1/* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu) 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the Free 9 * Software Foundation; either version 2 of the License, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, write to the Free Software Foundation, Inc., 19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21package proguard.classfile.editor; 22 23import proguard.classfile.*; 24import proguard.classfile.attribute.*; 25import proguard.classfile.instruction.visitor.InstructionVisitor; 26import proguard.classfile.instruction.*; 27import proguard.classfile.util.SimplifiedVisitor; 28 29/** 30 * This InstructionVisitor adds all instructions that it visits to the given 31 * target code attribute. 32 * 33 * @author Eric Lafortune 34 */ 35public class InstructionAdder 36extends SimplifiedVisitor 37implements InstructionVisitor 38{ 39 private final ConstantAdder constantAdder; 40 private final CodeAttributeComposer codeAttributeComposer; 41 42 43 /** 44 * Creates a new InstructionAdder that will copy classes into the given 45 * target code attribute. 46 */ 47 public InstructionAdder(ProgramClass targetClass, 48 CodeAttributeComposer targetComposer) 49 { 50 constantAdder = new ConstantAdder(targetClass); 51 codeAttributeComposer = targetComposer; 52 } 53 54 55 // Implementations for InstructionVisitor. 56 57 58 public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) 59 { 60 // Add the instruction. 61 codeAttributeComposer.appendInstruction(offset, instruction); 62 } 63 64 65 public void visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction) 66 { 67 // Create a copy of the instruction. 68 Instruction newConstantInstruction = 69 new ConstantInstruction(constantInstruction.opcode, 70 constantAdder.addConstant(clazz, constantInstruction.constantIndex), 71 constantInstruction.constant).shrink(); 72 73 // Add the instruction. 74 codeAttributeComposer.appendInstruction(offset, newConstantInstruction); 75 } 76}