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
139
140
141
142
143
144
145
146
147
148
149
150
|
/*
* 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.util;
import proguard.classfile.*;
import proguard.classfile.attribute.CodeAttribute;
import proguard.classfile.attribute.annotation.*;
import proguard.classfile.attribute.annotation.visitor.ElementValueVisitor;
import proguard.classfile.attribute.visitor.*;
import proguard.classfile.constant.*;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.instruction.*;
import proguard.classfile.instruction.visitor.*;
import proguard.classfile.visitor.*;
import proguard.util.StringMatcher;
/**
* This ElementValueVisitor initializes the field references of the
* EnumConstantElementValue instances that it visits.
*
* @author Eric Lafortune
*/
public class EnumFieldReferenceInitializer
extends SimplifiedVisitor
implements ElementValueVisitor,
InstructionVisitor,
ConstantVisitor
{
/*
private static boolean DEBUG = true;
/*/
private static final boolean DEBUG = false;
//*/
private MemberVisitor enumFieldFinder = new AllAttributeVisitor(
new AllInstructionVisitor(this));
// Fields acting as parameters and return values for the visitors.
private String enumTypeName;
private String enumConstantName;
private boolean enumConstantNameFound;
private Clazz referencedEnumClass;
private Field referencedEnumField;
// Implementations for ElementValueVisitor.
public void visitAnyElementValue(Clazz clazz, Annotation annotation, ElementValue elementValue) {}
public void visitEnumConstantElementValue(Clazz clazz, Annotation annotation, EnumConstantElementValue enumConstantElementValue)
{
if (enumConstantElementValue.referencedClasses != null &&
enumConstantElementValue.referencedClasses.length > 0)
{
referencedEnumClass = enumConstantElementValue.referencedClasses[0];
if (referencedEnumClass != null)
{
// Try to find the enum field through the static enum
// initialization code (at least for program classes).
enumTypeName = enumConstantElementValue.getTypeName(clazz);
enumConstantName = enumConstantElementValue.getConstantName(clazz);
referencedEnumField = null;
referencedEnumClass.methodAccept(ClassConstants.INTERNAL_METHOD_NAME_CLINIT,
ClassConstants.INTERNAL_METHOD_TYPE_CLINIT,
enumFieldFinder);
// Otherwise try to find the enum field through its name.
// The constant name could be different from the field name, if
// the latter is already obfuscated.
if (referencedEnumField == null)
{
referencedEnumField =
referencedEnumClass.findField(enumConstantName,
enumTypeName);
}
if (DEBUG)
{
System.out.println("EnumFieldReferenceInitializer: ["+referencedEnumClass.getName()+"."+enumConstantName+"] -> "+referencedEnumField);
}
enumConstantElementValue.referencedField = referencedEnumField;
}
}
}
// Implementations for InstructionVisitor.
public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) {}
public void visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction)
{
switch (constantInstruction.opcode)
{
case InstructionConstants.OP_LDC:
case InstructionConstants.OP_LDC_W:
case InstructionConstants.OP_PUTSTATIC:
clazz.constantPoolEntryAccept(constantInstruction.constantIndex, this);
break;
}
}
// Implementations for ConstantVisitor.
public void visitAnyConstant(Clazz clazz, Constant constant) {}
public void visitStringConstant(Clazz clazz, StringConstant stringConstant)
{
enumConstantNameFound =
enumConstantName.equals(stringConstant.getString(clazz));
}
public void visitFieldrefConstant(Clazz clazz, FieldrefConstant fieldrefConstant)
{
if (enumConstantNameFound)
{
if (enumTypeName.equals(fieldrefConstant.getType(clazz)))
{
referencedEnumField = (Field)fieldrefConstant.referencedMember;
}
enumConstantNameFound = false;
}
}
}
|
