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annotate agent/src/share/classes/sun/jvm/hotspot/utilities/RobustOopDeterminator.java @ 17467:55fb97c4c58d hs25-b65
8029233: Update copyright year to match last edit in jdk8 hotspot repository for 2013
Summary: Copyright year updated for files modified during 2013
Reviewed-by: twisti, iveresov
author | mikael |
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date | Tue, 24 Dec 2013 11:48:39 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 package sun.jvm.hotspot.utilities; | |
26 | |
27 import java.util.*; | |
28 import sun.jvm.hotspot.debugger.*; | |
29 import sun.jvm.hotspot.memory.*; | |
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30 import sun.jvm.hotspot.oops.Metadata; |
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31 import sun.jvm.hotspot.oops.Klass; |
0 | 32 import sun.jvm.hotspot.runtime.*; |
33 import sun.jvm.hotspot.types.*; | |
34 | |
35 /** This class determines to the best of its ability, and in a | |
36 reasonably robust fashion, whether a given pointer is an intact | |
37 oop or not. It does this by checking the integrity of the | |
38 metaclass hierarchy. This is only intended for use in the | |
39 debugging system. It may provide more resilience to unexpected VM | |
40 states than the ObjectHeap code. */ | |
41 | |
42 public class RobustOopDeterminator { | |
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43 private static AddressField klassField; |
0 | 44 |
45 static { | |
46 VM.registerVMInitializedObserver(new Observer() { | |
47 public void update(Observable o, Object data) { | |
48 initialize(VM.getVM().getTypeDataBase()); | |
49 } | |
50 }); | |
51 } | |
52 | |
53 private static void initialize(TypeDataBase db) { | |
54 Type type = db.lookupType("oopDesc"); | |
55 | |
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56 if (VM.getVM().isCompressedKlassPointersEnabled()) { |
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57 klassField = type.getAddressField("_metadata._compressed_klass"); |
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58 } else { |
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59 klassField = type.getAddressField("_metadata._klass"); |
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60 } |
0 | 61 } |
62 | |
63 public static boolean oopLooksValid(OopHandle oop) { | |
64 if (oop == null) { | |
65 return false; | |
66 } | |
67 if (!VM.getVM().getUniverse().isIn(oop)) { | |
68 return false; | |
69 } | |
70 try { | |
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71 // Try to instantiate the Klass |
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72 if (VM.getVM().isCompressedKlassPointersEnabled()) { |
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73 Metadata.instantiateWrapperFor(oop.getCompKlassAddressAt(klassField.getOffset())); |
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74 } else { |
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75 Metadata.instantiateWrapperFor(klassField.getValue(oop)); |
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76 } |
0 | 77 return true; |
78 } | |
79 catch (AddressException e) { | |
80 return false; | |
81 } | |
82 } | |
83 } |