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.runtime;
  26 
  27 import java.util.*;
  28 import sun.jvm.hotspot.debugger.*;
  29 import sun.jvm.hotspot.types.*;
  30 
  31 public class VirtualSpace extends VMObject {
  32   private static AddressField lowField;
  33   private static AddressField highField;
  34   private static AddressField lowBoundaryField;
  35   private static AddressField highBoundaryField;
  36 
  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("VirtualSpace");
  47 
  48     lowField          = type.getAddressField("_low");
  49     highField         = type.getAddressField("_high");
  50     lowBoundaryField  = type.getAddressField("_low_boundary");
  51     highBoundaryField = type.getAddressField("_high_boundary");
  52   }
  53 
  54   public VirtualSpace(Address addr) {
  55     super(addr);
  56   }
  57 
  58   public Address low()                          { return lowField.getValue(addr);          }
  59   public Address high()                         { return highField.getValue(addr);         }
  60   public Address lowBoundary()                  { return lowBoundaryField.getValue(addr);  }
  61   public Address highBoundary()                 { return highBoundaryField.getValue(addr); }
  62 
  63   /** Testers (all sizes are byte sizes) */
  64   public long committedSize()                   { return high().minus(low());                                    }
  65   public long reservedSize()                    { return highBoundary().minus(lowBoundary());                    }
  66   public long uncommittedSize()                 { return reservedSize() - committedSize();                       }
  67   public boolean contains(Address addr)         { return (low().lessThanOrEqual(addr) && addr.lessThan(high())); }
  68 }