01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10: Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11: Suite 350, San Mateo, CA 94403, USA.
12:
13: db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14: WARRANTY; without even the implied warranty of MERCHANTABILITY or
15: FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16: for more details.
17:
18: You should have received a copy of the GNU General Public License along
19: with this program; if not, write to the Free Software Foundation, Inc.,
20: 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21: package EDU.purdue.cs.bloat.editor;
22:
23: import java.util.*;
24:
25: import EDU.purdue.cs.bloat.tree.*;
26:
27: public class UseMap {
28:
29: public Hashtable map;
30:
31: public UseMap() {
32: map = new Hashtable();
33: }
34:
35: public void add(final LocalExpr use, final Instruction inst) {
36:
37: final Node def = use.def();
38: if (def != null) {
39: map.put(inst, def);
40: }
41: }
42:
43: public boolean hasDef(final Instruction inst) {
44:
45: return map.containsKey(inst);
46: }
47:
48: public boolean hasSameDef(final Instruction a, final Instruction b) {
49: return map.containsKey(a) && map.containsKey(b)
50: && (map.get(a) == map.get(b));
51: }
52:
53: }
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