Mercurial > hg > truffle
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> |
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date | Wed, 16 Sep 2015 11:33:22 +0200 |
parents | 503529c65456 |
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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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17421
diff
changeset
|
120 } |
3844fb65016c
SL: repeating node should implement SLStatementNode for a proper toString implementation.
Christian Humer <christian.humer@gmail.com>
parents:
17421
diff
changeset
|
121 |
16917
6af9d523222a
SL: use new LoopNode API.
Christian Humer <christian.humer@gmail.com>
parents:
diff
changeset
|
122 } |