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Java > Open Source Codes > soot > dava > toolkits > base > misc > ThrowNullConverter


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 2003 Jerome Miecznikowski
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.dava.toolkits.base.misc;
21
22 import soot.*;
23 import soot.util.*;
24 import java.util.*;
25 import soot.dava.*;
26 import soot.jimple.*;
27 import soot.grimp.internal.*;
28 import soot.dava.internal.asg.*;
29 import soot.dava.internal.javaRep.*;
30
31 public class ThrowNullConverter
32 {
33     public ThrowNullConverter( Singletons.Global g ) {}
34     public static ThrowNullConverter v() { return G.v().soot_dava_toolkits_base_misc_ThrowNullConverter(); }
35
36     private RefType npeRef = RefType.v( Scene.v().loadClassAndSupport( "java.lang.NullPointerException"));
37
38     public void convert( DavaBody body)
39     {
40     Iterator it = body.getUnits().iterator();
41     while (it.hasNext()) {
42         Unit u = (Unit) it.next();
43
44         if (u instanceof ThrowStmt) {
45         ValueBox opBox = ((ThrowStmt) u).getOpBox();
46         Value op = opBox.getValue();
47
48         if (op.getType() instanceof NullType)
49             opBox.setValue( new DNewInvokeExpr( npeRef, null, new ArrayList()));
50         }
51     }
52     }
53 }
54
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