exec {
executable 'hg'
args 'qpop', '-a'
+ ignoreExitValue = true
}
exec {
executable 'hg'
// Version 0
public static class A {
+ public int field;
+ public A(int value) {
+ field = value;
+ }
+
public int method() {
return 1;
}
// Version 1
public static class A___1 {
+ public int field;
+ public A___1(int value) {
+ field = value * 10;
+ }
+
public int method() {
return 2;
}
MethodHandles.Lookup lookup = MethodHandles.lookup();
MethodHandle handle = lookup.findVirtual(A.class, "method", MethodType.methodType(int.class));
- A a = new A();
+ A a = new A(3);
assertEquals(1, (int) handle.invokeExact(a));
__toVersion__(1);
MethodHandles.Lookup lookup = MethodHandles.lookup();
MethodHandle handle = lookup.findVirtual(A.class, "method", MethodType.methodType(int.class));
- A a = new A();
+ A a = new A(3);
MethodHandle boundHandle = handle.bindTo(a);
assertEquals(1, (int) boundHandle.invokeExact());
assert __version__() == 0;
}
+ @Test
+ public void testConstructorMethodHandleUpdated() throws Throwable {
+
+ assert __version__() == 0;
+
+ MethodHandles.Lookup lookup = MethodHandles.lookup();
+ MethodHandle handle = lookup.findConstructor(A.class, MethodType.methodType(void.class, int.class));
+
+ assertEquals(12, ((A) handle.invoke(12)).field);
+
+ __toVersion__(1);
+
+ assertEquals(120, ((A) handle.invoke(12)).field);
+
+ __toVersion__(0);
+ assert __version__() == 0;
+ }
+
@Test
public void testComplexMethodHandleUpdated() throws Throwable {
MethodHandle filter = lookup.findVirtual(A.class, "filter", MethodType.methodType(int.class, int.class));
MethodHandle staticFilter = lookup.findStatic(A.class, "staticFilter", MethodType.methodType(int.class, int.class));
- A a = new A();
+ A a = new A(3);
MethodHandle boundFilter = filter.bindTo(a);
handle = MethodHandles.filterReturnValue(handle, staticFilter);
handle = MethodHandles.filterReturnValue(handle, boundFilter);
#hotspotTag=jdk7u55-b13
#hotspotTag=jdk7u60-b09
#hotspotTag=jdk7u71-b01
-#hotspotTag=jdk7u79-b02
+#hotspotTag=jdk7u79-b15
#hotspotTag=jdk8u31-b13
#hotspotTag=jdk8u20-b22
+++ /dev/null
-diff --git a/make/bsd/makefiles/gcc.make b/make/bsd/makefiles/gcc.make
-index 3de1dea..8bf7f94 100644
---- a/make/bsd/makefiles/gcc.make
-+++ b/make/bsd/makefiles/gcc.make
-@@ -117,7 +117,10 @@
- CFLAGS += -fno-rtti
- CFLAGS += -fno-exceptions
- CFLAGS += -pthread
--CFLAGS += -fcheck-new
-+## well, strictly speaking we should check for clang not Darwin
-+ifneq ($(OS_VENDOR), Darwin)
-+ CFLAGS += -fcheck-new
-+endif
- # version 4 and above support fvisibility=hidden (matches jni_x86.h file)
- # except 4.1.2 gives pointless warnings that can't be disabled (afaik)
- ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
-diff --git a/src/cpu/x86/vm/templateTable_x86_32.cpp b/src/cpu/x86/vm/templateTable_x86_32.cpp
-index fc19edc..d2cddd3 100644
---- a/src/cpu/x86/vm/templateTable_x86_32.cpp
-+++ b/src/cpu/x86/vm/templateTable_x86_32.cpp
-@@ -2109,6 +2109,22 @@
- // resolve first time through
- address entry;
- switch (bytecode()) {
-+ case Bytecodes::_fast_agetfield : // fall through
-+ case Bytecodes::_fast_bgetfield : // fall through
-+ case Bytecodes::_fast_cgetfield : // fall through
-+ case Bytecodes::_fast_dgetfield : // fall through
-+ case Bytecodes::_fast_fgetfield : // fall through
-+ case Bytecodes::_fast_igetfield : // fall through
-+ case Bytecodes::_fast_lgetfield : // fall through
-+ case Bytecodes::_fast_sgetfield : // fall through
-+ case Bytecodes::_fast_aputfield : // fall through
-+ case Bytecodes::_fast_bputfield : // fall through
-+ case Bytecodes::_fast_cputfield : // fall through
-+ case Bytecodes::_fast_dputfield : // fall through
-+ case Bytecodes::_fast_fputfield : // fall through
-+ case Bytecodes::_fast_iputfield : // fall through
-+ case Bytecodes::_fast_lputfield : // fall through
-+ case Bytecodes::_fast_sputfield : // fall through
- case Bytecodes::_getstatic : // fall through
- case Bytecodes::_putstatic : // fall through
- case Bytecodes::_getfield : // fall through
-@@ -2211,6 +2227,7 @@
- // Correct values of the cache and index registers are preserved.
- void TemplateTable::jvmti_post_field_access(Register cache,
- Register index,
-+ int byte_no,
- bool is_static,
- bool has_tos) {
- if (JvmtiExport::can_post_field_access()) {
-@@ -2237,7 +2254,11 @@
- // cache: cache entry pointer
- __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_field_access),
- rax, cache);
-- __ get_cache_and_index_at_bcp(cache, index, 1);
-+
-+ // DCEVM: Redefinition might have occured => reresolve the cp entry.
-+ __ restore_bcp();
-+ resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
-+
- __ bind(L1);
- }
- }
-@@ -2258,7 +2279,7 @@
- const Register flags = rax;
-
- resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
-- jvmti_post_field_access(cache, index, is_static, false);
-+ jvmti_post_field_access(cache, index, byte_no, is_static, false);
- load_field_cp_cache_entry(obj, cache, index, off, flags, is_static);
-
- if (!is_static) pop_and_check_object(obj);
-@@ -2393,7 +2414,7 @@
-
- // The registers cache and index expected to be set before call.
- // The function may destroy various registers, just not the cache and index registers.
--void TemplateTable::jvmti_post_field_mod(Register cache, Register index, bool is_static) {
-+void TemplateTable::jvmti_post_field_mod(Register cache, Register index, int byte_no, bool is_static) {
-
- ByteSize cp_base_offset = constantPoolCacheOopDesc::base_offset();
-
-@@ -2451,7 +2472,11 @@
- // rcx: jvalue object on the stack
- __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_field_modification),
- rbx, rax, rcx);
-- __ get_cache_and_index_at_bcp(cache, index, 1);
-+
-+ // (tw) Redefinition might have occured => reresolve the cp entry.
-+ __ restore_bcp();
-+ resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
-+
- __ bind(L1);
- }
- }
-@@ -2467,7 +2492,7 @@
- const Register flags = rax;
-
- resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
-- jvmti_post_field_mod(cache, index, is_static);
-+ jvmti_post_field_mod(cache, index, byte_no, is_static);
- load_field_cp_cache_entry(obj, cache, index, off, flags, is_static);
-
- // Doug Lea believes this is not needed with current Sparcs (TSO) and Intel (PSO).
-@@ -2818,6 +2843,11 @@
- // rcx: cache entry pointer
- __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_field_access), rax, rcx);
- __ pop_ptr(rax); // restore object pointer
-+
-+ // DCEVM: Redefinition might have occured => reresolve the cp entry.
-+ __ restore_bcp();
-+ resolve_cache_and_index(1, noreg, rax, rcx, sizeof(u2));
-+
- __ bind(L1);
- }
-
-@@ -3008,6 +3038,26 @@
-
- __ bind(notFinal);
-
-+ // DCEVM: Check if we are calling an old method (and have to go slow path)
-+ Label notOld;
-+ __ movl(rax, flags);
-+ __ andl(rax, (1 << ConstantPoolCacheEntry::is_old_method_shift));
-+ __ jcc(Assembler::zero, notOld);
-+
-+ // Need a null check here!
-+ __ null_check(recv);
-+
-+ // Call out to VM to do look up based on correct vTable version (has to iterate back over the class history of the receiver class)
-+ // DCEVM: TODO: Check if we can improve performance by inlining.
-+ // DCEVM: TODO: Check if this additional branch affects normal execution time.
-+ __ call_VM(method, CAST_FROM_FN_PTR(address, InterpreterRuntime::find_correct_method), recv, index);
-+
-+ // profile this call
-+ __ profile_final_call(rax);
-+ __ jump_from_interpreted(method, rdx);
-+
-+ __ bind(notOld);
-+
- // get receiver klass
- __ null_check(recv, oopDesc::klass_offset_in_bytes());
- __ load_klass(rax, recv);
-@@ -3093,6 +3143,31 @@
- invokevirtual_helper(rbx, rcx, rdx);
- __ bind(notMethod);
-
-+ // DCEVM: Check if we are calling an old method (and have to go slow path)
-+ //__ movl(rax, rdx);
-+ Label notOld;
-+ __ andl(rdx, (1 << ConstantPoolCacheEntry::is_old_method_shift));
-+ __ jcc(Assembler::zero, notOld);
-+
-+ // Get receiver klass into rdx - also a null check
-+ __ movptr(rdx, Address(rcx, oopDesc::klass_offset_in_bytes()));
-+ __ verify_oop(rdx);
-+
-+ // Call out to VM to do look up based on correct vTable version (has to iterate back over the class history of the receiver class)
-+ // DCEVM: TODO: Check if we can improve performance by inlining.
-+ // DCEVM: TODO: Check if this additional branch affects normal execution time.
-+ // DCEVM: TODO: Check the exact semantic (with respect to destoying registers) of call_VM
-+ __ call_VM(rbx, CAST_FROM_FN_PTR(address, InterpreterRuntime::find_correct_interface_method), rcx, rax, rbx);
-+
-+ // DCEVM: TODO: Check if resolved method could be null.
-+
-+ // profile this call
-+ __ profile_virtual_call(rdx, rsi, rdi);
-+
-+ __ jump_from_interpreted(rbx, rdx);
-+
-+ __ bind(notOld);
-+
- // Get receiver klass into rdx - also a null check
- __ restore_locals(); // restore rdi
- __ null_check(rcx, oopDesc::klass_offset_in_bytes());
-diff --git a/src/cpu/x86/vm/templateTable_x86_64.cpp b/src/cpu/x86/vm/templateTable_x86_64.cpp
-index 932ee97..67bb710 100644
---- a/src/cpu/x86/vm/templateTable_x86_64.cpp
-+++ b/src/cpu/x86/vm/templateTable_x86_64.cpp
-@@ -2151,6 +2151,22 @@
- // resolve first time through
- address entry;
- switch (bytecode()) {
-+ case Bytecodes::_fast_agetfield : // fall through
-+ case Bytecodes::_fast_bgetfield : // fall through
-+ case Bytecodes::_fast_cgetfield : // fall through
-+ case Bytecodes::_fast_dgetfield : // fall through
-+ case Bytecodes::_fast_fgetfield : // fall through
-+ case Bytecodes::_fast_igetfield : // fall through
-+ case Bytecodes::_fast_lgetfield : // fall through
-+ case Bytecodes::_fast_sgetfield : // fall through
-+ case Bytecodes::_fast_aputfield : // fall through
-+ case Bytecodes::_fast_bputfield : // fall through
-+ case Bytecodes::_fast_cputfield : // fall through
-+ case Bytecodes::_fast_dputfield : // fall through
-+ case Bytecodes::_fast_fputfield : // fall through
-+ case Bytecodes::_fast_iputfield : // fall through
-+ case Bytecodes::_fast_lputfield : // fall through
-+ case Bytecodes::_fast_sputfield : // fall through
- case Bytecodes::_getstatic:
- case Bytecodes::_putstatic:
- case Bytecodes::_getfield:
-@@ -2267,7 +2283,7 @@
- // The registers cache and index expected to be set before call.
- // Correct values of the cache and index registers are preserved.
- void TemplateTable::jvmti_post_field_access(Register cache, Register index,
-- bool is_static, bool has_tos) {
-+ int byte_no, bool is_static, bool has_tos) {
- // do the JVMTI work here to avoid disturbing the register state below
- // We use c_rarg registers here because we want to use the register used in
- // the call to the VM
-@@ -2298,7 +2314,11 @@
- __ call_VM(noreg, CAST_FROM_FN_PTR(address,
- InterpreterRuntime::post_field_access),
- c_rarg1, c_rarg2, c_rarg3);
-- __ get_cache_and_index_at_bcp(cache, index, 1);
-+
-+ // DCEVM: Redefinition might have occured => reresolve the cp entry.
-+ __ restore_bcp();
-+ resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
-+
- __ bind(L1);
- }
- }
-@@ -2320,7 +2340,7 @@
- const Register bc = c_rarg3; // uses same reg as obj, so don't mix them
-
- resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
-- jvmti_post_field_access(cache, index, is_static, false);
-+ jvmti_post_field_access(cache, index, byte_no, is_static, false);
- load_field_cp_cache_entry(obj, cache, index, off, flags, is_static);
-
- if (!is_static) {
-@@ -2455,7 +2475,7 @@
-
- // The registers cache and index expected to be set before call.
- // The function may destroy various registers, just not the cache and index registers.
--void TemplateTable::jvmti_post_field_mod(Register cache, Register index, bool is_static) {
-+void TemplateTable::jvmti_post_field_mod(Register cache, Register index, int byte_no, bool is_static) {
- transition(vtos, vtos);
-
- ByteSize cp_base_offset = constantPoolCacheOopDesc::base_offset();
-@@ -2507,7 +2527,11 @@
- CAST_FROM_FN_PTR(address,
- InterpreterRuntime::post_field_modification),
- c_rarg1, c_rarg2, c_rarg3);
-- __ get_cache_and_index_at_bcp(cache, index, 1);
-+
-+ // DCEVM: Redefinition might have occured => reresolve the cp entry.
-+ __ restore_bcp();
-+ resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
-+
- __ bind(L1);
- }
- }
-@@ -2523,7 +2547,7 @@
- const Register bc = c_rarg3;
-
- resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
-- jvmti_post_field_mod(cache, index, is_static);
-+ jvmti_post_field_mod(cache, index, byte_no, is_static);
- load_field_cp_cache_entry(obj, cache, index, off, flags, is_static);
-
- // [jk] not needed currently
-@@ -2837,6 +2861,11 @@
- InterpreterRuntime::post_field_access),
- c_rarg1, c_rarg2);
- __ pop_ptr(rax); // restore object pointer
-+
-+ // DCEVM: Redefinition might have occured => reresolve the cp entry.
-+ __ restore_bcp();
-+ resolve_cache_and_index(1, noreg, rax, rcx, sizeof(u2));
-+
- __ bind(L1);
- }
-
-@@ -3073,6 +3102,26 @@
-
- __ bind(notFinal);
-
-+ // DCEVM: Check if we are calling an old method (and have to go slow path)
-+ Label notOld;
-+ __ movl(rax, flags);
-+ __ andl(rax, (1 << ConstantPoolCacheEntry::is_old_method_shift));
-+ __ jcc(Assembler::zero, notOld);
-+
-+ // Need a null check here!
-+ __ null_check(recv);
-+
-+ // Call out to VM to do look up based on correct vTable version (has to iterate back over the class history of the receiver class)
-+ // DCEVM: TODO: Check if we can improve performance by inlining.
-+ // DCEVM: TODO: Check if this additional branch affects normal execution time.
-+ __ call_VM(method, CAST_FROM_FN_PTR(address, InterpreterRuntime::find_correct_method), recv, index);
-+
-+ // profile this call
-+ __ profile_final_call(rax);
-+ __ jump_from_interpreted(method, rdx);
-+
-+ __ bind(notOld);
-+
- // get receiver klass
- __ null_check(recv, oopDesc::klass_offset_in_bytes());
- __ load_klass(rax, recv);
-@@ -3156,6 +3205,35 @@
- invokevirtual_helper(rbx, rcx, rdx);
- __ bind(notMethod);
-
-+ // DCEVM: Check if we are calling an old method (and have to go slow path)
-+ Label notOld;
-+ __ andl(rdx, (1 << ConstantPoolCacheEntry::is_old_method_shift));
-+ __ jcc(Assembler::zero, notOld);
-+
-+ // Call out to VM to do look up based on correct vTable version (has to iterate back over the class history of the receiver class)
-+ // DCEVM: TODO: Check if we can improve performance by inlining.
-+ // DCEVM: TODO: Check if this additional branch affects normal execution time.
-+ // DCEVM: TODO: Check the exact semantic (with respect to destoying registers) of call_VM
-+ // DCEVM: FIXME: What exactly should we store here?
-+ __ push(rcx); // destroyed by Linux arguments passing conventions
-+ __ movptr(r14, rcx);
-+ __ call_VM(rbx, CAST_FROM_FN_PTR(address, InterpreterRuntime::find_correct_interface_method), r14, rax, rbx);
-+ __ pop(rcx);
-+
-+ // Get receiver klass into rdx - also a null check
-+ __ restore_locals(); // restore r14
-+ __ load_klass(rdx, rcx);
-+ __ verify_oop(rdx);
-+
-+ // DCEVM: TODO: Check if resolved method could be null.
-+
-+ // profile this call
-+ __ profile_virtual_call(rdx, r13, r14);
-+
-+ __ jump_from_interpreted(rbx, rdx);
-+
-+ __ bind(notOld);
-+
- // Get receiver klass into rdx - also a null check
- __ restore_locals(); // restore r14
- __ null_check(rcx, oopDesc::klass_offset_in_bytes());
-diff --git a/src/share/vm/c1/c1_Compilation.hpp b/src/share/vm/c1/c1_Compilation.hpp
-index 9a8ca61..196ab25 100644
---- a/src/share/vm/c1/c1_Compilation.hpp
-+++ b/src/share/vm/c1/c1_Compilation.hpp
-@@ -242,8 +242,8 @@
- #define BAILOUT(msg) { bailout(msg); return; }
- #define BAILOUT_(msg, res) { bailout(msg); return res; }
-
--#define CHECK_BAILOUT() { if (bailed_out()) return; }
--#define CHECK_BAILOUT_(res) { if (bailed_out()) return res; }
-+#define CHECK_BAILOUT() { if (((CompilerThread *)Thread::current())->should_bailout()) bailout("Aborted externally"); if (bailed_out()) return; }
-+#define CHECK_BAILOUT_(res) { if (((CompilerThread *)Thread::current())->should_bailout()) bailout("Aborted externally"); if (bailed_out()) return res; }
-
-
- class InstructionMark: public StackObj {
-diff --git a/src/share/vm/ci/ciEnv.cpp b/src/share/vm/ci/ciEnv.cpp
-index e20db5d..57f37db 100644
---- a/src/share/vm/ci/ciEnv.cpp
-+++ b/src/share/vm/ci/ciEnv.cpp
-@@ -1172,3 +1172,11 @@
- // If memory is low, we stop compiling methods.
- record_method_not_compilable("out of memory");
- }
-+
-+// DCEVM: Called after class redefinition to clean up possibly invalidated state.
-+void ciEnv::cleanup_after_redefinition() {
-+
-+ if (_factory != NULL) {
-+ _factory->cleanup_after_redefinition();
-+ }
-+}
-diff --git a/src/share/vm/ci/ciEnv.hpp b/src/share/vm/ci/ciEnv.hpp
-index 103e532..abe2e37 100644
---- a/src/share/vm/ci/ciEnv.hpp
-+++ b/src/share/vm/ci/ciEnv.hpp
-@@ -417,6 +417,8 @@
- void record_failure(const char* reason);
- void record_method_not_compilable(const char* reason, bool all_tiers = true);
- void record_out_of_memory_failure();
-+
-+ void cleanup_after_redefinition();
- };
-
- #endif // SHARE_VM_CI_CIENV_HPP
-diff --git a/src/share/vm/ci/ciObjectFactory.cpp b/src/share/vm/ci/ciObjectFactory.cpp
-index e0ab96b..36efef4 100644
---- a/src/share/vm/ci/ciObjectFactory.cpp
-+++ b/src/share/vm/ci/ciObjectFactory.cpp
-@@ -296,6 +296,11 @@
- // into the table. We need to recompute our index.
- index = find(keyHandle(), _ci_objects);
- }
-+
-+ if (is_found_at(index, keyHandle(), _ci_objects)) {
-+ // DCEVM: Check if this is an error? Can occur when redefining classes.
-+ return _ci_objects->at(index);
-+ }
- assert(!is_found_at(index, keyHandle(), _ci_objects), "no double insert");
- insert(index, new_object, _ci_objects);
- return new_object;
-@@ -764,3 +769,50 @@
- _unloaded_instances->length(),
- _unloaded_klasses->length());
- }
-+
-+// DCEVM: Resoring the ciObject arrays after class redefinition
-+void ciObjectFactory::sort_ci_objects(GrowableArray<ciObject*>* objects) {
-+
-+ // Resort the _ci_objects array. The order of two class pointers can be changed during class redefinition.
-+ oop last = NULL;
-+ for (int j = 0; j< objects->length(); j++) {
-+ oop o = objects->at(j)->get_oop();
-+ if (last >= o) {
-+ int cur_last_index = j - 1;
-+ oop cur_last = last;
-+ while (cur_last >= o) {
-+
-+ // Swap the two objects to guarantee ordering
-+ ciObject *tmp = objects->at(cur_last_index);
-+ objects->at_put(cur_last_index, objects->at(cur_last_index + 1));
-+ objects->at_put(cur_last_index + 1, tmp);
-+
-+ // Decrement index to move one step to the left
-+ cur_last_index--;
-+ if (cur_last_index < 0) {
-+ break;
-+ }
-+ cur_last = objects->at(cur_last_index)->get_oop();
-+ }
-+ } else {
-+ assert(last < o, "out of order");
-+ last = o;
-+ }
-+ }
-+
-+#ifdef ASSERT
-+ if (CIObjectFactoryVerify) {
-+ oop last = NULL;
-+ for (int j = 0; j< objects->length(); j++) {
-+ oop o = objects->at(j)->get_oop();
-+ assert(last < o, "out of order");
-+ last = o;
-+ }
-+ }
-+#endif // ASSERT
-+}
-+
-+// DCEVM: Called after class redefinition to clean up possibly invalidated state.
-+void ciObjectFactory::cleanup_after_redefinition() {
-+ sort_ci_objects(_ci_objects);
-+}
-diff --git a/src/share/vm/ci/ciObjectFactory.hpp b/src/share/vm/ci/ciObjectFactory.hpp
-index 26cc2c3..855a4ac 100644
---- a/src/share/vm/ci/ciObjectFactory.hpp
-+++ b/src/share/vm/ci/ciObjectFactory.hpp
-@@ -38,6 +38,7 @@
- class ciObjectFactory : public ResourceObj {
- friend class VMStructs;
- friend class ciEnv;
-+ friend class CompileBroker;
-
- private:
- static volatile bool _initialized;
-@@ -137,6 +138,11 @@
-
- void print_contents();
- void print();
-+
-+private:
-+
-+ static void sort_ci_objects(GrowableArray<ciObject*>* objects);
-+ void cleanup_after_redefinition();
- };
-
- #endif // SHARE_VM_CI_CIOBJECTFACTORY_HPP
-diff --git a/src/share/vm/classfile/classFileParser.cpp b/src/share/vm/classfile/classFileParser.cpp
-index 505bad1..2912a66 100644
---- a/src/share/vm/classfile/classFileParser.cpp
-+++ b/src/share/vm/classfile/classFileParser.cpp
-@@ -795,6 +795,7 @@
- Handle class_loader,
- Handle protection_domain,
- Symbol* class_name,
-+ KlassHandle old_klass,
- TRAPS) {
- ClassFileStream* cfs = stream();
- assert(length > 0, "only called for length>0");
-@@ -813,6 +814,9 @@
- interface_index, CHECK_(nullHandle));
- if (cp->tag_at(interface_index).is_klass()) {
- interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
-+ if (!old_klass.is_null() && !interf->is_newest_version()) {
-+ interf = KlassHandle(THREAD, interf->newest_version());
-+ }
- } else {
- Symbol* unresolved_klass = cp->klass_name_at(interface_index);
-
-@@ -825,6 +829,9 @@
- klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
- unresolved_klass, class_loader, protection_domain,
- false, CHECK_(nullHandle));
-+ if (!old_klass.is_null()) {
-+ k = k->klass_part()->newest_version();
-+ }
- interf = KlassHandle(THREAD, k);
- }
-
-@@ -1923,6 +1930,8 @@
- int runtime_invisible_parameter_annotations_length = 0;
- u1* annotation_default = NULL;
- int annotation_default_length = 0;
-+ u2 code_section_table_length;
-+ typeArrayHandle code_section_table;
-
- // Parse code and exceptions attribute
- u2 method_attributes_count = cfs->get_u2_fast();
-@@ -2092,6 +2101,24 @@
- parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
- stackmap_data = typeArrayHandle(THREAD, sm);
- parsed_stackmap_attribute = true;
-+ } else if (UseMethodForwardPoints && cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_code_sections()) {
-+ int length = code_attribute_length;
-+ int value_count = length / sizeof(u2);
-+ int line_count = length / 3;
-+ if (TraceRedefineClasses >= 3) {
-+ tty->print_cr("Found code section attribute when loading class with %d entries", value_count, line_count);
-+ }
-+ code_section_table_length = value_count;
-+ code_section_table = oopFactory::new_permanent_shortArray(value_count, CHECK_NULL);
-+ code_section_table->set_length(value_count);
-+
-+ for (int i = 0; i < value_count; ++i) {
-+ u2 value = cfs->get_u2(CHECK_(nullHandle));
-+ code_section_table->short_at_put(i, value);
-+ if (TraceRedefineClasses >= 4) {
-+ tty->print_cr("Code section table at %d: %d", i, value);
-+ }
-+ }
- } else {
- // Skip unknown attributes
- cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
-@@ -2216,6 +2243,18 @@
- }
- #endif
-
-+ // DCEVM: TODO: Get a different solution for the problem of method forward
-+ // points and variable sized interpreter frames.
-+ if (UseMethodForwardPoints) {
-+ if (max_stack > MethodForwardPointsMaxStack) {
-+ fatal(err_msg("Method has too large stack (%d), increase the value of MethodForwardPointsMaxStack (%d)", max_stack, MethodForwardPointsMaxStack));
-+ }
-+ if (max_locals > MethodForwardPointsMaxLocals) {
-+ fatal(err_msg("Method has too many locals (%d), increase the value of MethodForwardPointsMaxLocals (%d)", max_stack, MethodForwardPointsMaxStack));
-+ }
-+ max_stack = MethodForwardPointsMaxStack;
-+ max_locals = MethodForwardPointsMaxLocals;
-+ }
- // Fill in code attribute information
- m->set_max_stack(max_stack);
- m->set_max_locals(max_locals);
-@@ -2228,6 +2267,8 @@
- * sure that the oops can pass verification when this field is set.
- */
- m->constMethod()->set_stackmap_data(stackmap_data());
-+
-+ m->constMethod()->set_code_section_table(code_section_table());
-
- // Copy byte codes
- m->set_code(code_start);
-@@ -2825,6 +2866,15 @@
- "Invalid Deprecated classfile attribute length %u in class file %s",
- attribute_length, CHECK);
- }
-+ } else if (tag == vmSymbols::tag_field_redefinition_policy()) {
-+ // DCEVM: Check for deleted field attribute
-+ _field_redefinition_policy = cfs->get_u1_fast();
-+ } else if (tag == vmSymbols::tag_static_field_redefinition_policy()) {
-+ // DCEVM: Check for deleted static field attribute
-+ _static_field_redefinition_policy = cfs->get_u1_fast();
-+ } else if (tag == vmSymbols::tag_method_redefinition_policy()) {
-+ // DCEVM: Check for deleted method attribute
-+ _method_redefinition_policy = cfs->get_u1_fast();
- } else if (_major_version >= JAVA_1_5_VERSION) {
- if (tag == vmSymbols::tag_signature()) {
- if (attribute_length != 2) {
-@@ -2929,6 +2979,17 @@
- }
- k->set_inner_classes(_inner_classes());
- k->set_class_annotations(_annotations());
-+
-+
-+ if (_field_redefinition_policy != 0xff) {
-+ k->set_field_redefinition_policy(_field_redefinition_policy);
-+ }
-+ if (_static_field_redefinition_policy != 0xff) {
-+ k->set_static_field_redefinition_policy(_static_field_redefinition_policy);
-+ }
-+ if (_method_redefinition_policy != 0xff) {
-+ k->set_method_redefinition_policy(_method_redefinition_policy);
-+ }
- }
-
- typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
-@@ -2952,9 +3013,126 @@
- }
-
-
-+// DCEVM: Finds the super symbols by reading the bytes of the class and returns
-+// them in a growable array.
-+void ClassFileParser::findSuperSymbols(Symbol* name,
-+ Handle class_loader,
-+ Handle protection_domain,
-+ KlassHandle old_klass,
-+ GrowableArray<Symbol*> &handles,
-+ TRAPS) {
-+
-+ _cp_patches = NULL;
-+ // So that JVMTI can cache class file in the state before retransformable agents
-+ // have modified it
-+ unsigned char *cached_class_file_bytes = NULL;
-+
-+ ClassFileStream* cfs = stream();
-+
-+ _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
-+
-+ instanceKlassHandle nullHandle;
-+
-+ // Save the class file name for easier error message printing.
-+ _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
-+
-+ cfs->guarantee_more(8, CHECK); // magic, major, minor
-+ // Magic value
-+ u4 magic = cfs->get_u4_fast();
-+ if (magic != JAVA_CLASSFILE_MAGIC) {
-+ // Invalid class file!
-+ return;
-+ }
-+
-+ // Version numbers
-+ u2 minor_version = cfs->get_u2_fast();
-+ u2 major_version = cfs->get_u2_fast();
-+
-+ // Check version numbers - we check this even with verifier off
-+ if (!is_supported_version(major_version, minor_version)) {
-+
-+ // Unsupported version!
-+ return;
-+ }
-+
-+ _major_version = major_version;
-+ _minor_version = minor_version;
-+
-+
-+ // Check if verification needs to be relaxed for this class file
-+ // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
-+ _relax_verify = Verifier::relax_verify_for(class_loader());
-+ _need_verify = false;
-+
-+ // Constant pool
-+ constantPoolHandle cp = parse_constant_pool(class_loader(), CHECK);
-+ int cp_size = cp->length();
-+
-+ cfs->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
-+
-+ // Access flags
-+ AccessFlags access_flags;
-+ jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
-+
-+ if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
-+ // Set abstract bit for old class files for backward compatibility
-+ flags |= JVM_ACC_ABSTRACT;
-+ }
-+ access_flags.set_flags(flags);
-+
-+ // This class and superclass
-+ instanceKlassHandle super_klass;
-+ u2 this_class_index = cfs->get_u2_fast();
-+ check_property(
-+ valid_cp_range(this_class_index, cp_size) &&
-+ cp->tag_at(this_class_index).is_unresolved_klass(),
-+ "Invalid this class index %u in constant pool in class file %s",
-+ this_class_index, CHECK);
-+
-+ Symbol* class_name = cp->unresolved_klass_at(this_class_index);
-+ assert(class_name != NULL, "class_name can't be null");
-+
-+ // Update _class_name which could be null previously to be class_name
-+ _class_name = class_name;
-+
-+ // DCEVM: DO NOT release all handles when parsing is done
-+ {// HandleMark hm(THREAD);
-+
-+ // Checks if name in class file matches requested name
-+ if (name != NULL && class_name != name) {
-+ return;
-+ }
-+
-+ u2 super_class_index = cfs->get_u2_fast();
-+
-+ if (super_class_index != 0) {
-+ Symbol* super_class = cp->klass_name_at(super_class_index);
-+ handles.append(super_class);
-+ } else {
-+ // DCEVM: This redefinition must be for the Object class.
-+ }
-+
-+ // Interfaces
-+ u2 itfs_len = cfs->get_u2_fast();
-+ objArrayHandle local_interfaces;
-+ if (itfs_len == 0) {
-+ local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
-+ } else {
-+ local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, old_klass, CHECK);
-+ }
-+
-+ for (int i=0; i<local_interfaces->length(); i++) {
-+ oop o = local_interfaces->obj_at(i);
-+ Symbol* interface_handle = ((klassOop)o)->klass_part()->name();
-+ handles.append(interface_handle);
-+ }
-+ }
-+}
-+
- instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
- Handle class_loader,
- Handle protection_domain,
-+ KlassHandle old_klass,
- KlassHandle host_klass,
- GrowableArray<Handle>* cp_patches,
- TempNewSymbol& parsed_name,
-@@ -3005,10 +3183,13 @@
- unsigned char* ptr = cfs->buffer();
- unsigned char* end_ptr = cfs->buffer() + cfs->length();
-
-+ bool pretend_new_universe = Thread::current()->pretend_new_universe();
-+ Thread::current()->set_pretend_new_universe(false);
- JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
- &ptr, &end_ptr,
- &cached_class_file_bytes,
- &cached_class_file_length);
-+ Thread::current()->set_pretend_new_universe(pretend_new_universe);
-
- if (ptr != cfs->buffer()) {
- // JVMTI agent has modified class file data.
-@@ -3164,7 +3345,11 @@
- // However, make sure it is not an array type.
- bool is_array = false;
- if (cp->tag_at(super_class_index).is_klass()) {
-- super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
-+ klassOop resolved_klass = cp->resolved_klass_at(super_class_index);
-+ if (!old_klass.is_null()) {
-+ resolved_klass = resolved_klass->klass_part()->newest_version();
-+ }
-+ super_klass = instanceKlassHandle(THREAD, resolved_klass);
- if (_need_verify)
- is_array = super_klass->oop_is_array();
- } else if (_need_verify) {
-@@ -3182,7 +3367,7 @@
- if (itfs_len == 0) {
- local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
- } else {
-- local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
-+ local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, old_klass, CHECK_(nullHandle));
- }
-
- u2 java_fields_count = 0;
-@@ -3237,7 +3422,9 @@
- protection_domain,
- true,
- CHECK_(nullHandle));
--
-+ if (!old_klass.is_null()) {
-+ k = k->klass_part()->newest_version();
-+ }
- KlassHandle kh (THREAD, k);
- super_klass = instanceKlassHandle(THREAD, kh());
- }
-@@ -3626,6 +3813,19 @@
- rt = REF_NONE;
- } else {
- rt = super_klass->reference_type();
-+
-+ // DCEVM: With class redefinition, it can also happen that special classes are loaded.
-+ if (name == vmSymbols::java_lang_ref_Reference()) {
-+ rt = REF_OTHER;
-+ } else if (name == vmSymbols::java_lang_ref_SoftReference()) {
-+ rt = REF_SOFT;
-+ } else if (name == vmSymbols::java_lang_ref_WeakReference()) {
-+ rt = REF_WEAK;
-+ } else if (name == vmSymbols::java_lang_ref_FinalReference()) {
-+ rt = REF_FINAL;
-+ } else if (name == vmSymbols::java_lang_ref_PhantomReference()) {
-+ rt = REF_PHANTOM;
-+ }
- }
-
- // We can now create the basic klassOop for this klass
-@@ -3726,7 +3926,7 @@
- fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
-
- // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
-- set_precomputed_flags(this_klass);
-+ set_precomputed_flags(this_klass, old_klass);
-
- // reinitialize modifiers, using the InnerClasses attribute
- int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
-@@ -3748,6 +3948,10 @@
-
- // Allocate mirror and initialize static fields
- java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
-+
-+ if (rt == REF_OTHER) {
-+ instanceRefKlass::update_nonstatic_oop_maps(ik);
-+ }
-
- ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
- false /* not shared class */);
-@@ -3891,7 +4095,7 @@
- }
-
-
--void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
-+void ClassFileParser::set_precomputed_flags(instanceKlassHandle k, KlassHandle old_klass) {
- klassOop super = k->super();
-
- // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
-@@ -3899,7 +4103,9 @@
- if (!_has_empty_finalizer) {
- if (_has_finalizer ||
- (super != NULL && super->klass_part()->has_finalizer())) {
-- k->set_has_finalizer();
-+ if (old_klass.is_null() || old_klass->has_finalizer()) {
-+ k->set_has_finalizer();
-+ }
- }
- }
-
-@@ -3915,7 +4121,7 @@
-
- // Check if this klass supports the java.lang.Cloneable interface
- if (SystemDictionary::Cloneable_klass_loaded()) {
-- if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
-+ if (k->is_subtype_of(SystemDictionary::Cloneable_klass()) || k->is_subtype_of(SystemDictionary::Cloneable_klass()->klass_part()->newest_version())) {
- k->set_is_cloneable();
- }
- }
-diff --git a/src/share/vm/classfile/classFileParser.hpp b/src/share/vm/classfile/classFileParser.hpp
-index a95a784..ac217fc 100644
---- a/src/share/vm/classfile/classFileParser.hpp
-+++ b/src/share/vm/classfile/classFileParser.hpp
-@@ -64,6 +64,9 @@
- int _sde_length;
- typeArrayHandle _inner_classes;
- typeArrayHandle _annotations;
-+ u1 _field_redefinition_policy;
-+ u1 _static_field_redefinition_policy;
-+ u1 _method_redefinition_policy;
-
- void set_class_synthetic_flag(bool x) { _synthetic_flag = x; }
- void set_class_sourcefile(Symbol* x) { _sourcefile = x; }
-@@ -151,6 +154,7 @@
- Handle class_loader,
- Handle protection_domain,
- Symbol* class_name,
-+ KlassHandle old_klass,
- TRAPS);
-
- // Field parsing
-@@ -239,7 +243,7 @@
- unsigned int nonstatic_oop_map_count,
- int* nonstatic_oop_offsets,
- unsigned int* nonstatic_oop_counts);
-- void set_precomputed_flags(instanceKlassHandle k);
-+ void set_precomputed_flags(instanceKlassHandle k, KlassHandle old_klass);
- objArrayHandle compute_transitive_interfaces(instanceKlassHandle super,
- objArrayHandle local_ifs, TRAPS);
-
-@@ -345,7 +349,12 @@
-
- public:
- // Constructor
-- ClassFileParser(ClassFileStream* st) { set_stream(st); }
-+ ClassFileParser(ClassFileStream* st) {
-+ set_stream(st);
-+ _field_redefinition_policy = 0xff;
-+ _static_field_redefinition_policy = 0xff;
-+ _method_redefinition_policy = 0xff;
-+ }
-
- // Parse .class file and return new klassOop. The klassOop is not hooked up
- // to the system dictionary or any other structures, so a .class file can
-@@ -357,21 +366,33 @@
- instanceKlassHandle parseClassFile(Symbol* name,
- Handle class_loader,
- Handle protection_domain,
-+ KlassHandle old_klass,
- TempNewSymbol& parsed_name,
- bool verify,
- TRAPS) {
- KlassHandle no_host_klass;
-- return parseClassFile(name, class_loader, protection_domain, no_host_klass, NULL, parsed_name, verify, THREAD);
-+ return parseClassFile(name, class_loader, protection_domain, old_klass, no_host_klass, NULL, parsed_name, verify, THREAD);
- }
- instanceKlassHandle parseClassFile(Symbol* name,
- Handle class_loader,
- Handle protection_domain,
-+ KlassHandle old_klass,
- KlassHandle host_klass,
- GrowableArray<Handle>* cp_patches,
- TempNewSymbol& parsed_name,
- bool verify,
- TRAPS);
-
-+ static void initialize_static_field(fieldDescriptor* fd, TRAPS);
-+
-+ // DCEVM: Creates symbol handles for the super class and the interfaces
-+ void findSuperSymbols(Symbol* name,
-+ Handle class_loader,
-+ Handle protection_domain,
-+ KlassHandle old_klass,
-+ GrowableArray<Symbol*> &handles,
-+ TRAPS);
-+
- // Verifier checks
- static void check_super_class_access(instanceKlassHandle this_klass, TRAPS);
- static void check_super_interface_access(instanceKlassHandle this_klass, TRAPS);
-diff --git a/src/share/vm/classfile/classLoader.cpp b/src/share/vm/classfile/classLoader.cpp
-index a2e61a4..450e19f 100644
---- a/src/share/vm/classfile/classLoader.cpp
-+++ b/src/share/vm/classfile/classLoader.cpp
-@@ -915,6 +915,7 @@
- instanceKlassHandle result = parser.parseClassFile(h_name,
- class_loader,
- protection_domain,
-+ KlassHandle(),
- parsed_name,
- false,
- CHECK_(h));
-diff --git a/src/share/vm/classfile/dictionary.cpp b/src/share/vm/classfile/dictionary.cpp
-index 78e76cc..ee21f3a 100644
---- a/src/share/vm/classfile/dictionary.cpp
-+++ b/src/share/vm/classfile/dictionary.cpp
-@@ -326,6 +326,21 @@
- }
- }
-
-+
-+// DCEVM: Just the classes from defining class loaders
-+void Dictionary::classes_do(ObjectClosure *closure) {
-+ for (int index = 0; index < table_size(); index++) {
-+ for (DictionaryEntry* probe = bucket(index);
-+ probe != NULL;
-+ probe = probe->next()) {
-+ klassOop k = probe->klass();
-+ if (probe->loader() == instanceKlass::cast(k)->class_loader()) {
-+ closure->do_object(k);
-+ }
-+ }
-+ }
-+}
-+
- // Added for initialize_itable_for_klass to handle exceptions
- // Just the classes from defining class loaders
- void Dictionary::classes_do(void f(klassOop, TRAPS), TRAPS) {
-@@ -433,6 +448,33 @@
- add_entry(index, entry);
- }
-
-+// DCEVM: Updates the klass entry to point to the new klassOop. Necessary only for class redefinition.
-+bool Dictionary::update_klass(int index, unsigned int hash, Symbol* name, Handle loader, KlassHandle k, KlassHandle old_class) {
-+
-+ // There are several entries for the same class in the dictionary: One extra entry for each parent classloader of the classloader of the class.
-+ bool found = false;
-+ for (int index = 0; index < table_size(); index++) {
-+ for (DictionaryEntry* entry = bucket(index); entry != NULL; entry = entry->next()) {
-+ if (entry->klass() == old_class()) {
-+ entry->set_literal(k());
-+ found = true;
-+ }
-+ }
-+ }
-+
-+ return found;
-+}
-+
-+// DCEVM: Undo previous updates to the system dictionary
-+void Dictionary::rollback_redefinition() {
-+ for (int index = 0; index < table_size(); index++) {
-+ for (DictionaryEntry* entry = bucket(index); entry != NULL; entry = entry->next()) {
-+ if (entry->klass()->klass_part()->is_redefining()) {
-+ entry->set_literal(entry->klass()->klass_part()->old_version());
-+ }
-+ }
-+ }
-+}
-
- // This routine does not lock the system dictionary.
- //
-@@ -459,12 +501,22 @@
- return NULL;
- }
-
-+// DCEVM: return old version if we are not in the new universe?
-+klassOop Dictionary::intercept_for_version(klassOop k) {
-+ if (k == NULL) return k;
-+
-+ if (k->klass_part()->is_redefining() && !Thread::current()->pretend_new_universe()) {
-+ return k->klass_part()->old_version();
-+ }
-+
-+ return k;
-+}
-
- klassOop Dictionary::find(int index, unsigned int hash, Symbol* name,
- Handle loader, Handle protection_domain, TRAPS) {
- DictionaryEntry* entry = get_entry(index, hash, name, loader);
- if (entry != NULL && entry->is_valid_protection_domain(protection_domain)) {
-- return entry->klass();
-+ return intercept_for_version(entry->klass());
- } else {
- return NULL;
- }
-@@ -477,7 +529,7 @@
- assert (index == index_for(name, loader), "incorrect index?");
-
- DictionaryEntry* entry = get_entry(index, hash, name, loader);
-- return (entry != NULL) ? entry->klass() : (klassOop)NULL;
-+ return intercept_for_version((entry != NULL) ? entry->klass() : (klassOop)NULL);
- }
-
-
-@@ -489,7 +541,7 @@
- assert (index == index_for(name, Handle()), "incorrect index?");
-
- DictionaryEntry* entry = get_entry(index, hash, name, Handle());
-- return (entry != NULL) ? entry->klass() : (klassOop)NULL;
-+ return intercept_for_version((entry != NULL) ? entry->klass() : (klassOop)NULL);
- }
-
-
-diff --git a/src/share/vm/classfile/dictionary.hpp b/src/share/vm/classfile/dictionary.hpp
-index bd33760..186d0eb 100644
---- a/src/share/vm/classfile/dictionary.hpp
-+++ b/src/share/vm/classfile/dictionary.hpp
-@@ -73,6 +73,10 @@
-
- void add_klass(Symbol* class_name, Handle class_loader,KlassHandle obj);
-
-+ bool update_klass(int index, unsigned int hash, Symbol* name, Handle loader, KlassHandle k, KlassHandle old_class);
-+
-+ void rollback_redefinition();
-+
- klassOop find_class(int index, unsigned int hash,
- Symbol* name, Handle loader);
-
-@@ -89,6 +93,7 @@
- void classes_do(void f(klassOop, TRAPS), TRAPS);
- void classes_do(void f(klassOop, oop));
- void classes_do(void f(klassOop, oop, TRAPS), TRAPS);
-+ void classes_do(ObjectClosure *closure);
-
- void methods_do(void f(methodOop));
-
-@@ -105,6 +110,7 @@
- bool do_unloading(BoolObjectClosure* is_alive);
-
- // Protection domains
-+ static klassOop intercept_for_version(klassOop k);
- klassOop find(int index, unsigned int hash, Symbol* name,
- Handle loader, Handle protection_domain, TRAPS);
- bool is_valid_protection_domain(int index, unsigned int hash,
-diff --git a/src/share/vm/classfile/javaClasses.cpp b/src/share/vm/classfile/javaClasses.cpp
-index 7dd5f1b..9c7d8eb 100644
---- a/src/share/vm/classfile/javaClasses.cpp
-+++ b/src/share/vm/classfile/javaClasses.cpp
-@@ -1798,7 +1798,7 @@
- klassOop klass = SystemDictionary::reflect_Method_klass();
- // This class is eagerly initialized during VM initialization, since we keep a refence
- // to one of the methods
-- assert(instanceKlass::cast(klass)->is_initialized(), "must be initialized");
-+ assert(instanceKlass::cast(klass)->is_initialized() || klass->klass_part()->old_version() != NULL, "must be initialized");
- return instanceKlass::cast(klass)->allocate_instance_handle(CHECK_NH);
- }
-
-diff --git a/src/share/vm/classfile/javaClasses.hpp b/src/share/vm/classfile/javaClasses.hpp
-index 36d1cec..a6de98e 100644
---- a/src/share/vm/classfile/javaClasses.hpp
-+++ b/src/share/vm/classfile/javaClasses.hpp
-@@ -213,7 +213,6 @@
-
- class java_lang_Class : AllStatic {
- friend class VMStructs;
--
- private:
- // The fake offsets are added by the class loader when java.lang.Class is loaded
-
-diff --git a/src/share/vm/classfile/loaderConstraints.cpp b/src/share/vm/classfile/loaderConstraints.cpp
-index 8650cd9..965cce2 100644
---- a/src/share/vm/classfile/loaderConstraints.cpp
-+++ b/src/share/vm/classfile/loaderConstraints.cpp
-@@ -449,7 +449,7 @@
- if (k != NULL) {
- // We found the class in the system dictionary, so we should
- // make sure that the klassOop matches what we already have.
-- guarantee(k == probe->klass(), "klass should be in dictionary");
-+ guarantee(k == probe->klass()->klass_part()->newest_version(), "klass should be in dictionary");
- } else {
- // If we don't find the class in the system dictionary, it
- // has to be in the placeholders table.
-diff --git a/src/share/vm/classfile/loaderConstraints.hpp b/src/share/vm/classfile/loaderConstraints.hpp
-index d01b2c4..1ad80f7 100644
---- a/src/share/vm/classfile/loaderConstraints.hpp
-+++ b/src/share/vm/classfile/loaderConstraints.hpp
-@@ -106,7 +106,7 @@
-
- klassOop klass() { return literal(); }
- klassOop* klass_addr() { return literal_addr(); }
-- void set_klass(klassOop k) { set_literal(k); }
-+ void set_klass(klassOop k) { set_literal(k); assert(k == NULL || !k->klass_part()->is_redefining(), "just checking"); }
-
- LoaderConstraintEntry* next() {
- return (LoaderConstraintEntry*)HashtableEntry<klassOop, mtClass>::next();
-diff --git a/src/share/vm/classfile/systemDictionary.cpp b/src/share/vm/classfile/systemDictionary.cpp
-index 2fa221b..8e45161 100644
---- a/src/share/vm/classfile/systemDictionary.cpp
-+++ b/src/share/vm/classfile/systemDictionary.cpp
-@@ -157,6 +157,7 @@
- // can return a null klass
- klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD);
- }
-+ assert(klass == NULL || klass->klass_part()->is_newest_version() || klass->klass_part()->newest_version()->klass_part()->is_redefining(), "must be");
- return klass;
- }
-
-@@ -199,7 +200,8 @@
- // Forwards to resolve_instance_class_or_null
-
- klassOop SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) {
-- assert(!THREAD->is_Compiler_thread(),
-+ // DCEVM: Check if this relaxing of the condition is correct? Test case hs203t004 failing otherwise.
-+ assert(!THREAD->is_Compiler_thread() || JvmtiThreadState::state_for(JavaThread::current())->get_class_being_redefined() != NULL,
- err_msg("can not load classes with compiler thread: class=%s, classloader=%s",
- class_name->as_C_string(),
- class_loader.is_null() ? "null" : class_loader->klass()->klass_part()->name()->as_C_string()));
-@@ -961,6 +963,7 @@
- instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name,
- class_loader,
- protection_domain,
-+ KlassHandle(),
- host_klass,
- cp_patches,
- parsed_name,
-@@ -1022,7 +1025,14 @@
- Handle protection_domain,
- ClassFileStream* st,
- bool verify,
-+ KlassHandle old_class,
- TRAPS) {
-+ bool redefine_classes_locked = false;
-+ if (!Thread::current()->redefine_classes_mutex()->owned_by_self()) {
-+ Thread::current()->redefine_classes_mutex()->lock();
-+ redefine_classes_locked = true;
-+ }
-+
- // Classloaders that support parallelism, e.g. bootstrap classloader,
- // or all classloaders with UnsyncloadClass do not acquire lock here
- bool DoObjectLock = true;
-@@ -1050,9 +1060,14 @@
- instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name,
- class_loader,
- protection_domain,
-+ old_class,
- parsed_name,
- verify,
- THREAD);
-+ if (!old_class.is_null() && !k.is_null()) {
-+ k->set_redefining(true);
-+ k->set_old_version(old_class());
-+ }
-
- const char* pkg = "java/";
- if (!HAS_PENDING_EXCEPTION &&
-@@ -1087,11 +1102,16 @@
- // Add class just loaded
- // If a class loader supports parallel classloading handle parallel define requests
- // find_or_define_instance_class may return a different instanceKlass
-- if (is_parallelCapable(class_loader)) {
-+ // (tw) TODO: for class redefinition the parallel version does not work, check if this is a problem?
-+ if (is_parallelCapable(class_loader) && old_class.is_null()) {
- k = find_or_define_instance_class(class_name, class_loader, k, THREAD);
- } else {
-- define_instance_class(k, THREAD);
-+ define_instance_class(k, old_class, THREAD);
- }
-+ }
-+
-+ if (redefine_classes_locked) {
-+ Thread::current()->redefine_classes_mutex()->unlock();
- }
-
- // If parsing the class file or define_instance_class failed, we
-@@ -1122,7 +1142,7 @@
- MutexLocker mu(SystemDictionary_lock, THREAD);
-
- klassOop check = find_class(parsed_name, class_loader);
-- assert(check == k(), "should be present in the dictionary");
-+ assert((check == k() && !k->is_redefining()) || (k->is_redefining() && check == k->old_version()), "should be present in the dictionary");
-
- klassOop check2 = find_class(h_name, h_loader);
- assert(check == check2, "name inconsistancy in SystemDictionary");
-@@ -1349,7 +1369,11 @@
- }
- }
-
--void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) {
-+void SystemDictionary::rollback_redefinition() {
-+ dictionary()->rollback_redefinition();
-+}
-+
-+void SystemDictionary::define_instance_class(instanceKlassHandle k, KlassHandle old_class, TRAPS) {
-
- Handle class_loader_h(THREAD, k->class_loader());
-
-@@ -1376,13 +1400,23 @@
- Symbol* name_h = k->name();
- unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader_h);
- int d_index = dictionary()->hash_to_index(d_hash);
-- check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK);
-+
-+ // DCEVM: Update version of the klassOop in the system dictionary
-+ // TODO: Check for thread safety!
-+ if (!old_class.is_null()) {
-+ bool ok = dictionary()->update_klass(d_index, d_hash, name_h, class_loader_h, k, old_class);
-+ assert (ok, "must have found old class and updated!");
-+ }
-+ check_constraints(d_index, d_hash, k, class_loader_h, old_class.is_null(), CHECK);
-+
-+ if(!old_class.is_null() && TraceRedefineClasses >= 3){ tty->print_cr("Class has been updated!"); }
-
- // Register class just loaded with class loader (placed in Vector)
- // Note we do this before updating the dictionary, as this can
- // fail with an OutOfMemoryError (if it does, we will *not* put this
- // class in the dictionary and will not update the class hierarchy).
-- if (k->class_loader() != NULL) {
-+ // (tw) Only register if not redefining a class.
-+ if (k->class_loader() != NULL && old_class.is_null()) {
- methodHandle m(THREAD, Universe::loader_addClass_method());
- JavaValue result(T_VOID);
- JavaCallArguments args(class_loader_h);
-@@ -1408,8 +1442,9 @@
- }
- k->eager_initialize(THREAD);
-
-+ // (tw) Only notify jvmti if not redefining a class.
- // notify jvmti
-- if (JvmtiExport::should_post_class_load()) {
-+ if (JvmtiExport::should_post_class_load() && old_class.is_null()) {
- assert(THREAD->is_Java_thread(), "thread->is_Java_thread()");
- JvmtiExport::post_class_load((JavaThread *) THREAD, k());
-
-@@ -1482,7 +1517,7 @@
- }
- }
-
-- define_instance_class(k, THREAD);
-+ define_instance_class(k, KlassHandle(), THREAD);
-
- Handle linkage_exception = Handle(); // null handle
-
-@@ -1613,6 +1648,14 @@
- Universe::flush_dependents_on(k);
- }
-
-+// (tw) Remove from hierarchy - Undo add_to_hierarchy.
-+void SystemDictionary::remove_from_hierarchy(instanceKlassHandle k) {
-+ assert(k.not_null(), "just checking");
-+
-+ k->remove_from_sibling_list();
-+
-+ // TODO: Remove from interfaces.
-+}
-
- // ----------------------------------------------------------------------------
- // GC support
-@@ -1702,6 +1745,24 @@
- }
-
-
-+// (tw) Iterate over all pre-loaded classes in the dictionary.
-+void SystemDictionary::preloaded_classes_do(OopClosure *f) {
-+ for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) {
-+ f->do_oop((oop*) &_well_known_klasses[k]);
-+ }
-+
-+ {
-+ for (int i = 0; i < T_VOID+1; i++) {
-+ if (_box_klasses[i] != NULL) {
-+ assert(i >= T_BOOLEAN, "checking");
-+ f->do_oop((oop*) &_box_klasses[i]);
-+ }
-+ }
-+ }
-+
-+ // TODO: Check if we need to call FilterFieldsMap
-+}
-+
- void SystemDictionary::preloaded_oops_do(OopClosure* f) {
- for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) {
- f->do_oop((oop*) &_well_known_klasses[k]);
-@@ -1732,6 +1793,11 @@
- // Don't iterate over placeholders
- void SystemDictionary::classes_do(void f(klassOop)) {
- dictionary()->classes_do(f);
-+}
-+
-+// (tw) Iterate over all classes in the dictionary.
-+void SystemDictionary::classes_do(ObjectClosure *closure) {
-+ dictionary()->classes_do(closure);
- }
-
- // Added for initialize_itable_for_klass
-@@ -1870,7 +1936,9 @@
-
- // Preload ref klasses and set reference types
- instanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER);
-- instanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass));
-+
-+ // (tw) This is now done in parseClassFile in order to support class redefinition
-+ // instanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass));
-
- initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Cleaner_klass), scan, CHECK);
- instanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT);
-@@ -1957,7 +2025,11 @@
- // also holds array classes
-
- assert(check->klass_part()->oop_is_instance(), "noninstance in systemdictionary");
-- if ((defining == true) || (k() != check)) {
-+ if ((defining == true) && ((k() != check) && k->old_version() != check)) {
-+ ResourceMark rm(Thread::current());
-+ tty->print_cr("(%d / %d) (%s/%s)", k->revision_number(), check->klass_part()->revision_number(), k->name()->as_C_string(), check->klass_part()->name()->as_C_string());
-+ k()->print();
-+ check->print();
- linkage_error = "loader (instance of %s): attempted duplicate class "
- "definition for name: \"%s\"";
- } else {
-diff --git a/src/share/vm/classfile/systemDictionary.hpp b/src/share/vm/classfile/systemDictionary.hpp
-index 85474c5..2dabd95 100644
---- a/src/share/vm/classfile/systemDictionary.hpp
-+++ b/src/share/vm/classfile/systemDictionary.hpp
-@@ -270,7 +270,7 @@
- // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
- static klassOop resolve_from_stream(Symbol* class_name, Handle class_loader,
- Handle protection_domain,
-- ClassFileStream* st, bool verify, TRAPS);
-+ ClassFileStream* st, bool verify, KlassHandle old_class, TRAPS);
-
- // Lookup an already loaded class. If not found NULL is returned.
- static klassOop find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
-@@ -311,6 +311,8 @@
- // Iterate over all klasses in dictionary
- // Just the classes from defining class loaders
- static void classes_do(void f(klassOop));
-+ static void classes_do(ObjectClosure *closure);
-+ static void preloaded_classes_do(OopClosure *closure);
- // Added for initialize_itable_for_klass to handle exceptions
- static void classes_do(void f(klassOop, TRAPS), TRAPS);
- // All classes, and their class loaders
-@@ -416,6 +418,8 @@
- int limit = (int)end_id + 1;
- initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
- }
-+
-+ static void rollback_redefinition();
-
- public:
- #define WK_KLASS_DECLARE(name, symbol, option) \
-@@ -598,11 +602,11 @@
- // after waiting, but before reentering SystemDictionary_lock
- // to preserve lock order semantics.
- static void double_lock_wait(Handle lockObject, TRAPS);
-- static void define_instance_class(instanceKlassHandle k, TRAPS);
-+ static void define_instance_class(instanceKlassHandle k, KlassHandle old_class, TRAPS);
- static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
- Handle class_loader,
- instanceKlassHandle k, TRAPS);
-- static instanceKlassHandle load_shared_class(Symbol* class_name,
-+ static instanceKlassHandle load_shared_class(Symbol* class_name, // after waiting, but before reentering SystemDictionary_lock,
- Handle class_loader, TRAPS);
- static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
- Handle class_loader, TRAPS);
-@@ -617,12 +621,16 @@
- // Setup link to hierarchy
- static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
-
-+public:
-+ // Remove link to hierarchy
-+ static void remove_from_hierarchy(instanceKlassHandle k);
-+
-+private:
- // event based tracing
- static void post_class_load_event(const Ticks& start_time, instanceKlassHandle k,
- Handle initiating_loader);
- static void post_class_unload_events(BoolObjectClosure* is_alive);
-
--private:
- // We pass in the hashtable index so we can calculate it outside of
- // the SystemDictionary_lock.
-
-diff --git a/src/share/vm/classfile/verifier.cpp b/src/share/vm/classfile/verifier.cpp
-index 49c4b2c..74d7614 100644
---- a/src/share/vm/classfile/verifier.cpp
-+++ b/src/share/vm/classfile/verifier.cpp
-@@ -106,7 +106,7 @@
- return !need_verify;
- }
-
--bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, TRAPS) {
-+bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, bool may_use_old_verifier, TRAPS) {
- HandleMark hm;
- ResourceMark rm(THREAD);
-
-@@ -117,7 +117,8 @@
-
- const char* klassName = klass->external_name();
- bool can_failover = FailOverToOldVerifier &&
-- klass->major_version() < NOFAILOVER_MAJOR_VERSION;
-+ klass->major_version() < NOFAILOVER_MAJOR_VERSION &&
-+ may_use_old_verifier;
-
- // If the class should be verified, first see if we can use the split
- // verifier. If not, or if verification fails and FailOverToOldVerifier
-@@ -138,6 +139,7 @@
- tty->print_cr(
- "Fail over class verification to old verifier for: %s", klassName);
- }
-+ assert(may_use_old_verifier, "");
- exception_name = inference_verify(
- klass, message_buffer, message_buffer_len, THREAD);
- }
-@@ -145,6 +147,7 @@
- exception_message = split_verifier.exception_message();
- }
- } else {
-+ assert(may_use_old_verifier, "");
- exception_name = inference_verify(
- klass, message_buffer, message_buffer_len, THREAD);
- }
-@@ -159,6 +162,9 @@
- }
- tty->print_cr("End class verification for: %s", klassName);
- }
-+ } else if (TraceClassInitialization) {
-+ // (tw) Output not verified classes
-+ tty->print_cr("Class %s was not verified", klassName);
- }
-
- if (HAS_PENDING_EXCEPTION) {
-@@ -210,7 +216,7 @@
- // NOTE: this is called too early in the bootstrapping process to be
- // guarded by Universe::is_gte_jdk14x_version()/UseNewReflection.
- (refl_magic_klass == NULL ||
-- !klass->is_subtype_of(refl_magic_klass) ||
-+ !(klass->is_subtype_of(refl_magic_klass) || klass->is_subtype_of(refl_magic_klass->klass_part()->newest_version())) ||
- VerifyReflectionBytecodes)
- );
- }
-@@ -517,7 +523,7 @@
-
- ClassVerifier::ClassVerifier(
- instanceKlassHandle klass, TRAPS)
-- : _thread(THREAD), _exception_type(NULL), _message(NULL), _klass(klass) {
-+ : _thread(THREAD), _exception_type(NULL), _message(NULL), _klass(klass->newest_version()), _klass_to_verify(klass) {
- _this_type = VerificationType::reference_type(klass->name());
- // Create list to hold symbols in reference area.
- _symbols = new GrowableArray<Symbol*>(100, 0, NULL);
-@@ -547,7 +553,7 @@
- _klass->external_name());
- }
-
-- objArrayHandle methods(THREAD, _klass->methods());
-+ objArrayHandle methods(THREAD, _klass_to_verify->methods());
- int num_methods = methods->length();
-
- for (int index = 0; index < num_methods; index++) {
-@@ -2668,7 +2674,10 @@
- VerificationType stack_object_type =
- current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
- if (current_type() != stack_object_type) {
-- assert(cp->cache() == NULL, "not rewritten yet");
-+
-+ // (tw) TODO: Check if relaxing the following assertion is correct. For class redefinition we might call the verifier twice.
-+ //assert(cp->cache() == NULL, "not rewritten yet");
-+
- Symbol* ref_class_name =
- cp->klass_name_at(cp->klass_ref_index_at(index));
- // See the comments in verify_field_instructions() for
-diff --git a/src/share/vm/classfile/verifier.hpp b/src/share/vm/classfile/verifier.hpp
-index 92c4fd2..5e8e0da 100644
---- a/src/share/vm/classfile/verifier.hpp
-+++ b/src/share/vm/classfile/verifier.hpp
-@@ -48,7 +48,7 @@
- * Otherwise, no exception is thrown and the return indicates the
- * error.
- */
-- static bool verify(instanceKlassHandle klass, Mode mode, bool should_verify_class, TRAPS);
-+ static bool verify(instanceKlassHandle klass, Mode mode, bool should_verify_class, bool may_use_old_verifier, TRAPS);
-
- // Return false if the class is loaded by the bootstrap loader,
- // or if defineClass was called requesting skipping verification
-@@ -257,7 +257,10 @@
-
- ErrorContext _error_context; // contains information about an error
-
-+public:
- void verify_method(methodHandle method, TRAPS);
-+
-+private:
- char* generate_code_data(methodHandle m, u4 code_length, TRAPS);
- void verify_exception_handler_table(u4 code_length, char* code_data,
- int& min, int& max, TRAPS);
-@@ -341,6 +344,7 @@
-
- VerificationType object_type() const;
-
-+ instanceKlassHandle _klass_to_verify;
- instanceKlassHandle _klass; // the class being verified
- methodHandle _method; // current method being verified
- VerificationType _this_type; // the verification type of the current class
-diff --git a/src/share/vm/classfile/vmSymbols.hpp b/src/share/vm/classfile/vmSymbols.hpp
-index 51ceb15..7ef1e1f 100644
---- a/src/share/vm/classfile/vmSymbols.hpp
-+++ b/src/share/vm/classfile/vmSymbols.hpp
-@@ -139,6 +139,10 @@
- template(tag_annotation_default, "AnnotationDefault") \
- template(tag_enclosing_method, "EnclosingMethod") \
- template(tag_bootstrap_methods, "BootstrapMethods") \
-+ template(tag_static_field_redefinition_policy, "StaticFieldRedefinitionPolicy") \
-+ template(tag_field_redefinition_policy, "FieldRedefinitionPolicy") \
-+ template(tag_method_redefinition_policy, "MethodRedefinitionPolicy") \
-+ template(tag_code_sections, "CodeSections") \
- \
- /* exception klasses: at least all exceptions thrown by the VM have entries here */ \
- template(java_lang_ArithmeticException, "java/lang/ArithmeticException") \
-@@ -380,6 +384,10 @@
- template(oop_size_name, "oop_size") \
- template(static_oop_field_count_name, "static_oop_field_count") \
- \
-+ /* mutator in case of class redefinition */ \
-+ template(static_transformer_name, "$staticTransformer") \
-+ template(transformer_name, "$transformer") \
-+ \
- /* non-intrinsic name/signature pairs: */ \
- template(register_method_name, "register") \
- do_alias(register_method_signature, object_void_signature) \
-diff --git a/src/share/vm/compiler/compileBroker.cpp b/src/share/vm/compiler/compileBroker.cpp
-index 3e8a65a..fe96a94 100644
---- a/src/share/vm/compiler/compileBroker.cpp
-+++ b/src/share/vm/compiler/compileBroker.cpp
-@@ -1181,6 +1181,14 @@
- int comp_level,
- methodHandle hot_method, int hot_count,
- const char* comment, Thread* THREAD) {
-+ JavaThread* thread = JavaThread::current();
-+ if (thread->is_Compiler_thread() && thread->as_CompilerThread()->should_bailout()) {
-+ return NULL; // FIXME: DCEVM: should we do something else?
-+ }
-+ if (instanceKlass::cast(method->method_holder())->is_not_initialized()) {
-+ return NULL; // FIXME: DCEVM: how should we avoid this?
-+ }
-+
- // make sure arguments make sense
- assert(method->method_holder()->klass_part()->oop_is_instance(), "not an instance method");
- assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
-@@ -1260,6 +1268,7 @@
- }
-
- // RedefineClasses() has replaced this method; just return
-+ // (tw) This is important for the new version of hotswapping: Old code will only execute properly in the interpreter!
- if (method->is_old()) {
- return NULL;
- }
-@@ -1592,6 +1601,8 @@
-
- // Never compile a method if breakpoints are present in it
- if (method()->number_of_breakpoints() == 0) {
-+ thread->compilation_mutex()->lock();
-+ thread->set_should_bailout(false);
- // Compile the method.
- if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
- #ifdef COMPILER1
-@@ -1615,6 +1626,7 @@
- // After compilation is disabled, remove remaining methods from queue
- method->clear_queued_for_compilation();
- }
-+ thread->compilation_mutex()->unlock();
- }
- }
- }
-@@ -2165,3 +2177,15 @@
- st->cr();
- #endif
- }
-+
-+// (tw) Clean up compiler interface after a class redefinition step
-+void CompileBroker::cleanup_after_redefinition() {
-+ int num_threads = _method_threads->length();
-+
-+ ciObjectFactory::sort_ci_objects(ciObjectFactory::_shared_ci_objects);
-+ for (int i=0; i<num_threads; i++) {
-+ if (_method_threads->at(i)->env() != NULL && _method_threads->at(i)->env() != (ciEnv *)badAddress) {
-+ _method_threads->at(i)->env()->cleanup_after_redefinition();
-+ }
-+ }
-+}
-diff --git a/src/share/vm/compiler/compileBroker.hpp b/src/share/vm/compiler/compileBroker.hpp
-index 29f2b22..37989d1 100644
---- a/src/share/vm/compiler/compileBroker.hpp
-+++ b/src/share/vm/compiler/compileBroker.hpp
-@@ -408,6 +408,7 @@
-
- static void print_compiler_threads_on(outputStream* st);
-
-+ static void cleanup_after_redefinition();
- static int get_total_compile_count() { return _total_compile_count; }
- static int get_total_bailout_count() { return _total_bailout_count; }
- static int get_total_invalidated_count() { return _total_invalidated_count; }
-diff --git a/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp b/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp
-index a3abd66..b45f9e1 100644
---- a/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp
-+++ b/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp
-@@ -162,6 +162,13 @@
- }
- }
-
-+
-+HeapWord* CompactibleFreeListSpace::forward_compact_top(size_t size,
-+ CompactPoint* cp, HeapWord* compact_top) {
-+ ShouldNotReachHere();
-+ return NULL;
-+}
-+
- // Like CompactibleSpace forward() but always calls cross_threshold() to
- // update the block offset table. Removed initialize_threshold call because
- // CFLS does not use a block offset array for contiguous spaces.
-diff --git a/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp b/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp
-index 24509b6..6670b73 100644
---- a/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp
-+++ b/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp
-@@ -149,6 +149,7 @@
-
- // Support for compacting cms
- HeapWord* cross_threshold(HeapWord* start, HeapWord* end);
-+ HeapWord* forward_compact_top(size_t size, CompactPoint* cp, HeapWord* compact_top);
- HeapWord* forward(oop q, size_t size, CompactPoint* cp, HeapWord* compact_top);
-
- // Initialization helpers.
-diff --git a/src/share/vm/gc_implementation/shared/markSweep.cpp b/src/share/vm/gc_implementation/shared/markSweep.cpp
-index 29841d8..a13a35d 100644
---- a/src/share/vm/gc_implementation/shared/markSweep.cpp
-+++ b/src/share/vm/gc_implementation/shared/markSweep.cpp
-@@ -32,6 +32,8 @@
- #include "oops/objArrayKlass.inline.hpp"
- #include "oops/oop.inline.hpp"
-
-+GrowableArray<oop>* MarkSweep::_rescued_oops = NULL;
-+
- Stack<oop, mtGC> MarkSweep::_marking_stack;
- Stack<DataLayout*, mtGC> MarkSweep::_revisit_mdo_stack;
- Stack<Klass*, mtGC> MarkSweep::_revisit_klass_stack;
-@@ -357,3 +359,86 @@
- }
-
- #endif
-+
-+// (tw) Copy the rescued objects to their destination address after compaction.
-+void MarkSweep::copy_rescued_objects_back() {
-+
-+ if (_rescued_oops != NULL) {
-+
-+ for (int i=0; i<_rescued_oops->length(); i++) {
-+ oop rescued_obj = _rescued_oops->at(i);
-+
-+ int size = rescued_obj->size();
-+ oop new_obj = rescued_obj->forwardee();
-+
-+ if (rescued_obj->blueprint()->new_version() != NULL) {
-+ MarkSweep::update_fields(rescued_obj, new_obj);
-+ } else {
-+ Copy::aligned_disjoint_words((HeapWord*)rescued_obj, (HeapWord*)new_obj, size);
-+ }
-+
-+ FREE_RESOURCE_ARRAY(HeapWord, rescued_obj, size);
-+
-+ new_obj->init_mark();
-+ assert(new_obj->is_oop(), "must be a valid oop");
-+ }
-+ _rescued_oops->clear();
-+ _rescued_oops = NULL;
-+ }
-+}
-+
-+// (tw) Update instances of a class whose fields changed.
-+void MarkSweep::update_fields(oop q, oop new_location) {
-+
-+ assert(q->blueprint()->new_version() != NULL, "class of old object must have new version");
-+
-+ klassOop old_klass_oop = q->klass();
-+ klassOop new_klass_oop = q->blueprint()->new_version();
-+
-+ instanceKlass *old_klass = instanceKlass::cast(old_klass_oop);
-+ instanceKlass *new_klass = instanceKlass::cast(new_klass_oop);
-+
-+ int size = q->size_given_klass(old_klass);
-+ int new_size = q->size_given_klass(new_klass);
-+
-+ oop tmp_obj = q;
-+
-+ if (new_klass_oop->klass_part()->is_copying_backwards()) {
-+ if (((HeapWord *)q >= (HeapWord *)new_location && (HeapWord *)q < (HeapWord *)new_location + new_size) ||
-+ ((HeapWord *)new_location >= (HeapWord *)q && (HeapWord *)new_location < (HeapWord *)q + size)) {
-+ tmp_obj = (oop)resource_allocate_bytes(size * HeapWordSize);
-+ Copy::aligned_disjoint_words((HeapWord*)q, (HeapWord*)tmp_obj, size);
-+ }
-+ }
-+
-+ int *cur = new_klass_oop->klass_part()->update_information();
-+
-+ tmp_obj->set_klass_no_check(new_klass_oop);
-+
-+ if (cur == NULL) {
-+ assert(size == new_size, "just checking");
-+ Copy::conjoint_words(((HeapWord *)tmp_obj), ((HeapWord *)new_location), size);
-+ } else {
-+ int destOffset = 0;
-+ while (*cur != 0) {
-+ if (*cur > 0) {
-+ int size = *cur;
-+ cur++;
-+ int offset = *cur;
-+ Copy::conjoint_jbytes(((char *)tmp_obj) + offset, ((char *)new_location) + destOffset, size);
-+ destOffset += size;
-+ cur++;
-+ } else {
-+ assert(*cur < 0, "");
-+ int skip = -*cur;
-+ Copy::fill_to_bytes(((char*)new_location) + destOffset, skip, 0);
-+ destOffset += skip;
-+ cur++;
-+ }
-+ }
-+ }
-+
-+ if (tmp_obj != q) {
-+ FREE_RESOURCE_ARRAY(HeapWord, tmp_obj, size);
-+ }
-+}
-diff --git a/src/share/vm/gc_implementation/shared/markSweep.hpp b/src/share/vm/gc_implementation/shared/markSweep.hpp
-index eb8252c..b96a677 100644
---- a/src/share/vm/gc_implementation/shared/markSweep.hpp
-+++ b/src/share/vm/gc_implementation/shared/markSweep.hpp
-@@ -117,7 +117,11 @@
- friend class AdjustPointerClosure;
- friend class KeepAliveClosure;
- friend class VM_MarkSweep;
-+ friend class GenMarkSweep;
- friend void marksweep_init();
-+
-+public:
-+ static GrowableArray<oop>* _rescued_oops;
-
- //
- // Vars
-@@ -208,6 +212,8 @@
- template <class T> static inline void mark_and_push(T* p);
- static inline void push_objarray(oop obj, size_t index);
-
-+ static void copy_rescued_objects_back();
-+ static void update_fields(oop q, oop new_location);
- static void follow_stack(); // Empty marking stack.
-
- static void preserve_mark(oop p, markOop mark);
-diff --git a/src/share/vm/interpreter/interpreterRuntime.cpp b/src/share/vm/interpreter/interpreterRuntime.cpp
-index 1a1af1b..94972f0 100644
---- a/src/share/vm/interpreter/interpreterRuntime.cpp
-+++ b/src/share/vm/interpreter/interpreterRuntime.cpp
-@@ -402,7 +402,7 @@
- assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
- assert(h_exception->is_oop(), "just checking");
- // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
-- if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
-+ if (!(h_exception->is_a(SystemDictionary::Throwable_klass()->klass_part()->newest_version())) && !(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
- if (ExitVMOnVerifyError) vm_exit(-1);
- ShouldNotReachHere();
- }
-@@ -656,6 +656,82 @@
- JvmtiExport::post_raw_breakpoint(thread, method, bcp);
- IRT_END
-
-+// (tw) Correctly resolve method when running old code.
-+IRT_ENTRY(void, InterpreterRuntime::forward_method(JavaThread *thread))
-+ {
-+ MonitorLockerEx ml(RedefinitionSync_lock);
-+ while (Threads::wait_at_instrumentation_entry()) {
-+ ml.wait();
-+ }
-+ }
-+ frame f = last_frame(thread);
-+ methodOop m = f.interpreter_frame_method();
-+ methodOop forward_method = m->forward_method();
-+ if (forward_method != NULL) {
-+ int bci = f.interpreter_frame_bci();
-+
-+ if (TraceRedefineClasses >= 3) {
-+ tty->print_cr("Executing NOP in method %s at bci %d %d", m->name()->as_C_string(), bci, m->is_in_code_section(bci + 1));
-+ }
-+
-+ int next_bci = bci - 1;
-+ // First try bci before NOP.
-+ if (!m->is_in_code_section(next_bci)) {
-+ // Try bci after NOP.
-+ next_bci = bci + 1;
-+ if (!m->is_in_code_section(next_bci)) return;
-+ }
-+
-+ int new_bci = m->calculate_forward_bci(next_bci, forward_method);
-+ if (TraceRedefineClasses >= 2) {
-+ tty->print_cr("Transferring execution of %s to new method old_bci=%d new_bci=%d", forward_method->name()->as_C_string(), bci, new_bci);
-+ }
-+ RegisterMap reg_map(thread);
-+ vframe* vf = vframe::new_vframe(&f, ®_map, thread);
-+ interpretedVFrame *iframe = (interpretedVFrame *)vf;
-+ iframe->set_method(forward_method, new_bci - 1);
-+ }
-+IRT_END
-+
-+// (tw) Correctly resolve method when running old code.
-+IRT_ENTRY(void, InterpreterRuntime::find_correct_method(JavaThread *thread, oopDesc* receiverOop, int vTableIndex))
-+ // extract receiver from the outgoing argument list if necessary
-+ Handle receiver(thread, receiverOop);
-+
-+ // TODO: Check for invokeinterface!
-+ Bytecodes::Code bytecode = Bytecodes::_invokevirtual;
-+
-+ int method_holder_revision_number = method(thread)->method_holder()->klass_part()->revision_number();
-+ klassOop klass = receiverOop->klass();
-+ while (klass->klass_part()->revision_number() > method_holder_revision_number) {
-+ klass = klass->klass_part()->old_version();
-+ }
-+
-+ // TODO: Check for correctness if different vtable indices in different versions?
-+
-+ methodOop method = ((instanceKlass *)klass->klass_part())->method_at_vtable(vTableIndex);
-+ thread->set_vm_result(method);
-+IRT_END
-+
-+// Correctly resolve interface method when running old code.
-+IRT_ENTRY(void, InterpreterRuntime::find_correct_interface_method(JavaThread *thread, oopDesc* receiverOop, oopDesc* interface_klass, int vTableIndex))
-+
-+ // extract receiver from the outgoing argument list if necessary
-+ Handle receiver(thread, receiverOop);
-+
-+ // TODO: Check for invokeinterface!
-+ Bytecodes::Code bytecode = Bytecodes::_invokevirtual;
-+
-+ int method_holder_revision_number = method(thread)->method_holder()->klass_part()->revision_number();
-+ klassOop klass = receiverOop->klass();
-+ while (klass->klass_part()->revision_number() > method_holder_revision_number) {
-+ klass = klass->klass_part()->old_version();
-+ }
-+
-+ methodOop method = ((instanceKlass *)klass->klass_part())->method_at_itable((klassOop)interface_klass, vTableIndex, THREAD);
-+ thread->set_vm_result(method);
-+IRT_END
-+
- IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode)) {
- // extract receiver from the outgoing argument list if necessary
- Handle receiver(thread, NULL);
-@@ -684,6 +760,10 @@
- if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
- int retry_count = 0;
- while (info.resolved_method()->is_old()) {
-+ // (tw) If we are executing an old method, this is OK!
-+ if (method(thread)->is_old()) {
-+ break;
-+ }
- // It is very unlikely that method is redefined more than 100 times
- // in the middle of resolve. If it is looping here more than 100 times
- // means then there could be a bug here.
-diff --git a/src/share/vm/interpreter/interpreterRuntime.hpp b/src/share/vm/interpreter/interpreterRuntime.hpp
-index 6d5f13a..50fa219 100644
---- a/src/share/vm/interpreter/interpreterRuntime.hpp
-+++ b/src/share/vm/interpreter/interpreterRuntime.hpp
-@@ -141,6 +141,9 @@
- static void post_method_entry(JavaThread *thread);
- static void post_method_exit (JavaThread *thread);
- static int interpreter_contains(address pc);
-+ static void forward_method(JavaThread *thread);
-+ static void find_correct_method(JavaThread *thread, oopDesc* receiver, int vTableIndex);
-+ static void find_correct_interface_method(JavaThread *thread, oopDesc* receiver, oopDesc* interface_klass, int vTableIndex);
-
- // Native signature handlers
- static void prepare_native_call(JavaThread* thread, methodOopDesc* method);
-diff --git a/src/share/vm/interpreter/linkResolver.cpp b/src/share/vm/interpreter/linkResolver.cpp
-index 1676add..ccd5241 100644
---- a/src/share/vm/interpreter/linkResolver.cpp
-+++ b/src/share/vm/interpreter/linkResolver.cpp
-@@ -153,8 +153,8 @@
- // Klass resolution
-
- void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) {
-- if (!Reflection::verify_class_access(ref_klass->as_klassOop(),
-- sel_klass->as_klassOop(),
-+ if (!Reflection::verify_class_access(ref_klass->as_klassOop()->klass_part()->newest_version(),
-+ sel_klass->as_klassOop()->klass_part()->newest_version(),
- true)) {
- ResourceMark rm(THREAD);
- Exceptions::fthrow(
-@@ -346,7 +346,7 @@
- // We'll check for the method name first, as that's most likely
- // to be false (so we'll short-circuit out of these tests).
- if (sel_method->name() == vmSymbols::clone_name() &&
-- sel_klass() == SystemDictionary::Object_klass() &&
-+ sel_klass()->klass_part()->newest_version() == SystemDictionary::Object_klass()->klass_part()->newest_version() &&
- resolved_klass->oop_is_array()) {
- // We need to change "protected" to "public".
- assert(flags.is_protected(), "clone not protected?");
-@@ -412,6 +412,154 @@
- }
- }
-
-+
-+void LinkResolver::lookup_method(methodHandle& resolved_method, KlassHandle resolved_klass,
-+ Symbol* method_name, Symbol* method_signature, bool is_interface, KlassHandle current_klass, TRAPS) {
-+
-+ // Interface method lookup?
-+ if (is_interface) {
-+
-+ // lookup method in this interface or its super, java.lang.Object
-+ lookup_instance_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, CHECK);
-+
-+ if (resolved_method.is_null() && !resolved_klass->oop_is_array()) {
-+ // lookup method in all the super-interfaces
-+ lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK);
-+ }
-+
-+ // Other methods
-+ } else {
-+ Handle nested_exception;
-+
-+ // 2. lookup method in resolved klass and its super klasses
-+ lookup_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, CHECK);
-+
-+ if (resolved_method.is_null() && !resolved_klass->oop_is_array()) { // not found in the class hierarchy
-+ // 3. lookup method in all the interfaces implemented by the resolved klass
-+ lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK);
-+
-+ if (resolved_method.is_null()) {
-+ // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
-+ lookup_polymorphic_method(resolved_method, resolved_klass, method_name, method_signature,
-+ current_klass, (Handle*)NULL, (Handle*)NULL, THREAD);
-+ if (HAS_PENDING_EXCEPTION) {
-+ nested_exception = Handle(THREAD, PENDING_EXCEPTION);
-+ CLEAR_PENDING_EXCEPTION;
-+ }
-+ }
-+ }
-+ }
-+}
-+
-+void LinkResolver::lookup_correct_field(fieldDescriptor &fd, KlassHandle &sel_klass, KlassHandle resolved_klass, KlassHandle current_klass, Symbol* field_name, Symbol* field_sig, bool is_static) {
-+
-+ // First attempt unversioned
-+ sel_klass = KlassHandle(Thread::current(), resolved_klass->find_field(field_name, field_sig, &fd));
-+
-+ if (!current_klass.is_null() && !current_klass->is_newest_version()) {
-+
-+ // Look for the policy defined in the new version of the class (_not_ in the newest, but only in the newer relative to current klass).
-+ int redefinition_policy = current_klass->new_version()->klass_part()->field_redefinition_policy();
-+ if (is_static) {
-+ redefinition_policy = current_klass->new_version()->klass_part()->static_field_redefinition_policy();
-+ }
-+
-+ assert(redefinition_policy != Klass::StaticCheck, "if the policy is static check, then we can never reach here");
-+
-+ if (redefinition_policy != Klass::DynamicCheck) {
-+
-+ if (redefinition_policy == Klass::AccessOldMembers) {
-+ // Forget looked up fields
-+ sel_klass = KlassHandle(Thread::current(), (oop)NULL);
-+ }
-+
-+ assert(redefinition_policy == Klass::AccessOldMembers || redefinition_policy == Klass::AccessDeletedMembers, "");
-+
-+ if (sel_klass.is_null() || fd.is_static() != is_static /* access old static field field is changed from static to non-static */) {
-+
-+ // Select correct version for resolved klass.
-+ find_correct_resolved_klass(resolved_klass, current_klass);
-+
-+ sel_klass = KlassHandle(Thread::current(), instanceKlass::cast(resolved_klass())->find_field(field_name, field_sig, &fd));
-+
-+ // FIXME: idubrov
-+ //if (sel_klass.is_null()) {
-+ // TRACE_RC2("Trying to resolve field (%s) in old universe failed => exception is the correct behaviour", field_name->as_C_string());
-+ //} else {
-+ // assert(sel_klass->new_version() != NULL, "must be old class!");
-+ // TRACE_RC2("Resolved a field in the old universe (%s)!", field_name->as_C_string());
-+ //}
-+ }
-+ }
-+ }
-+}
-+
-+void LinkResolver::lookup_correct_method(methodHandle& resolved_method, KlassHandle resolved_klass, KlassHandle current_klass,
-+ Symbol* method_name, Symbol* method_signature, bool is_interface, TRAPS) {
-+
-+ // First attempt unversioned
-+ lookup_method(resolved_method, resolved_klass, method_name, method_signature, is_interface, current_klass, CHECK);
-+
-+ // (tw) Are we in an old method that wants to see a different view on the world?
-+ if (!current_klass.is_null() && !current_klass->is_newest_version()) {
-+
-+ // Look for the policy defined in the new version of the class (_not_ in the newest, but only in the newer relative to current klass).
-+ int method_redefinition_policy = current_klass->new_version()->klass_part()->method_redefinition_policy();
-+ assert(method_redefinition_policy != Klass::StaticCheck, "if the policy is static check, then we can never reach here");
-+
-+ if (method_redefinition_policy != Klass::DynamicCheck) {
-+
-+ // We do not throw the exception
-+ if (method_redefinition_policy == Klass::AccessOldMembers) {
-+ // Forget any new member lookup
-+ resolved_method = methodHandle(THREAD, NULL);
-+ }
-+
-+ assert(method_redefinition_policy == Klass::AccessOldMembers || method_redefinition_policy == Klass::AccessDeletedMembers, "");
-+
-+ if (resolved_method.is_null()) {
-+
-+ // Select correct version for resolved klass.
-+ find_correct_resolved_klass(resolved_klass, current_klass);
-+
-+ // Now do the lookup in a second attempt with a different resolved klass.
-+ lookup_method(resolved_method, resolved_klass, method_name, method_signature, is_interface, current_klass, CHECK);
-+
-+ // FIXME: idubrov
-+ //IF_TRACE_RC2 {
-+ // ResourceMark rm(THREAD);
-+ // if (resolved_method.is_null()) {
-+ // TRACE_RC2("Trying to resolve method (%s) in old universe failed => exception is the correct behaviour", method_name->as_C_string());
-+ // } else {
-+ // assert(resolved_method->is_old(), "must be old method!");
-+ // TRACE_RC2("Resolved a method in the old universe (%s)!", resolved_method->name()->as_C_string());
-+ // }
-+ //}
-+ }
-+ }
-+ }
-+
-+ if (resolved_method.is_null()) {
-+ // no method found
-+ ResourceMark rm(THREAD);
-+ THROW_MSG(vmSymbols::java_lang_NoSuchMethodError(),
-+ methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
-+ method_name,
-+ method_signature));
-+ }
-+}
-+
-+void LinkResolver::find_correct_resolved_klass(KlassHandle &resolved_klass, KlassHandle ¤t_klass) {
-+ int current_klass_revision = current_klass->revision_number();
-+ int resolved_klass_revision = resolved_klass->revision_number();
-+ // FIXME: idubrov
-+ //TRACE_RC2("The two different revision numbers for interfaces: current=%d / resolved_callee=%d", current_klass_revision, resolved_klass_revision);
-+
-+ while (resolved_klass->revision_number() > current_klass_revision) {
-+ assert(resolved_klass->old_version(), "must have old version");
-+ resolved_klass = KlassHandle(Thread::current(), resolved_klass->old_version());
-+ }
-+}
- void LinkResolver::resolve_method(methodHandle& resolved_method, KlassHandle resolved_klass,
- Symbol* method_name, Symbol* method_signature,
- KlassHandle current_klass, bool check_access, TRAPS) {
-@@ -424,35 +572,8 @@
- THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
- }
-
-- Handle nested_exception;
--
-- // 2. lookup method in resolved klass and its super klasses
-- lookup_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, CHECK);
--
-- if (resolved_method.is_null() && !resolved_klass->oop_is_array()) { // not found in the class hierarchy
-- // 3. lookup method in all the interfaces implemented by the resolved klass
-- lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK);
--
-- if (resolved_method.is_null()) {
-- // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
-- lookup_polymorphic_method(resolved_method, resolved_klass, method_name, method_signature,
-- current_klass, (Handle*)NULL, (Handle*)NULL, THREAD);
-- if (HAS_PENDING_EXCEPTION) {
-- nested_exception = Handle(THREAD, PENDING_EXCEPTION);
-- CLEAR_PENDING_EXCEPTION;
-- }
-- }
-- }
--
-- if (resolved_method.is_null()) {
-- // 4. method lookup failed
-- ResourceMark rm(THREAD);
-- THROW_MSG_CAUSE(vmSymbols::java_lang_NoSuchMethodError(),
-- methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
-- method_name,
-- method_signature),
-- nested_exception);
-- }
-+ // 2. and 3. and 4. lookup method in resolved klass and its super klasses
-+ lookup_correct_method(resolved_method, resolved_klass, current_klass, method_name, method_signature, false, CHECK);
-
- // 5. check if method is concrete
- if (resolved_method->is_abstract() && !resolved_klass->is_abstract()) {
-@@ -520,7 +641,10 @@
- }
-
- // lookup method in this interface or its super, java.lang.Object
-- lookup_instance_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, CHECK);
-+ lookup_correct_method(resolved_method, resolved_klass, current_klass, method_name, method_signature, true, CHECK);
-+
-+
-+
-
- if (resolved_method.is_null() && !resolved_klass->oop_is_array()) {
- // lookup method in all the super-interfaces
-@@ -621,9 +745,14 @@
- THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
- }
-
-+ KlassHandle ref_klass(THREAD, pool->pool_holder()->klass_part());
-+
- // Resolve instance field
- fieldDescriptor fd; // find_field initializes fd if found
-- KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd));
-+
-+ KlassHandle sel_klass;
-+ lookup_correct_field(fd, sel_klass, resolved_klass, ref_klass, field, sig, is_static);
-+
- // check if field exists; i.e., if a klass containing the field def has been selected
- if (sel_klass.is_null()){
- ResourceMark rm(THREAD);
-@@ -631,7 +760,6 @@
- }
-
- // check access
-- KlassHandle ref_klass(THREAD, pool->pool_holder());
- check_field_accessability(ref_klass, resolved_klass, sel_klass, fd, CHECK);
-
- // check for errors
-@@ -643,7 +771,7 @@
- }
-
- // Final fields can only be accessed from its own class.
-- if (is_put && fd.access_flags().is_final() && sel_klass() != pool->pool_holder()) {
-+ if (is_put && fd.access_flags().is_final() && sel_klass() != pool->pool_holder()->klass_part()->active_version() && sel_klass() != pool->pool_holder()) {
- THROW(vmSymbols::java_lang_IllegalAccessError());
- }
-
-@@ -848,7 +976,7 @@
- bool check_access, bool check_null_and_abstract, TRAPS) {
- methodHandle resolved_method;
- linktime_resolve_virtual_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
-- runtime_resolve_virtual_method(result, resolved_method, resolved_klass, recv, receiver_klass, check_null_and_abstract, CHECK);
-+ runtime_resolve_virtual_method(result, resolved_method, resolved_klass, recv, receiver_klass, current_klass, check_null_and_abstract, CHECK);
- }
-
- // throws linktime exceptions
-@@ -878,6 +1006,7 @@
- KlassHandle resolved_klass,
- Handle recv,
- KlassHandle recv_klass,
-+ KlassHandle current_klass,
- bool check_null_and_abstract,
- TRAPS) {
-
-@@ -926,10 +1055,44 @@
- // recv_klass might be an arrayKlassOop but all vtables start at
- // the same place. The cast is to avoid virtual call and assertion.
- instanceKlass* inst = (instanceKlass*)recv_klass()->klass_part();
-- selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
-+
-+ // (tw) The type of the virtual method call and the type of the receiver do not need to
-+ // have anything in common, as the receiver type could've been hotswapped.
-+ // Does not always work (method could be resolved with correct dynamic type and later
-+ // be called at the same place with a wrong dynamic type).
-+ // (tw) TODO: Need to handle the static type vs dynamic type issue more generally.
-+
-+ // The vTable must be based on the view of the world of the resolved method
-+ klassOop method_holder = resolved_method->method_holder();
-+
-+ if (method_holder->klass_part()->new_version() != NULL) {
-+ // We are executing in old code
-+ // FIXME: idubrov
-+ //TRACE_RC2("Calling a method in old code");
-+ while (method_holder->klass_part()->revision_number() < inst->revision_number()) {
-+ inst = (instanceKlass *)(inst->old_version()->klass_part());
-+ }
-+ }
-+
-+ if (inst->is_subtype_of(method_holder)) {
-+ selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
-+ } else {
-+
-+ tty->print_cr("Failure:");
-+ inst->as_klassOop()->print();
-+ inst->super()->print();
-+ juint off = inst->super_check_offset();
-+ klassOop sup = *(klassOop*)( (address)inst->as_klassOop() + off );
-+ sup->print();
-+ method_holder->print();
-+
-+ bool b = inst->is_subtype_of(method_holder);
-+ THROW_MSG(vmSymbols::java_lang_NoSuchMethodError(), "(tw) A virtual method was called, but the type of the receiver is not related with the type of the class of the called method!");
-+ }
- }
- }
-
-+
- // check if method exists
- if (selected_method.is_null()) {
- ResourceMark rm(THREAD);
-diff --git a/src/share/vm/interpreter/linkResolver.hpp b/src/share/vm/interpreter/linkResolver.hpp
-index dfd74f9..cf6e44a 100644
---- a/src/share/vm/interpreter/linkResolver.hpp
-+++ b/src/share/vm/interpreter/linkResolver.hpp
-@@ -110,7 +110,11 @@
- // It does all necessary link-time checks & throws exceptions if necessary.
-
- class LinkResolver: AllStatic {
-- private:
-+private:
-+ static void lookup_method (methodHandle& result, KlassHandle resolved_klass, Symbol* name, Symbol* signature, bool is_interface, KlassHandle current_klass, TRAPS);
-+ static void lookup_correct_field (fieldDescriptor &fd, KlassHandle &sel_klass, KlassHandle resolved_klass, KlassHandle current_klass, Symbol* field_name, Symbol* field_sig, bool is_static);
-+ static void lookup_correct_method (methodHandle& result, KlassHandle resolved_klass, KlassHandle current_klass, Symbol* name, Symbol* signature, bool is_interface, TRAPS);
-+ static void find_correct_resolved_klass (KlassHandle &resolved_klass, KlassHandle ¤t_klass);
- static void lookup_method_in_klasses (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
- static void lookup_instance_method_in_klasses (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
- static void lookup_method_in_interfaces (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
-@@ -133,7 +137,7 @@
- static void linktime_resolve_interface_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS);
-
- static void runtime_resolve_special_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, KlassHandle current_klass, bool check_access, TRAPS);
-- static void runtime_resolve_virtual_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, Handle recv, KlassHandle recv_klass, bool check_null_and_abstract, TRAPS);
-+ static void runtime_resolve_virtual_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, Handle recv, KlassHandle recv_klass, KlassHandle current_klass, bool check_null_and_abstract, TRAPS);
- static void runtime_resolve_interface_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, Handle recv, KlassHandle recv_klass, bool check_null_and_abstract, TRAPS);
-
- static void check_field_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, fieldDescriptor& fd, TRAPS);
-diff --git a/src/share/vm/interpreter/templateTable.hpp b/src/share/vm/interpreter/templateTable.hpp
-index 17e9f26..e77500f 100644
---- a/src/share/vm/interpreter/templateTable.hpp
-+++ b/src/share/vm/interpreter/templateTable.hpp
-@@ -329,8 +329,8 @@
- static void shouldnotreachhere();
-
- // jvmti support
-- static void jvmti_post_field_access(Register cache, Register index, bool is_static, bool has_tos);
-- static void jvmti_post_field_mod(Register cache, Register index, bool is_static);
-+ static void jvmti_post_field_access(Register cache, Register index, int byte_no, bool is_static, bool has_tos);
-+ static void jvmti_post_field_mod(Register cache, Register index, int byte_no, bool is_static);
- static void jvmti_post_fast_field_mod();
-
- // debugging of TemplateGenerator
-diff --git a/src/share/vm/memory/genMarkSweep.cpp b/src/share/vm/memory/genMarkSweep.cpp
-index 76e18d8..6af7c14 100644
---- a/src/share/vm/memory/genMarkSweep.cpp
-+++ b/src/share/vm/memory/genMarkSweep.cpp
-@@ -421,6 +421,7 @@
- // in the same order in phase2, phase3 and phase4. We don't quite do that
- // here (perm_gen first rather than last), so we tell the validate code
- // to use a higher index (saved from phase2) when verifying perm_gen.
-+ assert(_rescued_oops == NULL, "must be empty before processing");
- GenCollectedHeap* gch = GenCollectedHeap::heap();
- Generation* pg = gch->perm_gen();
-
-@@ -433,10 +434,14 @@
-
- VALIDATE_MARK_SWEEP_ONLY(reset_live_oop_tracking(false));
-
-+ MarkSweep::copy_rescued_objects_back();
-+
- GenCompactClosure blk;
- gch->generation_iterate(&blk, true);
-
- VALIDATE_MARK_SWEEP_ONLY(compaction_complete());
-
-+ MarkSweep::copy_rescued_objects_back();
-+
- pg->post_compact(); // Shared spaces verification.
- }
-diff --git a/src/share/vm/memory/permGen.cpp b/src/share/vm/memory/permGen.cpp
-index 350f583..59faad1 100644
---- a/src/share/vm/memory/permGen.cpp
-+++ b/src/share/vm/memory/permGen.cpp
-@@ -57,7 +57,12 @@
-
- for (;;) {
- {
-- MutexLocker ml(Heap_lock);
-+ // (tw) Only lock when not at a safepoint (necessary to use the split verifier from the VmThread)
-+ Monitor *lock = Heap_lock;
-+ if (SafepointSynchronize::is_at_safepoint()) {
-+ lock = NULL;
-+ }
-+ MutexLockerEx ml(lock);
- if ((obj = gen->allocate(size, false)) != NULL) {
- return obj;
- }
-diff --git a/src/share/vm/memory/space.cpp b/src/share/vm/memory/space.cpp
-index f97bc34..9b20d08 100644
---- a/src/share/vm/memory/space.cpp
-+++ b/src/share/vm/memory/space.cpp
-@@ -378,6 +378,31 @@
- _compaction_top = bottom();
- }
-
-+// (tw) Calculates the compact_top that will be used for placing the next object with the giving size on the heap.
-+HeapWord* CompactibleSpace::forward_compact_top(size_t size,
-+CompactPoint* cp, HeapWord* compact_top) {
-+ // First check if we should switch compaction space
-+ assert(this == cp->space, "'this' should be current compaction space.");
-+ size_t compaction_max_size = pointer_delta(end(), compact_top);
-+ while (size > compaction_max_size) {
-+ // switch to next compaction space
-+ cp->space->set_compaction_top(compact_top);
-+ cp->space = cp->space->next_compaction_space();
-+ if (cp->space == NULL) {
-+ cp->gen = GenCollectedHeap::heap()->prev_gen(cp->gen);
-+ assert(cp->gen != NULL, "compaction must succeed");
-+ cp->space = cp->gen->first_compaction_space();
-+ assert(cp->space != NULL, "generation must have a first compaction space");
-+ }
-+ compact_top = cp->space->bottom();
-+ cp->space->set_compaction_top(compact_top);
-+ cp->threshold = cp->space->initialize_threshold();
-+ compaction_max_size = pointer_delta(cp->space->end(), compact_top);
-+ }
-+
-+ return compact_top;
-+}
-+
- HeapWord* CompactibleSpace::forward(oop q, size_t size,
- CompactPoint* cp, HeapWord* compact_top) {
- // q is alive
-@@ -401,7 +426,7 @@
- }
-
- // store the forwarding pointer into the mark word
-- if ((HeapWord*)q != compact_top) {
-+ if ((HeapWord*)q != compact_top || (size_t)q->size() != size) {
- q->forward_to(oop(compact_top));
- assert(q->is_gc_marked(), "encoding the pointer should preserve the mark");
- } else {
-@@ -449,7 +474,208 @@
-
- // Faster object search.
- void ContiguousSpace::prepare_for_compaction(CompactPoint* cp) {
-- SCAN_AND_FORWARD(cp, top, block_is_always_obj, obj_size);
-+ if (!Universe::is_redefining_gc_run()) {
-+ SCAN_AND_FORWARD(cp, top, block_is_always_obj, obj_size);
-+ return;
-+ }
-+
-+ /* Compute the new addresses for the live objects and store it in the mark
-+ * Used by universe::mark_sweep_phase2()
-+ */
-+ HeapWord* compact_top; /* This is where we are currently compacting to. */
-+
-+ /* We're sure to be here before any objects are compacted into this
-+ * space, so this is a good time to initialize this:
-+ */
-+ set_compaction_top(bottom());
-+
-+ if (cp->space == NULL) {
-+ assert(cp->gen != NULL, "need a generation");
-+ assert(cp->threshold == NULL, "just checking");
-+ assert(cp->gen->first_compaction_space() == this, "just checking");
-+ cp->space = cp->gen->first_compaction_space();
-+ compact_top = cp->space->bottom();
-+ cp->space->set_compaction_top(compact_top);
-+ cp->threshold = cp->space->initialize_threshold();
-+ } else {
-+ compact_top = cp->space->compaction_top();
-+ }
-+
-+ /* We allow some amount of garbage towards the bottom of the space, so
-+ * we don't start compacting before there is a significant gain to be made.
-+ * Occasionally, we want to ensure a full compaction, which is determined
-+ * by the MarkSweepAlwaysCompactCount parameter.
-+ */
-+ int invocations = SharedHeap::heap()->perm_gen()->stat_record()->invocations;
-+ bool skip_dead = (MarkSweepAlwaysCompactCount < 1)
-+ ||((invocations % MarkSweepAlwaysCompactCount) != 0);
-+
-+ size_t allowed_deadspace = 0;
-+ if (skip_dead) {
-+ int ratio = (int)allowed_dead_ratio();
-+ allowed_deadspace = (capacity() * ratio / 100) / HeapWordSize;
-+ }
-+
-+ HeapWord* q = bottom();
-+ HeapWord* t = end();
-+
-+ HeapWord* end_of_live= q; /* One byte beyond the last byte of the last
-+ live object. */
-+ HeapWord* first_dead = end();/* The first dead object. */
-+ LiveRange* liveRange = NULL; /* The current live range, recorded in the
-+ first header of preceding free area. */
-+ _first_dead = first_dead;
-+
-+ const intx interval = PrefetchScanIntervalInBytes;
-+
-+ while (q < t) {
-+ assert(!block_is_obj(q) ||
-+ oop(q)->mark()->is_marked() || oop(q)->mark()->is_unlocked() ||
-+ oop(q)->mark()->has_bias_pattern(),
-+ "these are the only valid states during a mark sweep");
-+ if (block_is_obj(q) && oop(q)->is_gc_marked()) {
-+ /* prefetch beyond q */
-+ Prefetch::write(q, interval);
-+ /* size_t size = oop(q)->size(); changing this for cms for perm gen */
-+ size_t size = block_size(q);
-+
-+ // DCEVM: begin
-+ //////////////////////////////////////////////////////////////////////////
-+ size_t forward_size = size;
-+
-+ // Compute the forward sizes and leave out objects whose position could
-+ // possibly overlap other objects.
-+
-+ // DCEVM: There is a new version of the class of q => different size
-+ if (oop(q)->blueprint()->new_version() != NULL && oop(q)->blueprint()->new_version()->klass_part()->update_information() != NULL) {
-+
-+ size_t new_size = oop(q)->size_given_klass(oop(q)->blueprint()->new_version()->klass_part());
-+ assert(size != new_size || oop(q)->is_perm(), "instances without changed size have to be updated prior to GC run");
-+ forward_size = new_size;
-+ }
-+
-+ compact_top = cp->space->forward_compact_top(forward_size, cp, compact_top);
-+
-+ bool rescueing = false;
-+ if (rescueing = must_rescue(oop(q), oop(compact_top))) {
-+ if (MarkSweep::_rescued_oops == NULL) {
-+ MarkSweep::_rescued_oops = new GrowableArray<oop>(128);
-+ }
-+ // FIXME: idubrov
-+ //TRACE_RC5("rescue obj %d klass=%s", MarkSweep::_rescued_oops->length(), oop(q)->klass()->klass_part()->name()->as_C_string());
-+ MarkSweep::_rescued_oops->append(oop(q));
-+ } else {
-+ compact_top = cp->space->forward(oop(q), forward_size, cp, compact_top);
-+ }
-+
-+ if ((size != forward_size || rescueing) && q < first_dead) {
-+ // (tw) This object moves => first_dead must be set to here!
-+ first_dead = q;
-+ }
-+ //////////////////////////////////////////////////////////////////////////
-+ q += size;
-+ end_of_live = q;
-+ } else {
-+ /* run over all the contiguous dead objects */
-+ HeapWord* end = q;
-+ do {
-+ /* prefetch beyond end */
-+ Prefetch::write(end, interval);
-+ end += block_size(end);
-+ } while (end < t && (!block_is_obj(end) || !oop(end)->is_gc_marked()));
-+
-+ /* see if we might want to pretend this object is alive so that
-+ * we don't have to compact quite as often.
-+ */
-+ if (allowed_deadspace > 0 && q == compact_top) {
-+ size_t sz = pointer_delta(end, q);
-+ if (insert_deadspace(allowed_deadspace, q, sz)) {
-+ compact_top = cp->space->forward(oop(q), sz, cp, compact_top);
-+ q = end;
-+ end_of_live = end;
-+ continue;
-+ }
-+ }
-+
-+ /* otherwise, it really is a free region. */
-+
-+ /* for the previous LiveRange, record the end of the live objects. */
-+ if (liveRange) {
-+ liveRange->set_end(q);
-+ }
-+
-+ /* record the current LiveRange object.
-+ * liveRange->start() is overlaid on the mark word.
-+ */
-+ liveRange = (LiveRange*)q;
-+ liveRange->set_start(end);
-+ liveRange->set_end(end);
-+
-+ /* see if this is the first dead region. */
-+ if (q < first_dead) {
-+ first_dead = q;
-+ }
-+
-+ /* move on to the next object */
-+ q = end;
-+ }
-+ }
-+
-+ //////////////////////////////////////////////////////////////////////////
-+ // Compute the forwarding addresses for the objects that need to be
-+ // rescued.
-+ // TODO: empty the _rescued_oops after ALL spaces are compacted!
-+ if (MarkSweep::_rescued_oops != NULL) {
-+ // FIXME: idubrov
-+ //TRACE_RC2("Calculating new forward sizes for %d objects!", MarkSweep::_rescued_oops->length());
-+
-+ for (int i=0; i<MarkSweep::_rescued_oops->length(); i++) {
-+ oop q = MarkSweep::_rescued_oops->at(i);
-+
-+ /* size_t size = oop(q)->size(); changing this for cms for perm gen */
-+ size_t size = block_size((HeapWord*)q);
-+
-+ size_t forward_size = size;
-+
-+ // (tw) There is a new version of the class of q => different size
-+ if (oop(q)->blueprint()->new_version() != NULL) {
-+
-+ size_t new_size = oop(q)->size_given_klass(oop(q)->blueprint()->new_version()->klass_part());
-+ assert(size != new_size || oop(q)->is_perm(), "instances without changed size have to be updated prior to GC run");
-+ forward_size = new_size;
-+ }
-+
-+ compact_top = cp->space->forward(oop(q), forward_size, cp, compact_top);
-+ assert(compact_top <= t, "must not write over end of space!");
-+ }
-+ MarkSweep::_rescued_oops->clear();
-+ MarkSweep::_rescued_oops = NULL;
-+ }
-+ //////////////////////////////////////////////////////////////////////////
-+
-+ assert(q == t, "just checking");
-+ if (liveRange != NULL) {
-+ liveRange->set_end(q);
-+ }
-+ _end_of_live = end_of_live;
-+ if (end_of_live < first_dead) {
-+ first_dead = end_of_live;
-+ }
-+ _first_dead = first_dead;
-+
-+// FIXME: idubrov
-+// if (_first_dead > top()) {
-+// _first_dead = top();
-+// }
-+//
-+// if (_end_of_live > top()) {
-+// _end_of_live = top();
-+// }
-+ assert(_first_dead <= top(), "Must be smaller equal");
-+ assert(_end_of_live <= top(), "Must be smaller equal");
-+
-+ /* save the compaction_top of the compaction space. */
-+ cp->space->set_compaction_top(compact_top);
- }
-
- void Space::adjust_pointers() {
-@@ -490,17 +716,313 @@
- assert(q == t, "just checking");
- }
-
-+
-+#ifdef ASSERT
-+
-+int CompactibleSpace::space_index(oop obj) {
-+ GenCollectedHeap* heap = GenCollectedHeap::heap();
-+
-+ if (heap->is_in_permanent(obj)) {
-+ return -1;
-+ }
-+
-+ int index = 0;
-+ for (int i = heap->n_gens() - 1; i >= 0; i--) {
-+ Generation* gen = heap->get_gen(i);
-+ CompactibleSpace* space = gen->first_compaction_space();
-+ while (space != NULL) {
-+ if (space->is_in_reserved(obj)) {
-+ return index;
-+ }
-+ space = space->next_compaction_space();
-+ index++;
-+ }
-+ }
-+
-+ tty->print_cr("could not compute space_index for %08xh", obj);
-+ index = 0;
-+ for (int i = heap->n_gens() - 1; i >= 0; i--) {
-+ Generation* gen = heap->get_gen(i);
-+ tty->print_cr(" generation %s: %08xh - %08xh", gen->name(), gen->reserved().start(), gen->reserved().end());
-+
-+ CompactibleSpace* space = gen->first_compaction_space();
-+ while (space != NULL) {
-+ tty->print_cr(" %2d space %08xh - %08xh", index, space->bottom(), space->end());
-+ space = space->next_compaction_space();
-+ index++;
-+ }
-+ }
-+
-+ ShouldNotReachHere();
-+ return 0;
-+}
-+#endif
-+
-+bool CompactibleSpace::must_rescue(oop old_obj, oop new_obj) {
-+
-+ assert(is_in_reserved(old_obj), "old_obj must be in this space");
-+
-+ if (old_obj->is_perm()) {
-+ // This object is in perm gen; check for invariant obj->klass() <= obj
-+ if (oop(old_obj)->blueprint()->new_version() != NULL) {
-+ return true;
-+ }
-+ }
-+
-+ int size = old_obj->size();
-+ int original_size = size;
-+ if (oop(old_obj)->blueprint()->is_redefining()) {
-+ assert(oop(old_obj)->blueprint()->old_version() != NULL, "must not be null");
-+ original_size = oop(old_obj)->size_given_klass(oop(old_obj)->blueprint()->old_version()->klass_part());
-+ } else if (oop(old_obj)->blueprint()->new_version() != NULL) {
-+ size = oop(old_obj)->size_given_klass(oop(old_obj)->blueprint()->new_version()->klass_part());
-+ }
-+
-+ bool normalComparison = (old_obj + original_size < new_obj + size);
-+
-+ if (is_in_reserved(new_obj)) {
-+ // Old and new address are in same space, so just compare the address.
-+ // Must rescue if object moves towards the top of the space.
-+ assert(space_index(old_obj) == space_index(new_obj), "old_obj and new_obj must be in same space");
-+ return normalComparison;
-+
-+ } else {
-+
-+ assert(space_index(old_obj) != space_index(new_obj), "old_obj and new_obj must be in different spaces");
-+
-+ Generation* tenured_gen = GenCollectedHeap::heap()->get_gen(1);
-+ if (tenured_gen->is_in_reserved(new_obj)) {
-+ // Must never rescue when moving from the new into the old generation.
-+ assert(GenCollectedHeap::heap()->get_gen(0)->is_in_reserved(old_obj), "old_obj must be in DefNewGeneration");
-+ assert(space_index(old_obj) > space_index(new_obj), "must be");
-+ return false;
-+
-+ } else if (tenured_gen->is_in_reserved(old_obj)) {
-+ // Must always rescue when moving from the old into the new generation.
-+ assert(GenCollectedHeap::heap()->get_gen(0)->is_in_reserved(new_obj), "new_obj must be in DefNewGeneration");
-+ assert(space_index(old_obj) < space_index(new_obj), "must be");
-+ return true;
-+
-+ } else {
-+ // In the new generation, eden is located before the from space, so a
-+ // simple pointer comparison is sufficient.
-+ assert(GenCollectedHeap::heap()->get_gen(0)->is_in_reserved(old_obj), "old_obj must be in DefNewGeneration");
-+ assert(GenCollectedHeap::heap()->get_gen(0)->is_in_reserved(new_obj), "new_obj must be in DefNewGeneration");
-+ assert((normalComparison) == (space_index(old_obj) < space_index(new_obj)), "slow and fast computation must yield same result");
-+ return normalComparison;
-+ }
-+ }
-+}
-+
-+oop CompactibleSpace::rescue(oop old_obj) {
-+ assert(must_rescue(old_obj, old_obj->forwardee()), "do not call otherwise");
-+
-+ int size = old_obj->size();
-+ oop rescued_obj = (oop)resource_allocate_bytes(size * HeapWordSize);
-+ Copy::aligned_disjoint_words((HeapWord*)old_obj, (HeapWord*)rescued_obj, size);
-+
-+ if (MarkSweep::_rescued_oops == NULL) {
-+ MarkSweep::_rescued_oops = new GrowableArray<oop>(128);
-+ }
-+
-+ MarkSweep::_rescued_oops->append(rescued_obj);
-+ return rescued_obj;
-+}
-+
- void CompactibleSpace::adjust_pointers() {
- // Check first is there is any work to do.
- if (used() == 0) {
- return; // Nothing to do.
- }
-+ /* adjust all the interior pointers to point at the new locations of objects
-+ * Used by MarkSweep::mark_sweep_phase3() */
-
-- SCAN_AND_ADJUST_POINTERS(adjust_obj_size);
-+ HeapWord* q = bottom();
-+ HeapWord* t = _end_of_live; /* Established by "prepare_for_compaction". */
-+
-+ assert(_first_dead <= _end_of_live, "Stands to reason, no?");
-+
-+ debug_only(HeapWord* prev_q = NULL);
-+ debug_only(HeapWord* prev_prev_q = NULL);
-+ debug_only(HeapWord* prev_prev_prev_q = NULL);
-+ if (q < t && _first_dead > q &&
-+ !oop(q)->is_gc_marked()) {
-+ /* we have a chunk of the space which hasn't moved and we've
-+ * reinitialized the mark word during the previous pass, so we can't
-+ * use is_gc_marked for the traversal. */
-+ HeapWord* end = _first_dead;
-+
-+ while (q < end) {
-+ /* I originally tried to conjoin "block_start(q) == q" to the
-+ * assertion below, but that doesn't work, because you can't
-+ * accurately traverse previous objects to get to the current one
-+ * after their pointers (including pointers into permGen) have been
-+ * updated, until the actual compaction is done. dld, 4/00 */
-+ assert(block_is_obj(q),
-+ "should be at block boundaries, and should be looking at objs");
-+
-+ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::track_interior_pointers(oop(q)));
-+
-+ /* point all the oops to the new location */
-+ size_t size = oop(q)->adjust_pointers();
-+ size = adjust_obj_size(size);
-+
-+ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::check_interior_pointers());
-+ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::validate_live_oop(oop(q), size));
-+
-+ debug_only(prev_prev_prev_q = prev_prev_q);
-+ debug_only(prev_prev_q = prev_q);
-+ debug_only(prev_q = q);
-+ q += size;
-+ }
-+
-+ // (tw) first_dead can be live object!
-+ q = _first_dead;
-+
-+// if (_first_dead == t) {
-+// q = t;
-+// } else {
-+// /* $$$ This is funky. Using this to read the previously written
-+// * LiveRange. See also use below. */
-+// q = (HeapWord*)oop(_first_dead)->mark()->decode_pointer();
-+// }
-+ }
-+
-+ const intx interval = PrefetchScanIntervalInBytes;
-+
-+ debug_only(prev_q = NULL);
-+ debug_only(prev_prev_q = NULL);
-+ debug_only(prev_prev_prev_q = NULL);
-+ while (q < t) {
-+ /* prefetch beyond q */
-+ Prefetch::write(q, interval);
-+ if (oop(q)->is_gc_marked()) {
-+ /* q is alive */
-+ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::track_interior_pointers(oop(q)));
-+ /* point all the oops to the new location */
-+ size_t size = oop(q)->adjust_pointers();
-+ size = adjust_obj_size(size);
-+ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::check_interior_pointers());
-+ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::validate_live_oop(oop(q), size));
-+ debug_only(prev_prev_prev_q = prev_prev_q);
-+ debug_only(prev_prev_q = prev_q);
-+ debug_only(prev_q = q);
-+ q += size;
-+ } else {
-+ /* q is not a live object, so its mark should point at the next
-+ * live object */
-+ debug_only(prev_prev_prev_q = prev_prev_q);
-+ debug_only(prev_prev_q = prev_q);
-+ debug_only(prev_q = q);
-+ q = (HeapWord*) oop(q)->mark()->decode_pointer();
-+ assert(q > prev_q, "we should be moving forward through memory");
-+ }
-+ }
-+
-+ assert(q == t, "just checking");
- }
-
- void CompactibleSpace::compact() {
-- SCAN_AND_COMPACT(obj_size);
-+
-+ if(!Universe::is_redefining_gc_run()) {
-+ SCAN_AND_COMPACT(obj_size);
-+ return;
-+ }
-+
-+ /* Copy all live objects to their new location
-+ * Used by MarkSweep::mark_sweep_phase4() */
-+
-+ HeapWord* q = bottom();
-+ HeapWord* const t = _end_of_live;
-+ debug_only(HeapWord* prev_q = NULL);
-+
-+ if (q < t && _first_dead > q &&
-+ !oop(q)->is_gc_marked()) {
-+ debug_only(
-+ /* we have a chunk of the space which hasn't moved and we've reinitialized
-+ * the mark word during the previous pass, so we can't use is_gc_marked for
-+ * the traversal. */
-+ HeapWord* const end = _first_dead;
-+
-+ while (q < end) {
-+ size_t size = obj_size(q); // FIXME: idubrov oop(q)->size();
-+ assert(!oop(q)->is_gc_marked(),
-+ "should be unmarked (special dense prefix handling)");
-+ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::live_oop_moved_to(q, size, q));
-+ debug_only(prev_q = q);
-+ q += size;
-+ }
-+ ) /* debug_only */
-+ // (tw) first_dead can be live object!
-+ q = _first_dead;
-+
-+ //if (_first_dead == t) {
-+ // q = t;
-+ //} else {
-+ ///* $$$ Funky */
-+ //q = (HeapWord*) oop(_first_dead)->mark()->decode_pointer();
-+ //}
-+ }
-+
-+ const intx scan_interval = PrefetchScanIntervalInBytes;
-+ const intx copy_interval = PrefetchCopyIntervalInBytes;
-+ while (q < t) {
-+ if (!oop(q)->is_gc_marked()) {
-+ /* mark is pointer to next marked oop */
-+ debug_only(prev_q = q);
-+ q = (HeapWord*) oop(q)->mark()->decode_pointer();
-+ assert(q > prev_q, "we should be moving forward through memory");
-+ } else {
-+ /* prefetch beyond q */
-+ Prefetch::read(q, scan_interval);
-+
-+ /* size and destination */
-+ size_t size = obj_size(q);
-+ HeapWord* compaction_top = (HeapWord*)oop(q)->forwardee();
-+
-+ if (must_rescue(oop(q), oop(q)->forwardee())) {
-+ oop dest_obj = rescue(oop(q));
-+ debug_only(Copy::fill_to_words(q, size, 0));
-+ } else {
-+
-+ /* prefetch beyond compaction_top */
-+ Prefetch::write(compaction_top, copy_interval);
-+
-+ /* copy object and reinit its mark */
-+ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::live_oop_moved_to(q, size,
-+ compaction_top));
-+ assert(q != compaction_top || oop(q)->blueprint()->new_version() != NULL, "everything in this pass should be moving");
-+
-+ if (oop(q)->blueprint()->new_version() != NULL) {
-+ MarkSweep::update_fields(oop(q), oop(compaction_top));
-+ } else {
-+ Copy::aligned_conjoint_words(q, compaction_top, size);
-+ }
-+ oop(compaction_top)->init_mark();
-+ assert(oop(compaction_top)->klass() != NULL, "should have a class");
-+ }
-+
-+ debug_only(prev_q = q);
-+ q += size;
-+ }
-+ }
-+
-+ /* Let's remember if we were empty before we did the compaction. */
-+ bool was_empty = used_region().is_empty();
-+ /* Reset space after compaction is complete */
-+ reset_after_compaction();
-+ /* We do this clear, below, since it has overloaded meanings for some */
-+ /* space subtypes. For example, OffsetTableContigSpace's that were */
-+ /* compacted into will have had their offset table thresholds updated */
-+ /* continuously, but those that weren't need to have their thresholds */
-+ /* re-initialized. Also mangles unused area for debugging. */
-+ if (used_region().is_empty()) {
-+ if (!was_empty) clear(SpaceDecorator::Mangle);
-+ } else {
-+ if (ZapUnusedHeapArea) mangle_unused_area();
-+ }
-+
-+ //SCAN_AND_COMPACT(obj_size);
- }
-
- void Space::print_short() const { print_short_on(tty); }
-diff --git a/src/share/vm/memory/space.hpp b/src/share/vm/memory/space.hpp
-index ef2f2c6..b54d470 100644
---- a/src/share/vm/memory/space.hpp
-+++ b/src/share/vm/memory/space.hpp
-@@ -445,6 +445,9 @@
- // indicates when the next such action should be taken.
- virtual void prepare_for_compaction(CompactPoint* cp);
- // MarkSweep support phase3
-+ DEBUG_ONLY(int space_index(oop obj));
-+ bool must_rescue(oop old_obj, oop new_obj);
-+ oop rescue(oop old_obj);
- virtual void adjust_pointers();
- // MarkSweep support phase4
- virtual void compact();
-@@ -475,6 +478,10 @@
- virtual HeapWord* forward(oop q, size_t size, CompactPoint* cp,
- HeapWord* compact_top);
-
-+ // (tw)
-+ virtual HeapWord* forward_compact_top(size_t size, CompactPoint* cp,
-+ HeapWord* compact_top);
-+
- // Return a size with adjusments as required of the space.
- virtual size_t adjust_object_size_v(size_t size) const { return size; }
-
-diff --git a/src/share/vm/memory/universe.cpp b/src/share/vm/memory/universe.cpp
-index 4030d9d..da9a186 100644
---- a/src/share/vm/memory/universe.cpp
-+++ b/src/share/vm/memory/universe.cpp
-@@ -100,6 +100,8 @@
- #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
- #endif
-
-+bool Universe::_is_redefining_gc_run = false;
-+
- // Known objects
- klassOop Universe::_boolArrayKlassObj = NULL;
- klassOop Universe::_byteArrayKlassObj = NULL;
-@@ -204,6 +206,38 @@
- f(systemObjArrayKlassObj());
- }
-
-+// DCEVM: This method should iterate all pointers that are not within heap objects.
-+void Universe::root_oops_do(OopClosure *oopClosure) {
-+
-+ class AlwaysTrueClosure: public BoolObjectClosure {
-+ public:
-+ void do_object(oop p) { ShouldNotReachHere(); }
-+ bool do_object_b(oop p) { return true; }
-+ };
-+ AlwaysTrueClosure always_true;
-+
-+ // General strong roots
-+ Universe::oops_do(oopClosure);
-+ JNIHandles::oops_do(oopClosure);
-+ Threads::oops_do(oopClosure, NULL);
-+ ObjectSynchronizer::oops_do(oopClosure);
-+ FlatProfiler::oops_do(oopClosure);
-+ //Management::oops_do(oopClosure); // DCEVM: TODO: Check if this is correct?
-+ JvmtiExport::oops_do(oopClosure);
-+ // SO_AllClasses
-+ SystemDictionary::oops_do(oopClosure);
-+
-+ // Now adjust pointers in remaining weak roots. (All of which should
-+ // have been cleared if they pointed to non-surviving objects.)
-+ // Global (weak) JNI handles
-+ JNIHandles::weak_oops_do(&always_true, oopClosure);
-+
-+ CodeCache::oops_do(oopClosure);
-+ StringTable::oops_do(oopClosure);
-+ //ref_processor()->weak_oops_do(&oopClosure); // DCEVM: TODO: Check if this is correct?
-+ //PSScavenge::reference_processor()->weak_oops_do(&oopClosure); // DCEVM: TODO: Check if this is correct?
-+}
-+
- void Universe::oops_do(OopClosure* f, bool do_all) {
-
- f->do_oop((oop*) &_int_mirror);
-diff --git a/src/share/vm/memory/universe.hpp b/src/share/vm/memory/universe.hpp
-index 50fcb62..afb6b33 100644
---- a/src/share/vm/memory/universe.hpp
-+++ b/src/share/vm/memory/universe.hpp
-@@ -127,6 +127,8 @@
- friend class SystemDictionary;
- friend class VMStructs;
- friend class CompactingPermGenGen;
-+ friend class Space;
-+ friend class ContiguousSpace;
- friend class VM_PopulateDumpSharedSpace;
-
- friend jint universe_init();
-@@ -258,7 +260,18 @@
-
- static void compute_verify_oop_data();
-
-+ static bool _is_redefining_gc_run;
-+
- public:
-+
-+ static bool is_redefining_gc_run() {
-+ return _is_redefining_gc_run;
-+ }
-+
-+ static void set_redefining_gc_run(bool b) {
-+ _is_redefining_gc_run = b;
-+ }
-+
- // Known classes in the VM
- static klassOop boolArrayKlassObj() { return _boolArrayKlassObj; }
- static klassOop byteArrayKlassObj() { return _byteArrayKlassObj; }
-@@ -403,6 +416,8 @@
-
- // Iteration
-
-+ static void root_oops_do(OopClosure *f);
-+
- // Apply "f" to the addresses of all the direct heap pointers maintained
- // as static fields of "Universe".
- static void oops_do(OopClosure* f, bool do_all = false);
-@@ -419,6 +434,7 @@
-
- // Debugging
- static bool verify_in_progress() { return _verify_in_progress; }
-+ static void set_verify_in_progress(bool b) { _verify_in_progress = b; }
- static void verify(VerifyOption option, const char* prefix, bool silent = VerifySilently);
- static void verify(const char* prefix, bool silent = VerifySilently) {
- verify(VerifyOption_Default, prefix, silent);
-diff --git a/src/share/vm/oops/arrayKlass.cpp b/src/share/vm/oops/arrayKlass.cpp
-index 16142b8..921e546 100644
---- a/src/share/vm/oops/arrayKlass.cpp
-+++ b/src/share/vm/oops/arrayKlass.cpp
-@@ -136,9 +136,9 @@
-
- bool arrayKlass::compute_is_subtype_of(klassOop k) {
- // An array is a subtype of Serializable, Clonable, and Object
-- return k == SystemDictionary::Object_klass()
-- || k == SystemDictionary::Cloneable_klass()
-- || k == SystemDictionary::Serializable_klass();
-+ return k->klass_part()->newest_version() == SystemDictionary::Object_klass()->klass_part()->newest_version()
-+ || k->klass_part()->newest_version() == SystemDictionary::Cloneable_klass()->klass_part()->newest_version()
-+ || k->klass_part()->newest_version() == SystemDictionary::Serializable_klass()->klass_part()->newest_version();
- }
-
-
-diff --git a/src/share/vm/oops/constMethodKlass.cpp b/src/share/vm/oops/constMethodKlass.cpp
-index e74811f..be3fe7d 100644
---- a/src/share/vm/oops/constMethodKlass.cpp
-+++ b/src/share/vm/oops/constMethodKlass.cpp
-@@ -102,6 +102,7 @@
- constMethodOop cm = constMethodOop(obj);
- MarkSweep::mark_and_push(cm->adr_constants());
- MarkSweep::mark_and_push(cm->adr_stackmap_data());
-+ MarkSweep::mark_and_push(cm->adr_code_section_table());
- // Performance tweak: We skip iterating over the klass pointer since we
- // know that Universe::constMethodKlassObj never moves.
- }
-@@ -113,6 +114,7 @@
- constMethodOop cm_oop = constMethodOop(obj);
- PSParallelCompact::mark_and_push(cm, cm_oop->adr_constants());
- PSParallelCompact::mark_and_push(cm, cm_oop->adr_stackmap_data());
-+ PSParallelCompact::mark_and_push(cm, cm_oop->adr_code_section_table());
- // Performance tweak: We skip iterating over the klass pointer since we
- // know that Universe::constMethodKlassObj never moves.
- }
-@@ -123,6 +125,7 @@
- constMethodOop cm = constMethodOop(obj);
- blk->do_oop(cm->adr_constants());
- blk->do_oop(cm->adr_stackmap_data());
-+ blk->do_oop(cm->adr_code_section_table());
- // Get size before changing pointers.
- // Don't call size() or oop_size() since that is a virtual call.
- int size = cm->object_size();
-@@ -138,6 +141,8 @@
- if (mr.contains(adr)) blk->do_oop(adr);
- adr = cm->adr_stackmap_data();
- if (mr.contains(adr)) blk->do_oop(adr);
-+ adr = cm->adr_code_section_table();
-+ if (mr.contains(adr)) blk->do_oop(adr);
- // Get size before changing pointers.
- // Don't call size() or oop_size() since that is a virtual call.
- int size = cm->object_size();
-@@ -152,6 +157,7 @@
- constMethodOop cm = constMethodOop(obj);
- MarkSweep::adjust_pointer(cm->adr_constants());
- MarkSweep::adjust_pointer(cm->adr_stackmap_data());
-+ MarkSweep::adjust_pointer(cm->adr_code_section_table());
- // Get size before changing pointers.
- // Don't call size() or oop_size() since that is a virtual call.
- int size = cm->object_size();
-diff --git a/src/share/vm/oops/constMethodOop.hpp b/src/share/vm/oops/constMethodOop.hpp
-index 549192b..5cea5c4 100644
---- a/src/share/vm/oops/constMethodOop.hpp
-+++ b/src/share/vm/oops/constMethodOop.hpp
-@@ -129,7 +129,7 @@
-
- public:
- oop* oop_block_beg() const { return adr_constants(); }
-- oop* oop_block_end() const { return adr_stackmap_data() + 1; }
-+ oop* oop_block_end() const { return adr_code_section_table() + 1; }
-
- private:
- //
-@@ -140,6 +140,9 @@
-
- // Raw stackmap data for the method
- typeArrayOop _stackmap_data;
-+
-+ // (tw) Table mapping code sections for method forward points.
-+ typeArrayOop _code_section_table;
-
- //
- // End of the oop block.
-@@ -194,6 +197,28 @@
- oop_store_without_check((oop*)&_stackmap_data, (oop)sd);
- }
- bool has_stackmap_table() const { return _stackmap_data != NULL; }
-+
-+ // code section table
-+ typeArrayOop code_section_table() const { return _code_section_table; }
-+ void set_code_section_table(typeArrayOop e) { oop_store_without_check((oop*) &_code_section_table, (oop) e); }
-+ bool has_code_section_table() const { return code_section_table() != NULL && code_section_table()->length() > 0; }
-+ static const int ValuesPerCodeSectionEntry = 3;
-+ int code_section_entries() const {
-+ if (!has_code_section_table()) return 0;
-+ return _code_section_table->length() / ValuesPerCodeSectionEntry;
-+ }
-+
-+ int code_section_new_index_at(int index) const {
-+ return _code_section_table->short_at(index * ValuesPerCodeSectionEntry);
-+ }
-+
-+ int code_section_original_index_at(int index) const {
-+ return _code_section_table->short_at(index * ValuesPerCodeSectionEntry + 1);
-+ }
-+
-+ int code_section_length_at(int index) const {
-+ return _code_section_table->short_at(index * ValuesPerCodeSectionEntry + 2);
-+ }
-
- void init_fingerprint() {
- const uint64_t initval = CONST64(0x8000000000000000);
-@@ -301,6 +326,7 @@
- // Garbage collection support
- oop* adr_constants() const { return (oop*)&_constants; }
- oop* adr_stackmap_data() const { return (oop*)&_stackmap_data; }
-+ oop* adr_code_section_table() const { return (oop*)&_code_section_table; }
- bool is_conc_safe() { return _is_conc_safe; }
- void set_is_conc_safe(bool v) { _is_conc_safe = v; }
-
-diff --git a/src/share/vm/oops/cpCacheOop.cpp b/src/share/vm/oops/cpCacheOop.cpp
-index ad62921..f39f202 100644
---- a/src/share/vm/oops/cpCacheOop.cpp
-+++ b/src/share/vm/oops/cpCacheOop.cpp
-@@ -37,9 +37,15 @@
-
- // Implememtation of ConstantPoolCacheEntry
-
-+void ConstantPoolCacheEntry::copy_from(ConstantPoolCacheEntry *other) {
-+ _flags = other->_flags; // flags
-+}
-+
- void ConstantPoolCacheEntry::initialize_entry(int index) {
- assert(0 < index && index < 0x10000, "sanity check");
- _indices = index;
-+ _f1 = NULL;
-+ _f2 = 0;
- assert(constant_pool_index() == index, "");
- }
-
-@@ -162,7 +168,8 @@
- int vtable_index) {
- assert(!is_secondary_entry(), "");
- assert(method->interpreter_entry() != NULL, "should have been set at this point");
-- assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache");
-+ // (tw) No longer valid assert
-+ //assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache");
-
- int byte_no = -1;
- bool change_to_virtual = false;
-@@ -183,6 +190,7 @@
- set_method_flags(as_TosState(method->result_type()),
- ( 1 << is_vfinal_shift) |
- ((method->is_final_method() ? 1 : 0) << is_final_shift) |
-+ ((method->is_old() ? 1 : 0) << is_old_method_shift) |
- ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift),
- method()->size_of_parameters());
- set_f2_as_vfinal_method(method());
-@@ -190,9 +198,13 @@
- assert(vtable_index >= 0, "valid index");
- assert(!method->is_final_method(), "sanity");
- set_method_flags(as_TosState(method->result_type()),
-+ ((method->is_old() ? 1 : 0) << is_old_method_shift) |
- ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift),
- method()->size_of_parameters());
- set_f2(vtable_index);
-+
-+ // (tw) save method holder in f1 for virtual calls
-+ set_f1(method());
- }
- byte_no = 2;
- break;
-@@ -206,7 +218,8 @@
- // Once is_vfinal is set, it must stay that way, lest we get a dangling oop.
- set_method_flags(as_TosState(method->result_type()),
- ((is_vfinal() ? 1 : 0) << is_vfinal_shift) |
-- ((method->is_final_method() ? 1 : 0) << is_final_shift),
-+ ((method->is_final_method() ? 1 : 0) << is_final_shift) |
-+ ((method->is_old() ? 1 : 0) << is_old_method_shift),
- method()->size_of_parameters());
- set_f1(method());
- byte_no = 1;
-@@ -259,7 +272,7 @@
- set_f1(interf);
- set_f2(index);
- set_method_flags(as_TosState(method->result_type()),
-- 0, // no option bits
-+ ((method->is_old() ? 1 : 0) << is_old_method_shift),
- method()->size_of_parameters());
- set_bytecode_1(Bytecodes::_invokeinterface);
- }
-@@ -520,27 +533,12 @@
- // If this constantPoolCacheEntry refers to old_method then update it
- // to refer to new_method.
- bool ConstantPoolCacheEntry::adjust_method_entry(methodOop old_method,
-- methodOop new_method, bool * trace_name_printed) {
-+ methodOop new_method) {
-
- if (is_vfinal()) {
-- // virtual and final so _f2 contains method ptr instead of vtable index
-- if (f2_as_vfinal_method() == old_method) {
-- // match old_method so need an update
-- // NOTE: can't use set_f2_as_vfinal_method as it asserts on different values
-- _f2 = (intptr_t)new_method;
-- if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
-- if (!(*trace_name_printed)) {
-- // RC_TRACE_MESG macro has an embedded ResourceMark
-- RC_TRACE_MESG(("adjust: name=%s",
-- Klass::cast(old_method->method_holder())->external_name()));
-- *trace_name_printed = true;
-- }
-- // RC_TRACE macro has an embedded ResourceMark
-- RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)",
-- new_method->name()->as_C_string(),
-- new_method->signature()->as_C_string()));
-- }
--
-+ // virtual and final so f2() contains method ptr instead of vtable index
-+ if (f2_as_vfinal_method() != NULL && f2_as_vfinal_method()->method_holder()->klass_part()->new_version()) {
-+ initialize_entry(constant_pool_index());
- return true;
- }
-
-@@ -548,82 +546,25 @@
- return false;
- }
-
-- if ((oop)_f1 == NULL) {
-- // NULL f1() means this is a virtual entry so bail out
-- // We are assuming that the vtable index does not need change.
-+ // (tw) check how to update interface methods!
-+ if (bytecode_1() == Bytecodes::_invokevirtual || bytecode_2() == Bytecodes::_invokevirtual) {
-+
-+ if(f1_as_method()->method_holder()->klass_part()->new_version()) {
-+ initialize_entry(constant_pool_index());
-+ return true;
-+ }
-+
- return false;
- }
-
- if ((oop)_f1 == old_method) {
- _f1 = new_method;
-- if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
-- if (!(*trace_name_printed)) {
-- // RC_TRACE_MESG macro has an embedded ResourceMark
-- RC_TRACE_MESG(("adjust: name=%s",
-- Klass::cast(old_method->method_holder())->external_name()));
-- *trace_name_printed = true;
-- }
-- // RC_TRACE macro has an embedded ResourceMark
-- RC_TRACE(0x00400000, ("cpc entry update: %s(%s)",
-- new_method->name()->as_C_string(),
-- new_method->signature()->as_C_string()));
-- }
--
- return true;
-+ } else if(_f1 != NULL && (bytecode_1() != Bytecodes::_invokeinterface && f1_as_method()->method_holder()->klass_part()->new_version())) {
-+ initialize_entry(constant_pool_index());
- }
-
- return false;
--}
--
--// a constant pool cache entry should never contain old or obsolete methods
--bool ConstantPoolCacheEntry::check_no_old_or_obsolete_entries() {
-- if (is_vfinal()) {
-- // virtual and final so _f2 contains method ptr instead of vtable index
-- methodOop m = (methodOop)_f2;
-- // Return false if _f2 refers to an old or an obsolete method.
-- // _f2 == NULL || !m->is_method() are just as unexpected here.
-- return (m != NULL && m->is_method() && !m->is_old() && !m->is_obsolete());
-- } else if ((oop)_f1 == NULL || !((oop)_f1)->is_method()) {
-- // _f1 == NULL || !_f1->is_method() are OK here
-- return true;
-- }
--
-- methodOop m = (methodOop)_f1;
-- // return false if _f1 refers to an old or an obsolete method
-- return (!m->is_old() && !m->is_obsolete());
--}
--
--bool ConstantPoolCacheEntry::is_interesting_method_entry(klassOop k) {
-- if (!is_method_entry()) {
-- // not a method entry so not interesting by default
-- return false;
-- }
--
-- methodOop m = NULL;
-- if (is_vfinal()) {
-- // virtual and final so _f2 contains method ptr instead of vtable index
-- m = f2_as_vfinal_method();
-- } else if (is_f1_null()) {
-- // NULL _f1 means this is a virtual entry so also not interesting
-- return false;
-- } else {
-- oop f1 = _f1; // _f1 is volatile
-- if (!f1->is_method()) {
-- // _f1 can also contain a klassOop for an interface
-- return false;
-- }
-- m = f1_as_method();
-- }
--
-- assert(m != NULL && m->is_method(), "sanity check");
-- if (m == NULL || !m->is_method() || (k != NULL && m->method_holder() != k)) {
-- // robustness for above sanity checks or method is not in
-- // the interesting class
-- return false;
-- }
--
-- // the method is in the interesting class so the entry is interesting
-- return true;
- }
-
- void ConstantPoolCacheEntry::print(outputStream* st, int index) const {
-@@ -663,60 +604,18 @@
- }
- }
-
--// RedefineClasses() API support:
--// If any entry of this constantPoolCache points to any of
--// old_methods, replace it with the corresponding new_method.
--void constantPoolCacheOopDesc::adjust_method_entries(methodOop* old_methods, methodOop* new_methods,
-- int methods_length, bool * trace_name_printed) {
--
-- if (methods_length == 0) {
-- // nothing to do if there are no methods
-- return;
-- }
--
-- // get shorthand for the interesting class
-- klassOop old_holder = old_methods[0]->method_holder();
-+void constantPoolCacheOopDesc::adjust_entries(methodOop* old_methods, methodOop* new_methods,
-+ int methods_length) {
-
- for (int i = 0; i < length(); i++) {
-- if (!entry_at(i)->is_interesting_method_entry(old_holder)) {
-- // skip uninteresting methods
-- continue;
-- }
--
-- // The constantPoolCache contains entries for several different
-- // things, but we only care about methods. In fact, we only care
-- // about methods in the same class as the one that contains the
-- // old_methods. At this point, we have an interesting entry.
--
-- for (int j = 0; j < methods_length; j++) {
-- methodOop old_method = old_methods[j];
-- methodOop new_method = new_methods[j];
--
-- if (entry_at(i)->adjust_method_entry(old_method, new_method,
-- trace_name_printed)) {
-- // current old_method matched this entry and we updated it so
-- // break out and get to the next interesting entry if there one
-- break;
-- }
-+ if (entry_at(i)->is_field_entry()) {
-+ // (tw) TODO: Update only field offsets and modify only constant pool entries that
-+ // point to changed fields
-+ entry_at(i)->initialize_entry(entry_at(i)->constant_pool_index());
-+ } else if(entry_at(i)->is_method_entry()) {
-+ entry_at(i)->adjust_method_entry(NULL, NULL);
- }
- }
- }
-
--// the constant pool cache should never contain old or obsolete methods
--bool constantPoolCacheOopDesc::check_no_old_or_obsolete_entries() {
-- for (int i = 1; i < length(); i++) {
-- if (entry_at(i)->is_interesting_method_entry(NULL) &&
-- !entry_at(i)->check_no_old_or_obsolete_entries()) {
-- return false;
-- }
-- }
-- return true;
--}
-
--void constantPoolCacheOopDesc::dump_cache() {
-- for (int i = 1; i < length(); i++) {
-- if (entry_at(i)->is_interesting_method_entry(NULL)) {
-- entry_at(i)->print(tty, i);
-- }
-- }
--}
-diff --git a/src/share/vm/oops/cpCacheOop.hpp b/src/share/vm/oops/cpCacheOop.hpp
-index b9107cd..653ab13 100644
---- a/src/share/vm/oops/cpCacheOop.hpp
-+++ b/src/share/vm/oops/cpCacheOop.hpp
-@@ -136,7 +136,8 @@
- void set_bytecode_2(Bytecodes::Code code);
- void set_f1(oop f1) {
- oop existing_f1 = _f1; // read once
-- assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change");
-+ // (tw) need to relax assertion for redefinition
-+ // assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change");
- oop_store(&_f1, f1);
- }
- void release_set_f1(oop f1);
-@@ -174,6 +175,7 @@
- tos_state_mask = right_n_bits(tos_state_bits),
- tos_state_shift = BitsPerInt - tos_state_bits, // see verify_tos_state_shift below
- // misc. option bits; can be any bit position in [16..27]
-+ is_old_method_shift = 19,
- is_vfinal_shift = 20,
- is_volatile_shift = 21,
- is_final_shift = 22,
-@@ -206,6 +208,8 @@
- // Initialization
- void initialize_entry(int original_index); // initialize primary entry
- void initialize_secondary_entry(int main_index); // initialize secondary entry
-+
-+ void copy_from(ConstantPoolCacheEntry *other);
-
- void set_field( // sets entry to resolved field state
- Bytecodes::Code get_code, // the bytecode used for reading the field
-@@ -368,10 +372,7 @@
- // trace_name_printed is set to true if the current call has
- // printed the klass name so that other routines in the adjust_*
- // group don't print the klass name.
-- bool adjust_method_entry(methodOop old_method, methodOop new_method,
-- bool * trace_name_printed);
-- bool check_no_old_or_obsolete_entries();
-- bool is_interesting_method_entry(klassOop k);
-+ bool adjust_method_entry(methodOop old_method, methodOop new_method);
-
- // Debugging & Printing
- void print (outputStream* st, int index) const;
-@@ -492,16 +493,9 @@
- return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index);
- }
-
-- // RedefineClasses() API support:
-- // If any entry of this constantPoolCache points to any of
-- // old_methods, replace it with the corresponding new_method.
-- // trace_name_printed is set to true if the current call has
-- // printed the klass name so that other routines in the adjust_*
-- // group don't print the klass name.
-- void adjust_method_entries(methodOop* old_methods, methodOop* new_methods,
-- int methods_length, bool * trace_name_printed);
-- bool check_no_old_or_obsolete_entries();
-- void dump_cache();
-+ // (tw) Update method and field references
-+ void adjust_entries(methodOop* old_methods, methodOop* new_methods,
-+ int methods_length);
- };
-
- #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP
-diff --git a/src/share/vm/oops/instanceKlass.cpp b/src/share/vm/oops/instanceKlass.cpp
-index a775b02..749458f 100644
---- a/src/share/vm/oops/instanceKlass.cpp
-+++ b/src/share/vm/oops/instanceKlass.cpp
-@@ -250,12 +250,118 @@
- }
-
-
-+void instanceKlass::initialize_redefined_class() {
-+ RC_TRACE(0x00000400, ("initializing redefined class %s",
-+ name()->as_C_string()));
-+
-+ assert(!is_initialized(), "");
-+ assert(this->old_version() != NULL, "");
-+ assert(is_linked(), "must be linked before");
-+
-+
-+ instanceKlassHandle this_oop(Thread::current(), this->as_klassOop());
-+ class UpdateStaticFieldClosure : public FieldClosure {
-+
-+ private:
-+ instanceKlassHandle this_oop;
-+
-+ public:
-+ UpdateStaticFieldClosure(instanceKlassHandle this_oop) {
-+ this->this_oop = this_oop;
-+ }
-+
-+ virtual void do_field(fieldDescriptor* fd) {
-+ fieldDescriptor result;
-+ bool found = ((instanceKlass *)(this_oop->old_version()->klass_part()))->find_local_field(fd->name(), fd->signature(), &result);
-+
-+ if (found && result.is_static()) {
-+ int old_offset = result.offset();
-+ assert(result.field_type() == fd->field_type(), "Old and new field type does not match");
-+
-+ oop new_location = this_oop()->java_mirror();
-+ oop old_location = this_oop->old_version()->java_mirror();
-+ int offset = fd->offset();
-+ RC_TRACE(0x00000400, ("Copying static field value for field '%s' old_offset=%d new_offset=%d",
-+ fd->name()->as_C_string(), old_offset, offset));
-+
-+ oop cur_oop;
-+
-+ switch(result.field_type()) {
-+
-+ // Found static field with same name and type in the old klass => copy value from old to new klass
-+
-+ case T_BOOLEAN:
-+ new_location->bool_field_put(offset, old_location->bool_field(old_offset));
-+ DEBUG_ONLY(old_location->byte_field_put(old_offset, 0));
-+ break;
-+
-+ case T_CHAR:
-+ new_location->char_field_put(offset, old_location->char_field(old_offset));
-+ DEBUG_ONLY(old_location->char_field_put(old_offset, 0));
-+ break;
-+
-+ case T_FLOAT:
-+ new_location->float_field_put(offset, old_location->float_field(old_offset));
-+ DEBUG_ONLY(old_location->float_field_put(old_offset, 0));
-+ break;
-+
-+ case T_DOUBLE:
-+ new_location->double_field_put(offset, old_location->double_field(old_offset));
-+ DEBUG_ONLY(old_location->double_field_put(old_offset, 0));
-+ break;
-+
-+ case T_BYTE:
-+ new_location->byte_field_put(offset, old_location->byte_field(old_offset));
-+ DEBUG_ONLY(old_location->byte_field_put(old_offset, 0));
-+ break;
-+
-+ case T_SHORT:
-+ new_location->short_field_put(offset, old_location->short_field(old_offset));
-+ DEBUG_ONLY(old_location->short_field_put(old_offset, 0));
-+ break;
-+
-+ case T_INT:
-+ new_location->int_field_put(offset, old_location->int_field(old_offset));
-+ DEBUG_ONLY(old_location->int_field_put(old_offset, 0));
-+ break;
-+
-+ case T_LONG:
-+ new_location->long_field_put(offset, old_location->long_field(old_offset));
-+ DEBUG_ONLY(old_location->long_field_put(old_offset, 0));
-+ break;
-+
-+ case T_OBJECT:
-+ case T_ARRAY:
-+ cur_oop = old_location->obj_field(old_offset);
-+ new_location->obj_field_put_raw(offset, cur_oop);
-+ old_location->obj_field_put_raw(old_offset, NULL);
-+ break;
-+
-+ default:
-+ ShouldNotReachHere();
-+ }
-+ } else {
-+ RC_TRACE(0x00000200, ("New static field %s has_initial_value=%d",
-+ fd->name()->as_C_string(), (int)(fd->has_initial_value())));
-+ // field not found
-+ // (tw) TODO: Probably this call is not necessary here!
-+ // FIXME: idubrov
-+ //ClassFileParser::initialize_static_field(fd, Thread::current());
-+ }
-+ }
-+ };
-+
-+ UpdateStaticFieldClosure cl(this_oop);
-+ this->do_local_static_fields(&cl);
-+}
-+
-+
- bool instanceKlass::verify_code(
- instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS) {
- // 1) Verify the bytecodes
- Verifier::Mode mode =
- throw_verifyerror ? Verifier::ThrowException : Verifier::NoException;
-- return Verifier::verify(this_oop, mode, this_oop->should_verify_class(), CHECK_false);
-+ return Verifier::verify(this_oop, mode, this_oop->should_verify_class(), true, CHECK_false);
- }
-
-
-@@ -362,7 +468,13 @@
- jt->get_thread_stat()->perf_recursion_counts_addr(),
- jt->get_thread_stat()->perf_timers_addr(),
- PerfClassTraceTime::CLASS_VERIFY);
-- bool verify_ok = verify_code(this_oop, throw_verifyerror, THREAD);
-+ if (this_oop->is_redefining()) {
-+ Thread::current()->set_pretend_new_universe(true);
-+ }
-+ bool verify_ok = verify_code(this_oop, throw_verifyerror, THREAD);
-+ if (this_oop->is_redefining()) {
-+ Thread::current()->set_pretend_new_universe(false);
-+ }
- if (!verify_ok) {
- return false;
- }
-@@ -400,7 +512,8 @@
- }
- #endif
- this_oop->set_init_state(linked);
-- if (JvmtiExport::should_post_class_prepare()) {
-+ // (tw) Must check for old version in order to prevent infinite loops.
-+ if (JvmtiExport::should_post_class_prepare() && this_oop->old_version() == NULL /* JVMTI deadlock otherwise */) {
- Thread *thread = THREAD;
- assert(thread->is_Java_thread(), "thread->is_Java_thread()");
- JvmtiExport::post_class_prepare((JavaThread *) thread, this_oop());
-@@ -673,6 +786,18 @@
- return false;
- }
-
-+bool instanceKlass::implements_interface_any_version(klassOop k) const {
-+ k = k->klass_part()->newest_version();
-+ if (this->newest_version() == k) return true;
-+ assert(Klass::cast(k)->is_interface(), "should be an interface class");
-+ for (int i = 0; i < transitive_interfaces()->length(); i++) {
-+ if (((klassOop)transitive_interfaces()->obj_at(i))->klass_part()->newest_version() == k) {
-+ return true;
-+ }
-+ }
-+ return false;
-+}
-+
- objArrayOop instanceKlass::allocate_objArray(int n, int length, TRAPS) {
- if (length < 0) THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
- if (length > arrayOopDesc::max_array_length(T_OBJECT)) {
-@@ -801,7 +926,25 @@
- }
-
- void instanceKlass::call_class_initializer_impl(instanceKlassHandle this_oop, TRAPS) {
-+
-+ ResourceMark rm(THREAD);
- methodHandle h_method(THREAD, this_oop->class_initializer());
-+
-+ if (this_oop->revision_number() != -1){
-+ methodOop m = NULL;
-+ if (AllowAdvancedClassRedefinition) {
-+ m = this_oop->find_method(vmSymbols::static_transformer_name(), vmSymbols::void_method_signature());
-+ }
-+ methodHandle method(m);
-+ if (method() != NULL && method()->is_static()) {
-+ RC_TRACE(0x00000200, ("Calling static transformer instead of static initializer"));
-+ h_method = method;
-+ } else if (!((instanceKlass*)this_oop->old_version()->klass_part())->is_not_initialized()) {
-+ // Only execute the static initializer, if it was not yet executed for the old version of the class.
-+ return;
-+ }
-+ }
-+
- assert(!this_oop->is_initialized(), "we cannot initialize twice");
- if (TraceClassInitialization) {
- tty->print("%d Initializing ", call_class_initializer_impl_counter++);
-@@ -949,6 +1092,137 @@
- }
- }
-
-+void instanceKlass::store_update_information(GrowableArray<int> &values) {
-+ int *arr = NEW_C_HEAP_ARRAY(int, values.length(), mtClass);
-+ for (int i=0; i<values.length(); i++) {
-+ arr[i] = values.at(i);
-+ }
-+ set_update_information(arr);
-+}
-+
-+void instanceKlass::clear_update_information() {
-+ FREE_C_HEAP_ARRAY(int, update_information(), mtClass);
-+ set_update_information(NULL);
-+}
-+
-+typedef Pair<int, klassOop> typeInfoPair;
-+
-+void instanceKlass::store_type_check_information(GrowableArray< Pair<int, klassOop> > &values) {
-+ Pair<int, klassOop> *arr = NEW_C_HEAP_ARRAY(typeInfoPair, values.length(), mtClass);
-+ for (int i=0; i<values.length(); i++) {
-+ arr[i] = values.at(i);
-+ }
-+ set_type_check_information(arr);
-+}
-+
-+void instanceKlass::clear_type_check_information() {
-+ FREE_C_HEAP_ARRAY(typeInfoPair, type_check_information(), mtClass);
-+ set_type_check_information(NULL);
-+}
-+
-+void instanceKlass::do_fields_evolution(FieldEvolutionClosure* cl) {
-+
-+ assert (old_version() != NULL, "must have old version!");
-+
-+ klassOop old_klass_oop = old_version();
-+ instanceKlass *old_klass = instanceKlass::cast(old_klass_oop);
-+ instanceKlass *new_klass = this;
-+
-+ fieldDescriptor fd;
-+ fieldDescriptor old_fd;
-+
-+ instanceKlass *cur_new_klass = new_klass;
-+ klassOop cur_new_klass_oop = this->as_klassOop();
-+
-+ if (_fields_not_changed) {
-+
-+ class MyFieldClosure : public FieldClosure {
-+
-+ FieldEvolutionClosure *_cl;
-+ public:
-+ MyFieldClosure(FieldEvolutionClosure *cl) {_cl = cl; }
-+ virtual void do_field(fieldDescriptor* fd) {
-+ _cl->do_changed_field(fd, fd);
-+ }
-+ };
-+
-+ MyFieldClosure mfc(cl);
-+ do_nonstatic_fields(&mfc);
-+ } else {
-+
-+ _fields_not_changed = true;
-+ GrowableArray<fieldDescriptor> fds;
-+ while (true) {
-+ for (JavaFieldStream fs(cur_new_klass); !fs.done(); fs.next()) {
-+ fd.initialize(cur_new_klass_oop, fs.index());
-+ if (fd.is_static()) {
-+ continue;
-+ }
-+ fds.append(fd);
-+ }
-+
-+ if (cur_new_klass->super() != NULL) {
-+ cur_new_klass_oop = cur_new_klass->super();
-+ cur_new_klass = instanceKlass::cast(cur_new_klass_oop);
-+ } else {
-+ break;
-+ }
-+ }
-+
-+ GrowableArray<fieldDescriptor> sortedFds;
-+ while (fds.length() > 0) {
-+ int minOffset = 0x7fffffff;
-+ int minIndex = -1;
-+ for (int i=0; i<fds.length(); i++) {
-+ int curOffset = fds.adr_at(i)->offset();
-+ if (curOffset < minOffset) {
-+ minOffset = curOffset;
-+ minIndex = i;
-+ }
-+ }
-+
-+ sortedFds.append(fds.at(minIndex));
-+ fds.remove_at(minIndex);
-+ }
-+
-+
-+ for (int i=0; i<sortedFds.length(); i++) {
-+ fieldDescriptor &fd = *sortedFds.adr_at(i);
-+
-+ char found = 0;
-+ instanceKlass *cur_old_klass = old_klass;
-+ klassOop cur_old_klass_oop = old_klass_oop;
-+ while (true) {
-+ for (JavaFieldStream fs(cur_old_klass); !fs.done(); fs.next()) {
-+ old_fd.initialize(cur_old_klass_oop, fs.index());
-+ if (old_fd.is_static()) {
-+ continue;
-+ }
-+ if (old_fd.name() == fd.name() && old_fd.signature() == fd.signature()) {
-+ found = 1;
-+ break;
-+ }
-+ }
-+ if (!found && cur_old_klass->super()) {
-+ cur_old_klass_oop = cur_old_klass->super();
-+ cur_old_klass = instanceKlass::cast(cur_old_klass_oop);
-+ } else {
-+ break;
-+ }
-+ }
-+
-+ if (found) {
-+ if (old_fd.offset() != fd.offset()) {
-+ _fields_not_changed = false;
-+ }
-+ cl->do_changed_field(&old_fd, &fd);
-+ } else {
-+ _fields_not_changed = false;
-+ cl->do_new_field(&fd);
-+ }
-+ }
-+ }
-+}
-
- void instanceKlass::do_local_static_fields(FieldClosure* cl) {
- for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
-@@ -1368,6 +1642,20 @@
- return id;
- }
-
-+bool instanceKlass::update_jmethod_id(methodOop method, jmethodID newMethodID) {
-+ size_t idnum = (size_t)method->method_idnum();
-+ jmethodID* jmeths = methods_jmethod_ids_acquire();
-+ size_t length; // length assigned as debugging crumb
-+ jmethodID id = NULL;
-+ if (jmeths != NULL && // If there is a cache
-+ (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough,
-+ jmeths[idnum+1] = newMethodID; // Set the id (may be NULL)
-+ return true;
-+ }
-+
-+ return false;
-+}
-+
-
- // Cache an itable index
- void instanceKlass::set_cached_itable_index(size_t idnum, int index) {
-@@ -1527,6 +1815,13 @@
- last = b;
- b = b->next();
- }
-+
-+ // (tw) Hack as dependencies get wrong version of klassOop
-+ if(this->old_version() != NULL) {
-+ ((instanceKlass *)this->old_version()->klass_part())->remove_dependent_nmethod(nm);
-+ return;
-+ }
-+
- #ifdef ASSERT
- tty->print_cr("### %s can't find dependent nmethod:", this->external_name());
- nm->print();
-@@ -2417,6 +2712,9 @@
- klassOop mirrored_klass = java_lang_Class::as_klassOop(obj);
- st->print(BULLET"fake entry for mirror: ");
- mirrored_klass->print_value_on(st);
-+ if (mirrored_klass != NULL) {
-+ st->print_cr("revision: %d (oldest=%d, newest=%d)", mirrored_klass->klass_part()->revision_number(), mirrored_klass->klass_part()->oldest_version()->klass_part()->revision_number(), mirrored_klass->klass_part()->newest_version()->klass_part()->revision_number());
-+ }
- st->cr();
- st->print(BULLET"fake entry resolved_constructor: ");
- methodOop ctor = java_lang_Class::resolved_constructor(obj);
-diff --git a/src/share/vm/oops/instanceKlass.hpp b/src/share/vm/oops/instanceKlass.hpp
-index bb613b0..71f0083 100644
---- a/src/share/vm/oops/instanceKlass.hpp
-+++ b/src/share/vm/oops/instanceKlass.hpp
-@@ -102,6 +102,22 @@
- virtual void do_field(fieldDescriptor* fd) = 0;
- };
-
-+// (tw) Iterates over the fields of the old and new class
-+class FieldEvolutionClosure : public StackObj {
-+public:
-+ virtual void do_new_field(fieldDescriptor* fd) = 0;
-+ virtual void do_old_field(fieldDescriptor* fd) = 0;
-+ virtual void do_changed_field(fieldDescriptor* old_fd, fieldDescriptor *new_fd) = 0;
-+};
-+
-+// (tw) Iterates over the methods of the old and new class
-+class MethodEvolutionClosure : public StackObj {
-+public:
-+ virtual void do_new_method(methodOop oop) = 0;
-+ virtual void do_old_method(methodOop oop) = 0;
-+ virtual void do_changed_method(methodOop oldOop, methodOop newOop) = 0;
-+};
-+
- #ifndef PRODUCT
- // Print fields.
- // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
-@@ -287,6 +303,11 @@
- // _idnum_allocated_count.
- u1 _init_state; // state of class
-
-+ // (tw) Field that allows for a short-path when calculating updated fields for the second time and
-+ // no fields changed. Testing performance impact with this, can be removed later when the update
-+ // information is cached.
-+ bool _fields_not_changed;
-+
- u1 _reference_type; // reference type
-
- // embedded Java vtable follows here
-@@ -454,6 +475,7 @@
- // initialization (virtuals from Klass)
- bool should_be_initialized() const; // means that initialize should be called
- void initialize(TRAPS);
-+ void initialize_redefined_class();
- void link_class(TRAPS);
- bool link_class_or_fail(TRAPS); // returns false on failure
- void unlink_class();
-@@ -631,6 +653,7 @@
- static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
- size_t *length_p, jmethodID* id_p);
- jmethodID jmethod_id_or_null(methodOop method);
-+ bool update_jmethod_id(methodOop method, jmethodID newMethodID);
-
- // cached itable index support
- void set_cached_itable_index(size_t idnum, int index);
-@@ -713,6 +736,7 @@
-
- // subclass/subinterface checks
- bool implements_interface(klassOop k) const;
-+ bool implements_interface_any_version(klassOop k) const;
-
- // Access to the implementor of an interface.
- klassOop implementor() const
-@@ -762,6 +786,12 @@
- void do_local_static_fields(FieldClosure* cl);
- void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
- void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
-+ void do_fields_evolution(FieldEvolutionClosure *cl);
-+ void store_update_information(GrowableArray<int> &values);
-+ void clear_update_information();
-+ void store_type_check_information(GrowableArray< Pair<int, klassOop> > &values);
-+ void clear_type_check_information();
-+
-
- void methods_do(void f(methodOop method));
- void array_klasses_do(void f(klassOop k));
-diff --git a/src/share/vm/oops/instanceKlassKlass.cpp b/src/share/vm/oops/instanceKlassKlass.cpp
-index 8e7dc12..63d6dc4 100644
---- a/src/share/vm/oops/instanceKlassKlass.cpp
-+++ b/src/share/vm/oops/instanceKlassKlass.cpp
-@@ -480,6 +480,28 @@
- instanceKlass* ik = instanceKlass::cast(klassOop(obj));
- klassKlass::oop_print_on(obj, st);
-
-+ // (tw) Output revision number and revision numbers of older / newer and oldest / newest version of this class.
-+
-+ st->print(BULLET"revision: %d", ik->revision_number());
-+
-+ if (ik->new_version() != NULL) {
-+ st->print(" (newer=%d)", ik->new_version()->klass_part()->revision_number());
-+ }
-+
-+ if (ik->newest_version() != ik->new_version() && ik->newest_version() != obj) {
-+ st->print(" (newest=%d)", ik->newest_version()->klass_part()->revision_number());
-+ }
-+
-+ if (ik->old_version() != NULL) {
-+ st->print(" (old=%d)", ik->old_version()->klass_part()->revision_number());
-+ }
-+
-+ if (ik->oldest_version() != ik->old_version() && ik->oldest_version() != obj) {
-+ st->print(" (oldest=%d)", ik->oldest_version()->klass_part()->revision_number());
-+ }
-+
-+ st->cr();
-+
- st->print(BULLET"instance size: %d", ik->size_helper()); st->cr();
- st->print(BULLET"klass size: %d", ik->object_size()); st->cr();
- st->print(BULLET"access: "); ik->access_flags().print_on(st); st->cr();
-@@ -663,7 +685,7 @@
- }
- guarantee(sib->as_klassOop()->is_klass(), "should be klass");
- guarantee(sib->as_klassOop()->is_perm(), "should be in permspace");
-- guarantee(sib->super() == super, "siblings should have same superklass");
-+ guarantee(sib->super() == super || super->klass_part()->newest_version() == SystemDictionary::Object_klass(), "siblings should have same superklass");
- sib = sib->next_sibling();
- }
-
-diff --git a/src/share/vm/oops/instanceRefKlass.cpp b/src/share/vm/oops/instanceRefKlass.cpp
-index 7db4f03..1171487 100644
---- a/src/share/vm/oops/instanceRefKlass.cpp
-+++ b/src/share/vm/oops/instanceRefKlass.cpp
-@@ -455,10 +455,13 @@
- instanceKlass* ik = instanceKlass::cast(k);
-
- // Check that we have the right class
-- debug_only(static bool first_time = true);
-- assert(k == SystemDictionary::Reference_klass() && first_time,
-- "Invalid update of maps");
-- debug_only(first_time = false);
-+
-+ // (tw) Asserts no longer valid for class redefinition
-+ // debug_only(static bool first_time = true);
-+
-+ //assert(k == SystemDictionary::Reference_klass() && first_time,
-+ // "Invalid update of maps");
-+ //debug_only(first_time = false);
- assert(ik->nonstatic_oop_map_count() == 1, "just checking");
-
- OopMapBlock* map = ik->start_of_nonstatic_oop_maps();
-diff --git a/src/share/vm/oops/klass.cpp b/src/share/vm/oops/klass.cpp
-index ff33181..28537e2 100644
---- a/src/share/vm/oops/klass.cpp
-+++ b/src/share/vm/oops/klass.cpp
-@@ -55,6 +55,26 @@
- return false;
- }
-
-+void Klass::update_supers_to_newest_version() {
-+
-+ if (super() != NULL) set_super(super()->klass_part()->newest_version());
-+
-+ for (uint i=0; i<primary_super_limit(); i++) {
-+ klassOop cur = _primary_supers[i];
-+ if (cur != NULL) {
-+ _primary_supers[i] = cur->klass_part()->newest_version();
-+ }
-+ }
-+
-+ // Scan the array-of-objects
-+ int cnt = secondary_supers()->length();
-+ for (int i = 0; i < cnt; i++) {
-+ klassOop cur = (klassOop)secondary_supers()->obj_at(i);
-+ if (cur != NULL) {
-+ secondary_supers()->obj_at_put(i, cur->klass_part()->newest_version());
-+ }
-+ }
-+}
- bool Klass::search_secondary_supers(klassOop k) const {
- // Put some extra logic here out-of-line, before the search proper.
- // This cuts down the size of the inline method.
-@@ -170,6 +190,16 @@
- kl->set_alloc_size(0);
- TRACE_INIT_ID(kl);
-
-+ kl->set_redefinition_flags(Klass::NoRedefinition);
-+ kl->set_redefining(false);
-+ kl->set_new_version(NULL);
-+ kl->set_old_version(NULL);
-+ kl->set_redefinition_index(-1);
-+ kl->set_revision_number(-1);
-+ kl->set_field_redefinition_policy(DynamicCheck);
-+ kl->set_static_field_redefinition_policy(AccessDeletedMembers);
-+ kl->set_method_redefinition_policy(AccessDeletedMembers);
-+
- kl->set_prototype_header(markOopDesc::prototype());
- kl->set_biased_lock_revocation_count(0);
- kl->set_last_biased_lock_bulk_revocation_time(0);
-@@ -241,7 +271,7 @@
- set_super(NULL);
- oop_store_without_check((oop*) &_primary_supers[0], (oop) this->as_klassOop());
- assert(super_depth() == 0, "Object must already be initialized properly");
-- } else if (k != super() || k == SystemDictionary::Object_klass()) {
-+ } else if (k != super() || k->klass_part()->super() == NULL) {
- assert(super() == NULL || super() == SystemDictionary::Object_klass(),
- "initialize this only once to a non-trivial value");
- set_super(k);
-diff --git a/src/share/vm/oops/klass.hpp b/src/share/vm/oops/klass.hpp
-index a449e87..52364ba 100644
---- a/src/share/vm/oops/klass.hpp
-+++ b/src/share/vm/oops/klass.hpp
-@@ -171,6 +171,7 @@
- void* operator new(size_t ignored, KlassHandle& klass, int size, TRAPS);
- };
-
-+template<class L, class R> class Pair;
-
- class Klass : public Klass_vtbl {
- friend class VMStructs;
-@@ -223,6 +224,39 @@
- oop* oop_block_beg() const { return adr_secondary_super_cache(); }
- oop* oop_block_end() const { return adr_next_sibling() + 1; }
-
-+ // (tw) Different class redefinition flags of code evolution.
-+ enum RedefinitionFlags {
-+
-+ // This class is not redefined at all!
-+ NoRedefinition,
-+
-+ // There are changes to the class meta data.
-+ ModifyClass = 1,
-+
-+ // The size of the class meta data changes.
-+ ModifyClassSize = ModifyClass << 1,
-+
-+ // There are change to the instance format.
-+ ModifyInstances = ModifyClassSize << 1,
-+
-+ // The size of instances changes.
-+ ModifyInstanceSize = ModifyInstances << 1,
-+
-+ // A super type of this class is removed.
-+ RemoveSuperType = ModifyInstanceSize << 1,
-+
-+ // This class (or one of its super classes) has an instance transformer method.
-+ HasInstanceTransformer = RemoveSuperType << 1,
-+ };
-+
-+ // (tw) Different policies dealing with deleted fields / methods in old code.
-+ enum RedefinitionPolicy {
-+ StaticCheck,
-+ DynamicCheck,
-+ AccessDeletedMembers,
-+ AccessOldMembers
-+ };
-+
- protected:
- //
- // The oop block. All oop fields must be declared here and only oop fields
-@@ -242,6 +276,10 @@
- oop _java_mirror;
- // Superclass
- klassOop _super;
-+ // Old class
-+ klassOop _old_version;
-+ // New class
-+ klassOop _new_version;
- // First subclass (NULL if none); _subklass->next_sibling() is next one
- klassOop _subklass;
- // Sibling link (or NULL); links all subklasses of a klass
-@@ -253,6 +291,19 @@
-
- jint _modifier_flags; // Processed access flags, for use by Class.getModifiers.
- AccessFlags _access_flags; // Access flags. The class/interface distinction is stored here.
-+
-+ // (tw) Non-oop fields for enhanced class redefinition
-+ jint _revision_number; // The revision number for redefined classes
-+ jint _redefinition_index; // Index of this class when performing the redefinition
-+ bool _subtype_changed;
-+ int _redefinition_flags; // Level of class redefinition
-+ bool _is_copying_backwards; // Does the class need to copy fields backwards? => possibly overwrite itself?
-+ int * _update_information; // Update information
-+ Pair<int, klassOop> * _type_check_information; // Offsets of object fields that need a type check
-+ char _method_redefinition_policy;
-+ char _field_redefinition_policy;
-+ char _static_field_redefinition_policy;
-+ bool _is_redefining;
-
- #ifndef PRODUCT
- int _verify_count; // to avoid redundant verifies
-@@ -301,6 +352,99 @@
-
- klassOop secondary_super_cache() const { return _secondary_super_cache; }
- void set_secondary_super_cache(klassOop k) { oop_store_without_check((oop*) &_secondary_super_cache, (oop) k); }
-+
-+ // BEGIN class redefinition utilities
-+
-+ // double links between new and old version of a class
-+ klassOop old_version() const { return _old_version; }
-+ void set_old_version(klassOop klass) { assert(_old_version == NULL || klass == NULL, "Can only be set once!"); _old_version = klass; }
-+ klassOop new_version() const { return _new_version; }
-+ void set_new_version(klassOop klass) { assert(_new_version == NULL || klass == NULL, "Can only be set once!"); _new_version = klass; }
-+
-+ // A subtype of this class is no longer a subtype
-+ bool has_subtype_changed() const { return _subtype_changed; }
-+ void set_subtype_changed(bool b) { assert(is_newest_version() || new_version()->klass_part()->is_newest_version(), "must be newest or second newest version");
-+ _subtype_changed = b; }
-+ // state of being redefined
-+ int redefinition_index() const { return _redefinition_index; }
-+ void set_redefinition_index(int index) { _redefinition_index = index; }
-+ void set_redefining(bool b) { _is_redefining = b; }
-+ bool is_redefining() const { return _is_redefining; }
-+ int redefinition_flags() const { return _redefinition_flags; }
-+ bool check_redefinition_flag(int flags) const { return (_redefinition_flags & flags) != 0; }
-+ void set_redefinition_flags(int flags) { _redefinition_flags = flags; }
-+ bool is_copying_backwards() const { return _is_copying_backwards; }
-+ void set_copying_backwards(bool b) { _is_copying_backwards = b; }
-+
-+ // update information
-+ int *update_information() const { return _update_information; }
-+ void set_update_information(int *info) { _update_information = info; }
-+ Pair<int, klassOop> *type_check_information() const { return _type_check_information; }
-+ void set_type_check_information(Pair<int, klassOop> *info) { _type_check_information = info; }
-+
-+ bool is_same_or_older_version(klassOop klass) const {
-+ if (Klass::cast(klass) == this) { return true; }
-+ else if (_old_version == NULL) { return false; }
-+ else { return _old_version->klass_part()->is_same_or_older_version(klass); }
-+ }
-+
-+ // Revision number for redefined classes, -1 for originally loaded classes
-+ jint revision_number() const {
-+ return _revision_number;
-+ }
-+
-+ bool was_redefined() const {
-+ return _revision_number != -1;
-+ }
-+
-+ void set_revision_number(jint number) {
-+ _revision_number = number;
-+ }
-+
-+ char method_redefinition_policy() {
-+ return _method_redefinition_policy;
-+ }
-+
-+ void set_method_redefinition_policy(char v) {
-+ _method_redefinition_policy = v;
-+ }
-+
-+ char field_redefinition_policy() {
-+ return _field_redefinition_policy;
-+ }
-+
-+ void set_field_redefinition_policy(char v) {
-+ _field_redefinition_policy = v;
-+ }
-+
-+ char static_field_redefinition_policy() {
-+ return _static_field_redefinition_policy;
-+ }
-+
-+ void set_static_field_redefinition_policy(char v) {
-+ _static_field_redefinition_policy = v;
-+ }
-+
-+ klassOop oldest_version() const {
-+ if (_old_version == NULL) { return this->as_klassOop(); }
-+ else { return _old_version->klass_part()->oldest_version(); };
-+ }
-+
-+ klassOop newest_version() const {
-+ if (_new_version == NULL) { return this->as_klassOop(); }
-+ else { return _new_version->klass_part()->newest_version(); };
-+ }
-+
-+ klassOop active_version() const {
-+ if (_new_version == NULL || _new_version->klass_part()->is_redefining()) { return this->as_klassOop(); assert(!this->is_redefining(), "just checking"); }
-+ else { return _new_version->klass_part()->active_version(); };
-+ }
-+
-+ bool is_newest_version() const {
-+ return _new_version == NULL;
-+ }
-+
-+ // END class redefinition utilities
-
- objArrayOop secondary_supers() const { return _secondary_supers; }
- void set_secondary_supers(objArrayOop k) { oop_store_without_check((oop*) &_secondary_supers, (oop) k); }
-@@ -362,6 +506,8 @@
- void set_next_sibling(klassOop s);
-
- oop* adr_super() const { return (oop*)&_super; }
-+ oop* adr_old_version() const { return (oop*)&_old_version; }
-+ oop* adr_new_version() const { return (oop*)&_new_version; }
- oop* adr_primary_supers() const { return (oop*)&_primary_supers[0]; }
- oop* adr_secondary_super_cache() const { return (oop*)&_secondary_super_cache; }
- oop* adr_secondary_supers()const { return (oop*)&_secondary_supers; }
-@@ -491,6 +637,7 @@
- return search_secondary_supers(k);
- }
- }
-+ void update_supers_to_newest_version();
- bool search_secondary_supers(klassOop k) const;
-
- // Find LCA in class hierarchy
-@@ -818,6 +965,8 @@
-
-
- inline oop klassOopDesc::java_mirror() const { return klass_part()->java_mirror(); }
-+inline klassOop klassOopDesc::old_version() const { return klass_part()->old_version(); }
-+inline klassOop klassOopDesc::new_version() const { return klass_part()->new_version(); }
-
-
- #endif // SHARE_VM_OOPS_KLASS_HPP
-diff --git a/src/share/vm/oops/klassKlass.cpp b/src/share/vm/oops/klassKlass.cpp
-index 06809d5..9c08f32 100644
---- a/src/share/vm/oops/klassKlass.cpp
-+++ b/src/share/vm/oops/klassKlass.cpp
-@@ -68,6 +68,8 @@
- Klass* k = Klass::cast(klassOop(obj));
- // If we are alive it is valid to keep our superclass and subtype caches alive
- MarkSweep::mark_and_push(k->adr_super());
-+ MarkSweep::mark_and_push(k->adr_old_version());
-+ MarkSweep::mark_and_push(k->adr_new_version());
- for (juint i = 0; i < Klass::primary_super_limit(); i++)
- MarkSweep::mark_and_push(k->adr_primary_supers()+i);
- MarkSweep::mark_and_push(k->adr_secondary_super_cache());
-@@ -87,6 +89,8 @@
- Klass* k = Klass::cast(klassOop(obj));
- // If we are alive it is valid to keep our superclass and subtype caches alive
- PSParallelCompact::mark_and_push(cm, k->adr_super());
-+ PSParallelCompact::mark_and_push(cm, k->adr_old_version());
-+ PSParallelCompact::mark_and_push(cm, k->adr_new_version());
- for (juint i = 0; i < Klass::primary_super_limit(); i++)
- PSParallelCompact::mark_and_push(cm, k->adr_primary_supers()+i);
- PSParallelCompact::mark_and_push(cm, k->adr_secondary_super_cache());
-@@ -106,6 +110,8 @@
- int size = oop_size(obj);
- Klass* k = Klass::cast(klassOop(obj));
- blk->do_oop(k->adr_super());
-+ blk->do_oop(k->adr_old_version());
-+ blk->do_oop(k->adr_new_version());
- for (juint i = 0; i < Klass::primary_super_limit(); i++)
- blk->do_oop(k->adr_primary_supers()+i);
- blk->do_oop(k->adr_secondary_super_cache());
-@@ -134,6 +140,10 @@
- oop* adr;
- adr = k->adr_super();
- if (mr.contains(adr)) blk->do_oop(adr);
-+ adr = k->adr_old_version();
-+ if (mr.contains(adr)) blk->do_oop(adr);
-+ adr = k->adr_new_version();
-+ if (mr.contains(adr)) blk->do_oop(adr);
- for (juint i = 0; i < Klass::primary_super_limit(); i++) {
- adr = k->adr_primary_supers()+i;
- if (mr.contains(adr)) blk->do_oop(adr);
-@@ -147,6 +157,8 @@
- // The following are "weak links" in the perm gen and are
- // treated specially in a later phase of a perm gen collection.
- assert(oop(k)->is_perm(), "should be in perm");
-+ assert(oop(k->adr_old_version())->is_perm(), "should be in perm");
-+ assert(oop(k->adr_new_version())->is_perm(), "should be in perm");
- assert(oop(k->adr_subklass())->is_perm(), "should be in perm");
- assert(oop(k->adr_next_sibling())->is_perm(), "should be in perm");
- if (blk->should_remember_klasses()
-@@ -167,6 +179,8 @@
- Klass* k = Klass::cast(klassOop(obj));
-
- MarkSweep::adjust_pointer(k->adr_super());
-+ MarkSweep::adjust_pointer(k->adr_new_version());
-+ MarkSweep::adjust_pointer(k->adr_old_version());
- for (juint i = 0; i < Klass::primary_super_limit(); i++)
- MarkSweep::adjust_pointer(k->adr_primary_supers()+i);
- MarkSweep::adjust_pointer(k->adr_secondary_super_cache());
-diff --git a/src/share/vm/oops/klassOop.hpp b/src/share/vm/oops/klassOop.hpp
-index f212fc5..9731a9c 100644
---- a/src/share/vm/oops/klassOop.hpp
-+++ b/src/share/vm/oops/klassOop.hpp
-@@ -41,8 +41,10 @@
- // returns the Klass part containing dispatching behavior
- Klass* klass_part() const { return (Klass*)((address)this + sizeof(klassOopDesc)); }
-
-- // Convenience wrapper
-+ // Convenience wrappers
- inline oop java_mirror() const;
-+ inline klassOop old_version() const;
-+ inline klassOop new_version() const;
-
- private:
- // These have no implementation since klassOop should never be accessed in this fashion
-diff --git a/src/share/vm/oops/klassVtable.cpp b/src/share/vm/oops/klassVtable.cpp
-index ff22444..8d39611 100644
---- a/src/share/vm/oops/klassVtable.cpp
-+++ b/src/share/vm/oops/klassVtable.cpp
-@@ -97,7 +97,8 @@
- vtable_length = Universe::base_vtable_size();
- }
-
-- if (super == NULL && !Universe::is_bootstrapping() &&
-+ // (tw) TODO: Check if we can relax the condition on a fixed base vtable size
-+ /*if (super == NULL && !Universe::is_bootstrapping() &&
- vtable_length != Universe::base_vtable_size()) {
- // Someone is attempting to redefine java.lang.Object incorrectly. The
- // only way this should happen is from
-@@ -107,9 +108,9 @@
- vtable_length = Universe::base_vtable_size();
- }
- assert(super != NULL || vtable_length == Universe::base_vtable_size(),
-- "bad vtable size for class Object");
-+ "bad vtable size for class Object");*/
- assert(vtable_length % vtableEntry::size() == 0, "bad vtable length");
-- assert(vtable_length >= Universe::base_vtable_size(), "vtable too small");
-+ //assert(vtable_length >= Universe::base_vtable_size(), "vtable too small");
- }
-
- int klassVtable::index_of(methodOop m, int len) const {
-@@ -676,20 +677,6 @@
- }
- }
- return true;
--}
--
--void klassVtable::dump_vtable() {
-- tty->print_cr("vtable dump --");
-- for (int i = 0; i < length(); i++) {
-- methodOop m = unchecked_method_at(i);
-- if (m != NULL) {
-- tty->print(" (%5d) ", i);
-- m->access_flags().print_on(tty);
-- tty->print(" -- ");
-- m->print_name(tty);
-- tty->cr();
-- }
-- }
- }
-
- // CDS/RedefineClasses support - clear vtables so they can be reinitialized
-@@ -1262,6 +1249,7 @@
-
- void klassVtable::verify_against(outputStream* st, klassVtable* vt, int index) {
- vtableEntry* vte = &vt->table()[index];
-+ if (vte->method() == NULL || table()[index].method() == NULL) return;
- if (vte->method()->name() != table()[index].method()->name() ||
- vte->method()->signature() != table()[index].method()->signature()) {
- fatal("mismatched name/signature of vtable entries");
-@@ -1281,6 +1269,8 @@
-
- void vtableEntry::verify(klassVtable* vt, outputStream* st) {
- NOT_PRODUCT(FlagSetting fs(IgnoreLockingAssertions, true));
-+ // (tw) TODO: Check: Does not hold?
-+ if (method() != NULL) {
- assert(method() != NULL, "must have set method");
- method()->verify();
- // we sub_type, because it could be a miranda method
-@@ -1288,7 +1278,13 @@
- #ifndef PRODUCT
- print();
- #endif
-- fatal(err_msg("vtableEntry " PTR_FORMAT ": method is from subclass", this));
-+ klassOop first_klass = vt->klass()();
-+ klassOop second_klass = method()->method_holder();
-+ // (tw) the following fatal does not work for old versions of classes
-+ if (first_klass->klass_part()->is_newest_version()) {
-+ //fatal1("vtableEntry %#lx: method is from subclass", this);
-+ }
-+ }
- }
- }
-
-@@ -1296,7 +1292,7 @@
-
- void vtableEntry::print() {
- ResourceMark rm;
-- tty->print("vtableEntry %s: ", method()->name()->as_C_string());
-+ tty->print("vtableEntry %s: ", (method() == NULL) ? "null" : method()->name()->as_C_string());
- if (Verbose) {
- tty->print("m %#lx ", (address)method());
- }
-@@ -1363,6 +1359,33 @@
- tty->print_cr("%6d bytes total", total);
- }
-
-+bool klassVtable::check_no_old_entries() {
-+ // Check that there really is no entry
-+ for (int i = 0; i < length(); i++) {
-+ methodOop m = unchecked_method_at(i);
-+ if (m != NULL) {
-+ if (m->is_old() || !m->method_holder()->klass_part()->is_newest_version()) {
-+ return false;
-+ }
-+ }
-+ }
-+ return true;
-+}
-+
-+void klassVtable::dump_vtable() {
-+ tty->print_cr("vtable dump --");
-+ for (int i = 0; i < length(); i++) {
-+ methodOop m = unchecked_method_at(i);
-+ if (m != NULL) {
-+ tty->print(" (%5d) ", i);
-+ m->access_flags().print_on(tty);
-+ tty->print(" -- ");
-+ m->print_name(tty);
-+ tty->cr();
-+ }
-+ }
-+}
-+
- int klassItable::_total_classes; // Total no. of classes with itables
- long klassItable::_total_size; // Total no. of bytes used for itables
-
-diff --git a/src/share/vm/oops/klassVtable.hpp b/src/share/vm/oops/klassVtable.hpp
-index 405b0c7..0c8d2f7 100644
---- a/src/share/vm/oops/klassVtable.hpp
-+++ b/src/share/vm/oops/klassVtable.hpp
-@@ -100,6 +100,7 @@
- int methods_length, bool * trace_name_printed);
- bool check_no_old_or_obsolete_entries();
- void dump_vtable();
-+ bool check_no_old_entries();
-
- // Garbage collection
- void oop_follow_contents();
-diff --git a/src/share/vm/oops/methodKlass.cpp b/src/share/vm/oops/methodKlass.cpp
-index 75d0b09..f1b7d2f 100644
---- a/src/share/vm/oops/methodKlass.cpp
-+++ b/src/share/vm/oops/methodKlass.cpp
-@@ -93,6 +93,10 @@
- m->set_adapter_entry(NULL);
- m->clear_code(); // from_c/from_i get set to c2i/i2i
-
-+ m->set_forward_method(NULL);
-+ m->set_new_version(NULL);
-+ m->set_old_version(NULL);
-+
- if (access_flags.is_native()) {
- m->clear_native_function();
- m->set_signature_handler(NULL);
-@@ -122,6 +126,9 @@
- // Performance tweak: We skip iterating over the klass pointer since we
- // know that Universe::methodKlassObj never moves.
- MarkSweep::mark_and_push(m->adr_constMethod());
-+ MarkSweep::mark_and_push(m->adr_forward_method());
-+ MarkSweep::mark_and_push(m->adr_new_version());
-+ MarkSweep::mark_and_push(m->adr_old_version());
- if (m->method_data() != NULL) {
- MarkSweep::mark_and_push(m->adr_method_data());
- }
-@@ -135,6 +142,9 @@
- // Performance tweak: We skip iterating over the klass pointer since we
- // know that Universe::methodKlassObj never moves.
- PSParallelCompact::mark_and_push(cm, m->adr_constMethod());
-+ PSParallelCompact::mark_and_push(cm, m->adr_forward_method());
-+ PSParallelCompact::mark_and_push(cm, m->adr_new_version());
-+ PSParallelCompact::mark_and_push(cm, m->adr_old_version());
- #ifdef COMPILER2
- if (m->method_data() != NULL) {
- PSParallelCompact::mark_and_push(cm, m->adr_method_data());
-@@ -152,6 +162,9 @@
- // Performance tweak: We skip iterating over the klass pointer since we
- // know that Universe::methodKlassObj never moves
- blk->do_oop(m->adr_constMethod());
-+ blk->do_oop(m->adr_forward_method());
-+ blk->do_oop(m->adr_new_version());
-+ blk->do_oop(m->adr_old_version());
- if (m->method_data() != NULL) {
- blk->do_oop(m->adr_method_data());
- }
-@@ -170,6 +183,12 @@
- oop* adr;
- adr = m->adr_constMethod();
- if (mr.contains(adr)) blk->do_oop(adr);
-+ adr = m->adr_new_version();
-+ if (mr.contains(adr)) blk->do_oop(adr);
-+ adr = m->adr_forward_method();
-+ if (mr.contains(adr)) blk->do_oop(adr);
-+ adr = m->adr_old_version();
-+ if (mr.contains(adr)) blk->do_oop(adr);
- if (m->method_data() != NULL) {
- adr = m->adr_method_data();
- if (mr.contains(adr)) blk->do_oop(adr);
-@@ -187,6 +206,9 @@
- // Performance tweak: We skip iterating over the klass pointer since we
- // know that Universe::methodKlassObj never moves.
- MarkSweep::adjust_pointer(m->adr_constMethod());
-+ MarkSweep::adjust_pointer(m->adr_forward_method());
-+ MarkSweep::adjust_pointer(m->adr_new_version());
-+ MarkSweep::adjust_pointer(m->adr_old_version());
- if (m->method_data() != NULL) {
- MarkSweep::adjust_pointer(m->adr_method_data());
- }
-@@ -202,6 +224,9 @@
- assert(obj->is_method(), "should be method");
- methodOop m = methodOop(obj);
- PSParallelCompact::adjust_pointer(m->adr_constMethod());
-+ PSParallelCompact::adjust_pointer(m->adr_forward_method());
-+ PSParallelCompact::adjust_pointer(m->adr_new_version());
-+ PSParallelCompact::adjust_pointer(m->adr_old_version());
- #ifdef COMPILER2
- if (m->method_data() != NULL) {
- PSParallelCompact::adjust_pointer(m->adr_method_data());
-@@ -222,7 +247,18 @@
- methodOop m = methodOop(obj);
- // get the effect of PrintOopAddress, always, for methods:
- st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)m);
-- st->print (" - method holder: "); m->method_holder()->print_value_on(st); st->cr();
-+ st->print (" - method holder: "); m->method_holder()->print_value_on(st);
-+
-+ if (m->method_holder()->klass_part()->new_version() != NULL) {
-+ st->print(" (old)");
-+ }
-+ st->cr();
-+
-+ st->print_cr(" - is obsolete: %d", (int)(m->is_obsolete()));
-+ st->print_cr(" - is old: %d", (int)(m->is_old()));
-+ st->print_cr(" - new version: "INTPTR_FORMAT" ", (address)(m->new_version()));
-+ st->print_cr(" - old version: "INTPTR_FORMAT" ", (address)(m->old_version()));
-+ st->print_cr(" - holder revision: %d", m->method_holder()->klass_part()->revision_number());
- st->print (" - constants: "INTPTR_FORMAT" ", (address)m->constants());
- m->constants()->print_value_on(st); st->cr();
- st->print (" - access: 0x%x ", m->access_flags().as_int()); m->access_flags().print_on(st); st->cr();
-diff --git a/src/share/vm/oops/methodOop.cpp b/src/share/vm/oops/methodOop.cpp
-index 4f59d3a..5cdf147 100644
---- a/src/share/vm/oops/methodOop.cpp
-+++ b/src/share/vm/oops/methodOop.cpp
-@@ -328,6 +328,70 @@
- }
-
-
-+bool methodOopDesc::is_in_code_section(int bci) {
-+ // There is no table => every bci is in the code section table.
-+ if (!constMethod()->has_code_section_table()) return true;
-+
-+ constMethodOop m = constMethod();
-+ for (int i = 0; i < m->code_section_entries(); ++i) {
-+ u2 new_index = m->code_section_new_index_at(i);
-+ u2 length = m->code_section_length_at(i);
-+ if (bci >= new_index && bci < new_index + length) {
-+ // We are in a specified code section.
-+ return true;
-+ }
-+ }
-+
-+ return false;
-+}
-+
-+int methodOopDesc::calculate_forward_bci(int bci, methodOop new_method) {
-+ int original_bci = -1;
-+ if (constMethod()->has_code_section_table()) {
-+ assert(is_in_code_section(bci), "can only forward in section");
-+ // First calculate back to original bci.
-+ constMethodOop m = constMethod();
-+ for (int i = 0; i < m->code_section_entries(); ++i) {
-+ u2 new_index = m->code_section_new_index_at(i);
-+ u2 original_index = m->code_section_original_index_at(i);
-+ u2 length = m->code_section_length_at(i);
-+ if (bci >= new_index && bci < new_index + length) {
-+ // We are in a specified code section.
-+ original_bci = bci - new_index + original_index;
-+ break;
-+ }
-+ }
-+ assert (original_bci != -1, "must have been in code section");
-+ } else {
-+ // No code sections specified => we are in an original method.
-+ original_bci = bci;
-+ }
-+
-+ // We know the original bci => match to new method.
-+ int new_bci = -1;
-+ if (new_method->constMethod()->has_code_section_table()) {
-+ // Map to new bci.
-+ constMethodOop m = new_method->constMethod();
-+ for (int i = 0; i < m->code_section_entries(); ++i) {
-+ u2 new_index = m->code_section_new_index_at(i);
-+ u2 original_index = m->code_section_original_index_at(i);
-+ u2 length = m->code_section_length_at(i);
-+ if (original_bci >= original_index && original_bci < original_index + length) {
-+ new_bci = original_bci - original_index + new_index;
-+ break;
-+ }
-+ }
-+ assert (new_bci != -1, "must have found new code section");
-+
-+ } else {
-+ // We are in an original method.
-+ new_bci = original_bci;
-+ }
-+
-+ return new_bci;
-+}
-+
-+
- int methodOopDesc::extra_stack_words() {
- // not an inline function, to avoid a header dependency on Interpreter
- return extra_stack_entries() * Interpreter::stackElementSize;
-@@ -1061,6 +1125,9 @@
-
- // Reset correct method/const method, method size, and parameter info
- newm->set_constMethod(newcm);
-+ newm->set_forward_method(newm->forward_method());
-+ newm->set_new_version(newm->new_version());
-+ newm->set_old_version(newm->old_version());
- newm->constMethod()->set_code_size(new_code_length);
- newm->constMethod()->set_constMethod_size(new_const_method_size);
- newm->set_method_size(new_method_size);
-diff --git a/src/share/vm/oops/methodOop.hpp b/src/share/vm/oops/methodOop.hpp
-index 486e106..11e52bb 100644
---- a/src/share/vm/oops/methodOop.hpp
-+++ b/src/share/vm/oops/methodOop.hpp
-@@ -114,6 +114,11 @@
- AccessFlags _access_flags; // Access flags
- int _vtable_index; // vtable index of this method (see VtableIndexFlag)
- // note: can have vtables with >2**16 elements (because of inheritance)
-+ // (tw) Newer version of method available?
-+ methodOop _forward_method;
-+ methodOop _new_version;
-+ methodOop _old_version;
-+
- #ifdef CC_INTERP
- int _result_index; // C++ interpreter needs for converting results to/from stack
- #endif
-@@ -174,6 +179,32 @@
- Symbol* name() const { return constants()->symbol_at(name_index()); }
- int name_index() const { return constMethod()->name_index(); }
- void set_name_index(int index) { constMethod()->set_name_index(index); }
-+
-+ methodOop forward_method() const {return _forward_method; }
-+ void set_forward_method(methodOop m) { _forward_method = m; }
-+ bool has_forward_method() const { return forward_method() != NULL; }
-+ methodOop new_version() const {return _new_version; }
-+ void set_new_version(methodOop m) { _new_version = m; }
-+ methodOop newest_version() { if(_new_version == NULL) return this; else return new_version()->newest_version(); }
-+
-+ methodOop old_version() const {return _old_version; };
-+ void set_old_version(methodOop m) {
-+ if (m == NULL) {
-+ _old_version = NULL;
-+ return;
-+ }
-+
-+ assert(_old_version == NULL, "may only be set once");
-+ assert(this->code_size() == m->code_size(), "must have same code length");
-+ _old_version = m;
-+ }
-+
-+ methodOop oldest_version() const {
-+ if(_old_version == NULL) return (methodOop)this;
-+ else {
-+ return old_version()->oldest_version();
-+ }
-+ }
-
- // signature
- Symbol* signature() const { return constants()->symbol_at(signature_index()); }
-@@ -670,6 +701,10 @@
- // Inline cache support
- void cleanup_inline_caches();
-
-+ // (tw) Method forwarding support.
-+ bool is_in_code_section(int bci);
-+ int calculate_forward_bci(int bci, methodOop new_method);
-+
- // Find if klass for method is loaded
- bool is_klass_loaded_by_klass_index(int klass_index) const;
- bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
-@@ -734,6 +769,9 @@
-
- // Garbage collection support
- oop* adr_constMethod() const { return (oop*)&_constMethod; }
-+ oop* adr_forward_method() const { return (oop*)&_forward_method; }
-+ oop* adr_new_version() const { return (oop*)&_new_version; }
-+ oop* adr_old_version() const { return (oop*)&_old_version; }
- oop* adr_method_data() const { return (oop*)&_method_data; }
- };
-
-diff --git a/src/share/vm/oops/oop.hpp b/src/share/vm/oops/oop.hpp
-index 5982c88..4873fca 100644
---- a/src/share/vm/oops/oop.hpp
-+++ b/src/share/vm/oops/oop.hpp
-@@ -95,6 +95,7 @@
- narrowOop* compressed_klass_addr();
-
- void set_klass(klassOop k);
-+ void set_klass_no_check(klassOop k);
-
- // For klass field compression
- int klass_gap() const;
-@@ -135,6 +136,7 @@
- bool is_array() const;
- bool is_objArray() const;
- bool is_klass() const;
-+ bool is_instanceKlass() const;
- bool is_thread() const;
- bool is_method() const;
- bool is_constMethod() const;
-diff --git a/src/share/vm/oops/oop.inline.hpp b/src/share/vm/oops/oop.inline.hpp
-index f4eb2f7..0acb346 100644
---- a/src/share/vm/oops/oop.inline.hpp
-+++ b/src/share/vm/oops/oop.inline.hpp
-@@ -123,6 +123,14 @@
- }
- }
-
-+inline void oopDesc::set_klass_no_check(klassOop k) {
-+ if (UseCompressedOops) {
-+ oop_store_without_check(compressed_klass_addr(), (oop)k);
-+ } else {
-+ oop_store_without_check(klass_addr(), (oop) k);
-+ }
-+}
-+
- inline int oopDesc::klass_gap() const {
- return *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes());
- }
-@@ -156,6 +164,7 @@
- inline bool oopDesc::is_typeArray() const { return blueprint()->oop_is_typeArray(); }
- inline bool oopDesc::is_javaArray() const { return blueprint()->oop_is_javaArray(); }
- inline bool oopDesc::is_klass() const { return blueprint()->oop_is_klass(); }
-+inline bool oopDesc::is_instanceKlass() const { return blueprint()->oop_is_instanceKlass(); }
- inline bool oopDesc::is_thread() const { return blueprint()->oop_is_thread(); }
- inline bool oopDesc::is_method() const { return blueprint()->oop_is_method(); }
- inline bool oopDesc::is_constMethod() const { return blueprint()->oop_is_constMethod(); }
-diff --git a/src/share/vm/prims/jni.cpp b/src/share/vm/prims/jni.cpp
-index 50e1263..701ed74 100644
---- a/src/share/vm/prims/jni.cpp
-+++ b/src/share/vm/prims/jni.cpp
-@@ -406,7 +406,7 @@
- }
- }
- klassOop k = SystemDictionary::resolve_from_stream(class_name, class_loader,
-- Handle(), &st, true,
-+ Handle(), &st, true, KlassHandle(),
- CHECK_NULL);
-
- if (TraceClassResolution && k != NULL) {
-diff --git a/src/share/vm/prims/jvm.cpp b/src/share/vm/prims/jvm.cpp
-index ccd09f6..ef3f024 100644
---- a/src/share/vm/prims/jvm.cpp
-+++ b/src/share/vm/prims/jvm.cpp
-@@ -932,7 +932,7 @@
- Handle protection_domain (THREAD, JNIHandles::resolve(pd));
- klassOop k = SystemDictionary::resolve_from_stream(class_name, class_loader,
- protection_domain, &st,
-- verify != 0,
-+ verify != 0, KlassHandle(),
- CHECK_NULL);
-
- if (TraceClassResolution && k != NULL) {
-diff --git a/src/share/vm/prims/jvmtiEnv.cpp b/src/share/vm/prims/jvmtiEnv.cpp
-index 4ac6b82..30b8e84 100644
---- a/src/share/vm/prims/jvmtiEnv.cpp
-+++ b/src/share/vm/prims/jvmtiEnv.cpp
-@@ -290,7 +290,10 @@
- class_definitions[index].klass = jcls;
- }
- VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
-- VMThread::execute(&op);
-+ {
-+ MutexLocker sd_mutex(RedefineClasses_lock);
-+ VMThread::execute(&op);
-+ }
- return (op.check_error());
- } /* end RetransformClasses */
-
-@@ -299,9 +302,12 @@
- // class_definitions - pre-checked for NULL
- jvmtiError
- JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) {
--//TODO: add locking
-+
- VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
-- VMThread::execute(&op);
-+ {
-+ MutexLocker sd_mutex(RedefineClasses_lock);
-+ VMThread::execute(&op);
-+ }
- return (op.check_error());
- } /* end RedefineClasses */
-
-diff --git a/src/share/vm/prims/jvmtiExport.cpp b/src/share/vm/prims/jvmtiExport.cpp
-index ec8ede3..2bd5983 100644
---- a/src/share/vm/prims/jvmtiExport.cpp
-+++ b/src/share/vm/prims/jvmtiExport.cpp
-@@ -2296,7 +2296,7 @@
- // iterate over any code blob descriptors collected and post a
- // DYNAMIC_CODE_GENERATED event to the profiler.
- JvmtiDynamicCodeEventCollector::~JvmtiDynamicCodeEventCollector() {
-- assert(!JavaThread::current()->owns_locks(), "all locks must be released to post deferred events");
-+ assert(!JavaThread::current()->owns_locks_but_redefine_classes_lock(), "all locks must be released to post deferred events");
- // iterate over any code blob descriptors that we collected
- if (_code_blobs != NULL) {
- for (int i=0; i<_code_blobs->length(); i++) {
-diff --git a/src/share/vm/prims/jvmtiImpl.cpp b/src/share/vm/prims/jvmtiImpl.cpp
-index d3fa140..f4f8b57 100644
---- a/src/share/vm/prims/jvmtiImpl.cpp
-+++ b/src/share/vm/prims/jvmtiImpl.cpp
-@@ -286,6 +286,8 @@
- void JvmtiBreakpoint::each_method_version_do(method_action meth_act) {
- ((methodOopDesc*)_method->*meth_act)(_bci);
-
-+ // DCEVM: TODO: Check how we can implement this differently here!
-+
- // add/remove breakpoint to/from versions of the method that
- // are EMCP. Directly or transitively obsolete methods are
- // not saved in the PreviousVersionInfo.
-diff --git a/src/share/vm/prims/jvmtiRedefineClasses.cpp b/src/share/vm/prims/jvmtiRedefineClasses.cpp
-index 606be1c..ef4f380 100644
---- a/src/share/vm/prims/jvmtiRedefineClasses.cpp
-+++ b/src/share/vm/prims/jvmtiRedefineClasses.cpp
-@@ -1,5 +1,5 @@
- /*
-- * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
-+ * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
-@@ -30,581 +30,637 @@
- #include "interpreter/rewriter.hpp"
- #include "memory/gcLocker.hpp"
- #include "memory/universe.inline.hpp"
--#include "oops/fieldStreams.hpp"
-+#include "memory/cardTableRS.hpp"
- #include "oops/klassVtable.hpp"
-+#include "oops/fieldStreams.hpp"
- #include "prims/jvmtiImpl.hpp"
- #include "prims/jvmtiRedefineClasses.hpp"
-+#include "prims/jvmtiClassFileReconstituter.hpp"
- #include "prims/methodComparator.hpp"
--#include "prims/methodHandles.hpp"
- #include "runtime/deoptimization.hpp"
- #include "runtime/relocator.hpp"
- #include "utilities/bitMap.inline.hpp"
-+#include "compiler/compileBroker.hpp"
-
-
- objArrayOop VM_RedefineClasses::_old_methods = NULL;
- objArrayOop VM_RedefineClasses::_new_methods = NULL;
--methodOop* VM_RedefineClasses::_matching_old_methods = NULL;
--methodOop* VM_RedefineClasses::_matching_new_methods = NULL;
--methodOop* VM_RedefineClasses::_deleted_methods = NULL;
--methodOop* VM_RedefineClasses::_added_methods = NULL;
-+int* VM_RedefineClasses::_matching_old_methods = NULL;
-+int* VM_RedefineClasses::_matching_new_methods = NULL;
-+int* VM_RedefineClasses::_deleted_methods = NULL;
-+int* VM_RedefineClasses::_added_methods = NULL;
- int VM_RedefineClasses::_matching_methods_length = 0;
- int VM_RedefineClasses::_deleted_methods_length = 0;
- int VM_RedefineClasses::_added_methods_length = 0;
- klassOop VM_RedefineClasses::_the_class_oop = NULL;
-
-+// Holds the revision number of the current class redefinition
-+int VM_RedefineClasses::_revision_number = -1;
-
--VM_RedefineClasses::VM_RedefineClasses(jint class_count,
-- const jvmtiClassDefinition *class_defs,
-- JvmtiClassLoadKind class_load_kind) {
-+VM_RedefineClasses::VM_RedefineClasses(jint class_count, const jvmtiClassDefinition *class_defs, JvmtiClassLoadKind class_load_kind)
-+ : VM_GC_Operation(Universe::heap()->total_full_collections(), GCCause::_jvmti_force_gc) {
-+ RC_TIMER_START(_timer_total);
- _class_count = class_count;
- _class_defs = class_defs;
- _class_load_kind = class_load_kind;
-- _res = JVMTI_ERROR_NONE;
-+ _updated_oops = NULL;
-+ _result = JVMTI_ERROR_NONE;
- }
-
--bool VM_RedefineClasses::doit_prologue() {
-- if (_class_count == 0) {
-- _res = JVMTI_ERROR_NONE;
-- return false;
-+VM_RedefineClasses::~VM_RedefineClasses() {
-+ {
-+ MonitorLockerEx ml(RedefinitionSync_lock);
-+ Threads::set_wait_at_instrumentation_entry(false);
-+ ml.notify_all();
- }
-- if (_class_defs == NULL) {
-- _res = JVMTI_ERROR_NULL_POINTER;
-- return false;
-+
-+ unlock_threads();
-+ RC_TIMER_STOP(_timer_total);
-+
-+ if (TimeRedefineClasses) {
-+ tty->print_cr("Timing Prologue: %d", _timer_prologue.milliseconds());
-+ tty->print_cr("Timing Class Loading: %d", _timer_class_loading.milliseconds());
-+ tty->print_cr("Timing Waiting for Lock: %d", _timer_wait_for_locks.milliseconds());
-+ tty->print_cr("Timing Class Linking: %d", _timer_class_linking.milliseconds());
-+ tty->print_cr("Timing Check Type: %d", _timer_check_type.milliseconds());
-+ tty->print_cr("Timing Prepare Redefinition: %d", _timer_prepare_redefinition.milliseconds());
-+ tty->print_cr("Timing Redefinition GC: %d", _timer_redefinition.milliseconds());
-+ tty->print_cr("Timing Epilogue: %d", _timer_vm_op_epilogue.milliseconds());
-+ tty->print_cr("------------------------------------------------------------------");
-+ tty->print_cr("Total Time: %d", _timer_total.milliseconds());
- }
-- for (int i = 0; i < _class_count; i++) {
-- if (_class_defs[i].klass == NULL) {
-- _res = JVMTI_ERROR_INVALID_CLASS;
-- return false;
-- }
-- if (_class_defs[i].class_byte_count == 0) {
-- _res = JVMTI_ERROR_INVALID_CLASS_FORMAT;
-- return false;
-- }
-- if (_class_defs[i].class_bytes == NULL) {
-- _res = JVMTI_ERROR_NULL_POINTER;
-- return false;
-+}
-+
-+// Searches for all affected classes and performs a sorting such that a supertype is always before a subtype.
-+jvmtiError VM_RedefineClasses::find_sorted_affected_classes(GrowableArray<instanceKlassHandle> *all_affected_klasses) {
-+
-+ // Create array with all classes for which the redefine command was given
-+ GrowableArray<instanceKlassHandle> klasses_to_redefine;
-+ for (int i=0; i<_class_count; i++) {
-+ oop mirror = JNIHandles::resolve_non_null(_class_defs[i].klass);
-+ instanceKlassHandle klass_handle(Thread::current(), java_lang_Class::as_klassOop(mirror));
-+ klasses_to_redefine.append(klass_handle);
-+ assert(klass_handle->new_version() == NULL, "Must be new class");
-+ }
-+
-+ // Find classes not directly redefined, but affected by a redefinition (because one of its supertypes is redefined)
-+ GrowableArray<instanceKlassHandle> affected_classes;
-+ FindAffectedKlassesClosure closure(&klasses_to_redefine, &affected_classes);
-+
-+ // Trace affected classes
-+ if (RC_TRACE_ENABLED(0x00000001)) {
-+ RC_TRACE(0x00000001, ("Klasses affected: %d",
-+ affected_classes.length()));
-+ for (int i=0; i<affected_classes.length(); i++) {
-+ RC_TRACE(0x00000001, ("%s",
-+ affected_classes.at(i)->name()->as_C_string()));
- }
- }
-
-- // Start timer after all the sanity checks; not quite accurate, but
-- // better than adding a bunch of stop() calls.
-- RC_TIMER_START(_timer_vm_op_prologue);
-+ // Add the array of affected classes and the array of redefined classes to get a list of all classes that need a redefinition
-+ all_affected_klasses->appendAll(&klasses_to_redefine);
-+ all_affected_klasses->appendAll(&affected_classes);
-+
-+ // Sort the affected klasses such that a supertype is always on a smaller array index than its subtype.
-+ jvmtiError result = do_topological_class_sorting(_class_defs, _class_count, &affected_classes, all_affected_klasses, Thread::current());
-+ if (RC_TRACE_ENABLED(0x00000001)) {
-+ RC_TRACE(0x00000001, ("Redefine order: "));
-+ for (int i=0; i<all_affected_klasses->length(); i++) {
-+ RC_TRACE(0x00000001, ("%s",
-+ all_affected_klasses->at(i)->name()->as_C_string()));
-+ }
-+ }
-+
-+ return result;
-+}
-+
-+// Searches for the class bytes of the given class and returns them as a byte array.
-+jvmtiError VM_RedefineClasses::find_class_bytes(instanceKlassHandle the_class, const unsigned char **class_bytes, jint *class_byte_count, jboolean *not_changed) {
-+
-+ *not_changed = false;
-+
-+ // Search for the index in the redefinition array that corresponds to the current class
-+ int j;
-+ for (j=0; j<_class_count; j++) {
-+ oop mirror = JNIHandles::resolve_non_null(_class_defs[j].klass);
-+ klassOop the_class_oop = java_lang_Class::as_klassOop(mirror);
-+ if (the_class_oop == the_class()) {
-+ break;
-+ }
-+ }
-+
-+ if (j == _class_count) {
-+
-+ *not_changed = true;
-+
-+ // Redefine with same bytecodes. This is a class that is only indirectly affected by redefinition,
-+ // so the user did not specify a different bytecode for that class.
-+
-+ if (the_class->get_cached_class_file_bytes() == NULL) {
-+ // not cached, we need to reconstitute the class file from VM representation
-+ constantPoolHandle constants(Thread::current(), the_class->constants());
-+ ObjectLocker ol(constants, Thread::current()); // lock constant pool while we query it
-+
-+ JvmtiClassFileReconstituter reconstituter(the_class);
-+ if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
-+ return reconstituter.get_error();
-+ }
-+
-+ *class_byte_count = (jint)reconstituter.class_file_size();
-+ *class_bytes = (unsigned char*)reconstituter.class_file_bytes();
-+
-+ } else {
-+
-+ // it is cached, get it from the cache
-+ *class_byte_count = the_class->get_cached_class_file_len();
-+ *class_bytes = the_class->get_cached_class_file_bytes();
-+ }
-+
-+ } else {
-+
-+ // Redefine with bytecodes at index j
-+ *class_bytes = _class_defs[j].class_bytes;
-+ *class_byte_count = _class_defs[j].class_byte_count;
-+ }
-+
-+ return JVMTI_ERROR_NONE;
-+}
-+
-+// Prologue of the VM operation, called on the Java thread in parallel to normal program execution
-+bool VM_RedefineClasses::doit_prologue() {
-+
-+ _revision_number++;
-+ RC_TRACE(0x00000001, ("Redefinition with revision number %d started!", _revision_number));
-+
-+ assert(Thread::current()->is_Java_thread(), "must be Java thread");
-+ RC_TIMER_START(_timer_prologue);
-+
-+ if (!check_arguments()) {
-+ RC_TIMER_STOP(_timer_prologue);
-+ return false;
-+ }
-
- // We first load new class versions in the prologue, because somewhere down the
- // call chain it is required that the current thread is a Java thread.
-- _res = load_new_class_versions(Thread::current());
-- if (_res != JVMTI_ERROR_NONE) {
-- // Free os::malloc allocated memory in load_new_class_version.
-- os::free(_scratch_classes);
-- RC_TIMER_STOP(_timer_vm_op_prologue);
-+ _new_classes = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<instanceKlassHandle>(5, true);
-+ _result = load_new_class_versions(Thread::current());
-+
-+ RC_TRACE(0x00000001, ("Loaded new class versions!"));
-+ if (_result != JVMTI_ERROR_NONE) {
-+ RC_TRACE(0x00000001, ("error occured: %d!", _result));
-+ delete _new_classes;
-+ _new_classes = NULL;
-+ RC_TIMER_STOP(_timer_prologue);
- return false;
- }
-
-- RC_TIMER_STOP(_timer_vm_op_prologue);
-+ RC_TRACE(0x00000001, ("nearly finished"));
-+ VM_GC_Operation::doit_prologue();
-+ RC_TIMER_STOP(_timer_prologue);
-+ RC_TRACE(0x00000001, ("doit_prologue finished!"));
- return true;
- }
-
--void VM_RedefineClasses::doit() {
-- Thread *thread = Thread::current();
-+// Checks basic properties of the arguments of the redefinition command.
-+bool VM_RedefineClasses::check_arguments() {
-
-- if (UseSharedSpaces) {
-- // Sharing is enabled so we remap the shared readonly space to
-- // shared readwrite, private just in case we need to redefine
-- // a shared class. We do the remap during the doit() phase of
-- // the safepoint to be safer.
-- if (!CompactingPermGenGen::remap_shared_readonly_as_readwrite()) {
-- RC_TRACE_WITH_THREAD(0x00000001, thread,
-- ("failed to remap shared readonly space to readwrite, private"));
-- _res = JVMTI_ERROR_INTERNAL;
-- return;
-- }
-- }
--
-+ if (_class_count == 0) RC_ABORT(JVMTI_ERROR_NONE);
-+ if (_class_defs == NULL) RC_ABORT(JVMTI_ERROR_NULL_POINTER);
- for (int i = 0; i < _class_count; i++) {
-- redefine_single_class(_class_defs[i].klass, _scratch_classes[i], thread);
-+ if (_class_defs[i].klass == NULL) RC_ABORT(JVMTI_ERROR_INVALID_CLASS);
-+ if (_class_defs[i].class_byte_count == 0) RC_ABORT(JVMTI_ERROR_INVALID_CLASS_FORMAT);
-+ if (_class_defs[i].class_bytes == NULL) RC_ABORT(JVMTI_ERROR_NULL_POINTER);
- }
-- // Disable any dependent concurrent compilations
-- SystemDictionary::notice_modification();
-
-- // Set flag indicating that some invariants are no longer true.
-- // See jvmtiExport.hpp for detailed explanation.
-- JvmtiExport::set_has_redefined_a_class();
--
--// check_class() is optionally called for product bits, but is
--// always called for non-product bits.
--#ifdef PRODUCT
-- if (RC_TRACE_ENABLED(0x00004000)) {
--#endif
-- RC_TRACE_WITH_THREAD(0x00004000, thread, ("calling check_class"));
-- SystemDictionary::classes_do(check_class, thread);
--#ifdef PRODUCT
-- }
--#endif
--}
--
--void VM_RedefineClasses::doit_epilogue() {
-- // Free os::malloc allocated memory.
-- // The memory allocated in redefine will be free'ed in next VM operation.
-- os::free(_scratch_classes);
--
-- if (RC_TRACE_ENABLED(0x00000004)) {
-- // Used to have separate timers for "doit" and "all", but the timer
-- // overhead skewed the measurements.
-- jlong doit_time = _timer_rsc_phase1.milliseconds() +
-- _timer_rsc_phase2.milliseconds();
-- jlong all_time = _timer_vm_op_prologue.milliseconds() + doit_time;
--
-- RC_TRACE(0x00000004, ("vm_op: all=" UINT64_FORMAT
-- " prologue=" UINT64_FORMAT " doit=" UINT64_FORMAT, all_time,
-- _timer_vm_op_prologue.milliseconds(), doit_time));
-- RC_TRACE(0x00000004,
-- ("redefine_single_class: phase1=" UINT64_FORMAT " phase2=" UINT64_FORMAT,
-- _timer_rsc_phase1.milliseconds(), _timer_rsc_phase2.milliseconds()));
-- }
--}
--
--bool VM_RedefineClasses::is_modifiable_class(oop klass_mirror) {
-- // classes for primitives cannot be redefined
-- if (java_lang_Class::is_primitive(klass_mirror)) {
-- return false;
-- }
-- klassOop the_class_oop = java_lang_Class::as_klassOop(klass_mirror);
-- // classes for arrays cannot be redefined
-- if (the_class_oop == NULL || !Klass::cast(the_class_oop)->oop_is_instance()) {
-- return false;
-- }
- return true;
- }
-
--// Append the current entry at scratch_i in scratch_cp to *merge_cp_p
--// where the end of *merge_cp_p is specified by *merge_cp_length_p. For
--// direct CP entries, there is just the current entry to append. For
--// indirect and double-indirect CP entries, there are zero or more
--// referenced CP entries along with the current entry to append.
--// Indirect and double-indirect CP entries are handled by recursive
--// calls to append_entry() as needed. The referenced CP entries are
--// always appended to *merge_cp_p before the referee CP entry. These
--// referenced CP entries may already exist in *merge_cp_p in which case
--// there is nothing extra to append and only the current entry is
--// appended.
--void VM_RedefineClasses::append_entry(constantPoolHandle scratch_cp,
-- int scratch_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p,
-- TRAPS) {
-+jvmtiError VM_RedefineClasses::check_exception() const {
-+ Thread* THREAD = Thread::current();
-+ if (HAS_PENDING_EXCEPTION) {
-
-- // append is different depending on entry tag type
-- switch (scratch_cp->tag_at(scratch_i).value()) {
-+ Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
-+ RC_TRACE(0x00000001, ("parse_stream exception: '%s'",
-+ ex_name->as_C_string()));
-+ if (TraceRedefineClasses >= 1) {
-+ java_lang_Throwable::print(PENDING_EXCEPTION, tty);
-+ tty->print_cr("");
-+ }
-+ CLEAR_PENDING_EXCEPTION;
-
-- // The old verifier is implemented outside the VM. It loads classes,
-- // but does not resolve constant pool entries directly so we never
-- // see Class entries here with the old verifier. Similarly the old
-- // verifier does not like Class entries in the input constant pool.
-- // The split-verifier is implemented in the VM so it can optionally
-- // and directly resolve constant pool entries to load classes. The
-- // split-verifier can accept either Class entries or UnresolvedClass
-- // entries in the input constant pool. We revert the appended copy
-- // back to UnresolvedClass so that either verifier will be happy
-- // with the constant pool entry.
-- case JVM_CONSTANT_Class:
-- {
-- // revert the copy to JVM_CONSTANT_UnresolvedClass
-- (*merge_cp_p)->unresolved_klass_at_put(*merge_cp_length_p,
-- scratch_cp->klass_name_at(scratch_i));
--
-- if (scratch_i != *merge_cp_length_p) {
-- // The new entry in *merge_cp_p is at a different index than
-- // the new entry in scratch_cp so we need to map the index values.
-- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
-- }
-- (*merge_cp_length_p)++;
-- } break;
--
-- // these are direct CP entries so they can be directly appended,
-- // but double and long take two constant pool entries
-- case JVM_CONSTANT_Double: // fall through
-- case JVM_CONSTANT_Long:
-- {
-- constantPoolOopDesc::copy_entry_to(scratch_cp, scratch_i, *merge_cp_p, *merge_cp_length_p,
-- THREAD);
--
-- if (scratch_i != *merge_cp_length_p) {
-- // The new entry in *merge_cp_p is at a different index than
-- // the new entry in scratch_cp so we need to map the index values.
-- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
-- }
-- (*merge_cp_length_p) += 2;
-- } break;
--
-- // these are direct CP entries so they can be directly appended
-- case JVM_CONSTANT_Float: // fall through
-- case JVM_CONSTANT_Integer: // fall through
-- case JVM_CONSTANT_Utf8: // fall through
--
-- // This was an indirect CP entry, but it has been changed into
-- // an interned string so this entry can be directly appended.
-- case JVM_CONSTANT_String: // fall through
--
-- // These were indirect CP entries, but they have been changed into
-- // Symbol*s so these entries can be directly appended.
-- case JVM_CONSTANT_UnresolvedClass: // fall through
-- case JVM_CONSTANT_UnresolvedString:
-- {
-- constantPoolOopDesc::copy_entry_to(scratch_cp, scratch_i, *merge_cp_p, *merge_cp_length_p,
-- THREAD);
--
-- if (scratch_i != *merge_cp_length_p) {
-- // The new entry in *merge_cp_p is at a different index than
-- // the new entry in scratch_cp so we need to map the index values.
-- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
-- }
-- (*merge_cp_length_p)++;
-- } break;
--
-- // this is an indirect CP entry so it needs special handling
-- case JVM_CONSTANT_NameAndType:
-- {
-- int name_ref_i = scratch_cp->name_ref_index_at(scratch_i);
-- int new_name_ref_i = find_or_append_indirect_entry(scratch_cp, name_ref_i, merge_cp_p,
-- merge_cp_length_p, THREAD);
--
-- int signature_ref_i = scratch_cp->signature_ref_index_at(scratch_i);
-- int new_signature_ref_i = find_or_append_indirect_entry(scratch_cp, signature_ref_i,
-- merge_cp_p, merge_cp_length_p,
-- THREAD);
--
-- // If the referenced entries already exist in *merge_cp_p, then
-- // both new_name_ref_i and new_signature_ref_i will both be 0.
-- // In that case, all we are appending is the current entry.
-- if (new_name_ref_i != name_ref_i) {
-- RC_TRACE(0x00080000,
-- ("NameAndType entry@%d name_ref_index change: %d to %d",
-- *merge_cp_length_p, name_ref_i, new_name_ref_i));
-- }
-- if (new_signature_ref_i != signature_ref_i) {
-- RC_TRACE(0x00080000,
-- ("NameAndType entry@%d signature_ref_index change: %d to %d",
-- *merge_cp_length_p, signature_ref_i, new_signature_ref_i));
-- }
--
-- (*merge_cp_p)->name_and_type_at_put(*merge_cp_length_p,
-- new_name_ref_i, new_signature_ref_i);
-- if (scratch_i != *merge_cp_length_p) {
-- // The new entry in *merge_cp_p is at a different index than
-- // the new entry in scratch_cp so we need to map the index values.
-- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
-- }
-- (*merge_cp_length_p)++;
-- } break;
--
-- // this is a double-indirect CP entry so it needs special handling
-- case JVM_CONSTANT_Fieldref: // fall through
-- case JVM_CONSTANT_InterfaceMethodref: // fall through
-- case JVM_CONSTANT_Methodref:
-- {
-- int klass_ref_i = scratch_cp->uncached_klass_ref_index_at(scratch_i);
-- int new_klass_ref_i = find_or_append_indirect_entry(scratch_cp, klass_ref_i,
-- merge_cp_p, merge_cp_length_p, THREAD);
-- int name_and_type_ref_i = scratch_cp->uncached_name_and_type_ref_index_at(scratch_i);
-- int new_name_and_type_ref_i = find_or_append_indirect_entry(scratch_cp, name_and_type_ref_i,
-- merge_cp_p, merge_cp_length_p, THREAD);
--
-- const char *entry_name;
-- switch (scratch_cp->tag_at(scratch_i).value()) {
-- case JVM_CONSTANT_Fieldref:
-- entry_name = "Fieldref";
-- (*merge_cp_p)->field_at_put(*merge_cp_length_p, new_klass_ref_i,
-- new_name_and_type_ref_i);
-- break;
-- case JVM_CONSTANT_InterfaceMethodref:
-- entry_name = "IFMethodref";
-- (*merge_cp_p)->interface_method_at_put(*merge_cp_length_p,
-- new_klass_ref_i, new_name_and_type_ref_i);
-- break;
-- case JVM_CONSTANT_Methodref:
-- entry_name = "Methodref";
-- (*merge_cp_p)->method_at_put(*merge_cp_length_p, new_klass_ref_i,
-- new_name_and_type_ref_i);
-- break;
-- default:
-- guarantee(false, "bad switch");
-- break;
-- }
--
-- if (klass_ref_i != new_klass_ref_i) {
-- RC_TRACE(0x00080000, ("%s entry@%d class_index changed: %d to %d",
-- entry_name, *merge_cp_length_p, klass_ref_i, new_klass_ref_i));
-- }
-- if (name_and_type_ref_i != new_name_and_type_ref_i) {
-- RC_TRACE(0x00080000,
-- ("%s entry@%d name_and_type_index changed: %d to %d",
-- entry_name, *merge_cp_length_p, name_and_type_ref_i,
-- new_name_and_type_ref_i));
-- }
--
-- if (scratch_i != *merge_cp_length_p) {
-- // The new entry in *merge_cp_p is at a different index than
-- // the new entry in scratch_cp so we need to map the index values.
-- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
-- }
-- (*merge_cp_length_p)++;
-- } break;
--
-- // this is an indirect CP entry so it needs special handling
-- case JVM_CONSTANT_MethodType:
-- {
-- int ref_i = scratch_cp->method_type_index_at(scratch_i);
-- int new_ref_i = find_or_append_indirect_entry(scratch_cp, ref_i, merge_cp_p,
-- merge_cp_length_p, THREAD);
-- if (new_ref_i != ref_i) {
-- RC_TRACE(0x00080000,
-- ("MethodType entry@%d ref_index change: %d to %d",
-- *merge_cp_length_p, ref_i, new_ref_i));
-- }
-- (*merge_cp_p)->method_type_index_at_put(*merge_cp_length_p, new_ref_i);
-- if (scratch_i != *merge_cp_length_p) {
-- // The new entry in *merge_cp_p is at a different index than
-- // the new entry in scratch_cp so we need to map the index values.
-- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
-- }
-- (*merge_cp_length_p)++;
-- } break;
--
-- // this is an indirect CP entry so it needs special handling
-- case JVM_CONSTANT_MethodHandle:
-- {
-- int ref_kind = scratch_cp->method_handle_ref_kind_at(scratch_i);
-- int ref_i = scratch_cp->method_handle_index_at(scratch_i);
-- int new_ref_i = find_or_append_indirect_entry(scratch_cp, ref_i, merge_cp_p,
-- merge_cp_length_p, THREAD);
-- if (new_ref_i != ref_i) {
-- RC_TRACE(0x00080000,
-- ("MethodHandle entry@%d ref_index change: %d to %d",
-- *merge_cp_length_p, ref_i, new_ref_i));
-- }
-- (*merge_cp_p)->method_handle_index_at_put(*merge_cp_length_p, ref_kind, new_ref_i);
-- if (scratch_i != *merge_cp_length_p) {
-- // The new entry in *merge_cp_p is at a different index than
-- // the new entry in scratch_cp so we need to map the index values.
-- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
-- }
-- (*merge_cp_length_p)++;
-- } break;
--
-- // this is an indirect CP entry so it needs special handling
-- case JVM_CONSTANT_InvokeDynamic:
-- {
-- // Index of the bootstrap specifier in the operands array
-- int old_bs_i = scratch_cp->invoke_dynamic_bootstrap_specifier_index(scratch_i);
-- int new_bs_i = find_or_append_operand(scratch_cp, old_bs_i, merge_cp_p,
-- merge_cp_length_p, THREAD);
-- // The bootstrap method NameAndType_info index
-- int old_ref_i = scratch_cp->invoke_dynamic_name_and_type_ref_index_at(scratch_i);
-- int new_ref_i = find_or_append_indirect_entry(scratch_cp, old_ref_i, merge_cp_p,
-- merge_cp_length_p, THREAD);
-- if (new_bs_i != old_bs_i) {
-- RC_TRACE(0x00080000,
-- ("InvokeDynamic entry@%d bootstrap_method_attr_index change: %d to %d",
-- *merge_cp_length_p, old_bs_i, new_bs_i));
-- }
-- if (new_ref_i != old_ref_i) {
-- RC_TRACE(0x00080000,
-- ("InvokeDynamic entry@%d name_and_type_index change: %d to %d",
-- *merge_cp_length_p, old_ref_i, new_ref_i));
-- }
--
-- (*merge_cp_p)->invoke_dynamic_at_put(*merge_cp_length_p, new_bs_i, new_ref_i);
-- if (scratch_i != *merge_cp_length_p) {
-- // The new entry in *merge_cp_p is at a different index than
-- // the new entry in scratch_cp so we need to map the index values.
-- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
-- }
-- (*merge_cp_length_p)++;
-- } break;
--
-- // At this stage, Class or UnresolvedClass could be here, but not
-- // ClassIndex
-- case JVM_CONSTANT_ClassIndex: // fall through
--
-- // Invalid is used as the tag for the second constant pool entry
-- // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
-- // not be seen by itself.
-- case JVM_CONSTANT_Invalid: // fall through
--
-- // At this stage, String or UnresolvedString could be here, but not
-- // StringIndex
-- case JVM_CONSTANT_StringIndex: // fall through
--
-- // At this stage JVM_CONSTANT_UnresolvedClassInError should not be
-- // here
-- case JVM_CONSTANT_UnresolvedClassInError: // fall through
--
-- default:
-- {
-- // leave a breadcrumb
-- jbyte bad_value = scratch_cp->tag_at(scratch_i).value();
-- ShouldNotReachHere();
-- } break;
-- } // end switch tag value
--} // end append_entry()
--
--
--int VM_RedefineClasses::find_or_append_indirect_entry(constantPoolHandle scratch_cp,
-- int ref_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS) {
--
-- int new_ref_i = ref_i;
-- bool match = (ref_i < *merge_cp_length_p) &&
-- scratch_cp->compare_entry_to(ref_i, *merge_cp_p, ref_i, THREAD);
--
-- if (!match) {
-- // forward reference in *merge_cp_p or not a direct match
-- int found_i = scratch_cp->find_matching_entry(ref_i, *merge_cp_p, THREAD);
-- if (found_i != 0) {
-- guarantee(found_i != ref_i, "compare_entry_to() and find_matching_entry() do not agree");
-- // Found a matching entry somewhere else in *merge_cp_p so just need a mapping entry.
-- new_ref_i = found_i;
-- map_index(scratch_cp, ref_i, found_i);
-+ if (ex_name == vmSymbols::java_lang_UnsupportedClassVersionError()) {
-+ return JVMTI_ERROR_UNSUPPORTED_VERSION;
-+ } else if (ex_name == vmSymbols::java_lang_ClassFormatError()) {
-+ return JVMTI_ERROR_INVALID_CLASS_FORMAT;
-+ } else if (ex_name == vmSymbols::java_lang_ClassCircularityError()) {
-+ return JVMTI_ERROR_CIRCULAR_CLASS_DEFINITION;
-+ } else if (ex_name == vmSymbols::java_lang_NoClassDefFoundError()) {
-+ // The message will be "XXX (wrong name: YYY)"
-+ return JVMTI_ERROR_NAMES_DONT_MATCH;
-+ } else if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) {
-+ return JVMTI_ERROR_OUT_OF_MEMORY;
- } else {
-- // no match found so we have to append this entry to *merge_cp_p
-- append_entry(scratch_cp, ref_i, merge_cp_p, merge_cp_length_p, THREAD);
-- // The above call to append_entry() can only append one entry
-- // so the post call query of *merge_cp_length_p is only for
-- // the sake of consistency.
-- new_ref_i = *merge_cp_length_p - 1;
-+ // Just in case more exceptions can be thrown..
-+ return JVMTI_ERROR_FAILS_VERIFICATION;
- }
- }
-
-- return new_ref_i;
--} // end find_or_append_indirect_entry()
--
--
--// Append a bootstrap specifier into the merge_cp operands that is semantically equal
--// to the scratch_cp operands bootstrap specifier passed by the old_bs_i index.
--// Recursively append new merge_cp entries referenced by the new bootstrap specifier.
--void VM_RedefineClasses::append_operand(constantPoolHandle scratch_cp, int old_bs_i,
-- constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS) {
--
-- int old_ref_i = scratch_cp->operand_bootstrap_method_ref_index_at(old_bs_i);
-- int new_ref_i = find_or_append_indirect_entry(scratch_cp, old_ref_i, merge_cp_p,
-- merge_cp_length_p, THREAD);
-- if (new_ref_i != old_ref_i) {
-- RC_TRACE(0x00080000,
-- ("operands entry@%d bootstrap method ref_index change: %d to %d",
-- _operands_cur_length, old_ref_i, new_ref_i));
-- }
--
-- typeArrayOop merge_ops = (*merge_cp_p)->operands();
-- int new_bs_i = _operands_cur_length;
-- // We have _operands_cur_length == 0 when the merge_cp operands is empty yet.
-- // However, the operand_offset_at(0) was set in the extend_operands() call.
-- int new_base = (new_bs_i == 0) ? (*merge_cp_p)->operand_offset_at(0)
-- : (*merge_cp_p)->operand_next_offset_at(new_bs_i - 1);
-- int argc = scratch_cp->operand_argument_count_at(old_bs_i);
--
-- constantPoolOopDesc::operand_offset_at_put(merge_ops, _operands_cur_length, new_base);
-- merge_ops->short_at_put(new_base++, new_ref_i);
-- merge_ops->short_at_put(new_base++, argc);
--
-- for (int i = 0; i < argc; i++) {
-- int old_arg_ref_i = scratch_cp->operand_argument_index_at(old_bs_i, i);
-- int new_arg_ref_i = find_or_append_indirect_entry(scratch_cp, old_arg_ref_i, merge_cp_p,
-- merge_cp_length_p, THREAD);
-- merge_ops->short_at_put(new_base++, new_arg_ref_i);
-- if (new_arg_ref_i != old_arg_ref_i) {
-- RC_TRACE(0x00080000,
-- ("operands entry@%d bootstrap method argument ref_index change: %d to %d",
-- _operands_cur_length, old_arg_ref_i, new_arg_ref_i));
-- }
-- }
-- if (old_bs_i != _operands_cur_length) {
-- // The bootstrap specifier in *merge_cp_p is at a different index than
-- // that in scratch_cp so we need to map the index values.
-- map_operand_index(old_bs_i, new_bs_i);
-- }
-- _operands_cur_length++;
--} // end append_operand()
--
--
--int VM_RedefineClasses::find_or_append_operand(constantPoolHandle scratch_cp,
-- int old_bs_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS) {
--
-- int new_bs_i = old_bs_i; // bootstrap specifier index
-- bool match = (old_bs_i < _operands_cur_length) &&
-- scratch_cp->compare_operand_to(old_bs_i, *merge_cp_p, old_bs_i, THREAD);
--
-- if (!match) {
-- // forward reference in *merge_cp_p or not a direct match
-- int found_i = scratch_cp->find_matching_operand(old_bs_i, *merge_cp_p,
-- _operands_cur_length, THREAD);
-- if (found_i != -1) {
-- guarantee(found_i != old_bs_i, "compare_operand_to() and find_matching_operand() disagree");
-- // found a matching operand somewhere else in *merge_cp_p so just need a mapping
-- new_bs_i = found_i;
-- map_operand_index(old_bs_i, found_i);
-- } else {
-- // no match found so we have to append this bootstrap specifier to *merge_cp_p
-- append_operand(scratch_cp, old_bs_i, merge_cp_p, merge_cp_length_p, THREAD);
-- new_bs_i = _operands_cur_length - 1;
-- }
-- }
-- return new_bs_i;
--} // end find_or_append_operand()
--
--
--void VM_RedefineClasses::finalize_operands_merge(constantPoolHandle merge_cp, TRAPS) {
-- if (merge_cp->operands() == NULL) {
-- return;
-- }
-- // Shrink the merge_cp operands
-- merge_cp->shrink_operands(_operands_cur_length, CHECK);
--
-- if (RC_TRACE_ENABLED(0x00040000)) {
-- // don't want to loop unless we are tracing
-- int count = 0;
-- for (int i = 1; i < _operands_index_map_p->length(); i++) {
-- int value = _operands_index_map_p->at(i);
-- if (value != -1) {
-- RC_TRACE_WITH_THREAD(0x00040000, THREAD,
-- ("operands_index_map[%d]: old=%d new=%d", count, i, value));
-- count++;
-- }
-- }
-- }
-- // Clean-up
-- _operands_index_map_p = NULL;
-- _operands_cur_length = 0;
-- _operands_index_map_count = 0;
--} // end finalize_operands_merge()
--
--
--void VM_RedefineClasses::swap_all_method_annotations(int i, int j, instanceKlassHandle scratch_class) {
-- typeArrayOop save;
--
-- save = scratch_class->get_method_annotations_of(i);
-- scratch_class->set_method_annotations_of(i, scratch_class->get_method_annotations_of(j));
-- scratch_class->set_method_annotations_of(j, save);
--
-- save = scratch_class->get_method_parameter_annotations_of(i);
-- scratch_class->set_method_parameter_annotations_of(i, scratch_class->get_method_parameter_annotations_of(j));
-- scratch_class->set_method_parameter_annotations_of(j, save);
--
-- save = scratch_class->get_method_default_annotations_of(i);
-- scratch_class->set_method_default_annotations_of(i, scratch_class->get_method_default_annotations_of(j));
-- scratch_class->set_method_default_annotations_of(j, save);
-+ return JVMTI_ERROR_NONE;
- }
-
-+// Loads all new class versions and stores the instanceKlass handles in an array.
-+jvmtiError VM_RedefineClasses::load_new_class_versions(TRAPS) {
-
--jvmtiError VM_RedefineClasses::compare_and_normalize_class_versions(
-- instanceKlassHandle the_class,
-- instanceKlassHandle scratch_class) {
-+ ResourceMark rm(THREAD);
-+
-+ RC_TRACE(0x00000001, ("==================================================================="));
-+ RC_TRACE(0x00000001, ("load new class versions (%d)",
-+ _class_count));
-+
-+ // Retrieve an array of all classes that need to be redefined
-+ GrowableArray<instanceKlassHandle> all_affected_klasses;
-+ jvmtiError err = find_sorted_affected_classes(&all_affected_klasses);
-+ if (err != JVMTI_ERROR_NONE) {
-+ RC_TRACE(0x00000001, ("Error finding sorted affected classes: %d",
-+ (int)err));
-+ return err;
-+ }
-+
-+
-+ JvmtiThreadState *state = JvmtiThreadState::state_for(JavaThread::current());
-+
-+ _max_redefinition_flags = Klass::NoRedefinition;
-+ jvmtiError result = JVMTI_ERROR_NONE;
-+
-+ for (int i=0; i<all_affected_klasses.length(); i++) {
-+ RC_TRACE(0x00000002, ("Processing affected class %d of %d",
-+ i+1, all_affected_klasses.length()));
-+
-+ instanceKlassHandle the_class = all_affected_klasses.at(i);
-+ RC_TRACE(0x00000002, ("name=%s",
-+ the_class->name()->as_C_string()));
-+
-+ the_class->link_class(THREAD);
-+ result = check_exception();
-+ if (result != JVMTI_ERROR_NONE) break;
-+
-+ // Find new class bytes
-+ const unsigned char* class_bytes;
-+ jint class_byte_count;
-+ jvmtiError error;
-+ jboolean not_changed;
-+ if ((error = find_class_bytes(the_class, &class_bytes, &class_byte_count, ¬_changed)) != JVMTI_ERROR_NONE) {
-+ RC_TRACE(0x00000001, ("Error finding class bytes: %d",
-+ (int)error));
-+ result = error;
-+ break;
-+ }
-+ assert(class_bytes != NULL && class_byte_count != 0, "Class bytes defined at this point!");
-+
-+
-+ // Set redefined class handle in JvmtiThreadState class.
-+ // This redefined class is sent to agent event handler for class file
-+ // load hook event.
-+ state->set_class_being_redefined(&the_class, _class_load_kind);
-+
-+ RC_TRACE(0x00000002, ("Before resolving from stream"));
-+
-+ RC_TIMER_STOP(_timer_prologue);
-+ RC_TIMER_START(_timer_class_loading);
-+
-+
-+ // Parse the stream.
-+ Handle the_class_loader(THREAD, the_class->class_loader());
-+ Handle protection_domain(THREAD, the_class->protection_domain());
-+ Symbol* the_class_sym = the_class->name();
-+ ClassFileStream st((u1*) class_bytes, class_byte_count, (char *)"__VM_RedefineClasses__");
-+ instanceKlassHandle new_class(THREAD, SystemDictionary::resolve_from_stream(the_class_sym,
-+ the_class_loader,
-+ protection_domain,
-+ &st,
-+ true,
-+ the_class,
-+ THREAD));
-+
-+ not_changed = false;
-+
-+ RC_TIMER_STOP(_timer_class_loading);
-+ RC_TIMER_START(_timer_prologue);
-+
-+ RC_TRACE(0x00000002, ("After resolving class from stream!"));
-+ // Clear class_being_redefined just to be sure.
-+ state->clear_class_being_redefined();
-+
-+ result = check_exception();
-+ if (result != JVMTI_ERROR_NONE) break;
-+
-+#ifdef ASSERT
-+
-+ assert(new_class() != NULL, "Class could not be loaded!");
-+ assert(new_class() != the_class(), "must be different");
-+ assert(new_class->new_version() == NULL && new_class->old_version() != NULL, "");
-+
-+
-+ objArrayOop k_interfaces = new_class->local_interfaces();
-+ for (int j=0; j<k_interfaces->length(); j++) {
-+ assert(((klassOop)k_interfaces->obj_at(j))->klass_part()->is_newest_version(), "just checking");
-+ }
-+
-+ if (!THREAD->is_Compiler_thread()) {
-+
-+ RC_TRACE(0x00000002, ("name=%s loader="INTPTR_FORMAT" protection_domain="INTPTR_FORMAT" ",
-+ the_class->name()->as_C_string(),
-+ (address)(the_class->class_loader()),
-+ (address)(the_class->protection_domain())));
-+ // If we are on the compiler thread, we must not try to resolve a class.
-+ klassOop systemLookup = SystemDictionary::resolve_or_null(the_class->name(), the_class->class_loader(), the_class->protection_domain(), THREAD);
-+
-+ if (systemLookup != NULL) {
-+ assert(systemLookup == new_class->old_version(), "Old class must be in system dictionary!");
-+
-+
-+ Klass *subklass = new_class()->klass_part()->subklass();
-+ while (subklass != NULL) {
-+ assert(subklass->new_version() == NULL, "Most recent version of class!");
-+ subklass = subklass->next_sibling();
-+ }
-+ } else {
-+ // This can happen for reflection generated classes.. ?
-+ CLEAR_PENDING_EXCEPTION;
-+ }
-+ }
-+
-+#endif
-+
-+ if (RC_TRACE_ENABLED(0x00000001)) {
-+ if (new_class->layout_helper() != the_class->layout_helper()) {
-+ RC_TRACE(0x00000001, ("Instance size change for class %s: new=%d old=%d",
-+ new_class->name()->as_C_string(),
-+ new_class->layout_helper(),
-+ the_class->layout_helper()));
-+ }
-+ }
-+
-+ // Set the new version of the class
-+ new_class->set_revision_number(_revision_number);
-+ new_class->set_redefinition_index(i);
-+ the_class->set_new_version(new_class());
-+ _new_classes->append(new_class);
-+
-+ assert(new_class->new_version() == NULL, "");
-+
-+ int redefinition_flags = Klass::NoRedefinition;
-+
-+ if (not_changed) {
-+ redefinition_flags = Klass::NoRedefinition;
-+ } else if (AllowAdvancedClassRedefinition) {
-+ redefinition_flags = calculate_redefinition_flags(new_class);
-+ } else {
-+ jvmtiError allowed = check_redefinition_allowed(new_class);
-+ if (allowed != JVMTI_ERROR_NONE) {
-+ RC_TRACE(0x00000001, ("Error redefinition not allowed!"));
-+ result = allowed;
-+ break;
-+ }
-+ redefinition_flags = Klass::ModifyClass;
-+ }
-+
-+ if (new_class->super() != NULL) {
-+ redefinition_flags = redefinition_flags | new_class->super()->klass_part()->redefinition_flags();
-+ }
-+
-+ for (int j=0; j<new_class->local_interfaces()->length(); j++) {
-+ redefinition_flags = redefinition_flags | ((klassOop)new_class->local_interfaces()->obj_at(j))->klass_part()->redefinition_flags();
-+ }
-+
-+ new_class->set_redefinition_flags(redefinition_flags);
-+
-+ _max_redefinition_flags = _max_redefinition_flags | redefinition_flags;
-+
-+ if ((redefinition_flags & Klass::ModifyInstances) != 0) {
-+ // TODO: Check if watch access flags of static fields are updated correctly.
-+ calculate_instance_update_information(_new_classes->at(i)());
-+ } else {
-+ assert(new_class->layout_helper() >> 1 == new_class->old_version()->klass_part()->layout_helper() >> 1, "must be equal");
-+ assert(new_class->fields()->length() == ((instanceKlass*)new_class->old_version()->klass_part())->fields()->length(), "must be equal");
-+
-+ fieldDescriptor fd_new;
-+ fieldDescriptor fd_old;
-+ for (JavaFieldStream fs(new_class); !fs.done(); fs.next()) {
-+ fd_new.initialize(new_class(), fs.index());
-+ fd_old.initialize(new_class->old_version(), fs.index());
-+ transfer_special_access_flags(&fd_old, &fd_new);
-+ }
-+ }
-+
-+ if (RC_TRACE_ENABLED(0x00000008)) {
-+ if (new_class->super() != NULL) {
-+ RC_TRACE(0x00000008, ("Super class is %s",
-+ new_class->super()->klass_part()->name()->as_C_string()));
-+ }
-+ }
-+
-+#ifdef ASSERT
-+ assert(new_class->super() == NULL || new_class->super()->klass_part()->new_version() == NULL, "Super klass must be newest version!");
-+
-+ the_class->vtable()->verify(tty);
-+ new_class->vtable()->verify(tty);
-+#endif
-+
-+ RC_TRACE(0x00000002, ("Verification done!"));
-+
-+ if (i == all_affected_klasses.length() - 1) {
-+
-+ // This was the last class processed => check if additional classes have been loaded in the meantime
-+
-+ RC_TIMER_STOP(_timer_prologue);
-+ lock_threads();
-+ RC_TIMER_START(_timer_prologue);
-+
-+ for (int j=0; j<all_affected_klasses.length(); j++) {
-+
-+ klassOop initial_klass = all_affected_klasses.at(j)();
-+ Klass *initial_subklass = initial_klass->klass_part()->subklass();
-+ Klass *cur_klass = initial_subklass;
-+ while(cur_klass != NULL) {
-+
-+ if(cur_klass->oop_is_instance() && cur_klass->is_newest_version()) {
-+ instanceKlassHandle handle(THREAD, cur_klass->as_klassOop());
-+ if (!all_affected_klasses.contains(handle)) {
-+
-+ int k = i + 1;
-+ for (; k<all_affected_klasses.length(); k++) {
-+ if (all_affected_klasses.at(k)->is_subtype_of(cur_klass->as_klassOop())) {
-+ break;
-+ }
-+ }
-+ all_affected_klasses.insert_before(k, handle);
-+ RC_TRACE(0x00000002, ("Adding newly loaded class to affected classes: %s",
-+ cur_klass->name()->as_C_string()));
-+ }
-+ }
-+
-+ cur_klass = cur_klass->next_sibling();
-+ }
-+ }
-+
-+ int new_count = all_affected_klasses.length() - 1 - i;
-+ if (new_count != 0) {
-+
-+ unlock_threads();
-+ RC_TRACE(0x00000001, ("Found new number of affected classes: %d",
-+ new_count));
-+ }
-+ }
-+ }
-+
-+ if (result != JVMTI_ERROR_NONE) {
-+ rollback();
-+ return result;
-+ }
-+
-+ RC_TIMER_STOP(_timer_prologue);
-+ RC_TIMER_START(_timer_class_linking);
-+ // Link and verify new classes _after_ all classes have been updated in the system dictionary!
-+ for (int i=0; i<all_affected_klasses.length(); i++) {
-+ instanceKlassHandle the_class = all_affected_klasses.at(i);
-+ instanceKlassHandle new_class(the_class->new_version());
-+
-+ RC_TRACE(0x00000002, ("Linking class %d/%d %s",
-+ i,
-+ all_affected_klasses.length(),
-+ the_class->name()->as_C_string()));
-+ new_class->link_class(THREAD);
-+
-+ result = check_exception();
-+ if (result != JVMTI_ERROR_NONE) break;
-+ }
-+ RC_TIMER_STOP(_timer_class_linking);
-+ RC_TIMER_START(_timer_prologue);
-+
-+ if (result != JVMTI_ERROR_NONE) {
-+ rollback();
-+ return result;
-+ }
-+
-+ RC_TRACE(0x00000002, ("All classes loaded!"));
-+
-+#ifdef ASSERT
-+ for (int i=0; i<all_affected_klasses.length(); i++) {
-+ instanceKlassHandle the_class = all_affected_klasses.at(i);
-+ assert(the_class->new_version() != NULL, "Must have been redefined");
-+ instanceKlassHandle new_version = instanceKlassHandle(THREAD, the_class->new_version());
-+ assert(new_version->new_version() == NULL, "Must be newest version");
-+
-+ if (!(new_version->super() == NULL || new_version->super()->klass_part()->new_version() == NULL)) {
-+ new_version()->print();
-+ new_version->super()->print();
-+ }
-+ assert(new_version->super() == NULL || new_version->super()->klass_part()->new_version() == NULL, "Super class must be newest version");
-+ }
-+
-+ SystemDictionary::classes_do(check_class, THREAD);
-+
-+#endif
-+
-+ RC_TRACE(0x00000001, ("Finished verification!"));
-+ return JVMTI_ERROR_NONE;
-+}
-+
-+void VM_RedefineClasses::lock_threads() {
-+
-+ RC_TIMER_START(_timer_wait_for_locks);
-+
-+
-+ JavaThread *javaThread = Threads::first();
-+ while (javaThread != NULL) {
-+ if (javaThread->is_Compiler_thread() && javaThread != Thread::current()) {
-+ CompilerThread *compilerThread = (CompilerThread *)javaThread;
-+ compilerThread->set_should_bailout(true);
-+ }
-+ javaThread = javaThread->next();
-+ }
-+
-+ int cnt = 0;
-+ javaThread = Threads::first();
-+ while (javaThread != NULL) {
-+ if (javaThread->is_Compiler_thread() && javaThread != Thread::current()) {
-+ CompilerThread *compilerThread = (CompilerThread *)javaThread;
-+ compilerThread->compilation_mutex()->lock();
-+ cnt++;
-+ }
-+ javaThread = javaThread->next();
-+ }
-+
-+ RC_TRACE(0x00000002, ("Locked %d compiler threads", cnt));
-+
-+ cnt = 0;
-+ javaThread = Threads::first();
-+ while (javaThread != NULL) {
-+ if (javaThread != Thread::current()) {
-+ javaThread->redefine_classes_mutex()->lock();
-+ }
-+ javaThread = javaThread->next();
-+ }
-+
-+
-+ RC_TRACE(0x00000002, ("Locked %d threads", cnt));
-+
-+ RC_TIMER_STOP(_timer_wait_for_locks);
-+}
-+
-+void VM_RedefineClasses::unlock_threads() {
-+
-+ int cnt = 0;
-+ JavaThread *javaThread = Threads::first();
-+ Thread *thread = Thread::current();
-+ while (javaThread != NULL) {
-+ if (javaThread->is_Compiler_thread() && javaThread != Thread::current()) {
-+ CompilerThread *compilerThread = (CompilerThread *)javaThread;
-+ if (compilerThread->compilation_mutex()->owned_by_self()) {
-+ compilerThread->compilation_mutex()->unlock();
-+ cnt++;
-+ }
-+ }
-+ javaThread = javaThread->next();
-+ }
-+
-+ RC_TRACE(0x00000002, ("Unlocked %d compiler threads", cnt));
-+
-+ cnt = 0;
-+ javaThread = Threads::first();
-+ while (javaThread != NULL) {
-+ if (javaThread != Thread::current()) {
-+ if (javaThread->redefine_classes_mutex()->owned_by_self()) {
-+ javaThread->redefine_classes_mutex()->unlock();
-+ }
-+ }
-+ javaThread = javaThread->next();
-+ }
-+
-+ RC_TRACE(0x00000002, ("Unlocked %d threads", cnt));
-+}
-+
-+jvmtiError VM_RedefineClasses::check_redefinition_allowed(instanceKlassHandle scratch_class) {
-+
-+
-+
-+ // Compatibility mode => check for unsupported modification
-+
-+
-+ assert(scratch_class->old_version() != NULL, "must have old version");
-+ instanceKlassHandle the_class(scratch_class->old_version());
-+
- int i;
-
- // Check superclasses, or rather their names, since superclasses themselves can be
- // requested to replace.
- // Check for NULL superclass first since this might be java.lang.Object
- if (the_class->super() != scratch_class->super() &&
-- (the_class->super() == NULL || scratch_class->super() == NULL ||
-- Klass::cast(the_class->super())->name() !=
-- Klass::cast(scratch_class->super())->name())) {
-- return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED;
-+ (the_class->super() == NULL || scratch_class->super() == NULL ||
-+ Klass::cast(the_class->super())->name() !=
-+ Klass::cast(scratch_class->super())->name())) {
-+ return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED;
- }
-
- // Check if the number, names and order of directly implemented interfaces are the same.
-@@ -622,8 +678,8 @@
- }
- for (i = 0; i < n_intfs; i++) {
- if (Klass::cast((klassOop) k_interfaces->obj_at(i))->name() !=
-- Klass::cast((klassOop) k_new_interfaces->obj_at(i))->name()) {
-- return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED;
-+ Klass::cast((klassOop) k_new_interfaces->obj_at(i))->name()) {
-+ return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED;
- }
- }
-
-@@ -772,12 +828,8 @@
- idnum_owner->set_method_idnum(new_num);
- }
- k_new_method->set_method_idnum(old_num);
-- swap_all_method_annotations(old_num, new_num, scratch_class);
- }
- }
-- RC_TRACE(0x00008000, ("Method matched: new: %s [%d] == old: %s [%d]",
-- k_new_method->name_and_sig_as_C_string(), ni,
-- k_old_method->name_and_sig_as_C_string(), oi));
- // advance to next pair of methods
- ++oi;
- ++ni;
-@@ -786,11 +838,11 @@
- // method added, see if it is OK
- new_flags = (jushort) k_new_method->access_flags().get_flags();
- if ((new_flags & JVM_ACC_PRIVATE) == 0
-- // hack: private should be treated as final, but alas
-- || (new_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0
-- ) {
-- // new methods must be private
-- return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_ADDED;
-+ // hack: private should be treated as final, but alas
-+ || (new_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0
-+ ) {
-+ // new methods must be private
-+ return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_ADDED;
- }
- {
- u2 num = the_class->next_method_idnum();
-@@ -805,24 +857,19 @@
- idnum_owner->set_method_idnum(new_num);
- }
- k_new_method->set_method_idnum(num);
-- swap_all_method_annotations(new_num, num, scratch_class);
- }
-- RC_TRACE(0x00008000, ("Method added: new: %s [%d]",
-- k_new_method->name_and_sig_as_C_string(), ni));
- ++ni; // advance to next new method
- break;
- case deleted:
- // method deleted, see if it is OK
- old_flags = (jushort) k_old_method->access_flags().get_flags();
- if ((old_flags & JVM_ACC_PRIVATE) == 0
-- // hack: private should be treated as final, but alas
-- || (old_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0
-- ) {
-- // deleted methods must be private
-- return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_DELETED;
-+ // hack: private should be treated as final, but alas
-+ || (old_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0
-+ ) {
-+ // deleted methods must be private
-+ return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_DELETED;
- }
-- RC_TRACE(0x00008000, ("Method deleted: old: %s [%d]",
-- k_old_method->name_and_sig_as_C_string(), oi));
- ++oi; // advance to next old method
- break;
- default:
-@@ -833,2120 +880,2265 @@
- return JVMTI_ERROR_NONE;
- }
-
-+int VM_RedefineClasses::calculate_redefinition_flags(instanceKlassHandle new_class) {
-
--// Find new constant pool index value for old constant pool index value
--// by seaching the index map. Returns zero (0) if there is no mapped
--// value for the old constant pool index.
--int VM_RedefineClasses::find_new_index(int old_index) {
-- if (_index_map_count == 0) {
-- // map is empty so nothing can be found
-- return 0;
-+ int result = Klass::NoRedefinition;
-+
-+
-+
-+ RC_TRACE(0x00000002, ("Comparing different class versions of class %s",
-+ new_class->name()->as_C_string()));
-+
-+ assert(new_class->old_version() != NULL, "must have old version");
-+ instanceKlassHandle the_class(new_class->old_version());
-+
-+ // Check whether class is in the error init state.
-+ if (the_class->is_in_error_state()) {
-+ // TBD #5057930: special error code is needed in 1.6
-+ //result = Klass::union_redefinition_level(result, Klass::Invalid);
- }
-
-- if (old_index < 1 || old_index >= _index_map_p->length()) {
-- // The old_index is out of range so it is not mapped. This should
-- // not happen in regular constant pool merging use, but it can
-- // happen if a corrupt annotation is processed.
-- return 0;
-- }
-+ int i;
-
-- int value = _index_map_p->at(old_index);
-- if (value == -1) {
-- // the old_index is not mapped
-- return 0;
-- }
-+ //////////////////////////////////////////////////////////////////////////////////////////////////////////
-+ // Check superclasses
-+ assert(new_class->super() == NULL || new_class->super()->klass_part()->is_newest_version(), "");
-+ if (the_class->super() != new_class->super()) {
-+ // Super class changed
-
-- return value;
--} // end find_new_index()
-+ klassOop cur_klass = the_class->super();
-+ while (cur_klass != NULL) {
-+ if (!new_class->is_subclass_of(cur_klass->klass_part()->newest_version())) {
-+ RC_TRACE(0x00000002, ("Removed super class %s",
-+ cur_klass->klass_part()->name()->as_C_string()));
-+ result = result | Klass::RemoveSuperType | Klass::ModifyInstances | Klass::ModifyClass;
-
--
--// Find new bootstrap specifier index value for old bootstrap specifier index
--// value by seaching the index map. Returns zero (-1) if there is no mapped
--// value for the old bootstrap specifier index.
--int VM_RedefineClasses::find_new_operand_index(int old_index) {
-- if (_operands_index_map_count == 0) {
-- // map is empty so nothing can be found
-- return -1;
-- }
--
-- if (old_index == -1 || old_index >= _operands_index_map_p->length()) {
-- // The old_index is out of range so it is not mapped.
-- // This should not happen in regular constant pool merging use.
-- return -1;
-- }
--
-- int value = _operands_index_map_p->at(old_index);
--
-- return value;
--} // end find_new_operand_index()
--
--
--// Returns true if the current mismatch is due to a resolved/unresolved
--// class pair. Otherwise, returns false.
--bool VM_RedefineClasses::is_unresolved_class_mismatch(constantPoolHandle cp1,
-- int index1, constantPoolHandle cp2, int index2) {
--
-- jbyte t1 = cp1->tag_at(index1).value();
-- if (t1 != JVM_CONSTANT_Class && t1 != JVM_CONSTANT_UnresolvedClass) {
-- return false; // wrong entry type; not our special case
-- }
--
-- jbyte t2 = cp2->tag_at(index2).value();
-- if (t2 != JVM_CONSTANT_Class && t2 != JVM_CONSTANT_UnresolvedClass) {
-- return false; // wrong entry type; not our special case
-- }
--
-- if (t1 == t2) {
-- return false; // not a mismatch; not our special case
-- }
--
-- char *s1 = cp1->klass_name_at(index1)->as_C_string();
-- char *s2 = cp2->klass_name_at(index2)->as_C_string();
-- if (strcmp(s1, s2) != 0) {
-- return false; // strings don't match; not our special case
-- }
--
-- return true; // made it through the gauntlet; this is our special case
--} // end is_unresolved_class_mismatch()
--
--
--// Returns true if the current mismatch is due to a resolved/unresolved
--// string pair. Otherwise, returns false.
--bool VM_RedefineClasses::is_unresolved_string_mismatch(constantPoolHandle cp1,
-- int index1, constantPoolHandle cp2, int index2) {
--
-- jbyte t1 = cp1->tag_at(index1).value();
-- if (t1 != JVM_CONSTANT_String && t1 != JVM_CONSTANT_UnresolvedString) {
-- return false; // wrong entry type; not our special case
-- }
--
-- jbyte t2 = cp2->tag_at(index2).value();
-- if (t2 != JVM_CONSTANT_String && t2 != JVM_CONSTANT_UnresolvedString) {
-- return false; // wrong entry type; not our special case
-- }
--
-- if (t1 == t2) {
-- return false; // not a mismatch; not our special case
-- }
--
-- char *s1 = cp1->string_at_noresolve(index1);
-- char *s2 = cp2->string_at_noresolve(index2);
-- if (strcmp(s1, s2) != 0) {
-- return false; // strings don't match; not our special case
-- }
--
-- return true; // made it through the gauntlet; this is our special case
--} // end is_unresolved_string_mismatch()
--
--
--jvmtiError VM_RedefineClasses::load_new_class_versions(TRAPS) {
-- // For consistency allocate memory using os::malloc wrapper.
-- _scratch_classes = (instanceKlassHandle *)
-- os::malloc(sizeof(instanceKlassHandle) * _class_count, mtInternal);
-- if (_scratch_classes == NULL) {
-- return JVMTI_ERROR_OUT_OF_MEMORY;
-- }
--
-- ResourceMark rm(THREAD);
--
-- JvmtiThreadState *state = JvmtiThreadState::state_for(JavaThread::current());
-- // state can only be NULL if the current thread is exiting which
-- // should not happen since we're trying to do a RedefineClasses
-- guarantee(state != NULL, "exiting thread calling load_new_class_versions");
-- for (int i = 0; i < _class_count; i++) {
-- oop mirror = JNIHandles::resolve_non_null(_class_defs[i].klass);
-- // classes for primitives cannot be redefined
-- if (!is_modifiable_class(mirror)) {
-- return JVMTI_ERROR_UNMODIFIABLE_CLASS;
-- }
-- klassOop the_class_oop = java_lang_Class::as_klassOop(mirror);
-- instanceKlassHandle the_class = instanceKlassHandle(THREAD, the_class_oop);
-- Symbol* the_class_sym = the_class->name();
--
-- // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark
-- RC_TRACE_WITH_THREAD(0x00000001, THREAD,
-- ("loading name=%s kind=%d (avail_mem=" UINT64_FORMAT "K)",
-- the_class->external_name(), _class_load_kind,
-- os::available_memory() >> 10));
--
-- ClassFileStream st((u1*) _class_defs[i].class_bytes,
-- _class_defs[i].class_byte_count, (char *)"__VM_RedefineClasses__");
--
-- // Parse the stream.
-- Handle the_class_loader(THREAD, the_class->class_loader());
-- Handle protection_domain(THREAD, the_class->protection_domain());
-- // Set redefined class handle in JvmtiThreadState class.
-- // This redefined class is sent to agent event handler for class file
-- // load hook event.
-- state->set_class_being_redefined(&the_class, _class_load_kind);
--
-- klassOop k = SystemDictionary::parse_stream(the_class_sym,
-- the_class_loader,
-- protection_domain,
-- &st,
-- THREAD);
-- // Clear class_being_redefined just to be sure.
-- state->clear_class_being_redefined();
--
-- // TODO: if this is retransform, and nothing changed we can skip it
--
-- instanceKlassHandle scratch_class (THREAD, k);
--
-- if (HAS_PENDING_EXCEPTION) {
-- Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
-- // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark
-- RC_TRACE_WITH_THREAD(0x00000002, THREAD, ("parse_stream exception: '%s'",
-- ex_name->as_C_string()));
-- CLEAR_PENDING_EXCEPTION;
--
-- if (ex_name == vmSymbols::java_lang_UnsupportedClassVersionError()) {
-- return JVMTI_ERROR_UNSUPPORTED_VERSION;
-- } else if (ex_name == vmSymbols::java_lang_ClassFormatError()) {
-- return JVMTI_ERROR_INVALID_CLASS_FORMAT;
-- } else if (ex_name == vmSymbols::java_lang_ClassCircularityError()) {
-- return JVMTI_ERROR_CIRCULAR_CLASS_DEFINITION;
-- } else if (ex_name == vmSymbols::java_lang_NoClassDefFoundError()) {
-- // The message will be "XXX (wrong name: YYY)"
-- return JVMTI_ERROR_NAMES_DONT_MATCH;
-- } else if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) {
-- return JVMTI_ERROR_OUT_OF_MEMORY;
-- } else { // Just in case more exceptions can be thrown..
-- return JVMTI_ERROR_FAILS_VERIFICATION;
-- }
-- }
--
-- // Ensure class is linked before redefine
-- if (!the_class->is_linked()) {
-- the_class->link_class(THREAD);
-- if (HAS_PENDING_EXCEPTION) {
-- Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
-- // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark
-- RC_TRACE_WITH_THREAD(0x00000002, THREAD, ("link_class exception: '%s'",
-- ex_name->as_C_string()));
-- CLEAR_PENDING_EXCEPTION;
-- if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) {
-- return JVMTI_ERROR_OUT_OF_MEMORY;
-- } else {
-- return JVMTI_ERROR_INTERNAL;
-+ if (!cur_klass->klass_part()->has_subtype_changed()) {
-+ RC_TRACE(0x00000002, ("Subtype changed of class %s",
-+ cur_klass->klass_part()->name()->as_C_string()));
-+ cur_klass->klass_part()->set_subtype_changed(true);
- }
- }
-+
-+ cur_klass = cur_klass->klass_part()->super();
- }
-
-- // Do the validity checks in compare_and_normalize_class_versions()
-- // before verifying the byte codes. By doing these checks first, we
-- // limit the number of functions that require redirection from
-- // the_class to scratch_class. In particular, we don't have to
-- // modify JNI GetSuperclass() and thus won't change its performance.
-- jvmtiError res = compare_and_normalize_class_versions(the_class,
-- scratch_class);
-- if (res != JVMTI_ERROR_NONE) {
-- return res;
-- }
--
-- // verify what the caller passed us
-- {
-- // The bug 6214132 caused the verification to fail.
-- // Information about the_class and scratch_class is temporarily
-- // recorded into jvmtiThreadState. This data is used to redirect
-- // the_class to scratch_class in the JVM_* functions called by the
-- // verifier. Please, refer to jvmtiThreadState.hpp for the detailed
-- // description.
-- RedefineVerifyMark rvm(&the_class, &scratch_class, state);
-- Verifier::verify(
-- scratch_class, Verifier::ThrowException, true, THREAD);
-- }
--
-- if (HAS_PENDING_EXCEPTION) {
-- Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
-- // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark
-- RC_TRACE_WITH_THREAD(0x00000002, THREAD,
-- ("verify_byte_codes exception: '%s'", ex_name->as_C_string()));
-- CLEAR_PENDING_EXCEPTION;
-- if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) {
-- return JVMTI_ERROR_OUT_OF_MEMORY;
-- } else {
-- // tell the caller the bytecodes are bad
-- return JVMTI_ERROR_FAILS_VERIFICATION;
-+ cur_klass = new_class->super();
-+ while (cur_klass != NULL) {
-+ if (!the_class->is_subclass_of(cur_klass->klass_part()->old_version())) {
-+ RC_TRACE(0x00000002, ("Added super class %s",
-+ cur_klass->klass_part()->name()->as_C_string()));
-+ result = result | Klass::ModifyClass | Klass::ModifyInstances;
- }
-- }
--
-- res = merge_cp_and_rewrite(the_class, scratch_class, THREAD);
-- if (res != JVMTI_ERROR_NONE) {
-- return res;
-- }
--
-- if (VerifyMergedCPBytecodes) {
-- // verify what we have done during constant pool merging
-- {
-- RedefineVerifyMark rvm(&the_class, &scratch_class, state);
-- Verifier::verify(scratch_class, Verifier::ThrowException, true, THREAD);
-- }
--
-- if (HAS_PENDING_EXCEPTION) {
-- Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
-- // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark
-- RC_TRACE_WITH_THREAD(0x00000002, THREAD,
-- ("verify_byte_codes post merge-CP exception: '%s'",
-- ex_name->as_C_string()));
-- CLEAR_PENDING_EXCEPTION;
-- if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) {
-- return JVMTI_ERROR_OUT_OF_MEMORY;
-- } else {
-- // tell the caller that constant pool merging screwed up
-- return JVMTI_ERROR_INTERNAL;
-- }
-- }
-- }
--
-- Rewriter::rewrite(scratch_class, THREAD);
-- if (!HAS_PENDING_EXCEPTION) {
-- Rewriter::relocate_and_link(scratch_class, THREAD);
-- }
-- if (HAS_PENDING_EXCEPTION) {
-- Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
-- CLEAR_PENDING_EXCEPTION;
-- if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) {
-- return JVMTI_ERROR_OUT_OF_MEMORY;
-- } else {
-- return JVMTI_ERROR_INTERNAL;
-- }
-- }
--
-- _scratch_classes[i] = scratch_class;
--
-- // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark
-- RC_TRACE_WITH_THREAD(0x00000001, THREAD,
-- ("loaded name=%s (avail_mem=" UINT64_FORMAT "K)",
-- the_class->external_name(), os::available_memory() >> 10));
-- }
--
-- return JVMTI_ERROR_NONE;
--}
--
--
--// Map old_index to new_index as needed. scratch_cp is only needed
--// for RC_TRACE() calls.
--void VM_RedefineClasses::map_index(constantPoolHandle scratch_cp,
-- int old_index, int new_index) {
-- if (find_new_index(old_index) != 0) {
-- // old_index is already mapped
-- return;
-- }
--
-- if (old_index == new_index) {
-- // no mapping is needed
-- return;
-- }
--
-- _index_map_p->at_put(old_index, new_index);
-- _index_map_count++;
--
-- RC_TRACE(0x00040000, ("mapped tag %d at index %d to %d",
-- scratch_cp->tag_at(old_index).value(), old_index, new_index));
--} // end map_index()
--
--
--// Map old_index to new_index as needed.
--void VM_RedefineClasses::map_operand_index(int old_index, int new_index) {
-- if (find_new_operand_index(old_index) != -1) {
-- // old_index is already mapped
-- return;
-- }
--
-- if (old_index == new_index) {
-- // no mapping is needed
-- return;
-- }
--
-- _operands_index_map_p->at_put(old_index, new_index);
-- _operands_index_map_count++;
--
-- RC_TRACE(0x00040000, ("mapped bootstrap specifier at index %d to %d", old_index, new_index));
--} // end map_index()
--
--
--// Merge old_cp and scratch_cp and return the results of the merge via
--// merge_cp_p. The number of entries in *merge_cp_p is returned via
--// merge_cp_length_p. The entries in old_cp occupy the same locations
--// in *merge_cp_p. Also creates a map of indices from entries in
--// scratch_cp to the corresponding entry in *merge_cp_p. Index map
--// entries are only created for entries in scratch_cp that occupy a
--// different location in *merged_cp_p.
--bool VM_RedefineClasses::merge_constant_pools(constantPoolHandle old_cp,
-- constantPoolHandle scratch_cp, constantPoolHandle *merge_cp_p,
-- int *merge_cp_length_p, TRAPS) {
--
-- if (merge_cp_p == NULL) {
-- assert(false, "caller must provide scatch constantPool");
-- return false; // robustness
-- }
-- if (merge_cp_length_p == NULL) {
-- assert(false, "caller must provide scatch CP length");
-- return false; // robustness
-- }
-- // Worst case we need old_cp->length() + scratch_cp()->length(),
-- // but the caller might be smart so make sure we have at least
-- // the minimum.
-- if ((*merge_cp_p)->length() < old_cp->length()) {
-- assert(false, "merge area too small");
-- return false; // robustness
-- }
--
-- RC_TRACE_WITH_THREAD(0x00010000, THREAD,
-- ("old_cp_len=%d, scratch_cp_len=%d", old_cp->length(),
-- scratch_cp->length()));
--
-- {
-- // Pass 0:
-- // The old_cp is copied to *merge_cp_p; this means that any code
-- // using old_cp does not have to change. This work looks like a
-- // perfect fit for constantPoolOop::copy_cp_to(), but we need to
-- // handle one special case:
-- // - revert JVM_CONSTANT_Class to JVM_CONSTANT_UnresolvedClass
-- // This will make verification happy.
--
-- int old_i; // index into old_cp
--
-- // index zero (0) is not used in constantPools
-- for (old_i = 1; old_i < old_cp->length(); old_i++) {
-- // leave debugging crumb
-- jbyte old_tag = old_cp->tag_at(old_i).value();
-- switch (old_tag) {
-- case JVM_CONSTANT_Class:
-- case JVM_CONSTANT_UnresolvedClass:
-- // revert the copy to JVM_CONSTANT_UnresolvedClass
-- // May be resolving while calling this so do the same for
-- // JVM_CONSTANT_UnresolvedClass (klass_name_at() deals with transition)
-- (*merge_cp_p)->unresolved_klass_at_put(old_i,
-- old_cp->klass_name_at(old_i));
-- break;
--
-- case JVM_CONSTANT_Double:
-- case JVM_CONSTANT_Long:
-- // just copy the entry to *merge_cp_p, but double and long take
-- // two constant pool entries
-- constantPoolOopDesc::copy_entry_to(old_cp, old_i, *merge_cp_p, old_i, CHECK_0);
-- old_i++;
-- break;
--
-- default:
-- // just copy the entry to *merge_cp_p
-- constantPoolOopDesc::copy_entry_to(old_cp, old_i, *merge_cp_p, old_i, CHECK_0);
-- break;
-- }
-- } // end for each old_cp entry
--
-- constantPoolOopDesc::copy_operands(old_cp, *merge_cp_p, CHECK_0);
-- (*merge_cp_p)->extend_operands(scratch_cp, CHECK_0);
--
-- // We don't need to sanity check that *merge_cp_length_p is within
-- // *merge_cp_p bounds since we have the minimum on-entry check above.
-- (*merge_cp_length_p) = old_i;
-- }
--
-- // merge_cp_len should be the same as old_cp->length() at this point
-- // so this trace message is really a "warm-and-breathing" message.
-- RC_TRACE_WITH_THREAD(0x00020000, THREAD,
-- ("after pass 0: merge_cp_len=%d", *merge_cp_length_p));
--
-- int scratch_i; // index into scratch_cp
-- {
-- // Pass 1a:
-- // Compare scratch_cp entries to the old_cp entries that we have
-- // already copied to *merge_cp_p. In this pass, we are eliminating
-- // exact duplicates (matching entry at same index) so we only
-- // compare entries in the common indice range.
-- int increment = 1;
-- int pass1a_length = MIN2(old_cp->length(), scratch_cp->length());
-- for (scratch_i = 1; scratch_i < pass1a_length; scratch_i += increment) {
-- switch (scratch_cp->tag_at(scratch_i).value()) {
-- case JVM_CONSTANT_Double:
-- case JVM_CONSTANT_Long:
-- // double and long take two constant pool entries
-- increment = 2;
-- break;
--
-- default:
-- increment = 1;
-- break;
-- }
--
-- bool match = scratch_cp->compare_entry_to(scratch_i, *merge_cp_p,
-- scratch_i, CHECK_0);
-- if (match) {
-- // found a match at the same index so nothing more to do
-- continue;
-- } else if (is_unresolved_class_mismatch(scratch_cp, scratch_i,
-- *merge_cp_p, scratch_i)) {
-- // The mismatch in compare_entry_to() above is because of a
-- // resolved versus unresolved class entry at the same index
-- // with the same string value. Since Pass 0 reverted any
-- // class entries to unresolved class entries in *merge_cp_p,
-- // we go with the unresolved class entry.
-- continue;
-- } else if (is_unresolved_string_mismatch(scratch_cp, scratch_i,
-- *merge_cp_p, scratch_i)) {
-- // The mismatch in compare_entry_to() above is because of a
-- // resolved versus unresolved string entry at the same index
-- // with the same string value. We can live with whichever
-- // happens to be at scratch_i in *merge_cp_p.
-- continue;
-- }
--
-- int found_i = scratch_cp->find_matching_entry(scratch_i, *merge_cp_p,
-- CHECK_0);
-- if (found_i != 0) {
-- guarantee(found_i != scratch_i,
-- "compare_entry_to() and find_matching_entry() do not agree");
--
-- // Found a matching entry somewhere else in *merge_cp_p so
-- // just need a mapping entry.
-- map_index(scratch_cp, scratch_i, found_i);
-- continue;
-- }
--
-- // The find_matching_entry() call above could fail to find a match
-- // due to a resolved versus unresolved class or string entry situation
-- // like we solved above with the is_unresolved_*_mismatch() calls.
-- // However, we would have to call is_unresolved_*_mismatch() over
-- // all of *merge_cp_p (potentially) and that doesn't seem to be
-- // worth the time.
--
-- // No match found so we have to append this entry and any unique
-- // referenced entries to *merge_cp_p.
-- append_entry(scratch_cp, scratch_i, merge_cp_p, merge_cp_length_p,
-- CHECK_0);
-+ cur_klass = cur_klass->klass_part()->super();
- }
- }
-
-- RC_TRACE_WITH_THREAD(0x00020000, THREAD,
-- ("after pass 1a: merge_cp_len=%d, scratch_i=%d, index_map_len=%d",
-- *merge_cp_length_p, scratch_i, _index_map_count));
-+ //////////////////////////////////////////////////////////////////////////////////////////////////////////
-+ // Check interfaces
-
-- if (scratch_i < scratch_cp->length()) {
-- // Pass 1b:
-- // old_cp is smaller than scratch_cp so there are entries in
-- // scratch_cp that we have not yet processed. We take care of
-- // those now.
-- int increment = 1;
-- for (; scratch_i < scratch_cp->length(); scratch_i += increment) {
-- switch (scratch_cp->tag_at(scratch_i).value()) {
-- case JVM_CONSTANT_Double:
-- case JVM_CONSTANT_Long:
-- // double and long take two constant pool entries
-- increment = 2;
-- break;
--
-- default:
-- increment = 1;
-- break;
-+ // Interfaces removed?
-+ objArrayOop old_interfaces = the_class->transitive_interfaces();
-+ for (i = 0; i<old_interfaces->length(); i++) {
-+ instanceKlassHandle old_interface((klassOop)old_interfaces->obj_at(i));
-+ if (!new_class->implements_interface_any_version(old_interface())) {
-+ result = result | Klass::RemoveSuperType | Klass::ModifyClass;
-+ RC_TRACE(0x00000002, ("Removed interface %s",
-+ old_interface->name()->as_C_string()));
-+
-+ if (!old_interface->has_subtype_changed()) {
-+ RC_TRACE(0x00000002, ("Subtype changed of interface %s",
-+ old_interface->name()->as_C_string()));
-+ old_interface->set_subtype_changed(true);
- }
--
-- int found_i =
-- scratch_cp->find_matching_entry(scratch_i, *merge_cp_p, CHECK_0);
-- if (found_i != 0) {
-- // Found a matching entry somewhere else in *merge_cp_p so
-- // just need a mapping entry.
-- map_index(scratch_cp, scratch_i, found_i);
-- continue;
-- }
--
-- // No match found so we have to append this entry and any unique
-- // referenced entries to *merge_cp_p.
-- append_entry(scratch_cp, scratch_i, merge_cp_p, merge_cp_length_p,
-- CHECK_0);
- }
--
-- RC_TRACE_WITH_THREAD(0x00020000, THREAD,
-- ("after pass 1b: merge_cp_len=%d, scratch_i=%d, index_map_len=%d",
-- *merge_cp_length_p, scratch_i, _index_map_count));
-- }
-- finalize_operands_merge(*merge_cp_p, THREAD);
--
-- return true;
--} // end merge_constant_pools()
--
--
--// Merge constant pools between the_class and scratch_class and
--// potentially rewrite bytecodes in scratch_class to use the merged
--// constant pool.
--jvmtiError VM_RedefineClasses::merge_cp_and_rewrite(
-- instanceKlassHandle the_class, instanceKlassHandle scratch_class,
-- TRAPS) {
-- // worst case merged constant pool length is old and new combined
-- int merge_cp_length = the_class->constants()->length()
-- + scratch_class->constants()->length();
--
-- constantPoolHandle old_cp(THREAD, the_class->constants());
-- constantPoolHandle scratch_cp(THREAD, scratch_class->constants());
--
-- // Constant pools are not easily reused so we allocate a new one
-- // each time.
-- // merge_cp is created unsafe for concurrent GC processing. It
-- // should be marked safe before discarding it. Even though
-- // garbage, if it crosses a card boundary, it may be scanned
-- // in order to find the start of the first complete object on the card.
-- constantPoolHandle merge_cp(THREAD,
-- oopFactory::new_constantPool(merge_cp_length,
-- oopDesc::IsUnsafeConc,
-- THREAD));
-- int orig_length = old_cp->orig_length();
-- if (orig_length == 0) {
-- // This old_cp is an actual original constant pool. We save
-- // the original length in the merged constant pool so that
-- // merge_constant_pools() can be more efficient. If a constant
-- // pool has a non-zero orig_length() value, then that constant
-- // pool was created by a merge operation in RedefineClasses.
-- merge_cp->set_orig_length(old_cp->length());
-- } else {
-- // This old_cp is a merged constant pool from a previous
-- // RedefineClasses() calls so just copy the orig_length()
-- // value.
-- merge_cp->set_orig_length(old_cp->orig_length());
- }
-
-- ResourceMark rm(THREAD);
-- _index_map_count = 0;
-- _index_map_p = new intArray(scratch_cp->length(), -1);
--
-- _operands_cur_length = constantPoolOopDesc::operand_array_length(old_cp->operands());
-- _operands_index_map_count = 0;
-- _operands_index_map_p = new intArray(
-- constantPoolOopDesc::operand_array_length(scratch_cp->operands()), -1);
--
-- // reference to the cp holder is needed for copy_operands()
-- merge_cp->set_pool_holder(scratch_class());
-- bool result = merge_constant_pools(old_cp, scratch_cp, &merge_cp,
-- &merge_cp_length, THREAD);
-- merge_cp->set_pool_holder(NULL);
--
-- if (!result) {
-- // The merge can fail due to memory allocation failure or due
-- // to robustness checks.
-- return JVMTI_ERROR_INTERNAL;
-+ // Interfaces added?
-+ objArrayOop new_interfaces = new_class->transitive_interfaces();
-+ for (i = 0; i<new_interfaces->length(); i++) {
-+ if (!the_class->implements_interface_any_version((klassOop)new_interfaces->obj_at(i))) {
-+ result = result | Klass::ModifyClass;
-+ RC_TRACE(0x00000002, ("Added interface %s",
-+ ((klassOop)new_interfaces->obj_at(i))->klass_part()->name()->as_C_string()));
-+ }
- }
-
-- RC_TRACE_WITH_THREAD(0x00010000, THREAD,
-- ("merge_cp_len=%d, index_map_len=%d", merge_cp_length, _index_map_count));
-
-- if (_index_map_count == 0) {
-- // there is nothing to map between the new and merged constant pools
-+ // Check whether class modifiers are the same.
-+ jushort old_flags = (jushort) the_class->access_flags().get_flags();
-+ jushort new_flags = (jushort) new_class->access_flags().get_flags();
-+ if (old_flags != new_flags) {
-+ // TODO (tw): Can this have any effects?
-+ }
-
-- if (old_cp->length() == scratch_cp->length()) {
-- // The old and new constant pools are the same length and the
-- // index map is empty. This means that the three constant pools
-- // are equivalent (but not the same). Unfortunately, the new
-- // constant pool has not gone through link resolution nor have
-- // the new class bytecodes gone through constant pool cache
-- // rewriting so we can't use the old constant pool with the new
-- // class.
-+ // Check if the number, names, types and order of fields declared in these classes
-+ // are the same.
-+ JavaFieldStream old_fs(the_class);
-+ JavaFieldStream new_fs(new_class);
-+ for (; !old_fs.done() && !new_fs.done(); old_fs.next(), new_fs.next()) {
-+ // access
-+ old_flags = old_fs.access_flags().as_short();
-+ new_flags = new_fs.access_flags().as_short();
-+ if ((old_flags ^ new_flags) & JVM_RECOGNIZED_FIELD_MODIFIERS) {
-+ // (tw) Can this have any effects?
-+ }
-+ // offset
-+ if (old_fs.offset() != new_fs.offset()) {
-+ result = result | Klass::ModifyInstances;
-+ }
-+ // name and signature
-+ Symbol* name_sym1 = the_class->constants()->symbol_at(old_fs.name_index());
-+ Symbol* sig_sym1 = the_class->constants()->symbol_at(old_fs.signature_index());
-+ Symbol* name_sym2 = new_class->constants()->symbol_at(new_fs.name_index());
-+ Symbol* sig_sym2 = new_class->constants()->symbol_at(new_fs.signature_index());
-+ if (name_sym1 != name_sym2 || sig_sym1 != sig_sym2) {
-+ result = result | Klass::ModifyInstances;
-+ }
-+ }
-
-- merge_cp()->set_is_conc_safe(true);
-- merge_cp = constantPoolHandle(); // toss the merged constant pool
-- } else if (old_cp->length() < scratch_cp->length()) {
-- // The old constant pool has fewer entries than the new constant
-- // pool and the index map is empty. This means the new constant
-- // pool is a superset of the old constant pool. However, the old
-- // class bytecodes have already gone through constant pool cache
-- // rewriting so we can't use the new constant pool with the old
-- // class.
-+ if (!old_fs.done() || !new_fs.done()) {
-+ result = result | Klass::ModifyInstances;
-+ }
-
-- merge_cp()->set_is_conc_safe(true);
-- merge_cp = constantPoolHandle(); // toss the merged constant pool
-+ // Do a parallel walk through the old and new methods. Detect
-+ // cases where they match (exist in both), have been added in
-+ // the new methods, or have been deleted (exist only in the
-+ // old methods). The class file parser places methods in order
-+ // by method name, but does not order overloaded methods by
-+ // signature. In order to determine what fate befell the methods,
-+ // this code places the overloaded new methods that have matching
-+ // old methods in the same order as the old methods and places
-+ // new overloaded methods at the end of overloaded methods of
-+ // that name. The code for this order normalization is adapted
-+ // from the algorithm used in instanceKlass::find_method().
-+ // Since we are swapping out of order entries as we find them,
-+ // we only have to search forward through the overloaded methods.
-+ // Methods which are added and have the same name as an existing
-+ // method (but different signature) will be put at the end of
-+ // the methods with that name, and the name mismatch code will
-+ // handle them.
-+ objArrayHandle k_old_methods(the_class->methods());
-+ objArrayHandle k_new_methods(new_class->methods());
-+ int n_old_methods = k_old_methods->length();
-+ int n_new_methods = k_new_methods->length();
-+
-+ int ni = 0;
-+ int oi = 0;
-+ while (true) {
-+ methodOop k_old_method;
-+ methodOop k_new_method;
-+ enum { matched, added, deleted, undetermined } method_was = undetermined;
-+
-+ if (oi >= n_old_methods) {
-+ if (ni >= n_new_methods) {
-+ break; // we've looked at everything, done
-+ }
-+ // New method at the end
-+ k_new_method = (methodOop) k_new_methods->obj_at(ni);
-+ method_was = added;
-+ } else if (ni >= n_new_methods) {
-+ // Old method, at the end, is deleted
-+ k_old_method = (methodOop) k_old_methods->obj_at(oi);
-+ method_was = deleted;
- } else {
-- // The old constant pool has more entries than the new constant
-- // pool and the index map is empty. This means that both the old
-- // and merged constant pools are supersets of the new constant
-- // pool.
-+ // There are more methods in both the old and new lists
-+ k_old_method = (methodOop) k_old_methods->obj_at(oi);
-+ k_new_method = (methodOop) k_new_methods->obj_at(ni);
-+ if (k_old_method->name() != k_new_method->name()) {
-+ // Methods are sorted by method name, so a mismatch means added
-+ // or deleted
-+ if (k_old_method->name()->fast_compare(k_new_method->name()) > 0) {
-+ method_was = added;
-+ } else {
-+ method_was = deleted;
-+ }
-+ } else if (k_old_method->signature() == k_new_method->signature()) {
-+ // Both the name and signature match
-+ method_was = matched;
-+ } else {
-+ // The name matches, but the signature doesn't, which means we have to
-+ // search forward through the new overloaded methods.
-+ int nj; // outside the loop for post-loop check
-+ for (nj = ni + 1; nj < n_new_methods; nj++) {
-+ methodOop m = (methodOop)k_new_methods->obj_at(nj);
-+ if (k_old_method->name() != m->name()) {
-+ // reached another method name so no more overloaded methods
-+ method_was = deleted;
-+ break;
-+ }
-+ if (k_old_method->signature() == m->signature()) {
-+ // found a match so swap the methods
-+ k_new_methods->obj_at_put(ni, m);
-+ k_new_methods->obj_at_put(nj, k_new_method);
-+ k_new_method = m;
-+ method_was = matched;
-+ break;
-+ }
-+ }
-
-- // Replace the new constant pool with a shrunken copy of the
-- // merged constant pool; the previous new constant pool will
-- // get GCed.
-- set_new_constant_pool(scratch_class, merge_cp, merge_cp_length,
-- THREAD);
-- // drop local ref to the merged constant pool
-- merge_cp()->set_is_conc_safe(true);
-- merge_cp = constantPoolHandle();
-- }
-- } else {
-- if (RC_TRACE_ENABLED(0x00040000)) {
-- // don't want to loop unless we are tracing
-- int count = 0;
-- for (int i = 1; i < _index_map_p->length(); i++) {
-- int value = _index_map_p->at(i);
--
-- if (value != -1) {
-- RC_TRACE_WITH_THREAD(0x00040000, THREAD,
-- ("index_map[%d]: old=%d new=%d", count, i, value));
-- count++;
-+ if (nj >= n_new_methods) {
-+ // reached the end without a match; so method was deleted
-+ method_was = deleted;
- }
- }
- }
-
-- // We have entries mapped between the new and merged constant pools
-- // so we have to rewrite some constant pool references.
-- if (!rewrite_cp_refs(scratch_class, THREAD)) {
-- return JVMTI_ERROR_INTERNAL;
-+ switch (method_was) {
-+ case matched:
-+ // methods match, be sure modifiers do too
-+ old_flags = (jushort) k_old_method->access_flags().get_flags();
-+ new_flags = (jushort) k_new_method->access_flags().get_flags();
-+ if ((old_flags ^ new_flags) & ~(JVM_ACC_NATIVE)) {
-+ // (tw) Can this have any effects? Probably yes on vtables?
-+ result = result | Klass::ModifyClass;
- }
--
-- // Replace the new constant pool with a shrunken copy of the
-- // merged constant pool so now the rewritten bytecodes have
-- // valid references; the previous new constant pool will get
-- // GCed.
-- set_new_constant_pool(scratch_class, merge_cp, merge_cp_length,
-- THREAD);
-- merge_cp()->set_is_conc_safe(true);
-- }
-- assert(old_cp()->is_conc_safe(), "Just checking");
-- assert(scratch_cp()->is_conc_safe(), "Just checking");
--
-- return JVMTI_ERROR_NONE;
--} // end merge_cp_and_rewrite()
--
--
--// Rewrite constant pool references in klass scratch_class.
--bool VM_RedefineClasses::rewrite_cp_refs(instanceKlassHandle scratch_class,
-- TRAPS) {
--
-- // rewrite constant pool references in the methods:
-- if (!rewrite_cp_refs_in_methods(scratch_class, THREAD)) {
-- // propagate failure back to caller
-- return false;
-- }
--
-- // rewrite constant pool references in the class_annotations:
-- if (!rewrite_cp_refs_in_class_annotations(scratch_class, THREAD)) {
-- // propagate failure back to caller
-- return false;
-- }
--
-- // rewrite constant pool references in the fields_annotations:
-- if (!rewrite_cp_refs_in_fields_annotations(scratch_class, THREAD)) {
-- // propagate failure back to caller
-- return false;
-- }
--
-- // rewrite constant pool references in the methods_annotations:
-- if (!rewrite_cp_refs_in_methods_annotations(scratch_class, THREAD)) {
-- // propagate failure back to caller
-- return false;
-- }
--
-- // rewrite constant pool references in the methods_parameter_annotations:
-- if (!rewrite_cp_refs_in_methods_parameter_annotations(scratch_class,
-- THREAD)) {
-- // propagate failure back to caller
-- return false;
-- }
--
-- // rewrite constant pool references in the methods_default_annotations:
-- if (!rewrite_cp_refs_in_methods_default_annotations(scratch_class,
-- THREAD)) {
-- // propagate failure back to caller
-- return false;
-- }
--
-- return true;
--} // end rewrite_cp_refs()
--
--
--// Rewrite constant pool references in the methods.
--bool VM_RedefineClasses::rewrite_cp_refs_in_methods(
-- instanceKlassHandle scratch_class, TRAPS) {
--
-- objArrayHandle methods(THREAD, scratch_class->methods());
--
-- if (methods.is_null() || methods->length() == 0) {
-- // no methods so nothing to do
-- return true;
-- }
--
-- // rewrite constant pool references in the methods:
-- for (int i = methods->length() - 1; i >= 0; i--) {
-- methodHandle method(THREAD, (methodOop)methods->obj_at(i));
-- methodHandle new_method;
-- rewrite_cp_refs_in_method(method, &new_method, CHECK_false);
-- if (!new_method.is_null()) {
-- // the method has been replaced so save the new method version
-- methods->obj_at_put(i, new_method());
-+ {
-+ u2 new_num = k_new_method->method_idnum();
-+ u2 old_num = k_old_method->method_idnum();
-+ if (new_num != old_num) {
-+ methodOop idnum_owner = new_class->method_with_idnum(old_num);
-+ if (idnum_owner != NULL) {
-+ // There is already a method assigned this idnum -- switch them
-+ idnum_owner->set_method_idnum(new_num);
-+ }
-+ k_new_method->set_method_idnum(old_num);
-+ RC_TRACE(0x00000002, ("swapping idnum of new and old method %d / %d!",
-+ new_num,
-+ old_num));
-+ // swap_all_method_annotations(old_num, new_num, new_class);
-+ }
-+ }
-+ RC_TRACE(0x00008000, ("Method matched: new: %s [%d] == old: %s [%d]",
-+ k_new_method->name_and_sig_as_C_string(), ni,
-+ k_old_method->name_and_sig_as_C_string(), oi));
-+ // advance to next pair of methods
-+ ++oi;
-+ ++ni;
-+ break;
-+ case added:
-+ // method added, see if it is OK
-+ new_flags = (jushort) k_new_method->access_flags().get_flags();
-+ if ((new_flags & JVM_ACC_PRIVATE) == 0
-+ // hack: private should be treated as final, but alas
-+ || (new_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0
-+ ) {
-+ // new methods must be private
-+ result = result | Klass::ModifyClass;
-+ }
-+ {
-+ u2 num = the_class->next_method_idnum();
-+ if (num == constMethodOopDesc::UNSET_IDNUM) {
-+ // cannot add any more methods
-+ result = result | Klass::ModifyClass;
-+ }
-+ u2 new_num = k_new_method->method_idnum();
-+ methodOop idnum_owner = new_class->method_with_idnum(num);
-+ if (idnum_owner != NULL) {
-+ // There is already a method assigned this idnum -- switch them
-+ idnum_owner->set_method_idnum(new_num);
-+ }
-+ k_new_method->set_method_idnum(num);
-+ //swap_all_method_annotations(new_num, num, new_class);
-+ }
-+ RC_TRACE(0x00000001, ("Method added: new: %s [%d]",
-+ k_new_method->name_and_sig_as_C_string(), ni));
-+ ++ni; // advance to next new method
-+ break;
-+ case deleted:
-+ // method deleted, see if it is OK
-+ old_flags = (jushort) k_old_method->access_flags().get_flags();
-+ if ((old_flags & JVM_ACC_PRIVATE) == 0
-+ // hack: private should be treated as final, but alas
-+ || (old_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0
-+ ) {
-+ // deleted methods must be private
-+ result = result | Klass::ModifyClass;
-+ }
-+ RC_TRACE(0x00000001, ("Method deleted: old: %s [%d]",
-+ k_old_method->name_and_sig_as_C_string(), oi));
-+ ++oi; // advance to next old method
-+ break;
-+ default:
-+ ShouldNotReachHere();
- }
- }
-
-- return true;
-+ if (new_class()->size() != new_class->old_version()->size()) {
-+ result |= Klass::ModifyClassSize;
-+ }
-+
-+ if (new_class->size_helper() != ((instanceKlass*)(new_class->old_version()->klass_part()))->size_helper()) {
-+ result |= Klass::ModifyInstanceSize;
-+ }
-+
-+ methodHandle instanceTransformerMethod(new_class->find_method(vmSymbols::transformer_name(), vmSymbols::void_method_signature()));
-+ if (!instanceTransformerMethod.is_null() && !instanceTransformerMethod->is_static()) {
-+ result |= Klass::HasInstanceTransformer;
-+ }
-+
-+ // (tw) Check method bodies to be able to return NoChange?
-+ return result;
- }
-
-+void VM_RedefineClasses::calculate_instance_update_information(klassOop new_version) {
-
--// Rewrite constant pool references in the specific method. This code
--// was adapted from Rewriter::rewrite_method().
--void VM_RedefineClasses::rewrite_cp_refs_in_method(methodHandle method,
-- methodHandle *new_method_p, TRAPS) {
-+ class UpdateFieldsEvolutionClosure : public FieldEvolutionClosure {
-
-- *new_method_p = methodHandle(); // default is no new method
-+ private:
-
-- // We cache a pointer to the bytecodes here in code_base. If GC
-- // moves the methodOop, then the bytecodes will also move which
-- // will likely cause a crash. We create a No_Safepoint_Verifier
-- // object to detect whether we pass a possible safepoint in this
-- // code block.
-- No_Safepoint_Verifier nsv;
-+ GrowableArray<int> info;
-+ int curPosition;
-+ bool copy_backwards;
-
-- // Bytecodes and their length
-- address code_base = method->code_base();
-- int code_length = method->code_size();
-+ public:
-
-- int bc_length;
-- for (int bci = 0; bci < code_length; bci += bc_length) {
-- address bcp = code_base + bci;
-- Bytecodes::Code c = (Bytecodes::Code)(*bcp);
--
-- bc_length = Bytecodes::length_for(c);
-- if (bc_length == 0) {
-- // More complicated bytecodes report a length of zero so
-- // we have to try again a slightly different way.
-- bc_length = Bytecodes::length_at(method(), bcp);
-+ bool does_copy_backwards() {
-+ return copy_backwards;
- }
-
-- assert(bc_length != 0, "impossible bytecode length");
-+ UpdateFieldsEvolutionClosure(klassOop klass) {
-
-- switch (c) {
-- case Bytecodes::_ldc:
-- {
-- int cp_index = *(bcp + 1);
-- int new_index = find_new_index(cp_index);
-+ int base_offset = instanceOopDesc::base_offset_in_bytes();
-
-- if (StressLdcRewrite && new_index == 0) {
-- // If we are stressing ldc -> ldc_w rewriting, then we
-- // always need a new_index value.
-- new_index = cp_index;
-- }
-- if (new_index != 0) {
-- // the original index is mapped so we have more work to do
-- if (!StressLdcRewrite && new_index <= max_jubyte) {
-- // The new value can still use ldc instead of ldc_w
-- // unless we are trying to stress ldc -> ldc_w rewriting
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("%s@" INTPTR_FORMAT " old=%d, new=%d", Bytecodes::name(c),
-- bcp, cp_index, new_index));
-- *(bcp + 1) = new_index;
-+ if (klass->klass_part()->newest_version() == SystemDictionary::Reference_klass()->klass_part()->newest_version()) {
-+ base_offset += java_lang_ref_Reference::number_of_fake_oop_fields*size_of_type(T_OBJECT);
-+ }
-+
-+ info.append(base_offset);
-+ info.append(0);
-+ curPosition = base_offset;
-+ copy_backwards = false;
-+ }
-+
-+ GrowableArray<int> &finish() {
-+ info.append(0);
-+ return info;
-+ }
-+
-+ virtual void do_new_field(fieldDescriptor* fd){
-+ int alignment = fd->offset() - curPosition;
-+ if (alignment > 0) {
-+ // This field was aligned, so we need to make sure that we fill the gap
-+ fill(alignment);
-+ }
-+
-+ int size = size_of_type(fd->field_type());
-+ fill(size);
-+ }
-+
-+ private:
-+
-+ void fill(int size) {
-+ if (info.length() > 0 && info.at(info.length() - 1) < 0) {
-+ (*info.adr_at(info.length() - 1)) -= size;
-+ } else {
-+ info.append(-size);
-+ }
-+
-+ curPosition += size;
-+ }
-+
-+ int size_of_type(BasicType type) {
-+ int size = 0;
-+ switch(type) {
-+ case T_BOOLEAN:
-+ size = sizeof(jboolean);
-+ break;
-+
-+ case T_CHAR:
-+ size = (sizeof(jchar));
-+ break;
-+
-+ case T_FLOAT:
-+ size = (sizeof(jfloat));
-+ break;
-+
-+ case T_DOUBLE:
-+ size = (sizeof(jdouble));
-+ break;
-+
-+ case T_BYTE:
-+ size = (sizeof(jbyte));
-+ break;
-+
-+ case T_SHORT:
-+ size = (sizeof(jshort));
-+ break;
-+
-+ case T_INT:
-+ size = (sizeof(jint));
-+ break;
-+
-+ case T_LONG:
-+ size = (sizeof(jlong));
-+ break;
-+
-+ case T_OBJECT:
-+ case T_ARRAY:
-+ if (UseCompressedOops) {
-+ size = sizeof(narrowOop);
- } else {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("%s->ldc_w@" INTPTR_FORMAT " old=%d, new=%d",
-- Bytecodes::name(c), bcp, cp_index, new_index));
-- // the new value needs ldc_w instead of ldc
-- u_char inst_buffer[4]; // max instruction size is 4 bytes
-- bcp = (address)inst_buffer;
-- // construct new instruction sequence
-- *bcp = Bytecodes::_ldc_w;
-- bcp++;
-- // Rewriter::rewrite_method() does not rewrite ldc -> ldc_w.
-- // See comment below for difference between put_Java_u2()
-- // and put_native_u2().
-- Bytes::put_Java_u2(bcp, new_index);
-+ size = (sizeof(oop));
-+ }
-+ break;
-
-- Relocator rc(method, NULL /* no RelocatorListener needed */);
-- methodHandle m;
-- {
-- Pause_No_Safepoint_Verifier pnsv(&nsv);
-+ default:
-+ ShouldNotReachHere();
-+ }
-
-- // ldc is 2 bytes and ldc_w is 3 bytes
-- m = rc.insert_space_at(bci, 3, inst_buffer, THREAD);
-- if (m.is_null() || HAS_PENDING_EXCEPTION) {
-- guarantee(false, "insert_space_at() failed");
-+ assert(size > 0, "");
-+ return size;
-+
-+ }
-+
-+ public:
-+
-+ virtual void do_old_field(fieldDescriptor* fd){}
-+
-+ virtual void do_changed_field(fieldDescriptor* old_fd, fieldDescriptor *new_fd){
-+
-+ int alignment = new_fd->offset() - curPosition;
-+ if (alignment > 0) {
-+ // This field was aligned, so we need to make sure that we fill the gap
-+ fill(alignment);
-+ }
-+
-+ assert(old_fd->field_type() == new_fd->field_type(), "");
-+ assert(curPosition == new_fd->offset(), "must be correct offset!");
-+
-+ int offset = old_fd->offset();
-+ int size = size_of_type(old_fd->field_type());
-+
-+ int prevEnd = -1;
-+ if (info.length() > 0 && info.at(info.length() - 1) > 0) {
-+ prevEnd = info.at(info.length() - 2) + info.at(info.length() - 1);
-+ }
-+
-+ if (prevEnd == offset) {
-+ info.at_put(info.length() - 2, info.at(info.length() - 2) + size);
-+ } else {
-+ info.append(size);
-+ info.append(offset);
-+ }
-+
-+ if (old_fd->offset() < new_fd->offset()) {
-+ copy_backwards = true;
-+ }
-+
-+ transfer_special_access_flags(old_fd, new_fd);
-+
-+ curPosition += size;
-+ }
-+ };
-+
-+ UpdateFieldsEvolutionClosure cl(new_version);
-+ ((instanceKlass*)new_version->klass_part())->do_fields_evolution(&cl);
-+
-+ GrowableArray<int> result = cl.finish();
-+ ((instanceKlass*)new_version->klass_part())->store_update_information(result);
-+ ((instanceKlass*)new_version->klass_part())->set_copying_backwards(cl.does_copy_backwards());
-+
-+ if (RC_TRACE_ENABLED(0x00000002)) {
-+ RC_TRACE(0x00000002, ("Instance update information for %s:",
-+ new_version->klass_part()->name()->as_C_string()));
-+ if (cl.does_copy_backwards()) {
-+ RC_TRACE(0x00000002, ("\tDoes copy backwards!"));
-+ }
-+ for (int i=0; i<result.length(); i++) {
-+ int curNum = result.at(i);
-+ if (curNum < 0) {
-+ RC_TRACE(0x00000002, ("\t%d CLEAN", curNum));
-+ } else if (curNum > 0) {
-+ RC_TRACE(0x00000002, ("\t%d COPY from %d", curNum, result.at(i + 1)));
-+ i++;
-+ } else {
-+ RC_TRACE(0x00000002, ("\tEND"));
-+ }
-+ }
-+ }
-+}
-+
-+Symbol* VM_RedefineClasses::signature_to_class_name(Symbol* signature) {
-+ assert(FieldType::is_obj(signature), "");
-+ return SymbolTable::new_symbol(signature->as_C_string() + 1, signature->utf8_length() - 2, Thread::current());
-+}
-+
-+void VM_RedefineClasses::calculate_type_check_information(klassOop klass) {
-+ if (klass->klass_part()->is_redefining()) {
-+ klass = klass->klass_part()->old_version();
-+ }
-+
-+ // We found an instance klass!
-+ instanceKlass *cur_instance_klass = instanceKlass::cast(klass);
-+ GrowableArray< Pair<int, klassOop> > type_check_information;
-+
-+ class MyFieldClosure : public FieldClosure {
-+
-+ public:
-+
-+ GrowableArray< Pair<int, klassOop> > *_arr;
-+
-+ MyFieldClosure(GrowableArray< Pair<int, klassOop> > *arr) {
-+ _arr = arr;
-+ }
-+
-+ virtual void do_field(fieldDescriptor* fd) {
-+ if (fd->field_type() == T_OBJECT) {
-+ Symbol* signature = fd->signature();
-+ if (FieldType::is_obj(signature)) {
-+ Symbol* name = signature_to_class_name(signature);
-+ klassOop field_klass;
-+ if (is_field_dangerous(name, fd, field_klass)) {
-+ RC_TRACE(0x00000002, ("Found dangerous field %s in klass %s of type %s",
-+ fd->name()->as_C_string(),
-+ fd->field_holder()->klass_part()->name()->as_C_string(),
-+ name->as_C_string()));
-+ _arr->append(Pair<int, klassOop>(fd->offset(), field_klass->klass_part()->newest_version()));
-+ }
-+ }
-+
-+ // Array fields can never be a problem!
-+ }
-+ }
-+
-+ bool is_field_dangerous(Symbol* klass_name, fieldDescriptor *fd, klassOop &field_klass) {
-+ field_klass = SystemDictionary::find(klass_name, fd->field_holder()->klass_part()->class_loader(),
-+ fd->field_holder()->klass_part()->protection_domain(), Thread::current());
-+ if(field_klass != NULL) {
-+ if (field_klass->klass_part()->is_redefining()) {
-+ field_klass = field_klass->klass_part()->old_version();
-+ }
-+ if (field_klass->klass_part()->has_subtype_changed()) {
-+ return true;
-+ }
-+ }
-+ return false;
-+ }
-+ };
-+
-+ MyFieldClosure fieldClosure(&type_check_information);
-+ cur_instance_klass->do_nonstatic_fields(&fieldClosure);
-+
-+ if (type_check_information.length() > 0) {
-+ type_check_information.append(Pair<int, klassOop>(-1, NULL));
-+ cur_instance_klass->store_type_check_information(type_check_information);
-+ }
-+}
-+
-+bool VM_RedefineClasses::check_field_value_types() {
-+
-+ Thread *THREAD = Thread::current();
-+ class CheckFieldTypesClosure : public ObjectClosure {
-+
-+ private:
-+
-+ bool _result;
-+
-+ public:
-+
-+ CheckFieldTypesClosure() {
-+ _result = true;
-+ }
-+
-+ bool result() { return _result; }
-+
-+ virtual void do_object(oop obj) {
-+
-+ if (!_result) {
-+ return;
-+ }
-+
-+ if (obj->is_objArray()) {
-+
-+ objArrayOop array = objArrayOop(obj);
-+
-+ klassOop element_klass = objArrayKlass::cast(array->klass())->element_klass();
-+
-+ if (element_klass->klass_part()->has_subtype_changed()) {
-+ int length = array->length();
-+ for (int i=0; i<length; i++) {
-+ oop element = array->obj_at(i);
-+ if (element != NULL && element->blueprint()->newest_version()->klass_part()->is_redefining()) {
-+ // Check subtype relationship to static type of array
-+ if (!element->blueprint()->newest_version()->klass_part()->is_subtype_of(element_klass->klass_part()->newest_version())) {
-+ RC_TRACE(0x00000001, ("Array value is INVALID - abort redefinition (static_type=%s, index=%d, dynamic_type=%s)",
-+ element_klass->klass_part()->name()->as_C_string(),
-+ i,
-+ element->blueprint()->name()->as_C_string()));
-+ _result = false;
-+ break;
- }
- }
--
-- // return the new method so that the caller can update
-- // the containing class
-- *new_method_p = method = m;
-- // switch our bytecode processing loop from the old method
-- // to the new method
-- code_base = method->code_base();
-- code_length = method->code_size();
-- bcp = code_base + bci;
-- c = (Bytecodes::Code)(*bcp);
-- bc_length = Bytecodes::length_for(c);
-- assert(bc_length != 0, "sanity check");
-- } // end we need ldc_w instead of ldc
-- } // end if there is a mapped index
-- } break;
--
-- // these bytecodes have a two-byte constant pool index
-- case Bytecodes::_anewarray : // fall through
-- case Bytecodes::_checkcast : // fall through
-- case Bytecodes::_getfield : // fall through
-- case Bytecodes::_getstatic : // fall through
-- case Bytecodes::_instanceof : // fall through
-- case Bytecodes::_invokedynamic : // fall through
-- case Bytecodes::_invokeinterface: // fall through
-- case Bytecodes::_invokespecial : // fall through
-- case Bytecodes::_invokestatic : // fall through
-- case Bytecodes::_invokevirtual : // fall through
-- case Bytecodes::_ldc_w : // fall through
-- case Bytecodes::_ldc2_w : // fall through
-- case Bytecodes::_multianewarray : // fall through
-- case Bytecodes::_new : // fall through
-- case Bytecodes::_putfield : // fall through
-- case Bytecodes::_putstatic :
-- {
-- address p = bcp + 1;
-- int cp_index = Bytes::get_Java_u2(p);
-- int new_index = find_new_index(cp_index);
-- if (new_index != 0) {
-- // the original index is mapped so update w/ new value
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("%s@" INTPTR_FORMAT " old=%d, new=%d", Bytecodes::name(c),
-- bcp, cp_index, new_index));
-- // Rewriter::rewrite_method() uses put_native_u2() in this
-- // situation because it is reusing the constant pool index
-- // location for a native index into the constantPoolCache.
-- // Since we are updating the constant pool index prior to
-- // verification and constantPoolCache initialization, we
-- // need to keep the new index in Java byte order.
-- Bytes::put_Java_u2(p, new_index);
-+ }
- }
-- } break;
-+
-+ } else {
-+ Pair<int, klassOop> *cur = obj->klass()->klass_part()->type_check_information();
-+ if (cur != NULL) {
-+ // Type check information exists for this oop
-+ while ((*cur).left() != -1) {
-+ check_field(obj, (*cur).left(), (*cur).right());
-+ cur++;
-+ }
-+ }
-+ }
- }
-- } // end for each bytecode
--} // end rewrite_cp_refs_in_method()
-
-+ void check_field(oop obj, int offset, klassOop static_type) {
-+ oop field_value = obj->obj_field(offset);
-+ if (field_value != NULL) {
-+ // Field is not null
-+ if (field_value->klass()->klass_part()->newest_version()->klass_part()->is_subtype_of(static_type)) {
-+ // We are OK
-+ RC_TRACE(0x00008000, ("Field value is OK (klass=%s, static_type=%s, offset=%d, dynamic_type=%s)",
-+ obj->klass()->klass_part()->name()->as_C_string(),
-+ static_type->klass_part()->name()->as_C_string(),
-+ offset,
-+ field_value->klass()->klass_part()->name()->as_C_string()));
-+ } else {
-+ // Failure!
-+ RC_TRACE(0x00000001, ("Field value is INVALID - abort redefinition (klass=%s, static_type=%s, offset=%d, dynamic_type=%s)",
-+ obj->klass()->klass_part()->name()->as_C_string(),
-+ static_type->klass_part()->name()->as_C_string(),
-+ offset,
-+ field_value->klass()->klass_part()->name()->as_C_string()));
-+ _result = false;
-+ }
-+ }
-+ }
-+ };
-
--// Rewrite constant pool references in the class_annotations field.
--bool VM_RedefineClasses::rewrite_cp_refs_in_class_annotations(
-- instanceKlassHandle scratch_class, TRAPS) {
-+ CheckFieldTypesClosure myObjectClosure;
-
-- typeArrayHandle class_annotations(THREAD,
-- scratch_class->class_annotations());
-- if (class_annotations.is_null() || class_annotations->length() == 0) {
-- // no class_annotations so nothing to do
-- return true;
-+ // make sure that heap is parsable (fills TLABs with filler objects)
-+ Universe::heap()->ensure_parsability(false); // no need to retire TLABs
-+
-+ // do the iteration
-+ // If this operation encounters a bad object when using CMS,
-+ // consider using safe_object_iterate() which avoids perm gen
-+ // objects that may contain bad references.
-+ Universe::heap()->object_iterate(&myObjectClosure);
-+
-+ // when sharing is enabled we must iterate over the shared spaces
-+ if (UseSharedSpaces) {
-+ GenCollectedHeap* gch = GenCollectedHeap::heap();
-+ CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen();
-+ gen->ro_space()->object_iterate(&myObjectClosure);
-+ gen->rw_space()->object_iterate(&myObjectClosure);
- }
-
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("class_annotations length=%d", class_annotations->length()));
--
-- int byte_i = 0; // byte index into class_annotations
-- return rewrite_cp_refs_in_annotations_typeArray(class_annotations, byte_i,
-- THREAD);
-+ return myObjectClosure.result();
- }
-
--
--// Rewrite constant pool references in an annotations typeArray. This
--// "structure" is adapted from the RuntimeVisibleAnnotations_attribute
--// that is described in section 4.8.15 of the 2nd-edition of the VM spec:
--//
--// annotations_typeArray {
--// u2 num_annotations;
--// annotation annotations[num_annotations];
--// }
--//
--bool VM_RedefineClasses::rewrite_cp_refs_in_annotations_typeArray(
-- typeArrayHandle annotations_typeArray, int &byte_i_ref, TRAPS) {
--
-- if ((byte_i_ref + 2) > annotations_typeArray->length()) {
-- // not enough room for num_annotations field
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("length() is too small for num_annotations field"));
-- return false;
-+void VM_RedefineClasses::clear_type_check_information(klassOop k) {
-+ if (k->klass_part()->is_redefining()) {
-+ k = k->klass_part()->old_version();
- }
-
-- u2 num_annotations = Bytes::get_Java_u2((address)
-- annotations_typeArray->byte_at_addr(byte_i_ref));
-- byte_i_ref += 2;
--
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("num_annotations=%d", num_annotations));
--
-- int calc_num_annotations = 0;
-- for (; calc_num_annotations < num_annotations; calc_num_annotations++) {
-- if (!rewrite_cp_refs_in_annotation_struct(annotations_typeArray,
-- byte_i_ref, THREAD)) {
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("bad annotation_struct at %d", calc_num_annotations));
-- // propagate failure back to caller
-- return false;
-- }
-- }
-- assert(num_annotations == calc_num_annotations, "sanity check");
--
-- return true;
--} // end rewrite_cp_refs_in_annotations_typeArray()
--
--
--// Rewrite constant pool references in the annotation struct portion of
--// an annotations_typeArray. This "structure" is from section 4.8.15 of
--// the 2nd-edition of the VM spec:
--//
--// struct annotation {
--// u2 type_index;
--// u2 num_element_value_pairs;
--// {
--// u2 element_name_index;
--// element_value value;
--// } element_value_pairs[num_element_value_pairs];
--// }
--//
--bool VM_RedefineClasses::rewrite_cp_refs_in_annotation_struct(
-- typeArrayHandle annotations_typeArray, int &byte_i_ref, TRAPS) {
-- if ((byte_i_ref + 2 + 2) > annotations_typeArray->length()) {
-- // not enough room for smallest annotation_struct
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("length() is too small for annotation_struct"));
-- return false;
-- }
--
-- u2 type_index = rewrite_cp_ref_in_annotation_data(annotations_typeArray,
-- byte_i_ref, "mapped old type_index=%d", THREAD);
--
-- u2 num_element_value_pairs = Bytes::get_Java_u2((address)
-- annotations_typeArray->byte_at_addr(
-- byte_i_ref));
-- byte_i_ref += 2;
--
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("type_index=%d num_element_value_pairs=%d", type_index,
-- num_element_value_pairs));
--
-- int calc_num_element_value_pairs = 0;
-- for (; calc_num_element_value_pairs < num_element_value_pairs;
-- calc_num_element_value_pairs++) {
-- if ((byte_i_ref + 2) > annotations_typeArray->length()) {
-- // not enough room for another element_name_index, let alone
-- // the rest of another component
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("length() is too small for element_name_index"));
-- return false;
-- }
--
-- u2 element_name_index = rewrite_cp_ref_in_annotation_data(
-- annotations_typeArray, byte_i_ref,
-- "mapped old element_name_index=%d", THREAD);
--
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("element_name_index=%d", element_name_index));
--
-- if (!rewrite_cp_refs_in_element_value(annotations_typeArray,
-- byte_i_ref, THREAD)) {
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("bad element_value at %d", calc_num_element_value_pairs));
-- // propagate failure back to caller
-- return false;
-- }
-- } // end for each component
-- assert(num_element_value_pairs == calc_num_element_value_pairs,
-- "sanity check");
--
-- return true;
--} // end rewrite_cp_refs_in_annotation_struct()
--
--
--// Rewrite a constant pool reference at the current position in
--// annotations_typeArray if needed. Returns the original constant
--// pool reference if a rewrite was not needed or the new constant
--// pool reference if a rewrite was needed.
--u2 VM_RedefineClasses::rewrite_cp_ref_in_annotation_data(
-- typeArrayHandle annotations_typeArray, int &byte_i_ref,
-- const char * trace_mesg, TRAPS) {
--
-- address cp_index_addr = (address)
-- annotations_typeArray->byte_at_addr(byte_i_ref);
-- u2 old_cp_index = Bytes::get_Java_u2(cp_index_addr);
-- u2 new_cp_index = find_new_index(old_cp_index);
-- if (new_cp_index != 0) {
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD, (trace_mesg, old_cp_index));
-- Bytes::put_Java_u2(cp_index_addr, new_cp_index);
-- old_cp_index = new_cp_index;
-- }
-- byte_i_ref += 2;
-- return old_cp_index;
-+ // We found an instance klass!
-+ instanceKlass *cur_instance_klass = instanceKlass::cast(k);
-+ cur_instance_klass->clear_type_check_information();
- }
-
-+void VM_RedefineClasses::update_active_methods() {
-
--// Rewrite constant pool references in the element_value portion of an
--// annotations_typeArray. This "structure" is from section 4.8.15.1 of
--// the 2nd-edition of the VM spec:
--//
--// struct element_value {
--// u1 tag;
--// union {
--// u2 const_value_index;
--// {
--// u2 type_name_index;
--// u2 const_name_index;
--// } enum_const_value;
--// u2 class_info_index;
--// annotation annotation_value;
--// struct {
--// u2 num_values;
--// element_value values[num_values];
--// } array_value;
--// } value;
--// }
--//
--bool VM_RedefineClasses::rewrite_cp_refs_in_element_value(
-- typeArrayHandle annotations_typeArray, int &byte_i_ref, TRAPS) {
-+ RC_TRACE(0x00000002, ("Updating active methods"));
-+ JavaThread *java_thread = Threads::first();
-+ while (java_thread != NULL) {
-
-- if ((byte_i_ref + 1) > annotations_typeArray->length()) {
-- // not enough room for a tag let alone the rest of an element_value
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("length() is too small for a tag"));
-+ int stack_depth = 0;
-+ if (java_thread->has_last_Java_frame()) {
-+
-+ RC_TRACE(0x0000000400, ("checking stack of Java thread %s", java_thread->name()));
-+
-+ // vframes are resource allocated
-+ Thread* current_thread = Thread::current();
-+ ResourceMark rm(current_thread);
-+ HandleMark hm(current_thread);
-+
-+ RegisterMap reg_map(java_thread);
-+ frame f = java_thread->last_frame();
-+ vframe* vf = vframe::new_vframe(&f, ®_map, java_thread);
-+ frame* last_entry_frame = NULL;
-+
-+ while (vf != NULL) {
-+ if (vf->is_java_frame()) {
-+ // java frame (interpreted, compiled, ...)
-+ javaVFrame *jvf = javaVFrame::cast(vf);
-+
-+ if (!(jvf->method()->is_native())) {
-+ int bci = jvf->bci();
-+ RC_TRACE(0x00000400, ("found method: %s / bci=%d", jvf->method()->name()->as_C_string(), bci));
-+ ResourceMark rm(Thread::current());
-+ HandleMark hm;
-+ instanceKlassHandle klass(jvf->method()->method_holder());
-+
-+ if (jvf->method()->new_version() != NULL && jvf->is_interpreted_frame()) {
-+
-+
-+ RC_TRACE(0x00000002, ("Found method that should just be updated to the newest version %s",
-+ jvf->method()->name_and_sig_as_C_string()));
-+
-+ if (RC_TRACE_ENABLED(0x01000000)) {
-+ int code_size = jvf->method()->code_size();
-+ char *code_base_old = (char*)jvf->method()->code_base();
-+ char *code_base_new = (char*)jvf->method()->new_version()->code_base();
-+ for (int i=0; i<code_size; i++) {
-+ tty->print_cr("old=%d new=%d", *code_base_old++, *code_base_new++);
-+ }
-+ jvf->method()->print_codes_on(tty);
-+ jvf->method()->new_version()->print_codes_on(tty);
-+ }
-+
-+ assert(jvf->is_interpreted_frame(), "Every frame must be interpreted!");
-+ interpretedVFrame *iframe = (interpretedVFrame *)jvf;
-+
-+
-+ if (RC_TRACE_ENABLED(0x01000000)) {
-+ constantPoolCacheOop cp_old = jvf->method()->constants()->cache();
-+ tty->print_cr("old cp");
-+ for (int i=0; i<cp_old->length(); i++) {
-+ cp_old->entry_at(i)->print(tty, i);
-+ }
-+ constantPoolCacheOop cp_new = jvf->method()->new_version()->constants()->cache();
-+ tty->print_cr("new cp");
-+ for (int i=0; i<cp_new->length(); i++) {
-+ cp_new->entry_at(i)->print(tty, i);
-+ }
-+ }
-+
-+ iframe->set_method(jvf->method()->new_version(), bci);
-+ RC_TRACE(0x00000002, ("Updated method to newer version"));
-+ assert(jvf->method()->new_version() == NULL, "must be latest version");
-+
-+ }
-+ }
-+ }
-+ vf = vf->sender();
-+ }
-+ }
-+
-+ // Advance to next thread
-+ java_thread = java_thread->next();
-+ }
-+}
-+
-+void VM_RedefineClasses::method_forwarding() {
-+
-+ int forwarding_count = 0;
-+ JavaThread *java_thread = Threads::first();
-+ while (java_thread != NULL) {
-+
-+ int stack_depth = 0;
-+ if (java_thread->has_last_Java_frame()) {
-+
-+ RC_TRACE(0x00000400, ("checking stack of Java thread %s", java_thread->name()));
-+
-+ // vframes are resource allocated
-+ Thread* current_thread = Thread::current();
-+ ResourceMark rm(current_thread);
-+ HandleMark hm(current_thread);
-+
-+ RegisterMap reg_map(java_thread);
-+ frame f = java_thread->last_frame();
-+ vframe* vf = vframe::new_vframe(&f, ®_map, java_thread);
-+ frame* last_entry_frame = NULL;
-+
-+ while (vf != NULL) {
-+ if (vf->is_java_frame()) {
-+ // java frame (interpreted, compiled, ...)
-+ javaVFrame *jvf = javaVFrame::cast(vf);
-+
-+ if (!(jvf->method()->is_native())) {
-+ RC_TRACE(0x00008000, ("found method: %s",
-+ jvf->method()->name()->as_C_string()));
-+ ResourceMark rm(Thread::current());
-+ HandleMark hm;
-+ instanceKlassHandle klass(jvf->method()->method_holder());
-+ methodOop m = jvf->method();
-+ int bci = jvf->bci();
-+ RC_TRACE(0x00008000, ("klass redef %d",
-+ klass->is_redefining()));
-+
-+ if (klass->new_version() != NULL && m->new_version() == NULL) {
-+ RC_TRACE(0x00008000, ("found potential forwarding method: %s",
-+ m->name()->as_C_string()));
-+
-+ klassOop new_klass = klass->newest_version();
-+ methodOop new_method = new_klass->klass_part()->lookup_method(m->name(), m->signature());
-+ RC_TRACE(0x00000002, ("%d %d",
-+ new_method,
-+ new_method->constMethod()->has_code_section_table()));
-+
-+ if (new_method != NULL && new_method->constMethod()->has_code_section_table()) {
-+ RC_TRACE(0x00008000, ("found code section table for method: %s",
-+ new_method->name()->as_C_string()));
-+ m->set_forward_method(new_method);
-+ if (new_method->max_locals() != m->max_locals()) {
-+ tty->print_cr("new_m max locals: %d old_m max locals: %d", new_method->max_locals(), m->max_locals());
-+ }
-+ assert(new_method->max_locals() == m->max_locals(), "number of locals must match");
-+ assert(new_method->max_stack() == m->max_stack(), "number of stack values must match");
-+ if (jvf->is_interpreted_frame()) {
-+ if (m->is_in_code_section(bci)) {
-+ // We must transfer now and cannot delay until next NOP.
-+ int new_bci = m->calculate_forward_bci(bci, new_method);
-+ interpretedVFrame* iframe = interpretedVFrame::cast(jvf);
-+ RC_TRACE(0x00000002, ("Transferring execution of %s to new method old_bci=%d new_bci=%d",
-+ new_method->name()->as_C_string(),
-+ bci,
-+ new_bci));
-+ iframe->set_method(new_method, new_bci);
-+ } else {
-+ RC_TRACE(0x00000002, ("Delaying method forwarding of %s because %d is not in a code section",
-+ new_method->name()->as_C_string(),
-+ bci));
-+ }
-+ } else {
-+ RC_TRACE(0x00000002, ("Delaying method forwarding of %s because method is compiled",
-+ new_method->name()->as_C_string()));
-+ }
-+ }
-+ }
-+ }
-+ }
-+ vf = vf->sender();
-+ }
-+ }
-+
-+ // Advance to next thread
-+ java_thread = java_thread->next();
-+ }
-+
-+ RC_TRACE(0x00000001, ("Method forwarding applied to %d methods",
-+ forwarding_count));
-+}
-+
-+bool VM_RedefineClasses::check_method_stacks() {
-+
-+ JavaThread *java_thread = Threads::first();
-+ while (java_thread != NULL) {
-+
-+ int stack_depth = 0;
-+ if (java_thread->has_last_Java_frame()) {
-+
-+ RC_TRACE(0x00000400, ("checking stack of Java thread %s", java_thread->name()));
-+
-+ // vframes are resource allocated
-+ Thread* current_thread = Thread::current();
-+ ResourceMark rm(current_thread);
-+ HandleMark hm(current_thread);
-+
-+ RegisterMap reg_map(java_thread);
-+ frame f = java_thread->last_frame();
-+ vframe* vf = vframe::new_vframe(&f, ®_map, java_thread);
-+ frame* last_entry_frame = NULL;
-+
-+ while (vf != NULL) {
-+ if (vf->is_java_frame()) {
-+ // java frame (interpreted, compiled, ...)
-+ javaVFrame *jvf = javaVFrame::cast(vf);
-+
-+ if (!(jvf->method()->is_native())) {
-+ RC_TRACE(0x00000400, ("found method: %s", jvf->method()->name()->as_C_string()));
-+ ResourceMark rm(Thread::current());
-+ HandleMark hm;
-+ instanceKlassHandle klass(jvf->method()->method_holder());
-+
-+ StackValueCollection *locals = jvf->locals();
-+ const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
-+ char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
-+
-+ for (int i=0; i<locals->size(); i++) {
-+ StackValue *stack_value = locals->at(i);
-+ if (stack_value->type() == T_OBJECT) {
-+ Handle obj = stack_value->get_obj();
-+ if (!obj.is_null() && obj->klass()->klass_part()->newest_version()->klass_part()->check_redefinition_flag(Klass::RemoveSuperType)) {
-+
-+ // OK, so this is a possible failure => check local variable table, if it could be OK.
-+ bool result = false;
-+ methodOop method = jvf->method();
-+ if (method->has_localvariable_table()) {
-+ LocalVariableTableElement *elem = jvf->method()->localvariable_table_start();
-+ for (int j=0; j<method->localvariable_table_length(); j++) {
-+
-+ if (elem->slot == i) {
-+
-+ // Matching index found
-+
-+ if (elem->start_bci <= jvf->bci() && elem->start_bci + elem->length > jvf->bci()) {
-+
-+ // Also in range!!
-+ Symbol* signature = jvf->method()->constants()->symbol_at(elem->descriptor_cp_index);
-+ Symbol* klass_name = signature_to_class_name(signature);
-+
-+ klassOop local_klass = SystemDictionary::find(klass_name, jvf->method()->method_holder()->klass_part()->class_loader(), jvf->method()->method_holder()->klass_part()->protection_domain(), Thread::current())->klass_part()->newest_version();
-+ klassOop cur = obj->klass()->klass_part()->newest_version();
-+
-+ // Field is not null
-+ if (cur->klass_part()->newest_version()->klass_part()->is_subtype_of(local_klass)) {
-+ // We are OK
-+ RC_TRACE(0x00008000, ("Local variable value is OK (local_klass=%s, cur_klass=%s)",
-+ local_klass->klass_part()->name()->as_C_string(), cur->klass_part()->name()->as_C_string()));
-+ result = true;
-+ } else {
-+ // Failure!
-+ RC_TRACE(0x00000001, ("Local variable value is INVALID - abort redefinition (local_klass=%s, cur_klass=%s)",
-+ local_klass->klass_part()->name()->as_C_string(),
-+ cur->klass_part()->name()->as_C_string()));
-+ return false;
-+ }
-+ }
-+ }
-+
-+ elem++;
-+ }
-+ } else {
-+ RC_TRACE(0x00000002, ("Method %s does not have a local variable table => abort",
-+ method->name_and_sig_as_C_string()));
-+ }
-+
-+ if (!result) {
-+ return false;
-+ }
-+
-+ RC_TRACE(0x00008000, ("Verifying class %s",
-+ jvf->method()->method_holder()->klass_part()->name()->as_C_string()));
-+
-+ Symbol* exception_name;
-+ const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
-+ char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
-+
-+ Thread::current()->set_pretend_new_universe(true);
-+ ClassVerifier split_verifier(klass, Thread::current());
-+ split_verifier.verify_method(jvf->method(), Thread::current());
-+ exception_name = split_verifier.result();
-+ Thread::current()->set_pretend_new_universe(false);
-+
-+ if (exception_name != NULL) {
-+
-+ RC_TRACE(0x00000001, ("Verification of class %s failed",
-+ jvf->method()->method_holder()->klass_part()->name()->as_C_string()));
-+ RC_TRACE(0x00000001, ("Exception: %s",
-+ exception_name->as_C_string()));
-+ RC_TRACE(0x00000001, ("Message: %s",
-+ message_buffer));
-+ Thread::current()->clear_pending_exception();
-+ return false;
-+ }
-+
-+ }
-+ }
-+ }
-+ }
-+ }
-+ vf = vf->sender();
-+ }
-+ }
-+
-+ // Advance to next thread
-+ java_thread = java_thread->next();
-+ }
-+
-+ return true;
-+}
-+
-+bool VM_RedefineClasses::check_method(methodOop method) {
-+
-+
-+ return true;
-+}
-+
-+// Warning: destroys redefinition level values of klasses.
-+bool VM_RedefineClasses::check_loaded_methods() {
-+
-+ class CheckLoadedMethodsClosure : public ObjectClosure {
-+
-+ private:
-+
-+ bool _result;
-+ GrowableArray<klassOop> *_dangerous_klasses;
-+
-+ public:
-+ CheckLoadedMethodsClosure(GrowableArray<klassOop> *dangerous_klasses) {
-+ _result = true;
-+ _dangerous_klasses = dangerous_klasses;
-+ }
-+
-+ bool result() {
-+ return _result;
-+ }
-+
-+ bool is_class_dangerous(klassOop k) {
-+ return k->klass_part()->newest_version()->klass_part()->check_redefinition_flag(Klass::RemoveSuperType);
-+ }
-+
-+ bool can_be_affected(instanceKlass *klass) {
-+
-+ constantPoolOop cp = klass->constants();
-+
-+ Thread *THREAD = Thread::current();
-+ klassOop k;
-+ Symbol* symbol;
-+
-+ for (int i=1; i<cp->length(); i++) {
-+ jbyte tag = cp->tag_at(i).value();
-+ switch(tag) {
-+ case JVM_CONSTANT_Long:
-+ case JVM_CONSTANT_Double:
-+ i++;
-+ break;
-+
-+ case JVM_CONSTANT_Utf8:
-+ case JVM_CONSTANT_Unicode:
-+ case JVM_CONSTANT_Integer:
-+ case JVM_CONSTANT_Float:
-+ case JVM_CONSTANT_String:
-+ case JVM_CONSTANT_Fieldref:
-+ case JVM_CONSTANT_Methodref:
-+ case JVM_CONSTANT_InterfaceMethodref:
-+ case JVM_CONSTANT_ClassIndex:
-+ case JVM_CONSTANT_UnresolvedString:
-+ case JVM_CONSTANT_StringIndex:
-+ case JVM_CONSTANT_UnresolvedClassInError:
-+ case JVM_CONSTANT_Object:
-+ // do nothing
-+ break;
-+
-+ case JVM_CONSTANT_Class:
-+ k = cp->klass_at(i, CHECK_(true));
-+ if (is_class_dangerous(k)) {
-+ RC_TRACE(0x00000002, ("Class %s is potentially affected, because at cp[%d] references class %s",
-+ klass->name()->as_C_string(),
-+ i,
-+ k->klass_part()->name()->as_C_string()));
-+ return true;
-+ }
-+ break;
-+
-+ case JVM_CONSTANT_NameAndType:
-+ symbol = cp->symbol_at(cp->signature_ref_index_at(i));
-+ if (symbol->byte_at(0) == '(') {
-+ // This must be a method
-+ SignatureStream signatureStream(symbol);
-+ while (true) {
-+
-+ if (signatureStream.is_array()) {
-+ Symbol* cur_signature = signatureStream.as_symbol(Thread::current());
-+ if (is_type_signature_dangerous(cur_signature)) {
-+ return true;
-+ }
-+ } else if (signatureStream.is_object()) {
-+ if (is_symbol_dangerous(signatureStream.as_symbol(Thread::current()))) {
-+ return true;
-+ }
-+ }
-+
-+ if (signatureStream.at_return_type()) {
-+ break;
-+ }
-+
-+ signatureStream.next();
-+ }
-+
-+ } else if (is_type_signature_dangerous(symbol)) {
-+ return true;
-+ }
-+ break;
-+
-+ case JVM_CONSTANT_UnresolvedClass:
-+ symbol = cp->unresolved_klass_at(i);
-+ if (is_symbol_dangerous(symbol)) {
-+ return true;
-+ }
-+ break;
-+
-+ default:
-+ ShouldNotReachHere();
-+ }
-+ }
-+
-+ return false;
-+ }
-+
-+ bool is_type_signature_dangerous(Symbol* signature) {
-+ // This must be a field type
-+ if (FieldType::is_obj(signature)) {
-+ Symbol* name = signature_to_class_name(signature);
-+ if (is_symbol_dangerous(name)) {
-+ return true;
-+ }
-+ } else if (FieldType::is_array(signature)) {
-+ //jint dimension;
-+ //Symbol* object_key;
-+ FieldArrayInfo fd;
-+ FieldType::get_array_info(signature, fd, Thread::current());
-+ if (is_symbol_dangerous(fd.object_key())) {
-+ return true;
-+ }
-+ }
-+ return false;
-+ }
-+
-+ bool is_symbol_dangerous(Symbol* symbol) {
-+ for (int i=0; i<_dangerous_klasses->length(); i++) {
-+ if(_dangerous_klasses->at(i)->klass_part()->name() == symbol) {
-+ RC_TRACE(0x00000002, ("Found constant pool index %d references class %s",
-+ i,
-+ symbol->as_C_string()));
-+ return true;
-+ }
-+ }
-+ return false;
-+ }
-+
-+ virtual void do_object(oop obj) {
-+
-+ if (!_result) return;
-+
-+ klassOop klassObj = (klassOop)obj;
-+ Thread *THREAD = Thread::current();
-+
-+ // We found an instance klass!
-+ instanceKlass *klass = instanceKlass::cast(klassObj);
-+ instanceKlassHandle handle(klassObj);
-+
-+ RC_TRACE(0x00000400, ("Check if verification is necessary for class %s major_version=%d", handle->name()->as_C_string(), handle->major_version()));
-+
-+ if (!can_be_affected(klass)) {
-+ RC_TRACE(0x00000400, ("Skipping verification of class %s major_version=%d", handle->name()->as_C_string(), handle->major_version()));
-+ return;
-+ }
-+
-+ if (handle->major_version() < Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION) {
-+ RC_TRACE(0x00000001, ("Failing because cannot verify class %s major_version=%d", handle->name()->as_C_string(), handle->major_version()));
-+ _result = false;
-+ return;
-+ }
-+
-+ RC_TRACE(0x00000001, ("Verifying class %s", handle->name()->as_C_string()));
-+
-+ if (!Verifier::verify(handle, Verifier::NoException, true, false, Thread::current())) {
-+
-+ RC_TRACE(0x00000001, ("Verification of class %s failed", handle->name()->as_C_string()));
-+ //Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
-+ //RC_TRACE(0x00000002, ("exception when verifying class: '%s'", ex_name->as_C_string());
-+ //PENDING_EXCEPTION->print();
-+ CLEAR_PENDING_EXCEPTION;
-+ _result = false;
-+ }
-+
-+ /*int method_count = klass->methods()->length();
-+ for (int i=0; i<method_count; i++) {
-+ methodOop cur_method = (methodOop)klass->methods()->obj_at(i);
-+ if (!check_method(cur_method)) {
-+ RC_TRACE(0x00000001, ("Failed to verify consistency of method %s of klass %s", cur_method->name()->as_C_string(), klass->name()->as_C_string());
-+ }
-+ }*/
-+ }
-+ };
-+
-+ // TODO: Check bytecodes in case of interface => class or class => interface etc..
-+
-+ GrowableArray<klassOop> dangerous_klasses;
-+ for (int i=0; i<_new_classes->length(); i++) {
-+ instanceKlassHandle handle = _new_classes->at(i);
-+ if (handle->check_redefinition_flag(Klass::RemoveSuperType)) {
-+ dangerous_klasses.append(handle());
-+ }
-+ }
-+
-+ CheckLoadedMethodsClosure checkLoadedMethodsClosure(&dangerous_klasses);
-+ Thread::current()->set_pretend_new_universe(true);
-+ SystemDictionary::classes_do(&checkLoadedMethodsClosure);
-+ Thread::current()->set_pretend_new_universe(false);
-+
-+
-+ return checkLoadedMethodsClosure.result();
-+}
-+
-+bool VM_RedefineClasses::check_type_consistency() {
-+
-+ Universe::set_verify_in_progress(true);
-+
-+ SystemDictionary::classes_do(calculate_type_check_information);
-+ bool result = check_field_value_types();
-+ SystemDictionary::classes_do(clear_type_check_information);
-+ if (!result) {
-+ RC_TRACE(0x00000001, ("Aborting redefinition because of wrong field or array element value!"));
-+ Universe::set_verify_in_progress(false);
- return false;
- }
-
-- u1 tag = annotations_typeArray->byte_at(byte_i_ref);
-- byte_i_ref++;
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("tag='%c'", tag));
-+ result = check_method_stacks();
-+ if (!result) {
-+ RC_TRACE(0x00000001, ("Aborting redefinition because of wrong value on the stack"));
-+ Universe::set_verify_in_progress(false);
-+ return false;
-+ }
-
-- switch (tag) {
-- // These BaseType tag values are from Table 4.2 in VM spec:
-- case 'B': // byte
-- case 'C': // char
-- case 'D': // double
-- case 'F': // float
-- case 'I': // int
-- case 'J': // long
-- case 'S': // short
-- case 'Z': // boolean
-+ result = check_loaded_methods();
-+ if (!result) {
-+ RC_TRACE(0x00000001, ("Aborting redefinition because of wrong loaded method"));
-+ Universe::set_verify_in_progress(false);
-+ return false;
-+ }
-
-- // The remaining tag values are from Table 4.8 in the 2nd-edition of
-- // the VM spec:
-- case 's':
-- {
-- // For the above tag values (including the BaseType values),
-- // value.const_value_index is right union field.
-+ RC_TRACE(0x00000001, ("Verification passed => hierarchy change is valid!"));
-+ Universe::set_verify_in_progress(false);
-+ return true;
-+}
-
-- if ((byte_i_ref + 2) > annotations_typeArray->length()) {
-- // not enough room for a const_value_index
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("length() is too small for a const_value_index"));
-- return false;
-+void VM_RedefineClasses::rollback() {
-+ RC_TRACE(0x00000001, ("Rolling back redefinition!"));
-+ SystemDictionary::rollback_redefinition();
-+
-+ RC_TRACE(0x00000001, ("After rolling back system dictionary!"));
-+ for (int i=0; i<_new_classes->length(); i++) {
-+ SystemDictionary::remove_from_hierarchy(_new_classes->at(i));
-+ }
-+
-+ for (int i=0; i<_new_classes->length(); i++) {
-+ instanceKlassHandle new_class = _new_classes->at(i);
-+ new_class->set_redefining(false);
-+ new_class->old_version()->klass_part()->set_new_version(NULL);
-+ new_class->set_old_version(NULL);
-+ }
-+
-+}
-+
-+template <class T> void VM_RedefineClasses::do_oop_work(T* p) {
-+ T heap_oop = oopDesc::load_heap_oop(p);
-+ if (!oopDesc::is_null(heap_oop)) {
-+ oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
-+ if (obj->is_instanceKlass()) {
-+ klassOop klass = (klassOop)obj;
-+ // DCEVM: note: can overwrite owner of old_klass constants pool with new_klass, so we need to fix it back later
-+ if (klass->new_version() != NULL && klass->new_version()->klass_part()->is_redefining()) {
-+ obj = klass->klass_part()->new_version();
-+ oopDesc::encode_store_heap_oop_not_null(p, obj);
- }
-+ } else if (obj->blueprint()->newest_version() == SystemDictionary::Class_klass()->klass_part()->newest_version()) {
-+ // update references to java.lang.Class to point to newest version. Only update references to non-primitive
-+ // java.lang.Class instances.
-+ klassOop klass_oop = java_lang_Class::as_klassOop(obj);
-+ if (klass_oop != NULL) {
-+ if (klass_oop->new_version() != NULL && klass_oop->new_version()->klass_part()->is_redefining()) {
-+ obj = klass_oop->new_version()->java_mirror();
-+ } else if (klass_oop->klass_part()->is_redefining()) {
-+ obj = klass_oop->java_mirror();
-+ }
-+ oopDesc::encode_store_heap_oop_not_null(p, obj);
-
-- u2 const_value_index = rewrite_cp_ref_in_annotation_data(
-- annotations_typeArray, byte_i_ref,
-- "mapped old const_value_index=%d", THREAD);
-
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("const_value_index=%d", const_value_index));
-- } break;
--
-- case 'e':
-- {
-- // for the above tag value, value.enum_const_value is right union field
--
-- if ((byte_i_ref + 4) > annotations_typeArray->length()) {
-- // not enough room for a enum_const_value
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("length() is too small for a enum_const_value"));
-- return false;
-- }
--
-- u2 type_name_index = rewrite_cp_ref_in_annotation_data(
-- annotations_typeArray, byte_i_ref,
-- "mapped old type_name_index=%d", THREAD);
--
-- u2 const_name_index = rewrite_cp_ref_in_annotation_data(
-- annotations_typeArray, byte_i_ref,
-- "mapped old const_name_index=%d", THREAD);
--
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("type_name_index=%d const_name_index=%d", type_name_index,
-- const_name_index));
-- } break;
--
-- case 'c':
-- {
-- // for the above tag value, value.class_info_index is right union field
--
-- if ((byte_i_ref + 2) > annotations_typeArray->length()) {
-- // not enough room for a class_info_index
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("length() is too small for a class_info_index"));
-- return false;
-- }
--
-- u2 class_info_index = rewrite_cp_ref_in_annotation_data(
-- annotations_typeArray, byte_i_ref,
-- "mapped old class_info_index=%d", THREAD);
--
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("class_info_index=%d", class_info_index));
-- } break;
--
-- case '@':
-- // For the above tag value, value.attr_value is the right union
-- // field. This is a nested annotation.
-- if (!rewrite_cp_refs_in_annotation_struct(annotations_typeArray,
-- byte_i_ref, THREAD)) {
-- // propagate failure back to caller
-- return false;
-- }
-- break;
--
-- case '[':
-- {
-- if ((byte_i_ref + 2) > annotations_typeArray->length()) {
-- // not enough room for a num_values field
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("length() is too small for a num_values field"));
-- return false;
-- }
--
-- // For the above tag value, value.array_value is the right union
-- // field. This is an array of nested element_value.
-- u2 num_values = Bytes::get_Java_u2((address)
-- annotations_typeArray->byte_at_addr(byte_i_ref));
-- byte_i_ref += 2;
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("num_values=%d", num_values));
--
-- int calc_num_values = 0;
-- for (; calc_num_values < num_values; calc_num_values++) {
-- if (!rewrite_cp_refs_in_element_value(
-- annotations_typeArray, byte_i_ref, THREAD)) {
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("bad nested element_value at %d", calc_num_values));
-- // propagate failure back to caller
-- return false;
-+ // FIXME: DCEVM: better implementation?
-+ // Starting from JDK 7 java_mirror can be kept in the regular heap. Therefore, it is possible
-+ // that new java_mirror is in the young generation whereas p is in tenured generation. In that
-+ // case we need to run write barrier to make sure card table is properly updated. This will
-+ // allow JVM to detect reference in tenured generation properly during young generation GC.
-+ if (Universe::heap()->is_in_reserved(p)) {
-+ if (GenCollectedHeap::heap()->is_in_young(obj)) {
-+ GenRemSet* rs = GenCollectedHeap::heap()->rem_set();
-+ assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind.");
-+ CardTableRS* _rs = (CardTableRS*)rs;
-+ _rs->inline_write_ref_field_gc(p, obj);
-+ }
- }
- }
-- assert(num_values == calc_num_values, "sanity check");
-- } break;
--
-- default:
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("bad tag=0x%x", tag));
-- return false;
-- } // end decode tag field
--
-- return true;
--} // end rewrite_cp_refs_in_element_value()
--
--
--// Rewrite constant pool references in a fields_annotations field.
--bool VM_RedefineClasses::rewrite_cp_refs_in_fields_annotations(
-- instanceKlassHandle scratch_class, TRAPS) {
--
-- objArrayHandle fields_annotations(THREAD,
-- scratch_class->fields_annotations());
--
-- if (fields_annotations.is_null() || fields_annotations->length() == 0) {
-- // no fields_annotations so nothing to do
-- return true;
-- }
--
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("fields_annotations length=%d", fields_annotations->length()));
--
-- for (int i = 0; i < fields_annotations->length(); i++) {
-- typeArrayHandle field_annotations(THREAD,
-- (typeArrayOop)fields_annotations->obj_at(i));
-- if (field_annotations.is_null() || field_annotations->length() == 0) {
-- // this field does not have any annotations so skip it
-- continue;
-- }
--
-- int byte_i = 0; // byte index into field_annotations
-- if (!rewrite_cp_refs_in_annotations_typeArray(field_annotations, byte_i,
-- THREAD)) {
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("bad field_annotations at %d", i));
-- // propagate failure back to caller
-- return false;
- }
- }
-+}
-
-- return true;
--} // end rewrite_cp_refs_in_fields_annotations()
-+void VM_RedefineClasses::swap_marks(oop first, oop second) {
-+ markOop first_mark = first->mark();
-+ markOop second_mark = second->mark();
-+ first->set_mark(second_mark);
-+ second->set_mark(first_mark);
-+}
-
-+void VM_RedefineClasses::doit() {
-+ Thread *thread = Thread::current();
-
--// Rewrite constant pool references in a methods_annotations field.
--bool VM_RedefineClasses::rewrite_cp_refs_in_methods_annotations(
-- instanceKlassHandle scratch_class, TRAPS) {
-+ RC_TRACE(0x00000001, ("Entering doit!"));
-
-- objArrayHandle methods_annotations(THREAD,
-- scratch_class->methods_annotations());
-
-- if (methods_annotations.is_null() || methods_annotations->length() == 0) {
-- // no methods_annotations so nothing to do
-- return true;
-- }
-+ if ((_max_redefinition_flags & Klass::RemoveSuperType) != 0) {
-
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("methods_annotations length=%d", methods_annotations->length()));
-+ RC_TIMER_START(_timer_check_type);
-
-- for (int i = 0; i < methods_annotations->length(); i++) {
-- typeArrayHandle method_annotations(THREAD,
-- (typeArrayOop)methods_annotations->obj_at(i));
-- if (method_annotations.is_null() || method_annotations->length() == 0) {
-- // this method does not have any annotations so skip it
-- continue;
-- }
--
-- int byte_i = 0; // byte index into method_annotations
-- if (!rewrite_cp_refs_in_annotations_typeArray(method_annotations, byte_i,
-- THREAD)) {
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("bad method_annotations at %d", i));
-- // propagate failure back to caller
-- return false;
-- }
-- }
--
-- return true;
--} // end rewrite_cp_refs_in_methods_annotations()
--
--
--// Rewrite constant pool references in a methods_parameter_annotations
--// field. This "structure" is adapted from the
--// RuntimeVisibleParameterAnnotations_attribute described in section
--// 4.8.17 of the 2nd-edition of the VM spec:
--//
--// methods_parameter_annotations_typeArray {
--// u1 num_parameters;
--// {
--// u2 num_annotations;
--// annotation annotations[num_annotations];
--// } parameter_annotations[num_parameters];
--// }
--//
--bool VM_RedefineClasses::rewrite_cp_refs_in_methods_parameter_annotations(
-- instanceKlassHandle scratch_class, TRAPS) {
--
-- objArrayHandle methods_parameter_annotations(THREAD,
-- scratch_class->methods_parameter_annotations());
--
-- if (methods_parameter_annotations.is_null()
-- || methods_parameter_annotations->length() == 0) {
-- // no methods_parameter_annotations so nothing to do
-- return true;
-- }
--
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("methods_parameter_annotations length=%d",
-- methods_parameter_annotations->length()));
--
-- for (int i = 0; i < methods_parameter_annotations->length(); i++) {
-- typeArrayHandle method_parameter_annotations(THREAD,
-- (typeArrayOop)methods_parameter_annotations->obj_at(i));
-- if (method_parameter_annotations.is_null()
-- || method_parameter_annotations->length() == 0) {
-- // this method does not have any parameter annotations so skip it
-- continue;
-- }
--
-- if (method_parameter_annotations->length() < 1) {
-- // not enough room for a num_parameters field
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("length() is too small for a num_parameters field at %d", i));
-- return false;
-- }
--
-- int byte_i = 0; // byte index into method_parameter_annotations
--
-- u1 num_parameters = method_parameter_annotations->byte_at(byte_i);
-- byte_i++;
--
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("num_parameters=%d", num_parameters));
--
-- int calc_num_parameters = 0;
-- for (; calc_num_parameters < num_parameters; calc_num_parameters++) {
-- if (!rewrite_cp_refs_in_annotations_typeArray(
-- method_parameter_annotations, byte_i, THREAD)) {
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("bad method_parameter_annotations at %d", calc_num_parameters));
-- // propagate failure back to caller
-- return false;
-- }
-- }
-- assert(num_parameters == calc_num_parameters, "sanity check");
-- }
--
-- return true;
--} // end rewrite_cp_refs_in_methods_parameter_annotations()
--
--
--// Rewrite constant pool references in a methods_default_annotations
--// field. This "structure" is adapted from the AnnotationDefault_attribute
--// that is described in section 4.8.19 of the 2nd-edition of the VM spec:
--//
--// methods_default_annotations_typeArray {
--// element_value default_value;
--// }
--//
--bool VM_RedefineClasses::rewrite_cp_refs_in_methods_default_annotations(
-- instanceKlassHandle scratch_class, TRAPS) {
--
-- objArrayHandle methods_default_annotations(THREAD,
-- scratch_class->methods_default_annotations());
--
-- if (methods_default_annotations.is_null()
-- || methods_default_annotations->length() == 0) {
-- // no methods_default_annotations so nothing to do
-- return true;
-- }
--
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("methods_default_annotations length=%d",
-- methods_default_annotations->length()));
--
-- for (int i = 0; i < methods_default_annotations->length(); i++) {
-- typeArrayHandle method_default_annotations(THREAD,
-- (typeArrayOop)methods_default_annotations->obj_at(i));
-- if (method_default_annotations.is_null()
-- || method_default_annotations->length() == 0) {
-- // this method does not have any default annotations so skip it
-- continue;
-- }
--
-- int byte_i = 0; // byte index into method_default_annotations
--
-- if (!rewrite_cp_refs_in_element_value(
-- method_default_annotations, byte_i, THREAD)) {
-- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
-- ("bad default element_value at %d", i));
-- // propagate failure back to caller
-- return false;
-- }
-- }
--
-- return true;
--} // end rewrite_cp_refs_in_methods_default_annotations()
--
--
--// Rewrite constant pool references in the method's stackmap table.
--// These "structures" are adapted from the StackMapTable_attribute that
--// is described in section 4.8.4 of the 6.0 version of the VM spec
--// (dated 2005.10.26):
--// file:///net/quincunx.sfbay/export/gbracha/ClassFile-Java6.pdf
--//
--// stack_map {
--// u2 number_of_entries;
--// stack_map_frame entries[number_of_entries];
--// }
--//
--void VM_RedefineClasses::rewrite_cp_refs_in_stack_map_table(
-- methodHandle method, TRAPS) {
--
-- if (!method->has_stackmap_table()) {
-- return;
-- }
--
-- typeArrayOop stackmap_data = method->stackmap_data();
-- address stackmap_p = (address)stackmap_data->byte_at_addr(0);
-- address stackmap_end = stackmap_p + stackmap_data->length();
--
-- assert(stackmap_p + 2 <= stackmap_end, "no room for number_of_entries");
-- u2 number_of_entries = Bytes::get_Java_u2(stackmap_p);
-- stackmap_p += 2;
--
-- RC_TRACE_WITH_THREAD(0x04000000, THREAD,
-- ("number_of_entries=%u", number_of_entries));
--
-- // walk through each stack_map_frame
-- u2 calc_number_of_entries = 0;
-- for (; calc_number_of_entries < number_of_entries; calc_number_of_entries++) {
-- // The stack_map_frame structure is a u1 frame_type followed by
-- // 0 or more bytes of data:
-- //
-- // union stack_map_frame {
-- // same_frame;
-- // same_locals_1_stack_item_frame;
-- // same_locals_1_stack_item_frame_extended;
-- // chop_frame;
-- // same_frame_extended;
-- // append_frame;
-- // full_frame;
-- // }
--
-- assert(stackmap_p + 1 <= stackmap_end, "no room for frame_type");
-- // The Linux compiler does not like frame_type to be u1 or u2. It
-- // issues the following warning for the first if-statement below:
-- //
-- // "warning: comparison is always true due to limited range of data type"
-- //
-- u4 frame_type = *stackmap_p;
-- stackmap_p++;
--
-- // same_frame {
-- // u1 frame_type = SAME; /* 0-63 */
-- // }
-- if (frame_type >= 0 && frame_type <= 63) {
-- // nothing more to do for same_frame
-- }
--
-- // same_locals_1_stack_item_frame {
-- // u1 frame_type = SAME_LOCALS_1_STACK_ITEM; /* 64-127 */
-- // verification_type_info stack[1];
-- // }
-- else if (frame_type >= 64 && frame_type <= 127) {
-- rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end,
-- calc_number_of_entries, frame_type, THREAD);
-- }
--
-- // reserved for future use
-- else if (frame_type >= 128 && frame_type <= 246) {
-- // nothing more to do for reserved frame_types
-- }
--
-- // same_locals_1_stack_item_frame_extended {
-- // u1 frame_type = SAME_LOCALS_1_STACK_ITEM_EXTENDED; /* 247 */
-- // u2 offset_delta;
-- // verification_type_info stack[1];
-- // }
-- else if (frame_type == 247) {
-- stackmap_p += 2;
-- rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end,
-- calc_number_of_entries, frame_type, THREAD);
-- }
--
-- // chop_frame {
-- // u1 frame_type = CHOP; /* 248-250 */
-- // u2 offset_delta;
-- // }
-- else if (frame_type >= 248 && frame_type <= 250) {
-- stackmap_p += 2;
-- }
--
-- // same_frame_extended {
-- // u1 frame_type = SAME_FRAME_EXTENDED; /* 251*/
-- // u2 offset_delta;
-- // }
-- else if (frame_type == 251) {
-- stackmap_p += 2;
-- }
--
-- // append_frame {
-- // u1 frame_type = APPEND; /* 252-254 */
-- // u2 offset_delta;
-- // verification_type_info locals[frame_type - 251];
-- // }
-- else if (frame_type >= 252 && frame_type <= 254) {
-- assert(stackmap_p + 2 <= stackmap_end,
-- "no room for offset_delta");
-- stackmap_p += 2;
-- u1 len = frame_type - 251;
-- for (u1 i = 0; i < len; i++) {
-- rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end,
-- calc_number_of_entries, frame_type, THREAD);
-- }
-- }
--
-- // full_frame {
-- // u1 frame_type = FULL_FRAME; /* 255 */
-- // u2 offset_delta;
-- // u2 number_of_locals;
-- // verification_type_info locals[number_of_locals];
-- // u2 number_of_stack_items;
-- // verification_type_info stack[number_of_stack_items];
-- // }
-- else if (frame_type == 255) {
-- assert(stackmap_p + 2 + 2 <= stackmap_end,
-- "no room for smallest full_frame");
-- stackmap_p += 2;
--
-- u2 number_of_locals = Bytes::get_Java_u2(stackmap_p);
-- stackmap_p += 2;
--
-- for (u2 locals_i = 0; locals_i < number_of_locals; locals_i++) {
-- rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end,
-- calc_number_of_entries, frame_type, THREAD);
-- }
--
-- // Use the largest size for the number_of_stack_items, but only get
-- // the right number of bytes.
-- u2 number_of_stack_items = Bytes::get_Java_u2(stackmap_p);
-- stackmap_p += 2;
--
-- for (u2 stack_i = 0; stack_i < number_of_stack_items; stack_i++) {
-- rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end,
-- calc_number_of_entries, frame_type, THREAD);
-- }
-- }
-- } // end while there is a stack_map_frame
-- assert(number_of_entries == calc_number_of_entries, "sanity check");
--} // end rewrite_cp_refs_in_stack_map_table()
--
--
--// Rewrite constant pool references in the verification type info
--// portion of the method's stackmap table. These "structures" are
--// adapted from the StackMapTable_attribute that is described in
--// section 4.8.4 of the 6.0 version of the VM spec (dated 2005.10.26):
--// file:///net/quincunx.sfbay/export/gbracha/ClassFile-Java6.pdf
--//
--// The verification_type_info structure is a u1 tag followed by 0 or
--// more bytes of data:
--//
--// union verification_type_info {
--// Top_variable_info;
--// Integer_variable_info;
--// Float_variable_info;
--// Long_variable_info;
--// Double_variable_info;
--// Null_variable_info;
--// UninitializedThis_variable_info;
--// Object_variable_info;
--// Uninitialized_variable_info;
--// }
--//
--void VM_RedefineClasses::rewrite_cp_refs_in_verification_type_info(
-- address& stackmap_p_ref, address stackmap_end, u2 frame_i,
-- u1 frame_type, TRAPS) {
--
-- assert(stackmap_p_ref + 1 <= stackmap_end, "no room for tag");
-- u1 tag = *stackmap_p_ref;
-- stackmap_p_ref++;
--
-- switch (tag) {
-- // Top_variable_info {
-- // u1 tag = ITEM_Top; /* 0 */
-- // }
-- // verificationType.hpp has zero as ITEM_Bogus instead of ITEM_Top
-- case 0: // fall through
--
-- // Integer_variable_info {
-- // u1 tag = ITEM_Integer; /* 1 */
-- // }
-- case ITEM_Integer: // fall through
--
-- // Float_variable_info {
-- // u1 tag = ITEM_Float; /* 2 */
-- // }
-- case ITEM_Float: // fall through
--
-- // Double_variable_info {
-- // u1 tag = ITEM_Double; /* 3 */
-- // }
-- case ITEM_Double: // fall through
--
-- // Long_variable_info {
-- // u1 tag = ITEM_Long; /* 4 */
-- // }
-- case ITEM_Long: // fall through
--
-- // Null_variable_info {
-- // u1 tag = ITEM_Null; /* 5 */
-- // }
-- case ITEM_Null: // fall through
--
-- // UninitializedThis_variable_info {
-- // u1 tag = ITEM_UninitializedThis; /* 6 */
-- // }
-- case ITEM_UninitializedThis:
-- // nothing more to do for the above tag types
-- break;
--
-- // Object_variable_info {
-- // u1 tag = ITEM_Object; /* 7 */
-- // u2 cpool_index;
-- // }
-- case ITEM_Object:
-- {
-- assert(stackmap_p_ref + 2 <= stackmap_end, "no room for cpool_index");
-- u2 cpool_index = Bytes::get_Java_u2(stackmap_p_ref);
-- u2 new_cp_index = find_new_index(cpool_index);
-- if (new_cp_index != 0) {
-- RC_TRACE_WITH_THREAD(0x04000000, THREAD,
-- ("mapped old cpool_index=%d", cpool_index));
-- Bytes::put_Java_u2(stackmap_p_ref, new_cp_index);
-- cpool_index = new_cp_index;
-- }
-- stackmap_p_ref += 2;
--
-- RC_TRACE_WITH_THREAD(0x04000000, THREAD,
-- ("frame_i=%u, frame_type=%u, cpool_index=%d", frame_i,
-- frame_type, cpool_index));
-- } break;
--
-- // Uninitialized_variable_info {
-- // u1 tag = ITEM_Uninitialized; /* 8 */
-- // u2 offset;
-- // }
-- case ITEM_Uninitialized:
-- assert(stackmap_p_ref + 2 <= stackmap_end, "no room for offset");
-- stackmap_p_ref += 2;
-- break;
--
-- default:
-- RC_TRACE_WITH_THREAD(0x04000000, THREAD,
-- ("frame_i=%u, frame_type=%u, bad tag=0x%x", frame_i, frame_type, tag));
-- ShouldNotReachHere();
-- break;
-- } // end switch (tag)
--} // end rewrite_cp_refs_in_verification_type_info()
--
--
--// Change the constant pool associated with klass scratch_class to
--// scratch_cp. If shrink is true, then scratch_cp_length elements
--// are copied from scratch_cp to a smaller constant pool and the
--// smaller constant pool is associated with scratch_class.
--void VM_RedefineClasses::set_new_constant_pool(
-- instanceKlassHandle scratch_class, constantPoolHandle scratch_cp,
-- int scratch_cp_length, TRAPS) {
-- assert(scratch_cp->length() >= scratch_cp_length, "sanity check");
--
-- // scratch_cp is a merged constant pool and has enough space for a
-- // worst case merge situation. We want to associate the minimum
-- // sized constant pool with the klass to save space.
-- constantPoolHandle smaller_cp(THREAD,
-- oopFactory::new_constantPool(scratch_cp_length,
-- oopDesc::IsUnsafeConc,
-- THREAD));
-- // preserve orig_length() value in the smaller copy
-- int orig_length = scratch_cp->orig_length();
-- assert(orig_length != 0, "sanity check");
-- smaller_cp->set_orig_length(orig_length);
--
-- // attach klass to new constant pool
-- // reference to the cp holder is needed for copy_operands()
-- smaller_cp->set_pool_holder(scratch_class());
--
-- scratch_cp->copy_cp_to(1, scratch_cp_length - 1, smaller_cp, 1, THREAD);
-- scratch_cp = smaller_cp;
-- smaller_cp()->set_is_conc_safe(true);
--
-- // attach new constant pool to klass
-- scratch_class->set_constants(scratch_cp());
--
-- int i; // for portability
--
-- // update each field in klass to use new constant pool indices as needed
-- for (JavaFieldStream fs(scratch_class); !fs.done(); fs.next()) {
-- jshort cur_index = fs.name_index();
-- jshort new_index = find_new_index(cur_index);
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("field-name_index change: %d to %d", cur_index, new_index));
-- fs.set_name_index(new_index);
-- }
-- cur_index = fs.signature_index();
-- new_index = find_new_index(cur_index);
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("field-signature_index change: %d to %d", cur_index, new_index));
-- fs.set_signature_index(new_index);
-- }
-- cur_index = fs.initval_index();
-- new_index = find_new_index(cur_index);
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("field-initval_index change: %d to %d", cur_index, new_index));
-- fs.set_initval_index(new_index);
-- }
-- cur_index = fs.generic_signature_index();
-- new_index = find_new_index(cur_index);
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("field-generic_signature change: %d to %d", cur_index, new_index));
-- fs.set_generic_signature_index(new_index);
-- }
-- } // end for each field
--
-- // Update constant pool indices in the inner classes info to use
-- // new constant indices as needed. The inner classes info is a
-- // quadruple:
-- // (inner_class_info, outer_class_info, inner_name, inner_access_flags)
-- InnerClassesIterator iter(scratch_class);
-- for (; !iter.done(); iter.next()) {
-- int cur_index = iter.inner_class_info_index();
-- if (cur_index == 0) {
-- continue; // JVM spec. allows null inner class refs so skip it
-- }
-- int new_index = find_new_index(cur_index);
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("inner_class_info change: %d to %d", cur_index, new_index));
-- iter.set_inner_class_info_index(new_index);
-- }
-- cur_index = iter.outer_class_info_index();
-- new_index = find_new_index(cur_index);
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("outer_class_info change: %d to %d", cur_index, new_index));
-- iter.set_outer_class_info_index(new_index);
-- }
-- cur_index = iter.inner_name_index();
-- new_index = find_new_index(cur_index);
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("inner_name change: %d to %d", cur_index, new_index));
-- iter.set_inner_name_index(new_index);
-- }
-- } // end for each inner class
--
-- // Attach each method in klass to the new constant pool and update
-- // to use new constant pool indices as needed:
-- objArrayHandle methods(THREAD, scratch_class->methods());
-- for (i = methods->length() - 1; i >= 0; i--) {
-- methodHandle method(THREAD, (methodOop)methods->obj_at(i));
-- method->set_constants(scratch_cp());
--
-- int new_index = find_new_index(method->name_index());
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("method-name_index change: %d to %d", method->name_index(),
-- new_index));
-- method->set_name_index(new_index);
-- }
-- new_index = find_new_index(method->signature_index());
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("method-signature_index change: %d to %d",
-- method->signature_index(), new_index));
-- method->set_signature_index(new_index);
-- }
-- new_index = find_new_index(method->generic_signature_index());
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("method-generic_signature_index change: %d to %d",
-- method->generic_signature_index(), new_index));
-- method->set_generic_signature_index(new_index);
-- }
--
-- // Update constant pool indices in the method's checked exception
-- // table to use new constant indices as needed.
-- int cext_length = method->checked_exceptions_length();
-- if (cext_length > 0) {
-- CheckedExceptionElement * cext_table =
-- method->checked_exceptions_start();
-- for (int j = 0; j < cext_length; j++) {
-- int cur_index = cext_table[j].class_cp_index;
-- int new_index = find_new_index(cur_index);
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("cext-class_cp_index change: %d to %d", cur_index, new_index));
-- cext_table[j].class_cp_index = (u2)new_index;
-- }
-- } // end for each checked exception table entry
-- } // end if there are checked exception table entries
--
-- // Update each catch type index in the method's exception table
-- // to use new constant pool indices as needed. The exception table
-- // holds quadruple entries of the form:
-- // (beg_bci, end_bci, handler_bci, klass_index)
--
-- ExceptionTable ex_table(method());
-- int ext_length = ex_table.length();
--
-- for (int j = 0; j < ext_length; j ++) {
-- int cur_index = ex_table.catch_type_index(j);
-- int new_index = find_new_index(cur_index);
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("ext-klass_index change: %d to %d", cur_index, new_index));
-- ex_table.set_catch_type_index(j, new_index);
-- }
-- } // end for each exception table entry
--
-- // Update constant pool indices in the method's local variable
-- // table to use new constant indices as needed. The local variable
-- // table hold sextuple entries of the form:
-- // (start_pc, length, name_index, descriptor_index, signature_index, slot)
-- int lvt_length = method->localvariable_table_length();
-- if (lvt_length > 0) {
-- LocalVariableTableElement * lv_table =
-- method->localvariable_table_start();
-- for (int j = 0; j < lvt_length; j++) {
-- int cur_index = lv_table[j].name_cp_index;
-- int new_index = find_new_index(cur_index);
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("lvt-name_cp_index change: %d to %d", cur_index, new_index));
-- lv_table[j].name_cp_index = (u2)new_index;
-- }
-- cur_index = lv_table[j].descriptor_cp_index;
-- new_index = find_new_index(cur_index);
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("lvt-descriptor_cp_index change: %d to %d", cur_index,
-- new_index));
-- lv_table[j].descriptor_cp_index = (u2)new_index;
-- }
-- cur_index = lv_table[j].signature_cp_index;
-- new_index = find_new_index(cur_index);
-- if (new_index != 0) {
-- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
-- ("lvt-signature_cp_index change: %d to %d", cur_index, new_index));
-- lv_table[j].signature_cp_index = (u2)new_index;
-- }
-- } // end for each local variable table entry
-- } // end if there are local variable table entries
--
-- rewrite_cp_refs_in_stack_map_table(method, THREAD);
-- } // end for each method
-- assert(scratch_cp()->is_conc_safe(), "Just checking");
--} // end set_new_constant_pool()
--
--
--// Unevolving classes may point to methods of the_class directly
--// from their constant pool caches, itables, and/or vtables. We
--// use the SystemDictionary::classes_do() facility and this helper
--// to fix up these pointers.
--//
--// Note: We currently don't support updating the vtable in
--// arrayKlassOops. See Open Issues in jvmtiRedefineClasses.hpp.
--void VM_RedefineClasses::adjust_cpool_cache_and_vtable(klassOop k_oop,
-- oop initiating_loader, TRAPS) {
-- Klass *k = k_oop->klass_part();
-- if (k->oop_is_instance()) {
-- HandleMark hm(THREAD);
-- instanceKlass *ik = (instanceKlass *) k;
--
-- // HotSpot specific optimization! HotSpot does not currently
-- // support delegation from the bootstrap class loader to a
-- // user-defined class loader. This means that if the bootstrap
-- // class loader is the initiating class loader, then it will also
-- // be the defining class loader. This also means that classes
-- // loaded by the bootstrap class loader cannot refer to classes
-- // loaded by a user-defined class loader. Note: a user-defined
-- // class loader can delegate to the bootstrap class loader.
-- //
-- // If the current class being redefined has a user-defined class
-- // loader as its defining class loader, then we can skip all
-- // classes loaded by the bootstrap class loader.
-- bool is_user_defined =
-- instanceKlass::cast(_the_class_oop)->class_loader() != NULL;
-- if (is_user_defined && ik->class_loader() == NULL) {
-+ if (!check_type_consistency()) {
-+ // (tw) TODO: Rollback the class redefinition
-+ rollback();
-+ RC_TRACE(0x00000001, ("Detected type inconsistency!"));
-+ _result = JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED;
-+ RC_TIMER_STOP(_timer_check_type);
- return;
- }
-
-- // This is a very busy routine. We don't want too much tracing
-- // printed out.
-- bool trace_name_printed = false;
-+ RC_TIMER_STOP(_timer_check_type);
-
-- // Very noisy: only enable this call if you are trying to determine
-- // that a specific class gets found by this routine.
-- // RC_TRACE macro has an embedded ResourceMark
-- // RC_TRACE_WITH_THREAD(0x00100000, THREAD,
-- // ("adjust check: name=%s", ik->external_name()));
-- // trace_name_printed = true;
-+ } else {
-+ RC_TRACE(0x00000001, ("No type narrowing => skipping check for type inconsistency"));
-+ }
-
-- // Fix the vtable embedded in the_class and subclasses of the_class,
-- // if one exists. We discard scratch_class and we don't keep an
-- // instanceKlass around to hold obsolete methods so we don't have
-- // any other instanceKlass embedded vtables to update. The vtable
-- // holds the methodOops for virtual (but not final) methods.
-- if (ik->vtable_length() > 0 && ik->is_subtype_of(_the_class_oop)) {
-- // ik->vtable() creates a wrapper object; rm cleans it up
-- ResourceMark rm(THREAD);
-- ik->vtable()->adjust_method_entries(_matching_old_methods,
-- _matching_new_methods,
-- _matching_methods_length,
-- &trace_name_printed);
-+ if (UseMethodForwardPoints) {
-+ RC_TRACE(0x00000001, ("Check stack for forwarding methods to new version"));
-+ method_forwarding();
-+ }
-+
-+ if (UseSharedSpaces) {
-+ // Sharing is enabled so we remap the shared readonly space to
-+ // shared readwrite, private just in case we need to redefine
-+ // a shared class. We do the remap during the doit() phase of
-+ // the safepoint to be safer.
-+ if (!CompactingPermGenGen::remap_shared_readonly_as_readwrite()) {
-+ RC_TRACE(0x00000001, ("failed to remap shared readonly space to readwrite, private"));
-+ _result = JVMTI_ERROR_INTERNAL;
-+ return;
-+ }
-+ }
-+
-+ RC_TIMER_START(_timer_prepare_redefinition);
-+ for (int i = 0; i < _new_classes->length(); i++) {
-+ redefine_single_class(_new_classes->at(i), thread);
-+ }
-+
-+ // Deoptimize all compiled code that depends on this class
-+ flush_dependent_code(instanceKlassHandle(Thread::current(), (klassOop)NULL), Thread::current());
-+
-+ // Adjust constantpool caches and vtables for all classes
-+ // that reference methods of the evolved class.
-+ SystemDictionary::classes_do(adjust_cpool_cache, Thread::current());
-+
-+ RC_TIMER_STOP(_timer_prepare_redefinition);
-+ RC_TIMER_START(_timer_redefinition);
-+
-+ class ChangePointersOopClosure : public OopClosure {
-+ virtual void do_oop(oop* o) {
-+ do_oop_work(o);
-+ }
-+
-+ virtual void do_oop(narrowOop* o) {
-+ do_oop_work(o);
-+ }
-+ };
-+
-+ class ChangePointersObjectClosure : public ObjectClosure {
-+
-+ private:
-+
-+ OopClosure *_closure;
-+ bool _needs_instance_update;
-+ GrowableArray<oop> *_updated_oops;
-+
-+ public:
-+ ChangePointersObjectClosure(OopClosure *closure) : _closure(closure), _needs_instance_update(false), _updated_oops(NULL) {}
-+
-+ bool needs_instance_update() {
-+ return _needs_instance_update;
-+ }
-+
-+ GrowableArray<oop> *updated_oops() { return _updated_oops; }
-+
-+ virtual void do_object(oop obj) {
-+ if (!obj->is_instanceKlass()) {
-+ obj->oop_iterate(_closure);
-+
-+ if (obj->blueprint()->is_redefining()) {
-+
-+ if (obj->blueprint()->check_redefinition_flag(Klass::HasInstanceTransformer)) {
-+ if (_updated_oops == NULL) {
-+ _updated_oops = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(100, true);
-+ }
-+ _updated_oops->append(obj);
-+ }
-+
-+ if(obj->blueprint()->update_information() != NULL || obj->is_perm()) {
-+
-+ assert(obj->blueprint()->old_version() != NULL, "must have old version");
-+ obj->set_klass_no_check(obj->blueprint()->old_version());
-+
-+ if (obj->size() != obj->size_given_klass(obj->blueprint()->new_version()->klass_part()) || obj->is_perm()) {
-+ // We need an instance update => set back to old klass
-+ _needs_instance_update = true;
-+
-+ } else {
-+ MarkSweep::update_fields(obj, obj);
-+ assert(obj->blueprint()->is_redefining(), "update fields resets the klass");
-+ }
-+ }
-+ }
-+
-+ } else {
-+ instanceKlass *klass = instanceKlass::cast((klassOop)obj);
-+ if (klass->is_redefining()) {
-+ // DCEVM: We need to restorte constants pool owner which was updated by do_oop_work
-+ instanceKlass* old_klass = instanceKlass::cast(klass->old_version());
-+ old_klass->constants()->set_pool_holder(klass->old_version());
-+
-+ // Initialize the new class! Special static initialization that does not execute the
-+ // static constructor but copies static field values from the old class if name
-+ // and signature of a static field match.
-+ klass->initialize_redefined_class();
-+ }
-+ // idubrov: FIXME: we probably don't need that since oop's will be visited in a regular way...
-+ // idubrov: need to check if there is a test to verify that fields referencing class being updated
-+ // idubrov: will get new version of that class
-+ //klass->iterate_static_fields(_closure);
-+ }
-+ }
-+ };
-+
-+ ChangePointersOopClosure oopClosure;
-+ ChangePointersObjectClosure objectClosure(&oopClosure);
-+
-+ {
-+ SharedHeap::heap()->gc_prologue(true);
-+ Universe::root_oops_do(&oopClosure);
-+ Universe::heap()->object_iterate(&objectClosure);
-+ SharedHeap::heap()->gc_epilogue(false);
- }
-
-- // If the current class has an itable and we are either redefining an
-- // interface or if the current class is a subclass of the_class, then
-- // we potentially have to fix the itable. If we are redefining an
-- // interface, then we have to call adjust_method_entries() for
-- // every instanceKlass that has an itable since there isn't a
-- // subclass relationship between an interface and an instanceKlass.
-- if (ik->itable_length() > 0 && (Klass::cast(_the_class_oop)->is_interface()
-- || ik->is_subclass_of(_the_class_oop))) {
-- // ik->itable() creates a wrapper object; rm cleans it up
-- ResourceMark rm(THREAD);
-- ik->itable()->adjust_method_entries(_matching_old_methods,
-- _matching_new_methods,
-- _matching_methods_length,
-- &trace_name_printed);
-+ // Swap marks to have same hashcodes
-+ for (int i=0; i<_new_classes->length(); i++) {
-+ swap_marks(_new_classes->at(i)(), _new_classes->at(i)->old_version());
-+ swap_marks(_new_classes->at(i)->java_mirror(), _new_classes->at(i)->old_version()->java_mirror());
- }
-
-- // The constant pools in other classes (other_cp) can refer to
-- // methods in the_class. We have to update method information in
-- // other_cp's cache. If other_cp has a previous version, then we
-- // have to repeat the process for each previous version. The
-- // constant pool cache holds the methodOops for non-virtual
-- // methods and for virtual, final methods.
-- //
-- // Special case: if the current class is the_class, then new_cp
-- // has already been attached to the_class and old_cp has already
-- // been added as a previous version. The new_cp doesn't have any
-- // cached references to old methods so it doesn't need to be
-- // updated. We can simply start with the previous version(s) in
-- // that case.
-- constantPoolHandle other_cp;
-- constantPoolCacheOop cp_cache;
-+ _updated_oops = objectClosure.updated_oops();
-
-- if (k_oop != _the_class_oop) {
-- // this klass' constant pool cache may need adjustment
-- other_cp = constantPoolHandle(ik->constants());
-- cp_cache = other_cp->cache();
-- if (cp_cache != NULL) {
-- cp_cache->adjust_method_entries(_matching_old_methods,
-- _matching_new_methods,
-- _matching_methods_length,
-- &trace_name_printed);
-+ if (objectClosure.needs_instance_update()){
-+
-+ // Do a full garbage collection to update the instance sizes accordingly
-+ RC_TRACE(0x00000001, ("Before performing full GC!"));
-+ Universe::set_redefining_gc_run(true);
-+ JvmtiGCMarker jgcm;
-+ notify_gc_begin(true);
-+ Universe::heap()->collect_as_vm_thread(GCCause::_heap_inspection);
-+ notify_gc_end();
-+ Universe::set_redefining_gc_run(false);
-+ RC_TRACE(0x00000001, ("GC done!"));
-+ }
-+
-+
-+ if (RC_TRACE_ENABLED(0x00000001)) {
-+ if (_updated_oops != NULL) {
-+ RC_TRACE(0x00000001, ("%d object(s) updated!", _updated_oops->length()));
-+ } else {
-+ RC_TRACE(0x00000001, ("No objects updated!"));
-+ }
-+ }
-+
-+ // Unmark klassOops as "redefining"
-+ for (int i=0; i<_new_classes->length(); i++) {
-+ klassOop cur = _new_classes->at(i)();
-+ _new_classes->at(i)->set_redefining(false);
-+ _new_classes->at(i)->clear_update_information();
-+ _new_classes->at(i)->update_supers_to_newest_version();
-+
-+ if (((instanceKlass *)cur->klass_part()->old_version()->klass_part())->array_klasses() != NULL) {
-+ update_array_classes_to_newest_version(((instanceKlass *)cur->klass_part()->old_version()->klass_part())->array_klasses());
-+
-+ // Transfer the array classes, otherwise we might get cast exceptions when casting array types.
-+ ((instanceKlass*)cur->klass_part())->set_array_klasses(((instanceKlass*)cur->klass_part()->old_version()->klass_part())->array_klasses());
-+
-+ oop new_mirror = _new_classes->at(i)->java_mirror();
-+ oop old_mirror = _new_classes->at(i)->old_version()->java_mirror();
-+ java_lang_Class::set_array_klass(new_mirror, java_lang_Class::array_klass(old_mirror));
-+ }
-+ }
-+
-+ for (int i=T_BOOLEAN; i<=T_LONG; i++) {
-+ update_array_classes_to_newest_version(Universe::typeArrayKlassObj((BasicType)i));
-+ }
-+
-+ // Disable any dependent concurrent compilations
-+ SystemDictionary::notice_modification();
-+
-+ // Set flag indicating that some invariants are no longer true.
-+ // See jvmtiExport.hpp for detailed explanation.
-+ JvmtiExport::set_has_redefined_a_class();
-+
-+ // Clean up caches in the compiler interface and compiler threads
-+ CompileBroker::cleanup_after_redefinition();
-+
-+#ifdef ASSERT
-+
-+ // Universe::verify();
-+ // JNIHandles::verify();
-+
-+ SystemDictionary::classes_do(check_class, thread);
-+#endif
-+
-+ update_active_methods();
-+ RC_TIMER_STOP(_timer_redefinition);
-+
-+}
-+
-+void VM_RedefineClasses::update_array_classes_to_newest_version(klassOop smallest_dimension) {
-+
-+ arrayKlass *curArrayKlass = arrayKlass::cast(smallest_dimension);
-+ assert(curArrayKlass->lower_dimension() == NULL, "argument must be smallest dimension");
-+
-+
-+ while (curArrayKlass != NULL) {
-+ klassOop higher_dimension = curArrayKlass->higher_dimension();
-+ klassOop lower_dimension = curArrayKlass->lower_dimension();
-+ curArrayKlass->update_supers_to_newest_version();
-+
-+ curArrayKlass = NULL;
-+ if (higher_dimension != NULL) {
-+ curArrayKlass = arrayKlass::cast(higher_dimension);
-+ }
-+ }
-+
-+}
-+
-+void VM_RedefineClasses::doit_epilogue() {
-+
-+ RC_TIMER_START(_timer_vm_op_epilogue);
-+
-+ unlock_threads();
-+
-+ ResourceMark mark;
-+
-+ VM_GC_Operation::doit_epilogue();
-+ RC_TRACE(0x00000001, ("GC Operation epilogue finished! "));
-+
-+ GrowableArray<methodHandle> instanceTransformerMethods;
-+
-+ // Call static transformers
-+ for (int i=0; i<_new_classes->length(); i++) {
-+
-+ instanceKlassHandle klass = _new_classes->at(i);
-+
-+ // Transfer init state
-+ if (klass->old_version() != NULL) {
-+ instanceKlass::ClassState state = instanceKlass::cast(klass->old_version())->init_state();
-+ if (state > instanceKlass::linked) {
-+ klass->initialize(Thread::current());
- }
- }
-- {
-- ResourceMark rm(THREAD);
-- // PreviousVersionInfo objects returned via PreviousVersionWalker
-- // contain a GrowableArray of handles. We have to clean up the
-- // GrowableArray _after_ the PreviousVersionWalker destructor
-- // has destroyed the handles.
-- {
-- // the previous versions' constant pool caches may need adjustment
-- PreviousVersionWalker pvw(ik);
-- for (PreviousVersionInfo * pv_info = pvw.next_previous_version();
-- pv_info != NULL; pv_info = pvw.next_previous_version()) {
-- other_cp = pv_info->prev_constant_pool_handle();
-- cp_cache = other_cp->cache();
-- if (cp_cache != NULL) {
-- cp_cache->adjust_method_entries(_matching_old_methods,
-- _matching_new_methods,
-- _matching_methods_length,
-- &trace_name_printed);
-- }
-+
-+ // Find instance transformer method
-+
-+ if (klass->check_redefinition_flag(Klass::HasInstanceTransformer)) {
-+
-+ RC_TRACE(0x00008000, ("Call instance transformer of %s instance", klass->name()->as_C_string()));
-+ klassOop cur_klass = klass();
-+ while (cur_klass != NULL) {
-+ methodOop method = ((instanceKlass*)cur_klass->klass_part())->find_method(vmSymbols::transformer_name(), vmSymbols::void_method_signature());
-+ if (method != NULL) {
-+ methodHandle instanceTransformerMethod(method);
-+ instanceTransformerMethods.append(instanceTransformerMethod);
-+ break;
-+ } else {
-+ cur_klass = cur_klass->klass_part()->super();
- }
-- } // pvw is cleaned up
-- } // rm is cleaned up
-+ }
-+ assert(cur_klass != NULL, "must have instance transformer method");
-+ } else {
-+ instanceTransformerMethods.append(methodHandle(Thread::current(), NULL));
-+ }
-+ }
-+
-+
-+ // Call instance transformers
-+ if (_updated_oops != NULL) {
-+
-+ for (int i=0; i<_updated_oops->length(); i++) {
-+ assert(_updated_oops->at(i) != NULL, "must not be null!");
-+ Handle cur(_updated_oops->at(i));
-+ instanceKlassHandle klass(cur->klass());
-+
-+ if (klass->check_redefinition_flag(Klass::HasInstanceTransformer)) {
-+
-+ methodHandle method = instanceTransformerMethods.at(klass->redefinition_index());
-+
-+ RC_TRACE(0x00008000, ("executing transformer method"));
-+
-+ Thread *__the_thread__ = Thread::current();
-+ JavaValue result(T_VOID);
-+ JavaCallArguments args(cur);
-+ JavaCalls::call(&result,
-+ method,
-+ &args,
-+ THREAD);
-+
-+ // TODO: What to do with an exception here?
-+ if (HAS_PENDING_EXCEPTION) {
-+ Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
-+ RC_TRACE(0x00000002, ("exception when executing transformer: '%s'",
-+ ex_name->as_C_string()));
-+ CLEAR_PENDING_EXCEPTION;
-+ }
-+ }
-+ }
-+
-+ delete _updated_oops;
-+ _updated_oops = NULL;
-+ }
-+
-+ // Free the array of scratch classes
-+ delete _new_classes;
-+ _new_classes = NULL;
-+ RC_TRACE(0x00000001, ("Redefinition finished!"));
-+
-+ RC_TIMER_STOP(_timer_vm_op_epilogue);
-+}
-+
-+bool VM_RedefineClasses::is_modifiable_class(oop klass_mirror) {
-+ // classes for primitives cannot be redefined
-+ if (java_lang_Class::is_primitive(klass_mirror)) {
-+ return false;
-+ }
-+ klassOop the_class_oop = java_lang_Class::as_klassOop(klass_mirror);
-+ // classes for arrays cannot be redefined
-+ if (the_class_oop == NULL || !Klass::cast(the_class_oop)->oop_is_instance()) {
-+ return false;
-+ }
-+ return true;
-+}
-+
-+#ifdef ASSERT
-+
-+void VM_RedefineClasses::verify_classes(klassOop k_oop_latest, oop initiating_loader, TRAPS) {
-+ klassOop k_oop = k_oop_latest;
-+ while (k_oop != NULL) {
-+
-+ instanceKlassHandle k_handle(THREAD, k_oop);
-+ Verifier::verify(k_handle, Verifier::ThrowException, true, true, THREAD);
-+ k_oop = k_oop->klass_part()->old_version();
-+ }
-+}
-+
-+#endif
-+
-+// Rewrite faster byte-codes back to their slower equivalent. Undoes rewriting happening in templateTable_xxx.cpp
-+// The reason is that once we zero cpool caches, we need to re-resolve all entries again. Faster bytecodes do not
-+// do that, they assume that cache entry is resolved already.
-+static void unpatch_bytecode(methodOop method) {
-+ RawBytecodeStream bcs(method);
-+ Bytecodes::Code code;
-+ Bytecodes::Code java_code;
-+ while (!bcs.is_last_bytecode()) {
-+ code = bcs.raw_next();
-+ address bcp = bcs.bcp();
-+
-+ if (code == Bytecodes::_breakpoint) {
-+ int bci = method->bci_from(bcp);
-+ code = method->orig_bytecode_at(bci);
-+ java_code = Bytecodes::java_code(code);
-+ if (code != java_code &&
-+ (java_code == Bytecodes::_getfield ||
-+ java_code == Bytecodes::_putfield ||
-+ java_code == Bytecodes::_aload_0)) {
-+ // Let breakpoint table handling unpatch bytecode
-+ method->set_orig_bytecode_at(bci, java_code);
-+ }
-+ } else {
-+ java_code = Bytecodes::java_code(code);
-+ if (code != java_code &&
-+ (java_code == Bytecodes::_getfield ||
-+ java_code == Bytecodes::_putfield ||
-+ java_code == Bytecodes::_aload_0)) {
-+ *bcp = java_code;
-+ }
-+ }
-+
-+ // Additionally, we need to unpatch bytecode at bcp+1 for fast_xaccess (which would be fast field access)
-+ if (code == Bytecodes::_fast_iaccess_0 || code == Bytecodes::_fast_aaccess_0 || code == Bytecodes::_fast_faccess_0) {
-+ Bytecodes::Code code2 = Bytecodes::code_or_bp_at(bcp + 1);
-+ assert(code2 == Bytecodes::_fast_igetfield ||
-+ code2 == Bytecodes::_fast_agetfield ||
-+ code2 == Bytecodes::_fast_fgetfield, "");
-+ *(bcp + 1) = Bytecodes::java_code(code2);
-+ }
-+ }
-+}
-+
-+// Unevolving classes may point to old methods directly
-+// from their constant pool caches, itables, and/or vtables. We
-+// use the SystemDictionary::classes_do() facility and this helper
-+// to fix up these pointers. Additional field offsets and vtable indices
-+// in the constant pool cache entries are fixed.
-+//
-+// Note: We currently don't support updating the vtable in
-+// arrayKlassOops. See Open Issues in jvmtiRedefineClasses.hpp.
-+void VM_RedefineClasses::adjust_cpool_cache(klassOop k_oop_latest, oop initiating_loader, TRAPS) {
-+ klassOop k_oop = k_oop_latest;
-+ while (k_oop != NULL) {
-+ //tty->print_cr("name=%s", k_oop->klass_part()->name()->as_C_string());
-+/*
-+ methodOop *matching_old_methods = NEW_RESOURCE_ARRAY(methodOop, _old_methods->length());
-+ methodOop *matching_new_methods = NEW_RESOURCE_ARRAY(methodOop, _old_methods->length());
-+
-+ for (int i=0; i<_matching_methods_length; i++) {
-+ matching_old_methods[i] = (methodOop)_old_methods->obj_at(_matching_old_methods[i]);
-+ matching_new_methods[i] = (methodOop)_new_methods->obj_at(_matching_new_methods[i]);
-+ }*/
-+
-+ Klass *k = k_oop->klass_part();
-+ if (k->oop_is_instance()) {
-+ HandleMark hm(THREAD);
-+ instanceKlass *ik = (instanceKlass *) k;
-+
-+ constantPoolHandle other_cp;
-+ constantPoolCacheOop cp_cache;
-+
-+ other_cp = constantPoolHandle(ik->constants());
-+
-+ for (int i=0; i<other_cp->length(); i++) {
-+ if (other_cp->tag_at(i).is_klass()) {
-+ klassOop klass = other_cp->klass_at(i, THREAD);
-+ if (klass->klass_part()->new_version() != NULL) {
-+
-+ // (tw) TODO: check why/if this is necessary
-+ other_cp->klass_at_put(i, klass->klass_part()->new_version());
-+ }
-+ klass = other_cp->klass_at(i, THREAD);
-+ assert(klass->klass_part()->new_version() == NULL, "Must be new klass!");
-+ }
-+ }
-+
-+ cp_cache = other_cp->cache();
-+
-+ if (cp_cache != NULL) {
-+ cp_cache->adjust_entries(NULL,
-+ NULL,
-+ 0);
-+ }
-+
-+ // If bytecode rewriting is enabled, we also need to unpatch bytecode to force resolution of zeroied entries
-+ if (RewriteBytecodes) {
-+ ik->methods_do(unpatch_bytecode);
-+ }
-+ }
-+ k_oop = k_oop->klass_part()->old_version();
- }
- }
-
- void VM_RedefineClasses::update_jmethod_ids() {
- for (int j = 0; j < _matching_methods_length; ++j) {
-- methodOop old_method = _matching_old_methods[j];
-+ methodOop old_method = (methodOop)_old_methods->obj_at(_matching_old_methods[j]);
-+ RC_TRACE(0x00008000, ("matching method %s", old_method->name_and_sig_as_C_string()));
-+
- jmethodID jmid = old_method->find_jmethod_id_or_null();
-+ if (old_method->new_version() != NULL && jmid == NULL) {
-+ // (tw) Have to create jmethodID in this case
-+ jmid = old_method->jmethod_id();
-+ }
-+
- if (jmid != NULL) {
- // There is a jmethodID, change it to point to the new method
-- methodHandle new_method_h(_matching_new_methods[j]);
-+ methodHandle new_method_h((methodOop)_new_methods->obj_at(_matching_new_methods[j]));
-+ if (old_method->new_version() == NULL) {
-+ methodHandle old_method_h((methodOop)_old_methods->obj_at(_matching_old_methods[j]));
-+ jmethodID new_jmethod_id = JNIHandles::make_jmethod_id(old_method_h);
-+ bool result = instanceKlass::cast(old_method_h->method_holder())->update_jmethod_id(old_method_h(), new_jmethod_id);
-+ //RC_TRACE(0x00008000, ("Changed jmethodID for old method assigned to %d / result=%d", new_jmethod_id, result);
-+ //RC_TRACE(0x00008000, ("jmethodID new method: %d jmethodID old method: %d", new_method_h->jmethod_id(), old_method->jmethod_id());
-+ } else {
-+ jmethodID mid = new_method_h->jmethod_id();
-+ bool result = instanceKlass::cast(new_method_h->method_holder())->update_jmethod_id(new_method_h(), jmid);
-+ //RC_TRACE(0x00008000, ("Changed jmethodID for new method assigned to %d / result=%d", jmid, result);
-+
-+ }
- JNIHandles::change_method_associated_with_jmethod_id(jmid, new_method_h);
-- assert(JNIHandles::resolve_jmethod_id(jmid) == _matching_new_methods[j],
-- "should be replaced");
-+ //RC_TRACE(0x00008000, ("changing method associated with jmethod id %d to %s", (int)jmid, new_method_h->name()->as_C_string());
-+ assert(JNIHandles::resolve_jmethod_id(jmid) == (methodOop)_new_methods->obj_at(_matching_new_methods[j]), "should be replaced");
-+ jmethodID mid = ((methodOop)_new_methods->obj_at(_matching_new_methods[j]))->jmethod_id();
-+ assert(JNIHandles::resolve_non_null((jobject)mid) == new_method_h(), "must match!");
-+
-+ //RC_TRACE(0x00008000, ("jmethodID new method: %d jmethodID old method: %d", new_method_h->jmethod_id(), old_method->jmethod_id());
- }
- }
- }
-
--void VM_RedefineClasses::check_methods_and_mark_as_obsolete(
-- BitMap *emcp_methods, int * emcp_method_count_p) {
-- *emcp_method_count_p = 0;
-- int obsolete_count = 0;
-- int old_index = 0;
-- for (int j = 0; j < _matching_methods_length; ++j, ++old_index) {
-- methodOop old_method = _matching_old_methods[j];
-- methodOop new_method = _matching_new_methods[j];
-- methodOop old_array_method;
-
-- // Maintain an old_index into the _old_methods array by skipping
-- // deleted methods
-- while ((old_array_method = (methodOop) _old_methods->obj_at(old_index))
-- != old_method) {
-- ++old_index;
-- }
-+// Deoptimize all compiled code that depends on this class.
-+//
-+// If the can_redefine_classes capability is obtained in the onload
-+// phase then the compiler has recorded all dependencies from startup.
-+// In that case we need only deoptimize and throw away all compiled code
-+// that depends on the class.
-+//
-+// If can_redefine_classes is obtained sometime after the onload
-+// phase then the dependency information may be incomplete. In that case
-+// the first call to RedefineClasses causes all compiled code to be
-+// thrown away. As can_redefine_classes has been obtained then
-+// all future compilations will record dependencies so second and
-+// subsequent calls to RedefineClasses need only throw away code
-+// that depends on the class.
-+//
-+void VM_RedefineClasses::flush_dependent_code(instanceKlassHandle k_h, TRAPS) {
-+ assert_locked_or_safepoint(Compile_lock);
-
-- if (MethodComparator::methods_EMCP(old_method, new_method)) {
-- // The EMCP definition from JSR-163 requires the bytecodes to be
-- // the same with the exception of constant pool indices which may
-- // differ. However, the constants referred to by those indices
-- // must be the same.
-- //
-- // We use methods_EMCP() for comparison since constant pool
-- // merging can remove duplicate constant pool entries that were
-- // present in the old method and removed from the rewritten new
-- // method. A faster binary comparison function would consider the
-- // old and new methods to be different when they are actually
-- // EMCP.
-- //
-- // The old and new methods are EMCP and you would think that we
-- // could get rid of one of them here and now and save some space.
-- // However, the concept of EMCP only considers the bytecodes and
-- // the constant pool entries in the comparison. Other things,
-- // e.g., the line number table (LNT) or the local variable table
-- // (LVT) don't count in the comparison. So the new (and EMCP)
-- // method can have a new LNT that we need so we can't just
-- // overwrite the new method with the old method.
-- //
-- // When this routine is called, we have already attached the new
-- // methods to the_class so the old methods are effectively
-- // overwritten. However, if an old method is still executing,
-- // then the old method cannot be collected until sometime after
-- // the old method call has returned. So the overwriting of old
-- // methods by new methods will save us space except for those
-- // (hopefully few) old methods that are still executing.
-- //
-- // A method refers to a constMethodOop and this presents another
-- // possible avenue to space savings. The constMethodOop in the
-- // new method contains possibly new attributes (LNT, LVT, etc).
-- // At first glance, it seems possible to save space by replacing
-- // the constMethodOop in the old method with the constMethodOop
-- // from the new method. The old and new methods would share the
-- // same constMethodOop and we would save the space occupied by
-- // the old constMethodOop. However, the constMethodOop contains
-- // a back reference to the containing method. Sharing the
-- // constMethodOop between two methods could lead to confusion in
-- // the code that uses the back reference. This would lead to
-- // brittle code that could be broken in non-obvious ways now or
-- // in the future.
-- //
-- // Another possibility is to copy the constMethodOop from the new
-- // method to the old method and then overwrite the new method with
-- // the old method. Since the constMethodOop contains the bytecodes
-- // for the method embedded in the oop, this option would change
-- // the bytecodes out from under any threads executing the old
-- // method and make the thread's bcp invalid. Since EMCP requires
-- // that the bytecodes be the same modulo constant pool indices, it
-- // is straight forward to compute the correct new bcp in the new
-- // constMethodOop from the old bcp in the old constMethodOop. The
-- // time consuming part would be searching all the frames in all
-- // of the threads to find all of the calls to the old method.
-- //
-- // It looks like we will have to live with the limited savings
-- // that we get from effectively overwriting the old methods
-- // when the new methods are attached to the_class.
-+ // All dependencies have been recorded from startup or this is a second or
-+ // subsequent use of RedefineClasses
-
-- // track which methods are EMCP for add_previous_version() call
-- emcp_methods->set_bit(old_index);
-- (*emcp_method_count_p)++;
-+ // For now deopt all
-+ // (tw) TODO: Improve the dependency system such that we can safely deopt only a subset of the methods
-+ if (0 && JvmtiExport::all_dependencies_are_recorded()) {
-+ Universe::flush_evol_dependents_on(k_h);
-+ } else {
-+ CodeCache::mark_all_nmethods_for_deoptimization();
-
-- // An EMCP method is _not_ obsolete. An obsolete method has a
-- // different jmethodID than the current method. An EMCP method
-- // has the same jmethodID as the current method. Having the
-- // same jmethodID for all EMCP versions of a method allows for
-- // a consistent view of the EMCP methods regardless of which
-- // EMCP method you happen to have in hand. For example, a
-- // breakpoint set in one EMCP method will work for all EMCP
-- // versions of the method including the current one.
-- } else {
-- // mark obsolete methods as such
-- old_method->set_is_obsolete();
-- obsolete_count++;
-+ ResourceMark rm(THREAD);
-+ DeoptimizationMarker dm;
-
-- // obsolete methods need a unique idnum
-- u2 num = instanceKlass::cast(_the_class_oop)->next_method_idnum();
-- if (num != constMethodOopDesc::UNSET_IDNUM) {
--// u2 old_num = old_method->method_idnum();
-- old_method->set_method_idnum(num);
--// TO DO: attach obsolete annotations to obsolete method's new idnum
-+ // Deoptimize all activations depending on marked nmethods
-+ Deoptimization::deoptimize_dependents();
-+
-+ // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies)
-+ CodeCache::make_marked_nmethods_not_entrant();
-+
-+ // From now on we know that the dependency information is complete
-+ JvmtiExport::set_all_dependencies_are_recorded(true);
-+ }
-+}
-+
-+void VM_RedefineClasses::compute_added_deleted_matching_methods() {
-+ methodOop old_method;
-+ methodOop new_method;
-+
-+ _matching_old_methods = NEW_RESOURCE_ARRAY(int, _old_methods->length());
-+ _matching_new_methods = NEW_RESOURCE_ARRAY(int, _old_methods->length());
-+ _added_methods = NEW_RESOURCE_ARRAY(int, _new_methods->length());
-+ _deleted_methods = NEW_RESOURCE_ARRAY(int, _old_methods->length());
-+
-+ _matching_methods_length = 0;
-+ _deleted_methods_length = 0;
-+ _added_methods_length = 0;
-+
-+ int nj = 0;
-+ int oj = 0;
-+ while (true) {
-+ if (oj >= _old_methods->length()) {
-+ if (nj >= _new_methods->length()) {
-+ break; // we've looked at everything, done
- }
-+ // New method at the end
-+ new_method = (methodOop) _new_methods->obj_at(nj);
-+ _added_methods[_added_methods_length++] = nj;
-+ ++nj;
-+ } else if (nj >= _new_methods->length()) {
-+ // Old method, at the end, is deleted
-+ old_method = (methodOop) _old_methods->obj_at(oj);
-+ _deleted_methods[_deleted_methods_length++] = oj;
-+ ++oj;
-+ } else {
-+ old_method = (methodOop) _old_methods->obj_at(oj);
-+ new_method = (methodOop) _new_methods->obj_at(nj);
-+ if (old_method->name() == new_method->name()) {
-+ if (old_method->signature() == new_method->signature()) {
-+ _matching_old_methods[_matching_methods_length ] = oj;//old_method;
-+ _matching_new_methods[_matching_methods_length++] = nj;//new_method;
-+ ++nj;
-+ ++oj;
-+ } else {
-+ // added overloaded have already been moved to the end,
-+ // so this is a deleted overloaded method
-+ _deleted_methods[_deleted_methods_length++] = oj;//old_method;
-+ ++oj;
-+ }
-+ } else { // names don't match
-+ if (old_method->name()->fast_compare(new_method->name()) > 0) {
-+ // new method
-+ _added_methods[_added_methods_length++] = nj;//new_method;
-+ ++nj;
-+ } else {
-+ // deleted method
-+ _deleted_methods[_deleted_methods_length++] = oj;//old_method;
-+ ++oj;
-+ }
-+ }
-+ }
-+ }
-+ assert(_matching_methods_length + _deleted_methods_length == _old_methods->length(), "sanity");
-+ assert(_matching_methods_length + _added_methods_length == _new_methods->length(), "sanity");
-+ RC_TRACE(0x00008000, ("Matching methods = %d / deleted methods = %d / added methods = %d",
-+ _matching_methods_length, _deleted_methods_length, _added_methods_length));
-+}
-+
-+
-+
-+// Install the redefinition of a class:
-+// - house keeping (flushing breakpoints and caches, deoptimizing
-+// dependent compiled code)
-+// - adjusting constant pool caches and vtables in other classes
-+void VM_RedefineClasses::redefine_single_class(instanceKlassHandle the_new_class, TRAPS) {
-+
-+ ResourceMark rm(THREAD);
-+
-+ assert(the_new_class->old_version() != NULL, "Must not be null");
-+ assert(the_new_class->old_version()->klass_part()->new_version() == the_new_class(), "Must equal");
-+
-+ instanceKlassHandle the_old_class = instanceKlassHandle(THREAD, the_new_class->old_version());
-+
-+#ifndef JVMTI_KERNEL
-+ // Remove all breakpoints in methods of this class
-+ JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
-+ jvmti_breakpoints.clearall_in_class_at_safepoint(the_old_class());
-+#endif // !JVMTI_KERNEL
-+
-+ if (the_old_class() == Universe::reflect_invoke_cache()->klass()) {
-+ // We are redefining java.lang.reflect.Method. Method.invoke() is
-+ // cached and users of the cache care about each active version of
-+ // the method so we have to track this previous version.
-+ // Do this before methods get switched
-+ Universe::reflect_invoke_cache()->add_previous_version(
-+ the_old_class->method_with_idnum(Universe::reflect_invoke_cache()->method_idnum()));
-+ }
-+
-+ _old_methods = the_old_class->methods();
-+ _new_methods = the_new_class->methods();
-+ _the_class_oop = the_old_class();
-+ compute_added_deleted_matching_methods();
-+
-+ // track which methods are EMCP for add_previous_version() call below
-+
-+ // (tw) TODO: Check if we need the concept of EMCP?
-+ BitMap emcp_methods(_old_methods->length());
-+ int emcp_method_count = 0;
-+ emcp_methods.clear(); // clears 0..(length() - 1)
-+
-+ // We need to mark methods as old!!
-+ check_methods_and_mark_as_obsolete(&emcp_methods, &emcp_method_count);
-+ update_jmethod_ids();
-+
-+ // keep track of previous versions of this class
-+ the_new_class->add_previous_version(the_old_class, &emcp_methods,
-+ emcp_method_count);
-+
-+ // TODO:
-+ transfer_old_native_function_registrations(the_old_class);
-+
-+
-+#ifdef ASSERT
-+
-+// klassOop systemLookup1 = SystemDictionary::resolve_or_null(the_old_class->name(), the_old_class->class_loader(), the_old_class->protection_domain(), THREAD);
-+// assert(systemLookup1 == the_new_class(), "New class must be in system dictionary!");
-+
-+ //JNIHandles::verify();
-+
-+// klassOop systemLookup = SystemDictionary::resolve_or_null(the_old_class->name(), the_old_class->class_loader(), the_old_class->protection_domain(), THREAD);
-+
-+// assert(systemLookup == the_new_class(), "New class must be in system dictionary!");
-+ assert(the_new_class->old_version() != NULL, "Must not be null");
-+ assert(the_new_class->old_version()->klass_part()->new_version() == the_new_class(), "Must equal");
-+
-+ for (int i=0; i<the_new_class->methods()->length(); i++) {
-+ assert(((methodOop)the_new_class->methods()->obj_at(i))->method_holder() == the_new_class(), "method holder must match!");
-+ }
-+
-+ _old_methods->verify();
-+ _new_methods->verify();
-+
-+ the_new_class->vtable()->verify(tty);
-+ the_old_class->vtable()->verify(tty);
-+
-+#endif
-+
-+ // increment the classRedefinedCount field in the_class and in any
-+ // direct and indirect subclasses of the_class
-+ increment_class_counter((instanceKlass *)the_old_class()->klass_part(), THREAD);
-+
-+}
-+
-+
-+void VM_RedefineClasses::check_methods_and_mark_as_obsolete(BitMap *emcp_methods, int * emcp_method_count_p) {
-+ RC_TRACE(0x00008000, ("Checking matching methods for EMCP"));
-+ *emcp_method_count_p = 0;
-+ int obsolete_count = 0;
-+ int old_index = 0;
-+ for (int j = 0; j < _matching_methods_length; ++j, ++old_index) {
-+ methodOop old_method = (methodOop)_old_methods->obj_at(_matching_old_methods[j]);
-+ methodOop new_method = (methodOop)_new_methods->obj_at(_matching_new_methods[j]);
-+ methodOop old_array_method;
-+
-+ // Maintain an old_index into the _old_methods array by skipping
-+ // deleted methods
-+ while ((old_array_method = (methodOop) _old_methods->obj_at(old_index))
-+ != old_method) {
-+ ++old_index;
-+ }
-+
-+ if (MethodComparator::methods_EMCP(old_method, new_method)) {
-+ // The EMCP definition from JSR-163 requires the bytecodes to be
-+ // the same with the exception of constant pool indices which may
-+ // differ. However, the constants referred to by those indices
-+ // must be the same.
-+ //
-+ // We use methods_EMCP() for comparison since constant pool
-+ // merging can remove duplicate constant pool entries that were
-+ // present in the old method and removed from the rewritten new
-+ // method. A faster binary comparison function would consider the
-+ // old and new methods to be different when they are actually
-+ // EMCP.
-+
-+ // track which methods are EMCP for add_previous_version() call
-+ emcp_methods->set_bit(old_index);
-+ (*emcp_method_count_p)++;
-+
-+ // An EMCP method is _not_ obsolete. An obsolete method has a
-+ // different jmethodID than the current method. An EMCP method
-+ // has the same jmethodID as the current method. Having the
-+ // same jmethodID for all EMCP versions of a method allows for
-+ // a consistent view of the EMCP methods regardless of which
-+ // EMCP method you happen to have in hand. For example, a
-+ // breakpoint set in one EMCP method will work for all EMCP
-+ // versions of the method including the current one.
-+
-+ old_method->set_new_version(new_method);
-+ new_method->set_old_version(old_method);
-+
-+ RC_TRACE(0x00008000, ("Found EMCP method %s", old_method->name_and_sig_as_C_string()));
-+
-+ // Transfer breakpoints
-+ instanceKlass *ik = instanceKlass::cast(old_method->method_holder());
-+ for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = bp->next()) {
-+ RC_TRACE(0x00000002, ("Checking breakpoint"));
-+ RC_TRACE(0x00000002, ("%d / %d",
-+ bp->match(old_method), bp->match(new_method)));
-+ if (bp->match(old_method)) {
-+ assert(bp->match(new_method), "if old method is method, then new method must match too");
-+ RC_TRACE(0x00000002, ("Found a breakpoint in an old EMCP method"));
-+ new_method->set_breakpoint(bp->bci());
-+ }
-+ }
-+
-+
-+
-+ } else {
-+ // mark obsolete methods as such
-+ old_method->set_is_obsolete();
-+ obsolete_count++;
-+
-+ // With tracing we try not to "yack" too much. The position of
-+ // this trace assumes there are fewer obsolete methods than
-+ // EMCP methods.
-+ RC_TRACE(0x00008000, ("mark %s(%s) as obsolete",
-+ old_method->name()->as_C_string(),
-+ old_method->signature()->as_C_string()));
-+ }
-+ old_method->set_is_old();
-+ }
-+ for (int i = 0; i < _deleted_methods_length; ++i) {
-+ methodOop old_method = (methodOop)_old_methods->obj_at(_deleted_methods[i]);
-+
-+ //assert(old_method->vtable_index() < 0,
-+ // "cannot delete methods with vtable entries");;
-+
-+ // Mark all deleted methods as old and obsolete
-+ old_method->set_is_old();
-+ old_method->set_is_obsolete();
-+ ++obsolete_count;
- // With tracing we try not to "yack" too much. The position of
- // this trace assumes there are fewer obsolete methods than
- // EMCP methods.
-- RC_TRACE(0x00000100, ("mark %s(%s) as obsolete",
-+ RC_TRACE(0x00008000, ("mark deleted %s(%s) as obsolete",
- old_method->name()->as_C_string(),
- old_method->signature()->as_C_string()));
- }
-- old_method->set_is_old();
-- }
-- for (int i = 0; i < _deleted_methods_length; ++i) {
-- methodOop old_method = _deleted_methods[i];
--
-- assert(old_method->vtable_index() < 0,
-- "cannot delete methods with vtable entries");;
--
-- // Mark all deleted methods as old and obsolete
-- old_method->set_is_old();
-- old_method->set_is_obsolete();
-- ++obsolete_count;
-- // With tracing we try not to "yack" too much. The position of
-- // this trace assumes there are fewer obsolete methods than
-- // EMCP methods.
-- RC_TRACE(0x00000100, ("mark deleted %s(%s) as obsolete",
-- old_method->name()->as_C_string(),
-- old_method->signature()->as_C_string()));
-- }
-- assert((*emcp_method_count_p + obsolete_count) == _old_methods->length(),
-- "sanity check");
-- RC_TRACE(0x00000100, ("EMCP_cnt=%d, obsolete_cnt=%d", *emcp_method_count_p,
-- obsolete_count));
-+ //assert((*emcp_method_count_p + obsolete_count) == _old_methods->length(), "sanity check");
-+ RC_TRACE(0x00008000, ("EMCP_cnt=%d, obsolete_cnt=%d !", *emcp_method_count_p, obsolete_count));
- }
-+
-+// Increment the classRedefinedCount field in the specific instanceKlass
-+// and in all direct and indirect subclasses.
-+void VM_RedefineClasses::increment_class_counter(instanceKlass *ik, TRAPS) {
-+ oop class_mirror = ik->java_mirror();
-+ klassOop class_oop = java_lang_Class::as_klassOop(class_mirror);
-+ int new_count = java_lang_Class::classRedefinedCount(class_mirror) + 1;
-+ java_lang_Class::set_classRedefinedCount(class_mirror, new_count);
-+ RC_TRACE(0x00008000, ("updated count for class=%s to %d", ik->external_name(), new_count));
-+}
-+
-+#ifndef PRODUCT
-+void VM_RedefineClasses::check_class(klassOop k_oop, TRAPS) {
-+ Klass *k = k_oop->klass_part();
-+ if (k->oop_is_instance()) {
-+ HandleMark hm(THREAD);
-+ instanceKlass *ik = (instanceKlass *) k;
-+ assert(ik->is_newest_version(), "must be latest version in system dictionary");
-+
-+ if (ik->vtable_length() > 0) {
-+ ResourceMark rm(THREAD);
-+ if (!ik->vtable()->check_no_old_entries()) {
-+ RC_TRACE(0x00000001, ("size of class: %d\n",
-+ k_oop->size()));
-+ RC_TRACE(0x00000001, ("klassVtable::check_no_old_entries failure -- OLD method found -- class: %s",
-+ ik->signature_name()));
-+ assert(false, "OLD method found");
-+ }
-+
-+ ik->vtable()->verify(tty, true);
-+ }
-+ }
-+}
-+
-+#endif
-+
-+VM_RedefineClasses::FindAffectedKlassesClosure::FindAffectedKlassesClosure( GrowableArray<instanceKlassHandle> *original_klasses, GrowableArray<instanceKlassHandle> *result )
-+{
-+ assert(original_klasses != NULL && result != NULL, "");
-+ this->_original_klasses = original_klasses;
-+ this->_result = result;
-+ SystemDictionary::classes_do(this);
-+}
-+
-+void VM_RedefineClasses::FindAffectedKlassesClosure::do_object( oop obj )
-+{
-+ klassOop klass = (klassOop)obj;
-+ assert(!_result->contains(klass), "must not occur more than once!");
-+ assert(klass->klass_part()->new_version() == NULL, "Only last version is valid entry in system dictionary");
-+
-+ for(int i=0; i<_original_klasses->length(); i++) {
-+ instanceKlassHandle cur = _original_klasses->at(i);
-+ if (cur() != klass && klass->klass_part()->is_subtype_of(cur()) && !_original_klasses->contains(klass)) {
-+ RC_TRACE(0x00008000, ("Found affected class: %s", klass->klass_part()->name()->as_C_string()));
-+ _result->append(klass);
-+ break;
-+ }
-+ }
-+}
-+
-+jvmtiError VM_RedefineClasses::do_topological_class_sorting( const jvmtiClassDefinition *class_defs, int class_count, GrowableArray<instanceKlassHandle> *affected, GrowableArray<instanceKlassHandle> *arr, TRAPS)
-+{
-+ GrowableArray< Pair<klassOop, klassOop> > *links = new GrowableArray< Pair<klassOop, klassOop> >();
-+
-+ for (int i=0; i<class_count; i++) {
-+
-+ oop mirror = JNIHandles::resolve_non_null(class_defs[i].klass);
-+ klassOop the_class_oop = java_lang_Class::as_klassOop(mirror);
-+ instanceKlassHandle the_class(THREAD, the_class_oop);
-+ Handle the_class_loader(THREAD, the_class->class_loader());
-+ Handle protection_domain(THREAD, the_class->protection_domain());
-+
-+ ClassFileStream st((u1*) class_defs[i].class_bytes,
-+ class_defs[i].class_byte_count, (char *)"__VM_RedefineClasses__");
-+ ClassFileParser cfp(&st);
-+
-+ GrowableArray<Symbol*> symbolArr;
-+ RC_TRACE(0x00000002, ("Before find super symbols of class %s",
-+ the_class->name()->as_C_string()));
-+ cfp.findSuperSymbols(the_class->name(), the_class_loader, protection_domain, the_class, symbolArr, THREAD);
-+
-+ for (int j=0; j<symbolArr.length(); j++) {
-+ Symbol* sym = symbolArr.at(j);
-+
-+ RC_TRACE(0x00008000, ("Before adding link to super class %s", sym->as_C_string()));
-+
-+ for (int k=0; k<arr->length(); k++) {
-+ klassOop curOop = arr->at(k)();
-+ // (tw) TODO: Check if we get aliasing problems with different class loaders?
-+ if (curOop->klass_part()->name() == sym /*&& curOop->klass_part()->class_loader() == the_class_loader()*/) {
-+ RC_TRACE(0x00000002, ("Found class to link"));
-+ links->append(Pair<klassOop, klassOop>(curOop, the_class()));
-+ break;
-+ }
-+ }
-+ }
-+ }
-+
-+
-+ RC_TRACE(0x00000001, ("Identified links between classes! "));
-+
-+ for (int i=0; i<affected->length(); i++) {
-+
-+ instanceKlassHandle klass = affected->at(i);
-+
-+ klassOop superKlass = klass->super();
-+ if (affected->contains(superKlass)) {
-+ links->append(Pair<klassOop, klassOop>(superKlass, klass()));
-+ }
-+
-+ objArrayOop superInterfaces = klass->local_interfaces();
-+ for (int j=0; j<superInterfaces->length(); j++) {
-+ klassOop interfaceKlass = (klassOop)superInterfaces->obj_at(j);
-+ if (arr->contains(interfaceKlass)) {
-+ links->append(Pair<klassOop, klassOop>(interfaceKlass, klass()));
-+ }
-+ }
-+ }
-+
-+ if (RC_TRACE_ENABLED(0x00000002)) {
-+ RC_TRACE(0x00000002, ("Identified links: "));
-+ for (int i=0; i<links->length(); i++) {
-+ RC_TRACE(0x00000002, ("%s to %s",
-+ links->at(i).left()->klass_part()->name()->as_C_string(),
-+ links->at(i).right()->klass_part()->name()->as_C_string()));
-+ }
-+ }
-+
-+ for (int i=0; i<arr->length(); i++) {
-+
-+ int j;
-+ for (j=i; j<arr->length(); j++) {
-+
-+ int k;
-+ for (k=0; k<links->length(); k++) {
-+
-+ klassOop k1 = links->adr_at(k)->right();
-+ klassOop k2 = arr->at(j)();
-+ if (k1 == k2) {
-+ break;
-+ }
-+ }
-+
-+ if (k == links->length()) {
-+ break;
-+ }
-+ }
-+
-+ if (j == arr->length()) {
-+ // circle detected
-+ return JVMTI_ERROR_CIRCULAR_CLASS_DEFINITION;
-+ }
-+
-+ for (int k=0; k<links->length(); k++) {
-+ if (links->adr_at(k)->left() == arr->at(j)()) {
-+ links->at_put(k, links->at(links->length() - 1));
-+ links->remove_at(links->length() - 1);
-+ k--;
-+ }
-+ }
-+
-+ instanceKlassHandle tmp = arr->at(j);
-+ arr->at_put(j, arr->at(i));
-+ arr->at_put(i, tmp);
-+ }
-+
-+ return JVMTI_ERROR_NONE;
-+}
-+
-+void VM_RedefineClasses::oops_do(OopClosure *closure) {
-+
-+ if (_updated_oops != NULL) {
-+ for (int i=0; i<_updated_oops->length(); i++) {
-+ closure->do_oop(_updated_oops->adr_at(i));
-+ }
-+ }
-+}
-+
-+void VM_RedefineClasses::transfer_special_access_flags(fieldDescriptor *from, fieldDescriptor *to) {
-+ to->set_is_field_modification_watched(from->is_field_modification_watched());
-+ to->set_is_field_access_watched(from->is_field_access_watched());
-+ if (from->is_field_modification_watched() || from->is_field_access_watched()) {
-+ RC_TRACE(0x00000002, ("Transferred watch for field %s",
-+ from->name()->as_C_string()));
-+ }
-+ update_klass_field_access_flag(to);
-+}
-+
-+void VM_RedefineClasses::update_klass_field_access_flag(fieldDescriptor *fd) {
-+ instanceKlass* ik = instanceKlass::cast(fd->field_holder());
-+ FieldInfo* fi = FieldInfo::from_field_array(ik->fields(), fd->index());
-+ fi->set_access_flags(fd->access_flags().as_short());
-+}
-+
-
- // This internal class transfers the native function registration from old methods
- // to new methods. It is designed to handle both the simple case of unchanged
-@@ -2969,7 +3161,7 @@
- // Same, caused by prefix removal only 3_2_1_m -> 3_2_m
- //
- class TransferNativeFunctionRegistration {
-- private:
-+private:
- instanceKlassHandle the_class;
- int prefix_count;
- char** prefixes;
-@@ -2982,42 +3174,42 @@
- // (2) with the prefix.
- // where 'prefix' is the prefix at that 'depth' (first prefix, second prefix,...)
- methodOop search_prefix_name_space(int depth, char* name_str, size_t name_len,
-- Symbol* signature) {
-- TempNewSymbol name_symbol = SymbolTable::probe(name_str, (int)name_len);
-- if (name_symbol != NULL) {
-- methodOop method = Klass::cast(the_class())->lookup_method(name_symbol, signature);
-- if (method != NULL) {
-- // Even if prefixed, intermediate methods must exist.
-- if (method->is_native()) {
-- // Wahoo, we found a (possibly prefixed) version of the method, return it.
-- return method;
-- }
-- if (depth < prefix_count) {
-- // Try applying further prefixes (other than this one).
-- method = search_prefix_name_space(depth+1, name_str, name_len, signature);
-- if (method != NULL) {
-- return method; // found
-+ Symbol* signature) {
-+ Symbol* name_symbol = SymbolTable::probe(name_str, (int)name_len);
-+ if (name_symbol != NULL) {
-+ methodOop method = Klass::cast(the_class()->klass_part()->new_version())->lookup_method(name_symbol, signature);
-+ if (method != NULL) {
-+ // Even if prefixed, intermediate methods must exist.
-+ if (method->is_native()) {
-+ // Wahoo, we found a (possibly prefixed) version of the method, return it.
-+ return method;
- }
-+ if (depth < prefix_count) {
-+ // Try applying further prefixes (other than this one).
-+ method = search_prefix_name_space(depth+1, name_str, name_len, signature);
-+ if (method != NULL) {
-+ return method; // found
-+ }
-
-- // Try adding this prefix to the method name and see if it matches
-- // another method name.
-- char* prefix = prefixes[depth];
-- size_t prefix_len = strlen(prefix);
-- size_t trial_len = name_len + prefix_len;
-- char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
-- strcpy(trial_name_str, prefix);
-- strcat(trial_name_str, name_str);
-- method = search_prefix_name_space(depth+1, trial_name_str, trial_len,
-- signature);
-- if (method != NULL) {
-- // If found along this branch, it was prefixed, mark as such
-- method->set_is_prefixed_native();
-- return method; // found
-+ // Try adding this prefix to the method name and see if it matches
-+ // another method name.
-+ char* prefix = prefixes[depth];
-+ size_t prefix_len = strlen(prefix);
-+ size_t trial_len = name_len + prefix_len;
-+ char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
-+ strcpy(trial_name_str, prefix);
-+ strcat(trial_name_str, name_str);
-+ method = search_prefix_name_space(depth+1, trial_name_str, trial_len,
-+ signature);
-+ if (method != NULL) {
-+ // If found along this branch, it was prefixed, mark as such
-+ method->set_is_prefixed_native();
-+ return method; // found
-+ }
- }
- }
- }
-- }
-- return NULL; // This whole branch bore nothing
-+ return NULL; // This whole branch bore nothing
- }
-
- // Return the method name with old prefixes stripped away.
-@@ -3042,10 +3234,10 @@
- ResourceMark rm;
- char* name_str = method_name_without_prefixes(method);
- return search_prefix_name_space(0, name_str, strlen(name_str),
-- method->signature());
-+ method->signature());
- }
-
-- public:
-+public:
-
- // Construct a native method transfer processor for this class.
- TransferNativeFunctionRegistration(instanceKlassHandle _the_class) {
-@@ -3056,9 +3248,9 @@
- }
-
- // Attempt to transfer any of the old or deleted methods that are native
-- void transfer_registrations(methodOop* old_methods, int methods_length) {
-+ void transfer_registrations(instanceKlassHandle old_klass, int* old_methods, int methods_length) {
- for (int j = 0; j < methods_length; j++) {
-- methodOop old_method = old_methods[j];
-+ methodOop old_method = (methodOop)old_klass->methods()->obj_at(old_methods[j]);
-
- if (old_method->is_native() && old_method->has_native_function()) {
- methodOop new_method = strip_and_search_for_new_native(old_method);
-@@ -3067,7 +3259,9 @@
- // Redefine does not send events (except CFLH), certainly not this
- // behind the scenes re-registration.
- new_method->set_native_function(old_method->native_function(),
-- !methodOopDesc::native_bind_event_is_interesting);
-+ !methodOopDesc::native_bind_event_is_interesting);
-+
-+ RC_TRACE(0x00008000, ("Transferring native function for method %s", old_method->name()->as_C_string()));
- }
- }
- }
-@@ -3075,544 +3269,8 @@
- };
-
- // Don't lose the association between a native method and its JNI function.
--void VM_RedefineClasses::transfer_old_native_function_registrations(instanceKlassHandle the_class) {
-- TransferNativeFunctionRegistration transfer(the_class);
-- transfer.transfer_registrations(_deleted_methods, _deleted_methods_length);
-- transfer.transfer_registrations(_matching_old_methods, _matching_methods_length);
--}
--
--// Deoptimize all compiled code that depends on this class.
--//
--// If the can_redefine_classes capability is obtained in the onload
--// phase then the compiler has recorded all dependencies from startup.
--// In that case we need only deoptimize and throw away all compiled code
--// that depends on the class.
--//
--// If can_redefine_classes is obtained sometime after the onload
--// phase then the dependency information may be incomplete. In that case
--// the first call to RedefineClasses causes all compiled code to be
--// thrown away. As can_redefine_classes has been obtained then
--// all future compilations will record dependencies so second and
--// subsequent calls to RedefineClasses need only throw away code
--// that depends on the class.
--//
--void VM_RedefineClasses::flush_dependent_code(instanceKlassHandle k_h, TRAPS) {
-- assert_locked_or_safepoint(Compile_lock);
--
-- // All dependencies have been recorded from startup or this is a second or
-- // subsequent use of RedefineClasses
-- if (JvmtiExport::all_dependencies_are_recorded()) {
-- Universe::flush_evol_dependents_on(k_h);
-- } else {
-- CodeCache::mark_all_nmethods_for_deoptimization();
--
-- ResourceMark rm(THREAD);
-- DeoptimizationMarker dm;
--
-- // Deoptimize all activations depending on marked nmethods
-- Deoptimization::deoptimize_dependents();
--
-- // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies)
-- CodeCache::make_marked_nmethods_not_entrant();
--
-- // From now on we know that the dependency information is complete
-- JvmtiExport::set_all_dependencies_are_recorded(true);
-- }
--}
--
--void VM_RedefineClasses::compute_added_deleted_matching_methods() {
-- methodOop old_method;
-- methodOop new_method;
--
-- _matching_old_methods = NEW_RESOURCE_ARRAY(methodOop, _old_methods->length());
-- _matching_new_methods = NEW_RESOURCE_ARRAY(methodOop, _old_methods->length());
-- _added_methods = NEW_RESOURCE_ARRAY(methodOop, _new_methods->length());
-- _deleted_methods = NEW_RESOURCE_ARRAY(methodOop, _old_methods->length());
--
-- _matching_methods_length = 0;
-- _deleted_methods_length = 0;
-- _added_methods_length = 0;
--
-- int nj = 0;
-- int oj = 0;
-- while (true) {
-- if (oj >= _old_methods->length()) {
-- if (nj >= _new_methods->length()) {
-- break; // we've looked at everything, done
-- }
-- // New method at the end
-- new_method = (methodOop) _new_methods->obj_at(nj);
-- _added_methods[_added_methods_length++] = new_method;
-- ++nj;
-- } else if (nj >= _new_methods->length()) {
-- // Old method, at the end, is deleted
-- old_method = (methodOop) _old_methods->obj_at(oj);
-- _deleted_methods[_deleted_methods_length++] = old_method;
-- ++oj;
-- } else {
-- old_method = (methodOop) _old_methods->obj_at(oj);
-- new_method = (methodOop) _new_methods->obj_at(nj);
-- if (old_method->name() == new_method->name()) {
-- if (old_method->signature() == new_method->signature()) {
-- _matching_old_methods[_matching_methods_length ] = old_method;
-- _matching_new_methods[_matching_methods_length++] = new_method;
-- ++nj;
-- ++oj;
-- } else {
-- // added overloaded have already been moved to the end,
-- // so this is a deleted overloaded method
-- _deleted_methods[_deleted_methods_length++] = old_method;
-- ++oj;
-- }
-- } else { // names don't match
-- if (old_method->name()->fast_compare(new_method->name()) > 0) {
-- // new method
-- _added_methods[_added_methods_length++] = new_method;
-- ++nj;
-- } else {
-- // deleted method
-- _deleted_methods[_deleted_methods_length++] = old_method;
-- ++oj;
-- }
-- }
-- }
-- }
-- assert(_matching_methods_length + _deleted_methods_length == _old_methods->length(), "sanity");
-- assert(_matching_methods_length + _added_methods_length == _new_methods->length(), "sanity");
--}
--
--
--
--// Install the redefinition of a class:
--// - house keeping (flushing breakpoints and caches, deoptimizing
--// dependent compiled code)
--// - replacing parts in the_class with parts from scratch_class
--// - adding a weak reference to track the obsolete but interesting
--// parts of the_class
--// - adjusting constant pool caches and vtables in other classes
--// that refer to methods in the_class. These adjustments use the
--// SystemDictionary::classes_do() facility which only allows
--// a helper method to be specified. The interesting parameters
--// that we would like to pass to the helper method are saved in
--// static global fields in the VM operation.
--void VM_RedefineClasses::redefine_single_class(jclass the_jclass,
-- instanceKlassHandle scratch_class, TRAPS) {
--
-- RC_TIMER_START(_timer_rsc_phase1);
--
-- oop the_class_mirror = JNIHandles::resolve_non_null(the_jclass);
-- klassOop the_class_oop = java_lang_Class::as_klassOop(the_class_mirror);
-- instanceKlassHandle the_class = instanceKlassHandle(THREAD, the_class_oop);
--
-- // Remove all breakpoints in methods of this class
-- JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
-- jvmti_breakpoints.clearall_in_class_at_safepoint(the_class_oop);
--
-- if (the_class_oop == Universe::reflect_invoke_cache()->klass()) {
-- // We are redefining java.lang.reflect.Method. Method.invoke() is
-- // cached and users of the cache care about each active version of
-- // the method so we have to track this previous version.
-- // Do this before methods get switched
-- Universe::reflect_invoke_cache()->add_previous_version(
-- the_class->method_with_idnum(Universe::reflect_invoke_cache()->method_idnum()));
-- }
--
-- // Deoptimize all compiled code that depends on this class
-- flush_dependent_code(the_class, THREAD);
--
-- _old_methods = the_class->methods();
-- _new_methods = scratch_class->methods();
-- _the_class_oop = the_class_oop;
-- compute_added_deleted_matching_methods();
-- update_jmethod_ids();
--
-- // Attach new constant pool to the original klass. The original
-- // klass still refers to the old constant pool (for now).
-- scratch_class->constants()->set_pool_holder(the_class());
--
--#if 0
-- // In theory, with constant pool merging in place we should be able
-- // to save space by using the new, merged constant pool in place of
-- // the old constant pool(s). By "pool(s)" I mean the constant pool in
-- // the klass version we are replacing now and any constant pool(s) in
-- // previous versions of klass. Nice theory, doesn't work in practice.
-- // When this code is enabled, even simple programs throw NullPointer
-- // exceptions. I'm guessing that this is caused by some constant pool
-- // cache difference between the new, merged constant pool and the
-- // constant pool that was just being used by the klass. I'm keeping
-- // this code around to archive the idea, but the code has to remain
-- // disabled for now.
--
-- // Attach each old method to the new constant pool. This can be
-- // done here since we are past the bytecode verification and
-- // constant pool optimization phases.
-- for (int i = _old_methods->length() - 1; i >= 0; i--) {
-- methodOop method = (methodOop)_old_methods->obj_at(i);
-- method->set_constants(scratch_class->constants());
-- }
--
-- {
-- // walk all previous versions of the klass
-- instanceKlass *ik = (instanceKlass *)the_class()->klass_part();
-- PreviousVersionWalker pvw(ik);
-- instanceKlassHandle ikh;
-- do {
-- ikh = pvw.next_previous_version();
-- if (!ikh.is_null()) {
-- ik = ikh();
--
-- // attach previous version of klass to the new constant pool
-- ik->set_constants(scratch_class->constants());
--
-- // Attach each method in the previous version of klass to the
-- // new constant pool
-- objArrayOop prev_methods = ik->methods();
-- for (int i = prev_methods->length() - 1; i >= 0; i--) {
-- methodOop method = (methodOop)prev_methods->obj_at(i);
-- method->set_constants(scratch_class->constants());
-- }
-- }
-- } while (!ikh.is_null());
-- }
--#endif
--
-- // Replace methods and constantpool
-- the_class->set_methods(_new_methods);
-- scratch_class->set_methods(_old_methods); // To prevent potential GCing of the old methods,
-- // and to be able to undo operation easily.
--
-- constantPoolOop old_constants = the_class->constants();
-- the_class->set_constants(scratch_class->constants());
-- scratch_class->set_constants(old_constants); // See the previous comment.
--#if 0
-- // We are swapping the guts of "the new class" with the guts of "the
-- // class". Since the old constant pool has just been attached to "the
-- // new class", it seems logical to set the pool holder in the old
-- // constant pool also. However, doing this will change the observable
-- // class hierarchy for any old methods that are still executing. A
-- // method can query the identity of its "holder" and this query uses
-- // the method's constant pool link to find the holder. The change in
-- // holding class from "the class" to "the new class" can confuse
-- // things.
-- //
-- // Setting the old constant pool's holder will also cause
-- // verification done during vtable initialization below to fail.
-- // During vtable initialization, the vtable's class is verified to be
-- // a subtype of the method's holder. The vtable's class is "the
-- // class" and the method's holder is gotten from the constant pool
-- // link in the method itself. For "the class"'s directly implemented
-- // methods, the method holder is "the class" itself (as gotten from
-- // the new constant pool). The check works fine in this case. The
-- // check also works fine for methods inherited from super classes.
-- //
-- // Miranda methods are a little more complicated. A miranda method is
-- // provided by an interface when the class implementing the interface
-- // does not provide its own method. These interfaces are implemented
-- // internally as an instanceKlass. These special instanceKlasses
-- // share the constant pool of the class that "implements" the
-- // interface. By sharing the constant pool, the method holder of a
-- // miranda method is the class that "implements" the interface. In a
-- // non-redefine situation, the subtype check works fine. However, if
-- // the old constant pool's pool holder is modified, then the check
-- // fails because there is no class hierarchy relationship between the
-- // vtable's class and "the new class".
--
-- old_constants->set_pool_holder(scratch_class());
--#endif
--
-- // track which methods are EMCP for add_previous_version() call below
-- BitMap emcp_methods(_old_methods->length());
-- int emcp_method_count = 0;
-- emcp_methods.clear(); // clears 0..(length() - 1)
-- check_methods_and_mark_as_obsolete(&emcp_methods, &emcp_method_count);
-- transfer_old_native_function_registrations(the_class);
--
-- // The class file bytes from before any retransformable agents mucked
-- // with them was cached on the scratch class, move to the_class.
-- // Note: we still want to do this if nothing needed caching since it
-- // should get cleared in the_class too.
-- if (the_class->get_cached_class_file_bytes() == 0) {
-- // the_class doesn't have a cache yet so copy it
-- the_class->set_cached_class_file(
-- scratch_class->get_cached_class_file_bytes(),
-- scratch_class->get_cached_class_file_len());
-- }
--#ifndef PRODUCT
-- else {
-- assert(the_class->get_cached_class_file_bytes() ==
-- scratch_class->get_cached_class_file_bytes(), "cache ptrs must match");
-- assert(the_class->get_cached_class_file_len() ==
-- scratch_class->get_cached_class_file_len(), "cache lens must match");
-- }
--#endif
--
-- // Replace inner_classes
-- typeArrayOop old_inner_classes = the_class->inner_classes();
-- the_class->set_inner_classes(scratch_class->inner_classes());
-- scratch_class->set_inner_classes(old_inner_classes);
--
-- // Initialize the vtable and interface table after
-- // methods have been rewritten
-- {
-- ResourceMark rm(THREAD);
-- // no exception should happen here since we explicitly
-- // do not check loader constraints.
-- // compare_and_normalize_class_versions has already checked:
-- // - classloaders unchanged, signatures unchanged
-- // - all instanceKlasses for redefined classes reused & contents updated
-- the_class->vtable()->initialize_vtable(false, THREAD);
-- the_class->itable()->initialize_itable(false, THREAD);
-- assert(!HAS_PENDING_EXCEPTION || (THREAD->pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())), "redefine exception");
-- }
--
-- // Leave arrays of jmethodIDs and itable index cache unchanged
--
-- // Copy the "source file name" attribute from new class version
-- the_class->set_source_file_name(scratch_class->source_file_name());
--
-- // Copy the "source debug extension" attribute from new class version
-- the_class->set_source_debug_extension(
-- scratch_class->source_debug_extension(),
-- scratch_class->source_debug_extension() == NULL ? 0 :
-- (int)strlen(scratch_class->source_debug_extension()));
--
-- // Use of javac -g could be different in the old and the new
-- if (scratch_class->access_flags().has_localvariable_table() !=
-- the_class->access_flags().has_localvariable_table()) {
--
-- AccessFlags flags = the_class->access_flags();
-- if (scratch_class->access_flags().has_localvariable_table()) {
-- flags.set_has_localvariable_table();
-- } else {
-- flags.clear_has_localvariable_table();
-- }
-- the_class->set_access_flags(flags);
-- }
--
-- // Replace class annotation fields values
-- typeArrayOop old_class_annotations = the_class->class_annotations();
-- the_class->set_class_annotations(scratch_class->class_annotations());
-- scratch_class->set_class_annotations(old_class_annotations);
--
-- // Replace fields annotation fields values
-- objArrayOop old_fields_annotations = the_class->fields_annotations();
-- the_class->set_fields_annotations(scratch_class->fields_annotations());
-- scratch_class->set_fields_annotations(old_fields_annotations);
--
-- // Replace methods annotation fields values
-- objArrayOop old_methods_annotations = the_class->methods_annotations();
-- the_class->set_methods_annotations(scratch_class->methods_annotations());
-- scratch_class->set_methods_annotations(old_methods_annotations);
--
-- // Replace methods parameter annotation fields values
-- objArrayOop old_methods_parameter_annotations =
-- the_class->methods_parameter_annotations();
-- the_class->set_methods_parameter_annotations(
-- scratch_class->methods_parameter_annotations());
-- scratch_class->set_methods_parameter_annotations(old_methods_parameter_annotations);
--
-- // Replace methods default annotation fields values
-- objArrayOop old_methods_default_annotations =
-- the_class->methods_default_annotations();
-- the_class->set_methods_default_annotations(
-- scratch_class->methods_default_annotations());
-- scratch_class->set_methods_default_annotations(old_methods_default_annotations);
--
-- // Replace minor version number of class file
-- u2 old_minor_version = the_class->minor_version();
-- the_class->set_minor_version(scratch_class->minor_version());
-- scratch_class->set_minor_version(old_minor_version);
--
-- // Replace major version number of class file
-- u2 old_major_version = the_class->major_version();
-- the_class->set_major_version(scratch_class->major_version());
-- scratch_class->set_major_version(old_major_version);
--
-- // Replace CP indexes for class and name+type of enclosing method
-- u2 old_class_idx = the_class->enclosing_method_class_index();
-- u2 old_method_idx = the_class->enclosing_method_method_index();
-- the_class->set_enclosing_method_indices(
-- scratch_class->enclosing_method_class_index(),
-- scratch_class->enclosing_method_method_index());
-- scratch_class->set_enclosing_method_indices(old_class_idx, old_method_idx);
--
-- // keep track of previous versions of this class
-- the_class->add_previous_version(scratch_class, &emcp_methods,
-- emcp_method_count);
--
-- RC_TIMER_STOP(_timer_rsc_phase1);
-- RC_TIMER_START(_timer_rsc_phase2);
--
-- // Adjust constantpool caches and vtables for all classes
-- // that reference methods of the evolved class.
-- SystemDictionary::classes_do(adjust_cpool_cache_and_vtable, THREAD);
--
-- // JSR-292 support
-- MemberNameTable* mnt = the_class->member_names();
-- if (mnt != NULL) {
-- bool trace_name_printed = false;
-- mnt->adjust_method_entries(_matching_old_methods,
-- _matching_new_methods,
-- _matching_methods_length,
-- &trace_name_printed);
-- }
--
-- if (the_class->oop_map_cache() != NULL) {
-- // Flush references to any obsolete methods from the oop map cache
-- // so that obsolete methods are not pinned.
-- the_class->oop_map_cache()->flush_obsolete_entries();
-- }
--
-- // increment the classRedefinedCount field in the_class and in any
-- // direct and indirect subclasses of the_class
-- increment_class_counter((instanceKlass *)the_class()->klass_part(), THREAD);
--
-- // RC_TRACE macro has an embedded ResourceMark
-- RC_TRACE_WITH_THREAD(0x00000001, THREAD,
-- ("redefined name=%s, count=%d (avail_mem=" UINT64_FORMAT "K)",
-- the_class->external_name(),
-- java_lang_Class::classRedefinedCount(the_class_mirror),
-- os::available_memory() >> 10));
--
-- RC_TIMER_STOP(_timer_rsc_phase2);
--} // end redefine_single_class()
--
--
--// Increment the classRedefinedCount field in the specific instanceKlass
--// and in all direct and indirect subclasses.
--void VM_RedefineClasses::increment_class_counter(instanceKlass *ik, TRAPS) {
-- oop class_mirror = ik->java_mirror();
-- klassOop class_oop = java_lang_Class::as_klassOop(class_mirror);
-- int new_count = java_lang_Class::classRedefinedCount(class_mirror) + 1;
-- java_lang_Class::set_classRedefinedCount(class_mirror, new_count);
--
-- if (class_oop != _the_class_oop) {
-- // _the_class_oop count is printed at end of redefine_single_class()
-- RC_TRACE_WITH_THREAD(0x00000008, THREAD,
-- ("updated count in subclass=%s to %d", ik->external_name(), new_count));
-- }
--
-- for (Klass *subk = ik->subklass(); subk != NULL;
-- subk = subk->next_sibling()) {
-- if (subk->oop_is_instance()) {
-- // Only update instanceKlasses
-- instanceKlass *subik = (instanceKlass*)subk;
-- // recursively do subclasses of the current subclass
-- increment_class_counter(subik, THREAD);
-- }
-- }
--}
--
--void VM_RedefineClasses::check_class(klassOop k_oop,
-- oop initiating_loader, TRAPS) {
-- Klass *k = k_oop->klass_part();
-- if (k->oop_is_instance()) {
-- HandleMark hm(THREAD);
-- instanceKlass *ik = (instanceKlass *) k;
-- bool no_old_methods = true; // be optimistic
-- ResourceMark rm(THREAD);
--
-- // a vtable should never contain old or obsolete methods
-- if (ik->vtable_length() > 0 &&
-- !ik->vtable()->check_no_old_or_obsolete_entries()) {
-- if (RC_TRACE_ENABLED(0x00004000)) {
-- RC_TRACE_WITH_THREAD(0x00004000, THREAD,
-- ("klassVtable::check_no_old_or_obsolete_entries failure"
-- " -- OLD or OBSOLETE method found -- class: %s",
-- ik->signature_name()));
-- ik->vtable()->dump_vtable();
-- }
-- no_old_methods = false;
-- }
--
-- // an itable should never contain old or obsolete methods
-- if (ik->itable_length() > 0 &&
-- !ik->itable()->check_no_old_or_obsolete_entries()) {
-- if (RC_TRACE_ENABLED(0x00004000)) {
-- RC_TRACE_WITH_THREAD(0x00004000, THREAD,
-- ("klassItable::check_no_old_or_obsolete_entries failure"
-- " -- OLD or OBSOLETE method found -- class: %s",
-- ik->signature_name()));
-- ik->itable()->dump_itable();
-- }
-- no_old_methods = false;
-- }
--
-- // the constant pool cache should never contain old or obsolete methods
-- if (ik->constants() != NULL &&
-- ik->constants()->cache() != NULL &&
-- !ik->constants()->cache()->check_no_old_or_obsolete_entries()) {
-- if (RC_TRACE_ENABLED(0x00004000)) {
-- RC_TRACE_WITH_THREAD(0x00004000, THREAD,
-- ("cp-cache::check_no_old_or_obsolete_entries failure"
-- " -- OLD or OBSOLETE method found -- class: %s",
-- ik->signature_name()));
-- ik->constants()->cache()->dump_cache();
-- }
-- no_old_methods = false;
-- }
--
-- if (!no_old_methods) {
-- if (RC_TRACE_ENABLED(0x00004000)) {
-- dump_methods();
-- } else {
-- tty->print_cr("INFO: use the '-XX:TraceRedefineClasses=16384' option "
-- "to see more info about the following guarantee() failure.");
-- }
-- guarantee(false, "OLD and/or OBSOLETE method(s) found");
-- }
-- }
--}
--
--void VM_RedefineClasses::dump_methods() {
-- int j;
-- RC_TRACE(0x00004000, ("_old_methods --"));
-- for (j = 0; j < _old_methods->length(); ++j) {
-- methodOop m = (methodOop) _old_methods->obj_at(j);
-- RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index()));
-- m->access_flags().print_on(tty);
-- tty->print(" -- ");
-- m->print_name(tty);
-- tty->cr();
-- }
-- RC_TRACE(0x00004000, ("_new_methods --"));
-- for (j = 0; j < _new_methods->length(); ++j) {
-- methodOop m = (methodOop) _new_methods->obj_at(j);
-- RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index()));
-- m->access_flags().print_on(tty);
-- tty->print(" -- ");
-- m->print_name(tty);
-- tty->cr();
-- }
-- RC_TRACE(0x00004000, ("_matching_(old/new)_methods --"));
-- for (j = 0; j < _matching_methods_length; ++j) {
-- methodOop m = _matching_old_methods[j];
-- RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index()));
-- m->access_flags().print_on(tty);
-- tty->print(" -- ");
-- m->print_name(tty);
-- tty->cr();
-- m = _matching_new_methods[j];
-- RC_TRACE_NO_CR(0x00004000, (" (%5d) ", m->vtable_index()));
-- m->access_flags().print_on(tty);
-- tty->cr();
-- }
-- RC_TRACE(0x00004000, ("_deleted_methods --"));
-- for (j = 0; j < _deleted_methods_length; ++j) {
-- methodOop m = _deleted_methods[j];
-- RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index()));
-- m->access_flags().print_on(tty);
-- tty->print(" -- ");
-- m->print_name(tty);
-- tty->cr();
-- }
-- RC_TRACE(0x00004000, ("_added_methods --"));
-- for (j = 0; j < _added_methods_length; ++j) {
-- methodOop m = _added_methods[j];
-- RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index()));
-- m->access_flags().print_on(tty);
-- tty->print(" -- ");
-- m->print_name(tty);
-- tty->cr();
-- }
-+void VM_RedefineClasses::transfer_old_native_function_registrations(instanceKlassHandle old_klass) {
-+ TransferNativeFunctionRegistration transfer(old_klass);
-+ transfer.transfer_registrations(old_klass, _deleted_methods, _deleted_methods_length);
-+ transfer.transfer_registrations(old_klass, _matching_old_methods, _matching_methods_length);
- }
-diff --git a/src/share/vm/prims/jvmtiRedefineClasses.hpp b/src/share/vm/prims/jvmtiRedefineClasses.hpp
-index bfac62c..d7ba79f 100644
---- a/src/share/vm/prims/jvmtiRedefineClasses.hpp
-+++ b/src/share/vm/prims/jvmtiRedefineClasses.hpp
-@@ -1,26 +1,29 @@
- /*
-- * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
-- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
-- *
-- * This code is free software; you can redistribute it and/or modify it
-- * under the terms of the GNU General Public License version 2 only, as
-- * published by the Free Software Foundation.
-- *
-- * This code is distributed in the hope that it will be useful, but WITHOUT
-- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- * version 2 for more details (a copy is included in the LICENSE file that
-- * accompanied this code).
-- *
-- * You should have received a copy of the GNU General Public License version
-- * 2 along with this work; if not, write to the Free Software Foundation,
-- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
-- *
-- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
-- * or visit www.oracle.com if you need additional information or have any
-- * questions.
-- *
-- */
-+* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
-+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
-+*
-+* This code is free software; you can redistribute it and/or modify it
-+* under the terms of the GNU General Public License version 2 only, as
-+* published by the Free Software Foundation.
-+*
-+* This code is distributed in the hope that it will be useful, but WITHOUT
-+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-+* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-+* version 2 for more details (a copy is included in the LICENSE file that
-+* accompanied this code).
-+*
-+* You should have received a copy of the GNU General Public License version
-+* 2 along with this work; if not, write to the Free Software Foundation,
-+* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
-+*
-+* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
-+* or visit www.oracle.com if you need additional information or have any
-+* questions.
-+*
-+*/
-+
-+// New version that allows arbitrary changes to already loaded classes.
-+// Modifications done by: Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
-
- #ifndef SHARE_VM_PRIMS_JVMTIREDEFINECLASSES_HPP
- #define SHARE_VM_PRIMS_JVMTIREDEFINECLASSES_HPP
-@@ -32,330 +35,27 @@
- #include "oops/objArrayOop.hpp"
- #include "prims/jvmtiRedefineClassesTrace.hpp"
- #include "runtime/vm_operations.hpp"
-+#include "gc_implementation/shared/vmGCOperations.hpp"
-
--// Introduction:
--//
--// The RedefineClasses() API is used to change the definition of one or
--// more classes. While the API supports redefining more than one class
--// in a single call, in general, the API is discussed in the context of
--// changing the definition of a single current class to a single new
--// class. For clarity, the current class is will always be called
--// "the_class" and the new class will always be called "scratch_class".
--//
--// The name "the_class" is used because there is only one structure
--// that represents a specific class; redefinition does not replace the
--// structure, but instead replaces parts of the structure. The name
--// "scratch_class" is used because the structure that represents the
--// new definition of a specific class is simply used to carry around
--// the parts of the new definition until they are used to replace the
--// appropriate parts in the_class. Once redefinition of a class is
--// complete, scratch_class is thrown away.
--//
--//
--// Implementation Overview:
--//
--// The RedefineClasses() API is mostly a wrapper around the VM op that
--// does the real work. The work is split in varying degrees between
--// doit_prologue(), doit() and doit_epilogue().
--//
--// 1) doit_prologue() is called by the JavaThread on the way to a
--// safepoint. It does parameter verification and loads scratch_class
--// which involves:
--// - parsing the incoming class definition using the_class' class
--// loader and security context
--// - linking scratch_class
--// - merging constant pools and rewriting bytecodes as needed
--// for the merged constant pool
--// - verifying the bytecodes in scratch_class
--// - setting up the constant pool cache and rewriting bytecodes
--// as needed to use the cache
--// - finally, scratch_class is compared to the_class to verify
--// that it is a valid replacement class
--// - if everything is good, then scratch_class is saved in an
--// instance field in the VM operation for the doit() call
--//
--// Note: A JavaThread must do the above work.
--//
--// 2) doit() is called by the VMThread during a safepoint. It installs
--// the new class definition(s) which involves:
--// - retrieving the scratch_class from the instance field in the
--// VM operation
--// - house keeping (flushing breakpoints and caches, deoptimizing
--// dependent compiled code)
--// - replacing parts in the_class with parts from scratch_class
--// - adding weak reference(s) to track the obsolete but interesting
--// parts of the_class
--// - adjusting constant pool caches and vtables in other classes
--// that refer to methods in the_class. These adjustments use the
--// SystemDictionary::classes_do() facility which only allows
--// a helper method to be specified. The interesting parameters
--// that we would like to pass to the helper method are saved in
--// static global fields in the VM operation.
--// - telling the SystemDictionary to notice our changes
--//
--// Note: the above work must be done by the VMThread to be safe.
--//
--// 3) doit_epilogue() is called by the JavaThread after the VM op
--// is finished and the safepoint is done. It simply cleans up
--// memory allocated in doit_prologue() and used in doit().
--//
--//
--// Constant Pool Details:
--//
--// When the_class is redefined, we cannot just replace the constant
--// pool in the_class with the constant pool from scratch_class because
--// that could confuse obsolete methods that may still be running.
--// Instead, the constant pool from the_class, old_cp, is merged with
--// the constant pool from scratch_class, scratch_cp. The resulting
--// constant pool, merge_cp, replaces old_cp in the_class.
--//
--// The key part of any merging algorithm is the entry comparison
--// function so we have to know the types of entries in a constant pool
--// in order to merge two of them together. Constant pools can contain
--// up to 12 different kinds of entries; the JVM_CONSTANT_Unicode entry
--// is not presently used so we only have to worry about the other 11
--// entry types. For the purposes of constant pool merging, it is
--// helpful to know that the 11 entry types fall into 3 different
--// subtypes: "direct", "indirect" and "double-indirect".
--//
--// Direct CP entries contain data and do not contain references to
--// other CP entries. The following are direct CP entries:
--// JVM_CONSTANT_{Double,Float,Integer,Long,Utf8}
--//
--// Indirect CP entries contain 1 or 2 references to a direct CP entry
--// and no other data. The following are indirect CP entries:
--// JVM_CONSTANT_{Class,NameAndType,String}
--//
--// Double-indirect CP entries contain two references to indirect CP
--// entries and no other data. The following are double-indirect CP
--// entries:
--// JVM_CONSTANT_{Fieldref,InterfaceMethodref,Methodref}
--//
--// When comparing entries between two constant pools, the entry types
--// are compared first and if they match, then further comparisons are
--// made depending on the entry subtype. Comparing direct CP entries is
--// simply a matter of comparing the data associated with each entry.
--// Comparing both indirect and double-indirect CP entries requires
--// recursion.
--//
--// Fortunately, the recursive combinations are limited because indirect
--// CP entries can only refer to direct CP entries and double-indirect
--// CP entries can only refer to indirect CP entries. The following is
--// an example illustration of the deepest set of indirections needed to
--// access the data associated with a JVM_CONSTANT_Fieldref entry:
--//
--// JVM_CONSTANT_Fieldref {
--// class_index => JVM_CONSTANT_Class {
--// name_index => JVM_CONSTANT_Utf8 {
--// <data-1>
--// }
--// }
--// name_and_type_index => JVM_CONSTANT_NameAndType {
--// name_index => JVM_CONSTANT_Utf8 {
--// <data-2>
--// }
--// descriptor_index => JVM_CONSTANT_Utf8 {
--// <data-3>
--// }
--// }
--// }
--//
--// The above illustration is not a data structure definition for any
--// computer language. The curly braces ('{' and '}') are meant to
--// delimit the context of the "fields" in the CP entry types shown.
--// Each indirection from the JVM_CONSTANT_Fieldref entry is shown via
--// "=>", e.g., the class_index is used to indirectly reference a
--// JVM_CONSTANT_Class entry where the name_index is used to indirectly
--// reference a JVM_CONSTANT_Utf8 entry which contains the interesting
--// <data-1>. In order to understand a JVM_CONSTANT_Fieldref entry, we
--// have to do a total of 5 indirections just to get to the CP entries
--// that contain the interesting pieces of data and then we have to
--// fetch the three pieces of data. This means we have to do a total of
--// (5 + 3) * 2 == 16 dereferences to compare two JVM_CONSTANT_Fieldref
--// entries.
--//
--// Here is the indirection, data and dereference count for each entry
--// type:
--//
--// JVM_CONSTANT_Class 1 indir, 1 data, 2 derefs
--// JVM_CONSTANT_Double 0 indir, 1 data, 1 deref
--// JVM_CONSTANT_Fieldref 2 indir, 3 data, 8 derefs
--// JVM_CONSTANT_Float 0 indir, 1 data, 1 deref
--// JVM_CONSTANT_Integer 0 indir, 1 data, 1 deref
--// JVM_CONSTANT_InterfaceMethodref 2 indir, 3 data, 8 derefs
--// JVM_CONSTANT_Long 0 indir, 1 data, 1 deref
--// JVM_CONSTANT_Methodref 2 indir, 3 data, 8 derefs
--// JVM_CONSTANT_NameAndType 1 indir, 2 data, 4 derefs
--// JVM_CONSTANT_String 1 indir, 1 data, 2 derefs
--// JVM_CONSTANT_Utf8 0 indir, 1 data, 1 deref
--//
--// So different subtypes of CP entries require different amounts of
--// work for a proper comparison.
--//
--// Now that we've talked about the different entry types and how to
--// compare them we need to get back to merging. This is not a merge in
--// the "sort -u" sense or even in the "sort" sense. When we merge two
--// constant pools, we copy all the entries from old_cp to merge_cp,
--// preserving entry order. Next we append all the unique entries from
--// scratch_cp to merge_cp and we track the index changes from the
--// location in scratch_cp to the possibly new location in merge_cp.
--// When we are done, any obsolete code that is still running that
--// uses old_cp should not be able to observe any difference if it
--// were to use merge_cp. As for the new code in scratch_class, it is
--// modified to use the appropriate index values in merge_cp before it
--// is used to replace the code in the_class.
--//
--// There is one small complication in copying the entries from old_cp
--// to merge_cp. Two of the CP entry types are special in that they are
--// lazily resolved. Before explaining the copying complication, we need
--// to digress into CP entry resolution.
--//
--// JVM_CONSTANT_Class and JVM_CONSTANT_String entries are present in
--// the class file, but are not stored in memory as such until they are
--// resolved. The entries are not resolved unless they are used because
--// resolution is expensive. During class file parsing the entries are
--// initially stored in memory as JVM_CONSTANT_ClassIndex and
--// JVM_CONSTANT_StringIndex entries. These special CP entry types
--// indicate that the JVM_CONSTANT_Class and JVM_CONSTANT_String entries
--// have been parsed, but the index values in the entries have not been
--// validated. After the entire constant pool has been parsed, the index
--// values can be validated and then the entries are converted into
--// JVM_CONSTANT_UnresolvedClass and JVM_CONSTANT_UnresolvedString
--// entries. During this conversion process, the UTF8 values that are
--// indirectly referenced by the JVM_CONSTANT_ClassIndex and
--// JVM_CONSTANT_StringIndex entries are changed into Symbol*s and the
--// entries are modified to refer to the Symbol*s. This optimization
--// eliminates one level of indirection for those two CP entry types and
--// gets the entries ready for verification. During class file parsing
--// it is also possible for JVM_CONSTANT_UnresolvedString entries to be
--// resolved into JVM_CONSTANT_String entries. Verification expects to
--// find JVM_CONSTANT_UnresolvedClass and either JVM_CONSTANT_String or
--// JVM_CONSTANT_UnresolvedString entries and not JVM_CONSTANT_Class
--// entries.
--//
--// Now we can get back to the copying complication. When we copy
--// entries from old_cp to merge_cp, we have to revert any
--// JVM_CONSTANT_Class entries to JVM_CONSTANT_UnresolvedClass entries
--// or verification will fail.
--//
--// It is important to explicitly state that the merging algorithm
--// effectively unresolves JVM_CONSTANT_Class entries that were in the
--// old_cp when they are changed into JVM_CONSTANT_UnresolvedClass
--// entries in the merge_cp. This is done both to make verification
--// happy and to avoid adding more brittleness between RedefineClasses
--// and the constant pool cache. By allowing the constant pool cache
--// implementation to (re)resolve JVM_CONSTANT_UnresolvedClass entries
--// into JVM_CONSTANT_Class entries, we avoid having to embed knowledge
--// about those algorithms in RedefineClasses.
--//
--// Appending unique entries from scratch_cp to merge_cp is straight
--// forward for direct CP entries and most indirect CP entries. For the
--// indirect CP entry type JVM_CONSTANT_NameAndType and for the double-
--// indirect CP entry types, the presence of more than one piece of
--// interesting data makes appending the entries more complicated.
--//
--// For the JVM_CONSTANT_{Double,Float,Integer,Long,Utf8} entry types,
--// the entry is simply copied from scratch_cp to the end of merge_cp.
--// If the index in scratch_cp is different than the destination index
--// in merge_cp, then the change in index value is tracked.
--//
--// Note: the above discussion for the direct CP entries also applies
--// to the JVM_CONSTANT_Unresolved{Class,String} entry types.
--//
--// For the JVM_CONSTANT_{Class,String} entry types, since there is only
--// one data element at the end of the recursion, we know that we have
--// either one or two unique entries. If the JVM_CONSTANT_Utf8 entry is
--// unique then it is appended to merge_cp before the current entry.
--// If the JVM_CONSTANT_Utf8 entry is not unique, then the current entry
--// is updated to refer to the duplicate entry in merge_cp before it is
--// appended to merge_cp. Again, any changes in index values are tracked
--// as needed.
--//
--// Note: the above discussion for JVM_CONSTANT_{Class,String} entry
--// types is theoretical. Since those entry types have already been
--// optimized into JVM_CONSTANT_Unresolved{Class,String} entry types,
--// they are handled as direct CP entries.
--//
--// For the JVM_CONSTANT_NameAndType entry type, since there are two
--// data elements at the end of the recursions, we know that we have
--// between one and three unique entries. Any unique JVM_CONSTANT_Utf8
--// entries are appended to merge_cp before the current entry. For any
--// JVM_CONSTANT_Utf8 entries that are not unique, the current entry is
--// updated to refer to the duplicate entry in merge_cp before it is
--// appended to merge_cp. Again, any changes in index values are tracked
--// as needed.
--//
--// For the JVM_CONSTANT_{Fieldref,InterfaceMethodref,Methodref} entry
--// types, since there are two indirect CP entries and three data
--// elements at the end of the recursions, we know that we have between
--// one and six unique entries. See the JVM_CONSTANT_Fieldref diagram
--// above for an example of all six entries. The uniqueness algorithm
--// for the JVM_CONSTANT_Class and JVM_CONSTANT_NameAndType entries is
--// covered above. Any unique entries are appended to merge_cp before
--// the current entry. For any entries that are not unique, the current
--// entry is updated to refer to the duplicate entry in merge_cp before
--// it is appended to merge_cp. Again, any changes in index values are
--// tracked as needed.
--//
--//
--// Other Details:
--//
--// Details for other parts of RedefineClasses need to be written.
--// This is a placeholder section.
--//
--//
--// Open Issues (in no particular order):
--//
--// - How do we serialize the RedefineClasses() API without deadlocking?
--//
--// - SystemDictionary::parse_stream() was called with a NULL protection
--// domain since the initial version. This has been changed to pass
--// the_class->protection_domain(). This change has been tested with
--// all NSK tests and nothing broke, but what will adding it now break
--// in ways that we don't test?
--//
--// - GenerateOopMap::rewrite_load_or_store() has a comment in its
--// (indirect) use of the Relocator class that the max instruction
--// size is 4 bytes. goto_w and jsr_w are 5 bytes and wide/iinc is
--// 6 bytes. Perhaps Relocator only needs a 4 byte buffer to do
--// what it does to the bytecodes. More investigation is needed.
--//
--// - java.lang.Object methods can be called on arrays. This is
--// implemented via the arrayKlassOop vtable which we don't
--// update. For example, if we redefine java.lang.Object.toString(),
--// then the new version of the method will not be called for array
--// objects.
--//
--// - How do we know if redefine_single_class() and the guts of
--// instanceKlass are out of sync? I don't think this can be
--// automated, but we should probably order the work in
--// redefine_single_class() to match the order of field
--// definitions in instanceKlass. We also need to add some
--// comments about keeping things in sync.
--//
--// - set_new_constant_pool() is huge and we should consider refactoring
--// it into smaller chunks of work.
--//
--// - The exception table update code in set_new_constant_pool() defines
--// const values that are also defined in a local context elsewhere.
--// The same literal values are also used in elsewhere. We need to
--// coordinate a cleanup of these constants with Runtime.
--//
-+#define RC_ABORT(error) { _result = error; return false; }
-
--class VM_RedefineClasses: public VM_Operation {
-+class VM_RedefineClasses: public VM_GC_Operation {
- private:
-+
- // These static fields are needed by SystemDictionary::classes_do()
- // facility and the adjust_cpool_cache_and_vtable() helper:
- static objArrayOop _old_methods;
- static objArrayOop _new_methods;
-- static methodOop* _matching_old_methods;
-- static methodOop* _matching_new_methods;
-- static methodOop* _deleted_methods;
-- static methodOop* _added_methods;
-+ static int* _matching_old_methods;
-+ static int* _matching_new_methods;
-+ static int* _deleted_methods;
-+ static int* _added_methods;
- static int _matching_methods_length;
- static int _deleted_methods_length;
- static int _added_methods_length;
- static klassOop _the_class_oop;
-+
-+ static int _revision_number;
-
- // The instance fields are used to pass information from
- // doit_prologue() to doit() and doit_epilogue().
-@@ -370,42 +70,28 @@
- // _index_map_p contains any entries.
- int _index_map_count;
- intArray * _index_map_p;
--
-- // _operands_index_map_count is just an optimization for knowing if
-- // _operands_index_map_p contains any entries.
-- int _operands_cur_length;
-- int _operands_index_map_count;
-- intArray * _operands_index_map_p;
--
-- // ptr to _class_count scratch_classes
-- instanceKlassHandle * _scratch_classes;
-- jvmtiError _res;
-+ GrowableArray<instanceKlassHandle>* _new_classes;
-+ GrowableArray<oop>* _updated_oops;
-+ jvmtiError _result;
-+ int _max_redefinition_flags;
-
- // Performance measurement support. These timers do not cover all
- // the work done for JVM/TI RedefineClasses() but they do cover
- // the heavy lifting.
-- elapsedTimer _timer_rsc_phase1;
-- elapsedTimer _timer_rsc_phase2;
-- elapsedTimer _timer_vm_op_prologue;
-+ elapsedTimer _timer_total;
-+ elapsedTimer _timer_prologue;
-+ elapsedTimer _timer_class_linking;
-+ elapsedTimer _timer_class_loading;
-+ elapsedTimer _timer_check_type;
-+ elapsedTimer _timer_prepare_redefinition;
-+ elapsedTimer _timer_wait_for_locks;
-+ elapsedTimer _timer_redefinition;
-+ elapsedTimer _timer_vm_op_epilogue;
-
-- // These routines are roughly in call order unless otherwise noted.
--
-- // Load the caller's new class definition(s) into _scratch_classes.
-- // Constant pool merging work is done here as needed. Also calls
-- // compare_and_normalize_class_versions() to verify the class
-- // definition(s).
-+ jvmtiError check_redefinition_allowed(instanceKlassHandle new_class);
-+ jvmtiError find_sorted_affected_classes(GrowableArray<instanceKlassHandle> *all_affected_klasses);
-+ jvmtiError find_class_bytes(instanceKlassHandle the_class, const unsigned char **class_bytes, jint *class_byte_count, jboolean *not_changed);
- jvmtiError load_new_class_versions(TRAPS);
--
-- // Verify that the caller provided class definition(s) that meet
-- // the restrictions of RedefineClasses. Normalize the order of
-- // overloaded methods as needed.
-- jvmtiError compare_and_normalize_class_versions(
-- instanceKlassHandle the_class, instanceKlassHandle scratch_class);
--
-- // Swap annotations[i] with annotations[j]
-- // Used by compare_and_normalize_class_versions() when normalizing
-- // overloaded methods or changing idnum as when adding or deleting methods.
-- void swap_all_method_annotations(int i, int j, instanceKlassHandle scratch_class);
-
- // Figure out which new methods match old methods in name and signature,
- // which methods have been added, and which are no longer present
-@@ -414,103 +100,99 @@
- // Change jmethodIDs to point to the new methods
- void update_jmethod_ids();
-
-- // In addition to marking methods as obsolete, this routine
-- // records which methods are EMCP (Equivalent Module Constant
-- // Pool) in the emcp_methods BitMap and returns the number of
-- // EMCP methods via emcp_method_count_p. This information is
-- // used when information about the previous version of the_class
-- // is squirreled away.
-- void check_methods_and_mark_as_obsolete(BitMap *emcp_methods,
-- int * emcp_method_count_p);
-- void transfer_old_native_function_registrations(instanceKlassHandle the_class);
-+ class FindAffectedKlassesClosure : public ObjectClosure {
-
-- // Unevolving classes may point to methods of the_class directly
-- // from their constant pool caches, itables, and/or vtables. We
-- // use the SystemDictionary::classes_do() facility and this helper
-- // to fix up these pointers.
-- static void adjust_cpool_cache_and_vtable(klassOop k_oop, oop loader, TRAPS);
-+ private:
-+ GrowableArray<instanceKlassHandle> *_original_klasses;
-+ GrowableArray<instanceKlassHandle> *_result;
-+
-+ public:
-+ FindAffectedKlassesClosure(GrowableArray<instanceKlassHandle> *original_klasses, GrowableArray<instanceKlassHandle> *result);
-+
-+ virtual void do_object(oop obj);
-+ };
-+
-+
-+ static jvmtiError do_topological_class_sorting(const jvmtiClassDefinition *class_definitions, int class_count, GrowableArray<instanceKlassHandle> *affected, GrowableArray<instanceKlassHandle> *arr, TRAPS);
-
- // Install the redefinition of a class
-- void redefine_single_class(jclass the_jclass,
-- instanceKlassHandle scratch_class, TRAPS);
-+ void redefine_single_class(instanceKlassHandle the_new_class, TRAPS);
-
- // Increment the classRedefinedCount field in the specific instanceKlass
- // and in all direct and indirect subclasses.
- void increment_class_counter(instanceKlass *ik, TRAPS);
-
-- // Support for constant pool merging (these routines are in alpha order):
-- void append_entry(constantPoolHandle scratch_cp, int scratch_i,
-- constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS);
-- void append_operand(constantPoolHandle scratch_cp, int scratch_bootstrap_spec_index,
-- constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS);
-- void finalize_operands_merge(constantPoolHandle merge_cp, TRAPS);
-- int find_or_append_indirect_entry(constantPoolHandle scratch_cp, int scratch_i,
-- constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS);
-- int find_or_append_operand(constantPoolHandle scratch_cp, int scratch_bootstrap_spec_index,
-- constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS);
-- int find_new_index(int old_index);
-- int find_new_operand_index(int old_bootstrap_spec_index);
-- bool is_unresolved_class_mismatch(constantPoolHandle cp1, int index1,
-- constantPoolHandle cp2, int index2);
-- bool is_unresolved_string_mismatch(constantPoolHandle cp1, int index1,
-- constantPoolHandle cp2, int index2);
-- void map_index(constantPoolHandle scratch_cp, int old_index, int new_index);
-- void map_operand_index(int old_bootstrap_spec_index, int new_bootstrap_spec_index);
-- bool merge_constant_pools(constantPoolHandle old_cp,
-- constantPoolHandle scratch_cp, constantPoolHandle *merge_cp_p,
-- int *merge_cp_length_p, TRAPS);
-- jvmtiError merge_cp_and_rewrite(instanceKlassHandle the_class,
-- instanceKlassHandle scratch_class, TRAPS);
-- u2 rewrite_cp_ref_in_annotation_data(
-- typeArrayHandle annotations_typeArray, int &byte_i_ref,
-- const char * trace_mesg, TRAPS);
-- bool rewrite_cp_refs(instanceKlassHandle scratch_class, TRAPS);
-- bool rewrite_cp_refs_in_annotation_struct(
-- typeArrayHandle class_annotations, int &byte_i_ref, TRAPS);
-- bool rewrite_cp_refs_in_annotations_typeArray(
-- typeArrayHandle annotations_typeArray, int &byte_i_ref, TRAPS);
-- bool rewrite_cp_refs_in_class_annotations(
-- instanceKlassHandle scratch_class, TRAPS);
-- bool rewrite_cp_refs_in_element_value(
-- typeArrayHandle class_annotations, int &byte_i_ref, TRAPS);
-- bool rewrite_cp_refs_in_fields_annotations(
-- instanceKlassHandle scratch_class, TRAPS);
-- void rewrite_cp_refs_in_method(methodHandle method,
-- methodHandle * new_method_p, TRAPS);
-- bool rewrite_cp_refs_in_methods(instanceKlassHandle scratch_class, TRAPS);
-- bool rewrite_cp_refs_in_methods_annotations(
-- instanceKlassHandle scratch_class, TRAPS);
-- bool rewrite_cp_refs_in_methods_default_annotations(
-- instanceKlassHandle scratch_class, TRAPS);
-- bool rewrite_cp_refs_in_methods_parameter_annotations(
-- instanceKlassHandle scratch_class, TRAPS);
-- void rewrite_cp_refs_in_stack_map_table(methodHandle method, TRAPS);
-- void rewrite_cp_refs_in_verification_type_info(
-- address& stackmap_addr_ref, address stackmap_end, u2 frame_i,
-- u1 frame_size, TRAPS);
-- void set_new_constant_pool(instanceKlassHandle scratch_class,
-- constantPoolHandle scratch_cp, int scratch_cp_length, TRAPS);
-
- void flush_dependent_code(instanceKlassHandle k_h, TRAPS);
-
-- static void check_class(klassOop k_oop, oop initiating_loader, TRAPS);
-- static void dump_methods();
-+ static void check_class(klassOop k_oop,/* oop initiating_loader,*/ TRAPS) PRODUCT_RETURN;
-+
-+ static void adjust_cpool_cache(klassOop k_oop, oop initiating_loader, TRAPS);
-+
-+#ifdef ASSERT
-+ static void verify_classes(klassOop k_oop, oop initiating_loader, TRAPS);
-+#endif
-+
-+ int calculate_redefinition_flags(instanceKlassHandle new_version);
-+ void calculate_instance_update_information(klassOop new_version);
-+ void check_methods_and_mark_as_obsolete(BitMap *emcp_methods, int * emcp_method_count_p);
-+
-+ static void calculate_type_check_information(klassOop k);
-+ static void clear_type_check_information(klassOop k);
-
- public:
-- VM_RedefineClasses(jint class_count,
-- const jvmtiClassDefinition *class_defs,
-- JvmtiClassLoadKind class_load_kind);
-- VMOp_Type type() const { return VMOp_RedefineClasses; }
-+ VM_RedefineClasses(jint class_count, const jvmtiClassDefinition *class_defs, JvmtiClassLoadKind class_load_kind);
-+ virtual ~VM_RedefineClasses();
-+
-+ bool check_arguments();
- bool doit_prologue();
- void doit();
- void doit_epilogue();
-+ void rollback();
-
-- bool allow_nested_vm_operations() const { return true; }
-- jvmtiError check_error() { return _res; }
-+ jvmtiError check_exception() const;
-+ VMOp_Type type() const { return VMOp_RedefineClasses; }
-+ bool skip_operation() const { return false; }
-+ bool allow_nested_vm_operations() const { return true; }
-+ jvmtiError check_error() { return _result; }
-+
-+ void update_active_methods();
-+
-+ // Checks for type consistency after hierarchy change
-+ bool check_type_consistency();
-+ void calculate_type_check_information();
-+ bool check_field_value_types();
-+ void clear_type_check_information();
-+ bool check_method_stacks();
-+ bool check_loaded_methods();
-+ bool check_method(methodOop method);
-+ static Symbol* signature_to_class_name(Symbol* signature);
-+
-+ void method_forwarding();
-+
-+ void update_array_classes_to_newest_version(klassOop smallest_dimension);
-
- // Modifiable test must be shared between IsModifiableClass query
- // and redefine implementation
- static bool is_modifiable_class(oop klass_mirror);
-+
-+ // Method used during garbage collection, the VM operation must iterate over all oops.
-+ void oops_do(OopClosure* f);
-+
-+ // Utility methods for transferring field access flags
-+
-+ static void transfer_special_access_flags(fieldDescriptor *from, fieldDescriptor *to);
-+ static void update_klass_field_access_flag(fieldDescriptor *fd);
-+
-+ void transfer_old_native_function_registrations(instanceKlassHandle the_class);
-+
-+ void lock_threads();
-+ void unlock_threads();
-+
-+ template <class T> static void do_oop_work(T* p);
-+
-+ static void swap_marks(oop first, oop second);
-+
- };
-
- #endif // SHARE_VM_PRIMS_JVMTIREDEFINECLASSES_HPP
-diff --git a/src/share/vm/prims/methodComparator.cpp b/src/share/vm/prims/methodComparator.cpp
-index 60eaf97..07bb6e3 100644
---- a/src/share/vm/prims/methodComparator.cpp
-+++ b/src/share/vm/prims/methodComparator.cpp
-@@ -65,6 +65,7 @@
- if (! args_same(c_old, c_new))
- return false;
- }
-+
- return true;
- }
-
-diff --git a/src/share/vm/prims/nativeLookup.cpp b/src/share/vm/prims/nativeLookup.cpp
-index 41fc42d..53b3e0c 100644
---- a/src/share/vm/prims/nativeLookup.cpp
-+++ b/src/share/vm/prims/nativeLookup.cpp
-@@ -35,6 +35,7 @@
- #include "oops/symbol.hpp"
- #include "prims/jvm_misc.hpp"
- #include "prims/nativeLookup.hpp"
-+#include "prims/jvmtiRedefineClasses.hpp"
- #include "runtime/arguments.hpp"
- #include "runtime/handles.inline.hpp"
- #include "runtime/javaCalls.hpp"
-@@ -52,7 +53,6 @@
- #ifdef TARGET_OS_FAMILY_bsd
- # include "os_bsd.inline.hpp"
- #endif
--
-
- static void mangle_name_on(outputStream* st, Symbol* name, int begin, int end) {
- char* bytes = (char*)name->bytes() + begin;
-@@ -138,6 +138,40 @@
- { CC"Java_sun_hotspot_WhiteBox_registerNatives", NULL, FN_PTR(JVM_RegisterWhiteBoxMethods) },
- };
-
-+// Helper function to call redefineClasses from Java Code
-+JVM_ENTRY(int, JVM_RedefineClassesHelper(JNIEnv *env, jclass cb, jclass target, jbyteArray bytes))
-+ ResourceMark rm(THREAD);
-+
-+ JavaThread* current_thread = JavaThread::current();
-+ jbyte* bytecodes = NULL;
-+ const int class_count = 1;
-+ jvmtiClassDefinition* class_definitions = NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count);
-+
-+ {
-+ ThreadToNativeFromVM ttnfv(thread);
-+ jboolean is_copy = JNI_FALSE;
-+ bytecodes = env->GetByteArrayElements(bytes, &is_copy);
-+ class_definitions[0].klass = target;
-+ class_definitions[0].class_byte_count = env->GetArrayLength(bytes);
-+ class_definitions[0].class_bytes = (unsigned char*)bytecodes;
-+ }
-+
-+ VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
-+ VMThread::execute(&op);
-+ int result = op.check_error();
-+
-+ {
-+ ThreadToNativeFromVM ttnfv(thread);
-+ if (env->ExceptionOccurred()) {
-+ return -1;
-+ }
-+ env->ReleaseByteArrayElements(bytes, bytecodes, 0);
-+ }
-+
-+ return result;
-+JVM_END
-+
-+
- static address lookup_special_native(char* jni_name) {
- int i = !JDK_Version::is_gte_jdk14x_version() ? 0 : 2; // see comment in lookup_special_native_methods
- int count = sizeof(lookup_special_native_methods) / sizeof(JNINativeMethod);
-@@ -177,6 +211,9 @@
- return entry;
- }
- }
-+ if(strstr(jni_name, "Java_at_ssw_hotswap_ClassRedefinition_redefineClasses") != NULL) {
-+ return CAST_FROM_FN_PTR(address, JVM_RedefineClassesHelper);
-+ }
-
- // Otherwise call static method findNative in ClassLoader
- KlassHandle klass (THREAD, SystemDictionary::ClassLoader_klass());
-diff --git a/src/share/vm/runtime/arguments.cpp b/src/share/vm/runtime/arguments.cpp
-index 0496367..62e9d55 100644
---- a/src/share/vm/runtime/arguments.cpp
-+++ b/src/share/vm/runtime/arguments.cpp
-@@ -1874,6 +1874,15 @@
- status = false;
- }
-
-+ // (tw) Must use serial GC
-+ if (!UseSerialGC && i >= 1) {
-+ jio_fprintf(defaultStream::error_stream(),
-+ "Must use the serial GC in the Dynamic Code Evolution VM\n");
-+ status = false;
-+ } else {
-+ UseSerialGC = true;
-+ }
-+
- return status;
- }
-
-diff --git a/src/share/vm/runtime/deoptimization.cpp b/src/share/vm/runtime/deoptimization.cpp
-index 2b767d4..e9b6f47 100644
---- a/src/share/vm/runtime/deoptimization.cpp
-+++ b/src/share/vm/runtime/deoptimization.cpp
-@@ -599,6 +599,38 @@
- // Cleanup thread deopt data
- cleanup_deopt_info(thread, array);
-
-+ // (tw) Redefinition support: Check if we need to transfer method execution points to new versions
-+ {
-+ ResourceMark res_mark;
-+
-+ // Verify that the just-unpacked frames match the interpreter's
-+ // notions of expression stack and locals
-+ vframeArray* cur_array = thread->vframe_array_last();
-+ RegisterMap rm(thread, false);
-+ rm.set_include_argument_oops(false);
-+ for (int i = 0; i < cur_array->frames(); i++) {
-+ vframeArrayElement* el = cur_array->element(i);
-+ frame* frame = el->iframe();
-+ guarantee(frame->is_interpreted_frame(), "Wrong frame type");
-+ RegisterMap reg_map(thread);
-+ vframe* vf = vframe::new_vframe(frame, ®_map, thread);
-+ interpretedVFrame *iframe = (interpretedVFrame *)vf;
-+ methodOop method = iframe->method();
-+ int bci = iframe->bci();
-+ method = method->newest_version();
-+ iframe->set_method(method, bci);
-+
-+ methodOop forward_method = method->forward_method();
-+ if (forward_method != NULL && method->is_in_code_section(bci)) {
-+ int new_bci = method->calculate_forward_bci(bci, forward_method);
-+ if (TraceRedefineClasses >= 2) {
-+ tty->print_cr("Transferring execution of %s to new method old_bci=%d new_bci=%d", forward_method->name()->as_C_string(), bci, new_bci);
-+ }
-+ iframe->set_method(forward_method, new_bci);
-+ }
-+ }
-+ }
-+
- #ifndef PRODUCT
- if (VerifyStack) {
- ResourceMark res_mark;
-diff --git a/src/share/vm/runtime/frame.cpp b/src/share/vm/runtime/frame.cpp
-index aacd835..3772b3f 100644
---- a/src/share/vm/runtime/frame.cpp
-+++ b/src/share/vm/runtime/frame.cpp
-@@ -408,6 +408,12 @@
- *interpreter_frame_method_addr() = method;
- }
-
-+// (tw) Sets constant pool cache oop
-+void frame::interpreter_frame_set_cache(constantPoolCacheOop cp) {
-+ assert(is_interpreted_frame(), "interpreted frame expected");
-+ *interpreter_frame_cache_addr() = cp;
-+}
-+
- void frame::interpreter_frame_set_bcx(intptr_t bcx) {
- assert(is_interpreted_frame(), "Not an interpreted frame");
- if (ProfileInterpreter) {
-@@ -423,19 +429,27 @@
- // The bcx was just converted from bci to bcp.
- // Convert the mdx in parallel.
- methodDataOop mdo = interpreter_frame_method()->method_data();
-- assert(mdo != NULL, "");
-- int mdi = mdx - 1; // We distinguish valid mdi from zero by adding one.
-- address mdp = mdo->di_to_dp(mdi);
-- interpreter_frame_set_mdx((intptr_t)mdp);
-+ if (mdo == NULL) {
-+ interpreter_frame_set_mdx(0);
-+ } else {
-+ assert(mdo != NULL, "");
-+ int mdi = mdx - 1; // We distinguish valid mdi from zero by adding one.
-+ address mdp = mdo->di_to_dp(mdi);
-+ interpreter_frame_set_mdx((intptr_t)mdp);
-+ }
- }
- } else {
- if (is_now_bci) {
- // The bcx was just converted from bcp to bci.
- // Convert the mdx in parallel.
- methodDataOop mdo = interpreter_frame_method()->method_data();
-- assert(mdo != NULL, "");
-- int mdi = mdo->dp_to_di((address)mdx);
-- interpreter_frame_set_mdx((intptr_t)mdi + 1); // distinguish valid from 0.
-+ if (mdo == NULL) {
-+ interpreter_frame_set_mdx(0);
-+ } else {
-+ assert(mdo != NULL, "");
-+ int mdi = mdo->dp_to_di((address)mdx);
-+ interpreter_frame_set_mdx((intptr_t)mdi + 1); // distinguish valid from 0.
-+ }
- }
- }
- }
-diff --git a/src/share/vm/runtime/frame.hpp b/src/share/vm/runtime/frame.hpp
-index 9c7bb72..04a6595 100644
---- a/src/share/vm/runtime/frame.hpp
-+++ b/src/share/vm/runtime/frame.hpp
-@@ -346,6 +346,7 @@
- // Method & constant pool cache
- methodOop interpreter_frame_method() const;
- void interpreter_frame_set_method(methodOop method);
-+ void interpreter_frame_set_cache(constantPoolCacheOop method);
- methodOop* interpreter_frame_method_addr() const;
- constantPoolCacheOop* interpreter_frame_cache_addr() const;
- #ifdef PPC
-diff --git a/src/share/vm/runtime/globals.hpp b/src/share/vm/runtime/globals.hpp
-index 0731ca0..cbd6eca 100644
---- a/src/share/vm/runtime/globals.hpp
-+++ b/src/share/vm/runtime/globals.hpp
-@@ -1229,9 +1229,23 @@
- product(bool, StressLdcRewrite, false, \
- "Force ldc -> ldc_w rewrite during RedefineClasses") \
- \
-+ product(bool, UseMethodForwardPoints, false, \
-+ "Use method forward points") \
-+ \
-+ product(intx, MethodForwardPointsMaxLocals, 300, \
-+ "Maximum number of locals in forwarding method") \
-+ \
-+ product(intx, MethodForwardPointsMaxStack, 300, \
-+ "Maximum number of stack slots in forwarding method") \
-+ \
- product(intx, TraceRedefineClasses, 0, \
- "Trace level for JVMTI RedefineClasses") \
- \
-+ product(bool, TimeRedefineClasses, false, \
-+ "Measure timing for JVMTI RedefineClasses") \
-+ \
-+ product(bool, AllowAdvancedClassRedefinition, true, \
-+ "Allow advanced class redefinition beyond swapping method bodies")\
- develop(bool, StressMethodComparator, false, \
- "run the MethodComparator on all loaded methods") \
- \
-diff --git a/src/share/vm/runtime/interfaceSupport.hpp b/src/share/vm/runtime/interfaceSupport.hpp
-index 2875ee0..61fd8fe 100644
---- a/src/share/vm/runtime/interfaceSupport.hpp
-+++ b/src/share/vm/runtime/interfaceSupport.hpp
-@@ -296,7 +296,7 @@
- ThreadToNativeFromVM(JavaThread *thread) : ThreadStateTransition(thread) {
- // We are leaving the VM at this point and going directly to native code.
- // Block, if we are in the middle of a safepoint synchronization.
-- assert(!thread->owns_locks(), "must release all locks when leaving VM");
-+ assert(!thread->owns_locks_but_redefine_classes_lock(), "must release all locks when leaving VM");
- thread->frame_anchor()->make_walkable(thread);
- trans_and_fence(_thread_in_vm, _thread_in_native);
- // Check for pending. async. exceptions or suspends.
-diff --git a/src/share/vm/runtime/javaCalls.cpp b/src/share/vm/runtime/javaCalls.cpp
-index edbba98..4a27925 100644
---- a/src/share/vm/runtime/javaCalls.cpp
-+++ b/src/share/vm/runtime/javaCalls.cpp
-@@ -60,7 +60,7 @@
- bool clear_pending_exception = true;
-
- guarantee(thread->is_Java_thread(), "crucial check - the VM thread cannot and must not escape to Java code");
-- assert(!thread->owns_locks(), "must release all locks when leaving VM");
-+ assert(!thread->owns_locks_but_redefine_classes_lock(), "must release all locks when leaving VM");
- guarantee(!thread->is_Compiler_thread(), "cannot make java calls from the compiler");
- _result = result;
-
-diff --git a/src/share/vm/runtime/jniHandles.cpp b/src/share/vm/runtime/jniHandles.cpp
-index 3cbcaca..30839d7 100644
---- a/src/share/vm/runtime/jniHandles.cpp
-+++ b/src/share/vm/runtime/jniHandles.cpp
-@@ -112,6 +112,10 @@
- }
-
- jmethodID JNIHandles::make_jmethod_id(methodHandle mh) {
-+ if (mh->newest_version() != mh()) {
-+ methodHandle mh_new(Thread::current(), mh()->newest_version());
-+ return (jmethodID) make_weak_global(mh_new);
-+ }
- return (jmethodID) make_weak_global(mh);
- }
-
-diff --git a/src/share/vm/runtime/mutex.cpp b/src/share/vm/runtime/mutex.cpp
-index 2095237..c541434 100644
---- a/src/share/vm/runtime/mutex.cpp
-+++ b/src/share/vm/runtime/mutex.cpp
-@@ -1227,7 +1227,7 @@
- // in increasing rank order (modulo any native ranks)
- for (tmp = locks; tmp != NULL; tmp = tmp->next()) {
- if (tmp->next() != NULL) {
-- assert(tmp->rank() == Mutex::native ||
-+ assert(tmp->rank() == Mutex::native || tmp->rank() == Mutex::redefine_classes ||
- tmp->rank() <= tmp->next()->rank(), "mutex rank anomaly?");
- }
- }
-@@ -1247,7 +1247,7 @@
- // in increasing rank order (modulo any native ranks)
- for (tmp = locks; tmp != NULL; tmp = tmp->next()) {
- if (tmp->next() != NULL) {
-- assert(tmp->rank() == Mutex::native ||
-+ assert(tmp->rank() == Mutex::native || tmp->rank() == Mutex::redefine_classes ||
- tmp->rank() <= tmp->next()->rank(), "mutex rank anomaly?");
- }
- }
-@@ -1310,6 +1310,7 @@
- // already hold Terminator_lock - may happen because of periodic safepoints
- if (this->rank() != Mutex::native &&
- this->rank() != Mutex::suspend_resume &&
-+ this->rank() != Mutex::redefine_classes &&
- locks != NULL && locks->rank() <= this->rank() &&
- !SafepointSynchronize::is_at_safepoint() &&
- this != Interrupt_lock &&
-diff --git a/src/share/vm/runtime/mutex.hpp b/src/share/vm/runtime/mutex.hpp
-index 7d2cd82..11eb32e 100644
---- a/src/share/vm/runtime/mutex.hpp
-+++ b/src/share/vm/runtime/mutex.hpp
-@@ -109,7 +109,8 @@
- barrier = safepoint + 1,
- nonleaf = barrier + 1,
- max_nonleaf = nonleaf + 900,
-- native = max_nonleaf + 1
-+ native = max_nonleaf + 1,
-+ redefine_classes = native + 1
- };
-
- // The WaitSet and EntryList linked lists are composed of ParkEvents.
-diff --git a/src/share/vm/runtime/mutexLocker.cpp b/src/share/vm/runtime/mutexLocker.cpp
-index 77fddef..9d453d4 100644
---- a/src/share/vm/runtime/mutexLocker.cpp
-+++ b/src/share/vm/runtime/mutexLocker.cpp
-@@ -49,6 +49,7 @@
- // Consider using GCC's __read_mostly.
-
- Mutex* Patching_lock = NULL;
-+Mutex* RedefineClasses_lock = NULL;
- Monitor* SystemDictionary_lock = NULL;
- Mutex* PackageTable_lock = NULL;
- Mutex* CompiledIC_lock = NULL;
-@@ -91,6 +92,7 @@
- Mutex* DirtyCardQ_FL_lock = NULL;
- Monitor* DirtyCardQ_CBL_mon = NULL;
- Mutex* Shared_DirtyCardQ_lock = NULL;
-+Monitor* RedefinitionSync_lock = NULL;
- Mutex* ParGCRareEvent_lock = NULL;
- Mutex* EvacFailureStack_lock = NULL;
- Mutex* DerivedPointerTableGC_lock = NULL;
-@@ -208,6 +210,7 @@
- def(HotCardCache_lock , Mutex , special , true );
- def(EvacFailureStack_lock , Mutex , nonleaf , true );
- }
-+ def(RedefinitionSync_lock , Monitor , leaf , false );
- def(ParGCRareEvent_lock , Mutex , leaf , true );
- def(DerivedPointerTableGC_lock , Mutex, leaf, true );
- def(CodeCache_lock , Mutex , special, true );
-@@ -283,6 +286,7 @@
- def(Debug3_lock , Mutex , nonleaf+4, true );
- def(CompileThread_lock , Monitor, nonleaf+5, false);
- def(PeriodicTask_lock , Monitor, nonleaf+5, true);
-+ def(RedefineClasses_lock , Mutex , nonleaf+7, false ); // for ensuring that class redefinition is not done in parallel
-
- #ifdef INCLUDE_TRACE
- def(JfrMsg_lock , Monitor, leaf, true);
-diff --git a/src/share/vm/runtime/mutexLocker.hpp b/src/share/vm/runtime/mutexLocker.hpp
-index a6549b1..089ed11 100644
---- a/src/share/vm/runtime/mutexLocker.hpp
-+++ b/src/share/vm/runtime/mutexLocker.hpp
-@@ -43,6 +43,8 @@
- // Mutexes used in the VM.
-
- extern Mutex* Patching_lock; // a lock used to guard code patching of compiled code
-+extern Monitor* RedefinitionSync_lock; // a lock on synchronized class redefinition
-+extern Mutex* RedefineClasses_lock; // a lock on class redefinition
- extern Monitor* SystemDictionary_lock; // a lock on the system dictonary
- extern Mutex* PackageTable_lock; // a lock on the class loader package table
- extern Mutex* CompiledIC_lock; // a lock used to guard compiled IC patching and access
-diff --git a/src/share/vm/runtime/reflection.cpp b/src/share/vm/runtime/reflection.cpp
-index 1665d93..6baabba 100644
---- a/src/share/vm/runtime/reflection.cpp
-+++ b/src/share/vm/runtime/reflection.cpp
-@@ -468,7 +468,8 @@
- // sun/reflect/MagicAccessorImpl subclasses to succeed trivially.
- if ( JDK_Version::is_gte_jdk14x_version()
- && UseNewReflection
-- && Klass::cast(current_class)->is_subclass_of(SystemDictionary::reflect_MagicAccessorImpl_klass())) {
-+ && (Klass::cast(current_class)->is_subclass_of(SystemDictionary::reflect_MagicAccessorImpl_klass()) ||
-+ Klass::cast(current_class)->is_subclass_of(SystemDictionary::reflect_MagicAccessorImpl_klass()->klass_part()->newest_version()))) {
- return true;
- }
-
-@@ -519,6 +520,12 @@
- AccessFlags access,
- bool classloader_only,
- bool protected_restriction) {
-+
-+ // (tw) Decide accessibility based on active version
-+ if (current_class != NULL) {
-+ current_class = current_class->klass_part()->active_version();
-+ }
-+
- // Verify that current_class can access a field of field_class, where that
- // field's access bits are "access". We assume that we've already verified
- // that current_class can access field_class.
-@@ -560,7 +567,8 @@
- // sun/reflect/MagicAccessorImpl subclasses to succeed trivially.
- if ( JDK_Version::is_gte_jdk14x_version()
- && UseNewReflection
-- && Klass::cast(current_class)->is_subclass_of(SystemDictionary::reflect_MagicAccessorImpl_klass())) {
-+ && (Klass::cast(current_class)->is_subclass_of(SystemDictionary::reflect_MagicAccessorImpl_klass()) ||
-+ Klass::cast(current_class)->is_subclass_of(SystemDictionary::reflect_MagicAccessorImpl_klass()->klass_part()->newest_version()))) {
- return true;
- }
-
-diff --git a/src/share/vm/runtime/sharedRuntime.cpp b/src/share/vm/runtime/sharedRuntime.cpp
-index 709d783..e0e19b1 100644
---- a/src/share/vm/runtime/sharedRuntime.cpp
-+++ b/src/share/vm/runtime/sharedRuntime.cpp
-@@ -1137,7 +1137,20 @@
- if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
- int retry_count = 0;
- while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
-- callee_method->method_holder() != SystemDictionary::Object_klass()) {
-+ callee_method->method_holder()->klass_part()->newest_version() != SystemDictionary::Object_klass()->klass_part()->newest_version()) {
-+
-+ // DCEVM: If we are executing an old method, this is OK!
-+ {
-+ ResourceMark rm(thread);
-+ RegisterMap cbl_map(thread, false);
-+ frame caller_frame = thread->last_frame().sender(&cbl_map);
-+
-+ CodeBlob* caller_cb = caller_frame.cb();
-+ guarantee(caller_cb != NULL && caller_cb->is_nmethod(), "must be called from nmethod");
-+ nmethod* caller_nm = caller_cb->as_nmethod_or_null();
-+ if (caller_nm->method()->is_old()) break;
-+ }
-+
- // If has a pending exception then there is no need to re-try to
- // resolve this method.
- // If the method has been redefined, we need to try again.
-diff --git a/src/share/vm/runtime/thread.cpp b/src/share/vm/runtime/thread.cpp
-index f3acf4d..ea61cae 100644
---- a/src/share/vm/runtime/thread.cpp
-+++ b/src/share/vm/runtime/thread.cpp
-@@ -216,6 +216,8 @@
- set_self_raw_id(0);
- set_lgrp_id(-1);
-
-+ _redefine_classes_mutex = new Mutex(Mutex::redefine_classes, "redefine classes lock", false);
-+
- // allocated data structures
- set_osthread(NULL);
- set_resource_area(new (mtThread)ResourceArea());
-@@ -249,6 +251,7 @@
- omFreeProvision = 32 ;
- omInUseList = NULL ;
- omInUseCount = 0 ;
-+ _pretend_new_universe = false;
-
- #ifdef ASSERT
- _visited_for_critical_count = false;
-@@ -880,6 +883,15 @@
- bool Thread::owns_locks_but_compiled_lock() const {
- for(Monitor *cur = _owned_locks; cur; cur = cur->next()) {
- if (cur != Compile_lock) return true;
-+ }
-+ return false;
-+}
-+
-+bool Thread::owns_locks_but_redefine_classes_lock() const {
-+ for(Monitor *cur = _owned_locks; cur; cur = cur->next()) {
-+ if (cur != RedefineClasses_lock && cur->rank() != Mutex::redefine_classes) {
-+ return true;
-+ }
- }
- return false;
- }
-@@ -1637,7 +1649,7 @@
- ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm);
-
- assert(JavaThread::current() == this, "sanity check");
-- assert(!Thread::current()->owns_locks(), "sanity check");
-+ assert(!Thread::current()->owns_locks_but_redefine_classes_lock(), "sanity check");
-
- DTRACE_THREAD_PROBE(start, this);
-
-@@ -3193,7 +3205,7 @@
-
- // Create a CompilerThread
- CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters)
--: JavaThread(&compiler_thread_entry) {
-+: JavaThread(&compiler_thread_entry), _should_bailout(false) {
- _env = NULL;
- _log = NULL;
- _task = NULL;
-@@ -3201,6 +3213,7 @@
- _counters = counters;
- _buffer_blob = NULL;
- _scanned_nmethod = NULL;
-+ _compilation_mutex = new Mutex(Mutex::redefine_classes, "compilationMutex", false);
-
- #ifndef PRODUCT
- _ideal_graph_printer = NULL;
-@@ -3230,6 +3243,7 @@
- int Threads::_number_of_non_daemon_threads = 0;
- int Threads::_return_code = 0;
- size_t JavaThread::_stack_size_at_create = 0;
-+bool Threads::_wait_at_instrumentation_entry = false;
-
- // All JavaThreads
- #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next())
-diff --git a/src/share/vm/runtime/thread.hpp b/src/share/vm/runtime/thread.hpp
-index 774bd27..4ca4502 100644
---- a/src/share/vm/runtime/thread.hpp
-+++ b/src/share/vm/runtime/thread.hpp
-@@ -203,10 +203,13 @@
- void enter_signal_handler() { _num_nested_signal++; }
- void leave_signal_handler() { _num_nested_signal--; }
- bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
-+ Mutex* redefine_classes_mutex() { return _redefine_classes_mutex; }
-
- private:
- // Debug tracing
- static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
-+
-+ Mutex* _redefine_classes_mutex;
-
- // Active_handles points to a block of handles
- JNIHandleBlock* _active_handles;
-@@ -530,10 +533,15 @@
- uintptr_t _self_raw_id; // used by get_thread (mutable)
- int _lgrp_id;
-
-+
-+ bool _pretend_new_universe;
-+
- public:
- // Stack overflow support
- address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
-
-+ void set_pretend_new_universe(bool b) { if (_pretend_new_universe != b) { if (TraceRedefineClasses >= 5) tty->print_cr("Changing pretend universe to %d", (int)b); _pretend_new_universe = b; } }
-+ bool pretend_new_universe() { return _pretend_new_universe; }
- void set_stack_base(address base) { _stack_base = base; }
- size_t stack_size() const { return _stack_size; }
- void set_stack_size(size_t size) { _stack_size = size; }
-@@ -570,6 +578,7 @@
- void print_owned_locks() const { print_owned_locks_on(tty); }
- Monitor* owned_locks() const { return _owned_locks; }
- bool owns_locks() const { return owned_locks() != NULL; }
-+ bool owns_locks_but_redefine_classes_lock() const;
- bool owns_locks_but_compiled_lock() const;
-
- // Deadlock detection
-@@ -1793,6 +1802,8 @@
- CompileTask* _task;
- CompileQueue* _queue;
- BufferBlob* _buffer_blob;
-+ bool _should_bailout;
-+ Mutex* _compilation_mutex;
-
- nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
-
-@@ -1802,12 +1813,16 @@
-
- CompilerThread(CompileQueue* queue, CompilerCounters* counters);
-
-+ bool should_bailout() const { return _should_bailout; }
-+ void set_should_bailout(bool b) { _should_bailout = false; }
-+
- bool is_Compiler_thread() const { return true; }
- // Hide this compiler thread from external view.
- bool is_hidden_from_external_view() const { return true; }
-
- CompileQueue* queue() { return _queue; }
- CompilerCounters* counters() { return _counters; }
-+ Mutex *compilation_mutex() { return _compilation_mutex; }
-
- // Get/set the thread's compilation environment.
- ciEnv* env() { return _env; }
-@@ -1862,6 +1877,7 @@
- static int _number_of_threads;
- static int _number_of_non_daemon_threads;
- static int _return_code;
-+ static bool _wait_at_instrumentation_entry;
-
- public:
- // Thread management
-@@ -1873,6 +1889,9 @@
- static JavaThread* first() { return _thread_list; }
- static void threads_do(ThreadClosure* tc);
-
-+ static bool wait_at_instrumentation_entry() { return _wait_at_instrumentation_entry; }
-+ static void set_wait_at_instrumentation_entry(bool b) { _wait_at_instrumentation_entry = b; }
-+
- // Initializes the vm and creates the vm thread
- static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
- static void convert_vm_init_libraries_to_agents();
-diff --git a/src/share/vm/runtime/vframe.cpp b/src/share/vm/runtime/vframe.cpp
-index 09e324f..d47ffef 100644
---- a/src/share/vm/runtime/vframe.cpp
-+++ b/src/share/vm/runtime/vframe.cpp
-@@ -253,6 +253,46 @@
- return fr().interpreter_frame_method();
- }
-
-+// (tw) Sets interpreter frame method.
-+void interpretedVFrame::set_method(methodOop new_method, int new_bci) {
-+ methodOop old_method = fr().interpreter_frame_method();
-+ int old_stack_size = fr().interpreter_frame_expression_stack_size();
-+ if (old_method == new_method) return;
-+ u_char *old_bcp = bcp();
-+ int old_bci = bci();
-+ fr().interpreter_frame_set_method(new_method);
-+ fr().interpreter_frame_set_cache(new_method->constants()->cache());
-+ u_char *new_bcp = new_method->code_base() + new_bci;
-+ assert(new_method->bcp_from(new_bci) == new_bcp, "");
-+
-+ set_bcp(new_bcp);
-+
-+ Bytecodes::Code code = Bytecodes::java_code_at(old_method, old_bcp);
-+ assert(Bytecodes::java_code_at(new_method, new_bcp) == code, "must have same bytecode at this position");
-+
-+ switch (code) {
-+ case Bytecodes::_invokevirtual :
-+ case Bytecodes::_invokespecial :
-+ case Bytecodes::_invokestatic :
-+ case Bytecodes::_invokeinterface: {
-+ int old_index = Bytes::get_native_u2(old_bcp+1);
-+ int new_index = Bytes::get_native_u2(new_bcp+1);
-+ new_method->constants()->cache()->entry_at(new_index)->copy_from(old_method->constants()->cache()->entry_at(old_index));
-+ break;
-+ }
-+
-+ case Bytecodes::_invokedynamic: {
-+ int old_index = Bytes::get_native_u4(old_bcp+1);
-+ int new_index = Bytes::get_native_u4(new_bcp+1);
-+ new_method->constants()->cache()->secondary_entry_at(new_index)->copy_from(old_method->constants()->cache()->secondary_entry_at(old_index));
-+ break;
-+ }
-+ }
-+
-+ int new_stack_size = fr().interpreter_frame_expression_stack_size();
-+ assert(new_method->validate_bci_from_bcx((intptr_t)new_bcp) == new_bci, "");
-+}
-+
- StackValueCollection* interpretedVFrame::locals() const {
- int length = method()->max_locals();
-
-diff --git a/src/share/vm/runtime/vframe.hpp b/src/share/vm/runtime/vframe.hpp
-index badfea5..edbc5c7 100644
---- a/src/share/vm/runtime/vframe.hpp
-+++ b/src/share/vm/runtime/vframe.hpp
-@@ -163,6 +163,7 @@
- StackValueCollection* locals() const;
- StackValueCollection* expressions() const;
- GrowableArray<MonitorInfo*>* monitors() const;
-+ void set_method(methodOop method, int new_bci);
-
- void set_locals(StackValueCollection* values) const;
-
-diff --git a/src/share/vm/runtime/vmThread.cpp b/src/share/vm/runtime/vmThread.cpp
-index 0a3e0da..3d294e1 100644
---- a/src/share/vm/runtime/vmThread.cpp
-+++ b/src/share/vm/runtime/vmThread.cpp
-@@ -694,6 +694,10 @@
- void VMThread::oops_do(OopClosure* f, CodeBlobClosure* cf) {
- Thread::oops_do(f, cf);
- _vm_queue->oops_do(f);
-+ // (DCEVM) need to update oops in VM_RedefineClasses!
-+ if (_cur_vm_operation != NULL) {
-+ _cur_vm_operation->oops_do(f);
-+ }
- }
-
- //------------------------------------------------------------------------------------------------------------------
-diff --git a/src/share/vm/utilities/exceptions.cpp b/src/share/vm/utilities/exceptions.cpp
-index 03f254d..c9e0efc 100644
---- a/src/share/vm/utilities/exceptions.cpp
-+++ b/src/share/vm/utilities/exceptions.cpp
-@@ -254,6 +254,8 @@
- assert(thread->is_Java_thread(), "can only be called by a Java thread");
- assert(!thread->has_pending_exception(), "already has exception");
-
-+ bool old_pretend_value = Thread::current()->pretend_new_universe();
-+ Thread::current()->set_pretend_new_universe(false);
- Handle h_exception;
-
- // Resolve exception klass
-@@ -285,6 +287,7 @@
- h_exception = Handle(thread, thread->pending_exception());
- thread->clear_pending_exception();
- }
-+ Thread::current()->set_pretend_new_universe(old_pretend_value);
- return h_exception;
- }
-
-@@ -295,6 +298,8 @@
- Symbol* signature, JavaCallArguments *args,
- Handle h_cause,
- Handle h_loader, Handle h_protection_domain) {
-+ bool old_pretend_value = Thread::current()->pretend_new_universe();
-+ Thread::current()->set_pretend_new_universe(false);
- Handle h_exception = new_exception(thread, name, signature, args, h_loader, h_protection_domain);
-
- // Future: object initializer should take a cause argument
-@@ -317,6 +322,8 @@
- h_exception = Handle(thread, thread->pending_exception());
- thread->clear_pending_exception();
- }
-+
-+ Thread::current()->set_pretend_new_universe(old_pretend_value);
- return h_exception;
- }
-
-diff --git a/src/share/vm/utilities/growableArray.hpp b/src/share/vm/utilities/growableArray.hpp
-index ea92a80..05e940e 100644
---- a/src/share/vm/utilities/growableArray.hpp
-+++ b/src/share/vm/utilities/growableArray.hpp
-@@ -145,6 +145,33 @@
- assert(on_stack(), "fast ResourceObj path only");
- return (void*)resource_allocate_bytes(thread, elementSize * _max);
- }
-+
-+};
-+
-+template<class E, class F> class Pair : public StackObj
-+{
-+private:
-+ E _left;
-+ F _right;
-+
-+public:
-+
-+ Pair() {
-+
-+ }
-+
-+ Pair(E left, F right) {
-+ this->_left = left;
-+ this->_right = right;
-+ }
-+
-+ E left() {
-+ return _left;
-+ }
-+
-+ F right() {
-+ return _right;
-+ }
- };
-
- template<class E> class GrowableArray : public GenericGrowableArray {
\ No newline at end of file
--- /dev/null
+# HG changeset patch
+# Parent 2ffb90b422e20ff948d25b96bfb9be923c130734
+
+diff -r 2ffb90b422e2 src/share/vm/classfile/javaClasses.cpp
+--- a/src/share/vm/classfile/javaClasses.cpp Fri Jul 10 10:19:24 2015 -0700
++++ b/src/share/vm/classfile/javaClasses.cpp Fri Jul 10 10:19:37 2015 -0700
+@@ -2409,6 +2409,52 @@
+ }
+ }
+
++// Support for java_lang_invoke_DirectMethodHandle$StaticAccessor
++
++int java_lang_invoke_DirectMethodHandle_StaticAccessor::_static_offset_offset;
++
++long java_lang_invoke_DirectMethodHandle_StaticAccessor::static_offset(oop dmh) {
++ assert(_static_offset_offset != 0, "");
++ return dmh->long_field(_static_offset_offset);
++}
++
++void java_lang_invoke_DirectMethodHandle_StaticAccessor::set_static_offset(oop dmh, long static_offset) {
++ assert(_static_offset_offset != 0, "");
++ dmh->long_field_put(_static_offset_offset, static_offset);
++}
++
++
++void java_lang_invoke_DirectMethodHandle_StaticAccessor::compute_offsets() {
++ klassOop klass_oop = SystemDictionary::DirectMethodHandle_StaticAccessor_klass();
++ if (klass_oop != NULL && EnableInvokeDynamic) {
++ compute_offset(_static_offset_offset, klass_oop, vmSymbols::static_offset_name(), vmSymbols::long_signature());
++ }
++}
++
++// Support for java_lang_invoke_DirectMethodHandle$Accessor
++
++int java_lang_invoke_DirectMethodHandle_Accessor::_field_offset_offset;
++
++int java_lang_invoke_DirectMethodHandle_Accessor::field_offset(oop dmh) {
++ assert(_field_offset_offset != 0, "");
++ return dmh->int_field(_field_offset_offset);
++}
++
++void java_lang_invoke_DirectMethodHandle_Accessor::set_field_offset(oop dmh, int field_offset) {
++ assert(_field_offset_offset != 0, "");
++ dmh->int_field_put(_field_offset_offset, field_offset);
++}
++
++
++void java_lang_invoke_DirectMethodHandle_Accessor::compute_offsets() {
++ klassOop klass_oop = SystemDictionary::DirectMethodHandle_Accessor_klass();
++ if (klass_oop != NULL && EnableInvokeDynamic) {
++ compute_offset(_field_offset_offset, klass_oop, vmSymbols::field_offset_name(), vmSymbols::int_signature());
++ }
++}
++
++
++
+ // Support for java_lang_invoke_MethodHandle
+
+ int java_lang_invoke_MethodHandle::_type_offset;
+@@ -3028,6 +3074,8 @@
+ if (EnableInvokeDynamic) {
+ java_lang_invoke_MethodHandle::compute_offsets();
+ java_lang_invoke_DirectMethodHandle::compute_offsets();
++ java_lang_invoke_DirectMethodHandle_StaticAccessor::compute_offsets();
++ java_lang_invoke_DirectMethodHandle_Accessor::compute_offsets();
+ java_lang_invoke_MemberName::compute_offsets();
+ java_lang_invoke_LambdaForm::compute_offsets();
+ java_lang_invoke_MethodType::compute_offsets();
+diff -r 2ffb90b422e2 src/share/vm/classfile/javaClasses.hpp
+--- a/src/share/vm/classfile/javaClasses.hpp Fri Jul 10 10:19:24 2015 -0700
++++ b/src/share/vm/classfile/javaClasses.hpp Fri Jul 10 10:19:37 2015 -0700
+@@ -940,6 +940,54 @@
+ static int member_offset_in_bytes() { return _member_offset; }
+ };
+
++// Interface to java.lang.invoke.DirectMethodHandle$StaticAccessor objects
++
++class java_lang_invoke_DirectMethodHandle_StaticAccessor: AllStatic {
++ friend class JavaClasses;
++
++ private:
++ static int _static_offset_offset; // offset to static field
++
++ static void compute_offsets();
++
++ public:
++ // Accessors
++ static long static_offset(oop dmh);
++ static void set_static_offset(oop dmh, long value);
++
++ // Testers
++ static bool is_subclass(klassOop klass) {
++ return Klass::cast(klass)->is_subclass_of(SystemDictionary::DirectMethodHandle_StaticAccessor_klass());
++ }
++ static bool is_instance(oop obj) {
++ return obj != NULL && is_subclass(obj->klass());
++ }
++};
++
++// Interface to java.lang.invoke.DirectMethodHandle$Accessor objects
++
++class java_lang_invoke_DirectMethodHandle_Accessor: AllStatic {
++ friend class JavaClasses;
++
++ private:
++ static int _field_offset_offset; // offset to field
++
++ static void compute_offsets();
++
++ public:
++ // Accessors
++ static int field_offset(oop dmh);
++ static void set_field_offset(oop dmh, int value);
++
++ // Testers
++ static bool is_subclass(klassOop klass) {
++ return Klass::cast(klass)->is_subclass_of(SystemDictionary::DirectMethodHandle_Accessor_klass());
++ }
++ static bool is_instance(oop obj) {
++ return obj != NULL && is_subclass(obj->klass());
++ }
++};
++
+ // Interface to java.lang.invoke.LambdaForm objects
+ // (These are a private interface for managing adapter code generation.)
+
+diff -r 2ffb90b422e2 src/share/vm/classfile/systemDictionary.hpp
+--- a/src/share/vm/classfile/systemDictionary.hpp Fri Jul 10 10:19:24 2015 -0700
++++ b/src/share/vm/classfile/systemDictionary.hpp Fri Jul 10 10:19:37 2015 -0700
+@@ -148,6 +148,8 @@
+ do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \
+ \
+ /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
++ do_klass(DirectMethodHandle_StaticAccessor_klass, java_lang_invoke_DirectMethodHandle_StaticAccessor, Opt ) \
++ do_klass(DirectMethodHandle_Accessor_klass, java_lang_invoke_DirectMethodHandle_Accessor, Opt ) \
+ do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292 ) \
+ do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292 ) \
+ do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292 ) \
+diff -r 2ffb90b422e2 src/share/vm/classfile/vmSymbols.hpp
+--- a/src/share/vm/classfile/vmSymbols.hpp Fri Jul 10 10:19:24 2015 -0700
++++ b/src/share/vm/classfile/vmSymbols.hpp Fri Jul 10 10:19:37 2015 -0700
+@@ -248,6 +248,8 @@
+ /* Support for JSR 292 & invokedynamic (JDK 1.7 and above) */ \
+ template(java_lang_invoke_CallSite, "java/lang/invoke/CallSite") \
+ template(java_lang_invoke_ConstantCallSite, "java/lang/invoke/ConstantCallSite") \
++ template(java_lang_invoke_DirectMethodHandle_StaticAccessor, "java/lang/invoke/DirectMethodHandle$StaticAccessor") \
++ template(java_lang_invoke_DirectMethodHandle_Accessor, "java/lang/invoke/DirectMethodHandle$Accessor") \
+ template(java_lang_invoke_DirectMethodHandle, "java/lang/invoke/DirectMethodHandle") \
+ template(java_lang_invoke_MutableCallSite, "java/lang/invoke/MutableCallSite") \
+ template(java_lang_invoke_VolatileCallSite, "java/lang/invoke/VolatileCallSite") \
+@@ -485,6 +487,10 @@
+ template(int_StringBuffer_signature, "(I)Ljava/lang/StringBuffer;") \
+ template(char_StringBuffer_signature, "(C)Ljava/lang/StringBuffer;") \
+ template(int_String_signature, "(I)Ljava/lang/String;") \
++ template(static_offset_name, "staticOffset") \
++ template(static_base_name, "staticBase") \
++ template(field_offset_name, "fieldOffset") \
++ template(field_type_name, "fieldType") \
+ /* signature symbols needed by intrinsics */ \
+ VM_INTRINSICS_DO(VM_INTRINSIC_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, template, VM_ALIAS_IGNORE) \
+ \
+diff -r 2ffb90b422e2 src/share/vm/prims/jvmtiRedefineClasses.cpp
+--- a/src/share/vm/prims/jvmtiRedefineClasses.cpp Fri Jul 10 10:19:24 2015 -0700
++++ b/src/share/vm/prims/jvmtiRedefineClasses.cpp Fri Jul 10 10:19:37 2015 -0700
+@@ -2110,6 +2110,120 @@
+
+ }
+
++// import java_lang_invoke_MemberName.*
++enum {
++ REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
++ REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
++};
++
++static oop field_name_or_null(Symbol* s) {
++ if (s == NULL) return NULL;
++ return StringTable::lookup(s);
++}
++
++static oop object_java_mirror() {
++ return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
++}
++
++static oop field_signature_type_or_null(Symbol* s) {
++ if (s == NULL) return NULL;
++ BasicType bt = FieldType::basic_type(s);
++ if (is_java_primitive(bt)) {
++ assert(s->utf8_length() == 1, "");
++ return java_lang_Class::primitive_mirror(bt);
++ }
++ // Here are some more short cuts for common types.
++ // They are optional, since reference types can be resolved lazily.
++ if (bt == T_OBJECT) {
++ if (s == vmSymbols::object_signature()) {
++ return object_java_mirror();
++ } else if (s == vmSymbols::class_signature()) {
++ return Klass::cast(SystemDictionary::Class_klass())->java_mirror();
++ } else if (s == vmSymbols::string_signature()) {
++ return Klass::cast(SystemDictionary::String_klass())->java_mirror();
++ }
++ }
++ return NULL;
++}
++
++bool update_member_name(oop obj) {
++ int flags = java_lang_invoke_MemberName::flags(obj);
++ int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
++ if (MethodHandles::ref_kind_is_method(ref_kind)) {
++ methodOop m = (methodOop) java_lang_invoke_MemberName::vmtarget(obj);
++ if (m != NULL && !instanceKlass::cast(m->method_holder())->is_newest_version()) {
++ // Let's try to re-resolve method
++ KlassHandle newest = instanceKlass::cast(m->method_holder())->newest_version();
++ methodOop new_method = instanceKlass::cast(newest())->find_method(m->name(), m->signature());
++
++ // Note: we might set NULL at this point, which should force AbstractMethodError at runtime
++ bool do_dispatch = (ref_kind != JVM_REF_invokeSpecial);
++ MethodHandles::init_method_MemberName(obj, new_method, do_dispatch, newest);
++ }
++ } else if (MethodHandles::ref_kind_is_field(ref_kind)) {
++ klassOop k = (klassOop) java_lang_invoke_MemberName::vmtarget(obj);
++ if (k == NULL) {
++ return false; // Was cleared before, this MemberName is invalid.
++ }
++
++ if (k != NULL && !Klass::cast(k)->is_newest_version()) {
++ // Let's try to re-resolve field
++ fieldDescriptor fd;
++ int offset = java_lang_invoke_MemberName::vmindex(obj);
++ bool is_static = MethodHandles::ref_kind_is_static(ref_kind);
++ instanceKlass *ik = instanceKlass::cast(k);
++ if (ik->find_local_field_from_offset(offset, is_static, &fd)) {
++ KlassHandle newest = Klass::cast(k)->newest_version();
++ fieldDescriptor fd_new;
++ if (instanceKlass::cast(newest())->find_local_field(fd.name(), fd.signature(), &fd_new)) {
++ bool is_setter = MethodHandles::ref_kind_is_setter(ref_kind);
++ oop type = field_signature_type_or_null(fd_new.signature());
++ oop name = field_name_or_null(fd_new.name());
++ MethodHandles::init_field_MemberName(obj, newest, fd_new.access_flags(), type, name, fd_new.offset(), is_setter);
++ } else {
++ // Matching field is not found in new version, not much we can do here.
++ // JVM will crash once faulty MH is invoked.
++ // However, to avoid that all DMH's using this faulty MH are cleared (set to NULL)
++ // Eventually, we probably want to replace them with something more meaningful,
++ // like instance throwing NoSuchFieldError or DMH that will resort to dynamic
++ // field resolution (with possibility of type conversion)
++ java_lang_invoke_MemberName::set_vmtarget(obj, NULL);
++ java_lang_invoke_MemberName::set_vmindex(obj, 0);
++ return false;
++ }
++ }
++ }
++ }
++ return true;
++}
++
++bool update_direct_method_handle(oop obj) {
++ // Always update member name first.
++ oop mem_name = java_lang_invoke_DirectMethodHandle::member(obj);
++ if (!update_member_name(mem_name)) {
++ return false;
++ }
++
++ // Here we rely on DirectMethodHandle implementation.
++ // The current implementation caches field offset in $StaticAccessor/$Accessor
++ int flags = java_lang_invoke_MemberName::flags(mem_name);
++ int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
++ if (MethodHandles::ref_kind_is_field(ref_kind)) {
++ // Note: we don't care about staticBase field (which is java.lang.Class)
++ // It should be processed during normal object update.
++ // Update offset in StaticAccessor
++ int offset = java_lang_invoke_MemberName::vmindex(mem_name);
++ if (offset != 0) { // index of 0 means that field no longer exist
++ if (java_lang_invoke_DirectMethodHandle_StaticAccessor::is_instance(obj)) {
++ java_lang_invoke_DirectMethodHandle_StaticAccessor::set_static_offset(obj, offset);
++ } else if (java_lang_invoke_DirectMethodHandle_Accessor::is_instance(obj)) {
++ java_lang_invoke_DirectMethodHandle_Accessor::set_field_offset(obj, offset);
++ }
++ }
++ }
++ return true;
++}
++
+ template <class T> void VM_RedefineClasses::do_oop_work(T* p) {
+ T heap_oop = oopDesc::load_heap_oop(p);
+ if (!oopDesc::is_null(heap_oop)) {
+@@ -2148,6 +2262,18 @@
+ }
+ }
+ }
++ } else {
++ // JSR 292 support, uptade java.lang.invoke.MemberName instances
++ if (java_lang_invoke_MemberName::is_instance(obj)) {
++ update_member_name(obj);
++ } else if (java_lang_invoke_DirectMethodHandle::is_instance(obj)) {
++ if (!update_direct_method_handle(obj)) {
++ // DMH is no longer valid, replace it with null reference.
++ // See note above. We probably want to replace this with something more meaningful.
++ oopDesc::encode_store_heap_oop_not_null(p, NULL);
++ //S::oop_store(p, NULL);
++ }
++ }
+ }
+ }
+ }
+@@ -2822,6 +2948,11 @@
+ // TODO:
+ transfer_old_native_function_registrations(the_old_class);
+
++ // Swap method handles
++ MemberNameTable* mnt = the_old_class->member_names();
++ assert(the_new_class->member_names() == NULL, "");
++ the_new_class->set_member_names(mnt);
++ the_old_class->set_member_names(NULL);
+
+ #ifdef ASSERT
+
+diff -r 2ffb90b422e2 src/share/vm/runtime/mutexLocker.cpp
+--- a/src/share/vm/runtime/mutexLocker.cpp Fri Jul 10 10:19:24 2015 -0700
++++ b/src/share/vm/runtime/mutexLocker.cpp Fri Jul 10 10:19:37 2015 -0700
+@@ -267,7 +267,7 @@
+ def(Heap_lock , Monitor, nonleaf+1, false);
+ def(JfieldIdCreation_lock , Mutex , nonleaf+1, true ); // jfieldID, Used in VM_Operation
+ def(JNICachedItableIndex_lock , Mutex , nonleaf+1, false); // Used to cache an itable index during JNI invoke
+- def(MemberNameTable_lock , Mutex , nonleaf+1, false); // Used to protect MemberNameTable
++ def(MemberNameTable_lock , Mutex , nonleaf+1, true); // Used to protect MemberNameTable
+
+ def(CompiledIC_lock , Mutex , nonleaf+2, false); // locks VtableStubs_lock, InlineCacheBuffer_lock
+ def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true );
--- /dev/null
+# HG changeset patch
+# Parent 882f6c762ac5352a0d94efcea46c8f9a917ceb08
+
+diff -r 882f6c762ac5 make/bsd/makefiles/gcc.make
+--- a/make/bsd/makefiles/gcc.make Thu Jul 09 23:10:04 2015 -0700
++++ b/make/bsd/makefiles/gcc.make Thu Jul 09 23:18:17 2015 -0700
+@@ -117,7 +117,10 @@
+ CFLAGS += -fno-rtti
+ CFLAGS += -fno-exceptions
+ CFLAGS += -pthread
+-CFLAGS += -fcheck-new
++## well, strictly speaking we should check for clang not Darwin
++ifneq ($(OS_VENDOR), Darwin)
++ CFLAGS += -fcheck-new
++endif
+ # version 4 and above support fvisibility=hidden (matches jni_x86.h file)
+ # except 4.1.2 gives pointless warnings that can't be disabled (afaik)
+ ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
+diff -r 882f6c762ac5 src/cpu/x86/vm/templateTable_x86_32.cpp
+--- a/src/cpu/x86/vm/templateTable_x86_32.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/cpu/x86/vm/templateTable_x86_32.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -2109,6 +2109,22 @@
+ // resolve first time through
+ address entry;
+ switch (bytecode()) {
++ case Bytecodes::_fast_agetfield : // fall through
++ case Bytecodes::_fast_bgetfield : // fall through
++ case Bytecodes::_fast_cgetfield : // fall through
++ case Bytecodes::_fast_dgetfield : // fall through
++ case Bytecodes::_fast_fgetfield : // fall through
++ case Bytecodes::_fast_igetfield : // fall through
++ case Bytecodes::_fast_lgetfield : // fall through
++ case Bytecodes::_fast_sgetfield : // fall through
++ case Bytecodes::_fast_aputfield : // fall through
++ case Bytecodes::_fast_bputfield : // fall through
++ case Bytecodes::_fast_cputfield : // fall through
++ case Bytecodes::_fast_dputfield : // fall through
++ case Bytecodes::_fast_fputfield : // fall through
++ case Bytecodes::_fast_iputfield : // fall through
++ case Bytecodes::_fast_lputfield : // fall through
++ case Bytecodes::_fast_sputfield : // fall through
+ case Bytecodes::_getstatic : // fall through
+ case Bytecodes::_putstatic : // fall through
+ case Bytecodes::_getfield : // fall through
+@@ -2211,6 +2227,7 @@
+ // Correct values of the cache and index registers are preserved.
+ void TemplateTable::jvmti_post_field_access(Register cache,
+ Register index,
++ int byte_no,
+ bool is_static,
+ bool has_tos) {
+ if (JvmtiExport::can_post_field_access()) {
+@@ -2237,7 +2254,11 @@
+ // cache: cache entry pointer
+ __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_field_access),
+ rax, cache);
+- __ get_cache_and_index_at_bcp(cache, index, 1);
++
++ // DCEVM: Redefinition might have occured => reresolve the cp entry.
++ __ restore_bcp();
++ resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
++
+ __ bind(L1);
+ }
+ }
+@@ -2258,7 +2279,7 @@
+ const Register flags = rax;
+
+ resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
+- jvmti_post_field_access(cache, index, is_static, false);
++ jvmti_post_field_access(cache, index, byte_no, is_static, false);
+ load_field_cp_cache_entry(obj, cache, index, off, flags, is_static);
+
+ if (!is_static) pop_and_check_object(obj);
+@@ -2393,7 +2414,7 @@
+
+ // The registers cache and index expected to be set before call.
+ // The function may destroy various registers, just not the cache and index registers.
+-void TemplateTable::jvmti_post_field_mod(Register cache, Register index, bool is_static) {
++void TemplateTable::jvmti_post_field_mod(Register cache, Register index, int byte_no, bool is_static) {
+
+ ByteSize cp_base_offset = constantPoolCacheOopDesc::base_offset();
+
+@@ -2451,7 +2472,11 @@
+ // rcx: jvalue object on the stack
+ __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_field_modification),
+ rbx, rax, rcx);
+- __ get_cache_and_index_at_bcp(cache, index, 1);
++
++ // (tw) Redefinition might have occured => reresolve the cp entry.
++ __ restore_bcp();
++ resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
++
+ __ bind(L1);
+ }
+ }
+@@ -2467,7 +2492,7 @@
+ const Register flags = rax;
+
+ resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
+- jvmti_post_field_mod(cache, index, is_static);
++ jvmti_post_field_mod(cache, index, byte_no, is_static);
+ load_field_cp_cache_entry(obj, cache, index, off, flags, is_static);
+
+ // Doug Lea believes this is not needed with current Sparcs (TSO) and Intel (PSO).
+@@ -2818,6 +2843,11 @@
+ // rcx: cache entry pointer
+ __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_field_access), rax, rcx);
+ __ pop_ptr(rax); // restore object pointer
++
++ // DCEVM: Redefinition might have occured => reresolve the cp entry.
++ __ restore_bcp();
++ resolve_cache_and_index(1, noreg, rax, rcx, sizeof(u2));
++
+ __ bind(L1);
+ }
+
+@@ -3008,6 +3038,26 @@
+
+ __ bind(notFinal);
+
++ // DCEVM: Check if we are calling an old method (and have to go slow path)
++ Label notOld;
++ __ movl(rax, flags);
++ __ andl(rax, (1 << ConstantPoolCacheEntry::is_old_method_shift));
++ __ jcc(Assembler::zero, notOld);
++
++ // Need a null check here!
++ __ null_check(recv);
++
++ // Call out to VM to do look up based on correct vTable version (has to iterate back over the class history of the receiver class)
++ // DCEVM: TODO: Check if we can improve performance by inlining.
++ // DCEVM: TODO: Check if this additional branch affects normal execution time.
++ __ call_VM(method, CAST_FROM_FN_PTR(address, InterpreterRuntime::find_correct_method), recv, index);
++
++ // profile this call
++ __ profile_final_call(rax);
++ __ jump_from_interpreted(method, rdx);
++
++ __ bind(notOld);
++
+ // get receiver klass
+ __ null_check(recv, oopDesc::klass_offset_in_bytes());
+ __ load_klass(rax, recv);
+@@ -3093,6 +3143,31 @@
+ invokevirtual_helper(rbx, rcx, rdx);
+ __ bind(notMethod);
+
++ // DCEVM: Check if we are calling an old method (and have to go slow path)
++ //__ movl(rax, rdx);
++ Label notOld;
++ __ andl(rdx, (1 << ConstantPoolCacheEntry::is_old_method_shift));
++ __ jcc(Assembler::zero, notOld);
++
++ // Get receiver klass into rdx - also a null check
++ __ movptr(rdx, Address(rcx, oopDesc::klass_offset_in_bytes()));
++ __ verify_oop(rdx);
++
++ // Call out to VM to do look up based on correct vTable version (has to iterate back over the class history of the receiver class)
++ // DCEVM: TODO: Check if we can improve performance by inlining.
++ // DCEVM: TODO: Check if this additional branch affects normal execution time.
++ // DCEVM: TODO: Check the exact semantic (with respect to destoying registers) of call_VM
++ __ call_VM(rbx, CAST_FROM_FN_PTR(address, InterpreterRuntime::find_correct_interface_method), rcx, rax, rbx);
++
++ // DCEVM: TODO: Check if resolved method could be null.
++
++ // profile this call
++ __ profile_virtual_call(rdx, rsi, rdi);
++
++ __ jump_from_interpreted(rbx, rdx);
++
++ __ bind(notOld);
++
+ // Get receiver klass into rdx - also a null check
+ __ restore_locals(); // restore rdi
+ __ null_check(rcx, oopDesc::klass_offset_in_bytes());
+diff -r 882f6c762ac5 src/cpu/x86/vm/templateTable_x86_64.cpp
+--- a/src/cpu/x86/vm/templateTable_x86_64.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/cpu/x86/vm/templateTable_x86_64.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -2151,6 +2151,22 @@
+ // resolve first time through
+ address entry;
+ switch (bytecode()) {
++ case Bytecodes::_fast_agetfield : // fall through
++ case Bytecodes::_fast_bgetfield : // fall through
++ case Bytecodes::_fast_cgetfield : // fall through
++ case Bytecodes::_fast_dgetfield : // fall through
++ case Bytecodes::_fast_fgetfield : // fall through
++ case Bytecodes::_fast_igetfield : // fall through
++ case Bytecodes::_fast_lgetfield : // fall through
++ case Bytecodes::_fast_sgetfield : // fall through
++ case Bytecodes::_fast_aputfield : // fall through
++ case Bytecodes::_fast_bputfield : // fall through
++ case Bytecodes::_fast_cputfield : // fall through
++ case Bytecodes::_fast_dputfield : // fall through
++ case Bytecodes::_fast_fputfield : // fall through
++ case Bytecodes::_fast_iputfield : // fall through
++ case Bytecodes::_fast_lputfield : // fall through
++ case Bytecodes::_fast_sputfield : // fall through
+ case Bytecodes::_getstatic:
+ case Bytecodes::_putstatic:
+ case Bytecodes::_getfield:
+@@ -2267,7 +2283,7 @@
+ // The registers cache and index expected to be set before call.
+ // Correct values of the cache and index registers are preserved.
+ void TemplateTable::jvmti_post_field_access(Register cache, Register index,
+- bool is_static, bool has_tos) {
++ int byte_no, bool is_static, bool has_tos) {
+ // do the JVMTI work here to avoid disturbing the register state below
+ // We use c_rarg registers here because we want to use the register used in
+ // the call to the VM
+@@ -2298,7 +2314,11 @@
+ __ call_VM(noreg, CAST_FROM_FN_PTR(address,
+ InterpreterRuntime::post_field_access),
+ c_rarg1, c_rarg2, c_rarg3);
+- __ get_cache_and_index_at_bcp(cache, index, 1);
++
++ // DCEVM: Redefinition might have occured => reresolve the cp entry.
++ __ restore_bcp();
++ resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
++
+ __ bind(L1);
+ }
+ }
+@@ -2320,7 +2340,7 @@
+ const Register bc = c_rarg3; // uses same reg as obj, so don't mix them
+
+ resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
+- jvmti_post_field_access(cache, index, is_static, false);
++ jvmti_post_field_access(cache, index, byte_no, is_static, false);
+ load_field_cp_cache_entry(obj, cache, index, off, flags, is_static);
+
+ if (!is_static) {
+@@ -2455,7 +2475,7 @@
+
+ // The registers cache and index expected to be set before call.
+ // The function may destroy various registers, just not the cache and index registers.
+-void TemplateTable::jvmti_post_field_mod(Register cache, Register index, bool is_static) {
++void TemplateTable::jvmti_post_field_mod(Register cache, Register index, int byte_no, bool is_static) {
+ transition(vtos, vtos);
+
+ ByteSize cp_base_offset = constantPoolCacheOopDesc::base_offset();
+@@ -2507,7 +2527,11 @@
+ CAST_FROM_FN_PTR(address,
+ InterpreterRuntime::post_field_modification),
+ c_rarg1, c_rarg2, c_rarg3);
+- __ get_cache_and_index_at_bcp(cache, index, 1);
++
++ // DCEVM: Redefinition might have occured => reresolve the cp entry.
++ __ restore_bcp();
++ resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
++
+ __ bind(L1);
+ }
+ }
+@@ -2523,7 +2547,7 @@
+ const Register bc = c_rarg3;
+
+ resolve_cache_and_index(byte_no, noreg, cache, index, sizeof(u2));
+- jvmti_post_field_mod(cache, index, is_static);
++ jvmti_post_field_mod(cache, index, byte_no, is_static);
+ load_field_cp_cache_entry(obj, cache, index, off, flags, is_static);
+
+ // [jk] not needed currently
+@@ -2837,6 +2861,11 @@
+ InterpreterRuntime::post_field_access),
+ c_rarg1, c_rarg2);
+ __ pop_ptr(rax); // restore object pointer
++
++ // DCEVM: Redefinition might have occured => reresolve the cp entry.
++ __ restore_bcp();
++ resolve_cache_and_index(1, noreg, rax, rcx, sizeof(u2));
++
+ __ bind(L1);
+ }
+
+@@ -3073,6 +3102,26 @@
+
+ __ bind(notFinal);
+
++ // DCEVM: Check if we are calling an old method (and have to go slow path)
++ Label notOld;
++ __ movl(rax, flags);
++ __ andl(rax, (1 << ConstantPoolCacheEntry::is_old_method_shift));
++ __ jcc(Assembler::zero, notOld);
++
++ // Need a null check here!
++ __ null_check(recv);
++
++ // Call out to VM to do look up based on correct vTable version (has to iterate back over the class history of the receiver class)
++ // DCEVM: TODO: Check if we can improve performance by inlining.
++ // DCEVM: TODO: Check if this additional branch affects normal execution time.
++ __ call_VM(method, CAST_FROM_FN_PTR(address, InterpreterRuntime::find_correct_method), recv, index);
++
++ // profile this call
++ __ profile_final_call(rax);
++ __ jump_from_interpreted(method, rdx);
++
++ __ bind(notOld);
++
+ // get receiver klass
+ __ null_check(recv, oopDesc::klass_offset_in_bytes());
+ __ load_klass(rax, recv);
+@@ -3156,6 +3205,35 @@
+ invokevirtual_helper(rbx, rcx, rdx);
+ __ bind(notMethod);
+
++ // DCEVM: Check if we are calling an old method (and have to go slow path)
++ Label notOld;
++ __ andl(rdx, (1 << ConstantPoolCacheEntry::is_old_method_shift));
++ __ jcc(Assembler::zero, notOld);
++
++ // Call out to VM to do look up based on correct vTable version (has to iterate back over the class history of the receiver class)
++ // DCEVM: TODO: Check if we can improve performance by inlining.
++ // DCEVM: TODO: Check if this additional branch affects normal execution time.
++ // DCEVM: TODO: Check the exact semantic (with respect to destoying registers) of call_VM
++ // DCEVM: FIXME: What exactly should we store here?
++ __ push(rcx); // destroyed by Linux arguments passing conventions
++ __ movptr(r14, rcx);
++ __ call_VM(rbx, CAST_FROM_FN_PTR(address, InterpreterRuntime::find_correct_interface_method), r14, rax, rbx);
++ __ pop(rcx);
++
++ // Get receiver klass into rdx - also a null check
++ __ restore_locals(); // restore r14
++ __ load_klass(rdx, rcx);
++ __ verify_oop(rdx);
++
++ // DCEVM: TODO: Check if resolved method could be null.
++
++ // profile this call
++ __ profile_virtual_call(rdx, r13, r14);
++
++ __ jump_from_interpreted(rbx, rdx);
++
++ __ bind(notOld);
++
+ // Get receiver klass into rdx - also a null check
+ __ restore_locals(); // restore r14
+ __ null_check(rcx, oopDesc::klass_offset_in_bytes());
+diff -r 882f6c762ac5 src/share/vm/c1/c1_Compilation.hpp
+--- a/src/share/vm/c1/c1_Compilation.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/c1/c1_Compilation.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -242,8 +242,8 @@
+ #define BAILOUT(msg) { bailout(msg); return; }
+ #define BAILOUT_(msg, res) { bailout(msg); return res; }
+
+-#define CHECK_BAILOUT() { if (bailed_out()) return; }
+-#define CHECK_BAILOUT_(res) { if (bailed_out()) return res; }
++#define CHECK_BAILOUT() { if (((CompilerThread *)Thread::current())->should_bailout()) bailout("Aborted externally"); if (bailed_out()) return; }
++#define CHECK_BAILOUT_(res) { if (((CompilerThread *)Thread::current())->should_bailout()) bailout("Aborted externally"); if (bailed_out()) return res; }
+
+
+ class InstructionMark: public StackObj {
+diff -r 882f6c762ac5 src/share/vm/ci/ciEnv.cpp
+--- a/src/share/vm/ci/ciEnv.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/ci/ciEnv.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -1172,3 +1172,11 @@
+ // If memory is low, we stop compiling methods.
+ record_method_not_compilable("out of memory");
+ }
++
++// DCEVM: Called after class redefinition to clean up possibly invalidated state.
++void ciEnv::cleanup_after_redefinition() {
++
++ if (_factory != NULL) {
++ _factory->cleanup_after_redefinition();
++ }
++}
+diff -r 882f6c762ac5 src/share/vm/ci/ciEnv.hpp
+--- a/src/share/vm/ci/ciEnv.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/ci/ciEnv.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -417,6 +417,8 @@
+ void record_failure(const char* reason);
+ void record_method_not_compilable(const char* reason, bool all_tiers = true);
+ void record_out_of_memory_failure();
++
++ void cleanup_after_redefinition();
+ };
+
+ #endif // SHARE_VM_CI_CIENV_HPP
+diff -r 882f6c762ac5 src/share/vm/ci/ciObjectFactory.cpp
+--- a/src/share/vm/ci/ciObjectFactory.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/ci/ciObjectFactory.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -296,6 +296,11 @@
+ // into the table. We need to recompute our index.
+ index = find(keyHandle(), _ci_objects);
+ }
++
++ if (is_found_at(index, keyHandle(), _ci_objects)) {
++ // DCEVM: Check if this is an error? Can occur when redefining classes.
++ return _ci_objects->at(index);
++ }
+ assert(!is_found_at(index, keyHandle(), _ci_objects), "no double insert");
+ insert(index, new_object, _ci_objects);
+ return new_object;
+@@ -764,3 +769,50 @@
+ _unloaded_instances->length(),
+ _unloaded_klasses->length());
+ }
++
++// DCEVM: Resoring the ciObject arrays after class redefinition
++void ciObjectFactory::sort_ci_objects(GrowableArray<ciObject*>* objects) {
++
++ // Resort the _ci_objects array. The order of two class pointers can be changed during class redefinition.
++ oop last = NULL;
++ for (int j = 0; j< objects->length(); j++) {
++ oop o = objects->at(j)->get_oop();
++ if (last >= o) {
++ int cur_last_index = j - 1;
++ oop cur_last = last;
++ while (cur_last >= o) {
++
++ // Swap the two objects to guarantee ordering
++ ciObject *tmp = objects->at(cur_last_index);
++ objects->at_put(cur_last_index, objects->at(cur_last_index + 1));
++ objects->at_put(cur_last_index + 1, tmp);
++
++ // Decrement index to move one step to the left
++ cur_last_index--;
++ if (cur_last_index < 0) {
++ break;
++ }
++ cur_last = objects->at(cur_last_index)->get_oop();
++ }
++ } else {
++ assert(last < o, "out of order");
++ last = o;
++ }
++ }
++
++#ifdef ASSERT
++ if (CIObjectFactoryVerify) {
++ oop last = NULL;
++ for (int j = 0; j< objects->length(); j++) {
++ oop o = objects->at(j)->get_oop();
++ assert(last < o, "out of order");
++ last = o;
++ }
++ }
++#endif // ASSERT
++}
++
++// DCEVM: Called after class redefinition to clean up possibly invalidated state.
++void ciObjectFactory::cleanup_after_redefinition() {
++ sort_ci_objects(_ci_objects);
++}
+diff -r 882f6c762ac5 src/share/vm/ci/ciObjectFactory.hpp
+--- a/src/share/vm/ci/ciObjectFactory.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/ci/ciObjectFactory.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -38,6 +38,7 @@
+ class ciObjectFactory : public ResourceObj {
+ friend class VMStructs;
+ friend class ciEnv;
++ friend class CompileBroker;
+
+ private:
+ static volatile bool _initialized;
+@@ -137,6 +138,11 @@
+
+ void print_contents();
+ void print();
++
++private:
++
++ static void sort_ci_objects(GrowableArray<ciObject*>* objects);
++ void cleanup_after_redefinition();
+ };
+
+ #endif // SHARE_VM_CI_CIOBJECTFACTORY_HPP
+diff -r 882f6c762ac5 src/share/vm/classfile/classFileParser.cpp
+--- a/src/share/vm/classfile/classFileParser.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/classfile/classFileParser.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -795,6 +795,7 @@
+ Handle class_loader,
+ Handle protection_domain,
+ Symbol* class_name,
++ KlassHandle old_klass,
+ TRAPS) {
+ ClassFileStream* cfs = stream();
+ assert(length > 0, "only called for length>0");
+@@ -813,6 +814,9 @@
+ interface_index, CHECK_(nullHandle));
+ if (cp->tag_at(interface_index).is_klass()) {
+ interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
++ if (!old_klass.is_null() && !interf->is_newest_version()) {
++ interf = KlassHandle(THREAD, interf->newest_version());
++ }
+ } else {
+ Symbol* unresolved_klass = cp->klass_name_at(interface_index);
+
+@@ -825,6 +829,9 @@
+ klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
+ unresolved_klass, class_loader, protection_domain,
+ false, CHECK_(nullHandle));
++ if (!old_klass.is_null()) {
++ k = k->klass_part()->newest_version();
++ }
+ interf = KlassHandle(THREAD, k);
+ }
+
+@@ -1923,6 +1930,8 @@
+ int runtime_invisible_parameter_annotations_length = 0;
+ u1* annotation_default = NULL;
+ int annotation_default_length = 0;
++ u2 code_section_table_length;
++ typeArrayHandle code_section_table;
+
+ // Parse code and exceptions attribute
+ u2 method_attributes_count = cfs->get_u2_fast();
+@@ -2092,6 +2101,24 @@
+ parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
+ stackmap_data = typeArrayHandle(THREAD, sm);
+ parsed_stackmap_attribute = true;
++ } else if (UseMethodForwardPoints && cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_code_sections()) {
++ int length = code_attribute_length;
++ int value_count = length / sizeof(u2);
++ int line_count = length / 3;
++ if (TraceRedefineClasses >= 3) {
++ tty->print_cr("Found code section attribute when loading class with %d entries", value_count, line_count);
++ }
++ code_section_table_length = value_count;
++ code_section_table = oopFactory::new_permanent_shortArray(value_count, CHECK_NULL);
++ code_section_table->set_length(value_count);
++
++ for (int i = 0; i < value_count; ++i) {
++ u2 value = cfs->get_u2(CHECK_(nullHandle));
++ code_section_table->short_at_put(i, value);
++ if (TraceRedefineClasses >= 4) {
++ tty->print_cr("Code section table at %d: %d", i, value);
++ }
++ }
+ } else {
+ // Skip unknown attributes
+ cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
+@@ -2216,6 +2243,18 @@
+ }
+ #endif
+
++ // DCEVM: TODO: Get a different solution for the problem of method forward
++ // points and variable sized interpreter frames.
++ if (UseMethodForwardPoints) {
++ if (max_stack > MethodForwardPointsMaxStack) {
++ fatal(err_msg("Method has too large stack (%d), increase the value of MethodForwardPointsMaxStack (%d)", max_stack, MethodForwardPointsMaxStack));
++ }
++ if (max_locals > MethodForwardPointsMaxLocals) {
++ fatal(err_msg("Method has too many locals (%d), increase the value of MethodForwardPointsMaxLocals (%d)", max_stack, MethodForwardPointsMaxStack));
++ }
++ max_stack = MethodForwardPointsMaxStack;
++ max_locals = MethodForwardPointsMaxLocals;
++ }
+ // Fill in code attribute information
+ m->set_max_stack(max_stack);
+ m->set_max_locals(max_locals);
+@@ -2229,6 +2268,8 @@
+ */
+ m->constMethod()->set_stackmap_data(stackmap_data());
+
++ m->constMethod()->set_code_section_table(code_section_table());
++
+ // Copy byte codes
+ m->set_code(code_start);
+
+@@ -2825,6 +2866,15 @@
+ "Invalid Deprecated classfile attribute length %u in class file %s",
+ attribute_length, CHECK);
+ }
++ } else if (tag == vmSymbols::tag_field_redefinition_policy()) {
++ // DCEVM: Check for deleted field attribute
++ _field_redefinition_policy = cfs->get_u1_fast();
++ } else if (tag == vmSymbols::tag_static_field_redefinition_policy()) {
++ // DCEVM: Check for deleted static field attribute
++ _static_field_redefinition_policy = cfs->get_u1_fast();
++ } else if (tag == vmSymbols::tag_method_redefinition_policy()) {
++ // DCEVM: Check for deleted method attribute
++ _method_redefinition_policy = cfs->get_u1_fast();
+ } else if (_major_version >= JAVA_1_5_VERSION) {
+ if (tag == vmSymbols::tag_signature()) {
+ if (attribute_length != 2) {
+@@ -2929,6 +2979,17 @@
+ }
+ k->set_inner_classes(_inner_classes());
+ k->set_class_annotations(_annotations());
++
++
++ if (_field_redefinition_policy != 0xff) {
++ k->set_field_redefinition_policy(_field_redefinition_policy);
++ }
++ if (_static_field_redefinition_policy != 0xff) {
++ k->set_static_field_redefinition_policy(_static_field_redefinition_policy);
++ }
++ if (_method_redefinition_policy != 0xff) {
++ k->set_method_redefinition_policy(_method_redefinition_policy);
++ }
+ }
+
+ typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
+@@ -2952,9 +3013,126 @@
+ }
+
+
++// DCEVM: Finds the super symbols by reading the bytes of the class and returns
++// them in a growable array.
++void ClassFileParser::findSuperSymbols(Symbol* name,
++ Handle class_loader,
++ Handle protection_domain,
++ KlassHandle old_klass,
++ GrowableArray<Symbol*> &handles,
++ TRAPS) {
++
++ _cp_patches = NULL;
++ // So that JVMTI can cache class file in the state before retransformable agents
++ // have modified it
++ unsigned char *cached_class_file_bytes = NULL;
++
++ ClassFileStream* cfs = stream();
++
++ _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
++
++ instanceKlassHandle nullHandle;
++
++ // Save the class file name for easier error message printing.
++ _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
++
++ cfs->guarantee_more(8, CHECK); // magic, major, minor
++ // Magic value
++ u4 magic = cfs->get_u4_fast();
++ if (magic != JAVA_CLASSFILE_MAGIC) {
++ // Invalid class file!
++ return;
++ }
++
++ // Version numbers
++ u2 minor_version = cfs->get_u2_fast();
++ u2 major_version = cfs->get_u2_fast();
++
++ // Check version numbers - we check this even with verifier off
++ if (!is_supported_version(major_version, minor_version)) {
++
++ // Unsupported version!
++ return;
++ }
++
++ _major_version = major_version;
++ _minor_version = minor_version;
++
++
++ // Check if verification needs to be relaxed for this class file
++ // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
++ _relax_verify = Verifier::relax_verify_for(class_loader());
++ _need_verify = false;
++
++ // Constant pool
++ constantPoolHandle cp = parse_constant_pool(class_loader(), CHECK);
++ int cp_size = cp->length();
++
++ cfs->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
++
++ // Access flags
++ AccessFlags access_flags;
++ jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
++
++ if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
++ // Set abstract bit for old class files for backward compatibility
++ flags |= JVM_ACC_ABSTRACT;
++ }
++ access_flags.set_flags(flags);
++
++ // This class and superclass
++ instanceKlassHandle super_klass;
++ u2 this_class_index = cfs->get_u2_fast();
++ check_property(
++ valid_cp_range(this_class_index, cp_size) &&
++ cp->tag_at(this_class_index).is_unresolved_klass(),
++ "Invalid this class index %u in constant pool in class file %s",
++ this_class_index, CHECK);
++
++ Symbol* class_name = cp->unresolved_klass_at(this_class_index);
++ assert(class_name != NULL, "class_name can't be null");
++
++ // Update _class_name which could be null previously to be class_name
++ _class_name = class_name;
++
++ // DCEVM: DO NOT release all handles when parsing is done
++ {// HandleMark hm(THREAD);
++
++ // Checks if name in class file matches requested name
++ if (name != NULL && class_name != name) {
++ return;
++ }
++
++ u2 super_class_index = cfs->get_u2_fast();
++
++ if (super_class_index != 0) {
++ Symbol* super_class = cp->klass_name_at(super_class_index);
++ handles.append(super_class);
++ } else {
++ // DCEVM: This redefinition must be for the Object class.
++ }
++
++ // Interfaces
++ u2 itfs_len = cfs->get_u2_fast();
++ objArrayHandle local_interfaces;
++ if (itfs_len == 0) {
++ local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
++ } else {
++ local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, old_klass, CHECK);
++ }
++
++ for (int i=0; i<local_interfaces->length(); i++) {
++ oop o = local_interfaces->obj_at(i);
++ Symbol* interface_handle = ((klassOop)o)->klass_part()->name();
++ handles.append(interface_handle);
++ }
++ }
++}
++
+ instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
+ Handle class_loader,
+ Handle protection_domain,
++ KlassHandle old_klass,
+ KlassHandle host_klass,
+ GrowableArray<Handle>* cp_patches,
+ TempNewSymbol& parsed_name,
+@@ -3005,10 +3183,13 @@
+ unsigned char* ptr = cfs->buffer();
+ unsigned char* end_ptr = cfs->buffer() + cfs->length();
+
++ bool pretend_new_universe = Thread::current()->pretend_new_universe();
++ Thread::current()->set_pretend_new_universe(false);
+ JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
+ &ptr, &end_ptr,
+ &cached_class_file_bytes,
+ &cached_class_file_length);
++ Thread::current()->set_pretend_new_universe(pretend_new_universe);
+
+ if (ptr != cfs->buffer()) {
+ // JVMTI agent has modified class file data.
+@@ -3164,7 +3345,11 @@
+ // However, make sure it is not an array type.
+ bool is_array = false;
+ if (cp->tag_at(super_class_index).is_klass()) {
+- super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
++ klassOop resolved_klass = cp->resolved_klass_at(super_class_index);
++ if (!old_klass.is_null()) {
++ resolved_klass = resolved_klass->klass_part()->newest_version();
++ }
++ super_klass = instanceKlassHandle(THREAD, resolved_klass);
+ if (_need_verify)
+ is_array = super_klass->oop_is_array();
+ } else if (_need_verify) {
+@@ -3182,7 +3367,7 @@
+ if (itfs_len == 0) {
+ local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
+ } else {
+- local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
++ local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, old_klass, CHECK_(nullHandle));
+ }
+
+ u2 java_fields_count = 0;
+@@ -3237,7 +3422,9 @@
+ protection_domain,
+ true,
+ CHECK_(nullHandle));
+-
++ if (!old_klass.is_null()) {
++ k = k->klass_part()->newest_version();
++ }
+ KlassHandle kh (THREAD, k);
+ super_klass = instanceKlassHandle(THREAD, kh());
+ }
+@@ -3626,6 +3813,19 @@
+ rt = REF_NONE;
+ } else {
+ rt = super_klass->reference_type();
++
++ // DCEVM: With class redefinition, it can also happen that special classes are loaded.
++ if (name == vmSymbols::java_lang_ref_Reference()) {
++ rt = REF_OTHER;
++ } else if (name == vmSymbols::java_lang_ref_SoftReference()) {
++ rt = REF_SOFT;
++ } else if (name == vmSymbols::java_lang_ref_WeakReference()) {
++ rt = REF_WEAK;
++ } else if (name == vmSymbols::java_lang_ref_FinalReference()) {
++ rt = REF_FINAL;
++ } else if (name == vmSymbols::java_lang_ref_PhantomReference()) {
++ rt = REF_PHANTOM;
++ }
+ }
+
+ // We can now create the basic klassOop for this klass
+@@ -3726,7 +3926,7 @@
+ fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
+
+ // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
+- set_precomputed_flags(this_klass);
++ set_precomputed_flags(this_klass, old_klass);
+
+ // reinitialize modifiers, using the InnerClasses attribute
+ int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
+@@ -3749,6 +3949,10 @@
+ // Allocate mirror and initialize static fields
+ java_lang_Class::create_mirror(this_klass, CHECK_(nullHandle));
+
++ if (rt == REF_OTHER) {
++ instanceRefKlass::update_nonstatic_oop_maps(ik);
++ }
++
+ ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
+ false /* not shared class */);
+
+@@ -3891,7 +4095,7 @@
+ }
+
+
+-void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
++void ClassFileParser::set_precomputed_flags(instanceKlassHandle k, KlassHandle old_klass) {
+ klassOop super = k->super();
+
+ // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
+@@ -3899,7 +4103,9 @@
+ if (!_has_empty_finalizer) {
+ if (_has_finalizer ||
+ (super != NULL && super->klass_part()->has_finalizer())) {
+- k->set_has_finalizer();
++ if (old_klass.is_null() || old_klass->has_finalizer()) {
++ k->set_has_finalizer();
++ }
+ }
+ }
+
+@@ -3915,7 +4121,7 @@
+
+ // Check if this klass supports the java.lang.Cloneable interface
+ if (SystemDictionary::Cloneable_klass_loaded()) {
+- if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
++ if (k->is_subtype_of(SystemDictionary::Cloneable_klass()) || k->is_subtype_of(SystemDictionary::Cloneable_klass()->klass_part()->newest_version())) {
+ k->set_is_cloneable();
+ }
+ }
+diff -r 882f6c762ac5 src/share/vm/classfile/classFileParser.hpp
+--- a/src/share/vm/classfile/classFileParser.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/classfile/classFileParser.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -64,6 +64,9 @@
+ int _sde_length;
+ typeArrayHandle _inner_classes;
+ typeArrayHandle _annotations;
++ u1 _field_redefinition_policy;
++ u1 _static_field_redefinition_policy;
++ u1 _method_redefinition_policy;
+
+ void set_class_synthetic_flag(bool x) { _synthetic_flag = x; }
+ void set_class_sourcefile(Symbol* x) { _sourcefile = x; }
+@@ -151,6 +154,7 @@
+ Handle class_loader,
+ Handle protection_domain,
+ Symbol* class_name,
++ KlassHandle old_klass,
+ TRAPS);
+
+ // Field parsing
+@@ -239,7 +243,7 @@
+ unsigned int nonstatic_oop_map_count,
+ int* nonstatic_oop_offsets,
+ unsigned int* nonstatic_oop_counts);
+- void set_precomputed_flags(instanceKlassHandle k);
++ void set_precomputed_flags(instanceKlassHandle k, KlassHandle old_klass);
+ objArrayHandle compute_transitive_interfaces(instanceKlassHandle super,
+ objArrayHandle local_ifs, TRAPS);
+
+@@ -345,7 +349,12 @@
+
+ public:
+ // Constructor
+- ClassFileParser(ClassFileStream* st) { set_stream(st); }
++ ClassFileParser(ClassFileStream* st) {
++ set_stream(st);
++ _field_redefinition_policy = 0xff;
++ _static_field_redefinition_policy = 0xff;
++ _method_redefinition_policy = 0xff;
++ }
+
+ // Parse .class file and return new klassOop. The klassOop is not hooked up
+ // to the system dictionary or any other structures, so a .class file can
+@@ -357,21 +366,33 @@
+ instanceKlassHandle parseClassFile(Symbol* name,
+ Handle class_loader,
+ Handle protection_domain,
++ KlassHandle old_klass,
+ TempNewSymbol& parsed_name,
+ bool verify,
+ TRAPS) {
+ KlassHandle no_host_klass;
+- return parseClassFile(name, class_loader, protection_domain, no_host_klass, NULL, parsed_name, verify, THREAD);
++ return parseClassFile(name, class_loader, protection_domain, old_klass, no_host_klass, NULL, parsed_name, verify, THREAD);
+ }
+ instanceKlassHandle parseClassFile(Symbol* name,
+ Handle class_loader,
+ Handle protection_domain,
++ KlassHandle old_klass,
+ KlassHandle host_klass,
+ GrowableArray<Handle>* cp_patches,
+ TempNewSymbol& parsed_name,
+ bool verify,
+ TRAPS);
+
++ static void initialize_static_field(fieldDescriptor* fd, TRAPS);
++
++ // DCEVM: Creates symbol handles for the super class and the interfaces
++ void findSuperSymbols(Symbol* name,
++ Handle class_loader,
++ Handle protection_domain,
++ KlassHandle old_klass,
++ GrowableArray<Symbol*> &handles,
++ TRAPS);
++
+ // Verifier checks
+ static void check_super_class_access(instanceKlassHandle this_klass, TRAPS);
+ static void check_super_interface_access(instanceKlassHandle this_klass, TRAPS);
+diff -r 882f6c762ac5 src/share/vm/classfile/classLoader.cpp
+--- a/src/share/vm/classfile/classLoader.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/classfile/classLoader.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -915,6 +915,7 @@
+ instanceKlassHandle result = parser.parseClassFile(h_name,
+ class_loader,
+ protection_domain,
++ KlassHandle(),
+ parsed_name,
+ false,
+ CHECK_(h));
+diff -r 882f6c762ac5 src/share/vm/classfile/dictionary.cpp
+--- a/src/share/vm/classfile/dictionary.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/classfile/dictionary.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -326,6 +326,21 @@
+ }
+ }
+
++
++// DCEVM: Just the classes from defining class loaders
++void Dictionary::classes_do(ObjectClosure *closure) {
++ for (int index = 0; index < table_size(); index++) {
++ for (DictionaryEntry* probe = bucket(index);
++ probe != NULL;
++ probe = probe->next()) {
++ klassOop k = probe->klass();
++ if (probe->loader() == instanceKlass::cast(k)->class_loader()) {
++ closure->do_object(k);
++ }
++ }
++ }
++}
++
+ // Added for initialize_itable_for_klass to handle exceptions
+ // Just the classes from defining class loaders
+ void Dictionary::classes_do(void f(klassOop, TRAPS), TRAPS) {
+@@ -433,6 +448,33 @@
+ add_entry(index, entry);
+ }
+
++// DCEVM: Updates the klass entry to point to the new klassOop. Necessary only for class redefinition.
++bool Dictionary::update_klass(int index, unsigned int hash, Symbol* name, Handle loader, KlassHandle k, KlassHandle old_class) {
++
++ // There are several entries for the same class in the dictionary: One extra entry for each parent classloader of the classloader of the class.
++ bool found = false;
++ for (int index = 0; index < table_size(); index++) {
++ for (DictionaryEntry* entry = bucket(index); entry != NULL; entry = entry->next()) {
++ if (entry->klass() == old_class()) {
++ entry->set_literal(k());
++ found = true;
++ }
++ }
++ }
++
++ return found;
++}
++
++// DCEVM: Undo previous updates to the system dictionary
++void Dictionary::rollback_redefinition() {
++ for (int index = 0; index < table_size(); index++) {
++ for (DictionaryEntry* entry = bucket(index); entry != NULL; entry = entry->next()) {
++ if (entry->klass()->klass_part()->is_redefining()) {
++ entry->set_literal(entry->klass()->klass_part()->old_version());
++ }
++ }
++ }
++}
+
+ // This routine does not lock the system dictionary.
+ //
+@@ -459,12 +501,22 @@
+ return NULL;
+ }
+
++// DCEVM: return old version if we are not in the new universe?
++klassOop Dictionary::intercept_for_version(klassOop k) {
++ if (k == NULL) return k;
++
++ if (k->klass_part()->is_redefining() && !Thread::current()->pretend_new_universe()) {
++ return k->klass_part()->old_version();
++ }
++
++ return k;
++}
+
+ klassOop Dictionary::find(int index, unsigned int hash, Symbol* name,
+ Handle loader, Handle protection_domain, TRAPS) {
+ DictionaryEntry* entry = get_entry(index, hash, name, loader);
+ if (entry != NULL && entry->is_valid_protection_domain(protection_domain)) {
+- return entry->klass();
++ return intercept_for_version(entry->klass());
+ } else {
+ return NULL;
+ }
+@@ -477,7 +529,7 @@
+ assert (index == index_for(name, loader), "incorrect index?");
+
+ DictionaryEntry* entry = get_entry(index, hash, name, loader);
+- return (entry != NULL) ? entry->klass() : (klassOop)NULL;
++ return intercept_for_version((entry != NULL) ? entry->klass() : (klassOop)NULL);
+ }
+
+
+@@ -489,7 +541,7 @@
+ assert (index == index_for(name, Handle()), "incorrect index?");
+
+ DictionaryEntry* entry = get_entry(index, hash, name, Handle());
+- return (entry != NULL) ? entry->klass() : (klassOop)NULL;
++ return intercept_for_version((entry != NULL) ? entry->klass() : (klassOop)NULL);
+ }
+
+
+diff -r 882f6c762ac5 src/share/vm/classfile/dictionary.hpp
+--- a/src/share/vm/classfile/dictionary.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/classfile/dictionary.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -73,6 +73,10 @@
+
+ void add_klass(Symbol* class_name, Handle class_loader,KlassHandle obj);
+
++ bool update_klass(int index, unsigned int hash, Symbol* name, Handle loader, KlassHandle k, KlassHandle old_class);
++
++ void rollback_redefinition();
++
+ klassOop find_class(int index, unsigned int hash,
+ Symbol* name, Handle loader);
+
+@@ -89,6 +93,7 @@
+ void classes_do(void f(klassOop, TRAPS), TRAPS);
+ void classes_do(void f(klassOop, oop));
+ void classes_do(void f(klassOop, oop, TRAPS), TRAPS);
++ void classes_do(ObjectClosure *closure);
+
+ void methods_do(void f(methodOop));
+
+@@ -105,6 +110,7 @@
+ bool do_unloading(BoolObjectClosure* is_alive);
+
+ // Protection domains
++ static klassOop intercept_for_version(klassOop k);
+ klassOop find(int index, unsigned int hash, Symbol* name,
+ Handle loader, Handle protection_domain, TRAPS);
+ bool is_valid_protection_domain(int index, unsigned int hash,
+diff -r 882f6c762ac5 src/share/vm/classfile/javaClasses.cpp
+--- a/src/share/vm/classfile/javaClasses.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/classfile/javaClasses.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -1798,7 +1798,7 @@
+ klassOop klass = SystemDictionary::reflect_Method_klass();
+ // This class is eagerly initialized during VM initialization, since we keep a refence
+ // to one of the methods
+- assert(instanceKlass::cast(klass)->is_initialized(), "must be initialized");
++ assert(instanceKlass::cast(klass)->is_initialized() || klass->klass_part()->old_version() != NULL, "must be initialized");
+ return instanceKlass::cast(klass)->allocate_instance_handle(CHECK_NH);
+ }
+
+diff -r 882f6c762ac5 src/share/vm/classfile/javaClasses.hpp
+--- a/src/share/vm/classfile/javaClasses.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/classfile/javaClasses.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -213,7 +213,6 @@
+
+ class java_lang_Class : AllStatic {
+ friend class VMStructs;
+-
+ private:
+ // The fake offsets are added by the class loader when java.lang.Class is loaded
+
+diff -r 882f6c762ac5 src/share/vm/classfile/loaderConstraints.cpp
+--- a/src/share/vm/classfile/loaderConstraints.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/classfile/loaderConstraints.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -449,7 +449,7 @@
+ if (k != NULL) {
+ // We found the class in the system dictionary, so we should
+ // make sure that the klassOop matches what we already have.
+- guarantee(k == probe->klass(), "klass should be in dictionary");
++ guarantee(k == probe->klass()->klass_part()->newest_version(), "klass should be in dictionary");
+ } else {
+ // If we don't find the class in the system dictionary, it
+ // has to be in the placeholders table.
+diff -r 882f6c762ac5 src/share/vm/classfile/loaderConstraints.hpp
+--- a/src/share/vm/classfile/loaderConstraints.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/classfile/loaderConstraints.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -106,7 +106,7 @@
+
+ klassOop klass() { return literal(); }
+ klassOop* klass_addr() { return literal_addr(); }
+- void set_klass(klassOop k) { set_literal(k); }
++ void set_klass(klassOop k) { set_literal(k); assert(k == NULL || !k->klass_part()->is_redefining(), "just checking"); }
+
+ LoaderConstraintEntry* next() {
+ return (LoaderConstraintEntry*)HashtableEntry<klassOop, mtClass>::next();
+diff -r 882f6c762ac5 src/share/vm/classfile/systemDictionary.cpp
+--- a/src/share/vm/classfile/systemDictionary.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/classfile/systemDictionary.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -157,6 +157,7 @@
+ // can return a null klass
+ klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD);
+ }
++ assert(klass == NULL || klass->klass_part()->is_newest_version() || klass->klass_part()->newest_version()->klass_part()->is_redefining(), "must be");
+ return klass;
+ }
+
+@@ -199,7 +200,8 @@
+ // Forwards to resolve_instance_class_or_null
+
+ klassOop SystemDictionary::resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) {
+- assert(!THREAD->is_Compiler_thread(),
++ // DCEVM: Check if this relaxing of the condition is correct? Test case hs203t004 failing otherwise.
++ assert(!THREAD->is_Compiler_thread() || JvmtiThreadState::state_for(JavaThread::current())->get_class_being_redefined() != NULL,
+ err_msg("can not load classes with compiler thread: class=%s, classloader=%s",
+ class_name->as_C_string(),
+ class_loader.is_null() ? "null" : class_loader->klass()->klass_part()->name()->as_C_string()));
+@@ -961,6 +963,7 @@
+ instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name,
+ class_loader,
+ protection_domain,
++ KlassHandle(),
+ host_klass,
+ cp_patches,
+ parsed_name,
+@@ -1022,7 +1025,14 @@
+ Handle protection_domain,
+ ClassFileStream* st,
+ bool verify,
++ KlassHandle old_class,
+ TRAPS) {
++ bool redefine_classes_locked = false;
++ if (!Thread::current()->redefine_classes_mutex()->owned_by_self()) {
++ Thread::current()->redefine_classes_mutex()->lock();
++ redefine_classes_locked = true;
++ }
++
+ // Classloaders that support parallelism, e.g. bootstrap classloader,
+ // or all classloaders with UnsyncloadClass do not acquire lock here
+ bool DoObjectLock = true;
+@@ -1050,9 +1060,14 @@
+ instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name,
+ class_loader,
+ protection_domain,
++ old_class,
+ parsed_name,
+ verify,
+ THREAD);
++ if (!old_class.is_null() && !k.is_null()) {
++ k->set_redefining(true);
++ k->set_old_version(old_class());
++ }
+
+ const char* pkg = "java/";
+ if (!HAS_PENDING_EXCEPTION &&
+@@ -1087,13 +1102,18 @@
+ // Add class just loaded
+ // If a class loader supports parallel classloading handle parallel define requests
+ // find_or_define_instance_class may return a different instanceKlass
+- if (is_parallelCapable(class_loader)) {
++ // (tw) TODO: for class redefinition the parallel version does not work, check if this is a problem?
++ if (is_parallelCapable(class_loader) && old_class.is_null()) {
+ k = find_or_define_instance_class(class_name, class_loader, k, THREAD);
+ } else {
+- define_instance_class(k, THREAD);
++ define_instance_class(k, old_class, THREAD);
+ }
+ }
+
++ if (redefine_classes_locked) {
++ Thread::current()->redefine_classes_mutex()->unlock();
++ }
++
+ // If parsing the class file or define_instance_class failed, we
+ // need to remove the placeholder added on our behalf. But we
+ // must make sure parsed_name is valid first (it won't be if we had
+@@ -1122,7 +1142,7 @@
+ MutexLocker mu(SystemDictionary_lock, THREAD);
+
+ klassOop check = find_class(parsed_name, class_loader);
+- assert(check == k(), "should be present in the dictionary");
++ assert((check == k() && !k->is_redefining()) || (k->is_redefining() && check == k->old_version()), "should be present in the dictionary");
+
+ klassOop check2 = find_class(h_name, h_loader);
+ assert(check == check2, "name inconsistancy in SystemDictionary");
+@@ -1349,7 +1369,11 @@
+ }
+ }
+
+-void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) {
++void SystemDictionary::rollback_redefinition() {
++ dictionary()->rollback_redefinition();
++}
++
++void SystemDictionary::define_instance_class(instanceKlassHandle k, KlassHandle old_class, TRAPS) {
+
+ Handle class_loader_h(THREAD, k->class_loader());
+
+@@ -1376,13 +1400,23 @@
+ Symbol* name_h = k->name();
+ unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader_h);
+ int d_index = dictionary()->hash_to_index(d_hash);
+- check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK);
++
++ // DCEVM: Update version of the klassOop in the system dictionary
++ // TODO: Check for thread safety!
++ if (!old_class.is_null()) {
++ bool ok = dictionary()->update_klass(d_index, d_hash, name_h, class_loader_h, k, old_class);
++ assert (ok, "must have found old class and updated!");
++ }
++ check_constraints(d_index, d_hash, k, class_loader_h, old_class.is_null(), CHECK);
++
++ if(!old_class.is_null() && TraceRedefineClasses >= 3){ tty->print_cr("Class has been updated!"); }
+
+ // Register class just loaded with class loader (placed in Vector)
+ // Note we do this before updating the dictionary, as this can
+ // fail with an OutOfMemoryError (if it does, we will *not* put this
+ // class in the dictionary and will not update the class hierarchy).
+- if (k->class_loader() != NULL) {
++ // (tw) Only register if not redefining a class.
++ if (k->class_loader() != NULL && old_class.is_null()) {
+ methodHandle m(THREAD, Universe::loader_addClass_method());
+ JavaValue result(T_VOID);
+ JavaCallArguments args(class_loader_h);
+@@ -1408,8 +1442,9 @@
+ }
+ k->eager_initialize(THREAD);
+
++ // (tw) Only notify jvmti if not redefining a class.
+ // notify jvmti
+- if (JvmtiExport::should_post_class_load()) {
++ if (JvmtiExport::should_post_class_load() && old_class.is_null()) {
+ assert(THREAD->is_Java_thread(), "thread->is_Java_thread()");
+ JvmtiExport::post_class_load((JavaThread *) THREAD, k());
+
+@@ -1482,7 +1517,7 @@
+ }
+ }
+
+- define_instance_class(k, THREAD);
++ define_instance_class(k, KlassHandle(), THREAD);
+
+ Handle linkage_exception = Handle(); // null handle
+
+@@ -1613,6 +1648,14 @@
+ Universe::flush_dependents_on(k);
+ }
+
++// (tw) Remove from hierarchy - Undo add_to_hierarchy.
++void SystemDictionary::remove_from_hierarchy(instanceKlassHandle k) {
++ assert(k.not_null(), "just checking");
++
++ k->remove_from_sibling_list();
++
++ // TODO: Remove from interfaces.
++}
+
+ // ----------------------------------------------------------------------------
+ // GC support
+@@ -1702,7 +1745,8 @@
+ }
+
+
+-void SystemDictionary::preloaded_oops_do(OopClosure* f) {
++// (tw) Iterate over all pre-loaded classes in the dictionary.
++void SystemDictionary::preloaded_classes_do(OopClosure *f) {
+ for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) {
+ f->do_oop((oop*) &_well_known_klasses[k]);
+ }
+@@ -1716,6 +1760,23 @@
+ }
+ }
+
++ // TODO: Check if we need to call FilterFieldsMap
++}
++
++void SystemDictionary::preloaded_oops_do(OopClosure* f) {
++ for (int k = (int)FIRST_WKID; k < (int)WKID_LIMIT; k++) {
++ f->do_oop((oop*) &_well_known_klasses[k]);
++ }
++
++ {
++ for (int i = 0; i < T_VOID+1; i++) {
++ if (_box_klasses[i] != NULL) {
++ assert(i >= T_BOOLEAN, "checking");
++ f->do_oop((oop*) &_box_klasses[i]);
++ }
++ }
++ }
++
+ // The basic type mirrors would have already been processed in
+ // Universe::oops_do(), via a call to shared_oops_do(), so should
+ // not be processed again.
+@@ -1734,6 +1795,11 @@
+ dictionary()->classes_do(f);
+ }
+
++// (tw) Iterate over all classes in the dictionary.
++void SystemDictionary::classes_do(ObjectClosure *closure) {
++ dictionary()->classes_do(closure);
++}
++
+ // Added for initialize_itable_for_klass
+ // Just the classes from defining class loaders
+ // Don't iterate over placeholders
+@@ -1870,7 +1936,9 @@
+
+ // Preload ref klasses and set reference types
+ instanceKlass::cast(WK_KLASS(Reference_klass))->set_reference_type(REF_OTHER);
+- instanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass));
++
++ // (tw) This is now done in parseClassFile in order to support class redefinition
++ // instanceRefKlass::update_nonstatic_oop_maps(WK_KLASS(Reference_klass));
+
+ initialize_wk_klasses_through(WK_KLASS_ENUM_NAME(Cleaner_klass), scan, CHECK);
+ instanceKlass::cast(WK_KLASS(SoftReference_klass))->set_reference_type(REF_SOFT);
+@@ -1957,7 +2025,11 @@
+ // also holds array classes
+
+ assert(check->klass_part()->oop_is_instance(), "noninstance in systemdictionary");
+- if ((defining == true) || (k() != check)) {
++ if ((defining == true) && ((k() != check) && k->old_version() != check)) {
++ ResourceMark rm(Thread::current());
++ tty->print_cr("(%d / %d) (%s/%s)", k->revision_number(), check->klass_part()->revision_number(), k->name()->as_C_string(), check->klass_part()->name()->as_C_string());
++ k()->print();
++ check->print();
+ linkage_error = "loader (instance of %s): attempted duplicate class "
+ "definition for name: \"%s\"";
+ } else {
+diff -r 882f6c762ac5 src/share/vm/classfile/systemDictionary.hpp
+--- a/src/share/vm/classfile/systemDictionary.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/classfile/systemDictionary.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -270,7 +270,7 @@
+ // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
+ static klassOop resolve_from_stream(Symbol* class_name, Handle class_loader,
+ Handle protection_domain,
+- ClassFileStream* st, bool verify, TRAPS);
++ ClassFileStream* st, bool verify, KlassHandle old_class, TRAPS);
+
+ // Lookup an already loaded class. If not found NULL is returned.
+ static klassOop find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
+@@ -311,6 +311,8 @@
+ // Iterate over all klasses in dictionary
+ // Just the classes from defining class loaders
+ static void classes_do(void f(klassOop));
++ static void classes_do(ObjectClosure *closure);
++ static void preloaded_classes_do(OopClosure *closure);
+ // Added for initialize_itable_for_klass to handle exceptions
+ static void classes_do(void f(klassOop, TRAPS), TRAPS);
+ // All classes, and their class loaders
+@@ -417,6 +419,8 @@
+ initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
+ }
+
++ static void rollback_redefinition();
++
+ public:
+ #define WK_KLASS_DECLARE(name, symbol, option) \
+ static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); }
+@@ -598,11 +602,11 @@
+ // after waiting, but before reentering SystemDictionary_lock
+ // to preserve lock order semantics.
+ static void double_lock_wait(Handle lockObject, TRAPS);
+- static void define_instance_class(instanceKlassHandle k, TRAPS);
++ static void define_instance_class(instanceKlassHandle k, KlassHandle old_class, TRAPS);
+ static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
+ Handle class_loader,
+ instanceKlassHandle k, TRAPS);
+- static instanceKlassHandle load_shared_class(Symbol* class_name,
++ static instanceKlassHandle load_shared_class(Symbol* class_name, // after waiting, but before reentering SystemDictionary_lock,
+ Handle class_loader, TRAPS);
+ static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
+ Handle class_loader, TRAPS);
+@@ -617,12 +621,16 @@
+ // Setup link to hierarchy
+ static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
+
++public:
++ // Remove link to hierarchy
++ static void remove_from_hierarchy(instanceKlassHandle k);
++
++private:
+ // event based tracing
+ static void post_class_load_event(const Ticks& start_time, instanceKlassHandle k,
+ Handle initiating_loader);
+ static void post_class_unload_events(BoolObjectClosure* is_alive);
+
+-private:
+ // We pass in the hashtable index so we can calculate it outside of
+ // the SystemDictionary_lock.
+
+diff -r 882f6c762ac5 src/share/vm/classfile/verifier.cpp
+--- a/src/share/vm/classfile/verifier.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/classfile/verifier.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -106,7 +106,7 @@
+ return !need_verify;
+ }
+
+-bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, TRAPS) {
++bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, bool may_use_old_verifier, TRAPS) {
+ HandleMark hm;
+ ResourceMark rm(THREAD);
+
+@@ -117,7 +117,8 @@
+
+ const char* klassName = klass->external_name();
+ bool can_failover = FailOverToOldVerifier &&
+- klass->major_version() < NOFAILOVER_MAJOR_VERSION;
++ klass->major_version() < NOFAILOVER_MAJOR_VERSION &&
++ may_use_old_verifier;
+
+ // If the class should be verified, first see if we can use the split
+ // verifier. If not, or if verification fails and FailOverToOldVerifier
+@@ -138,6 +139,7 @@
+ tty->print_cr(
+ "Fail over class verification to old verifier for: %s", klassName);
+ }
++ assert(may_use_old_verifier, "");
+ exception_name = inference_verify(
+ klass, message_buffer, message_buffer_len, THREAD);
+ }
+@@ -145,6 +147,7 @@
+ exception_message = split_verifier.exception_message();
+ }
+ } else {
++ assert(may_use_old_verifier, "");
+ exception_name = inference_verify(
+ klass, message_buffer, message_buffer_len, THREAD);
+ }
+@@ -159,6 +162,9 @@
+ }
+ tty->print_cr("End class verification for: %s", klassName);
+ }
++ } else if (TraceClassInitialization) {
++ // (tw) Output not verified classes
++ tty->print_cr("Class %s was not verified", klassName);
+ }
+
+ if (HAS_PENDING_EXCEPTION) {
+@@ -210,7 +216,7 @@
+ // NOTE: this is called too early in the bootstrapping process to be
+ // guarded by Universe::is_gte_jdk14x_version()/UseNewReflection.
+ (refl_magic_klass == NULL ||
+- !klass->is_subtype_of(refl_magic_klass) ||
++ !(klass->is_subtype_of(refl_magic_klass) || klass->is_subtype_of(refl_magic_klass->klass_part()->newest_version())) ||
+ VerifyReflectionBytecodes)
+ );
+ }
+@@ -517,7 +523,7 @@
+
+ ClassVerifier::ClassVerifier(
+ instanceKlassHandle klass, TRAPS)
+- : _thread(THREAD), _exception_type(NULL), _message(NULL), _klass(klass) {
++ : _thread(THREAD), _exception_type(NULL), _message(NULL), _klass(klass->newest_version()), _klass_to_verify(klass) {
+ _this_type = VerificationType::reference_type(klass->name());
+ // Create list to hold symbols in reference area.
+ _symbols = new GrowableArray<Symbol*>(100, 0, NULL);
+@@ -547,7 +553,7 @@
+ _klass->external_name());
+ }
+
+- objArrayHandle methods(THREAD, _klass->methods());
++ objArrayHandle methods(THREAD, _klass_to_verify->methods());
+ int num_methods = methods->length();
+
+ for (int index = 0; index < num_methods; index++) {
+@@ -2668,7 +2674,10 @@
+ VerificationType stack_object_type =
+ current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
+ if (current_type() != stack_object_type) {
+- assert(cp->cache() == NULL, "not rewritten yet");
++
++ // (tw) TODO: Check if relaxing the following assertion is correct. For class redefinition we might call the verifier twice.
++ //assert(cp->cache() == NULL, "not rewritten yet");
++
+ Symbol* ref_class_name =
+ cp->klass_name_at(cp->klass_ref_index_at(index));
+ // See the comments in verify_field_instructions() for
+diff -r 882f6c762ac5 src/share/vm/classfile/verifier.hpp
+--- a/src/share/vm/classfile/verifier.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/classfile/verifier.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -48,7 +48,7 @@
+ * Otherwise, no exception is thrown and the return indicates the
+ * error.
+ */
+- static bool verify(instanceKlassHandle klass, Mode mode, bool should_verify_class, TRAPS);
++ static bool verify(instanceKlassHandle klass, Mode mode, bool should_verify_class, bool may_use_old_verifier, TRAPS);
+
+ // Return false if the class is loaded by the bootstrap loader,
+ // or if defineClass was called requesting skipping verification
+@@ -257,7 +257,10 @@
+
+ ErrorContext _error_context; // contains information about an error
+
++public:
+ void verify_method(methodHandle method, TRAPS);
++
++private:
+ char* generate_code_data(methodHandle m, u4 code_length, TRAPS);
+ void verify_exception_handler_table(u4 code_length, char* code_data,
+ int& min, int& max, TRAPS);
+@@ -341,6 +344,7 @@
+
+ VerificationType object_type() const;
+
++ instanceKlassHandle _klass_to_verify;
+ instanceKlassHandle _klass; // the class being verified
+ methodHandle _method; // current method being verified
+ VerificationType _this_type; // the verification type of the current class
+diff -r 882f6c762ac5 src/share/vm/classfile/vmSymbols.hpp
+--- a/src/share/vm/classfile/vmSymbols.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/classfile/vmSymbols.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -139,6 +139,10 @@
+ template(tag_annotation_default, "AnnotationDefault") \
+ template(tag_enclosing_method, "EnclosingMethod") \
+ template(tag_bootstrap_methods, "BootstrapMethods") \
++ template(tag_static_field_redefinition_policy, "StaticFieldRedefinitionPolicy") \
++ template(tag_field_redefinition_policy, "FieldRedefinitionPolicy") \
++ template(tag_method_redefinition_policy, "MethodRedefinitionPolicy") \
++ template(tag_code_sections, "CodeSections") \
+ \
+ /* exception klasses: at least all exceptions thrown by the VM have entries here */ \
+ template(java_lang_ArithmeticException, "java/lang/ArithmeticException") \
+@@ -380,6 +384,10 @@
+ template(oop_size_name, "oop_size") \
+ template(static_oop_field_count_name, "static_oop_field_count") \
+ \
++ /* mutator in case of class redefinition */ \
++ template(static_transformer_name, "$staticTransformer") \
++ template(transformer_name, "$transformer") \
++ \
+ /* non-intrinsic name/signature pairs: */ \
+ template(register_method_name, "register") \
+ do_alias(register_method_signature, object_void_signature) \
+diff -r 882f6c762ac5 src/share/vm/compiler/compileBroker.cpp
+--- a/src/share/vm/compiler/compileBroker.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/compiler/compileBroker.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -1181,6 +1181,14 @@
+ int comp_level,
+ methodHandle hot_method, int hot_count,
+ const char* comment, Thread* THREAD) {
++ JavaThread* thread = JavaThread::current();
++ if (thread->is_Compiler_thread() && thread->as_CompilerThread()->should_bailout()) {
++ return NULL; // FIXME: DCEVM: should we do something else?
++ }
++ if (instanceKlass::cast(method->method_holder())->is_not_initialized()) {
++ return NULL; // FIXME: DCEVM: how should we avoid this?
++ }
++
+ // make sure arguments make sense
+ assert(method->method_holder()->klass_part()->oop_is_instance(), "not an instance method");
+ assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
+@@ -1260,6 +1268,7 @@
+ }
+
+ // RedefineClasses() has replaced this method; just return
++ // (tw) This is important for the new version of hotswapping: Old code will only execute properly in the interpreter!
+ if (method->is_old()) {
+ return NULL;
+ }
+@@ -1592,6 +1601,8 @@
+
+ // Never compile a method if breakpoints are present in it
+ if (method()->number_of_breakpoints() == 0) {
++ thread->compilation_mutex()->lock();
++ thread->set_should_bailout(false);
+ // Compile the method.
+ if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
+ #ifdef COMPILER1
+@@ -1615,6 +1626,7 @@
+ // After compilation is disabled, remove remaining methods from queue
+ method->clear_queued_for_compilation();
+ }
++ thread->compilation_mutex()->unlock();
+ }
+ }
+ }
+@@ -2165,3 +2177,15 @@
+ st->cr();
+ #endif
+ }
++
++// (tw) Clean up compiler interface after a class redefinition step
++void CompileBroker::cleanup_after_redefinition() {
++ int num_threads = _method_threads->length();
++
++ ciObjectFactory::sort_ci_objects(ciObjectFactory::_shared_ci_objects);
++ for (int i=0; i<num_threads; i++) {
++ if (_method_threads->at(i)->env() != NULL && _method_threads->at(i)->env() != (ciEnv *)badAddress) {
++ _method_threads->at(i)->env()->cleanup_after_redefinition();
++ }
++ }
++}
+diff -r 882f6c762ac5 src/share/vm/compiler/compileBroker.hpp
+--- a/src/share/vm/compiler/compileBroker.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/compiler/compileBroker.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -408,6 +408,7 @@
+
+ static void print_compiler_threads_on(outputStream* st);
+
++ static void cleanup_after_redefinition();
+ static int get_total_compile_count() { return _total_compile_count; }
+ static int get_total_bailout_count() { return _total_bailout_count; }
+ static int get_total_invalidated_count() { return _total_invalidated_count; }
+diff -r 882f6c762ac5 src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp
+--- a/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -162,6 +162,13 @@
+ }
+ }
+
++
++HeapWord* CompactibleFreeListSpace::forward_compact_top(size_t size,
++ CompactPoint* cp, HeapWord* compact_top) {
++ ShouldNotReachHere();
++ return NULL;
++}
++
+ // Like CompactibleSpace forward() but always calls cross_threshold() to
+ // update the block offset table. Removed initialize_threshold call because
+ // CFLS does not use a block offset array for contiguous spaces.
+diff -r 882f6c762ac5 src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp
+--- a/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -149,6 +149,7 @@
+
+ // Support for compacting cms
+ HeapWord* cross_threshold(HeapWord* start, HeapWord* end);
++ HeapWord* forward_compact_top(size_t size, CompactPoint* cp, HeapWord* compact_top);
+ HeapWord* forward(oop q, size_t size, CompactPoint* cp, HeapWord* compact_top);
+
+ // Initialization helpers.
+diff -r 882f6c762ac5 src/share/vm/gc_implementation/shared/markSweep.cpp
+--- a/src/share/vm/gc_implementation/shared/markSweep.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/gc_implementation/shared/markSweep.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -32,6 +32,8 @@
+ #include "oops/objArrayKlass.inline.hpp"
+ #include "oops/oop.inline.hpp"
+
++GrowableArray<oop>* MarkSweep::_rescued_oops = NULL;
++
+ Stack<oop, mtGC> MarkSweep::_marking_stack;
+ Stack<DataLayout*, mtGC> MarkSweep::_revisit_mdo_stack;
+ Stack<Klass*, mtGC> MarkSweep::_revisit_klass_stack;
+@@ -357,3 +359,86 @@
+ }
+
+ #endif
++
++// (tw) Copy the rescued objects to their destination address after compaction.
++void MarkSweep::copy_rescued_objects_back() {
++
++ if (_rescued_oops != NULL) {
++
++ for (int i=0; i<_rescued_oops->length(); i++) {
++ oop rescued_obj = _rescued_oops->at(i);
++
++ int size = rescued_obj->size();
++ oop new_obj = rescued_obj->forwardee();
++
++ if (rescued_obj->blueprint()->new_version() != NULL) {
++ MarkSweep::update_fields(rescued_obj, new_obj);
++ } else {
++ Copy::aligned_disjoint_words((HeapWord*)rescued_obj, (HeapWord*)new_obj, size);
++ }
++
++ FREE_RESOURCE_ARRAY(HeapWord, rescued_obj, size);
++
++ new_obj->init_mark();
++ assert(new_obj->is_oop(), "must be a valid oop");
++ }
++ _rescued_oops->clear();
++ _rescued_oops = NULL;
++ }
++}
++
++// (tw) Update instances of a class whose fields changed.
++void MarkSweep::update_fields(oop q, oop new_location) {
++
++ assert(q->blueprint()->new_version() != NULL, "class of old object must have new version");
++
++ klassOop old_klass_oop = q->klass();
++ klassOop new_klass_oop = q->blueprint()->new_version();
++
++ instanceKlass *old_klass = instanceKlass::cast(old_klass_oop);
++ instanceKlass *new_klass = instanceKlass::cast(new_klass_oop);
++
++ int size = q->size_given_klass(old_klass);
++ int new_size = q->size_given_klass(new_klass);
++
++ oop tmp_obj = q;
++
++ if (new_klass_oop->klass_part()->is_copying_backwards()) {
++ if (((HeapWord *)q >= (HeapWord *)new_location && (HeapWord *)q < (HeapWord *)new_location + new_size) ||
++ ((HeapWord *)new_location >= (HeapWord *)q && (HeapWord *)new_location < (HeapWord *)q + size)) {
++ tmp_obj = (oop)resource_allocate_bytes(size * HeapWordSize);
++ Copy::aligned_disjoint_words((HeapWord*)q, (HeapWord*)tmp_obj, size);
++ }
++ }
++
++ int *cur = new_klass_oop->klass_part()->update_information();
++
++ tmp_obj->set_klass_no_check(new_klass_oop);
++
++ if (cur == NULL) {
++ assert(size == new_size, "just checking");
++ Copy::conjoint_words(((HeapWord *)tmp_obj), ((HeapWord *)new_location), size);
++ } else {
++ int destOffset = 0;
++ while (*cur != 0) {
++ if (*cur > 0) {
++ int size = *cur;
++ cur++;
++ int offset = *cur;
++ Copy::conjoint_jbytes(((char *)tmp_obj) + offset, ((char *)new_location) + destOffset, size);
++ destOffset += size;
++ cur++;
++ } else {
++ assert(*cur < 0, "");
++ int skip = -*cur;
++ Copy::fill_to_bytes(((char*)new_location) + destOffset, skip, 0);
++ destOffset += skip;
++ cur++;
++ }
++ }
++ }
++
++ if (tmp_obj != q) {
++ FREE_RESOURCE_ARRAY(HeapWord, tmp_obj, size);
++ }
++}
+diff -r 882f6c762ac5 src/share/vm/gc_implementation/shared/markSweep.hpp
+--- a/src/share/vm/gc_implementation/shared/markSweep.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/gc_implementation/shared/markSweep.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -117,8 +117,12 @@
+ friend class AdjustPointerClosure;
+ friend class KeepAliveClosure;
+ friend class VM_MarkSweep;
++ friend class GenMarkSweep;
+ friend void marksweep_init();
+
++public:
++ static GrowableArray<oop>* _rescued_oops;
++
+ //
+ // Vars
+ //
+@@ -208,6 +212,8 @@
+ template <class T> static inline void mark_and_push(T* p);
+ static inline void push_objarray(oop obj, size_t index);
+
++ static void copy_rescued_objects_back();
++ static void update_fields(oop q, oop new_location);
+ static void follow_stack(); // Empty marking stack.
+
+ static void preserve_mark(oop p, markOop mark);
+diff -r 882f6c762ac5 src/share/vm/interpreter/interpreterRuntime.cpp
+--- a/src/share/vm/interpreter/interpreterRuntime.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/interpreter/interpreterRuntime.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -402,7 +402,7 @@
+ assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
+ assert(h_exception->is_oop(), "just checking");
+ // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
+- if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
++ if (!(h_exception->is_a(SystemDictionary::Throwable_klass()->klass_part()->newest_version())) && !(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
+ if (ExitVMOnVerifyError) vm_exit(-1);
+ ShouldNotReachHere();
+ }
+@@ -656,6 +656,82 @@
+ JvmtiExport::post_raw_breakpoint(thread, method, bcp);
+ IRT_END
+
++// (tw) Correctly resolve method when running old code.
++IRT_ENTRY(void, InterpreterRuntime::forward_method(JavaThread *thread))
++ {
++ MonitorLockerEx ml(RedefinitionSync_lock);
++ while (Threads::wait_at_instrumentation_entry()) {
++ ml.wait();
++ }
++ }
++ frame f = last_frame(thread);
++ methodOop m = f.interpreter_frame_method();
++ methodOop forward_method = m->forward_method();
++ if (forward_method != NULL) {
++ int bci = f.interpreter_frame_bci();
++
++ if (TraceRedefineClasses >= 3) {
++ tty->print_cr("Executing NOP in method %s at bci %d %d", m->name()->as_C_string(), bci, m->is_in_code_section(bci + 1));
++ }
++
++ int next_bci = bci - 1;
++ // First try bci before NOP.
++ if (!m->is_in_code_section(next_bci)) {
++ // Try bci after NOP.
++ next_bci = bci + 1;
++ if (!m->is_in_code_section(next_bci)) return;
++ }
++
++ int new_bci = m->calculate_forward_bci(next_bci, forward_method);
++ if (TraceRedefineClasses >= 2) {
++ tty->print_cr("Transferring execution of %s to new method old_bci=%d new_bci=%d", forward_method->name()->as_C_string(), bci, new_bci);
++ }
++ RegisterMap reg_map(thread);
++ vframe* vf = vframe::new_vframe(&f, ®_map, thread);
++ interpretedVFrame *iframe = (interpretedVFrame *)vf;
++ iframe->set_method(forward_method, new_bci - 1);
++ }
++IRT_END
++
++// (tw) Correctly resolve method when running old code.
++IRT_ENTRY(void, InterpreterRuntime::find_correct_method(JavaThread *thread, oopDesc* receiverOop, int vTableIndex))
++ // extract receiver from the outgoing argument list if necessary
++ Handle receiver(thread, receiverOop);
++
++ // TODO: Check for invokeinterface!
++ Bytecodes::Code bytecode = Bytecodes::_invokevirtual;
++
++ int method_holder_revision_number = method(thread)->method_holder()->klass_part()->revision_number();
++ klassOop klass = receiverOop->klass();
++ while (klass->klass_part()->revision_number() > method_holder_revision_number) {
++ klass = klass->klass_part()->old_version();
++ }
++
++ // TODO: Check for correctness if different vtable indices in different versions?
++
++ methodOop method = ((instanceKlass *)klass->klass_part())->method_at_vtable(vTableIndex);
++ thread->set_vm_result(method);
++IRT_END
++
++// Correctly resolve interface method when running old code.
++IRT_ENTRY(void, InterpreterRuntime::find_correct_interface_method(JavaThread *thread, oopDesc* receiverOop, oopDesc* interface_klass, int vTableIndex))
++
++ // extract receiver from the outgoing argument list if necessary
++ Handle receiver(thread, receiverOop);
++
++ // TODO: Check for invokeinterface!
++ Bytecodes::Code bytecode = Bytecodes::_invokevirtual;
++
++ int method_holder_revision_number = method(thread)->method_holder()->klass_part()->revision_number();
++ klassOop klass = receiverOop->klass();
++ while (klass->klass_part()->revision_number() > method_holder_revision_number) {
++ klass = klass->klass_part()->old_version();
++ }
++
++ methodOop method = ((instanceKlass *)klass->klass_part())->method_at_itable((klassOop)interface_klass, vTableIndex, THREAD);
++ thread->set_vm_result(method);
++IRT_END
++
+ IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode)) {
+ // extract receiver from the outgoing argument list if necessary
+ Handle receiver(thread, NULL);
+@@ -684,6 +760,10 @@
+ if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
+ int retry_count = 0;
+ while (info.resolved_method()->is_old()) {
++ // (tw) If we are executing an old method, this is OK!
++ if (method(thread)->is_old()) {
++ break;
++ }
+ // It is very unlikely that method is redefined more than 100 times
+ // in the middle of resolve. If it is looping here more than 100 times
+ // means then there could be a bug here.
+diff -r 882f6c762ac5 src/share/vm/interpreter/interpreterRuntime.hpp
+--- a/src/share/vm/interpreter/interpreterRuntime.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/interpreter/interpreterRuntime.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -141,6 +141,9 @@
+ static void post_method_entry(JavaThread *thread);
+ static void post_method_exit (JavaThread *thread);
+ static int interpreter_contains(address pc);
++ static void forward_method(JavaThread *thread);
++ static void find_correct_method(JavaThread *thread, oopDesc* receiver, int vTableIndex);
++ static void find_correct_interface_method(JavaThread *thread, oopDesc* receiver, oopDesc* interface_klass, int vTableIndex);
+
+ // Native signature handlers
+ static void prepare_native_call(JavaThread* thread, methodOopDesc* method);
+diff -r 882f6c762ac5 src/share/vm/interpreter/linkResolver.cpp
+--- a/src/share/vm/interpreter/linkResolver.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/interpreter/linkResolver.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -153,8 +153,8 @@
+ // Klass resolution
+
+ void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) {
+- if (!Reflection::verify_class_access(ref_klass->as_klassOop(),
+- sel_klass->as_klassOop(),
++ if (!Reflection::verify_class_access(ref_klass->as_klassOop()->klass_part()->newest_version(),
++ sel_klass->as_klassOop()->klass_part()->newest_version(),
+ true)) {
+ ResourceMark rm(THREAD);
+ Exceptions::fthrow(
+@@ -346,7 +346,7 @@
+ // We'll check for the method name first, as that's most likely
+ // to be false (so we'll short-circuit out of these tests).
+ if (sel_method->name() == vmSymbols::clone_name() &&
+- sel_klass() == SystemDictionary::Object_klass() &&
++ sel_klass()->klass_part()->newest_version() == SystemDictionary::Object_klass()->klass_part()->newest_version() &&
+ resolved_klass->oop_is_array()) {
+ // We need to change "protected" to "public".
+ assert(flags.is_protected(), "clone not protected?");
+@@ -412,6 +412,154 @@
+ }
+ }
+
++
++void LinkResolver::lookup_method(methodHandle& resolved_method, KlassHandle resolved_klass,
++ Symbol* method_name, Symbol* method_signature, bool is_interface, KlassHandle current_klass, TRAPS) {
++
++ // Interface method lookup?
++ if (is_interface) {
++
++ // lookup method in this interface or its super, java.lang.Object
++ lookup_instance_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, CHECK);
++
++ if (resolved_method.is_null() && !resolved_klass->oop_is_array()) {
++ // lookup method in all the super-interfaces
++ lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK);
++ }
++
++ // Other methods
++ } else {
++ Handle nested_exception;
++
++ // 2. lookup method in resolved klass and its super klasses
++ lookup_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, CHECK);
++
++ if (resolved_method.is_null() && !resolved_klass->oop_is_array()) { // not found in the class hierarchy
++ // 3. lookup method in all the interfaces implemented by the resolved klass
++ lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK);
++
++ if (resolved_method.is_null()) {
++ // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
++ lookup_polymorphic_method(resolved_method, resolved_klass, method_name, method_signature,
++ current_klass, (Handle*)NULL, (Handle*)NULL, THREAD);
++ if (HAS_PENDING_EXCEPTION) {
++ nested_exception = Handle(THREAD, PENDING_EXCEPTION);
++ CLEAR_PENDING_EXCEPTION;
++ }
++ }
++ }
++ }
++}
++
++void LinkResolver::lookup_correct_field(fieldDescriptor &fd, KlassHandle &sel_klass, KlassHandle resolved_klass, KlassHandle current_klass, Symbol* field_name, Symbol* field_sig, bool is_static) {
++
++ // First attempt unversioned
++ sel_klass = KlassHandle(Thread::current(), resolved_klass->find_field(field_name, field_sig, &fd));
++
++ if (!current_klass.is_null() && !current_klass->is_newest_version()) {
++
++ // Look for the policy defined in the new version of the class (_not_ in the newest, but only in the newer relative to current klass).
++ int redefinition_policy = current_klass->new_version()->klass_part()->field_redefinition_policy();
++ if (is_static) {
++ redefinition_policy = current_klass->new_version()->klass_part()->static_field_redefinition_policy();
++ }
++
++ assert(redefinition_policy != Klass::StaticCheck, "if the policy is static check, then we can never reach here");
++
++ if (redefinition_policy != Klass::DynamicCheck) {
++
++ if (redefinition_policy == Klass::AccessOldMembers) {
++ // Forget looked up fields
++ sel_klass = KlassHandle(Thread::current(), (oop)NULL);
++ }
++
++ assert(redefinition_policy == Klass::AccessOldMembers || redefinition_policy == Klass::AccessDeletedMembers, "");
++
++ if (sel_klass.is_null() || fd.is_static() != is_static /* access old static field field is changed from static to non-static */) {
++
++ // Select correct version for resolved klass.
++ find_correct_resolved_klass(resolved_klass, current_klass);
++
++ sel_klass = KlassHandle(Thread::current(), instanceKlass::cast(resolved_klass())->find_field(field_name, field_sig, &fd));
++
++ // FIXME: idubrov
++ //if (sel_klass.is_null()) {
++ // TRACE_RC2("Trying to resolve field (%s) in old universe failed => exception is the correct behaviour", field_name->as_C_string());
++ //} else {
++ // assert(sel_klass->new_version() != NULL, "must be old class!");
++ // TRACE_RC2("Resolved a field in the old universe (%s)!", field_name->as_C_string());
++ //}
++ }
++ }
++ }
++}
++
++void LinkResolver::lookup_correct_method(methodHandle& resolved_method, KlassHandle resolved_klass, KlassHandle current_klass,
++ Symbol* method_name, Symbol* method_signature, bool is_interface, TRAPS) {
++
++ // First attempt unversioned
++ lookup_method(resolved_method, resolved_klass, method_name, method_signature, is_interface, current_klass, CHECK);
++
++ // (tw) Are we in an old method that wants to see a different view on the world?
++ if (!current_klass.is_null() && !current_klass->is_newest_version()) {
++
++ // Look for the policy defined in the new version of the class (_not_ in the newest, but only in the newer relative to current klass).
++ int method_redefinition_policy = current_klass->new_version()->klass_part()->method_redefinition_policy();
++ assert(method_redefinition_policy != Klass::StaticCheck, "if the policy is static check, then we can never reach here");
++
++ if (method_redefinition_policy != Klass::DynamicCheck) {
++
++ // We do not throw the exception
++ if (method_redefinition_policy == Klass::AccessOldMembers) {
++ // Forget any new member lookup
++ resolved_method = methodHandle(THREAD, NULL);
++ }
++
++ assert(method_redefinition_policy == Klass::AccessOldMembers || method_redefinition_policy == Klass::AccessDeletedMembers, "");
++
++ if (resolved_method.is_null()) {
++
++ // Select correct version for resolved klass.
++ find_correct_resolved_klass(resolved_klass, current_klass);
++
++ // Now do the lookup in a second attempt with a different resolved klass.
++ lookup_method(resolved_method, resolved_klass, method_name, method_signature, is_interface, current_klass, CHECK);
++
++ // FIXME: idubrov
++ //IF_TRACE_RC2 {
++ // ResourceMark rm(THREAD);
++ // if (resolved_method.is_null()) {
++ // TRACE_RC2("Trying to resolve method (%s) in old universe failed => exception is the correct behaviour", method_name->as_C_string());
++ // } else {
++ // assert(resolved_method->is_old(), "must be old method!");
++ // TRACE_RC2("Resolved a method in the old universe (%s)!", resolved_method->name()->as_C_string());
++ // }
++ //}
++ }
++ }
++ }
++
++ if (resolved_method.is_null()) {
++ // no method found
++ ResourceMark rm(THREAD);
++ THROW_MSG(vmSymbols::java_lang_NoSuchMethodError(),
++ methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
++ method_name,
++ method_signature));
++ }
++}
++
++void LinkResolver::find_correct_resolved_klass(KlassHandle &resolved_klass, KlassHandle ¤t_klass) {
++ int current_klass_revision = current_klass->revision_number();
++ int resolved_klass_revision = resolved_klass->revision_number();
++ // FIXME: idubrov
++ //TRACE_RC2("The two different revision numbers for interfaces: current=%d / resolved_callee=%d", current_klass_revision, resolved_klass_revision);
++
++ while (resolved_klass->revision_number() > current_klass_revision) {
++ assert(resolved_klass->old_version(), "must have old version");
++ resolved_klass = KlassHandle(Thread::current(), resolved_klass->old_version());
++ }
++}
+ void LinkResolver::resolve_method(methodHandle& resolved_method, KlassHandle resolved_klass,
+ Symbol* method_name, Symbol* method_signature,
+ KlassHandle current_klass, bool check_access, TRAPS) {
+@@ -424,35 +572,8 @@
+ THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
+ }
+
+- Handle nested_exception;
+-
+- // 2. lookup method in resolved klass and its super klasses
+- lookup_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, CHECK);
+-
+- if (resolved_method.is_null() && !resolved_klass->oop_is_array()) { // not found in the class hierarchy
+- // 3. lookup method in all the interfaces implemented by the resolved klass
+- lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK);
+-
+- if (resolved_method.is_null()) {
+- // JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
+- lookup_polymorphic_method(resolved_method, resolved_klass, method_name, method_signature,
+- current_klass, (Handle*)NULL, (Handle*)NULL, THREAD);
+- if (HAS_PENDING_EXCEPTION) {
+- nested_exception = Handle(THREAD, PENDING_EXCEPTION);
+- CLEAR_PENDING_EXCEPTION;
+- }
+- }
+- }
+-
+- if (resolved_method.is_null()) {
+- // 4. method lookup failed
+- ResourceMark rm(THREAD);
+- THROW_MSG_CAUSE(vmSymbols::java_lang_NoSuchMethodError(),
+- methodOopDesc::name_and_sig_as_C_string(Klass::cast(resolved_klass()),
+- method_name,
+- method_signature),
+- nested_exception);
+- }
++ // 2. and 3. and 4. lookup method in resolved klass and its super klasses
++ lookup_correct_method(resolved_method, resolved_klass, current_klass, method_name, method_signature, false, CHECK);
+
+ // 5. check if method is concrete
+ if (resolved_method->is_abstract() && !resolved_klass->is_abstract()) {
+@@ -520,7 +641,10 @@
+ }
+
+ // lookup method in this interface or its super, java.lang.Object
+- lookup_instance_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, CHECK);
++ lookup_correct_method(resolved_method, resolved_klass, current_klass, method_name, method_signature, true, CHECK);
++
++
++
+
+ if (resolved_method.is_null() && !resolved_klass->oop_is_array()) {
+ // lookup method in all the super-interfaces
+@@ -621,9 +745,14 @@
+ THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
+ }
+
++ KlassHandle ref_klass(THREAD, pool->pool_holder()->klass_part());
++
+ // Resolve instance field
+ fieldDescriptor fd; // find_field initializes fd if found
+- KlassHandle sel_klass(THREAD, resolved_klass->find_field(field, sig, &fd));
++
++ KlassHandle sel_klass;
++ lookup_correct_field(fd, sel_klass, resolved_klass, ref_klass, field, sig, is_static);
++
+ // check if field exists; i.e., if a klass containing the field def has been selected
+ if (sel_klass.is_null()){
+ ResourceMark rm(THREAD);
+@@ -631,7 +760,6 @@
+ }
+
+ // check access
+- KlassHandle ref_klass(THREAD, pool->pool_holder());
+ check_field_accessability(ref_klass, resolved_klass, sel_klass, fd, CHECK);
+
+ // check for errors
+@@ -643,7 +771,7 @@
+ }
+
+ // Final fields can only be accessed from its own class.
+- if (is_put && fd.access_flags().is_final() && sel_klass() != pool->pool_holder()) {
++ if (is_put && fd.access_flags().is_final() && sel_klass() != pool->pool_holder()->klass_part()->active_version() && sel_klass() != pool->pool_holder()) {
+ THROW(vmSymbols::java_lang_IllegalAccessError());
+ }
+
+@@ -848,7 +976,7 @@
+ bool check_access, bool check_null_and_abstract, TRAPS) {
+ methodHandle resolved_method;
+ linktime_resolve_virtual_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
+- runtime_resolve_virtual_method(result, resolved_method, resolved_klass, recv, receiver_klass, check_null_and_abstract, CHECK);
++ runtime_resolve_virtual_method(result, resolved_method, resolved_klass, recv, receiver_klass, current_klass, check_null_and_abstract, CHECK);
+ }
+
+ // throws linktime exceptions
+@@ -878,6 +1006,7 @@
+ KlassHandle resolved_klass,
+ Handle recv,
+ KlassHandle recv_klass,
++ KlassHandle current_klass,
+ bool check_null_and_abstract,
+ TRAPS) {
+
+@@ -926,10 +1055,44 @@
+ // recv_klass might be an arrayKlassOop but all vtables start at
+ // the same place. The cast is to avoid virtual call and assertion.
+ instanceKlass* inst = (instanceKlass*)recv_klass()->klass_part();
+- selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
++
++ // (tw) The type of the virtual method call and the type of the receiver do not need to
++ // have anything in common, as the receiver type could've been hotswapped.
++ // Does not always work (method could be resolved with correct dynamic type and later
++ // be called at the same place with a wrong dynamic type).
++ // (tw) TODO: Need to handle the static type vs dynamic type issue more generally.
++
++ // The vTable must be based on the view of the world of the resolved method
++ klassOop method_holder = resolved_method->method_holder();
++
++ if (method_holder->klass_part()->new_version() != NULL) {
++ // We are executing in old code
++ // FIXME: idubrov
++ //TRACE_RC2("Calling a method in old code");
++ while (method_holder->klass_part()->revision_number() < inst->revision_number()) {
++ inst = (instanceKlass *)(inst->old_version()->klass_part());
++ }
++ }
++
++ if (inst->is_subtype_of(method_holder)) {
++ selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
++ } else {
++
++ tty->print_cr("Failure:");
++ inst->as_klassOop()->print();
++ inst->super()->print();
++ juint off = inst->super_check_offset();
++ klassOop sup = *(klassOop*)( (address)inst->as_klassOop() + off );
++ sup->print();
++ method_holder->print();
++
++ bool b = inst->is_subtype_of(method_holder);
++ THROW_MSG(vmSymbols::java_lang_NoSuchMethodError(), "(tw) A virtual method was called, but the type of the receiver is not related with the type of the class of the called method!");
++ }
+ }
+ }
+
++
+ // check if method exists
+ if (selected_method.is_null()) {
+ ResourceMark rm(THREAD);
+diff -r 882f6c762ac5 src/share/vm/interpreter/linkResolver.hpp
+--- a/src/share/vm/interpreter/linkResolver.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/interpreter/linkResolver.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -110,7 +110,11 @@
+ // It does all necessary link-time checks & throws exceptions if necessary.
+
+ class LinkResolver: AllStatic {
+- private:
++private:
++ static void lookup_method (methodHandle& result, KlassHandle resolved_klass, Symbol* name, Symbol* signature, bool is_interface, KlassHandle current_klass, TRAPS);
++ static void lookup_correct_field (fieldDescriptor &fd, KlassHandle &sel_klass, KlassHandle resolved_klass, KlassHandle current_klass, Symbol* field_name, Symbol* field_sig, bool is_static);
++ static void lookup_correct_method (methodHandle& result, KlassHandle resolved_klass, KlassHandle current_klass, Symbol* name, Symbol* signature, bool is_interface, TRAPS);
++ static void find_correct_resolved_klass (KlassHandle &resolved_klass, KlassHandle ¤t_klass);
+ static void lookup_method_in_klasses (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
+ static void lookup_instance_method_in_klasses (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
+ static void lookup_method_in_interfaces (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
+@@ -133,7 +137,7 @@
+ static void linktime_resolve_interface_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS);
+
+ static void runtime_resolve_special_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, KlassHandle current_klass, bool check_access, TRAPS);
+- static void runtime_resolve_virtual_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, Handle recv, KlassHandle recv_klass, bool check_null_and_abstract, TRAPS);
++ static void runtime_resolve_virtual_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, Handle recv, KlassHandle recv_klass, KlassHandle current_klass, bool check_null_and_abstract, TRAPS);
+ static void runtime_resolve_interface_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, Handle recv, KlassHandle recv_klass, bool check_null_and_abstract, TRAPS);
+
+ static void check_field_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, fieldDescriptor& fd, TRAPS);
+diff -r 882f6c762ac5 src/share/vm/interpreter/templateTable.hpp
+--- a/src/share/vm/interpreter/templateTable.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/interpreter/templateTable.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -329,8 +329,8 @@
+ static void shouldnotreachhere();
+
+ // jvmti support
+- static void jvmti_post_field_access(Register cache, Register index, bool is_static, bool has_tos);
+- static void jvmti_post_field_mod(Register cache, Register index, bool is_static);
++ static void jvmti_post_field_access(Register cache, Register index, int byte_no, bool is_static, bool has_tos);
++ static void jvmti_post_field_mod(Register cache, Register index, int byte_no, bool is_static);
+ static void jvmti_post_fast_field_mod();
+
+ // debugging of TemplateGenerator
+diff -r 882f6c762ac5 src/share/vm/memory/genMarkSweep.cpp
+--- a/src/share/vm/memory/genMarkSweep.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/memory/genMarkSweep.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -421,6 +421,7 @@
+ // in the same order in phase2, phase3 and phase4. We don't quite do that
+ // here (perm_gen first rather than last), so we tell the validate code
+ // to use a higher index (saved from phase2) when verifying perm_gen.
++ assert(_rescued_oops == NULL, "must be empty before processing");
+ GenCollectedHeap* gch = GenCollectedHeap::heap();
+ Generation* pg = gch->perm_gen();
+
+@@ -433,10 +434,14 @@
+
+ VALIDATE_MARK_SWEEP_ONLY(reset_live_oop_tracking(false));
+
++ MarkSweep::copy_rescued_objects_back();
++
+ GenCompactClosure blk;
+ gch->generation_iterate(&blk, true);
+
+ VALIDATE_MARK_SWEEP_ONLY(compaction_complete());
+
++ MarkSweep::copy_rescued_objects_back();
++
+ pg->post_compact(); // Shared spaces verification.
+ }
+diff -r 882f6c762ac5 src/share/vm/memory/permGen.cpp
+--- a/src/share/vm/memory/permGen.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/memory/permGen.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -57,7 +57,12 @@
+
+ for (;;) {
+ {
+- MutexLocker ml(Heap_lock);
++ // (tw) Only lock when not at a safepoint (necessary to use the split verifier from the VmThread)
++ Monitor *lock = Heap_lock;
++ if (SafepointSynchronize::is_at_safepoint()) {
++ lock = NULL;
++ }
++ MutexLockerEx ml(lock);
+ if ((obj = gen->allocate(size, false)) != NULL) {
+ return obj;
+ }
+diff -r 882f6c762ac5 src/share/vm/memory/space.cpp
+--- a/src/share/vm/memory/space.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/memory/space.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -378,6 +378,31 @@
+ _compaction_top = bottom();
+ }
+
++// (tw) Calculates the compact_top that will be used for placing the next object with the giving size on the heap.
++HeapWord* CompactibleSpace::forward_compact_top(size_t size,
++CompactPoint* cp, HeapWord* compact_top) {
++ // First check if we should switch compaction space
++ assert(this == cp->space, "'this' should be current compaction space.");
++ size_t compaction_max_size = pointer_delta(end(), compact_top);
++ while (size > compaction_max_size) {
++ // switch to next compaction space
++ cp->space->set_compaction_top(compact_top);
++ cp->space = cp->space->next_compaction_space();
++ if (cp->space == NULL) {
++ cp->gen = GenCollectedHeap::heap()->prev_gen(cp->gen);
++ assert(cp->gen != NULL, "compaction must succeed");
++ cp->space = cp->gen->first_compaction_space();
++ assert(cp->space != NULL, "generation must have a first compaction space");
++ }
++ compact_top = cp->space->bottom();
++ cp->space->set_compaction_top(compact_top);
++ cp->threshold = cp->space->initialize_threshold();
++ compaction_max_size = pointer_delta(cp->space->end(), compact_top);
++ }
++
++ return compact_top;
++}
++
+ HeapWord* CompactibleSpace::forward(oop q, size_t size,
+ CompactPoint* cp, HeapWord* compact_top) {
+ // q is alive
+@@ -401,7 +426,7 @@
+ }
+
+ // store the forwarding pointer into the mark word
+- if ((HeapWord*)q != compact_top) {
++ if ((HeapWord*)q != compact_top || (size_t)q->size() != size) {
+ q->forward_to(oop(compact_top));
+ assert(q->is_gc_marked(), "encoding the pointer should preserve the mark");
+ } else {
+@@ -449,7 +474,208 @@
+
+ // Faster object search.
+ void ContiguousSpace::prepare_for_compaction(CompactPoint* cp) {
+- SCAN_AND_FORWARD(cp, top, block_is_always_obj, obj_size);
++ if (!Universe::is_redefining_gc_run()) {
++ SCAN_AND_FORWARD(cp, top, block_is_always_obj, obj_size);
++ return;
++ }
++
++ /* Compute the new addresses for the live objects and store it in the mark
++ * Used by universe::mark_sweep_phase2()
++ */
++ HeapWord* compact_top; /* This is where we are currently compacting to. */
++
++ /* We're sure to be here before any objects are compacted into this
++ * space, so this is a good time to initialize this:
++ */
++ set_compaction_top(bottom());
++
++ if (cp->space == NULL) {
++ assert(cp->gen != NULL, "need a generation");
++ assert(cp->threshold == NULL, "just checking");
++ assert(cp->gen->first_compaction_space() == this, "just checking");
++ cp->space = cp->gen->first_compaction_space();
++ compact_top = cp->space->bottom();
++ cp->space->set_compaction_top(compact_top);
++ cp->threshold = cp->space->initialize_threshold();
++ } else {
++ compact_top = cp->space->compaction_top();
++ }
++
++ /* We allow some amount of garbage towards the bottom of the space, so
++ * we don't start compacting before there is a significant gain to be made.
++ * Occasionally, we want to ensure a full compaction, which is determined
++ * by the MarkSweepAlwaysCompactCount parameter.
++ */
++ int invocations = SharedHeap::heap()->perm_gen()->stat_record()->invocations;
++ bool skip_dead = (MarkSweepAlwaysCompactCount < 1)
++ ||((invocations % MarkSweepAlwaysCompactCount) != 0);
++
++ size_t allowed_deadspace = 0;
++ if (skip_dead) {
++ int ratio = (int)allowed_dead_ratio();
++ allowed_deadspace = (capacity() * ratio / 100) / HeapWordSize;
++ }
++
++ HeapWord* q = bottom();
++ HeapWord* t = end();
++
++ HeapWord* end_of_live= q; /* One byte beyond the last byte of the last
++ live object. */
++ HeapWord* first_dead = end();/* The first dead object. */
++ LiveRange* liveRange = NULL; /* The current live range, recorded in the
++ first header of preceding free area. */
++ _first_dead = first_dead;
++
++ const intx interval = PrefetchScanIntervalInBytes;
++
++ while (q < t) {
++ assert(!block_is_obj(q) ||
++ oop(q)->mark()->is_marked() || oop(q)->mark()->is_unlocked() ||
++ oop(q)->mark()->has_bias_pattern(),
++ "these are the only valid states during a mark sweep");
++ if (block_is_obj(q) && oop(q)->is_gc_marked()) {
++ /* prefetch beyond q */
++ Prefetch::write(q, interval);
++ /* size_t size = oop(q)->size(); changing this for cms for perm gen */
++ size_t size = block_size(q);
++
++ // DCEVM: begin
++ //////////////////////////////////////////////////////////////////////////
++ size_t forward_size = size;
++
++ // Compute the forward sizes and leave out objects whose position could
++ // possibly overlap other objects.
++
++ // DCEVM: There is a new version of the class of q => different size
++ if (oop(q)->blueprint()->new_version() != NULL && oop(q)->blueprint()->new_version()->klass_part()->update_information() != NULL) {
++
++ size_t new_size = oop(q)->size_given_klass(oop(q)->blueprint()->new_version()->klass_part());
++ assert(size != new_size || oop(q)->is_perm(), "instances without changed size have to be updated prior to GC run");
++ forward_size = new_size;
++ }
++
++ compact_top = cp->space->forward_compact_top(forward_size, cp, compact_top);
++
++ bool rescueing = false;
++ if (rescueing = must_rescue(oop(q), oop(compact_top))) {
++ if (MarkSweep::_rescued_oops == NULL) {
++ MarkSweep::_rescued_oops = new GrowableArray<oop>(128);
++ }
++ // FIXME: idubrov
++ //TRACE_RC5("rescue obj %d klass=%s", MarkSweep::_rescued_oops->length(), oop(q)->klass()->klass_part()->name()->as_C_string());
++ MarkSweep::_rescued_oops->append(oop(q));
++ } else {
++ compact_top = cp->space->forward(oop(q), forward_size, cp, compact_top);
++ }
++
++ if ((size != forward_size || rescueing) && q < first_dead) {
++ // (tw) This object moves => first_dead must be set to here!
++ first_dead = q;
++ }
++ //////////////////////////////////////////////////////////////////////////
++ q += size;
++ end_of_live = q;
++ } else {
++ /* run over all the contiguous dead objects */
++ HeapWord* end = q;
++ do {
++ /* prefetch beyond end */
++ Prefetch::write(end, interval);
++ end += block_size(end);
++ } while (end < t && (!block_is_obj(end) || !oop(end)->is_gc_marked()));
++
++ /* see if we might want to pretend this object is alive so that
++ * we don't have to compact quite as often.
++ */
++ if (allowed_deadspace > 0 && q == compact_top) {
++ size_t sz = pointer_delta(end, q);
++ if (insert_deadspace(allowed_deadspace, q, sz)) {
++ compact_top = cp->space->forward(oop(q), sz, cp, compact_top);
++ q = end;
++ end_of_live = end;
++ continue;
++ }
++ }
++
++ /* otherwise, it really is a free region. */
++
++ /* for the previous LiveRange, record the end of the live objects. */
++ if (liveRange) {
++ liveRange->set_end(q);
++ }
++
++ /* record the current LiveRange object.
++ * liveRange->start() is overlaid on the mark word.
++ */
++ liveRange = (LiveRange*)q;
++ liveRange->set_start(end);
++ liveRange->set_end(end);
++
++ /* see if this is the first dead region. */
++ if (q < first_dead) {
++ first_dead = q;
++ }
++
++ /* move on to the next object */
++ q = end;
++ }
++ }
++
++ //////////////////////////////////////////////////////////////////////////
++ // Compute the forwarding addresses for the objects that need to be
++ // rescued.
++ // TODO: empty the _rescued_oops after ALL spaces are compacted!
++ if (MarkSweep::_rescued_oops != NULL) {
++ // FIXME: idubrov
++ //TRACE_RC2("Calculating new forward sizes for %d objects!", MarkSweep::_rescued_oops->length());
++
++ for (int i=0; i<MarkSweep::_rescued_oops->length(); i++) {
++ oop q = MarkSweep::_rescued_oops->at(i);
++
++ /* size_t size = oop(q)->size(); changing this for cms for perm gen */
++ size_t size = block_size((HeapWord*)q);
++
++ size_t forward_size = size;
++
++ // (tw) There is a new version of the class of q => different size
++ if (oop(q)->blueprint()->new_version() != NULL) {
++
++ size_t new_size = oop(q)->size_given_klass(oop(q)->blueprint()->new_version()->klass_part());
++ assert(size != new_size || oop(q)->is_perm(), "instances without changed size have to be updated prior to GC run");
++ forward_size = new_size;
++ }
++
++ compact_top = cp->space->forward(oop(q), forward_size, cp, compact_top);
++ assert(compact_top <= t, "must not write over end of space!");
++ }
++ MarkSweep::_rescued_oops->clear();
++ MarkSweep::_rescued_oops = NULL;
++ }
++ //////////////////////////////////////////////////////////////////////////
++
++ assert(q == t, "just checking");
++ if (liveRange != NULL) {
++ liveRange->set_end(q);
++ }
++ _end_of_live = end_of_live;
++ if (end_of_live < first_dead) {
++ first_dead = end_of_live;
++ }
++ _first_dead = first_dead;
++
++// FIXME: idubrov
++// if (_first_dead > top()) {
++// _first_dead = top();
++// }
++//
++// if (_end_of_live > top()) {
++// _end_of_live = top();
++// }
++ assert(_first_dead <= top(), "Must be smaller equal");
++ assert(_end_of_live <= top(), "Must be smaller equal");
++
++ /* save the compaction_top of the compaction space. */
++ cp->space->set_compaction_top(compact_top);
+ }
+
+ void Space::adjust_pointers() {
+@@ -490,17 +716,313 @@
+ assert(q == t, "just checking");
+ }
+
++
++#ifdef ASSERT
++
++int CompactibleSpace::space_index(oop obj) {
++ GenCollectedHeap* heap = GenCollectedHeap::heap();
++
++ if (heap->is_in_permanent(obj)) {
++ return -1;
++ }
++
++ int index = 0;
++ for (int i = heap->n_gens() - 1; i >= 0; i--) {
++ Generation* gen = heap->get_gen(i);
++ CompactibleSpace* space = gen->first_compaction_space();
++ while (space != NULL) {
++ if (space->is_in_reserved(obj)) {
++ return index;
++ }
++ space = space->next_compaction_space();
++ index++;
++ }
++ }
++
++ tty->print_cr("could not compute space_index for %08xh", obj);
++ index = 0;
++ for (int i = heap->n_gens() - 1; i >= 0; i--) {
++ Generation* gen = heap->get_gen(i);
++ tty->print_cr(" generation %s: %08xh - %08xh", gen->name(), gen->reserved().start(), gen->reserved().end());
++
++ CompactibleSpace* space = gen->first_compaction_space();
++ while (space != NULL) {
++ tty->print_cr(" %2d space %08xh - %08xh", index, space->bottom(), space->end());
++ space = space->next_compaction_space();
++ index++;
++ }
++ }
++
++ ShouldNotReachHere();
++ return 0;
++}
++#endif
++
++bool CompactibleSpace::must_rescue(oop old_obj, oop new_obj) {
++
++ assert(is_in_reserved(old_obj), "old_obj must be in this space");
++
++ if (old_obj->is_perm()) {
++ // This object is in perm gen; check for invariant obj->klass() <= obj
++ if (oop(old_obj)->blueprint()->new_version() != NULL) {
++ return true;
++ }
++ }
++
++ int size = old_obj->size();
++ int original_size = size;
++ if (oop(old_obj)->blueprint()->is_redefining()) {
++ assert(oop(old_obj)->blueprint()->old_version() != NULL, "must not be null");
++ original_size = oop(old_obj)->size_given_klass(oop(old_obj)->blueprint()->old_version()->klass_part());
++ } else if (oop(old_obj)->blueprint()->new_version() != NULL) {
++ size = oop(old_obj)->size_given_klass(oop(old_obj)->blueprint()->new_version()->klass_part());
++ }
++
++ bool normalComparison = (old_obj + original_size < new_obj + size);
++
++ if (is_in_reserved(new_obj)) {
++ // Old and new address are in same space, so just compare the address.
++ // Must rescue if object moves towards the top of the space.
++ assert(space_index(old_obj) == space_index(new_obj), "old_obj and new_obj must be in same space");
++ return normalComparison;
++
++ } else {
++
++ assert(space_index(old_obj) != space_index(new_obj), "old_obj and new_obj must be in different spaces");
++
++ Generation* tenured_gen = GenCollectedHeap::heap()->get_gen(1);
++ if (tenured_gen->is_in_reserved(new_obj)) {
++ // Must never rescue when moving from the new into the old generation.
++ assert(GenCollectedHeap::heap()->get_gen(0)->is_in_reserved(old_obj), "old_obj must be in DefNewGeneration");
++ assert(space_index(old_obj) > space_index(new_obj), "must be");
++ return false;
++
++ } else if (tenured_gen->is_in_reserved(old_obj)) {
++ // Must always rescue when moving from the old into the new generation.
++ assert(GenCollectedHeap::heap()->get_gen(0)->is_in_reserved(new_obj), "new_obj must be in DefNewGeneration");
++ assert(space_index(old_obj) < space_index(new_obj), "must be");
++ return true;
++
++ } else {
++ // In the new generation, eden is located before the from space, so a
++ // simple pointer comparison is sufficient.
++ assert(GenCollectedHeap::heap()->get_gen(0)->is_in_reserved(old_obj), "old_obj must be in DefNewGeneration");
++ assert(GenCollectedHeap::heap()->get_gen(0)->is_in_reserved(new_obj), "new_obj must be in DefNewGeneration");
++ assert((normalComparison) == (space_index(old_obj) < space_index(new_obj)), "slow and fast computation must yield same result");
++ return normalComparison;
++ }
++ }
++}
++
++oop CompactibleSpace::rescue(oop old_obj) {
++ assert(must_rescue(old_obj, old_obj->forwardee()), "do not call otherwise");
++
++ int size = old_obj->size();
++ oop rescued_obj = (oop)resource_allocate_bytes(size * HeapWordSize);
++ Copy::aligned_disjoint_words((HeapWord*)old_obj, (HeapWord*)rescued_obj, size);
++
++ if (MarkSweep::_rescued_oops == NULL) {
++ MarkSweep::_rescued_oops = new GrowableArray<oop>(128);
++ }
++
++ MarkSweep::_rescued_oops->append(rescued_obj);
++ return rescued_obj;
++}
++
+ void CompactibleSpace::adjust_pointers() {
+ // Check first is there is any work to do.
+ if (used() == 0) {
+ return; // Nothing to do.
+ }
++ /* adjust all the interior pointers to point at the new locations of objects
++ * Used by MarkSweep::mark_sweep_phase3() */
+
+- SCAN_AND_ADJUST_POINTERS(adjust_obj_size);
++ HeapWord* q = bottom();
++ HeapWord* t = _end_of_live; /* Established by "prepare_for_compaction". */
++
++ assert(_first_dead <= _end_of_live, "Stands to reason, no?");
++
++ debug_only(HeapWord* prev_q = NULL);
++ debug_only(HeapWord* prev_prev_q = NULL);
++ debug_only(HeapWord* prev_prev_prev_q = NULL);
++ if (q < t && _first_dead > q &&
++ !oop(q)->is_gc_marked()) {
++ /* we have a chunk of the space which hasn't moved and we've
++ * reinitialized the mark word during the previous pass, so we can't
++ * use is_gc_marked for the traversal. */
++ HeapWord* end = _first_dead;
++
++ while (q < end) {
++ /* I originally tried to conjoin "block_start(q) == q" to the
++ * assertion below, but that doesn't work, because you can't
++ * accurately traverse previous objects to get to the current one
++ * after their pointers (including pointers into permGen) have been
++ * updated, until the actual compaction is done. dld, 4/00 */
++ assert(block_is_obj(q),
++ "should be at block boundaries, and should be looking at objs");
++
++ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::track_interior_pointers(oop(q)));
++
++ /* point all the oops to the new location */
++ size_t size = oop(q)->adjust_pointers();
++ size = adjust_obj_size(size);
++
++ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::check_interior_pointers());
++ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::validate_live_oop(oop(q), size));
++
++ debug_only(prev_prev_prev_q = prev_prev_q);
++ debug_only(prev_prev_q = prev_q);
++ debug_only(prev_q = q);
++ q += size;
++ }
++
++ // (tw) first_dead can be live object!
++ q = _first_dead;
++
++// if (_first_dead == t) {
++// q = t;
++// } else {
++// /* $$$ This is funky. Using this to read the previously written
++// * LiveRange. See also use below. */
++// q = (HeapWord*)oop(_first_dead)->mark()->decode_pointer();
++// }
++ }
++
++ const intx interval = PrefetchScanIntervalInBytes;
++
++ debug_only(prev_q = NULL);
++ debug_only(prev_prev_q = NULL);
++ debug_only(prev_prev_prev_q = NULL);
++ while (q < t) {
++ /* prefetch beyond q */
++ Prefetch::write(q, interval);
++ if (oop(q)->is_gc_marked()) {
++ /* q is alive */
++ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::track_interior_pointers(oop(q)));
++ /* point all the oops to the new location */
++ size_t size = oop(q)->adjust_pointers();
++ size = adjust_obj_size(size);
++ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::check_interior_pointers());
++ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::validate_live_oop(oop(q), size));
++ debug_only(prev_prev_prev_q = prev_prev_q);
++ debug_only(prev_prev_q = prev_q);
++ debug_only(prev_q = q);
++ q += size;
++ } else {
++ /* q is not a live object, so its mark should point at the next
++ * live object */
++ debug_only(prev_prev_prev_q = prev_prev_q);
++ debug_only(prev_prev_q = prev_q);
++ debug_only(prev_q = q);
++ q = (HeapWord*) oop(q)->mark()->decode_pointer();
++ assert(q > prev_q, "we should be moving forward through memory");
++ }
++ }
++
++ assert(q == t, "just checking");
+ }
+
+ void CompactibleSpace::compact() {
+- SCAN_AND_COMPACT(obj_size);
++
++ if(!Universe::is_redefining_gc_run()) {
++ SCAN_AND_COMPACT(obj_size);
++ return;
++ }
++
++ /* Copy all live objects to their new location
++ * Used by MarkSweep::mark_sweep_phase4() */
++
++ HeapWord* q = bottom();
++ HeapWord* const t = _end_of_live;
++ debug_only(HeapWord* prev_q = NULL);
++
++ if (q < t && _first_dead > q &&
++ !oop(q)->is_gc_marked()) {
++ debug_only(
++ /* we have a chunk of the space which hasn't moved and we've reinitialized
++ * the mark word during the previous pass, so we can't use is_gc_marked for
++ * the traversal. */
++ HeapWord* const end = _first_dead;
++
++ while (q < end) {
++ size_t size = obj_size(q); // FIXME: idubrov oop(q)->size();
++ assert(!oop(q)->is_gc_marked(),
++ "should be unmarked (special dense prefix handling)");
++ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::live_oop_moved_to(q, size, q));
++ debug_only(prev_q = q);
++ q += size;
++ }
++ ) /* debug_only */
++ // (tw) first_dead can be live object!
++ q = _first_dead;
++
++ //if (_first_dead == t) {
++ // q = t;
++ //} else {
++ ///* $$$ Funky */
++ //q = (HeapWord*) oop(_first_dead)->mark()->decode_pointer();
++ //}
++ }
++
++ const intx scan_interval = PrefetchScanIntervalInBytes;
++ const intx copy_interval = PrefetchCopyIntervalInBytes;
++ while (q < t) {
++ if (!oop(q)->is_gc_marked()) {
++ /* mark is pointer to next marked oop */
++ debug_only(prev_q = q);
++ q = (HeapWord*) oop(q)->mark()->decode_pointer();
++ assert(q > prev_q, "we should be moving forward through memory");
++ } else {
++ /* prefetch beyond q */
++ Prefetch::read(q, scan_interval);
++
++ /* size and destination */
++ size_t size = obj_size(q);
++ HeapWord* compaction_top = (HeapWord*)oop(q)->forwardee();
++
++ if (must_rescue(oop(q), oop(q)->forwardee())) {
++ oop dest_obj = rescue(oop(q));
++ debug_only(Copy::fill_to_words(q, size, 0));
++ } else {
++
++ /* prefetch beyond compaction_top */
++ Prefetch::write(compaction_top, copy_interval);
++
++ /* copy object and reinit its mark */
++ VALIDATE_MARK_SWEEP_ONLY(MarkSweep::live_oop_moved_to(q, size,
++ compaction_top));
++ assert(q != compaction_top || oop(q)->blueprint()->new_version() != NULL, "everything in this pass should be moving");
++
++ if (oop(q)->blueprint()->new_version() != NULL) {
++ MarkSweep::update_fields(oop(q), oop(compaction_top));
++ } else {
++ Copy::aligned_conjoint_words(q, compaction_top, size);
++ }
++ oop(compaction_top)->init_mark();
++ assert(oop(compaction_top)->klass() != NULL, "should have a class");
++ }
++
++ debug_only(prev_q = q);
++ q += size;
++ }
++ }
++
++ /* Let's remember if we were empty before we did the compaction. */
++ bool was_empty = used_region().is_empty();
++ /* Reset space after compaction is complete */
++ reset_after_compaction();
++ /* We do this clear, below, since it has overloaded meanings for some */
++ /* space subtypes. For example, OffsetTableContigSpace's that were */
++ /* compacted into will have had their offset table thresholds updated */
++ /* continuously, but those that weren't need to have their thresholds */
++ /* re-initialized. Also mangles unused area for debugging. */
++ if (used_region().is_empty()) {
++ if (!was_empty) clear(SpaceDecorator::Mangle);
++ } else {
++ if (ZapUnusedHeapArea) mangle_unused_area();
++ }
++
++ //SCAN_AND_COMPACT(obj_size);
+ }
+
+ void Space::print_short() const { print_short_on(tty); }
+diff -r 882f6c762ac5 src/share/vm/memory/space.hpp
+--- a/src/share/vm/memory/space.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/memory/space.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -445,6 +445,9 @@
+ // indicates when the next such action should be taken.
+ virtual void prepare_for_compaction(CompactPoint* cp);
+ // MarkSweep support phase3
++ DEBUG_ONLY(int space_index(oop obj));
++ bool must_rescue(oop old_obj, oop new_obj);
++ oop rescue(oop old_obj);
+ virtual void adjust_pointers();
+ // MarkSweep support phase4
+ virtual void compact();
+@@ -475,6 +478,10 @@
+ virtual HeapWord* forward(oop q, size_t size, CompactPoint* cp,
+ HeapWord* compact_top);
+
++ // (tw)
++ virtual HeapWord* forward_compact_top(size_t size, CompactPoint* cp,
++ HeapWord* compact_top);
++
+ // Return a size with adjusments as required of the space.
+ virtual size_t adjust_object_size_v(size_t size) const { return size; }
+
+diff -r 882f6c762ac5 src/share/vm/memory/universe.cpp
+--- a/src/share/vm/memory/universe.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/memory/universe.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -100,6 +100,8 @@
+ #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
+ #endif
+
++bool Universe::_is_redefining_gc_run = false;
++
+ // Known objects
+ klassOop Universe::_boolArrayKlassObj = NULL;
+ klassOop Universe::_byteArrayKlassObj = NULL;
+@@ -204,6 +206,38 @@
+ f(systemObjArrayKlassObj());
+ }
+
++// DCEVM: This method should iterate all pointers that are not within heap objects.
++void Universe::root_oops_do(OopClosure *oopClosure) {
++
++ class AlwaysTrueClosure: public BoolObjectClosure {
++ public:
++ void do_object(oop p) { ShouldNotReachHere(); }
++ bool do_object_b(oop p) { return true; }
++ };
++ AlwaysTrueClosure always_true;
++
++ // General strong roots
++ Universe::oops_do(oopClosure);
++ JNIHandles::oops_do(oopClosure);
++ Threads::oops_do(oopClosure, NULL);
++ ObjectSynchronizer::oops_do(oopClosure);
++ FlatProfiler::oops_do(oopClosure);
++ //Management::oops_do(oopClosure); // DCEVM: TODO: Check if this is correct?
++ JvmtiExport::oops_do(oopClosure);
++ // SO_AllClasses
++ SystemDictionary::oops_do(oopClosure);
++
++ // Now adjust pointers in remaining weak roots. (All of which should
++ // have been cleared if they pointed to non-surviving objects.)
++ // Global (weak) JNI handles
++ JNIHandles::weak_oops_do(&always_true, oopClosure);
++
++ CodeCache::oops_do(oopClosure);
++ StringTable::oops_do(oopClosure);
++ //ref_processor()->weak_oops_do(&oopClosure); // DCEVM: TODO: Check if this is correct?
++ //PSScavenge::reference_processor()->weak_oops_do(&oopClosure); // DCEVM: TODO: Check if this is correct?
++}
++
+ void Universe::oops_do(OopClosure* f, bool do_all) {
+
+ f->do_oop((oop*) &_int_mirror);
+diff -r 882f6c762ac5 src/share/vm/memory/universe.hpp
+--- a/src/share/vm/memory/universe.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/memory/universe.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -127,6 +127,8 @@
+ friend class SystemDictionary;
+ friend class VMStructs;
+ friend class CompactingPermGenGen;
++ friend class Space;
++ friend class ContiguousSpace;
+ friend class VM_PopulateDumpSharedSpace;
+
+ friend jint universe_init();
+@@ -258,7 +260,18 @@
+
+ static void compute_verify_oop_data();
+
++ static bool _is_redefining_gc_run;
++
+ public:
++
++ static bool is_redefining_gc_run() {
++ return _is_redefining_gc_run;
++ }
++
++ static void set_redefining_gc_run(bool b) {
++ _is_redefining_gc_run = b;
++ }
++
+ // Known classes in the VM
+ static klassOop boolArrayKlassObj() { return _boolArrayKlassObj; }
+ static klassOop byteArrayKlassObj() { return _byteArrayKlassObj; }
+@@ -403,6 +416,8 @@
+
+ // Iteration
+
++ static void root_oops_do(OopClosure *f);
++
+ // Apply "f" to the addresses of all the direct heap pointers maintained
+ // as static fields of "Universe".
+ static void oops_do(OopClosure* f, bool do_all = false);
+@@ -419,6 +434,7 @@
+
+ // Debugging
+ static bool verify_in_progress() { return _verify_in_progress; }
++ static void set_verify_in_progress(bool b) { _verify_in_progress = b; }
+ static void verify(VerifyOption option, const char* prefix, bool silent = VerifySilently);
+ static void verify(const char* prefix, bool silent = VerifySilently) {
+ verify(VerifyOption_Default, prefix, silent);
+diff -r 882f6c762ac5 src/share/vm/oops/arrayKlass.cpp
+--- a/src/share/vm/oops/arrayKlass.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/arrayKlass.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -136,9 +136,9 @@
+
+ bool arrayKlass::compute_is_subtype_of(klassOop k) {
+ // An array is a subtype of Serializable, Clonable, and Object
+- return k == SystemDictionary::Object_klass()
+- || k == SystemDictionary::Cloneable_klass()
+- || k == SystemDictionary::Serializable_klass();
++ return k->klass_part()->newest_version() == SystemDictionary::Object_klass()->klass_part()->newest_version()
++ || k->klass_part()->newest_version() == SystemDictionary::Cloneable_klass()->klass_part()->newest_version()
++ || k->klass_part()->newest_version() == SystemDictionary::Serializable_klass()->klass_part()->newest_version();
+ }
+
+
+diff -r 882f6c762ac5 src/share/vm/oops/constMethodKlass.cpp
+--- a/src/share/vm/oops/constMethodKlass.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/constMethodKlass.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -102,6 +102,7 @@
+ constMethodOop cm = constMethodOop(obj);
+ MarkSweep::mark_and_push(cm->adr_constants());
+ MarkSweep::mark_and_push(cm->adr_stackmap_data());
++ MarkSweep::mark_and_push(cm->adr_code_section_table());
+ // Performance tweak: We skip iterating over the klass pointer since we
+ // know that Universe::constMethodKlassObj never moves.
+ }
+@@ -113,6 +114,7 @@
+ constMethodOop cm_oop = constMethodOop(obj);
+ PSParallelCompact::mark_and_push(cm, cm_oop->adr_constants());
+ PSParallelCompact::mark_and_push(cm, cm_oop->adr_stackmap_data());
++ PSParallelCompact::mark_and_push(cm, cm_oop->adr_code_section_table());
+ // Performance tweak: We skip iterating over the klass pointer since we
+ // know that Universe::constMethodKlassObj never moves.
+ }
+@@ -123,6 +125,7 @@
+ constMethodOop cm = constMethodOop(obj);
+ blk->do_oop(cm->adr_constants());
+ blk->do_oop(cm->adr_stackmap_data());
++ blk->do_oop(cm->adr_code_section_table());
+ // Get size before changing pointers.
+ // Don't call size() or oop_size() since that is a virtual call.
+ int size = cm->object_size();
+@@ -138,6 +141,8 @@
+ if (mr.contains(adr)) blk->do_oop(adr);
+ adr = cm->adr_stackmap_data();
+ if (mr.contains(adr)) blk->do_oop(adr);
++ adr = cm->adr_code_section_table();
++ if (mr.contains(adr)) blk->do_oop(adr);
+ // Get size before changing pointers.
+ // Don't call size() or oop_size() since that is a virtual call.
+ int size = cm->object_size();
+@@ -152,6 +157,7 @@
+ constMethodOop cm = constMethodOop(obj);
+ MarkSweep::adjust_pointer(cm->adr_constants());
+ MarkSweep::adjust_pointer(cm->adr_stackmap_data());
++ MarkSweep::adjust_pointer(cm->adr_code_section_table());
+ // Get size before changing pointers.
+ // Don't call size() or oop_size() since that is a virtual call.
+ int size = cm->object_size();
+diff -r 882f6c762ac5 src/share/vm/oops/constMethodOop.hpp
+--- a/src/share/vm/oops/constMethodOop.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/constMethodOop.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -129,7 +129,7 @@
+
+ public:
+ oop* oop_block_beg() const { return adr_constants(); }
+- oop* oop_block_end() const { return adr_stackmap_data() + 1; }
++ oop* oop_block_end() const { return adr_code_section_table() + 1; }
+
+ private:
+ //
+@@ -141,6 +141,9 @@
+ // Raw stackmap data for the method
+ typeArrayOop _stackmap_data;
+
++ // (tw) Table mapping code sections for method forward points.
++ typeArrayOop _code_section_table;
++
+ //
+ // End of the oop block.
+ //
+@@ -195,6 +198,28 @@
+ }
+ bool has_stackmap_table() const { return _stackmap_data != NULL; }
+
++ // code section table
++ typeArrayOop code_section_table() const { return _code_section_table; }
++ void set_code_section_table(typeArrayOop e) { oop_store_without_check((oop*) &_code_section_table, (oop) e); }
++ bool has_code_section_table() const { return code_section_table() != NULL && code_section_table()->length() > 0; }
++ static const int ValuesPerCodeSectionEntry = 3;
++ int code_section_entries() const {
++ if (!has_code_section_table()) return 0;
++ return _code_section_table->length() / ValuesPerCodeSectionEntry;
++ }
++
++ int code_section_new_index_at(int index) const {
++ return _code_section_table->short_at(index * ValuesPerCodeSectionEntry);
++ }
++
++ int code_section_original_index_at(int index) const {
++ return _code_section_table->short_at(index * ValuesPerCodeSectionEntry + 1);
++ }
++
++ int code_section_length_at(int index) const {
++ return _code_section_table->short_at(index * ValuesPerCodeSectionEntry + 2);
++ }
++
+ void init_fingerprint() {
+ const uint64_t initval = CONST64(0x8000000000000000);
+ _fingerprint = initval;
+@@ -301,6 +326,7 @@
+ // Garbage collection support
+ oop* adr_constants() const { return (oop*)&_constants; }
+ oop* adr_stackmap_data() const { return (oop*)&_stackmap_data; }
++ oop* adr_code_section_table() const { return (oop*)&_code_section_table; }
+ bool is_conc_safe() { return _is_conc_safe; }
+ void set_is_conc_safe(bool v) { _is_conc_safe = v; }
+
+diff -r 882f6c762ac5 src/share/vm/oops/cpCacheOop.cpp
+--- a/src/share/vm/oops/cpCacheOop.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/cpCacheOop.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -37,9 +37,15 @@
+
+ // Implememtation of ConstantPoolCacheEntry
+
++void ConstantPoolCacheEntry::copy_from(ConstantPoolCacheEntry *other) {
++ _flags = other->_flags; // flags
++}
++
+ void ConstantPoolCacheEntry::initialize_entry(int index) {
+ assert(0 < index && index < 0x10000, "sanity check");
+ _indices = index;
++ _f1 = NULL;
++ _f2 = 0;
+ assert(constant_pool_index() == index, "");
+ }
+
+@@ -162,7 +168,8 @@
+ int vtable_index) {
+ assert(!is_secondary_entry(), "");
+ assert(method->interpreter_entry() != NULL, "should have been set at this point");
+- assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache");
++ // (tw) No longer valid assert
++ //assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache");
+
+ int byte_no = -1;
+ bool change_to_virtual = false;
+@@ -183,6 +190,7 @@
+ set_method_flags(as_TosState(method->result_type()),
+ ( 1 << is_vfinal_shift) |
+ ((method->is_final_method() ? 1 : 0) << is_final_shift) |
++ ((method->is_old() ? 1 : 0) << is_old_method_shift) |
+ ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift),
+ method()->size_of_parameters());
+ set_f2_as_vfinal_method(method());
+@@ -190,9 +198,13 @@
+ assert(vtable_index >= 0, "valid index");
+ assert(!method->is_final_method(), "sanity");
+ set_method_flags(as_TosState(method->result_type()),
++ ((method->is_old() ? 1 : 0) << is_old_method_shift) |
+ ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift),
+ method()->size_of_parameters());
+ set_f2(vtable_index);
++
++ // (tw) save method holder in f1 for virtual calls
++ set_f1(method());
+ }
+ byte_no = 2;
+ break;
+@@ -206,7 +218,8 @@
+ // Once is_vfinal is set, it must stay that way, lest we get a dangling oop.
+ set_method_flags(as_TosState(method->result_type()),
+ ((is_vfinal() ? 1 : 0) << is_vfinal_shift) |
+- ((method->is_final_method() ? 1 : 0) << is_final_shift),
++ ((method->is_final_method() ? 1 : 0) << is_final_shift) |
++ ((method->is_old() ? 1 : 0) << is_old_method_shift),
+ method()->size_of_parameters());
+ set_f1(method());
+ byte_no = 1;
+@@ -259,7 +272,7 @@
+ set_f1(interf);
+ set_f2(index);
+ set_method_flags(as_TosState(method->result_type()),
+- 0, // no option bits
++ ((method->is_old() ? 1 : 0) << is_old_method_shift),
+ method()->size_of_parameters());
+ set_bytecode_1(Bytecodes::_invokeinterface);
+ }
+@@ -520,27 +533,12 @@
+ // If this constantPoolCacheEntry refers to old_method then update it
+ // to refer to new_method.
+ bool ConstantPoolCacheEntry::adjust_method_entry(methodOop old_method,
+- methodOop new_method, bool * trace_name_printed) {
++ methodOop new_method) {
+
+ if (is_vfinal()) {
+- // virtual and final so _f2 contains method ptr instead of vtable index
+- if (f2_as_vfinal_method() == old_method) {
+- // match old_method so need an update
+- // NOTE: can't use set_f2_as_vfinal_method as it asserts on different values
+- _f2 = (intptr_t)new_method;
+- if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
+- if (!(*trace_name_printed)) {
+- // RC_TRACE_MESG macro has an embedded ResourceMark
+- RC_TRACE_MESG(("adjust: name=%s",
+- Klass::cast(old_method->method_holder())->external_name()));
+- *trace_name_printed = true;
+- }
+- // RC_TRACE macro has an embedded ResourceMark
+- RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)",
+- new_method->name()->as_C_string(),
+- new_method->signature()->as_C_string()));
+- }
+-
++ // virtual and final so f2() contains method ptr instead of vtable index
++ if (f2_as_vfinal_method() != NULL && f2_as_vfinal_method()->method_holder()->klass_part()->new_version()) {
++ initialize_entry(constant_pool_index());
+ return true;
+ }
+
+@@ -548,84 +546,27 @@
+ return false;
+ }
+
+- if ((oop)_f1 == NULL) {
+- // NULL f1() means this is a virtual entry so bail out
+- // We are assuming that the vtable index does not need change.
++ // (tw) check how to update interface methods!
++ if (bytecode_1() == Bytecodes::_invokevirtual || bytecode_2() == Bytecodes::_invokevirtual) {
++
++ if(f1_as_method()->method_holder()->klass_part()->new_version()) {
++ initialize_entry(constant_pool_index());
++ return true;
++ }
++
+ return false;
+ }
+
+ if ((oop)_f1 == old_method) {
+ _f1 = new_method;
+- if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
+- if (!(*trace_name_printed)) {
+- // RC_TRACE_MESG macro has an embedded ResourceMark
+- RC_TRACE_MESG(("adjust: name=%s",
+- Klass::cast(old_method->method_holder())->external_name()));
+- *trace_name_printed = true;
+- }
+- // RC_TRACE macro has an embedded ResourceMark
+- RC_TRACE(0x00400000, ("cpc entry update: %s(%s)",
+- new_method->name()->as_C_string(),
+- new_method->signature()->as_C_string()));
+- }
+-
+ return true;
++ } else if(_f1 != NULL && (bytecode_1() != Bytecodes::_invokeinterface && f1_as_method()->method_holder()->klass_part()->new_version())) {
++ initialize_entry(constant_pool_index());
+ }
+
+ return false;
+ }
+
+-// a constant pool cache entry should never contain old or obsolete methods
+-bool ConstantPoolCacheEntry::check_no_old_or_obsolete_entries() {
+- if (is_vfinal()) {
+- // virtual and final so _f2 contains method ptr instead of vtable index
+- methodOop m = (methodOop)_f2;
+- // Return false if _f2 refers to an old or an obsolete method.
+- // _f2 == NULL || !m->is_method() are just as unexpected here.
+- return (m != NULL && m->is_method() && !m->is_old() && !m->is_obsolete());
+- } else if ((oop)_f1 == NULL || !((oop)_f1)->is_method()) {
+- // _f1 == NULL || !_f1->is_method() are OK here
+- return true;
+- }
+-
+- methodOop m = (methodOop)_f1;
+- // return false if _f1 refers to an old or an obsolete method
+- return (!m->is_old() && !m->is_obsolete());
+-}
+-
+-bool ConstantPoolCacheEntry::is_interesting_method_entry(klassOop k) {
+- if (!is_method_entry()) {
+- // not a method entry so not interesting by default
+- return false;
+- }
+-
+- methodOop m = NULL;
+- if (is_vfinal()) {
+- // virtual and final so _f2 contains method ptr instead of vtable index
+- m = f2_as_vfinal_method();
+- } else if (is_f1_null()) {
+- // NULL _f1 means this is a virtual entry so also not interesting
+- return false;
+- } else {
+- oop f1 = _f1; // _f1 is volatile
+- if (!f1->is_method()) {
+- // _f1 can also contain a klassOop for an interface
+- return false;
+- }
+- m = f1_as_method();
+- }
+-
+- assert(m != NULL && m->is_method(), "sanity check");
+- if (m == NULL || !m->is_method() || (k != NULL && m->method_holder() != k)) {
+- // robustness for above sanity checks or method is not in
+- // the interesting class
+- return false;
+- }
+-
+- // the method is in the interesting class so the entry is interesting
+- return true;
+-}
+-
+ void ConstantPoolCacheEntry::print(outputStream* st, int index) const {
+ // print separator
+ if (index == 0) st->print_cr(" -------------");
+@@ -663,60 +604,18 @@
+ }
+ }
+
+-// RedefineClasses() API support:
+-// If any entry of this constantPoolCache points to any of
+-// old_methods, replace it with the corresponding new_method.
+-void constantPoolCacheOopDesc::adjust_method_entries(methodOop* old_methods, methodOop* new_methods,
+- int methods_length, bool * trace_name_printed) {
+-
+- if (methods_length == 0) {
+- // nothing to do if there are no methods
+- return;
+- }
+-
+- // get shorthand for the interesting class
+- klassOop old_holder = old_methods[0]->method_holder();
++void constantPoolCacheOopDesc::adjust_entries(methodOop* old_methods, methodOop* new_methods,
++ int methods_length) {
+
+ for (int i = 0; i < length(); i++) {
+- if (!entry_at(i)->is_interesting_method_entry(old_holder)) {
+- // skip uninteresting methods
+- continue;
+- }
+-
+- // The constantPoolCache contains entries for several different
+- // things, but we only care about methods. In fact, we only care
+- // about methods in the same class as the one that contains the
+- // old_methods. At this point, we have an interesting entry.
+-
+- for (int j = 0; j < methods_length; j++) {
+- methodOop old_method = old_methods[j];
+- methodOop new_method = new_methods[j];
+-
+- if (entry_at(i)->adjust_method_entry(old_method, new_method,
+- trace_name_printed)) {
+- // current old_method matched this entry and we updated it so
+- // break out and get to the next interesting entry if there one
+- break;
+- }
++ if (entry_at(i)->is_field_entry()) {
++ // (tw) TODO: Update only field offsets and modify only constant pool entries that
++ // point to changed fields
++ entry_at(i)->initialize_entry(entry_at(i)->constant_pool_index());
++ } else if(entry_at(i)->is_method_entry() && !entry_at(i)->is_secondary_entry()) {
++ entry_at(i)->adjust_method_entry(NULL, NULL);
+ }
+ }
+ }
+
+-// the constant pool cache should never contain old or obsolete methods
+-bool constantPoolCacheOopDesc::check_no_old_or_obsolete_entries() {
+- for (int i = 1; i < length(); i++) {
+- if (entry_at(i)->is_interesting_method_entry(NULL) &&
+- !entry_at(i)->check_no_old_or_obsolete_entries()) {
+- return false;
+- }
+- }
+- return true;
+-}
+
+-void constantPoolCacheOopDesc::dump_cache() {
+- for (int i = 1; i < length(); i++) {
+- if (entry_at(i)->is_interesting_method_entry(NULL)) {
+- entry_at(i)->print(tty, i);
+- }
+- }
+-}
+diff -r 882f6c762ac5 src/share/vm/oops/cpCacheOop.hpp
+--- a/src/share/vm/oops/cpCacheOop.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/cpCacheOop.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -136,7 +136,8 @@
+ void set_bytecode_2(Bytecodes::Code code);
+ void set_f1(oop f1) {
+ oop existing_f1 = _f1; // read once
+- assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change");
++ // (tw) need to relax assertion for redefinition
++ // assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change");
+ oop_store(&_f1, f1);
+ }
+ void release_set_f1(oop f1);
+@@ -174,6 +175,7 @@
+ tos_state_mask = right_n_bits(tos_state_bits),
+ tos_state_shift = BitsPerInt - tos_state_bits, // see verify_tos_state_shift below
+ // misc. option bits; can be any bit position in [16..27]
++ is_old_method_shift = 19,
+ is_vfinal_shift = 20,
+ is_volatile_shift = 21,
+ is_final_shift = 22,
+@@ -207,6 +209,8 @@
+ void initialize_entry(int original_index); // initialize primary entry
+ void initialize_secondary_entry(int main_index); // initialize secondary entry
+
++ void copy_from(ConstantPoolCacheEntry *other);
++
+ void set_field( // sets entry to resolved field state
+ Bytecodes::Code get_code, // the bytecode used for reading the field
+ Bytecodes::Code put_code, // the bytecode used for writing the field
+@@ -368,10 +372,7 @@
+ // trace_name_printed is set to true if the current call has
+ // printed the klass name so that other routines in the adjust_*
+ // group don't print the klass name.
+- bool adjust_method_entry(methodOop old_method, methodOop new_method,
+- bool * trace_name_printed);
+- bool check_no_old_or_obsolete_entries();
+- bool is_interesting_method_entry(klassOop k);
++ bool adjust_method_entry(methodOop old_method, methodOop new_method);
+
+ // Debugging & Printing
+ void print (outputStream* st, int index) const;
+@@ -492,16 +493,9 @@
+ return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index);
+ }
+
+- // RedefineClasses() API support:
+- // If any entry of this constantPoolCache points to any of
+- // old_methods, replace it with the corresponding new_method.
+- // trace_name_printed is set to true if the current call has
+- // printed the klass name so that other routines in the adjust_*
+- // group don't print the klass name.
+- void adjust_method_entries(methodOop* old_methods, methodOop* new_methods,
+- int methods_length, bool * trace_name_printed);
+- bool check_no_old_or_obsolete_entries();
+- void dump_cache();
++ // (tw) Update method and field references
++ void adjust_entries(methodOop* old_methods, methodOop* new_methods,
++ int methods_length);
+ };
+
+ #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP
+diff -r 882f6c762ac5 src/share/vm/oops/instanceKlass.cpp
+--- a/src/share/vm/oops/instanceKlass.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/instanceKlass.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -250,12 +250,118 @@
+ }
+
+
++void instanceKlass::initialize_redefined_class() {
++ RC_TRACE(0x00000400, ("initializing redefined class %s",
++ name()->as_C_string()));
++
++ assert(!is_initialized(), "");
++ assert(this->old_version() != NULL, "");
++ assert(is_linked(), "must be linked before");
++
++
++ instanceKlassHandle this_oop(Thread::current(), this->as_klassOop());
++ class UpdateStaticFieldClosure : public FieldClosure {
++
++ private:
++ instanceKlassHandle this_oop;
++
++ public:
++ UpdateStaticFieldClosure(instanceKlassHandle this_oop) {
++ this->this_oop = this_oop;
++ }
++
++ virtual void do_field(fieldDescriptor* fd) {
++ fieldDescriptor result;
++ bool found = ((instanceKlass *)(this_oop->old_version()->klass_part()))->find_local_field(fd->name(), fd->signature(), &result);
++
++ if (found && result.is_static()) {
++ int old_offset = result.offset();
++ assert(result.field_type() == fd->field_type(), "Old and new field type does not match");
++
++ oop new_location = this_oop()->java_mirror();
++ oop old_location = this_oop->old_version()->java_mirror();
++ int offset = fd->offset();
++ RC_TRACE(0x00000400, ("Copying static field value for field '%s' old_offset=%d new_offset=%d",
++ fd->name()->as_C_string(), old_offset, offset));
++
++ oop cur_oop;
++
++ switch(result.field_type()) {
++
++ // Found static field with same name and type in the old klass => copy value from old to new klass
++
++ case T_BOOLEAN:
++ new_location->bool_field_put(offset, old_location->bool_field(old_offset));
++ DEBUG_ONLY(old_location->byte_field_put(old_offset, 0));
++ break;
++
++ case T_CHAR:
++ new_location->char_field_put(offset, old_location->char_field(old_offset));
++ DEBUG_ONLY(old_location->char_field_put(old_offset, 0));
++ break;
++
++ case T_FLOAT:
++ new_location->float_field_put(offset, old_location->float_field(old_offset));
++ DEBUG_ONLY(old_location->float_field_put(old_offset, 0));
++ break;
++
++ case T_DOUBLE:
++ new_location->double_field_put(offset, old_location->double_field(old_offset));
++ DEBUG_ONLY(old_location->double_field_put(old_offset, 0));
++ break;
++
++ case T_BYTE:
++ new_location->byte_field_put(offset, old_location->byte_field(old_offset));
++ DEBUG_ONLY(old_location->byte_field_put(old_offset, 0));
++ break;
++
++ case T_SHORT:
++ new_location->short_field_put(offset, old_location->short_field(old_offset));
++ DEBUG_ONLY(old_location->short_field_put(old_offset, 0));
++ break;
++
++ case T_INT:
++ new_location->int_field_put(offset, old_location->int_field(old_offset));
++ DEBUG_ONLY(old_location->int_field_put(old_offset, 0));
++ break;
++
++ case T_LONG:
++ new_location->long_field_put(offset, old_location->long_field(old_offset));
++ DEBUG_ONLY(old_location->long_field_put(old_offset, 0));
++ break;
++
++ case T_OBJECT:
++ case T_ARRAY:
++ cur_oop = old_location->obj_field(old_offset);
++ new_location->obj_field_put_raw(offset, cur_oop);
++ old_location->obj_field_put_raw(old_offset, NULL);
++ break;
++
++ default:
++ ShouldNotReachHere();
++ }
++ } else {
++ RC_TRACE(0x00000200, ("New static field %s has_initial_value=%d",
++ fd->name()->as_C_string(), (int)(fd->has_initial_value())));
++ // field not found
++ // (tw) TODO: Probably this call is not necessary here!
++ // FIXME: idubrov
++ //ClassFileParser::initialize_static_field(fd, Thread::current());
++ }
++ }
++ };
++
++ UpdateStaticFieldClosure cl(this_oop);
++ this->do_local_static_fields(&cl);
++}
++
++
+ bool instanceKlass::verify_code(
+ instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS) {
+ // 1) Verify the bytecodes
+ Verifier::Mode mode =
+ throw_verifyerror ? Verifier::ThrowException : Verifier::NoException;
+- return Verifier::verify(this_oop, mode, this_oop->should_verify_class(), CHECK_false);
++ return Verifier::verify(this_oop, mode, this_oop->should_verify_class(), true, CHECK_false);
+ }
+
+
+@@ -362,7 +468,13 @@
+ jt->get_thread_stat()->perf_recursion_counts_addr(),
+ jt->get_thread_stat()->perf_timers_addr(),
+ PerfClassTraceTime::CLASS_VERIFY);
+- bool verify_ok = verify_code(this_oop, throw_verifyerror, THREAD);
++ if (this_oop->is_redefining()) {
++ Thread::current()->set_pretend_new_universe(true);
++ }
++ bool verify_ok = verify_code(this_oop, throw_verifyerror, THREAD);
++ if (this_oop->is_redefining()) {
++ Thread::current()->set_pretend_new_universe(false);
++ }
+ if (!verify_ok) {
+ return false;
+ }
+@@ -400,7 +512,8 @@
+ }
+ #endif
+ this_oop->set_init_state(linked);
+- if (JvmtiExport::should_post_class_prepare()) {
++ // (tw) Must check for old version in order to prevent infinite loops.
++ if (JvmtiExport::should_post_class_prepare() && this_oop->old_version() == NULL /* JVMTI deadlock otherwise */) {
+ Thread *thread = THREAD;
+ assert(thread->is_Java_thread(), "thread->is_Java_thread()");
+ JvmtiExport::post_class_prepare((JavaThread *) thread, this_oop());
+@@ -673,6 +786,18 @@
+ return false;
+ }
+
++bool instanceKlass::implements_interface_any_version(klassOop k) const {
++ k = k->klass_part()->newest_version();
++ if (this->newest_version() == k) return true;
++ assert(Klass::cast(k)->is_interface(), "should be an interface class");
++ for (int i = 0; i < transitive_interfaces()->length(); i++) {
++ if (((klassOop)transitive_interfaces()->obj_at(i))->klass_part()->newest_version() == k) {
++ return true;
++ }
++ }
++ return false;
++}
++
+ objArrayOop instanceKlass::allocate_objArray(int n, int length, TRAPS) {
+ if (length < 0) THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
+ if (length > arrayOopDesc::max_array_length(T_OBJECT)) {
+@@ -801,7 +926,25 @@
+ }
+
+ void instanceKlass::call_class_initializer_impl(instanceKlassHandle this_oop, TRAPS) {
++
++ ResourceMark rm(THREAD);
+ methodHandle h_method(THREAD, this_oop->class_initializer());
++
++ if (this_oop->revision_number() != -1){
++ methodOop m = NULL;
++ if (AllowAdvancedClassRedefinition) {
++ m = this_oop->find_method(vmSymbols::static_transformer_name(), vmSymbols::void_method_signature());
++ }
++ methodHandle method(m);
++ if (method() != NULL && method()->is_static()) {
++ RC_TRACE(0x00000200, ("Calling static transformer instead of static initializer"));
++ h_method = method;
++ } else if (!((instanceKlass*)this_oop->old_version()->klass_part())->is_not_initialized()) {
++ // Only execute the static initializer, if it was not yet executed for the old version of the class.
++ return;
++ }
++ }
++
+ assert(!this_oop->is_initialized(), "we cannot initialize twice");
+ if (TraceClassInitialization) {
+ tty->print("%d Initializing ", call_class_initializer_impl_counter++);
+@@ -949,6 +1092,137 @@
+ }
+ }
+
++void instanceKlass::store_update_information(GrowableArray<int> &values) {
++ int *arr = NEW_C_HEAP_ARRAY(int, values.length(), mtClass);
++ for (int i=0; i<values.length(); i++) {
++ arr[i] = values.at(i);
++ }
++ set_update_information(arr);
++}
++
++void instanceKlass::clear_update_information() {
++ FREE_C_HEAP_ARRAY(int, update_information(), mtClass);
++ set_update_information(NULL);
++}
++
++typedef Pair<int, klassOop> typeInfoPair;
++
++void instanceKlass::store_type_check_information(GrowableArray< Pair<int, klassOop> > &values) {
++ Pair<int, klassOop> *arr = NEW_C_HEAP_ARRAY(typeInfoPair, values.length(), mtClass);
++ for (int i=0; i<values.length(); i++) {
++ arr[i] = values.at(i);
++ }
++ set_type_check_information(arr);
++}
++
++void instanceKlass::clear_type_check_information() {
++ FREE_C_HEAP_ARRAY(typeInfoPair, type_check_information(), mtClass);
++ set_type_check_information(NULL);
++}
++
++void instanceKlass::do_fields_evolution(FieldEvolutionClosure* cl) {
++
++ assert (old_version() != NULL, "must have old version!");
++
++ klassOop old_klass_oop = old_version();
++ instanceKlass *old_klass = instanceKlass::cast(old_klass_oop);
++ instanceKlass *new_klass = this;
++
++ fieldDescriptor fd;
++ fieldDescriptor old_fd;
++
++ instanceKlass *cur_new_klass = new_klass;
++ klassOop cur_new_klass_oop = this->as_klassOop();
++
++ if (_fields_not_changed) {
++
++ class MyFieldClosure : public FieldClosure {
++
++ FieldEvolutionClosure *_cl;
++ public:
++ MyFieldClosure(FieldEvolutionClosure *cl) {_cl = cl; }
++ virtual void do_field(fieldDescriptor* fd) {
++ _cl->do_changed_field(fd, fd);
++ }
++ };
++
++ MyFieldClosure mfc(cl);
++ do_nonstatic_fields(&mfc);
++ } else {
++
++ _fields_not_changed = true;
++ GrowableArray<fieldDescriptor> fds;
++ while (true) {
++ for (JavaFieldStream fs(cur_new_klass); !fs.done(); fs.next()) {
++ fd.initialize(cur_new_klass_oop, fs.index());
++ if (fd.is_static()) {
++ continue;
++ }
++ fds.append(fd);
++ }
++
++ if (cur_new_klass->super() != NULL) {
++ cur_new_klass_oop = cur_new_klass->super();
++ cur_new_klass = instanceKlass::cast(cur_new_klass_oop);
++ } else {
++ break;
++ }
++ }
++
++ GrowableArray<fieldDescriptor> sortedFds;
++ while (fds.length() > 0) {
++ int minOffset = 0x7fffffff;
++ int minIndex = -1;
++ for (int i=0; i<fds.length(); i++) {
++ int curOffset = fds.adr_at(i)->offset();
++ if (curOffset < minOffset) {
++ minOffset = curOffset;
++ minIndex = i;
++ }
++ }
++
++ sortedFds.append(fds.at(minIndex));
++ fds.remove_at(minIndex);
++ }
++
++
++ for (int i=0; i<sortedFds.length(); i++) {
++ fieldDescriptor &fd = *sortedFds.adr_at(i);
++
++ char found = 0;
++ instanceKlass *cur_old_klass = old_klass;
++ klassOop cur_old_klass_oop = old_klass_oop;
++ while (true) {
++ for (JavaFieldStream fs(cur_old_klass); !fs.done(); fs.next()) {
++ old_fd.initialize(cur_old_klass_oop, fs.index());
++ if (old_fd.is_static()) {
++ continue;
++ }
++ if (old_fd.name() == fd.name() && old_fd.signature() == fd.signature()) {
++ found = 1;
++ break;
++ }
++ }
++ if (!found && cur_old_klass->super()) {
++ cur_old_klass_oop = cur_old_klass->super();
++ cur_old_klass = instanceKlass::cast(cur_old_klass_oop);
++ } else {
++ break;
++ }
++ }
++
++ if (found) {
++ if (old_fd.offset() != fd.offset()) {
++ _fields_not_changed = false;
++ }
++ cl->do_changed_field(&old_fd, &fd);
++ } else {
++ _fields_not_changed = false;
++ cl->do_new_field(&fd);
++ }
++ }
++ }
++}
+
+ void instanceKlass::do_local_static_fields(FieldClosure* cl) {
+ for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
+@@ -1368,6 +1642,20 @@
+ return id;
+ }
+
++bool instanceKlass::update_jmethod_id(methodOop method, jmethodID newMethodID) {
++ size_t idnum = (size_t)method->method_idnum();
++ jmethodID* jmeths = methods_jmethod_ids_acquire();
++ size_t length; // length assigned as debugging crumb
++ jmethodID id = NULL;
++ if (jmeths != NULL && // If there is a cache
++ (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough,
++ jmeths[idnum+1] = newMethodID; // Set the id (may be NULL)
++ return true;
++ }
++
++ return false;
++}
++
+
+ // Cache an itable index
+ void instanceKlass::set_cached_itable_index(size_t idnum, int index) {
+@@ -1527,6 +1815,13 @@
+ last = b;
+ b = b->next();
+ }
++
++ // (tw) Hack as dependencies get wrong version of klassOop
++ if(this->old_version() != NULL) {
++ ((instanceKlass *)this->old_version()->klass_part())->remove_dependent_nmethod(nm);
++ return;
++ }
++
+ #ifdef ASSERT
+ tty->print_cr("### %s can't find dependent nmethod:", this->external_name());
+ nm->print();
+@@ -2417,6 +2712,9 @@
+ klassOop mirrored_klass = java_lang_Class::as_klassOop(obj);
+ st->print(BULLET"fake entry for mirror: ");
+ mirrored_klass->print_value_on(st);
++ if (mirrored_klass != NULL) {
++ st->print_cr("revision: %d (oldest=%d, newest=%d)", mirrored_klass->klass_part()->revision_number(), mirrored_klass->klass_part()->oldest_version()->klass_part()->revision_number(), mirrored_klass->klass_part()->newest_version()->klass_part()->revision_number());
++ }
+ st->cr();
+ st->print(BULLET"fake entry resolved_constructor: ");
+ methodOop ctor = java_lang_Class::resolved_constructor(obj);
+diff -r 882f6c762ac5 src/share/vm/oops/instanceKlass.hpp
+--- a/src/share/vm/oops/instanceKlass.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/instanceKlass.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -102,6 +102,22 @@
+ virtual void do_field(fieldDescriptor* fd) = 0;
+ };
+
++// (tw) Iterates over the fields of the old and new class
++class FieldEvolutionClosure : public StackObj {
++public:
++ virtual void do_new_field(fieldDescriptor* fd) = 0;
++ virtual void do_old_field(fieldDescriptor* fd) = 0;
++ virtual void do_changed_field(fieldDescriptor* old_fd, fieldDescriptor *new_fd) = 0;
++};
++
++// (tw) Iterates over the methods of the old and new class
++class MethodEvolutionClosure : public StackObj {
++public:
++ virtual void do_new_method(methodOop oop) = 0;
++ virtual void do_old_method(methodOop oop) = 0;
++ virtual void do_changed_method(methodOop oldOop, methodOop newOop) = 0;
++};
++
+ #ifndef PRODUCT
+ // Print fields.
+ // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
+@@ -287,6 +303,11 @@
+ // _idnum_allocated_count.
+ u1 _init_state; // state of class
+
++ // (tw) Field that allows for a short-path when calculating updated fields for the second time and
++ // no fields changed. Testing performance impact with this, can be removed later when the update
++ // information is cached.
++ bool _fields_not_changed;
++
+ u1 _reference_type; // reference type
+
+ // embedded Java vtable follows here
+@@ -454,6 +475,7 @@
+ // initialization (virtuals from Klass)
+ bool should_be_initialized() const; // means that initialize should be called
+ void initialize(TRAPS);
++ void initialize_redefined_class();
+ void link_class(TRAPS);
+ bool link_class_or_fail(TRAPS); // returns false on failure
+ void unlink_class();
+@@ -631,6 +653,7 @@
+ static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
+ size_t *length_p, jmethodID* id_p);
+ jmethodID jmethod_id_or_null(methodOop method);
++ bool update_jmethod_id(methodOop method, jmethodID newMethodID);
+
+ // cached itable index support
+ void set_cached_itable_index(size_t idnum, int index);
+@@ -713,6 +736,7 @@
+
+ // subclass/subinterface checks
+ bool implements_interface(klassOop k) const;
++ bool implements_interface_any_version(klassOop k) const;
+
+ // Access to the implementor of an interface.
+ klassOop implementor() const
+@@ -762,6 +786,12 @@
+ void do_local_static_fields(FieldClosure* cl);
+ void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
+ void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
++ void do_fields_evolution(FieldEvolutionClosure *cl);
++ void store_update_information(GrowableArray<int> &values);
++ void clear_update_information();
++ void store_type_check_information(GrowableArray< Pair<int, klassOop> > &values);
++ void clear_type_check_information();
++
+
+ void methods_do(void f(methodOop method));
+ void array_klasses_do(void f(klassOop k));
+diff -r 882f6c762ac5 src/share/vm/oops/instanceKlassKlass.cpp
+--- a/src/share/vm/oops/instanceKlassKlass.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/instanceKlassKlass.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -480,6 +480,28 @@
+ instanceKlass* ik = instanceKlass::cast(klassOop(obj));
+ klassKlass::oop_print_on(obj, st);
+
++ // (tw) Output revision number and revision numbers of older / newer and oldest / newest version of this class.
++
++ st->print(BULLET"revision: %d", ik->revision_number());
++
++ if (ik->new_version() != NULL) {
++ st->print(" (newer=%d)", ik->new_version()->klass_part()->revision_number());
++ }
++
++ if (ik->newest_version() != ik->new_version() && ik->newest_version() != obj) {
++ st->print(" (newest=%d)", ik->newest_version()->klass_part()->revision_number());
++ }
++
++ if (ik->old_version() != NULL) {
++ st->print(" (old=%d)", ik->old_version()->klass_part()->revision_number());
++ }
++
++ if (ik->oldest_version() != ik->old_version() && ik->oldest_version() != obj) {
++ st->print(" (oldest=%d)", ik->oldest_version()->klass_part()->revision_number());
++ }
++
++ st->cr();
++
+ st->print(BULLET"instance size: %d", ik->size_helper()); st->cr();
+ st->print(BULLET"klass size: %d", ik->object_size()); st->cr();
+ st->print(BULLET"access: "); ik->access_flags().print_on(st); st->cr();
+@@ -663,7 +685,7 @@
+ }
+ guarantee(sib->as_klassOop()->is_klass(), "should be klass");
+ guarantee(sib->as_klassOop()->is_perm(), "should be in permspace");
+- guarantee(sib->super() == super, "siblings should have same superklass");
++ guarantee(sib->super() == super || super->klass_part()->newest_version() == SystemDictionary::Object_klass(), "siblings should have same superklass");
+ sib = sib->next_sibling();
+ }
+
+diff -r 882f6c762ac5 src/share/vm/oops/instanceRefKlass.cpp
+--- a/src/share/vm/oops/instanceRefKlass.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/instanceRefKlass.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -455,10 +455,13 @@
+ instanceKlass* ik = instanceKlass::cast(k);
+
+ // Check that we have the right class
+- debug_only(static bool first_time = true);
+- assert(k == SystemDictionary::Reference_klass() && first_time,
+- "Invalid update of maps");
+- debug_only(first_time = false);
++
++ // (tw) Asserts no longer valid for class redefinition
++ // debug_only(static bool first_time = true);
++
++ //assert(k == SystemDictionary::Reference_klass() && first_time,
++ // "Invalid update of maps");
++ //debug_only(first_time = false);
+ assert(ik->nonstatic_oop_map_count() == 1, "just checking");
+
+ OopMapBlock* map = ik->start_of_nonstatic_oop_maps();
+diff -r 882f6c762ac5 src/share/vm/oops/klass.cpp
+--- a/src/share/vm/oops/klass.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/klass.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -55,6 +55,26 @@
+ return false;
+ }
+
++void Klass::update_supers_to_newest_version() {
++
++ if (super() != NULL) set_super(super()->klass_part()->newest_version());
++
++ for (uint i=0; i<primary_super_limit(); i++) {
++ klassOop cur = _primary_supers[i];
++ if (cur != NULL) {
++ _primary_supers[i] = cur->klass_part()->newest_version();
++ }
++ }
++
++ // Scan the array-of-objects
++ int cnt = secondary_supers()->length();
++ for (int i = 0; i < cnt; i++) {
++ klassOop cur = (klassOop)secondary_supers()->obj_at(i);
++ if (cur != NULL) {
++ secondary_supers()->obj_at_put(i, cur->klass_part()->newest_version());
++ }
++ }
++}
+ bool Klass::search_secondary_supers(klassOop k) const {
+ // Put some extra logic here out-of-line, before the search proper.
+ // This cuts down the size of the inline method.
+@@ -170,6 +190,16 @@
+ kl->set_alloc_size(0);
+ TRACE_INIT_ID(kl);
+
++ kl->set_redefinition_flags(Klass::NoRedefinition);
++ kl->set_redefining(false);
++ kl->set_new_version(NULL);
++ kl->set_old_version(NULL);
++ kl->set_redefinition_index(-1);
++ kl->set_revision_number(-1);
++ kl->set_field_redefinition_policy(DynamicCheck);
++ kl->set_static_field_redefinition_policy(AccessDeletedMembers);
++ kl->set_method_redefinition_policy(AccessDeletedMembers);
++
+ kl->set_prototype_header(markOopDesc::prototype());
+ kl->set_biased_lock_revocation_count(0);
+ kl->set_last_biased_lock_bulk_revocation_time(0);
+@@ -241,7 +271,7 @@
+ set_super(NULL);
+ oop_store_without_check((oop*) &_primary_supers[0], (oop) this->as_klassOop());
+ assert(super_depth() == 0, "Object must already be initialized properly");
+- } else if (k != super() || k == SystemDictionary::Object_klass()) {
++ } else if (k != super() || k->klass_part()->super() == NULL) {
+ assert(super() == NULL || super() == SystemDictionary::Object_klass(),
+ "initialize this only once to a non-trivial value");
+ set_super(k);
+diff -r 882f6c762ac5 src/share/vm/oops/klass.hpp
+--- a/src/share/vm/oops/klass.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/klass.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -171,6 +171,7 @@
+ void* operator new(size_t ignored, KlassHandle& klass, int size, TRAPS);
+ };
+
++template<class L, class R> class Pair;
+
+ class Klass : public Klass_vtbl {
+ friend class VMStructs;
+@@ -223,6 +224,39 @@
+ oop* oop_block_beg() const { return adr_secondary_super_cache(); }
+ oop* oop_block_end() const { return adr_next_sibling() + 1; }
+
++ // (tw) Different class redefinition flags of code evolution.
++ enum RedefinitionFlags {
++
++ // This class is not redefined at all!
++ NoRedefinition,
++
++ // There are changes to the class meta data.
++ ModifyClass = 1,
++
++ // The size of the class meta data changes.
++ ModifyClassSize = ModifyClass << 1,
++
++ // There are change to the instance format.
++ ModifyInstances = ModifyClassSize << 1,
++
++ // The size of instances changes.
++ ModifyInstanceSize = ModifyInstances << 1,
++
++ // A super type of this class is removed.
++ RemoveSuperType = ModifyInstanceSize << 1,
++
++ // This class (or one of its super classes) has an instance transformer method.
++ HasInstanceTransformer = RemoveSuperType << 1,
++ };
++
++ // (tw) Different policies dealing with deleted fields / methods in old code.
++ enum RedefinitionPolicy {
++ StaticCheck,
++ DynamicCheck,
++ AccessDeletedMembers,
++ AccessOldMembers
++ };
++
+ protected:
+ //
+ // The oop block. All oop fields must be declared here and only oop fields
+@@ -242,6 +276,10 @@
+ oop _java_mirror;
+ // Superclass
+ klassOop _super;
++ // Old class
++ klassOop _old_version;
++ // New class
++ klassOop _new_version;
+ // First subclass (NULL if none); _subklass->next_sibling() is next one
+ klassOop _subklass;
+ // Sibling link (or NULL); links all subklasses of a klass
+@@ -254,6 +292,19 @@
+ jint _modifier_flags; // Processed access flags, for use by Class.getModifiers.
+ AccessFlags _access_flags; // Access flags. The class/interface distinction is stored here.
+
++ // (tw) Non-oop fields for enhanced class redefinition
++ jint _revision_number; // The revision number for redefined classes
++ jint _redefinition_index; // Index of this class when performing the redefinition
++ bool _subtype_changed;
++ int _redefinition_flags; // Level of class redefinition
++ bool _is_copying_backwards; // Does the class need to copy fields backwards? => possibly overwrite itself?
++ int * _update_information; // Update information
++ Pair<int, klassOop> * _type_check_information; // Offsets of object fields that need a type check
++ char _method_redefinition_policy;
++ char _field_redefinition_policy;
++ char _static_field_redefinition_policy;
++ bool _is_redefining;
++
+ #ifndef PRODUCT
+ int _verify_count; // to avoid redundant verifies
+ #endif
+@@ -302,6 +353,99 @@
+ klassOop secondary_super_cache() const { return _secondary_super_cache; }
+ void set_secondary_super_cache(klassOop k) { oop_store_without_check((oop*) &_secondary_super_cache, (oop) k); }
+
++ // BEGIN class redefinition utilities
++
++ // double links between new and old version of a class
++ klassOop old_version() const { return _old_version; }
++ void set_old_version(klassOop klass) { assert(_old_version == NULL || klass == NULL, "Can only be set once!"); _old_version = klass; }
++ klassOop new_version() const { return _new_version; }
++ void set_new_version(klassOop klass) { assert(_new_version == NULL || klass == NULL, "Can only be set once!"); _new_version = klass; }
++
++ // A subtype of this class is no longer a subtype
++ bool has_subtype_changed() const { return _subtype_changed; }
++ void set_subtype_changed(bool b) { assert(is_newest_version() || new_version()->klass_part()->is_newest_version(), "must be newest or second newest version");
++ _subtype_changed = b; }
++ // state of being redefined
++ int redefinition_index() const { return _redefinition_index; }
++ void set_redefinition_index(int index) { _redefinition_index = index; }
++ void set_redefining(bool b) { _is_redefining = b; }
++ bool is_redefining() const { return _is_redefining; }
++ int redefinition_flags() const { return _redefinition_flags; }
++ bool check_redefinition_flag(int flags) const { return (_redefinition_flags & flags) != 0; }
++ void set_redefinition_flags(int flags) { _redefinition_flags = flags; }
++ bool is_copying_backwards() const { return _is_copying_backwards; }
++ void set_copying_backwards(bool b) { _is_copying_backwards = b; }
++
++ // update information
++ int *update_information() const { return _update_information; }
++ void set_update_information(int *info) { _update_information = info; }
++ Pair<int, klassOop> *type_check_information() const { return _type_check_information; }
++ void set_type_check_information(Pair<int, klassOop> *info) { _type_check_information = info; }
++
++ bool is_same_or_older_version(klassOop klass) const {
++ if (Klass::cast(klass) == this) { return true; }
++ else if (_old_version == NULL) { return false; }
++ else { return _old_version->klass_part()->is_same_or_older_version(klass); }
++ }
++
++ // Revision number for redefined classes, -1 for originally loaded classes
++ jint revision_number() const {
++ return _revision_number;
++ }
++
++ bool was_redefined() const {
++ return _revision_number != -1;
++ }
++
++ void set_revision_number(jint number) {
++ _revision_number = number;
++ }
++
++ char method_redefinition_policy() {
++ return _method_redefinition_policy;
++ }
++
++ void set_method_redefinition_policy(char v) {
++ _method_redefinition_policy = v;
++ }
++
++ char field_redefinition_policy() {
++ return _field_redefinition_policy;
++ }
++
++ void set_field_redefinition_policy(char v) {
++ _field_redefinition_policy = v;
++ }
++
++ char static_field_redefinition_policy() {
++ return _static_field_redefinition_policy;
++ }
++
++ void set_static_field_redefinition_policy(char v) {
++ _static_field_redefinition_policy = v;
++ }
++
++ klassOop oldest_version() const {
++ if (_old_version == NULL) { return this->as_klassOop(); }
++ else { return _old_version->klass_part()->oldest_version(); };
++ }
++
++ klassOop newest_version() const {
++ if (_new_version == NULL) { return this->as_klassOop(); }
++ else { return _new_version->klass_part()->newest_version(); };
++ }
++
++ klassOop active_version() const {
++ if (_new_version == NULL || _new_version->klass_part()->is_redefining()) { return this->as_klassOop(); assert(!this->is_redefining(), "just checking"); }
++ else { return _new_version->klass_part()->active_version(); };
++ }
++
++ bool is_newest_version() const {
++ return _new_version == NULL;
++ }
++
++ // END class redefinition utilities
++
+ objArrayOop secondary_supers() const { return _secondary_supers; }
+ void set_secondary_supers(objArrayOop k) { oop_store_without_check((oop*) &_secondary_supers, (oop) k); }
+
+@@ -362,6 +506,8 @@
+ void set_next_sibling(klassOop s);
+
+ oop* adr_super() const { return (oop*)&_super; }
++ oop* adr_old_version() const { return (oop*)&_old_version; }
++ oop* adr_new_version() const { return (oop*)&_new_version; }
+ oop* adr_primary_supers() const { return (oop*)&_primary_supers[0]; }
+ oop* adr_secondary_super_cache() const { return (oop*)&_secondary_super_cache; }
+ oop* adr_secondary_supers()const { return (oop*)&_secondary_supers; }
+@@ -491,6 +637,7 @@
+ return search_secondary_supers(k);
+ }
+ }
++ void update_supers_to_newest_version();
+ bool search_secondary_supers(klassOop k) const;
+
+ // Find LCA in class hierarchy
+@@ -818,6 +965,8 @@
+
+
+ inline oop klassOopDesc::java_mirror() const { return klass_part()->java_mirror(); }
++inline klassOop klassOopDesc::old_version() const { return klass_part()->old_version(); }
++inline klassOop klassOopDesc::new_version() const { return klass_part()->new_version(); }
+
+
+ #endif // SHARE_VM_OOPS_KLASS_HPP
+diff -r 882f6c762ac5 src/share/vm/oops/klassKlass.cpp
+--- a/src/share/vm/oops/klassKlass.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/klassKlass.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -68,6 +68,8 @@
+ Klass* k = Klass::cast(klassOop(obj));
+ // If we are alive it is valid to keep our superclass and subtype caches alive
+ MarkSweep::mark_and_push(k->adr_super());
++ MarkSweep::mark_and_push(k->adr_old_version());
++ MarkSweep::mark_and_push(k->adr_new_version());
+ for (juint i = 0; i < Klass::primary_super_limit(); i++)
+ MarkSweep::mark_and_push(k->adr_primary_supers()+i);
+ MarkSweep::mark_and_push(k->adr_secondary_super_cache());
+@@ -87,6 +89,8 @@
+ Klass* k = Klass::cast(klassOop(obj));
+ // If we are alive it is valid to keep our superclass and subtype caches alive
+ PSParallelCompact::mark_and_push(cm, k->adr_super());
++ PSParallelCompact::mark_and_push(cm, k->adr_old_version());
++ PSParallelCompact::mark_and_push(cm, k->adr_new_version());
+ for (juint i = 0; i < Klass::primary_super_limit(); i++)
+ PSParallelCompact::mark_and_push(cm, k->adr_primary_supers()+i);
+ PSParallelCompact::mark_and_push(cm, k->adr_secondary_super_cache());
+@@ -106,6 +110,8 @@
+ int size = oop_size(obj);
+ Klass* k = Klass::cast(klassOop(obj));
+ blk->do_oop(k->adr_super());
++ blk->do_oop(k->adr_old_version());
++ blk->do_oop(k->adr_new_version());
+ for (juint i = 0; i < Klass::primary_super_limit(); i++)
+ blk->do_oop(k->adr_primary_supers()+i);
+ blk->do_oop(k->adr_secondary_super_cache());
+@@ -134,6 +140,10 @@
+ oop* adr;
+ adr = k->adr_super();
+ if (mr.contains(adr)) blk->do_oop(adr);
++ adr = k->adr_old_version();
++ if (mr.contains(adr)) blk->do_oop(adr);
++ adr = k->adr_new_version();
++ if (mr.contains(adr)) blk->do_oop(adr);
+ for (juint i = 0; i < Klass::primary_super_limit(); i++) {
+ adr = k->adr_primary_supers()+i;
+ if (mr.contains(adr)) blk->do_oop(adr);
+@@ -147,6 +157,8 @@
+ // The following are "weak links" in the perm gen and are
+ // treated specially in a later phase of a perm gen collection.
+ assert(oop(k)->is_perm(), "should be in perm");
++ assert(oop(k->adr_old_version())->is_perm(), "should be in perm");
++ assert(oop(k->adr_new_version())->is_perm(), "should be in perm");
+ assert(oop(k->adr_subklass())->is_perm(), "should be in perm");
+ assert(oop(k->adr_next_sibling())->is_perm(), "should be in perm");
+ if (blk->should_remember_klasses()
+@@ -167,6 +179,8 @@
+ Klass* k = Klass::cast(klassOop(obj));
+
+ MarkSweep::adjust_pointer(k->adr_super());
++ MarkSweep::adjust_pointer(k->adr_new_version());
++ MarkSweep::adjust_pointer(k->adr_old_version());
+ for (juint i = 0; i < Klass::primary_super_limit(); i++)
+ MarkSweep::adjust_pointer(k->adr_primary_supers()+i);
+ MarkSweep::adjust_pointer(k->adr_secondary_super_cache());
+diff -r 882f6c762ac5 src/share/vm/oops/klassOop.hpp
+--- a/src/share/vm/oops/klassOop.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/klassOop.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -41,8 +41,10 @@
+ // returns the Klass part containing dispatching behavior
+ Klass* klass_part() const { return (Klass*)((address)this + sizeof(klassOopDesc)); }
+
+- // Convenience wrapper
++ // Convenience wrappers
+ inline oop java_mirror() const;
++ inline klassOop old_version() const;
++ inline klassOop new_version() const;
+
+ private:
+ // These have no implementation since klassOop should never be accessed in this fashion
+diff -r 882f6c762ac5 src/share/vm/oops/klassVtable.cpp
+--- a/src/share/vm/oops/klassVtable.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/klassVtable.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -97,7 +97,8 @@
+ vtable_length = Universe::base_vtable_size();
+ }
+
+- if (super == NULL && !Universe::is_bootstrapping() &&
++ // (tw) TODO: Check if we can relax the condition on a fixed base vtable size
++ /*if (super == NULL && !Universe::is_bootstrapping() &&
+ vtable_length != Universe::base_vtable_size()) {
+ // Someone is attempting to redefine java.lang.Object incorrectly. The
+ // only way this should happen is from
+@@ -107,9 +108,9 @@
+ vtable_length = Universe::base_vtable_size();
+ }
+ assert(super != NULL || vtable_length == Universe::base_vtable_size(),
+- "bad vtable size for class Object");
++ "bad vtable size for class Object");*/
+ assert(vtable_length % vtableEntry::size() == 0, "bad vtable length");
+- assert(vtable_length >= Universe::base_vtable_size(), "vtable too small");
++ //assert(vtable_length >= Universe::base_vtable_size(), "vtable too small");
+ }
+
+ int klassVtable::index_of(methodOop m, int len) const {
+@@ -678,20 +679,6 @@
+ return true;
+ }
+
+-void klassVtable::dump_vtable() {
+- tty->print_cr("vtable dump --");
+- for (int i = 0; i < length(); i++) {
+- methodOop m = unchecked_method_at(i);
+- if (m != NULL) {
+- tty->print(" (%5d) ", i);
+- m->access_flags().print_on(tty);
+- tty->print(" -- ");
+- m->print_name(tty);
+- tty->cr();
+- }
+- }
+-}
+-
+ // CDS/RedefineClasses support - clear vtables so they can be reinitialized
+ void klassVtable::clear_vtable() {
+ for (int i = 0; i < _length; i++) table()[i].clear();
+@@ -1262,6 +1249,7 @@
+
+ void klassVtable::verify_against(outputStream* st, klassVtable* vt, int index) {
+ vtableEntry* vte = &vt->table()[index];
++ if (vte->method() == NULL || table()[index].method() == NULL) return;
+ if (vte->method()->name() != table()[index].method()->name() ||
+ vte->method()->signature() != table()[index].method()->signature()) {
+ fatal("mismatched name/signature of vtable entries");
+@@ -1281,6 +1269,8 @@
+
+ void vtableEntry::verify(klassVtable* vt, outputStream* st) {
+ NOT_PRODUCT(FlagSetting fs(IgnoreLockingAssertions, true));
++ // (tw) TODO: Check: Does not hold?
++ if (method() != NULL) {
+ assert(method() != NULL, "must have set method");
+ method()->verify();
+ // we sub_type, because it could be a miranda method
+@@ -1288,7 +1278,13 @@
+ #ifndef PRODUCT
+ print();
+ #endif
+- fatal(err_msg("vtableEntry " PTR_FORMAT ": method is from subclass", this));
++ klassOop first_klass = vt->klass()();
++ klassOop second_klass = method()->method_holder();
++ // (tw) the following fatal does not work for old versions of classes
++ if (first_klass->klass_part()->is_newest_version()) {
++ //fatal1("vtableEntry %#lx: method is from subclass", this);
++ }
++ }
+ }
+ }
+
+@@ -1296,7 +1292,7 @@
+
+ void vtableEntry::print() {
+ ResourceMark rm;
+- tty->print("vtableEntry %s: ", method()->name()->as_C_string());
++ tty->print("vtableEntry %s: ", (method() == NULL) ? "null" : method()->name()->as_C_string());
+ if (Verbose) {
+ tty->print("m %#lx ", (address)method());
+ }
+@@ -1363,6 +1359,33 @@
+ tty->print_cr("%6d bytes total", total);
+ }
+
++bool klassVtable::check_no_old_entries() {
++ // Check that there really is no entry
++ for (int i = 0; i < length(); i++) {
++ methodOop m = unchecked_method_at(i);
++ if (m != NULL) {
++ if (m->is_old() || !m->method_holder()->klass_part()->is_newest_version()) {
++ return false;
++ }
++ }
++ }
++ return true;
++}
++
++void klassVtable::dump_vtable() {
++ tty->print_cr("vtable dump --");
++ for (int i = 0; i < length(); i++) {
++ methodOop m = unchecked_method_at(i);
++ if (m != NULL) {
++ tty->print(" (%5d) ", i);
++ m->access_flags().print_on(tty);
++ tty->print(" -- ");
++ m->print_name(tty);
++ tty->cr();
++ }
++ }
++}
++
+ int klassItable::_total_classes; // Total no. of classes with itables
+ long klassItable::_total_size; // Total no. of bytes used for itables
+
+diff -r 882f6c762ac5 src/share/vm/oops/klassVtable.hpp
+--- a/src/share/vm/oops/klassVtable.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/klassVtable.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -100,6 +100,7 @@
+ int methods_length, bool * trace_name_printed);
+ bool check_no_old_or_obsolete_entries();
+ void dump_vtable();
++ bool check_no_old_entries();
+
+ // Garbage collection
+ void oop_follow_contents();
+diff -r 882f6c762ac5 src/share/vm/oops/methodKlass.cpp
+--- a/src/share/vm/oops/methodKlass.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/methodKlass.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -93,6 +93,10 @@
+ m->set_adapter_entry(NULL);
+ m->clear_code(); // from_c/from_i get set to c2i/i2i
+
++ m->set_forward_method(NULL);
++ m->set_new_version(NULL);
++ m->set_old_version(NULL);
++
+ if (access_flags.is_native()) {
+ m->clear_native_function();
+ m->set_signature_handler(NULL);
+@@ -122,6 +126,9 @@
+ // Performance tweak: We skip iterating over the klass pointer since we
+ // know that Universe::methodKlassObj never moves.
+ MarkSweep::mark_and_push(m->adr_constMethod());
++ MarkSweep::mark_and_push(m->adr_forward_method());
++ MarkSweep::mark_and_push(m->adr_new_version());
++ MarkSweep::mark_and_push(m->adr_old_version());
+ if (m->method_data() != NULL) {
+ MarkSweep::mark_and_push(m->adr_method_data());
+ }
+@@ -135,6 +142,9 @@
+ // Performance tweak: We skip iterating over the klass pointer since we
+ // know that Universe::methodKlassObj never moves.
+ PSParallelCompact::mark_and_push(cm, m->adr_constMethod());
++ PSParallelCompact::mark_and_push(cm, m->adr_forward_method());
++ PSParallelCompact::mark_and_push(cm, m->adr_new_version());
++ PSParallelCompact::mark_and_push(cm, m->adr_old_version());
+ #ifdef COMPILER2
+ if (m->method_data() != NULL) {
+ PSParallelCompact::mark_and_push(cm, m->adr_method_data());
+@@ -152,6 +162,9 @@
+ // Performance tweak: We skip iterating over the klass pointer since we
+ // know that Universe::methodKlassObj never moves
+ blk->do_oop(m->adr_constMethod());
++ blk->do_oop(m->adr_forward_method());
++ blk->do_oop(m->adr_new_version());
++ blk->do_oop(m->adr_old_version());
+ if (m->method_data() != NULL) {
+ blk->do_oop(m->adr_method_data());
+ }
+@@ -170,6 +183,12 @@
+ oop* adr;
+ adr = m->adr_constMethod();
+ if (mr.contains(adr)) blk->do_oop(adr);
++ adr = m->adr_new_version();
++ if (mr.contains(adr)) blk->do_oop(adr);
++ adr = m->adr_forward_method();
++ if (mr.contains(adr)) blk->do_oop(adr);
++ adr = m->adr_old_version();
++ if (mr.contains(adr)) blk->do_oop(adr);
+ if (m->method_data() != NULL) {
+ adr = m->adr_method_data();
+ if (mr.contains(adr)) blk->do_oop(adr);
+@@ -187,6 +206,9 @@
+ // Performance tweak: We skip iterating over the klass pointer since we
+ // know that Universe::methodKlassObj never moves.
+ MarkSweep::adjust_pointer(m->adr_constMethod());
++ MarkSweep::adjust_pointer(m->adr_forward_method());
++ MarkSweep::adjust_pointer(m->adr_new_version());
++ MarkSweep::adjust_pointer(m->adr_old_version());
+ if (m->method_data() != NULL) {
+ MarkSweep::adjust_pointer(m->adr_method_data());
+ }
+@@ -202,6 +224,9 @@
+ assert(obj->is_method(), "should be method");
+ methodOop m = methodOop(obj);
+ PSParallelCompact::adjust_pointer(m->adr_constMethod());
++ PSParallelCompact::adjust_pointer(m->adr_forward_method());
++ PSParallelCompact::adjust_pointer(m->adr_new_version());
++ PSParallelCompact::adjust_pointer(m->adr_old_version());
+ #ifdef COMPILER2
+ if (m->method_data() != NULL) {
+ PSParallelCompact::adjust_pointer(m->adr_method_data());
+@@ -222,7 +247,18 @@
+ methodOop m = methodOop(obj);
+ // get the effect of PrintOopAddress, always, for methods:
+ st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)m);
+- st->print (" - method holder: "); m->method_holder()->print_value_on(st); st->cr();
++ st->print (" - method holder: "); m->method_holder()->print_value_on(st);
++
++ if (m->method_holder()->klass_part()->new_version() != NULL) {
++ st->print(" (old)");
++ }
++ st->cr();
++
++ st->print_cr(" - is obsolete: %d", (int)(m->is_obsolete()));
++ st->print_cr(" - is old: %d", (int)(m->is_old()));
++ st->print_cr(" - new version: "INTPTR_FORMAT" ", (address)(m->new_version()));
++ st->print_cr(" - old version: "INTPTR_FORMAT" ", (address)(m->old_version()));
++ st->print_cr(" - holder revision: %d", m->method_holder()->klass_part()->revision_number());
+ st->print (" - constants: "INTPTR_FORMAT" ", (address)m->constants());
+ m->constants()->print_value_on(st); st->cr();
+ st->print (" - access: 0x%x ", m->access_flags().as_int()); m->access_flags().print_on(st); st->cr();
+diff -r 882f6c762ac5 src/share/vm/oops/methodOop.cpp
+--- a/src/share/vm/oops/methodOop.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/methodOop.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -328,6 +328,70 @@
+ }
+
+
++bool methodOopDesc::is_in_code_section(int bci) {
++ // There is no table => every bci is in the code section table.
++ if (!constMethod()->has_code_section_table()) return true;
++
++ constMethodOop m = constMethod();
++ for (int i = 0; i < m->code_section_entries(); ++i) {
++ u2 new_index = m->code_section_new_index_at(i);
++ u2 length = m->code_section_length_at(i);
++ if (bci >= new_index && bci < new_index + length) {
++ // We are in a specified code section.
++ return true;
++ }
++ }
++
++ return false;
++}
++
++int methodOopDesc::calculate_forward_bci(int bci, methodOop new_method) {
++ int original_bci = -1;
++ if (constMethod()->has_code_section_table()) {
++ assert(is_in_code_section(bci), "can only forward in section");
++ // First calculate back to original bci.
++ constMethodOop m = constMethod();
++ for (int i = 0; i < m->code_section_entries(); ++i) {
++ u2 new_index = m->code_section_new_index_at(i);
++ u2 original_index = m->code_section_original_index_at(i);
++ u2 length = m->code_section_length_at(i);
++ if (bci >= new_index && bci < new_index + length) {
++ // We are in a specified code section.
++ original_bci = bci - new_index + original_index;
++ break;
++ }
++ }
++ assert (original_bci != -1, "must have been in code section");
++ } else {
++ // No code sections specified => we are in an original method.
++ original_bci = bci;
++ }
++
++ // We know the original bci => match to new method.
++ int new_bci = -1;
++ if (new_method->constMethod()->has_code_section_table()) {
++ // Map to new bci.
++ constMethodOop m = new_method->constMethod();
++ for (int i = 0; i < m->code_section_entries(); ++i) {
++ u2 new_index = m->code_section_new_index_at(i);
++ u2 original_index = m->code_section_original_index_at(i);
++ u2 length = m->code_section_length_at(i);
++ if (original_bci >= original_index && original_bci < original_index + length) {
++ new_bci = original_bci - original_index + new_index;
++ break;
++ }
++ }
++ assert (new_bci != -1, "must have found new code section");
++
++ } else {
++ // We are in an original method.
++ new_bci = original_bci;
++ }
++
++ return new_bci;
++}
++
++
+ int methodOopDesc::extra_stack_words() {
+ // not an inline function, to avoid a header dependency on Interpreter
+ return extra_stack_entries() * Interpreter::stackElementSize;
+@@ -1061,6 +1125,9 @@
+
+ // Reset correct method/const method, method size, and parameter info
+ newm->set_constMethod(newcm);
++ newm->set_forward_method(newm->forward_method());
++ newm->set_new_version(newm->new_version());
++ newm->set_old_version(newm->old_version());
+ newm->constMethod()->set_code_size(new_code_length);
+ newm->constMethod()->set_constMethod_size(new_const_method_size);
+ newm->set_method_size(new_method_size);
+diff -r 882f6c762ac5 src/share/vm/oops/methodOop.hpp
+--- a/src/share/vm/oops/methodOop.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/methodOop.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -114,6 +114,11 @@
+ AccessFlags _access_flags; // Access flags
+ int _vtable_index; // vtable index of this method (see VtableIndexFlag)
+ // note: can have vtables with >2**16 elements (because of inheritance)
++ // (tw) Newer version of method available?
++ methodOop _forward_method;
++ methodOop _new_version;
++ methodOop _old_version;
++
+ #ifdef CC_INTERP
+ int _result_index; // C++ interpreter needs for converting results to/from stack
+ #endif
+@@ -175,6 +180,32 @@
+ int name_index() const { return constMethod()->name_index(); }
+ void set_name_index(int index) { constMethod()->set_name_index(index); }
+
++ methodOop forward_method() const {return _forward_method; }
++ void set_forward_method(methodOop m) { _forward_method = m; }
++ bool has_forward_method() const { return forward_method() != NULL; }
++ methodOop new_version() const {return _new_version; }
++ void set_new_version(methodOop m) { _new_version = m; }
++ methodOop newest_version() { if(_new_version == NULL) return this; else return new_version()->newest_version(); }
++
++ methodOop old_version() const {return _old_version; };
++ void set_old_version(methodOop m) {
++ if (m == NULL) {
++ _old_version = NULL;
++ return;
++ }
++
++ assert(_old_version == NULL, "may only be set once");
++ assert(this->code_size() == m->code_size(), "must have same code length");
++ _old_version = m;
++ }
++
++ methodOop oldest_version() const {
++ if(_old_version == NULL) return (methodOop)this;
++ else {
++ return old_version()->oldest_version();
++ }
++ }
++
+ // signature
+ Symbol* signature() const { return constants()->symbol_at(signature_index()); }
+ int signature_index() const { return constMethod()->signature_index(); }
+@@ -670,6 +701,10 @@
+ // Inline cache support
+ void cleanup_inline_caches();
+
++ // (tw) Method forwarding support.
++ bool is_in_code_section(int bci);
++ int calculate_forward_bci(int bci, methodOop new_method);
++
+ // Find if klass for method is loaded
+ bool is_klass_loaded_by_klass_index(int klass_index) const;
+ bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
+@@ -734,6 +769,9 @@
+
+ // Garbage collection support
+ oop* adr_constMethod() const { return (oop*)&_constMethod; }
++ oop* adr_forward_method() const { return (oop*)&_forward_method; }
++ oop* adr_new_version() const { return (oop*)&_new_version; }
++ oop* adr_old_version() const { return (oop*)&_old_version; }
+ oop* adr_method_data() const { return (oop*)&_method_data; }
+ };
+
+diff -r 882f6c762ac5 src/share/vm/oops/oop.hpp
+--- a/src/share/vm/oops/oop.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/oop.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -95,6 +95,7 @@
+ narrowOop* compressed_klass_addr();
+
+ void set_klass(klassOop k);
++ void set_klass_no_check(klassOop k);
+
+ // For klass field compression
+ int klass_gap() const;
+@@ -135,6 +136,7 @@
+ bool is_array() const;
+ bool is_objArray() const;
+ bool is_klass() const;
++ bool is_instanceKlass() const;
+ bool is_thread() const;
+ bool is_method() const;
+ bool is_constMethod() const;
+diff -r 882f6c762ac5 src/share/vm/oops/oop.inline.hpp
+--- a/src/share/vm/oops/oop.inline.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/oops/oop.inline.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -123,6 +123,14 @@
+ }
+ }
+
++inline void oopDesc::set_klass_no_check(klassOop k) {
++ if (UseCompressedOops) {
++ oop_store_without_check(compressed_klass_addr(), (oop)k);
++ } else {
++ oop_store_without_check(klass_addr(), (oop) k);
++ }
++}
++
+ inline int oopDesc::klass_gap() const {
+ return *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes());
+ }
+@@ -156,6 +164,7 @@
+ inline bool oopDesc::is_typeArray() const { return blueprint()->oop_is_typeArray(); }
+ inline bool oopDesc::is_javaArray() const { return blueprint()->oop_is_javaArray(); }
+ inline bool oopDesc::is_klass() const { return blueprint()->oop_is_klass(); }
++inline bool oopDesc::is_instanceKlass() const { return blueprint()->oop_is_instanceKlass(); }
+ inline bool oopDesc::is_thread() const { return blueprint()->oop_is_thread(); }
+ inline bool oopDesc::is_method() const { return blueprint()->oop_is_method(); }
+ inline bool oopDesc::is_constMethod() const { return blueprint()->oop_is_constMethod(); }
+diff -r 882f6c762ac5 src/share/vm/prims/jni.cpp
+--- a/src/share/vm/prims/jni.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/prims/jni.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -406,7 +406,7 @@
+ }
+ }
+ klassOop k = SystemDictionary::resolve_from_stream(class_name, class_loader,
+- Handle(), &st, true,
++ Handle(), &st, true, KlassHandle(),
+ CHECK_NULL);
+
+ if (TraceClassResolution && k != NULL) {
+diff -r 882f6c762ac5 src/share/vm/prims/jvm.cpp
+--- a/src/share/vm/prims/jvm.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/prims/jvm.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -932,7 +932,7 @@
+ Handle protection_domain (THREAD, JNIHandles::resolve(pd));
+ klassOop k = SystemDictionary::resolve_from_stream(class_name, class_loader,
+ protection_domain, &st,
+- verify != 0,
++ verify != 0, KlassHandle(),
+ CHECK_NULL);
+
+ if (TraceClassResolution && k != NULL) {
+diff -r 882f6c762ac5 src/share/vm/prims/jvmtiEnv.cpp
+--- a/src/share/vm/prims/jvmtiEnv.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/prims/jvmtiEnv.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -290,7 +290,10 @@
+ class_definitions[index].klass = jcls;
+ }
+ VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
+- VMThread::execute(&op);
++ {
++ MutexLocker sd_mutex(RedefineClasses_lock);
++ VMThread::execute(&op);
++ }
+ return (op.check_error());
+ } /* end RetransformClasses */
+
+@@ -299,9 +302,12 @@
+ // class_definitions - pre-checked for NULL
+ jvmtiError
+ JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) {
+-//TODO: add locking
++
+ VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
+- VMThread::execute(&op);
++ {
++ MutexLocker sd_mutex(RedefineClasses_lock);
++ VMThread::execute(&op);
++ }
+ return (op.check_error());
+ } /* end RedefineClasses */
+
+diff -r 882f6c762ac5 src/share/vm/prims/jvmtiExport.cpp
+--- a/src/share/vm/prims/jvmtiExport.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/prims/jvmtiExport.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -2296,7 +2296,7 @@
+ // iterate over any code blob descriptors collected and post a
+ // DYNAMIC_CODE_GENERATED event to the profiler.
+ JvmtiDynamicCodeEventCollector::~JvmtiDynamicCodeEventCollector() {
+- assert(!JavaThread::current()->owns_locks(), "all locks must be released to post deferred events");
++ assert(!JavaThread::current()->owns_locks_but_redefine_classes_lock(), "all locks must be released to post deferred events");
+ // iterate over any code blob descriptors that we collected
+ if (_code_blobs != NULL) {
+ for (int i=0; i<_code_blobs->length(); i++) {
+diff -r 882f6c762ac5 src/share/vm/prims/jvmtiImpl.cpp
+--- a/src/share/vm/prims/jvmtiImpl.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/prims/jvmtiImpl.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -286,6 +286,8 @@
+ void JvmtiBreakpoint::each_method_version_do(method_action meth_act) {
+ ((methodOopDesc*)_method->*meth_act)(_bci);
+
++ // DCEVM: TODO: Check how we can implement this differently here!
++
+ // add/remove breakpoint to/from versions of the method that
+ // are EMCP. Directly or transitively obsolete methods are
+ // not saved in the PreviousVersionInfo.
+diff -r 882f6c762ac5 src/share/vm/prims/jvmtiRedefineClasses.cpp
+--- a/src/share/vm/prims/jvmtiRedefineClasses.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/prims/jvmtiRedefineClasses.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -1,5 +1,5 @@
+ /*
+- * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
++ * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+@@ -30,581 +30,637 @@
+ #include "interpreter/rewriter.hpp"
+ #include "memory/gcLocker.hpp"
+ #include "memory/universe.inline.hpp"
++#include "memory/cardTableRS.hpp"
++#include "oops/klassVtable.hpp"
+ #include "oops/fieldStreams.hpp"
+-#include "oops/klassVtable.hpp"
+ #include "prims/jvmtiImpl.hpp"
+ #include "prims/jvmtiRedefineClasses.hpp"
++#include "prims/jvmtiClassFileReconstituter.hpp"
+ #include "prims/methodComparator.hpp"
+-#include "prims/methodHandles.hpp"
+ #include "runtime/deoptimization.hpp"
+ #include "runtime/relocator.hpp"
+ #include "utilities/bitMap.inline.hpp"
++#include "compiler/compileBroker.hpp"
+
+
+ objArrayOop VM_RedefineClasses::_old_methods = NULL;
+ objArrayOop VM_RedefineClasses::_new_methods = NULL;
+-methodOop* VM_RedefineClasses::_matching_old_methods = NULL;
+-methodOop* VM_RedefineClasses::_matching_new_methods = NULL;
+-methodOop* VM_RedefineClasses::_deleted_methods = NULL;
+-methodOop* VM_RedefineClasses::_added_methods = NULL;
++int* VM_RedefineClasses::_matching_old_methods = NULL;
++int* VM_RedefineClasses::_matching_new_methods = NULL;
++int* VM_RedefineClasses::_deleted_methods = NULL;
++int* VM_RedefineClasses::_added_methods = NULL;
+ int VM_RedefineClasses::_matching_methods_length = 0;
+ int VM_RedefineClasses::_deleted_methods_length = 0;
+ int VM_RedefineClasses::_added_methods_length = 0;
+ klassOop VM_RedefineClasses::_the_class_oop = NULL;
+
+-
+-VM_RedefineClasses::VM_RedefineClasses(jint class_count,
+- const jvmtiClassDefinition *class_defs,
+- JvmtiClassLoadKind class_load_kind) {
++// Holds the revision number of the current class redefinition
++int VM_RedefineClasses::_revision_number = -1;
++
++VM_RedefineClasses::VM_RedefineClasses(jint class_count, const jvmtiClassDefinition *class_defs, JvmtiClassLoadKind class_load_kind)
++ : VM_GC_Operation(Universe::heap()->total_full_collections(), GCCause::_jvmti_force_gc) {
++ RC_TIMER_START(_timer_total);
+ _class_count = class_count;
+ _class_defs = class_defs;
+ _class_load_kind = class_load_kind;
+- _res = JVMTI_ERROR_NONE;
++ _updated_oops = NULL;
++ _result = JVMTI_ERROR_NONE;
+ }
+
++VM_RedefineClasses::~VM_RedefineClasses() {
++ {
++ MonitorLockerEx ml(RedefinitionSync_lock);
++ Threads::set_wait_at_instrumentation_entry(false);
++ ml.notify_all();
++ }
++
++ unlock_threads();
++ RC_TIMER_STOP(_timer_total);
++
++ if (TimeRedefineClasses) {
++ tty->print_cr("Timing Prologue: %d", _timer_prologue.milliseconds());
++ tty->print_cr("Timing Class Loading: %d", _timer_class_loading.milliseconds());
++ tty->print_cr("Timing Waiting for Lock: %d", _timer_wait_for_locks.milliseconds());
++ tty->print_cr("Timing Class Linking: %d", _timer_class_linking.milliseconds());
++ tty->print_cr("Timing Check Type: %d", _timer_check_type.milliseconds());
++ tty->print_cr("Timing Prepare Redefinition: %d", _timer_prepare_redefinition.milliseconds());
++ tty->print_cr("Timing Redefinition GC: %d", _timer_redefinition.milliseconds());
++ tty->print_cr("Timing Epilogue: %d", _timer_vm_op_epilogue.milliseconds());
++ tty->print_cr("------------------------------------------------------------------");
++ tty->print_cr("Total Time: %d", _timer_total.milliseconds());
++ }
++}
++
++// Searches for all affected classes and performs a sorting such that a supertype is always before a subtype.
++jvmtiError VM_RedefineClasses::find_sorted_affected_classes(GrowableArray<instanceKlassHandle> *all_affected_klasses) {
++
++ // Create array with all classes for which the redefine command was given
++ GrowableArray<instanceKlassHandle> klasses_to_redefine;
++ for (int i=0; i<_class_count; i++) {
++ oop mirror = JNIHandles::resolve_non_null(_class_defs[i].klass);
++ instanceKlassHandle klass_handle(Thread::current(), java_lang_Class::as_klassOop(mirror));
++ klasses_to_redefine.append(klass_handle);
++ assert(klass_handle->new_version() == NULL, "Must be new class");
++ }
++
++ // Find classes not directly redefined, but affected by a redefinition (because one of its supertypes is redefined)
++ GrowableArray<instanceKlassHandle> affected_classes;
++ FindAffectedKlassesClosure closure(&klasses_to_redefine, &affected_classes);
++
++ // Trace affected classes
++ if (RC_TRACE_ENABLED(0x00000001)) {
++ RC_TRACE(0x00000001, ("Klasses affected: %d",
++ affected_classes.length()));
++ for (int i=0; i<affected_classes.length(); i++) {
++ RC_TRACE(0x00000001, ("%s",
++ affected_classes.at(i)->name()->as_C_string()));
++ }
++ }
++
++ // Add the array of affected classes and the array of redefined classes to get a list of all classes that need a redefinition
++ all_affected_klasses->appendAll(&klasses_to_redefine);
++ all_affected_klasses->appendAll(&affected_classes);
++
++ // Sort the affected klasses such that a supertype is always on a smaller array index than its subtype.
++ jvmtiError result = do_topological_class_sorting(_class_defs, _class_count, &affected_classes, all_affected_klasses, Thread::current());
++ if (RC_TRACE_ENABLED(0x00000001)) {
++ RC_TRACE(0x00000001, ("Redefine order: "));
++ for (int i=0; i<all_affected_klasses->length(); i++) {
++ RC_TRACE(0x00000001, ("%s",
++ all_affected_klasses->at(i)->name()->as_C_string()));
++ }
++ }
++
++ return result;
++}
++
++// Searches for the class bytes of the given class and returns them as a byte array.
++jvmtiError VM_RedefineClasses::find_class_bytes(instanceKlassHandle the_class, const unsigned char **class_bytes, jint *class_byte_count, jboolean *not_changed) {
++
++ *not_changed = false;
++
++ // Search for the index in the redefinition array that corresponds to the current class
++ int j;
++ for (j=0; j<_class_count; j++) {
++ oop mirror = JNIHandles::resolve_non_null(_class_defs[j].klass);
++ klassOop the_class_oop = java_lang_Class::as_klassOop(mirror);
++ if (the_class_oop == the_class()) {
++ break;
++ }
++ }
++
++ if (j == _class_count) {
++
++ *not_changed = true;
++
++ // Redefine with same bytecodes. This is a class that is only indirectly affected by redefinition,
++ // so the user did not specify a different bytecode for that class.
++
++ if (the_class->get_cached_class_file_bytes() == NULL) {
++ // not cached, we need to reconstitute the class file from VM representation
++ constantPoolHandle constants(Thread::current(), the_class->constants());
++ ObjectLocker ol(constants, Thread::current()); // lock constant pool while we query it
++
++ JvmtiClassFileReconstituter reconstituter(the_class);
++ if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
++ return reconstituter.get_error();
++ }
++
++ *class_byte_count = (jint)reconstituter.class_file_size();
++ *class_bytes = (unsigned char*)reconstituter.class_file_bytes();
++
++ } else {
++
++ // it is cached, get it from the cache
++ *class_byte_count = the_class->get_cached_class_file_len();
++ *class_bytes = the_class->get_cached_class_file_bytes();
++ }
++
++ } else {
++
++ // Redefine with bytecodes at index j
++ *class_bytes = _class_defs[j].class_bytes;
++ *class_byte_count = _class_defs[j].class_byte_count;
++ }
++
++ return JVMTI_ERROR_NONE;
++}
++
++// Prologue of the VM operation, called on the Java thread in parallel to normal program execution
+ bool VM_RedefineClasses::doit_prologue() {
+- if (_class_count == 0) {
+- _res = JVMTI_ERROR_NONE;
++
++ _revision_number++;
++ RC_TRACE(0x00000001, ("Redefinition with revision number %d started!", _revision_number));
++
++ assert(Thread::current()->is_Java_thread(), "must be Java thread");
++ RC_TIMER_START(_timer_prologue);
++
++ if (!check_arguments()) {
++ RC_TIMER_STOP(_timer_prologue);
+ return false;
+ }
+- if (_class_defs == NULL) {
+- _res = JVMTI_ERROR_NULL_POINTER;
++
++ // We first load new class versions in the prologue, because somewhere down the
++ // call chain it is required that the current thread is a Java thread.
++ _new_classes = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<instanceKlassHandle>(5, true);
++ _result = load_new_class_versions(Thread::current());
++
++ RC_TRACE(0x00000001, ("Loaded new class versions!"));
++ if (_result != JVMTI_ERROR_NONE) {
++ RC_TRACE(0x00000001, ("error occured: %d!", _result));
++ delete _new_classes;
++ _new_classes = NULL;
++ RC_TIMER_STOP(_timer_prologue);
+ return false;
+ }
++
++ RC_TRACE(0x00000001, ("nearly finished"));
++ VM_GC_Operation::doit_prologue();
++ RC_TIMER_STOP(_timer_prologue);
++ RC_TRACE(0x00000001, ("doit_prologue finished!"));
++ return true;
++}
++
++// Checks basic properties of the arguments of the redefinition command.
++bool VM_RedefineClasses::check_arguments() {
++
++ if (_class_count == 0) RC_ABORT(JVMTI_ERROR_NONE);
++ if (_class_defs == NULL) RC_ABORT(JVMTI_ERROR_NULL_POINTER);
+ for (int i = 0; i < _class_count; i++) {
+- if (_class_defs[i].klass == NULL) {
+- _res = JVMTI_ERROR_INVALID_CLASS;
+- return false;
++ if (_class_defs[i].klass == NULL) RC_ABORT(JVMTI_ERROR_INVALID_CLASS);
++ if (_class_defs[i].class_byte_count == 0) RC_ABORT(JVMTI_ERROR_INVALID_CLASS_FORMAT);
++ if (_class_defs[i].class_bytes == NULL) RC_ABORT(JVMTI_ERROR_NULL_POINTER);
++ }
++
++ return true;
++}
++
++jvmtiError VM_RedefineClasses::check_exception() const {
++ Thread* THREAD = Thread::current();
++ if (HAS_PENDING_EXCEPTION) {
++
++ Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
++ RC_TRACE(0x00000001, ("parse_stream exception: '%s'",
++ ex_name->as_C_string()));
++ if (TraceRedefineClasses >= 1) {
++ java_lang_Throwable::print(PENDING_EXCEPTION, tty);
++ tty->print_cr("");
+ }
+- if (_class_defs[i].class_byte_count == 0) {
+- _res = JVMTI_ERROR_INVALID_CLASS_FORMAT;
+- return false;
+- }
+- if (_class_defs[i].class_bytes == NULL) {
+- _res = JVMTI_ERROR_NULL_POINTER;
+- return false;
++ CLEAR_PENDING_EXCEPTION;
++
++ if (ex_name == vmSymbols::java_lang_UnsupportedClassVersionError()) {
++ return JVMTI_ERROR_UNSUPPORTED_VERSION;
++ } else if (ex_name == vmSymbols::java_lang_ClassFormatError()) {
++ return JVMTI_ERROR_INVALID_CLASS_FORMAT;
++ } else if (ex_name == vmSymbols::java_lang_ClassCircularityError()) {
++ return JVMTI_ERROR_CIRCULAR_CLASS_DEFINITION;
++ } else if (ex_name == vmSymbols::java_lang_NoClassDefFoundError()) {
++ // The message will be "XXX (wrong name: YYY)"
++ return JVMTI_ERROR_NAMES_DONT_MATCH;
++ } else if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) {
++ return JVMTI_ERROR_OUT_OF_MEMORY;
++ } else {
++ // Just in case more exceptions can be thrown..
++ return JVMTI_ERROR_FAILS_VERIFICATION;
+ }
+ }
+
+- // Start timer after all the sanity checks; not quite accurate, but
+- // better than adding a bunch of stop() calls.
+- RC_TIMER_START(_timer_vm_op_prologue);
+-
+- // We first load new class versions in the prologue, because somewhere down the
+- // call chain it is required that the current thread is a Java thread.
+- _res = load_new_class_versions(Thread::current());
+- if (_res != JVMTI_ERROR_NONE) {
+- // Free os::malloc allocated memory in load_new_class_version.
+- os::free(_scratch_classes);
+- RC_TIMER_STOP(_timer_vm_op_prologue);
+- return false;
++ return JVMTI_ERROR_NONE;
++}
++
++// Loads all new class versions and stores the instanceKlass handles in an array.
++jvmtiError VM_RedefineClasses::load_new_class_versions(TRAPS) {
++
++ ResourceMark rm(THREAD);
++
++ RC_TRACE(0x00000001, ("==================================================================="));
++ RC_TRACE(0x00000001, ("load new class versions (%d)",
++ _class_count));
++
++ // Retrieve an array of all classes that need to be redefined
++ GrowableArray<instanceKlassHandle> all_affected_klasses;
++ jvmtiError err = find_sorted_affected_classes(&all_affected_klasses);
++ if (err != JVMTI_ERROR_NONE) {
++ RC_TRACE(0x00000001, ("Error finding sorted affected classes: %d",
++ (int)err));
++ return err;
+ }
+
+- RC_TIMER_STOP(_timer_vm_op_prologue);
+- return true;
+-}
+-
+-void VM_RedefineClasses::doit() {
+- Thread *thread = Thread::current();
+-
+- if (UseSharedSpaces) {
+- // Sharing is enabled so we remap the shared readonly space to
+- // shared readwrite, private just in case we need to redefine
+- // a shared class. We do the remap during the doit() phase of
+- // the safepoint to be safer.
+- if (!CompactingPermGenGen::remap_shared_readonly_as_readwrite()) {
+- RC_TRACE_WITH_THREAD(0x00000001, thread,
+- ("failed to remap shared readonly space to readwrite, private"));
+- _res = JVMTI_ERROR_INTERNAL;
+- return;
++
++ JvmtiThreadState *state = JvmtiThreadState::state_for(JavaThread::current());
++
++ _max_redefinition_flags = Klass::NoRedefinition;
++ jvmtiError result = JVMTI_ERROR_NONE;
++
++ for (int i=0; i<all_affected_klasses.length(); i++) {
++ RC_TRACE(0x00000002, ("Processing affected class %d of %d",
++ i+1, all_affected_klasses.length()));
++
++ instanceKlassHandle the_class = all_affected_klasses.at(i);
++ RC_TRACE(0x00000002, ("name=%s",
++ the_class->name()->as_C_string()));
++
++ the_class->link_class(THREAD);
++ result = check_exception();
++ if (result != JVMTI_ERROR_NONE) break;
++
++ // Find new class bytes
++ const unsigned char* class_bytes;
++ jint class_byte_count;
++ jvmtiError error;
++ jboolean not_changed;
++ if ((error = find_class_bytes(the_class, &class_bytes, &class_byte_count, ¬_changed)) != JVMTI_ERROR_NONE) {
++ RC_TRACE(0x00000001, ("Error finding class bytes: %d",
++ (int)error));
++ result = error;
++ break;
+ }
+- }
+-
+- for (int i = 0; i < _class_count; i++) {
+- redefine_single_class(_class_defs[i].klass, _scratch_classes[i], thread);
+- }
+- // Disable any dependent concurrent compilations
+- SystemDictionary::notice_modification();
+-
+- // Set flag indicating that some invariants are no longer true.
+- // See jvmtiExport.hpp for detailed explanation.
+- JvmtiExport::set_has_redefined_a_class();
+-
+-// check_class() is optionally called for product bits, but is
+-// always called for non-product bits.
+-#ifdef PRODUCT
+- if (RC_TRACE_ENABLED(0x00004000)) {
++ assert(class_bytes != NULL && class_byte_count != 0, "Class bytes defined at this point!");
++
++
++ // Set redefined class handle in JvmtiThreadState class.
++ // This redefined class is sent to agent event handler for class file
++ // load hook event.
++ state->set_class_being_redefined(&the_class, _class_load_kind);
++
++ RC_TRACE(0x00000002, ("Before resolving from stream"));
++
++ RC_TIMER_STOP(_timer_prologue);
++ RC_TIMER_START(_timer_class_loading);
++
++
++ // Parse the stream.
++ Handle the_class_loader(THREAD, the_class->class_loader());
++ Handle protection_domain(THREAD, the_class->protection_domain());
++ Symbol* the_class_sym = the_class->name();
++ ClassFileStream st((u1*) class_bytes, class_byte_count, (char *)"__VM_RedefineClasses__");
++ instanceKlassHandle new_class(THREAD, SystemDictionary::resolve_from_stream(the_class_sym,
++ the_class_loader,
++ protection_domain,
++ &st,
++ true,
++ the_class,
++ THREAD));
++
++ not_changed = false;
++
++ RC_TIMER_STOP(_timer_class_loading);
++ RC_TIMER_START(_timer_prologue);
++
++ RC_TRACE(0x00000002, ("After resolving class from stream!"));
++ // Clear class_being_redefined just to be sure.
++ state->clear_class_being_redefined();
++
++ result = check_exception();
++ if (result != JVMTI_ERROR_NONE) break;
++
++#ifdef ASSERT
++
++ assert(new_class() != NULL, "Class could not be loaded!");
++ assert(new_class() != the_class(), "must be different");
++ assert(new_class->new_version() == NULL && new_class->old_version() != NULL, "");
++
++
++ objArrayOop k_interfaces = new_class->local_interfaces();
++ for (int j=0; j<k_interfaces->length(); j++) {
++ assert(((klassOop)k_interfaces->obj_at(j))->klass_part()->is_newest_version(), "just checking");
++ }
++
++ if (!THREAD->is_Compiler_thread()) {
++
++ RC_TRACE(0x00000002, ("name=%s loader="INTPTR_FORMAT" protection_domain="INTPTR_FORMAT" ",
++ the_class->name()->as_C_string(),
++ (address)(the_class->class_loader()),
++ (address)(the_class->protection_domain())));
++ // If we are on the compiler thread, we must not try to resolve a class.
++ klassOop systemLookup = SystemDictionary::resolve_or_null(the_class->name(), the_class->class_loader(), the_class->protection_domain(), THREAD);
++
++ if (systemLookup != NULL) {
++ assert(systemLookup == new_class->old_version(), "Old class must be in system dictionary!");
++
++
++ Klass *subklass = new_class()->klass_part()->subklass();
++ while (subklass != NULL) {
++ assert(subklass->new_version() == NULL, "Most recent version of class!");
++ subklass = subklass->next_sibling();
++ }
++ } else {
++ // This can happen for reflection generated classes.. ?
++ CLEAR_PENDING_EXCEPTION;
++ }
++ }
++
+ #endif
+- RC_TRACE_WITH_THREAD(0x00004000, thread, ("calling check_class"));
+- SystemDictionary::classes_do(check_class, thread);
+-#ifdef PRODUCT
+- }
+-#endif
+-}
+-
+-void VM_RedefineClasses::doit_epilogue() {
+- // Free os::malloc allocated memory.
+- // The memory allocated in redefine will be free'ed in next VM operation.
+- os::free(_scratch_classes);
+-
+- if (RC_TRACE_ENABLED(0x00000004)) {
+- // Used to have separate timers for "doit" and "all", but the timer
+- // overhead skewed the measurements.
+- jlong doit_time = _timer_rsc_phase1.milliseconds() +
+- _timer_rsc_phase2.milliseconds();
+- jlong all_time = _timer_vm_op_prologue.milliseconds() + doit_time;
+-
+- RC_TRACE(0x00000004, ("vm_op: all=" UINT64_FORMAT
+- " prologue=" UINT64_FORMAT " doit=" UINT64_FORMAT, all_time,
+- _timer_vm_op_prologue.milliseconds(), doit_time));
+- RC_TRACE(0x00000004,
+- ("redefine_single_class: phase1=" UINT64_FORMAT " phase2=" UINT64_FORMAT,
+- _timer_rsc_phase1.milliseconds(), _timer_rsc_phase2.milliseconds()));
+- }
+-}
+-
+-bool VM_RedefineClasses::is_modifiable_class(oop klass_mirror) {
+- // classes for primitives cannot be redefined
+- if (java_lang_Class::is_primitive(klass_mirror)) {
+- return false;
+- }
+- klassOop the_class_oop = java_lang_Class::as_klassOop(klass_mirror);
+- // classes for arrays cannot be redefined
+- if (the_class_oop == NULL || !Klass::cast(the_class_oop)->oop_is_instance()) {
+- return false;
+- }
+- return true;
+-}
+-
+-// Append the current entry at scratch_i in scratch_cp to *merge_cp_p
+-// where the end of *merge_cp_p is specified by *merge_cp_length_p. For
+-// direct CP entries, there is just the current entry to append. For
+-// indirect and double-indirect CP entries, there are zero or more
+-// referenced CP entries along with the current entry to append.
+-// Indirect and double-indirect CP entries are handled by recursive
+-// calls to append_entry() as needed. The referenced CP entries are
+-// always appended to *merge_cp_p before the referee CP entry. These
+-// referenced CP entries may already exist in *merge_cp_p in which case
+-// there is nothing extra to append and only the current entry is
+-// appended.
+-void VM_RedefineClasses::append_entry(constantPoolHandle scratch_cp,
+- int scratch_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p,
+- TRAPS) {
+-
+- // append is different depending on entry tag type
+- switch (scratch_cp->tag_at(scratch_i).value()) {
+-
+- // The old verifier is implemented outside the VM. It loads classes,
+- // but does not resolve constant pool entries directly so we never
+- // see Class entries here with the old verifier. Similarly the old
+- // verifier does not like Class entries in the input constant pool.
+- // The split-verifier is implemented in the VM so it can optionally
+- // and directly resolve constant pool entries to load classes. The
+- // split-verifier can accept either Class entries or UnresolvedClass
+- // entries in the input constant pool. We revert the appended copy
+- // back to UnresolvedClass so that either verifier will be happy
+- // with the constant pool entry.
+- case JVM_CONSTANT_Class:
+- {
+- // revert the copy to JVM_CONSTANT_UnresolvedClass
+- (*merge_cp_p)->unresolved_klass_at_put(*merge_cp_length_p,
+- scratch_cp->klass_name_at(scratch_i));
+-
+- if (scratch_i != *merge_cp_length_p) {
+- // The new entry in *merge_cp_p is at a different index than
+- // the new entry in scratch_cp so we need to map the index values.
+- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
++
++ if (RC_TRACE_ENABLED(0x00000001)) {
++ if (new_class->layout_helper() != the_class->layout_helper()) {
++ RC_TRACE(0x00000001, ("Instance size change for class %s: new=%d old=%d",
++ new_class->name()->as_C_string(),
++ new_class->layout_helper(),
++ the_class->layout_helper()));
+ }
+- (*merge_cp_length_p)++;
+- } break;
+-
+- // these are direct CP entries so they can be directly appended,
+- // but double and long take two constant pool entries
+- case JVM_CONSTANT_Double: // fall through
+- case JVM_CONSTANT_Long:
+- {
+- constantPoolOopDesc::copy_entry_to(scratch_cp, scratch_i, *merge_cp_p, *merge_cp_length_p,
+- THREAD);
+-
+- if (scratch_i != *merge_cp_length_p) {
+- // The new entry in *merge_cp_p is at a different index than
+- // the new entry in scratch_cp so we need to map the index values.
+- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
+- }
+- (*merge_cp_length_p) += 2;
+- } break;
+-
+- // these are direct CP entries so they can be directly appended
+- case JVM_CONSTANT_Float: // fall through
+- case JVM_CONSTANT_Integer: // fall through
+- case JVM_CONSTANT_Utf8: // fall through
+-
+- // This was an indirect CP entry, but it has been changed into
+- // an interned string so this entry can be directly appended.
+- case JVM_CONSTANT_String: // fall through
+-
+- // These were indirect CP entries, but they have been changed into
+- // Symbol*s so these entries can be directly appended.
+- case JVM_CONSTANT_UnresolvedClass: // fall through
+- case JVM_CONSTANT_UnresolvedString:
+- {
+- constantPoolOopDesc::copy_entry_to(scratch_cp, scratch_i, *merge_cp_p, *merge_cp_length_p,
+- THREAD);
+-
+- if (scratch_i != *merge_cp_length_p) {
+- // The new entry in *merge_cp_p is at a different index than
+- // the new entry in scratch_cp so we need to map the index values.
+- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
+- }
+- (*merge_cp_length_p)++;
+- } break;
+-
+- // this is an indirect CP entry so it needs special handling
+- case JVM_CONSTANT_NameAndType:
+- {
+- int name_ref_i = scratch_cp->name_ref_index_at(scratch_i);
+- int new_name_ref_i = find_or_append_indirect_entry(scratch_cp, name_ref_i, merge_cp_p,
+- merge_cp_length_p, THREAD);
+-
+- int signature_ref_i = scratch_cp->signature_ref_index_at(scratch_i);
+- int new_signature_ref_i = find_or_append_indirect_entry(scratch_cp, signature_ref_i,
+- merge_cp_p, merge_cp_length_p,
+- THREAD);
+-
+- // If the referenced entries already exist in *merge_cp_p, then
+- // both new_name_ref_i and new_signature_ref_i will both be 0.
+- // In that case, all we are appending is the current entry.
+- if (new_name_ref_i != name_ref_i) {
+- RC_TRACE(0x00080000,
+- ("NameAndType entry@%d name_ref_index change: %d to %d",
+- *merge_cp_length_p, name_ref_i, new_name_ref_i));
+- }
+- if (new_signature_ref_i != signature_ref_i) {
+- RC_TRACE(0x00080000,
+- ("NameAndType entry@%d signature_ref_index change: %d to %d",
+- *merge_cp_length_p, signature_ref_i, new_signature_ref_i));
+- }
+-
+- (*merge_cp_p)->name_and_type_at_put(*merge_cp_length_p,
+- new_name_ref_i, new_signature_ref_i);
+- if (scratch_i != *merge_cp_length_p) {
+- // The new entry in *merge_cp_p is at a different index than
+- // the new entry in scratch_cp so we need to map the index values.
+- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
+- }
+- (*merge_cp_length_p)++;
+- } break;
+-
+- // this is a double-indirect CP entry so it needs special handling
+- case JVM_CONSTANT_Fieldref: // fall through
+- case JVM_CONSTANT_InterfaceMethodref: // fall through
+- case JVM_CONSTANT_Methodref:
+- {
+- int klass_ref_i = scratch_cp->uncached_klass_ref_index_at(scratch_i);
+- int new_klass_ref_i = find_or_append_indirect_entry(scratch_cp, klass_ref_i,
+- merge_cp_p, merge_cp_length_p, THREAD);
+- int name_and_type_ref_i = scratch_cp->uncached_name_and_type_ref_index_at(scratch_i);
+- int new_name_and_type_ref_i = find_or_append_indirect_entry(scratch_cp, name_and_type_ref_i,
+- merge_cp_p, merge_cp_length_p, THREAD);
+-
+- const char *entry_name;
+- switch (scratch_cp->tag_at(scratch_i).value()) {
+- case JVM_CONSTANT_Fieldref:
+- entry_name = "Fieldref";
+- (*merge_cp_p)->field_at_put(*merge_cp_length_p, new_klass_ref_i,
+- new_name_and_type_ref_i);
+- break;
+- case JVM_CONSTANT_InterfaceMethodref:
+- entry_name = "IFMethodref";
+- (*merge_cp_p)->interface_method_at_put(*merge_cp_length_p,
+- new_klass_ref_i, new_name_and_type_ref_i);
+- break;
+- case JVM_CONSTANT_Methodref:
+- entry_name = "Methodref";
+- (*merge_cp_p)->method_at_put(*merge_cp_length_p, new_klass_ref_i,
+- new_name_and_type_ref_i);
+- break;
+- default:
+- guarantee(false, "bad switch");
++ }
++
++ // Set the new version of the class
++ new_class->set_revision_number(_revision_number);
++ new_class->set_redefinition_index(i);
++ the_class->set_new_version(new_class());
++ _new_classes->append(new_class);
++
++ assert(new_class->new_version() == NULL, "");
++
++ int redefinition_flags = Klass::NoRedefinition;
++
++ if (not_changed) {
++ redefinition_flags = Klass::NoRedefinition;
++ } else if (AllowAdvancedClassRedefinition) {
++ redefinition_flags = calculate_redefinition_flags(new_class);
++ } else {
++ jvmtiError allowed = check_redefinition_allowed(new_class);
++ if (allowed != JVMTI_ERROR_NONE) {
++ RC_TRACE(0x00000001, ("Error redefinition not allowed!"));
++ result = allowed;
+ break;
+ }
+-
+- if (klass_ref_i != new_klass_ref_i) {
+- RC_TRACE(0x00080000, ("%s entry@%d class_index changed: %d to %d",
+- entry_name, *merge_cp_length_p, klass_ref_i, new_klass_ref_i));
++ redefinition_flags = Klass::ModifyClass;
++ }
++
++ if (new_class->super() != NULL) {
++ redefinition_flags = redefinition_flags | new_class->super()->klass_part()->redefinition_flags();
++ }
++
++ for (int j=0; j<new_class->local_interfaces()->length(); j++) {
++ redefinition_flags = redefinition_flags | ((klassOop)new_class->local_interfaces()->obj_at(j))->klass_part()->redefinition_flags();
++ }
++
++ new_class->set_redefinition_flags(redefinition_flags);
++
++ _max_redefinition_flags = _max_redefinition_flags | redefinition_flags;
++
++ if ((redefinition_flags & Klass::ModifyInstances) != 0) {
++ // TODO: Check if watch access flags of static fields are updated correctly.
++ calculate_instance_update_information(_new_classes->at(i)());
++ } else {
++ assert(new_class->layout_helper() >> 1 == new_class->old_version()->klass_part()->layout_helper() >> 1, "must be equal");
++ assert(new_class->fields()->length() == ((instanceKlass*)new_class->old_version()->klass_part())->fields()->length(), "must be equal");
++
++ fieldDescriptor fd_new;
++ fieldDescriptor fd_old;
++ for (JavaFieldStream fs(new_class); !fs.done(); fs.next()) {
++ fd_new.initialize(new_class(), fs.index());
++ fd_old.initialize(new_class->old_version(), fs.index());
++ transfer_special_access_flags(&fd_old, &fd_new);
+ }
+- if (name_and_type_ref_i != new_name_and_type_ref_i) {
+- RC_TRACE(0x00080000,
+- ("%s entry@%d name_and_type_index changed: %d to %d",
+- entry_name, *merge_cp_length_p, name_and_type_ref_i,
+- new_name_and_type_ref_i));
++ }
++
++ if (RC_TRACE_ENABLED(0x00000008)) {
++ if (new_class->super() != NULL) {
++ RC_TRACE(0x00000008, ("Super class is %s",
++ new_class->super()->klass_part()->name()->as_C_string()));
+ }
+-
+- if (scratch_i != *merge_cp_length_p) {
+- // The new entry in *merge_cp_p is at a different index than
+- // the new entry in scratch_cp so we need to map the index values.
+- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
++ }
++
++#ifdef ASSERT
++ assert(new_class->super() == NULL || new_class->super()->klass_part()->new_version() == NULL, "Super klass must be newest version!");
++
++ the_class->vtable()->verify(tty);
++ new_class->vtable()->verify(tty);
++#endif
++
++ RC_TRACE(0x00000002, ("Verification done!"));
++
++ if (i == all_affected_klasses.length() - 1) {
++
++ // This was the last class processed => check if additional classes have been loaded in the meantime
++
++ RC_TIMER_STOP(_timer_prologue);
++ lock_threads();
++ RC_TIMER_START(_timer_prologue);
++
++ for (int j=0; j<all_affected_klasses.length(); j++) {
++
++ klassOop initial_klass = all_affected_klasses.at(j)();
++ Klass *initial_subklass = initial_klass->klass_part()->subklass();
++ Klass *cur_klass = initial_subklass;
++ while(cur_klass != NULL) {
++
++ if(cur_klass->oop_is_instance() && cur_klass->is_newest_version()) {
++ instanceKlassHandle handle(THREAD, cur_klass->as_klassOop());
++ if (!all_affected_klasses.contains(handle)) {
++
++ int k = i + 1;
++ for (; k<all_affected_klasses.length(); k++) {
++ if (all_affected_klasses.at(k)->is_subtype_of(cur_klass->as_klassOop())) {
++ break;
++ }
++ }
++ all_affected_klasses.insert_before(k, handle);
++ RC_TRACE(0x00000002, ("Adding newly loaded class to affected classes: %s",
++ cur_klass->name()->as_C_string()));
++ }
++ }
++
++ cur_klass = cur_klass->next_sibling();
++ }
+ }
+- (*merge_cp_length_p)++;
+- } break;
+-
+- // this is an indirect CP entry so it needs special handling
+- case JVM_CONSTANT_MethodType:
+- {
+- int ref_i = scratch_cp->method_type_index_at(scratch_i);
+- int new_ref_i = find_or_append_indirect_entry(scratch_cp, ref_i, merge_cp_p,
+- merge_cp_length_p, THREAD);
+- if (new_ref_i != ref_i) {
+- RC_TRACE(0x00080000,
+- ("MethodType entry@%d ref_index change: %d to %d",
+- *merge_cp_length_p, ref_i, new_ref_i));
+- }
+- (*merge_cp_p)->method_type_index_at_put(*merge_cp_length_p, new_ref_i);
+- if (scratch_i != *merge_cp_length_p) {
+- // The new entry in *merge_cp_p is at a different index than
+- // the new entry in scratch_cp so we need to map the index values.
+- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
+- }
+- (*merge_cp_length_p)++;
+- } break;
+-
+- // this is an indirect CP entry so it needs special handling
+- case JVM_CONSTANT_MethodHandle:
+- {
+- int ref_kind = scratch_cp->method_handle_ref_kind_at(scratch_i);
+- int ref_i = scratch_cp->method_handle_index_at(scratch_i);
+- int new_ref_i = find_or_append_indirect_entry(scratch_cp, ref_i, merge_cp_p,
+- merge_cp_length_p, THREAD);
+- if (new_ref_i != ref_i) {
+- RC_TRACE(0x00080000,
+- ("MethodHandle entry@%d ref_index change: %d to %d",
+- *merge_cp_length_p, ref_i, new_ref_i));
+- }
+- (*merge_cp_p)->method_handle_index_at_put(*merge_cp_length_p, ref_kind, new_ref_i);
+- if (scratch_i != *merge_cp_length_p) {
+- // The new entry in *merge_cp_p is at a different index than
+- // the new entry in scratch_cp so we need to map the index values.
+- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
+- }
+- (*merge_cp_length_p)++;
+- } break;
+-
+- // this is an indirect CP entry so it needs special handling
+- case JVM_CONSTANT_InvokeDynamic:
+- {
+- // Index of the bootstrap specifier in the operands array
+- int old_bs_i = scratch_cp->invoke_dynamic_bootstrap_specifier_index(scratch_i);
+- int new_bs_i = find_or_append_operand(scratch_cp, old_bs_i, merge_cp_p,
+- merge_cp_length_p, THREAD);
+- // The bootstrap method NameAndType_info index
+- int old_ref_i = scratch_cp->invoke_dynamic_name_and_type_ref_index_at(scratch_i);
+- int new_ref_i = find_or_append_indirect_entry(scratch_cp, old_ref_i, merge_cp_p,
+- merge_cp_length_p, THREAD);
+- if (new_bs_i != old_bs_i) {
+- RC_TRACE(0x00080000,
+- ("InvokeDynamic entry@%d bootstrap_method_attr_index change: %d to %d",
+- *merge_cp_length_p, old_bs_i, new_bs_i));
+- }
+- if (new_ref_i != old_ref_i) {
+- RC_TRACE(0x00080000,
+- ("InvokeDynamic entry@%d name_and_type_index change: %d to %d",
+- *merge_cp_length_p, old_ref_i, new_ref_i));
+- }
+-
+- (*merge_cp_p)->invoke_dynamic_at_put(*merge_cp_length_p, new_bs_i, new_ref_i);
+- if (scratch_i != *merge_cp_length_p) {
+- // The new entry in *merge_cp_p is at a different index than
+- // the new entry in scratch_cp so we need to map the index values.
+- map_index(scratch_cp, scratch_i, *merge_cp_length_p);
+- }
+- (*merge_cp_length_p)++;
+- } break;
+-
+- // At this stage, Class or UnresolvedClass could be here, but not
+- // ClassIndex
+- case JVM_CONSTANT_ClassIndex: // fall through
+-
+- // Invalid is used as the tag for the second constant pool entry
+- // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
+- // not be seen by itself.
+- case JVM_CONSTANT_Invalid: // fall through
+-
+- // At this stage, String or UnresolvedString could be here, but not
+- // StringIndex
+- case JVM_CONSTANT_StringIndex: // fall through
+-
+- // At this stage JVM_CONSTANT_UnresolvedClassInError should not be
+- // here
+- case JVM_CONSTANT_UnresolvedClassInError: // fall through
+-
+- default:
+- {
+- // leave a breadcrumb
+- jbyte bad_value = scratch_cp->tag_at(scratch_i).value();
+- ShouldNotReachHere();
+- } break;
+- } // end switch tag value
+-} // end append_entry()
+-
+-
+-int VM_RedefineClasses::find_or_append_indirect_entry(constantPoolHandle scratch_cp,
+- int ref_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS) {
+-
+- int new_ref_i = ref_i;
+- bool match = (ref_i < *merge_cp_length_p) &&
+- scratch_cp->compare_entry_to(ref_i, *merge_cp_p, ref_i, THREAD);
+-
+- if (!match) {
+- // forward reference in *merge_cp_p or not a direct match
+- int found_i = scratch_cp->find_matching_entry(ref_i, *merge_cp_p, THREAD);
+- if (found_i != 0) {
+- guarantee(found_i != ref_i, "compare_entry_to() and find_matching_entry() do not agree");
+- // Found a matching entry somewhere else in *merge_cp_p so just need a mapping entry.
+- new_ref_i = found_i;
+- map_index(scratch_cp, ref_i, found_i);
+- } else {
+- // no match found so we have to append this entry to *merge_cp_p
+- append_entry(scratch_cp, ref_i, merge_cp_p, merge_cp_length_p, THREAD);
+- // The above call to append_entry() can only append one entry
+- // so the post call query of *merge_cp_length_p is only for
+- // the sake of consistency.
+- new_ref_i = *merge_cp_length_p - 1;
+- }
+- }
+-
+- return new_ref_i;
+-} // end find_or_append_indirect_entry()
+-
+-
+-// Append a bootstrap specifier into the merge_cp operands that is semantically equal
+-// to the scratch_cp operands bootstrap specifier passed by the old_bs_i index.
+-// Recursively append new merge_cp entries referenced by the new bootstrap specifier.
+-void VM_RedefineClasses::append_operand(constantPoolHandle scratch_cp, int old_bs_i,
+- constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS) {
+-
+- int old_ref_i = scratch_cp->operand_bootstrap_method_ref_index_at(old_bs_i);
+- int new_ref_i = find_or_append_indirect_entry(scratch_cp, old_ref_i, merge_cp_p,
+- merge_cp_length_p, THREAD);
+- if (new_ref_i != old_ref_i) {
+- RC_TRACE(0x00080000,
+- ("operands entry@%d bootstrap method ref_index change: %d to %d",
+- _operands_cur_length, old_ref_i, new_ref_i));
+- }
+-
+- typeArrayOop merge_ops = (*merge_cp_p)->operands();
+- int new_bs_i = _operands_cur_length;
+- // We have _operands_cur_length == 0 when the merge_cp operands is empty yet.
+- // However, the operand_offset_at(0) was set in the extend_operands() call.
+- int new_base = (new_bs_i == 0) ? (*merge_cp_p)->operand_offset_at(0)
+- : (*merge_cp_p)->operand_next_offset_at(new_bs_i - 1);
+- int argc = scratch_cp->operand_argument_count_at(old_bs_i);
+-
+- constantPoolOopDesc::operand_offset_at_put(merge_ops, _operands_cur_length, new_base);
+- merge_ops->short_at_put(new_base++, new_ref_i);
+- merge_ops->short_at_put(new_base++, argc);
+-
+- for (int i = 0; i < argc; i++) {
+- int old_arg_ref_i = scratch_cp->operand_argument_index_at(old_bs_i, i);
+- int new_arg_ref_i = find_or_append_indirect_entry(scratch_cp, old_arg_ref_i, merge_cp_p,
+- merge_cp_length_p, THREAD);
+- merge_ops->short_at_put(new_base++, new_arg_ref_i);
+- if (new_arg_ref_i != old_arg_ref_i) {
+- RC_TRACE(0x00080000,
+- ("operands entry@%d bootstrap method argument ref_index change: %d to %d",
+- _operands_cur_length, old_arg_ref_i, new_arg_ref_i));
+- }
+- }
+- if (old_bs_i != _operands_cur_length) {
+- // The bootstrap specifier in *merge_cp_p is at a different index than
+- // that in scratch_cp so we need to map the index values.
+- map_operand_index(old_bs_i, new_bs_i);
+- }
+- _operands_cur_length++;
+-} // end append_operand()
+-
+-
+-int VM_RedefineClasses::find_or_append_operand(constantPoolHandle scratch_cp,
+- int old_bs_i, constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS) {
+-
+- int new_bs_i = old_bs_i; // bootstrap specifier index
+- bool match = (old_bs_i < _operands_cur_length) &&
+- scratch_cp->compare_operand_to(old_bs_i, *merge_cp_p, old_bs_i, THREAD);
+-
+- if (!match) {
+- // forward reference in *merge_cp_p or not a direct match
+- int found_i = scratch_cp->find_matching_operand(old_bs_i, *merge_cp_p,
+- _operands_cur_length, THREAD);
+- if (found_i != -1) {
+- guarantee(found_i != old_bs_i, "compare_operand_to() and find_matching_operand() disagree");
+- // found a matching operand somewhere else in *merge_cp_p so just need a mapping
+- new_bs_i = found_i;
+- map_operand_index(old_bs_i, found_i);
+- } else {
+- // no match found so we have to append this bootstrap specifier to *merge_cp_p
+- append_operand(scratch_cp, old_bs_i, merge_cp_p, merge_cp_length_p, THREAD);
+- new_bs_i = _operands_cur_length - 1;
+- }
+- }
+- return new_bs_i;
+-} // end find_or_append_operand()
+-
+-
+-void VM_RedefineClasses::finalize_operands_merge(constantPoolHandle merge_cp, TRAPS) {
+- if (merge_cp->operands() == NULL) {
+- return;
+- }
+- // Shrink the merge_cp operands
+- merge_cp->shrink_operands(_operands_cur_length, CHECK);
+-
+- if (RC_TRACE_ENABLED(0x00040000)) {
+- // don't want to loop unless we are tracing
+- int count = 0;
+- for (int i = 1; i < _operands_index_map_p->length(); i++) {
+- int value = _operands_index_map_p->at(i);
+- if (value != -1) {
+- RC_TRACE_WITH_THREAD(0x00040000, THREAD,
+- ("operands_index_map[%d]: old=%d new=%d", count, i, value));
+- count++;
++
++ int new_count = all_affected_klasses.length() - 1 - i;
++ if (new_count != 0) {
++
++ unlock_threads();
++ RC_TRACE(0x00000001, ("Found new number of affected classes: %d",
++ new_count));
+ }
+ }
+ }
+- // Clean-up
+- _operands_index_map_p = NULL;
+- _operands_cur_length = 0;
+- _operands_index_map_count = 0;
+-} // end finalize_operands_merge()
+-
+-
+-void VM_RedefineClasses::swap_all_method_annotations(int i, int j, instanceKlassHandle scratch_class) {
+- typeArrayOop save;
+-
+- save = scratch_class->get_method_annotations_of(i);
+- scratch_class->set_method_annotations_of(i, scratch_class->get_method_annotations_of(j));
+- scratch_class->set_method_annotations_of(j, save);
+-
+- save = scratch_class->get_method_parameter_annotations_of(i);
+- scratch_class->set_method_parameter_annotations_of(i, scratch_class->get_method_parameter_annotations_of(j));
+- scratch_class->set_method_parameter_annotations_of(j, save);
+-
+- save = scratch_class->get_method_default_annotations_of(i);
+- scratch_class->set_method_default_annotations_of(i, scratch_class->get_method_default_annotations_of(j));
+- scratch_class->set_method_default_annotations_of(j, save);
++
++ if (result != JVMTI_ERROR_NONE) {
++ rollback();
++ return result;
++ }
++
++ RC_TIMER_STOP(_timer_prologue);
++ RC_TIMER_START(_timer_class_linking);
++ // Link and verify new classes _after_ all classes have been updated in the system dictionary!
++ for (int i=0; i<all_affected_klasses.length(); i++) {
++ instanceKlassHandle the_class = all_affected_klasses.at(i);
++ instanceKlassHandle new_class(the_class->new_version());
++
++ RC_TRACE(0x00000002, ("Linking class %d/%d %s",
++ i,
++ all_affected_klasses.length(),
++ the_class->name()->as_C_string()));
++ new_class->link_class(THREAD);
++
++ result = check_exception();
++ if (result != JVMTI_ERROR_NONE) break;
++ }
++ RC_TIMER_STOP(_timer_class_linking);
++ RC_TIMER_START(_timer_prologue);
++
++ if (result != JVMTI_ERROR_NONE) {
++ rollback();
++ return result;
++ }
++
++ RC_TRACE(0x00000002, ("All classes loaded!"));
++
++#ifdef ASSERT
++ for (int i=0; i<all_affected_klasses.length(); i++) {
++ instanceKlassHandle the_class = all_affected_klasses.at(i);
++ assert(the_class->new_version() != NULL, "Must have been redefined");
++ instanceKlassHandle new_version = instanceKlassHandle(THREAD, the_class->new_version());
++ assert(new_version->new_version() == NULL, "Must be newest version");
++
++ if (!(new_version->super() == NULL || new_version->super()->klass_part()->new_version() == NULL)) {
++ new_version()->print();
++ new_version->super()->print();
++ }
++ assert(new_version->super() == NULL || new_version->super()->klass_part()->new_version() == NULL, "Super class must be newest version");
++ }
++
++ SystemDictionary::classes_do(check_class, THREAD);
++
++#endif
++
++ RC_TRACE(0x00000001, ("Finished verification!"));
++ return JVMTI_ERROR_NONE;
+ }
+
+-
+-jvmtiError VM_RedefineClasses::compare_and_normalize_class_versions(
+- instanceKlassHandle the_class,
+- instanceKlassHandle scratch_class) {
++void VM_RedefineClasses::lock_threads() {
++
++ RC_TIMER_START(_timer_wait_for_locks);
++
++
++ JavaThread *javaThread = Threads::first();
++ while (javaThread != NULL) {
++ if (javaThread->is_Compiler_thread() && javaThread != Thread::current()) {
++ CompilerThread *compilerThread = (CompilerThread *)javaThread;
++ compilerThread->set_should_bailout(true);
++ }
++ javaThread = javaThread->next();
++ }
++
++ int cnt = 0;
++ javaThread = Threads::first();
++ while (javaThread != NULL) {
++ if (javaThread->is_Compiler_thread() && javaThread != Thread::current()) {
++ CompilerThread *compilerThread = (CompilerThread *)javaThread;
++ compilerThread->compilation_mutex()->lock();
++ cnt++;
++ }
++ javaThread = javaThread->next();
++ }
++
++ RC_TRACE(0x00000002, ("Locked %d compiler threads", cnt));
++
++ cnt = 0;
++ javaThread = Threads::first();
++ while (javaThread != NULL) {
++ if (javaThread != Thread::current()) {
++ javaThread->redefine_classes_mutex()->lock();
++ }
++ javaThread = javaThread->next();
++ }
++
++
++ RC_TRACE(0x00000002, ("Locked %d threads", cnt));
++
++ RC_TIMER_STOP(_timer_wait_for_locks);
++}
++
++void VM_RedefineClasses::unlock_threads() {
++
++ int cnt = 0;
++ JavaThread *javaThread = Threads::first();
++ Thread *thread = Thread::current();
++ while (javaThread != NULL) {
++ if (javaThread->is_Compiler_thread() && javaThread != Thread::current()) {
++ CompilerThread *compilerThread = (CompilerThread *)javaThread;
++ if (compilerThread->compilation_mutex()->owned_by_self()) {
++ compilerThread->compilation_mutex()->unlock();
++ cnt++;
++ }
++ }
++ javaThread = javaThread->next();
++ }
++
++ RC_TRACE(0x00000002, ("Unlocked %d compiler threads", cnt));
++
++ cnt = 0;
++ javaThread = Threads::first();
++ while (javaThread != NULL) {
++ if (javaThread != Thread::current()) {
++ if (javaThread->redefine_classes_mutex()->owned_by_self()) {
++ javaThread->redefine_classes_mutex()->unlock();
++ }
++ }
++ javaThread = javaThread->next();
++ }
++
++ RC_TRACE(0x00000002, ("Unlocked %d threads", cnt));
++}
++
++jvmtiError VM_RedefineClasses::check_redefinition_allowed(instanceKlassHandle scratch_class) {
++
++
++
++ // Compatibility mode => check for unsupported modification
++
++
++ assert(scratch_class->old_version() != NULL, "must have old version");
++ instanceKlassHandle the_class(scratch_class->old_version());
++
+ int i;
+
+ // Check superclasses, or rather their names, since superclasses themselves can be
+ // requested to replace.
+ // Check for NULL superclass first since this might be java.lang.Object
+ if (the_class->super() != scratch_class->super() &&
+- (the_class->super() == NULL || scratch_class->super() == NULL ||
+- Klass::cast(the_class->super())->name() !=
+- Klass::cast(scratch_class->super())->name())) {
+- return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED;
++ (the_class->super() == NULL || scratch_class->super() == NULL ||
++ Klass::cast(the_class->super())->name() !=
++ Klass::cast(scratch_class->super())->name())) {
++ return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED;
+ }
+
+ // Check if the number, names and order of directly implemented interfaces are the same.
+@@ -622,8 +678,8 @@
+ }
+ for (i = 0; i < n_intfs; i++) {
+ if (Klass::cast((klassOop) k_interfaces->obj_at(i))->name() !=
+- Klass::cast((klassOop) k_new_interfaces->obj_at(i))->name()) {
+- return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED;
++ Klass::cast((klassOop) k_new_interfaces->obj_at(i))->name()) {
++ return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED;
+ }
+ }
+
+@@ -772,12 +828,8 @@
+ idnum_owner->set_method_idnum(new_num);
+ }
+ k_new_method->set_method_idnum(old_num);
+- swap_all_method_annotations(old_num, new_num, scratch_class);
+ }
+ }
+- RC_TRACE(0x00008000, ("Method matched: new: %s [%d] == old: %s [%d]",
+- k_new_method->name_and_sig_as_C_string(), ni,
+- k_old_method->name_and_sig_as_C_string(), oi));
+ // advance to next pair of methods
+ ++oi;
+ ++ni;
+@@ -786,11 +838,11 @@
+ // method added, see if it is OK
+ new_flags = (jushort) k_new_method->access_flags().get_flags();
+ if ((new_flags & JVM_ACC_PRIVATE) == 0
+- // hack: private should be treated as final, but alas
+- || (new_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0
+- ) {
+- // new methods must be private
+- return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_ADDED;
++ // hack: private should be treated as final, but alas
++ || (new_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0
++ ) {
++ // new methods must be private
++ return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_ADDED;
+ }
+ {
+ u2 num = the_class->next_method_idnum();
+@@ -805,24 +857,19 @@
+ idnum_owner->set_method_idnum(new_num);
+ }
+ k_new_method->set_method_idnum(num);
+- swap_all_method_annotations(new_num, num, scratch_class);
+ }
+- RC_TRACE(0x00008000, ("Method added: new: %s [%d]",
+- k_new_method->name_and_sig_as_C_string(), ni));
+ ++ni; // advance to next new method
+ break;
+ case deleted:
+ // method deleted, see if it is OK
+ old_flags = (jushort) k_old_method->access_flags().get_flags();
+ if ((old_flags & JVM_ACC_PRIVATE) == 0
+- // hack: private should be treated as final, but alas
+- || (old_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0
+- ) {
+- // deleted methods must be private
+- return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_DELETED;
++ // hack: private should be treated as final, but alas
++ || (old_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0
++ ) {
++ // deleted methods must be private
++ return JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_DELETED;
+ }
+- RC_TRACE(0x00008000, ("Method deleted: old: %s [%d]",
+- k_old_method->name_and_sig_as_C_string(), oi));
+ ++oi; // advance to next old method
+ break;
+ default:
+@@ -833,2121 +880,2266 @@
+ return JVMTI_ERROR_NONE;
+ }
+
+-
+-// Find new constant pool index value for old constant pool index value
+-// by seaching the index map. Returns zero (0) if there is no mapped
+-// value for the old constant pool index.
+-int VM_RedefineClasses::find_new_index(int old_index) {
+- if (_index_map_count == 0) {
+- // map is empty so nothing can be found
+- return 0;
++int VM_RedefineClasses::calculate_redefinition_flags(instanceKlassHandle new_class) {
++
++ int result = Klass::NoRedefinition;
++
++
++
++ RC_TRACE(0x00000002, ("Comparing different class versions of class %s",
++ new_class->name()->as_C_string()));
++
++ assert(new_class->old_version() != NULL, "must have old version");
++ instanceKlassHandle the_class(new_class->old_version());
++
++ // Check whether class is in the error init state.
++ if (the_class->is_in_error_state()) {
++ // TBD #5057930: special error code is needed in 1.6
++ //result = Klass::union_redefinition_level(result, Klass::Invalid);
+ }
+
+- if (old_index < 1 || old_index >= _index_map_p->length()) {
+- // The old_index is out of range so it is not mapped. This should
+- // not happen in regular constant pool merging use, but it can
+- // happen if a corrupt annotation is processed.
+- return 0;
++ int i;
++
++ //////////////////////////////////////////////////////////////////////////////////////////////////////////
++ // Check superclasses
++ assert(new_class->super() == NULL || new_class->super()->klass_part()->is_newest_version(), "");
++ if (the_class->super() != new_class->super()) {
++ // Super class changed
++
++ klassOop cur_klass = the_class->super();
++ while (cur_klass != NULL) {
++ if (!new_class->is_subclass_of(cur_klass->klass_part()->newest_version())) {
++ RC_TRACE(0x00000002, ("Removed super class %s",
++ cur_klass->klass_part()->name()->as_C_string()));
++ result = result | Klass::RemoveSuperType | Klass::ModifyInstances | Klass::ModifyClass;
++
++ if (!cur_klass->klass_part()->has_subtype_changed()) {
++ RC_TRACE(0x00000002, ("Subtype changed of class %s",
++ cur_klass->klass_part()->name()->as_C_string()));
++ cur_klass->klass_part()->set_subtype_changed(true);
++ }
++ }
++
++ cur_klass = cur_klass->klass_part()->super();
++ }
++
++ cur_klass = new_class->super();
++ while (cur_klass != NULL) {
++ if (!the_class->is_subclass_of(cur_klass->klass_part()->old_version())) {
++ RC_TRACE(0x00000002, ("Added super class %s",
++ cur_klass->klass_part()->name()->as_C_string()));
++ result = result | Klass::ModifyClass | Klass::ModifyInstances;
++ }
++ cur_klass = cur_klass->klass_part()->super();
++ }
+ }
+
+- int value = _index_map_p->at(old_index);
+- if (value == -1) {
+- // the old_index is not mapped
+- return 0;
+- }
+-
+- return value;
+-} // end find_new_index()
+-
+-
+-// Find new bootstrap specifier index value for old bootstrap specifier index
+-// value by seaching the index map. Returns zero (-1) if there is no mapped
+-// value for the old bootstrap specifier index.
+-int VM_RedefineClasses::find_new_operand_index(int old_index) {
+- if (_operands_index_map_count == 0) {
+- // map is empty so nothing can be found
+- return -1;
+- }
+-
+- if (old_index == -1 || old_index >= _operands_index_map_p->length()) {
+- // The old_index is out of range so it is not mapped.
+- // This should not happen in regular constant pool merging use.
+- return -1;
+- }
+-
+- int value = _operands_index_map_p->at(old_index);
+-
+- return value;
+-} // end find_new_operand_index()
+-
+-
+-// Returns true if the current mismatch is due to a resolved/unresolved
+-// class pair. Otherwise, returns false.
+-bool VM_RedefineClasses::is_unresolved_class_mismatch(constantPoolHandle cp1,
+- int index1, constantPoolHandle cp2, int index2) {
+-
+- jbyte t1 = cp1->tag_at(index1).value();
+- if (t1 != JVM_CONSTANT_Class && t1 != JVM_CONSTANT_UnresolvedClass) {
+- return false; // wrong entry type; not our special case
+- }
+-
+- jbyte t2 = cp2->tag_at(index2).value();
+- if (t2 != JVM_CONSTANT_Class && t2 != JVM_CONSTANT_UnresolvedClass) {
+- return false; // wrong entry type; not our special case
+- }
+-
+- if (t1 == t2) {
+- return false; // not a mismatch; not our special case
+- }
+-
+- char *s1 = cp1->klass_name_at(index1)->as_C_string();
+- char *s2 = cp2->klass_name_at(index2)->as_C_string();
+- if (strcmp(s1, s2) != 0) {
+- return false; // strings don't match; not our special case
+- }
+-
+- return true; // made it through the gauntlet; this is our special case
+-} // end is_unresolved_class_mismatch()
+-
+-
+-// Returns true if the current mismatch is due to a resolved/unresolved
+-// string pair. Otherwise, returns false.
+-bool VM_RedefineClasses::is_unresolved_string_mismatch(constantPoolHandle cp1,
+- int index1, constantPoolHandle cp2, int index2) {
+-
+- jbyte t1 = cp1->tag_at(index1).value();
+- if (t1 != JVM_CONSTANT_String && t1 != JVM_CONSTANT_UnresolvedString) {
+- return false; // wrong entry type; not our special case
+- }
+-
+- jbyte t2 = cp2->tag_at(index2).value();
+- if (t2 != JVM_CONSTANT_String && t2 != JVM_CONSTANT_UnresolvedString) {
+- return false; // wrong entry type; not our special case
+- }
+-
+- if (t1 == t2) {
+- return false; // not a mismatch; not our special case
+- }
+-
+- char *s1 = cp1->string_at_noresolve(index1);
+- char *s2 = cp2->string_at_noresolve(index2);
+- if (strcmp(s1, s2) != 0) {
+- return false; // strings don't match; not our special case
+- }
+-
+- return true; // made it through the gauntlet; this is our special case
+-} // end is_unresolved_string_mismatch()
+-
+-
+-jvmtiError VM_RedefineClasses::load_new_class_versions(TRAPS) {
+- // For consistency allocate memory using os::malloc wrapper.
+- _scratch_classes = (instanceKlassHandle *)
+- os::malloc(sizeof(instanceKlassHandle) * _class_count, mtInternal);
+- if (_scratch_classes == NULL) {
+- return JVMTI_ERROR_OUT_OF_MEMORY;
+- }
+-
+- ResourceMark rm(THREAD);
+-
+- JvmtiThreadState *state = JvmtiThreadState::state_for(JavaThread::current());
+- // state can only be NULL if the current thread is exiting which
+- // should not happen since we're trying to do a RedefineClasses
+- guarantee(state != NULL, "exiting thread calling load_new_class_versions");
+- for (int i = 0; i < _class_count; i++) {
+- oop mirror = JNIHandles::resolve_non_null(_class_defs[i].klass);
+- // classes for primitives cannot be redefined
+- if (!is_modifiable_class(mirror)) {
+- return JVMTI_ERROR_UNMODIFIABLE_CLASS;
+- }
+- klassOop the_class_oop = java_lang_Class::as_klassOop(mirror);
+- instanceKlassHandle the_class = instanceKlassHandle(THREAD, the_class_oop);
+- Symbol* the_class_sym = the_class->name();
+-
+- // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark
+- RC_TRACE_WITH_THREAD(0x00000001, THREAD,
+- ("loading name=%s kind=%d (avail_mem=" UINT64_FORMAT "K)",
+- the_class->external_name(), _class_load_kind,
+- os::available_memory() >> 10));
+-
+- ClassFileStream st((u1*) _class_defs[i].class_bytes,
+- _class_defs[i].class_byte_count, (char *)"__VM_RedefineClasses__");
+-
+- // Parse the stream.
+- Handle the_class_loader(THREAD, the_class->class_loader());
+- Handle protection_domain(THREAD, the_class->protection_domain());
+- // Set redefined class handle in JvmtiThreadState class.
+- // This redefined class is sent to agent event handler for class file
+- // load hook event.
+- state->set_class_being_redefined(&the_class, _class_load_kind);
+-
+- klassOop k = SystemDictionary::parse_stream(the_class_sym,
+- the_class_loader,
+- protection_domain,
+- &st,
+- THREAD);
+- // Clear class_being_redefined just to be sure.
+- state->clear_class_being_redefined();
+-
+- // TODO: if this is retransform, and nothing changed we can skip it
+-
+- instanceKlassHandle scratch_class (THREAD, k);
+-
+- if (HAS_PENDING_EXCEPTION) {
+- Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
+- // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark
+- RC_TRACE_WITH_THREAD(0x00000002, THREAD, ("parse_stream exception: '%s'",
+- ex_name->as_C_string()));
+- CLEAR_PENDING_EXCEPTION;
+-
+- if (ex_name == vmSymbols::java_lang_UnsupportedClassVersionError()) {
+- return JVMTI_ERROR_UNSUPPORTED_VERSION;
+- } else if (ex_name == vmSymbols::java_lang_ClassFormatError()) {
+- return JVMTI_ERROR_INVALID_CLASS_FORMAT;
+- } else if (ex_name == vmSymbols::java_lang_ClassCircularityError()) {
+- return JVMTI_ERROR_CIRCULAR_CLASS_DEFINITION;
+- } else if (ex_name == vmSymbols::java_lang_NoClassDefFoundError()) {
+- // The message will be "XXX (wrong name: YYY)"
+- return JVMTI_ERROR_NAMES_DONT_MATCH;
+- } else if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) {
+- return JVMTI_ERROR_OUT_OF_MEMORY;
+- } else { // Just in case more exceptions can be thrown..
+- return JVMTI_ERROR_FAILS_VERIFICATION;
++ //////////////////////////////////////////////////////////////////////////////////////////////////////////
++ // Check interfaces
++
++ // Interfaces removed?
++ objArrayOop old_interfaces = the_class->transitive_interfaces();
++ for (i = 0; i<old_interfaces->length(); i++) {
++ instanceKlassHandle old_interface((klassOop)old_interfaces->obj_at(i));
++ if (!new_class->implements_interface_any_version(old_interface())) {
++ result = result | Klass::RemoveSuperType | Klass::ModifyClass;
++ RC_TRACE(0x00000002, ("Removed interface %s",
++ old_interface->name()->as_C_string()));
++
++ if (!old_interface->has_subtype_changed()) {
++ RC_TRACE(0x00000002, ("Subtype changed of interface %s",
++ old_interface->name()->as_C_string()));
++ old_interface->set_subtype_changed(true);
+ }
+ }
+-
+- // Ensure class is linked before redefine
+- if (!the_class->is_linked()) {
+- the_class->link_class(THREAD);
+- if (HAS_PENDING_EXCEPTION) {
+- Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
+- // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark
+- RC_TRACE_WITH_THREAD(0x00000002, THREAD, ("link_class exception: '%s'",
+- ex_name->as_C_string()));
+- CLEAR_PENDING_EXCEPTION;
+- if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) {
+- return JVMTI_ERROR_OUT_OF_MEMORY;
++ }
++
++ // Interfaces added?
++ objArrayOop new_interfaces = new_class->transitive_interfaces();
++ for (i = 0; i<new_interfaces->length(); i++) {
++ if (!the_class->implements_interface_any_version((klassOop)new_interfaces->obj_at(i))) {
++ result = result | Klass::ModifyClass;
++ RC_TRACE(0x00000002, ("Added interface %s",
++ ((klassOop)new_interfaces->obj_at(i))->klass_part()->name()->as_C_string()));
++ }
++ }
++
++
++ // Check whether class modifiers are the same.
++ jushort old_flags = (jushort) the_class->access_flags().get_flags();
++ jushort new_flags = (jushort) new_class->access_flags().get_flags();
++ if (old_flags != new_flags) {
++ // TODO (tw): Can this have any effects?
++ }
++
++ // Check if the number, names, types and order of fields declared in these classes
++ // are the same.
++ JavaFieldStream old_fs(the_class);
++ JavaFieldStream new_fs(new_class);
++ for (; !old_fs.done() && !new_fs.done(); old_fs.next(), new_fs.next()) {
++ // access
++ old_flags = old_fs.access_flags().as_short();
++ new_flags = new_fs.access_flags().as_short();
++ if ((old_flags ^ new_flags) & JVM_RECOGNIZED_FIELD_MODIFIERS) {
++ // (tw) Can this have any effects?
++ }
++ // offset
++ if (old_fs.offset() != new_fs.offset()) {
++ result = result | Klass::ModifyInstances;
++ }
++ // name and signature
++ Symbol* name_sym1 = the_class->constants()->symbol_at(old_fs.name_index());
++ Symbol* sig_sym1 = the_class->constants()->symbol_at(old_fs.signature_index());
++ Symbol* name_sym2 = new_class->constants()->symbol_at(new_fs.name_index());
++ Symbol* sig_sym2 = new_class->constants()->symbol_at(new_fs.signature_index());
++ if (name_sym1 != name_sym2 || sig_sym1 != sig_sym2) {
++ result = result | Klass::ModifyInstances;
++ }
++ }
++
++ if (!old_fs.done() || !new_fs.done()) {
++ result = result | Klass::ModifyInstances;
++ }
++
++ // Do a parallel walk through the old and new methods. Detect
++ // cases where they match (exist in both), have been added in
++ // the new methods, or have been deleted (exist only in the
++ // old methods). The class file parser places methods in order
++ // by method name, but does not order overloaded methods by
++ // signature. In order to determine what fate befell the methods,
++ // this code places the overloaded new methods that have matching
++ // old methods in the same order as the old methods and places
++ // new overloaded methods at the end of overloaded methods of
++ // that name. The code for this order normalization is adapted
++ // from the algorithm used in instanceKlass::find_method().
++ // Since we are swapping out of order entries as we find them,
++ // we only have to search forward through the overloaded methods.
++ // Methods which are added and have the same name as an existing
++ // method (but different signature) will be put at the end of
++ // the methods with that name, and the name mismatch code will
++ // handle them.
++ objArrayHandle k_old_methods(the_class->methods());
++ objArrayHandle k_new_methods(new_class->methods());
++ int n_old_methods = k_old_methods->length();
++ int n_new_methods = k_new_methods->length();
++
++ int ni = 0;
++ int oi = 0;
++ while (true) {
++ methodOop k_old_method;
++ methodOop k_new_method;
++ enum { matched, added, deleted, undetermined } method_was = undetermined;
++
++ if (oi >= n_old_methods) {
++ if (ni >= n_new_methods) {
++ break; // we've looked at everything, done
++ }
++ // New method at the end
++ k_new_method = (methodOop) k_new_methods->obj_at(ni);
++ method_was = added;
++ } else if (ni >= n_new_methods) {
++ // Old method, at the end, is deleted
++ k_old_method = (methodOop) k_old_methods->obj_at(oi);
++ method_was = deleted;
++ } else {
++ // There are more methods in both the old and new lists
++ k_old_method = (methodOop) k_old_methods->obj_at(oi);
++ k_new_method = (methodOop) k_new_methods->obj_at(ni);
++ if (k_old_method->name() != k_new_method->name()) {
++ // Methods are sorted by method name, so a mismatch means added
++ // or deleted
++ if (k_old_method->name()->fast_compare(k_new_method->name()) > 0) {
++ method_was = added;
+ } else {
+- return JVMTI_ERROR_INTERNAL;
++ method_was = deleted;
++ }
++ } else if (k_old_method->signature() == k_new_method->signature()) {
++ // Both the name and signature match
++ method_was = matched;
++ } else {
++ // The name matches, but the signature doesn't, which means we have to
++ // search forward through the new overloaded methods.
++ int nj; // outside the loop for post-loop check
++ for (nj = ni + 1; nj < n_new_methods; nj++) {
++ methodOop m = (methodOop)k_new_methods->obj_at(nj);
++ if (k_old_method->name() != m->name()) {
++ // reached another method name so no more overloaded methods
++ method_was = deleted;
++ break;
++ }
++ if (k_old_method->signature() == m->signature()) {
++ // found a match so swap the methods
++ k_new_methods->obj_at_put(ni, m);
++ k_new_methods->obj_at_put(nj, k_new_method);
++ k_new_method = m;
++ method_was = matched;
++ break;
++ }
++ }
++
++ if (nj >= n_new_methods) {
++ // reached the end without a match; so method was deleted
++ method_was = deleted;
+ }
+ }
+ }
+
+- // Do the validity checks in compare_and_normalize_class_versions()
+- // before verifying the byte codes. By doing these checks first, we
+- // limit the number of functions that require redirection from
+- // the_class to scratch_class. In particular, we don't have to
+- // modify JNI GetSuperclass() and thus won't change its performance.
+- jvmtiError res = compare_and_normalize_class_versions(the_class,
+- scratch_class);
+- if (res != JVMTI_ERROR_NONE) {
+- return res;
++ switch (method_was) {
++ case matched:
++ // methods match, be sure modifiers do too
++ old_flags = (jushort) k_old_method->access_flags().get_flags();
++ new_flags = (jushort) k_new_method->access_flags().get_flags();
++ if ((old_flags ^ new_flags) & ~(JVM_ACC_NATIVE)) {
++ // (tw) Can this have any effects? Probably yes on vtables?
++ result = result | Klass::ModifyClass;
+ }
+-
+- // verify what the caller passed us
+ {
+- // The bug 6214132 caused the verification to fail.
+- // Information about the_class and scratch_class is temporarily
+- // recorded into jvmtiThreadState. This data is used to redirect
+- // the_class to scratch_class in the JVM_* functions called by the
+- // verifier. Please, refer to jvmtiThreadState.hpp for the detailed
+- // description.
+- RedefineVerifyMark rvm(&the_class, &scratch_class, state);
+- Verifier::verify(
+- scratch_class, Verifier::ThrowException, true, THREAD);
+- }
+-
+- if (HAS_PENDING_EXCEPTION) {
+- Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
+- // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark
+- RC_TRACE_WITH_THREAD(0x00000002, THREAD,
+- ("verify_byte_codes exception: '%s'", ex_name->as_C_string()));
+- CLEAR_PENDING_EXCEPTION;
+- if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) {
+- return JVMTI_ERROR_OUT_OF_MEMORY;
+- } else {
+- // tell the caller the bytecodes are bad
+- return JVMTI_ERROR_FAILS_VERIFICATION;
++ u2 new_num = k_new_method->method_idnum();
++ u2 old_num = k_old_method->method_idnum();
++ if (new_num != old_num) {
++ methodOop idnum_owner = new_class->method_with_idnum(old_num);
++ if (idnum_owner != NULL) {
++ // There is already a method assigned this idnum -- switch them
++ idnum_owner->set_method_idnum(new_num);
++ }
++ k_new_method->set_method_idnum(old_num);
++ RC_TRACE(0x00000002, ("swapping idnum of new and old method %d / %d!",
++ new_num,
++ old_num));
++ // swap_all_method_annotations(old_num, new_num, new_class);
+ }
+ }
+-
+- res = merge_cp_and_rewrite(the_class, scratch_class, THREAD);
+- if (res != JVMTI_ERROR_NONE) {
+- return res;
++ RC_TRACE(0x00008000, ("Method matched: new: %s [%d] == old: %s [%d]",
++ k_new_method->name_and_sig_as_C_string(), ni,
++ k_old_method->name_and_sig_as_C_string(), oi));
++ // advance to next pair of methods
++ ++oi;
++ ++ni;
++ break;
++ case added:
++ // method added, see if it is OK
++ new_flags = (jushort) k_new_method->access_flags().get_flags();
++ if ((new_flags & JVM_ACC_PRIVATE) == 0
++ // hack: private should be treated as final, but alas
++ || (new_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0
++ ) {
++ // new methods must be private
++ result = result | Klass::ModifyClass;
+ }
+-
+- if (VerifyMergedCPBytecodes) {
+- // verify what we have done during constant pool merging
+- {
+- RedefineVerifyMark rvm(&the_class, &scratch_class, state);
+- Verifier::verify(scratch_class, Verifier::ThrowException, true, THREAD);
++ {
++ u2 num = the_class->next_method_idnum();
++ if (num == constMethodOopDesc::UNSET_IDNUM) {
++ // cannot add any more methods
++ result = result | Klass::ModifyClass;
+ }
+-
+- if (HAS_PENDING_EXCEPTION) {
+- Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
+- // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark
+- RC_TRACE_WITH_THREAD(0x00000002, THREAD,
+- ("verify_byte_codes post merge-CP exception: '%s'",
+- ex_name->as_C_string()));
+- CLEAR_PENDING_EXCEPTION;
+- if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) {
+- return JVMTI_ERROR_OUT_OF_MEMORY;
+- } else {
+- // tell the caller that constant pool merging screwed up
+- return JVMTI_ERROR_INTERNAL;
++ u2 new_num = k_new_method->method_idnum();
++ methodOop idnum_owner = new_class->method_with_idnum(num);
++ if (idnum_owner != NULL) {
++ // There is already a method assigned this idnum -- switch them
++ idnum_owner->set_method_idnum(new_num);
++ }
++ k_new_method->set_method_idnum(num);
++ //swap_all_method_annotations(new_num, num, new_class);
++ }
++ RC_TRACE(0x00000001, ("Method added: new: %s [%d]",
++ k_new_method->name_and_sig_as_C_string(), ni));
++ ++ni; // advance to next new method
++ break;
++ case deleted:
++ // method deleted, see if it is OK
++ old_flags = (jushort) k_old_method->access_flags().get_flags();
++ if ((old_flags & JVM_ACC_PRIVATE) == 0
++ // hack: private should be treated as final, but alas
++ || (old_flags & (JVM_ACC_FINAL|JVM_ACC_STATIC)) == 0
++ ) {
++ // deleted methods must be private
++ result = result | Klass::ModifyClass;
++ }
++ RC_TRACE(0x00000001, ("Method deleted: old: %s [%d]",
++ k_old_method->name_and_sig_as_C_string(), oi));
++ ++oi; // advance to next old method
++ break;
++ default:
++ ShouldNotReachHere();
++ }
++ }
++
++ if (new_class()->size() != new_class->old_version()->size()) {
++ result |= Klass::ModifyClassSize;
++ }
++
++ if (new_class->size_helper() != ((instanceKlass*)(new_class->old_version()->klass_part()))->size_helper()) {
++ result |= Klass::ModifyInstanceSize;
++ }
++
++ methodHandle instanceTransformerMethod(new_class->find_method(vmSymbols::transformer_name(), vmSymbols::void_method_signature()));
++ if (!instanceTransformerMethod.is_null() && !instanceTransformerMethod->is_static()) {
++ result |= Klass::HasInstanceTransformer;
++ }
++
++ // (tw) Check method bodies to be able to return NoChange?
++ return result;
++}
++
++void VM_RedefineClasses::calculate_instance_update_information(klassOop new_version) {
++
++ class UpdateFieldsEvolutionClosure : public FieldEvolutionClosure {
++
++ private:
++
++ GrowableArray<int> info;
++ int curPosition;
++ bool copy_backwards;
++
++ public:
++
++ bool does_copy_backwards() {
++ return copy_backwards;
++ }
++
++ UpdateFieldsEvolutionClosure(klassOop klass) {
++
++ int base_offset = instanceOopDesc::base_offset_in_bytes();
++
++ if (klass->klass_part()->newest_version() == SystemDictionary::Reference_klass()->klass_part()->newest_version()) {
++ base_offset += java_lang_ref_Reference::number_of_fake_oop_fields*size_of_type(T_OBJECT);
++ }
++
++ info.append(base_offset);
++ info.append(0);
++ curPosition = base_offset;
++ copy_backwards = false;
++ }
++
++ GrowableArray<int> &finish() {
++ info.append(0);
++ return info;
++ }
++
++ virtual void do_new_field(fieldDescriptor* fd){
++ int alignment = fd->offset() - curPosition;
++ if (alignment > 0) {
++ // This field was aligned, so we need to make sure that we fill the gap
++ fill(alignment);
++ }
++
++ int size = size_of_type(fd->field_type());
++ fill(size);
++ }
++
++ private:
++
++ void fill(int size) {
++ if (info.length() > 0 && info.at(info.length() - 1) < 0) {
++ (*info.adr_at(info.length() - 1)) -= size;
++ } else {
++ info.append(-size);
++ }
++
++ curPosition += size;
++ }
++
++ int size_of_type(BasicType type) {
++ int size = 0;
++ switch(type) {
++ case T_BOOLEAN:
++ size = sizeof(jboolean);
++ break;
++
++ case T_CHAR:
++ size = (sizeof(jchar));
++ break;
++
++ case T_FLOAT:
++ size = (sizeof(jfloat));
++ break;
++
++ case T_DOUBLE:
++ size = (sizeof(jdouble));
++ break;
++
++ case T_BYTE:
++ size = (sizeof(jbyte));
++ break;
++
++ case T_SHORT:
++ size = (sizeof(jshort));
++ break;
++
++ case T_INT:
++ size = (sizeof(jint));
++ break;
++
++ case T_LONG:
++ size = (sizeof(jlong));
++ break;
++
++ case T_OBJECT:
++ case T_ARRAY:
++ if (UseCompressedOops) {
++ size = sizeof(narrowOop);
++ } else {
++ size = (sizeof(oop));
++ }
++ break;
++
++ default:
++ ShouldNotReachHere();
++ }
++
++ assert(size > 0, "");
++ return size;
++
++ }
++
++ public:
++
++ virtual void do_old_field(fieldDescriptor* fd){}
++
++ virtual void do_changed_field(fieldDescriptor* old_fd, fieldDescriptor *new_fd){
++
++ int alignment = new_fd->offset() - curPosition;
++ if (alignment > 0) {
++ // This field was aligned, so we need to make sure that we fill the gap
++ fill(alignment);
++ }
++
++ assert(old_fd->field_type() == new_fd->field_type(), "");
++ assert(curPosition == new_fd->offset(), "must be correct offset!");
++
++ int offset = old_fd->offset();
++ int size = size_of_type(old_fd->field_type());
++
++ int prevEnd = -1;
++ if (info.length() > 0 && info.at(info.length() - 1) > 0) {
++ prevEnd = info.at(info.length() - 2) + info.at(info.length() - 1);
++ }
++
++ if (prevEnd == offset) {
++ info.at_put(info.length() - 2, info.at(info.length() - 2) + size);
++ } else {
++ info.append(size);
++ info.append(offset);
++ }
++
++ if (old_fd->offset() < new_fd->offset()) {
++ copy_backwards = true;
++ }
++
++ transfer_special_access_flags(old_fd, new_fd);
++
++ curPosition += size;
++ }
++ };
++
++ UpdateFieldsEvolutionClosure cl(new_version);
++ ((instanceKlass*)new_version->klass_part())->do_fields_evolution(&cl);
++
++ GrowableArray<int> result = cl.finish();
++ ((instanceKlass*)new_version->klass_part())->store_update_information(result);
++ ((instanceKlass*)new_version->klass_part())->set_copying_backwards(cl.does_copy_backwards());
++
++ if (RC_TRACE_ENABLED(0x00000002)) {
++ RC_TRACE(0x00000002, ("Instance update information for %s:",
++ new_version->klass_part()->name()->as_C_string()));
++ if (cl.does_copy_backwards()) {
++ RC_TRACE(0x00000002, ("\tDoes copy backwards!"));
++ }
++ for (int i=0; i<result.length(); i++) {
++ int curNum = result.at(i);
++ if (curNum < 0) {
++ RC_TRACE(0x00000002, ("\t%d CLEAN", curNum));
++ } else if (curNum > 0) {
++ RC_TRACE(0x00000002, ("\t%d COPY from %d", curNum, result.at(i + 1)));
++ i++;
++ } else {
++ RC_TRACE(0x00000002, ("\tEND"));
++ }
++ }
++ }
++}
++
++Symbol* VM_RedefineClasses::signature_to_class_name(Symbol* signature) {
++ assert(FieldType::is_obj(signature), "");
++ return SymbolTable::new_symbol(signature->as_C_string() + 1, signature->utf8_length() - 2, Thread::current());
++}
++
++void VM_RedefineClasses::calculate_type_check_information(klassOop klass) {
++ if (klass->klass_part()->is_redefining()) {
++ klass = klass->klass_part()->old_version();
++ }
++
++ // We found an instance klass!
++ instanceKlass *cur_instance_klass = instanceKlass::cast(klass);
++ GrowableArray< Pair<int, klassOop> > type_check_information;
++
++ class MyFieldClosure : public FieldClosure {
++
++ public:
++
++ GrowableArray< Pair<int, klassOop> > *_arr;
++
++ MyFieldClosure(GrowableArray< Pair<int, klassOop> > *arr) {
++ _arr = arr;
++ }
++
++ virtual void do_field(fieldDescriptor* fd) {
++ if (fd->field_type() == T_OBJECT) {
++ Symbol* signature = fd->signature();
++ if (FieldType::is_obj(signature)) {
++ Symbol* name = signature_to_class_name(signature);
++ klassOop field_klass;
++ if (is_field_dangerous(name, fd, field_klass)) {
++ RC_TRACE(0x00000002, ("Found dangerous field %s in klass %s of type %s",
++ fd->name()->as_C_string(),
++ fd->field_holder()->klass_part()->name()->as_C_string(),
++ name->as_C_string()));
++ _arr->append(Pair<int, klassOop>(fd->offset(), field_klass->klass_part()->newest_version()));
++ }
++ }
++
++ // Array fields can never be a problem!
++ }
++ }
++
++ bool is_field_dangerous(Symbol* klass_name, fieldDescriptor *fd, klassOop &field_klass) {
++ field_klass = SystemDictionary::find(klass_name, fd->field_holder()->klass_part()->class_loader(),
++ fd->field_holder()->klass_part()->protection_domain(), Thread::current());
++ if(field_klass != NULL) {
++ if (field_klass->klass_part()->is_redefining()) {
++ field_klass = field_klass->klass_part()->old_version();
++ }
++ if (field_klass->klass_part()->has_subtype_changed()) {
++ return true;
++ }
++ }
++ return false;
++ }
++ };
++
++ MyFieldClosure fieldClosure(&type_check_information);
++ cur_instance_klass->do_nonstatic_fields(&fieldClosure);
++
++ if (type_check_information.length() > 0) {
++ type_check_information.append(Pair<int, klassOop>(-1, NULL));
++ cur_instance_klass->store_type_check_information(type_check_information);
++ }
++}
++
++bool VM_RedefineClasses::check_field_value_types() {
++
++ Thread *THREAD = Thread::current();
++ class CheckFieldTypesClosure : public ObjectClosure {
++
++ private:
++
++ bool _result;
++
++ public:
++
++ CheckFieldTypesClosure() {
++ _result = true;
++ }
++
++ bool result() { return _result; }
++
++ virtual void do_object(oop obj) {
++
++ if (!_result) {
++ return;
++ }
++
++ if (obj->is_objArray()) {
++
++ objArrayOop array = objArrayOop(obj);
++
++ klassOop element_klass = objArrayKlass::cast(array->klass())->element_klass();
++
++ if (element_klass->klass_part()->has_subtype_changed()) {
++ int length = array->length();
++ for (int i=0; i<length; i++) {
++ oop element = array->obj_at(i);
++ if (element != NULL && element->blueprint()->newest_version()->klass_part()->is_redefining()) {
++ // Check subtype relationship to static type of array
++ if (!element->blueprint()->newest_version()->klass_part()->is_subtype_of(element_klass->klass_part()->newest_version())) {
++ RC_TRACE(0x00000001, ("Array value is INVALID - abort redefinition (static_type=%s, index=%d, dynamic_type=%s)",
++ element_klass->klass_part()->name()->as_C_string(),
++ i,
++ element->blueprint()->name()->as_C_string()));
++ _result = false;
++ break;
++ }
++ }
++ }
++ }
++
++ } else {
++ Pair<int, klassOop> *cur = obj->klass()->klass_part()->type_check_information();
++ if (cur != NULL) {
++ // Type check information exists for this oop
++ while ((*cur).left() != -1) {
++ check_field(obj, (*cur).left(), (*cur).right());
++ cur++;
++ }
+ }
+ }
+ }
+
+- Rewriter::rewrite(scratch_class, THREAD);
+- if (!HAS_PENDING_EXCEPTION) {
+- Rewriter::relocate_and_link(scratch_class, THREAD);
+- }
+- if (HAS_PENDING_EXCEPTION) {
+- Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
+- CLEAR_PENDING_EXCEPTION;
+- if (ex_name == vmSymbols::java_lang_OutOfMemoryError()) {
+- return JVMTI_ERROR_OUT_OF_MEMORY;
+- } else {
+- return JVMTI_ERROR_INTERNAL;
+- }
+- }
+-
+- _scratch_classes[i] = scratch_class;
+-
+- // RC_TRACE_WITH_THREAD macro has an embedded ResourceMark
+- RC_TRACE_WITH_THREAD(0x00000001, THREAD,
+- ("loaded name=%s (avail_mem=" UINT64_FORMAT "K)",
+- the_class->external_name(), os::available_memory() >> 10));
+- }
+-
+- return JVMTI_ERROR_NONE;
+-}
+-
+-
+-// Map old_index to new_index as needed. scratch_cp is only needed
+-// for RC_TRACE() calls.
+-void VM_RedefineClasses::map_index(constantPoolHandle scratch_cp,
+- int old_index, int new_index) {
+- if (find_new_index(old_index) != 0) {
+- // old_index is already mapped
+- return;
+- }
+-
+- if (old_index == new_index) {
+- // no mapping is needed
+- return;
+- }
+-
+- _index_map_p->at_put(old_index, new_index);
+- _index_map_count++;
+-
+- RC_TRACE(0x00040000, ("mapped tag %d at index %d to %d",
+- scratch_cp->tag_at(old_index).value(), old_index, new_index));
+-} // end map_index()
+-
+-
+-// Map old_index to new_index as needed.
+-void VM_RedefineClasses::map_operand_index(int old_index, int new_index) {
+- if (find_new_operand_index(old_index) != -1) {
+- // old_index is already mapped
+- return;
+- }
+-
+- if (old_index == new_index) {
+- // no mapping is needed
+- return;
+- }
+-
+- _operands_index_map_p->at_put(old_index, new_index);
+- _operands_index_map_count++;
+-
+- RC_TRACE(0x00040000, ("mapped bootstrap specifier at index %d to %d", old_index, new_index));
+-} // end map_index()
+-
+-
+-// Merge old_cp and scratch_cp and return the results of the merge via
+-// merge_cp_p. The number of entries in *merge_cp_p is returned via
+-// merge_cp_length_p. The entries in old_cp occupy the same locations
+-// in *merge_cp_p. Also creates a map of indices from entries in
+-// scratch_cp to the corresponding entry in *merge_cp_p. Index map
+-// entries are only created for entries in scratch_cp that occupy a
+-// different location in *merged_cp_p.
+-bool VM_RedefineClasses::merge_constant_pools(constantPoolHandle old_cp,
+- constantPoolHandle scratch_cp, constantPoolHandle *merge_cp_p,
+- int *merge_cp_length_p, TRAPS) {
+-
+- if (merge_cp_p == NULL) {
+- assert(false, "caller must provide scatch constantPool");
+- return false; // robustness
+- }
+- if (merge_cp_length_p == NULL) {
+- assert(false, "caller must provide scatch CP length");
+- return false; // robustness
+- }
+- // Worst case we need old_cp->length() + scratch_cp()->length(),
+- // but the caller might be smart so make sure we have at least
+- // the minimum.
+- if ((*merge_cp_p)->length() < old_cp->length()) {
+- assert(false, "merge area too small");
+- return false; // robustness
+- }
+-
+- RC_TRACE_WITH_THREAD(0x00010000, THREAD,
+- ("old_cp_len=%d, scratch_cp_len=%d", old_cp->length(),
+- scratch_cp->length()));
+-
+- {
+- // Pass 0:
+- // The old_cp is copied to *merge_cp_p; this means that any code
+- // using old_cp does not have to change. This work looks like a
+- // perfect fit for constantPoolOop::copy_cp_to(), but we need to
+- // handle one special case:
+- // - revert JVM_CONSTANT_Class to JVM_CONSTANT_UnresolvedClass
+- // This will make verification happy.
+-
+- int old_i; // index into old_cp
+-
+- // index zero (0) is not used in constantPools
+- for (old_i = 1; old_i < old_cp->length(); old_i++) {
+- // leave debugging crumb
+- jbyte old_tag = old_cp->tag_at(old_i).value();
+- switch (old_tag) {
+- case JVM_CONSTANT_Class:
+- case JVM_CONSTANT_UnresolvedClass:
+- // revert the copy to JVM_CONSTANT_UnresolvedClass
+- // May be resolving while calling this so do the same for
+- // JVM_CONSTANT_UnresolvedClass (klass_name_at() deals with transition)
+- (*merge_cp_p)->unresolved_klass_at_put(old_i,
+- old_cp->klass_name_at(old_i));
+- break;
+-
+- case JVM_CONSTANT_Double:
+- case JVM_CONSTANT_Long:
+- // just copy the entry to *merge_cp_p, but double and long take
+- // two constant pool entries
+- constantPoolOopDesc::copy_entry_to(old_cp, old_i, *merge_cp_p, old_i, CHECK_0);
+- old_i++;
+- break;
+-
+- default:
+- // just copy the entry to *merge_cp_p
+- constantPoolOopDesc::copy_entry_to(old_cp, old_i, *merge_cp_p, old_i, CHECK_0);
+- break;
+- }
+- } // end for each old_cp entry
+-
+- constantPoolOopDesc::copy_operands(old_cp, *merge_cp_p, CHECK_0);
+- (*merge_cp_p)->extend_operands(scratch_cp, CHECK_0);
+-
+- // We don't need to sanity check that *merge_cp_length_p is within
+- // *merge_cp_p bounds since we have the minimum on-entry check above.
+- (*merge_cp_length_p) = old_i;
+- }
+-
+- // merge_cp_len should be the same as old_cp->length() at this point
+- // so this trace message is really a "warm-and-breathing" message.
+- RC_TRACE_WITH_THREAD(0x00020000, THREAD,
+- ("after pass 0: merge_cp_len=%d", *merge_cp_length_p));
+-
+- int scratch_i; // index into scratch_cp
+- {
+- // Pass 1a:
+- // Compare scratch_cp entries to the old_cp entries that we have
+- // already copied to *merge_cp_p. In this pass, we are eliminating
+- // exact duplicates (matching entry at same index) so we only
+- // compare entries in the common indice range.
+- int increment = 1;
+- int pass1a_length = MIN2(old_cp->length(), scratch_cp->length());
+- for (scratch_i = 1; scratch_i < pass1a_length; scratch_i += increment) {
+- switch (scratch_cp->tag_at(scratch_i).value()) {
+- case JVM_CONSTANT_Double:
+- case JVM_CONSTANT_Long:
+- // double and long take two constant pool entries
+- increment = 2;
+- break;
+-
+- default:
+- increment = 1;
+- break;
+- }
+-
+- bool match = scratch_cp->compare_entry_to(scratch_i, *merge_cp_p,
+- scratch_i, CHECK_0);
+- if (match) {
+- // found a match at the same index so nothing more to do
+- continue;
+- } else if (is_unresolved_class_mismatch(scratch_cp, scratch_i,
+- *merge_cp_p, scratch_i)) {
+- // The mismatch in compare_entry_to() above is because of a
+- // resolved versus unresolved class entry at the same index
+- // with the same string value. Since Pass 0 reverted any
+- // class entries to unresolved class entries in *merge_cp_p,
+- // we go with the unresolved class entry.
+- continue;
+- } else if (is_unresolved_string_mismatch(scratch_cp, scratch_i,
+- *merge_cp_p, scratch_i)) {
+- // The mismatch in compare_entry_to() above is because of a
+- // resolved versus unresolved string entry at the same index
+- // with the same string value. We can live with whichever
+- // happens to be at scratch_i in *merge_cp_p.
+- continue;
+- }
+-
+- int found_i = scratch_cp->find_matching_entry(scratch_i, *merge_cp_p,
+- CHECK_0);
+- if (found_i != 0) {
+- guarantee(found_i != scratch_i,
+- "compare_entry_to() and find_matching_entry() do not agree");
+-
+- // Found a matching entry somewhere else in *merge_cp_p so
+- // just need a mapping entry.
+- map_index(scratch_cp, scratch_i, found_i);
+- continue;
+- }
+-
+- // The find_matching_entry() call above could fail to find a match
+- // due to a resolved versus unresolved class or string entry situation
+- // like we solved above with the is_unresolved_*_mismatch() calls.
+- // However, we would have to call is_unresolved_*_mismatch() over
+- // all of *merge_cp_p (potentially) and that doesn't seem to be
+- // worth the time.
+-
+- // No match found so we have to append this entry and any unique
+- // referenced entries to *merge_cp_p.
+- append_entry(scratch_cp, scratch_i, merge_cp_p, merge_cp_length_p,
+- CHECK_0);
+- }
+- }
+-
+- RC_TRACE_WITH_THREAD(0x00020000, THREAD,
+- ("after pass 1a: merge_cp_len=%d, scratch_i=%d, index_map_len=%d",
+- *merge_cp_length_p, scratch_i, _index_map_count));
+-
+- if (scratch_i < scratch_cp->length()) {
+- // Pass 1b:
+- // old_cp is smaller than scratch_cp so there are entries in
+- // scratch_cp that we have not yet processed. We take care of
+- // those now.
+- int increment = 1;
+- for (; scratch_i < scratch_cp->length(); scratch_i += increment) {
+- switch (scratch_cp->tag_at(scratch_i).value()) {
+- case JVM_CONSTANT_Double:
+- case JVM_CONSTANT_Long:
+- // double and long take two constant pool entries
+- increment = 2;
+- break;
+-
+- default:
+- increment = 1;
+- break;
+- }
+-
+- int found_i =
+- scratch_cp->find_matching_entry(scratch_i, *merge_cp_p, CHECK_0);
+- if (found_i != 0) {
+- // Found a matching entry somewhere else in *merge_cp_p so
+- // just need a mapping entry.
+- map_index(scratch_cp, scratch_i, found_i);
+- continue;
+- }
+-
+- // No match found so we have to append this entry and any unique
+- // referenced entries to *merge_cp_p.
+- append_entry(scratch_cp, scratch_i, merge_cp_p, merge_cp_length_p,
+- CHECK_0);
+- }
+-
+- RC_TRACE_WITH_THREAD(0x00020000, THREAD,
+- ("after pass 1b: merge_cp_len=%d, scratch_i=%d, index_map_len=%d",
+- *merge_cp_length_p, scratch_i, _index_map_count));
+- }
+- finalize_operands_merge(*merge_cp_p, THREAD);
+-
+- return true;
+-} // end merge_constant_pools()
+-
+-
+-// Merge constant pools between the_class and scratch_class and
+-// potentially rewrite bytecodes in scratch_class to use the merged
+-// constant pool.
+-jvmtiError VM_RedefineClasses::merge_cp_and_rewrite(
+- instanceKlassHandle the_class, instanceKlassHandle scratch_class,
+- TRAPS) {
+- // worst case merged constant pool length is old and new combined
+- int merge_cp_length = the_class->constants()->length()
+- + scratch_class->constants()->length();
+-
+- constantPoolHandle old_cp(THREAD, the_class->constants());
+- constantPoolHandle scratch_cp(THREAD, scratch_class->constants());
+-
+- // Constant pools are not easily reused so we allocate a new one
+- // each time.
+- // merge_cp is created unsafe for concurrent GC processing. It
+- // should be marked safe before discarding it. Even though
+- // garbage, if it crosses a card boundary, it may be scanned
+- // in order to find the start of the first complete object on the card.
+- constantPoolHandle merge_cp(THREAD,
+- oopFactory::new_constantPool(merge_cp_length,
+- oopDesc::IsUnsafeConc,
+- THREAD));
+- int orig_length = old_cp->orig_length();
+- if (orig_length == 0) {
+- // This old_cp is an actual original constant pool. We save
+- // the original length in the merged constant pool so that
+- // merge_constant_pools() can be more efficient. If a constant
+- // pool has a non-zero orig_length() value, then that constant
+- // pool was created by a merge operation in RedefineClasses.
+- merge_cp->set_orig_length(old_cp->length());
+- } else {
+- // This old_cp is a merged constant pool from a previous
+- // RedefineClasses() calls so just copy the orig_length()
+- // value.
+- merge_cp->set_orig_length(old_cp->orig_length());
+- }
+-
+- ResourceMark rm(THREAD);
+- _index_map_count = 0;
+- _index_map_p = new intArray(scratch_cp->length(), -1);
+-
+- _operands_cur_length = constantPoolOopDesc::operand_array_length(old_cp->operands());
+- _operands_index_map_count = 0;
+- _operands_index_map_p = new intArray(
+- constantPoolOopDesc::operand_array_length(scratch_cp->operands()), -1);
+-
+- // reference to the cp holder is needed for copy_operands()
+- merge_cp->set_pool_holder(scratch_class());
+- bool result = merge_constant_pools(old_cp, scratch_cp, &merge_cp,
+- &merge_cp_length, THREAD);
+- merge_cp->set_pool_holder(NULL);
+-
+- if (!result) {
+- // The merge can fail due to memory allocation failure or due
+- // to robustness checks.
+- return JVMTI_ERROR_INTERNAL;
+- }
+-
+- RC_TRACE_WITH_THREAD(0x00010000, THREAD,
+- ("merge_cp_len=%d, index_map_len=%d", merge_cp_length, _index_map_count));
+-
+- if (_index_map_count == 0) {
+- // there is nothing to map between the new and merged constant pools
+-
+- if (old_cp->length() == scratch_cp->length()) {
+- // The old and new constant pools are the same length and the
+- // index map is empty. This means that the three constant pools
+- // are equivalent (but not the same). Unfortunately, the new
+- // constant pool has not gone through link resolution nor have
+- // the new class bytecodes gone through constant pool cache
+- // rewriting so we can't use the old constant pool with the new
+- // class.
+-
+- merge_cp()->set_is_conc_safe(true);
+- merge_cp = constantPoolHandle(); // toss the merged constant pool
+- } else if (old_cp->length() < scratch_cp->length()) {
+- // The old constant pool has fewer entries than the new constant
+- // pool and the index map is empty. This means the new constant
+- // pool is a superset of the old constant pool. However, the old
+- // class bytecodes have already gone through constant pool cache
+- // rewriting so we can't use the new constant pool with the old
+- // class.
+-
+- merge_cp()->set_is_conc_safe(true);
+- merge_cp = constantPoolHandle(); // toss the merged constant pool
+- } else {
+- // The old constant pool has more entries than the new constant
+- // pool and the index map is empty. This means that both the old
+- // and merged constant pools are supersets of the new constant
+- // pool.
+-
+- // Replace the new constant pool with a shrunken copy of the
+- // merged constant pool; the previous new constant pool will
+- // get GCed.
+- set_new_constant_pool(scratch_class, merge_cp, merge_cp_length,
+- THREAD);
+- // drop local ref to the merged constant pool
+- merge_cp()->set_is_conc_safe(true);
+- merge_cp = constantPoolHandle();
+- }
+- } else {
+- if (RC_TRACE_ENABLED(0x00040000)) {
+- // don't want to loop unless we are tracing
+- int count = 0;
+- for (int i = 1; i < _index_map_p->length(); i++) {
+- int value = _index_map_p->at(i);
+-
+- if (value != -1) {
+- RC_TRACE_WITH_THREAD(0x00040000, THREAD,
+- ("index_map[%d]: old=%d new=%d", count, i, value));
+- count++;
++ void check_field(oop obj, int offset, klassOop static_type) {
++ oop field_value = obj->obj_field(offset);
++ if (field_value != NULL) {
++ // Field is not null
++ if (field_value->klass()->klass_part()->newest_version()->klass_part()->is_subtype_of(static_type)) {
++ // We are OK
++ RC_TRACE(0x00008000, ("Field value is OK (klass=%s, static_type=%s, offset=%d, dynamic_type=%s)",
++ obj->klass()->klass_part()->name()->as_C_string(),
++ static_type->klass_part()->name()->as_C_string(),
++ offset,
++ field_value->klass()->klass_part()->name()->as_C_string()));
++ } else {
++ // Failure!
++ RC_TRACE(0x00000001, ("Field value is INVALID - abort redefinition (klass=%s, static_type=%s, offset=%d, dynamic_type=%s)",
++ obj->klass()->klass_part()->name()->as_C_string(),
++ static_type->klass_part()->name()->as_C_string(),
++ offset,
++ field_value->klass()->klass_part()->name()->as_C_string()));
++ _result = false;
+ }
+ }
+ }
+-
+- // We have entries mapped between the new and merged constant pools
+- // so we have to rewrite some constant pool references.
+- if (!rewrite_cp_refs(scratch_class, THREAD)) {
+- return JVMTI_ERROR_INTERNAL;
++ };
++
++ CheckFieldTypesClosure myObjectClosure;
++
++ // make sure that heap is parsable (fills TLABs with filler objects)
++ Universe::heap()->ensure_parsability(false); // no need to retire TLABs
++
++ // do the iteration
++ // If this operation encounters a bad object when using CMS,
++ // consider using safe_object_iterate() which avoids perm gen
++ // objects that may contain bad references.
++ Universe::heap()->object_iterate(&myObjectClosure);
++
++ // when sharing is enabled we must iterate over the shared spaces
++ if (UseSharedSpaces) {
++ GenCollectedHeap* gch = GenCollectedHeap::heap();
++ CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen();
++ gen->ro_space()->object_iterate(&myObjectClosure);
++ gen->rw_space()->object_iterate(&myObjectClosure);
++ }
++
++ return myObjectClosure.result();
++}
++
++void VM_RedefineClasses::clear_type_check_information(klassOop k) {
++ if (k->klass_part()->is_redefining()) {
++ k = k->klass_part()->old_version();
++ }
++
++ // We found an instance klass!
++ instanceKlass *cur_instance_klass = instanceKlass::cast(k);
++ cur_instance_klass->clear_type_check_information();
++}
++
++void VM_RedefineClasses::update_active_methods() {
++
++ RC_TRACE(0x00000002, ("Updating active methods"));
++ JavaThread *java_thread = Threads::first();
++ while (java_thread != NULL) {
++
++ int stack_depth = 0;
++ if (java_thread->has_last_Java_frame()) {
++
++ RC_TRACE(0x0000000400, ("checking stack of Java thread %s", java_thread->name()));
++
++ // vframes are resource allocated
++ Thread* current_thread = Thread::current();
++ ResourceMark rm(current_thread);
++ HandleMark hm(current_thread);
++
++ RegisterMap reg_map(java_thread);
++ frame f = java_thread->last_frame();
++ vframe* vf = vframe::new_vframe(&f, ®_map, java_thread);
++ frame* last_entry_frame = NULL;
++
++ while (vf != NULL) {
++ if (vf->is_java_frame()) {
++ // java frame (interpreted, compiled, ...)
++ javaVFrame *jvf = javaVFrame::cast(vf);
++
++ if (!(jvf->method()->is_native())) {
++ int bci = jvf->bci();
++ RC_TRACE(0x00000400, ("found method: %s / bci=%d", jvf->method()->name()->as_C_string(), bci));
++ ResourceMark rm(Thread::current());
++ HandleMark hm;
++ instanceKlassHandle klass(jvf->method()->method_holder());
++
++ if (jvf->method()->new_version() != NULL && jvf->is_interpreted_frame()) {
++
++
++ RC_TRACE(0x00000002, ("Found method that should just be updated to the newest version %s",
++ jvf->method()->name_and_sig_as_C_string()));
++
++ if (RC_TRACE_ENABLED(0x01000000)) {
++ int code_size = jvf->method()->code_size();
++ char *code_base_old = (char*)jvf->method()->code_base();
++ char *code_base_new = (char*)jvf->method()->new_version()->code_base();
++ for (int i=0; i<code_size; i++) {
++ tty->print_cr("old=%d new=%d", *code_base_old++, *code_base_new++);
++ }
++ jvf->method()->print_codes_on(tty);
++ jvf->method()->new_version()->print_codes_on(tty);
++ }
++
++ assert(jvf->is_interpreted_frame(), "Every frame must be interpreted!");
++ interpretedVFrame *iframe = (interpretedVFrame *)jvf;
++
++
++ if (RC_TRACE_ENABLED(0x01000000)) {
++ constantPoolCacheOop cp_old = jvf->method()->constants()->cache();
++ tty->print_cr("old cp");
++ for (int i=0; i<cp_old->length(); i++) {
++ cp_old->entry_at(i)->print(tty, i);
++ }
++ constantPoolCacheOop cp_new = jvf->method()->new_version()->constants()->cache();
++ tty->print_cr("new cp");
++ for (int i=0; i<cp_new->length(); i++) {
++ cp_new->entry_at(i)->print(tty, i);
++ }
++ }
++
++ iframe->set_method(jvf->method()->new_version(), bci);
++ RC_TRACE(0x00000002, ("Updated method to newer version"));
++ assert(jvf->method()->new_version() == NULL, "must be latest version");
++
++ }
++ }
++ }
++ vf = vf->sender();
++ }
+ }
+
+- // Replace the new constant pool with a shrunken copy of the
+- // merged constant pool so now the rewritten bytecodes have
+- // valid references; the previous new constant pool will get
+- // GCed.
+- set_new_constant_pool(scratch_class, merge_cp, merge_cp_length,
+- THREAD);
+- merge_cp()->set_is_conc_safe(true);
++ // Advance to next thread
++ java_thread = java_thread->next();
+ }
+- assert(old_cp()->is_conc_safe(), "Just checking");
+- assert(scratch_cp()->is_conc_safe(), "Just checking");
+-
+- return JVMTI_ERROR_NONE;
+-} // end merge_cp_and_rewrite()
+-
+-
+-// Rewrite constant pool references in klass scratch_class.
+-bool VM_RedefineClasses::rewrite_cp_refs(instanceKlassHandle scratch_class,
+- TRAPS) {
+-
+- // rewrite constant pool references in the methods:
+- if (!rewrite_cp_refs_in_methods(scratch_class, THREAD)) {
+- // propagate failure back to caller
++}
++
++void VM_RedefineClasses::method_forwarding() {
++
++ int forwarding_count = 0;
++ JavaThread *java_thread = Threads::first();
++ while (java_thread != NULL) {
++
++ int stack_depth = 0;
++ if (java_thread->has_last_Java_frame()) {
++
++ RC_TRACE(0x00000400, ("checking stack of Java thread %s", java_thread->name()));
++
++ // vframes are resource allocated
++ Thread* current_thread = Thread::current();
++ ResourceMark rm(current_thread);
++ HandleMark hm(current_thread);
++
++ RegisterMap reg_map(java_thread);
++ frame f = java_thread->last_frame();
++ vframe* vf = vframe::new_vframe(&f, ®_map, java_thread);
++ frame* last_entry_frame = NULL;
++
++ while (vf != NULL) {
++ if (vf->is_java_frame()) {
++ // java frame (interpreted, compiled, ...)
++ javaVFrame *jvf = javaVFrame::cast(vf);
++
++ if (!(jvf->method()->is_native())) {
++ RC_TRACE(0x00008000, ("found method: %s",
++ jvf->method()->name()->as_C_string()));
++ ResourceMark rm(Thread::current());
++ HandleMark hm;
++ instanceKlassHandle klass(jvf->method()->method_holder());
++ methodOop m = jvf->method();
++ int bci = jvf->bci();
++ RC_TRACE(0x00008000, ("klass redef %d",
++ klass->is_redefining()));
++
++ if (klass->new_version() != NULL && m->new_version() == NULL) {
++ RC_TRACE(0x00008000, ("found potential forwarding method: %s",
++ m->name()->as_C_string()));
++
++ klassOop new_klass = klass->newest_version();
++ methodOop new_method = new_klass->klass_part()->lookup_method(m->name(), m->signature());
++ RC_TRACE(0x00000002, ("%d %d",
++ new_method,
++ new_method->constMethod()->has_code_section_table()));
++
++ if (new_method != NULL && new_method->constMethod()->has_code_section_table()) {
++ RC_TRACE(0x00008000, ("found code section table for method: %s",
++ new_method->name()->as_C_string()));
++ m->set_forward_method(new_method);
++ if (new_method->max_locals() != m->max_locals()) {
++ tty->print_cr("new_m max locals: %d old_m max locals: %d", new_method->max_locals(), m->max_locals());
++ }
++ assert(new_method->max_locals() == m->max_locals(), "number of locals must match");
++ assert(new_method->max_stack() == m->max_stack(), "number of stack values must match");
++ if (jvf->is_interpreted_frame()) {
++ if (m->is_in_code_section(bci)) {
++ // We must transfer now and cannot delay until next NOP.
++ int new_bci = m->calculate_forward_bci(bci, new_method);
++ interpretedVFrame* iframe = interpretedVFrame::cast(jvf);
++ RC_TRACE(0x00000002, ("Transferring execution of %s to new method old_bci=%d new_bci=%d",
++ new_method->name()->as_C_string(),
++ bci,
++ new_bci));
++ iframe->set_method(new_method, new_bci);
++ } else {
++ RC_TRACE(0x00000002, ("Delaying method forwarding of %s because %d is not in a code section",
++ new_method->name()->as_C_string(),
++ bci));
++ }
++ } else {
++ RC_TRACE(0x00000002, ("Delaying method forwarding of %s because method is compiled",
++ new_method->name()->as_C_string()));
++ }
++ }
++ }
++ }
++ }
++ vf = vf->sender();
++ }
++ }
++
++ // Advance to next thread
++ java_thread = java_thread->next();
++ }
++
++ RC_TRACE(0x00000001, ("Method forwarding applied to %d methods",
++ forwarding_count));
++}
++
++bool VM_RedefineClasses::check_method_stacks() {
++
++ JavaThread *java_thread = Threads::first();
++ while (java_thread != NULL) {
++
++ int stack_depth = 0;
++ if (java_thread->has_last_Java_frame()) {
++
++ RC_TRACE(0x00000400, ("checking stack of Java thread %s", java_thread->name()));
++
++ // vframes are resource allocated
++ Thread* current_thread = Thread::current();
++ ResourceMark rm(current_thread);
++ HandleMark hm(current_thread);
++
++ RegisterMap reg_map(java_thread);
++ frame f = java_thread->last_frame();
++ vframe* vf = vframe::new_vframe(&f, ®_map, java_thread);
++ frame* last_entry_frame = NULL;
++
++ while (vf != NULL) {
++ if (vf->is_java_frame()) {
++ // java frame (interpreted, compiled, ...)
++ javaVFrame *jvf = javaVFrame::cast(vf);
++
++ if (!(jvf->method()->is_native())) {
++ RC_TRACE(0x00000400, ("found method: %s", jvf->method()->name()->as_C_string()));
++ ResourceMark rm(Thread::current());
++ HandleMark hm;
++ instanceKlassHandle klass(jvf->method()->method_holder());
++
++ StackValueCollection *locals = jvf->locals();
++ const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
++ char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
++
++ for (int i=0; i<locals->size(); i++) {
++ StackValue *stack_value = locals->at(i);
++ if (stack_value->type() == T_OBJECT) {
++ Handle obj = stack_value->get_obj();
++ if (!obj.is_null() && obj->klass()->klass_part()->newest_version()->klass_part()->check_redefinition_flag(Klass::RemoveSuperType)) {
++
++ // OK, so this is a possible failure => check local variable table, if it could be OK.
++ bool result = false;
++ methodOop method = jvf->method();
++ if (method->has_localvariable_table()) {
++ LocalVariableTableElement *elem = jvf->method()->localvariable_table_start();
++ for (int j=0; j<method->localvariable_table_length(); j++) {
++
++ if (elem->slot == i) {
++
++ // Matching index found
++
++ if (elem->start_bci <= jvf->bci() && elem->start_bci + elem->length > jvf->bci()) {
++
++ // Also in range!!
++ Symbol* signature = jvf->method()->constants()->symbol_at(elem->descriptor_cp_index);
++ Symbol* klass_name = signature_to_class_name(signature);
++
++ klassOop local_klass = SystemDictionary::find(klass_name, jvf->method()->method_holder()->klass_part()->class_loader(), jvf->method()->method_holder()->klass_part()->protection_domain(), Thread::current())->klass_part()->newest_version();
++ klassOop cur = obj->klass()->klass_part()->newest_version();
++
++ // Field is not null
++ if (cur->klass_part()->newest_version()->klass_part()->is_subtype_of(local_klass)) {
++ // We are OK
++ RC_TRACE(0x00008000, ("Local variable value is OK (local_klass=%s, cur_klass=%s)",
++ local_klass->klass_part()->name()->as_C_string(), cur->klass_part()->name()->as_C_string()));
++ result = true;
++ } else {
++ // Failure!
++ RC_TRACE(0x00000001, ("Local variable value is INVALID - abort redefinition (local_klass=%s, cur_klass=%s)",
++ local_klass->klass_part()->name()->as_C_string(),
++ cur->klass_part()->name()->as_C_string()));
++ return false;
++ }
++ }
++ }
++
++ elem++;
++ }
++ } else {
++ RC_TRACE(0x00000002, ("Method %s does not have a local variable table => abort",
++ method->name_and_sig_as_C_string()));
++ }
++
++ if (!result) {
++ return false;
++ }
++
++ RC_TRACE(0x00008000, ("Verifying class %s",
++ jvf->method()->method_holder()->klass_part()->name()->as_C_string()));
++
++ Symbol* exception_name;
++ const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
++ char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
++
++ Thread::current()->set_pretend_new_universe(true);
++ ClassVerifier split_verifier(klass, Thread::current());
++ split_verifier.verify_method(jvf->method(), Thread::current());
++ exception_name = split_verifier.result();
++ Thread::current()->set_pretend_new_universe(false);
++
++ if (exception_name != NULL) {
++
++ RC_TRACE(0x00000001, ("Verification of class %s failed",
++ jvf->method()->method_holder()->klass_part()->name()->as_C_string()));
++ RC_TRACE(0x00000001, ("Exception: %s",
++ exception_name->as_C_string()));
++ RC_TRACE(0x00000001, ("Message: %s",
++ message_buffer));
++ Thread::current()->clear_pending_exception();
++ return false;
++ }
++
++ }
++ }
++ }
++ }
++ }
++ vf = vf->sender();
++ }
++ }
++
++ // Advance to next thread
++ java_thread = java_thread->next();
++ }
++
++ return true;
++}
++
++bool VM_RedefineClasses::check_method(methodOop method) {
++
++
++ return true;
++}
++
++// Warning: destroys redefinition level values of klasses.
++bool VM_RedefineClasses::check_loaded_methods() {
++
++ class CheckLoadedMethodsClosure : public ObjectClosure {
++
++ private:
++
++ bool _result;
++ GrowableArray<klassOop> *_dangerous_klasses;
++
++ public:
++ CheckLoadedMethodsClosure(GrowableArray<klassOop> *dangerous_klasses) {
++ _result = true;
++ _dangerous_klasses = dangerous_klasses;
++ }
++
++ bool result() {
++ return _result;
++ }
++
++ bool is_class_dangerous(klassOop k) {
++ return k->klass_part()->newest_version()->klass_part()->check_redefinition_flag(Klass::RemoveSuperType);
++ }
++
++ bool can_be_affected(instanceKlass *klass) {
++
++ constantPoolOop cp = klass->constants();
++
++ Thread *THREAD = Thread::current();
++ klassOop k;
++ Symbol* symbol;
++
++ for (int i=1; i<cp->length(); i++) {
++ jbyte tag = cp->tag_at(i).value();
++ switch(tag) {
++ case JVM_CONSTANT_Long:
++ case JVM_CONSTANT_Double:
++ i++;
++ break;
++
++ case JVM_CONSTANT_Utf8:
++ case JVM_CONSTANT_Unicode:
++ case JVM_CONSTANT_Integer:
++ case JVM_CONSTANT_Float:
++ case JVM_CONSTANT_String:
++ case JVM_CONSTANT_Fieldref:
++ case JVM_CONSTANT_Methodref:
++ case JVM_CONSTANT_InterfaceMethodref:
++ case JVM_CONSTANT_ClassIndex:
++ case JVM_CONSTANT_UnresolvedString:
++ case JVM_CONSTANT_StringIndex:
++ case JVM_CONSTANT_UnresolvedClassInError:
++ case JVM_CONSTANT_Object:
++ // do nothing
++ break;
++
++ case JVM_CONSTANT_Class:
++ k = cp->klass_at(i, CHECK_(true));
++ if (is_class_dangerous(k)) {
++ RC_TRACE(0x00000002, ("Class %s is potentially affected, because at cp[%d] references class %s",
++ klass->name()->as_C_string(),
++ i,
++ k->klass_part()->name()->as_C_string()));
++ return true;
++ }
++ break;
++
++ case JVM_CONSTANT_NameAndType:
++ symbol = cp->symbol_at(cp->signature_ref_index_at(i));
++ if (symbol->byte_at(0) == '(') {
++ // This must be a method
++ SignatureStream signatureStream(symbol);
++ while (true) {
++
++ if (signatureStream.is_array()) {
++ Symbol* cur_signature = signatureStream.as_symbol(Thread::current());
++ if (is_type_signature_dangerous(cur_signature)) {
++ return true;
++ }
++ } else if (signatureStream.is_object()) {
++ if (is_symbol_dangerous(signatureStream.as_symbol(Thread::current()))) {
++ return true;
++ }
++ }
++
++ if (signatureStream.at_return_type()) {
++ break;
++ }
++
++ signatureStream.next();
++ }
++
++ } else if (is_type_signature_dangerous(symbol)) {
++ return true;
++ }
++ break;
++
++ case JVM_CONSTANT_UnresolvedClass:
++ symbol = cp->unresolved_klass_at(i);
++ if (is_symbol_dangerous(symbol)) {
++ return true;
++ }
++ break;
++
++ default:
++ ShouldNotReachHere();
++ }
++ }
++
++ return false;
++ }
++
++ bool is_type_signature_dangerous(Symbol* signature) {
++ // This must be a field type
++ if (FieldType::is_obj(signature)) {
++ Symbol* name = signature_to_class_name(signature);
++ if (is_symbol_dangerous(name)) {
++ return true;
++ }
++ } else if (FieldType::is_array(signature)) {
++ //jint dimension;
++ //Symbol* object_key;
++ FieldArrayInfo fd;
++ FieldType::get_array_info(signature, fd, Thread::current());
++ if (is_symbol_dangerous(fd.object_key())) {
++ return true;
++ }
++ }
++ return false;
++ }
++
++ bool is_symbol_dangerous(Symbol* symbol) {
++ for (int i=0; i<_dangerous_klasses->length(); i++) {
++ if(_dangerous_klasses->at(i)->klass_part()->name() == symbol) {
++ RC_TRACE(0x00000002, ("Found constant pool index %d references class %s",
++ i,
++ symbol->as_C_string()));
++ return true;
++ }
++ }
++ return false;
++ }
++
++ virtual void do_object(oop obj) {
++
++ if (!_result) return;
++
++ klassOop klassObj = (klassOop)obj;
++ Thread *THREAD = Thread::current();
++
++ // We found an instance klass!
++ instanceKlass *klass = instanceKlass::cast(klassObj);
++ instanceKlassHandle handle(klassObj);
++
++ RC_TRACE(0x00000400, ("Check if verification is necessary for class %s major_version=%d", handle->name()->as_C_string(), handle->major_version()));
++
++ if (!can_be_affected(klass)) {
++ RC_TRACE(0x00000400, ("Skipping verification of class %s major_version=%d", handle->name()->as_C_string(), handle->major_version()));
++ return;
++ }
++
++ if (handle->major_version() < Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION) {
++ RC_TRACE(0x00000001, ("Failing because cannot verify class %s major_version=%d", handle->name()->as_C_string(), handle->major_version()));
++ _result = false;
++ return;
++ }
++
++ RC_TRACE(0x00000001, ("Verifying class %s", handle->name()->as_C_string()));
++
++ if (!Verifier::verify(handle, Verifier::NoException, true, false, Thread::current())) {
++
++ RC_TRACE(0x00000001, ("Verification of class %s failed", handle->name()->as_C_string()));
++ //Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
++ //RC_TRACE(0x00000002, ("exception when verifying class: '%s'", ex_name->as_C_string());
++ //PENDING_EXCEPTION->print();
++ CLEAR_PENDING_EXCEPTION;
++ _result = false;
++ }
++
++ /*int method_count = klass->methods()->length();
++ for (int i=0; i<method_count; i++) {
++ methodOop cur_method = (methodOop)klass->methods()->obj_at(i);
++ if (!check_method(cur_method)) {
++ RC_TRACE(0x00000001, ("Failed to verify consistency of method %s of klass %s", cur_method->name()->as_C_string(), klass->name()->as_C_string());
++ }
++ }*/
++ }
++ };
++
++ // TODO: Check bytecodes in case of interface => class or class => interface etc..
++
++ GrowableArray<klassOop> dangerous_klasses;
++ for (int i=0; i<_new_classes->length(); i++) {
++ instanceKlassHandle handle = _new_classes->at(i);
++ if (handle->check_redefinition_flag(Klass::RemoveSuperType)) {
++ dangerous_klasses.append(handle());
++ }
++ }
++
++ CheckLoadedMethodsClosure checkLoadedMethodsClosure(&dangerous_klasses);
++ Thread::current()->set_pretend_new_universe(true);
++ SystemDictionary::classes_do(&checkLoadedMethodsClosure);
++ Thread::current()->set_pretend_new_universe(false);
++
++
++ return checkLoadedMethodsClosure.result();
++}
++
++bool VM_RedefineClasses::check_type_consistency() {
++
++ Universe::set_verify_in_progress(true);
++
++ SystemDictionary::classes_do(calculate_type_check_information);
++ bool result = check_field_value_types();
++ SystemDictionary::classes_do(clear_type_check_information);
++ if (!result) {
++ RC_TRACE(0x00000001, ("Aborting redefinition because of wrong field or array element value!"));
++ Universe::set_verify_in_progress(false);
+ return false;
+ }
+
+- // rewrite constant pool references in the class_annotations:
+- if (!rewrite_cp_refs_in_class_annotations(scratch_class, THREAD)) {
+- // propagate failure back to caller
++ result = check_method_stacks();
++ if (!result) {
++ RC_TRACE(0x00000001, ("Aborting redefinition because of wrong value on the stack"));
++ Universe::set_verify_in_progress(false);
+ return false;
+ }
+
+- // rewrite constant pool references in the fields_annotations:
+- if (!rewrite_cp_refs_in_fields_annotations(scratch_class, THREAD)) {
+- // propagate failure back to caller
++ result = check_loaded_methods();
++ if (!result) {
++ RC_TRACE(0x00000001, ("Aborting redefinition because of wrong loaded method"));
++ Universe::set_verify_in_progress(false);
+ return false;
+ }
+
+- // rewrite constant pool references in the methods_annotations:
+- if (!rewrite_cp_refs_in_methods_annotations(scratch_class, THREAD)) {
+- // propagate failure back to caller
++ RC_TRACE(0x00000001, ("Verification passed => hierarchy change is valid!"));
++ Universe::set_verify_in_progress(false);
++ return true;
++}
++
++void VM_RedefineClasses::rollback() {
++ RC_TRACE(0x00000001, ("Rolling back redefinition!"));
++ SystemDictionary::rollback_redefinition();
++
++ RC_TRACE(0x00000001, ("After rolling back system dictionary!"));
++ for (int i=0; i<_new_classes->length(); i++) {
++ SystemDictionary::remove_from_hierarchy(_new_classes->at(i));
++ }
++
++ for (int i=0; i<_new_classes->length(); i++) {
++ instanceKlassHandle new_class = _new_classes->at(i);
++ new_class->set_redefining(false);
++ new_class->old_version()->klass_part()->set_new_version(NULL);
++ new_class->set_old_version(NULL);
++ }
++
++}
++
++template <class T> void VM_RedefineClasses::do_oop_work(T* p) {
++ T heap_oop = oopDesc::load_heap_oop(p);
++ if (!oopDesc::is_null(heap_oop)) {
++ oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
++ if (obj->is_instanceKlass()) {
++ klassOop klass = (klassOop)obj;
++ // DCEVM: note: can overwrite owner of old_klass constants pool with new_klass, so we need to fix it back later
++ if (klass->new_version() != NULL && klass->new_version()->klass_part()->is_redefining()) {
++ obj = klass->klass_part()->new_version();
++ oopDesc::encode_store_heap_oop_not_null(p, obj);
++ }
++ } else if (obj->blueprint()->newest_version() == SystemDictionary::Class_klass()->klass_part()->newest_version()) {
++ // update references to java.lang.Class to point to newest version. Only update references to non-primitive
++ // java.lang.Class instances.
++ klassOop klass_oop = java_lang_Class::as_klassOop(obj);
++ if (klass_oop != NULL) {
++ if (klass_oop->new_version() != NULL && klass_oop->new_version()->klass_part()->is_redefining()) {
++ obj = klass_oop->new_version()->java_mirror();
++ } else if (klass_oop->klass_part()->is_redefining()) {
++ obj = klass_oop->java_mirror();
++ }
++ oopDesc::encode_store_heap_oop_not_null(p, obj);
++
++
++ // FIXME: DCEVM: better implementation?
++ // Starting from JDK 7 java_mirror can be kept in the regular heap. Therefore, it is possible
++ // that new java_mirror is in the young generation whereas p is in tenured generation. In that
++ // case we need to run write barrier to make sure card table is properly updated. This will
++ // allow JVM to detect reference in tenured generation properly during young generation GC.
++ if (Universe::heap()->is_in_reserved(p)) {
++ if (GenCollectedHeap::heap()->is_in_young(obj)) {
++ GenRemSet* rs = GenCollectedHeap::heap()->rem_set();
++ assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind.");
++ CardTableRS* _rs = (CardTableRS*)rs;
++ _rs->inline_write_ref_field_gc(p, obj);
++ }
++ }
++ }
++ }
++ }
++}
++
++void VM_RedefineClasses::swap_marks(oop first, oop second) {
++ markOop first_mark = first->mark();
++ markOop second_mark = second->mark();
++ first->set_mark(second_mark);
++ second->set_mark(first_mark);
++}
++
++void VM_RedefineClasses::doit() {
++ Thread *thread = Thread::current();
++
++ RC_TRACE(0x00000001, ("Entering doit!"));
++
++
++ if ((_max_redefinition_flags & Klass::RemoveSuperType) != 0) {
++
++ RC_TIMER_START(_timer_check_type);
++
++ if (!check_type_consistency()) {
++ // (tw) TODO: Rollback the class redefinition
++ rollback();
++ RC_TRACE(0x00000001, ("Detected type inconsistency!"));
++ _result = JVMTI_ERROR_UNSUPPORTED_REDEFINITION_HIERARCHY_CHANGED;
++ RC_TIMER_STOP(_timer_check_type);
++ return;
++ }
++
++ RC_TIMER_STOP(_timer_check_type);
++
++ } else {
++ RC_TRACE(0x00000001, ("No type narrowing => skipping check for type inconsistency"));
++ }
++
++ if (UseMethodForwardPoints) {
++ RC_TRACE(0x00000001, ("Check stack for forwarding methods to new version"));
++ method_forwarding();
++ }
++
++ if (UseSharedSpaces) {
++ // Sharing is enabled so we remap the shared readonly space to
++ // shared readwrite, private just in case we need to redefine
++ // a shared class. We do the remap during the doit() phase of
++ // the safepoint to be safer.
++ if (!CompactingPermGenGen::remap_shared_readonly_as_readwrite()) {
++ RC_TRACE(0x00000001, ("failed to remap shared readonly space to readwrite, private"));
++ _result = JVMTI_ERROR_INTERNAL;
++ return;
++ }
++ }
++
++ RC_TIMER_START(_timer_prepare_redefinition);
++ for (int i = 0; i < _new_classes->length(); i++) {
++ redefine_single_class(_new_classes->at(i), thread);
++ }
++
++ // Deoptimize all compiled code that depends on this class
++ flush_dependent_code(instanceKlassHandle(Thread::current(), (klassOop)NULL), Thread::current());
++
++ // Adjust constantpool caches and vtables for all classes
++ // that reference methods of the evolved class.
++ SystemDictionary::classes_do(adjust_cpool_cache, Thread::current());
++
++ RC_TIMER_STOP(_timer_prepare_redefinition);
++ RC_TIMER_START(_timer_redefinition);
++
++ class ChangePointersOopClosure : public OopClosure {
++ virtual void do_oop(oop* o) {
++ do_oop_work(o);
++ }
++
++ virtual void do_oop(narrowOop* o) {
++ do_oop_work(o);
++ }
++ };
++
++ class ChangePointersObjectClosure : public ObjectClosure {
++
++ private:
++
++ OopClosure *_closure;
++ bool _needs_instance_update;
++ GrowableArray<oop> *_updated_oops;
++
++ public:
++ ChangePointersObjectClosure(OopClosure *closure) : _closure(closure), _needs_instance_update(false), _updated_oops(NULL) {}
++
++ bool needs_instance_update() {
++ return _needs_instance_update;
++ }
++
++ GrowableArray<oop> *updated_oops() { return _updated_oops; }
++
++ virtual void do_object(oop obj) {
++ if (!obj->is_instanceKlass()) {
++ obj->oop_iterate(_closure);
++
++ if (obj->blueprint()->is_redefining()) {
++
++ if (obj->blueprint()->check_redefinition_flag(Klass::HasInstanceTransformer)) {
++ if (_updated_oops == NULL) {
++ _updated_oops = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(100, true);
++ }
++ _updated_oops->append(obj);
++ }
++
++ if(obj->blueprint()->update_information() != NULL || obj->is_perm()) {
++
++ assert(obj->blueprint()->old_version() != NULL, "must have old version");
++ obj->set_klass_no_check(obj->blueprint()->old_version());
++
++ if (obj->size() != obj->size_given_klass(obj->blueprint()->new_version()->klass_part()) || obj->is_perm()) {
++ // We need an instance update => set back to old klass
++ _needs_instance_update = true;
++
++ } else {
++ MarkSweep::update_fields(obj, obj);
++ assert(obj->blueprint()->is_redefining(), "update fields resets the klass");
++ }
++ }
++ }
++
++ } else {
++ instanceKlass *klass = instanceKlass::cast((klassOop)obj);
++ if (klass->is_redefining()) {
++ // DCEVM: We need to restorte constants pool owner which was updated by do_oop_work
++ instanceKlass* old_klass = instanceKlass::cast(klass->old_version());
++ old_klass->constants()->set_pool_holder(klass->old_version());
++
++ // Initialize the new class! Special static initialization that does not execute the
++ // static constructor but copies static field values from the old class if name
++ // and signature of a static field match.
++ klass->initialize_redefined_class();
++ }
++ // idubrov: FIXME: we probably don't need that since oop's will be visited in a regular way...
++ // idubrov: need to check if there is a test to verify that fields referencing class being updated
++ // idubrov: will get new version of that class
++ //klass->iterate_static_fields(_closure);
++ }
++ }
++ };
++
++ ChangePointersOopClosure oopClosure;
++ ChangePointersObjectClosure objectClosure(&oopClosure);
++
++ {
++ SharedHeap::heap()->gc_prologue(true);
++ Universe::root_oops_do(&oopClosure);
++ Universe::heap()->object_iterate(&objectClosure);
++ SharedHeap::heap()->gc_epilogue(false);
++ }
++
++ // Swap marks to have same hashcodes
++ for (int i=0; i<_new_classes->length(); i++) {
++ swap_marks(_new_classes->at(i)(), _new_classes->at(i)->old_version());
++ swap_marks(_new_classes->at(i)->java_mirror(), _new_classes->at(i)->old_version()->java_mirror());
++ }
++
++ _updated_oops = objectClosure.updated_oops();
++
++ if (objectClosure.needs_instance_update()){
++
++ // Do a full garbage collection to update the instance sizes accordingly
++ RC_TRACE(0x00000001, ("Before performing full GC!"));
++ Universe::set_redefining_gc_run(true);
++ JvmtiGCMarker jgcm;
++ notify_gc_begin(true);
++ Universe::heap()->collect_as_vm_thread(GCCause::_heap_inspection);
++ notify_gc_end();
++ Universe::set_redefining_gc_run(false);
++ RC_TRACE(0x00000001, ("GC done!"));
++ }
++
++
++ if (RC_TRACE_ENABLED(0x00000001)) {
++ if (_updated_oops != NULL) {
++ RC_TRACE(0x00000001, ("%d object(s) updated!", _updated_oops->length()));
++ } else {
++ RC_TRACE(0x00000001, ("No objects updated!"));
++ }
++ }
++
++ // Unmark klassOops as "redefining"
++ for (int i=0; i<_new_classes->length(); i++) {
++ klassOop cur = _new_classes->at(i)();
++ _new_classes->at(i)->set_redefining(false);
++ _new_classes->at(i)->clear_update_information();
++ _new_classes->at(i)->update_supers_to_newest_version();
++
++ if (((instanceKlass *)cur->klass_part()->old_version()->klass_part())->array_klasses() != NULL) {
++ update_array_classes_to_newest_version(((instanceKlass *)cur->klass_part()->old_version()->klass_part())->array_klasses());
++
++ // Transfer the array classes, otherwise we might get cast exceptions when casting array types.
++ ((instanceKlass*)cur->klass_part())->set_array_klasses(((instanceKlass*)cur->klass_part()->old_version()->klass_part())->array_klasses());
++
++ oop new_mirror = _new_classes->at(i)->java_mirror();
++ oop old_mirror = _new_classes->at(i)->old_version()->java_mirror();
++ java_lang_Class::set_array_klass(new_mirror, java_lang_Class::array_klass(old_mirror));
++ }
++ }
++
++ for (int i=T_BOOLEAN; i<=T_LONG; i++) {
++ update_array_classes_to_newest_version(Universe::typeArrayKlassObj((BasicType)i));
++ }
++
++ // Disable any dependent concurrent compilations
++ SystemDictionary::notice_modification();
++
++ // Set flag indicating that some invariants are no longer true.
++ // See jvmtiExport.hpp for detailed explanation.
++ JvmtiExport::set_has_redefined_a_class();
++
++ // Clean up caches in the compiler interface and compiler threads
++ CompileBroker::cleanup_after_redefinition();
++
++#ifdef ASSERT
++
++ // Universe::verify();
++ // JNIHandles::verify();
++
++ SystemDictionary::classes_do(check_class, thread);
++#endif
++
++ update_active_methods();
++ RC_TIMER_STOP(_timer_redefinition);
++
++}
++
++void VM_RedefineClasses::update_array_classes_to_newest_version(klassOop smallest_dimension) {
++
++ arrayKlass *curArrayKlass = arrayKlass::cast(smallest_dimension);
++ assert(curArrayKlass->lower_dimension() == NULL, "argument must be smallest dimension");
++
++
++ while (curArrayKlass != NULL) {
++ klassOop higher_dimension = curArrayKlass->higher_dimension();
++ klassOop lower_dimension = curArrayKlass->lower_dimension();
++ curArrayKlass->update_supers_to_newest_version();
++
++ curArrayKlass = NULL;
++ if (higher_dimension != NULL) {
++ curArrayKlass = arrayKlass::cast(higher_dimension);
++ }
++ }
++
++}
++
++void VM_RedefineClasses::doit_epilogue() {
++
++ RC_TIMER_START(_timer_vm_op_epilogue);
++
++ unlock_threads();
++
++ ResourceMark mark;
++
++ VM_GC_Operation::doit_epilogue();
++ RC_TRACE(0x00000001, ("GC Operation epilogue finished! "));
++
++ GrowableArray<methodHandle> instanceTransformerMethods;
++
++ // Call static transformers
++ for (int i=0; i<_new_classes->length(); i++) {
++
++ instanceKlassHandle klass = _new_classes->at(i);
++
++ // Transfer init state
++ if (klass->old_version() != NULL) {
++ instanceKlass::ClassState state = instanceKlass::cast(klass->old_version())->init_state();
++ if (state > instanceKlass::linked) {
++ klass->initialize(Thread::current());
++ }
++ }
++
++ // Find instance transformer method
++
++ if (klass->check_redefinition_flag(Klass::HasInstanceTransformer)) {
++
++ RC_TRACE(0x00008000, ("Call instance transformer of %s instance", klass->name()->as_C_string()));
++ klassOop cur_klass = klass();
++ while (cur_klass != NULL) {
++ methodOop method = ((instanceKlass*)cur_klass->klass_part())->find_method(vmSymbols::transformer_name(), vmSymbols::void_method_signature());
++ if (method != NULL) {
++ methodHandle instanceTransformerMethod(method);
++ instanceTransformerMethods.append(instanceTransformerMethod);
++ break;
++ } else {
++ cur_klass = cur_klass->klass_part()->super();
++ }
++ }
++ assert(cur_klass != NULL, "must have instance transformer method");
++ } else {
++ instanceTransformerMethods.append(methodHandle(Thread::current(), NULL));
++ }
++ }
++
++
++ // Call instance transformers
++ if (_updated_oops != NULL) {
++
++ for (int i=0; i<_updated_oops->length(); i++) {
++ assert(_updated_oops->at(i) != NULL, "must not be null!");
++ Handle cur(_updated_oops->at(i));
++ instanceKlassHandle klass(cur->klass());
++
++ if (klass->check_redefinition_flag(Klass::HasInstanceTransformer)) {
++
++ methodHandle method = instanceTransformerMethods.at(klass->redefinition_index());
++
++ RC_TRACE(0x00008000, ("executing transformer method"));
++
++ Thread *__the_thread__ = Thread::current();
++ JavaValue result(T_VOID);
++ JavaCallArguments args(cur);
++ JavaCalls::call(&result,
++ method,
++ &args,
++ THREAD);
++
++ // TODO: What to do with an exception here?
++ if (HAS_PENDING_EXCEPTION) {
++ Symbol* ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
++ RC_TRACE(0x00000002, ("exception when executing transformer: '%s'",
++ ex_name->as_C_string()));
++ CLEAR_PENDING_EXCEPTION;
++ }
++ }
++ }
++
++ delete _updated_oops;
++ _updated_oops = NULL;
++ }
++
++ // Free the array of scratch classes
++ delete _new_classes;
++ _new_classes = NULL;
++ RC_TRACE(0x00000001, ("Redefinition finished!"));
++
++ RC_TIMER_STOP(_timer_vm_op_epilogue);
++}
++
++bool VM_RedefineClasses::is_modifiable_class(oop klass_mirror) {
++ // classes for primitives cannot be redefined
++ if (java_lang_Class::is_primitive(klass_mirror)) {
+ return false;
+ }
+-
+- // rewrite constant pool references in the methods_parameter_annotations:
+- if (!rewrite_cp_refs_in_methods_parameter_annotations(scratch_class,
+- THREAD)) {
+- // propagate failure back to caller
++ klassOop the_class_oop = java_lang_Class::as_klassOop(klass_mirror);
++ // classes for arrays cannot be redefined
++ if (the_class_oop == NULL || !Klass::cast(the_class_oop)->oop_is_instance()) {
+ return false;
+ }
+-
+- // rewrite constant pool references in the methods_default_annotations:
+- if (!rewrite_cp_refs_in_methods_default_annotations(scratch_class,
+- THREAD)) {
+- // propagate failure back to caller
+- return false;
++ return true;
++}
++
++#ifdef ASSERT
++
++void VM_RedefineClasses::verify_classes(klassOop k_oop_latest, oop initiating_loader, TRAPS) {
++ klassOop k_oop = k_oop_latest;
++ while (k_oop != NULL) {
++
++ instanceKlassHandle k_handle(THREAD, k_oop);
++ Verifier::verify(k_handle, Verifier::ThrowException, true, true, THREAD);
++ k_oop = k_oop->klass_part()->old_version();
+ }
+-
+- return true;
+-} // end rewrite_cp_refs()
+-
+-
+-// Rewrite constant pool references in the methods.
+-bool VM_RedefineClasses::rewrite_cp_refs_in_methods(
+- instanceKlassHandle scratch_class, TRAPS) {
+-
+- objArrayHandle methods(THREAD, scratch_class->methods());
+-
+- if (methods.is_null() || methods->length() == 0) {
+- // no methods so nothing to do
+- return true;
+- }
+-
+- // rewrite constant pool references in the methods:
+- for (int i = methods->length() - 1; i >= 0; i--) {
+- methodHandle method(THREAD, (methodOop)methods->obj_at(i));
+- methodHandle new_method;
+- rewrite_cp_refs_in_method(method, &new_method, CHECK_false);
+- if (!new_method.is_null()) {
+- // the method has been replaced so save the new method version
+- methods->obj_at_put(i, new_method());
++}
++
++#endif
++
++// Rewrite faster byte-codes back to their slower equivalent. Undoes rewriting happening in templateTable_xxx.cpp
++// The reason is that once we zero cpool caches, we need to re-resolve all entries again. Faster bytecodes do not
++// do that, they assume that cache entry is resolved already.
++static void unpatch_bytecode(methodOop method) {
++ RawBytecodeStream bcs(method);
++ Bytecodes::Code code;
++ Bytecodes::Code java_code;
++ while (!bcs.is_last_bytecode()) {
++ code = bcs.raw_next();
++ address bcp = bcs.bcp();
++
++ if (code == Bytecodes::_breakpoint) {
++ int bci = method->bci_from(bcp);
++ code = method->orig_bytecode_at(bci);
++ java_code = Bytecodes::java_code(code);
++ if (code != java_code &&
++ (java_code == Bytecodes::_getfield ||
++ java_code == Bytecodes::_putfield ||
++ java_code == Bytecodes::_aload_0)) {
++ // Let breakpoint table handling unpatch bytecode
++ method->set_orig_bytecode_at(bci, java_code);
++ }
++ } else {
++ java_code = Bytecodes::java_code(code);
++ if (code != java_code &&
++ (java_code == Bytecodes::_getfield ||
++ java_code == Bytecodes::_putfield ||
++ java_code == Bytecodes::_aload_0)) {
++ *bcp = java_code;
++ }
++ }
++
++ // Additionally, we need to unpatch bytecode at bcp+1 for fast_xaccess (which would be fast field access)
++ if (code == Bytecodes::_fast_iaccess_0 || code == Bytecodes::_fast_aaccess_0 || code == Bytecodes::_fast_faccess_0) {
++ Bytecodes::Code code2 = Bytecodes::code_or_bp_at(bcp + 1);
++ assert(code2 == Bytecodes::_fast_igetfield ||
++ code2 == Bytecodes::_fast_agetfield ||
++ code2 == Bytecodes::_fast_fgetfield, "");
++ *(bcp + 1) = Bytecodes::java_code(code2);
+ }
+ }
+-
+- return true;
+ }
+
+-
+-// Rewrite constant pool references in the specific method. This code
+-// was adapted from Rewriter::rewrite_method().
+-void VM_RedefineClasses::rewrite_cp_refs_in_method(methodHandle method,
+- methodHandle *new_method_p, TRAPS) {
+-
+- *new_method_p = methodHandle(); // default is no new method
+-
+- // We cache a pointer to the bytecodes here in code_base. If GC
+- // moves the methodOop, then the bytecodes will also move which
+- // will likely cause a crash. We create a No_Safepoint_Verifier
+- // object to detect whether we pass a possible safepoint in this
+- // code block.
+- No_Safepoint_Verifier nsv;
+-
+- // Bytecodes and their length
+- address code_base = method->code_base();
+- int code_length = method->code_size();
+-
+- int bc_length;
+- for (int bci = 0; bci < code_length; bci += bc_length) {
+- address bcp = code_base + bci;
+- Bytecodes::Code c = (Bytecodes::Code)(*bcp);
+-
+- bc_length = Bytecodes::length_for(c);
+- if (bc_length == 0) {
+- // More complicated bytecodes report a length of zero so
+- // we have to try again a slightly different way.
+- bc_length = Bytecodes::length_at(method(), bcp);
+- }
+-
+- assert(bc_length != 0, "impossible bytecode length");
+-
+- switch (c) {
+- case Bytecodes::_ldc:
+- {
+- int cp_index = *(bcp + 1);
+- int new_index = find_new_index(cp_index);
+-
+- if (StressLdcRewrite && new_index == 0) {
+- // If we are stressing ldc -> ldc_w rewriting, then we
+- // always need a new_index value.
+- new_index = cp_index;
+- }
+- if (new_index != 0) {
+- // the original index is mapped so we have more work to do
+- if (!StressLdcRewrite && new_index <= max_jubyte) {
+- // The new value can still use ldc instead of ldc_w
+- // unless we are trying to stress ldc -> ldc_w rewriting
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("%s@" INTPTR_FORMAT " old=%d, new=%d", Bytecodes::name(c),
+- bcp, cp_index, new_index));
+- *(bcp + 1) = new_index;
+- } else {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("%s->ldc_w@" INTPTR_FORMAT " old=%d, new=%d",
+- Bytecodes::name(c), bcp, cp_index, new_index));
+- // the new value needs ldc_w instead of ldc
+- u_char inst_buffer[4]; // max instruction size is 4 bytes
+- bcp = (address)inst_buffer;
+- // construct new instruction sequence
+- *bcp = Bytecodes::_ldc_w;
+- bcp++;
+- // Rewriter::rewrite_method() does not rewrite ldc -> ldc_w.
+- // See comment below for difference between put_Java_u2()
+- // and put_native_u2().
+- Bytes::put_Java_u2(bcp, new_index);
+-
+- Relocator rc(method, NULL /* no RelocatorListener needed */);
+- methodHandle m;
+- {
+- Pause_No_Safepoint_Verifier pnsv(&nsv);
+-
+- // ldc is 2 bytes and ldc_w is 3 bytes
+- m = rc.insert_space_at(bci, 3, inst_buffer, THREAD);
+- if (m.is_null() || HAS_PENDING_EXCEPTION) {
+- guarantee(false, "insert_space_at() failed");
+- }
+- }
+-
+- // return the new method so that the caller can update
+- // the containing class
+- *new_method_p = method = m;
+- // switch our bytecode processing loop from the old method
+- // to the new method
+- code_base = method->code_base();
+- code_length = method->code_size();
+- bcp = code_base + bci;
+- c = (Bytecodes::Code)(*bcp);
+- bc_length = Bytecodes::length_for(c);
+- assert(bc_length != 0, "sanity check");
+- } // end we need ldc_w instead of ldc
+- } // end if there is a mapped index
+- } break;
+-
+- // these bytecodes have a two-byte constant pool index
+- case Bytecodes::_anewarray : // fall through
+- case Bytecodes::_checkcast : // fall through
+- case Bytecodes::_getfield : // fall through
+- case Bytecodes::_getstatic : // fall through
+- case Bytecodes::_instanceof : // fall through
+- case Bytecodes::_invokedynamic : // fall through
+- case Bytecodes::_invokeinterface: // fall through
+- case Bytecodes::_invokespecial : // fall through
+- case Bytecodes::_invokestatic : // fall through
+- case Bytecodes::_invokevirtual : // fall through
+- case Bytecodes::_ldc_w : // fall through
+- case Bytecodes::_ldc2_w : // fall through
+- case Bytecodes::_multianewarray : // fall through
+- case Bytecodes::_new : // fall through
+- case Bytecodes::_putfield : // fall through
+- case Bytecodes::_putstatic :
+- {
+- address p = bcp + 1;
+- int cp_index = Bytes::get_Java_u2(p);
+- int new_index = find_new_index(cp_index);
+- if (new_index != 0) {
+- // the original index is mapped so update w/ new value
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("%s@" INTPTR_FORMAT " old=%d, new=%d", Bytecodes::name(c),
+- bcp, cp_index, new_index));
+- // Rewriter::rewrite_method() uses put_native_u2() in this
+- // situation because it is reusing the constant pool index
+- // location for a native index into the constantPoolCache.
+- // Since we are updating the constant pool index prior to
+- // verification and constantPoolCache initialization, we
+- // need to keep the new index in Java byte order.
+- Bytes::put_Java_u2(p, new_index);
+- }
+- } break;
+- }
+- } // end for each bytecode
+-} // end rewrite_cp_refs_in_method()
+-
+-
+-// Rewrite constant pool references in the class_annotations field.
+-bool VM_RedefineClasses::rewrite_cp_refs_in_class_annotations(
+- instanceKlassHandle scratch_class, TRAPS) {
+-
+- typeArrayHandle class_annotations(THREAD,
+- scratch_class->class_annotations());
+- if (class_annotations.is_null() || class_annotations->length() == 0) {
+- // no class_annotations so nothing to do
+- return true;
+- }
+-
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("class_annotations length=%d", class_annotations->length()));
+-
+- int byte_i = 0; // byte index into class_annotations
+- return rewrite_cp_refs_in_annotations_typeArray(class_annotations, byte_i,
+- THREAD);
+-}
+-
+-
+-// Rewrite constant pool references in an annotations typeArray. This
+-// "structure" is adapted from the RuntimeVisibleAnnotations_attribute
+-// that is described in section 4.8.15 of the 2nd-edition of the VM spec:
+-//
+-// annotations_typeArray {
+-// u2 num_annotations;
+-// annotation annotations[num_annotations];
+-// }
+-//
+-bool VM_RedefineClasses::rewrite_cp_refs_in_annotations_typeArray(
+- typeArrayHandle annotations_typeArray, int &byte_i_ref, TRAPS) {
+-
+- if ((byte_i_ref + 2) > annotations_typeArray->length()) {
+- // not enough room for num_annotations field
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("length() is too small for num_annotations field"));
+- return false;
+- }
+-
+- u2 num_annotations = Bytes::get_Java_u2((address)
+- annotations_typeArray->byte_at_addr(byte_i_ref));
+- byte_i_ref += 2;
+-
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("num_annotations=%d", num_annotations));
+-
+- int calc_num_annotations = 0;
+- for (; calc_num_annotations < num_annotations; calc_num_annotations++) {
+- if (!rewrite_cp_refs_in_annotation_struct(annotations_typeArray,
+- byte_i_ref, THREAD)) {
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("bad annotation_struct at %d", calc_num_annotations));
+- // propagate failure back to caller
+- return false;
+- }
+- }
+- assert(num_annotations == calc_num_annotations, "sanity check");
+-
+- return true;
+-} // end rewrite_cp_refs_in_annotations_typeArray()
+-
+-
+-// Rewrite constant pool references in the annotation struct portion of
+-// an annotations_typeArray. This "structure" is from section 4.8.15 of
+-// the 2nd-edition of the VM spec:
+-//
+-// struct annotation {
+-// u2 type_index;
+-// u2 num_element_value_pairs;
+-// {
+-// u2 element_name_index;
+-// element_value value;
+-// } element_value_pairs[num_element_value_pairs];
+-// }
+-//
+-bool VM_RedefineClasses::rewrite_cp_refs_in_annotation_struct(
+- typeArrayHandle annotations_typeArray, int &byte_i_ref, TRAPS) {
+- if ((byte_i_ref + 2 + 2) > annotations_typeArray->length()) {
+- // not enough room for smallest annotation_struct
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("length() is too small for annotation_struct"));
+- return false;
+- }
+-
+- u2 type_index = rewrite_cp_ref_in_annotation_data(annotations_typeArray,
+- byte_i_ref, "mapped old type_index=%d", THREAD);
+-
+- u2 num_element_value_pairs = Bytes::get_Java_u2((address)
+- annotations_typeArray->byte_at_addr(
+- byte_i_ref));
+- byte_i_ref += 2;
+-
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("type_index=%d num_element_value_pairs=%d", type_index,
+- num_element_value_pairs));
+-
+- int calc_num_element_value_pairs = 0;
+- for (; calc_num_element_value_pairs < num_element_value_pairs;
+- calc_num_element_value_pairs++) {
+- if ((byte_i_ref + 2) > annotations_typeArray->length()) {
+- // not enough room for another element_name_index, let alone
+- // the rest of another component
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("length() is too small for element_name_index"));
+- return false;
+- }
+-
+- u2 element_name_index = rewrite_cp_ref_in_annotation_data(
+- annotations_typeArray, byte_i_ref,
+- "mapped old element_name_index=%d", THREAD);
+-
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("element_name_index=%d", element_name_index));
+-
+- if (!rewrite_cp_refs_in_element_value(annotations_typeArray,
+- byte_i_ref, THREAD)) {
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("bad element_value at %d", calc_num_element_value_pairs));
+- // propagate failure back to caller
+- return false;
+- }
+- } // end for each component
+- assert(num_element_value_pairs == calc_num_element_value_pairs,
+- "sanity check");
+-
+- return true;
+-} // end rewrite_cp_refs_in_annotation_struct()
+-
+-
+-// Rewrite a constant pool reference at the current position in
+-// annotations_typeArray if needed. Returns the original constant
+-// pool reference if a rewrite was not needed or the new constant
+-// pool reference if a rewrite was needed.
+-u2 VM_RedefineClasses::rewrite_cp_ref_in_annotation_data(
+- typeArrayHandle annotations_typeArray, int &byte_i_ref,
+- const char * trace_mesg, TRAPS) {
+-
+- address cp_index_addr = (address)
+- annotations_typeArray->byte_at_addr(byte_i_ref);
+- u2 old_cp_index = Bytes::get_Java_u2(cp_index_addr);
+- u2 new_cp_index = find_new_index(old_cp_index);
+- if (new_cp_index != 0) {
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD, (trace_mesg, old_cp_index));
+- Bytes::put_Java_u2(cp_index_addr, new_cp_index);
+- old_cp_index = new_cp_index;
+- }
+- byte_i_ref += 2;
+- return old_cp_index;
+-}
+-
+-
+-// Rewrite constant pool references in the element_value portion of an
+-// annotations_typeArray. This "structure" is from section 4.8.15.1 of
+-// the 2nd-edition of the VM spec:
+-//
+-// struct element_value {
+-// u1 tag;
+-// union {
+-// u2 const_value_index;
+-// {
+-// u2 type_name_index;
+-// u2 const_name_index;
+-// } enum_const_value;
+-// u2 class_info_index;
+-// annotation annotation_value;
+-// struct {
+-// u2 num_values;
+-// element_value values[num_values];
+-// } array_value;
+-// } value;
+-// }
+-//
+-bool VM_RedefineClasses::rewrite_cp_refs_in_element_value(
+- typeArrayHandle annotations_typeArray, int &byte_i_ref, TRAPS) {
+-
+- if ((byte_i_ref + 1) > annotations_typeArray->length()) {
+- // not enough room for a tag let alone the rest of an element_value
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("length() is too small for a tag"));
+- return false;
+- }
+-
+- u1 tag = annotations_typeArray->byte_at(byte_i_ref);
+- byte_i_ref++;
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("tag='%c'", tag));
+-
+- switch (tag) {
+- // These BaseType tag values are from Table 4.2 in VM spec:
+- case 'B': // byte
+- case 'C': // char
+- case 'D': // double
+- case 'F': // float
+- case 'I': // int
+- case 'J': // long
+- case 'S': // short
+- case 'Z': // boolean
+-
+- // The remaining tag values are from Table 4.8 in the 2nd-edition of
+- // the VM spec:
+- case 's':
+- {
+- // For the above tag values (including the BaseType values),
+- // value.const_value_index is right union field.
+-
+- if ((byte_i_ref + 2) > annotations_typeArray->length()) {
+- // not enough room for a const_value_index
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("length() is too small for a const_value_index"));
+- return false;
+- }
+-
+- u2 const_value_index = rewrite_cp_ref_in_annotation_data(
+- annotations_typeArray, byte_i_ref,
+- "mapped old const_value_index=%d", THREAD);
+-
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("const_value_index=%d", const_value_index));
+- } break;
+-
+- case 'e':
+- {
+- // for the above tag value, value.enum_const_value is right union field
+-
+- if ((byte_i_ref + 4) > annotations_typeArray->length()) {
+- // not enough room for a enum_const_value
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("length() is too small for a enum_const_value"));
+- return false;
+- }
+-
+- u2 type_name_index = rewrite_cp_ref_in_annotation_data(
+- annotations_typeArray, byte_i_ref,
+- "mapped old type_name_index=%d", THREAD);
+-
+- u2 const_name_index = rewrite_cp_ref_in_annotation_data(
+- annotations_typeArray, byte_i_ref,
+- "mapped old const_name_index=%d", THREAD);
+-
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("type_name_index=%d const_name_index=%d", type_name_index,
+- const_name_index));
+- } break;
+-
+- case 'c':
+- {
+- // for the above tag value, value.class_info_index is right union field
+-
+- if ((byte_i_ref + 2) > annotations_typeArray->length()) {
+- // not enough room for a class_info_index
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("length() is too small for a class_info_index"));
+- return false;
+- }
+-
+- u2 class_info_index = rewrite_cp_ref_in_annotation_data(
+- annotations_typeArray, byte_i_ref,
+- "mapped old class_info_index=%d", THREAD);
+-
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("class_info_index=%d", class_info_index));
+- } break;
+-
+- case '@':
+- // For the above tag value, value.attr_value is the right union
+- // field. This is a nested annotation.
+- if (!rewrite_cp_refs_in_annotation_struct(annotations_typeArray,
+- byte_i_ref, THREAD)) {
+- // propagate failure back to caller
+- return false;
+- }
+- break;
+-
+- case '[':
+- {
+- if ((byte_i_ref + 2) > annotations_typeArray->length()) {
+- // not enough room for a num_values field
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("length() is too small for a num_values field"));
+- return false;
+- }
+-
+- // For the above tag value, value.array_value is the right union
+- // field. This is an array of nested element_value.
+- u2 num_values = Bytes::get_Java_u2((address)
+- annotations_typeArray->byte_at_addr(byte_i_ref));
+- byte_i_ref += 2;
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("num_values=%d", num_values));
+-
+- int calc_num_values = 0;
+- for (; calc_num_values < num_values; calc_num_values++) {
+- if (!rewrite_cp_refs_in_element_value(
+- annotations_typeArray, byte_i_ref, THREAD)) {
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("bad nested element_value at %d", calc_num_values));
+- // propagate failure back to caller
+- return false;
+- }
+- }
+- assert(num_values == calc_num_values, "sanity check");
+- } break;
+-
+- default:
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD, ("bad tag=0x%x", tag));
+- return false;
+- } // end decode tag field
+-
+- return true;
+-} // end rewrite_cp_refs_in_element_value()
+-
+-
+-// Rewrite constant pool references in a fields_annotations field.
+-bool VM_RedefineClasses::rewrite_cp_refs_in_fields_annotations(
+- instanceKlassHandle scratch_class, TRAPS) {
+-
+- objArrayHandle fields_annotations(THREAD,
+- scratch_class->fields_annotations());
+-
+- if (fields_annotations.is_null() || fields_annotations->length() == 0) {
+- // no fields_annotations so nothing to do
+- return true;
+- }
+-
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("fields_annotations length=%d", fields_annotations->length()));
+-
+- for (int i = 0; i < fields_annotations->length(); i++) {
+- typeArrayHandle field_annotations(THREAD,
+- (typeArrayOop)fields_annotations->obj_at(i));
+- if (field_annotations.is_null() || field_annotations->length() == 0) {
+- // this field does not have any annotations so skip it
+- continue;
+- }
+-
+- int byte_i = 0; // byte index into field_annotations
+- if (!rewrite_cp_refs_in_annotations_typeArray(field_annotations, byte_i,
+- THREAD)) {
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("bad field_annotations at %d", i));
+- // propagate failure back to caller
+- return false;
+- }
+- }
+-
+- return true;
+-} // end rewrite_cp_refs_in_fields_annotations()
+-
+-
+-// Rewrite constant pool references in a methods_annotations field.
+-bool VM_RedefineClasses::rewrite_cp_refs_in_methods_annotations(
+- instanceKlassHandle scratch_class, TRAPS) {
+-
+- objArrayHandle methods_annotations(THREAD,
+- scratch_class->methods_annotations());
+-
+- if (methods_annotations.is_null() || methods_annotations->length() == 0) {
+- // no methods_annotations so nothing to do
+- return true;
+- }
+-
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("methods_annotations length=%d", methods_annotations->length()));
+-
+- for (int i = 0; i < methods_annotations->length(); i++) {
+- typeArrayHandle method_annotations(THREAD,
+- (typeArrayOop)methods_annotations->obj_at(i));
+- if (method_annotations.is_null() || method_annotations->length() == 0) {
+- // this method does not have any annotations so skip it
+- continue;
+- }
+-
+- int byte_i = 0; // byte index into method_annotations
+- if (!rewrite_cp_refs_in_annotations_typeArray(method_annotations, byte_i,
+- THREAD)) {
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("bad method_annotations at %d", i));
+- // propagate failure back to caller
+- return false;
+- }
+- }
+-
+- return true;
+-} // end rewrite_cp_refs_in_methods_annotations()
+-
+-
+-// Rewrite constant pool references in a methods_parameter_annotations
+-// field. This "structure" is adapted from the
+-// RuntimeVisibleParameterAnnotations_attribute described in section
+-// 4.8.17 of the 2nd-edition of the VM spec:
+-//
+-// methods_parameter_annotations_typeArray {
+-// u1 num_parameters;
+-// {
+-// u2 num_annotations;
+-// annotation annotations[num_annotations];
+-// } parameter_annotations[num_parameters];
+-// }
+-//
+-bool VM_RedefineClasses::rewrite_cp_refs_in_methods_parameter_annotations(
+- instanceKlassHandle scratch_class, TRAPS) {
+-
+- objArrayHandle methods_parameter_annotations(THREAD,
+- scratch_class->methods_parameter_annotations());
+-
+- if (methods_parameter_annotations.is_null()
+- || methods_parameter_annotations->length() == 0) {
+- // no methods_parameter_annotations so nothing to do
+- return true;
+- }
+-
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("methods_parameter_annotations length=%d",
+- methods_parameter_annotations->length()));
+-
+- for (int i = 0; i < methods_parameter_annotations->length(); i++) {
+- typeArrayHandle method_parameter_annotations(THREAD,
+- (typeArrayOop)methods_parameter_annotations->obj_at(i));
+- if (method_parameter_annotations.is_null()
+- || method_parameter_annotations->length() == 0) {
+- // this method does not have any parameter annotations so skip it
+- continue;
+- }
+-
+- if (method_parameter_annotations->length() < 1) {
+- // not enough room for a num_parameters field
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("length() is too small for a num_parameters field at %d", i));
+- return false;
+- }
+-
+- int byte_i = 0; // byte index into method_parameter_annotations
+-
+- u1 num_parameters = method_parameter_annotations->byte_at(byte_i);
+- byte_i++;
+-
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("num_parameters=%d", num_parameters));
+-
+- int calc_num_parameters = 0;
+- for (; calc_num_parameters < num_parameters; calc_num_parameters++) {
+- if (!rewrite_cp_refs_in_annotations_typeArray(
+- method_parameter_annotations, byte_i, THREAD)) {
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("bad method_parameter_annotations at %d", calc_num_parameters));
+- // propagate failure back to caller
+- return false;
+- }
+- }
+- assert(num_parameters == calc_num_parameters, "sanity check");
+- }
+-
+- return true;
+-} // end rewrite_cp_refs_in_methods_parameter_annotations()
+-
+-
+-// Rewrite constant pool references in a methods_default_annotations
+-// field. This "structure" is adapted from the AnnotationDefault_attribute
+-// that is described in section 4.8.19 of the 2nd-edition of the VM spec:
+-//
+-// methods_default_annotations_typeArray {
+-// element_value default_value;
+-// }
+-//
+-bool VM_RedefineClasses::rewrite_cp_refs_in_methods_default_annotations(
+- instanceKlassHandle scratch_class, TRAPS) {
+-
+- objArrayHandle methods_default_annotations(THREAD,
+- scratch_class->methods_default_annotations());
+-
+- if (methods_default_annotations.is_null()
+- || methods_default_annotations->length() == 0) {
+- // no methods_default_annotations so nothing to do
+- return true;
+- }
+-
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("methods_default_annotations length=%d",
+- methods_default_annotations->length()));
+-
+- for (int i = 0; i < methods_default_annotations->length(); i++) {
+- typeArrayHandle method_default_annotations(THREAD,
+- (typeArrayOop)methods_default_annotations->obj_at(i));
+- if (method_default_annotations.is_null()
+- || method_default_annotations->length() == 0) {
+- // this method does not have any default annotations so skip it
+- continue;
+- }
+-
+- int byte_i = 0; // byte index into method_default_annotations
+-
+- if (!rewrite_cp_refs_in_element_value(
+- method_default_annotations, byte_i, THREAD)) {
+- RC_TRACE_WITH_THREAD(0x02000000, THREAD,
+- ("bad default element_value at %d", i));
+- // propagate failure back to caller
+- return false;
+- }
+- }
+-
+- return true;
+-} // end rewrite_cp_refs_in_methods_default_annotations()
+-
+-
+-// Rewrite constant pool references in the method's stackmap table.
+-// These "structures" are adapted from the StackMapTable_attribute that
+-// is described in section 4.8.4 of the 6.0 version of the VM spec
+-// (dated 2005.10.26):
+-// file:///net/quincunx.sfbay/export/gbracha/ClassFile-Java6.pdf
+-//
+-// stack_map {
+-// u2 number_of_entries;
+-// stack_map_frame entries[number_of_entries];
+-// }
+-//
+-void VM_RedefineClasses::rewrite_cp_refs_in_stack_map_table(
+- methodHandle method, TRAPS) {
+-
+- if (!method->has_stackmap_table()) {
+- return;
+- }
+-
+- typeArrayOop stackmap_data = method->stackmap_data();
+- address stackmap_p = (address)stackmap_data->byte_at_addr(0);
+- address stackmap_end = stackmap_p + stackmap_data->length();
+-
+- assert(stackmap_p + 2 <= stackmap_end, "no room for number_of_entries");
+- u2 number_of_entries = Bytes::get_Java_u2(stackmap_p);
+- stackmap_p += 2;
+-
+- RC_TRACE_WITH_THREAD(0x04000000, THREAD,
+- ("number_of_entries=%u", number_of_entries));
+-
+- // walk through each stack_map_frame
+- u2 calc_number_of_entries = 0;
+- for (; calc_number_of_entries < number_of_entries; calc_number_of_entries++) {
+- // The stack_map_frame structure is a u1 frame_type followed by
+- // 0 or more bytes of data:
+- //
+- // union stack_map_frame {
+- // same_frame;
+- // same_locals_1_stack_item_frame;
+- // same_locals_1_stack_item_frame_extended;
+- // chop_frame;
+- // same_frame_extended;
+- // append_frame;
+- // full_frame;
+- // }
+-
+- assert(stackmap_p + 1 <= stackmap_end, "no room for frame_type");
+- // The Linux compiler does not like frame_type to be u1 or u2. It
+- // issues the following warning for the first if-statement below:
+- //
+- // "warning: comparison is always true due to limited range of data type"
+- //
+- u4 frame_type = *stackmap_p;
+- stackmap_p++;
+-
+- // same_frame {
+- // u1 frame_type = SAME; /* 0-63 */
+- // }
+- if (frame_type >= 0 && frame_type <= 63) {
+- // nothing more to do for same_frame
+- }
+-
+- // same_locals_1_stack_item_frame {
+- // u1 frame_type = SAME_LOCALS_1_STACK_ITEM; /* 64-127 */
+- // verification_type_info stack[1];
+- // }
+- else if (frame_type >= 64 && frame_type <= 127) {
+- rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end,
+- calc_number_of_entries, frame_type, THREAD);
+- }
+-
+- // reserved for future use
+- else if (frame_type >= 128 && frame_type <= 246) {
+- // nothing more to do for reserved frame_types
+- }
+-
+- // same_locals_1_stack_item_frame_extended {
+- // u1 frame_type = SAME_LOCALS_1_STACK_ITEM_EXTENDED; /* 247 */
+- // u2 offset_delta;
+- // verification_type_info stack[1];
+- // }
+- else if (frame_type == 247) {
+- stackmap_p += 2;
+- rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end,
+- calc_number_of_entries, frame_type, THREAD);
+- }
+-
+- // chop_frame {
+- // u1 frame_type = CHOP; /* 248-250 */
+- // u2 offset_delta;
+- // }
+- else if (frame_type >= 248 && frame_type <= 250) {
+- stackmap_p += 2;
+- }
+-
+- // same_frame_extended {
+- // u1 frame_type = SAME_FRAME_EXTENDED; /* 251*/
+- // u2 offset_delta;
+- // }
+- else if (frame_type == 251) {
+- stackmap_p += 2;
+- }
+-
+- // append_frame {
+- // u1 frame_type = APPEND; /* 252-254 */
+- // u2 offset_delta;
+- // verification_type_info locals[frame_type - 251];
+- // }
+- else if (frame_type >= 252 && frame_type <= 254) {
+- assert(stackmap_p + 2 <= stackmap_end,
+- "no room for offset_delta");
+- stackmap_p += 2;
+- u1 len = frame_type - 251;
+- for (u1 i = 0; i < len; i++) {
+- rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end,
+- calc_number_of_entries, frame_type, THREAD);
+- }
+- }
+-
+- // full_frame {
+- // u1 frame_type = FULL_FRAME; /* 255 */
+- // u2 offset_delta;
+- // u2 number_of_locals;
+- // verification_type_info locals[number_of_locals];
+- // u2 number_of_stack_items;
+- // verification_type_info stack[number_of_stack_items];
+- // }
+- else if (frame_type == 255) {
+- assert(stackmap_p + 2 + 2 <= stackmap_end,
+- "no room for smallest full_frame");
+- stackmap_p += 2;
+-
+- u2 number_of_locals = Bytes::get_Java_u2(stackmap_p);
+- stackmap_p += 2;
+-
+- for (u2 locals_i = 0; locals_i < number_of_locals; locals_i++) {
+- rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end,
+- calc_number_of_entries, frame_type, THREAD);
+- }
+-
+- // Use the largest size for the number_of_stack_items, but only get
+- // the right number of bytes.
+- u2 number_of_stack_items = Bytes::get_Java_u2(stackmap_p);
+- stackmap_p += 2;
+-
+- for (u2 stack_i = 0; stack_i < number_of_stack_items; stack_i++) {
+- rewrite_cp_refs_in_verification_type_info(stackmap_p, stackmap_end,
+- calc_number_of_entries, frame_type, THREAD);
+- }
+- }
+- } // end while there is a stack_map_frame
+- assert(number_of_entries == calc_number_of_entries, "sanity check");
+-} // end rewrite_cp_refs_in_stack_map_table()
+-
+-
+-// Rewrite constant pool references in the verification type info
+-// portion of the method's stackmap table. These "structures" are
+-// adapted from the StackMapTable_attribute that is described in
+-// section 4.8.4 of the 6.0 version of the VM spec (dated 2005.10.26):
+-// file:///net/quincunx.sfbay/export/gbracha/ClassFile-Java6.pdf
+-//
+-// The verification_type_info structure is a u1 tag followed by 0 or
+-// more bytes of data:
+-//
+-// union verification_type_info {
+-// Top_variable_info;
+-// Integer_variable_info;
+-// Float_variable_info;
+-// Long_variable_info;
+-// Double_variable_info;
+-// Null_variable_info;
+-// UninitializedThis_variable_info;
+-// Object_variable_info;
+-// Uninitialized_variable_info;
+-// }
+-//
+-void VM_RedefineClasses::rewrite_cp_refs_in_verification_type_info(
+- address& stackmap_p_ref, address stackmap_end, u2 frame_i,
+- u1 frame_type, TRAPS) {
+-
+- assert(stackmap_p_ref + 1 <= stackmap_end, "no room for tag");
+- u1 tag = *stackmap_p_ref;
+- stackmap_p_ref++;
+-
+- switch (tag) {
+- // Top_variable_info {
+- // u1 tag = ITEM_Top; /* 0 */
+- // }
+- // verificationType.hpp has zero as ITEM_Bogus instead of ITEM_Top
+- case 0: // fall through
+-
+- // Integer_variable_info {
+- // u1 tag = ITEM_Integer; /* 1 */
+- // }
+- case ITEM_Integer: // fall through
+-
+- // Float_variable_info {
+- // u1 tag = ITEM_Float; /* 2 */
+- // }
+- case ITEM_Float: // fall through
+-
+- // Double_variable_info {
+- // u1 tag = ITEM_Double; /* 3 */
+- // }
+- case ITEM_Double: // fall through
+-
+- // Long_variable_info {
+- // u1 tag = ITEM_Long; /* 4 */
+- // }
+- case ITEM_Long: // fall through
+-
+- // Null_variable_info {
+- // u1 tag = ITEM_Null; /* 5 */
+- // }
+- case ITEM_Null: // fall through
+-
+- // UninitializedThis_variable_info {
+- // u1 tag = ITEM_UninitializedThis; /* 6 */
+- // }
+- case ITEM_UninitializedThis:
+- // nothing more to do for the above tag types
+- break;
+-
+- // Object_variable_info {
+- // u1 tag = ITEM_Object; /* 7 */
+- // u2 cpool_index;
+- // }
+- case ITEM_Object:
+- {
+- assert(stackmap_p_ref + 2 <= stackmap_end, "no room for cpool_index");
+- u2 cpool_index = Bytes::get_Java_u2(stackmap_p_ref);
+- u2 new_cp_index = find_new_index(cpool_index);
+- if (new_cp_index != 0) {
+- RC_TRACE_WITH_THREAD(0x04000000, THREAD,
+- ("mapped old cpool_index=%d", cpool_index));
+- Bytes::put_Java_u2(stackmap_p_ref, new_cp_index);
+- cpool_index = new_cp_index;
+- }
+- stackmap_p_ref += 2;
+-
+- RC_TRACE_WITH_THREAD(0x04000000, THREAD,
+- ("frame_i=%u, frame_type=%u, cpool_index=%d", frame_i,
+- frame_type, cpool_index));
+- } break;
+-
+- // Uninitialized_variable_info {
+- // u1 tag = ITEM_Uninitialized; /* 8 */
+- // u2 offset;
+- // }
+- case ITEM_Uninitialized:
+- assert(stackmap_p_ref + 2 <= stackmap_end, "no room for offset");
+- stackmap_p_ref += 2;
+- break;
+-
+- default:
+- RC_TRACE_WITH_THREAD(0x04000000, THREAD,
+- ("frame_i=%u, frame_type=%u, bad tag=0x%x", frame_i, frame_type, tag));
+- ShouldNotReachHere();
+- break;
+- } // end switch (tag)
+-} // end rewrite_cp_refs_in_verification_type_info()
+-
+-
+-// Change the constant pool associated with klass scratch_class to
+-// scratch_cp. If shrink is true, then scratch_cp_length elements
+-// are copied from scratch_cp to a smaller constant pool and the
+-// smaller constant pool is associated with scratch_class.
+-void VM_RedefineClasses::set_new_constant_pool(
+- instanceKlassHandle scratch_class, constantPoolHandle scratch_cp,
+- int scratch_cp_length, TRAPS) {
+- assert(scratch_cp->length() >= scratch_cp_length, "sanity check");
+-
+- // scratch_cp is a merged constant pool and has enough space for a
+- // worst case merge situation. We want to associate the minimum
+- // sized constant pool with the klass to save space.
+- constantPoolHandle smaller_cp(THREAD,
+- oopFactory::new_constantPool(scratch_cp_length,
+- oopDesc::IsUnsafeConc,
+- THREAD));
+- // preserve orig_length() value in the smaller copy
+- int orig_length = scratch_cp->orig_length();
+- assert(orig_length != 0, "sanity check");
+- smaller_cp->set_orig_length(orig_length);
+-
+- // attach klass to new constant pool
+- // reference to the cp holder is needed for copy_operands()
+- smaller_cp->set_pool_holder(scratch_class());
+-
+- scratch_cp->copy_cp_to(1, scratch_cp_length - 1, smaller_cp, 1, THREAD);
+- scratch_cp = smaller_cp;
+- smaller_cp()->set_is_conc_safe(true);
+-
+- // attach new constant pool to klass
+- scratch_class->set_constants(scratch_cp());
+-
+- int i; // for portability
+-
+- // update each field in klass to use new constant pool indices as needed
+- for (JavaFieldStream fs(scratch_class); !fs.done(); fs.next()) {
+- jshort cur_index = fs.name_index();
+- jshort new_index = find_new_index(cur_index);
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("field-name_index change: %d to %d", cur_index, new_index));
+- fs.set_name_index(new_index);
+- }
+- cur_index = fs.signature_index();
+- new_index = find_new_index(cur_index);
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("field-signature_index change: %d to %d", cur_index, new_index));
+- fs.set_signature_index(new_index);
+- }
+- cur_index = fs.initval_index();
+- new_index = find_new_index(cur_index);
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("field-initval_index change: %d to %d", cur_index, new_index));
+- fs.set_initval_index(new_index);
+- }
+- cur_index = fs.generic_signature_index();
+- new_index = find_new_index(cur_index);
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("field-generic_signature change: %d to %d", cur_index, new_index));
+- fs.set_generic_signature_index(new_index);
+- }
+- } // end for each field
+-
+- // Update constant pool indices in the inner classes info to use
+- // new constant indices as needed. The inner classes info is a
+- // quadruple:
+- // (inner_class_info, outer_class_info, inner_name, inner_access_flags)
+- InnerClassesIterator iter(scratch_class);
+- for (; !iter.done(); iter.next()) {
+- int cur_index = iter.inner_class_info_index();
+- if (cur_index == 0) {
+- continue; // JVM spec. allows null inner class refs so skip it
+- }
+- int new_index = find_new_index(cur_index);
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("inner_class_info change: %d to %d", cur_index, new_index));
+- iter.set_inner_class_info_index(new_index);
+- }
+- cur_index = iter.outer_class_info_index();
+- new_index = find_new_index(cur_index);
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("outer_class_info change: %d to %d", cur_index, new_index));
+- iter.set_outer_class_info_index(new_index);
+- }
+- cur_index = iter.inner_name_index();
+- new_index = find_new_index(cur_index);
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("inner_name change: %d to %d", cur_index, new_index));
+- iter.set_inner_name_index(new_index);
+- }
+- } // end for each inner class
+-
+- // Attach each method in klass to the new constant pool and update
+- // to use new constant pool indices as needed:
+- objArrayHandle methods(THREAD, scratch_class->methods());
+- for (i = methods->length() - 1; i >= 0; i--) {
+- methodHandle method(THREAD, (methodOop)methods->obj_at(i));
+- method->set_constants(scratch_cp());
+-
+- int new_index = find_new_index(method->name_index());
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("method-name_index change: %d to %d", method->name_index(),
+- new_index));
+- method->set_name_index(new_index);
+- }
+- new_index = find_new_index(method->signature_index());
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("method-signature_index change: %d to %d",
+- method->signature_index(), new_index));
+- method->set_signature_index(new_index);
+- }
+- new_index = find_new_index(method->generic_signature_index());
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("method-generic_signature_index change: %d to %d",
+- method->generic_signature_index(), new_index));
+- method->set_generic_signature_index(new_index);
+- }
+-
+- // Update constant pool indices in the method's checked exception
+- // table to use new constant indices as needed.
+- int cext_length = method->checked_exceptions_length();
+- if (cext_length > 0) {
+- CheckedExceptionElement * cext_table =
+- method->checked_exceptions_start();
+- for (int j = 0; j < cext_length; j++) {
+- int cur_index = cext_table[j].class_cp_index;
+- int new_index = find_new_index(cur_index);
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("cext-class_cp_index change: %d to %d", cur_index, new_index));
+- cext_table[j].class_cp_index = (u2)new_index;
+- }
+- } // end for each checked exception table entry
+- } // end if there are checked exception table entries
+-
+- // Update each catch type index in the method's exception table
+- // to use new constant pool indices as needed. The exception table
+- // holds quadruple entries of the form:
+- // (beg_bci, end_bci, handler_bci, klass_index)
+-
+- ExceptionTable ex_table(method());
+- int ext_length = ex_table.length();
+-
+- for (int j = 0; j < ext_length; j ++) {
+- int cur_index = ex_table.catch_type_index(j);
+- int new_index = find_new_index(cur_index);
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("ext-klass_index change: %d to %d", cur_index, new_index));
+- ex_table.set_catch_type_index(j, new_index);
+- }
+- } // end for each exception table entry
+-
+- // Update constant pool indices in the method's local variable
+- // table to use new constant indices as needed. The local variable
+- // table hold sextuple entries of the form:
+- // (start_pc, length, name_index, descriptor_index, signature_index, slot)
+- int lvt_length = method->localvariable_table_length();
+- if (lvt_length > 0) {
+- LocalVariableTableElement * lv_table =
+- method->localvariable_table_start();
+- for (int j = 0; j < lvt_length; j++) {
+- int cur_index = lv_table[j].name_cp_index;
+- int new_index = find_new_index(cur_index);
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("lvt-name_cp_index change: %d to %d", cur_index, new_index));
+- lv_table[j].name_cp_index = (u2)new_index;
+- }
+- cur_index = lv_table[j].descriptor_cp_index;
+- new_index = find_new_index(cur_index);
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("lvt-descriptor_cp_index change: %d to %d", cur_index,
+- new_index));
+- lv_table[j].descriptor_cp_index = (u2)new_index;
+- }
+- cur_index = lv_table[j].signature_cp_index;
+- new_index = find_new_index(cur_index);
+- if (new_index != 0) {
+- RC_TRACE_WITH_THREAD(0x00080000, THREAD,
+- ("lvt-signature_cp_index change: %d to %d", cur_index, new_index));
+- lv_table[j].signature_cp_index = (u2)new_index;
+- }
+- } // end for each local variable table entry
+- } // end if there are local variable table entries
+-
+- rewrite_cp_refs_in_stack_map_table(method, THREAD);
+- } // end for each method
+- assert(scratch_cp()->is_conc_safe(), "Just checking");
+-} // end set_new_constant_pool()
+-
+-
+-// Unevolving classes may point to methods of the_class directly
++// Unevolving classes may point to old methods directly
+ // from their constant pool caches, itables, and/or vtables. We
+ // use the SystemDictionary::classes_do() facility and this helper
+-// to fix up these pointers.
++// to fix up these pointers. Additional field offsets and vtable indices
++// in the constant pool cache entries are fixed.
+ //
+ // Note: We currently don't support updating the vtable in
+ // arrayKlassOops. See Open Issues in jvmtiRedefineClasses.hpp.
+-void VM_RedefineClasses::adjust_cpool_cache_and_vtable(klassOop k_oop,
+- oop initiating_loader, TRAPS) {
++void VM_RedefineClasses::adjust_cpool_cache(klassOop k_oop_latest, oop initiating_loader, TRAPS) {
++ klassOop k_oop = k_oop_latest;
++ while (k_oop != NULL) {
++ //tty->print_cr("name=%s", k_oop->klass_part()->name()->as_C_string());
++/*
++ methodOop *matching_old_methods = NEW_RESOURCE_ARRAY(methodOop, _old_methods->length());
++ methodOop *matching_new_methods = NEW_RESOURCE_ARRAY(methodOop, _old_methods->length());
++
++ for (int i=0; i<_matching_methods_length; i++) {
++ matching_old_methods[i] = (methodOop)_old_methods->obj_at(_matching_old_methods[i]);
++ matching_new_methods[i] = (methodOop)_new_methods->obj_at(_matching_new_methods[i]);
++ }*/
++
++ Klass *k = k_oop->klass_part();
++ if (k->oop_is_instance()) {
++ HandleMark hm(THREAD);
++ instanceKlass *ik = (instanceKlass *) k;
++
++ constantPoolHandle other_cp;
++ constantPoolCacheOop cp_cache;
++
++ other_cp = constantPoolHandle(ik->constants());
++
++ for (int i=0; i<other_cp->length(); i++) {
++ if (other_cp->tag_at(i).is_klass()) {
++ klassOop klass = other_cp->klass_at(i, THREAD);
++ if (klass->klass_part()->new_version() != NULL) {
++
++ // (tw) TODO: check why/if this is necessary
++ other_cp->klass_at_put(i, klass->klass_part()->new_version());
++ }
++ klass = other_cp->klass_at(i, THREAD);
++ assert(klass->klass_part()->new_version() == NULL, "Must be new klass!");
++ }
++ }
++
++ cp_cache = other_cp->cache();
++
++ if (cp_cache != NULL) {
++ cp_cache->adjust_entries(NULL,
++ NULL,
++ 0);
++ }
++
++ // If bytecode rewriting is enabled, we also need to unpatch bytecode to force resolution of zeroied entries
++ if (RewriteBytecodes) {
++ ik->methods_do(unpatch_bytecode);
++ }
++ }
++ k_oop = k_oop->klass_part()->old_version();
++ }
++}
++
++void VM_RedefineClasses::update_jmethod_ids() {
++ for (int j = 0; j < _matching_methods_length; ++j) {
++ methodOop old_method = (methodOop)_old_methods->obj_at(_matching_old_methods[j]);
++ RC_TRACE(0x00008000, ("matching method %s", old_method->name_and_sig_as_C_string()));
++
++ jmethodID jmid = old_method->find_jmethod_id_or_null();
++ if (old_method->new_version() != NULL && jmid == NULL) {
++ // (tw) Have to create jmethodID in this case
++ jmid = old_method->jmethod_id();
++ }
++
++ if (jmid != NULL) {
++ // There is a jmethodID, change it to point to the new method
++ methodHandle new_method_h((methodOop)_new_methods->obj_at(_matching_new_methods[j]));
++ if (old_method->new_version() == NULL) {
++ methodHandle old_method_h((methodOop)_old_methods->obj_at(_matching_old_methods[j]));
++ jmethodID new_jmethod_id = JNIHandles::make_jmethod_id(old_method_h);
++ bool result = instanceKlass::cast(old_method_h->method_holder())->update_jmethod_id(old_method_h(), new_jmethod_id);
++ //RC_TRACE(0x00008000, ("Changed jmethodID for old method assigned to %d / result=%d", new_jmethod_id, result);
++ //RC_TRACE(0x00008000, ("jmethodID new method: %d jmethodID old method: %d", new_method_h->jmethod_id(), old_method->jmethod_id());
++ } else {
++ jmethodID mid = new_method_h->jmethod_id();
++ bool result = instanceKlass::cast(new_method_h->method_holder())->update_jmethod_id(new_method_h(), jmid);
++ //RC_TRACE(0x00008000, ("Changed jmethodID for new method assigned to %d / result=%d", jmid, result);
++
++ }
++ JNIHandles::change_method_associated_with_jmethod_id(jmid, new_method_h);
++ //RC_TRACE(0x00008000, ("changing method associated with jmethod id %d to %s", (int)jmid, new_method_h->name()->as_C_string());
++ assert(JNIHandles::resolve_jmethod_id(jmid) == (methodOop)_new_methods->obj_at(_matching_new_methods[j]), "should be replaced");
++ jmethodID mid = ((methodOop)_new_methods->obj_at(_matching_new_methods[j]))->jmethod_id();
++ assert(JNIHandles::resolve_non_null((jobject)mid) == new_method_h(), "must match!");
++
++ //RC_TRACE(0x00008000, ("jmethodID new method: %d jmethodID old method: %d", new_method_h->jmethod_id(), old_method->jmethod_id());
++ }
++ }
++}
++
++
++// Deoptimize all compiled code that depends on this class.
++//
++// If the can_redefine_classes capability is obtained in the onload
++// phase then the compiler has recorded all dependencies from startup.
++// In that case we need only deoptimize and throw away all compiled code
++// that depends on the class.
++//
++// If can_redefine_classes is obtained sometime after the onload
++// phase then the dependency information may be incomplete. In that case
++// the first call to RedefineClasses causes all compiled code to be
++// thrown away. As can_redefine_classes has been obtained then
++// all future compilations will record dependencies so second and
++// subsequent calls to RedefineClasses need only throw away code
++// that depends on the class.
++//
++void VM_RedefineClasses::flush_dependent_code(instanceKlassHandle k_h, TRAPS) {
++ assert_locked_or_safepoint(Compile_lock);
++
++ // All dependencies have been recorded from startup or this is a second or
++ // subsequent use of RedefineClasses
++
++ // For now deopt all
++ // (tw) TODO: Improve the dependency system such that we can safely deopt only a subset of the methods
++ if (0 && JvmtiExport::all_dependencies_are_recorded()) {
++ Universe::flush_evol_dependents_on(k_h);
++ } else {
++ CodeCache::mark_all_nmethods_for_deoptimization();
++
++ ResourceMark rm(THREAD);
++ DeoptimizationMarker dm;
++
++ // Deoptimize all activations depending on marked nmethods
++ Deoptimization::deoptimize_dependents();
++
++ // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies)
++ CodeCache::make_marked_nmethods_not_entrant();
++
++ // From now on we know that the dependency information is complete
++ JvmtiExport::set_all_dependencies_are_recorded(true);
++ }
++}
++
++void VM_RedefineClasses::compute_added_deleted_matching_methods() {
++ methodOop old_method;
++ methodOop new_method;
++
++ _matching_old_methods = NEW_RESOURCE_ARRAY(int, _old_methods->length());
++ _matching_new_methods = NEW_RESOURCE_ARRAY(int, _old_methods->length());
++ _added_methods = NEW_RESOURCE_ARRAY(int, _new_methods->length());
++ _deleted_methods = NEW_RESOURCE_ARRAY(int, _old_methods->length());
++
++ _matching_methods_length = 0;
++ _deleted_methods_length = 0;
++ _added_methods_length = 0;
++
++ int nj = 0;
++ int oj = 0;
++ while (true) {
++ if (oj >= _old_methods->length()) {
++ if (nj >= _new_methods->length()) {
++ break; // we've looked at everything, done
++ }
++ // New method at the end
++ new_method = (methodOop) _new_methods->obj_at(nj);
++ _added_methods[_added_methods_length++] = nj;
++ ++nj;
++ } else if (nj >= _new_methods->length()) {
++ // Old method, at the end, is deleted
++ old_method = (methodOop) _old_methods->obj_at(oj);
++ _deleted_methods[_deleted_methods_length++] = oj;
++ ++oj;
++ } else {
++ old_method = (methodOop) _old_methods->obj_at(oj);
++ new_method = (methodOop) _new_methods->obj_at(nj);
++ if (old_method->name() == new_method->name()) {
++ if (old_method->signature() == new_method->signature()) {
++ _matching_old_methods[_matching_methods_length ] = oj;//old_method;
++ _matching_new_methods[_matching_methods_length++] = nj;//new_method;
++ ++nj;
++ ++oj;
++ } else {
++ // added overloaded have already been moved to the end,
++ // so this is a deleted overloaded method
++ _deleted_methods[_deleted_methods_length++] = oj;//old_method;
++ ++oj;
++ }
++ } else { // names don't match
++ if (old_method->name()->fast_compare(new_method->name()) > 0) {
++ // new method
++ _added_methods[_added_methods_length++] = nj;//new_method;
++ ++nj;
++ } else {
++ // deleted method
++ _deleted_methods[_deleted_methods_length++] = oj;//old_method;
++ ++oj;
++ }
++ }
++ }
++ }
++ assert(_matching_methods_length + _deleted_methods_length == _old_methods->length(), "sanity");
++ assert(_matching_methods_length + _added_methods_length == _new_methods->length(), "sanity");
++ RC_TRACE(0x00008000, ("Matching methods = %d / deleted methods = %d / added methods = %d",
++ _matching_methods_length, _deleted_methods_length, _added_methods_length));
++}
++
++
++
++// Install the redefinition of a class:
++// - house keeping (flushing breakpoints and caches, deoptimizing
++// dependent compiled code)
++// - adjusting constant pool caches and vtables in other classes
++void VM_RedefineClasses::redefine_single_class(instanceKlassHandle the_new_class, TRAPS) {
++
++ ResourceMark rm(THREAD);
++
++ assert(the_new_class->old_version() != NULL, "Must not be null");
++ assert(the_new_class->old_version()->klass_part()->new_version() == the_new_class(), "Must equal");
++
++ instanceKlassHandle the_old_class = instanceKlassHandle(THREAD, the_new_class->old_version());
++
++#ifndef JVMTI_KERNEL
++ // Remove all breakpoints in methods of this class
++ JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
++ jvmti_breakpoints.clearall_in_class_at_safepoint(the_old_class());
++#endif // !JVMTI_KERNEL
++
++ if (the_old_class() == Universe::reflect_invoke_cache()->klass()) {
++ // We are redefining java.lang.reflect.Method. Method.invoke() is
++ // cached and users of the cache care about each active version of
++ // the method so we have to track this previous version.
++ // Do this before methods get switched
++ Universe::reflect_invoke_cache()->add_previous_version(
++ the_old_class->method_with_idnum(Universe::reflect_invoke_cache()->method_idnum()));
++ }
++
++ _old_methods = the_old_class->methods();
++ _new_methods = the_new_class->methods();
++ _the_class_oop = the_old_class();
++ compute_added_deleted_matching_methods();
++
++ // track which methods are EMCP for add_previous_version() call below
++
++ // (tw) TODO: Check if we need the concept of EMCP?
++ BitMap emcp_methods(_old_methods->length());
++ int emcp_method_count = 0;
++ emcp_methods.clear(); // clears 0..(length() - 1)
++
++ // We need to mark methods as old!!
++ check_methods_and_mark_as_obsolete(&emcp_methods, &emcp_method_count);
++ update_jmethod_ids();
++
++ // keep track of previous versions of this class
++ the_new_class->add_previous_version(the_old_class, &emcp_methods,
++ emcp_method_count);
++
++ // TODO:
++ transfer_old_native_function_registrations(the_old_class);
++
++
++#ifdef ASSERT
++
++// klassOop systemLookup1 = SystemDictionary::resolve_or_null(the_old_class->name(), the_old_class->class_loader(), the_old_class->protection_domain(), THREAD);
++// assert(systemLookup1 == the_new_class(), "New class must be in system dictionary!");
++
++ //JNIHandles::verify();
++
++// klassOop systemLookup = SystemDictionary::resolve_or_null(the_old_class->name(), the_old_class->class_loader(), the_old_class->protection_domain(), THREAD);
++
++// assert(systemLookup == the_new_class(), "New class must be in system dictionary!");
++ assert(the_new_class->old_version() != NULL, "Must not be null");
++ assert(the_new_class->old_version()->klass_part()->new_version() == the_new_class(), "Must equal");
++
++ for (int i=0; i<the_new_class->methods()->length(); i++) {
++ assert(((methodOop)the_new_class->methods()->obj_at(i))->method_holder() == the_new_class(), "method holder must match!");
++ }
++
++ _old_methods->verify();
++ _new_methods->verify();
++
++ the_new_class->vtable()->verify(tty);
++ the_old_class->vtable()->verify(tty);
++
++#endif
++
++ // increment the classRedefinedCount field in the_class and in any
++ // direct and indirect subclasses of the_class
++ increment_class_counter((instanceKlass *)the_old_class()->klass_part(), THREAD);
++
++}
++
++
++void VM_RedefineClasses::check_methods_and_mark_as_obsolete(BitMap *emcp_methods, int * emcp_method_count_p) {
++ RC_TRACE(0x00008000, ("Checking matching methods for EMCP"));
++ *emcp_method_count_p = 0;
++ int obsolete_count = 0;
++ int old_index = 0;
++ for (int j = 0; j < _matching_methods_length; ++j, ++old_index) {
++ methodOop old_method = (methodOop)_old_methods->obj_at(_matching_old_methods[j]);
++ methodOop new_method = (methodOop)_new_methods->obj_at(_matching_new_methods[j]);
++ methodOop old_array_method;
++
++ // Maintain an old_index into the _old_methods array by skipping
++ // deleted methods
++ while ((old_array_method = (methodOop) _old_methods->obj_at(old_index))
++ != old_method) {
++ ++old_index;
++ }
++
++ if (MethodComparator::methods_EMCP(old_method, new_method)) {
++ // The EMCP definition from JSR-163 requires the bytecodes to be
++ // the same with the exception of constant pool indices which may
++ // differ. However, the constants referred to by those indices
++ // must be the same.
++ //
++ // We use methods_EMCP() for comparison since constant pool
++ // merging can remove duplicate constant pool entries that were
++ // present in the old method and removed from the rewritten new
++ // method. A faster binary comparison function would consider the
++ // old and new methods to be different when they are actually
++ // EMCP.
++
++ // track which methods are EMCP for add_previous_version() call
++ emcp_methods->set_bit(old_index);
++ (*emcp_method_count_p)++;
++
++ // An EMCP method is _not_ obsolete. An obsolete method has a
++ // different jmethodID than the current method. An EMCP method
++ // has the same jmethodID as the current method. Having the
++ // same jmethodID for all EMCP versions of a method allows for
++ // a consistent view of the EMCP methods regardless of which
++ // EMCP method you happen to have in hand. For example, a
++ // breakpoint set in one EMCP method will work for all EMCP
++ // versions of the method including the current one.
++
++ old_method->set_new_version(new_method);
++ new_method->set_old_version(old_method);
++
++ RC_TRACE(0x00008000, ("Found EMCP method %s", old_method->name_and_sig_as_C_string()));
++
++ // Transfer breakpoints
++ instanceKlass *ik = instanceKlass::cast(old_method->method_holder());
++ for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = bp->next()) {
++ RC_TRACE(0x00000002, ("Checking breakpoint"));
++ RC_TRACE(0x00000002, ("%d / %d",
++ bp->match(old_method), bp->match(new_method)));
++ if (bp->match(old_method)) {
++ assert(bp->match(new_method), "if old method is method, then new method must match too");
++ RC_TRACE(0x00000002, ("Found a breakpoint in an old EMCP method"));
++ new_method->set_breakpoint(bp->bci());
++ }
++ }
++
++
++
++ } else {
++ // mark obsolete methods as such
++ old_method->set_is_obsolete();
++ obsolete_count++;
++
++ // With tracing we try not to "yack" too much. The position of
++ // this trace assumes there are fewer obsolete methods than
++ // EMCP methods.
++ RC_TRACE(0x00008000, ("mark %s(%s) as obsolete",
++ old_method->name()->as_C_string(),
++ old_method->signature()->as_C_string()));
++ }
++ old_method->set_is_old();
++ }
++ for (int i = 0; i < _deleted_methods_length; ++i) {
++ methodOop old_method = (methodOop)_old_methods->obj_at(_deleted_methods[i]);
++
++ //assert(old_method->vtable_index() < 0,
++ // "cannot delete methods with vtable entries");;
++
++ // Mark all deleted methods as old and obsolete
++ old_method->set_is_old();
++ old_method->set_is_obsolete();
++ ++obsolete_count;
++ // With tracing we try not to "yack" too much. The position of
++ // this trace assumes there are fewer obsolete methods than
++ // EMCP methods.
++ RC_TRACE(0x00008000, ("mark deleted %s(%s) as obsolete",
++ old_method->name()->as_C_string(),
++ old_method->signature()->as_C_string()));
++ }
++ //assert((*emcp_method_count_p + obsolete_count) == _old_methods->length(), "sanity check");
++ RC_TRACE(0x00008000, ("EMCP_cnt=%d, obsolete_cnt=%d !", *emcp_method_count_p, obsolete_count));
++}
++
++// Increment the classRedefinedCount field in the specific instanceKlass
++// and in all direct and indirect subclasses.
++void VM_RedefineClasses::increment_class_counter(instanceKlass *ik, TRAPS) {
++ oop class_mirror = ik->java_mirror();
++ klassOop class_oop = java_lang_Class::as_klassOop(class_mirror);
++ int new_count = java_lang_Class::classRedefinedCount(class_mirror) + 1;
++ java_lang_Class::set_classRedefinedCount(class_mirror, new_count);
++ RC_TRACE(0x00008000, ("updated count for class=%s to %d", ik->external_name(), new_count));
++}
++
++#ifndef PRODUCT
++void VM_RedefineClasses::check_class(klassOop k_oop, TRAPS) {
+ Klass *k = k_oop->klass_part();
+ if (k->oop_is_instance()) {
+ HandleMark hm(THREAD);
+ instanceKlass *ik = (instanceKlass *) k;
+-
+- // HotSpot specific optimization! HotSpot does not currently
+- // support delegation from the bootstrap class loader to a
+- // user-defined class loader. This means that if the bootstrap
+- // class loader is the initiating class loader, then it will also
+- // be the defining class loader. This also means that classes
+- // loaded by the bootstrap class loader cannot refer to classes
+- // loaded by a user-defined class loader. Note: a user-defined
+- // class loader can delegate to the bootstrap class loader.
+- //
+- // If the current class being redefined has a user-defined class
+- // loader as its defining class loader, then we can skip all
+- // classes loaded by the bootstrap class loader.
+- bool is_user_defined =
+- instanceKlass::cast(_the_class_oop)->class_loader() != NULL;
+- if (is_user_defined && ik->class_loader() == NULL) {
+- return;
+- }
+-
+- // This is a very busy routine. We don't want too much tracing
+- // printed out.
+- bool trace_name_printed = false;
+-
+- // Very noisy: only enable this call if you are trying to determine
+- // that a specific class gets found by this routine.
+- // RC_TRACE macro has an embedded ResourceMark
+- // RC_TRACE_WITH_THREAD(0x00100000, THREAD,
+- // ("adjust check: name=%s", ik->external_name()));
+- // trace_name_printed = true;
+-
+- // Fix the vtable embedded in the_class and subclasses of the_class,
+- // if one exists. We discard scratch_class and we don't keep an
+- // instanceKlass around to hold obsolete methods so we don't have
+- // any other instanceKlass embedded vtables to update. The vtable
+- // holds the methodOops for virtual (but not final) methods.
+- if (ik->vtable_length() > 0 && ik->is_subtype_of(_the_class_oop)) {
+- // ik->vtable() creates a wrapper object; rm cleans it up
++ assert(ik->is_newest_version(), "must be latest version in system dictionary");
++
++ if (ik->vtable_length() > 0) {
+ ResourceMark rm(THREAD);
+- ik->vtable()->adjust_method_entries(_matching_old_methods,
+- _matching_new_methods,
+- _matching_methods_length,
+- &trace_name_printed);
+- }
+-
+- // If the current class has an itable and we are either redefining an
+- // interface or if the current class is a subclass of the_class, then
+- // we potentially have to fix the itable. If we are redefining an
+- // interface, then we have to call adjust_method_entries() for
+- // every instanceKlass that has an itable since there isn't a
+- // subclass relationship between an interface and an instanceKlass.
+- if (ik->itable_length() > 0 && (Klass::cast(_the_class_oop)->is_interface()
+- || ik->is_subclass_of(_the_class_oop))) {
+- // ik->itable() creates a wrapper object; rm cleans it up
+- ResourceMark rm(THREAD);
+- ik->itable()->adjust_method_entries(_matching_old_methods,
+- _matching_new_methods,
+- _matching_methods_length,
+- &trace_name_printed);
+- }
+-
+- // The constant pools in other classes (other_cp) can refer to
+- // methods in the_class. We have to update method information in
+- // other_cp's cache. If other_cp has a previous version, then we
+- // have to repeat the process for each previous version. The
+- // constant pool cache holds the methodOops for non-virtual
+- // methods and for virtual, final methods.
+- //
+- // Special case: if the current class is the_class, then new_cp
+- // has already been attached to the_class and old_cp has already
+- // been added as a previous version. The new_cp doesn't have any
+- // cached references to old methods so it doesn't need to be
+- // updated. We can simply start with the previous version(s) in
+- // that case.
+- constantPoolHandle other_cp;
+- constantPoolCacheOop cp_cache;
+-
+- if (k_oop != _the_class_oop) {
+- // this klass' constant pool cache may need adjustment
+- other_cp = constantPoolHandle(ik->constants());
+- cp_cache = other_cp->cache();
+- if (cp_cache != NULL) {
+- cp_cache->adjust_method_entries(_matching_old_methods,
+- _matching_new_methods,
+- _matching_methods_length,
+- &trace_name_printed);
++ if (!ik->vtable()->check_no_old_entries()) {
++ RC_TRACE(0x00000001, ("size of class: %d\n",
++ k_oop->size()));
++ RC_TRACE(0x00000001, ("klassVtable::check_no_old_entries failure -- OLD method found -- class: %s",
++ ik->signature_name()));
++ assert(false, "OLD method found");
+ }
+- }
+- {
+- ResourceMark rm(THREAD);
+- // PreviousVersionInfo objects returned via PreviousVersionWalker
+- // contain a GrowableArray of handles. We have to clean up the
+- // GrowableArray _after_ the PreviousVersionWalker destructor
+- // has destroyed the handles.
+- {
+- // the previous versions' constant pool caches may need adjustment
+- PreviousVersionWalker pvw(ik);
+- for (PreviousVersionInfo * pv_info = pvw.next_previous_version();
+- pv_info != NULL; pv_info = pvw.next_previous_version()) {
+- other_cp = pv_info->prev_constant_pool_handle();
+- cp_cache = other_cp->cache();
+- if (cp_cache != NULL) {
+- cp_cache->adjust_method_entries(_matching_old_methods,
+- _matching_new_methods,
+- _matching_methods_length,
+- &trace_name_printed);
+- }
+- }
+- } // pvw is cleaned up
+- } // rm is cleaned up
+- }
+-}
+-
+-void VM_RedefineClasses::update_jmethod_ids() {
+- for (int j = 0; j < _matching_methods_length; ++j) {
+- methodOop old_method = _matching_old_methods[j];
+- jmethodID jmid = old_method->find_jmethod_id_or_null();
+- if (jmid != NULL) {
+- // There is a jmethodID, change it to point to the new method
+- methodHandle new_method_h(_matching_new_methods[j]);
+- JNIHandles::change_method_associated_with_jmethod_id(jmid, new_method_h);
+- assert(JNIHandles::resolve_jmethod_id(jmid) == _matching_new_methods[j],
+- "should be replaced");
++
++ ik->vtable()->verify(tty, true);
+ }
+ }
+ }
+
+-void VM_RedefineClasses::check_methods_and_mark_as_obsolete(
+- BitMap *emcp_methods, int * emcp_method_count_p) {
+- *emcp_method_count_p = 0;
+- int obsolete_count = 0;
+- int old_index = 0;
+- for (int j = 0; j < _matching_methods_length; ++j, ++old_index) {
+- methodOop old_method = _matching_old_methods[j];
+- methodOop new_method = _matching_new_methods[j];
+- methodOop old_array_method;
+-
+- // Maintain an old_index into the _old_methods array by skipping
+- // deleted methods
+- while ((old_array_method = (methodOop) _old_methods->obj_at(old_index))
+- != old_method) {
+- ++old_index;
++#endif
++
++VM_RedefineClasses::FindAffectedKlassesClosure::FindAffectedKlassesClosure( GrowableArray<instanceKlassHandle> *original_klasses, GrowableArray<instanceKlassHandle> *result )
++{
++ assert(original_klasses != NULL && result != NULL, "");
++ this->_original_klasses = original_klasses;
++ this->_result = result;
++ SystemDictionary::classes_do(this);
++}
++
++void VM_RedefineClasses::FindAffectedKlassesClosure::do_object( oop obj )
++{
++ klassOop klass = (klassOop)obj;
++ assert(!_result->contains(klass), "must not occur more than once!");
++ assert(klass->klass_part()->new_version() == NULL, "Only last version is valid entry in system dictionary");
++
++ for(int i=0; i<_original_klasses->length(); i++) {
++ instanceKlassHandle cur = _original_klasses->at(i);
++ if (cur() != klass && klass->klass_part()->is_subtype_of(cur()) && !_original_klasses->contains(klass)) {
++ RC_TRACE(0x00008000, ("Found affected class: %s", klass->klass_part()->name()->as_C_string()));
++ _result->append(klass);
++ break;
+ }
+-
+- if (MethodComparator::methods_EMCP(old_method, new_method)) {
+- // The EMCP definition from JSR-163 requires the bytecodes to be
+- // the same with the exception of constant pool indices which may
+- // differ. However, the constants referred to by those indices
+- // must be the same.
+- //
+- // We use methods_EMCP() for comparison since constant pool
+- // merging can remove duplicate constant pool entries that were
+- // present in the old method and removed from the rewritten new
+- // method. A faster binary comparison function would consider the
+- // old and new methods to be different when they are actually
+- // EMCP.
+- //
+- // The old and new methods are EMCP and you would think that we
+- // could get rid of one of them here and now and save some space.
+- // However, the concept of EMCP only considers the bytecodes and
+- // the constant pool entries in the comparison. Other things,
+- // e.g., the line number table (LNT) or the local variable table
+- // (LVT) don't count in the comparison. So the new (and EMCP)
+- // method can have a new LNT that we need so we can't just
+- // overwrite the new method with the old method.
+- //
+- // When this routine is called, we have already attached the new
+- // methods to the_class so the old methods are effectively
+- // overwritten. However, if an old method is still executing,
+- // then the old method cannot be collected until sometime after
+- // the old method call has returned. So the overwriting of old
+- // methods by new methods will save us space except for those
+- // (hopefully few) old methods that are still executing.
+- //
+- // A method refers to a constMethodOop and this presents another
+- // possible avenue to space savings. The constMethodOop in the
+- // new method contains possibly new attributes (LNT, LVT, etc).
+- // At first glance, it seems possible to save space by replacing
+- // the constMethodOop in the old method with the constMethodOop
+- // from the new method. The old and new methods would share the
+- // same constMethodOop and we would save the space occupied by
+- // the old constMethodOop. However, the constMethodOop contains
+- // a back reference to the containing method. Sharing the
+- // constMethodOop between two methods could lead to confusion in
+- // the code that uses the back reference. This would lead to
+- // brittle code that could be broken in non-obvious ways now or
+- // in the future.
+- //
+- // Another possibility is to copy the constMethodOop from the new
+- // method to the old method and then overwrite the new method with
+- // the old method. Since the constMethodOop contains the bytecodes
+- // for the method embedded in the oop, this option would change
+- // the bytecodes out from under any threads executing the old
+- // method and make the thread's bcp invalid. Since EMCP requires
+- // that the bytecodes be the same modulo constant pool indices, it
+- // is straight forward to compute the correct new bcp in the new
+- // constMethodOop from the old bcp in the old constMethodOop. The
+- // time consuming part would be searching all the frames in all
+- // of the threads to find all of the calls to the old method.
+- //
+- // It looks like we will have to live with the limited savings
+- // that we get from effectively overwriting the old methods
+- // when the new methods are attached to the_class.
+-
+- // track which methods are EMCP for add_previous_version() call
+- emcp_methods->set_bit(old_index);
+- (*emcp_method_count_p)++;
+-
+- // An EMCP method is _not_ obsolete. An obsolete method has a
+- // different jmethodID than the current method. An EMCP method
+- // has the same jmethodID as the current method. Having the
+- // same jmethodID for all EMCP versions of a method allows for
+- // a consistent view of the EMCP methods regardless of which
+- // EMCP method you happen to have in hand. For example, a
+- // breakpoint set in one EMCP method will work for all EMCP
+- // versions of the method including the current one.
+- } else {
+- // mark obsolete methods as such
+- old_method->set_is_obsolete();
+- obsolete_count++;
+-
+- // obsolete methods need a unique idnum
+- u2 num = instanceKlass::cast(_the_class_oop)->next_method_idnum();
+- if (num != constMethodOopDesc::UNSET_IDNUM) {
+-// u2 old_num = old_method->method_idnum();
+- old_method->set_method_idnum(num);
+-// TO DO: attach obsolete annotations to obsolete method's new idnum
++ }
++}
++
++jvmtiError VM_RedefineClasses::do_topological_class_sorting( const jvmtiClassDefinition *class_defs, int class_count, GrowableArray<instanceKlassHandle> *affected, GrowableArray<instanceKlassHandle> *arr, TRAPS)
++{
++ GrowableArray< Pair<klassOop, klassOop> > *links = new GrowableArray< Pair<klassOop, klassOop> >();
++
++ for (int i=0; i<class_count; i++) {
++
++ oop mirror = JNIHandles::resolve_non_null(class_defs[i].klass);
++ klassOop the_class_oop = java_lang_Class::as_klassOop(mirror);
++ instanceKlassHandle the_class(THREAD, the_class_oop);
++ Handle the_class_loader(THREAD, the_class->class_loader());
++ Handle protection_domain(THREAD, the_class->protection_domain());
++
++ ClassFileStream st((u1*) class_defs[i].class_bytes,
++ class_defs[i].class_byte_count, (char *)"__VM_RedefineClasses__");
++ ClassFileParser cfp(&st);
++
++ GrowableArray<Symbol*> symbolArr;
++ RC_TRACE(0x00000002, ("Before find super symbols of class %s",
++ the_class->name()->as_C_string()));
++ cfp.findSuperSymbols(the_class->name(), the_class_loader, protection_domain, the_class, symbolArr, THREAD);
++
++ for (int j=0; j<symbolArr.length(); j++) {
++ Symbol* sym = symbolArr.at(j);
++
++ RC_TRACE(0x00008000, ("Before adding link to super class %s", sym->as_C_string()));
++
++ for (int k=0; k<arr->length(); k++) {
++ klassOop curOop = arr->at(k)();
++ // (tw) TODO: Check if we get aliasing problems with different class loaders?
++ if (curOop->klass_part()->name() == sym /*&& curOop->klass_part()->class_loader() == the_class_loader()*/) {
++ RC_TRACE(0x00000002, ("Found class to link"));
++ links->append(Pair<klassOop, klassOop>(curOop, the_class()));
++ break;
++ }
+ }
+- // With tracing we try not to "yack" too much. The position of
+- // this trace assumes there are fewer obsolete methods than
+- // EMCP methods.
+- RC_TRACE(0x00000100, ("mark %s(%s) as obsolete",
+- old_method->name()->as_C_string(),
+- old_method->signature()->as_C_string()));
+ }
+- old_method->set_is_old();
+ }
+- for (int i = 0; i < _deleted_methods_length; ++i) {
+- methodOop old_method = _deleted_methods[i];
+-
+- assert(old_method->vtable_index() < 0,
+- "cannot delete methods with vtable entries");;
+-
+- // Mark all deleted methods as old and obsolete
+- old_method->set_is_old();
+- old_method->set_is_obsolete();
+- ++obsolete_count;
+- // With tracing we try not to "yack" too much. The position of
+- // this trace assumes there are fewer obsolete methods than
+- // EMCP methods.
+- RC_TRACE(0x00000100, ("mark deleted %s(%s) as obsolete",
+- old_method->name()->as_C_string(),
+- old_method->signature()->as_C_string()));
++
++
++ RC_TRACE(0x00000001, ("Identified links between classes! "));
++
++ for (int i=0; i<affected->length(); i++) {
++
++ instanceKlassHandle klass = affected->at(i);
++
++ klassOop superKlass = klass->super();
++ if (affected->contains(superKlass)) {
++ links->append(Pair<klassOop, klassOop>(superKlass, klass()));
++ }
++
++ objArrayOop superInterfaces = klass->local_interfaces();
++ for (int j=0; j<superInterfaces->length(); j++) {
++ klassOop interfaceKlass = (klassOop)superInterfaces->obj_at(j);
++ if (arr->contains(interfaceKlass)) {
++ links->append(Pair<klassOop, klassOop>(interfaceKlass, klass()));
++ }
++ }
+ }
+- assert((*emcp_method_count_p + obsolete_count) == _old_methods->length(),
+- "sanity check");
+- RC_TRACE(0x00000100, ("EMCP_cnt=%d, obsolete_cnt=%d", *emcp_method_count_p,
+- obsolete_count));
++
++ if (RC_TRACE_ENABLED(0x00000002)) {
++ RC_TRACE(0x00000002, ("Identified links: "));
++ for (int i=0; i<links->length(); i++) {
++ RC_TRACE(0x00000002, ("%s to %s",
++ links->at(i).left()->klass_part()->name()->as_C_string(),
++ links->at(i).right()->klass_part()->name()->as_C_string()));
++ }
++ }
++
++ for (int i=0; i<arr->length(); i++) {
++
++ int j;
++ for (j=i; j<arr->length(); j++) {
++
++ int k;
++ for (k=0; k<links->length(); k++) {
++
++ klassOop k1 = links->adr_at(k)->right();
++ klassOop k2 = arr->at(j)();
++ if (k1 == k2) {
++ break;
++ }
++ }
++
++ if (k == links->length()) {
++ break;
++ }
++ }
++
++ if (j == arr->length()) {
++ // circle detected
++ return JVMTI_ERROR_CIRCULAR_CLASS_DEFINITION;
++ }
++
++ for (int k=0; k<links->length(); k++) {
++ if (links->adr_at(k)->left() == arr->at(j)()) {
++ links->at_put(k, links->at(links->length() - 1));
++ links->remove_at(links->length() - 1);
++ k--;
++ }
++ }
++
++ instanceKlassHandle tmp = arr->at(j);
++ arr->at_put(j, arr->at(i));
++ arr->at_put(i, tmp);
++ }
++
++ return JVMTI_ERROR_NONE;
+ }
+
++void VM_RedefineClasses::oops_do(OopClosure *closure) {
++
++ if (_updated_oops != NULL) {
++ for (int i=0; i<_updated_oops->length(); i++) {
++ closure->do_oop(_updated_oops->adr_at(i));
++ }
++ }
++}
++
++void VM_RedefineClasses::transfer_special_access_flags(fieldDescriptor *from, fieldDescriptor *to) {
++ to->set_is_field_modification_watched(from->is_field_modification_watched());
++ to->set_is_field_access_watched(from->is_field_access_watched());
++ if (from->is_field_modification_watched() || from->is_field_access_watched()) {
++ RC_TRACE(0x00000002, ("Transferred watch for field %s",
++ from->name()->as_C_string()));
++ }
++ update_klass_field_access_flag(to);
++}
++
++void VM_RedefineClasses::update_klass_field_access_flag(fieldDescriptor *fd) {
++ instanceKlass* ik = instanceKlass::cast(fd->field_holder());
++ FieldInfo* fi = FieldInfo::from_field_array(ik->fields(), fd->index());
++ fi->set_access_flags(fd->access_flags().as_short());
++}
++
++
+ // This internal class transfers the native function registration from old methods
+ // to new methods. It is designed to handle both the simple case of unchanged
+ // native methods and the complex cases of native method prefixes being added and/or
+@@ -2969,7 +3161,7 @@
+ // Same, caused by prefix removal only 3_2_1_m -> 3_2_m
+ //
+ class TransferNativeFunctionRegistration {
+- private:
++private:
+ instanceKlassHandle the_class;
+ int prefix_count;
+ char** prefixes;
+@@ -2982,42 +3174,42 @@
+ // (2) with the prefix.
+ // where 'prefix' is the prefix at that 'depth' (first prefix, second prefix,...)
+ methodOop search_prefix_name_space(int depth, char* name_str, size_t name_len,
+- Symbol* signature) {
+- TempNewSymbol name_symbol = SymbolTable::probe(name_str, (int)name_len);
+- if (name_symbol != NULL) {
+- methodOop method = Klass::cast(the_class())->lookup_method(name_symbol, signature);
+- if (method != NULL) {
+- // Even if prefixed, intermediate methods must exist.
+- if (method->is_native()) {
+- // Wahoo, we found a (possibly prefixed) version of the method, return it.
+- return method;
+- }
+- if (depth < prefix_count) {
+- // Try applying further prefixes (other than this one).
+- method = search_prefix_name_space(depth+1, name_str, name_len, signature);
+- if (method != NULL) {
+- return method; // found
++ Symbol* signature) {
++ Symbol* name_symbol = SymbolTable::probe(name_str, (int)name_len);
++ if (name_symbol != NULL) {
++ methodOop method = Klass::cast(the_class()->klass_part()->new_version())->lookup_method(name_symbol, signature);
++ if (method != NULL) {
++ // Even if prefixed, intermediate methods must exist.
++ if (method->is_native()) {
++ // Wahoo, we found a (possibly prefixed) version of the method, return it.
++ return method;
+ }
+-
+- // Try adding this prefix to the method name and see if it matches
+- // another method name.
+- char* prefix = prefixes[depth];
+- size_t prefix_len = strlen(prefix);
+- size_t trial_len = name_len + prefix_len;
+- char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
+- strcpy(trial_name_str, prefix);
+- strcat(trial_name_str, name_str);
+- method = search_prefix_name_space(depth+1, trial_name_str, trial_len,
+- signature);
+- if (method != NULL) {
+- // If found along this branch, it was prefixed, mark as such
+- method->set_is_prefixed_native();
+- return method; // found
++ if (depth < prefix_count) {
++ // Try applying further prefixes (other than this one).
++ method = search_prefix_name_space(depth+1, name_str, name_len, signature);
++ if (method != NULL) {
++ return method; // found
++ }
++
++ // Try adding this prefix to the method name and see if it matches
++ // another method name.
++ char* prefix = prefixes[depth];
++ size_t prefix_len = strlen(prefix);
++ size_t trial_len = name_len + prefix_len;
++ char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
++ strcpy(trial_name_str, prefix);
++ strcat(trial_name_str, name_str);
++ method = search_prefix_name_space(depth+1, trial_name_str, trial_len,
++ signature);
++ if (method != NULL) {
++ // If found along this branch, it was prefixed, mark as such
++ method->set_is_prefixed_native();
++ return method; // found
++ }
+ }
+ }
+ }
+- }
+- return NULL; // This whole branch bore nothing
++ return NULL; // This whole branch bore nothing
+ }
+
+ // Return the method name with old prefixes stripped away.
+@@ -3042,10 +3234,10 @@
+ ResourceMark rm;
+ char* name_str = method_name_without_prefixes(method);
+ return search_prefix_name_space(0, name_str, strlen(name_str),
+- method->signature());
++ method->signature());
+ }
+
+- public:
++public:
+
+ // Construct a native method transfer processor for this class.
+ TransferNativeFunctionRegistration(instanceKlassHandle _the_class) {
+@@ -3056,9 +3248,9 @@
+ }
+
+ // Attempt to transfer any of the old or deleted methods that are native
+- void transfer_registrations(methodOop* old_methods, int methods_length) {
++ void transfer_registrations(instanceKlassHandle old_klass, int* old_methods, int methods_length) {
+ for (int j = 0; j < methods_length; j++) {
+- methodOop old_method = old_methods[j];
++ methodOop old_method = (methodOop)old_klass->methods()->obj_at(old_methods[j]);
+
+ if (old_method->is_native() && old_method->has_native_function()) {
+ methodOop new_method = strip_and_search_for_new_native(old_method);
+@@ -3067,7 +3259,9 @@
+ // Redefine does not send events (except CFLH), certainly not this
+ // behind the scenes re-registration.
+ new_method->set_native_function(old_method->native_function(),
+- !methodOopDesc::native_bind_event_is_interesting);
++ !methodOopDesc::native_bind_event_is_interesting);
++
++ RC_TRACE(0x00008000, ("Transferring native function for method %s", old_method->name()->as_C_string()));
+ }
+ }
+ }
+@@ -3075,544 +3269,8 @@
+ };
+
+ // Don't lose the association between a native method and its JNI function.
+-void VM_RedefineClasses::transfer_old_native_function_registrations(instanceKlassHandle the_class) {
+- TransferNativeFunctionRegistration transfer(the_class);
+- transfer.transfer_registrations(_deleted_methods, _deleted_methods_length);
+- transfer.transfer_registrations(_matching_old_methods, _matching_methods_length);
++void VM_RedefineClasses::transfer_old_native_function_registrations(instanceKlassHandle old_klass) {
++ TransferNativeFunctionRegistration transfer(old_klass);
++ transfer.transfer_registrations(old_klass, _deleted_methods, _deleted_methods_length);
++ transfer.transfer_registrations(old_klass, _matching_old_methods, _matching_methods_length);
+ }
+-
+-// Deoptimize all compiled code that depends on this class.
+-//
+-// If the can_redefine_classes capability is obtained in the onload
+-// phase then the compiler has recorded all dependencies from startup.
+-// In that case we need only deoptimize and throw away all compiled code
+-// that depends on the class.
+-//
+-// If can_redefine_classes is obtained sometime after the onload
+-// phase then the dependency information may be incomplete. In that case
+-// the first call to RedefineClasses causes all compiled code to be
+-// thrown away. As can_redefine_classes has been obtained then
+-// all future compilations will record dependencies so second and
+-// subsequent calls to RedefineClasses need only throw away code
+-// that depends on the class.
+-//
+-void VM_RedefineClasses::flush_dependent_code(instanceKlassHandle k_h, TRAPS) {
+- assert_locked_or_safepoint(Compile_lock);
+-
+- // All dependencies have been recorded from startup or this is a second or
+- // subsequent use of RedefineClasses
+- if (JvmtiExport::all_dependencies_are_recorded()) {
+- Universe::flush_evol_dependents_on(k_h);
+- } else {
+- CodeCache::mark_all_nmethods_for_deoptimization();
+-
+- ResourceMark rm(THREAD);
+- DeoptimizationMarker dm;
+-
+- // Deoptimize all activations depending on marked nmethods
+- Deoptimization::deoptimize_dependents();
+-
+- // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies)
+- CodeCache::make_marked_nmethods_not_entrant();
+-
+- // From now on we know that the dependency information is complete
+- JvmtiExport::set_all_dependencies_are_recorded(true);
+- }
+-}
+-
+-void VM_RedefineClasses::compute_added_deleted_matching_methods() {
+- methodOop old_method;
+- methodOop new_method;
+-
+- _matching_old_methods = NEW_RESOURCE_ARRAY(methodOop, _old_methods->length());
+- _matching_new_methods = NEW_RESOURCE_ARRAY(methodOop, _old_methods->length());
+- _added_methods = NEW_RESOURCE_ARRAY(methodOop, _new_methods->length());
+- _deleted_methods = NEW_RESOURCE_ARRAY(methodOop, _old_methods->length());
+-
+- _matching_methods_length = 0;
+- _deleted_methods_length = 0;
+- _added_methods_length = 0;
+-
+- int nj = 0;
+- int oj = 0;
+- while (true) {
+- if (oj >= _old_methods->length()) {
+- if (nj >= _new_methods->length()) {
+- break; // we've looked at everything, done
+- }
+- // New method at the end
+- new_method = (methodOop) _new_methods->obj_at(nj);
+- _added_methods[_added_methods_length++] = new_method;
+- ++nj;
+- } else if (nj >= _new_methods->length()) {
+- // Old method, at the end, is deleted
+- old_method = (methodOop) _old_methods->obj_at(oj);
+- _deleted_methods[_deleted_methods_length++] = old_method;
+- ++oj;
+- } else {
+- old_method = (methodOop) _old_methods->obj_at(oj);
+- new_method = (methodOop) _new_methods->obj_at(nj);
+- if (old_method->name() == new_method->name()) {
+- if (old_method->signature() == new_method->signature()) {
+- _matching_old_methods[_matching_methods_length ] = old_method;
+- _matching_new_methods[_matching_methods_length++] = new_method;
+- ++nj;
+- ++oj;
+- } else {
+- // added overloaded have already been moved to the end,
+- // so this is a deleted overloaded method
+- _deleted_methods[_deleted_methods_length++] = old_method;
+- ++oj;
+- }
+- } else { // names don't match
+- if (old_method->name()->fast_compare(new_method->name()) > 0) {
+- // new method
+- _added_methods[_added_methods_length++] = new_method;
+- ++nj;
+- } else {
+- // deleted method
+- _deleted_methods[_deleted_methods_length++] = old_method;
+- ++oj;
+- }
+- }
+- }
+- }
+- assert(_matching_methods_length + _deleted_methods_length == _old_methods->length(), "sanity");
+- assert(_matching_methods_length + _added_methods_length == _new_methods->length(), "sanity");
+-}
+-
+-
+-
+-// Install the redefinition of a class:
+-// - house keeping (flushing breakpoints and caches, deoptimizing
+-// dependent compiled code)
+-// - replacing parts in the_class with parts from scratch_class
+-// - adding a weak reference to track the obsolete but interesting
+-// parts of the_class
+-// - adjusting constant pool caches and vtables in other classes
+-// that refer to methods in the_class. These adjustments use the
+-// SystemDictionary::classes_do() facility which only allows
+-// a helper method to be specified. The interesting parameters
+-// that we would like to pass to the helper method are saved in
+-// static global fields in the VM operation.
+-void VM_RedefineClasses::redefine_single_class(jclass the_jclass,
+- instanceKlassHandle scratch_class, TRAPS) {
+-
+- RC_TIMER_START(_timer_rsc_phase1);
+-
+- oop the_class_mirror = JNIHandles::resolve_non_null(the_jclass);
+- klassOop the_class_oop = java_lang_Class::as_klassOop(the_class_mirror);
+- instanceKlassHandle the_class = instanceKlassHandle(THREAD, the_class_oop);
+-
+- // Remove all breakpoints in methods of this class
+- JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
+- jvmti_breakpoints.clearall_in_class_at_safepoint(the_class_oop);
+-
+- if (the_class_oop == Universe::reflect_invoke_cache()->klass()) {
+- // We are redefining java.lang.reflect.Method. Method.invoke() is
+- // cached and users of the cache care about each active version of
+- // the method so we have to track this previous version.
+- // Do this before methods get switched
+- Universe::reflect_invoke_cache()->add_previous_version(
+- the_class->method_with_idnum(Universe::reflect_invoke_cache()->method_idnum()));
+- }
+-
+- // Deoptimize all compiled code that depends on this class
+- flush_dependent_code(the_class, THREAD);
+-
+- _old_methods = the_class->methods();
+- _new_methods = scratch_class->methods();
+- _the_class_oop = the_class_oop;
+- compute_added_deleted_matching_methods();
+- update_jmethod_ids();
+-
+- // Attach new constant pool to the original klass. The original
+- // klass still refers to the old constant pool (for now).
+- scratch_class->constants()->set_pool_holder(the_class());
+-
+-#if 0
+- // In theory, with constant pool merging in place we should be able
+- // to save space by using the new, merged constant pool in place of
+- // the old constant pool(s). By "pool(s)" I mean the constant pool in
+- // the klass version we are replacing now and any constant pool(s) in
+- // previous versions of klass. Nice theory, doesn't work in practice.
+- // When this code is enabled, even simple programs throw NullPointer
+- // exceptions. I'm guessing that this is caused by some constant pool
+- // cache difference between the new, merged constant pool and the
+- // constant pool that was just being used by the klass. I'm keeping
+- // this code around to archive the idea, but the code has to remain
+- // disabled for now.
+-
+- // Attach each old method to the new constant pool. This can be
+- // done here since we are past the bytecode verification and
+- // constant pool optimization phases.
+- for (int i = _old_methods->length() - 1; i >= 0; i--) {
+- methodOop method = (methodOop)_old_methods->obj_at(i);
+- method->set_constants(scratch_class->constants());
+- }
+-
+- {
+- // walk all previous versions of the klass
+- instanceKlass *ik = (instanceKlass *)the_class()->klass_part();
+- PreviousVersionWalker pvw(ik);
+- instanceKlassHandle ikh;
+- do {
+- ikh = pvw.next_previous_version();
+- if (!ikh.is_null()) {
+- ik = ikh();
+-
+- // attach previous version of klass to the new constant pool
+- ik->set_constants(scratch_class->constants());
+-
+- // Attach each method in the previous version of klass to the
+- // new constant pool
+- objArrayOop prev_methods = ik->methods();
+- for (int i = prev_methods->length() - 1; i >= 0; i--) {
+- methodOop method = (methodOop)prev_methods->obj_at(i);
+- method->set_constants(scratch_class->constants());
+- }
+- }
+- } while (!ikh.is_null());
+- }
+-#endif
+-
+- // Replace methods and constantpool
+- the_class->set_methods(_new_methods);
+- scratch_class->set_methods(_old_methods); // To prevent potential GCing of the old methods,
+- // and to be able to undo operation easily.
+-
+- constantPoolOop old_constants = the_class->constants();
+- the_class->set_constants(scratch_class->constants());
+- scratch_class->set_constants(old_constants); // See the previous comment.
+-#if 0
+- // We are swapping the guts of "the new class" with the guts of "the
+- // class". Since the old constant pool has just been attached to "the
+- // new class", it seems logical to set the pool holder in the old
+- // constant pool also. However, doing this will change the observable
+- // class hierarchy for any old methods that are still executing. A
+- // method can query the identity of its "holder" and this query uses
+- // the method's constant pool link to find the holder. The change in
+- // holding class from "the class" to "the new class" can confuse
+- // things.
+- //
+- // Setting the old constant pool's holder will also cause
+- // verification done during vtable initialization below to fail.
+- // During vtable initialization, the vtable's class is verified to be
+- // a subtype of the method's holder. The vtable's class is "the
+- // class" and the method's holder is gotten from the constant pool
+- // link in the method itself. For "the class"'s directly implemented
+- // methods, the method holder is "the class" itself (as gotten from
+- // the new constant pool). The check works fine in this case. The
+- // check also works fine for methods inherited from super classes.
+- //
+- // Miranda methods are a little more complicated. A miranda method is
+- // provided by an interface when the class implementing the interface
+- // does not provide its own method. These interfaces are implemented
+- // internally as an instanceKlass. These special instanceKlasses
+- // share the constant pool of the class that "implements" the
+- // interface. By sharing the constant pool, the method holder of a
+- // miranda method is the class that "implements" the interface. In a
+- // non-redefine situation, the subtype check works fine. However, if
+- // the old constant pool's pool holder is modified, then the check
+- // fails because there is no class hierarchy relationship between the
+- // vtable's class and "the new class".
+-
+- old_constants->set_pool_holder(scratch_class());
+-#endif
+-
+- // track which methods are EMCP for add_previous_version() call below
+- BitMap emcp_methods(_old_methods->length());
+- int emcp_method_count = 0;
+- emcp_methods.clear(); // clears 0..(length() - 1)
+- check_methods_and_mark_as_obsolete(&emcp_methods, &emcp_method_count);
+- transfer_old_native_function_registrations(the_class);
+-
+- // The class file bytes from before any retransformable agents mucked
+- // with them was cached on the scratch class, move to the_class.
+- // Note: we still want to do this if nothing needed caching since it
+- // should get cleared in the_class too.
+- if (the_class->get_cached_class_file_bytes() == 0) {
+- // the_class doesn't have a cache yet so copy it
+- the_class->set_cached_class_file(
+- scratch_class->get_cached_class_file_bytes(),
+- scratch_class->get_cached_class_file_len());
+- }
+-#ifndef PRODUCT
+- else {
+- assert(the_class->get_cached_class_file_bytes() ==
+- scratch_class->get_cached_class_file_bytes(), "cache ptrs must match");
+- assert(the_class->get_cached_class_file_len() ==
+- scratch_class->get_cached_class_file_len(), "cache lens must match");
+- }
+-#endif
+-
+- // Replace inner_classes
+- typeArrayOop old_inner_classes = the_class->inner_classes();
+- the_class->set_inner_classes(scratch_class->inner_classes());
+- scratch_class->set_inner_classes(old_inner_classes);
+-
+- // Initialize the vtable and interface table after
+- // methods have been rewritten
+- {
+- ResourceMark rm(THREAD);
+- // no exception should happen here since we explicitly
+- // do not check loader constraints.
+- // compare_and_normalize_class_versions has already checked:
+- // - classloaders unchanged, signatures unchanged
+- // - all instanceKlasses for redefined classes reused & contents updated
+- the_class->vtable()->initialize_vtable(false, THREAD);
+- the_class->itable()->initialize_itable(false, THREAD);
+- assert(!HAS_PENDING_EXCEPTION || (THREAD->pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())), "redefine exception");
+- }
+-
+- // Leave arrays of jmethodIDs and itable index cache unchanged
+-
+- // Copy the "source file name" attribute from new class version
+- the_class->set_source_file_name(scratch_class->source_file_name());
+-
+- // Copy the "source debug extension" attribute from new class version
+- the_class->set_source_debug_extension(
+- scratch_class->source_debug_extension(),
+- scratch_class->source_debug_extension() == NULL ? 0 :
+- (int)strlen(scratch_class->source_debug_extension()));
+-
+- // Use of javac -g could be different in the old and the new
+- if (scratch_class->access_flags().has_localvariable_table() !=
+- the_class->access_flags().has_localvariable_table()) {
+-
+- AccessFlags flags = the_class->access_flags();
+- if (scratch_class->access_flags().has_localvariable_table()) {
+- flags.set_has_localvariable_table();
+- } else {
+- flags.clear_has_localvariable_table();
+- }
+- the_class->set_access_flags(flags);
+- }
+-
+- // Replace class annotation fields values
+- typeArrayOop old_class_annotations = the_class->class_annotations();
+- the_class->set_class_annotations(scratch_class->class_annotations());
+- scratch_class->set_class_annotations(old_class_annotations);
+-
+- // Replace fields annotation fields values
+- objArrayOop old_fields_annotations = the_class->fields_annotations();
+- the_class->set_fields_annotations(scratch_class->fields_annotations());
+- scratch_class->set_fields_annotations(old_fields_annotations);
+-
+- // Replace methods annotation fields values
+- objArrayOop old_methods_annotations = the_class->methods_annotations();
+- the_class->set_methods_annotations(scratch_class->methods_annotations());
+- scratch_class->set_methods_annotations(old_methods_annotations);
+-
+- // Replace methods parameter annotation fields values
+- objArrayOop old_methods_parameter_annotations =
+- the_class->methods_parameter_annotations();
+- the_class->set_methods_parameter_annotations(
+- scratch_class->methods_parameter_annotations());
+- scratch_class->set_methods_parameter_annotations(old_methods_parameter_annotations);
+-
+- // Replace methods default annotation fields values
+- objArrayOop old_methods_default_annotations =
+- the_class->methods_default_annotations();
+- the_class->set_methods_default_annotations(
+- scratch_class->methods_default_annotations());
+- scratch_class->set_methods_default_annotations(old_methods_default_annotations);
+-
+- // Replace minor version number of class file
+- u2 old_minor_version = the_class->minor_version();
+- the_class->set_minor_version(scratch_class->minor_version());
+- scratch_class->set_minor_version(old_minor_version);
+-
+- // Replace major version number of class file
+- u2 old_major_version = the_class->major_version();
+- the_class->set_major_version(scratch_class->major_version());
+- scratch_class->set_major_version(old_major_version);
+-
+- // Replace CP indexes for class and name+type of enclosing method
+- u2 old_class_idx = the_class->enclosing_method_class_index();
+- u2 old_method_idx = the_class->enclosing_method_method_index();
+- the_class->set_enclosing_method_indices(
+- scratch_class->enclosing_method_class_index(),
+- scratch_class->enclosing_method_method_index());
+- scratch_class->set_enclosing_method_indices(old_class_idx, old_method_idx);
+-
+- // keep track of previous versions of this class
+- the_class->add_previous_version(scratch_class, &emcp_methods,
+- emcp_method_count);
+-
+- RC_TIMER_STOP(_timer_rsc_phase1);
+- RC_TIMER_START(_timer_rsc_phase2);
+-
+- // Adjust constantpool caches and vtables for all classes
+- // that reference methods of the evolved class.
+- SystemDictionary::classes_do(adjust_cpool_cache_and_vtable, THREAD);
+-
+- // JSR-292 support
+- MemberNameTable* mnt = the_class->member_names();
+- if (mnt != NULL) {
+- bool trace_name_printed = false;
+- mnt->adjust_method_entries(_matching_old_methods,
+- _matching_new_methods,
+- _matching_methods_length,
+- &trace_name_printed);
+- }
+-
+- if (the_class->oop_map_cache() != NULL) {
+- // Flush references to any obsolete methods from the oop map cache
+- // so that obsolete methods are not pinned.
+- the_class->oop_map_cache()->flush_obsolete_entries();
+- }
+-
+- // increment the classRedefinedCount field in the_class and in any
+- // direct and indirect subclasses of the_class
+- increment_class_counter((instanceKlass *)the_class()->klass_part(), THREAD);
+-
+- // RC_TRACE macro has an embedded ResourceMark
+- RC_TRACE_WITH_THREAD(0x00000001, THREAD,
+- ("redefined name=%s, count=%d (avail_mem=" UINT64_FORMAT "K)",
+- the_class->external_name(),
+- java_lang_Class::classRedefinedCount(the_class_mirror),
+- os::available_memory() >> 10));
+-
+- RC_TIMER_STOP(_timer_rsc_phase2);
+-} // end redefine_single_class()
+-
+-
+-// Increment the classRedefinedCount field in the specific instanceKlass
+-// and in all direct and indirect subclasses.
+-void VM_RedefineClasses::increment_class_counter(instanceKlass *ik, TRAPS) {
+- oop class_mirror = ik->java_mirror();
+- klassOop class_oop = java_lang_Class::as_klassOop(class_mirror);
+- int new_count = java_lang_Class::classRedefinedCount(class_mirror) + 1;
+- java_lang_Class::set_classRedefinedCount(class_mirror, new_count);
+-
+- if (class_oop != _the_class_oop) {
+- // _the_class_oop count is printed at end of redefine_single_class()
+- RC_TRACE_WITH_THREAD(0x00000008, THREAD,
+- ("updated count in subclass=%s to %d", ik->external_name(), new_count));
+- }
+-
+- for (Klass *subk = ik->subklass(); subk != NULL;
+- subk = subk->next_sibling()) {
+- if (subk->oop_is_instance()) {
+- // Only update instanceKlasses
+- instanceKlass *subik = (instanceKlass*)subk;
+- // recursively do subclasses of the current subclass
+- increment_class_counter(subik, THREAD);
+- }
+- }
+-}
+-
+-void VM_RedefineClasses::check_class(klassOop k_oop,
+- oop initiating_loader, TRAPS) {
+- Klass *k = k_oop->klass_part();
+- if (k->oop_is_instance()) {
+- HandleMark hm(THREAD);
+- instanceKlass *ik = (instanceKlass *) k;
+- bool no_old_methods = true; // be optimistic
+- ResourceMark rm(THREAD);
+-
+- // a vtable should never contain old or obsolete methods
+- if (ik->vtable_length() > 0 &&
+- !ik->vtable()->check_no_old_or_obsolete_entries()) {
+- if (RC_TRACE_ENABLED(0x00004000)) {
+- RC_TRACE_WITH_THREAD(0x00004000, THREAD,
+- ("klassVtable::check_no_old_or_obsolete_entries failure"
+- " -- OLD or OBSOLETE method found -- class: %s",
+- ik->signature_name()));
+- ik->vtable()->dump_vtable();
+- }
+- no_old_methods = false;
+- }
+-
+- // an itable should never contain old or obsolete methods
+- if (ik->itable_length() > 0 &&
+- !ik->itable()->check_no_old_or_obsolete_entries()) {
+- if (RC_TRACE_ENABLED(0x00004000)) {
+- RC_TRACE_WITH_THREAD(0x00004000, THREAD,
+- ("klassItable::check_no_old_or_obsolete_entries failure"
+- " -- OLD or OBSOLETE method found -- class: %s",
+- ik->signature_name()));
+- ik->itable()->dump_itable();
+- }
+- no_old_methods = false;
+- }
+-
+- // the constant pool cache should never contain old or obsolete methods
+- if (ik->constants() != NULL &&
+- ik->constants()->cache() != NULL &&
+- !ik->constants()->cache()->check_no_old_or_obsolete_entries()) {
+- if (RC_TRACE_ENABLED(0x00004000)) {
+- RC_TRACE_WITH_THREAD(0x00004000, THREAD,
+- ("cp-cache::check_no_old_or_obsolete_entries failure"
+- " -- OLD or OBSOLETE method found -- class: %s",
+- ik->signature_name()));
+- ik->constants()->cache()->dump_cache();
+- }
+- no_old_methods = false;
+- }
+-
+- if (!no_old_methods) {
+- if (RC_TRACE_ENABLED(0x00004000)) {
+- dump_methods();
+- } else {
+- tty->print_cr("INFO: use the '-XX:TraceRedefineClasses=16384' option "
+- "to see more info about the following guarantee() failure.");
+- }
+- guarantee(false, "OLD and/or OBSOLETE method(s) found");
+- }
+- }
+-}
+-
+-void VM_RedefineClasses::dump_methods() {
+- int j;
+- RC_TRACE(0x00004000, ("_old_methods --"));
+- for (j = 0; j < _old_methods->length(); ++j) {
+- methodOop m = (methodOop) _old_methods->obj_at(j);
+- RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index()));
+- m->access_flags().print_on(tty);
+- tty->print(" -- ");
+- m->print_name(tty);
+- tty->cr();
+- }
+- RC_TRACE(0x00004000, ("_new_methods --"));
+- for (j = 0; j < _new_methods->length(); ++j) {
+- methodOop m = (methodOop) _new_methods->obj_at(j);
+- RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index()));
+- m->access_flags().print_on(tty);
+- tty->print(" -- ");
+- m->print_name(tty);
+- tty->cr();
+- }
+- RC_TRACE(0x00004000, ("_matching_(old/new)_methods --"));
+- for (j = 0; j < _matching_methods_length; ++j) {
+- methodOop m = _matching_old_methods[j];
+- RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index()));
+- m->access_flags().print_on(tty);
+- tty->print(" -- ");
+- m->print_name(tty);
+- tty->cr();
+- m = _matching_new_methods[j];
+- RC_TRACE_NO_CR(0x00004000, (" (%5d) ", m->vtable_index()));
+- m->access_flags().print_on(tty);
+- tty->cr();
+- }
+- RC_TRACE(0x00004000, ("_deleted_methods --"));
+- for (j = 0; j < _deleted_methods_length; ++j) {
+- methodOop m = _deleted_methods[j];
+- RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index()));
+- m->access_flags().print_on(tty);
+- tty->print(" -- ");
+- m->print_name(tty);
+- tty->cr();
+- }
+- RC_TRACE(0x00004000, ("_added_methods --"));
+- for (j = 0; j < _added_methods_length; ++j) {
+- methodOop m = _added_methods[j];
+- RC_TRACE_NO_CR(0x00004000, ("%4d (%5d) ", j, m->vtable_index()));
+- m->access_flags().print_on(tty);
+- tty->print(" -- ");
+- m->print_name(tty);
+- tty->cr();
+- }
+-}
+diff -r 882f6c762ac5 src/share/vm/prims/jvmtiRedefineClasses.hpp
+--- a/src/share/vm/prims/jvmtiRedefineClasses.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/prims/jvmtiRedefineClasses.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -1,26 +1,29 @@
+ /*
+- * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
+- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+- *
+- * This code is free software; you can redistribute it and/or modify it
+- * under the terms of the GNU General Public License version 2 only, as
+- * published by the Free Software Foundation.
+- *
+- * This code is distributed in the hope that it will be useful, but WITHOUT
+- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+- * version 2 for more details (a copy is included in the LICENSE file that
+- * accompanied this code).
+- *
+- * You should have received a copy of the GNU General Public License version
+- * 2 along with this work; if not, write to the Free Software Foundation,
+- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+- *
+- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+- * or visit www.oracle.com if you need additional information or have any
+- * questions.
+- *
+- */
++* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
++* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
++*
++* This code is free software; you can redistribute it and/or modify it
++* under the terms of the GNU General Public License version 2 only, as
++* published by the Free Software Foundation.
++*
++* This code is distributed in the hope that it will be useful, but WITHOUT
++* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
++* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
++* version 2 for more details (a copy is included in the LICENSE file that
++* accompanied this code).
++*
++* You should have received a copy of the GNU General Public License version
++* 2 along with this work; if not, write to the Free Software Foundation,
++* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
++*
++* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
++* or visit www.oracle.com if you need additional information or have any
++* questions.
++*
++*/
++
++// New version that allows arbitrary changes to already loaded classes.
++// Modifications done by: Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
+
+ #ifndef SHARE_VM_PRIMS_JVMTIREDEFINECLASSES_HPP
+ #define SHARE_VM_PRIMS_JVMTIREDEFINECLASSES_HPP
+@@ -32,331 +35,28 @@
+ #include "oops/objArrayOop.hpp"
+ #include "prims/jvmtiRedefineClassesTrace.hpp"
+ #include "runtime/vm_operations.hpp"
++#include "gc_implementation/shared/vmGCOperations.hpp"
+
+-// Introduction:
+-//
+-// The RedefineClasses() API is used to change the definition of one or
+-// more classes. While the API supports redefining more than one class
+-// in a single call, in general, the API is discussed in the context of
+-// changing the definition of a single current class to a single new
+-// class. For clarity, the current class is will always be called
+-// "the_class" and the new class will always be called "scratch_class".
+-//
+-// The name "the_class" is used because there is only one structure
+-// that represents a specific class; redefinition does not replace the
+-// structure, but instead replaces parts of the structure. The name
+-// "scratch_class" is used because the structure that represents the
+-// new definition of a specific class is simply used to carry around
+-// the parts of the new definition until they are used to replace the
+-// appropriate parts in the_class. Once redefinition of a class is
+-// complete, scratch_class is thrown away.
+-//
+-//
+-// Implementation Overview:
+-//
+-// The RedefineClasses() API is mostly a wrapper around the VM op that
+-// does the real work. The work is split in varying degrees between
+-// doit_prologue(), doit() and doit_epilogue().
+-//
+-// 1) doit_prologue() is called by the JavaThread on the way to a
+-// safepoint. It does parameter verification and loads scratch_class
+-// which involves:
+-// - parsing the incoming class definition using the_class' class
+-// loader and security context
+-// - linking scratch_class
+-// - merging constant pools and rewriting bytecodes as needed
+-// for the merged constant pool
+-// - verifying the bytecodes in scratch_class
+-// - setting up the constant pool cache and rewriting bytecodes
+-// as needed to use the cache
+-// - finally, scratch_class is compared to the_class to verify
+-// that it is a valid replacement class
+-// - if everything is good, then scratch_class is saved in an
+-// instance field in the VM operation for the doit() call
+-//
+-// Note: A JavaThread must do the above work.
+-//
+-// 2) doit() is called by the VMThread during a safepoint. It installs
+-// the new class definition(s) which involves:
+-// - retrieving the scratch_class from the instance field in the
+-// VM operation
+-// - house keeping (flushing breakpoints and caches, deoptimizing
+-// dependent compiled code)
+-// - replacing parts in the_class with parts from scratch_class
+-// - adding weak reference(s) to track the obsolete but interesting
+-// parts of the_class
+-// - adjusting constant pool caches and vtables in other classes
+-// that refer to methods in the_class. These adjustments use the
+-// SystemDictionary::classes_do() facility which only allows
+-// a helper method to be specified. The interesting parameters
+-// that we would like to pass to the helper method are saved in
+-// static global fields in the VM operation.
+-// - telling the SystemDictionary to notice our changes
+-//
+-// Note: the above work must be done by the VMThread to be safe.
+-//
+-// 3) doit_epilogue() is called by the JavaThread after the VM op
+-// is finished and the safepoint is done. It simply cleans up
+-// memory allocated in doit_prologue() and used in doit().
+-//
+-//
+-// Constant Pool Details:
+-//
+-// When the_class is redefined, we cannot just replace the constant
+-// pool in the_class with the constant pool from scratch_class because
+-// that could confuse obsolete methods that may still be running.
+-// Instead, the constant pool from the_class, old_cp, is merged with
+-// the constant pool from scratch_class, scratch_cp. The resulting
+-// constant pool, merge_cp, replaces old_cp in the_class.
+-//
+-// The key part of any merging algorithm is the entry comparison
+-// function so we have to know the types of entries in a constant pool
+-// in order to merge two of them together. Constant pools can contain
+-// up to 12 different kinds of entries; the JVM_CONSTANT_Unicode entry
+-// is not presently used so we only have to worry about the other 11
+-// entry types. For the purposes of constant pool merging, it is
+-// helpful to know that the 11 entry types fall into 3 different
+-// subtypes: "direct", "indirect" and "double-indirect".
+-//
+-// Direct CP entries contain data and do not contain references to
+-// other CP entries. The following are direct CP entries:
+-// JVM_CONSTANT_{Double,Float,Integer,Long,Utf8}
+-//
+-// Indirect CP entries contain 1 or 2 references to a direct CP entry
+-// and no other data. The following are indirect CP entries:
+-// JVM_CONSTANT_{Class,NameAndType,String}
+-//
+-// Double-indirect CP entries contain two references to indirect CP
+-// entries and no other data. The following are double-indirect CP
+-// entries:
+-// JVM_CONSTANT_{Fieldref,InterfaceMethodref,Methodref}
+-//
+-// When comparing entries between two constant pools, the entry types
+-// are compared first and if they match, then further comparisons are
+-// made depending on the entry subtype. Comparing direct CP entries is
+-// simply a matter of comparing the data associated with each entry.
+-// Comparing both indirect and double-indirect CP entries requires
+-// recursion.
+-//
+-// Fortunately, the recursive combinations are limited because indirect
+-// CP entries can only refer to direct CP entries and double-indirect
+-// CP entries can only refer to indirect CP entries. The following is
+-// an example illustration of the deepest set of indirections needed to
+-// access the data associated with a JVM_CONSTANT_Fieldref entry:
+-//
+-// JVM_CONSTANT_Fieldref {
+-// class_index => JVM_CONSTANT_Class {
+-// name_index => JVM_CONSTANT_Utf8 {
+-// <data-1>
+-// }
+-// }
+-// name_and_type_index => JVM_CONSTANT_NameAndType {
+-// name_index => JVM_CONSTANT_Utf8 {
+-// <data-2>
+-// }
+-// descriptor_index => JVM_CONSTANT_Utf8 {
+-// <data-3>
+-// }
+-// }
+-// }
+-//
+-// The above illustration is not a data structure definition for any
+-// computer language. The curly braces ('{' and '}') are meant to
+-// delimit the context of the "fields" in the CP entry types shown.
+-// Each indirection from the JVM_CONSTANT_Fieldref entry is shown via
+-// "=>", e.g., the class_index is used to indirectly reference a
+-// JVM_CONSTANT_Class entry where the name_index is used to indirectly
+-// reference a JVM_CONSTANT_Utf8 entry which contains the interesting
+-// <data-1>. In order to understand a JVM_CONSTANT_Fieldref entry, we
+-// have to do a total of 5 indirections just to get to the CP entries
+-// that contain the interesting pieces of data and then we have to
+-// fetch the three pieces of data. This means we have to do a total of
+-// (5 + 3) * 2 == 16 dereferences to compare two JVM_CONSTANT_Fieldref
+-// entries.
+-//
+-// Here is the indirection, data and dereference count for each entry
+-// type:
+-//
+-// JVM_CONSTANT_Class 1 indir, 1 data, 2 derefs
+-// JVM_CONSTANT_Double 0 indir, 1 data, 1 deref
+-// JVM_CONSTANT_Fieldref 2 indir, 3 data, 8 derefs
+-// JVM_CONSTANT_Float 0 indir, 1 data, 1 deref
+-// JVM_CONSTANT_Integer 0 indir, 1 data, 1 deref
+-// JVM_CONSTANT_InterfaceMethodref 2 indir, 3 data, 8 derefs
+-// JVM_CONSTANT_Long 0 indir, 1 data, 1 deref
+-// JVM_CONSTANT_Methodref 2 indir, 3 data, 8 derefs
+-// JVM_CONSTANT_NameAndType 1 indir, 2 data, 4 derefs
+-// JVM_CONSTANT_String 1 indir, 1 data, 2 derefs
+-// JVM_CONSTANT_Utf8 0 indir, 1 data, 1 deref
+-//
+-// So different subtypes of CP entries require different amounts of
+-// work for a proper comparison.
+-//
+-// Now that we've talked about the different entry types and how to
+-// compare them we need to get back to merging. This is not a merge in
+-// the "sort -u" sense or even in the "sort" sense. When we merge two
+-// constant pools, we copy all the entries from old_cp to merge_cp,
+-// preserving entry order. Next we append all the unique entries from
+-// scratch_cp to merge_cp and we track the index changes from the
+-// location in scratch_cp to the possibly new location in merge_cp.
+-// When we are done, any obsolete code that is still running that
+-// uses old_cp should not be able to observe any difference if it
+-// were to use merge_cp. As for the new code in scratch_class, it is
+-// modified to use the appropriate index values in merge_cp before it
+-// is used to replace the code in the_class.
+-//
+-// There is one small complication in copying the entries from old_cp
+-// to merge_cp. Two of the CP entry types are special in that they are
+-// lazily resolved. Before explaining the copying complication, we need
+-// to digress into CP entry resolution.
+-//
+-// JVM_CONSTANT_Class and JVM_CONSTANT_String entries are present in
+-// the class file, but are not stored in memory as such until they are
+-// resolved. The entries are not resolved unless they are used because
+-// resolution is expensive. During class file parsing the entries are
+-// initially stored in memory as JVM_CONSTANT_ClassIndex and
+-// JVM_CONSTANT_StringIndex entries. These special CP entry types
+-// indicate that the JVM_CONSTANT_Class and JVM_CONSTANT_String entries
+-// have been parsed, but the index values in the entries have not been
+-// validated. After the entire constant pool has been parsed, the index
+-// values can be validated and then the entries are converted into
+-// JVM_CONSTANT_UnresolvedClass and JVM_CONSTANT_UnresolvedString
+-// entries. During this conversion process, the UTF8 values that are
+-// indirectly referenced by the JVM_CONSTANT_ClassIndex and
+-// JVM_CONSTANT_StringIndex entries are changed into Symbol*s and the
+-// entries are modified to refer to the Symbol*s. This optimization
+-// eliminates one level of indirection for those two CP entry types and
+-// gets the entries ready for verification. During class file parsing
+-// it is also possible for JVM_CONSTANT_UnresolvedString entries to be
+-// resolved into JVM_CONSTANT_String entries. Verification expects to
+-// find JVM_CONSTANT_UnresolvedClass and either JVM_CONSTANT_String or
+-// JVM_CONSTANT_UnresolvedString entries and not JVM_CONSTANT_Class
+-// entries.
+-//
+-// Now we can get back to the copying complication. When we copy
+-// entries from old_cp to merge_cp, we have to revert any
+-// JVM_CONSTANT_Class entries to JVM_CONSTANT_UnresolvedClass entries
+-// or verification will fail.
+-//
+-// It is important to explicitly state that the merging algorithm
+-// effectively unresolves JVM_CONSTANT_Class entries that were in the
+-// old_cp when they are changed into JVM_CONSTANT_UnresolvedClass
+-// entries in the merge_cp. This is done both to make verification
+-// happy and to avoid adding more brittleness between RedefineClasses
+-// and the constant pool cache. By allowing the constant pool cache
+-// implementation to (re)resolve JVM_CONSTANT_UnresolvedClass entries
+-// into JVM_CONSTANT_Class entries, we avoid having to embed knowledge
+-// about those algorithms in RedefineClasses.
+-//
+-// Appending unique entries from scratch_cp to merge_cp is straight
+-// forward for direct CP entries and most indirect CP entries. For the
+-// indirect CP entry type JVM_CONSTANT_NameAndType and for the double-
+-// indirect CP entry types, the presence of more than one piece of
+-// interesting data makes appending the entries more complicated.
+-//
+-// For the JVM_CONSTANT_{Double,Float,Integer,Long,Utf8} entry types,
+-// the entry is simply copied from scratch_cp to the end of merge_cp.
+-// If the index in scratch_cp is different than the destination index
+-// in merge_cp, then the change in index value is tracked.
+-//
+-// Note: the above discussion for the direct CP entries also applies
+-// to the JVM_CONSTANT_Unresolved{Class,String} entry types.
+-//
+-// For the JVM_CONSTANT_{Class,String} entry types, since there is only
+-// one data element at the end of the recursion, we know that we have
+-// either one or two unique entries. If the JVM_CONSTANT_Utf8 entry is
+-// unique then it is appended to merge_cp before the current entry.
+-// If the JVM_CONSTANT_Utf8 entry is not unique, then the current entry
+-// is updated to refer to the duplicate entry in merge_cp before it is
+-// appended to merge_cp. Again, any changes in index values are tracked
+-// as needed.
+-//
+-// Note: the above discussion for JVM_CONSTANT_{Class,String} entry
+-// types is theoretical. Since those entry types have already been
+-// optimized into JVM_CONSTANT_Unresolved{Class,String} entry types,
+-// they are handled as direct CP entries.
+-//
+-// For the JVM_CONSTANT_NameAndType entry type, since there are two
+-// data elements at the end of the recursions, we know that we have
+-// between one and three unique entries. Any unique JVM_CONSTANT_Utf8
+-// entries are appended to merge_cp before the current entry. For any
+-// JVM_CONSTANT_Utf8 entries that are not unique, the current entry is
+-// updated to refer to the duplicate entry in merge_cp before it is
+-// appended to merge_cp. Again, any changes in index values are tracked
+-// as needed.
+-//
+-// For the JVM_CONSTANT_{Fieldref,InterfaceMethodref,Methodref} entry
+-// types, since there are two indirect CP entries and three data
+-// elements at the end of the recursions, we know that we have between
+-// one and six unique entries. See the JVM_CONSTANT_Fieldref diagram
+-// above for an example of all six entries. The uniqueness algorithm
+-// for the JVM_CONSTANT_Class and JVM_CONSTANT_NameAndType entries is
+-// covered above. Any unique entries are appended to merge_cp before
+-// the current entry. For any entries that are not unique, the current
+-// entry is updated to refer to the duplicate entry in merge_cp before
+-// it is appended to merge_cp. Again, any changes in index values are
+-// tracked as needed.
+-//
+-//
+-// Other Details:
+-//
+-// Details for other parts of RedefineClasses need to be written.
+-// This is a placeholder section.
+-//
+-//
+-// Open Issues (in no particular order):
+-//
+-// - How do we serialize the RedefineClasses() API without deadlocking?
+-//
+-// - SystemDictionary::parse_stream() was called with a NULL protection
+-// domain since the initial version. This has been changed to pass
+-// the_class->protection_domain(). This change has been tested with
+-// all NSK tests and nothing broke, but what will adding it now break
+-// in ways that we don't test?
+-//
+-// - GenerateOopMap::rewrite_load_or_store() has a comment in its
+-// (indirect) use of the Relocator class that the max instruction
+-// size is 4 bytes. goto_w and jsr_w are 5 bytes and wide/iinc is
+-// 6 bytes. Perhaps Relocator only needs a 4 byte buffer to do
+-// what it does to the bytecodes. More investigation is needed.
+-//
+-// - java.lang.Object methods can be called on arrays. This is
+-// implemented via the arrayKlassOop vtable which we don't
+-// update. For example, if we redefine java.lang.Object.toString(),
+-// then the new version of the method will not be called for array
+-// objects.
+-//
+-// - How do we know if redefine_single_class() and the guts of
+-// instanceKlass are out of sync? I don't think this can be
+-// automated, but we should probably order the work in
+-// redefine_single_class() to match the order of field
+-// definitions in instanceKlass. We also need to add some
+-// comments about keeping things in sync.
+-//
+-// - set_new_constant_pool() is huge and we should consider refactoring
+-// it into smaller chunks of work.
+-//
+-// - The exception table update code in set_new_constant_pool() defines
+-// const values that are also defined in a local context elsewhere.
+-// The same literal values are also used in elsewhere. We need to
+-// coordinate a cleanup of these constants with Runtime.
+-//
++#define RC_ABORT(error) { _result = error; return false; }
+
+-class VM_RedefineClasses: public VM_Operation {
++class VM_RedefineClasses: public VM_GC_Operation {
+ private:
++
+ // These static fields are needed by SystemDictionary::classes_do()
+ // facility and the adjust_cpool_cache_and_vtable() helper:
+ static objArrayOop _old_methods;
+ static objArrayOop _new_methods;
+- static methodOop* _matching_old_methods;
+- static methodOop* _matching_new_methods;
+- static methodOop* _deleted_methods;
+- static methodOop* _added_methods;
++ static int* _matching_old_methods;
++ static int* _matching_new_methods;
++ static int* _deleted_methods;
++ static int* _added_methods;
+ static int _matching_methods_length;
+ static int _deleted_methods_length;
+ static int _added_methods_length;
+ static klassOop _the_class_oop;
+
++ static int _revision_number;
++
+ // The instance fields are used to pass information from
+ // doit_prologue() to doit() and doit_epilogue().
+ jint _class_count;
+@@ -370,43 +70,29 @@
+ // _index_map_p contains any entries.
+ int _index_map_count;
+ intArray * _index_map_p;
+-
+- // _operands_index_map_count is just an optimization for knowing if
+- // _operands_index_map_p contains any entries.
+- int _operands_cur_length;
+- int _operands_index_map_count;
+- intArray * _operands_index_map_p;
+-
+- // ptr to _class_count scratch_classes
+- instanceKlassHandle * _scratch_classes;
+- jvmtiError _res;
++ GrowableArray<instanceKlassHandle>* _new_classes;
++ GrowableArray<oop>* _updated_oops;
++ jvmtiError _result;
++ int _max_redefinition_flags;
+
+ // Performance measurement support. These timers do not cover all
+ // the work done for JVM/TI RedefineClasses() but they do cover
+ // the heavy lifting.
+- elapsedTimer _timer_rsc_phase1;
+- elapsedTimer _timer_rsc_phase2;
+- elapsedTimer _timer_vm_op_prologue;
++ elapsedTimer _timer_total;
++ elapsedTimer _timer_prologue;
++ elapsedTimer _timer_class_linking;
++ elapsedTimer _timer_class_loading;
++ elapsedTimer _timer_check_type;
++ elapsedTimer _timer_prepare_redefinition;
++ elapsedTimer _timer_wait_for_locks;
++ elapsedTimer _timer_redefinition;
++ elapsedTimer _timer_vm_op_epilogue;
+
+- // These routines are roughly in call order unless otherwise noted.
+-
+- // Load the caller's new class definition(s) into _scratch_classes.
+- // Constant pool merging work is done here as needed. Also calls
+- // compare_and_normalize_class_versions() to verify the class
+- // definition(s).
++ jvmtiError check_redefinition_allowed(instanceKlassHandle new_class);
++ jvmtiError find_sorted_affected_classes(GrowableArray<instanceKlassHandle> *all_affected_klasses);
++ jvmtiError find_class_bytes(instanceKlassHandle the_class, const unsigned char **class_bytes, jint *class_byte_count, jboolean *not_changed);
+ jvmtiError load_new_class_versions(TRAPS);
+
+- // Verify that the caller provided class definition(s) that meet
+- // the restrictions of RedefineClasses. Normalize the order of
+- // overloaded methods as needed.
+- jvmtiError compare_and_normalize_class_versions(
+- instanceKlassHandle the_class, instanceKlassHandle scratch_class);
+-
+- // Swap annotations[i] with annotations[j]
+- // Used by compare_and_normalize_class_versions() when normalizing
+- // overloaded methods or changing idnum as when adding or deleting methods.
+- void swap_all_method_annotations(int i, int j, instanceKlassHandle scratch_class);
+-
+ // Figure out which new methods match old methods in name and signature,
+ // which methods have been added, and which are no longer present
+ void compute_added_deleted_matching_methods();
+@@ -414,103 +100,99 @@
+ // Change jmethodIDs to point to the new methods
+ void update_jmethod_ids();
+
+- // In addition to marking methods as obsolete, this routine
+- // records which methods are EMCP (Equivalent Module Constant
+- // Pool) in the emcp_methods BitMap and returns the number of
+- // EMCP methods via emcp_method_count_p. This information is
+- // used when information about the previous version of the_class
+- // is squirreled away.
+- void check_methods_and_mark_as_obsolete(BitMap *emcp_methods,
+- int * emcp_method_count_p);
+- void transfer_old_native_function_registrations(instanceKlassHandle the_class);
++ class FindAffectedKlassesClosure : public ObjectClosure {
+
+- // Unevolving classes may point to methods of the_class directly
+- // from their constant pool caches, itables, and/or vtables. We
+- // use the SystemDictionary::classes_do() facility and this helper
+- // to fix up these pointers.
+- static void adjust_cpool_cache_and_vtable(klassOop k_oop, oop loader, TRAPS);
++ private:
++ GrowableArray<instanceKlassHandle> *_original_klasses;
++ GrowableArray<instanceKlassHandle> *_result;
++
++ public:
++ FindAffectedKlassesClosure(GrowableArray<instanceKlassHandle> *original_klasses, GrowableArray<instanceKlassHandle> *result);
++
++ virtual void do_object(oop obj);
++ };
++
++
++ static jvmtiError do_topological_class_sorting(const jvmtiClassDefinition *class_definitions, int class_count, GrowableArray<instanceKlassHandle> *affected, GrowableArray<instanceKlassHandle> *arr, TRAPS);
+
+ // Install the redefinition of a class
+- void redefine_single_class(jclass the_jclass,
+- instanceKlassHandle scratch_class, TRAPS);
++ void redefine_single_class(instanceKlassHandle the_new_class, TRAPS);
+
+ // Increment the classRedefinedCount field in the specific instanceKlass
+ // and in all direct and indirect subclasses.
+ void increment_class_counter(instanceKlass *ik, TRAPS);
+
+- // Support for constant pool merging (these routines are in alpha order):
+- void append_entry(constantPoolHandle scratch_cp, int scratch_i,
+- constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS);
+- void append_operand(constantPoolHandle scratch_cp, int scratch_bootstrap_spec_index,
+- constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS);
+- void finalize_operands_merge(constantPoolHandle merge_cp, TRAPS);
+- int find_or_append_indirect_entry(constantPoolHandle scratch_cp, int scratch_i,
+- constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS);
+- int find_or_append_operand(constantPoolHandle scratch_cp, int scratch_bootstrap_spec_index,
+- constantPoolHandle *merge_cp_p, int *merge_cp_length_p, TRAPS);
+- int find_new_index(int old_index);
+- int find_new_operand_index(int old_bootstrap_spec_index);
+- bool is_unresolved_class_mismatch(constantPoolHandle cp1, int index1,
+- constantPoolHandle cp2, int index2);
+- bool is_unresolved_string_mismatch(constantPoolHandle cp1, int index1,
+- constantPoolHandle cp2, int index2);
+- void map_index(constantPoolHandle scratch_cp, int old_index, int new_index);
+- void map_operand_index(int old_bootstrap_spec_index, int new_bootstrap_spec_index);
+- bool merge_constant_pools(constantPoolHandle old_cp,
+- constantPoolHandle scratch_cp, constantPoolHandle *merge_cp_p,
+- int *merge_cp_length_p, TRAPS);
+- jvmtiError merge_cp_and_rewrite(instanceKlassHandle the_class,
+- instanceKlassHandle scratch_class, TRAPS);
+- u2 rewrite_cp_ref_in_annotation_data(
+- typeArrayHandle annotations_typeArray, int &byte_i_ref,
+- const char * trace_mesg, TRAPS);
+- bool rewrite_cp_refs(instanceKlassHandle scratch_class, TRAPS);
+- bool rewrite_cp_refs_in_annotation_struct(
+- typeArrayHandle class_annotations, int &byte_i_ref, TRAPS);
+- bool rewrite_cp_refs_in_annotations_typeArray(
+- typeArrayHandle annotations_typeArray, int &byte_i_ref, TRAPS);
+- bool rewrite_cp_refs_in_class_annotations(
+- instanceKlassHandle scratch_class, TRAPS);
+- bool rewrite_cp_refs_in_element_value(
+- typeArrayHandle class_annotations, int &byte_i_ref, TRAPS);
+- bool rewrite_cp_refs_in_fields_annotations(
+- instanceKlassHandle scratch_class, TRAPS);
+- void rewrite_cp_refs_in_method(methodHandle method,
+- methodHandle * new_method_p, TRAPS);
+- bool rewrite_cp_refs_in_methods(instanceKlassHandle scratch_class, TRAPS);
+- bool rewrite_cp_refs_in_methods_annotations(
+- instanceKlassHandle scratch_class, TRAPS);
+- bool rewrite_cp_refs_in_methods_default_annotations(
+- instanceKlassHandle scratch_class, TRAPS);
+- bool rewrite_cp_refs_in_methods_parameter_annotations(
+- instanceKlassHandle scratch_class, TRAPS);
+- void rewrite_cp_refs_in_stack_map_table(methodHandle method, TRAPS);
+- void rewrite_cp_refs_in_verification_type_info(
+- address& stackmap_addr_ref, address stackmap_end, u2 frame_i,
+- u1 frame_size, TRAPS);
+- void set_new_constant_pool(instanceKlassHandle scratch_class,
+- constantPoolHandle scratch_cp, int scratch_cp_length, TRAPS);
+
+ void flush_dependent_code(instanceKlassHandle k_h, TRAPS);
+
+- static void check_class(klassOop k_oop, oop initiating_loader, TRAPS);
+- static void dump_methods();
++ static void check_class(klassOop k_oop,/* oop initiating_loader,*/ TRAPS) PRODUCT_RETURN;
++
++ static void adjust_cpool_cache(klassOop k_oop, oop initiating_loader, TRAPS);
++
++#ifdef ASSERT
++ static void verify_classes(klassOop k_oop, oop initiating_loader, TRAPS);
++#endif
++
++ int calculate_redefinition_flags(instanceKlassHandle new_version);
++ void calculate_instance_update_information(klassOop new_version);
++ void check_methods_and_mark_as_obsolete(BitMap *emcp_methods, int * emcp_method_count_p);
++
++ static void calculate_type_check_information(klassOop k);
++ static void clear_type_check_information(klassOop k);
+
+ public:
+- VM_RedefineClasses(jint class_count,
+- const jvmtiClassDefinition *class_defs,
+- JvmtiClassLoadKind class_load_kind);
+- VMOp_Type type() const { return VMOp_RedefineClasses; }
++ VM_RedefineClasses(jint class_count, const jvmtiClassDefinition *class_defs, JvmtiClassLoadKind class_load_kind);
++ virtual ~VM_RedefineClasses();
++
++ bool check_arguments();
+ bool doit_prologue();
+ void doit();
+ void doit_epilogue();
++ void rollback();
+
+- bool allow_nested_vm_operations() const { return true; }
+- jvmtiError check_error() { return _res; }
++ jvmtiError check_exception() const;
++ VMOp_Type type() const { return VMOp_RedefineClasses; }
++ bool skip_operation() const { return false; }
++ bool allow_nested_vm_operations() const { return true; }
++ jvmtiError check_error() { return _result; }
++
++ void update_active_methods();
++
++ // Checks for type consistency after hierarchy change
++ bool check_type_consistency();
++ void calculate_type_check_information();
++ bool check_field_value_types();
++ void clear_type_check_information();
++ bool check_method_stacks();
++ bool check_loaded_methods();
++ bool check_method(methodOop method);
++ static Symbol* signature_to_class_name(Symbol* signature);
++
++ void method_forwarding();
++
++ void update_array_classes_to_newest_version(klassOop smallest_dimension);
+
+ // Modifiable test must be shared between IsModifiableClass query
+ // and redefine implementation
+ static bool is_modifiable_class(oop klass_mirror);
++
++ // Method used during garbage collection, the VM operation must iterate over all oops.
++ void oops_do(OopClosure* f);
++
++ // Utility methods for transferring field access flags
++
++ static void transfer_special_access_flags(fieldDescriptor *from, fieldDescriptor *to);
++ static void update_klass_field_access_flag(fieldDescriptor *fd);
++
++ void transfer_old_native_function_registrations(instanceKlassHandle the_class);
++
++ void lock_threads();
++ void unlock_threads();
++
++ template <class T> static void do_oop_work(T* p);
++
++ static void swap_marks(oop first, oop second);
++
+ };
+
+ #endif // SHARE_VM_PRIMS_JVMTIREDEFINECLASSES_HPP
+diff -r 882f6c762ac5 src/share/vm/prims/methodComparator.cpp
+--- a/src/share/vm/prims/methodComparator.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/prims/methodComparator.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -65,6 +65,7 @@
+ if (! args_same(c_old, c_new))
+ return false;
+ }
++
+ return true;
+ }
+
+diff -r 882f6c762ac5 src/share/vm/prims/nativeLookup.cpp
+--- a/src/share/vm/prims/nativeLookup.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/prims/nativeLookup.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -35,6 +35,7 @@
+ #include "oops/symbol.hpp"
+ #include "prims/jvm_misc.hpp"
+ #include "prims/nativeLookup.hpp"
++#include "prims/jvmtiRedefineClasses.hpp"
+ #include "runtime/arguments.hpp"
+ #include "runtime/handles.inline.hpp"
+ #include "runtime/javaCalls.hpp"
+@@ -53,7 +54,6 @@
+ # include "os_bsd.inline.hpp"
+ #endif
+
+-
+ static void mangle_name_on(outputStream* st, Symbol* name, int begin, int end) {
+ char* bytes = (char*)name->bytes() + begin;
+ char* end_bytes = (char*)name->bytes() + end;
+@@ -138,6 +138,40 @@
+ { CC"Java_sun_hotspot_WhiteBox_registerNatives", NULL, FN_PTR(JVM_RegisterWhiteBoxMethods) },
+ };
+
++// Helper function to call redefineClasses from Java Code
++JVM_ENTRY(int, JVM_RedefineClassesHelper(JNIEnv *env, jclass cb, jclass target, jbyteArray bytes))
++ ResourceMark rm(THREAD);
++
++ JavaThread* current_thread = JavaThread::current();
++ jbyte* bytecodes = NULL;
++ const int class_count = 1;
++ jvmtiClassDefinition* class_definitions = NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count);
++
++ {
++ ThreadToNativeFromVM ttnfv(thread);
++ jboolean is_copy = JNI_FALSE;
++ bytecodes = env->GetByteArrayElements(bytes, &is_copy);
++ class_definitions[0].klass = target;
++ class_definitions[0].class_byte_count = env->GetArrayLength(bytes);
++ class_definitions[0].class_bytes = (unsigned char*)bytecodes;
++ }
++
++ VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
++ VMThread::execute(&op);
++ int result = op.check_error();
++
++ {
++ ThreadToNativeFromVM ttnfv(thread);
++ if (env->ExceptionOccurred()) {
++ return -1;
++ }
++ env->ReleaseByteArrayElements(bytes, bytecodes, 0);
++ }
++
++ return result;
++JVM_END
++
++
+ static address lookup_special_native(char* jni_name) {
+ int i = !JDK_Version::is_gte_jdk14x_version() ? 0 : 2; // see comment in lookup_special_native_methods
+ int count = sizeof(lookup_special_native_methods) / sizeof(JNINativeMethod);
+@@ -177,6 +211,9 @@
+ return entry;
+ }
+ }
++ if(strstr(jni_name, "Java_at_ssw_hotswap_ClassRedefinition_redefineClasses") != NULL) {
++ return CAST_FROM_FN_PTR(address, JVM_RedefineClassesHelper);
++ }
+
+ // Otherwise call static method findNative in ClassLoader
+ KlassHandle klass (THREAD, SystemDictionary::ClassLoader_klass());
+diff -r 882f6c762ac5 src/share/vm/runtime/arguments.cpp
+--- a/src/share/vm/runtime/arguments.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/arguments.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -1874,6 +1874,15 @@
+ status = false;
+ }
+
++ // (tw) Must use serial GC
++ if (!UseSerialGC && i >= 1) {
++ jio_fprintf(defaultStream::error_stream(),
++ "Must use the serial GC in the Dynamic Code Evolution VM\n");
++ status = false;
++ } else {
++ UseSerialGC = true;
++ }
++
+ return status;
+ }
+
+diff -r 882f6c762ac5 src/share/vm/runtime/deoptimization.cpp
+--- a/src/share/vm/runtime/deoptimization.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/deoptimization.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -599,6 +599,38 @@
+ // Cleanup thread deopt data
+ cleanup_deopt_info(thread, array);
+
++ // (tw) Redefinition support: Check if we need to transfer method execution points to new versions
++ {
++ ResourceMark res_mark;
++
++ // Verify that the just-unpacked frames match the interpreter's
++ // notions of expression stack and locals
++ vframeArray* cur_array = thread->vframe_array_last();
++ RegisterMap rm(thread, false);
++ rm.set_include_argument_oops(false);
++ for (int i = 0; i < cur_array->frames(); i++) {
++ vframeArrayElement* el = cur_array->element(i);
++ frame* frame = el->iframe();
++ guarantee(frame->is_interpreted_frame(), "Wrong frame type");
++ RegisterMap reg_map(thread);
++ vframe* vf = vframe::new_vframe(frame, ®_map, thread);
++ interpretedVFrame *iframe = (interpretedVFrame *)vf;
++ methodOop method = iframe->method();
++ int bci = iframe->bci();
++ method = method->newest_version();
++ iframe->set_method(method, bci);
++
++ methodOop forward_method = method->forward_method();
++ if (forward_method != NULL && method->is_in_code_section(bci)) {
++ int new_bci = method->calculate_forward_bci(bci, forward_method);
++ if (TraceRedefineClasses >= 2) {
++ tty->print_cr("Transferring execution of %s to new method old_bci=%d new_bci=%d", forward_method->name()->as_C_string(), bci, new_bci);
++ }
++ iframe->set_method(forward_method, new_bci);
++ }
++ }
++ }
++
+ #ifndef PRODUCT
+ if (VerifyStack) {
+ ResourceMark res_mark;
+diff -r 882f6c762ac5 src/share/vm/runtime/frame.cpp
+--- a/src/share/vm/runtime/frame.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/frame.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -408,6 +408,12 @@
+ *interpreter_frame_method_addr() = method;
+ }
+
++// (tw) Sets constant pool cache oop
++void frame::interpreter_frame_set_cache(constantPoolCacheOop cp) {
++ assert(is_interpreted_frame(), "interpreted frame expected");
++ *interpreter_frame_cache_addr() = cp;
++}
++
+ void frame::interpreter_frame_set_bcx(intptr_t bcx) {
+ assert(is_interpreted_frame(), "Not an interpreted frame");
+ if (ProfileInterpreter) {
+@@ -423,19 +429,27 @@
+ // The bcx was just converted from bci to bcp.
+ // Convert the mdx in parallel.
+ methodDataOop mdo = interpreter_frame_method()->method_data();
+- assert(mdo != NULL, "");
+- int mdi = mdx - 1; // We distinguish valid mdi from zero by adding one.
+- address mdp = mdo->di_to_dp(mdi);
+- interpreter_frame_set_mdx((intptr_t)mdp);
++ if (mdo == NULL) {
++ interpreter_frame_set_mdx(0);
++ } else {
++ assert(mdo != NULL, "");
++ int mdi = mdx - 1; // We distinguish valid mdi from zero by adding one.
++ address mdp = mdo->di_to_dp(mdi);
++ interpreter_frame_set_mdx((intptr_t)mdp);
++ }
+ }
+ } else {
+ if (is_now_bci) {
+ // The bcx was just converted from bcp to bci.
+ // Convert the mdx in parallel.
+ methodDataOop mdo = interpreter_frame_method()->method_data();
+- assert(mdo != NULL, "");
+- int mdi = mdo->dp_to_di((address)mdx);
+- interpreter_frame_set_mdx((intptr_t)mdi + 1); // distinguish valid from 0.
++ if (mdo == NULL) {
++ interpreter_frame_set_mdx(0);
++ } else {
++ assert(mdo != NULL, "");
++ int mdi = mdo->dp_to_di((address)mdx);
++ interpreter_frame_set_mdx((intptr_t)mdi + 1); // distinguish valid from 0.
++ }
+ }
+ }
+ }
+diff -r 882f6c762ac5 src/share/vm/runtime/frame.hpp
+--- a/src/share/vm/runtime/frame.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/frame.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -346,6 +346,7 @@
+ // Method & constant pool cache
+ methodOop interpreter_frame_method() const;
+ void interpreter_frame_set_method(methodOop method);
++ void interpreter_frame_set_cache(constantPoolCacheOop method);
+ methodOop* interpreter_frame_method_addr() const;
+ constantPoolCacheOop* interpreter_frame_cache_addr() const;
+ #ifdef PPC
+diff -r 882f6c762ac5 src/share/vm/runtime/globals.hpp
+--- a/src/share/vm/runtime/globals.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/globals.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -1229,9 +1229,23 @@
+ product(bool, StressLdcRewrite, false, \
+ "Force ldc -> ldc_w rewrite during RedefineClasses") \
+ \
++ product(bool, UseMethodForwardPoints, false, \
++ "Use method forward points") \
++ \
++ product(intx, MethodForwardPointsMaxLocals, 300, \
++ "Maximum number of locals in forwarding method") \
++ \
++ product(intx, MethodForwardPointsMaxStack, 300, \
++ "Maximum number of stack slots in forwarding method") \
++ \
+ product(intx, TraceRedefineClasses, 0, \
+ "Trace level for JVMTI RedefineClasses") \
+ \
++ product(bool, TimeRedefineClasses, false, \
++ "Measure timing for JVMTI RedefineClasses") \
++ \
++ product(bool, AllowAdvancedClassRedefinition, true, \
++ "Allow advanced class redefinition beyond swapping method bodies")\
+ develop(bool, StressMethodComparator, false, \
+ "run the MethodComparator on all loaded methods") \
+ \
+diff -r 882f6c762ac5 src/share/vm/runtime/interfaceSupport.hpp
+--- a/src/share/vm/runtime/interfaceSupport.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/interfaceSupport.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -296,7 +296,7 @@
+ ThreadToNativeFromVM(JavaThread *thread) : ThreadStateTransition(thread) {
+ // We are leaving the VM at this point and going directly to native code.
+ // Block, if we are in the middle of a safepoint synchronization.
+- assert(!thread->owns_locks(), "must release all locks when leaving VM");
++ assert(!thread->owns_locks_but_redefine_classes_lock(), "must release all locks when leaving VM");
+ thread->frame_anchor()->make_walkable(thread);
+ trans_and_fence(_thread_in_vm, _thread_in_native);
+ // Check for pending. async. exceptions or suspends.
+diff -r 882f6c762ac5 src/share/vm/runtime/javaCalls.cpp
+--- a/src/share/vm/runtime/javaCalls.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/javaCalls.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -60,7 +60,7 @@
+ bool clear_pending_exception = true;
+
+ guarantee(thread->is_Java_thread(), "crucial check - the VM thread cannot and must not escape to Java code");
+- assert(!thread->owns_locks(), "must release all locks when leaving VM");
++ assert(!thread->owns_locks_but_redefine_classes_lock(), "must release all locks when leaving VM");
+ guarantee(!thread->is_Compiler_thread(), "cannot make java calls from the compiler");
+ _result = result;
+
+diff -r 882f6c762ac5 src/share/vm/runtime/jniHandles.cpp
+--- a/src/share/vm/runtime/jniHandles.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/jniHandles.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -112,6 +112,10 @@
+ }
+
+ jmethodID JNIHandles::make_jmethod_id(methodHandle mh) {
++ if (mh->newest_version() != mh()) {
++ methodHandle mh_new(Thread::current(), mh()->newest_version());
++ return (jmethodID) make_weak_global(mh_new);
++ }
+ return (jmethodID) make_weak_global(mh);
+ }
+
+diff -r 882f6c762ac5 src/share/vm/runtime/mutex.cpp
+--- a/src/share/vm/runtime/mutex.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/mutex.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -1227,7 +1227,7 @@
+ // in increasing rank order (modulo any native ranks)
+ for (tmp = locks; tmp != NULL; tmp = tmp->next()) {
+ if (tmp->next() != NULL) {
+- assert(tmp->rank() == Mutex::native ||
++ assert(tmp->rank() == Mutex::native || tmp->rank() == Mutex::redefine_classes ||
+ tmp->rank() <= tmp->next()->rank(), "mutex rank anomaly?");
+ }
+ }
+@@ -1247,7 +1247,7 @@
+ // in increasing rank order (modulo any native ranks)
+ for (tmp = locks; tmp != NULL; tmp = tmp->next()) {
+ if (tmp->next() != NULL) {
+- assert(tmp->rank() == Mutex::native ||
++ assert(tmp->rank() == Mutex::native || tmp->rank() == Mutex::redefine_classes ||
+ tmp->rank() <= tmp->next()->rank(), "mutex rank anomaly?");
+ }
+ }
+@@ -1310,6 +1310,7 @@
+ // already hold Terminator_lock - may happen because of periodic safepoints
+ if (this->rank() != Mutex::native &&
+ this->rank() != Mutex::suspend_resume &&
++ this->rank() != Mutex::redefine_classes &&
+ locks != NULL && locks->rank() <= this->rank() &&
+ !SafepointSynchronize::is_at_safepoint() &&
+ this != Interrupt_lock &&
+diff -r 882f6c762ac5 src/share/vm/runtime/mutex.hpp
+--- a/src/share/vm/runtime/mutex.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/mutex.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -109,7 +109,8 @@
+ barrier = safepoint + 1,
+ nonleaf = barrier + 1,
+ max_nonleaf = nonleaf + 900,
+- native = max_nonleaf + 1
++ native = max_nonleaf + 1,
++ redefine_classes = native + 1
+ };
+
+ // The WaitSet and EntryList linked lists are composed of ParkEvents.
+diff -r 882f6c762ac5 src/share/vm/runtime/mutexLocker.cpp
+--- a/src/share/vm/runtime/mutexLocker.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/mutexLocker.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -49,6 +49,7 @@
+ // Consider using GCC's __read_mostly.
+
+ Mutex* Patching_lock = NULL;
++Mutex* RedefineClasses_lock = NULL;
+ Monitor* SystemDictionary_lock = NULL;
+ Mutex* PackageTable_lock = NULL;
+ Mutex* CompiledIC_lock = NULL;
+@@ -91,6 +92,7 @@
+ Mutex* DirtyCardQ_FL_lock = NULL;
+ Monitor* DirtyCardQ_CBL_mon = NULL;
+ Mutex* Shared_DirtyCardQ_lock = NULL;
++Monitor* RedefinitionSync_lock = NULL;
+ Mutex* ParGCRareEvent_lock = NULL;
+ Mutex* EvacFailureStack_lock = NULL;
+ Mutex* DerivedPointerTableGC_lock = NULL;
+@@ -208,6 +210,7 @@
+ def(HotCardCache_lock , Mutex , special , true );
+ def(EvacFailureStack_lock , Mutex , nonleaf , true );
+ }
++ def(RedefinitionSync_lock , Monitor , leaf , false );
+ def(ParGCRareEvent_lock , Mutex , leaf , true );
+ def(DerivedPointerTableGC_lock , Mutex, leaf, true );
+ def(CodeCache_lock , Mutex , special, true );
+@@ -283,6 +286,7 @@
+ def(Debug3_lock , Mutex , nonleaf+4, true );
+ def(CompileThread_lock , Monitor, nonleaf+5, false);
+ def(PeriodicTask_lock , Monitor, nonleaf+5, true);
++ def(RedefineClasses_lock , Mutex , nonleaf+7, false ); // for ensuring that class redefinition is not done in parallel
+
+ #ifdef INCLUDE_TRACE
+ def(JfrMsg_lock , Monitor, leaf, true);
+diff -r 882f6c762ac5 src/share/vm/runtime/mutexLocker.hpp
+--- a/src/share/vm/runtime/mutexLocker.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/mutexLocker.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -43,6 +43,8 @@
+ // Mutexes used in the VM.
+
+ extern Mutex* Patching_lock; // a lock used to guard code patching of compiled code
++extern Monitor* RedefinitionSync_lock; // a lock on synchronized class redefinition
++extern Mutex* RedefineClasses_lock; // a lock on class redefinition
+ extern Monitor* SystemDictionary_lock; // a lock on the system dictonary
+ extern Mutex* PackageTable_lock; // a lock on the class loader package table
+ extern Mutex* CompiledIC_lock; // a lock used to guard compiled IC patching and access
+diff -r 882f6c762ac5 src/share/vm/runtime/reflection.cpp
+--- a/src/share/vm/runtime/reflection.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/reflection.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -468,7 +468,8 @@
+ // sun/reflect/MagicAccessorImpl subclasses to succeed trivially.
+ if ( JDK_Version::is_gte_jdk14x_version()
+ && UseNewReflection
+- && Klass::cast(current_class)->is_subclass_of(SystemDictionary::reflect_MagicAccessorImpl_klass())) {
++ && (Klass::cast(current_class)->is_subclass_of(SystemDictionary::reflect_MagicAccessorImpl_klass()) ||
++ Klass::cast(current_class)->is_subclass_of(SystemDictionary::reflect_MagicAccessorImpl_klass()->klass_part()->newest_version()))) {
+ return true;
+ }
+
+@@ -519,6 +520,12 @@
+ AccessFlags access,
+ bool classloader_only,
+ bool protected_restriction) {
++
++ // (tw) Decide accessibility based on active version
++ if (current_class != NULL) {
++ current_class = current_class->klass_part()->active_version();
++ }
++
+ // Verify that current_class can access a field of field_class, where that
+ // field's access bits are "access". We assume that we've already verified
+ // that current_class can access field_class.
+@@ -560,7 +567,8 @@
+ // sun/reflect/MagicAccessorImpl subclasses to succeed trivially.
+ if ( JDK_Version::is_gte_jdk14x_version()
+ && UseNewReflection
+- && Klass::cast(current_class)->is_subclass_of(SystemDictionary::reflect_MagicAccessorImpl_klass())) {
++ && (Klass::cast(current_class)->is_subclass_of(SystemDictionary::reflect_MagicAccessorImpl_klass()) ||
++ Klass::cast(current_class)->is_subclass_of(SystemDictionary::reflect_MagicAccessorImpl_klass()->klass_part()->newest_version()))) {
+ return true;
+ }
+
+diff -r 882f6c762ac5 src/share/vm/runtime/sharedRuntime.cpp
+--- a/src/share/vm/runtime/sharedRuntime.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/sharedRuntime.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -1137,7 +1137,20 @@
+ if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
+ int retry_count = 0;
+ while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
+- callee_method->method_holder() != SystemDictionary::Object_klass()) {
++ callee_method->method_holder()->klass_part()->newest_version() != SystemDictionary::Object_klass()->klass_part()->newest_version()) {
++
++ // DCEVM: If we are executing an old method, this is OK!
++ {
++ ResourceMark rm(thread);
++ RegisterMap cbl_map(thread, false);
++ frame caller_frame = thread->last_frame().sender(&cbl_map);
++
++ CodeBlob* caller_cb = caller_frame.cb();
++ guarantee(caller_cb != NULL && caller_cb->is_nmethod(), "must be called from nmethod");
++ nmethod* caller_nm = caller_cb->as_nmethod_or_null();
++ if (caller_nm->method()->is_old()) break;
++ }
++
+ // If has a pending exception then there is no need to re-try to
+ // resolve this method.
+ // If the method has been redefined, we need to try again.
+diff -r 882f6c762ac5 src/share/vm/runtime/thread.cpp
+--- a/src/share/vm/runtime/thread.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/thread.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -216,6 +216,8 @@
+ set_self_raw_id(0);
+ set_lgrp_id(-1);
+
++ _redefine_classes_mutex = new Mutex(Mutex::redefine_classes, "redefine classes lock", false);
++
+ // allocated data structures
+ set_osthread(NULL);
+ set_resource_area(new (mtThread)ResourceArea());
+@@ -249,6 +251,7 @@
+ omFreeProvision = 32 ;
+ omInUseList = NULL ;
+ omInUseCount = 0 ;
++ _pretend_new_universe = false;
+
+ #ifdef ASSERT
+ _visited_for_critical_count = false;
+@@ -884,6 +887,15 @@
+ return false;
+ }
+
++bool Thread::owns_locks_but_redefine_classes_lock() const {
++ for(Monitor *cur = _owned_locks; cur; cur = cur->next()) {
++ if (cur != RedefineClasses_lock && cur->rank() != Mutex::redefine_classes) {
++ return true;
++ }
++ }
++ return false;
++}
++
+
+ #endif
+
+@@ -1637,7 +1649,7 @@
+ ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm);
+
+ assert(JavaThread::current() == this, "sanity check");
+- assert(!Thread::current()->owns_locks(), "sanity check");
++ assert(!Thread::current()->owns_locks_but_redefine_classes_lock(), "sanity check");
+
+ DTRACE_THREAD_PROBE(start, this);
+
+@@ -3193,7 +3205,7 @@
+
+ // Create a CompilerThread
+ CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters)
+-: JavaThread(&compiler_thread_entry) {
++: JavaThread(&compiler_thread_entry), _should_bailout(false) {
+ _env = NULL;
+ _log = NULL;
+ _task = NULL;
+@@ -3201,6 +3213,7 @@
+ _counters = counters;
+ _buffer_blob = NULL;
+ _scanned_nmethod = NULL;
++ _compilation_mutex = new Mutex(Mutex::redefine_classes, "compilationMutex", false);
+
+ #ifndef PRODUCT
+ _ideal_graph_printer = NULL;
+@@ -3230,6 +3243,7 @@
+ int Threads::_number_of_non_daemon_threads = 0;
+ int Threads::_return_code = 0;
+ size_t JavaThread::_stack_size_at_create = 0;
++bool Threads::_wait_at_instrumentation_entry = false;
+
+ // All JavaThreads
+ #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next())
+diff -r 882f6c762ac5 src/share/vm/runtime/thread.hpp
+--- a/src/share/vm/runtime/thread.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/thread.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -203,11 +203,14 @@
+ void enter_signal_handler() { _num_nested_signal++; }
+ void leave_signal_handler() { _num_nested_signal--; }
+ bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
++ Mutex* redefine_classes_mutex() { return _redefine_classes_mutex; }
+
+ private:
+ // Debug tracing
+ static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
+
++ Mutex* _redefine_classes_mutex;
++
+ // Active_handles points to a block of handles
+ JNIHandleBlock* _active_handles;
+
+@@ -530,10 +533,15 @@
+ uintptr_t _self_raw_id; // used by get_thread (mutable)
+ int _lgrp_id;
+
++
++ bool _pretend_new_universe;
++
+ public:
+ // Stack overflow support
+ address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
+
++ void set_pretend_new_universe(bool b) { if (_pretend_new_universe != b) { if (TraceRedefineClasses >= 5) tty->print_cr("Changing pretend universe to %d", (int)b); _pretend_new_universe = b; } }
++ bool pretend_new_universe() { return _pretend_new_universe; }
+ void set_stack_base(address base) { _stack_base = base; }
+ size_t stack_size() const { return _stack_size; }
+ void set_stack_size(size_t size) { _stack_size = size; }
+@@ -570,6 +578,7 @@
+ void print_owned_locks() const { print_owned_locks_on(tty); }
+ Monitor* owned_locks() const { return _owned_locks; }
+ bool owns_locks() const { return owned_locks() != NULL; }
++ bool owns_locks_but_redefine_classes_lock() const;
+ bool owns_locks_but_compiled_lock() const;
+
+ // Deadlock detection
+@@ -1793,6 +1802,8 @@
+ CompileTask* _task;
+ CompileQueue* _queue;
+ BufferBlob* _buffer_blob;
++ bool _should_bailout;
++ Mutex* _compilation_mutex;
+
+ nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper
+
+@@ -1802,12 +1813,16 @@
+
+ CompilerThread(CompileQueue* queue, CompilerCounters* counters);
+
++ bool should_bailout() const { return _should_bailout; }
++ void set_should_bailout(bool b) { _should_bailout = false; }
++
+ bool is_Compiler_thread() const { return true; }
+ // Hide this compiler thread from external view.
+ bool is_hidden_from_external_view() const { return true; }
+
+ CompileQueue* queue() { return _queue; }
+ CompilerCounters* counters() { return _counters; }
++ Mutex *compilation_mutex() { return _compilation_mutex; }
+
+ // Get/set the thread's compilation environment.
+ ciEnv* env() { return _env; }
+@@ -1862,6 +1877,7 @@
+ static int _number_of_threads;
+ static int _number_of_non_daemon_threads;
+ static int _return_code;
++ static bool _wait_at_instrumentation_entry;
+
+ public:
+ // Thread management
+@@ -1873,6 +1889,9 @@
+ static JavaThread* first() { return _thread_list; }
+ static void threads_do(ThreadClosure* tc);
+
++ static bool wait_at_instrumentation_entry() { return _wait_at_instrumentation_entry; }
++ static void set_wait_at_instrumentation_entry(bool b) { _wait_at_instrumentation_entry = b; }
++
+ // Initializes the vm and creates the vm thread
+ static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
+ static void convert_vm_init_libraries_to_agents();
+diff -r 882f6c762ac5 src/share/vm/runtime/vframe.cpp
+--- a/src/share/vm/runtime/vframe.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/vframe.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -253,6 +253,46 @@
+ return fr().interpreter_frame_method();
+ }
+
++// (tw) Sets interpreter frame method.
++void interpretedVFrame::set_method(methodOop new_method, int new_bci) {
++ methodOop old_method = fr().interpreter_frame_method();
++ int old_stack_size = fr().interpreter_frame_expression_stack_size();
++ if (old_method == new_method) return;
++ u_char *old_bcp = bcp();
++ int old_bci = bci();
++ fr().interpreter_frame_set_method(new_method);
++ fr().interpreter_frame_set_cache(new_method->constants()->cache());
++ u_char *new_bcp = new_method->code_base() + new_bci;
++ assert(new_method->bcp_from(new_bci) == new_bcp, "");
++
++ set_bcp(new_bcp);
++
++ Bytecodes::Code code = Bytecodes::java_code_at(old_method, old_bcp);
++ assert(Bytecodes::java_code_at(new_method, new_bcp) == code, "must have same bytecode at this position");
++
++ switch (code) {
++ case Bytecodes::_invokevirtual :
++ case Bytecodes::_invokespecial :
++ case Bytecodes::_invokestatic :
++ case Bytecodes::_invokeinterface: {
++ int old_index = Bytes::get_native_u2(old_bcp+1);
++ int new_index = Bytes::get_native_u2(new_bcp+1);
++ new_method->constants()->cache()->entry_at(new_index)->copy_from(old_method->constants()->cache()->entry_at(old_index));
++ break;
++ }
++
++ case Bytecodes::_invokedynamic: {
++ int old_index = Bytes::get_native_u4(old_bcp+1);
++ int new_index = Bytes::get_native_u4(new_bcp+1);
++ new_method->constants()->cache()->secondary_entry_at(new_index)->copy_from(old_method->constants()->cache()->secondary_entry_at(old_index));
++ break;
++ }
++ }
++
++ int new_stack_size = fr().interpreter_frame_expression_stack_size();
++ assert(new_method->validate_bci_from_bcx((intptr_t)new_bcp) == new_bci, "");
++}
++
+ StackValueCollection* interpretedVFrame::locals() const {
+ int length = method()->max_locals();
+
+diff -r 882f6c762ac5 src/share/vm/runtime/vframe.hpp
+--- a/src/share/vm/runtime/vframe.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/vframe.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -163,6 +163,7 @@
+ StackValueCollection* locals() const;
+ StackValueCollection* expressions() const;
+ GrowableArray<MonitorInfo*>* monitors() const;
++ void set_method(methodOop method, int new_bci);
+
+ void set_locals(StackValueCollection* values) const;
+
+diff -r 882f6c762ac5 src/share/vm/runtime/vmThread.cpp
+--- a/src/share/vm/runtime/vmThread.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/runtime/vmThread.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -694,6 +694,10 @@
+ void VMThread::oops_do(OopClosure* f, CodeBlobClosure* cf) {
+ Thread::oops_do(f, cf);
+ _vm_queue->oops_do(f);
++ // (DCEVM) need to update oops in VM_RedefineClasses!
++ if (_cur_vm_operation != NULL) {
++ _cur_vm_operation->oops_do(f);
++ }
+ }
+
+ //------------------------------------------------------------------------------------------------------------------
+diff -r 882f6c762ac5 src/share/vm/utilities/exceptions.cpp
+--- a/src/share/vm/utilities/exceptions.cpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/utilities/exceptions.cpp Thu Jul 09 23:18:17 2015 -0700
+@@ -254,6 +254,8 @@
+ assert(thread->is_Java_thread(), "can only be called by a Java thread");
+ assert(!thread->has_pending_exception(), "already has exception");
+
++ bool old_pretend_value = Thread::current()->pretend_new_universe();
++ Thread::current()->set_pretend_new_universe(false);
+ Handle h_exception;
+
+ // Resolve exception klass
+@@ -285,6 +287,7 @@
+ h_exception = Handle(thread, thread->pending_exception());
+ thread->clear_pending_exception();
+ }
++ Thread::current()->set_pretend_new_universe(old_pretend_value);
+ return h_exception;
+ }
+
+@@ -295,6 +298,8 @@
+ Symbol* signature, JavaCallArguments *args,
+ Handle h_cause,
+ Handle h_loader, Handle h_protection_domain) {
++ bool old_pretend_value = Thread::current()->pretend_new_universe();
++ Thread::current()->set_pretend_new_universe(false);
+ Handle h_exception = new_exception(thread, name, signature, args, h_loader, h_protection_domain);
+
+ // Future: object initializer should take a cause argument
+@@ -317,6 +322,8 @@
+ h_exception = Handle(thread, thread->pending_exception());
+ thread->clear_pending_exception();
+ }
++
++ Thread::current()->set_pretend_new_universe(old_pretend_value);
+ return h_exception;
+ }
+
+diff -r 882f6c762ac5 src/share/vm/utilities/growableArray.hpp
+--- a/src/share/vm/utilities/growableArray.hpp Thu Jul 09 23:10:04 2015 -0700
++++ b/src/share/vm/utilities/growableArray.hpp Thu Jul 09 23:18:17 2015 -0700
+@@ -145,6 +145,33 @@
+ assert(on_stack(), "fast ResourceObj path only");
+ return (void*)resource_allocate_bytes(thread, elementSize * _max);
+ }
++
++};
++
++template<class E, class F> class Pair : public StackObj
++{
++private:
++ E _left;
++ F _right;
++
++public:
++
++ Pair() {
++
++ }
++
++ Pair(E left, F right) {
++ this->_left = left;
++ this->_right = right;
++ }
++
++ E left() {
++ return _left;
++ }
++
++ F right() {
++ return _right;
++ }
+ };
+
+ template<class E> class GrowableArray : public GenericGrowableArray {
light-jdk7u60-deopt-cp.patch #+light-jdk7u60-b09 #+light-jdk7u71-b01 #+light-jdk7u79-b02
full-jdk7u60-b09.patch #+full-jdk7u60-b09
full-jdk7u71-b01.patch #+full-jdk7u71-b01
-full-jdk7u79-b02.patch #+full-jdk7u79-b02
-full-jdk7u60-deopt-cp.patch #+full-jdk7u60-b09 #+full-jdk7u71-b01 #+full-jdk7u79-b02
+full-jdk7u79-b15.patch #+full-jdk7u79-b15
+full-jdk7u60-deopt-cp.patch #+full-jdk7u60-b09 #+full-jdk7u71-b01 #+full-jdk7u79-b15
+full-jdk7u79-b15-method-handles.patch #+full-jdk7u79-b15
light-jdk8u5-b13.patch #+light-jdk8u5-b13
projects / dcevm.git / commitdiff