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
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2014 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.constant.*;
import proguard.classfile.util.*;
import proguard.classfile.visitor.*;
/**
* This ClassVisitor fixes the access modifiers of all classes and class
* members that are referenced by the classes that it visits.
*
* @author Eric Lafortune
*/
public class AccessFixer
extends ReferencedClassVisitor
implements ClassVisitor
{
/**
* Creates a new AccessFixer.
*/
public AccessFixer()
{
// Unfortunately, the inner class must be static to be passed to the
// super constructor. We therefore can't let it refer to this class;
// we'll let this class refer to the inner class instead.
super(new MyAccessFixer());
}
// Overridden methods for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
// Remember the referencing class.
((MyAccessFixer)classVisitor).referencingClass = programClass;
// Start visiting and fixing the referenced classes and class members.
super.visitProgramClass(programClass);
}
public void visitLibraryClass(LibraryClass libraryClass)
{
// Remember the referencing class.
((MyAccessFixer)classVisitor).referencingClass = libraryClass;
// Start visiting and fixing the referenced classes and class members.
super.visitLibraryClass(libraryClass);
}
// Overridden methods for MemberVisitor.
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
// Fix the referenced classes and class members.
super.visitProgramMember(programClass, programMethod);
// Fix overridden or implemented methods higher up the hierarchy.
// We can ignore private and static methods and initializers.
if ((programMethod.getAccessFlags() & (ClassConstants.ACC_PRIVATE |
ClassConstants.ACC_STATIC)) == 0 &&
!ClassUtil.isInitializer(programMethod.getName(programClass)))
{
programClass.hierarchyAccept(false, true, false, false,
new NamedMethodVisitor(programMethod.getName(programClass),
programMethod.getDescriptor(programClass),
new MemberAccessFilter(0, ClassConstants.ACC_PRIVATE |
ClassConstants.ACC_STATIC,
(MemberVisitor)classVisitor)));
}
}
public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
{
// Fix the referenced classes and class members.
super.visitLibraryMember(libraryClass, libraryMethod);
// Fix overridden or implemented methods higher up the hierarchy.
// We can ignore private and static methods and initializers.
if ((libraryMethod.getAccessFlags() & (ClassConstants.ACC_PRIVATE |
ClassConstants.ACC_STATIC)) == 0 &&
!ClassUtil.isInitializer(libraryMethod.getName(libraryClass)))
{
libraryClass.hierarchyAccept(false, true, false, false,
new NamedMethodVisitor(libraryMethod.getName(libraryClass),
libraryMethod.getDescriptor(libraryClass),
new MemberAccessFilter(0, ClassConstants.ACC_PRIVATE |
ClassConstants.ACC_STATIC,
(MemberVisitor)classVisitor)));
}
}
// Overridden methods for ConstantVisitor.
public void visitStringConstant(Clazz clazz, StringConstant stringConstant)
{
// Fix the access flags of the referenced class, if any.
super.visitStringConstant(clazz, stringConstant);
// Fix the access flags of the referenced class member, if any.
stringConstant.referencedMemberAccept((MemberVisitor)classVisitor);
}
public void visitAnyRefConstant(Clazz clazz, RefConstant refConstant)
{
// Fix the access flags of the referenced class.
super.visitAnyRefConstant(clazz, refConstant);
// Fix the access flags of the referenced class member.
refConstant.referencedMemberAccept((MemberVisitor)classVisitor);
}
/**
* This ClassVisitor and MemberVisitor fixes the access flags of the
* classes and class members that it visits, relative to the referencing
* class.
*/
private static class MyAccessFixer
extends SimplifiedVisitor
implements ClassVisitor,
MemberVisitor
{
private Clazz referencingClass;
// 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.
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 :
programClass.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));
}
}
// Small utility methods.
/**
* Returns whether the two given classes are in the same package.
*/
private boolean inSamePackage(ProgramClass class1, Clazz class2)
{
return ClassUtil.internalPackageName(class1.getName()).equals(
ClassUtil.internalPackageName(class2.getName()));
}
}
}
|
