1/*
2 * Copyright (c) 2015, 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.
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_ZMEMORY_HPP
25#define SHARE_GC_Z_ZMEMORY_HPP
26
27#include "gc/z/zList.hpp"
28#include "memory/allocation.hpp"
29
30class ZMemory : public CHeapObj<mtGC> {
31 friend class ZList<ZMemory>;
32
33private:
34 uintptr_t _start;
35 uintptr_t _end;
36 ZListNode<ZMemory> _node;
37
38public:
39 ZMemory(uintptr_t start, size_t size);
40
41 uintptr_t start() const;
42 uintptr_t end() const;
43 size_t size() const;
44
45 void shrink_from_front(size_t size);
46 void shrink_from_back(size_t size);
47 void grow_from_front(size_t size);
48 void grow_from_back(size_t size);
49};
50
51class ZMemoryManager {
52private:
53 ZList<ZMemory> _freelist;
54
55public:
56 uintptr_t alloc_from_front(size_t size);
57 uintptr_t alloc_from_front_at_most(size_t size, size_t* allocated);
58 uintptr_t alloc_from_back(size_t size);
59 uintptr_t alloc_from_back_at_most(size_t size, size_t* allocated);
60 void free(uintptr_t start, size_t size);
61};
62
63#endif // SHARE_GC_Z_ZMEMORY_HPP
64