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comparison agent/src/share/classes/sun/jvm/hotspot/memory/Dictionary.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
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 }