Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/memory/Dictionary.java @ 2177:3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank
author | coleenp |
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date | Thu, 27 Jan 2011 16:11:27 -0800 |
parents | c18cbe5936b8 |
children | da91efe96a93 |
rev | line source |
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0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 package sun.jvm.hotspot.memory; | |
26 | |
27 import java.util.*; | |
28 import sun.jvm.hotspot.debugger.*; | |
29 import sun.jvm.hotspot.oops.*; | |
30 import sun.jvm.hotspot.types.*; | |
31 import sun.jvm.hotspot.runtime.*; | |
32 import sun.jvm.hotspot.utilities.*; | |
33 | |
34 public class Dictionary extends TwoOopHashtable { | |
35 static { | |
36 VM.registerVMInitializedObserver(new Observer() { | |
37 public void update(Observable o, Object data) { | |
38 initialize(VM.getVM().getTypeDataBase()); | |
39 } | |
40 }); | |
41 } | |
42 | |
43 private static synchronized void initialize(TypeDataBase db) { | |
44 // just checking that the type exists | |
45 Type type = db.lookupType("Dictionary"); | |
46 } | |
47 | |
48 public Dictionary(Address addr) { | |
49 super(addr); | |
50 } | |
51 | |
52 // this is overriden here so that Hashtable.bucket will return | |
53 // object of DictionaryEntry.class | |
54 protected Class getHashtableEntryClass() { | |
55 return DictionaryEntry.class; | |
56 } | |
57 | |
58 /** Iterate over all klasses in dictionary; just the classes from | |
59 declaring class loaders */ | |
60 public void classesDo(SystemDictionary.ClassVisitor v) { | |
61 ObjectHeap heap = VM.getVM().getObjectHeap(); | |
62 int tblSize = tableSize(); | |
63 for (int index = 0; index < tblSize; index++) { | |
64 for (DictionaryEntry probe = (DictionaryEntry) bucket(index); probe != null; | |
65 probe = (DictionaryEntry) probe.next()) { | |
66 Oop k = probe.klass(); | |
67 if (k.isKlass() && | |
68 heap.equal(probe.loader(), ((InstanceKlass) k).getClassLoader())) { | |
69 v.visit((Klass) k); | |
70 } | |
71 } | |
72 } | |
73 } | |
74 | |
75 /** All classes, and their class loaders */ | |
76 public void classesDo(SystemDictionary.ClassAndLoaderVisitor v) { | |
77 int tblSize = tableSize(); | |
78 for (int index = 0; index < tblSize; index++) { | |
79 for (DictionaryEntry probe = (DictionaryEntry) bucket(index); probe != null; | |
80 probe = (DictionaryEntry) probe.next()) { | |
81 Oop k = probe.klass(); | |
82 if (k.isKlass()) { | |
83 v.visit((Klass) k, probe.loader()); | |
84 } | |
85 } | |
86 } | |
87 } | |
88 | |
89 public Klass find(int index, long hash, Symbol className, Oop classLoader, Oop protectionDomain) { | |
90 DictionaryEntry entry = getEntry(index, hash, className, classLoader); | |
91 if (entry != null && entry.isValidProtectionDomain(protectionDomain)) { | |
92 return entry.klass(); | |
93 } | |
94 return null; | |
95 } | |
96 | |
97 // - Internals only below this point | |
98 | |
99 private DictionaryEntry getEntry(int index, long hash, Symbol className, Oop classLoader) { | |
100 for (DictionaryEntry entry = (DictionaryEntry) bucket(index); entry != null; | |
101 entry = (DictionaryEntry) entry.next()) { | |
102 if (entry.hash() == hash && entry.equals(className, classLoader)) { | |
103 return entry; | |
104 } | |
105 } | |
106 return null; | |
107 } | |
108 } |