1/*
2 * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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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
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24
25#ifndef SHARE_GC_G1_G1CONCURRENTMARKBITMAP_HPP
26#define SHARE_GC_G1_G1CONCURRENTMARKBITMAP_HPP
27
28#include "gc/g1/g1RegionToSpaceMapper.hpp"
29#include "gc/shared/markBitMap.hpp"
30#include "memory/memRegion.hpp"
31#include "oops/oopsHierarchy.hpp"
32#include "utilities/bitMap.hpp"
33#include "utilities/globalDefinitions.hpp"
34#include "utilities/macros.hpp"
35
36class G1CMBitMap;
37class G1CMTask;
38class G1ConcurrentMark;
39class HeapRegion;
40
41// Closure for iteration over bitmaps
42class G1CMBitMapClosure {
43 G1ConcurrentMark* const _cm;
44 G1CMTask* const _task;
45public:
46 G1CMBitMapClosure(G1CMTask *task, G1ConcurrentMark* cm) : _cm(cm), _task(task) { }
47
48 bool do_addr(HeapWord* const addr);
49};
50
51class G1CMBitMapMappingChangedListener : public G1MappingChangedListener {
52 G1CMBitMap* _bm;
53public:
54 G1CMBitMapMappingChangedListener() : _bm(NULL) {}
55
56 void set_bitmap(G1CMBitMap* bm) { _bm = bm; }
57
58 virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled);
59};
60
61// A generic mark bitmap for concurrent marking. This is essentially a wrapper
62// around the BitMap class that is based on HeapWords, with one bit per (1 << _shifter) HeapWords.
63class G1CMBitMap : public MarkBitMap {
64
65 G1CMBitMapMappingChangedListener _listener;
66
67protected:
68
69 virtual void check_mark(HeapWord* addr) NOT_DEBUG_RETURN;
70
71public:
72
73 G1CMBitMap() : MarkBitMap(), _listener() { _listener.set_bitmap(this); }
74
75 // Initializes the underlying BitMap to cover the given area.
76 void initialize(MemRegion heap, G1RegionToSpaceMapper* storage);
77
78 // Apply the closure to the addresses that correspond to marked bits in the bitmap.
79 inline bool iterate(G1CMBitMapClosure* cl, MemRegion mr);
80
81 void clear_region(HeapRegion* hr);
82};
83
84#endif // SHARE_GC_G1_G1CONCURRENTMARKBITMAP_HPP
85