/*

 * 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);

    }

}