Mercurial > hg > graal-compiler
comparison graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/WhileNode.java @ 7292:213c1297a814
Simple Language: A simple dynamic programming language to demonstrate Truffle features
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Fri, 21 Dec 2012 10:45:37 -0800 |
parents | |
children | 31da1716950f |
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7291:a748e4d44694 | 7292:213c1297a814 |
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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 } |