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comparison agent/src/share/classes/sun/jvm/hotspot/utilities/Hashtable.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.utilities;
26
27 import java.util.*;
28 import sun.jvm.hotspot.debugger.*;
29 import sun.jvm.hotspot.types.*;
30 import sun.jvm.hotspot.runtime.*;
31
32 public class Hashtable extends BasicHashtable {
33 static {
34 VM.registerVMInitializedObserver(new Observer() {
35 public void update(Observable o, Object data) {
36 initialize(VM.getVM().getTypeDataBase());
37 }
38 });
39 }
40
41 private static synchronized void initialize(TypeDataBase db) {
42 // just to confirm that type exists
43 Type type = db.lookupType("Hashtable");
44 }
45
46 // derived class may return Class<? extends HashtableEntry>
47 protected Class getHashtableEntryClass() {
48 return HashtableEntry.class;
49 }
50
51 public int hashToIndex(long fullHash) {
52 return (int) (fullHash % tableSize());
53 }
54
55 public Hashtable(Address addr) {
56 super(addr);
57 }
58
59 // VM's Hashtable::hash_symbol
60 protected static long hashSymbol(byte[] buf) {
61 long h = 0;
62 int s = 0;
63 int len = buf.length;
64 while (len-- > 0) {
65 h = 31*h + (0xFFL & buf[s]);
66 s++;
67 }
68 return h & 0xFFFFFFFFL;
69 }
70 }