/*

 * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * 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_VM_JFR_LEAKPROFILER_CHAINS_BITSET_HPP

#define SHARE_VM_JFR_LEAKPROFILER_CHAINS_BITSET_HPP

#include "memory/allocation.hpp"

#include "oops/oopsHierarchy.hpp"

#include "utilities/bitMap.inline.hpp"

class JfrVirtualMemory;

class MemRegion;

class BitSet : public CHeapObj<mtTracing> {

 private:

  JfrVirtualMemory* _vmm;

  const HeapWord* const _region_start;

  BitMapView _bits;

  const size_t _region_size;

 public:

  BitSet(const MemRegion& covered_region);

  ~BitSet();

  bool initialize();

  BitMap::idx_t mark_obj(const HeapWord* addr) {

    const BitMap::idx_t bit = addr_to_bit(addr);

    _bits.par_set_bit(bit);

    return bit;

  }

  BitMap::idx_t mark_obj(oop obj) {

    return mark_obj((HeapWord*)obj);

  }

  bool is_marked(const HeapWord* addr) const {

    return is_marked(addr_to_bit(addr));

  }

  bool is_marked(oop obj) const {

    return is_marked((HeapWord*)obj);

  }

  BitMap::idx_t size() const {

    return _bits.size();

  }

  BitMap::idx_t addr_to_bit(const HeapWord* addr) const {

    return pointer_delta(addr, _region_start) >> LogMinObjAlignment;

  }

  bool is_marked(const BitMap::idx_t bit) const {

    return _bits.at(bit);

  }

};

#endif  // SHARE_VM_JFR_LEAKPROFILER_CHAINS_BITSET_HPP