/*

 * Copyright (c) 2017, 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/g1/g1CollectedHeap.inline.hpp"

#include "gc/g1/g1ConcurrentMarkBitMap.inline.hpp"

#include "gc/g1/heapRegion.hpp"

#include "memory/virtualspace.hpp"

void G1CMBitMap::print_on_error(outputStream* st, const char* prefix) const {

  _bm.print_on_error(st, prefix);

}

size_t G1CMBitMap::compute_size(size_t heap_size) {

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

}

size_t G1CMBitMap::mark_distance() {

  return MinObjAlignmentInBytes * BitsPerByte;

}

void G1CMBitMap::initialize(MemRegion heap, G1RegionToSpaceMapper* storage) {

  _covered = heap;

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

  storage->set_mapping_changed_listener(&_listener);

}

void G1CMBitMapMappingChangedListener::on_commit(uint start_region, size_t num_regions, bool zero_filled) {

  if (zero_filled) {

    return;

  }

  // We need to clear the bitmap on commit, removing any existing information.

  MemRegion mr(G1CollectedHeap::heap()->bottom_addr_for_region(start_region), num_regions * HeapRegion::GrainWords);

  _bm->clear_range(mr);

}

void G1CMBitMap::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);

}

void G1CMBitMap::clear_region(HeapRegion* region) {

 if (!region->is_empty()) {

   MemRegion mr(region->bottom(), region->top());

   clear_range(mr);

 }

}