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 }