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comparison agent/src/share/classes/sun/jvm/hotspot/gc_implementation/shared/ImmutableSpace.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2003 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.gc_implementation.shared;
26
27 import java.io.*;
28 import java.util.*;
29
30 import sun.jvm.hotspot.debugger.*;
31 import sun.jvm.hotspot.memory.*;
32 import sun.jvm.hotspot.runtime.*;
33 import sun.jvm.hotspot.types.*;
34
35 public abstract class ImmutableSpace extends VMObject {
36 static {
37 VM.registerVMInitializedObserver(new Observer() {
38 public void update(Observable o, Object data) {
39 initialize(VM.getVM().getTypeDataBase());
40 }
41 });
42 }
43
44 private static synchronized void initialize(TypeDataBase db) {
45 Type type = db.lookupType("ImmutableSpace");
46 bottomField = type.getAddressField("_bottom");
47 endField = type.getAddressField("_end");
48 }
49
50 public ImmutableSpace(Address addr) {
51 super(addr);
52 }
53
54 // Fields
55 private static AddressField bottomField;
56 private static AddressField endField;
57
58 // Accessors
59 public Address bottom() { return bottomField.getValue(addr); }
60 public Address end() { return endField.getValue(addr); }
61
62 /** Returns a subregion of the space containing all the objects in
63 the space. */
64 public MemRegion usedRegion() {
65 return new MemRegion(bottom(), end());
66 }
67
68 /** Support for iteration over heap -- not sure how this will
69 interact with GC in reflective system, but necessary for the
70 debugging mechanism */
71 public OopHandle bottomAsOopHandle() {
72 return bottomField.getOopHandle(addr);
73 }
74
75 /** returns all MemRegions where live objects are */
76 public abstract List/*<MemRegion>*/ getLiveRegions();
77
78 /** Returned value is in bytes */
79 public long capacity() { return end().minus(bottom()); }
80
81 public abstract long used();
82
83 /** Testers */
84 public boolean contains(Address p) {
85 return (bottom().lessThanOrEqual(p) && end().greaterThan(p));
86 }
87
88 public void print() { printOn(System.out); }
89 public abstract void printOn(PrintStream tty);
90 }