/*

 * Copyright (c) 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.

 *

 */

#include "precompiled.hpp"

#include "gc/shared/markBitMap.inline.hpp"

#include "memory/virtualspace.hpp"

void MarkBitMap::print_on_error(outputStream* st, const char* prefix) const {

  _bm.print_on_error(st, prefix);

}

size_t MarkBitMap::compute_size(size_t heap_size) {

  return ReservedSpace::allocation_align_size_up(heap_size / mark_distance());

}

size_t MarkBitMap::mark_distance() {

  return MinObjAlignmentInBytes * BitsPerByte;

}

void MarkBitMap::initialize(MemRegion heap, MemRegion storage) {

  _covered = heap;

  _bm = BitMapView((BitMap::bm_word_t*) storage.start(), _covered.word_size() >> _shifter);

}

void MarkBitMap::clear_range(MemRegion mr) {

  MemRegion intersection = mr.intersection(_covered);

  assert(!intersection.is_empty(),

         "Given range from " PTR_FORMAT " to " PTR_FORMAT " is completely outside the heap",

         p2i(mr.start()), p2i(mr.end()));

  // convert address range into offset range

  _bm.at_put_range(addr_to_offset(intersection.start()),

                   addr_to_offset(intersection.end()), false);

}

#ifdef ASSERT

void MarkBitMap::check_mark(HeapWord* addr) {

  assert(Universe::heap()->is_in_reserved(addr),

         "Trying to access bitmap " PTR_FORMAT " for address " PTR_FORMAT " not in the heap.",

         p2i(this), p2i(addr));

}

#endif