Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
Dup2X2Transformer |
|
| 2.0;2 |
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.nabla.forward.instructions; | |
18 | ||
19 | import org.apache.commons.nabla.DifferentiationException; | |
20 | import org.apache.commons.nabla.forward.analysis.InstructionsTransformer; | |
21 | import org.apache.commons.nabla.forward.analysis.MethodDifferentiator; | |
22 | import org.objectweb.asm.Opcodes; | |
23 | import org.objectweb.asm.tree.AbstractInsnNode; | |
24 | import org.objectweb.asm.tree.InsnList; | |
25 | import org.objectweb.asm.tree.InsnNode; | |
26 | ||
27 | /** Differentiation transformer for DUP2_X2 instructions. | |
28 | * @version $Id$ | |
29 | */ | |
30 | public class Dup2X2Transformer implements InstructionsTransformer { | |
31 | ||
32 | /** Indicator for top stack element conversion. */ | |
33 | private final boolean stack0Converted; | |
34 | ||
35 | /** Indicator for next to top stack element conversion. */ | |
36 | private final boolean stack1Converted; | |
37 | ||
38 | /** Simple constructor. | |
39 | * @param stack0Converted if true, the top level stack element has already been converted | |
40 | * @param stack1Converted if true, the next to top level stack element has already been converted | |
41 | */ | |
42 | 0 | public Dup2X2Transformer(final boolean stack0Converted, final boolean stack1Converted) { |
43 | 0 | this.stack0Converted = stack0Converted; |
44 | 0 | this.stack1Converted = stack1Converted; |
45 | 0 | } |
46 | ||
47 | /** {@inheritDoc} */ | |
48 | public InsnList getReplacement(final AbstractInsnNode insn, | |
49 | final MethodDifferentiator methodDifferentiator) | |
50 | throws DifferentiationException { | |
51 | ||
52 | 0 | final InsnList list = new InsnList(); |
53 | ||
54 | 0 | if (stack1Converted) { |
55 | 0 | if (stack0Converted) { |
56 | 0 | list.add(new InsnNode(Opcodes.DUP_X1)); |
57 | } else { | |
58 | 0 | list.add(new InsnNode(Opcodes.DUP2_X1)); |
59 | } | |
60 | } else { | |
61 | 0 | list.add(new InsnNode(Opcodes.DUP_X2)); |
62 | } | |
63 | ||
64 | 0 | return list; |
65 | ||
66 | } | |
67 | ||
68 | } |