1 /* 2 * Copyright (c) 2016, Red Hat, Inc. and/or its affiliates. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 25 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_HPP 26 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_HPP 27 28 #include "memory/allocation.hpp" 29 30 class ShenandoahHeap; 31 class ShenandoahHeapRegion; 32 33 class ShenandoahCollectionSet : public CHeapObj<mtGC> { 34 friend class ShenandoahHeap; 35 private: 36 jbyte* _cset_map; 37 jbyte* _biased_cset_map; 38 size_t _map_size; 39 40 ShenandoahHeap* const _heap; 41 42 size_t _garbage; 43 size_t _live_data; 44 size_t _region_count; 45 46 volatile jint _current_index; 47 public: 48 ShenandoahCollectionSet(ShenandoahHeap* heap, HeapWord* heap_base); 49 50 // Add region to collection set 51 void add_region(ShenandoahHeapRegion* r); 52 53 // Bring per-region statuses to consistency with this collection. 54 // TODO: This is a transitional interface that bridges the gap between 55 // region statuses and this collection. Should go away after we merge them. 56 void update_region_status(); 57 58 // Remove region from collection set 59 void remove_region(ShenandoahHeapRegion* r); 60 61 // MT version 62 ShenandoahHeapRegion* claim_next(); 63 64 // Single-thread version 65 ShenandoahHeapRegion* next(); 66 67 size_t count() const { return _region_count; } 68 bool is_empty() const { return _region_count == 0; } 69 70 void clear_current_index() { 71 _current_index = 0; 72 } 73 74 inline bool is_in(ShenandoahHeapRegion* r) const; 75 inline bool is_in(size_t region_number) const; 76 inline bool is_in(HeapWord* p) const; 77 78 void print_on(outputStream* out) const; 79 80 size_t live_data() const { return _live_data; } 81 size_t garbage() const { return _garbage; } 82 void clear(); 83 84 private: 85 jbyte* biased_map_address() const { 86 return _biased_cset_map; 87 } 88 }; 89 90 #endif //SHARE_VM_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_HPP