src/hotspot/share/gc/z/zNMT.hpp

/*
 * Copyright (c) 2023, 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.
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#ifndef SHARE_GC_Z_ZNMT_HPP
#define SHARE_GC_Z_ZNMT_HPP

#include "gc/z/zAddress.hpp"
#include "gc/z/zGlobals.hpp"
#include "gc/z/zMemory.hpp"
#include "gc/z/zVirtualMemory.hpp"
#include "memory/allStatic.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/nativeCallStack.hpp"

class ZNMT : public AllStatic {
private:
  struct Reservation {
    zaddress_unsafe _start;
    size_t          _size;
  };
  static Reservation _reservations[ZMaxVirtualReservations];
  static size_t      _num_reservations;

  static size_t reservation_index(zoffset offset, size_t* offset_in_reservation);
  static void process_fake_mapping(zoffset offset, size_t size, bool commit);

public:
  static void reserve(zaddress_unsafe start, size_t size);
  static void commit(zoffset offset, size_t size);
  static void uncommit(zoffset offset, size_t size);
};

#endif // SHARE_GC_Z_ZNMT_HPP