monitorChunk.hpp revision 0:a61af66fc99e 
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
28class 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};
59