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Java > Open Source Codes > soot > tagkit > ImportantTagAggregator


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 2003 Ondrej 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 /*
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
28 package soot.tagkit;
29
30
31 import soot.*;
32 import java.util.*;
33 import soot.baf.*;
34
35 /** A tag aggregator that associates a tag with the <b>most important</b>
36  * instruction that is tagged with it. An instruction is important if
37  * it contains a field or array reference, a method invocation, or an
38  * object allocation.
39  */
40 public abstract class ImportantTagAggregator extends TagAggregator
41 {
42     /** Decide whether this tag should be aggregated by this aggregator. */
43     public abstract boolean wantTag( Tag t );
44
45     /** Return name of the resulting aggregated tag. */
46     public abstract String JavaDoc aggregatedName();
47
48     /** Decide whether this tag should be aggregated by this aggregator. */
49     public void considerTag(Tag t, Unit u)
50     {
51         Inst i = (Inst) u;
52         if(! ( i.containsInvokeExpr()
53             || i.containsFieldRef()
54             || i.containsArrayRef()
55             || i.containsNewExpr() ) ) return;
56         units.add(u);
57         tags.add(t);
58     }
59 }
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