Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
DReturnTransformer |
|
| 1.5;1.5 |
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 DRETURN instructions. | |
28 | * <p>DRETURN instructions are replaced by ARETURN instructions | |
29 | * as a reference to a {@link | |
30 | * org.apache.commons.math3.analysis.differentiation.DerivativeStructure} | |
31 | * instance uses only one stack slot instead of two.</p> | |
32 | * @version $Id$ | |
33 | */ | |
34 | public class DReturnTransformer implements InstructionsTransformer { | |
35 | ||
36 | /** Indicator for top stack element conversion. */ | |
37 | private final boolean stack0Converted; | |
38 | ||
39 | /** Simple constructor. | |
40 | * @param stack0Converted if true, the top level stack element has already been converted | |
41 | */ | |
42 | 67 | public DReturnTransformer(final boolean stack0Converted) { |
43 | 67 | this.stack0Converted = stack0Converted; |
44 | 67 | } |
45 | ||
46 | /** {@inheritDoc} */ | |
47 | public InsnList getReplacement(final AbstractInsnNode insn, | |
48 | final MethodDifferentiator methodDifferentiator) | |
49 | throws DifferentiationException { | |
50 | ||
51 | 67 | final InsnList list = new InsnList(); |
52 | ||
53 | 67 | if (!stack0Converted) { |
54 | // add conversion for top level stack element | |
55 | 1 | list.add(methodDifferentiator.doubleToDerivativeStructureConversion()); |
56 | } | |
57 | ||
58 | // add the return instruction for a reference type | |
59 | 67 | list.add(new InsnNode(Opcodes.ARETURN)); |
60 | ||
61 | 67 | return list; |
62 | ||
63 | } | |
64 | ||
65 | } |