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Java > Open Source Codes > proguard > classfile > attribute > preverification > SameZeroFrame


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
6  *
7  * This library 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 library 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 Lesser General Public License
15  * for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public License
18  * along with this library; if not, write to the Free Software Foundation,
19  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 package proguard.classfile.attribute.preverification;
22
23 import proguard.classfile.*;
24 import proguard.classfile.attribute.CodeAttribute;
25 import proguard.classfile.attribute.preverification.visitor.*;
26
27 /**
28  * This StackMapFrame represents a "same frame" or a "same frame extended".
29  *
30  * @author Eric Lafortune
31  */
32 public class SameZeroFrame extends StackMapFrame
33 {
34     /**
35      * Creates an uninitialized SameZeroFrame.
36      */
37     public SameZeroFrame()
38     {
39     }
40
41
42     /**
43      * Creates a SameZeroFrame with the given tag.
44      */
45     public SameZeroFrame(int tag)
46     {
47         u2offsetDelta = tag - SAME_ZERO_FRAME;
48     }
49
50
51     // Implementations for StackMapFrame.
52
53     public int getTag()
54     {
55         return u2offsetDelta < 64 ?
56             SAME_ZERO_FRAME + u2offsetDelta :
57             SAME_ZERO_FRAME_EXTENDED;
58     }
59
60
61     public void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, StackMapFrameVisitor stackMapFrameVisitor)
62     {
63         stackMapFrameVisitor.visitSameZeroFrame(clazz, method, codeAttribute, offset, this);
64     }
65
66
67     // Implementations for Object.
68
69     public String JavaDoc toString()
70     {
71         return super.toString()+"Var: ..., Stack: (empty)";
72     }
73 }
74
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