1/*
2 * Copyright (c) 2003, 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.parallel;
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 MutableSpace extends ImmutableSpace {
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("MutableSpace");
46      topField    = type.getAddressField("_top");
47   }
48
49   public MutableSpace(Address addr) {
50      super(addr);
51   }
52
53   // Fields
54   private static AddressField topField;
55
56   // Accessors
57   public Address   top()          { return topField.getValue(addr);    }
58
59   /** In bytes */
60   public long used() {
61      return top().minus(bottom());
62   }
63
64   /** returns all MemRegions where live objects are */
65   public List/*<MemRegion>*/ getLiveRegions() {
66      List res = new ArrayList();
67      res.add(new MemRegion(bottom(), top()));
68      return res;
69   }
70
71   public void printOn(PrintStream tty) {
72      tty.print(" [" + bottom() + "," +
73                top() + "," + end() + "] ");
74   }
75}
76