1 /*
   2  * Copyright (c) 2012, 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.gc_implementation.g1;
  26 
  27 import java.util.Iterator;
  28 import java.util.Observable;
  29 import java.util.Observer;
  30 
  31 import sun.jvm.hotspot.debugger.Address;
  32 import sun.jvm.hotspot.runtime.VM;
  33 import sun.jvm.hotspot.runtime.VMObject;
  34 import sun.jvm.hotspot.runtime.VMObjectFactory;
  35 import sun.jvm.hotspot.types.AddressField;
  36 import sun.jvm.hotspot.types.CIntegerField;
  37 import sun.jvm.hotspot.types.Type;
  38 import sun.jvm.hotspot.types.TypeDataBase;
  39 
  40 // Mirror class for HeapRegionSetBase. Represents a group of regions.
  41 
  42 public class HeapRegionSetBase extends VMObject {
  43 
  44     static private long countField;
  45 
  46     static {
  47         VM.registerVMInitializedObserver(new Observer() {
  48                 public void update(Observable o, Object data) {
  49                     initialize(VM.getVM().getTypeDataBase());
  50                 }
  51             });
  52     }
  53 
  54     static private synchronized void initialize(TypeDataBase db) {
  55         Type type = db.lookupType("HeapRegionSetBase");
  56 
  57         countField = type.getField("_count").getOffset();
  58     }
  59 
  60 
  61     public HeapRegionSetCount count() {
  62         Address countFieldAddr = addr.addOffsetTo(countField);
  63         return (HeapRegionSetCount) VMObjectFactory.newObject(HeapRegionSetCount.class,
  64                                                                       countFieldAddr);
  65     }
  66     
  67     public HeapRegionSetBase(Address addr) {
  68         super(addr);
  69     }
  70 }