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.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 }
|