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 */
21package proguard;
22
23import proguard.classfile.*;
24import proguard.classfile.constant.*;
25import proguard.classfile.constant.visitor.ConstantVisitor;
26import proguard.classfile.util.*;
27
28/**
29 * This constant visitor checks whether visited method references try to
30 * access enclosing classes.
31 *
32 * @author Eric Lafortune
33 */
34public class GetEnclosingClassChecker
35extends      SimplifiedVisitor
36implements   ConstantVisitor
37{
38    private final WarningPrinter notePrinter;
39
40
41    /**
42     * Creates a new GetEnclosingMethodChecker.
43     */
44    public GetEnclosingClassChecker(WarningPrinter notePrinter)
45    {
46        this.notePrinter = notePrinter;
47    }
48
49
50    // Implementations for ConstantVisitor.
51
52    public void visitAnyConstant(Clazz clazz, Constant constant) {}
53
54
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        {
61            String methodName = methodrefConstant.getName(clazz);
62
63            if (methodName.equals(ClassConstants.METHOD_NAME_CLASS_GET_ENCLOSING_CLASS) ||
64                methodName.equals(ClassConstants.METHOD_NAME_CLASS_GET_DECLARING_CLASS))
65            {
66                notePrinter.print(clazz.getName(),
67                                  "Note: " +
68                                  ClassUtil.externalClassName(clazz.getName()) +
69                                  " calls '" +
70                                  ClassUtil.externalShortClassName(ClassUtil.externalClassName(className)) +
71                                  "." +
72                                  methodName + "'");
73            }
74        }
75    }
76}
77