91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
/*
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* Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#ifndef SHARE_GC_Z_ZLIVEMAP_HPP
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#define SHARE_GC_Z_ZLIVEMAP_HPP
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#include "gc/z/zBitMap.hpp"
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#include "memory/allocation.hpp"
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class ObjectClosure;
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class ZLiveMap {
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friend class ZLiveMapTest;
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private:
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static const size_t nsegments = 64;
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volatile uint32_t _seqnum;
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volatile uint32_t _live_objects;
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volatile size_t _live_bytes;
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BitMap::bm_word_t _segment_live_bits;
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BitMap::bm_word_t _segment_claim_bits;
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ZBitMap _bitmap;
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size_t _segment_shift;
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const BitMapView segment_live_bits() const;
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const BitMapView segment_claim_bits() const;
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BitMapView segment_live_bits();
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BitMapView segment_claim_bits();
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BitMap::idx_t segment_size() const;
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BitMap::idx_t segment_start(BitMap::idx_t segment) const;
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BitMap::idx_t segment_end(BitMap::idx_t segment) const;
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bool is_segment_live(BitMap::idx_t segment) const;
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bool set_segment_live_atomic(BitMap::idx_t segment);
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BitMap::idx_t first_live_segment() const;
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BitMap::idx_t next_live_segment(BitMap::idx_t segment) const;
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BitMap::idx_t index_to_segment(BitMap::idx_t index) const;
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bool claim_segment(BitMap::idx_t segment);
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void reset(size_t index);
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void reset_segment(BitMap::idx_t segment);
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void iterate_segment(ObjectClosure* cl, BitMap::idx_t segment, uintptr_t page_start, size_t page_object_alignment_shift);
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public:
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ZLiveMap(uint32_t size);
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void reset();
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void resize(uint32_t size);
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bool is_marked() const;
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uint32_t live_objects() const;
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size_t live_bytes() const;
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bool get(size_t index) const;
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bool set_atomic(size_t index, bool finalizable, bool& inc_live);
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void inc_live_atomic(uint32_t objects, size_t bytes);
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void iterate(ObjectClosure* cl, uintptr_t page_start, size_t page_object_alignment_shift);
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};
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#endif // SHARE_GC_Z_ZLIVEMAP_HPP
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