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 }