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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/ConditionProfile.java @ 16860:fa5e62620593

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Truffle: made constructors of condition profiles package protected to delegate them later to TruffleRuntime.
author Christian Humer <christian.humer@gmail.com>
date Tue, 19 Aug 2014 14:56:19 +0200
parents fc6f12ee71e5
children db090a8d3705
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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
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29 /**
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30 * Abstract utility class to speculate on conditions. Condition profiles are intended to be used as
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31 * part of if conditions.
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32 *
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33 * Example usage:
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34 *
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35 * <pre>
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36 * private final ConditionProfile zero = ConditionProfile.createBinaryProfile();
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37 *
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38 * int value = ...;
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39 * if (zero.profile(value == 0)) {
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40 * return 0;
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41 * } else {
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42 * return value;
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43 * }
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44 *
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45 * </pre>
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46 *
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47 * @see #createCountingProfile()
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48 * @see #createBinaryProfile()
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49 */
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50 public abstract class ConditionProfile {
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51
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52 public abstract boolean profile(boolean value);
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53
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54 /**
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55 * Returns a {@link ConditionProfile} that speculates on conditions to be never
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56 * <code>true</code> or to be never <code>false</code>. Additionally to a binary profile this
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57 * method returns a condition profile that also counts the number of times the condition was
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58 * true and false. This information is reported to the underlying optimization system using
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59 * {@link CompilerDirectives#injectBranchProbability(double, boolean)}. Condition profiles are
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60 * intended to be used as part of if conditions.
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61 *
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62 * @see ConditionProfile
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63 * @see #createBinaryProfile()
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64 */
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65 public static CountingConditionProfile createCountingProfile() {
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66 return new CountingConditionProfile();
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67 }
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68
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69 /**
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70 * REturns a {@link ConditionProfile} that speculates on conditions to be never true or to be
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71 * never false. Condition profiles are intended to be used as part of if conditions.
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72 *
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73 * @see ConditionProfile
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74 * @see ConditionProfile#createBinaryProfile()
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75 */
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76 public static BinaryConditionProfile createBinaryProfile() {
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77 return new BinaryConditionProfile();
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78 }
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79
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80 }