/*

 * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * 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.runtime;

import java.util.*;

import sun.jvm.hotspot.debugger.*;

import sun.jvm.hotspot.types.*;

public class BasicObjectLock extends VMObject {

  static {

    VM.registerVMInitializedObserver(new Observer() {

        public void update(Observable o, Object data) {

          initialize(VM.getVM().getTypeDataBase());

        }

      });

  }

  private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {

    Type type  = db.lookupType("BasicObjectLock");

    lockField  = type.getField("_lock");

    objField   = type.getOopField("_obj");

    size       = (int) type.getSize();

  }

  private static sun.jvm.hotspot.types.Field    lockField;

  private static sun.jvm.hotspot.types.OopField objField;

  private static int        size;

  public BasicObjectLock(Address addr) {

    super(addr);

  }

  public OopHandle obj()  { return objField.getValue(addr); }

  public BasicLock lock() { return new BasicLock(addr.addOffsetTo(lockField.getOffset())); }

  /** Note: Use frame::interpreter_frame_monitor_size() for the size

      of BasicObjectLocks in interpreter activation frames since it

      includes machine-specific padding. This routine returns a size

      in BYTES in this system! */

  public static int size() { return size; }

  /** Helper routine for Frames (also probably needed for iteration) */

  public Address address() { return addr; }

}