diff options
Diffstat (limited to 'compiler/circle-inspect/src/Model.cpp')
-rw-r--r-- | compiler/circle-inspect/src/Model.cpp | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/compiler/circle-inspect/src/Model.cpp b/compiler/circle-inspect/src/Model.cpp new file mode 100644 index 000000000..1924bfafc --- /dev/null +++ b/compiler/circle-inspect/src/Model.cpp @@ -0,0 +1,143 @@ +/* + * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "Model.h" + +#include <fcntl.h> +#include <unistd.h> +#include <sys/stat.h> +#include <sys/mman.h> + +namespace +{ + +class MemoryMappedModel final : public circleinspect::Model +{ +public: + /** + * @require fd and data SHOULD be valid + */ + explicit MemoryMappedModel(int fd, void *data, size_t size) : _fd{fd}, _data{data}, _size{size} + { + // DO NOTHING + } + +public: + ~MemoryMappedModel() + { + munmap(_data, _size); + close(_fd); + } + +public: + MemoryMappedModel(const MemoryMappedModel &) = delete; + MemoryMappedModel(MemoryMappedModel &&) = delete; + +public: + const ::circle::Model *model(void) const override { return ::circle::GetModel(_data); } + +private: + int _fd = -1; + void *_data = nullptr; + size_t _size = 0; +}; + +class FileDescriptor final +{ +public: + FileDescriptor(int value) : _value{value} + { + // DO NOTHING + } + +public: + // NOTE Copy is not allowed + FileDescriptor(const FileDescriptor &) = delete; + +public: + // NOTE Move is allowed + FileDescriptor(FileDescriptor &&fd) { _value = fd.release(); } + +public: + ~FileDescriptor() + { + if (_value != -1) + { + // Close on descturction + close(_value); + } + } + +public: + int value(void) const { return _value; } + +public: + int release(void) + { + auto res = _value; + _value = -1; + return res; + } + +private: + int _value = -1; +}; + +} // namespace + +namespace circleinspect +{ + +std::unique_ptr<Model> load_circle(const std::string &path) +{ + FileDescriptor fd = open(path.c_str(), O_RDONLY); + + if (fd.value() == -1) + { + // Return nullptr on open failure + return nullptr; + } + + struct stat st; + if (fstat(fd.value(), &st) == -1) + { + // Return nullptr on fstat failure + return nullptr; + } + + auto size = st.st_size; + auto data = mmap(nullptr, size, PROT_READ, MAP_SHARED, fd.value(), 0); + + if (data == MAP_FAILED) + { + // Return nullptr on mmap failure + return nullptr; + } + + // Check if file is a valid Flatbuffer file + const uint8_t *u8data = reinterpret_cast<const uint8_t *>(data); + flatbuffers::Verifier verifier{u8data, static_cast<size_t>(size)}; + if (!circle::VerifyModelBuffer(verifier)) + { + munmap(data, size); + close(fd.release()); + return nullptr; + } + + return std::unique_ptr<circleinspect::Model>{new MemoryMappedModel(fd.release(), data, size)}; +} + +} // namespace circleinspect |