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


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 an "chop frame".
29  *
30  * @author Eric Lafortune
31  */
32 public class LessZeroFrame extends StackMapFrame
33 {
34     public int choppedVariablesCount;
35
36
37     /**
38      * Creates an uninitialized LessZeroFrame.
39      */
40     public LessZeroFrame()
41     {
42     }
43
44
45     /**
46      * Creates a LessZeroFrame with the given tag.
47      */
48     public LessZeroFrame(int tag)
49     {
50         choppedVariablesCount = LESS_ZERO_FRAME + 3 - tag;
51     }
52
53
54     /**
55      * Creates a LessZeroFrame with the given number of chopped variables.
56      */
57     public LessZeroFrame(byte choppedVariablesCount)
58     {
59         this.choppedVariablesCount = (int)choppedVariablesCount;
60     }
61
62
63     // Implementations for StackMapFrame.
64
65     public int getTag()
66     {
67         return LESS_ZERO_FRAME + 3 - choppedVariablesCount;
68     }
69
70
71     public void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, StackMapFrameVisitor stackMapFrameVisitor)
72     {
73         stackMapFrameVisitor.visitLessZeroFrame(clazz, method, codeAttribute, offset, this);
74     }
75
76
77     // Implementations for Object.
78
79     public boolean equals(Object JavaDoc object)
80     {
81         if (!super.equals(object))
82         {
83             return false;
84         }
85
86         LessZeroFrame other = (LessZeroFrame)object;
87
88         return this.u2offsetDelta == other.u2offsetDelta &&
89                this.choppedVariablesCount != other.choppedVariablesCount;
90     }
91
92
93     public int hashCode()
94     {
95         return super.hashCode() ^ choppedVariablesCount;
96     }
97
98
99     public String JavaDoc toString()
100     {
101         return super.toString()+"Var: (chopped "+choppedVariablesCount+"), Stack: (empty)";
102     }
103 }
104
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