1/*
2 * Copyright (c) 2016, 2018, 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,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24#ifndef SHARE_GC_Z_ZMARKSTACKALLOCATOR_HPP
25#define SHARE_GC_Z_ZMARKSTACKALLOCATOR_HPP
26
27#include "gc/z/zGlobals.hpp"
28#include "gc/z/zLock.hpp"
29#include "utilities/globalDefinitions.hpp"
30
31class ZMarkStackSpace {
32private:
33 ZLock _expand_lock;
34 uintptr_t _start;
35 volatile uintptr_t _top;
36 volatile uintptr_t _end;
37
38 void expand();
39
40 uintptr_t alloc_space(size_t size);
41 uintptr_t expand_and_alloc_space(size_t size);
42
43public:
44 ZMarkStackSpace();
45
46 bool is_initialized() const;
47
48 uintptr_t alloc(size_t size);
49};
50
51class ZMarkStackAllocator {
52private:
53 ZMarkStackMagazineList _freelist ATTRIBUTE_ALIGNED(ZCacheLineSize);
54 ZMarkStackSpace _space ATTRIBUTE_ALIGNED(ZCacheLineSize);
55
56 void prime_freelist();
57 ZMarkStackMagazine* create_magazine_from_space(uintptr_t addr, size_t size);
58
59public:
60 ZMarkStackAllocator();
61
62 bool is_initialized() const;
63
64 ZMarkStackMagazine* alloc_magazine();
65 void free_magazine(ZMarkStackMagazine* magazine);
66};
67
68#endif // SHARE_GC_Z_ZMARKSTACKALLOCATOR_HPP
69