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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLIfNode.java @ 16829:e3724f25056a

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SL: use the new IntegerConditionProfile in simple language.
author Christian Humer <christian.humer@gmail.com>
date Thu, 14 Aug 2014 13:11:47 +0200
parents abe7128ca473
children 226552569e34
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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
213c1297a814 Simple Language: A simple dynamic programming language to demonstrate Truffle features
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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
213c1297a814 Simple Language: A simple dynamic programming language to demonstrate Truffle features
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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.dsl.*;
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26 import com.oracle.truffle.api.frame.*;
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27 import com.oracle.truffle.api.nodes.*;
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28 import com.oracle.truffle.api.source.*;
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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 = "if", description = "The node implementing a condional statement")
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33 public final class SLIfNode extends SLStatementNode {
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34
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35 /**
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36 * The condition of the {@code if}. This in a {@link SLExpressionNode} because we require a
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37 * result value. We do not have a node type that can only return a {@code boolean} value, so
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38 * {@link #evaluateCondition executing the condition} can lead to a type error.
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39 */
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40 @Child private SLExpressionNode conditionNode;
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41
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42 /** Statement (or {@link SLBlockNode block}) executed when the condition is true. */
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43 @Child private SLStatementNode thenPartNode;
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44
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45 /** Statement (or {@link SLBlockNode block}) executed when the condition is false. */
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46 @Child private SLStatementNode elsePartNode;
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47
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48 /**
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49 * Profiling information, collected by the interpreter, capturing the profiling information of
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50 * the condition. This allows the compiler to generate better code for conditions that are
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51 * always true or always false. Additionally the {@link IntegerConditionProfile} implementation
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52 * (as opposed to {@link BooleanConditionProfile} implementation) transmits the probability of
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53 * the condition to be true to the compiler.
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54 */
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55 private final ConditionProfile condition = new IntegerConditionProfile();
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56
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57 public SLIfNode(SourceSection src, SLExpressionNode conditionNode, SLStatementNode thenPartNode, SLStatementNode elsePartNode) {
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58 super(src);
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59 this.conditionNode = conditionNode;
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60 this.thenPartNode = thenPartNode;
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61 this.elsePartNode = elsePartNode;
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62 }
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63
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64 @Override
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65 public void executeVoid(VirtualFrame frame) {
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66 /*
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67 * In the interpreter, record profiling information that the condition was executed and with
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68 * which outcome.
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69 */
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70 if (condition.profile(evaluateCondition(frame))) {
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71 /* Execute the then-branch. */
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72 thenPartNode.executeVoid(frame);
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73 } else {
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74 /* Execute the else-branch (which is optional according to the SL syntax). */
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75 if (elsePartNode != null) {
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76 elsePartNode.executeVoid(frame);
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77 }
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78 }
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79 }
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80
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81 private boolean evaluateCondition(VirtualFrame frame) {
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82 try {
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83 /*
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84 * The condition must evaluate to a boolean value, so we call the boolean-specialized
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85 * execute method.
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86 */
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87 return conditionNode.executeBoolean(frame);
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88 } catch (UnexpectedResultException ex) {
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89 /*
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90 * The condition evaluated to a non-boolean result. This is a type error in the SL
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91 * program. We report it with the same exception that Truffle DSL generated nodes use to
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92 * report type errors.
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93 */
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94 throw new UnsupportedSpecializationException(this, new Node[]{conditionNode}, ex.getResult());
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95 }
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96 }
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97 }