/*

 * Copyright (c) 2015, 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_ZOBJECTALLOCATOR_HPP

#define SHARE_GC_Z_ZOBJECTALLOCATOR_HPP

#include "gc/z/zAllocationFlags.hpp"

#include "gc/z/zPage.hpp"

#include "gc/z/zValue.hpp"

#include "memory/allocation.hpp"

class ZObjectAllocator {

private:

  const uint         _nworkers;

  ZPerCPU<size_t>    _used;

  ZContended<ZPage*> _shared_medium_page;

  ZPerCPU<ZPage*>    _shared_small_page;

  ZPerWorker<ZPage*> _worker_small_page;

  ZPage* alloc_page(uint8_t type, size_t size, ZAllocationFlags flags);

  // Allocate an object in a shared page. Allocate and

  // atomically install a new page if neccesary.

  uintptr_t alloc_object_in_shared_page(ZPage** shared_page,

                                        uint8_t page_type,

                                        size_t page_size,

                                        size_t size,

                                        ZAllocationFlags flags);

  uintptr_t alloc_large_object(size_t size, ZAllocationFlags flags);

  uintptr_t alloc_medium_object(size_t size, ZAllocationFlags flags);

  uintptr_t alloc_small_object_from_nonworker(size_t size, ZAllocationFlags flags);

  uintptr_t alloc_small_object_from_worker(size_t size, ZAllocationFlags flags);

  uintptr_t alloc_small_object(size_t size, ZAllocationFlags flags);

  uintptr_t alloc_object(size_t size, ZAllocationFlags flags);

  bool undo_alloc_large_object(ZPage* page);

  bool undo_alloc_medium_object(ZPage* page, uintptr_t addr, size_t size);

  bool undo_alloc_small_object_from_nonworker(ZPage* page, uintptr_t addr, size_t size);

  bool undo_alloc_small_object_from_worker(ZPage* page, uintptr_t addr, size_t size);

  bool undo_alloc_small_object(ZPage* page, uintptr_t addr, size_t size);

  bool undo_alloc_object(ZPage* page, uintptr_t addr, size_t size);

public:

  ZObjectAllocator(uint nworkers);

  uintptr_t alloc_object(size_t size);

  uintptr_t alloc_object_for_relocation(size_t size);

  void undo_alloc_object_for_relocation(ZPage* page, uintptr_t addr, size_t size);

  size_t used() const;

  size_t remaining() const;

  void retire_tlabs();

  void remap_tlabs();

};

#endif // SHARE_GC_Z_ZOBJECTALLOCATOR_HPP