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//
// Copyright © 2021 Arm Ltd and Contributors. All rights reserved.
// SPDX-License-Identifier: MIT
//
#pragma once
#include <cstddef>
#include <memory>
#include <armnn/MemorySources.hpp>
#include <armnn/utility/IgnoreUnused.hpp>
namespace armnn
{
/** Custom Allocator interface */
class ICustomAllocator
{
public:
/** Default virtual destructor. */
virtual ~ICustomAllocator() = default;
/** Interface to be implemented by the child class to allocate bytes
*
* @param[in] size Size to allocate
* @param[in] alignment Alignment that the returned pointer should comply with
*
* @return A pointer to the allocated memory
* The returned pointer must be host write accessible
*/
virtual void* allocate(size_t size, size_t alignment) = 0;
/** Interface to be implemented by the child class to free the allocated bytes */
virtual void free(void* ptr) = 0;
/** Used to specify what type of memory is being allocated by this allocator.
* Supported types are:
* MemorySource::Malloc
* MemorySource::DmaBuf
* MemorySource::DmaBufProtected
*/
virtual armnn::MemorySource GetMemorySourceType() = 0;
/** Interface that may be implemented to allow retrieval of Memory Region
* from allocated buffer at a certain offset
*/
virtual void* GetMemoryRegionAtOffset(void* buffer, size_t offset, size_t alignment = 0)
{
IgnoreUnused(offset);
IgnoreUnused(alignment);
IgnoreUnused(buffer);
throw armnn::Exception(
"ICustomerAllocator::GetMemoryRegionAtOffset(): This function should be overridden in subclass.");
}
};
} // namespace armnn
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