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Java > Open Source Codes > NullnessAnalysisColorer


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 import soot.*;
21 import soot.tagkit.*;
22 import soot.toolkits.graph.*;
23 import java.util.*;
24 import soot.toolkits.scalar.*;
25 import soot.jimple.*;
26
27 public class NullnessAnalysisColorer extends BodyTransformer {
28     protected void internalTransform (Body b, String JavaDoc phaseName, Map options) {
29         NullnessAnalysis analysis = new NullnessAnalysis
30             (new CompleteUnitGraph(b));
31
32         Iterator it = b.getUnits().iterator();
33
34         while (it.hasNext()) {
35             Stmt s = (Stmt)it.next();
36             
37             Iterator usesIt = s.getUseBoxes().iterator();
38             FlowSet beforeSet = (FlowSet)analysis.getFlowBefore(s);
39                 
40             while (usesIt.hasNext()) {
41                 ValueBox vBox = (ValueBox)usesIt.next();
42                 addColorTags(vBox, beforeSet, s, analysis);
43             }
44
45             Iterator defsIt = s.getDefBoxes().iterator();
46             FlowSet afterSet = (FlowSet)analysis.getFallFlowAfter(s);
47
48             while (defsIt.hasNext()){
49                 ValueBox vBox = (ValueBox)defsIt.next();
50                 addColorTags(vBox, afterSet, s, analysis);
51             }
52         }
53     }
54     
55     private void addColorTags(ValueBox vBox, FlowSet set,
56                               Stmt s, NullnessAnalysis analysis) {
57         Value val = vBox.getValue();
58         if (val.getType() instanceof RefLikeType &&
59                 ((ArraySparseSet)set).contains(val))
60             vBox.addTag(new ColorTag(ColorTag.GREEN));
61     }
62 }
63
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