1 /*
   2  * Copyright (c) 2017, 2019, 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_implementation.shenandoah;
  25 
  26 import sun.jvm.hotspot.gc_interface.CollectedHeap;
  27 import sun.jvm.hotspot.gc_interface.CollectedHeapName;
  28 import sun.jvm.hotspot.debugger.Address;
  29 import sun.jvm.hotspot.runtime.VM;
  30 import sun.jvm.hotspot.runtime.VMObjectFactory;
  31 import sun.jvm.hotspot.types.Type;
  32 import sun.jvm.hotspot.types.TypeDataBase;
  33 import sun.jvm.hotspot.memory.MemRegion;
  34 import sun.jvm.hotspot.memory.SpaceClosure;
  35 import sun.jvm.hotspot.types.AddressField;
  36 import sun.jvm.hotspot.types.CIntegerField;
  37 import sun.jvm.hotspot.types.JLongField;
  38 import java.io.PrintStream;
  39 import java.util.Observable;
  40 import java.util.Observer;
  41 
  42 public class ShenandoahHeap extends CollectedHeap {
  43     static private CIntegerField numRegions;
  44     static private JLongField    used;
  45     static private CIntegerField committed;
  46     static private AddressField  regions;
  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("ShenandoahHeap");
  58         numRegions = type.getCIntegerField("_num_regions");
  59         used = type.getJLongField("_used");
  60         committed = type.getCIntegerField("_committed");
  61         regions = type.getAddressField("_regions");
  62     }
  63 
  64     @Override
  65     public CollectedHeapName kind() {
  66         return CollectedHeapName.SHENANDOAH_HEAP;
  67     }
  68 
  69     public long numOfRegions() {
  70         return numRegions.getValue(addr);
  71     }
  72 
  73     @Override
  74     public long used() {
  75         return used.getValue(addr);
  76     }
  77 
  78     public long committed() {
  79         return committed.getValue(addr);
  80     }
  81 
  82     @Override
  83     public void printOn(PrintStream tty) {
  84         MemRegion mr = reservedRegion();
  85         tty.print("Shenandoah heap");
  86         tty.print(" [" + mr.start() + ", " + mr.end() + "]");
  87         tty.println(" region size " + ShenandoahHeapRegion.regionSizeBytes() / 1024 + " K");
  88     }
  89 
  90     public ShenandoahHeap(Address addr) {
  91         super(addr);
  92     }
  93 
  94     public void iterateHeapRegions(SpaceClosure scl) {
  95         for (long index = 0; index < numOfRegions(); index ++) {
  96             ShenandoahHeapRegion region = at(index);
  97             scl.doSpace(region);
  98         }
  99     }
 100 
 101     private ShenandoahHeapRegion at(long index) {
 102         Address arrayAddr = regions.getValue(addr);
 103         // Offset of &_regions[index]
 104         long offset = index * VM.getVM().getAddressSize();
 105         Address regionAddr = arrayAddr.getAddressAt(offset);
 106         return (ShenandoahHeapRegion) VMObjectFactory.newObject(ShenandoahHeapRegion.class,
 107                 regionAddr);
 108     }
 109 }