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 org.apache.commons.compress.harmony.unpack200.bytecode.forms.ByteCodeForm#fixUpByteCodeTargets(org.apache.commons
032     * .compress.harmony.unpack200.bytecode.ByteCode, org.apache.commons.compress.harmony.unpack200.bytecode.CodeAttribute)
033     */
034    @Override
035    public void fixUpByteCodeTargets(final ByteCode byteCode, final CodeAttribute codeAttribute) {
036        // SwitchForms need to fix up the target of label operations
037        final int[] originalTargets = byteCode.getByteCodeTargets();
038        final int numberOfLabels = originalTargets.length;
039        final int[] replacementTargets = new int[numberOfLabels];
040
041        final int sourceIndex = byteCode.getByteCodeIndex();
042        final int sourceValue = codeAttribute.byteCodeOffsets.get(sourceIndex).intValue();
043        for (int index = 0; index < numberOfLabels; index++) {
044            final int absoluteInstructionTargetIndex = sourceIndex + originalTargets[index];
045            final int targetValue = codeAttribute.byteCodeOffsets.get(absoluteInstructionTargetIndex).intValue();
046            replacementTargets[index] = targetValue - sourceValue;
047        }
048        final int[] rewriteArray = byteCode.getRewrite();
049        for (int index = 0; index < numberOfLabels; index++) {
050            setRewrite4Bytes(replacementTargets[index], rewriteArray);
051        }
052    }
053
054}