Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/oops/ConstantPoolCache.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 | 6a991dcb52bb |
| children | bd7a7ce2e264 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 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.oops; | |
| 26 | |
| 27 import java.io.*; | |
| 28 import java.util.*; | |
| 29 import sun.jvm.hotspot.debugger.*; | |
| 30 import sun.jvm.hotspot.runtime.*; | |
| 31 import sun.jvm.hotspot.types.*; | |
| 32 import sun.jvm.hotspot.utilities.*; | |
| 33 | |
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34 // ConstantPoolCache : A constant pool cache (ConstantPoolCache). |
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35 // See cpCache.hpp for details about this class. |
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36 // |
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37 public class ConstantPoolCache extends Metadata { |
| 0 | 38 static { |
| 39 VM.registerVMInitializedObserver(new Observer() { | |
| 40 public void update(Observable o, Object data) { | |
| 41 initialize(VM.getVM().getTypeDataBase()); | |
| 42 } | |
| 43 }); | |
| 44 } | |
| 45 | |
| 46 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { | |
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47 Type type = db.lookupType("ConstantPoolCache"); |
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48 constants = new MetadataField(type.getAddressField("_constant_pool"), 0); |
| 0 | 49 baseOffset = type.getSize(); |
| 50 Type elType = db.lookupType("ConstantPoolCacheEntry"); | |
| 51 elementSize = elType.getSize(); | |
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52 length = new CIntField(type.getCIntegerField("_length"), 0); |
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53 intSize = VM.getVM().getObjectHeap().getIntSize(); |
| 0 | 54 } |
| 55 | |
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56 public ConstantPoolCache(Address addr) { |
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57 super(addr); |
| 0 | 58 } |
| 59 | |
| 60 public boolean isConstantPoolCache() { return true; } | |
| 61 | |
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62 private static MetadataField constants; |
| 0 | 63 |
| 64 private static long baseOffset; | |
| 65 private static long elementSize; | |
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66 private static CIntField length; |
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67 private static long intSize; |
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68 |
| 0 | 69 |
| 70 public ConstantPool getConstants() { return (ConstantPool) constants.getValue(this); } | |
| 71 | |
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72 public long getSize() { |
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73 return Oop.alignObjectSize(baseOffset + getLength() * elementSize); |
| 0 | 74 } |
| 75 | |
| 76 public ConstantPoolCacheEntry getEntryAt(int i) { | |
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77 if (i < 0 || i >= getLength()) throw new IndexOutOfBoundsException(i + " " + getLength()); |
| 0 | 78 return new ConstantPoolCacheEntry(this, i); |
| 79 } | |
| 80 | |
| 81 public int getIntAt(int entry, int fld) { | |
| 82 //alignObjectSize ? | |
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83 long offset = baseOffset + /*alignObjectSize*/entry * elementSize + fld * intSize; |
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84 return (int) getAddress().getCIntegerAt(offset, intSize, true ); |
| 0 | 85 } |
| 86 | |
| 87 | |
| 88 public void printValueOn(PrintStream tty) { | |
| 89 tty.print("ConstantPoolCache for " + getConstants().getPoolHolder().getName().asString()); | |
| 90 } | |
| 91 | |
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92 public int getLength() { |
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93 return (int) length.getValue(getAddress()); |
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94 } |
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95 |
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96 public void iterateFields(MetadataVisitor visitor) { |
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97 super.iterateFields(visitor); |
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98 visitor.doMetadata(constants, true); |
| 0 | 99 for (int i = 0; i < getLength(); i++) { |
| 100 ConstantPoolCacheEntry entry = getEntryAt(i); | |
| 101 entry.iterateFields(visitor); | |
| 102 } | |
| 103 } | |
| 104 }; |