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comparison agent/src/share/classes/sun/jvm/hotspot/utilities/KlassArray.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.utilities;
26
27 import java.util.Observable;
28 import java.util.Observer;
29
30 import sun.jvm.hotspot.debugger.Address;
31 import sun.jvm.hotspot.oops.Metadata;
32 import sun.jvm.hotspot.oops.Klass;
33 import sun.jvm.hotspot.runtime.VM;
34 import sun.jvm.hotspot.types.Type;
35 import sun.jvm.hotspot.types.TypeDataBase;
36 import sun.jvm.hotspot.types.WrongTypeException;
37
38 public class KlassArray extends GenericArray {
39 static {
40 VM.registerVMInitializedObserver(new Observer() {
41 public void update(Observable o, Object data) {
42 initialize(VM.getVM().getTypeDataBase());
43 }
44 });
45 }
46
47 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
48 elemType = db.lookupType("Klass*");
49
50 Type type = db.lookupType("Array<Klass*>");
51 dataFieldOffset = type.getAddressField("_data").getOffset();
52 }
53
54 private static long dataFieldOffset;
55 protected static Type elemType;
56
57 public KlassArray(Address addr) {
58 super(addr, dataFieldOffset);
59 }
60
61 public Klass getAt(int i) {
62 return (Klass) Metadata.instantiateWrapperFor(getAddressAt(i));
63 }
64
65 public Type getElemType() {
66 return elemType;
67 }
68 }