Mercurial > hg > graal-compiler
annotate graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/MethodIdHolder.java @ 21623:d2113f5ae550
Merge.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sun, 31 May 2015 23:58:09 +0200 |
parents | 48c1ebd24120 |
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1 /* |
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2 * Copyright (c) 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. |
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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.jvmci.meta; |
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24 |
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25 import java.util.*; |
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26 import java.util.function.*; |
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27 |
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28 /** |
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29 * An object that can be assigned a globally unique identifier for use as a key in a |
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30 * {@link MethodIdMap}. |
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31 */ |
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32 public interface MethodIdHolder { |
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33 /** |
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34 * Sets the unique, positive, non-zero identifier for this method. |
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35 */ |
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36 void setMethodId(int id); |
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37 |
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38 /** |
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39 * Gets the identifier set by {@link #setMethodId(int)} or 0 if no identifier was assigned to |
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40 * this method. |
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41 */ |
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42 int getMethodId(); |
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43 |
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44 /** |
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45 * A singleton class for allocating globally unique method identifiers. |
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46 */ |
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47 static final class MethodIdAllocator { |
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48 |
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49 /** |
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50 * Ensures a given method has a unique identifier. |
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51 */ |
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52 public int assignId(MethodIdHolder holder) { |
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53 assert Thread.holdsLock(instance) : "must only be called from within MethodIdHolder.allocateIds"; |
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54 int id = holder.getMethodId(); |
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55 if (id == 0) { |
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56 id = nextId++; |
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57 holder.setMethodId(id); |
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58 if (idVerifierMap != null) { |
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59 idVerifierMap.put(holder, id); |
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60 } |
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61 } else { |
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62 assert !idVerifierMap.containsKey(holder) || idVerifierMap.get(holder) == id; |
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63 } |
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64 return id; |
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65 } |
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66 |
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67 private int nextId = 1; |
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68 private final Map<MethodIdHolder, Integer> idVerifierMap; |
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69 |
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70 @SuppressWarnings("all") |
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71 private MethodIdAllocator() { |
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72 boolean assertionsEnabled = false; |
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73 assert assertionsEnabled = true; |
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74 idVerifierMap = assertionsEnabled ? new HashMap<>() : null; |
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75 } |
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76 |
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77 /** |
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78 * Singleton instance. |
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79 */ |
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80 private static final MethodIdAllocator instance = new MethodIdAllocator(); |
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81 } |
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82 |
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83 /** |
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84 * Executes some given code that ensures some set of {@link ResolvedJavaMethod}s have unique ids |
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85 * {@linkplain MethodIdHolder#setMethodId(int) assigned} to them. The |
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86 * {@link Consumer#accept(Object)} method of the given object is called under a global lock. |
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87 */ |
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88 static void assignIds(Consumer<MethodIdAllocator> methodIdConsumer) { |
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89 synchronized (MethodIdAllocator.instance) { |
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90 methodIdConsumer.accept(MethodIdAllocator.instance); |
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91 } |
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92 } |
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93 } |