| /* |
| * Copyright (c) 2016, 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_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_HPP |
| #define SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_HPP |
| |
| #include "memory/allocation.hpp" |
| #include "gc/shenandoah/shenandoahHeap.hpp" |
| #include "gc/shenandoah/shenandoahHeapRegion.hpp" |
| |
| class ShenandoahCollectionSet : public CHeapObj<mtGC> { |
| friend class ShenandoahHeap; |
| private: |
| size_t const _map_size; |
| size_t const _region_size_bytes_shift; |
| ReservedSpace _map_space; |
| char* const _cset_map; |
| // Bias cset map's base address for fast test if an oop is in cset |
| char* const _biased_cset_map; |
| |
| ShenandoahHeap* const _heap; |
| |
| size_t _garbage; |
| size_t _live_data; |
| size_t _used; |
| size_t _region_count; |
| |
| DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile size_t)); |
| volatile jint _current_index; |
| DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, 0); |
| |
| public: |
| ShenandoahCollectionSet(ShenandoahHeap* heap, char* heap_base, size_t size); |
| |
| // Add region to collection set |
| void add_region(ShenandoahHeapRegion* r); |
| bool add_region_check_for_duplicates(ShenandoahHeapRegion* r); |
| |
| // Bring per-region statuses to consistency with this collection. |
| // TODO: This is a transitional interface that bridges the gap between |
| // region statuses and this collection. Should go away after we merge them. |
| void update_region_status(); |
| |
| // Remove region from collection set |
| void remove_region(ShenandoahHeapRegion* r); |
| |
| // MT version |
| ShenandoahHeapRegion* claim_next(); |
| |
| // Single-thread version |
| ShenandoahHeapRegion* next(); |
| |
| size_t count() const { return _region_count; } |
| bool is_empty() const { return _region_count == 0; } |
| |
| void clear_current_index() { |
| _current_index = 0; |
| } |
| |
| inline bool is_in(ShenandoahHeapRegion* r) const; |
| inline bool is_in(size_t region_number) const; |
| inline bool is_in(HeapWord* p) const; |
| |
| void print_on(outputStream* out) const; |
| |
| size_t used() const { return _used; } |
| size_t live_data() const { return _live_data; } |
| size_t garbage() const { return _garbage; } |
| void clear(); |
| |
| private: |
| char* map_address() const { |
| return _cset_map; |
| } |
| char* biased_map_address() const { |
| return _biased_cset_map; |
| } |
| }; |
| |
| #endif // SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_HPP |