Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/utilities/MethodArray.java @ 6725:da91efe96a93
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 |
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date | Sat, 01 Sep 2012 13:25:18 -0400 |
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6724:36d1d483d5d6 | 6725:da91efe96a93 |
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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.Method; | |
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 MethodArray 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("Method*"); | |
49 | |
50 Type type = db.lookupType("Array<Method*>"); | |
51 dataFieldOffset = type.getAddressField("_data").getOffset(); | |
52 } | |
53 | |
54 private static long dataFieldOffset; | |
55 protected static Type elemType; | |
56 | |
57 public MethodArray(Address addr) { | |
58 super(addr, dataFieldOffset); | |
59 } | |
60 | |
61 public Method at(int i) { | |
62 return (Method) Metadata.instantiateWrapperFor(getAddressAt(i)); | |
63 } | |
64 | |
65 public Type getElemType() { | |
66 return elemType; | |
67 } | |
68 } |