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 size_t const _map_size; 37 size_t const _region_size_bytes_shift; 38 jbyte* const _cset_map; 39 // Bias cset map's base address for fast test if an oop is in cset 40 jbyte* const _biased_cset_map; 41 42 ShenandoahHeap* const _heap; 43 44 size_t _garbage; 45 size_t _live_data; 46 size_t _used; 47 size_t _region_count; 48 49 volatile jint _current_index; 50 public: 51 ShenandoahCollectionSet(ShenandoahHeap* heap, HeapWord* heap_base); 52 53 // Add region to collection set 54 void add_region(ShenandoahHeapRegion* r); 55 56 // Bring per-region statuses to consistency with this collection. 57 // TODO: This is a transitional interface that bridges the gap between 58 // region statuses and this collection. Should go away after we merge them. 59 void update_region_status(); 60 61 // Remove region from collection set 62 void remove_region(ShenandoahHeapRegion* r); 63 64 // MT version 65 ShenandoahHeapRegion* claim_next(); 66 67 // Single-thread version 68 ShenandoahHeapRegion* next(); 69 70 size_t count() const { return _region_count; } 71 bool is_empty() const { return _region_count == 0; } 72 73 void clear_current_index() { 74 _current_index = 0; 75 } 76 77 inline bool is_in(ShenandoahHeapRegion* r) const; 78 inline bool is_in(size_t region_number) const; 79 inline bool is_in(HeapWord* p) const; 80 81 void print_on(outputStream* out) const; 82 83 size_t used() const { return _used; } 84 size_t live_data() const { return _live_data; } 85 size_t garbage() const { return _garbage; } 86 void clear(); 87 88 private: 89 jbyte* biased_map_address() const { 90 return _biased_cset_map; 91 } 92 }; 93 94 #endif //SHARE_VM_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_HPP