/*

 * Copyright (c) 2013, 2014, 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_implementation/g1/g1CardCounts.hpp"

#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"

#include "gc_implementation/g1/g1CollectorPolicy.hpp"

#include "gc_implementation/g1/g1GCPhaseTimes.hpp"

#include "memory/cardTableModRefBS.hpp"

#include "services/memTracker.hpp"

#include "utilities/copy.hpp"

PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC

void G1CardCounts::clear_range(size_t from_card_num, size_t to_card_num) {

  if (has_count_table()) {

    assert(from_card_num < to_card_num,

           err_msg("Wrong order? from: " SIZE_FORMAT ", to: "SIZE_FORMAT,

                   from_card_num, to_card_num));

    Copy::fill_to_bytes(&_card_counts[from_card_num], (to_card_num - from_card_num));

  }

}

G1CardCounts::G1CardCounts(G1CollectedHeap *g1h):

  assert(_g1h->max_capacity() > 0, "initialization order");

  assert(_g1h->capacity() == 0, "initialization order");

  if (G1ConcRSHotCardLimit > 0) {

    // The max value we can store in the counts table is

    // max_jubyte. Guarantee the value of the hot

    // threshold limit is no more than this.

    guarantee(G1ConcRSHotCardLimit <= max_jubyte, "sanity");

    _ct_bs = _g1h->g1_barrier_set();

    _ct_bot = _ct_bs->byte_for_const(_g1h->reserved_region().start());

  }

}

uint G1CardCounts::add_card_count(jbyte* card_ptr) {

  // Returns the number of times the card has been refined.

  // If we failed to reserve/commit the counts table, return 0.

  // If card_ptr is beyond the committed end of the counts table,

  // return 0.

  // Otherwise return the actual count.

  // Unless G1ConcRSHotCardLimit has been set appropriately,

  // returning 0 will result in the card being considered

  // cold and will be refined immediately.

  uint count = 0;

  if (has_count_table()) {

    size_t card_num = ptr_2_card_num(card_ptr);

    }

  }

  return count;

}

bool G1CardCounts::is_hot(uint count) {

  return (count >= G1ConcRSHotCardLimit);

}

void G1CardCounts::clear_region(HeapRegion* hr) {

#ifdef ASSERT

    HeapWord* start_addr = _ct_bs->addr_for(from_card_ptr);

    HeapWord* last_addr = _ct_bs->addr_for(last_card_ptr);

#endif // ASSERT

    // Clear the counts for the (exclusive) card range.

    size_t from_card_num = ptr_2_card_num(from_card_ptr);

    size_t to_card_num = ptr_2_card_num(last_card_ptr) + 1;

    clear_range(from_card_num, to_card_num);

  }

}

void G1CardCounts::clear_all() {

  assert(SafepointSynchronize::is_at_safepoint(), "don't call this otherwise");

}