/*

 * Copyright (c) 2001, 2016, 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/g1FromCardCache.hpp"

#include "gc/g1/g1RemSet.hpp"

#include "memory/padded.inline.hpp"

#include "utilities/debug.hpp"

uintptr_t** G1FromCardCache::_cache = NULL;

uint        G1FromCardCache::_max_regions = 0;

size_t      G1FromCardCache::_static_mem_size = 0;

#ifdef ASSERT

uint   G1FromCardCache::_max_workers = 0;

#endif

void G1FromCardCache::initialize(uint num_par_rem_sets, uint max_num_regions) {

  guarantee(max_num_regions > 0, "Heap size must be valid");

  guarantee(_cache == NULL, "Should not call this multiple times");

  _max_regions = max_num_regions;

#ifdef ASSERT

  _max_workers = num_par_rem_sets;

#endif

  _cache = Padded2DArray<uintptr_t, mtGC>::create_unfreeable(_max_regions,

                                                             num_par_rem_sets,

                                                             &_static_mem_size);

  invalidate(0, _max_regions);

}

void G1FromCardCache::invalidate(uint start_idx, size_t new_num_regions) {

  guarantee((size_t)start_idx + new_num_regions <= max_uintx,

            "Trying to invalidate beyond maximum region, from %u size " SIZE_FORMAT,

            start_idx, new_num_regions);

  uint end_idx = (start_idx + (uint)new_num_regions);

  assert(end_idx <= _max_regions, "Must be within max.");

  for (uint i = 0; i < G1RemSet::num_par_rem_sets(); i++) {

    for (uint j = start_idx; j < end_idx; j++) {

      set(i, j, InvalidCard);

    }

  }

}

#ifndef PRODUCT

void G1FromCardCache::print(outputStream* out) {

  for (uint i = 0; i < G1RemSet::num_par_rem_sets(); i++) {

    for (uint j = 0; j < _max_regions; j++) {

      out->print_cr("_from_card_cache[%u][%u] = " SIZE_FORMAT ".",

                    i, j, at(i, j));

    }

  }

}

#endif

void G1FromCardCache::clear(uint region_idx) {

  uint num_par_remsets = G1RemSet::num_par_rem_sets();

  for (uint i = 0; i < num_par_remsets; i++) {

    set(i, region_idx, InvalidCard);

  }

}