Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/CompilerDirectives.java @ 18219:4a8dd0fdcc38
Truffle: remove CompilerDirectives.unsafeFrameCast
author | Andreas Woess <andreas.woess@jku.at> |
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date | Thu, 30 Oct 2014 16:32:31 +0100 |
parents | b4e38f4ca414 |
children | d079b2af3a15 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package com.oracle.truffle.api; |
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26 |
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27 import java.lang.annotation.*; |
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28 import java.lang.reflect.*; |
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29 import java.util.concurrent.*; |
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30 |
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31 import sun.misc.*; |
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32 |
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33 /** |
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34 * Directives that influence the optimizations of the Truffle compiler. All of the operations have |
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35 * no effect when executed in the Truffle interpreter. |
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36 */ |
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37 public final class CompilerDirectives { |
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38 |
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39 public static final double LIKELY_PROBABILITY = 0.75; |
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40 public static final double UNLIKELY_PROBABILITY = 1.0 - LIKELY_PROBABILITY; |
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41 |
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42 public static final double SLOWPATH_PROBABILITY = 0.0001; |
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43 public static final double FASTPATH_PROBABILITY = 1.0 - SLOWPATH_PROBABILITY; |
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44 |
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45 private static final Unsafe UNSAFE = getUnsafe(); |
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46 |
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47 private static Unsafe getUnsafe() { |
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48 try { |
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49 return Unsafe.getUnsafe(); |
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50 } catch (SecurityException e) { |
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51 } |
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52 try { |
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53 Field theUnsafeInstance = Unsafe.class.getDeclaredField("theUnsafe"); |
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54 theUnsafeInstance.setAccessible(true); |
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55 return (Unsafe) theUnsafeInstance.get(Unsafe.class); |
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56 } catch (Exception e) { |
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57 throw new RuntimeException("exception while trying to get Unsafe.theUnsafe via reflection:", e); |
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58 } |
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59 } |
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60 |
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61 /** |
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62 * Directive for the compiler to discontinue compilation at this code position and instead |
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63 * insert a transfer to the interpreter. |
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64 */ |
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65 public static void transferToInterpreter() { |
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66 if (inInterpreter()) { |
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67 Truffle.getRuntime().notifyTransferToInterpreter(); |
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68 } |
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69 } |
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70 |
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71 /** |
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72 * Directive for the compiler to discontinue compilation at this code position and instead |
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73 * insert a transfer to the interpreter, invalidating the currently executing machine code. |
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74 */ |
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75 public static void transferToInterpreterAndInvalidate() { |
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76 if (inInterpreter()) { |
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77 Truffle.getRuntime().notifyTransferToInterpreter(); |
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78 } |
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79 } |
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80 |
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81 /** |
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82 * Returns a boolean value indicating whether the method is executed in the interpreter. |
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83 * |
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84 * @return {@code true} when executed in the interpreter, {@code false} in compiled code. |
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85 */ |
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86 public static boolean inInterpreter() { |
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87 return true; |
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88 } |
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89 |
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90 /** |
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91 * Returns a boolean value indicating whether the method is executed in the compiled code. |
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92 * |
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93 * @return {@code false} when executed in the interpreter, {@code true} in compiled code. |
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94 */ |
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95 public static boolean inCompiledCode() { |
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96 return false; |
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97 } |
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98 |
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99 /** |
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100 * Returns a boolean indicating whether or not a given value is seen as constant in optimized |
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101 * code. If this method is called in the interpreter this method will always return |
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102 * <code>false</code>. This API may be used in combination with {@link #inCompiledCode()} to |
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103 * implement compilation constant assertions in the following way: |
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104 * |
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105 * <pre> |
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106 * <code> |
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107 * void assertCompilationConstant(Object value) { |
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108 * if (inCompiledCode()) { |
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109 * if (!isCompilationConstant(value)) { |
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110 * throw new AssertionError("Given value is not constant"); |
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111 * } |
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112 * } |
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113 * } |
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114 * </code> |
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115 * </pre> |
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116 * |
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117 * @param value |
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118 * @return {@code true} when given value is seen as compilation constant, {@code false} if not |
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119 * compilation constant. |
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120 */ |
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121 public static boolean isCompilationConstant(Object value) { |
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122 return false; |
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123 } |
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124 |
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125 /** |
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126 * Directive for the compiler that the given runnable should only be executed in the interpreter |
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127 * and ignored in the compiled code. |
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128 * |
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129 * @param runnable the closure that should only be executed in the interpreter |
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130 */ |
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131 public static void interpreterOnly(Runnable runnable) { |
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132 runnable.run(); |
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133 } |
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134 |
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135 /** |
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136 * Directive for the compiler that the given callable should only be executed in the |
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137 * interpreter. |
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138 * |
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139 * @param callable the closure that should only be executed in the interpreter |
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140 * @return the result of executing the closure in the interpreter and null in the compiled code |
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141 * @throws Exception If the closure throws an exception when executed in the interpreter. |
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142 */ |
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143 public static <T> T interpreterOnly(Callable<T> callable) throws Exception { |
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144 return callable.call(); |
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145 } |
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146 |
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147 /** |
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148 * Injects a probability for the given condition into the probability information of the |
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149 * immediately succeeding branch instruction for the condition. The probability must be a value |
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150 * between 0.0 and 1.0 (inclusive). The condition should not be a combined condition. |
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151 * |
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152 * Example usage immediately before an if statement (it specifies that the likelihood for a to |
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153 * be greater than b is 90%): |
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154 * |
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155 * <code> |
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157 * // ... |
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158 * } |
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159 * </code> |
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160 * |
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161 * Example usage for a combined condition (it specifies that the likelihood for a to be greater |
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162 * than b is 90% and under the assumption that this is true, the likelihood for a being 0 is |
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163 * 10%): |
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164 * |
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165 * <code> |
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167 * // ... |
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168 * } |
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169 * </code> |
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170 * |
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171 * There are predefined constants for commonly used probabilities (see |
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172 * {@link #LIKELY_PROBABILITY} , {@link #UNLIKELY_PROBABILITY}, {@link #SLOWPATH_PROBABILITY}, |
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173 * {@link #FASTPATH_PROBABILITY} ). |
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174 * |
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175 * @param probability the probability value between 0.0 and 1.0 that should be injected |
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176 */ |
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177 public static boolean injectBranchProbability(double probability, boolean condition) { |
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178 assert probability >= 0.0 && probability <= 1.0; |
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179 return condition; |
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180 } |
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181 |
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182 /** |
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183 * Bails out of a compilation (e.g., for guest language features that should never be compiled). |
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184 * |
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185 * @param reason the reason for the bailout |
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186 */ |
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187 public static void bailout(String reason) { |
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188 } |
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189 |
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190 /** |
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191 * Marks fields that should be considered final for a Truffle compilation although they are not |
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192 * final while executing in the interpreter. |
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193 */ |
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194 @Retention(RetentionPolicy.RUNTIME) |
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195 @Target({ElementType.FIELD}) |
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196 public @interface CompilationFinal { |
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197 } |
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198 |
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199 /** |
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200 * Casts the given value to the value of the given type without any checks. The class must |
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201 * evaluate to a constant. The condition parameter gives a hint to the compiler under which |
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202 * circumstances this cast can be moved to an earlier location in the program. |
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203 * |
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204 * @param value the value that is known to have the specified type |
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205 * @param type the specified new type of the value |
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206 * @param condition the condition that makes this cast safe also at an earlier location of the |
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207 * program |
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208 * @return the value to be casted to the new type |
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209 */ |
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210 public static <T> T unsafeCast(Object value, Class<T> type, boolean condition) { |
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211 return unsafeCast(value, type, condition, false); |
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212 } |
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213 |
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214 /** |
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215 * Casts the given value to the value of the given type without any checks. The class must |
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216 * evaluate to a constant. The condition parameter gives a hint to the compiler under which |
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217 * circumstances this cast can be moved to an earlier location in the program. |
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218 * |
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219 * @param value the value that is known to have the specified type |
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220 * @param type the specified new type of the value |
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221 * @param condition the condition that makes this cast safe also at an earlier location of the |
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222 * program |
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223 * @param nonNull whether value is known to never be null |
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224 * @return the value to be casted to the new type |
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225 */ |
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226 @SuppressWarnings("unchecked") |
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227 public static <T> T unsafeCast(Object value, Class<T> type, boolean condition, boolean nonNull) { |
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228 return (T) value; |
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229 } |
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230 |
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231 /** |
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232 * Unsafe access to a boolean value within an object. The condition parameter gives a hint to |
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233 * the compiler under which circumstances this access can be moved to an earlier location in the |
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234 * program. The location identity gives a hint to the compiler for improved global value |
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235 * numbering. |
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236 * |
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237 * @param receiver the object that is accessed |
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238 * @param offset the offset at which to access the object in bytes |
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239 * @param condition the condition that makes this access safe also at an earlier location in the |
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240 * program |
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241 * @param locationIdentity the location identity token that can be used for improved global |
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242 * value numbering or null |
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243 * @return the accessed value |
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244 */ |
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245 public static boolean unsafeGetBoolean(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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246 return UNSAFE.getBoolean(receiver, offset); |
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247 } |
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248 |
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249 /** |
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250 * Unsafe access to a byte value within an object. The condition parameter gives a hint to the |
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251 * compiler under which circumstances this access can be moved to an earlier location in the |
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252 * program. The location identity gives a hint to the compiler for improved global value |
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253 * numbering. |
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254 * |
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255 * @param receiver the object that is accessed |
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256 * @param offset the offset at which to access the object in bytes |
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257 * @param condition the condition that makes this access safe also at an earlier location in the |
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258 * program |
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259 * @param locationIdentity the location identity token that can be used for improved global |
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260 * value numbering or null |
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261 * @return the accessed value |
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262 */ |
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263 public static byte unsafeGetByte(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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264 return UNSAFE.getByte(receiver, offset); |
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265 } |
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266 |
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267 /** |
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268 * Unsafe access to a short value within an object. The condition parameter gives a hint to the |
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269 * compiler under which circumstances this access can be moved to an earlier location in the |
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270 * program. The location identity gives a hint to the compiler for improved global value |
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271 * numbering. |
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272 * |
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273 * @param receiver the object that is accessed |
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274 * @param offset the offset at which to access the object in bytes |
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275 * @param condition the condition that makes this access safe also at an earlier location in the |
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276 * program |
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277 * @param locationIdentity the location identity token that can be used for improved global |
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278 * value numbering or null |
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279 * @return the accessed value |
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280 */ |
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281 public static short unsafeGetShort(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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282 return UNSAFE.getShort(receiver, offset); |
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283 } |
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284 |
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285 /** |
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286 * Unsafe access to an int value within an object. The condition parameter gives a hint to the |
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287 * compiler under which circumstances this access can be moved to an earlier location in the |
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288 * program. The location identity gives a hint to the compiler for improved global value |
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289 * numbering. |
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290 * |
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291 * @param receiver the object that is accessed |
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292 * @param offset the offset at which to access the object in bytes |
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293 * @param condition the condition that makes this access safe also at an earlier location in the |
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294 * program |
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295 * @param locationIdentity the location identity token that can be used for improved global |
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296 * value numbering or null |
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297 * @return the accessed value |
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298 */ |
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299 public static int unsafeGetInt(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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300 return UNSAFE.getInt(receiver, offset); |
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301 } |
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302 |
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303 /** |
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304 * Unsafe access to a long value within an object. The condition parameter gives a hint to the |
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305 * compiler under which circumstances this access can be moved to an earlier location in the |
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306 * program. The location identity gives a hint to the compiler for improved global value |
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307 * numbering. |
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308 * |
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309 * @param receiver the object that is accessed |
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310 * @param offset the offset at which to access the object in bytes |
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311 * @param condition the condition that makes this access safe also at an earlier location in the |
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312 * program |
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313 * @param locationIdentity the location identity token that can be used for improved global |
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314 * value numbering or null |
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315 * @return the accessed value |
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316 */ |
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317 public static long unsafeGetLong(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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318 return UNSAFE.getLong(receiver, offset); |
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319 } |
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320 |
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321 /** |
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322 * Unsafe access to a float value within an object. The condition parameter gives a hint to the |
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323 * compiler under which circumstances this access can be moved to an earlier location in the |
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324 * program. The location identity gives a hint to the compiler for improved global value |
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325 * numbering. |
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326 * |
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327 * @param receiver the object that is accessed |
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328 * @param offset the offset at which to access the object in bytes |
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329 * @param condition the condition that makes this access safe also at an earlier location in the |
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330 * program |
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331 * @param locationIdentity the location identity token that can be used for improved global |
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332 * value numbering or null |
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333 * @return the accessed value |
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334 */ |
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335 public static float unsafeGetFloat(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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336 return UNSAFE.getFloat(receiver, offset); |
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337 } |
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338 |
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339 /** |
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340 * Unsafe access to a double value within an object. The condition parameter gives a hint to the |
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341 * compiler under which circumstances this access can be moved to an earlier location in the |
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342 * program. The location identity gives a hint to the compiler for improved global value |
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343 * numbering. |
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344 * |
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345 * @param receiver the object that is accessed |
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346 * @param offset the offset at which to access the object in bytes |
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347 * @param condition the condition that makes this access safe also at an earlier location in the |
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348 * program |
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349 * @param locationIdentity the location identity token that can be used for improved global |
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350 * value numbering or null |
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351 * @return the accessed value |
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352 */ |
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353 public static double unsafeGetDouble(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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354 return UNSAFE.getDouble(receiver, offset); |
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355 } |
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356 |
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357 /** |
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358 * Unsafe access to an Object value within an object. The condition parameter gives a hint to |
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359 * the compiler under which circumstances this access can be moved to an earlier location in the |
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360 * program. The location identity gives a hint to the compiler for improved global value |
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361 * numbering. |
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362 * |
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363 * @param receiver the object that is accessed |
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364 * @param offset the offset at which to access the object in bytes |
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365 * @param condition the condition that makes this access safe also at an earlier location in the |
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366 * program |
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367 * @param locationIdentity the location identity token that can be used for improved global |
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368 * value numbering or null |
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369 * @return the accessed value |
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370 */ |
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371 public static Object unsafeGetObject(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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372 return UNSAFE.getObject(receiver, offset); |
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373 } |
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374 |
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375 /** |
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376 * Write a boolean value within an object. The location identity gives a hint to the compiler |
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377 * for improved global value numbering. |
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378 * |
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379 * @param receiver the object that is written to |
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380 * @param offset the offset at which to write to the object in bytes |
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381 * @param value the value to be written |
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382 * @param locationIdentity the location identity token that can be used for improved global |
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383 * value numbering or null |
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384 */ |
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385 public static void unsafePutBoolean(Object receiver, long offset, boolean value, Object locationIdentity) { |
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386 UNSAFE.putBoolean(receiver, offset, value); |
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387 } |
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388 |
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389 /** |
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390 * Write a byte value within an object. The location identity gives a hint to the compiler for |
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391 * improved global value numbering. |
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392 * |
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393 * @param receiver the object that is written to |
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394 * @param offset the offset at which to write to the object in bytes |
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395 * @param value the value to be written |
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396 * @param locationIdentity the location identity token that can be used for improved global |
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397 * value numbering or null |
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398 */ |
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399 public static void unsafePutByte(Object receiver, long offset, byte value, Object locationIdentity) { |
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400 UNSAFE.putByte(receiver, offset, value); |
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401 } |
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402 |
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403 /** |
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404 * Write a short value within an object. The location identity gives a hint to the compiler for |
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405 * improved global value numbering. |
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406 * |
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407 * @param receiver the object that is written to |
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408 * @param offset the offset at which to write to the object in bytes |
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409 * @param value the value to be written |
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410 * @param locationIdentity the location identity token that can be used for improved global |
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411 * value numbering or null |
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412 */ |
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413 public static void unsafePutShort(Object receiver, long offset, short value, Object locationIdentity) { |
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414 UNSAFE.putShort(receiver, offset, value); |
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415 } |
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416 |
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417 /** |
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418 * Write an int value within an object. The location identity gives a hint to the compiler for |
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419 * improved global value numbering. |
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420 * |
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421 * @param receiver the object that is written to |
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422 * @param offset the offset at which to write to the object in bytes |
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423 * @param value the value to be written |
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424 * @param locationIdentity the location identity token that can be used for improved global |
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425 * value numbering or null |
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426 */ |
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427 public static void unsafePutInt(Object receiver, long offset, int value, Object locationIdentity) { |
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428 UNSAFE.putInt(receiver, offset, value); |
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429 } |
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430 |
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431 /** |
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432 * Write a long value within an object. The location identity gives a hint to the compiler for |
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433 * improved global value numbering. |
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434 * |
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435 * @param receiver the object that is written to |
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436 * @param offset the offset at which to write to the object in bytes |
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437 * @param value the value to be written |
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438 * @param locationIdentity the location identity token that can be used for improved global |
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439 * value numbering or null |
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440 */ |
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441 public static void unsafePutLong(Object receiver, long offset, long value, Object locationIdentity) { |
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442 UNSAFE.putLong(receiver, offset, value); |
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443 } |
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444 |
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445 /** |
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446 * Write a float value within an object. The location identity gives a hint to the compiler for |
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447 * improved global value numbering. |
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448 * |
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449 * @param receiver the object that is written to |
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450 * @param offset the offset at which to write to the object in bytes |
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451 * @param value the value to be written |
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452 * @param locationIdentity the location identity token that can be used for improved global |
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453 * value numbering or null |
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454 */ |
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455 public static void unsafePutFloat(Object receiver, long offset, float value, Object locationIdentity) { |
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456 UNSAFE.putFloat(receiver, offset, value); |
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457 } |
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458 |
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459 /** |
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460 * Write a double value within an object. The location identity gives a hint to the compiler for |
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461 * improved global value numbering. |
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462 * |
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463 * @param receiver the object that is written to |
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464 * @param offset the offset at which to write to the object in bytes |
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465 * @param value the value to be written |
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466 * @param locationIdentity the location identity token that can be used for improved global |
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467 * value numbering or null |
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468 */ |
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469 public static void unsafePutDouble(Object receiver, long offset, double value, Object locationIdentity) { |
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470 UNSAFE.putDouble(receiver, offset, value); |
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471 } |
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472 |
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473 /** |
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474 * Write an Object value within an object. The location identity gives a hint to the compiler |
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475 * for improved global value numbering. |
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476 * |
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477 * @param receiver the object that is written to |
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478 * @param offset the offset at which to write to the object in bytes |
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479 * @param value the value to be written |
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480 * @param locationIdentity the location identity token that can be used for improved global |
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481 * value numbering or null |
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482 */ |
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483 public static void unsafePutObject(Object receiver, long offset, Object value, Object locationIdentity) { |
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484 UNSAFE.putObject(receiver, offset, value); |
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485 } |
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486 |
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487 /** |
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488 * Unsafe access to a final boolean value within an object. The condition parameter gives a hint |
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489 * to the compiler under which circumstances this access can be moved to an earlier location in |
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490 * the program. The location identity gives a hint to the compiler for improved global value |
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491 * numbering. |
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492 * |
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493 * @param receiver the object that is accessed |
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494 * @param offset the offset at which to access the object in bytes |
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495 * @param condition the condition that makes this access safe also at an earlier location in the |
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496 * program |
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497 * @param locationIdentity the location identity token that can be used for improved global |
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498 * value numbering or null |
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499 * @return the accessed value |
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500 */ |
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501 public static boolean unsafeGetFinalBoolean(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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502 return UNSAFE.getBoolean(receiver, offset); |
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503 } |
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504 |
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505 /** |
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506 * Unsafe access to a final byte value within an object. The condition parameter gives a hint to |
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507 * the compiler under which circumstances this access can be moved to an earlier location in the |
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508 * program. The location identity gives a hint to the compiler for improved global value |
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509 * numbering. |
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510 * |
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511 * @param receiver the object that is accessed |
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512 * @param offset the offset at which to access the object in bytes |
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513 * @param condition the condition that makes this access safe also at an earlier location in the |
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514 * program |
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515 * @param locationIdentity the location identity token that can be used for improved global |
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516 * value numbering or null |
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517 * @return the accessed value |
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518 */ |
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519 public static byte unsafeGetFinalByte(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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520 return UNSAFE.getByte(receiver, offset); |
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521 } |
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522 |
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523 /** |
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524 * Unsafe access to a final short value within an object. The condition parameter gives a hint |
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525 * to the compiler under which circumstances this access can be moved to an earlier location in |
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526 * the program. The location identity gives a hint to the compiler for improved global value |
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527 * numbering. |
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528 * |
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529 * @param receiver the object that is accessed |
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530 * @param offset the offset at which to access the object in bytes |
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531 * @param condition the condition that makes this access safe also at an earlier location in the |
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532 * program |
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533 * @param locationIdentity the location identity token that can be used for improved global |
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534 * value numbering or null |
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535 * @return the accessed value |
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536 */ |
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537 public static short unsafeGetFinalShort(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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538 return UNSAFE.getShort(receiver, offset); |
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539 } |
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540 |
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541 /** |
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542 * Unsafe access to a final int value within an object. The condition parameter gives a hint to |
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543 * the compiler under which circumstances this access can be moved to an earlier location in the |
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544 * program. The location identity gives a hint to the compiler for improved global value |
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545 * numbering. |
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546 * |
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547 * @param receiver the object that is accessed |
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548 * @param offset the offset at which to access the object in bytes |
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549 * @param condition the condition that makes this access safe also at an earlier location in the |
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550 * program |
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551 * @param locationIdentity the location identity token that can be used for improved global |
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552 * value numbering or null |
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553 * @return the accessed value |
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554 */ |
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555 public static int unsafeGetFinalInt(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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556 return UNSAFE.getInt(receiver, offset); |
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557 } |
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558 |
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559 /** |
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560 * Unsafe access to a final long value within an object. The condition parameter gives a hint to |
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561 * the compiler under which circumstances this access can be moved to an earlier location in the |
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562 * program. The location identity gives a hint to the compiler for improved global value |
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563 * numbering. |
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564 * |
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565 * @param receiver the object that is accessed |
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566 * @param offset the offset at which to access the object in bytes |
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567 * @param condition the condition that makes this access safe also at an earlier location in the |
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568 * program |
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569 * @param locationIdentity the location identity token that can be used for improved global |
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570 * value numbering or null |
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571 * @return the accessed value |
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572 */ |
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573 public static long unsafeGetFinalLong(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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574 return UNSAFE.getLong(receiver, offset); |
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575 } |
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|
576 |
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|
577 /** |
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|
578 * Unsafe access to a final float value within an object. The condition parameter gives a hint |
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|
579 * to the compiler under which circumstances this access can be moved to an earlier location in |
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580 * the program. The location identity gives a hint to the compiler for improved global value |
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581 * numbering. |
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582 * |
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583 * @param receiver the object that is accessed |
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584 * @param offset the offset at which to access the object in bytes |
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experimental CompilerDirectives.unsafeGetFinal*
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|
585 * @param condition the condition that makes this access safe also at an earlier location in the |
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586 * program |
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587 * @param locationIdentity the location identity token that can be used for improved global |
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588 * value numbering or null |
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589 * @return the accessed value |
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590 */ |
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591 public static float unsafeGetFinalFloat(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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592 return UNSAFE.getFloat(receiver, offset); |
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|
593 } |
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|
594 |
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|
595 /** |
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|
596 * Unsafe access to a final double value within an object. The condition parameter gives a hint |
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|
597 * to the compiler under which circumstances this access can be moved to an earlier location in |
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|
598 * the program. The location identity gives a hint to the compiler for improved global value |
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|
599 * numbering. |
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600 * |
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601 * @param receiver the object that is accessed |
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602 * @param offset the offset at which to access the object in bytes |
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experimental CompilerDirectives.unsafeGetFinal*
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|
603 * @param condition the condition that makes this access safe also at an earlier location in the |
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604 * program |
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605 * @param locationIdentity the location identity token that can be used for improved global |
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|
606 * value numbering or null |
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607 * @return the accessed value |
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|
608 */ |
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609 public static double unsafeGetFinalDouble(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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610 return UNSAFE.getDouble(receiver, offset); |
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611 } |
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|
612 |
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|
613 /** |
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|
614 * Unsafe access to a final Object value within an object. The condition parameter gives a hint |
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|
615 * to the compiler under which circumstances this access can be moved to an earlier location in |
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616 * the program. The location identity gives a hint to the compiler for improved global value |
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617 * numbering. |
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618 * |
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619 * @param receiver the object that is accessed |
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620 * @param offset the offset at which to access the object in bytes |
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621 * @param condition the condition that makes this access safe also at an earlier location in the |
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622 * program |
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623 * @param locationIdentity the location identity token that can be used for improved global |
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624 * value numbering or null |
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625 * @return the accessed value |
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626 */ |
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627 public static Object unsafeGetFinalObject(Object receiver, long offset, boolean condition, Object locationIdentity) { |
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628 return UNSAFE.getObject(receiver, offset); |
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629 } |
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630 |
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631 /** |
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632 * Marks a method that it is considered as a boundary for Truffle partial evaluation. |
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633 */ |
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634 @Retention(RetentionPolicy.RUNTIME) |
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635 @Target({ElementType.METHOD}) |
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636 public @interface TruffleBoundary { |
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637 } |
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638 |
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639 /** |
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640 * Marks classes as value types. Reference comparisons (==) between instances of those classes |
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641 * have undefined semantics and can either return true or false. |
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642 */ |
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643 @Retention(RetentionPolicy.RUNTIME) |
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644 @Target({ElementType.TYPE}) |
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645 public @interface ValueType { |
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646 } |
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647 |
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648 /** |
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649 * Ensures that the given object is not virtual, i.e., not removed by Escape Analysis at the |
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650 * point of this call. |
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651 * |
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652 * @param obj the object to exclude from Escape Analysis |
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653 */ |
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654 public static void materialize(Object obj) { |
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655 } |
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656 } |