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//                        Kokkos v. 2.0
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#ifndef KOKKOS_CUDA_ALLOCATION_TRACKING_HPP
#define KOKKOS_CUDA_ALLOCATION_TRACKING_HPP

#include <Kokkos_Macros.hpp>
#ifdef KOKKOS_ENABLE_CUDA

#include <impl/Kokkos_Traits.hpp>

namespace Kokkos {
namespace Impl {

template< class DestructFunctor >
SharedAllocationRecord *
shared_allocation_record( Kokkos::CudaSpace const & arg_space
                        , void *            const   arg_alloc_ptr
                        , DestructFunctor   const & arg_destruct )
{
  SharedAllocationRecord * const record = SharedAllocationRecord::get_record( arg_alloc_ptr );

  // assert: record != 0

  // assert: sizeof(DestructFunctor) <= record->m_destruct_size

  // assert: record->m_destruct_function == 0

  DestructFunctor * const functor =
    reinterpret_cast< DestructFunctor * >(
    reinterpret_cast< uintptr_t >( record ) + sizeof(SharedAllocationRecord) );

  new( functor ) DestructFunctor( arg_destruct );

  record->m_destruct_functor = & shared_allocation_destroy< DestructFunctor > ;

  return record ;
}


/// class CudaUnmanagedAllocator
/// does nothing when deallocate(ptr,size) is called
struct CudaUnmanagedAllocator
{
  static const char * name()
  {
    return "Cuda Unmanaged Allocator";
  }

  static void deallocate(void * /*ptr*/, size_t /*size*/) {}

  static bool support_texture_binding() { return true; }
};

/// class CudaUnmanagedAllocator
/// does nothing when deallocate(ptr,size) is called
struct CudaUnmanagedUVMAllocator
{
  static const char * name()
  {
    return "Cuda Unmanaged UVM Allocator";
  }

  static void deallocate(void * /*ptr*/, size_t /*size*/) {}

  static bool support_texture_binding() { return true; }
};

/// class CudaUnmanagedHostAllocator
/// does nothing when deallocate(ptr,size) is called
class CudaUnmanagedHostAllocator
{
public:
  static const char * name()
  {
    return "Cuda Unmanaged Host Allocator";
  }
  // Unmanaged deallocate does nothing
  static void deallocate(void * /*ptr*/, size_t /*size*/) {}
};

/// class CudaMallocAllocator
class CudaMallocAllocator
{
public:
  static const char * name()
  {
    return "Cuda Malloc Allocator";
  }

  static void* allocate(size_t size);

  static void deallocate(void * ptr, size_t);

  static void * reallocate(void * old_ptr, size_t old_size, size_t new_size);

  static bool support_texture_binding() { return true; }
};

/// class CudaUVMAllocator
class CudaUVMAllocator
{
public:
  static const char * name()
  {
    return "Cuda UVM Allocator";
  }

  static void* allocate(size_t size);

  static void deallocate(void * ptr, size_t);

  static void * reallocate(void * old_ptr, size_t old_size, size_t new_size);

  static bool support_texture_binding() { return true; }
};

/// class CudaHostAllocator
class CudaHostAllocator
{
public:
  static const char * name()
  {
    return "Cuda Host Allocator";
  }

  static void* allocate(size_t size);

  static void deallocate(void * ptr, size_t);

  static void * reallocate(void * old_ptr, size_t old_size, size_t new_size);
};


}} // namespace Kokkos::Impl

#endif //KOKKOS_ENABLE_CUDA

#endif // #ifndef KOKKOS_CUDA_ALLOCATION_TRACKING_HPP

