text: /*
   * Copyright (c) 2015, 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 "gc/z/zGlobals.hpp"
  #include "gc/z/zGranuleMap.inline.hpp"
  #include "gc/z/zPage.inline.hpp"
  #include "gc/z/zPageTable.inline.hpp"
  #include "runtime/orderAccess.hpp"
  #include "utilities/debug.hpp"
  
  ZPageTable::ZPageTable() :
      _map(ZAddressOffsetMax) {}
  
  void ZPageTable::insert(ZPage* page) {
    const uintptr_t offset = page->start();
    const size_t size = page->size();
  
    // Make sure a newly created page is
    // visible before updating the page table.
    OrderAccess::storestore();
  
    assert(_map.get(offset) == NULL, "Invalid entry");
    _map.put(offset, size, page);
  }
  
  void ZPageTable::remove(ZPage* page) {
    const uintptr_t offset = page->start();
    const size_t size = page->size();
  
    assert(_map.get(offset) == page, "Invalid entry");
    _map.put(offset, size, NULL);
  }
  