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comparison graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/WhileNode.java @ 7292:213c1297a814

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Simple Language: A simple dynamic programming language to demonstrate Truffle features
author Christian Wimmer <christian.wimmer@oracle.com>
date Fri, 21 Dec 2012 10:45:37 -0800
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children 31da1716950f
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7291:a748e4d44694 7292:213c1297a814
1 /*
2 * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.oracle.truffle.sl.nodes;
24
25 import com.oracle.truffle.api.frame.*;
26
27 public class WhileNode extends StatementNode {
28
29 @Child
30 private ConditionNode condition;
31 @Child
32 private StatementNode body;
33
34 private final BreakException breakTarget;
35 private final ContinueException continueTarget;
36
37 public WhileNode(ConditionNode condition, StatementNode body) {
38 this.condition = adoptChild(condition);
39 this.body = adoptChild(body);
40
41 this.breakTarget = new BreakException();
42 this.continueTarget = new ContinueException();
43 }
44
45 @Override
46 public void executeVoid(VirtualFrame frame) {
47 try {
48 while (condition.executeCondition(frame)) {
49 try {
50 body.executeVoid(frame);
51 } catch (ContinueException ex) {
52 if (ex != continueTarget) {
53 throw ex;
54 }
55 // Fall through to next loop iteration.
56 }
57 }
58 } catch (BreakException ex) {
59 if (ex != breakTarget) {
60 throw ex;
61 }
62 // Done executing this loop, exit method to execute statement following the loop.
63 }
64 }
65 }