1 /* 2 * Copyright (c) 2014, 2019, Oracle and/or its affiliates. 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_JFR_LEAKPROFILER_CHAINS_BITSET_HPP 26 #define SHARE_JFR_LEAKPROFILER_CHAINS_BITSET_HPP 27 28 #include "memory/allocation.hpp" 29 #include "oops/oopsHierarchy.hpp" 30 #include "utilities/bitMap.inline.hpp" 31 32 class JfrVirtualMemory; 33 class MemRegion; 34 35 class BitSet : public CHeapObj<mtTracing> { 36 private: 37 JfrVirtualMemory* _vmm; 38 const HeapWord* const _region_start; 39 BitMapView _bits; 40 const size_t _region_size; 41 42 public: 43 BitSet(const MemRegion& covered_region); 44 ~BitSet(); 45 46 bool initialize(); 47 48 BitMap::idx_t mark_obj(const HeapWord* addr) { 49 const BitMap::idx_t bit = addr_to_bit(addr); 50 _bits.set_bit(bit); 51 return bit; 52 } 53 54 BitMap::idx_t mark_obj(oop obj) { 55 return mark_obj((HeapWord*)obj); 56 } 57 58 bool is_marked(const HeapWord* addr) const { 59 return is_marked(addr_to_bit(addr)); 60 } 61 62 bool is_marked(oop obj) const { 63 return is_marked((HeapWord*)obj); 64 } 65 66 BitMap::idx_t size() const { 67 return _bits.size(); 68 } 69 70 BitMap::idx_t addr_to_bit(const HeapWord* addr) const { 71 return pointer_delta(addr, _region_start) >> LogMinObjAlignment; 72 } 73 74 bool is_marked(const BitMap::idx_t bit) const { 75 return _bits.at(bit); 76 } 77 }; 78 79 #endif // SHARE_JFR_LEAKPROFILER_CHAINS_BITSET_HPP