Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/runtime/JNIHandles.java @ 18665:96861e3f8cc5
made CFGPrinterObserver reset (upon close) properly
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 11 Dec 2014 22:14:30 +0100 |
parents | c18cbe5936b8 |
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0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved. |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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21 * questions. |
0 | 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 } |