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Datei: zVirtualMemory.hpp Sprache: C

/*
* Copyright (c) 2015, 2020, 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_ZVIRTUALMEMORY_HPP
#define SHARE_GC_Z_ZVIRTUALMEMORY_HPP

#include "gc/z/zMemory.hpp"

class ZVirtualMemory {
  friend class VMStructs;

private:
  uintptr_t _start;
  uintptr_t _end;

public:
  ZVirtualMemory();
  ZVirtualMemory(uintptr_t start, size_t size);

  bool is_null() const;
  uintptr_t start() const;
  uintptr_t end() const;
  size_t size() const;

  ZVirtualMemory split(size_t size);
};

class ZVirtualMemoryManager {
private:
  ZMemoryManager _manager;
  uintptr_t      _reserved;
  bool           _initialized;

  // Platform specific implementation
  void pd_initialize_before_reserve();
  void pd_initialize_after_reserve();
  bool pd_reserve(uintptr_t addr, size_t size);
  void pd_unreserve(uintptr_t addr, size_t size);

  bool reserve_contiguous(uintptr_t start, size_t size);
  bool reserve_contiguous(size_t size);
  size_t reserve_discontiguous(uintptr_t start, size_t size, size_t min_range);
  size_t reserve_discontiguous(size_t size);
  bool reserve(size_t max_capacity);

  void nmt_reserve(uintptr_t start, size_t size);

public:
  ZVirtualMemoryManager(size_t max_capacity);

  bool is_initialized() const;

  size_t reserved() const;
  uintptr_t lowest_available_address() const;

  ZVirtualMemory alloc(size_t size, bool force_low_address);
  void free(const ZVirtualMemory& vmem);
};

#endif // SHARE_GC_Z_ZVIRTUALMEMORY_HPP

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