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comparison agent/src/share/classes/sun/jvm/hotspot/oops/java_lang_Class.java @ 2411:63997f575155

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7031614: jmap -permstat fails with java.lang.InternalError in sun.jvm.hotspot.oops.OopField.getValue Reviewed-by: kvn, dcubed
author never
date Wed, 30 Mar 2011 07:47:19 -0700
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children e6b1331a51d2
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2410:fe1dbd98e18f 2411:63997f575155
1 /*
2 * Copyright (c) 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 package sun.jvm.hotspot.oops;
26
27 import java.util.*;
28
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.memory.*;
31 import sun.jvm.hotspot.runtime.*;
32 import sun.jvm.hotspot.types.Type;
33 import sun.jvm.hotspot.types.TypeDataBase;
34 import sun.jvm.hotspot.utilities.*;
35 import sun.jvm.hotspot.jdi.JVMTIThreadState;
36
37 /** A utility class encapsulating useful oop operations */
38
39 // initialize fields for java.lang.Class
40 public class java_lang_Class {
41
42 // java.lang.Class fields
43 static OopField klassField;
44 static IntField oopSizeField;
45
46 static {
47 VM.registerVMInitializedObserver(new Observer() {
48 public void update(Observable o, Object data) {
49 initialize(VM.getVM().getTypeDataBase());
50 }
51 });
52 }
53
54 private static synchronized void initialize(TypeDataBase db) {
55 // klass and oop_size are HotSpot magic fields and hence we can't
56 // find them from InstanceKlass for java.lang.Class.
57 Type jlc = db.lookupType("java_lang_Class");
58 int klassOffset = (int) jlc.getCIntegerField("klass_offset").getValue();
59 if (VM.getVM().isCompressedOopsEnabled()) {
60 klassField = new NarrowOopField(new NamedFieldIdentifier("klass"), klassOffset, true);
61 } else {
62 klassField = new OopField(new NamedFieldIdentifier("klass"), klassOffset, true);
63 }
64 int oopSizeOffset = (int) jlc.getCIntegerField("oop_size_offset").getValue();
65 oopSizeField = new IntField(new NamedFieldIdentifier("oop_size"), oopSizeOffset, true);
66 }
67
68 /** get klassOop field at offset hc_klass_offset from a java.lang.Class object */
69 public static Klass asKlass(Oop aClass) {
70 return (Klass) java_lang_Class.klassField.getValue(aClass);
71 }
72
73 /** get oop_size field at offset oop_size_offset from a java.lang.Class object */
74 public static long getOopSize(Oop aClass) {
75 return java_lang_Class.oopSizeField.getValue(aClass);
76 }
77 }