1/*
2 * Copyright (c) 2015, 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_ZOBJECTALLOCATOR_HPP
25#define SHARE_GC_Z_ZOBJECTALLOCATOR_HPP
26
27#include "gc/z/zAllocationFlags.hpp"
28#include "gc/z/zPage.hpp"
29#include "gc/z/zValue.hpp"
30#include "memory/allocation.hpp"
31
32class ZObjectAllocator {
33private:
34 const uint _nworkers;
35 ZPerCPU<size_t> _used;
36 ZContended<ZPage*> _shared_medium_page;
37 ZPerCPU<ZPage*> _shared_small_page;
38 ZPerWorker<ZPage*> _worker_small_page;
39
40 ZPage* alloc_page(uint8_t type, size_t size, ZAllocationFlags flags);
41
42 // Allocate an object in a shared page. Allocate and
43 // atomically install a new page if necessary.
44 uintptr_t alloc_object_in_shared_page(ZPage** shared_page,
45 uint8_t page_type,
46 size_t page_size,
47 size_t size,
48 ZAllocationFlags flags);
49
50 uintptr_t alloc_large_object(size_t size, ZAllocationFlags flags);
51 uintptr_t alloc_medium_object(size_t size, ZAllocationFlags flags);
52 uintptr_t alloc_small_object_from_nonworker(size_t size, ZAllocationFlags flags);
53 uintptr_t alloc_small_object_from_worker(size_t size, ZAllocationFlags flags);
54 uintptr_t alloc_small_object(size_t size, ZAllocationFlags flags);
55 uintptr_t alloc_object(size_t size, ZAllocationFlags flags);
56
57 bool undo_alloc_large_object(ZPage* page);
58 bool undo_alloc_medium_object(ZPage* page, uintptr_t addr, size_t size);
59 bool undo_alloc_small_object_from_nonworker(ZPage* page, uintptr_t addr, size_t size);
60 bool undo_alloc_small_object_from_worker(ZPage* page, uintptr_t addr, size_t size);
61 bool undo_alloc_small_object(ZPage* page, uintptr_t addr, size_t size);
62 bool undo_alloc_object(ZPage* page, uintptr_t addr, size_t size);
63
64public:
65 ZObjectAllocator(uint nworkers);
66
67 uintptr_t alloc_object(size_t size);
68
69 uintptr_t alloc_object_for_relocation(size_t size);
70 void undo_alloc_object_for_relocation(ZPage* page, uintptr_t addr, size_t size);
71
72 size_t used() const;
73 size_t remaining() const;
74
75 void retire_pages();
76};
77
78#endif // SHARE_GC_Z_ZOBJECTALLOCATOR_HPP
79