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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/*
* 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.editor;
import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.*;
import proguard.classfile.constant.*;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.util.*;
import proguard.classfile.visitor.*;
/**
* This ConstantVisitor fixes the access modifiers of all classes and class
* members that are referenced by the constants that it visits.
*
* @author Eric Lafortune
*/
public class AccessFixer
extends SimplifiedVisitor
implements ConstantVisitor,
ClassVisitor,
MemberVisitor
{
private MyReferencedClassFinder referencedClassFinder = new MyReferencedClassFinder();
private Clazz referencingClass;
private Clazz referencedClass;
// Implementations for ConstantVisitor.
public void visitAnyConstant(Clazz clazz, Constant constant) {}
public void visitStringConstant(Clazz clazz, StringConstant stringConstant)
{
referencingClass = clazz;
referencedClass = stringConstant.referencedClass;
// Make sure the access flags of the referenced class or class member,
// if any, are acceptable.
stringConstant.referencedClassAccept(this);
stringConstant.referencedMemberAccept(this);
}
public void visitInvokeDynamicConstant(Clazz clazz, InvokeDynamicConstant invokeDynamicConstant)
{
// Check the bootstrap method.
invokeDynamicConstant.bootstrapMethodHandleAccept(clazz, this);
}
public void visitMethodHandleConstant(Clazz clazz, MethodHandleConstant methodHandleConstant)
{
// Check the method reference.
clazz.constantPoolEntryAccept(methodHandleConstant.u2referenceIndex, this);
}
public void visitAnyRefConstant(Clazz clazz, RefConstant refConstant)
{
referencingClass = clazz;
// Remember the specified class, since it might be different from
// the referenced class that actually contains the class member.
clazz.constantPoolEntryAccept(refConstant.u2classIndex, referencedClassFinder);
// Make sure the access flags of the referenced class member are
// acceptable.
refConstant.referencedMemberAccept(this);
}
public void visitClassConstant(Clazz clazz, ClassConstant classConstant)
{
referencingClass = clazz;
// Make sure the access flags of the referenced class are acceptable.
classConstant.referencedClassAccept(this);
}
// Implementations for ClassVisitor.
public void visitLibraryClass(LibraryClass libraryClass) {}
public void visitProgramClass(ProgramClass programClass)
{
int currentAccessFlags = programClass.getAccessFlags();
int currentAccessLevel = AccessUtil.accessLevel(currentAccessFlags);
// Compute the required access level.
Clazz referencingClass = this.referencingClass;
int requiredAccessLevel =
inSamePackage(programClass, referencingClass) ? AccessUtil.PACKAGE_VISIBLE :
AccessUtil.PUBLIC;
// Fix the class access flags if necessary.
if (currentAccessLevel < requiredAccessLevel)
{
programClass.u2accessFlags =
AccessUtil.replaceAccessFlags(currentAccessFlags,
AccessUtil.accessFlags(requiredAccessLevel));
}
}
// Implementations for MemberVisitor.
public void visitLibraryMember(LibraryClass libraryClass, LibraryMember libraryMember) {}
public void visitProgramMember(ProgramClass programClass, ProgramMember programMember)
{
int currentAccessFlags = programMember.getAccessFlags();
int currentAccessLevel = AccessUtil.accessLevel(currentAccessFlags);
// Compute the required access level.
int requiredAccessLevel =
programClass.equals(referencingClass) ? AccessUtil.PRIVATE :
inSamePackage(programClass, referencingClass) ? AccessUtil.PACKAGE_VISIBLE :
referencedClass.extends_(referencingClass) &&
referencingClass.extends_(programClass) ? AccessUtil.PROTECTED :
AccessUtil.PUBLIC;
// Fix the class member access flags if necessary.
if (currentAccessLevel < requiredAccessLevel)
{
programMember.u2accessFlags =
AccessUtil.replaceAccessFlags(currentAccessFlags,
AccessUtil.accessFlags(requiredAccessLevel));
}
}
/**
* This ConstantVisitor returns the referenced class of the class constant
* that it visits.
*/
private class MyReferencedClassFinder
extends SimplifiedVisitor
implements ConstantVisitor
{
// Implementations for ConstantVisitor.
public void visitClassConstant(Clazz clazz, ClassConstant classConstant)
{
referencedClass = classConstant.referencedClass;
}
}
// Small utility methods.
private boolean inSamePackage(ProgramClass class1, Clazz class2)
{
return ClassUtil.internalPackageName(class1.getName()).equals(
ClassUtil.internalPackageName(class2.getName()));
}
}
|
