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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/profiles/ConditionProfile.java @ 22501:a63bda98cfdb

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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
author Christian Humer <christian.humer@oracle.com>
date Wed, 16 Dec 2015 16:38:13 +0100
parents truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/ConditionProfile.java@dc83cc1f94f2
children
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1 /*
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2 * Copyright (c) 2014, 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
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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.profiles;
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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.CompilerDirectives.CompilationFinal;
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29 import com.oracle.truffle.api.Truffle;
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30
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31 /**
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32 * <p>
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33 * ConditionProfiles are useful to profile the outcome of conditions.
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34 * </p>
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35 *
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36 * <p>
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37 * <b> Usage example: </b>
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38 *
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39 * <pre>
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40 * class AbsoluteNode extends Node {
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41 *
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42 * final ConditionProfile greaterZeroProfile = ConditionProfile.create{Binary,Counting}Profile();
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43 *
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44 * void execute(int value) {
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45 * if (greaterZeroProfile.profile(value >= 0)) {
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46 * return value;
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47 * } else {
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48 * return -value;
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49 * }
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50 * }
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51 * }
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52 * </pre>
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53 *
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54 * {@inheritDoc}
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55 *
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56 * @see #createBinaryProfile()
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57 * @see #createCountingProfile()
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58 * @see LoopConditionProfile
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59 */
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60 public abstract class ConditionProfile extends Profile {
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61
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62 ConditionProfile() {
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63 }
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64
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65 public abstract boolean profile(boolean value);
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66
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67 /**
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68 * Returns a {@link ConditionProfile} that speculates on conditions to be never
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69 * <code>true</code> or to be never <code>false</code>. Additionally to a binary profile this
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70 * method returns a condition profile that also counts the number of times the condition was
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71 * true and false. This information is reported to the underlying optimization system using
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72 * {@link CompilerDirectives#injectBranchProbability(double, boolean)}. Condition profiles are
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73 * intended to be used as part of if conditions.
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74 *
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75 * @see ConditionProfile
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76 * @see #createBinaryProfile()
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77 */
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78 public static ConditionProfile createCountingProfile() {
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79 if (Truffle.getRuntime().isProfilingEnabled()) {
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80 return Counting.create();
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81 } else {
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82 return Disabled.INSTANCE;
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83 }
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84 }
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85
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86 /**
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87 * Returns a {@link ConditionProfile} that speculates on conditions to be never
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88 * <code>true</code> or to be never <code>false</code>. Condition profiles are intended to be
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89 * used as part of if conditions.
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90 *
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91 * @see ConditionProfile
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92 * @see ConditionProfile#createCountingProfile()
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93 */
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94 public static ConditionProfile createBinaryProfile() {
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95 if (Truffle.getRuntime().isProfilingEnabled()) {
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96 return Binary.create();
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97 } else {
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98 return Disabled.INSTANCE;
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99 }
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100 }
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101
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102 static final class Disabled extends ConditionProfile {
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103
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104 static final ConditionProfile INSTANCE = new Disabled();
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105
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106 @Override
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107 protected Object clone() {
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108 return INSTANCE;
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109 }
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110
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111 @Override
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112 public boolean profile(boolean value) {
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113 return value;
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114 }
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115
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116 @Override
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117 public String toString() {
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118 return toStringDisabled(ConditionProfile.class);
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119 }
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120
16860
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121 }
22501
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122
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123 static final class Counting extends ConditionProfile {
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124
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125 @CompilationFinal private int trueCount;
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126 @CompilationFinal private int falseCount;
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127
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128 Counting() {
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129 /* package protected constructor */
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130 }
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131
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132 @Override
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133 public boolean profile(boolean value) {
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134 if (CompilerDirectives.inInterpreter()) {
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135 if (value) {
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136 // local required to guarantee no overflow in multi-threaded environments
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137 int t = trueCount;
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138 if (t < Integer.MAX_VALUE) {
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139 trueCount = t + 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 f = falseCount;
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144 if (f < Integer.MAX_VALUE) {
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145 falseCount = f + 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 value;
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150 } else {
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151 // use trueCount and falseCount as locals for compilation speed
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152 int t = trueCount;
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153 int f = falseCount;
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154 if (value) {
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155 if (t == 0) {
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156 CompilerDirectives.transferToInterpreterAndInvalidate();
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157 t = 1;
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158 }
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159 } else {
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160 if (f == 0) {
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161 CompilerDirectives.transferToInterpreterAndInvalidate();
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162 f = 1;
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163 }
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164 }
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165 return CompilerDirectives.injectBranchProbability((double) t / (double) (t + f), value);
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166 }
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167 }
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168
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169 int getTrueCount() {
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170 return trueCount;
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171 }
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172
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173 int getFalseCount() {
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174 return falseCount;
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175 }
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176
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177 @Override
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178 public String toString() {
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179 int t = trueCount;
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180 int f = falseCount;
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181 return toString(ConditionProfile.class, trueCount == 0 && falseCount == 0, false, //
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182 String.format("trueProbability=%s (trueCount=%s, falseCount=%s)", (double) t / (double) (t + f), t, f));
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183 }
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184
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185 /* Needed for lazy class loading. */
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186 static ConditionProfile create() {
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187 return new Counting();
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188 }
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189 }
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190
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191 /**
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192 * Utility class to speculate on conditions to be never true or to be never false. Condition
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193 * profiles are intended to be used as part of if conditions.
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194 *
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195 * @see ConditionProfile#createBinaryProfile()
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196 */
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197 static final class Binary extends ConditionProfile {
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198
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199 @CompilationFinal private boolean wasTrue;
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200 @CompilationFinal private boolean wasFalse;
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201
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202 Binary() {
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203 /* package protected constructor */
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204 }
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205
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206 @Override
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207 public boolean profile(boolean value) {
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208 if (value) {
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209 if (!wasTrue) {
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210 CompilerDirectives.transferToInterpreterAndInvalidate();
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211 wasTrue = true;
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212 }
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213 return true;
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214 } else {
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215 if (!wasFalse) {
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216 CompilerDirectives.transferToInterpreterAndInvalidate();
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217 wasFalse = true;
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218 }
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219 return false;
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220 }
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221 }
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222
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223 boolean wasTrue() {
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224 return wasTrue;
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225 }
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226
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227 boolean wasFalse() {
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228 return wasFalse;
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229 }
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230
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231 @Override
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232 public String toString() {
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233 return String.format("%s(wasTrue=%s, wasFalse=%s)@%x", getClass().getSimpleName(), wasTrue, wasFalse, hashCode());
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234 }
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235
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236 /* Needed for lazy class loading. */
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237 static ConditionProfile create() {
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238 return new Binary();
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239 }
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240 }
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241
16828
2834af86f398 Truffle: new condition profile primitives.
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242 }