1/*
2 * Copyright (c) 1997, 2019, 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.
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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 *
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24
25#ifndef SHARE_RUNTIME_MONITORCHUNK_HPP
26#define SHARE_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<mtSynchronizer> {
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_RUNTIME_MONITORCHUNK_HPP
66