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_ZLIVEMAP_HPP
25#define SHARE_GC_Z_ZLIVEMAP_HPP
26
27#include "gc/z/zBitMap.hpp"
28#include "memory/allocation.hpp"
29
30class ObjectClosure;
31
32class ZLiveMap {
33 friend class ZLiveMapTest;
34
35private:
36 static const size_t nsegments = 64;
37
38 volatile uint32_t _seqnum;
39 volatile uint32_t _live_objects;
40 volatile size_t _live_bytes;
41 BitMap::bm_word_t _segment_live_bits;
42 BitMap::bm_word_t _segment_claim_bits;
43 ZBitMap _bitmap;
44 size_t _segment_shift;
45
46 const BitMapView segment_live_bits() const;
47 const BitMapView segment_claim_bits() const;
48
49 BitMapView segment_live_bits();
50 BitMapView segment_claim_bits();
51
52 BitMap::idx_t segment_size() const;
53
54 BitMap::idx_t segment_start(BitMap::idx_t segment) const;
55 BitMap::idx_t segment_end(BitMap::idx_t segment) const;
56
57 bool is_segment_live(BitMap::idx_t segment) const;
58 bool set_segment_live_atomic(BitMap::idx_t segment);
59
60 BitMap::idx_t first_live_segment() const;
61 BitMap::idx_t next_live_segment(BitMap::idx_t segment) const;
62 BitMap::idx_t index_to_segment(BitMap::idx_t index) const;
63
64 bool claim_segment(BitMap::idx_t segment);
65
66 void reset(size_t index);
67 void reset_segment(BitMap::idx_t segment);
68
69 void iterate_segment(ObjectClosure* cl, BitMap::idx_t segment, uintptr_t page_start, size_t page_object_alignment_shift);
70
71public:
72 ZLiveMap(uint32_t size);
73
74 void reset();
75 void resize(uint32_t size);
76
77 bool is_marked() const;
78
79 uint32_t live_objects() const;
80 size_t live_bytes() const;
81
82 bool get(size_t index) const;
83 bool set_atomic(size_t index, bool finalizable, bool& inc_live);
84
85 void inc_live_atomic(uint32_t objects, size_t bytes);
86
87 void iterate(ObjectClosure* cl, uintptr_t page_start, size_t page_object_alignment_shift);
88};
89
90#endif // SHARE_GC_Z_ZLIVEMAP_HPP
91