Mercurial > hg > truffle
annotate truffle/com.oracle.truffle.api.profiles/src/com/oracle/truffle/api/profiles/LoopConditionProfile.java @ 22504:d80a5ff56f51
Storing the profiling enabled information in a static field; checking it only once; shielding against missing method in the TruffleRuntime interface
| author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
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| date | Thu, 17 Dec 2015 13:45:37 +0100 |
| parents | 828c67903db2 |
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| rev | line source |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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1 /* |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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4 * |
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Christian Humer <christian.humer@oracle.com>
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5 * This code is free software; you can redistribute it and/or modify it |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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6 * under the terms of the GNU General Public License version 2 only, as |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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7 * published by the Free Software Foundation. Oracle designates this |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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8 * particular file as subject to the "Classpath" exception as provided |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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9 * by Oracle in the LICENSE file that accompanied this code. |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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10 * |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
Christian Humer <christian.humer@oracle.com>
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15 * accompanied this code). |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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16 * |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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17 * You should have received a copy of the GNU General Public License version |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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20 * |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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22 * or visit www.oracle.com if you need additional information or have any |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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23 * questions. |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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24 */ |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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25 package com.oracle.truffle.api.profiles; |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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parents:
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26 |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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27 import com.oracle.truffle.api.CompilerDirectives; |
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28 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal; |
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29 |
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30 /** |
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31 * <p> |
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32 * LoopConditionProfiles are designed to profile the outcome of loop conditions. Loop profiles can |
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Extract profiles into separate package. Add isProfilingEnabled in TruffleRuntime to disable profiling in the default runtime; Add low overhead profiles for primitives; Add LoopConditionProfile; Profile footprint/threadsafety improvements; Make toString implementations more consistent; Greatly enhanced javadoc documentation for profiles; Deprecate old profiles
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33 * be used to profile unpredictable loops as well as predictable loops. |
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34 * </p> |
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35 * |
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36 * <p> |
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37 * <b> Arbitrary loop usage example: </b> |
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38 * |
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39 * <pre> |
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40 * class LoopNode extends Node { |
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41 * |
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42 * final LoopConditionProfile loopProfile = LoopConditionProfile.createCountingProfile(); |
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43 * |
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44 * void execute() { |
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45 * // loop count cannot be predicted |
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46 * while (loopProfile.profile(Math.random() >= 0.9)) { |
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47 * // work |
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48 * } |
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49 * } |
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50 * } |
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51 * </pre> |
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52 * |
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53 * </p> |
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54 * |
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55 * <p> |
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56 * <b> Counted loop usage example: </b> |
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57 * |
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58 * <pre> |
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59 * class CountedLoopNode extends Node { |
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60 * |
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61 * final LoopConditionProfile loopProfile = LoopConditionProfile.createCountingProfile(); |
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62 * |
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63 * void execute(int length) { |
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64 * // loop count can be predicted |
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65 * loopProfile.profileCounted(length); |
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66 * for (int i = 0; loopProfile.inject(i < length); i++) { |
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67 * // work |
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68 * } |
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69 * } |
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70 * } |
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71 * </pre> |
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72 * |
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73 * </p> |
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74 * <p> |
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75 * The advantage of using {@link #profileCounted(long)} to using {@link #profile(boolean)} is that |
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76 * it incurs less overhead in the interpreter. Using {@link LoopConditionProfile#inject(boolean)} is |
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77 * a no-op in the interpreter while {@link #profile(boolean)} needs to use a counter for each |
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78 * iteration. |
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79 * </p> |
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80 * |
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81 * |
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82 * {@inheritDoc} |
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83 * |
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84 * @see #createBinaryProfile() |
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85 * @see #createCountingProfile() |
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86 * @see LoopConditionProfile |
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87 */ |
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88 public abstract class LoopConditionProfile extends ConditionProfile { |
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89 |
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90 LoopConditionProfile() { |
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91 } |
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92 |
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93 @Override |
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94 public abstract boolean profile(boolean value); |
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95 |
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96 /** |
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97 * Provides an alternative way to profile counted loops with less interpreter footprint. Please |
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98 * see {@link LoopConditionProfile} for an usage example. |
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99 * |
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100 * @see #inject(boolean) |
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101 */ |
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102 public abstract void profileCounted(long length); |
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103 |
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104 /** |
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105 * Provides an alternative way to profile counted loops with less interpreter footprint. Please |
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106 * see {@link LoopConditionProfile} for an usage example. |
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107 * |
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108 * @see #inject(boolean) |
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109 */ |
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110 public abstract boolean inject(boolean condition); |
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111 |
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112 /** |
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113 * Returns a {@link LoopConditionProfile} that speculates on loop conditions to be never |
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114 * <code>true</code>. It also captures loop probabilities for the compiler. Loop condition |
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115 * profiles are intended to be used for loop conditions. |
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116 * |
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117 * @see LoopConditionProfile |
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118 */ |
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119 public static LoopConditionProfile createCountingProfile() { |
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120 if (Profile.isProfilingEnabled()) { |
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121 return Enabled.create(); |
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122 } else { |
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123 return Disabled.INSTANCE; |
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124 } |
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125 } |
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126 |
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127 static final class Enabled extends LoopConditionProfile { |
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128 |
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129 @CompilationFinal private long trueCount; // long for long running loops. |
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130 @CompilationFinal private int falseCount; |
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131 |
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132 @Override |
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133 public boolean profile(boolean condition) { |
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134 if (CompilerDirectives.inInterpreter()) { |
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135 if (condition) { |
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136 // local required to guarantee no overflow in multi-threaded environments |
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137 long localTrueCount = trueCount; |
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138 if (localTrueCount < Long.MAX_VALUE) { |
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139 trueCount = localTrueCount + 1; |
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140 } |
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141 } else { |
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142 // local required to guarantee no overflow in multi-threaded environments |
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143 int localFalseCount = falseCount; |
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144 if (localFalseCount < Integer.MAX_VALUE) { |
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145 falseCount = localFalseCount + 1; |
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146 } |
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147 } |
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148 // no branch probability calculation in the interpreter |
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149 return condition; |
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150 } else { |
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151 long trueCountLocal = trueCount; |
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152 int falseCountLocal = falseCount; |
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153 if (trueCountLocal == 0) { |
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154 /* Deopt for never entering the loop. */ |
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155 if (condition) { |
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156 CompilerDirectives.transferToInterpreterAndInvalidate(); |
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157 trueCount = trueCountLocal = 1; |
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158 } |
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159 } |
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160 /* No deopt for not entering the loop. */ |
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161 return CompilerDirectives.injectBranchProbability(calculateProbability(trueCountLocal, falseCountLocal), condition); |
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162 } |
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163 } |
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164 |
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165 @Override |
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166 public void profileCounted(long length) { |
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167 if (CompilerDirectives.inInterpreter()) { |
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168 long trueCountLocal = trueCount + length; |
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169 if (trueCountLocal >= 0) { // don't write overflow values |
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170 trueCount = trueCountLocal; |
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171 int falseCountLocal = falseCount; |
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172 if (falseCountLocal < Integer.MAX_VALUE) { |
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173 falseCount = falseCountLocal + 1; |
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174 } |
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175 } |
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176 } |
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177 } |
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178 |
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179 @Override |
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180 public boolean inject(boolean condition) { |
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181 if (CompilerDirectives.inCompiledCode()) { |
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182 return CompilerDirectives.injectBranchProbability(calculateProbability(trueCount, falseCount), condition); |
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183 } else { |
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184 return condition; |
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185 } |
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186 } |
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187 |
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188 private static double calculateProbability(long trueCountLocal, int falseCountLocal) { |
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189 if (falseCountLocal == 0 && trueCountLocal == 0) { |
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190 /* Avoid division by zero if profile was never used. */ |
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191 return 0.0; |
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192 } else { |
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193 return (double) trueCountLocal / (double) (trueCountLocal + falseCountLocal); |
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194 } |
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195 } |
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196 |
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197 /* for testing */ |
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198 long getTrueCount() { |
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199 return trueCount; |
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200 } |
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201 |
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202 /* for testing */ |
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203 int getFalseCount() { |
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204 return falseCount; |
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205 } |
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206 |
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207 @Override |
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208 public String toString() { |
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209 return toString(LoopConditionProfile.class, falseCount == 0, false, // |
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210 String.format("trueProbability=%s (trueCount=%s, falseCount=%s)", calculateProbability(trueCount, falseCount), falseCount, trueCount)); |
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211 } |
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212 |
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213 /* Needed for lazy class loading. */ |
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214 static LoopConditionProfile create() { |
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215 return new Enabled(); |
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216 } |
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217 |
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218 } |
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219 |
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220 static final class Disabled extends LoopConditionProfile { |
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221 |
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222 static final LoopConditionProfile INSTANCE = new Disabled(); |
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223 |
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224 @Override |
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225 protected Object clone() { |
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226 return INSTANCE; |
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227 } |
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228 |
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229 @Override |
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230 public boolean profile(boolean condition) { |
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231 return condition; |
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232 } |
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233 |
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234 @Override |
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235 public void profileCounted(long length) { |
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236 } |
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237 |
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238 @Override |
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239 public boolean inject(boolean condition) { |
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240 return condition; |
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241 } |
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242 |
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243 @Override |
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244 public String toString() { |
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245 return toStringDisabled(LoopConditionProfile.class); |
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246 } |
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247 |
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248 } |
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249 |
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250 } |