Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/CompilerDirectives.java @ 14628:a08b8694f556
Truffle: Node API changes
deprecate adoptChild, no longer needed in constructor
add Node#insert for inserting new nodes into the tree (previously adoptChild)
add Node#adoptChildren() helper method that adopts all (direct and indirect) children of a node, automatically called in TruffleRuntime#createCallTarget
author | Andreas Woess <andreas.woess@jku.at> |
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date | Wed, 19 Mar 2014 23:11:46 +0100 |
parents | fca29edf5667 |
children | 73546bd550f0 |
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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 * 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 * Directive for the compiler that the given runnable should only be executed in the interpreter |
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88 * and ignored in the compiled code. |
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89 * |
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90 * @param runnable the closure that should only be executed in the interpreter |
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91 */ |
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92 public static void interpreterOnly(Runnable runnable) { |
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93 runnable.run(); |
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94 } |
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95 |
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96 /** |
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97 * Directive for the compiler that the given callable should only be executed in the |
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98 * interpreter. |
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99 * |
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100 * @param callable the closure that should only be executed in the interpreter |
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101 * @return the result of executing the closure in the interpreter and null in the compiled code |
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102 * @throws Exception If the closure throws an exception when executed in the interpreter. |
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103 */ |
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104 public static <T> T interpreterOnly(Callable<T> callable) throws Exception { |
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105 return callable.call(); |
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106 } |
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107 |
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108 /** |
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109 * Injects a probability for the given condition into the probability information of the |
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110 * immediately succeeding branch instruction for the condition. The probability must be a value |
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111 * between 0.0 and 1.0 (inclusive). The condition should not be a combined condition. |
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112 * |
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113 * Example usage immediately before an if statement (it specifies that the likelihood for a to |
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114 * be greater than b is 90%): |
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115 * |
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116 * <code> |
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117 * if (injectBranchProbability(0.9, a > b)) { |
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118 * // ... |
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119 * } |
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120 * </code> |
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121 * |
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122 * Example usage for a combined condition (it specifies that the likelihood for a to be greater |
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123 * than b is 90% and under the assumption that this is true, the likelihood for a being 0 is |
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124 * 10%): |
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125 * |
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126 * <code> |
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127 * if (injectBranchProbability(0.9, a > b) && injectBranchProbability(0.1, a == 0)) { |
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128 * // ... |
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129 * } |
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130 * </code> |
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131 * |
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132 * There are predefined constants for commonly used probabilities (see |
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133 * {@link #LIKELY_PROBABILITY} , {@link #UNLIKELY_PROBABILITY}, {@link #SLOWPATH_PROBABILITY}, |
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134 * {@link #FASTPATH_PROBABILITY} ). |
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135 * |
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136 * @param probability the probability value between 0.0 and 1.0 that should be injected |
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137 */ |
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138 public static boolean injectBranchProbability(double probability, boolean condition) { |
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139 assert probability >= 0.0 && probability <= 1.0; |
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140 return condition; |
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141 } |
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142 |
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143 /** |
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144 * Bails out of a compilation (e.g., for guest language features that should never be compiled). |
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145 * |
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146 * @param reason the reason for the bailout |
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147 */ |
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148 public static void bailout(String reason) { |
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149 } |
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150 |
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151 /** |
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152 * Marks fields that should be considered final for a Truffle compilation although they are not |
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153 * final while executing in the interpreter. |
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154 */ |
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155 @Retention(RetentionPolicy.RUNTIME) |
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156 @Target({ElementType.FIELD}) |
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157 public @interface CompilationFinal { |
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158 } |
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159 |
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160 /** |
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161 * Casts the given value to the value of the given type without any checks. The class must |
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162 * evaluate to a constant. The condition parameter gives a hint to the compiler under which |
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163 * circumstances this cast can be moved to an earlier location in the program. |
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164 * |
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165 * @param value the value that is known to have the specified type |
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166 * @param type the specified new type of the value |
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167 * @param condition the condition that makes this cast safe also at an earlier location of the |
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168 * program |
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169 * @return the value to be casted to the new type |
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170 */ |
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171 @SuppressWarnings("unchecked") |
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172 public static <T> T unsafeCast(Object value, Class<T> type, boolean condition) { |
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173 return (T) value; |
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174 } |
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175 |
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176 /** |
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177 * Asserts that this value is not null and retrieved from a call to Frame.materialize. |
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178 * |
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179 * @param value the value that is known to have been obtained via Frame.materialize |
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180 * @return the value to be casted to the new type |
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181 */ |
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182 public static MaterializedFrame unsafeFrameCast(MaterializedFrame value) { |
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183 return unsafeCast(value, getUnsafeFrameType(), true); |
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184 } |
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185 |
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186 private static Class<? extends MaterializedFrame> getUnsafeFrameType() { |
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187 return MaterializedFrame.class; |
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188 } |
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189 |
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190 /** |
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191 * Unsafe access to a boolean value within an object. The condition parameter gives a hint to |
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192 * the compiler under which circumstances this access can be moved to an earlier location in the |
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193 * program. The location identity gives a hint to the compiler for improved global value |
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194 * numbering. |
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195 * |
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196 * @param receiver the object that is accessed |
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197 * @param offset the offset at which to access the object in bytes |
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198 * @param condition the condition that makes this access safe also at an earlier location in the |
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199 * program |
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200 * @param locationIdentity the location identity token that can be used for improved global |
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201 * value numbering or null |
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202 * @return the accessed value |
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203 */ |
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204 public static boolean unsafeGetBoolean(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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205 return UNSAFE.getBoolean(receiver, offset); |
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206 } |
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207 |
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208 /** |
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209 * Unsafe access to a byte value within an object. The condition parameter gives a hint to the |
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210 * compiler under which circumstances this access can be moved to an earlier location in the |
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211 * program. The location identity gives a hint to the compiler for improved global value |
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212 * numbering. |
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213 * |
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214 * @param receiver the object that is accessed |
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215 * @param offset the offset at which to access the object in bytes |
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216 * @param condition the condition that makes this access safe also at an earlier location in the |
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217 * program |
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218 * @param locationIdentity the location identity token that can be used for improved global |
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219 * value numbering or null |
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220 * @return the accessed value |
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221 */ |
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222 public static byte unsafeGetByte(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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223 return UNSAFE.getByte(receiver, offset); |
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224 } |
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225 |
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226 /** |
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227 * Unsafe access to a short value within an object. The condition parameter gives a hint to the |
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228 * compiler under which circumstances this access can be moved to an earlier location in the |
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229 * program. The location identity gives a hint to the compiler for improved global value |
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230 * numbering. |
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231 * |
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232 * @param receiver the object that is accessed |
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233 * @param offset the offset at which to access the object in bytes |
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234 * @param condition the condition that makes this access safe also at an earlier location in the |
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235 * program |
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236 * @param locationIdentity the location identity token that can be used for improved global |
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237 * value numbering or null |
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238 * @return the accessed value |
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239 */ |
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240 public static short unsafeGetShort(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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241 return UNSAFE.getShort(receiver, offset); |
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242 } |
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243 |
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244 /** |
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245 * Unsafe access to an int value within an object. The condition parameter gives a hint to the |
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246 * compiler under which circumstances this access can be moved to an earlier location in the |
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247 * program. The location identity gives a hint to the compiler for improved global value |
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248 * numbering. |
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249 * |
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250 * @param receiver the object that is accessed |
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251 * @param offset the offset at which to access the object in bytes |
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252 * @param condition the condition that makes this access safe also at an earlier location in the |
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253 * program |
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254 * @param locationIdentity the location identity token that can be used for improved global |
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255 * value numbering or null |
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256 * @return the accessed value |
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257 */ |
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258 public static int unsafeGetInt(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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259 return UNSAFE.getInt(receiver, offset); |
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260 } |
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261 |
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262 /** |
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263 * Unsafe access to a long value within an object. The condition parameter gives a hint to the |
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264 * compiler under which circumstances this access can be moved to an earlier location in the |
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265 * program. The location identity gives a hint to the compiler for improved global value |
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266 * numbering. |
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267 * |
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268 * @param receiver the object that is accessed |
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269 * @param offset the offset at which to access the object in bytes |
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270 * @param condition the condition that makes this access safe also at an earlier location in the |
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271 * program |
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272 * @param locationIdentity the location identity token that can be used for improved global |
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273 * value numbering or null |
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274 * @return the accessed value |
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275 */ |
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276 public static long unsafeGetLong(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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277 return UNSAFE.getLong(receiver, offset); |
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278 } |
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279 |
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280 /** |
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281 * Unsafe access to a float value within an object. The condition parameter gives a hint to the |
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282 * compiler under which circumstances this access can be moved to an earlier location in the |
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283 * program. The location identity gives a hint to the compiler for improved global value |
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284 * numbering. |
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285 * |
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286 * @param receiver the object that is accessed |
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287 * @param offset the offset at which to access the object in bytes |
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288 * @param condition the condition that makes this access safe also at an earlier location in the |
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289 * program |
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290 * @param locationIdentity the location identity token that can be used for improved global |
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291 * value numbering or null |
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292 * @return the accessed value |
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293 */ |
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294 public static float unsafeGetFloat(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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295 return UNSAFE.getFloat(receiver, offset); |
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296 } |
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297 |
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298 /** |
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299 * Unsafe access to a double value within an object. The condition parameter gives a hint to the |
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300 * compiler under which circumstances this access can be moved to an earlier location in the |
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301 * program. The location identity gives a hint to the compiler for improved global value |
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302 * numbering. |
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303 * |
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304 * @param receiver the object that is accessed |
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305 * @param offset the offset at which to access the object in bytes |
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306 * @param condition the condition that makes this access safe also at an earlier location in the |
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307 * program |
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308 * @param locationIdentity the location identity token that can be used for improved global |
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309 * value numbering or null |
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310 * @return the accessed value |
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311 */ |
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312 public static double unsafeGetDouble(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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313 return UNSAFE.getDouble(receiver, offset); |
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314 } |
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315 |
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316 /** |
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317 * Unsafe access to an Object value within an object. The condition parameter gives a hint to |
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318 * the compiler under which circumstances this access can be moved to an earlier location in the |
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319 * program. The location identity gives a hint to the compiler for improved global value |
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320 * numbering. |
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321 * |
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322 * @param receiver the object that is accessed |
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323 * @param offset the offset at which to access the object in bytes |
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324 * @param condition the condition that makes this access safe also at an earlier location in the |
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325 * program |
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326 * @param locationIdentity the location identity token that can be used for improved global |
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327 * value numbering or null |
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328 * @return the accessed value |
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329 */ |
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330 public static Object unsafeGetObject(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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331 return UNSAFE.getObject(receiver, offset); |
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332 } |
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333 |
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334 /** |
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335 * Write a boolean value within an object. The location identity gives a hint to the compiler |
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336 * for improved global value numbering. |
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337 * |
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338 * @param receiver the object that is written to |
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339 * @param offset the offset at which to write to the object in bytes |
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340 * @param value the value to be written |
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341 * @param locationIdentity the location identity token that can be used for improved global |
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342 * value numbering or null |
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343 */ |
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344 public static void unsafePutBoolean(Object receiver, long offset, boolean value, Object locationIdentity) { |
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345 UNSAFE.putBoolean(receiver, offset, value); |
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346 } |
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347 |
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348 /** |
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349 * Write a byte value within an object. The location identity gives a hint to the compiler for |
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350 * improved global value numbering. |
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351 * |
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352 * @param receiver the object that is written to |
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353 * @param offset the offset at which to write to the object in bytes |
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354 * @param value the value to be written |
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355 * @param locationIdentity the location identity token that can be used for improved global |
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356 * value numbering or null |
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357 */ |
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358 public static void unsafePutByte(Object receiver, long offset, byte value, Object locationIdentity) { |
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359 UNSAFE.putByte(receiver, offset, value); |
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360 } |
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361 |
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362 /** |
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363 * Write a short value within an object. The location identity gives a hint to the compiler for |
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364 * improved global value numbering. |
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365 * |
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366 * @param receiver the object that is written to |
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367 * @param offset the offset at which to write to the object in bytes |
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368 * @param value the value to be written |
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369 * @param locationIdentity the location identity token that can be used for improved global |
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370 * value numbering or null |
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371 */ |
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372 public static void unsafePutShort(Object receiver, long offset, short value, Object locationIdentity) { |
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373 UNSAFE.putShort(receiver, offset, value); |
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374 } |
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375 |
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376 /** |
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377 * Write an int value within an object. The location identity gives a hint to the compiler for |
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378 * improved global value numbering. |
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379 * |
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380 * @param receiver the object that is written to |
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381 * @param offset the offset at which to write to the object in bytes |
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382 * @param value the value to be written |
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383 * @param locationIdentity the location identity token that can be used for improved global |
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384 * value numbering or null |
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385 */ |
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386 public static void unsafePutInt(Object receiver, long offset, int value, Object locationIdentity) { |
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387 UNSAFE.putInt(receiver, offset, value); |
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388 } |
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389 |
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390 /** |
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391 * Write a long value within an object. The location identity gives a hint to the compiler for |
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392 * improved global value numbering. |
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393 * |
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394 * @param receiver the object that is written to |
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395 * @param offset the offset at which to write to the object in bytes |
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396 * @param value the value to be written |
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397 * @param locationIdentity the location identity token that can be used for improved global |
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398 * value numbering or null |
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399 */ |
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400 public static void unsafePutLong(Object receiver, long offset, long value, Object locationIdentity) { |
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401 UNSAFE.putLong(receiver, offset, value); |
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402 } |
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403 |
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404 /** |
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405 * Write a float value within an object. The location identity gives a hint to the compiler for |
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406 * improved global value numbering. |
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407 * |
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408 * @param receiver the object that is written to |
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409 * @param offset the offset at which to write to the object in bytes |
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410 * @param value the value to be written |
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411 * @param locationIdentity the location identity token that can be used for improved global |
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412 * value numbering or null |
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413 */ |
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414 public static void unsafePutFloat(Object receiver, long offset, float value, Object locationIdentity) { |
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415 UNSAFE.putFloat(receiver, offset, value); |
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416 } |
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417 |
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418 /** |
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419 * Write a double value within an object. The location identity gives a hint to the compiler for |
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420 * improved global value numbering. |
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421 * |
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422 * @param receiver the object that is written to |
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423 * @param offset the offset at which to write to the object in bytes |
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424 * @param value the value to be written |
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425 * @param locationIdentity the location identity token that can be used for improved global |
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426 * value numbering or null |
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427 */ |
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428 public static void unsafePutDouble(Object receiver, long offset, double value, Object locationIdentity) { |
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429 UNSAFE.putDouble(receiver, offset, value); |
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430 } |
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431 |
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432 /** |
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433 * Write an Object value within an object. The location identity gives a hint to the compiler |
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434 * for improved global value numbering. |
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435 * |
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436 * @param receiver the object that is written to |
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437 * @param offset the offset at which to write to the object in bytes |
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438 * @param value the value to be written |
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439 * @param locationIdentity the location identity token that can be used for improved global |
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440 * value numbering or null |
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441 */ |
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442 public static void unsafePutObject(Object receiver, long offset, Object value, Object locationIdentity) { |
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443 UNSAFE.putObject(receiver, offset, value); |
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444 } |
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445 |
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446 /** |
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447 * Unsafe access to a final boolean value within an object. The condition parameter gives a hint |
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448 * to the compiler under which circumstances this access can be moved to an earlier location in |
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449 * the program. The location identity gives a hint to the compiler for improved global value |
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450 * numbering. |
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451 * |
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452 * @param receiver the object that is accessed |
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453 * @param offset the offset at which to access the object in bytes |
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454 * @param condition the condition that makes this access safe also at an earlier location in the |
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455 * program |
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456 * @param locationIdentity the location identity token that can be used for improved global |
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457 * value numbering or null |
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458 * @return the accessed value |
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459 */ |
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460 public static boolean unsafeGetFinalBoolean(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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461 return UNSAFE.getBoolean(receiver, offset); |
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462 } |
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463 |
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464 /** |
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465 * Unsafe access to a final byte value within an object. The condition parameter gives a hint to |
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466 * the compiler under which circumstances this access can be moved to an earlier location in the |
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467 * program. The location identity gives a hint to the compiler for improved global value |
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468 * numbering. |
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469 * |
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470 * @param receiver the object that is accessed |
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471 * @param offset the offset at which to access the object in bytes |
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472 * @param condition the condition that makes this access safe also at an earlier location in the |
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473 * program |
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474 * @param locationIdentity the location identity token that can be used for improved global |
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475 * value numbering or null |
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476 * @return the accessed value |
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477 */ |
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478 public static byte unsafeGetFinalByte(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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479 return UNSAFE.getByte(receiver, offset); |
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480 } |
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481 |
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482 /** |
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483 * Unsafe access to a final short value within an object. The condition parameter gives a hint |
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484 * to the compiler under which circumstances this access can be moved to an earlier location in |
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485 * the program. The location identity gives a hint to the compiler for improved global value |
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486 * numbering. |
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487 * |
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488 * @param receiver the object that is accessed |
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489 * @param offset the offset at which to access the object in bytes |
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490 * @param condition the condition that makes this access safe also at an earlier location in the |
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491 * program |
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492 * @param locationIdentity the location identity token that can be used for improved global |
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493 * value numbering or null |
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494 * @return the accessed value |
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495 */ |
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496 public static short unsafeGetFinalShort(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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497 return UNSAFE.getShort(receiver, offset); |
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498 } |
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499 |
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500 /** |
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501 * Unsafe access to a final int value within an object. The condition parameter gives a hint to |
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502 * the compiler under which circumstances this access can be moved to an earlier location in the |
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503 * program. The location identity gives a hint to the compiler for improved global value |
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504 * numbering. |
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505 * |
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506 * @param receiver the object that is accessed |
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507 * @param offset the offset at which to access the object in bytes |
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508 * @param condition the condition that makes this access safe also at an earlier location in the |
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509 * program |
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510 * @param locationIdentity the location identity token that can be used for improved global |
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511 * value numbering or null |
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512 * @return the accessed value |
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513 */ |
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514 public static int unsafeGetFinalInt(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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515 return UNSAFE.getInt(receiver, offset); |
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516 } |
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517 |
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518 /** |
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519 * Unsafe access to a final long value within an object. The condition parameter gives a hint to |
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520 * the compiler under which circumstances this access can be moved to an earlier location in the |
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521 * program. The location identity gives a hint to the compiler for improved global value |
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522 * numbering. |
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523 * |
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524 * @param receiver the object that is accessed |
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525 * @param offset the offset at which to access the object in bytes |
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526 * @param condition the condition that makes this access safe also at an earlier location in the |
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527 * program |
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528 * @param locationIdentity the location identity token that can be used for improved global |
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529 * value numbering or null |
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530 * @return the accessed value |
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531 */ |
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532 public static long unsafeGetFinalLong(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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533 return UNSAFE.getLong(receiver, offset); |
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534 } |
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535 |
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536 /** |
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537 * Unsafe access to a final float value within an object. The condition parameter gives a hint |
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538 * to the compiler under which circumstances this access can be moved to an earlier location in |
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539 * the program. The location identity gives a hint to the compiler for improved global value |
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540 * numbering. |
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541 * |
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542 * @param receiver the object that is accessed |
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543 * @param offset the offset at which to access the object in bytes |
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544 * @param condition the condition that makes this access safe also at an earlier location in the |
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545 * program |
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546 * @param locationIdentity the location identity token that can be used for improved global |
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547 * value numbering or null |
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548 * @return the accessed value |
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549 */ |
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550 public static float unsafeGetFinalFloat(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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551 return UNSAFE.getFloat(receiver, offset); |
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552 } |
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553 |
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554 /** |
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555 * Unsafe access to a final double value within an object. The condition parameter gives a hint |
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556 * to the compiler under which circumstances this access can be moved to an earlier location in |
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557 * the program. The location identity gives a hint to the compiler for improved global value |
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558 * numbering. |
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559 * |
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560 * @param receiver the object that is accessed |
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561 * @param offset the offset at which to access the object in bytes |
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562 * @param condition the condition that makes this access safe also at an earlier location in the |
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563 * program |
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564 * @param locationIdentity the location identity token that can be used for improved global |
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565 * value numbering or null |
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566 * @return the accessed value |
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567 */ |
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568 public static double unsafeGetFinalDouble(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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569 return UNSAFE.getDouble(receiver, offset); |
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570 } |
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571 |
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572 /** |
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573 * Unsafe access to a final Object value within an object. The condition parameter gives a hint |
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574 * to the compiler under which circumstances this access can be moved to an earlier location in |
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575 * the program. The location identity gives a hint to the compiler for improved global value |
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576 * numbering. |
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577 * |
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578 * @param receiver the object that is accessed |
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579 * @param offset the offset at which to access the object in bytes |
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580 * @param condition the condition that makes this access safe also at an earlier location in the |
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581 * program |
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582 * @param locationIdentity the location identity token that can be used for improved global |
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583 * value numbering or null |
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584 * @return the accessed value |
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585 */ |
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586 public static Object unsafeGetFinalObject(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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587 return UNSAFE.getObject(receiver, offset); |
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588 } |
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589 |
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590 /** |
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591 * Marks methods that are considered slowpath and should therefore not be inlined by default. |
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592 */ |
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593 @Retention(RetentionPolicy.RUNTIME) |
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594 @Target({ElementType.METHOD}) |
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595 public @interface SlowPath { |
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596 } |
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597 |
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598 /** |
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599 * Marks classes as value types. Reference comparisons (==) between instances of those classes |
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600 * have undefined semantics and can either return true or false. |
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601 */ |
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602 @Retention(RetentionPolicy.RUNTIME) |
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603 @Target({ElementType.TYPE}) |
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604 public @interface ValueType { |
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605 } |
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606 } |