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.pack200.Pack200Exception;
20 import org.apache.commons.compress.harmony.unpack200.SegmentConstantPool;
21 import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode;
22 import org.apache.commons.compress.harmony.unpack200.bytecode.CPClass;
23 import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry;
24 import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
25
26 /**
27 * This class is an extension of the ClassRefForm. It has two purposes: 1. To keep track of the last type used in a new() instruction in the current class. 2.
28 * To allow the sender to create instances of either a specified class (which then becomes the new class) or the last used new class.
29 */
30 public class NewClassRefForm extends ClassRefForm {
31
32 public NewClassRefForm(final int opcode, final String name, final int[] rewrite) {
33 super(opcode, name, rewrite);
34 }
35
36 /*
37 * (non-Javadoc)
38 *
39 * @see org.apache.commons.compress.harmony.unpack200.bytecode.forms.ReferenceForm#setByteCodeOperands(org.apache.commons
40 * .compress.harmony.unpack200.bytecode.ByteCode, org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager)
41 */
42 @Override
43 public void setByteCodeOperands(final ByteCode byteCode, final OperandManager operandManager, final int codeLength) {
44 final int offset = getOffset(operandManager);
45 if (offset == 0) {
46 // Use current class
47 final SegmentConstantPool globalPool = operandManager.globalConstantPool();
48 final ClassFileEntry[] nested = { globalPool.getClassPoolEntry(operandManager.getCurrentClass()) };
49 byteCode.setNested(nested);
50 byteCode.setNestedPositions(new int[][] { { 0, 2 } });
51 } else {
52 // Look up the class in the classpool
53 try {
54 // Parent takes care of subtracting one from offset
55 // to adjust for 1-based global pool
56 setNestedEntries(byteCode, operandManager, offset);
57 } catch (final Pack200Exception ex) {
58 throw new Error("Got a pack200 exception. What to do?");
59 }
60 }
61 operandManager.setNewClass(((CPClass) byteCode.getNestedClassFileEntries()[0]).getName());
62 }
63 }