Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/CompilerDirectives.java @ 21648:610d76a131cd
Merge with 4c146c9367b639ca173f0b0381804b4f50aca822
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Sun, 31 May 2015 17:23:14 -0700 |
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1 /* |
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2 * Copyright (c) 2013, 2015, 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.util.concurrent.*; |
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29 |
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30 /** |
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31 * Directives that influence the optimizations of the Truffle compiler. All of the operations have |
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32 * no effect when executed in the Truffle interpreter. |
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33 */ |
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34 public final class CompilerDirectives { |
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35 |
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36 public static final double LIKELY_PROBABILITY = 0.75; |
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37 public static final double UNLIKELY_PROBABILITY = 1.0 - LIKELY_PROBABILITY; |
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38 |
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39 public static final double SLOWPATH_PROBABILITY = 0.0001; |
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40 public static final double FASTPATH_PROBABILITY = 1.0 - SLOWPATH_PROBABILITY; |
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41 |
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42 /** |
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43 * Directive for the compiler to discontinue compilation at this code position and instead |
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44 * insert a transfer to the interpreter. |
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45 */ |
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46 public static void transferToInterpreter() { |
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47 if (inInterpreter()) { |
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48 Truffle.getRuntime().notifyTransferToInterpreter(); |
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49 } |
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50 } |
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51 |
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52 /** |
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53 * Directive for the compiler to discontinue compilation at this code position and instead |
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54 * insert a transfer to the interpreter, invalidating the currently executing machine code. |
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55 */ |
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56 public static void transferToInterpreterAndInvalidate() { |
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57 if (inInterpreter()) { |
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58 Truffle.getRuntime().notifyTransferToInterpreter(); |
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59 } |
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60 } |
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61 |
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62 /** |
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63 * Returns a boolean value indicating whether the method is executed in the interpreter. |
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64 * |
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65 * @return {@code true} when executed in the interpreter, {@code false} in compiled code. |
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66 */ |
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67 public static boolean inInterpreter() { |
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68 return true; |
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69 } |
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70 |
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71 /** |
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72 * Returns a boolean value indicating whether the method is executed in the compiled code. |
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73 * |
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74 * @return {@code false} when executed in the interpreter, {@code true} in compiled code. |
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75 */ |
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76 public static boolean inCompiledCode() { |
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77 return false; |
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78 } |
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79 |
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80 /** |
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81 * Returns a boolean indicating whether or not a given value is seen as constant in optimized |
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82 * code. If this method is called in the interpreter this method will always return |
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83 * <code>true</code>. |
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84 * |
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85 * Note that optimizations that a compiler will apply to code that is conditional on |
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86 * <code>isCompilationConstant</code> may be limited. For this reason |
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87 * <code>isCompilationConstant</code> is not recommended for use to select between alternate |
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88 * implementations of functionality depending on whether a value is constant. Instead, it is |
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89 * intended for use as a diagnostic mechanism. |
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90 * |
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91 * @param value |
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92 * @return {@code true} when given value is seen as compilation constant, {@code false} if not |
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93 * compilation constant. |
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94 */ |
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95 public static boolean isCompilationConstant(Object value) { |
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96 return CompilerDirectives.inInterpreter(); |
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97 } |
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98 |
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99 /** |
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100 * Directive for the compiler that the given runnable should only be executed in the interpreter |
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101 * and ignored in the compiled code. |
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102 * |
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103 * @param runnable the closure that should only be executed in the interpreter |
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104 */ |
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105 public static void interpreterOnly(Runnable runnable) { |
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106 runnable.run(); |
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107 } |
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108 |
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109 /** |
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110 * Directive for the compiler that the given callable should only be executed in the |
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111 * interpreter. |
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112 * |
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113 * @param callable the closure that should only be executed in the interpreter |
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114 * @return the result of executing the closure in the interpreter and null in the compiled code |
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115 * @throws Exception If the closure throws an exception when executed in the interpreter. |
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116 */ |
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117 public static <T> T interpreterOnly(Callable<T> callable) throws Exception { |
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118 return callable.call(); |
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119 } |
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120 |
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121 /** |
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122 * Injects a probability for the given condition into the probability information of the |
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123 * immediately succeeding branch instruction for the condition. The probability must be a value |
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124 * between 0.0 and 1.0 (inclusive). The condition should not be a combined condition. |
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125 * |
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126 * Example usage immediately before an if statement (it specifies that the likelihood for a to |
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127 * be greater than b is 90%): |
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128 * |
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129 * <code> |
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131 * // ... |
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132 * } |
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133 * </code> |
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134 * |
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135 * Example usage for a combined condition (it specifies that the likelihood for a to be greater |
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136 * than b is 90% and under the assumption that this is true, the likelihood for a being 0 is |
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137 * 10%): |
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138 * |
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139 * <code> |
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141 * // ... |
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142 * } |
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143 * </code> |
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144 * |
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145 * There are predefined constants for commonly used probabilities (see |
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146 * {@link #LIKELY_PROBABILITY} , {@link #UNLIKELY_PROBABILITY}, {@link #SLOWPATH_PROBABILITY}, |
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147 * {@link #FASTPATH_PROBABILITY} ). |
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148 * |
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149 * @param probability the probability value between 0.0 and 1.0 that should be injected |
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150 */ |
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151 public static boolean injectBranchProbability(double probability, boolean condition) { |
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152 assert probability >= 0.0 && probability <= 1.0; |
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153 return condition; |
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154 } |
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155 |
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156 /** |
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157 * Bails out of a compilation (e.g., for guest language features that should never be compiled). |
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158 * |
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159 * @param reason the reason for the bailout |
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160 */ |
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161 public static void bailout(String reason) { |
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162 } |
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163 |
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164 /** |
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165 * Marks fields that should be considered final for a Truffle compilation although they are not |
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166 * final while executing in the interpreter. |
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167 */ |
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168 @Retention(RetentionPolicy.RUNTIME) |
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169 @Target({ElementType.FIELD}) |
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170 public @interface CompilationFinal { |
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171 } |
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172 |
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173 /** |
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174 * Marks a method that it is considered as a boundary for Truffle partial evaluation. |
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175 */ |
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176 @Retention(RetentionPolicy.RUNTIME) |
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177 @Target({ElementType.METHOD, ElementType.CONSTRUCTOR}) |
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178 public @interface TruffleBoundary { |
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179 } |
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180 |
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181 /** |
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182 * Marks classes as value types. Reference comparisons (==) between instances of those classes |
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183 * have undefined semantics and can either return true or false. |
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184 */ |
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185 @Retention(RetentionPolicy.RUNTIME) |
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186 @Target({ElementType.TYPE}) |
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187 public @interface ValueType { |
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188 } |
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189 |
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190 /** |
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191 * Ensures that the given object is not virtual, i.e., not removed by Escape Analysis at the |
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192 * point of this call. |
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193 * |
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194 * @param obj the object to exclude from Escape Analysis |
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195 */ |
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196 public static void materialize(Object obj) { |
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197 } |
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159ac409c27a
Fix new line at end of file.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
9282
diff
changeset
|
198 } |