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comparison agent/src/share/classes/sun/jvm/hotspot/runtime/ObjectSynchronizer.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2001-2007 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
29 import sun.jvm.hotspot.oops.*;
30 import sun.jvm.hotspot.utilities.*;
31 import sun.jvm.hotspot.debugger.*;
32 import sun.jvm.hotspot.types.*;
33
34 public class ObjectSynchronizer {
35 static {
36 VM.registerVMInitializedObserver(new Observer() {
37 public void update(Observable o, Object data) {
38 initialize(VM.getVM().getTypeDataBase());
39 }
40 });
41 }
42
43 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
44 Type type;
45 try {
46 type = db.lookupType("ObjectSynchronizer");
47 AddressField blockListField;
48 blockListField = type.getAddressField("gBlockList");
49 gBlockListAddr = blockListField.getValue();
50 blockSize = db.lookupIntConstant("ObjectSynchronizer::_BLOCKSIZE").intValue();
51 } catch (RuntimeException e) { }
52 type = db.lookupType("ObjectMonitor");
53 objectMonitorTypeSize = type.getSize();
54 }
55
56 public long identityHashValueFor(Oop obj) {
57 Mark mark = obj.getMark();
58 if (mark.isUnlocked()) {
59 // FIXME: can not generate marks in debugging system
60 return mark.hash();
61 } else if (mark.hasMonitor()) {
62 ObjectMonitor monitor = mark.monitor();
63 Mark temp = monitor.header();
64 return temp.hash();
65 } else {
66 if (Assert.ASSERTS_ENABLED) {
67 Assert.that(VM.getVM().isDebugging(), "Can not access displaced header otherwise");
68 }
69 if (mark.hasDisplacedMarkHelper()) {
70 Mark temp = mark.displacedMarkHelper();
71 return temp.hash();
72 }
73 // FIXME: can not do anything else here in debugging system
74 return 0;
75 }
76 }
77
78 public static Iterator objectMonitorIterator() {
79 if (gBlockListAddr != null) {
80 return new ObjectMonitorIterator();
81 } else {
82 return null;
83 }
84 }
85
86 private static class ObjectMonitorIterator implements Iterator {
87
88 // JVMTI raw monitors are not pointed by gBlockList
89 // and are not included by this Iterator. May add them later.
90
91 ObjectMonitorIterator() {
92 blockAddr = gBlockListAddr;
93 index = blockSize - 1;
94 block = new ObjectMonitor(blockAddr);
95 }
96
97 public boolean hasNext() {
98 return (index > 0 || block.freeNext() != null);
99 }
100
101 public Object next() {
102 Address addr;
103 if (index > 0) {
104 addr = blockAddr.addOffsetTo(index*objectMonitorTypeSize);
105 } else {
106 blockAddr = block.freeNext();
107 index = blockSize - 1;
108 addr = blockAddr.addOffsetTo(index*objectMonitorTypeSize);
109 }
110 index --;
111 return new ObjectMonitor(addr);
112 }
113
114 public void remove() {
115 throw new UnsupportedOperationException();
116 }
117
118 private ObjectMonitor block;
119 private int index;
120 private Address blockAddr;
121 }
122
123 private static Address gBlockListAddr;
124 private static int blockSize;
125 private static long objectMonitorTypeSize;
126
127 }