169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal/* 269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Javassist, a Java-bytecode translator toolkit. 369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Copyright (C) 1999-2007 Shigeru Chiba. All Rights Reserved. 469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * The contents of this file are subject to the Mozilla Public License Version 669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 1.1 (the "License"); you may not use this file except in compliance with 769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * the License. Alternatively, the contents of this file may be used under 869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * the terms of the GNU Lesser General Public License Version 2.1 or later. 969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 1069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Software distributed under the License is distributed on an "AS IS" basis, 1169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 1269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * for the specific language governing rights and limitations under the 1369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * License. 1469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 1569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 1669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalpackage javassist.expr; 1769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 1869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalimport javassist.*; 1969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalimport javassist.bytecode.*; 2069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalimport javassist.compiler.*; 2169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 2269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal/** 2369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * A <code>catch</code> clause or a <code>finally</code> block. 2469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 2569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigalpublic class Handler extends Expr { 2669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal private static String EXCEPTION_NAME = "$1"; 2769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal private ExceptionTable etable; 2869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal private int index; 2969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 3069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 3169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Undocumented constructor. Do not use; internal-use only. 3269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 3369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal protected Handler(ExceptionTable et, int nth, 3469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal CodeIterator it, CtClass declaring, MethodInfo m) { 3569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal super(et.handlerPc(nth), it, declaring, m); 3669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal etable = et; 3769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal index = nth; 3869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 3969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 4069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 4169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Returns the method or constructor containing the catch clause. 4269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 4369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public CtBehavior where() { return super.where(); } 4469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 4569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 4669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Returns the source line number of the catch clause. 4769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 4869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * @return -1 if this information is not available. 4969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 5069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public int getLineNumber() { 5169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return super.getLineNumber(); 5269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 5369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 5469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 5569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Returns the source file containing the catch clause. 5669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 5769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * @return null if this information is not available. 5869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 5969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public String getFileName() { 6069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return super.getFileName(); 6169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 6269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 6369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 6469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Returns the list of exceptions that the catch clause may throw. 6569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 6669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public CtClass[] mayThrow() { 6769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return super.mayThrow(); 6869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 6969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 7069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 7169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Returns the type handled by the catch clause. 7269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * If this is a <code>finally</code> block, <code>null</code> is returned. 7369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 7469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public CtClass getType() throws NotFoundException { 7569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal int type = etable.catchType(index); 7669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal if (type == 0) 7769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return null; 7869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal else { 7969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal ConstPool cp = getConstPool(); 8069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal String name = cp.getClassInfo(type); 8169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return thisClass.getClassPool().getCtClass(name); 8269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 8369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 8469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 8569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 8669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Returns true if this is a <code>finally</code> block. 8769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 8869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public boolean isFinally() { 8969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal return etable.catchType(index) == 0; 9069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 9169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 9269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 9369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * This method has not been implemented yet. 9469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 9569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * @param statement a Java statement except try-catch. 9669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 9769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public void replace(String statement) throws CannotCompileException { 9869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal throw new RuntimeException("not implemented yet"); 9969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 10069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 10169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal /** 10269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * Inserts bytecode at the beginning of the catch clause. 10369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * The caught exception is stored in <code>$1</code>. 10469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * 10569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * @param src the source code representing the inserted bytecode. 10669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal * It must be a single statement or block. 10769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal */ 10869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal public void insertBefore(String src) throws CannotCompileException { 10969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal edited = true; 11069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 11169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal ConstPool cp = getConstPool(); 11269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal CodeAttribute ca = iterator.get(); 11369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal Javac jv = new Javac(thisClass); 11469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal Bytecode b = jv.getBytecode(); 11569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal b.setStackDepth(1); 11669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal b.setMaxLocals(ca.getMaxLocals()); 11769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 11869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal try { 11969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal CtClass type = getType(); 12069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal int var = jv.recordVariable(type, EXCEPTION_NAME); 12169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal jv.recordReturnType(type, false); 12269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal b.addAstore(var); 12369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal jv.compileStmnt(src); 12469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal b.addAload(var); 12569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 12669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal int oldHandler = etable.handlerPc(index); 12769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal b.addOpcode(Opcode.GOTO); 12869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal b.addIndex(oldHandler - iterator.getCodeLength() 12969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal - b.currentPc() + 1); 13069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 13169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal maxStack = b.getMaxStack(); 13269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal maxLocals = b.getMaxLocals(); 13369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal 13469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal int pos = iterator.append(b.get()); 13569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal iterator.append(b.getExceptionTable(), pos); 13669e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal etable.setHandlerPc(index, pos); 13769e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 13869e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal catch (NotFoundException e) { 13969e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal throw new CannotCompileException(e); 14069e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 14169e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal catch (CompileError e) { 14269e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal throw new CannotCompileException(e); 14369e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 14469e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal } 14569e17611504376e4d4603925f8528dfc890fd2c6Luis Sigal} 146