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Java > Open Source Codes > soot > tagkit > BytecodeOffsetTag


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 1997-2002 Raja Vallee-Rai
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the
16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17  * Boston, MA 02111-1307, USA.
18  */
19
20 /*
21  * Modified by the Sable Research Group and others 1997-2002.
22  * See the 'credits' file distributed with Soot for the complete list of
23  * contributors. (Soot is distributed at http://www.sable.mcgill.ca/soot)
24  */
25
26 package soot.tagkit;
27
28 /** This class represents a tag for byte-code offset of
29  * instructions that correspond to Jimple statements.
30  *
31  * @author Roman Manevich.
32  * @since October 3 2002 Initial creation.
33  */
34
35 public class BytecodeOffsetTag implements Tag {
36   /** The index of the last byte-code instruction.
37    */
38   private int offset;
39
40   /** Constructs a tag from the index offset.
41    */
42   public BytecodeOffsetTag(int offset) {
43     this.offset = offset;
44   }
45     
46   /** Returns the name of this tag.
47    */
48   public String JavaDoc getName() {
49     return "BytecodeOffsetTag";
50   }
51
52   /** Returns the offset in a four byte array.
53    */
54   public byte [] getValue() {
55     byte [] v = new byte[4];
56     v[0] = (byte) ((offset >> 24) % 256);;
57     v[1] = (byte) ((offset >> 16) % 256);;
58     v[2] = (byte) ((offset >> 8) % 256);;
59     v[3] = (byte) (offset % 256);
60     return v;
61   }
62
63   /** Returns the offset as an int.
64    */
65   public int getBytecodeOffset() {
66     return offset;
67   }
68
69   /** Returns the offset in a string.
70    */
71   public String JavaDoc toString() {
72     return "" + offset;
73   }
74 }
75
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