/* * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ package sun.jvm.hotspot.gc.shenandoah; import sun.jvm.hotspot.gc.shared.CollectedHeap; import sun.jvm.hotspot.gc.shared.CollectedHeapName; import sun.jvm.hotspot.debugger.Address; import sun.jvm.hotspot.runtime.VM; import sun.jvm.hotspot.types.Type; import sun.jvm.hotspot.types.TypeDataBase; import sun.jvm.hotspot.memory.MemRegion; import sun.jvm.hotspot.types.CIntegerField; import java.io.PrintStream; import java.util.Observable; import java.util.Observer; public class ShenandoahHeap extends CollectedHeap { static private CIntegerField numRegions; static private CIntegerField used; static private CIntegerField committed; static { VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } }); } static private synchronized void initialize(TypeDataBase db) { Type type = db.lookupType("ShenandoahHeap"); numRegions = type.getCIntegerField("_num_regions"); used = type.getCIntegerField("_used"); committed = type.getCIntegerField("_committed"); } @Override public CollectedHeapName kind() { return CollectedHeapName.SHENANDOAH; } public long numOfRegions() { return numRegions.getValue(addr); } @Override public long used() { return used.getValue(addr); } public long committed() { return committed.getValue(addr); } @Override public void printOn(PrintStream tty) { MemRegion mr = reservedRegion(); tty.print("Shenandoah heap"); tty.print(" [" + mr.start() + ", " + mr.end() + "]"); tty.println(" region size " + ShenandoahHeapRegion.regionSizeBytes() / 1024 + " K"); } public ShenandoahHeap(Address addr) { super(addr); } }