annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLRepeatingNode.java @ 22157:dc83cc1f94f2

Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 503529c65456
children a63bda98cfdb
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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 * The Universal Permissive License (UPL), Version 1.0
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6 *
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7 * Subject to the condition set forth below, permission is hereby granted to any
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8 * person obtaining a copy of this software, associated documentation and/or
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9 * data (collectively the "Software"), free of charge and under any and all
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10 * copyright rights in the Software, and any and all patent rights owned or
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11 * freely licensable by each licensor hereunder covering either (i) the
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12 * unmodified Software as contributed to or provided by such licensor, or (ii)
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13 * the Larger Works (as defined below), to deal in both
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14 *
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15 * (a) the Software, and
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16 *
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17 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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18 * one is included with the Software each a "Larger Work" to which the Software
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19 * is contributed by such licensors),
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20 *
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21 * without restriction, including without limitation the rights to copy, create
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22 * derivative works of, display, perform, and distribute the Software and make,
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23 * use, sell, offer for sale, import, export, have made, and have sold the
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24 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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25 * either these or other terms.
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26 *
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27 * This license is subject to the following condition:
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28 *
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29 * The above copyright notice and either this complete permission notice or at a
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30 * minimum a reference to the UPL must be included in all copies or substantial
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31 * portions of the Software.
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32 *
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33 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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34 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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35 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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36 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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37 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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38 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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39 * SOFTWARE.
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40 */
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41 package com.oracle.truffle.sl.nodes.controlflow;
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42
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43 import com.oracle.truffle.api.dsl.UnsupportedSpecializationException;
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44 import com.oracle.truffle.api.frame.VirtualFrame;
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45 import com.oracle.truffle.api.nodes.Node;
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46 import com.oracle.truffle.api.nodes.RepeatingNode;
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47 import com.oracle.truffle.api.nodes.UnexpectedResultException;
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48 import com.oracle.truffle.api.source.SourceSection;
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49 import com.oracle.truffle.api.utilities.BranchProfile;
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50 import com.oracle.truffle.sl.nodes.SLExpressionNode;
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51 import com.oracle.truffle.sl.nodes.SLStatementNode;
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52
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53 public final class SLRepeatingNode extends Node implements RepeatingNode {
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54
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55 /**
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56 * The condition of the loop. This in a {@link SLExpressionNode} because we require a result
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57 * value. We do not have a node type that can only return a {@code boolean} value, so
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58 * {@link #evaluateCondition executing the condition} can lead to a type error.
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59 */
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60 @Child private SLExpressionNode conditionNode;
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61
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62 /** Statement (or {@link SLBlockNode block}) executed as long as the condition is true. */
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63 @Child private SLStatementNode bodyNode;
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64
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65 /**
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66 * Profiling information, collected by the interpreter, capturing whether a {@code continue}
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67 * statement was used in this loop. This allows the compiler to generate better code for loops
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68 * without a {@code continue}.
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69 */
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70 private final BranchProfile continueTaken = BranchProfile.create();
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71 private final BranchProfile breakTaken = BranchProfile.create();
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72
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73 public SLRepeatingNode(SourceSection src, SLExpressionNode conditionNode, SLStatementNode bodyNode) {
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74 super(src);
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75 this.conditionNode = conditionNode;
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76 this.bodyNode = bodyNode;
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77 }
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78
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79 public boolean executeRepeating(VirtualFrame frame) {
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80 if (evaluateCondition(frame)) {
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81 try {
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82 /* Execute the loop body. */
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83 bodyNode.executeVoid(frame);
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84 } catch (SLContinueException ex) {
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85 /* In the interpreter, record profiling information that the loop uses continue. */
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86 continueTaken.enter();
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87 /* Fall through to next loop iteration. */
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88 } catch (SLBreakException ex) {
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89 /* In the interpreter, record profiling information that the loop uses break. */
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90 breakTaken.enter();
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91 /* Done executing this loop, exit method to execute statement following the loop. */
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92 return false;
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93 }
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94 return true;
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95 } else {
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96 return false;
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97 }
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98 }
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99
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100 private boolean evaluateCondition(VirtualFrame frame) {
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101 try {
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102 /*
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103 * The condition must evaluate to a boolean value, so we call the boolean-specialized
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104 * execute method.
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105 */
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106 return (conditionNode.executeBoolean(frame));
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107 } catch (UnexpectedResultException ex) {
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108 /*
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109 * The condition evaluated to a non-boolean result. This is a type error in the SL
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110 * program. We report it with the same exception that Truffle DSL generated nodes use to
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111 * report type errors.
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112 */
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113 throw new UnsupportedSpecializationException(this, new Node[]{conditionNode}, ex.getResult());
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114 }
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115 }
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116
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117 @Override
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118 public String toString() {
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119 return SLStatementNode.formatSourceSection(this);
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120 }
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121
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122 }