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Java > Open Source Codes > soot > jimple > toolkits > scalar > PessimisticAvailableExpressionsAnalysis


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 2004 Jennifer Lhotak
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 package soot.jimple.toolkits.scalar;
28 import soot.*;
29 import soot.toolkits.scalar.*;
30 import soot.toolkits.graph.*;
31 import soot.jimple.*;
32 import soot.jimple.toolkits.pointer.*;
33 import java.util.*;
34 import soot.util.*;
35
36 /** Implements an available expressions analysis on local variables.
37  * pessimistic analysis - for teaching 621*/
38 public class PessimisticAvailableExpressionsAnalysis extends SlowAvailableExpressionsAnalysis
39 {
40     public PessimisticAvailableExpressionsAnalysis(DirectedGraph dg, SootMethod m, SideEffectTester st){
41         super(dg);
42     }
43     
44     protected Object JavaDoc newInitialFlow()
45     {
46         Object JavaDoc newSet = emptySet.clone();
47         //((ToppedSet)newSet).setTop(true);
48 return newSet;
49     }
50
51 }
52
53
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