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annotate truffle/com.oracle.truffle.api.profiles/src/com/oracle/truffle/api/profiles/ByteValueProfile.java @ 22527:114a6a77b440

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Colorifying ByteValueProfile sample code
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 30 Dec 2015 15:33:13 +0100
parents d80a5ff56f51
children
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22501
a63bda98cfdb 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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2 * Copyright (c) 2015, 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
a63bda98cfdb 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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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
a63bda98cfdb 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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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
a63bda98cfdb 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,
a63bda98cfdb 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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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.profiles;
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26
a63bda98cfdb 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
a63bda98cfdb 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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30 /**
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31 * <p>
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32 * Specialized value profile to capture certain properties of <code>byte</code> runtime values.
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33 * Value profiles require a runtime check in their initialized state to verify their profiled
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34 * assumption. Value profiles are limited to capture monomorphic profiles only. This means that if
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35 * two or more values are profiled within a single profile then the profile has no effect. If the
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36 * value assumption is invalidated in compiled code then it is invalidated.
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37 * </p>
a63bda98cfdb 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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38 *
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39 * <p>
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40 * <b> Usage example: </b> {@codesnippet ByteValueProfileSample}
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41 *
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42 * {@inheritDoc}
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43 *
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44 * @see #createIdentityProfile()
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45 * @see ValueProfile
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46 */
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47 public abstract class ByteValueProfile extends Profile {
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48
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49 ByteValueProfile() {
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50 }
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51
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52 public abstract byte profile(byte value);
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53
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54 /**
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55 * Returns a value profile that profiles the exact value of a <code>byte</code>.
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56 *
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57 * @see ByteValueProfile
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58 */
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59 public static ByteValueProfile createIdentityProfile() {
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60 if (Profile.isProfilingEnabled()) {
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61 return Enabled.create();
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62 } else {
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63 return Disabled.INSTANCE;
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64 }
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65 }
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66
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67 static final class Enabled extends ByteValueProfile {
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68
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69 private static final byte UNINITIALIZED = 0;
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70 private static final byte SPECIALIZED = 1;
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71 private static final byte GENERIC = 2;
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72
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73 @CompilationFinal private byte cachedValue;
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74 @CompilationFinal private byte state = 0;
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75
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76 @Override
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77 public byte profile(byte value) {
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78 byte localState = this.state;
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79 if (localState != GENERIC) {
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80 if (localState == SPECIALIZED) {
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81 byte v = cachedValue;
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82 if (v == value) {
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83 return v;
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84 }
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85 }
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86 CompilerDirectives.transferToInterpreterAndInvalidate();
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87 if (localState == UNINITIALIZED) {
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88 this.cachedValue = value;
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89 this.state = SPECIALIZED;
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90 } else {
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91 this.state = GENERIC;
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92 }
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93 }
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94 return value;
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95 }
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96
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97 boolean isGeneric() {
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98 return state == GENERIC;
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99 }
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100
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101 boolean isUninitialized() {
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102 return state == UNINITIALIZED;
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103 }
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104
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105 byte getCachedValue() {
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106 return cachedValue;
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107 }
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108
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109 @Override
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110 public String toString() {
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111 return toString(ByteValueProfile.class, state == UNINITIALIZED, state == GENERIC, //
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112 String.format("value == (byte)%s", cachedValue));
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113 }
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114
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115 /* Needed for lazy class loading. */
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116 static ByteValueProfile create() {
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117 return new Enabled();
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118 }
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119 }
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120
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121 static final class Disabled extends ByteValueProfile {
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122
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123 static final ByteValueProfile INSTANCE = new Disabled();
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124
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125 @Override
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126 protected Object clone() {
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127 return INSTANCE;
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128 }
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129
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130 @Override
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131 public byte profile(byte value) {
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132 return value;
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133 }
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134
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135 @Override
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136 public String toString() {
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137 return toStringDisabled(ByteValueProfile.class);
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138 }
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139
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140 }
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141
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142 }