1 /*
   2  * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
   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.types.CIntegerField;
  35 import sun.jvm.hotspot.types.JLongField;
  36 import sun.jvm.hotspot.types.AddressField;
  37 import sun.jvm.hotspot.memory.SpaceClosure;
  38 import java.io.PrintStream;
  39 import java.util.Iterator;
  40 import java.util.Observable;
  41 import java.util.Observer;
  42 
  43 public class ShenandoahHeap extends CollectedHeap {
  44     static private CIntegerField numRegions;
  45     static private JLongField    usedRegions;
  46     static private CIntegerField committedRegions;
  47     static private AddressField  regionsField;
  48 
  49     static {
  50         VM.registerVMInitializedObserver(new Observer() {
  51             public void update(Observable o, Object data) {
  52                 initialize(VM.getVM().getTypeDataBase());
  53             }
  54         });
  55     }
  56 
  57     static private synchronized void initialize(TypeDataBase db) {
  58         Type type = db.lookupType("ShenandoahHeap");
  59         numRegions = type.getCIntegerField("_num_regions");
  60         usedRegions = type.getJLongField("_used");
  61         committedRegions = type.getCIntegerField("_committed");
  62 
  63         regionsField = type.getAddressField("_regions");
  64     }
  65 
  66     @Override
  67     public CollectedHeapName kind() {
  68         return CollectedHeapName.SHENANDOAH_HEAP;
  69     }
  70 
  71     public long numOfRegions() {
  72         return numRegions.getValue(addr);
  73     }
  74 
  75     public long used() {
  76         return usedRegions.getValue(addr);
  77     }
  78 
  79     public long committed() {
  80         return committedRegions.getValue(addr);
  81     }
  82     public void heapRegionIterate(SpaceClosure scl) {
  83         ShenandoahHeapRegionSet regionSet = regions();
  84         for (long index = 0; index < regionSet.activeRegions(); index ++) {
  85             ShenandoahHeapRegion r = regionSet.getRegion(index);
  86 
  87             // Walk live regions
  88             if (!r.isTrash() && !r.isUncommitted() && !r.isEmpty()) {
  89                 scl.doSpace(r);
  90             }
  91         }
  92     }
  93 
  94     public int oop_extra_words() {
  95         return 1;
  96     }
  97 
  98     public int oop_region_offset_words() {
  99         return 1;
 100     }
 101 
 102     @Override
 103     public void printOn(PrintStream tty) {
 104         MemRegion mr = reservedRegion();
 105         tty.print("Shenandoah heap");
 106         tty.print(" [" + mr.start() + ", " + mr.end() + "]");
 107         tty.println(" region size " + ShenandoahHeapRegion.regionSizeBytes() / 1024 + " K");
 108     }
 109 
 110     private ShenandoahHeapRegionSet regions() {
 111         Address regsAddr = regionsField.getValue(addr);
 112         return (ShenandoahHeapRegionSet) VMObjectFactory.newObject(ShenandoahHeapRegionSet.class,
 113                 regsAddr);
 114     }
 115 
 116     public ShenandoahHeap(Address addr) {
 117         super(addr);
 118     }
 119 }