Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/oops/ConstantPoolCache.java @ 113:ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv
Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
author | coleenp |
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date | Sun, 13 Apr 2008 17:43:42 -0400 |
parents | a61af66fc99e |
children | d1605aabd0a1 |
rev | line source |
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0 | 1 /* |
2 * Copyright 2000-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
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 (constantPoolCacheOopDesc). |
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35 // See cpCacheOop.hpp for details about this class. |
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36 // |
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37 public class ConstantPoolCache extends Oop { |
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 { | |
47 Type type = db.lookupType("constantPoolCacheOopDesc"); | |
48 constants = new OopField(type.getOopField("_constant_pool"), 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); |
0 | 53 } |
54 | |
55 ConstantPoolCache(OopHandle handle, ObjectHeap heap) { | |
56 super(handle, heap); | |
57 } | |
58 | |
59 public boolean isConstantPoolCache() { return true; } | |
60 | |
61 private static OopField constants; | |
62 | |
63 private static long baseOffset; | |
64 private static long elementSize; | |
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65 private static CIntField length; |
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66 |
0 | 67 |
68 public ConstantPool getConstants() { return (ConstantPool) constants.getValue(this); } | |
69 | |
70 public long getObjectSize() { | |
71 return alignObjectSize(baseOffset + getLength() * elementSize); | |
72 } | |
73 | |
74 public ConstantPoolCacheEntry getEntryAt(int i) { | |
75 if (Assert.ASSERTS_ENABLED) { | |
76 Assert.that(0 <= i && i < getLength(), "index out of bounds"); | |
77 } | |
78 return new ConstantPoolCacheEntry(this, i); | |
79 } | |
80 | |
81 public int getIntAt(int entry, int fld) { | |
82 //alignObjectSize ? | |
83 long offset = baseOffset + /*alignObjectSize*/entry * elementSize + fld* getHeap().getIntSize(); | |
84 return (int) getHandle().getCIntegerAt(offset, getHeap().getIntSize(), true ); | |
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(this); |
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94 } |
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95 |
0 | 96 public void iterateFields(OopVisitor visitor, boolean doVMFields) { |
97 super.iterateFields(visitor, doVMFields); | |
98 if (doVMFields) { | |
99 visitor.doOop(constants, true); | |
100 for (int i = 0; i < getLength(); i++) { | |
101 ConstantPoolCacheEntry entry = getEntryAt(i); | |
102 entry.iterateFields(visitor); | |
103 } | |
104 } | |
105 } | |
106 }; |