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Java > Open Source Codes > soot > baf > toolkits > base > ExamplePeephole


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 1999 Patrice Pominville
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.baf.toolkits.base;
28
29 import java.util.*;
30
31 import soot.*;
32 import soot.baf.*;
33 import soot.tagkit.*;
34
35 /**
36  * Example peephole that remove all checkcast operations.
37  * Resulting class will likely not verify.
38  */
39
40 public class ExamplePeephole implements Peephole
41 {
42     public boolean apply(Body b)
43     {
44         boolean changed = false;
45         
46         Iterator it = b.getUnits().iterator();
47         while(it.hasNext()) {
48             Unit u = (Unit) it.next();
49             if(u instanceof InstanceCastInst) {
50                 it.remove();
51                 changed = true;
52             }
53         }
54
55         return changed;
56     }
57 }
58
59
60
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