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.tree;
22:
23: import EDU.purdue.cs.bloat.editor.*;
24:
25: /**
26: * VarExpr represents an expression that accesses a local variable or a variable
27: * on the stack.
28: *
29: * @see StackExpr
30: * @see LocalExpr
31: *
32: * @see DefExpr
33: */
34: public abstract class VarExpr extends MemExpr {
35: int index;
36:
37: /**
38: * Constructor.
39: *
40: * @param index
41: * Index giving location of expression. For instance, the number
42: * local variable represented or the position of the stack
43: * variable represented.
44: * @param type
45: * Type (descriptor) of this expression.
46: */
47: public VarExpr(final int index, final Type type) {
48: super (type);
49: this .index = index;
50: }
51:
52: public void setIndex(final int index) {
53: this .index = index;
54: }
55:
56: public int index() {
57: return index;
58: }
59:
60: /**
61: * Returns the expression that defines this expression.
62: */
63: public DefExpr def() {
64: if (isDef()) {
65: return this;
66: }
67:
68: return super.def();
69: }
70: }
|