1 /* 2 * Copyright (c) 2016, 2020, Red Hat, Inc. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_HPP 26 #define SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_HPP 27 28 #include "memory/allocation.hpp" 29 #include "memory/virtualspace.hpp" 30 #include "gc/shenandoah/shenandoahHeap.hpp" 31 #include "gc/shenandoah/shenandoahHeapRegion.hpp" 32 #include "gc/shenandoah/shenandoahPadding.hpp" 33 34 class ShenandoahCollectionSet : public CHeapObj<mtGC> { 35 friend class ShenandoahHeap; 36 private: 37 size_t const _map_size; 38 size_t const _region_size_bytes_shift; 39 ReservedSpace _map_space; 40 char* const _cset_map; 41 // Bias cset map's base address for fast test if an oop is in cset 42 char* const _biased_cset_map; 43 44 ShenandoahHeap* const _heap; 45 46 size_t _garbage; 47 size_t _used; 48 size_t _region_count; 49 50 shenandoah_padding(0); 51 volatile size_t _current_index; 52 shenandoah_padding(1); 53 54 public: 55 ShenandoahCollectionSet(ShenandoahHeap* heap, ReservedSpace space, char* heap_base); 56 57 // Add region to collection set 58 void add_region(ShenandoahHeapRegion* r); 59 60 // MT version 61 ShenandoahHeapRegion* claim_next(); 62 63 // Single-thread version 64 ShenandoahHeapRegion* next(); 65 count() const66 size_t count() const { return _region_count; } is_empty() const67 bool is_empty() const { return _region_count == 0; } 68 clear_current_index()69 void clear_current_index() { 70 _current_index = 0; 71 } 72 73 inline bool is_in(ShenandoahHeapRegion* r) const; 74 inline bool is_in(size_t region_idx) const; 75 inline bool is_in(oop obj) const; 76 inline bool is_in_loc(void* loc) const; 77 78 void print_on(outputStream* out) const; 79 used() const80 size_t used() const { return _used; } garbage() const81 size_t garbage() const { return _garbage; } 82 void clear(); 83 84 private: map_address() const85 char* map_address() const { 86 return _cset_map; 87 } biased_map_address() const88 char* biased_map_address() const { 89 return _biased_cset_map; 90 } 91 }; 92 93 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_HPP 94