DeviceAdapterMemoryManager.h

Go to the documentation of this file.

//============================================================================
//  Copyright (c) Kitware, Inc.
//  All rights reserved.
//  See LICENSE.txt for details.
//
//  This software is distributed WITHOUT ANY WARRANTY; without even
//  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
//  PURPOSE.  See the above copyright notice for more information.
//============================================================================
#ifndef vtk_m_cont_internal_DeviceAdapterMemoryManager_h
#define vtk_m_cont_internal_DeviceAdapterMemoryManager_h
 
#include <vtkm/cont/vtkm_cont_export.h>
 
#include <vtkm/Flags.h>
#include <vtkm/Types.h>
 
#include <vtkm/cont/DeviceAdapterTag.h>
 
#include <cstring>
#include <memory>
#include <vector>
 
namespace vtkm
{
 
using BufferSizeType = vtkm::Int64;
 
namespace cont
{
namespace internal
{
 
struct TransferredBuffer;
 
namespace detail
{
 
struct BufferInfoInternals;
 
} // namespace detail
 
class VTKM_CONT_EXPORT BufferInfo
{
public:
  VTKM_CONT void* GetPointer() const;
 
  VTKM_CONT vtkm::BufferSizeType GetSize() const;
 
  VTKM_CONT vtkm::cont::DeviceAdapterId GetDevice() const;
 
  VTKM_CONT BufferInfo();
  VTKM_CONT ~BufferInfo();
 
  VTKM_CONT BufferInfo(const BufferInfo& src);
  VTKM_CONT BufferInfo(BufferInfo&& src);
 
  VTKM_CONT BufferInfo& operator=(const BufferInfo& src);
  VTKM_CONT BufferInfo& operator=(BufferInfo&& src);
 
  VTKM_CONT BufferInfo(const BufferInfo& src, vtkm::cont::DeviceAdapterId device);
  VTKM_CONT BufferInfo(BufferInfo&& src, vtkm::cont::DeviceAdapterId device);
 
  using Deleter = void(void* container);
 
  using Reallocater = void(void*& memory,
                           void*& container,
                           vtkm::BufferSizeType oldSize,
                           vtkm::BufferSizeType newSize);
 
  VTKM_CONT BufferInfo(vtkm::cont::DeviceAdapterId device,
                       void* memory,
                       void* container,
                       vtkm::BufferSizeType size,
                       Deleter deleter,
                       Reallocater reallocater);
 
  VTKM_CONT void Reallocate(vtkm::BufferSizeType newSize);
 
  VTKM_CONT TransferredBuffer TransferOwnership();
 
private:
  detail::BufferInfoInternals* Internals;
  vtkm::cont::DeviceAdapterId Device;
};
 
 
struct TransferredBuffer
{
  void* Memory;
  void* Container;
  BufferInfo::Deleter* Delete;
  BufferInfo::Reallocater* Reallocate;
  vtkm::BufferSizeType Size;
};
 
VTKM_CONT_EXPORT VTKM_CONT vtkm::cont::internal::BufferInfo AllocateOnHost(
  vtkm::BufferSizeType size);
 
class VTKM_CONT_EXPORT DeviceAdapterMemoryManagerBase
{
public:
  VTKM_CONT virtual ~DeviceAdapterMemoryManagerBase();
 
  VTKM_CONT virtual vtkm::cont::internal::BufferInfo Allocate(vtkm::BufferSizeType size) const = 0;
 
  VTKM_CONT void Reallocate(vtkm::cont::internal::BufferInfo& buffer,
                            vtkm::BufferSizeType newSize) const;
 
  VTKM_CONT BufferInfo ManageArray(void* memory,
                                   void* container,
                                   vtkm::BufferSizeType size,
                                   vtkm::cont::internal::BufferInfo::Deleter deleter,
                                   vtkm::cont::internal::BufferInfo::Reallocater reallocater) const;
 
  VTKM_CONT virtual vtkm::cont::DeviceAdapterId GetDevice() const = 0;
 
  VTKM_CONT virtual vtkm::cont::internal::BufferInfo CopyHostToDevice(
    const vtkm::cont::internal::BufferInfo& src) const = 0;
 
  VTKM_CONT virtual void CopyHostToDevice(const vtkm::cont::internal::BufferInfo& src,
                                          const vtkm::cont::internal::BufferInfo& dest) const = 0;
 
  VTKM_CONT virtual vtkm::cont::internal::BufferInfo CopyDeviceToHost(
    const vtkm::cont::internal::BufferInfo& src) const = 0;
 
  VTKM_CONT virtual void CopyDeviceToHost(const vtkm::cont::internal::BufferInfo& src,
                                          const vtkm::cont::internal::BufferInfo& dest) const = 0;
 
  VTKM_CONT virtual vtkm::cont::internal::BufferInfo CopyDeviceToDevice(
    const vtkm::cont::internal::BufferInfo& src) const = 0;
 
  VTKM_CONT virtual void CopyDeviceToDevice(const vtkm::cont::internal::BufferInfo& src,
                                            const vtkm::cont::internal::BufferInfo& dest) const = 0;
};
 
template <typename DeviceAdapterTag>
class DeviceAdapterMemoryManager;
 
VTKM_CONT_EXPORT VTKM_CONT void InvalidRealloc(void*&,
                                               void*&,
                                               vtkm::BufferSizeType,
                                               vtkm::BufferSizeType);
 
// Deletes a container object by casting it to a pointer of a given type (the template argument)
// and then using delete[] on the object.
template <typename T>
VTKM_CONT inline void SimpleArrayDeleter(void* container_)
{
  T* container = reinterpret_cast<T*>(container_);
  delete[] container;
}
 
// Reallocates a standard C array. Note that the allocation method is different than the default
// host allocation of vtkm::cont::internal::BufferInfo and may be less efficient.
template <typename T>
VTKM_CONT inline void SimpleArrayReallocater(void*& memory,
                                             void*& container,
                                             vtkm::BufferSizeType oldSize,
                                             vtkm::BufferSizeType newSize)
{
  VTKM_ASSERT(memory == container);
  VTKM_ASSERT(static_cast<std::size_t>(newSize) % sizeof(T) == 0);
 
  // If the new size is not much smaller than the old size, just reuse the buffer (and waste a
  // little memory).
  if ((newSize > ((3 * oldSize) / 4)) && (newSize <= oldSize))
  {
    return;
  }
 
  void* newBuffer = new T[static_cast<std::size_t>(newSize) / sizeof(T)];
  std::memcpy(newBuffer, memory, static_cast<std::size_t>(newSize < oldSize ? newSize : oldSize));
 
  if (memory != nullptr)
  {
    SimpleArrayDeleter<T>(memory);
  }
 
  memory = container = newBuffer;
}
 
// Deletes a container object by casting it to a pointer of a given type (the template argument)
// and then using delete on the object.
template <typename T>
VTKM_CONT inline void CastDeleter(void* container_)
{
  T* container = reinterpret_cast<T*>(container_);
  delete container;
}
 
template <typename T, typename Allocator>
VTKM_CONT inline void StdVectorDeleter(void* container)
{
  CastDeleter<std::vector<T, Allocator>>(container);
}
 
template <typename T, typename Allocator>
VTKM_CONT inline void StdVectorReallocater(void*& memory,
                                           void*& container,
                                           vtkm::BufferSizeType oldSize,
                                           vtkm::BufferSizeType newSize)
{
  using vector_type = std::vector<T, Allocator>;
  vector_type* vector = reinterpret_cast<vector_type*>(container);
  VTKM_ASSERT(vector->empty() || (memory == vector->data()));
  VTKM_ASSERT(oldSize == static_cast<vtkm::BufferSizeType>(vector->size() * sizeof(T)));
 
  vector->resize(static_cast<std::size_t>(newSize));
  memory = vector->data();
}
}
}
} // namespace vtkm::cont::internal
 
#endif //vtk_m_cont_internal_DeviceAdapterMemoryManager_h