111 lines
3.6 KiB
C++
111 lines
3.6 KiB
C++
/*
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* Copyright (c) 2018-2020 Arm Limited.
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef ARM_COMPUTE_RUNTIME_MEMORY_REGION_H
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#define ARM_COMPUTE_RUNTIME_MEMORY_REGION_H
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#include "arm_compute/runtime/IMemoryRegion.h"
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#include "arm_compute/core/Error.h"
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#include "support/MemorySupport.h"
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#include <cstddef>
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namespace arm_compute
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{
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/** Memory region CPU implementation */
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class MemoryRegion final : public IMemoryRegion
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{
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public:
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/** Constructor
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*
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* @param[in] size Region size
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* @param[in] alignment Alignment in bytes of the base pointer. Defaults to 0
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*/
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MemoryRegion(size_t size, size_t alignment = 0)
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: IMemoryRegion(size), _mem(nullptr), _ptr(nullptr)
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{
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if(size != 0)
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{
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// Allocate backing memory
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size_t space = size + alignment;
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_mem = std::shared_ptr<uint8_t>(new uint8_t[space](), [](uint8_t *ptr)
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{
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delete[] ptr;
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});
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_ptr = _mem.get();
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// Calculate alignment offset
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if(alignment != 0)
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{
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void *aligned_ptr = _mem.get();
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support::cpp11::align(alignment, size, aligned_ptr, space);
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_ptr = aligned_ptr;
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}
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}
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}
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MemoryRegion(void *ptr, size_t size)
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: IMemoryRegion(size), _mem(nullptr), _ptr(nullptr)
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{
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if(size != 0)
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{
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_ptr = ptr;
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}
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}
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/** Prevent instances of this class from being copied (As this class contains pointers) */
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MemoryRegion(const MemoryRegion &) = delete;
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/** Default move constructor */
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MemoryRegion(MemoryRegion &&) = default;
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/** Prevent instances of this class from being copied (As this class contains pointers) */
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MemoryRegion &operator=(const MemoryRegion &) = delete;
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/** Default move assignment operator */
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MemoryRegion &operator=(MemoryRegion &&) = default;
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// Inherited methods overridden :
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void *buffer() final
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{
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return _ptr;
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}
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const void *buffer() const final
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{
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return _ptr;
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}
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std::unique_ptr<IMemoryRegion> extract_subregion(size_t offset, size_t size) final
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{
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if(_ptr != nullptr && (offset < _size) && (_size - offset >= size))
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{
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return support::cpp14::make_unique<MemoryRegion>(static_cast<uint8_t *>(_ptr) + offset, size);
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}
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else
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{
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return nullptr;
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}
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}
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protected:
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std::shared_ptr<uint8_t> _mem;
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void *_ptr;
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};
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} // namespace arm_compute
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#endif /* ARM_COMPUTE_RUNTIME_MEMORY_REGION_H */
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