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     // uint _length;
  44     static private CIntegerField lengthField;
  45     // uint _region_num;
  46     static private CIntegerField regionNumField;
  47     // size_t _total_used_bytes;
  48     static private CIntegerField totalUsedBytesField;
  49 
  50     static {
  51         VM.registerVMInitializedObserver(new Observer() {
  52                 public void update(Observable o, Object data) {
  53                     initialize(VM.getVM().getTypeDataBase());
  54                 }
  55             });
  56     }
  57 
  58     static private synchronized void initialize(TypeDataBase db) {
  59         Type type = db.lookupType("HeapRegionSetBase");
  60 
  61         lengthField         = type.getCIntegerField("_length");
  62         regionNumField      = type.getCIntegerField("_region_num");
  63         totalUsedBytesField = type.getCIntegerField("_total_used_bytes");
  64     }
  65 
  66     public long length() {
  67         return lengthField.getValue(addr);
  68     }
  69 
  70     public long regionNum() {
  71         return regionNumField.getValue(addr);
  72     }
  73 
  74     public long totalUsedBytes() {
  75         return totalUsedBytesField.getValue(addr);
  76     }
  77 
  78     public HeapRegionSetBase(Address addr) {
  79         super(addr);
  80     }
  81 }