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common/dynamic_library: Import and adapt helper from Dolphin

This commit is contained in:
ReinUsesLisp 2020-03-16 17:48:53 -03:00
parent 27f122c48c
commit 7104e01bb3
3 changed files with 183 additions and 0 deletions

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@ -106,6 +106,8 @@ add_library(common STATIC
common_funcs.h common_funcs.h
common_paths.h common_paths.h
common_types.h common_types.h
dynamic_library.cpp
dynamic_library.h
file_util.cpp file_util.cpp
file_util.h file_util.h
hash.h hash.h

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@ -0,0 +1,106 @@
// Copyright 2019 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <cstring>
#include <string>
#include <utility>
#include <fmt/format.h>
#include "common/dynamic_library.h"
#ifdef _WIN32
#include <windows.h>
#else
#include <dlfcn.h>
#endif
namespace Common {
DynamicLibrary::DynamicLibrary() = default;
DynamicLibrary::DynamicLibrary(const char* filename) {
Open(filename);
}
DynamicLibrary::DynamicLibrary(DynamicLibrary&& rhs) noexcept
: handle{std::exchange(rhs.handle, nullptr)} {}
DynamicLibrary& DynamicLibrary::operator=(DynamicLibrary&& rhs) noexcept {
Close();
handle = std::exchange(rhs.handle, nullptr);
return *this;
}
DynamicLibrary::~DynamicLibrary() {
Close();
}
std::string DynamicLibrary::GetUnprefixedFilename(const char* filename) {
#if defined(_WIN32)
return std::string(filename) + ".dll";
#elif defined(__APPLE__)
return std::string(filename) + ".dylib";
#else
return std::string(filename) + ".so";
#endif
}
std::string DynamicLibrary::GetVersionedFilename(const char* libname, int major, int minor) {
#if defined(_WIN32)
if (major >= 0 && minor >= 0)
return fmt::format("{}-{}-{}.dll", libname, major, minor);
else if (major >= 0)
return fmt::format("{}-{}.dll", libname, major);
else
return fmt::format("{}.dll", libname);
#elif defined(__APPLE__)
const char* prefix = std::strncmp(libname, "lib", 3) ? "lib" : "";
if (major >= 0 && minor >= 0)
return fmt::format("{}{}.{}.{}.dylib", prefix, libname, major, minor);
else if (major >= 0)
return fmt::format("{}{}.{}.dylib", prefix, libname, major);
else
return fmt::format("{}{}.dylib", prefix, libname);
#else
const char* prefix = std::strncmp(libname, "lib", 3) ? "lib" : "";
if (major >= 0 && minor >= 0)
return fmt::format("{}{}.so.{}.{}", prefix, libname, major, minor);
else if (major >= 0)
return fmt::format("{}{}.so.{}", prefix, libname, major);
else
return fmt::format("{}{}.so", prefix, libname);
#endif
}
bool DynamicLibrary::Open(const char* filename) {
#ifdef _WIN32
handle = reinterpret_cast<void*>(LoadLibraryA(filename));
#else
handle = dlopen(filename, RTLD_NOW);
#endif
return handle != nullptr;
}
void DynamicLibrary::Close() {
if (!IsOpen())
return;
#ifdef _WIN32
FreeLibrary(reinterpret_cast<HMODULE>(handle));
#else
dlclose(handle);
#endif
handle = nullptr;
}
void* DynamicLibrary::GetSymbolAddress(const char* name) const {
#ifdef _WIN32
return reinterpret_cast<void*>(GetProcAddress(reinterpret_cast<HMODULE>(handle), name));
#else
return reinterpret_cast<void*>(dlsym(handle, name));
#endif
}
} // namespace Common

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@ -0,0 +1,75 @@
// Copyright 2019 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#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.
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
static std::string GetVersionedFilename(const char* libname, int major = -1, int minor = -1);
/// Returns true if a module is loaded, otherwise false.
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.
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.
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>
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