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comparison agent/src/share/classes/sun/jvm/hotspot/runtime/BasicObjectLock.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 /*
2 * Copyright 2001 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.runtime;
26
27 import java.util.*;
28
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.types.*;
31
32 public class BasicObjectLock extends VMObject {
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) throws WrongTypeException {
42 Type type = db.lookupType("BasicObjectLock");
43 lockField = type.getField("_lock");
44 objField = type.getOopField("_obj");
45 size = (int) type.getSize();
46 }
47
48 private static sun.jvm.hotspot.types.Field lockField;
49 private static sun.jvm.hotspot.types.OopField objField;
50 private static int size;
51
52 public BasicObjectLock(Address addr) {
53 super(addr);
54 }
55
56 public OopHandle obj() { return objField.getValue(addr); }
57 public BasicLock lock() { return new BasicLock(addr.addOffsetTo(lockField.getOffset())); }
58
59 /** Note: Use frame::interpreter_frame_monitor_size() for the size
60 of BasicObjectLocks in interpreter activation frames since it
61 includes machine-specific padding. This routine returns a size
62 in BYTES in this system! */
63 public static int size() { return size; }
64
65 /** Helper routine for Frames (also probably needed for iteration) */
66 public Address address() { return addr; }
67 }