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.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.types.CIntegerField;
  35 import sun.jvm.hotspot.types.AddressField;
  36 import sun.jvm.hotspot.gc.shared.SpaceClosure;
  37 import java.io.PrintStream;
  38 import java.util.Iterator;
  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 CIntegerField usedRegions;
  45     static private CIntegerField committedRegions;
  46     static private AddressField  regionsField;
  47     static {
  48         VM.registerVMInitializedObserver(new Observer() {
  49             public void update(Observable o, Object data) {
  50                 initialize(VM.getVM().getTypeDataBase());
  51             }
  52         });
  53     }
  54 
  55     static private synchronized void initialize(TypeDataBase db) {
  56         Type type = db.lookupType("ShenandoahHeap");
  57         numRegions = type.getCIntegerField("_num_regions");
  58         usedRegions = type.getCIntegerField("_used");
  59         committedRegions = type.getCIntegerField("_committed");
  60 
  61         regionsField = type.getAddressField("_regions");
  62     }
  63 
  64     @Override
  65     public CollectedHeapName kind() {
  66         return CollectedHeapName.SHENANDOAH;
  67     }
  68 
  69     public long numOfRegions() {
  70         return numRegions.getValue(addr);
  71     }
  72 
  73     public long used() {
  74         return usedRegions.getValue(addr);
  75     }
  76 
  77     public long committed() {
  78         return committedRegions.getValue(addr);
  79     }
  80 
  81     public void heapRegionIterate(sun.jvm.hotspot.gc.shared.SpaceClosure scl) {
  82         int numRgns = (int)numRegions.getValue(addr);
  83         for (int index = 0; index < numRgns; index ++) {
  84             ShenandoahHeapRegion r = getRegion(index);
  85 
  86             // Walk live regions
  87             if (!r.isTrash() && !r.isUncommitted() && !r.isEmpty()) {
  88                 scl.doSpace(r);
  89             }
  90         }
  91     }
  92 
  93     @Override
  94     public int cell_header_size() {
  95         return VM.getVM().getHeapWordSize();
  96     }
  97 
  98     @Override
  99     public void printOn(PrintStream tty) {
 100         MemRegion mr = reservedRegion();
 101         tty.print("Shenandoah heap");
 102         tty.print(" [" + mr.start() + ", " + mr.end() + "]");
 103         tty.println(" region size " + ShenandoahHeapRegion.regionSizeBytes() / 1024 + " K");
 104     }
 105 
 106     private ShenandoahHeapRegion getRegion(int index) {
 107         Address regsAddr = regionsField.getValue(addr);
 108         return (ShenandoahHeapRegion) VMObjectFactory.newObject(ShenandoahHeapRegion.class,
 109                 regsAddr.getAddressAt(index * VM.getVM().getAddressSize()));
 110     }
 111 
 112     public ShenandoahHeap(Address addr) {
 113         super(addr);
 114     }
 115 }