/*

 * 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/z/zPage.inline.hpp"

#include "gc/z/zPageTable.inline.hpp"

#include "runtime/orderAccess.hpp"

#include "utilities/debug.hpp"

ZPageTable::ZPageTable() :

    _map() {}

ZPageTableEntry ZPageTable::get_entry(ZPage* page) const {

  const uintptr_t addr = ZAddress::good(page->start());

  return _map.get(addr);

}

void ZPageTable::put_entry(ZPage* page, ZPageTableEntry entry) {

  // Make sure a newly created page is globally visible before

  // updating the pagetable.

  OrderAccess::storestore();

  const uintptr_t start = ZAddress::good(page->start());

  const uintptr_t end = start + page->size();

    _map.put(addr, entry);

  }

}

void ZPageTable::insert(ZPage* page) {

  assert(get_entry(page).page() == NULL ||

         get_entry(page).page() == page, "Invalid entry");

  // Cached pages stays in the pagetable and we must not re-insert

  // those when they get re-allocated because they might also be

  // relocating and we don't want to clear their relocating bit.

  if (get_entry(page).page() == NULL) {

    ZPageTableEntry entry(page, false /* relocating */);

    put_entry(page, entry);

  }

  assert(get_entry(page).page() == page, "Invalid entry");

}

void ZPageTable::remove(ZPage* page) {

  assert(get_entry(page).page() == page, "Invalid entry");

  ZPageTableEntry entry;

  put_entry(page, entry);

  assert(get_entry(page).page() == NULL, "Invalid entry");

}

void ZPageTable::set_relocating(ZPage* page) {

  assert(get_entry(page).page() == page, "Invalid entry");

  assert(!get_entry(page).relocating(), "Invalid entry");

  ZPageTableEntry entry(page, true /* relocating */);

  put_entry(page, entry);

  assert(get_entry(page).page() == page, "Invalid entry");

  assert(get_entry(page).relocating(), "Invalid entry");

}

void ZPageTable::clear_relocating(ZPage* page) {

  assert(get_entry(page).page() == page, "Invalid entry");

  assert(get_entry(page).relocating(), "Invalid entry");

  ZPageTableEntry entry(page, false /* relocating */);

  put_entry(page, entry);

  assert(get_entry(page).page() == page, "Invalid entry");

  assert(!get_entry(page).relocating(), "Invalid entry");

}