1 /*

     2  * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.

     3  *

     4  * This code is free software; you can redistribute it and/or modify it

     5  * under the terms of the GNU General Public License version 2 only, as

     6  * published by the Free Software Foundation.

     7  *

     8  * This code is distributed in the hope that it will be useful, but WITHOUT

     9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    11  * version 2 for more details (a copy is included in the LICENSE file that

    12  * accompanied this code).

    13  *

    14  * You should have received a copy of the GNU General Public License version

    15  * 2 along with this work; if not, write to the Free Software Foundation,

    16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    17  *

    18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    19  * or visit www.oracle.com if you need additional information or have any

    20  * questions.

    21  *

    22  */

    23 

    24 package sun.jvm.hotspot.gc.shenandoah;

    25 

    26 import sun.jvm.hotspot.gc.shared.ContiguousSpace;

    27 import sun.jvm.hotspot.types.CIntegerField;

    28 import sun.jvm.hotspot.runtime.VM;

    29 import sun.jvm.hotspot.types.Type;

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

    31 import sun.jvm.hotspot.debugger.Address;

    32 

    33 import java.util.Observable;

    34 import java.util.Observer;

    35 

    36 

    37 public class ShenandoahHeapRegion extends ContiguousSpace {

    38     private static CIntegerField RegionSizeBytes;

    39     static {

    40         VM.registerVMInitializedObserver(new Observer() {

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

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

    43             }

    44         });

    45     }

    46 

    47     static private synchronized void initialize(TypeDataBase db) {

    48         Type type = db.lookupType("ShenandoahHeapRegion");

    49         RegionSizeBytes = type.getCIntegerField("RegionSizeBytes");

    50     }

    51 

    52     public static long regionSizeBytes() { return RegionSizeBytes.getValue(); }

    53 

    54     public ShenandoahHeapRegion(Address addr) {

    55         super(addr);

    56     }

    57 }