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.types.Type; 31 import sun.jvm.hotspot.types.TypeDataBase; 32 import sun.jvm.hotspot.memory.MemRegion; 33 import sun.jvm.hotspot.types.CIntegerField; 34 import java.io.PrintStream; 35 import java.util.Observable; 36 import java.util.Observer; 37 38 public class ShenandoahHeap extends CollectedHeap { 39 static private CIntegerField numRegions; 40 static private CIntegerField used; 41 static private CIntegerField committed; 42 static { 43 VM.registerVMInitializedObserver(new Observer() { 44 public void update(Observable o, Object data) { 45 initialize(VM.getVM().getTypeDataBase()); 46 } 47 }); 48 } 49 50 static private synchronized void initialize(TypeDataBase db) { 51 Type type = db.lookupType("ShenandoahHeap"); 52 numRegions = type.getCIntegerField("_num_regions"); 53 used = type.getCIntegerField("_used"); 54 committed = type.getCIntegerField("_committed"); 55 } 56 57 @Override 58 public CollectedHeapName kind() { 59 return CollectedHeapName.SHENANDOAH; 60 } 61 62 public long numOfRegions() { 63 return numRegions.getValue(addr); 64 } 65 66 @Override 67 public long used() { 68 return used.getValue(addr); 69 } 70 71 public long committed() { 72 return committed.getValue(addr); 73 } 74 75 @Override 76 public void printOn(PrintStream tty) { 77 MemRegion mr = reservedRegion(); 78 tty.print("Shenandoah heap"); 79 tty.print(" [" + mr.start() + ", " + mr.end() + "]"); 80 tty.println(" region size " + ShenandoahHeapRegion.regionSizeBytes() / 1024 + " K"); 81 } 82 83 public ShenandoahHeap(Address addr) { 84 super(addr); 85 } 86 }