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// SPDX-FileCopyrightText: 2019 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <string>
namespace Common {
/**
* Provides a platform-independent interface for loading a dynamic library and retrieving symbols.
* The interface maintains an internal reference count to allow one handle to be shared between
* multiple users.
*/
class DynamicLibrary final {
public:
/// Default constructor, does not load a library.
explicit DynamicLibrary();
/// Automatically loads the specified library. Call IsOpen() to check validity before use.
explicit DynamicLibrary(const char* filename);
/// Moves the library.
DynamicLibrary(DynamicLibrary&&) noexcept;
DynamicLibrary& operator=(DynamicLibrary&&) noexcept;
/// Delete copies, we can't copy a dynamic library.
DynamicLibrary(const DynamicLibrary&) = delete;
DynamicLibrary& operator=(const DynamicLibrary&) = delete;
/// Closes the library.
~DynamicLibrary();
/// Returns the specified library name with the platform-specific suffix added.
[[nodiscard]] static std::string GetUnprefixedFilename(const char* filename);
/// Returns the specified library name in platform-specific format.
/// Major/minor versions will not be included if set to -1.
/// If libname already contains the "lib" prefix, it will not be added again.
/// Windows: LIBNAME-MAJOR-MINOR.dll
/// Linux: libLIBNAME.so.MAJOR.MINOR
/// Mac: libLIBNAME.MAJOR.MINOR.dylib
[[nodiscard]] static std::string GetVersionedFilename(const char* libname, int major = -1,
int minor = -1);
/// Returns true if a module is loaded, otherwise false.
[[nodiscard]] bool IsOpen() const {
return handle != nullptr;
}
/// Loads (or replaces) the handle with the specified library file name.
/// Returns true if the library was loaded and can be used.
[[nodiscard]] bool Open(const char* filename);
/// Unloads the library, any function pointers from this library are no longer valid.
void Close();
/// Returns the address of the specified symbol (function or variable) as an untyped pointer.
/// If the specified symbol does not exist in this library, nullptr is returned.
[[nodiscard]] void* GetSymbolAddress(const char* name) const;
/// Obtains the address of the specified symbol, automatically casting to the correct type.
/// Returns true if the symbol was found and assigned, otherwise false.
template <typename T>
[[nodiscard]] bool GetSymbol(const char* name, T* ptr) const {
*ptr = reinterpret_cast<T>(GetSymbolAddress(name));
return *ptr != nullptr;
}
private:
/// Platform-dependent data type representing a dynamic library handle.
void* handle = nullptr;
};
} // namespace Common
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