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