Mercurial > hg > graal-compiler
annotate agent/src/share/classes/sun/jvm/hotspot/utilities/RobustOopDeterminator.java @ 6848:8e47bac5643a
7054512: Compress class pointers after perm gen removal
Summary: support of compress class pointers in the compilers.
Reviewed-by: kvn, twisti
| author | roland |
|---|---|
| date | Tue, 09 Oct 2012 10:11:38 +0200 |
| parents | da91efe96a93 |
| children |
| rev | line source |
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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 } |