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Java > Open Source Codes > soot > jimple > toolkits > annotation > tags > ArrayNullTagAggregator


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 2003 Feng Qian
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.annotation.tags;
21
22
23 import soot.*;
24 import java.util.*;
25 import soot.baf.*;
26
27 import soot.tagkit.*;
28
29 /** The aggregator for ArrayNullCheckAttribute. */
30
31 public class ArrayNullTagAggregator extends TagAggregator
32 {
33     public ArrayNullTagAggregator( Singletons.Global g ) {}
34     public static ArrayNullTagAggregator v() { return G.v().soot_jimple_toolkits_annotation_tags_ArrayNullTagAggregator(); }
35
36     public boolean wantTag( Tag t ) {
37     return (t instanceof OneByteCodeTag);
38     }
39     public void considerTag(Tag t, Unit u)
40     {
41         Inst i = (Inst) u;
42         if(! ( i.containsInvokeExpr()
43             || i.containsFieldRef()
44             || i.containsArrayRef() ) ) return;
45
46         OneByteCodeTag obct = (OneByteCodeTag) t;
47
48         if( units.size() == 0 || units.getLast() != u ) {
49             units.add( u );
50             tags.add( new ArrayNullCheckTag() );
51         }
52         ArrayNullCheckTag anct = (ArrayNullCheckTag) tags.getLast();
53         anct.accumulate(obct.getValue()[0]);
54     }
55     
56     public String JavaDoc aggregatedName()
57     {
58         return "ArrayNullCheckAttribute";
59     }
60 }
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