1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2015 Eric Lafortune @ GuardSquare
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.optimize.peephole;
import proguard.classfile.constant.Constant;
import proguard.classfile.editor.CodeAttributeEditor;
import proguard.classfile.instruction.Instruction;
import proguard.classfile.instruction.visitor.*;
/**
* This InstructionVisitor replaces multiple instruction sequences at once.
*
* @see InstructionSequenceReplacer
* @author Eric Lafortune
*/
public class InstructionSequencesReplacer
extends MultiInstructionVisitor
implements InstructionVisitor
{
private static final int PATTERN_INDEX = 0;
private static final int REPLACEMENT_INDEX = 1;
/**
* Creates a new InstructionSequencesReplacer.
* @param patternConstants any constants referenced by the pattern
* instruction.
* @param instructionSequences the instruction sequences to be replaced,
* with subsequently the sequence pair index,
* the patten/replacement index (0 or 1),
* and the instruction index in the sequence.
* @param branchTargetFinder a branch target finder that has been
* initialized to indicate branch targets
* in the visited code.
* @param codeAttributeEditor a code editor that can be used for
* accumulating changes to the code.
*/
public InstructionSequencesReplacer(Constant[] patternConstants,
Instruction[][][] instructionSequences,
BranchTargetFinder branchTargetFinder,
CodeAttributeEditor codeAttributeEditor)
{
this(patternConstants,
instructionSequences,
branchTargetFinder,
codeAttributeEditor,
null);
}
/**
* Creates a new InstructionSequenceReplacer.
* @param patternConstants any constants referenced by the pattern
* instruction.
* @param instructionSequences the instruction sequences to be replaced,
* with subsequently the sequence pair index,
* the patten/replacement index (0 or 1),
* and the instruction index in the sequence.
* @param branchTargetFinder a branch target finder that has been
* initialized to indicate branch targets
* in the visited code.
* @param codeAttributeEditor a code editor that can be used for
* accumulating changes to the code.
* @param extraInstructionVisitor an optional extra visitor for all deleted
* load instructions.
*/
public InstructionSequencesReplacer(Constant[] patternConstants,
Instruction[][][] instructionSequences,
BranchTargetFinder branchTargetFinder,
CodeAttributeEditor codeAttributeEditor,
InstructionVisitor extraInstructionVisitor)
{
super(createInstructionSequenceReplacers(patternConstants,
instructionSequences,
branchTargetFinder,
codeAttributeEditor,
extraInstructionVisitor));
}
/**
* Creates an array of InstructionSequenceReplacer instances.
* @param patternConstants any constants referenced by the pattern
* instruction.
* @param instructionSequences the instruction sequences to be replaced,
* with subsequently the sequence pair index,
* the from/to index (0 or 1), and the
* instruction index in the sequence.
* @param branchTargetFinder a branch target finder that has been
* initialized to indicate branch targets
* in the visited code.
* @param codeAttributeEditor a code editor that can be used for
* accumulating changes to the code.
* @param extraInstructionVisitor an optional extra visitor for all deleted
* load instructions.
*/
private static InstructionVisitor[] createInstructionSequenceReplacers(Constant[] patternConstants,
Instruction[][][] instructionSequences,
BranchTargetFinder branchTargetFinder,
CodeAttributeEditor codeAttributeEditor,
InstructionVisitor extraInstructionVisitor)
{
InstructionVisitor[] instructionSequenceReplacers =
new InstructionSequenceReplacer[instructionSequences.length];
for (int index = 0; index < instructionSequenceReplacers.length; index++)
{
Instruction[][] instructionSequencePair = instructionSequences[index];
instructionSequenceReplacers[index] =
new InstructionSequenceReplacer(patternConstants,
instructionSequencePair[PATTERN_INDEX],
instructionSequencePair[REPLACEMENT_INDEX],
branchTargetFinder,
codeAttributeEditor,
extraInstructionVisitor);
}
return instructionSequenceReplacers;
}
}
|