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_ZVIRTUALMEMORY_HPP
25#define SHARE_GC_Z_ZVIRTUALMEMORY_HPP
26
27#include "gc/z/zMemory.hpp"
28
29class ZVirtualMemory {
30 friend class VMStructs;
31
32private:
33 uintptr_t _start;
34 uintptr_t _end;
35
36public:
37 ZVirtualMemory();
38 ZVirtualMemory(uintptr_t start, size_t size);
39
40 bool is_null() const;
41 uintptr_t start() const;
42 uintptr_t end() const;
43 size_t size() const;
44
45 ZVirtualMemory split(size_t size);
46};
47
48class ZVirtualMemoryManager {
49private:
50 ZMemoryManager _manager;
51 bool _initialized;
52
53 bool reserve(uintptr_t start, size_t size);
54 void nmt_reserve(uintptr_t start, size_t size);
55
56public:
57 ZVirtualMemoryManager();
58
59 bool is_initialized() const;
60
61 ZVirtualMemory alloc(size_t size, bool alloc_from_front = false);
62 void free(const ZVirtualMemory& vmem);
63};
64
65#endif // SHARE_GC_Z_ZVIRTUALMEMORY_HPP
66