0
|
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 }
|