monitorChunk.hpp revision 3465:d2a62e0f25eb 
1/*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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,
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24
25#ifndef SHARE_VM_RUNTIME_MONITORCHUNK_HPP
26#define SHARE_VM_RUNTIME_MONITORCHUNK_HPP
27
28#include "runtime/synchronizer.hpp"
29
30// Data structure for holding monitors for one activation during
31// deoptimization.
32
33class MonitorChunk: public CHeapObj<mtInternal> {
34 private:
35  int              _number_of_monitors;
36  BasicObjectLock* _monitors;
37  BasicObjectLock* monitors() const { return _monitors; }
38  MonitorChunk*    _next;
39 public:
40  // Constructor
41  MonitorChunk(int number_on_monitors);
42  ~MonitorChunk();
43
44  // link operations
45  MonitorChunk* next() const                { return _next; }
46  void set_next(MonitorChunk* next)         { _next = next; }
47
48  // Tells whether the monitor chunk is linked into the JavaThread
49  bool is_linked() const                    { return next() != NULL; }
50
51  // Returns the number of monitors
52  int number_of_monitors() const { return _number_of_monitors; }
53
54  // Returns the index'th monitor
55  BasicObjectLock* at(int index)            { assert(index >= 0 && index < number_of_monitors(), "out of bounds check"); return &monitors()[index]; }
56
57
58  // Memory management
59  void oops_do(OopClosure* f);
60
61  // Tells whether the addr point into the monitors.
62  bool contains(void* addr) const           { return (addr >= (void*) monitors()) && (addr <  (void*) (monitors() + number_of_monitors())); }
63};
64
65#endif // SHARE_VM_RUNTIME_MONITORCHUNK_HPP
66