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annotate truffle/com.oracle.truffle.api.profiles/src/com/oracle/truffle/api/profiles/ConditionProfile.java @ 22504:d80a5ff56f51

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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>
date Thu, 17 Dec 2015 13:45:37 +0100
parents 828c67903db2
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
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30 /**
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31 * <p>
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32 * ConditionProfiles are useful to profile the outcome of conditions.
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33 * </p>
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34 *
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35 * <p>
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36 * <b> Usage example: </b>
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37 *
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38 * <pre>
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39 * class AbsoluteNode extends Node {
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40 *
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41 * final ConditionProfile greaterZeroProfile = ConditionProfile.create{Binary,Counting}Profile();
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42 *
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43 * void execute(int value) {
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44 * if (greaterZeroProfile.profile(value >= 0)) {
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45 * return value;
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46 * } else {
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47 * return -value;
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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 * {@inheritDoc}
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54 *
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55 * @see #createBinaryProfile()
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56 * @see #createCountingProfile()
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57 * @see LoopConditionProfile
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58 */
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59 public abstract class ConditionProfile extends Profile {
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60
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61 ConditionProfile() {
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62 }
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63
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64 public abstract boolean profile(boolean value);
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65
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66 /**
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67 * Returns a {@link ConditionProfile} that speculates on conditions to be never
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68 * <code>true</code> or to be never <code>false</code>. Additionally to a binary profile this
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69 * method returns a condition profile that also counts the number of times the condition was
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70 * true and false. This information is reported to the underlying optimization system using
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71 * {@link CompilerDirectives#injectBranchProbability(double, boolean)}. Condition profiles are
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72 * intended to be used as part of if conditions.
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73 *
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74 * @see ConditionProfile
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75 * @see #createBinaryProfile()
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76 */
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77 public static ConditionProfile createCountingProfile() {
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78 if (Profile.isProfilingEnabled()) {
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79 return Counting.create();
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80 } else {
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81 return Disabled.INSTANCE;
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82 }
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83 }
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84
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85 /**
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86 * Returns a {@link ConditionProfile} that speculates on conditions to be never
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87 * <code>true</code> or to be never <code>false</code>. Condition profiles are intended to be
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88 * used as part of if conditions.
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89 *
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90 * @see ConditionProfile
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91 * @see ConditionProfile#createCountingProfile()
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92 */
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93 public static ConditionProfile createBinaryProfile() {
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94 if (Profile.isProfilingEnabled()) {
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95 return Binary.create();
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96 } else {
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97 return Disabled.INSTANCE;
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98 }
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99 }
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100
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101 static final class Disabled extends ConditionProfile {
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102
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103 static final ConditionProfile INSTANCE = new Disabled();
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104
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105 @Override
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106 protected Object clone() {
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107 return INSTANCE;
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108 }
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109
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110 @Override
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111 public boolean profile(boolean value) {
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112 return value;
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113 }
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114
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115 @Override
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116 public String toString() {
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117 return toStringDisabled(ConditionProfile.class);
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118 }
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119
16860
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120 }
22501
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121
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122 static final class Counting extends ConditionProfile {
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123
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124 @CompilationFinal private int trueCount;
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125 @CompilationFinal private int falseCount;
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126
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127 Counting() {
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128 /* package protected constructor */
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129 }
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130
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131 @Override
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132 public boolean profile(boolean value) {
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133 if (CompilerDirectives.inInterpreter()) {
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134 if (value) {
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135 // local required to guarantee no overflow in multi-threaded environments
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136 int t = trueCount;
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137 if (t < Integer.MAX_VALUE) {
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138 trueCount = t + 1;
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139 }
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140 } else {
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141 // local required to guarantee no overflow in multi-threaded environments
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142 int f = falseCount;
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143 if (f < Integer.MAX_VALUE) {
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144 falseCount = f + 1;
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145 }
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146 }
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147 // no branch probability calculation in the interpreter
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148 return value;
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149 } else {
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150 // use trueCount and falseCount as locals for compilation speed
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151 int t = trueCount;
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152 int f = falseCount;
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153 if (value) {
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154 if (t == 0) {
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155 CompilerDirectives.transferToInterpreterAndInvalidate();
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156 t = 1;
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157 }
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158 } else {
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159 if (f == 0) {
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160 CompilerDirectives.transferToInterpreterAndInvalidate();
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161 f = 1;
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162 }
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163 }
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164 return CompilerDirectives.injectBranchProbability((double) t / (double) (t + f), value);
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165 }
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166 }
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167
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168 int getTrueCount() {
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169 return trueCount;
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170 }
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171
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172 int getFalseCount() {
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173 return falseCount;
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174 }
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175
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176 @Override
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177 public String toString() {
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178 int t = trueCount;
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179 int f = falseCount;
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180 return toString(ConditionProfile.class, trueCount == 0 && falseCount == 0, false, //
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181 String.format("trueProbability=%s (trueCount=%s, falseCount=%s)", (double) t / (double) (t + f), t, f));
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182 }
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183
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184 /* Needed for lazy class loading. */
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185 static ConditionProfile create() {
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186 return new Counting();
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187 }
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188 }
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189
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190 /**
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191 * Utility class to speculate on conditions to be never true or to be never false. Condition
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192 * profiles are intended to be used as part of if conditions.
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193 *
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194 * @see ConditionProfile#createBinaryProfile()
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195 */
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196 static final class Binary extends ConditionProfile {
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197
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198 @CompilationFinal private boolean wasTrue;
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199 @CompilationFinal private boolean wasFalse;
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200
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201 Binary() {
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202 /* package protected constructor */
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203 }
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204
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205 @Override
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206 public boolean profile(boolean value) {
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207 if (value) {
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208 if (!wasTrue) {
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209 CompilerDirectives.transferToInterpreterAndInvalidate();
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210 wasTrue = true;
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211 }
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212 return true;
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213 } else {
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214 if (!wasFalse) {
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215 CompilerDirectives.transferToInterpreterAndInvalidate();
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216 wasFalse = true;
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217 }
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218 return false;
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219 }
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220 }
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221
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222 boolean wasTrue() {
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223 return wasTrue;
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224 }
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225
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226 boolean wasFalse() {
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227 return wasFalse;
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228 }
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229
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230 @Override
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231 public String toString() {
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232 return String.format("%s(wasTrue=%s, wasFalse=%s)@%x", getClass().getSimpleName(), wasTrue, wasFalse, hashCode());
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233 }
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234
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235 /* Needed for lazy class loading. */
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236 static ConditionProfile create() {
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237 return new Binary();
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238 }
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239 }
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240
16828
2834af86f398 Truffle: new condition profile primitives.
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241 }