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Java > Open Source Codes > soot > tagkit > JasminAttribute


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 2000 Patrice Pominville and Feng Qian
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 1997-1999.
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 import soot.*;
29
30 import java.util.*;
31 import java.io.*;
32
33
34
35 /**
36  * This class must be extended by Attributes that can
37  * be emitted in Jasmin. The attributes must format their data
38  * in Base64 and if Unit references they may contain must be emitted as
39  * labels embedded and
40  * escaped in the attribute's Base64 data stream at the location where the value
41  * of their pc is to occur. For example:
42 <pre>
43     aload_1
44     iload_2
45     label2:
46     iaload
47  label3:
48     iastore
49     iinc 2 1
50     label0:
51     iload_2
52     aload_0
53     arraylength
54  label4:
55    if_icmplt label1
56    return
57  .code_attribute ArrayCheckAttribute "%label2%Aw==%label3%Ag==%label4%Ag=="
58
59 </pre>
60  *
61  */
62
63
64 public abstract class JasminAttribute implements Attribute
65 {
66     abstract public byte[] decode(String JavaDoc attr, Hashtable labelToPc);
67     
68     abstract public String JavaDoc getJasminValue(Map instToLabel);
69 }
70
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