Mercurial > hg > truffle
annotate truffle/com.oracle.truffle.api.profiles/src/com/oracle/truffle/api/profiles/ConditionProfile.java @ 22503:828c67903db2
Moving profiles into their own project to ensure the core API doesn't reference these utility classes.
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
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date | Thu, 17 Dec 2015 10:01:38 +0100 |
parents | truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/profiles/ConditionProfile.java@a63bda98cfdb |
children | d80a5ff56f51 |
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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 |
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121 } |
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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
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Truffle: new condition profile primitives.
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242 } |