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comparison agent/src/share/classes/sun/jvm/hotspot/oops/ConstantPoolCacheEntry.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 c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2001-2005 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.util.*;
28 import sun.jvm.hotspot.debugger.*;
29 import sun.jvm.hotspot.runtime.*;
30 import sun.jvm.hotspot.types.*;
31
32 public class ConstantPoolCacheEntry {
33 private static long size;
34 private static long baseOffset;
35 private static CIntegerField indices;
36 private static sun.jvm.hotspot.types.OopField f1;
37 private static CIntegerField f2;
38 private static CIntegerField flags;
39
40 private ConstantPoolCache cp;
41 private long offset;
42
43 static {
44 VM.registerVMInitializedObserver(new Observer() {
45 public void update(Observable o, Object data) {
46 initialize(VM.getVM().getTypeDataBase());
47 }
48 });
49 }
50
51 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
52 Type type = db.lookupType("ConstantPoolCacheEntry");
53 size = type.getSize();
54
55 indices = type.getCIntegerField("_indices");
56 f1 = type.getOopField ("_f1");
57 f2 = type.getCIntegerField("_f2");
58 flags = type.getCIntegerField("_flags");
59
60 type = db.lookupType("constantPoolCacheOopDesc");
61 baseOffset = type.getSize();
62 }
63
64 ConstantPoolCacheEntry(ConstantPoolCache cp, int index) {
65 this.cp = cp;
66 offset = baseOffset + index * size;
67 }
68
69 public int getConstantPoolIndex() {
70 return (int) (getIndices() & 0xFFFF);
71 }
72
73 private long getIndices() {
74 return cp.getHandle().getCIntegerAt(indices.getOffset() + offset, indices.getSize(), indices.isUnsigned());
75 }
76
77 public Oop getF1() {
78 return cp.getHeap().newOop(cp.getHandle().getOopHandleAt(f1.getOffset() + offset));
79 }
80
81 public int getF2() {
82 return cp.getHandle().getJIntAt(f1.getOffset() + offset);
83 }
84
85 public int getFlags() {
86 return cp.getHandle().getJIntAt(flags.getOffset() + offset);
87 }
88
89 static NamedFieldIdentifier f1FieldName = new NamedFieldIdentifier("_f1");
90 static NamedFieldIdentifier f2FieldName = new NamedFieldIdentifier("_f2");
91 static NamedFieldIdentifier flagsFieldName = new NamedFieldIdentifier("_flags");
92
93 public void iterateFields(OopVisitor visitor) {
94 visitor.doOop(new OopField(f1FieldName, f1.getOffset() + offset, true), true);
95 visitor.doInt(new IntField(f2FieldName, f2.getOffset() + offset, true), true);
96 visitor.doInt(new IntField(flagsFieldName, flags.getOffset() + offset, true), true);
97 }
98 }