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 }