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Java > Open Source Codes > soot > jimple > toolkits > callgraph > TopologicalOrderer


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 2003 Ondrej 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.callgraph;
28
29 import soot.*;
30 import soot.util.*;
31 import java.util.*;
32
33
34 public class TopologicalOrderer
35 {
36     CallGraph cg;
37     List order = new ArrayList();
38     NumberedSet visited = new NumberedSet( Scene.v().getMethodNumberer() );
39     public TopologicalOrderer( CallGraph cg ) {
40         this.cg = cg;
41     }
42
43     public void go() {
44         Iterator methods = cg.sourceMethods();
45         while( methods.hasNext() ) {
46             SootMethod m = (SootMethod) methods.next();
47             dfsVisit( m );
48         }
49     }
50
51     private void dfsVisit( SootMethod m ) {
52         if( visited.contains( m ) ) return;
53         visited.add( m );
54         Iterator targets = new Targets( cg.edgesOutOf(m) );
55         while( targets.hasNext() ) {
56             SootMethod target = (SootMethod) targets.next();
57             dfsVisit( target );
58         }
59         order.add( m );
60     }
61
62     public List order() { return order; }
63 }
64
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