/*

 * Copyright (c) 2019, SAP SE. All rights reserved.

 * Copyright (c) 2019, 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 "memory/metaspace/commitMask.hpp"

#include "memory/metaspace/metaspaceCommon.hpp"

#include "memory/metaspace/settings.hpp"

#include "runtime/stubRoutines.hpp"

#include "utilities/align.hpp"

#include "utilities/debug.hpp"

namespace metaspace {

CommitMask::CommitMask(const MetaWord* start, size_t word_size)

  : CHeapBitMap(mask_size(word_size, Settings::commit_granule_words()))

  , _base(start)

  , _word_size(word_size)

  , _words_per_bit(Settings::commit_granule_words())

{

  assert(_word_size > 0 && _words_per_bit > 0 &&

         is_aligned(_word_size, _words_per_bit), "Sanity");

}

#ifdef ASSERT

static const bool TEST_UNCOMMITTED_REGION = false;

volatile u1 x;

  // Walk the whole commit mask.

  // For each 1 bit, check if the associated granule is accessible.

  // For each 0 bit, check if the associated granule is not accessible. Slow mode only.

  assert_is_aligned(_base, _words_per_bit * BytesPerWord);

  assert_is_aligned(_word_size, _words_per_bit);

    for (idx_t i = 0; i < size(); i ++) {

      const MetaWord* const p = _base + (i * _words_per_bit);

      if (at(i)) {

        // Should be accessible. Just touch it.

      } else {

        }

      }

    }

  }

}

#endif // ASSERT

void CommitMask::print_on(outputStream* st) const {

  st->print("commit mask, base " PTR_FORMAT ":", p2i(base()));

  for (idx_t i = 0; i < size(); i ++) {

    st->print("%c", at(i) ? 'X' : '-');

  }

  st->cr();

}

} // namespace metaspace