1/*
2 * Copyright (c) 2000, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25package sun.jvm.hotspot.gc.shared;
26
27import java.io.*;
28import java.util.*;
29
30import sun.jvm.hotspot.debugger.*;
31import sun.jvm.hotspot.memory.*;
32import sun.jvm.hotspot.runtime.*;
33import sun.jvm.hotspot.types.*;
34
35public class ContiguousSpace extends CompactibleSpace {
36  private static AddressField topField;
37
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) {
47    Type type = db.lookupType("ContiguousSpace");
48
49    topField = type.getAddressField("_top");
50  }
51
52  public ContiguousSpace(Address addr) {
53    super(addr);
54  }
55
56  public Address top() {
57    return topField.getValue(addr);
58  }
59
60  /** In bytes */
61  public long capacity() {
62    return end().minus(bottom());
63  }
64
65  /** In bytes */
66  public long used() {
67    return top().minus(bottom());
68  }
69
70  /** In bytes */
71  public long free() {
72    return end().minus(top());
73  }
74
75  /** In a contiguous space we have a more obvious bound on what parts
76      contain objects. */
77  public MemRegion usedRegion() {
78    return new MemRegion(bottom(), top());
79  }
80
81  /** Returns regions of Space where live objects live */
82  public List/*<MemRegion>*/ getLiveRegions() {
83    List res = new ArrayList();
84    res.add(new MemRegion(bottom(), top()));
85    return res;
86  }
87
88  /** Testers */
89  public boolean contains(Address p) {
90    return (bottom().lessThanOrEqual(p) && top().greaterThan(p));
91  }
92
93  public void printOn(PrintStream tty) {
94    tty.print(" [" + bottom() + "," +
95                top() + "," + end() + ")");
96    super.printOn(tty);
97  }
98}
99