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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/BooleanConditionProfile.java @ 16828:2834af86f398
Truffle: new condition profile primitives.
author | Christian Humer <christian.humer@gmail.com> |
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date | Wed, 13 Aug 2014 20:44:36 +0200 |
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1 /* |
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2 * Copyright (c) 2013, 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. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package com.oracle.truffle.api.utilities; |
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26 |
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27 import com.oracle.truffle.api.*; |
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28 import com.oracle.truffle.api.CompilerDirectives.*; |
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29 |
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30 /** |
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31 * Utility class to speculate on conditions to be never true or to be never false. Condition |
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32 * profiles are intended to be used as part of if conditions. |
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33 * |
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34 * Example usage: |
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35 * |
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36 * <pre> |
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37 * private final ConditionProfile zero = new BooleanConditionProfile(); |
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38 * |
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39 * int value = ...; |
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40 * if (zero.profile(value == 0)) { |
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41 * return 0; |
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42 * } else { |
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43 * return value; |
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44 * } |
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45 * |
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46 * </pre> |
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47 * |
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48 * @see ConditionProfile |
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49 * @see IntegerConditionProfile |
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50 */ |
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51 public class BooleanConditionProfile extends ConditionProfile { |
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52 |
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53 @CompilationFinal private boolean wasTrue; |
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54 @CompilationFinal private boolean wasFalse; |
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55 |
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56 @Override |
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57 public boolean profile(boolean value) { |
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58 if (value) { |
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59 if (!wasTrue) { |
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60 CompilerDirectives.transferToInterpreterAndInvalidate(); |
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61 wasTrue = true; |
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62 } |
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63 } else { |
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64 if (!wasFalse) { |
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65 CompilerDirectives.transferToInterpreterAndInvalidate(); |
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66 wasFalse = true; |
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67 } |
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68 } |
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69 return value; |
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70 } |
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71 |
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72 public boolean wasTrue() { |
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73 return wasTrue; |
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74 } |
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75 |
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76 public boolean wasFalse() { |
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77 return wasFalse; |
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78 } |
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79 |
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80 @Override |
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81 public String toString() { |
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82 return String.format("%s(wasTrue=%s, wasFalse=%s)@%x", getClass().getSimpleName(), wasTrue, wasFalse, hashCode()); |
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83 } |
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84 } |