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 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}
91