47ca2c4300
Change HeapWord and MetaWord to be pointers to incomplete types. Reviewed-by: tschatzl, mikael, coleenp, pliden
79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*
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* Copyright (c) 2018, 2019, Red Hat, Inc. All rights reserved.
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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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*/
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#ifndef SHARE_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_HPP
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#define SHARE_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_HPP
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#include "gc/shared/markBitMap.hpp"
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#include "memory/allocation.hpp"
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#include "memory/memRegion.hpp"
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#include "oops/oopsHierarchy.hpp"
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/**
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* Encapsulate a marking bitmap with the top-at-mark-start and top-bitmaps array.
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*/
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class ShenandoahMarkingContext : public CHeapObj<mtGC> {
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private:
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MarkBitMap _mark_bit_map;
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HeapWord** const _top_bitmaps;
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HeapWord** const _top_at_mark_starts_base;
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HeapWord** const _top_at_mark_starts;
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ShenandoahSharedFlag _is_complete;
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public:
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ShenandoahMarkingContext(MemRegion heap_region, MemRegion bitmap_region, size_t num_regions);
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/*
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* Marks the object. Returns true if the object has not been marked before and has
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* been marked by this thread. Returns false if the object has already been marked,
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* or if a competing thread succeeded in marking this object.
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*/
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inline bool mark(oop obj);
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inline bool is_marked(oop obj) const;
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inline bool allocated_after_mark_start(HeapWord* addr) const;
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inline MarkBitMap* mark_bit_map();
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HeapWord* top_at_mark_start(ShenandoahHeapRegion* r) const;
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void capture_top_at_mark_start(ShenandoahHeapRegion* r);
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void reset_top_at_mark_start(ShenandoahHeapRegion* r);
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void initialize_top_at_mark_start(ShenandoahHeapRegion* r);
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void reset_top_bitmap(ShenandoahHeapRegion *r);
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void clear_bitmap(ShenandoahHeapRegion *r);
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bool is_bitmap_clear() const;
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bool is_bitmap_clear_range(HeapWord* start, HeapWord* end) const;
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bool is_complete();
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void mark_complete();
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void mark_incomplete();
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};
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#endif // SHARE_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_HPP
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