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Java > Open Source Codes > soot > UnknownType


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;
31 import soot.*;
32
33 import soot.util.*;
34 import java.util.*;
35
36 /**
37  * Soot representation used for not-yet-typed objects. Implemented as
38  * a singleton.
39  */
40 public class UnknownType extends Type
41 {
42     public UnknownType( Singletons.Global g ) {}
43     public static UnknownType v() { return G.v().soot_UnknownType(); }
44
45     public int hashCode()
46     {
47         return 0x5CAE5357;
48     }
49     
50     public boolean equals(Object JavaDoc t)
51     {
52         return this == t;
53     }
54
55     public String JavaDoc toString()
56     {
57         return ".unknown";
58     }
59     
60     public void apply(Switch sw)
61     {
62         ((TypeSwitch) sw).caseUnknownType(this);
63     }
64
65     /** Returns the least common superclass of this type and other. */
66     public Type merge(Type other, Scene cm)
67     {
68         if (other instanceof RefType)
69             return other;
70         throw new RuntimeException JavaDoc("illegal type merge: "
71                                    + this + " and " + other);
72     }
73 }
74
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