Mercurial > hg > truffle

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

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial load
author duke
date Sat, 01 Dec 2007 00:00:00 +0000
parents
children c18cbe5936b8
comparison
equal deleted inserted replaced
-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000 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 import sun.jvm.hotspot.debugger.*;
29 import sun.jvm.hotspot.types.*;
30
31 public class JNIHandles {
32 private static AddressField globalHandlesField;
33 private static AddressField weakGlobalHandlesField;
34 private static OopField deletedHandleField;
35
36 static {
37 VM.registerVMInitializedObserver(new Observer() {
38 public void update(Observable o, Object data) {
39 initialize(VM.getVM().getTypeDataBase());
40 }
41 });
42 }
43
44 private static synchronized void initialize(TypeDataBase db) {
45 Type type = db.lookupType("JNIHandles");
46
47 globalHandlesField = type.getAddressField("_global_handles");
48 weakGlobalHandlesField = type.getAddressField("_weak_global_handles");
49 deletedHandleField = type.getOopField("_deleted_handle");
50
51 }
52
53 public JNIHandles() {
54 }
55
56 public JNIHandleBlock globalHandles() {
57 Address handleAddr = globalHandlesField.getValue();
58 if (handleAddr == null) {
59 return null;
60 }
61 return new JNIHandleBlock(handleAddr);
62 }
63
64 public JNIHandleBlock weakGlobalHandles() {
65 Address handleAddr = weakGlobalHandlesField.getValue();
66 if (handleAddr == null) {
67 return null;
68 }
69 return new JNIHandleBlock(handleAddr);
70 }
71
72 public OopHandle deletedHandle() {
73 return deletedHandleField.getValue();
74 }
75
76 public boolean isDeletedHandle(OopHandle handle) {
77 return (handle != null && handle.equals(deletedHandle()));
78 }
79
80 }