Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/memory/PlaceholderEntry.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 |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 1d1603768966 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.memory; | |
| 26 | |
| 27 import java.util.*; | |
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28 import sun.jvm.hotspot.classfile.ClassLoaderData; |
| 0 | 29 import sun.jvm.hotspot.debugger.*; |
| 30 import sun.jvm.hotspot.oops.*; | |
| 31 import sun.jvm.hotspot.types.*; | |
| 32 import sun.jvm.hotspot.runtime.*; | |
| 33 import sun.jvm.hotspot.utilities.*; | |
| 34 | |
| 35 public class PlaceholderEntry extends sun.jvm.hotspot.utilities.HashtableEntry { | |
| 36 static { | |
| 37 VM.registerVMInitializedObserver(new Observer() { | |
| 38 public void update(Observable o, Object data) { | |
| 39 initialize(VM.getVM().getTypeDataBase()); | |
| 40 } | |
| 41 }); | |
| 42 } | |
| 43 | |
| 44 private static synchronized void initialize(TypeDataBase db) { | |
| 45 Type type = db.lookupType("PlaceholderEntry"); | |
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46 loaderDataField = type.getAddressField("_loader_data"); |
| 0 | 47 } |
| 48 | |
| 49 // Field | |
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50 private static AddressField loaderDataField; |
| 0 | 51 |
| 52 // Accessor | |
| 53 public Oop loader() { | |
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54 return loaderData().getClassLoader(); |
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55 } |
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56 |
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57 public ClassLoaderData loaderData() { |
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58 return ClassLoaderData.instantiateWrapperFor(loaderDataField.getValue(addr)); |
| 0 | 59 } |
| 60 | |
| 61 public PlaceholderEntry(Address addr) { | |
| 62 super(addr); | |
| 63 } | |
| 64 | |
| 65 public Symbol klass() { | |
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66 return Symbol.create(literalValue()); |
| 0 | 67 } |
| 68 | |
| 69 /* covariant return type :-( | |
| 70 public PlaceholderEntry next() { | |
| 71 return (PlaceholderEntry) super.next(); | |
| 72 } | |
| 73 For now, let the caller cast it .. | |
| 74 */ | |
| 75 } |