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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/BinaryConditionProfile.java @ 16854:fc6f12ee71e5

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Truffle: fixed header dates.
author Christian Humer <christian.humer@gmail.com>
date Mon, 18 Aug 2014 19:02:18 +0200
parents 3c114b3e08c3
children fa5e62620593
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1 /*
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2 * Copyright (c) 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. 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 CountingConditionProfile
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50 */
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51 public class BinaryConditionProfile 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 }