1 /*
   2  * Copyright (c) 2011, 2015, 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.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 HeapRegionManager.
  41 
  42 public class HeapRegionManager extends VMObject {
  43     // G1HeapRegionTable _regions
  44     static private long regionsFieldOffset;
  45     // uint _committed_length
  46     static private CIntegerField numCommittedField;
  47 
  48     static {
  49         VM.registerVMInitializedObserver(new Observer() {
  50                 public void update(Observable o, Object data) {
  51                     initialize(VM.getVM().getTypeDataBase());
  52                 }
  53             });
  54     }
  55 
  56     static private synchronized void initialize(TypeDataBase db) {
  57         Type type = db.lookupType("HeapRegionManager");
  58 
  59         regionsFieldOffset = type.getField("_regions").getOffset();
  60         numCommittedField = type.getCIntegerField("_num_committed");
  61     }
  62 
  63     private G1HeapRegionTable regions() {
  64         Address regionsAddr = addr.addOffsetTo(regionsFieldOffset);
  65         return (G1HeapRegionTable) VMObjectFactory.newObject(G1HeapRegionTable.class,
  66                                                              regionsAddr);
  67     }
  68 
  69     public long capacity() {
  70         return length() * HeapRegion.grainBytes();
  71     }
  72 
  73     public long length() {
  74         return regions().length();
  75     }
  76 
  77     public long committedLength() {
  78         return numCommittedField.getValue(addr);
  79     }
  80 
  81     public Iterator<HeapRegion> heapRegionIterator() {
  82         return regions().heapRegionIterator(length());
  83     }
  84 
  85     public HeapRegionManager(Address addr) {
  86         super(addr);
  87     }
  88 }