/*

 * Copyright 1997-2000 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

// Data structure for holding monitors for one activation during

// deoptimization.

class MonitorChunk: public CHeapObj {

 private:

  int              _number_of_monitors;

  BasicObjectLock* _monitors;

  BasicObjectLock* monitors() const { return _monitors; }

  MonitorChunk*    _next;

 public:

  // Constructor

  MonitorChunk(int number_on_monitors);

  ~MonitorChunk();

  // link operations

  MonitorChunk* next() const                { return _next; }

  void set_next(MonitorChunk* next)         { _next = next; }

  // Tells whether the monitor chunk is linked into the JavaThread

  bool is_linked() const                    { return next() != NULL; }

  // Returns the number of monitors

  int number_of_monitors() const { return _number_of_monitors; }

  // Returns the index'th monitor

  BasicObjectLock* at(int index)            { assert(index >= 0 && index < number_of_monitors(), "out of bounds check"); return &monitors()[index]; }

  // Memory management

  void oops_do(OopClosure* f);

  // Tells whether the addr point into the monitors.

  bool contains(void* addr) const           { return (addr >= (void*) monitors()) && (addr <  (void*) (monitors() + number_of_monitors())); }

};