#pragma once #include "defaults.h" #include <util/generic/ptr.h> #include <util/generic/string.h> #define Y_GET_FUNC(dll, name) FUNC_##name((dll).Sym(#name)) #define Y_GET_FUNC_OPTIONAL(dll, name) FUNC_##name((dll).SymOptional(#name)) #ifdef _win32_ #define DEFAULT_DLLOPEN_FLAGS 0 #else #include <dlfcn.h> #ifndef RTLD_GLOBAL #define RTLD_GLOBAL (0) #endif #define DEFAULT_DLLOPEN_FLAGS (RTLD_NOW | RTLD_GLOBAL) #endif class TDynamicLibrary { public: TDynamicLibrary() noexcept; TDynamicLibrary(const TString& path, int flags = DEFAULT_DLLOPEN_FLAGS); ~TDynamicLibrary(); void Open(const char* path, int flags = DEFAULT_DLLOPEN_FLAGS); void Close() noexcept; void* SymOptional(const char* name) noexcept; void* Sym(const char* name); bool IsLoaded() const noexcept; void SetUnloadable(bool unloadable); // Set to false to avoid unloading on destructor private: class TImpl; THolder<TImpl> Impl_; }; // a wrapper for a symbol template <class TLib> class TExternalSymbol { private: TLib* PLib; TDynamicLibrary* DLib; TString lname; TString vname; public: TExternalSymbol() noexcept { PLib = nullptr; DLib = nullptr; } TExternalSymbol(const TExternalSymbol& es) { PLib = nullptr; DLib = nullptr; if (es.IsDynamic()) Open(es.LibName().data(), es.VtblName().data()); else if (es.IsStatic()) SetSym(es.Symbol()); } TExternalSymbol& operator=(const TExternalSymbol& es) { if (this != &es) { Close(); if (es.IsDynamic()) Open(es.LibName().data(), es.VtblName().data()); else if (es.IsStatic()) SetSym(es.Symbol()); } return *this; } ~TExternalSymbol() { delete DLib; } // set the symbol from dynamic source void Open(const char* lib_name, const char* vtbl_name) { if (DLib != nullptr || PLib != nullptr) return; try { DLib = new TDynamicLibrary(); DLib->Open(lib_name); PLib = (TLib*)DLib->Sym(vtbl_name); } catch (...) { delete DLib; DLib = nullptr; throw; } lname = lib_name; vname = vtbl_name; } // set the symbol from static source void SetSym(TLib* pl) noexcept { if (DLib == nullptr && PLib == nullptr) PLib = pl; } void Close() noexcept { delete DLib; DLib = 0; PLib = 0; lname.remove(); vname.remove(); } TLib* Symbol() const noexcept { return PLib; } const TString& LibName() const noexcept { return lname; } const TString& VtblName() const noexcept { return vname; } bool IsStatic() const noexcept { return DLib == nullptr && PLib != nullptr; } bool IsDynamic() const noexcept { return DLib && DLib->IsLoaded() && PLib != nullptr; } };