1/*
2 * Copyright (c) 2014, 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.
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12 * version 2 for more details (a copy is included in the LICENSE file that
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24
25#ifndef SHARE_JFR_LEAKPROFILER_CHAINS_BITSET_HPP
26#define SHARE_JFR_LEAKPROFILER_CHAINS_BITSET_HPP
27
28#include "memory/allocation.hpp"
29#include "oops/oopsHierarchy.hpp"
30#include "utilities/bitMap.inline.hpp"
31
32class JfrVirtualMemory;
33class MemRegion;
34
35class BitSet : public CHeapObj<mtTracing> {
36 private:
37 JfrVirtualMemory* _vmm;
38 const HeapWord* const _region_start;
39 BitMapView _bits;
40 const size_t _region_size;
41
42 public:
43 BitSet(const MemRegion& covered_region);
44 ~BitSet();
45
46 bool initialize();
47
48 BitMap::idx_t mark_obj(const HeapWord* addr) {
49 const BitMap::idx_t bit = addr_to_bit(addr);
50 _bits.set_bit(bit);
51 return bit;
52 }
53
54 BitMap::idx_t mark_obj(oop obj) {
55 return mark_obj((HeapWord*)obj);
56 }
57
58 bool is_marked(const HeapWord* addr) const {
59 return is_marked(addr_to_bit(addr));
60 }
61
62 bool is_marked(oop obj) const {
63 return is_marked((HeapWord*)obj);
64 }
65
66 BitMap::idx_t size() const {
67 return _bits.size();
68 }
69
70 BitMap::idx_t addr_to_bit(const HeapWord* addr) const {
71 return pointer_delta(addr, _region_start) >> LogMinObjAlignment;
72 }
73
74 bool is_marked(const BitMap::idx_t bit) const {
75 return _bits.at(bit);
76 }
77};
78
79#endif // SHARE_JFR_LEAKPROFILER_CHAINS_BITSET_HPP
80