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Java > Open Source Codes > soot > jimple > Constant


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 1997-1999 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 1997-1999.
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
27
28
29
30 package soot.jimple;
31
32 import soot.tagkit.*;
33 import soot.baf.*;
34 import soot.*;
35 import soot.util.*;
36 import java.util.*;
37
38 public abstract class Constant implements Value, ConvertToBaf, Immediate
39 {
40     public List getUseBoxes()
41     {
42         return AbstractUnit.emptyList;
43     }
44
45     /** Adds a Baf instruction pushing this constant to the stack onto <code>out</code>. */
46     public void convertToBaf(JimpleToBafContext context, List out)
47     {
48         Unit u = Baf.v().newPushInst(this);
49         out.add(u);
50
51         Iterator it = context.getCurrentUnit().getTags().iterator();
52
53     while(it.hasNext())
54         {
55             u.addTag((Tag) it.next());
56     }
57     }
58
59     /** Clones the current constant. Not implemented here. */
60     public Object JavaDoc clone()
61     {
62         throw new RuntimeException JavaDoc();
63     }
64
65     /** Returns true if this object is structurally equivalent to c.
66      * For Constants, equality is structural equality, so we just call equals(). */
67     public boolean equivTo(Object JavaDoc c)
68     {
69         return equals(c);
70     }
71
72     /** Returns a hash code consistent with structural equality for this object.
73      * For Constants, equality is structural equality; we hope that each subclass defines hashCode() correctly. */
74     public int equivHashCode()
75     {
76         return hashCode();
77     }
78     
79     public void toString( UnitPrinter up ) {
80         up.constant(this);
81     }
82 }
83
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