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- /*
- * Javassist, a Java-bytecode translator toolkit.
- * Copyright (C) 1999-2004 Shigeru Chiba. All Rights Reserved.
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. Alternatively, the contents of this file may be used under
- * the terms of the GNU Lesser General Public License Version 2.1 or later.
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- */
-
- package javassist;
-
- import javassist.bytecode.*;
- import javassist.compiler.Javac;
- import javassist.compiler.CompileError;
- import javassist.expr.ExprEditor;
-
- /**
- * <code>CtBehavior</code> represents a method, a constructor,
- * or a static constructor (class initializer).
- * It is the abstract super class of
- * <code>CtMethod</code> and <code>CtConstructor</code>.
- */
- public abstract class CtBehavior extends CtMember {
- protected MethodInfo methodInfo;
-
- protected CtBehavior(CtClass clazz, MethodInfo minfo) {
- super(clazz);
- methodInfo = minfo;
- }
-
- protected void extendToString(StringBuffer buffer) {
- buffer.append(' ');
- buffer.append(getName());
- buffer.append(' ');
- buffer.append(methodInfo.getDescriptor());
- }
-
- /**
- * Returns the MethodInfo representing this method/constructor in the
- * class file.
- */
- public MethodInfo getMethodInfo() {
- declaringClass.checkModify();
- return methodInfo;
- }
-
- /**
- * Undocumented method. Do not use; internal-use only.
- */
- public MethodInfo getMethodInfo2() { return methodInfo; }
-
- /**
- * Obtains the modifiers of the method/constructor.
- *
- * @return modifiers encoded with
- * <code>javassist.Modifier</code>.
- * @see Modifier
- */
- public int getModifiers() {
- return AccessFlag.toModifier(methodInfo.getAccessFlags());
- }
-
- /**
- * Sets the encoded modifiers of the method/constructor.
- *
- * <p>Changing the modifiers may cause a problem.
- * For example, if a non-static method is changed to static,
- * the method will be rejected by the bytecode verifier.
- *
- * @see Modifier
- */
- public void setModifiers(int mod) {
- declaringClass.checkModify();
- methodInfo.setAccessFlags(AccessFlag.of(mod));
- }
-
- /**
- * Obtains parameter types of this method/constructor.
- */
- public CtClass[] getParameterTypes() throws NotFoundException {
- return Descriptor.getParameterTypes(methodInfo.getDescriptor(),
- declaringClass.getClassPool());
- }
-
- /**
- * Obtains the type of the returned value.
- */
- CtClass getReturnType0() throws NotFoundException {
- return Descriptor.getReturnType(methodInfo.getDescriptor(),
- declaringClass.getClassPool());
- }
-
- /**
- * Returns the character string representing the parameter types
- * and the return type. If two methods/constructors have
- * the same parameter types
- * and the return type, <code>getSignature()</code> returns the
- * same string (the return type of constructors is <code>void</code>).
- */
- public String getSignature() {
- return methodInfo.getDescriptor();
- }
-
- /**
- * Obtains exceptions that this method/constructor may throw.
- */
- public CtClass[] getExceptionTypes() throws NotFoundException {
- String[] exceptions;
- ExceptionsAttribute ea = methodInfo.getExceptionsAttribute();
- if (ea == null)
- exceptions = null;
- else
- exceptions = ea.getExceptions();
-
- return declaringClass.getClassPool().get(exceptions);
- }
-
- /**
- * Sets exceptions that this method/constructor may throw.
- */
- public void setExceptionTypes(CtClass[] types) throws NotFoundException {
- declaringClass.checkModify();
- if (types == null) {
- methodInfo.removeExceptionsAttribute();
- return;
- }
-
- String[] names = new String[types.length];
- for (int i = 0; i < types.length; ++i)
- names[i] = types[i].getName();
-
- ExceptionsAttribute ea = methodInfo.getExceptionsAttribute();
- if (ea == null) {
- ea = new ExceptionsAttribute(methodInfo.getConstPool());
- methodInfo.setExceptionsAttribute(ea);
- }
-
- ea.setExceptions(names);
- }
-
- /**
- * Returns true if the body is empty.
- */
- public abstract boolean isEmpty();
-
- /**
- * Sets a method/constructor body.
- *
- * @param src the source code representing the body.
- * It must be a single statement or block.
- * If it is <code>null</code>, the substituted
- * body does nothing except returning zero or null.
- */
- public void setBody(String src) throws CannotCompileException {
- setBody(src, null, null);
- }
-
- /**
- * Sets a method/constructor body.
- *
- * @param src the source code representing the body.
- * It must be a single statement or block.
- * If it is <code>null</code>, the substituted
- * body does nothing except returning zero or null.
- * @param delegateObj the source text specifying the object
- * that is called on by <code>$proceed()</code>.
- * @param delegateMethod the name of the method
- * that is called by <code>$proceed()</code>.
- */
- public void setBody(String src,
- String delegateObj, String delegateMethod)
- throws CannotCompileException
- {
- declaringClass.checkModify();
- try {
- Javac jv = new Javac(declaringClass);
- if (delegateMethod != null)
- jv.recordProceed(delegateObj, delegateMethod);
-
- Bytecode b = jv.compileBody(this, src);
- methodInfo.setCodeAttribute(b.toCodeAttribute());
- methodInfo.setAccessFlags(methodInfo.getAccessFlags()
- & ~AccessFlag.ABSTRACT);
- }
- catch (CompileError e) {
- throw new CannotCompileException(e);
- }
- }
-
- static void setBody0(CtClass srcClass, MethodInfo srcInfo,
- CtClass destClass, MethodInfo destInfo,
- ClassMap map)
- throws CannotCompileException
- {
- destClass.checkModify();
-
- if (map == null)
- map = new ClassMap();
-
- map.put(srcClass.getName(), destClass.getName());
- try {
- CodeAttribute cattr = srcInfo.getCodeAttribute();
- if (cattr != null) {
- ConstPool cp = destInfo.getConstPool();
- CodeAttribute ca = (CodeAttribute)cattr.copy(cp, map);
- destInfo.setCodeAttribute(ca);
- }
- }
- catch (CodeAttribute.RuntimeCopyException e) {
- /* the exception may be thrown by copy() in CodeAttribute.
- */
- throw new CannotCompileException(e);
- }
-
- destInfo.setAccessFlags(destInfo.getAccessFlags()
- & ~AccessFlag.ABSTRACT);
- }
-
- /**
- * Obtains an attribute with the given name.
- * If that attribute is not found in the class file, this
- * method returns null.
- *
- * @param name attribute name
- */
- public byte[] getAttribute(String name) {
- AttributeInfo ai = methodInfo.getAttribute(name);
- if (ai == null)
- return null;
- else
- return ai.get();
- }
-
- /**
- * Adds an attribute. The attribute is saved in the class file.
- *
- * @param name attribute name
- * @param data attribute value
- */
- public void setAttribute(String name, byte[] data) {
- declaringClass.checkModify();
- methodInfo.addAttribute(new AttributeInfo(methodInfo.getConstPool(),
- name, data));
- }
-
- /**
- * Declares to use <code>$cflow</code> for this method/constructor.
- * If <code>$cflow</code> is used, the class files modified
- * with Javassist requires a support class
- * <code>javassist.runtime.Cflow</code> at runtime
- * (other Javassist classes are not required at runtime).
- *
- * <p>Every <code>$cflow</code> variable is given a unique name.
- * For example, if the given name is <code>"Point.paint"</code>,
- * then the variable is indicated by <code>$cflow(Point.paint)</code>.
- *
- * @param name <code>$cflow</code> name. It can include
- * alphabets, numbers, <code>_</code>,
- * <code>$</code>, and <code>.</code> (dot).
- *
- * @see javassist.runtime.Cflow
- */
- public void useCflow(String name) throws CannotCompileException {
- CtClass cc = declaringClass;
- cc.checkModify();
- ClassPool pool = cc.getClassPool();
- String fname;
- int i = 0;
- while (true) {
- fname = "_cflow$" + i++;
- try {
- cc.getDeclaredField(fname);
- }
- catch(NotFoundException e) {
- break;
- }
- }
-
- pool.recordCflow(name, declaringClass.getName(), fname);
- try {
- CtClass type = pool.get("javassist.runtime.Cflow");
- CtField field = new CtField(type, fname, cc);
- field.setModifiers(Modifier.PUBLIC | Modifier.STATIC);
- cc.addField(field, CtField.Initializer.byNew(type));
- insertBefore(fname + ".enter();");
- String src = fname + ".exit();";
- insertAfter(src, true);
- }
- catch (NotFoundException e) {
- throw new CannotCompileException(e);
- }
- }
-
- /**
- * Modifies the method/constructor body.
- *
- * @param converter specifies how to modify.
- */
- public void instrument(CodeConverter converter)
- throws CannotCompileException
- {
- declaringClass.checkModify();
- ConstPool cp = methodInfo.getConstPool();
- converter.doit(getDeclaringClass(), methodInfo, cp);
- }
-
- /**
- * Modifies the method/constructor body.
- *
- * @param editor specifies how to modify.
- */
- public void instrument(ExprEditor editor)
- throws CannotCompileException
- {
- // if the class is not frozen,
- // does not trun the modified flag on.
- if (declaringClass.isFrozen())
- declaringClass.checkModify();
-
- if (editor.doit(declaringClass, methodInfo))
- declaringClass.checkModify();
- }
-
- /**
- * Inserts bytecode at the beginning of the body.
- *
- * <p>If this object represents a constructor,
- * the bytecode is inserted before
- * a constructor in the super class or this class is called.
- * Therefore, the inserted bytecode is subject to constraints described
- * in Section 4.8.2 of The Java Virtual Machine Specification (2nd ed).
- * For example, it cannot access instance fields or methods
- * although it can access static fields and methods.
- * Use <code>insertBeforeBody()</code> in <code>CtConstructor</code>.
- *
- * @param src the source code representing the inserted bytecode.
- * It must be a single statement or block.
- * @see CtConstructor#insertBeforeBody(String)
- */
- public void insertBefore(String src) throws CannotCompileException {
- declaringClass.checkModify();
- CodeAttribute ca = methodInfo.getCodeAttribute();
- if (ca == null)
- throw new CannotCompileException("no method body");
-
- CodeIterator iterator = ca.iterator();
- Javac jv = new Javac(declaringClass);
- try {
- int nvars = jv.recordParams(getParameterTypes(),
- Modifier.isStatic(getModifiers()));
- jv.recordParamNames(ca, nvars);
- jv.compileStmnt(src);
- Bytecode b = jv.getBytecode();
- int stack = b.getMaxStack();
- int locals = b.getMaxLocals();
-
- if (stack > ca.getMaxStack())
- ca.setMaxStack(stack);
-
- if (locals > ca.getMaxLocals())
- ca.setMaxLocals(locals);
-
- int pos = iterator.insertEx(b.get());
- iterator.insert(b.getExceptionTable(), pos);
- }
- catch (NotFoundException e) {
- throw new CannotCompileException(e);
- }
- catch (CompileError e) {
- throw new CannotCompileException(e);
- }
- catch (BadBytecode e) {
- throw new CannotCompileException(e);
- }
- }
-
- /**
- * Inserts bytecode at the end of the body.
- * The bytecode is inserted just before every return insturction.
- * It is not executed when an exception is thrown.
- *
- * @param src the source code representing the inserted bytecode.
- * It must be a single statement or block.
- */
- public void insertAfter(String src)
- throws CannotCompileException
- {
- insertAfter(src, false);
- }
-
- /**
- * Inserts bytecode at the end of the body.
- * The bytecode is inserted just before every return insturction.
- *
- * @param src the source code representing the inserted bytecode.
- * It must be a single statement or block.
- * @param asFinally true if the inserted bytecode is executed
- * not only when the control normally returns
- * but also when an exception is thrown.
- */
- public void insertAfter(String src, boolean asFinally)
- throws CannotCompileException
- {
- declaringClass.checkModify();
- ConstPool pool = methodInfo.getConstPool();
- CodeAttribute ca = methodInfo.getCodeAttribute();
- if (ca == null)
- throw new CannotCompileException("no method body");
-
- CodeIterator iterator = ca.iterator();
- int retAddr = ca.getMaxLocals();
- Bytecode b = new Bytecode(pool, 0, retAddr + 1);
- b.setStackDepth(ca.getMaxStack() + 1);
- Javac jv = new Javac(b, declaringClass);
- try {
- int nvars = jv.recordParams(getParameterTypes(),
- Modifier.isStatic(getModifiers()));
- jv.recordParamNames(ca, nvars);
- CtClass rtype = getReturnType0();
- int varNo = jv.recordReturnType(rtype, true);
-
- int handlerLen = insertAfterHandler(asFinally, b, rtype, varNo);
-
- byte[] save = makeSaveCode(pool, rtype, varNo);
- byte[] restore = makeRestoreCode(b, pool, rtype, varNo);
-
- b.addAstore(retAddr);
- jv.compileStmnt(src);
- b.addRet(retAddr);
- ca.setMaxStack(b.getMaxStack());
- ca.setMaxLocals(b.getMaxLocals());
-
- int gapPos = iterator.append(b.get());
- iterator.append(b.getExceptionTable(), gapPos);
-
- if (asFinally)
- ca.getExceptionTable().add(0, gapPos, gapPos, 0);
-
- int gapLen = iterator.getCodeLength() - gapPos - handlerLen;
- int subr = iterator.getCodeLength() - gapLen;
-
- while (iterator.hasNext()) {
- int pos = iterator.next();
- if (pos >= subr)
- break;
-
- int c = iterator.byteAt(pos);
- if (c == Opcode.ARETURN || c == Opcode.IRETURN
- || c == Opcode.FRETURN || c == Opcode.LRETURN
- || c == Opcode.DRETURN || c == Opcode.RETURN) {
- insertJSR(iterator, subr, pos, save, restore);
- subr = iterator.getCodeLength() - gapLen;
- }
- }
- }
- catch (NotFoundException e) {
- throw new CannotCompileException(e);
- }
- catch (CompileError e) {
- throw new CannotCompileException(e);
- }
- catch (BadBytecode e) {
- throw new CannotCompileException(e);
- }
- }
-
- private byte[] makeSaveCode(ConstPool cp, CtClass rtype, int varNo) {
- Bytecode b = new Bytecode(cp, 0, 0);
- if (rtype == CtClass.voidType) {
- b.addOpcode(Opcode.ACONST_NULL);
- b.addAstore(varNo);
- return b.get();
- }
- else {
- b.addStore(varNo, rtype);
- return b.get();
- }
- }
-
- private byte[] makeRestoreCode(Bytecode code, ConstPool cp,
- CtClass rtype, int varNo) {
- if (rtype == CtClass.voidType) {
- if (code.getMaxLocals() < 1)
- code.setMaxLocals(1);
-
- return new byte[0];
- }
- else {
- Bytecode b = new Bytecode(cp, 0, 0);
- b.addLoad(varNo, rtype);
- return b.get();
- }
- }
-
- private void insertJSR(CodeIterator iterator, int subr, int pos,
- byte[] save, byte[] restore)
- throws BadBytecode
- {
- int gapSize = 5 + save.length + restore.length;
- boolean wide = subr - pos > Short.MAX_VALUE - gapSize - 4;
- gapSize = iterator.insertGap(pos, wide ? gapSize : gapSize - 2);
-
- iterator.write(save, pos);
- pos += save.length;
- if (wide) {
- iterator.writeByte(Opcode.JSR_W, pos);
- iterator.write32bit(subr - pos + gapSize, pos + 1);
- pos += 5;
- }
- else {
- iterator.writeByte(Opcode.JSR, pos);
- iterator.write16bit(subr - pos + gapSize, pos + 1);
- pos += 3;
- }
-
- iterator.write(restore, pos);
- }
-
- private int insertAfterHandler(boolean asFinally, Bytecode b,
- CtClass rtype, int returnVarNo)
- {
- if (!asFinally)
- return 0;
-
- int var = b.getMaxLocals();
- b.incMaxLocals(1);
- int pc = b.currentPc();
- b.addAstore(var);
- if (rtype.isPrimitive()) {
- char c = ((CtPrimitiveType)rtype).getDescriptor();
- if (c == 'D') {
- b.addDconst(0.0);
- b.addDstore(returnVarNo);
- }
- else if (c == 'F') {
- b.addFconst(0);
- b.addFstore(returnVarNo);
- }
- else if (c == 'J') {
- b.addLconst(0);
- b.addLstore(returnVarNo);
- }
- else if (c != 'V') { // int, boolean, char, short, ...
- b.addIconst(0);
- b.addIstore(returnVarNo);
- }
- }
- else {
- b.addOpcode(Opcode.ACONST_NULL);
- b.addAstore(returnVarNo);
- }
-
- b.addOpcode(Opcode.JSR);
- int pc2 = b.currentPc();
- b.addIndex(0); // correct later
- b.addAload(var);
- b.addOpcode(Opcode.ATHROW);
- int pc3 = b.currentPc();
- b.write16bit(pc2, pc3 - pc2 + 1);
- return pc3 - pc;
- }
-
- /* -- OLD version --
-
- public void insertAfter(String src) throws CannotCompileException {
- declaringClass.checkModify();
- CodeAttribute ca = methodInfo.getCodeAttribute();
- CodeIterator iterator = ca.iterator();
- Bytecode b = new Bytecode(methodInfo.getConstPool(),
- ca.getMaxStack(), ca.getMaxLocals());
- b.setStackDepth(ca.getMaxStack());
- Javac jv = new Javac(b, declaringClass);
- try {
- jv.recordParams(getParameterTypes(),
- Modifier.isStatic(getModifiers()));
- CtClass rtype = getReturnType0();
- int varNo = jv.recordReturnType(rtype, true);
- boolean isVoid = rtype == CtClass.voidType;
- if (isVoid) {
- b.addOpcode(Opcode.ACONST_NULL);
- b.addAstore(varNo);
- jv.compileStmnt(src);
- }
- else {
- b.addStore(varNo, rtype);
- jv.compileStmnt(src);
- b.addLoad(varNo, rtype);
- }
-
- byte[] code = b.get();
- ca.setMaxStack(b.getMaxStack());
- ca.setMaxLocals(b.getMaxLocals());
- while (iterator.hasNext()) {
- int pos = iterator.next();
- int c = iterator.byteAt(pos);
- if (c == Opcode.ARETURN || c == Opcode.IRETURN
- || c == Opcode.FRETURN || c == Opcode.LRETURN
- || c == Opcode.DRETURN || c == Opcode.RETURN)
- iterator.insert(pos, code);
- }
- }
- catch (NotFoundException e) {
- throw new CannotCompileException(e);
- }
- catch (CompileError e) {
- throw new CannotCompileException(e);
- }
- catch (BadBytecode e) {
- throw new CannotCompileException(e);
- }
- }
- */
-
- /**
- * Adds a catch clause that handles an exception thrown in the
- * body. The catch clause must end with a return or throw statement.
- *
- * @param src the source code representing the catch clause.
- * It must be a single statement or block.
- * @param exceptionType the type of the exception handled by the
- * catch clause.
- */
- public void addCatch(String src, CtClass exceptionType)
- throws CannotCompileException
- {
- addCatch(src, exceptionType, "$e");
- }
-
- /**
- * Adds a catch clause that handles an exception thrown in the
- * body. The catch clause must end with a return or throw statement.
- *
- * @param src the source code representing the catch clause.
- * It must be a single statement or block.
- * @param exceptionType the type of the exception handled by the
- * catch clause.
- * @param exceptionName the name of the variable containing the
- * caught exception, for example,
- * <code>$e</code>.
- */
- public void addCatch(String src, CtClass exceptionType,
- String exceptionName)
- throws CannotCompileException
- {
- declaringClass.checkModify();
- ConstPool cp = methodInfo.getConstPool();
- CodeAttribute ca = methodInfo.getCodeAttribute();
- CodeIterator iterator = ca.iterator();
- Bytecode b = new Bytecode(cp, ca.getMaxStack(), ca.getMaxLocals());
- b.setStackDepth(1);
- Javac jv = new Javac(b, declaringClass);
- try {
- jv.recordParams(getParameterTypes(),
- Modifier.isStatic(getModifiers()));
- int var = jv.recordVariable(exceptionType, exceptionName);
- b.addAstore(var);
- jv.compileStmnt(src);
-
- int stack = b.getMaxStack();
- int locals = b.getMaxLocals();
-
- if (stack > ca.getMaxStack())
- ca.setMaxStack(stack);
-
- if (locals > ca.getMaxLocals())
- ca.setMaxLocals(locals);
-
- int len = iterator.getCodeLength();
- int pos = iterator.append(b.get());
- ca.getExceptionTable().add(0, len, len,
- cp.addClassInfo(exceptionType));
- iterator.append(b.getExceptionTable(), pos);
- }
- catch (NotFoundException e) {
- throw new CannotCompileException(e);
- }
- catch (CompileError e) {
- throw new CannotCompileException(e);
- }
- }
-
- /**
- * Inserts bytecode at the specified line in the body.
- * It is equivalent to:
- *
- * <br><code>insertAt(lineNum, true, src)</code>
- *
- * <br>See this method as well.
- *
- * @param lineNum the line number. The bytecode is inserted at the
- * beginning of the code at the line specified by this
- * line number.
- * @param src the source code representing the inserted bytecode.
- * It must be a single statement or block.
- * @return the line number at which the bytecode has been inserted.
- *
- * @see CtBehavior#insertAt(int,boolean,String)
- */
- public int insertAt(int lineNum, String src)
- throws CannotCompileException
- {
- return insertAt(lineNum, true, src);
- }
-
- /**
- * Inserts bytecode at the specified line in the body.
- *
- * <p>If there is not
- * a statement at the specified line, the bytecode might be inserted
- * at the line including the first statement after that line specified.
- * For example, if there is only a closing brace at that line, the
- * bytecode would be inserted at another line below.
- * To know exactly where the bytecode will be inserted, call with
- * <code>modify</code> set to <code>false</code>.
- *
- * @param lineNum the line number. The bytecode is inserted at the
- * beginning of the code at the line specified by this
- * line number.
- * @param modify if false, this method does not insert the bytecode.
- * It instead only returns the line number at which
- * the bytecode would be inserted.
- * @param src the source code representing the inserted bytecode.
- * It must be a single statement or block.
- * If modify is false, the value of src can be null.
- * @return the line number at which the bytecode has been inserted.
- */
- public int insertAt(int lineNum, boolean modify, String src)
- throws CannotCompileException
- {
- CodeAttribute ca = methodInfo.getCodeAttribute();
- if (ca == null)
- throw new CannotCompileException("no method body");
-
- LineNumberAttribute ainfo
- = (LineNumberAttribute)ca.getAttribute(LineNumberAttribute.tag);
- if (ainfo == null)
- throw new CannotCompileException("no line number info");
-
- LineNumberAttribute.Pc pc = ainfo.toNearPc(lineNum);
- lineNum = pc.line;
- int index = pc.index;
- if (!modify)
- return lineNum;
-
- declaringClass.checkModify();
- CodeIterator iterator = ca.iterator();
- Javac jv = new Javac(declaringClass);
- try {
- jv.recordLocalVariables(ca, index);
- jv.recordParams(getParameterTypes(),
- Modifier.isStatic(getModifiers()));
- jv.compileStmnt(src);
- Bytecode b = jv.getBytecode();
- int stack = b.getMaxStack();
- int locals = b.getMaxLocals();
-
- /* We assume that there is no values in the operand stack
- * at the position where the bytecode is inserted.
- */
- if (stack > ca.getMaxStack())
- ca.setMaxStack(stack);
-
- if (locals > ca.getMaxLocals())
- ca.setMaxLocals(locals);
-
- iterator.insert(index, b.get());
- iterator.insert(b.getExceptionTable(), index);
- return lineNum;
- }
- catch (NotFoundException e) {
- throw new CannotCompileException(e);
- }
- catch (CompileError e) {
- throw new CannotCompileException(e);
- }
- catch (BadBytecode e) {
- throw new CannotCompileException(e);
- }
- }
- }
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