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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/CompilerDirectives.java @ 19309:c386ace07981

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Truffle: move unsafe access methods out of CompilerDirectives
author Andreas Woess <andreas.woess@oracle.com>
date Wed, 11 Feb 2015 18:19:40 +0100
parents f7375de5eaa0
children 9c4168877444
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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>false</code>. This API may be used in combination with {@link #inCompiledCode()} to
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84 * implement compilation constant assertions in the following way:
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85 *
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86 * <pre>
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87 * <code>
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88 * void assertCompilationConstant(Object value) {
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89 * if (inCompiledCode()) {
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90 * if (!isCompilationConstant(value)) {
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91 * throw new AssertionError("Given value is not constant");
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92 * }
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93 * }
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94 * }
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95 * </code>
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96 * </pre>
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97 *
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98 * Note that optimizations that a compiler will apply to code that is conditional on
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99 * <code>isCompilationConstant</code> may be limited. For this reason
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100 * <code>isCompilationConstant</code> is not recommended for use to select between alternate
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101 * implementations of functionality depending on whether a value is constant. Instead, it is
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102 * intended for use as a diagnostic mechanism, such as illustrated above.
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103 *
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104 * @param value
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105 * @return {@code true} when given value is seen as compilation constant, {@code false} if not
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106 * compilation constant.
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107 */
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108 public static boolean isCompilationConstant(Object value) {
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109 return false;
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110 }
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111
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112 /**
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113 * Directive for the compiler that the given runnable should only be executed in the interpreter
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114 * and ignored in the compiled code.
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115 *
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116 * @param runnable the closure that should only be executed in the interpreter
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117 */
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118 public static void interpreterOnly(Runnable runnable) {
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119 runnable.run();
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120 }
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121
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122 /**
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123 * Directive for the compiler that the given callable should only be executed in the
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124 * interpreter.
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125 *
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126 * @param callable the closure that should only be executed in the interpreter
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127 * @return the result of executing the closure in the interpreter and null in the compiled code
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128 * @throws Exception If the closure throws an exception when executed in the interpreter.
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129 */
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130 public static <T> T interpreterOnly(Callable<T> callable) throws Exception {
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131 return callable.call();
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132 }
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133
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134 /**
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135 * Injects a probability for the given condition into the probability information of the
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136 * immediately succeeding branch instruction for the condition. The probability must be a value
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137 * between 0.0 and 1.0 (inclusive). The condition should not be a combined condition.
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138 *
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139 * Example usage immediately before an if statement (it specifies that the likelihood for a to
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140 * be greater than b is 90%):
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141 *
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142 * <code>
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143 * if (injectBranchProbability(0.9, a &gt; b)) {
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144 * // ...
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145 * }
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146 * </code>
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147 *
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148 * Example usage for a combined condition (it specifies that the likelihood for a to be greater
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149 * than b is 90% and under the assumption that this is true, the likelihood for a being 0 is
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150 * 10%):
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151 *
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152 * <code>
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153 * if (injectBranchProbability(0.9, a &gt; b) &amp;&amp; injectBranchProbability(0.1, a == 0)) {
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154 * // ...
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155 * }
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156 * </code>
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157 *
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158 * There are predefined constants for commonly used probabilities (see
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159 * {@link #LIKELY_PROBABILITY} , {@link #UNLIKELY_PROBABILITY}, {@link #SLOWPATH_PROBABILITY},
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160 * {@link #FASTPATH_PROBABILITY} ).
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161 *
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162 * @param probability the probability value between 0.0 and 1.0 that should be injected
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163 */
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164 public static boolean injectBranchProbability(double probability, boolean condition) {
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165 assert probability >= 0.0 && probability <= 1.0;
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166 return condition;
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167 }
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168
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169 /**
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170 * Bails out of a compilation (e.g., for guest language features that should never be compiled).
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171 *
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172 * @param reason the reason for the bailout
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173 */
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174 public static void bailout(String reason) {
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175 }
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176
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177 /**
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178 * Marks fields that should be considered final for a Truffle compilation although they are not
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179 * final while executing in the interpreter.
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180 */
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181 @Retention(RetentionPolicy.RUNTIME)
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182 @Target({ElementType.FIELD})
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183 public @interface CompilationFinal {
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184 }
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185
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186 /**
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187 * Marks a method that it is considered as a boundary for Truffle partial evaluation.
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188 */
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189 @Retention(RetentionPolicy.RUNTIME)
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190 @Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
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191 public @interface TruffleBoundary {
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192 }
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193
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194 /**
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195 * Marks classes as value types. Reference comparisons (==) between instances of those classes
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196 * have undefined semantics and can either return true or false.
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197 */
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198 @Retention(RetentionPolicy.RUNTIME)
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199 @Target({ElementType.TYPE})
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200 public @interface ValueType {
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201 }
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202
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203 /**
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204 * Ensures that the given object is not virtual, i.e., not removed by Escape Analysis at the
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205 * point of this call.
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206 *
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207 * @param obj the object to exclude from Escape Analysis
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208 */
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209 public static void materialize(Object obj) {
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210 }
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211 }