/*************************************************************************************

    Grid physics library, www.github.com/paboyle/Grid 

    Source file: ./lib/AlignedAllocator.h

    Copyright (C) 2015

Author: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>
Author: Peter Boyle <paboyle@ph.ed.ac.uk>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

    See the full license in the file "LICENSE" in the top level distribution directory
*************************************************************************************/
/*  END LEGAL */
#pragma once

NAMESPACE_BEGIN(Grid);

template<typename _Tp>
class alignedAllocator {
public: 
  typedef std::size_t     size_type;
  typedef std::ptrdiff_t  difference_type;
  typedef _Tp*       pointer;
  typedef const _Tp* const_pointer;
  typedef _Tp&       reference;
  typedef const _Tp& const_reference;
  typedef _Tp        value_type;

  template<typename _Tp1>  struct rebind { typedef alignedAllocator<_Tp1> other; };
  alignedAllocator() throw() { }
  alignedAllocator(const alignedAllocator&) throw() { }
  template<typename _Tp1> alignedAllocator(const alignedAllocator<_Tp1>&) throw() { }
  ~alignedAllocator() throw() { }
  pointer       address(reference __x)       const { return &__x; }
  size_type  max_size() const throw() { return size_t(-1) / sizeof(_Tp); }

  pointer allocate(size_type __n, const void* _p= 0)
  { 
    size_type bytes = __n*sizeof(_Tp);
    profilerAllocate(bytes);
    _Tp *ptr = (_Tp*) MemoryManager::CpuAllocate(bytes);
    assert( ( (_Tp*)ptr != (_Tp *)NULL ) );
    return ptr;
  }

  void deallocate(pointer __p, size_type __n) 
  { 
    size_type bytes = __n * sizeof(_Tp);
    profilerFree(bytes);
    MemoryManager::CpuFree((void *)__p,bytes);
  }

  // FIXME: hack for the copy constructor: it must be avoided to avoid single thread loop
  void construct(pointer __p, const _Tp& __val) { assert(0);};
  void construct(pointer __p) { };
  void destroy(pointer __p) { };
};
template<typename _Tp>  inline bool operator==(const alignedAllocator<_Tp>&, const alignedAllocator<_Tp>&){ return true; }
template<typename _Tp>  inline bool operator!=(const alignedAllocator<_Tp>&, const alignedAllocator<_Tp>&){ return false; }

//////////////////////////////////////////////////////////////////////////////////////
// Unified virtual memory
//////////////////////////////////////////////////////////////////////////////////////
template<typename _Tp>
class uvmAllocator {
public: 
  typedef std::size_t     size_type;
  typedef std::ptrdiff_t  difference_type;
  typedef _Tp*       pointer;
  typedef const _Tp* const_pointer;
  typedef _Tp&       reference;
  typedef const _Tp& const_reference;
  typedef _Tp        value_type;

  template<typename _Tp1>  struct rebind { typedef uvmAllocator<_Tp1> other; };
  uvmAllocator() throw() { }
  uvmAllocator(const uvmAllocator&) throw() { }
  template<typename _Tp1> uvmAllocator(const uvmAllocator<_Tp1>&) throw() { }
  ~uvmAllocator() throw() { }
  pointer       address(reference __x)       const { return &__x; }
  size_type  max_size() const throw() { return size_t(-1) / sizeof(_Tp); }

  pointer allocate(size_type __n, const void* _p= 0)
  { 
    size_type bytes = __n*sizeof(_Tp);
    profilerAllocate(bytes);
    _Tp *ptr = (_Tp*) MemoryManager::SharedAllocate(bytes);
    assert( ( (_Tp*)ptr != (_Tp *)NULL ) );
    return ptr;
  }

  void deallocate(pointer __p, size_type __n) 
  { 
    size_type bytes = __n * sizeof(_Tp);
    profilerFree(bytes);
    MemoryManager::SharedFree((void *)__p,bytes);
  }

  void construct(pointer __p, const _Tp& __val) { new((void *)__p) _Tp(__val); };
  void construct(pointer __p) { };
  void destroy(pointer __p) { };
};
template<typename _Tp>  inline bool operator==(const uvmAllocator<_Tp>&, const uvmAllocator<_Tp>&){ return true; }
template<typename _Tp>  inline bool operator!=(const uvmAllocator<_Tp>&, const uvmAllocator<_Tp>&){ return false; }

////////////////////////////////////////////////////////////////////////////////
// Device memory
////////////////////////////////////////////////////////////////////////////////
template<typename _Tp>
class devAllocator {
public: 
  typedef std::size_t     size_type;
  typedef std::ptrdiff_t  difference_type;
  typedef _Tp*       pointer;
  typedef const _Tp* const_pointer;
  typedef _Tp&       reference;
  typedef const _Tp& const_reference;
  typedef _Tp        value_type;

  template<typename _Tp1>  struct rebind { typedef devAllocator<_Tp1> other; };
  devAllocator() throw() { }
  devAllocator(const devAllocator&) throw() { }
  template<typename _Tp1> devAllocator(const devAllocator<_Tp1>&) throw() { }
  ~devAllocator() throw() { }
  pointer       address(reference __x)       const { return &__x; }
  size_type  max_size() const throw() { return size_t(-1) / sizeof(_Tp); }

  pointer allocate(size_type __n, const void* _p= 0)
  { 
    size_type bytes = __n*sizeof(_Tp);
    profilerAllocate(bytes);
    _Tp *ptr = (_Tp*) MemoryManager::AcceleratorAllocate(bytes);
    assert( ( (_Tp*)ptr != (_Tp *)NULL ) );
    return ptr;
  }

  void deallocate(pointer __p, size_type __n) 
  { 
    size_type bytes = __n * sizeof(_Tp);
    profilerFree(bytes);
    MemoryManager::AcceleratorFree((void *)__p,bytes);
  }
  void construct(pointer __p, const _Tp& __val) { };
  void construct(pointer __p) { };
  void destroy(pointer __p) { };
};
template<typename _Tp>  inline bool operator==(const devAllocator<_Tp>&, const devAllocator<_Tp>&){ return true; }
template<typename _Tp>  inline bool operator!=(const devAllocator<_Tp>&, const devAllocator<_Tp>&){ return false; }

////////////////////////////////////////////////////////////////////////////////
// Template typedefs
////////////////////////////////////////////////////////////////////////////////
#ifdef ACCELERATOR_CSHIFT
// Cshift on device
template<class T> using cshiftAllocator = devAllocator<T>;
#else
// Cshift on host
template<class T> using cshiftAllocator = std::allocator<T>;
#endif

template<class T> using Vector        = std::vector<T,uvmAllocator<T> >;           
template<class T> using stencilVector = std::vector<T,alignedAllocator<T> >;           
template<class T> using commVector = std::vector<T,devAllocator<T> >;
template<class T> using cshiftVector = std::vector<T,cshiftAllocator<T> >;

NAMESPACE_END(Grid);