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


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 2000 Patrick Lam
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 java.util.*;
33 import soot.util.*;
34
35 /** Provides an user-interface for the AvailableExpressionsAnalysis class.
36  * Returns, for each statement, the list of expressions available before and after it. */
37 public interface AvailableExpressions
38 {
39     /** Returns a List containing the UnitValueBox pairs corresponding to expressions available before u. */
40     public List getAvailablePairsBefore(Unit u);
41
42     /** Returns a List containing the UnitValueBox pairs corresponding to expressions available after u. */
43     public List getAvailablePairsAfter(Unit u);
44
45     /** Returns a Chain containing the EquivalentValue objects corresponding to expressions available before u. */
46     public Chain getAvailableEquivsBefore(Unit u);
47
48     /** Returns a Chain containing the EquivalentValue objects corresponding to expressions available after u. */
49     public Chain getAvailableEquivsAfter(Unit u);
50 }
51
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