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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/PrimitiveValueProfile.java @ 20131:4b12d5355811
Truffle: do not use iterators for visitors.
author | Christian Humer <christian.humer@gmail.com> |
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date | Thu, 02 Apr 2015 01:27:27 +0200 |
parents | 126ab00f859c |
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rev | line source |
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1 /* |
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2 * Copyright (c) 2014, 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.utilities; |
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26 |
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27 import java.util.*; |
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28 |
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29 import com.oracle.truffle.api.*; |
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30 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal; |
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31 |
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32 /** |
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33 * Represents a {@link ValueProfile} that speculates on the primitive equality or object identity of |
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34 * values. |
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35 * <p> |
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36 * Note that for {@code float} and {@code double} values we compare primitive equality via |
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37 * {@link Float#floatToRawIntBits} and {@link Double#doubleToRawLongBits}, so that for example |
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38 * {@code -0.0} is not considered the same as {@code 0.0}, even though primitive equality would |
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39 * normally say that it was. |
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40 */ |
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41 public class PrimitiveValueProfile extends ValueProfile { |
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42 |
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43 private static final Object UNINITIALIZED = new Object(); |
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44 private static final Object GENERIC = new Object(); |
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45 |
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46 @CompilationFinal private Object cachedValue = UNINITIALIZED; |
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47 |
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48 PrimitiveValueProfile() { |
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49 } |
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50 |
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51 @SuppressWarnings("unchecked") |
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52 @Override |
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53 public Object profile(Object value) { |
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54 Object snapshot = this.cachedValue; |
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55 if (snapshot != GENERIC) { |
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56 if (snapshot instanceof Byte) { |
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57 if (value instanceof Byte && (byte) snapshot == (byte) value) { |
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58 return snapshot; |
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59 } |
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60 } else if (snapshot instanceof Short) { |
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61 if (value instanceof Short && (short) snapshot == (short) value) { |
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62 return snapshot; |
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63 } |
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64 } else if (snapshot instanceof Integer) { |
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65 if (value instanceof Integer && (int) snapshot == (int) value) { |
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66 return snapshot; |
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67 } |
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68 } else if (snapshot instanceof Long) { |
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69 if (value instanceof Long && (long) snapshot == (long) value) { |
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70 return snapshot; |
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71 } |
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72 } else if (snapshot instanceof Float) { |
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73 if (value instanceof Float && exactCompare((float) snapshot, (float) value)) { |
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74 return snapshot; |
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75 } |
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76 } else if (snapshot instanceof Double) { |
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77 if (value instanceof Double && exactCompare((double) snapshot, (double) value)) { |
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78 return snapshot; |
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79 } |
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80 } else if (snapshot instanceof Boolean) { |
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81 if (value instanceof Boolean && (boolean) snapshot == (boolean) value) { |
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82 return snapshot; |
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83 } |
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84 } else if (snapshot instanceof Character) { |
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85 if (value instanceof Character && (char) snapshot == (char) value) { |
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86 return snapshot; |
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87 } |
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88 } else if (snapshot == value) { |
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89 return snapshot; |
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90 } |
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91 cacheMiss(value); |
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92 } |
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93 return value; |
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94 } |
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95 |
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96 public byte profile(byte value) { |
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97 Object snapshot = this.cachedValue; |
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98 if (snapshot != GENERIC) { |
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99 if (snapshot instanceof Byte && (byte) snapshot == value) { |
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100 return (byte) snapshot; |
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101 } else { |
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102 cacheMiss(value); |
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103 } |
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104 } |
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105 return value; |
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106 } |
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107 |
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108 public short profile(short value) { |
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109 Object snapshot = this.cachedValue; |
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110 if (snapshot != GENERIC) { |
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111 if (snapshot instanceof Short && (short) snapshot == value) { |
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112 return (short) snapshot; |
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113 } else { |
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114 cacheMiss(value); |
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115 } |
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116 } |
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117 return value; |
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118 } |
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119 |
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120 public int profile(int value) { |
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121 Object snapshot = this.cachedValue; |
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122 if (snapshot != GENERIC) { |
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123 if (snapshot instanceof Integer && (int) snapshot == value) { |
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124 return (int) snapshot; |
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125 } else { |
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126 cacheMiss(value); |
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127 } |
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128 } |
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129 return value; |
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130 } |
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131 |
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132 public long profile(long value) { |
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133 Object snapshot = this.cachedValue; |
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134 if (snapshot != GENERIC) { |
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135 if (snapshot instanceof Long && (long) snapshot == value) { |
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136 return (long) snapshot; |
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137 } else { |
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138 cacheMiss(value); |
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139 } |
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140 } |
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141 return value; |
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142 } |
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143 |
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144 public float profile(float value) { |
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145 Object snapshot = this.cachedValue; |
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146 if (snapshot != GENERIC) { |
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147 if (snapshot instanceof Float && exactCompare((float) snapshot, value)) { |
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148 return (float) snapshot; |
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149 } else { |
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150 cacheMiss(value); |
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151 } |
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152 } |
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153 return value; |
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154 } |
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155 |
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156 public double profile(double value) { |
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157 Object snapshot = this.cachedValue; |
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158 if (snapshot != GENERIC) { |
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159 if (snapshot instanceof Double && exactCompare((double) snapshot, value)) { |
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160 return (double) snapshot; |
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161 } else { |
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162 cacheMiss(value); |
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163 } |
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164 } |
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165 return value; |
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166 } |
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167 |
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168 public boolean profile(boolean value) { |
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169 Object snapshot = this.cachedValue; |
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170 if (snapshot != GENERIC) { |
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171 if (snapshot instanceof Boolean && (boolean) snapshot == value) { |
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172 return (boolean) snapshot; |
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173 } else { |
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174 cacheMiss(value); |
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175 } |
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176 } |
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177 return value; |
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178 } |
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179 |
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180 public char profile(char value) { |
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181 Object snapshot = this.cachedValue; |
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182 if (snapshot != GENERIC) { |
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183 if (snapshot instanceof Character && (char) snapshot == value) { |
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184 return (char) snapshot; |
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185 } else { |
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186 cacheMiss(value); |
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187 } |
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188 } |
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189 return value; |
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190 } |
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191 |
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192 public boolean isGeneric() { |
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193 return cachedValue == GENERIC; |
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194 } |
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195 |
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196 public boolean isUninitialized() { |
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197 return cachedValue == UNINITIALIZED; |
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198 } |
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199 |
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200 public Object getCachedValue() { |
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201 return cachedValue; |
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202 } |
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203 |
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204 @Override |
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205 public String toString() { |
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206 return String.format("%s(%s)@%x", getClass().getSimpleName(), formatValue(), hashCode()); |
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207 } |
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208 |
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209 private void cacheMiss(Object value) { |
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210 // TODO should we try to handle this more atomically? |
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211 CompilerDirectives.transferToInterpreterAndInvalidate(); |
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212 if (cachedValue == UNINITIALIZED) { |
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213 cachedValue = value; |
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214 } else { |
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215 cachedValue = GENERIC; |
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216 } |
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217 } |
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218 |
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219 public static boolean exactCompare(float a, float b) { |
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220 /* |
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221 * -0.0 == 0.0, but you can tell the difference through other means, so we need to |
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222 * differentiate. |
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223 */ |
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224 return Float.floatToRawIntBits(a) == Float.floatToRawIntBits(b); |
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225 } |
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226 |
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227 public static boolean exactCompare(double a, double b) { |
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228 /* |
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229 * -0.0 == 0.0, but you can tell the difference through other means, so we need to |
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230 * differentiate. |
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231 */ |
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232 return Double.doubleToRawLongBits(a) == Double.doubleToRawLongBits(b); |
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233 } |
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234 |
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235 private String formatValue() { |
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236 Object snapshot = this.cachedValue; |
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237 if (snapshot == null) { |
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238 return "null"; |
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239 } else if (snapshot == UNINITIALIZED) { |
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240 return "uninitialized"; |
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241 } else if (snapshot == GENERIC) { |
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242 return "generic"; |
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243 } else if (snapshot instanceof Byte || snapshot instanceof Short || snapshot instanceof Integer || snapshot instanceof Long || snapshot instanceof Float || snapshot instanceof Double || |
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244 snapshot instanceof Boolean || snapshot instanceof Character) { |
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PrimitiveValueProfile: read from a snapshot to avoid races with multiple reads.
Benoit Daloze <benoit.daloze@jku.at>
parents:
18769
diff
changeset
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245 return String.format("%s=%s", snapshot.getClass().getSimpleName(), snapshot); |
18164
53afdc71b311
Truffle: added PrimitiveValueProfile.
Chris Seaton <chris.seaton@oracle.com>
parents:
diff
changeset
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246 } else { |
19599
bc3cd000d9c8
PrimitiveValueProfile: read from a snapshot to avoid races with multiple reads.
Benoit Daloze <benoit.daloze@jku.at>
parents:
18769
diff
changeset
|
247 return String.format("%s@%x", snapshot.getClass().getSimpleName(), Objects.hash(snapshot)); |
18164
53afdc71b311
Truffle: added PrimitiveValueProfile.
Chris Seaton <chris.seaton@oracle.com>
parents:
diff
changeset
|
248 } |
53afdc71b311
Truffle: added PrimitiveValueProfile.
Chris Seaton <chris.seaton@oracle.com>
parents:
diff
changeset
|
249 } |
53afdc71b311
Truffle: added PrimitiveValueProfile.
Chris Seaton <chris.seaton@oracle.com>
parents:
diff
changeset
|
250 } |