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| // Copyright 2010-2022 Google LLC | ||
| // 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. | ||
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| #ifndef OR_TOOLS_BASE_DYNAMIC_LIBRARY_H_ | ||
| #define OR_TOOLS_BASE_DYNAMIC_LIBRARY_H_ | ||
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| #include <functional> | ||
| #include <stdexcept> | ||
| #include <string> | ||
| #include <vector> | ||
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| #if defined(_MSC_VER) | ||
| #define WIN32_LEAN_AND_MEAN // disables several conflicting macros | ||
| #include <windows.h> | ||
| #elif defined(__GNUC__) | ||
| #include <dlfcn.h> | ||
| #endif | ||
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| class DynamicLibrary { | ||
| static constexpr size_t kMaxFunctionsNotFound = 10; | ||
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| public: | ||
| DynamicLibrary() : library_handle_(nullptr) {} | ||
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| ~DynamicLibrary() { | ||
| if (library_handle_ == nullptr) { | ||
| return; | ||
| } | ||
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| #if defined(_MSC_VER) | ||
| FreeLibrary(static_cast<HINSTANCE>(library_handle_)); | ||
| #elif defined(__GNUC__) | ||
| dlclose(library_handle_); | ||
| #endif | ||
| } | ||
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| bool TryToLoad(const std::string& library_name) { | ||
| library_name_ = std::string(library_name); | ||
| #if defined(_MSC_VER) | ||
| library_handle_ = static_cast<void*>(LoadLibraryA(library_name.c_str())); | ||
| #elif defined(__GNUC__) | ||
| library_handle_ = dlopen(library_name.c_str(), RTLD_NOW); | ||
| #endif | ||
| return library_handle_ != nullptr; | ||
| } | ||
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| bool LibraryIsLoaded() const { return library_handle_ != nullptr; } | ||
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| const std::vector<std::string>& FunctionsNotFound() const { | ||
| return functions_not_found_; | ||
| } | ||
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| template <typename T> | ||
| std::function<T> GetFunction(const char* function_name) { | ||
| const void* function_address = | ||
| #if defined(_MSC_VER) | ||
| static_cast<void*>(GetProcAddress( | ||
| static_cast<HINSTANCE>(library_handle_), function_name)); | ||
| #else | ||
| dlsym(library_handle_, function_name); | ||
| #endif | ||
| // We don't really need the full list of missing functions, | ||
| // just a few are enough. | ||
| if (!function_address && | ||
| functions_not_found_.size() < kMaxFunctionsNotFound) | ||
| functions_not_found_.push_back(function_name); | ||
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| return TypeParser<T>::CreateFunction(function_address); | ||
| } | ||
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| template <typename T> | ||
| std::function<T> GetFunction(const std::string& function_name) { | ||
| return GetFunction<T>(function_name.c_str()); | ||
| } | ||
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| template <typename T> | ||
| void GetFunction(std::function<T>* function, const char* function_name) { | ||
| *function = GetFunction<T>(function_name); | ||
| } | ||
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| template <typename T> | ||
| void GetFunction(std::function<T>* function, | ||
| const std::string function_name) { | ||
| GetFunction<T>(function, function_name.c_str()); | ||
| } | ||
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| private: | ||
| void* library_handle_ = nullptr; | ||
| std::string library_name_; | ||
| std::vector<std::string> functions_not_found_; | ||
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| template <typename T> | ||
| struct TypeParser {}; | ||
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| template <typename Ret, typename... Args> | ||
| struct TypeParser<Ret(Args...)> { | ||
| static std::function<Ret(Args...)> CreateFunction( | ||
| const void* function_address) { | ||
| return std::function<Ret(Args...)>(reinterpret_cast<Ret (*)(Args...)>( | ||
| const_cast<void*>(function_address))); | ||
| } | ||
| }; | ||
| }; | ||
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| #endif // OR_TOOLS_BASE_DYNAMIC_LIBRARY_H_ |
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