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comparison agent/src/share/classes/sun/jvm/hotspot/utilities/RobustOopDeterminator.java @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents c18cbe5936b8
children 8e47bac5643a
comparison
equal deleted inserted replaced
6724:36d1d483d5d6 6725:da91efe96a93
1 /* 1 /*
2 * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
25 package sun.jvm.hotspot.utilities; 25 package sun.jvm.hotspot.utilities;
26 26
27 import java.util.*; 27 import java.util.*;
28 import sun.jvm.hotspot.debugger.*; 28 import sun.jvm.hotspot.debugger.*;
29 import sun.jvm.hotspot.memory.*; 29 import sun.jvm.hotspot.memory.*;
30 import sun.jvm.hotspot.oops.Metadata;
31 import sun.jvm.hotspot.oops.Klass;
30 import sun.jvm.hotspot.runtime.*; 32 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*; 33 import sun.jvm.hotspot.types.*;
32 34
33 /** This class determines to the best of its ability, and in a 35 /** This class determines to the best of its ability, and in a
34 reasonably robust fashion, whether a given pointer is an intact 36 reasonably robust fashion, whether a given pointer is an intact
36 metaclass hierarchy. This is only intended for use in the 38 metaclass hierarchy. This is only intended for use in the
37 debugging system. It may provide more resilience to unexpected VM 39 debugging system. It may provide more resilience to unexpected VM
38 states than the ObjectHeap code. */ 40 states than the ObjectHeap code. */
39 41
40 public class RobustOopDeterminator { 42 public class RobustOopDeterminator {
41 private static OopField klassField; 43 private static AddressField klassField;
42 44
43 static { 45 static {
44 VM.registerVMInitializedObserver(new Observer() { 46 VM.registerVMInitializedObserver(new Observer() {
45 public void update(Observable o, Object data) { 47 public void update(Observable o, Object data) {
46 initialize(VM.getVM().getTypeDataBase()); 48 initialize(VM.getVM().getTypeDataBase());
49 } 51 }
50 52
51 private static void initialize(TypeDataBase db) { 53 private static void initialize(TypeDataBase db) {
52 Type type = db.lookupType("oopDesc"); 54 Type type = db.lookupType("oopDesc");
53 55
54 if (VM.getVM().isCompressedOopsEnabled()) { 56 if (VM.getVM().isCompressedHeadersEnabled()) {
55 klassField = type.getNarrowOopField("_metadata._compressed_klass"); 57 // klassField = type.getNarrowOopField("_metadata._compressed_klass");
58 throw new InternalError("unimplemented");
56 } else { 59 } else {
57 klassField = type.getOopField("_metadata._klass"); 60 klassField = type.getAddressField("_metadata._klass");
58 } 61 }
59 } 62 }
60 63
61 public static boolean oopLooksValid(OopHandle oop) { 64 public static boolean oopLooksValid(OopHandle oop) {
62 if (oop == null) { 65 if (oop == null) {
64 } 67 }
65 if (!VM.getVM().getUniverse().isIn(oop)) { 68 if (!VM.getVM().getUniverse().isIn(oop)) {
66 return false; 69 return false;
67 } 70 }
68 try { 71 try {
69 for (int i = 0; i < 4; ++i) { 72 // Try to instantiate the Klass
70 OopHandle next = klassField.getValue(oop); 73 Metadata.instantiateWrapperFor(klassField.getValue(oop));
71 if (next == null) {
72 return false;
73 }
74 if (next.equals(oop)) {
75 return true; 74 return true;
76 } 75 }
77 oop = next;
78 }
79 return false;
80 }
81 catch (AddressException e) { 76 catch (AddressException e) {
82 return false; 77 return false;
83 } 78 }
84 } 79 }
85 } 80 }