Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
DcmpTransformer |
|
| 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.Type; | |
24 | import org.objectweb.asm.tree.AbstractInsnNode; | |
25 | import org.objectweb.asm.tree.InsnList; | |
26 | import org.objectweb.asm.tree.InsnNode; | |
27 | import org.objectweb.asm.tree.MethodInsnNode; | |
28 | ||
29 | /** Differentiation transformer for DCMPx instructions. | |
30 | * @version $Id$ | |
31 | */ | |
32 | public class DcmpTransformer implements InstructionsTransformer { | |
33 | ||
34 | /** Name of the {@link org.apache.commons.math3.analysis.differentiation.DerivativeStructure} method corresponding to the value getter. */ | |
35 | private static final String VALUE_GETTER_METHOD = "getValue"; | |
36 | ||
37 | /** Indicator for top stack element conversion. */ | |
38 | private final boolean stack0Converted; | |
39 | ||
40 | /** Indicator for next to top stack element conversion. */ | |
41 | private final boolean stack1Converted; | |
42 | ||
43 | /** Simple constructor. | |
44 | * @param stack0Converted if true, the top level stack element has already been converted | |
45 | * @param stack1Converted if true, the next to top level stack element has already been converted | |
46 | */ | |
47 | 0 | public DcmpTransformer(final boolean stack0Converted, final boolean stack1Converted) { |
48 | 0 | this.stack0Converted = stack0Converted; |
49 | 0 | this.stack1Converted = stack1Converted; |
50 | 0 | } |
51 | ||
52 | /** {@inheritDoc} */ | |
53 | public InsnList getReplacement(final AbstractInsnNode insn, | |
54 | final MethodDifferentiator methodDifferentiator) | |
55 | throws DifferentiationException { | |
56 | 0 | final InsnList list = new InsnList(); |
57 | ||
58 | 0 | if (stack1Converted) { |
59 | 0 | if (stack0Converted) { |
60 | // operand stack initial state: ds_a, ds_b | |
61 | 0 | list.add(new InsnNode(Opcodes.SWAP)); // => ds_b, ds_a |
62 | 0 | list.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, DS_TYPE.getInternalName(), |
63 | VALUE_GETTER_METHOD, | |
64 | Type.getMethodDescriptor(Type.DOUBLE_TYPE))); // => ds_b, a0 | |
65 | 0 | list.add(new InsnNode(Opcodes.DUP2_X2)); // => a0, ds_b, a0 |
66 | 0 | list.add(new InsnNode(Opcodes.POP2)); // => a0, ds_b |
67 | 0 | list.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, DS_TYPE.getInternalName(), |
68 | VALUE_GETTER_METHOD, | |
69 | Type.getMethodDescriptor(Type.DOUBLE_TYPE))); // => a0, b0 | |
70 | } else { | |
71 | // operand stack initial state: ds_a, b0 | |
72 | 0 | list.add(new InsnNode(Opcodes.DUP2_X2)); // => b0, ds_a, b0 |
73 | 0 | list.add(new InsnNode(Opcodes.POP2)); // => b0, ds_a |
74 | 0 | list.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, DS_TYPE.getInternalName(), |
75 | VALUE_GETTER_METHOD, | |
76 | Type.getMethodDescriptor(Type.DOUBLE_TYPE))); // => b0, a0 | |
77 | 0 | list.add(new InsnNode(Opcodes.DUP2_X2)); // => a0, b0, a0 |
78 | 0 | list.add(new InsnNode(Opcodes.POP2)); // => a0, b0 |
79 | } | |
80 | } else { | |
81 | // operand stack initial state: a, ds_b | |
82 | 0 | list.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, DS_TYPE.getInternalName(), |
83 | VALUE_GETTER_METHOD, | |
84 | Type.getMethodDescriptor(Type.DOUBLE_TYPE))); // => a0, b0 | |
85 | } | |
86 | ||
87 | 0 | list.add(new InsnNode(insn.getOpcode())); // => bool |
88 | ||
89 | 0 | return list; |
90 | ||
91 | } | |
92 | ||
93 | } |