/*

 * Copyright (c) 2001, 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

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 */

#ifndef SHARE_GC_G1_G1CARDTABLE_INLINE_HPP

#define SHARE_GC_G1_G1CARDTABLE_INLINE_HPP

#include "gc/g1/g1CardTable.hpp"

#include "gc/g1/heapRegion.hpp"

inline uint G1CardTable::region_idx_for(CardValue* p) {

  size_t const card_idx = pointer_delta(p, _byte_map, sizeof(CardValue));

  return (uint)(card_idx >> (HeapRegion::LogOfHRGrainBytes - card_shift));

}

inline void G1CardTable::mark_clean_as_dirty(size_t card_index) {

  CardValue value = _byte_map[card_index];

  if (value == clean_card_val()) {

    _byte_map[card_index] = dirty_card_val();

  }

}

inline void G1CardTable::mark_region_dirty(size_t start_card_index, size_t num_cards) {

  assert(is_aligned(start_card_index, sizeof(size_t)), "Start card index must be aligned.");

  assert(is_aligned(num_cards, sizeof(size_t)), "Number of cards to change must be evenly divisible.");

  size_t const num_chunks = num_cards / sizeof(size_t);

  size_t* cur_word = (size_t*)&_byte_map[start_card_index];

  size_t* const end_word_map = cur_word + num_chunks;

  while (cur_word < end_word_map) {

    size_t value = *cur_word;

    if (value == WordAllClean) {

      *cur_word = WordAllDirty;

    } else if (value == WordAllDirty) {

      // do nothing.

    } else {

      // There is a mix of cards in there. Tread slowly.

      CardValue* cur = (CardValue*)cur_word;

      for (size_t i = 0; i < sizeof(size_t); i++) {

        CardValue value = *cur;

        if (value == clean_card_val()) {

          *cur = dirty_card_val();

        }

        cur++;

      }

    }

    cur_word++;

  }

}

inline void G1CardTable::mark_as_scanned(size_t start_card_index, size_t num_cards) {

  CardValue* start = &_byte_map[start_card_index];

  CardValue* const end = start + num_cards;

  while (start < end) {

    CardValue value = *start;

    assert(value == dirty_card_val(),

           "Must have been dirty %d start " PTR_FORMAT " " PTR_FORMAT, value, p2i(start), p2i(end));

    *start++ = g1_card_already_scanned;

  }

}

#endif /* SHARE_GC_G1_G1CARDTABLE_INLINE_HPP */