Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
DLoadPop2Trimmer |
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| 0.0;0 | ||||
DLoadPop2Trimmer$1 |
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| 0.0;0 | ||||
DLoadPop2Trimmer$LazyHolder |
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| 0.0;0 |
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.automatic.trimming; | |
18 | ||
19 | import org.objectweb.asm.Opcodes; | |
20 | import org.objectweb.asm.tree.AbstractInsnNode; | |
21 | import org.objectweb.asm.tree.InsnList; | |
22 | ||
23 | /** Trimmer removing (DLOAD i, POP2). | |
24 | */ | |
25 | 1 | public class DLoadPop2Trimmer extends BytecodeTrimmer { |
26 | ||
27 | /** Holder for the singleton instance.*/ | |
28 | 65 | private static class LazyHolder { |
29 | /** The singleton instance. */ | |
30 | 1 | private static final BytecodeTrimmer INSTANCE = new DLoadPop2Trimmer(); |
31 | } | |
32 | ||
33 | /** Hidden constructor. | |
34 | */ | |
35 | private DLoadPop2Trimmer() { | |
36 | 1 | super(2); |
37 | 1 | } |
38 | ||
39 | /** Get the singleton instance. | |
40 | * <p>We use here the Initialization on Demand Holder idiom.</p> | |
41 | * @return the singleton instance | |
42 | */ | |
43 | public static BytecodeTrimmer getInstance() { | |
44 | 65 | return LazyHolder.INSTANCE; |
45 | } | |
46 | ||
47 | /** {@inheritDoc} */ | |
48 | @Override | |
49 | protected boolean trimWindow(final InsnList instructions, | |
50 | final AbstractInsnNode[] window) { | |
51 | ||
52 | 1800 | if ((window[0].getOpcode() == Opcodes.DUP2) && |
53 | (window[1].getOpcode() == Opcodes.POP2)) { | |
54 | ||
55 | // remove the no-op instructions pair | |
56 | 0 | instructions.remove(window[0]); |
57 | 0 | instructions.remove(window[1]); |
58 | ||
59 | 0 | return true; |
60 | ||
61 | } | |
62 | ||
63 | // nothing have been done | |
64 | 1800 | return false; |
65 | ||
66 | } | |
67 | ||
68 | } |