Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/CompilerDirectives.java @ 15262:cd51b1253c4c
replaced the link between a HotSpotResolvedJavaMethod and a SpeculationLog with a ClassValue based mechanism (GRAAL-727)
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 22 Apr 2014 15:46:06 +0200 |
parents | df724f63f776 |
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1 /* |
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2 * Copyright (c) 2013, 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; |
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26 |
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27 import java.lang.annotation.*; |
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28 import java.lang.reflect.*; |
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29 import java.util.concurrent.*; |
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30 |
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31 import sun.misc.*; |
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32 |
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33 import com.oracle.truffle.api.frame.*; |
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34 |
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35 /** |
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36 * Directives that influence the optimizations of the Truffle compiler. All of the operations have |
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37 * no effect when executed in the Truffle interpreter. |
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38 */ |
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39 public final class CompilerDirectives { |
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40 |
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41 public static final double LIKELY_PROBABILITY = 0.75; |
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42 public static final double UNLIKELY_PROBABILITY = 1.0 - LIKELY_PROBABILITY; |
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43 |
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44 public static final double SLOWPATH_PROBABILITY = 0.0001; |
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45 public static final double FASTPATH_PROBABILITY = 1.0 - SLOWPATH_PROBABILITY; |
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46 |
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47 private static final Unsafe UNSAFE = getUnsafe(); |
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48 |
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49 private static Unsafe getUnsafe() { |
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50 try { |
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51 return Unsafe.getUnsafe(); |
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52 } catch (SecurityException e) { |
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53 } |
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54 try { |
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55 Field theUnsafeInstance = Unsafe.class.getDeclaredField("theUnsafe"); |
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56 theUnsafeInstance.setAccessible(true); |
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57 return (Unsafe) theUnsafeInstance.get(Unsafe.class); |
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58 } catch (Exception e) { |
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59 throw new RuntimeException("exception while trying to get Unsafe.theUnsafe via reflection:", e); |
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60 } |
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61 } |
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62 |
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63 /** |
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64 * Directive for the compiler to discontinue compilation at this code position and instead |
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65 * insert a transfer to the interpreter. |
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66 */ |
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67 public static void transferToInterpreter() { |
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68 } |
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69 |
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70 /** |
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71 * Directive for the compiler to discontinue compilation at this code position and instead |
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72 * insert a transfer to the interpreter, invalidating the currently executing machine code. |
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73 */ |
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74 public static void transferToInterpreterAndInvalidate() { |
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75 } |
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76 |
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77 /** |
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78 * Returns a boolean value indicating whether the method is executed in the interpreter. |
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79 * |
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80 * @return {@code true} when executed in the interpreter, {@code false} in compiled code. |
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81 */ |
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82 public static boolean inInterpreter() { |
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83 return true; |
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84 } |
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85 |
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86 /** |
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87 * Returns a boolean value indicating whether the method is executed in the compiled code. |
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88 * |
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89 * @return {@code false} when executed in the interpreter, {@code true} in compiled code. |
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90 */ |
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91 public static boolean inCompiledCode() { |
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92 return false; |
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93 } |
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94 |
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95 /** |
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96 * Directive for the compiler that the given runnable should only be executed in the interpreter |
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97 * and ignored in the compiled code. |
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98 * |
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99 * @param runnable the closure that should only be executed in the interpreter |
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100 */ |
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101 public static void interpreterOnly(Runnable runnable) { |
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102 runnable.run(); |
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103 } |
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104 |
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105 /** |
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106 * Directive for the compiler that the given callable should only be executed in the |
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107 * interpreter. |
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108 * |
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109 * @param callable the closure that should only be executed in the interpreter |
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110 * @return the result of executing the closure in the interpreter and null in the compiled code |
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111 * @throws Exception If the closure throws an exception when executed in the interpreter. |
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112 */ |
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113 public static <T> T interpreterOnly(Callable<T> callable) throws Exception { |
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114 return callable.call(); |
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115 } |
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116 |
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117 /** |
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118 * Injects a probability for the given condition into the probability information of the |
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119 * immediately succeeding branch instruction for the condition. The probability must be a value |
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120 * between 0.0 and 1.0 (inclusive). The condition should not be a combined condition. |
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121 * |
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122 * Example usage immediately before an if statement (it specifies that the likelihood for a to |
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123 * be greater than b is 90%): |
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124 * |
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125 * <code> |
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127 * // ... |
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128 * } |
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129 * </code> |
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130 * |
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131 * Example usage for a combined condition (it specifies that the likelihood for a to be greater |
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132 * than b is 90% and under the assumption that this is true, the likelihood for a being 0 is |
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133 * 10%): |
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134 * |
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135 * <code> |
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137 * // ... |
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138 * } |
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139 * </code> |
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140 * |
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141 * There are predefined constants for commonly used probabilities (see |
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142 * {@link #LIKELY_PROBABILITY} , {@link #UNLIKELY_PROBABILITY}, {@link #SLOWPATH_PROBABILITY}, |
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143 * {@link #FASTPATH_PROBABILITY} ). |
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144 * |
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145 * @param probability the probability value between 0.0 and 1.0 that should be injected |
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146 */ |
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147 public static boolean injectBranchProbability(double probability, boolean condition) { |
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148 assert probability >= 0.0 && probability <= 1.0; |
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149 return condition; |
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150 } |
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151 |
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152 /** |
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153 * Bails out of a compilation (e.g., for guest language features that should never be compiled). |
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154 * |
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155 * @param reason the reason for the bailout |
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156 */ |
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157 public static void bailout(String reason) { |
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158 } |
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159 |
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160 /** |
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161 * Marks fields that should be considered final for a Truffle compilation although they are not |
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162 * final while executing in the interpreter. |
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163 */ |
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164 @Retention(RetentionPolicy.RUNTIME) |
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165 @Target({ElementType.FIELD}) |
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166 public @interface CompilationFinal { |
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167 } |
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168 |
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169 /** |
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170 * Casts the given value to the value of the given type without any checks. The class must |
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171 * evaluate to a constant. The condition parameter gives a hint to the compiler under which |
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172 * circumstances this cast can be moved to an earlier location in the program. |
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173 * |
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174 * @param value the value that is known to have the specified type |
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175 * @param type the specified new type of the value |
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176 * @param condition the condition that makes this cast safe also at an earlier location of the |
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177 * program |
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178 * @return the value to be casted to the new type |
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179 */ |
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180 public static <T> T unsafeCast(Object value, Class<T> type, boolean condition) { |
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181 return unsafeCast(value, type, condition, false); |
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182 } |
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183 |
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184 /** |
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185 * Casts the given value to the value of the given type without any checks. The class must |
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186 * evaluate to a constant. The condition parameter gives a hint to the compiler under which |
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187 * circumstances this cast can be moved to an earlier location in the program. |
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188 * |
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189 * @param value the value that is known to have the specified type |
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190 * @param type the specified new type of the value |
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191 * @param condition the condition that makes this cast safe also at an earlier location of the |
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192 * program |
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193 * @param nonNull whether value is known to never be null |
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194 * @return the value to be casted to the new type |
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195 */ |
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196 @SuppressWarnings("unchecked") |
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197 public static <T> T unsafeCast(Object value, Class<T> type, boolean condition, boolean nonNull) { |
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198 return (T) value; |
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199 } |
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200 |
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201 /** |
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202 * Asserts that this value is not null and retrieved from a call to Frame.materialize. |
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203 * |
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204 * @param value the value that is known to have been obtained via Frame.materialize |
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205 * @return the value to be casted to the new type |
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206 */ |
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207 public static MaterializedFrame unsafeFrameCast(MaterializedFrame value) { |
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208 return unsafeCast(value, getUnsafeFrameType(), true, true); |
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209 } |
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210 |
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211 private static Class<? extends MaterializedFrame> getUnsafeFrameType() { |
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212 return MaterializedFrame.class; |
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213 } |
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214 |
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215 /** |
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216 * Unsafe access to a boolean value within an object. The condition parameter gives a hint to |
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217 * the compiler under which circumstances this access can be moved to an earlier location in the |
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218 * program. The location identity gives a hint to the compiler for improved global value |
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219 * numbering. |
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220 * |
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221 * @param receiver the object that is accessed |
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222 * @param offset the offset at which to access the object in bytes |
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223 * @param condition the condition that makes this access safe also at an earlier location in the |
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224 * program |
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225 * @param locationIdentity the location identity token that can be used for improved global |
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226 * value numbering or null |
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227 * @return the accessed value |
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228 */ |
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229 public static boolean unsafeGetBoolean(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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230 return UNSAFE.getBoolean(receiver, offset); |
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231 } |
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232 |
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233 /** |
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234 * Unsafe access to a byte value within an object. The condition parameter gives a hint to the |
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235 * compiler under which circumstances this access can be moved to an earlier location in the |
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236 * program. The location identity gives a hint to the compiler for improved global value |
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237 * numbering. |
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238 * |
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239 * @param receiver the object that is accessed |
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240 * @param offset the offset at which to access the object in bytes |
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241 * @param condition the condition that makes this access safe also at an earlier location in the |
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242 * program |
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243 * @param locationIdentity the location identity token that can be used for improved global |
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244 * value numbering or null |
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245 * @return the accessed value |
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246 */ |
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247 public static byte unsafeGetByte(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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248 return UNSAFE.getByte(receiver, offset); |
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249 } |
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250 |
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251 /** |
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252 * Unsafe access to a short value within an object. The condition parameter gives a hint to the |
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253 * compiler under which circumstances this access can be moved to an earlier location in the |
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254 * program. The location identity gives a hint to the compiler for improved global value |
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255 * numbering. |
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256 * |
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257 * @param receiver the object that is accessed |
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258 * @param offset the offset at which to access the object in bytes |
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259 * @param condition the condition that makes this access safe also at an earlier location in the |
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260 * program |
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261 * @param locationIdentity the location identity token that can be used for improved global |
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262 * value numbering or null |
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263 * @return the accessed value |
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264 */ |
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265 public static short unsafeGetShort(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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266 return UNSAFE.getShort(receiver, offset); |
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267 } |
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268 |
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269 /** |
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270 * Unsafe access to an int value within an object. The condition parameter gives a hint to the |
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271 * compiler under which circumstances this access can be moved to an earlier location in the |
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272 * program. The location identity gives a hint to the compiler for improved global value |
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273 * numbering. |
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274 * |
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275 * @param receiver the object that is accessed |
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276 * @param offset the offset at which to access the object in bytes |
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277 * @param condition the condition that makes this access safe also at an earlier location in the |
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278 * program |
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279 * @param locationIdentity the location identity token that can be used for improved global |
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280 * value numbering or null |
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281 * @return the accessed value |
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282 */ |
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283 public static int unsafeGetInt(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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284 return UNSAFE.getInt(receiver, offset); |
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285 } |
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286 |
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287 /** |
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288 * Unsafe access to a long value within an object. The condition parameter gives a hint to the |
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289 * compiler under which circumstances this access can be moved to an earlier location in the |
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290 * program. The location identity gives a hint to the compiler for improved global value |
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291 * numbering. |
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292 * |
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293 * @param receiver the object that is accessed |
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294 * @param offset the offset at which to access the object in bytes |
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295 * @param condition the condition that makes this access safe also at an earlier location in the |
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296 * program |
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297 * @param locationIdentity the location identity token that can be used for improved global |
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298 * value numbering or null |
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299 * @return the accessed value |
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300 */ |
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301 public static long unsafeGetLong(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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302 return UNSAFE.getLong(receiver, offset); |
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303 } |
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304 |
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305 /** |
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306 * Unsafe access to a float value within an object. The condition parameter gives a hint to the |
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307 * compiler under which circumstances this access can be moved to an earlier location in the |
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308 * program. The location identity gives a hint to the compiler for improved global value |
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309 * numbering. |
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310 * |
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311 * @param receiver the object that is accessed |
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312 * @param offset the offset at which to access the object in bytes |
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313 * @param condition the condition that makes this access safe also at an earlier location in the |
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314 * program |
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315 * @param locationIdentity the location identity token that can be used for improved global |
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316 * value numbering or null |
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317 * @return the accessed value |
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318 */ |
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319 public static float unsafeGetFloat(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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320 return UNSAFE.getFloat(receiver, offset); |
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321 } |
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322 |
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323 /** |
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324 * Unsafe access to a double value within an object. The condition parameter gives a hint to the |
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325 * compiler under which circumstances this access can be moved to an earlier location in the |
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326 * program. The location identity gives a hint to the compiler for improved global value |
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327 * numbering. |
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328 * |
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329 * @param receiver the object that is accessed |
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330 * @param offset the offset at which to access the object in bytes |
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331 * @param condition the condition that makes this access safe also at an earlier location in the |
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332 * program |
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333 * @param locationIdentity the location identity token that can be used for improved global |
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334 * value numbering or null |
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335 * @return the accessed value |
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336 */ |
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337 public static double unsafeGetDouble(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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338 return UNSAFE.getDouble(receiver, offset); |
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339 } |
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340 |
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341 /** |
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342 * Unsafe access to an Object value within an object. The condition parameter gives a hint to |
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343 * the compiler under which circumstances this access can be moved to an earlier location in the |
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344 * program. The location identity gives a hint to the compiler for improved global value |
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345 * numbering. |
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346 * |
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347 * @param receiver the object that is accessed |
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348 * @param offset the offset at which to access the object in bytes |
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349 * @param condition the condition that makes this access safe also at an earlier location in the |
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350 * program |
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351 * @param locationIdentity the location identity token that can be used for improved global |
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352 * value numbering or null |
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353 * @return the accessed value |
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354 */ |
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355 public static Object unsafeGetObject(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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356 return UNSAFE.getObject(receiver, offset); |
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357 } |
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358 |
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359 /** |
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360 * Write a boolean value within an object. The location identity gives a hint to the compiler |
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361 * for improved global value numbering. |
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362 * |
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363 * @param receiver the object that is written to |
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364 * @param offset the offset at which to write to the object in bytes |
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365 * @param value the value to be written |
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366 * @param locationIdentity the location identity token that can be used for improved global |
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367 * value numbering or null |
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368 */ |
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369 public static void unsafePutBoolean(Object receiver, long offset, boolean value, Object locationIdentity) { |
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370 UNSAFE.putBoolean(receiver, offset, value); |
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371 } |
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372 |
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373 /** |
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374 * Write a byte value within an object. The location identity gives a hint to the compiler for |
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375 * improved global value numbering. |
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376 * |
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377 * @param receiver the object that is written to |
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378 * @param offset the offset at which to write to the object in bytes |
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379 * @param value the value to be written |
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380 * @param locationIdentity the location identity token that can be used for improved global |
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381 * value numbering or null |
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382 */ |
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383 public static void unsafePutByte(Object receiver, long offset, byte value, Object locationIdentity) { |
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384 UNSAFE.putByte(receiver, offset, value); |
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385 } |
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386 |
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387 /** |
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388 * Write a short value within an object. The location identity gives a hint to the compiler for |
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389 * improved global value numbering. |
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390 * |
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391 * @param receiver the object that is written to |
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392 * @param offset the offset at which to write to the object in bytes |
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393 * @param value the value to be written |
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394 * @param locationIdentity the location identity token that can be used for improved global |
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395 * value numbering or null |
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396 */ |
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397 public static void unsafePutShort(Object receiver, long offset, short value, Object locationIdentity) { |
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398 UNSAFE.putShort(receiver, offset, value); |
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399 } |
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400 |
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401 /** |
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402 * Write an int value within an object. The location identity gives a hint to the compiler for |
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403 * improved global value numbering. |
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404 * |
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405 * @param receiver the object that is written to |
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406 * @param offset the offset at which to write to the object in bytes |
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407 * @param value the value to be written |
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408 * @param locationIdentity the location identity token that can be used for improved global |
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409 * value numbering or null |
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410 */ |
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411 public static void unsafePutInt(Object receiver, long offset, int value, Object locationIdentity) { |
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412 UNSAFE.putInt(receiver, offset, value); |
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413 } |
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414 |
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415 /** |
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416 * Write a long value within an object. The location identity gives a hint to the compiler for |
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417 * improved global value numbering. |
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418 * |
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419 * @param receiver the object that is written to |
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420 * @param offset the offset at which to write to the object in bytes |
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421 * @param value the value to be written |
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422 * @param locationIdentity the location identity token that can be used for improved global |
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423 * value numbering or null |
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424 */ |
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425 public static void unsafePutLong(Object receiver, long offset, long value, Object locationIdentity) { |
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426 UNSAFE.putLong(receiver, offset, value); |
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427 } |
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428 |
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429 /** |
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430 * Write a float value within an object. The location identity gives a hint to the compiler for |
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431 * improved global value numbering. |
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432 * |
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433 * @param receiver the object that is written to |
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434 * @param offset the offset at which to write to the object in bytes |
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435 * @param value the value to be written |
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436 * @param locationIdentity the location identity token that can be used for improved global |
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437 * value numbering or null |
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438 */ |
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439 public static void unsafePutFloat(Object receiver, long offset, float value, Object locationIdentity) { |
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440 UNSAFE.putFloat(receiver, offset, value); |
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441 } |
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442 |
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443 /** |
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444 * Write a double value within an object. The location identity gives a hint to the compiler for |
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445 * improved global value numbering. |
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446 * |
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447 * @param receiver the object that is written to |
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448 * @param offset the offset at which to write to the object in bytes |
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449 * @param value the value to be written |
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450 * @param locationIdentity the location identity token that can be used for improved global |
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451 * value numbering or null |
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452 */ |
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453 public static void unsafePutDouble(Object receiver, long offset, double value, Object locationIdentity) { |
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454 UNSAFE.putDouble(receiver, offset, value); |
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455 } |
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456 |
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457 /** |
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458 * Write an Object value within an object. The location identity gives a hint to the compiler |
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459 * for improved global value numbering. |
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460 * |
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461 * @param receiver the object that is written to |
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462 * @param offset the offset at which to write to the object in bytes |
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463 * @param value the value to be written |
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464 * @param locationIdentity the location identity token that can be used for improved global |
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465 * value numbering or null |
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466 */ |
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467 public static void unsafePutObject(Object receiver, long offset, Object value, Object locationIdentity) { |
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468 UNSAFE.putObject(receiver, offset, value); |
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469 } |
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470 |
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471 /** |
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472 * Unsafe access to a final boolean value within an object. The condition parameter gives a hint |
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473 * to the compiler under which circumstances this access can be moved to an earlier location in |
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474 * the program. The location identity gives a hint to the compiler for improved global value |
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475 * numbering. |
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476 * |
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477 * @param receiver the object that is accessed |
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478 * @param offset the offset at which to access the object in bytes |
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479 * @param condition the condition that makes this access safe also at an earlier location in the |
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480 * program |
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481 * @param locationIdentity the location identity token that can be used for improved global |
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482 * value numbering or null |
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483 * @return the accessed value |
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484 */ |
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485 public static boolean unsafeGetFinalBoolean(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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486 return UNSAFE.getBoolean(receiver, offset); |
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487 } |
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488 |
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489 /** |
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490 * Unsafe access to a final byte value within an object. The condition parameter gives a hint to |
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491 * the compiler under which circumstances this access can be moved to an earlier location in the |
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492 * program. The location identity gives a hint to the compiler for improved global value |
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493 * numbering. |
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494 * |
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495 * @param receiver the object that is accessed |
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496 * @param offset the offset at which to access the object in bytes |
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497 * @param condition the condition that makes this access safe also at an earlier location in the |
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498 * program |
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499 * @param locationIdentity the location identity token that can be used for improved global |
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500 * value numbering or null |
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501 * @return the accessed value |
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502 */ |
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503 public static byte unsafeGetFinalByte(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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504 return UNSAFE.getByte(receiver, offset); |
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505 } |
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506 |
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507 /** |
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508 * Unsafe access to a final short value within an object. The condition parameter gives a hint |
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509 * to the compiler under which circumstances this access can be moved to an earlier location in |
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510 * the program. The location identity gives a hint to the compiler for improved global value |
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511 * numbering. |
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512 * |
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513 * @param receiver the object that is accessed |
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514 * @param offset the offset at which to access the object in bytes |
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515 * @param condition the condition that makes this access safe also at an earlier location in the |
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516 * program |
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517 * @param locationIdentity the location identity token that can be used for improved global |
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518 * value numbering or null |
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519 * @return the accessed value |
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520 */ |
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521 public static short unsafeGetFinalShort(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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522 return UNSAFE.getShort(receiver, offset); |
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523 } |
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524 |
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525 /** |
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526 * Unsafe access to a final int value within an object. The condition parameter gives a hint to |
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527 * the compiler under which circumstances this access can be moved to an earlier location in the |
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528 * program. The location identity gives a hint to the compiler for improved global value |
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529 * numbering. |
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530 * |
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531 * @param receiver the object that is accessed |
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532 * @param offset the offset at which to access the object in bytes |
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533 * @param condition the condition that makes this access safe also at an earlier location in the |
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534 * program |
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535 * @param locationIdentity the location identity token that can be used for improved global |
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536 * value numbering or null |
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537 * @return the accessed value |
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538 */ |
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539 public static int unsafeGetFinalInt(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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540 return UNSAFE.getInt(receiver, offset); |
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541 } |
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542 |
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543 /** |
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544 * Unsafe access to a final long value within an object. The condition parameter gives a hint to |
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545 * the compiler under which circumstances this access can be moved to an earlier location in the |
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546 * program. The location identity gives a hint to the compiler for improved global value |
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547 * numbering. |
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548 * |
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549 * @param receiver the object that is accessed |
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550 * @param offset the offset at which to access the object in bytes |
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551 * @param condition the condition that makes this access safe also at an earlier location in the |
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552 * program |
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553 * @param locationIdentity the location identity token that can be used for improved global |
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554 * value numbering or null |
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555 * @return the accessed value |
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556 */ |
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557 public static long unsafeGetFinalLong(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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558 return UNSAFE.getLong(receiver, offset); |
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559 } |
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560 |
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561 /** |
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562 * Unsafe access to a final float value within an object. The condition parameter gives a hint |
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563 * to the compiler under which circumstances this access can be moved to an earlier location in |
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564 * the program. The location identity gives a hint to the compiler for improved global value |
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565 * numbering. |
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566 * |
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567 * @param receiver the object that is accessed |
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568 * @param offset the offset at which to access the object in bytes |
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569 * @param condition the condition that makes this access safe also at an earlier location in the |
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570 * program |
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571 * @param locationIdentity the location identity token that can be used for improved global |
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572 * value numbering or null |
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573 * @return the accessed value |
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574 */ |
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575 public static float unsafeGetFinalFloat(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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576 return UNSAFE.getFloat(receiver, offset); |
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577 } |
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578 |
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579 /** |
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580 * Unsafe access to a final double value within an object. The condition parameter gives a hint |
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581 * to the compiler under which circumstances this access can be moved to an earlier location in |
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582 * the program. The location identity gives a hint to the compiler for improved global value |
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583 * numbering. |
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584 * |
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585 * @param receiver the object that is accessed |
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586 * @param offset the offset at which to access the object in bytes |
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587 * @param condition the condition that makes this access safe also at an earlier location in the |
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588 * program |
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589 * @param locationIdentity the location identity token that can be used for improved global |
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590 * value numbering or null |
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591 * @return the accessed value |
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592 */ |
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593 public static double unsafeGetFinalDouble(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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594 return UNSAFE.getDouble(receiver, offset); |
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595 } |
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596 |
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597 /** |
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598 * Unsafe access to a final Object value within an object. The condition parameter gives a hint |
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599 * to the compiler under which circumstances this access can be moved to an earlier location in |
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600 * the program. The location identity gives a hint to the compiler for improved global value |
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601 * numbering. |
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602 * |
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603 * @param receiver the object that is accessed |
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604 * @param offset the offset at which to access the object in bytes |
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605 * @param condition the condition that makes this access safe also at an earlier location in the |
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606 * program |
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607 * @param locationIdentity the location identity token that can be used for improved global |
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608 * value numbering or null |
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609 * @return the accessed value |
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610 */ |
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611 public static Object unsafeGetFinalObject(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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612 return UNSAFE.getObject(receiver, offset); |
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613 } |
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614 |
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615 /** |
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616 * Marks methods that are considered slowpath and should therefore not be inlined by default. |
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617 */ |
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618 @Retention(RetentionPolicy.RUNTIME) |
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619 @Target({ElementType.METHOD}) |
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620 public @interface SlowPath { |
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621 } |
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622 |
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623 /** |
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624 * Marks classes as value types. Reference comparisons (==) between instances of those classes |
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625 * have undefined semantics and can either return true or false. |
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626 */ |
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627 @Retention(RetentionPolicy.RUNTIME) |
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628 @Target({ElementType.TYPE}) |
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629 public @interface ValueType { |
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630 } |
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631 |
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632 /** |
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633 * Ensures that the given object is not virtual, i.e., not removed by Escape Analysis at the |
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634 * point of this call. |
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635 * |
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636 * @param obj the object to exclude from Escape Analysis |
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637 */ |
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638 public static void materialize(Object obj) { |
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639 } |
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640 } |