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1   /*
2    * Copyright (c) 2003, 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  
25  package sun.jvm.hotspot.gc_implementation.parallelScavenge;
26  
27  import java.io.*;
28  import java.util.*;
29  
30  import sun.jvm.hotspot.debugger.*;
31  import sun.jvm.hotspot.gc_implementation.shared.*;
32  import sun.jvm.hotspot.memory.*;
33  import sun.jvm.hotspot.runtime.*;
34  import sun.jvm.hotspot.types.*;
35  
36  public class PSYoungGen extends VMObject {
37     static {
38        VM.registerVMInitializedObserver(new Observer() {
39           public void update(Observable o, Object data) {
40              initialize(VM.getVM().getTypeDataBase());
41           }
42        });
43     }
44  
45     private static synchronized void initialize(TypeDataBase db) {
46        Type type = db.lookupType("PSYoungGen");
47        edenSpaceField = type.getAddressField("_eden_space");
48        fromSpaceField = type.getAddressField("_from_space");
49        toSpaceField = type.getAddressField("_to_space");
50     }
51  
52     public PSYoungGen(Address addr) {
53        super(addr);
54     }
55  
56     // Fields
57     private static AddressField edenSpaceField;
58     private static AddressField fromSpaceField;
59     private static AddressField toSpaceField;
60  
61     // Accessors
62     public MutableSpace edenSpace() {
63        return (MutableSpace) VMObjectFactory.newObject(MutableSpace.class, edenSpaceField.getValue(addr));
64     }
65  
66     public MutableSpace fromSpace() {
67        return (MutableSpace) VMObjectFactory.newObject(MutableSpace.class, fromSpaceField.getValue(addr));
68     }
69  
70     public MutableSpace toSpace() {
71        return (MutableSpace) VMObjectFactory.newObject(MutableSpace.class, toSpaceField.getValue(addr));
72     }
73  
74     public long capacity() {
75        return edenSpace().capacity() + fromSpace().capacity();
76     }
77  
78     public long used() {
79        return edenSpace().used() + fromSpace().used();
80     }
81  
82     public boolean isIn(Address a) {
83        if (edenSpace().contains(a)) {
84           return true;
85        }
86  
87        if (fromSpace().contains(a)) {
88           return true;
89        }
90        return false;
91     }
92  
93     public void printOn(PrintStream tty) {
94        tty.print("PSYoungGen [ ");
95        tty.print("eden = ");
96        edenSpace().printOn(tty);
97        tty.print(", from = ");
98        fromSpace().printOn(tty);
99        tty.print(", to = ");
100       toSpace().printOn(tty);
101       tty.print(" ] ");
102    }
103 }