001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * https://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.commons.compress.harmony.unpack200.bytecode.forms; 020 021import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode; 022import org.apache.commons.compress.harmony.unpack200.bytecode.CodeAttribute; 023 024/** 025 * Switch instruction form. 026 */ 027public abstract class SwitchForm extends VariableInstructionForm { 028 029 /** 030 * Constructs a new instance with the specified opcode, name, operandType and rewrite. 031 * 032 * @param opcode index corresponding to the opcode's value. 033 * @param name String printable name of the opcode. 034 */ 035 public SwitchForm(final int opcode, final String name) { 036 super(opcode, name); 037 } 038 039 /* 040 * (non-Javadoc) 041 * 042 * @see org.apache.commons.compress.harmony.unpack200.bytecode.forms.ByteCodeForm#fixUpByteCodeTargets(org.apache.commons 043 * .compress.harmony.unpack200.bytecode.ByteCode, org.apache.commons.compress.harmony.unpack200.bytecode.CodeAttribute) 044 */ 045 @Override 046 public void fixUpByteCodeTargets(final ByteCode byteCode, final CodeAttribute codeAttribute) { 047 // SwitchForms need to fix up the target of label operations 048 final int[] originalTargets = byteCode.getByteCodeTargets(); 049 final int numberOfLabels = originalTargets.length; 050 final int[] replacementTargets = new int[numberOfLabels]; 051 052 final int sourceIndex = byteCode.getByteCodeIndex(); 053 final int sourceValue = codeAttribute.byteCodeOffsets.get(sourceIndex).intValue(); 054 for (int index = 0; index < numberOfLabels; index++) { 055 final int absoluteInstructionTargetIndex = sourceIndex + originalTargets[index]; 056 final int targetValue = codeAttribute.byteCodeOffsets.get(absoluteInstructionTargetIndex).intValue(); 057 replacementTargets[index] = targetValue - sourceValue; 058 } 059 final int[] rewriteArray = byteCode.getRewrite(); 060 for (int index = 0; index < numberOfLabels; index++) { 061 setRewrite4Bytes(replacementTargets[index], rewriteArray); 062 } 063 } 064 065}