1 /*

     2  * Copyright (c) 2000, 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.memory;

    26 

    27 import java.io.*;

    28 import java.util.*;

    29 

    30 import sun.jvm.hotspot.debugger.*;

    31 import sun.jvm.hotspot.runtime.*;

    32 import sun.jvm.hotspot.types.*;

    33 

    34 /** <P> OneSpaceOldGeneration models a heap of old objects contained

    35     in a single contiguous space. </P>

    36 

    37     <P> Garbage collection is performed using mark-compact. </P> */

    38 

    39 public abstract class OneContigSpaceCardGeneration extends CardGeneration {

    40   private static AddressField theSpaceField;

    41 

    42   static {

    43     VM.registerVMInitializedObserver(new Observer() {

    44         public void update(Observable o, Object data) {

    45           initialize(VM.getVM().getTypeDataBase());

    46         }

    47       });

    48   }

    49 

    50   private static synchronized void initialize(TypeDataBase db) {

    51     Type type = db.lookupType("OneContigSpaceCardGeneration");

    52 

    53     theSpaceField = type.getAddressField("_the_space");

    54   }

    55 

    56   public OneContigSpaceCardGeneration(Address addr) {

    57     super(addr);

    58   }

    59 

    60   public ContiguousSpace theSpace() {

    61     return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, theSpaceField.getValue(addr));

    62   }

    63 

    64   public boolean isIn(Address p) {

    65     return theSpace().contains(p);

    66   }

    67 

    68   /** Space queries */

    69   public long capacity()            { return theSpace().capacity();                                }

    70   public long used()                { return theSpace().used();                                    }

    71   public long free()                { return theSpace().free();                                    }

    72   public long contiguousAvailable() { return theSpace().free() + virtualSpace().uncommittedSize(); }

    73 

    74   public void spaceIterate(SpaceClosure blk, boolean usedOnly) {

    75     blk.doSpace(theSpace());

    76   }

    77 

    78   public void printOn(PrintStream tty) {

    79     tty.print("  old ");

    80     theSpace().printOn(tty);

    81   }

    82 }