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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLIfNode.java @ 22548:6b76a24fffbd default tip

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Use all variables: a, b, u,v and x, y
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 14 Jan 2016 14:20:57 +0100
parents a63bda98cfdb
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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.NodeInfo;
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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.profiles.ConditionProfile;
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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 @NodeInfo(shortName = "if", description = "The node implementing a condional statement")
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54 public final class SLIfNode extends SLStatementNode {
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55
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56 /**
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57 * The condition of the {@code if}. This in a {@link SLExpressionNode} because we require a
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58 * result value. We do not have a node type that can only return a {@code boolean} value, so
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59 * {@link #evaluateCondition executing the condition} can lead to a type error.
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60 */
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61 @Child private SLExpressionNode conditionNode;
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62
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63 /** Statement (or {@link SLBlockNode block}) executed when the condition is true. */
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64 @Child private SLStatementNode thenPartNode;
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65
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66 /** Statement (or {@link SLBlockNode block}) executed when the condition is false. */
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67 @Child private SLStatementNode elsePartNode;
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68
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69 /**
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70 * Profiling information, collected by the interpreter, capturing the profiling information of
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71 * the condition. This allows the compiler to generate better code for conditions that are
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72 * always true or always false. Additionally the {@link CountingConditionProfile} implementation
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73 * (as opposed to {@link BinaryConditionProfile} implementation) transmits the probability of
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74 * the condition to be true to the compiler.
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75 */
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76 private final ConditionProfile condition = ConditionProfile.createCountingProfile();
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77
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78 public SLIfNode(SourceSection src, SLExpressionNode conditionNode, SLStatementNode thenPartNode, SLStatementNode elsePartNode) {
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79 super(src);
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80 this.conditionNode = conditionNode;
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81 this.thenPartNode = thenPartNode;
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82 this.elsePartNode = elsePartNode;
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83 }
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84
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85 @Override
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86 public void executeVoid(VirtualFrame frame) {
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87 /*
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88 * In the interpreter, record profiling information that the condition was executed and with
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89 * which outcome.
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90 */
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91 if (condition.profile(evaluateCondition(frame))) {
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92 /* Execute the then-branch. */
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93 thenPartNode.executeVoid(frame);
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94 } else {
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95 /* Execute the else-branch (which is optional according to the SL syntax). */
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96 if (elsePartNode != null) {
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97 elsePartNode.executeVoid(frame);
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98 }
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99 }
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100 }
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101
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102 private boolean evaluateCondition(VirtualFrame frame) {
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103 try {
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104 /*
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105 * The condition must evaluate to a boolean value, so we call the boolean-specialized
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106 * execute method.
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107 */
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108 return conditionNode.executeBoolean(frame);
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109 } catch (UnexpectedResultException ex) {
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110 /*
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111 * The condition evaluated to a non-boolean result. This is a type error in the SL
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112 * program. We report it with the same exception that Truffle DSL generated nodes use to
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113 * report type errors.
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114 */
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115 throw new UnsupportedSpecializationException(this, new Node[]{conditionNode}, ex.getResult());
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116 }
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117 }
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118 }