Quelle markBitMap.cpp Sprache: C

/*
* 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.
*
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#include "precompiled.hpp"
#include "gc/shared/markBitMap.inline.hpp"
#include "memory/universe.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::do_clear(MemRegion mr, bool large) {
  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
  size_t beg = addr_to_offset(intersection.start());
  size_t end = addr_to_offset(intersection.end());
  if (large) {
    _bm.clear_large_range(beg, end);
  } else {
    _bm.clear_range(beg, end);
  }
}

#ifdef ASSERT
void MarkBitMap::check_mark(HeapWord* addr) {
  assert(Universe::heap()->is_in(addr),
         "Trying to access bitmap " PTR_FORMAT " for address " PTR_FORMAT " not in the heap.",
         p2i(this), p2i(addr));
}
#endif

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