1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  *             of Java bytecode.
4  *
5  * Copyright (c) 2002-2014 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  */
21 package proguard;
22 
23 import proguard.classfile.*;
24 import proguard.classfile.constant.*;
25 import proguard.classfile.constant.visitor.ConstantVisitor;
26 import proguard.classfile.util.*;
27 
28 /**
29  * This constant visitor checks whether visited method references try to
30  * access signatures.
31  *
32  * @author Eric Lafortune
33  */
34 public class GetSignatureChecker
35 extends      SimplifiedVisitor
36 implements   ConstantVisitor
37 {
38     private final WarningPrinter notePrinter;
39 
40 
41     /**
42      * Creates a new GetSignatureChecker.
43      */
GetSignatureChecker(WarningPrinter notePrinter)44     public GetSignatureChecker(WarningPrinter notePrinter)
45     {
46         this.notePrinter = notePrinter;
47     }
48 
49 
50     // Implementations for ConstantVisitor.
51 
visitAnyConstant(Clazz clazz, Constant constant)52     public void visitAnyConstant(Clazz clazz, Constant constant) {}
53 
54 
visitMethodrefConstant(Clazz clazz, MethodrefConstant methodrefConstant)55     public void visitMethodrefConstant(Clazz clazz, MethodrefConstant methodrefConstant)
56     {
57         String className = methodrefConstant.getClassName(clazz);
58 
59         if (className.equals(ClassConstants.NAME_JAVA_LANG_CLASS)         ||
60             className.equals(ClassConstants.NAME_JAVA_LANG_REFLECT_FIELD) ||
61             className.equals(ClassConstants.NAME_JAVA_LANG_REFLECT_METHOD))
62         {
63             String methodName = methodrefConstant.getName(clazz);
64 
65             if (methodName.startsWith(ClassConstants.METHOD_NAME_GET_TYPE_PREFIX) ||
66                 methodName.startsWith(ClassConstants.METHOD_NAME_GET_GENERIC_PREFIX))
67             {
68                 notePrinter.print(clazz.getName(),
69                                   "Note: " +
70                                   ClassUtil.externalClassName(clazz.getName()) +
71                                   " calls '" +
72                                   ClassUtil.externalShortClassName(ClassUtil.externalClassName(className)) +
73                                   "." +
74                                   methodName + "'");
75             }
76         }
77     }
78 }
79