1 /*

     2  * Copyright (c) 2000, 2004, 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.compiler;

    26 

    27 import java.util.*;

    28 

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

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

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

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

    33 

    34 public class ImmutableOopMap extends VMObject {

    35   private static CIntegerField countField;

    36   private static long classSize;

    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 void initialize(TypeDataBase db) {

    47     Type type = db.lookupType("ImmutableOopMap");

    48     countField = type.getCIntegerField("_count");

    49     classSize = type.getSize();

    50   }

    51 

    52   public ImmutableOopMap(Address addr) {

    53     super(addr);

    54   }

    55 

    56   //--------------------------------------------------------------------------------

    57   // Internals only below this point

    58   //

    59 

    60   long getCount() {

    61     return countField.getValue(addr);

    62   }

    63 

    64   public Address getData() {

    65     return addr.addOffsetTo(classSize);

    66   }

    67 }