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comparison agent/src/share/classes/sun/jvm/hotspot/memory/HeapBlock.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 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.memory;
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 HeapBlock extends VMObject {
33 private static long heapBlockSize;
34 private static Field headerField;
35 // Fields for class Header
36 private static CIntegerField headerLengthField;
37 private static CIntegerField headerUsedField;
38
39 static {
40 VM.registerVMInitializedObserver(new Observer() {
41 public void update(Observable o, Object data) {
42 initialize(VM.getVM().getTypeDataBase());
43 }
44 });
45 }
46
47 private static void initialize(TypeDataBase db) {
48 // HeapBlock
49 Type type = db.lookupType("HeapBlock");
50 heapBlockSize = type.getSize();
51 headerField = type.getField("_header");
52
53 // Header
54 type = db.lookupType("HeapBlock::Header");
55 headerLengthField = type.getCIntegerField("_length");
56 headerUsedField = type.getCIntegerField("_used");
57 }
58
59 public HeapBlock(Address addr) {
60 super(addr);
61 }
62
63 public long getLength() {
64 return getHeader().getLength();
65 }
66
67 public boolean isFree() {
68 return getHeader().isFree();
69 }
70
71 public Address getAllocatedSpace() {
72 return addr.addOffsetTo(heapBlockSize);
73 }
74
75 //--------------------------------------------------------------------------------
76 // Internals only below this point
77 //
78
79 public static class Header extends VMObject {
80 public Header(Address addr) {
81 super(addr);
82 }
83
84 public long getLength() {
85 return headerLengthField.getValue(addr);
86 }
87
88 public boolean isFree() {
89 return (headerUsedField.getValue(addr) == 0);
90 }
91 }
92
93 private Header getHeader() {
94 return (Header) VMObjectFactory.newObject(HeapBlock.Header.class, addr.addOffsetTo(headerField.getOffset()));
95 }
96 }