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comparison agent/src/share/classes/sun/jvm/hotspot/oops/ConstantPoolCache.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children ba764ed4b6f2
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-1:000000000000 0:a61af66fc99e
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
34 // A ConstantPool is an array containing class constants
35 // as described in the class file
36
37 public class ConstantPoolCache extends Array {
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
51 Type elType = db.lookupType("ConstantPoolCacheEntry");
52 elementSize = elType.getSize();
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;
65
66 public ConstantPool getConstants() { return (ConstantPool) constants.getValue(this); }
67
68 public long getObjectSize() {
69 return alignObjectSize(baseOffset + getLength() * elementSize);
70 }
71
72 public ConstantPoolCacheEntry getEntryAt(int i) {
73 if (Assert.ASSERTS_ENABLED) {
74 Assert.that(0 <= i && i < getLength(), "index out of bounds");
75 }
76 return new ConstantPoolCacheEntry(this, i);
77 }
78
79 public int getIntAt(int entry, int fld) {
80 //alignObjectSize ?
81 long offset = baseOffset + /*alignObjectSize*/entry * elementSize + fld* getHeap().getIntSize();
82 return (int) getHandle().getCIntegerAt(offset, getHeap().getIntSize(), true );
83 }
84
85
86 public void printValueOn(PrintStream tty) {
87 tty.print("ConstantPoolCache for " + getConstants().getPoolHolder().getName().asString());
88 }
89
90 public void iterateFields(OopVisitor visitor, boolean doVMFields) {
91 super.iterateFields(visitor, doVMFields);
92 if (doVMFields) {
93 visitor.doOop(constants, true);
94 for (int i = 0; i < getLength(); i++) {
95 ConstantPoolCacheEntry entry = getEntryAt(i);
96 entry.iterateFields(visitor);
97 }
98 }
99 }
100 };