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 abstract class CollectedHeap extends VMObject {
36  private static long         reservedFieldOffset;
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("CollectedHeap");
48
49    reservedFieldOffset = type.getField("_reserved").getOffset();
50  }
51
52  public CollectedHeap(Address addr) {
53    super(addr);
54  }
55
56  /** Returns the lowest address of the heap. */
57  public Address start() {
58    return reservedRegion().start();
59  }
60
61  public long capacity() { return 0; }
62  public long used()     { return 0; }
63
64  public MemRegion reservedRegion() {
65    return new MemRegion(addr.addOffsetTo(reservedFieldOffset));
66  }
67
68  public boolean isIn(Address a) {
69    return isInReserved(a);
70  }
71
72  public boolean isInReserved(Address a) {
73    return reservedRegion().contains(a);
74  }
75
76  public abstract CollectedHeapName kind();
77
78  public void print() { printOn(System.out); }
79  public void printOn(PrintStream tty) {
80    MemRegion mr = reservedRegion();
81    tty.println("unknown subtype of CollectedHeap @ " + getAddress() + " (" +
82                mr.start() + "," + mr.end() + ")");
83  }
84}
85