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
|
/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu)
*
* 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.classfile.instruction;
import proguard.classfile.*;
import proguard.classfile.attribute.CodeAttribute;
import proguard.classfile.instruction.visitor.InstructionVisitor;
/**
* This Instruction represents a simple instruction without variable arguments
* or constant pool references.
*
* @author Eric Lafortune
*/
public class LookUpSwitchInstruction extends SwitchInstruction
{
public int[] cases;
/**
* Creates an uninitialized LookUpSwitchInstruction.
*/
public LookUpSwitchInstruction() {}
/**
* Creates a new LookUpSwitchInstruction with the given arguments.
*/
public LookUpSwitchInstruction(byte opcode,
int defaultOffset,
int[] cases,
int[] jumpOffsets)
{
this.opcode = opcode;
this.defaultOffset = defaultOffset;
this.cases = cases;
this.jumpOffsets = jumpOffsets;
}
/**
* Copies the given instruction into this instruction.
* @param lookUpSwitchInstruction the instruction to be copied.
* @return this instruction.
*/
public LookUpSwitchInstruction copy(LookUpSwitchInstruction lookUpSwitchInstruction)
{
this.opcode = lookUpSwitchInstruction.opcode;
this.defaultOffset = lookUpSwitchInstruction.defaultOffset;
this.cases = lookUpSwitchInstruction.cases;
this.jumpOffsets = lookUpSwitchInstruction.jumpOffsets;
return this;
}
// Implementations for Instruction.
public Instruction shrink()
{
// There aren't any ways to shrink this instruction.
return this;
}
protected void readInfo(byte[] code, int offset)
{
// Skip up to three padding bytes.
offset += -offset & 3;
// Read the two 32-bit arguments.
defaultOffset = readInt(code, offset); offset += 4;
int jumpOffsetCount = readInt(code, offset); offset += 4;
// Read the matches-offset pairs.
cases = new int[jumpOffsetCount];
jumpOffsets = new int[jumpOffsetCount];
for (int index = 0; index < jumpOffsetCount; index++)
{
cases[index] = readInt(code, offset); offset += 4;
jumpOffsets[index] = readInt(code, offset); offset += 4;
}
}
protected void writeInfo(byte[] code, int offset)
{
// Write up to three padding bytes.
while ((offset & 3) != 0)
{
writeByte(code, offset++, 0);
}
// Write the two 32-bit arguments.
writeInt(code, offset, defaultOffset); offset += 4;
writeInt(code, offset, cases.length); offset += 4;
// Write the matches-offset pairs.
for (int index = 0; index < cases.length; index++)
{
writeInt(code, offset, cases[index]); offset += 4;
writeInt(code, offset, jumpOffsets[index]); offset += 4;
}
}
public int length(int offset)
{
return 1 + (-(offset+1) & 3) + 8 + cases.length * 8;
}
public void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, InstructionVisitor instructionVisitor)
{
instructionVisitor.visitLookUpSwitchInstruction(clazz, method, codeAttribute, offset, this);
}
}
|
