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_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.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 sun.jvm.hotspot.types.JLongField; 35 import java.io.PrintStream; 36 import java.util.Observable; 37 import java.util.Observer; 38 39 public class ShenandoahHeap extends CollectedHeap { 40 static private CIntegerField numRegions; 41 static private JLongField used; 42 static private CIntegerField committed; 43 static { 44 VM.registerVMInitializedObserver(new Observer() { 45 public void update(Observable o, Object data) { 46 initialize(VM.getVM().getTypeDataBase()); 47 } 48 }); 49 } 50 51 static private synchronized void initialize(TypeDataBase db) { 52 Type type = db.lookupType("ShenandoahHeap"); 53 numRegions = type.getCIntegerField("_num_regions"); 54 used = type.getJLongField("_used"); 55 committed = type.getCIntegerField("_committed"); 56 } 57 58 @Override 59 public CollectedHeapName kind() { 60 return CollectedHeapName.SHENANDOAH_HEAP; 61 } 62 63 public long numOfRegions() { 64 return numRegions.getValue(addr); 65 } 66 67 @Override 68 public long used() { 69 return used.getValue(addr); 70 } 71 72 public long committed() { 73 return committed.getValue(addr); 74 } 75 76 @Override 77 public void printOn(PrintStream tty) { 78 MemRegion mr = reservedRegion(); 79 tty.print("Shenandoah heap"); 80 tty.print(" [" + mr.start() + ", " + mr.end() + "]"); 81 tty.println(" region size " + ShenandoahHeapRegion.regionSizeBytes() / 1024 + " K"); 82 } 83 84 public ShenandoahHeap(Address addr) { 85 super(addr); 86 } 87 }