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/*
* Copyright (c) 2016-2019 Arm Limited.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef ARM_COMPUTE_TENSORALLOCATOR_H
#define ARM_COMPUTE_TENSORALLOCATOR_H
#include "arm_compute/runtime/ITensorAllocator.h"
#include "arm_compute/runtime/Memory.h"
#include "arm_compute/runtime/MemoryGroup.h"
#include <cstdint>
#include <memory>
#include <vector>
namespace arm_compute
{
// Forward declaration
class Coordinates;
class TensorInfo;
/** Basic implementation of a CPU memory tensor allocator. */
class TensorAllocator : public ITensorAllocator
{
public:
/** Default constructor.
*
* @param[in] owner Memory manageable owner
*/
TensorAllocator(IMemoryManageable *owner);
/** Default destructor */
~TensorAllocator();
/** Prevent instances of this class from being copied (As this class contains pointers) */
TensorAllocator(const TensorAllocator &) = delete;
/** Prevent instances of this class from being copy assigned (As this class contains pointers) */
TensorAllocator &operator=(const TensorAllocator &) = delete;
/** Allow instances of this class to be moved */
TensorAllocator(TensorAllocator &&) noexcept;
/** Allow instances of this class to be moved */
TensorAllocator &operator=(TensorAllocator &&) noexcept;
/** Make ITensorAllocator's init methods available */
using ITensorAllocator::init;
/** Shares the same backing memory with another tensor allocator, while the tensor info might be different.
* In other words this can be used to create a sub-tensor from another tensor while sharing the same memory.
*
* @note TensorAllocator have to be of the same specialized type.
*
* @param[in] allocator The allocator that owns the backing memory to be shared. Ownership becomes shared afterwards.
* @param[in] coords The starting coordinates of the new tensor inside the parent tensor.
* @param[in] sub_info The new tensor information (e.g. shape etc)
*/
void init(const TensorAllocator &allocator, const Coordinates &coords, TensorInfo &sub_info);
/** Returns the pointer to the allocated data.
*
* @return a pointer to the allocated data.
*/
uint8_t *data() const;
/** Allocate size specified by TensorInfo of CPU memory.
*
* @note The tensor must not already be allocated when calling this function.
*
*/
void allocate() override;
/** Free allocated CPU memory.
*
* @note The tensor must have been allocated when calling this function.
*
*/
void free() override;
/** Import an existing memory as a tensor's backing memory
*
* @warning size is expected to be compliant with total_size reported by ITensorInfo.
* @warning ownership of memory is not transferred.
* @warning tensor shouldn't be memory managed.
* @warning padding should be accounted by the client code.
* @warning memory must be writable in case of in-place operations
* @note buffer alignment will be checked to be compliant with alignment reported by ITensorInfo.
*
* @param[in] memory Raw memory pointer to be used as backing memory
*
* @return An error status
*/
Status import_memory(void *memory);
/** Associates the tensor with a memory group
*
* @param[in] associated_memory_group Memory group to associate the tensor with
*/
void set_associated_memory_group(IMemoryGroup *associated_memory_group);
protected:
/** No-op for CPU memory
*
* @return A pointer to the beginning of the tensor's allocation.
*/
uint8_t *lock() override;
/** No-op for CPU memory. */
void unlock() override;
private:
IMemoryManageable *_owner; /**< Memory manageable object that owns the allocator */
IMemoryGroup *_associated_memory_group; /**< Registered memory manager */
Memory _memory; /**< CPU memory */
};
} // namespace arm_compute
#endif /* ARM_COMPUTE_TENSORALLOCATOR_H */
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