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comparison agent/src/share/classes/sun/jvm/hotspot/oops/Metadata.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
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6724:36d1d483d5d6 6725:da91efe96a93
1 /*
2 * Copyright (c) 2012, 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.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.utilities.*;
30 import sun.jvm.hotspot.debugger.*;
31 import sun.jvm.hotspot.runtime.*;
32 import sun.jvm.hotspot.types.*;
33
34 abstract public class Metadata extends VMObject {
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 public Metadata(Address addr) {
44 super(addr);
45 }
46
47 private static VirtualBaseConstructor<Metadata> metadataConstructor;
48
49 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
50 metadataConstructor = new VirtualBaseConstructor<Metadata>(db, db.lookupType("Metadata"), null, null);
51 // Define an explicit mapping since the C++ and Java type names don't match.
52 metadataConstructor.addMapping("Metadata", Metadata.class);
53 metadataConstructor.addMapping("Klass", Klass.class);
54 metadataConstructor.addMapping("InstanceKlass", InstanceKlass.class);
55 metadataConstructor.addMapping("instanceMirrorKlass", InstanceMirrorKlass.class);
56 metadataConstructor.addMapping("instanceRefKlass", InstanceRefKlass.class);
57 metadataConstructor.addMapping("instanceClassLoaderKlass", InstanceClassLoaderKlass.class);
58 metadataConstructor.addMapping("typeArrayKlass", TypeArrayKlass.class);
59 metadataConstructor.addMapping("objArrayKlass", ObjArrayKlass.class);
60 metadataConstructor.addMapping("Method", Method.class);
61 metadataConstructor.addMapping("MethodData", MethodData.class);
62 metadataConstructor.addMapping("ConstMethod", ConstMethod.class);
63 metadataConstructor.addMapping("ConstantPool", ConstantPool.class);
64 metadataConstructor.addMapping("ConstantPoolCache", ConstantPoolCache.class);
65 }
66
67 public static Metadata instantiateWrapperFor(Address addr) {
68 return metadataConstructor.instantiateWrapperFor(addr);
69 }
70
71 public void iterate(MetadataVisitor visitor) {
72 visitor.setObj(this);
73 visitor.prologue();
74 iterateFields(visitor);
75 visitor.epilogue();
76 }
77
78 void iterateFields(MetadataVisitor visitor) {
79 }
80
81 abstract public void printValueOn(PrintStream tty);
82 }