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Diffstat (limited to 'src/lib/util/mfpresolve.h')
-rw-r--r-- | src/lib/util/mfpresolve.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/src/lib/util/mfpresolve.h b/src/lib/util/mfpresolve.h new file mode 100644 index 00000000000..c9a2eba6a95 --- /dev/null +++ b/src/lib/util/mfpresolve.h @@ -0,0 +1,86 @@ +// license:BSD-3-Clause +// copyright-holders:Vas Crabb +/*************************************************************************** + + mfpresolve.h + + Helpers for resolving member function pointers to entry points. + +***************************************************************************/ +#ifndef MAME_LIB_UTIL_MFPRESOLVE_H +#define MAME_LIB_UTIL_MFPRESOLVE_H + +#pragma once + +#include "abi.h" + +#include <cassert> +#include <cstdint> +#include <utility> + + +namespace util { + +namespace detail { + +std::pair<std::uintptr_t, std::uintptr_t> resolve_member_function_itanium(std::uintptr_t function, std::ptrdiff_t delta, void const *object) noexcept; +std::pair<std::uintptr_t, std::uintptr_t> resolve_member_function_msvc(void const *funcptr, std::size_t size, void const *object) noexcept; +std::uintptr_t bypass_member_function_thunks(std::uintptr_t entrypoint, void const *object) noexcept; + +} // namespace detail + + +template <typename T, typename U> +inline T bypass_member_function_thunks(T entrypoint, U const *object) noexcept +{ + return reinterpret_cast<T>( + detail::bypass_member_function_thunks( + reinterpret_cast<std::uintptr_t>(entrypoint), + reinterpret_cast<void const *>(object))); +} + + +template <typename T, typename Ret, typename... Params> +inline std::pair<std::uintptr_t, std::uintptr_t> resolve_member_function(Ret (T::*function)(Params...), T *object) noexcept +{ + if (MAME_ABI_CXX_TYPE == MAME_ABI_CXX_ITANIUM) + { + struct { uintptr_t ptr; ptrdiff_t adj; } equiv; + static_assert(sizeof(function) == sizeof(equiv)); + *reinterpret_cast<decltype(function) *>(&equiv) = function; + return detail::resolve_member_function_itanium(equiv.ptr, equiv.adj, object); + } + else if (MAME_ABI_CXX_TYPE == MAME_ABI_CXX_MSVC) + { + return detail::resolve_member_function_msvc(&function, sizeof(function), object); + } + else + { + return std::make_pair(std::uintptr_t(nullptr), std::uintptr_t(nullptr)); + } +} + + +template <typename T, typename Ret, typename... Params> +inline std::pair<std::uintptr_t, std::uintptr_t> resolve_member_function(Ret (T::*function)(Params...) const, T const *object) noexcept +{ + if (MAME_ABI_CXX_TYPE == MAME_ABI_CXX_ITANIUM) + { + struct { uintptr_t ptr; ptrdiff_t adj; } equiv; + static_assert(sizeof(function) == sizeof(equiv)); + *reinterpret_cast<decltype(function) *>(&equiv) = function; + return detail::resolve_member_function_itanium(equiv.ptr, equiv.adj, object); + } + else if (MAME_ABI_CXX_TYPE == MAME_ABI_CXX_MSVC) + { + return detail::resolve_member_function_msvc(&function, sizeof(function), object); + } + else + { + return std::make_pair(std::uintptr_t(nullptr), std::uintptr_t(nullptr)); + } +} + +} // namespace util + +#endif // MAME_LIB_UTIL_MFPRESOLVE_H |