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#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;
}
};
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