1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.compress.harmony.unpack200.bytecode.forms;
18
19 import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode;
20 import org.apache.commons.compress.harmony.unpack200.bytecode.CodeAttribute;
21
22 public abstract class SwitchForm extends VariableInstructionForm {
23
24 public SwitchForm(final int opcode, final String name) {
25 super(opcode, name);
26 }
27
28 /*
29 * (non-Javadoc)
30 *
31 * @see org.apache.commons.compress.harmony.unpack200.bytecode.forms.ByteCodeForm#fixUpByteCodeTargets(org.apache.commons
32 * .compress.harmony.unpack200.bytecode.ByteCode, org.apache.commons.compress.harmony.unpack200.bytecode.CodeAttribute)
33 */
34 @Override
35 public void fixUpByteCodeTargets(final ByteCode byteCode, final CodeAttribute codeAttribute) {
36 // SwitchForms need to fix up the target of label operations
37 final int[] originalTargets = byteCode.getByteCodeTargets();
38 final int numberOfLabels = originalTargets.length;
39 final int[] replacementTargets = new int[numberOfLabels];
40
41 final int sourceIndex = byteCode.getByteCodeIndex();
42 final int sourceValue = codeAttribute.byteCodeOffsets.get(sourceIndex).intValue();
43 for (int index = 0; index < numberOfLabels; index++) {
44 final int absoluteInstructionTargetIndex = sourceIndex + originalTargets[index];
45 final int targetValue = codeAttribute.byteCodeOffsets.get(absoluteInstructionTargetIndex).intValue();
46 replacementTargets[index] = targetValue - sourceValue;
47 }
48 final int[] rewriteArray = byteCode.getRewrite();
49 for (int index = 0; index < numberOfLabels; index++) {
50 setRewrite4Bytes(replacementTargets[index], rewriteArray);
51 }
52 }
53
54 }