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.cfg.*;
24:
25: /**
26: * IfZeroStmt evaluates an expression and executes one of its two branches
27: * depending on whether or not the expression evaluated to zero.
28: */
29: public class IfZeroStmt extends IfStmt {
30: Expr expr; // Expression to evaluate
31:
32: /**
33: * Constructor.
34: *
35: * @param comparison
36: * Comparison operator.
37: * @param expr
38: * An expression to be evaluated.
39: * @param trueTarget
40: * Basic Block that is executed if the expression evaluates to
41: * zero.
42: * @param falseTarget
43: * Basic Block that is executed if the expression evaluates to
44: * non-zero.
45: */
46: public IfZeroStmt(final int comparison, final Expr expr,
47: final Block trueTarget, final Block falseTarget) {
48: super (comparison, trueTarget, falseTarget);
49: this .expr = expr;
50: expr.setParent(this );
51: }
52:
53: /**
54: * @return The expression that is evaluated.
55: */
56: public Expr expr() {
57: return expr;
58: }
59:
60: public void visitForceChildren(final TreeVisitor visitor) {
61: expr.visit(visitor);
62: }
63:
64: public void visit(final TreeVisitor visitor) {
65: visitor.visitIfZeroStmt(this );
66: }
67:
68: public Object clone() {
69: return copyInto(new IfZeroStmt(comparison, (Expr) expr.clone(),
70: trueTarget, falseTarget));
71: }
72: }
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