/*

 * 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.

 */

#ifndef SHARE_GC_Z_ZMEMORY_HPP

#define SHARE_GC_Z_ZMEMORY_HPP

#include "gc/z/zList.hpp"

#include "memory/allocation.hpp"

class ZMemory : public CHeapObj<mtGC> {

  friend class ZList<ZMemory>;

private:

  uintptr_t          _start;

  uintptr_t          _end;

  ZListNode<ZMemory> _node;

public:

  ZMemory(uintptr_t start, size_t size);

  uintptr_t start() const;

  uintptr_t end() const;

  size_t size() const;

  void shrink_from_front(size_t size);

  void shrink_from_back(size_t size);

  void grow_from_front(size_t size);

  void grow_from_back(size_t size);

};

class ZMemoryManager {

private:

  ZList<ZMemory> _freelist;

public:

  uintptr_t alloc_from_front(size_t size);

  uintptr_t alloc_from_front_at_most(size_t size, size_t* allocated);

  uintptr_t alloc_from_back(size_t size);

  uintptr_t alloc_from_back_at_most(size_t size, size_t* allocated);

  void free(uintptr_t start, size_t size);

};

#endif // SHARE_GC_Z_ZMEMORY_HPP