Mercurial > hg > truffle
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/CompilerDirectives.java @ 9313:6369d37b37d1
Added annotation CompilerDirectives.CompilationFinal for fields that should be considered final during compilation, but are not final while executing in the Truffle interpreter.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Thu, 25 Apr 2013 19:43:49 +0200 |
parents | 159ac409c27a |
children | 1188b7c42196 |
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. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.oracle.truffle.api; |
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24 |
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25 import java.lang.annotation.*; |
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26 import java.util.concurrent.*; |
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27 |
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28 /** |
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29 * Directives that influence the optimizations of the Truffle compiler. All of the operations have |
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30 * no effect when executed in the Truffle interpreter. |
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31 */ |
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32 public class CompilerDirectives { |
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33 |
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34 private static final double SLOWPATH_PROBABILITY = 0.0001; |
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35 |
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36 /** |
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37 * Directive for the compiler to discontinue compilation at this code position and instead |
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38 * insert a transfer to the interpreter. |
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39 */ |
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40 public static void transferToInterpreter() { |
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41 } |
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42 |
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43 /** |
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44 * Directive for the compiler that the given runnable should only be executed in the interpreter |
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45 * and ignored in the compiled code. |
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46 * |
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47 * @param runnable the closure that should only be executed in the interpreter |
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48 */ |
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49 public static void interpreterOnly(Runnable runnable) { |
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50 runnable.run(); |
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51 } |
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52 |
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53 /** |
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54 * Directive for the compiler that the given callable should only be executed in the |
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55 * interpreter. |
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56 * |
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57 * @param callable the closure that should only be executed in the interpreter |
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58 * @return the result of executing the closure in the interpreter and null in the compiled code |
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59 * @throws Exception If the closure throws an exception when executed in the interpreter. |
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60 */ |
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61 public static <T> T interpreterOnly(Callable<T> callable) throws Exception { |
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62 return callable.call(); |
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63 } |
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64 |
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65 /** |
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66 * Directive for the compiler that the current path has a very low probability to be executed. |
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67 */ |
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68 public static void slowpath() { |
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69 injectBranchProbability(SLOWPATH_PROBABILITY); |
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70 } |
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71 |
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72 /** |
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73 * Injects a probability for the current path into the probability information of the |
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74 * immediately preceeding branch instruction. |
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75 * |
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76 * @param probability the probability value between 0.0 and 1.0 that should be injected |
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77 */ |
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78 public static void injectBranchProbability(double probability) { |
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79 assert probability >= 0.0 && probability <= 1.0; |
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80 } |
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81 |
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82 /** |
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83 * Bails out of a compilation (e.g., for guest language features that should never be compiled). |
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84 * |
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85 * @param reason the reason for the bailout |
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86 */ |
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87 public static void bailout(String reason) { |
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88 } |
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89 |
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90 /** |
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91 * Marks fields that should be considered final for a Truffle compilation although they are not |
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92 * final while executing in the interpreter. |
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93 */ |
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94 @Retention(RetentionPolicy.RUNTIME) |
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95 @Target({ElementType.FIELD}) |
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96 public @interface CompilationFinal { |
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97 } |
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98 } |