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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/AssumedValue.java @ 20131:4b12d5355811
Truffle: do not use iterators for visitors.
author | Christian Humer <christian.humer@gmail.com> |
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date | Thu, 02 Apr 2015 01:27:27 +0200 |
parents | 935de03661c1 |
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1 /* |
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2 * Copyright (c) 2013, 2014, 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.utilities; |
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26 |
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27 import com.oracle.truffle.api.*; |
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28 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal; |
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29 import com.oracle.truffle.api.nodes.*; |
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30 |
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31 /** |
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32 * A value that the compiler can assume is constant, but can be changed by invalidation. |
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33 * <p> |
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34 * Compiled code that uses the value will be invalidated each time the value changes, so you should |
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35 * take care to only change values infrequently, or to monitor the number of times the value has |
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36 * changed and at some point to replace the value with something more generic so that it does not |
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37 * have to be changed and code does not have to keep being recompiled. |
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38 */ |
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39 public class AssumedValue<T> { |
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40 |
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41 private final String name; |
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42 |
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43 @CompilationFinal private T value; |
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44 @CompilationFinal private Assumption assumption; |
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45 |
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46 public AssumedValue(T initialValue) { |
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47 this(null, initialValue); |
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48 } |
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49 |
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50 public AssumedValue(String name, T initialValue) { |
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51 this.name = name; |
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52 value = initialValue; |
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53 assumption = Truffle.getRuntime().createAssumption(name); |
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54 } |
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55 |
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56 /** |
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57 * Get the current value, updating it if it has been {@link #set}. The compiler may be able to |
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58 * make this method return a constant value, but still accommodate mutation. |
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59 */ |
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60 public T get() { |
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61 try { |
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62 assumption.check(); |
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63 } catch (InvalidAssumptionException e) { |
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64 // No need to rewrite anything - just pick up the new values |
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65 } |
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66 |
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67 return value; |
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68 } |
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69 |
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70 /** |
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71 * Set a new value, which will be picked up the next time {@link #get} is called. |
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72 */ |
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73 public void set(T newValue) { |
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74 CompilerDirectives.transferToInterpreter(); |
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75 |
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76 value = newValue; |
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77 final Assumption oldAssumption = assumption; |
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78 assumption = Truffle.getRuntime().createAssumption(name); |
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79 oldAssumption.invalidate(); |
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80 } |
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81 |
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82 } |