0
|
1 /*
|
|
2 * Copyright 2003-2004 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.oops.Oop;
|
|
30 import sun.jvm.hotspot.oops.ObjectHeap;
|
|
31 import sun.jvm.hotspot.types.*;
|
|
32 import sun.jvm.hotspot.runtime.*;
|
|
33
|
|
34 public class BasicHashtableEntry extends VMObject {
|
|
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 Type type = db.lookupType("BasicHashtableEntry");
|
|
45 hashField = type.getCIntegerField("_hash");
|
|
46 nextField = type.getAddressField("_next");
|
|
47 }
|
|
48
|
|
49 // Fields
|
|
50 private static CIntegerField hashField;
|
|
51 private static AddressField nextField;
|
|
52
|
|
53 // Accessors
|
|
54 public long hash() {
|
|
55 return hashField.getValue(addr) & 0xFFFFFFFFL;
|
|
56 }
|
|
57
|
|
58 private long nextAddressValue() {
|
|
59 Debugger dbg = VM.getVM().getDebugger();
|
|
60 Address nextValue = nextField.getValue(addr);
|
|
61 return (nextValue != null) ? dbg.getAddressValue(nextValue) : 0L;
|
|
62 }
|
|
63
|
|
64 public boolean isShared() {
|
|
65 return (nextAddressValue() & 1L) != 0;
|
|
66 }
|
|
67
|
|
68 public BasicHashtableEntry next() {
|
|
69 Address nextValue = nextField.getValue(addr);
|
|
70 Address next = (nextValue != null)? nextValue.andWithMask(-2L) : null;
|
|
71 // using this.getClass so that return type will be as expected in
|
|
72 // subclass context. But, because we can't use covariant return type
|
|
73 // caller has to use this next and cast the result to correct type.
|
|
74 return (BasicHashtableEntry) VMObjectFactory.newObject(this.getClass(), next);
|
|
75 }
|
|
76
|
|
77 public BasicHashtableEntry(Address addr) {
|
|
78 super(addr);
|
|
79 }
|
|
80 }
|