Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLWhileNode.java @ 15989:f62cc9f09c7b
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author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Mon, 02 Jun 2014 17:09:51 +0200 |
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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 |
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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 |
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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", description = "The node implementing a while loop") |
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33 public final class SLWhileNode extends SLStatementNode { |
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34 |
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35 /** |
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36 * The condition of the loop. This in a {@link SLExpressionNode} because we require a result |
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37 * 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 |
14906 | 42 /** Statement (or {@link SLBlockNode block}) executed as long as the condition is true. */ |
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43 @Child private SLStatementNode bodyNode; |
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44 |
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45 /** |
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46 * Profiling information, collected by the interpreter, capturing whether a {@code continue} |
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47 * statement was used in this loop. This allows the compiler to generate better code for loops |
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48 * without a {@code continue}. |
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49 */ |
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50 private final BranchProfile continueTaken = new BranchProfile(); |
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51 private final BranchProfile breakTaken = new BranchProfile(); |
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52 |
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53 public SLWhileNode(SLExpressionNode conditionNode, SLStatementNode bodyNode) { |
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54 /* |
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55 * It is a Truffle requirement to call adoptChild(), which performs all the necessary steps |
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56 * to add the new child to the node tree. |
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57 */ |
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58 this.conditionNode = conditionNode; |
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59 this.bodyNode = bodyNode; |
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60 } |
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61 |
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62 @Override |
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63 public void executeVoid(VirtualFrame frame) { |
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64 int count = 0; |
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65 try { |
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66 while (evaluateCondition(frame)) { |
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67 try { |
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68 /* Execute the loop body. */ |
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69 bodyNode.executeVoid(frame); |
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70 |
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71 if (CompilerDirectives.inInterpreter()) { |
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72 /* In the interpreter, profile the the number of loop iteration. */ |
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73 count++; |
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74 } |
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75 } catch (SLContinueException ex) { |
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76 /* In the interpreter, record profiling information that the loop uses continue. */ |
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77 continueTaken.enter(); |
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78 /* Fall through to next loop iteration. */ |
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79 } |
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80 } |
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81 } catch (SLBreakException ex) { |
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82 /* In the interpreter, record profiling information that the loop uses break. */ |
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83 breakTaken.enter(); |
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84 /* Done executing this loop, exit method to execute statement following the loop. */ |
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85 |
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86 } finally { |
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87 if (CompilerDirectives.inInterpreter()) { |
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88 /* |
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89 * In the interpreter, report the loop count to the Truffle system. It is used for |
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90 * compilation and inlining decisions. |
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91 */ |
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92 getRootNode().reportLoopCount(count); |
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93 } |
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94 } |
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95 } |
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96 |
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97 private boolean evaluateCondition(VirtualFrame frame) { |
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98 try { |
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99 /* |
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100 * The condition must evaluate to a boolean value, so we call the boolean-specialized |
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101 * execute method. |
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102 */ |
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103 return conditionNode.executeBoolean(frame); |
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104 } catch (UnexpectedResultException ex) { |
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105 /* |
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106 * The condition evaluated to a non-boolean result. This is a type error in the SL |
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107 * program. We report it with the same exception that Truffle DSL generated nodes use to |
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108 * report type errors. |
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109 */ |
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110 throw new UnsupportedSpecializationException(this, new Node[]{conditionNode}, ex.getResult()); |
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111 } |
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112 } |
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113 } |