| /* |
| * Copyright (c) 2018, Red Hat, Inc. All rights reserved. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_HPP |
| #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_HPP |
| |
| #include "gc/shenandoah/markBitMap.hpp" |
| #include "memory/allocation.hpp" |
| #include "memory/memRegion.hpp" |
| #include "oops/oopsHierarchy.hpp" |
| |
| class HeapWord; |
| |
| /** |
| * Encapsulate a marking bitmap with the top-at-mark-start and top-bitmaps array. |
| */ |
| class ShenandoahMarkingContext : public CHeapObj<mtGC> { |
| private: |
| MarkBitMap _mark_bit_map; |
| |
| HeapWord** const _top_bitmaps; |
| HeapWord** const _top_at_mark_starts_base; |
| HeapWord** const _top_at_mark_starts; |
| |
| ShenandoahSharedFlag _is_complete; |
| |
| public: |
| ShenandoahMarkingContext(MemRegion heap_region, MemRegion bitmap_region, size_t num_regions); |
| |
| /* |
| * Marks the object. Returns true if the object has not been marked before and has |
| * been marked by this thread. Returns false if the object has already been marked, |
| * or if a competing thread succeeded in marking this object. |
| */ |
| inline bool mark(oop obj); |
| |
| inline bool is_marked(oop obj) const; |
| |
| inline bool allocated_after_mark_start(oop obj) const; |
| inline bool allocated_after_mark_start(HeapWord* addr) const; |
| |
| inline MarkBitMap* mark_bit_map(); |
| |
| inline HeapWord* top_at_mark_start(ShenandoahHeapRegion* r) const; |
| inline void capture_top_at_mark_start(ShenandoahHeapRegion* r); |
| inline void reset_top_at_mark_start(ShenandoahHeapRegion* r); |
| void initialize_top_at_mark_start(ShenandoahHeapRegion* r); |
| |
| inline void reset_top_bitmap(ShenandoahHeapRegion *r); |
| void clear_bitmap(ShenandoahHeapRegion *r); |
| |
| bool is_bitmap_clear() const; |
| bool is_bitmap_clear_range(HeapWord* start, HeapWord* end) const; |
| |
| bool is_complete(); |
| void mark_complete(); |
| void mark_incomplete(); |
| |
| }; |
| |
| #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHMARKINGCONTEXT_HPP |