Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/CompilerDirectives.java @ 12405:139b84d713bc
Truffle API adjustments: Simplify frame handling. Introduce cast for MaterializedFrame objects.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 14 Oct 2013 23:28:10 +0200 |
parents | f753092f608d |
children | a9837a03127e |
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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 com.oracle.truffle.api.frame.*; |
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32 |
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33 import sun.misc.*; |
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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 * Returns a boolean value indicating whether the method is executed in the interpreter. |
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72 * |
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73 * @return {@code true} when executed in the interpreter, {@code false} in compiled code. |
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74 */ |
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75 public static boolean inInterpreter() { |
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76 return true; |
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77 } |
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78 |
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79 /** |
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80 * Directive for the compiler that the given runnable should only be executed in the interpreter |
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81 * and ignored in the compiled code. |
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82 * |
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83 * @param runnable the closure that should only be executed in the interpreter |
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84 */ |
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85 public static void interpreterOnly(Runnable runnable) { |
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86 runnable.run(); |
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87 } |
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88 |
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89 /** |
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90 * Directive for the compiler that the given callable should only be executed in the |
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91 * interpreter. |
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92 * |
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93 * @param callable the closure that should only be executed in the interpreter |
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94 * @return the result of executing the closure in the interpreter and null in the compiled code |
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95 * @throws Exception If the closure throws an exception when executed in the interpreter. |
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96 */ |
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97 public static <T> T interpreterOnly(Callable<T> callable) throws Exception { |
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98 return callable.call(); |
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99 } |
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100 |
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101 /** |
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102 * Injects a probability for the given condition into the probability information of the |
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103 * immediately succeeding branch instruction for the condition. The probability must be a value |
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104 * between 0.0 and 1.0 (inclusive). The condition should not be a combined condition. |
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105 * |
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106 * Example usage immediately before an if statement (it specifies that the likelihood for a to |
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107 * be greater than b is 90%): |
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108 * |
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109 * <code> |
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110 * if (injectBranchProbability(0.9, a > b)) { |
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111 * // ... |
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112 * } |
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113 * </code> |
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114 * |
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115 * Example usage for a combined condition (it specifies that the likelihood for a to be greater |
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116 * than b is 90% and under the assumption that this is true, the likelihood for a being 0 is |
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117 * 10%): |
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118 * |
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119 * <code> |
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120 * if (injectBranchProbability(0.9, a > b) && injectBranchProbability(0.1, a == 0)) { |
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121 * // ... |
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122 * } |
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123 * </code> |
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124 * |
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125 * There are predefined constants for commonly used probabilities (see |
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126 * {@link #LIKELY_PROBABILITY} , {@link #UNLIKELY_PROBABILITY}, {@link #SLOWPATH_PROBABILITY}, |
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127 * {@link #FASTPATH_PROBABILITY} ). |
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128 * |
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129 * @param probability the probability value between 0.0 and 1.0 that should be injected |
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130 */ |
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131 public static boolean injectBranchProbability(double probability, boolean condition) { |
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132 assert probability >= 0.0 && probability <= 1.0; |
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133 return condition; |
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134 } |
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135 |
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136 /** |
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137 * Bails out of a compilation (e.g., for guest language features that should never be compiled). |
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138 * |
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139 * @param reason the reason for the bailout |
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140 */ |
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141 public static void bailout(String reason) { |
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142 } |
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143 |
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144 /** |
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145 * Marks fields that should be considered final for a Truffle compilation although they are not |
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146 * final while executing in the interpreter. |
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147 */ |
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148 @Retention(RetentionPolicy.RUNTIME) |
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149 @Target({ElementType.FIELD}) |
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150 public @interface CompilationFinal { |
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151 } |
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152 |
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153 /** |
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154 * Casts the given value to the value of the given type without any checks. The class must |
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155 * evaluate to a constant. The condition parameter gives a hint to the compiler under which |
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156 * circumstances this cast can be moved to an earlier location in the program. |
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157 * |
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158 * @param value the value that is known to have the specified type |
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159 * @param type the specified new type of the value |
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160 * @param condition the condition that makes this cast safe also at an earlier location of the |
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161 * program |
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162 * @return the value to be casted to the new type |
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163 */ |
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164 @SuppressWarnings("unchecked") |
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165 public static <T> T unsafeCast(Object value, Class<T> type, boolean condition) { |
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166 return (T) value; |
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167 } |
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168 |
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169 /** |
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170 * Asserts that this value is not null and retrieved from a call to Frame.materialize. |
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171 * |
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172 * @param value the value that is known to have been obtained via Frame.materialize |
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173 * @return the value to be casted to the new type |
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174 */ |
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175 public static MaterializedFrame unsafeFrameCast(MaterializedFrame value) { |
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176 return value; |
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177 } |
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178 |
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179 /** |
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180 * Unsafe access to a boolean value within an object. The condition parameter gives a hint to |
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181 * the compiler under which circumstances this access can be moved to an earlier location in the |
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182 * program. The location identity gives a hint to the compiler for improved global value |
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183 * numbering. |
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184 * |
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185 * @param receiver the object that is accessed |
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186 * @param offset the offset at which to access the object in bytes |
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187 * @param condition the condition that makes this access safe also at an earlier location in the |
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188 * program |
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189 * @param locationIdentity the location identity token that can be used for improved global |
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190 * value numbering or null |
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191 * @return the accessed value |
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192 */ |
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193 public static boolean unsafeGetBoolean(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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194 return UNSAFE.getBoolean(receiver, offset); |
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195 } |
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196 |
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197 /** |
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198 * Unsafe access to a byte value within an object. The condition parameter gives a hint to the |
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199 * compiler under which circumstances this access can be moved to an earlier location in the |
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200 * program. The location identity gives a hint to the compiler for improved global value |
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201 * numbering. |
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202 * |
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203 * @param receiver the object that is accessed |
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204 * @param offset the offset at which to access the object in bytes |
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205 * @param condition the condition that makes this access safe also at an earlier location in the |
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206 * program |
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207 * @param locationIdentity the location identity token that can be used for improved global |
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208 * value numbering or null |
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209 * @return the accessed value |
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210 */ |
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211 public static byte unsafeGetByte(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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212 return UNSAFE.getByte(receiver, offset); |
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213 } |
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214 |
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215 /** |
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216 * Unsafe access to a short value within an object. The condition parameter gives a hint to the |
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217 * 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 short unsafeGetShort(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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230 return UNSAFE.getShort(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 int 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 int unsafeGetInt(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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248 return UNSAFE.getInt(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 long 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 long unsafeGetLong(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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266 return UNSAFE.getLong(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 a float 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 float unsafeGetFloat(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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284 return UNSAFE.getFloat(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 double 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 double unsafeGetDouble(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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302 return UNSAFE.getDouble(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 Object 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 Object unsafeGetObject(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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320 return UNSAFE.getObject(receiver, offset); |
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321 } |
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322 |
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323 /** |
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324 * Write a boolean value within an object. The location identity gives a hint to the compiler |
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325 * for improved global value numbering. |
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326 * |
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327 * @param receiver the object that is written to |
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328 * @param offset the offset at which to write to the object in bytes |
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329 * @param value the value to be written |
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330 * @param locationIdentity the location identity token that can be used for improved global |
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331 * value numbering or null |
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332 */ |
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333 public static void unsafePutBoolean(Object receiver, long offset, boolean value, Object locationIdentity) { |
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334 UNSAFE.putBoolean(receiver, offset, value); |
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335 } |
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336 |
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337 /** |
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338 * Write a byte value within an object. The location identity gives a hint to the compiler for |
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339 * improved global value numbering. |
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340 * |
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341 * @param receiver the object that is written to |
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342 * @param offset the offset at which to write to the object in bytes |
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343 * @param value the value to be written |
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344 * @param locationIdentity the location identity token that can be used for improved global |
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345 * value numbering or null |
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346 */ |
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347 public static void unsafePutByte(Object receiver, long offset, byte value, Object locationIdentity) { |
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348 UNSAFE.putByte(receiver, offset, value); |
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349 } |
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350 |
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351 /** |
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352 * Write a short value within an object. The location identity gives a hint to the compiler for |
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353 * improved global value numbering. |
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354 * |
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355 * @param receiver the object that is written to |
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356 * @param offset the offset at which to write to the object in bytes |
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357 * @param value the value to be written |
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358 * @param locationIdentity the location identity token that can be used for improved global |
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359 * value numbering or null |
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360 */ |
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361 public static void unsafePutShort(Object receiver, long offset, short value, Object locationIdentity) { |
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362 UNSAFE.putShort(receiver, offset, value); |
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363 } |
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364 |
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365 /** |
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366 * Write a int value within an object. The location identity gives a hint to the compiler for |
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367 * improved global value numbering. |
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368 * |
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369 * @param receiver the object that is written to |
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370 * @param offset the offset at which to write to the object in bytes |
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371 * @param value the value to be written |
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372 * @param locationIdentity the location identity token that can be used for improved global |
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373 * value numbering or null |
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374 */ |
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375 public static void unsafePutInt(Object receiver, long offset, int value, Object locationIdentity) { |
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376 UNSAFE.putInt(receiver, offset, value); |
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377 } |
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378 |
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379 /** |
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380 * Write a long value within an object. The location identity gives a hint to the compiler for |
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381 * improved global value numbering. |
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382 * |
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383 * @param receiver the object that is written to |
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384 * @param offset the offset at which to write to the object in bytes |
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385 * @param value the value to be written |
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386 * @param locationIdentity the location identity token that can be used for improved global |
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387 * value numbering or null |
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388 */ |
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389 public static void unsafePutLong(Object receiver, long offset, long value, Object locationIdentity) { |
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390 UNSAFE.putLong(receiver, offset, value); |
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391 } |
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392 |
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393 /** |
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394 * Write a float value within an object. The location identity gives a hint to the compiler for |
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395 * improved global value numbering. |
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396 * |
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397 * @param receiver the object that is written to |
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398 * @param offset the offset at which to write to the object in bytes |
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399 * @param value the value to be written |
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400 * @param locationIdentity the location identity token that can be used for improved global |
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401 * value numbering or null |
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402 */ |
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403 public static void unsafePutFloat(Object receiver, long offset, float value, Object locationIdentity) { |
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404 UNSAFE.putFloat(receiver, offset, value); |
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405 } |
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406 |
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407 /** |
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408 * Write a double value within an object. The location identity gives a hint to the compiler for |
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409 * improved global value numbering. |
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410 * |
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411 * @param receiver the object that is written to |
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412 * @param offset the offset at which to write to the object in bytes |
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413 * @param value the value to be written |
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414 * @param locationIdentity the location identity token that can be used for improved global |
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415 * value numbering or null |
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416 */ |
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417 public static void unsafePutDouble(Object receiver, long offset, double value, Object locationIdentity) { |
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418 UNSAFE.putDouble(receiver, offset, value); |
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419 } |
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420 |
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421 /** |
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422 * Write a Object value within an object. The location identity gives a hint to the compiler for |
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423 * improved global value numbering. |
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424 * |
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425 * @param receiver the object that is written to |
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426 * @param offset the offset at which to write to the object in bytes |
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427 * @param value the value to be written |
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428 * @param locationIdentity the location identity token that can be used for improved global |
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429 * value numbering or null |
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430 */ |
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431 public static void unsafePutObject(Object receiver, long offset, Object value, Object locationIdentity) { |
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432 UNSAFE.putObject(receiver, offset, value); |
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433 } |
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434 |
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435 /** |
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436 * Marks methods that are considered slowpath and should therefore not be inlined by default. |
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437 */ |
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438 @Retention(RetentionPolicy.RUNTIME) |
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439 @Target({ElementType.METHOD}) |
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440 public @interface SlowPath { |
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441 } |
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442 |
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443 /** |
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444 * Marks classes as value types. Reference comparisons (==) between instances of those classes |
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445 * have undefined semantics and can either return true or false. |
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446 */ |
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447 @Retention(RetentionPolicy.RUNTIME) |
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448 @Target({ElementType.TYPE}) |
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449 public @interface ValueType { |
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450 } |
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451 } |