1 /* 2 * Copyright (c) 2018-2020 Arm Limited. 3 * 4 * SPDX-License-Identifier: MIT 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to 8 * deal in the Software without restriction, including without limitation the 9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in all 14 * copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22 * SOFTWARE. 23 */ 24 #ifndef ARM_COMPUTE_RUNTIME_MEMORY_REGION_H 25 #define ARM_COMPUTE_RUNTIME_MEMORY_REGION_H 26 27 #include "arm_compute/runtime/IMemoryRegion.h" 28 29 #include "arm_compute/core/Error.h" 30 31 #include <cstddef> 32 33 namespace arm_compute 34 { 35 /** Memory region CPU implementation */ 36 class MemoryRegion final : public IMemoryRegion 37 { 38 public: 39 /** Constructor 40 * 41 * @param[in] size Region size 42 * @param[in] alignment Alignment in bytes of the base pointer. Defaults to 0 43 */ 44 MemoryRegion(size_t size, size_t alignment = 0) IMemoryRegion(size)45 : IMemoryRegion(size), _mem(nullptr), _ptr(nullptr) 46 { 47 if(size != 0) 48 { 49 // Allocate backing memory 50 size_t space = size + alignment; 51 _mem = std::shared_ptr<uint8_t>(new uint8_t[space](), [](uint8_t *ptr) 52 { 53 delete[] ptr; 54 }); 55 _ptr = _mem.get(); 56 57 // Calculate alignment offset 58 if(alignment != 0) 59 { 60 void *aligned_ptr = _mem.get(); 61 std::align(alignment, size, aligned_ptr, space); 62 _ptr = aligned_ptr; 63 } 64 } 65 } MemoryRegion(void * ptr,size_t size)66 MemoryRegion(void *ptr, size_t size) 67 : IMemoryRegion(size), _mem(nullptr), _ptr(nullptr) 68 { 69 if(size != 0) 70 { 71 _ptr = ptr; 72 } 73 } 74 /** Prevent instances of this class from being copied (As this class contains pointers) */ 75 MemoryRegion(const MemoryRegion &) = delete; 76 /** Default move constructor */ 77 MemoryRegion(MemoryRegion &&) = default; 78 /** Prevent instances of this class from being copied (As this class contains pointers) */ 79 MemoryRegion &operator=(const MemoryRegion &) = delete; 80 /** Default move assignment operator */ 81 MemoryRegion &operator=(MemoryRegion &&) = default; 82 83 // Inherited methods overridden : buffer()84 void *buffer() final 85 { 86 return _ptr; 87 } buffer()88 const void *buffer() const final 89 { 90 return _ptr; 91 } extract_subregion(size_t offset,size_t size)92 std::unique_ptr<IMemoryRegion> extract_subregion(size_t offset, size_t size) final 93 { 94 if(_ptr != nullptr && (offset < _size) && (_size - offset >= size)) 95 { 96 return std::make_unique<MemoryRegion>(static_cast<uint8_t *>(_ptr) + offset, size); 97 } 98 else 99 { 100 return nullptr; 101 } 102 } 103 104 protected: 105 std::shared_ptr<uint8_t> _mem; 106 void *_ptr; 107 }; 108 } // namespace arm_compute 109 #endif /* ARM_COMPUTE_RUNTIME_MEMORY_REGION_H */ 110