/*

 * Copyright (c) 2016, 2018, 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.

 */

#ifndef SHARE_GC_Z_ZMARKSTACKALLOCATOR_HPP

#define SHARE_GC_Z_ZMARKSTACKALLOCATOR_HPP

#include "gc/z/zGlobals.hpp"

#include "gc/z/zLock.hpp"

#include "utilities/globalDefinitions.hpp"

class ZMarkStackSpace {

private:

  ZLock              _expand_lock;

  uintptr_t          _start;

  volatile uintptr_t _top;

  volatile uintptr_t _end;

  void expand();

  uintptr_t alloc_space(size_t size);

  uintptr_t expand_and_alloc_space(size_t size);

public:

  ZMarkStackSpace();

  bool is_initialized() const;

  uintptr_t alloc(size_t size);

};

class ZMarkStackAllocator {

private:

  ZCACHE_ALIGNED ZMarkStackMagazineList _freelist;

  ZCACHE_ALIGNED ZMarkStackSpace        _space;

  void prime_freelist();

  ZMarkStackMagazine* create_magazine_from_space(uintptr_t addr, size_t size);

public:

  ZMarkStackAllocator();

  bool is_initialized() const;

  ZMarkStackMagazine* alloc_magazine();

  void free_magazine(ZMarkStackMagazine* magazine);

};

#endif // SHARE_GC_Z_ZMARKSTACKALLOCATOR_HPP