ChangedCodePrinter.java revision b72c5c2e5482cf10117b2b25f642f7616b2326c3 
1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu)
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21package proguard.optimize;
22
23import proguard.classfile.*;
24import proguard.classfile.attribute.*;
25import proguard.classfile.attribute.annotation.*;
26import proguard.classfile.attribute.preverification.*;
27import proguard.classfile.attribute.visitor.AttributeVisitor;
28import proguard.classfile.util.ClassUtil;
29
30/**
31 * This AttributeVisitor delegates its call to another AttributeVisitor, and
32 * prints out the code if the other visitor has changed it.
33 *
34 * @author Eric Lafortune
35 */
36public class ChangedCodePrinter
37implements   AttributeVisitor
38{
39    private final AttributeVisitor attributeVisitor;
40
41
42    public ChangedCodePrinter(AttributeVisitor attributeVisitor)
43    {
44        this.attributeVisitor = attributeVisitor;
45    }
46
47
48    // Implementations for AttributeVisitor.
49
50
51    public void visitUnknownAttribute(Clazz clazz, UnknownAttribute unknownAttribute)
52    {
53        attributeVisitor.visitUnknownAttribute(clazz, unknownAttribute);
54    }
55
56
57    public void visitSourceFileAttribute(Clazz clazz, SourceFileAttribute sourceFileAttribute)
58    {
59        attributeVisitor.visitSourceFileAttribute(clazz, sourceFileAttribute);
60    }
61
62
63    public void visitSourceDirAttribute(Clazz clazz, SourceDirAttribute sourceDirAttribute)
64    {
65        attributeVisitor.visitSourceDirAttribute(clazz, sourceDirAttribute);
66    }
67
68
69    public void visitInnerClassesAttribute(Clazz clazz, InnerClassesAttribute innerClassesAttribute)
70    {
71        attributeVisitor.visitInnerClassesAttribute(clazz, innerClassesAttribute);
72    }
73
74
75    public void visitEnclosingMethodAttribute(Clazz clazz, EnclosingMethodAttribute enclosingMethodAttribute)
76    {
77        attributeVisitor.visitEnclosingMethodAttribute(clazz, enclosingMethodAttribute);
78    }
79
80
81    public void visitDeprecatedAttribute(Clazz clazz, DeprecatedAttribute deprecatedAttribute)
82    {
83        attributeVisitor.visitDeprecatedAttribute(clazz, deprecatedAttribute);
84    }
85
86
87    public void visitSyntheticAttribute(Clazz clazz, SyntheticAttribute syntheticAttribute)
88    {
89        attributeVisitor.visitSyntheticAttribute(clazz, syntheticAttribute);
90    }
91
92
93    public void visitSignatureAttribute(Clazz clazz, SignatureAttribute syntheticAttribute)
94    {
95        attributeVisitor.visitSignatureAttribute(clazz, syntheticAttribute);
96    }
97
98
99    public void visitDeprecatedAttribute(Clazz clazz, Field field, DeprecatedAttribute deprecatedAttribute)
100    {
101        attributeVisitor.visitDeprecatedAttribute(clazz, field, deprecatedAttribute);
102    }
103
104
105    public void visitSyntheticAttribute(Clazz clazz, Field field, SyntheticAttribute syntheticAttribute)
106    {
107        attributeVisitor.visitSyntheticAttribute(clazz, field, syntheticAttribute);
108    }
109
110
111    public void visitSignatureAttribute(Clazz clazz, Field field, SignatureAttribute syntheticAttribute)
112    {
113        attributeVisitor.visitSignatureAttribute(clazz, field, syntheticAttribute);
114    }
115
116
117    public void visitDeprecatedAttribute(Clazz clazz, Method method, DeprecatedAttribute deprecatedAttribute)
118    {
119        attributeVisitor.visitDeprecatedAttribute(clazz, method, deprecatedAttribute);
120    }
121
122
123    public void visitSyntheticAttribute(Clazz clazz, Method method, SyntheticAttribute syntheticAttribute)
124    {
125        attributeVisitor.visitSyntheticAttribute(clazz, method, syntheticAttribute);
126    }
127
128
129    public void visitSignatureAttribute(Clazz clazz, Method method, SignatureAttribute syntheticAttribute)
130    {
131        attributeVisitor.visitSignatureAttribute(clazz, method, syntheticAttribute);
132    }
133
134
135    public void visitConstantValueAttribute(Clazz clazz, Field field, ConstantValueAttribute constantValueAttribute)
136    {
137        attributeVisitor.visitConstantValueAttribute(clazz, field, constantValueAttribute);
138    }
139
140
141    public void visitExceptionsAttribute(Clazz clazz, Method method, ExceptionsAttribute exceptionsAttribute)
142    {
143        attributeVisitor.visitExceptionsAttribute(clazz, method, exceptionsAttribute);
144    }
145
146
147    public void visitStackMapAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, StackMapAttribute stackMapAttribute)
148    {
149        attributeVisitor.visitStackMapAttribute(clazz, method, codeAttribute, stackMapAttribute);
150    }
151
152
153    public void visitStackMapTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, StackMapTableAttribute stackMapTableAttribute)
154    {
155        attributeVisitor.visitStackMapTableAttribute(clazz, method, codeAttribute, stackMapTableAttribute);
156    }
157
158
159    public void visitLineNumberTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LineNumberTableAttribute lineNumberTableAttribute)
160    {
161        attributeVisitor.visitLineNumberTableAttribute(clazz, method, codeAttribute, lineNumberTableAttribute);
162    }
163
164
165    public void visitLocalVariableTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTableAttribute localVariableTableAttribute)
166    {
167        attributeVisitor.visitLocalVariableTableAttribute(clazz, method, codeAttribute, localVariableTableAttribute);
168    }
169
170
171    public void visitLocalVariableTypeTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTypeTableAttribute localVariableTypeTableAttribute)
172    {
173        attributeVisitor.visitLocalVariableTypeTableAttribute(clazz, method, codeAttribute, localVariableTypeTableAttribute);
174    }
175
176
177    public void visitRuntimeVisibleAnnotationsAttribute(Clazz clazz, RuntimeVisibleAnnotationsAttribute runtimeVisibleAnnotationsAttribute)
178    {
179        attributeVisitor.visitRuntimeVisibleAnnotationsAttribute(clazz, runtimeVisibleAnnotationsAttribute);
180    }
181
182
183    public void visitRuntimeInvisibleAnnotationsAttribute(Clazz clazz, RuntimeInvisibleAnnotationsAttribute runtimeInvisibleAnnotationsAttribute)
184    {
185        attributeVisitor.visitRuntimeInvisibleAnnotationsAttribute(clazz, runtimeInvisibleAnnotationsAttribute);
186    }
187
188
189    public void visitRuntimeVisibleAnnotationsAttribute(Clazz clazz, Field field, RuntimeVisibleAnnotationsAttribute runtimeVisibleAnnotationsAttribute)
190    {
191        attributeVisitor.visitRuntimeVisibleAnnotationsAttribute(clazz, field, runtimeVisibleAnnotationsAttribute);
192    }
193
194
195    public void visitRuntimeInvisibleAnnotationsAttribute(Clazz clazz, Field field, RuntimeInvisibleAnnotationsAttribute runtimeInvisibleAnnotationsAttribute)
196    {
197        attributeVisitor.visitRuntimeInvisibleAnnotationsAttribute(clazz, field, runtimeInvisibleAnnotationsAttribute);
198    }
199
200
201    public void visitRuntimeVisibleAnnotationsAttribute(Clazz clazz, Method method, RuntimeVisibleAnnotationsAttribute runtimeVisibleAnnotationsAttribute)
202    {
203        attributeVisitor.visitRuntimeVisibleAnnotationsAttribute(clazz, method, runtimeVisibleAnnotationsAttribute);
204    }
205
206
207    public void visitRuntimeInvisibleAnnotationsAttribute(Clazz clazz, Method method, RuntimeInvisibleAnnotationsAttribute runtimeInvisibleAnnotationsAttribute)
208    {
209        attributeVisitor.visitRuntimeInvisibleAnnotationsAttribute(clazz, method, runtimeInvisibleAnnotationsAttribute);
210    }
211
212
213    public void visitRuntimeVisibleParameterAnnotationsAttribute(Clazz clazz, Method method, RuntimeVisibleParameterAnnotationsAttribute runtimeVisibleParameterAnnotationsAttribute)
214    {
215        attributeVisitor.visitRuntimeVisibleParameterAnnotationsAttribute(clazz, method, runtimeVisibleParameterAnnotationsAttribute);
216    }
217
218
219    public void visitRuntimeInvisibleParameterAnnotationsAttribute(Clazz clazz, Method method, RuntimeInvisibleParameterAnnotationsAttribute runtimeInvisibleParameterAnnotationsAttribute)
220    {
221        attributeVisitor.visitRuntimeInvisibleParameterAnnotationsAttribute(clazz, method, runtimeInvisibleParameterAnnotationsAttribute);
222    }
223
224
225    public void visitAnnotationDefaultAttribute(Clazz clazz, Method method, AnnotationDefaultAttribute annotationDefaultAttribute)
226    {
227        attributeVisitor.visitAnnotationDefaultAttribute(clazz, method, annotationDefaultAttribute);
228    }
229
230
231    public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
232    {
233        byte[] code    = codeAttribute.code;
234        byte[] oldCode = new byte[code.length];
235
236        // Copy the current code.
237        System.arraycopy(code, 0, oldCode, 0, codeAttribute.u4codeLength);
238
239        // Delegate to the real visitor.
240        attributeVisitor.visitCodeAttribute(clazz, method, codeAttribute);
241
242        // Check if the code has changed.
243        if (codeHasChanged(codeAttribute, oldCode))
244        {
245            printChangedCode(clazz, method, codeAttribute, oldCode);
246        }
247    }
248
249
250    // Small utility methods.
251
252    private boolean codeHasChanged(CodeAttribute codeAttribute, byte[] oldCode)
253    {
254        if (oldCode.length != codeAttribute.u4codeLength)
255        {
256            return true;
257        }
258
259        for (int index = 0; index < codeAttribute.u4codeLength; index++)
260        {
261            if (oldCode[index] != codeAttribute.code[index])
262            {
263                return true;
264            }
265        }
266
267        return false;
268    }
269
270
271    private void printChangedCode(Clazz         clazz,
272                                  Method        method,
273                                  CodeAttribute codeAttribute,
274                                  byte[]        oldCode)
275    {
276        System.out.println("Class "+ClassUtil.externalClassName(clazz.getName()));
277        System.out.println("Method "+ClassUtil.externalFullMethodDescription(clazz.getName(),
278                                                                             0,
279                                                                             method.getName(clazz),
280                                                                             method.getDescriptor(clazz)));
281
282        for (int index = 0; index < codeAttribute.u4codeLength; index++)
283        {
284            System.out.println(
285                (oldCode[index] == codeAttribute.code[index]? "  -- ":"  => ")+
286                index+": "+
287                Integer.toHexString(0x100|oldCode[index]           &0xff).substring(1)+" "+
288                Integer.toHexString(0x100|codeAttribute.code[index]&0xff).substring(1));
289        }
290    }
291}
292