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annotate graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/MethodIdHolder.java @ 21556:48c1ebd24120

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renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 27 May 2015 00:36:16 +0200
parents graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/MethodIdHolder.java@0627ebc2a3ea
children
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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 }