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- package org.aspectj.apache.bcel.generic;
-
- /* ====================================================================
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2001 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Apache" and "Apache Software Foundation" and
- * "Apache BCEL" must not be used to endorse or promote products
- * derived from this software without prior written permission. For
- * written permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * "Apache BCEL", nor may "Apache" appear in their name, without
- * prior written permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
-
- import java.util.ArrayList;
- import java.util.Hashtable;
- import java.util.Iterator;
- import java.util.List;
- import java.util.Stack;
-
- import org.aspectj.apache.bcel.Constants;
- import org.aspectj.apache.bcel.classfile.Attribute;
- import org.aspectj.apache.bcel.classfile.Code;
- import org.aspectj.apache.bcel.classfile.CodeException;
- import org.aspectj.apache.bcel.classfile.ConstantPool;
- import org.aspectj.apache.bcel.classfile.ExceptionTable;
- import org.aspectj.apache.bcel.classfile.LineNumber;
- import org.aspectj.apache.bcel.classfile.LineNumberTable;
- import org.aspectj.apache.bcel.classfile.LocalVariable;
- import org.aspectj.apache.bcel.classfile.LocalVariableTable;
- import org.aspectj.apache.bcel.classfile.Method;
- import org.aspectj.apache.bcel.classfile.Utility;
- import org.aspectj.apache.bcel.classfile.annotation.AnnotationGen;
- import org.aspectj.apache.bcel.classfile.annotation.RuntimeAnnos;
- import org.aspectj.apache.bcel.classfile.annotation.RuntimeParamAnnos;
-
- /**
- * Template class for building up a method. This is done by defining exception handlers, adding thrown exceptions, local variables
- * and attributes, whereas the 'LocalVariableTable' and 'LineNumberTable' attributes will be set automatically for the code. Use
- * stripAttributes() if you don't like this.
- *
- * While generating code it may be necessary to insert NOP operations. You can use the `removeNOPs' method to get rid off them. The
- * resulting method object can be obtained via the `getMethod()' method.
- *
- * @version $Id: MethodGen.java,v 1.17 2011/05/19 23:23:46 aclement Exp $
- * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
- * @author <A HREF="http://www.vmeng.com/beard">Patrick C. Beard</A> [setMaxStack()]
- * @see InstructionList
- * @see Method
- */
- public class MethodGen extends FieldGenOrMethodGen {
- private String classname;
- private Type[] parameterTypes;
- private String[] parameterNames;
- private int maxLocals;
- private int maxStack;
- private InstructionList il;
-
- // Indicates whether to produce code attributes for LineNumberTable and LocalVariableTable, like javac -O
- private boolean stripAttributes;
-
- private int highestLineNumber = 0;
-
- private ArrayList<LocalVariableGen> localVariablesList = new ArrayList<LocalVariableGen>();
- private ArrayList<LineNumberGen> lineNumbersList = new ArrayList<LineNumberGen>();
- private ArrayList<CodeExceptionGen> exceptionsList = new ArrayList<CodeExceptionGen>();
- private ArrayList<String> exceptionsThrown = new ArrayList<String>();
- private ArrayList<Attribute> codeAttributesList = new ArrayList<Attribute>();
- private List<AnnotationGen>[] param_annotations; // Array of lists containing AnnotationGen objects
- private boolean hasParameterAnnotations = false;
- private boolean haveUnpackedParameterAnnotations = false;
-
- /**
- * Declare method. If the method is non-static the constructor automatically declares a local variable `$this' in slot 0. The
- * actual code is contained in the `il' parameter, which may further manipulated by the user. But he must take care not to
- * remove any instruction (handles) that are still referenced from this object.
- *
- * For example one may not add a local variable and later remove the instructions it refers to without causing havoc. It is safe
- * however if you remove that local variable, too.
- *
- * @param access_flags access qualifiers
- * @param return_type method type
- * @param arg_types argument types
- * @param arg_names argument names (if this is null, default names will be provided for them)
- * @param method_name name of method
- * @param class_name class name containing this method (may be null, if you don't care)
- * @param il instruction list associated with this method, may be null only for abstract or native methods
- * @param cp constant pool
- */
- public MethodGen(int access_flags, Type return_type, Type[] arg_types, String[] arg_names, String method_name,
- String class_name, InstructionList il, ConstantPool cp) {
-
- this.modifiers = access_flags;
- this.type = return_type;
- this.parameterTypes = arg_types;
- this.parameterNames = arg_names;
- this.name = method_name;
- this.classname = class_name;
- this.il = il;
- this.cp = cp;
-
- // OPTIMIZE this code messes with the local variables - do we need it?
- // boolean abstract_ = isAbstract() || isNative();
- // InstructionHandle start = null;
- // InstructionHandle end = null;
- //
- // if (!abstract_) {
- // start = il.getStart();
- // end = il.getEnd();
- //
- // /* Add local variables, namely the implicit `this' and the arguments
- // */
- // // if(!isStatic() && (class_name != null)) { // Instance method -> `this' is local var 0
- // // addLocalVariable("this", new ObjectType(class_name), start, end);
- // // }
- // }
-
- // if(arg_types != null) {
- // int size = arg_types.length;
- //
- // for(int i=0; i < size; i++) {
- // if(Type.VOID == arg_types[i]) {
- // throw new ClassGenException("'void' is an illegal argument type for a method");
- // }
- // }
- //
- // if(arg_names != null) { // Names for variables provided?
- // if(size != arg_names.length)
- // throw new ClassGenException("Mismatch in argument array lengths: " +
- // size + " vs. " + arg_names.length);
- // } else { // Give them dummy names
- // // arg_names = new String[size];
- // //
- // // for(int i=0; i < size; i++)
- // // arg_names[i] = "arg" + i;
- // //
- // // setArgumentNames(arg_names);
- // }
-
- // if(!abstract_) {
- // for(int i=0; i < size; i++) {
- // // addLocalVariable(arg_names[i], arg_types[i], start, end);
- // }
- // }
- // }
- }
-
- public int getHighestlinenumber() {
- return highestLineNumber;
- }
-
- /**
- * Instantiate from existing method.
- *
- * @param m method
- * @param class_name class name containing this method
- * @param cp constant pool
- */
-
- public MethodGen(Method m, String class_name, ConstantPool cp) {
- this(m, class_name, cp, false);
- }
-
- // OPTIMIZE should always use tags and never anything else!
- public MethodGen(Method m, String class_name, ConstantPool cp, boolean useTags) {
- this(m.getModifiers(),
- // OPTIMIZE implementation of getReturnType() and getArgumentTypes() on Method seems weak
- m.getReturnType(), m.getArgumentTypes(), null /* may be overridden anyway */, m.getName(), class_name, ((m
- .getModifiers() & (Constants.ACC_ABSTRACT | Constants.ACC_NATIVE)) == 0) ? new InstructionList(m.getCode()
- .getCode()) : null, cp);
-
- Attribute[] attributes = m.getAttributes();
- for (Attribute attribute : attributes) {
- Attribute a = attribute;
-
- if (a instanceof Code) {
- Code code = (Code) a;
- setMaxStack(code.getMaxStack());
- setMaxLocals(code.getMaxLocals());
-
- CodeException[] ces = code.getExceptionTable();
-
- InstructionHandle[] arrayOfInstructions = il.getInstructionsAsArray();
-
- // process the exception table
- // -
- if (ces != null) {
- for (CodeException ce : ces) {
- int type = ce.getCatchType();
- ObjectType catchType = null;
-
- if (type > 0) {
- String cen = m.getConstantPool().getConstantString_CONSTANTClass(type);
- catchType = new ObjectType(cen);
- }
-
- int end_pc = ce.getEndPC();
- int length = m.getCode().getCode().length;
-
- InstructionHandle end;
-
- if (length == end_pc) { // May happen, because end_pc is exclusive
- end = il.getEnd();
- } else {
- end = il.findHandle(end_pc, arrayOfInstructions);// il.findHandle(end_pc);
- end = end.getPrev(); // Make it inclusive
- }
-
- addExceptionHandler(il.findHandle(ce.getStartPC(), arrayOfInstructions), end, il.findHandle(ce
- .getHandlerPC(), arrayOfInstructions), catchType);
- }
- }
-
- Attribute[] codeAttrs = code.getAttributes();
- for (Attribute codeAttr : codeAttrs) {
- a = codeAttr;
-
- if (a instanceof LineNumberTable) {
- LineNumber[] ln = ((LineNumberTable) a).getLineNumberTable();
- if (useTags) {
- // abracadabra, lets create tags rather than linenumbergens.
- for (LineNumber l : ln) {
- int lnum = l.getLineNumber();
- if (lnum > highestLineNumber) {
- highestLineNumber = lnum;
- }
- LineNumberTag lt = new LineNumberTag(lnum);
- il.findHandle(l.getStartPC(), arrayOfInstructions, true).addTargeter(lt);
- }
- } else {
- for (LineNumber l : ln) {
- addLineNumber(il.findHandle(l.getStartPC(), arrayOfInstructions, true), l.getLineNumber());
- }
- }
- } else if (a instanceof LocalVariableTable) {
-
- // Lets have a go at creating Tags directly
- if (useTags) {
- LocalVariable[] lv = ((LocalVariableTable) a).getLocalVariableTable();
-
- for (LocalVariable l : lv) {
- Type t = Type.getType(l.getSignature());
- LocalVariableTag lvt = new LocalVariableTag(t, l.getSignature(), l.getName(), l.getIndex(), l
- .getStartPC());
- InstructionHandle start = il.findHandle(l.getStartPC(), arrayOfInstructions, true);
- byte b = t.getType();
- if (b != Constants.T_ADDRESS) {
- int increment = t.getSize();
- if (l.getIndex() + increment > maxLocals) {
- maxLocals = l.getIndex() + increment;
- }
- }
- int end = l.getStartPC() + l.getLength();
- do {
- start.addTargeter(lvt);
- start = start.getNext();
- } while (start != null && start.getPosition() < end);
- }
- } else {
-
- LocalVariable[] lv = ((LocalVariableTable) a).getLocalVariableTable();
-
- removeLocalVariables();
-
- for (LocalVariable l : lv) {
- InstructionHandle start = il.findHandle(l.getStartPC(), arrayOfInstructions);
- InstructionHandle end = il.findHandle(l.getStartPC() + l.getLength(), arrayOfInstructions);
- // AMC, this actually gives us the first instruction AFTER the range,
- // so move back one... (findHandle can't cope with mid-instruction indices)
- if (end != null) {
- end = end.getPrev();
- }
- // Repair malformed handles
- if (null == start) {
- start = il.getStart();
- }
- if (null == end) {
- end = il.getEnd();
- }
-
- addLocalVariable(l.getName(), Type.getType(l.getSignature()), l.getIndex(), start, end);
- }
- }
- } else {
- addCodeAttribute(a);
- }
- }
- } else if (a instanceof ExceptionTable) {
- String[] names = ((ExceptionTable) a).getExceptionNames();
- for (String s : names) {
- addException(s);
- }
- } else if (a instanceof RuntimeAnnos) {
- RuntimeAnnos runtimeAnnotations = (RuntimeAnnos) a;
- List<AnnotationGen> l = runtimeAnnotations.getAnnotations();
- annotationList.addAll(l);
- // for (Iterator<AnnotationGen> it = l.iterator(); it.hasNext();) {
- // AnnotationGen element = it.next();
- // addAnnotation(new AnnotationGen(element, cp, false));
- // }
- } else {
- addAttribute(a);
- }
- }
- }
-
- public LocalVariableGen addLocalVariable(String name, Type type, int slot, InstructionHandle start, InstructionHandle end) {
- int size = type.getSize();
- if (slot + size > maxLocals) {
- maxLocals = slot + size;
- }
- LocalVariableGen l = new LocalVariableGen(slot, name, type, start, end);
- int i = localVariablesList.indexOf(l);
- if (i >= 0) {
- localVariablesList.set(i, l); // Overwrite if necessary
- } else {
- localVariablesList.add(l);
- }
- return l;
- }
-
- /**
- * Adds a local variable to this method and assigns an index automatically.
- *
- * @param name variable name
- * @param type variable type
- * @param start from where the variable is valid, if this is null, it is valid from the start
- * @param end until where the variable is valid, if this is null, it is valid to the end
- * @return new local variable object
- * @see LocalVariable
- */
- public LocalVariableGen addLocalVariable(String name, Type type, InstructionHandle start, InstructionHandle end) {
- return addLocalVariable(name, type, maxLocals, start, end);
- }
-
- /**
- * Remove a local variable, its slot will not be reused, if you do not use addLocalVariable with an explicit index argument.
- */
- public void removeLocalVariable(LocalVariableGen l) {
- localVariablesList.remove(l);
- }
-
- /**
- * Remove all local variables.
- */
- public void removeLocalVariables() {
- localVariablesList.clear();
- }
-
- /**
- * Sort local variables by index
- */
- private static final void sort(LocalVariableGen[] vars, int l, int r) {
- int i = l, j = r;
- int m = vars[(l + r) / 2].getIndex();
- LocalVariableGen h;
-
- do {
- while (vars[i].getIndex() < m) {
- i++;
- }
- while (m < vars[j].getIndex()) {
- j--;
- }
-
- if (i <= j) {
- h = vars[i];
- vars[i] = vars[j];
- vars[j] = h; // Swap elements
- i++;
- j--;
- }
- } while (i <= j);
-
- if (l < j) {
- sort(vars, l, j);
- }
- if (i < r) {
- sort(vars, i, r);
- }
- }
-
- /*
- * If the range of the variable has not been set yet, it will be set to be valid from the start to the end of the instruction
- * list.
- *
- * @return array of declared local variables sorted by index
- */
- public LocalVariableGen[] getLocalVariables() {
- int size = localVariablesList.size();
- LocalVariableGen[] lg = new LocalVariableGen[size];
- localVariablesList.toArray(lg);
-
- for (int i = 0; i < size; i++) {
- if (lg[i].getStart() == null) {
- lg[i].setStart(il.getStart());
- }
-
- if (lg[i].getEnd() == null) {
- lg[i].setEnd(il.getEnd());
- }
- }
-
- if (size > 1) {
- sort(lg, 0, size - 1);
- }
-
- return lg;
- }
-
- /**
- * @return `LocalVariableTable' attribute of all the local variables of this method.
- */
- public LocalVariableTable getLocalVariableTable(ConstantPool cp) {
- LocalVariableGen[] lg = getLocalVariables();
- int size = lg.length;
- LocalVariable[] lv = new LocalVariable[size];
-
- for (int i = 0; i < size; i++) {
- lv[i] = lg[i].getLocalVariable(cp);
- }
-
- return new LocalVariableTable(cp.addUtf8("LocalVariableTable"), 2 + lv.length * 10, lv, cp);
- }
-
- /**
- * Give an instruction a line number corresponding to the source code line.
- *
- * @param ih instruction to tag
- * @return new line number object
- * @see LineNumber
- */
- public LineNumberGen addLineNumber(InstructionHandle ih, int src_line) {
- LineNumberGen l = new LineNumberGen(ih, src_line);
- lineNumbersList.add(l);
- return l;
- }
-
- /**
- * Remove a line number.
- */
- public void removeLineNumber(LineNumberGen l) {
- lineNumbersList.remove(l);
- }
-
- /**
- * Remove all line numbers.
- */
- public void removeLineNumbers() {
- lineNumbersList.clear();
- }
-
- /*
- * @return array of line numbers
- */
- public LineNumberGen[] getLineNumbers() {
- LineNumberGen[] lg = new LineNumberGen[lineNumbersList.size()];
- lineNumbersList.toArray(lg);
- return lg;
- }
-
- /**
- * @return 'LineNumberTable' attribute for all the local variables of this method.
- */
- public LineNumberTable getLineNumberTable(ConstantPool cp) {
- int size = lineNumbersList.size();
- LineNumber[] ln = new LineNumber[size];
-
- for (int i = 0; i < size; i++) {
- ln[i] = lineNumbersList.get(i).getLineNumber();
- }
-
- return new LineNumberTable(cp.addUtf8("LineNumberTable"), 2 + ln.length * 4, ln, cp);
- }
-
- /**
- * Add an exception handler, i.e., specify region where a handler is active and an instruction where the actual handling is
- * done.
- *
- * @param start_pc Start of region (inclusive)
- * @param end_pc End of region (inclusive)
- * @param handler_pc Where handling is done
- * @param catch_type class type of handled exception or null if any exception is handled
- * @return new exception handler object
- */
- public CodeExceptionGen addExceptionHandler(InstructionHandle start_pc, InstructionHandle end_pc, InstructionHandle handler_pc,
- ObjectType catch_type) {
- if ((start_pc == null) || (end_pc == null) || (handler_pc == null)) {
- throw new ClassGenException("Exception handler target is null instruction");
- }
-
- CodeExceptionGen c = new CodeExceptionGen(start_pc, end_pc, handler_pc, catch_type);
- exceptionsList.add(c);
- return c;
- }
-
- /**
- * Remove an exception handler.
- */
- public void removeExceptionHandler(CodeExceptionGen c) {
- exceptionsList.remove(c);
- }
-
- /**
- * Remove all line numbers.
- */
- public void removeExceptionHandlers() {
- exceptionsList.clear();
- }
-
- /*
- * @return array of declared exception handlers
- */
- public CodeExceptionGen[] getExceptionHandlers() {
- CodeExceptionGen[] cg = new CodeExceptionGen[exceptionsList.size()];
- exceptionsList.toArray(cg);
- return cg;
- }
-
- /**
- * @return code exceptions for `Code' attribute
- */
- private CodeException[] getCodeExceptions() {
- int size = exceptionsList.size();
- CodeException[] c_exc = new CodeException[size];
-
- try {
- for (int i = 0; i < size; i++) {
- CodeExceptionGen c = exceptionsList.get(i);
- c_exc[i] = c.getCodeException(cp);
- }
- } catch (ArrayIndexOutOfBoundsException e) {
- }
-
- return c_exc;
- }
-
- /**
- * Add an exception possibly thrown by this method.
- *
- * @param class_name (fully qualified) name of exception
- */
- public void addException(String class_name) {
- exceptionsThrown.add(class_name);
- }
-
- /**
- * Remove an exception.
- */
- public void removeException(String c) {
- exceptionsThrown.remove(c);
- }
-
- /**
- * Remove all exceptions.
- */
- public void removeExceptions() {
- exceptionsThrown.clear();
- }
-
- /*
- * @return array of thrown exceptions
- */
- public String[] getExceptions() {
- String[] e = new String[exceptionsThrown.size()];
- exceptionsThrown.toArray(e);
- return e;
- }
-
- /**
- * @return `Exceptions' attribute of all the exceptions thrown by this method.
- */
- private ExceptionTable getExceptionTable(ConstantPool cp) {
- int size = exceptionsThrown.size();
- int[] ex = new int[size];
-
- try {
- for (int i = 0; i < size; i++) {
- ex[i] = cp.addClass(exceptionsThrown.get(i));
- }
- } catch (ArrayIndexOutOfBoundsException e) {
- }
-
- return new ExceptionTable(cp.addUtf8("Exceptions"), 2 + 2 * size, ex, cp);
- }
-
- /**
- * Add an attribute to the code. Currently, the JVM knows about the LineNumberTable, LocalVariableTable and StackMap attributes,
- * where the former two will be generated automatically and the latter is used for the MIDP only. Other attributes will be
- * ignored by the JVM but do no harm.
- *
- * @param a attribute to be added
- */
- public void addCodeAttribute(Attribute a) {
- codeAttributesList.add(a);
- }
-
- public void addParameterAnnotationsAsAttribute(ConstantPool cp) {
- if (!hasParameterAnnotations) {
- return;
- }
- Attribute[] attrs = Utility.getParameterAnnotationAttributes(cp, param_annotations);
- if (attrs != null) {
- for (Attribute attr : attrs) {
- addAttribute(attr);
- }
- }
- }
-
- /**
- * Remove a code attribute.
- */
- public void removeCodeAttribute(Attribute a) {
- codeAttributesList.remove(a);
- }
-
- /**
- * Remove all code attributes.
- */
- public void removeCodeAttributes() {
- codeAttributesList.clear();
- }
-
- /**
- * @return all attributes of this method.
- */
- public Attribute[] getCodeAttributes() {
- Attribute[] attributes = new Attribute[codeAttributesList.size()];
- codeAttributesList.toArray(attributes);
- return attributes;
- }
-
- /**
- * Get method object. Never forget to call setMaxStack() or setMaxStack(max), respectively, before calling this method (the same
- * applies for max locals).
- *
- * @return method object
- */
- public Method getMethod() {
- String signature = getSignature();
- int name_index = cp.addUtf8(name);
- int signature_index = cp.addUtf8(signature);
-
- /*
- * Also updates positions of instructions, i.e., their indices
- */
- byte[] byte_code = null;
-
- if (il != null) {
- try {
- byte_code = il.getByteCode();
- } catch (Exception e) {
- throw new IllegalStateException("Unexpected problem whilst preparing bytecode for " + this.getClassName() + "."
- + this.getName() + this.getSignature(), e);
- }
- }
-
- LineNumberTable lnt = null;
- LocalVariableTable lvt = null;
- // J5TODO: LocalVariableTypeTable support!
-
- /*
- * Create LocalVariableTable and LineNumberTable attributes (for debuggers, e.g.)
- */
- if ((localVariablesList.size() > 0) && !stripAttributes) {
- addCodeAttribute(lvt = getLocalVariableTable(cp));
- }
-
- if ((lineNumbersList.size() > 0) && !stripAttributes) {
- addCodeAttribute(lnt = getLineNumberTable(cp));
- }
-
- Attribute[] code_attrs = getCodeAttributes();
-
- /*
- * Each attribute causes 6 additional header bytes
- */
- int attrs_len = 0;
- for (Attribute code_attr : code_attrs) {
- attrs_len += (code_attr.getLength() + 6);
- }
-
- CodeException[] c_exc = getCodeExceptions();
- int exc_len = c_exc.length * 8; // Every entry takes 8 bytes
-
- Code code = null;
-
- if ((il != null) && !isAbstract()) {
- // Remove any stale code attribute
- List<Attribute> attributes = getAttributes();
- for (Attribute a : attributes) {
- if (a instanceof Code) {
- removeAttribute(a);
- }
- }
-
- code = new Code(cp.addUtf8("Code"), 8 + byte_code.length + // prologue byte code
- 2 + exc_len + // exceptions
- 2 + attrs_len, // attributes
- maxStack, maxLocals, byte_code, c_exc, code_attrs, cp);
-
- addAttribute(code);
- }
-
- addAnnotationsAsAttribute(cp);
- addParameterAnnotationsAsAttribute(cp);
-
- ExceptionTable et = null;
-
- if (exceptionsThrown.size() > 0) {
- addAttribute(et = getExceptionTable(cp)); // Add `Exceptions' if there are "throws" clauses
- }
-
- Method m = new Method(modifiers, name_index, signature_index, getAttributesImmutable(), cp);
-
- // Undo effects of adding attributes
- // OPTIMIZE why redo this? is there a better way to clean up?
- if (lvt != null) {
- removeCodeAttribute(lvt);
- }
- if (lnt != null) {
- removeCodeAttribute(lnt);
- }
- if (code != null) {
- removeAttribute(code);
- }
- if (et != null) {
- removeAttribute(et);
- }
- // J5TODO: Remove the annotation attributes that may have been added
- return m;
- }
-
- /**
- * Set maximum number of local variables.
- */
- public void setMaxLocals(int m) {
- maxLocals = m;
- }
-
- public int getMaxLocals() {
- return maxLocals;
- }
-
- /**
- * Set maximum stack size for this method.
- */
- public void setMaxStack(int m) {
- maxStack = m;
- }
-
- public int getMaxStack() {
- return maxStack;
- }
-
- /**
- * @return class that contains this method
- */
- public String getClassName() {
- return classname;
- }
-
- public void setClassName(String class_name) {
- this.classname = class_name;
- }
-
- public void setReturnType(Type return_type) {
- setType(return_type);
- }
-
- public Type getReturnType() {
- return getType();
- }
-
- public void setArgumentTypes(Type[] arg_types) {
- this.parameterTypes = arg_types;
- }
-
- public Type[] getArgumentTypes() {
- return this.parameterTypes;
- }// OPTIMIZE dont need clone here? (Type[])arg_types.clone(); }
-
- public void setArgumentType(int i, Type type) {
- parameterTypes[i] = type;
- }
-
- public Type getArgumentType(int i) {
- return parameterTypes[i];
- }
-
- public void setArgumentNames(String[] arg_names) {
- this.parameterNames = arg_names;
- }
-
- public String[] getArgumentNames() {
- if (parameterNames != null) {
- return parameterNames.clone();
- } else {
- return new String[0];
- }
- }
-
- public void setArgumentName(int i, String name) {
- parameterNames[i] = name;
- }
-
- public String getArgumentName(int i) {
- return parameterNames[i];
- }
-
- public InstructionList getInstructionList() {
- return il;
- }
-
- public void setInstructionList(InstructionList il) {
- this.il = il;
- }
-
- @Override
- public String getSignature() {
- return Utility.toMethodSignature(type, parameterTypes);
- }
-
- /**
- * Computes max. stack size by performing control flow analysis.
- */
- public void setMaxStack() {
- if (il != null) {
- maxStack = getMaxStack(cp, il, getExceptionHandlers());
- } else {
- maxStack = 0;
- }
- }
-
- /**
- * Compute maximum number of local variables based on the parameter count and bytecode usage of variables.
- */
- public void setMaxLocals() {
- setMaxLocals(false);
- }
-
- /**
- * Compute maximum number of local variables.
- *
- * @param respectLocalVariableTable if true and the local variable table indicates more are in use
- * than the code suggests, respect the higher value from the local variable table data.
- */
- public void setMaxLocals(boolean respectLocalVariableTable) {
- if (il != null) {
- int max = isStatic() ? 0 : 1;
-
- if (parameterTypes != null) {
- for (Type parameterType : parameterTypes) {
- max += parameterType.getSize();
- }
- }
-
- for (InstructionHandle ih = il.getStart(); ih != null; ih = ih.getNext()) {
- Instruction ins = ih.getInstruction();
-
- if ((ins instanceof InstructionLV) || (ins instanceof RET)) {
- int index = ins.getIndex() + ins.getType(cp).getSize();
-
- if (index > max) {
- max = index;
- }
- }
- }
- if (!respectLocalVariableTable || max > maxLocals) {
- maxLocals = max;
- }
- } else {
- if (!respectLocalVariableTable) {
- maxLocals = 0;
- }
- }
- }
-
- public void stripAttributes(boolean flag) {
- stripAttributes = flag;
- }
-
- static final class BranchTarget {
- InstructionHandle target;
- int stackDepth;
-
- BranchTarget(InstructionHandle target, int stackDepth) {
- this.target = target;
- this.stackDepth = stackDepth;
- }
- }
-
- static final class BranchStack {
- Stack<BranchTarget> branchTargets = new Stack<BranchTarget>();
- Hashtable<InstructionHandle, BranchTarget> visitedTargets = new Hashtable<InstructionHandle, BranchTarget>();
-
- public void push(InstructionHandle target, int stackDepth) {
- if (visited(target)) {
- return;
- }
-
- branchTargets.push(visit(target, stackDepth));
- }
-
- public BranchTarget pop() {
- if (!branchTargets.empty()) {
- BranchTarget bt = branchTargets.pop();
- return bt;
- }
-
- return null;
- }
-
- private final BranchTarget visit(InstructionHandle target, int stackDepth) {
- BranchTarget bt = new BranchTarget(target, stackDepth);
- visitedTargets.put(target, bt);
-
- return bt;
- }
-
- private final boolean visited(InstructionHandle target) {
- return (visitedTargets.get(target) != null);
- }
- }
-
- /**
- * Computes stack usage of an instruction list by performing control flow analysis.
- *
- * @return maximum stack depth used by method
- */
- public static int getMaxStack(ConstantPool cp, InstructionList il, CodeExceptionGen[] et) {
- BranchStack branchTargets = new BranchStack();
-
- int stackDepth = 0;
- int maxStackDepth = 0;
-
- /*
- * Initially, populate the branch stack with the exception handlers, because these aren't (necessarily) branched to
- * explicitly. In each case, the stack will have depth 1, containing the exception object.
- */
- for (CodeExceptionGen codeExceptionGen : et) {
- InstructionHandle handlerPos = codeExceptionGen.getHandlerPC();
- if (handlerPos != null) {
- // it must be at least 1 since there is an exception handler
- maxStackDepth = 1;
- branchTargets.push(handlerPos, 1);
- }
- }
-
- InstructionHandle ih = il.getStart();
- while (ih != null) {
- Instruction instruction = ih.getInstruction();
- short opcode = instruction.opcode;
- int prod = instruction.produceStack(cp);
- int con = instruction.consumeStack(cp);
- int delta = prod - con;
-
- stackDepth += delta;
- if (stackDepth > maxStackDepth) {
- maxStackDepth = stackDepth;
- }
-
- // choose the next instruction based on whether current is a branch.
- if (instruction instanceof InstructionBranch) {
- InstructionBranch branch = (InstructionBranch) instruction;
- if (instruction instanceof InstructionSelect) {
- // explore all of the select's targets. the default target is handled below.
- InstructionSelect select = (InstructionSelect) branch;
- InstructionHandle[] targets = select.getTargets();
- for (InstructionHandle target : targets) {
- branchTargets.push(target, stackDepth);
- }
- // nothing to fall through to.
- ih = null;
- } else if (!(branch.isIfInstruction())) {
- // if an instruction that comes back to following PC,
- // push next instruction, with stack depth reduced by 1.
- if (opcode == Constants.JSR || opcode == Constants.JSR_W) {
- branchTargets.push(ih.getNext(), stackDepth - 1);
- }
- ih = null;
- }
- // for all branches, the target of the branch is pushed on the branch stack.
- // conditional branches have a fall through case, selects don't, and
- // jsr/jsr_w return to the next instruction.
- branchTargets.push(branch.getTarget(), stackDepth);
- } else {
- // check for instructions that terminate the method.
- if (opcode == Constants.ATHROW || opcode == Constants.RET
- || (opcode >= Constants.IRETURN && opcode <= Constants.RETURN)) {
- ih = null;
- }
- }
- // normal case, go to the next instruction.
- if (ih != null) {
- ih = ih.getNext();
- }
- // if we have no more instructions, see if there are any deferred branches to explore.
- if (ih == null) {
- BranchTarget bt = branchTargets.pop();
- if (bt != null) {
- ih = bt.target;
- stackDepth = bt.stackDepth;
- }
- }
- }
- return maxStackDepth;
- }
-
- /**
- * Return string representation close to declaration format, `public static void main(String[]) throws IOException', e.g.
- *
- * @return String representation of the method.
- */
- @Override
- public final String toString() {
- String access = Utility.accessToString(modifiers);
- String signature = Utility.toMethodSignature(type, parameterTypes);
-
- signature = Utility.methodSignatureToString(signature, name, access, true, getLocalVariableTable(cp));
-
- StringBuffer buf = new StringBuffer(signature);
-
- if (exceptionsThrown.size() > 0) {
- for (String s : exceptionsThrown) {
- buf.append("\n\t\tthrows " + s);
- }
- }
-
- return buf.toString();
- }
-
- // J5TODO: Should param_annotations be an array of arrays? Rather than an array of lists, this
- // is more likely to suggest to the caller it is readonly (which a List does not).
- /**
- * Return a list of AnnotationGen objects representing parameter annotations
- */
- public List<AnnotationGen> getAnnotationsOnParameter(int i) {
- ensureExistingParameterAnnotationsUnpacked();
- if (!hasParameterAnnotations || i > parameterTypes.length) {
- return null;
- }
- return param_annotations[i];
- }
-
- /**
- * Goes through the attributes on the method and identifies any that are RuntimeParameterAnnotations, extracting their contents
- * and storing them as parameter annotations. There are two kinds of parameter annotation - visible and invisible. Once they
- * have been unpacked, these attributes are deleted. (The annotations will be rebuilt as attributes when someone builds a Method
- * object out of this MethodGen object).
- */
- private void ensureExistingParameterAnnotationsUnpacked() {
- if (haveUnpackedParameterAnnotations) {
- return;
- }
- // Find attributes that contain parameter annotation data
- List<Attribute> attrs = getAttributes();
- RuntimeParamAnnos paramAnnVisAttr = null;
- RuntimeParamAnnos paramAnnInvisAttr = null;
-
- for (Attribute attribute : attrs) {
- if (attribute instanceof RuntimeParamAnnos) {
-
- if (!hasParameterAnnotations) {
- param_annotations = new List[parameterTypes.length];
- for (int j = 0; j < parameterTypes.length; j++) {
- param_annotations[j] = new ArrayList<AnnotationGen>();
- }
- }
-
- hasParameterAnnotations = true;
- RuntimeParamAnnos rpa = (RuntimeParamAnnos) attribute;
- if (rpa.areVisible()) {
- paramAnnVisAttr = rpa;
- } else {
- paramAnnInvisAttr = rpa;
- }
- for (int j = 0; j < parameterTypes.length; j++) {
- // This returns Annotation[] ...
- AnnotationGen[] annos = rpa.getAnnotationsOnParameter(j);
- // ... which needs transforming into an AnnotationGen[] ...
- // List<AnnotationGen> mutable = makeMutableVersion(immutableArray);
- // ... then add these to any we already know about
- for (AnnotationGen anAnnotation : annos) {
- param_annotations[j].add(anAnnotation);
- }
- }
- }
- }
- if (paramAnnVisAttr != null) {
- removeAttribute(paramAnnVisAttr);
- }
- if (paramAnnInvisAttr != null) {
- removeAttribute(paramAnnInvisAttr);
- }
- haveUnpackedParameterAnnotations = true;
- }
-
- private List /* AnnotationGen */<AnnotationGen> makeMutableVersion(AnnotationGen[] mutableArray) {
- List<AnnotationGen> result = new ArrayList<AnnotationGen>();
- for (AnnotationGen annotationGen : mutableArray) {
- result.add(new AnnotationGen(annotationGen, getConstantPool(), false));
- }
- return result;
- }
-
- public void addParameterAnnotation(int parameterIndex, AnnotationGen annotation) {
- ensureExistingParameterAnnotationsUnpacked();
- if (!hasParameterAnnotations) {
- param_annotations = new List[parameterTypes.length];
- hasParameterAnnotations = true;
- }
- List<AnnotationGen> existingAnnotations = param_annotations[parameterIndex];
- if (existingAnnotations != null) {
- existingAnnotations.add(annotation);
- } else {
- List<AnnotationGen> l = new ArrayList<AnnotationGen>();
- l.add(annotation);
- param_annotations[parameterIndex] = l;
- }
- }
- }
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