Mercurial > hg > graal-jvmci-8
comparison agent/src/share/classes/sun/jvm/hotspot/runtime/JNIHandles.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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-1:000000000000 | 0:a61af66fc99e |
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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 } |