1 /*

     2  * Copyright (c) 2000, 2002, 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.util.*;

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

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

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

    31 

    32 public class VirtualSpace extends VMObject {

    33   private static AddressField lowField;

    34   private static AddressField highField;

    35   private static AddressField lowBoundaryField;

    36   private static AddressField highBoundaryField;

    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("VirtualSpace");

    48 

    49     lowField          = type.getAddressField("_low");

    50     highField         = type.getAddressField("_high");

    51     lowBoundaryField  = type.getAddressField("_low_boundary");

    52     highBoundaryField = type.getAddressField("_high_boundary");

    53   }

    54 

    55   public VirtualSpace(Address addr) {

    56     super(addr);

    57   }

    58 

    59   public Address low()                          { return lowField.getValue(addr);          }

    60   public Address high()                         { return highField.getValue(addr);         }

    61   public Address lowBoundary()                  { return lowBoundaryField.getValue(addr);  }

    62   public Address highBoundary()                 { return highBoundaryField.getValue(addr); }

    63 

    64   /** Testers (all sizes are byte sizes) */

    65   public long committedSize()                   { return high().minus(low());                                    }

    66   public long reservedSize()                    { return highBoundary().minus(lowBoundary());                    }

    67   public long uncommittedSize()                 { return reservedSize() - committedSize();                       }

    68   public boolean contains(Address addr)         { return (low().lessThanOrEqual(addr) && addr.lessThan(high())); }

    69 }