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1   /*
2    * Copyright (c) 2000, 2005, 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
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23   */
24  
25  package sun.jvm.hotspot.gc_interface;
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 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 CollectedHeapName kind() {
77      return CollectedHeapName.ABSTRACT;
78    }
79  
80    public void print() { printOn(System.out); }
81    public void printOn(PrintStream tty) {
82      MemRegion mr = reservedRegion();
83      tty.println("unknown subtype of CollectedHeap @ " + getAddress() + " (" +
84                  mr.start() + "," + mr.end() + ")");
85    }
86  }