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Support loading CasADi problems directly (without depending on the Ca…
…sADi C++ library)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| #pragma once | ||
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| #include <alpaqa/export.h> | ||
| #include <filesystem> | ||
| #include <memory> | ||
| #include <stdexcept> | ||
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| namespace alpaqa ::util { | ||
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| /// Failed to load a DLL or SO file, or failed to access a function in it. | ||
| struct ALPAQA_EXPORT dynamic_load_error : std::runtime_error { | ||
| using std::runtime_error::runtime_error; | ||
| }; | ||
|
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| /// Load a DLL or SO file. | ||
| ALPAQA_EXPORT std::shared_ptr<void> | ||
| load_lib(const std::filesystem::path &so_filename); | ||
| /// Get a pointer to a function inside of a loaded DLL or SO file. | ||
| ALPAQA_EXPORT void *load_func(void *lib_handle, const std::string &name); | ||
|
|
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| } // namespace alpaqa::util |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| #include <alpaqa/util/dl.hpp> | ||
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| #if _WIN32 | ||
| #include <windows.h> | ||
| #else | ||
| #include <dlfcn.h> | ||
| #endif | ||
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| #include <cassert> | ||
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| namespace alpaqa::util { | ||
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| #if _WIN32 | ||
| std::shared_ptr<char> get_last_error_msg() { | ||
| char *err = nullptr; | ||
| auto opt = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | | ||
| FORMAT_MESSAGE_IGNORE_INSERTS; | ||
| auto lang = MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT); | ||
| if (FormatMessage(opt, NULL, GetLastError(), lang, | ||
| reinterpret_cast<char *>(&err), 0, NULL) != 0) { | ||
| return std::shared_ptr<char>{err, [](char *e) { LocalFree(e); }}; | ||
| } else { | ||
| static char msg[] = "(failed to get error message)"; | ||
| return std::shared_ptr<char>{msg, [](char *) {}}; | ||
| } | ||
| } | ||
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| std::shared_ptr<void> load_lib(const std::filesystem::path &so_filename) { | ||
| assert(!so_filename.empty()); | ||
| void *h = LoadLibraryW(so_filename.c_str()); | ||
| if (!h) | ||
| throw dynamic_load_error("Unable to load \"" + so_filename.string() + | ||
| "\": " + get_last_error_msg().get()); | ||
| #if ALPAQA_NO_DLCLOSE | ||
| return std::shared_ptr<void>{h, +[](void *) {}}; | ||
| #else | ||
| return std::shared_ptr<void>{ | ||
| h, +[](void *h) { FreeLibrary(static_cast<HMODULE>(h)); }}; | ||
| #endif | ||
| } | ||
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| void *load_func(void *handle, const std::string &name) { | ||
| assert(handle); | ||
| auto *h = GetProcAddress(static_cast<HMODULE>(handle), name.c_str()); | ||
| if (!h) | ||
| throw dynamic_load_error("Unable to load function '" + name + | ||
| "': " + get_last_error_msg().get()); | ||
| return reinterpret_cast<void *>(h); | ||
| } | ||
| #else | ||
| std::shared_ptr<void> load_lib(const std::filesystem::path &so_filename) { | ||
| assert(!so_filename.empty()); | ||
| ::dlerror(); | ||
| void *h = ::dlopen(so_filename.c_str(), RTLD_LOCAL | RTLD_NOW); | ||
| if (auto *err = ::dlerror()) | ||
| throw dynamic_load_error(err); | ||
| #if ALPAQA_NO_DLCLOSE | ||
| return std::shared_ptr<void>{h, +[](void *) {}}; | ||
| #else | ||
| return std::shared_ptr<void>{h, &::dlclose}; | ||
| #endif | ||
| } | ||
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| void *load_func(void *handle, const std::string &name) { | ||
| assert(handle); | ||
| ::dlerror(); | ||
| auto *h = ::dlsym(handle, name.c_str()); | ||
| if (auto *err = ::dlerror()) | ||
| throw dynamic_load_error("Unable to load function '" + name + | ||
| "': " + err); | ||
| return h; | ||
| } | ||
| #endif | ||
|
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| } // namespace alpaqa::util |
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