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


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 2003 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 package soot.jimple.toolkits.callgraph;
21
22 import soot.*;
23 import java.util.*;
24 import soot.toolkits.graph.*;
25 import soot.toolkits.scalar.*;
26 import soot.tagkit.*;
27 import soot.jimple.*;
28
29 public class ClinitElimTransformer extends BodyTransformer {
30     
31     protected void internalTransform(Body b, String JavaDoc phaseName, Map options){
32         ClinitElimAnalysis a = new ClinitElimAnalysis( new BriefUnitGraph(b));
33
34         CallGraph cg = Scene.v().getCallGraph();
35         
36         SootMethod m = b.getMethod();
37
38         Iterator edgeIt = cg.edgesOutOf(m);
39
40         while (edgeIt.hasNext()){
41             Edge e = (Edge)edgeIt.next();
42             if (e.srcStmt() == null) continue;
43             if (!e.isClinit()) continue;
44             FlowSet methods = (FlowSet) a.getFlowBefore(e.srcStmt());
45             if (methods.contains(e.tgt())){
46                 cg.removeEdge(e);
47             }
48         }
49     }
50 }
51
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