1 /*

     2  * Copyright 1997-2000 Sun Microsystems, Inc.  All Rights Reserved.

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

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

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

    21  * have any questions.

    22  *

    23  */

    24 

    25 // Data structure for holding monitors for one activation during

    26 // deoptimization.

    27 

    28 class MonitorChunk: public CHeapObj {

    29  private:

    30   int              _number_of_monitors;

    31   BasicObjectLock* _monitors;

    32   BasicObjectLock* monitors() const { return _monitors; }

    33   MonitorChunk*    _next;

    34  public:

    35   // Constructor

    36   MonitorChunk(int number_on_monitors);

    37   ~MonitorChunk();

    38 

    39   // link operations

    40   MonitorChunk* next() const                { return _next; }

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

    42 

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

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

    45 

    46   // Returns the number of monitors

    47   int number_of_monitors() const { return _number_of_monitors; }

    48 

    49   // Returns the index'th monitor

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

    51 

    52 

    53   // Memory management

    54   void oops_do(OopClosure* f);

    55 

    56   // Tells whether the addr point into the monitors.

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

    58 };