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.CollectedHeap;
  27 import sun.jvm.hotspot.gc.shared.CollectedHeapName;
  28 import sun.jvm.hotspot.debugger.Address;
  29 import sun.jvm.hotspot.runtime.VM;
  30 import sun.jvm.hotspot.types.Type;
  31 import sun.jvm.hotspot.types.TypeDataBase;
  32 import sun.jvm.hotspot.memory.MemRegion;
  33 import sun.jvm.hotspot.types.CIntegerField;
  34 import java.io.PrintStream;
  35 import java.util.Observable;
  36 import java.util.Observer;
  37 
  38 public class ShenandoahHeap extends CollectedHeap {
  39     static private CIntegerField numRegions;
  40     static private CIntegerField used;
  41     static private CIntegerField committed;
  42     static {
  43         VM.registerVMInitializedObserver(new Observer() {
  44             public void update(Observable o, Object data) {
  45                 initialize(VM.getVM().getTypeDataBase());
  46             }
  47         });
  48     }
  49 
  50     static private synchronized void initialize(TypeDataBase db) {
  51         Type type = db.lookupType("ShenandoahHeap");
  52         numRegions = type.getCIntegerField("_num_regions");
  53         used = type.getCIntegerField("_used");
  54         committed = type.getCIntegerField("_committed");
  55     }
  56 
  57     @Override
  58     public CollectedHeapName kind() {
  59         return CollectedHeapName.SHENANDOAH;
  60     }
  61 
  62     public long numOfRegions() {
  63         return numRegions.getValue(addr);
  64     }
  65 
  66     @Override
  67     public long capacity() {
  68         // FIXME
  69         return 0;
  70     }
  71 
  72     @Override
  73     public long used() {
  74         return used.getValue(addr);
  75     }
  76 
  77     public long committed() {
  78         return committed.getValue(addr);
  79     }
  80 
  81     @Override
  82     public void printOn(PrintStream tty) {
  83         MemRegion mr = reservedRegion();
  84         tty.print("Shenandoah heap");
  85         tty.print(" [" + mr.start() + ", " + mr.end() + "]");
  86         tty.println(" region size " + ShenandoahHeapRegion.regionSizeBytes() / 1024 + " K");
  87     }
  88 
  89     public ShenandoahHeap(Address addr) {
  90         super(addr);
  91     }
  92 }