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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/ConditionProfile.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 9c8c0937da41
children a63bda98cfdb
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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.CompilerDirectives;
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28 import com.oracle.truffle.api.nodes.NodeCloneable;
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29
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30 /**
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31 * Abstract utility class to speculate on conditions. Condition profiles are intended to be used as
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32 * 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 = ConditionProfile.createBinaryProfile();
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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 * All instances of {@code ConditionProfile} (and subclasses) must be held in {@code final} fields
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49 * for compiler optimizations to take effect.
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50 *
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51 * @see #createCountingProfile()
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52 * @see #createBinaryProfile()
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53 */
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54 public abstract class ConditionProfile extends NodeCloneable {
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55 ConditionProfile() {
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56 }
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57
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58 public abstract boolean profile(boolean value);
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59
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60 /**
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61 * Returns a {@link ConditionProfile} that speculates on conditions to be never
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62 * <code>true</code> or to be never <code>false</code>. Additionally to a binary profile this
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63 * method returns a condition profile that also counts the number of times the condition was
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64 * true and false. This information is reported to the underlying optimization system using
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65 * {@link CompilerDirectives#injectBranchProbability(double, boolean)}. Condition profiles are
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66 * intended to be used as part of if conditions.
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67 *
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68 * @see ConditionProfile
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69 * @see #createBinaryProfile()
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70 */
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71 public static ConditionProfile createCountingProfile() {
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72 return new CountingConditionProfile();
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73 }
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74
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75 /**
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76 * Returns a {@link ConditionProfile} that speculates on conditions to be never true or to be
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77 * never false. Condition profiles are intended to be used as part of if conditions.
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78 *
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79 * @see ConditionProfile
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80 * @see ConditionProfile#createCountingProfile()
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81 */
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82 public static ConditionProfile createBinaryProfile() {
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83 return new BinaryConditionProfile();
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84 }
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85 }