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comparison 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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21555:d12eaef9af72 21556:48c1ebd24120
1 /*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.oracle.jvmci.meta;
24
25 import java.util.*;
26 import java.util.function.*;
27
28 /**
29 * An object that can be assigned a globally unique identifier for use as a key in a
30 * {@link MethodIdMap}.
31 */
32 public interface MethodIdHolder {
33 /**
34 * Sets the unique, positive, non-zero identifier for this method.
35 */
36 void setMethodId(int id);
37
38 /**
39 * Gets the identifier set by {@link #setMethodId(int)} or 0 if no identifier was assigned to
40 * this method.
41 */
42 int getMethodId();
43
44 /**
45 * A singleton class for allocating globally unique method identifiers.
46 */
47 static final class MethodIdAllocator {
48
49 /**
50 * Ensures a given method has a unique identifier.
51 */
52 public int assignId(MethodIdHolder holder) {
53 assert Thread.holdsLock(instance) : "must only be called from within MethodIdHolder.allocateIds";
54 int id = holder.getMethodId();
55 if (id == 0) {
56 id = nextId++;
57 holder.setMethodId(id);
58 if (idVerifierMap != null) {
59 idVerifierMap.put(holder, id);
60 }
61 } else {
62 assert !idVerifierMap.containsKey(holder) || idVerifierMap.get(holder) == id;
63 }
64 return id;
65 }
66
67 private int nextId = 1;
68 private final Map<MethodIdHolder, Integer> idVerifierMap;
69
70 @SuppressWarnings("all")
71 private MethodIdAllocator() {
72 boolean assertionsEnabled = false;
73 assert assertionsEnabled = true;
74 idVerifierMap = assertionsEnabled ? new HashMap<>() : null;
75 }
76
77 /**
78 * Singleton instance.
79 */
80 private static final MethodIdAllocator instance = new MethodIdAllocator();
81 }
82
83 /**
84 * Executes some given code that ensures some set of {@link ResolvedJavaMethod}s have unique ids
85 * {@linkplain MethodIdHolder#setMethodId(int) assigned} to them. The
86 * {@link Consumer#accept(Object)} method of the given object is called under a global lock.
87 */
88 static void assignIds(Consumer<MethodIdAllocator> methodIdConsumer) {
89 synchronized (MethodIdAllocator.instance) {
90 methodIdConsumer.accept(MethodIdAllocator.instance);
91 }
92 }
93 }