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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLWhileNode.java @ 13821:b16ec83edc73

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Documentation and more refactoring of Simple Language
author Christian Wimmer <christian.wimmer@oracle.com>
date Wed, 29 Jan 2014 20:45:43 -0800
parents 7c418666c6c9
children 64c77f0577bb
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1 /*
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2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
213c1297a814 Simple Language: A simple dynamic programming language to demonstrate Truffle features
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
213c1297a814 Simple Language: A simple dynamic programming language to demonstrate Truffle features
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.truffle.sl.nodes.controlflow;
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24
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25 import com.oracle.truffle.api.*;
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26 import com.oracle.truffle.api.dsl.*;
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27 import com.oracle.truffle.api.frame.*;
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28 import com.oracle.truffle.api.nodes.*;
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29 import com.oracle.truffle.api.utilities.*;
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30 import com.oracle.truffle.sl.nodes.*;
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31
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32 @NodeInfo(shortName = "while")
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33 public class SLWhileNode extends SLStatementNode {
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34
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35 @Child private SLExpressionNode conditionNode;
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36 @Child private SLStatementNode bodyNode;
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37
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38 private final BranchProfile continueTaken = new BranchProfile();
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39 private final BranchProfile breakTaken = new BranchProfile();
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40
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41 public SLWhileNode(SLExpressionNode conditionNode, SLStatementNode bodyNode) {
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42 this.conditionNode = adoptChild(conditionNode);
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43 this.bodyNode = adoptChild(bodyNode);
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44 }
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45
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46 @Override
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47 public void executeVoid(VirtualFrame frame) {
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48 int count = 0;
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49 try {
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50 while (evaluateCondition(frame)) {
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51 try {
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52 bodyNode.executeVoid(frame);
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53 if (CompilerDirectives.inInterpreter()) {
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54 count++;
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55 }
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56 } catch (SLContinueException ex) {
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57 continueTaken.enter();
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58 /* Fall through to next loop iteration. */
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59 }
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60 }
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61 } catch (SLBreakException ex) {
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62 breakTaken.enter();
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63 /* Done executing this loop, exit method to execute statement following the loop. */
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64 } finally {
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65 if (CompilerDirectives.inInterpreter()) {
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66 /*
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67 * Report the loop count to the Truffle system. It is used for compilation and
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68 * inlining decisions.
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69 */
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70 RootNode root = getRootNode();
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71 if (root.getCallTarget() instanceof LoopCountReceiver) {
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72 ((LoopCountReceiver) root.getCallTarget()).reportLoopCount(count);
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73 }
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74 }
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75 }
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76 }
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77
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78 private boolean evaluateCondition(VirtualFrame frame) {
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79 try {
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80 /*
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81 * The condition must evaluate to a boolean value, so we call boolean-specialized
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82 * method.
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83 */
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84 return conditionNode.executeBoolean(frame);
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85 } catch (UnexpectedResultException ex) {
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86 /*
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87 * The condition evaluated to a non-boolean result. This is a type error in the SL
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88 * program. We report it with the same exception that Truffle DSL generated nodes use to
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89 * report type errors.
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90 */
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91 throw new UnsupportedSpecializationException(this, ex.getResult());
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92 }
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93 }
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94 }