boost/type_index/detail/compile_time_type_info.hpp
// // Copyright (c) Antony Polukhin, 2012-2018. // // // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // #ifndef BOOST_TYPE_INDEX_DETAIL_COMPILE_TIME_TYPE_INFO_HPP #define BOOST_TYPE_INDEX_DETAIL_COMPILE_TIME_TYPE_INFO_HPP /// \file compile_time_type_info.hpp /// \brief Contains helper macros and implementation details of boost::typeindex::ctti_type_index. /// Not intended for inclusion from user's code. #include <boost/config.hpp> #include <boost/static_assert.hpp> #include <boost/type_traits/integral_constant.hpp> #ifdef BOOST_HAS_PRAGMA_ONCE # pragma once #endif /// @cond #define BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS(begin_skip, end_skip, runtime_skip, runtime_skip_until) \ namespace boost { namespace typeindex { namespace detail { \ BOOST_STATIC_CONSTEXPR std::size_t ctti_skip_size_at_begin = begin_skip; \ BOOST_STATIC_CONSTEXPR std::size_t ctti_skip_size_at_end = end_skip; \ BOOST_STATIC_CONSTEXPR bool ctti_skip_more_at_runtime = runtime_skip; \ BOOST_STATIC_CONSTEXPR char ctti_skip_until_runtime[] = runtime_skip_until; \ }}} /* namespace boost::typeindex::detail */ \ /**/ /// @endcond #if defined(BOOST_TYPE_INDEX_DOXYGEN_INVOKED) /* Nothing to document. All the macro docs are moved to <boost/type_index.hpp> */ #elif defined(BOOST_TYPE_INDEX_CTTI_USER_DEFINED_PARSING) # include <boost/preprocessor/facilities/expand.hpp> BOOST_PP_EXPAND( BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS BOOST_TYPE_INDEX_CTTI_USER_DEFINED_PARSING ) #elif defined(_MSC_VER) && defined (BOOST_NO_CXX11_NOEXCEPT) // sizeof("const char *__cdecl boost::detail::ctti<") - 1, sizeof(">::n(void)") - 1 BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS(40, 10, false, "") #elif defined(_MSC_VER) && !defined (BOOST_NO_CXX11_NOEXCEPT) // sizeof("const char *__cdecl boost::detail::ctti<") - 1, sizeof(">::n(void) noexcept") - 1 BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS(40, 19, false, "") #elif defined(__clang__) && defined(__APPLE__) // Someone made __clang_major__ equal to LLVM version rather than compiler version // on APPLE platform. // // Using less efficient solution because there is no good way to detect real version of Clang. // sizeof("static const char *boost::detail::ctti<") - 1, sizeof("]") - 1, true, "???????????>::n() [T = int" BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS(39, 1, true, "T = ") #elif defined(__clang__) && (__clang_major__ < 3 || (__clang_major__ == 3 && __clang_minor__ == 0)) // sizeof("static const char *boost::detail::ctti<") - 1, sizeof(">::n()") - 1 // note: checked on 3.0 BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS(39, 6, false, "") #elif defined(__clang__) && (__clang_major__ >= 4 || (__clang_major__ == 3 && __clang_minor__ > 0)) // sizeof("static const char *boost::detail::ctti<") - 1, sizeof("]") - 1, true, "int>::n() [T = int" // note: checked on 3.1, 3.4 BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS(39, 1, true, "T = ") #elif defined(__EDG__) && !defined(BOOST_NO_CXX14_CONSTEXPR) // sizeof("static cha boost::detail::ctti<T>::s() [with I = 40U, T = ") - 1, sizeof("]") - 1 // note: checked on 4.14 BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS(58, 1, false, "") #elif defined(__EDG__) && defined(BOOST_NO_CXX14_CONSTEXPR) // sizeof("static const char *boost::detail::ctti<T>::n() [with T = ") - 1, sizeof("]") - 1 // note: checked on 4.14 BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS(57, 1, false, "") #elif defined(__GNUC__) && (__GNUC__ < 7) && !defined(BOOST_NO_CXX14_CONSTEXPR) // sizeof("static constexpr char boost::detail::ctti<T>::s() [with unsigned int I = 0u; T = ") - 1, sizeof("]") - 1 BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS(81, 1, false, "") #elif defined(__GNUC__) && (__GNUC__ >= 7) && !defined(BOOST_NO_CXX14_CONSTEXPR) // sizeof("static constexpr char boost::detail::ctti<T>::s() [with unsigned int I = 0; T = ") - 1, sizeof("]") - 1 BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS(80, 1, false, "") #elif defined(__GNUC__) && defined(BOOST_NO_CXX14_CONSTEXPR) // sizeof("static const char* boost::detail::ctti<T>::n() [with T = ") - 1, sizeof("]") - 1 BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS(57, 1, false, "") #else // Deafult code for other platforms... Just skip nothing! BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS(0, 0, false, "") #endif #undef BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS namespace boost { namespace typeindex { namespace detail { template <bool Condition> BOOST_CXX14_CONSTEXPR inline void assert_compile_time_legths() BOOST_NOEXCEPT { BOOST_STATIC_ASSERT_MSG( Condition, "TypeIndex library is misconfigured for your compiler. " "Please define BOOST_TYPE_INDEX_CTTI_USER_DEFINED_PARSING to correct values. See section " "'RTTI emulation limitations' of the documentation for more information." ); } template <class T> BOOST_CXX14_CONSTEXPR inline void failed_to_get_function_name() BOOST_NOEXCEPT { BOOST_STATIC_ASSERT_MSG( sizeof(T) && false, "TypeIndex library could not detect your compiler. " "Please make the BOOST_TYPE_INDEX_FUNCTION_SIGNATURE macro use " "correct compiler macro for getting the whole function name. " "Define BOOST_TYPE_INDEX_CTTI_USER_DEFINED_PARSING to correct value after that." ); } template <unsigned int ArrayLength> BOOST_CXX14_CONSTEXPR inline const char* skip_begining_runtime(const char* begin, boost::false_type) BOOST_NOEXCEPT { return begin; } template<class ForwardIterator1, class ForwardIterator2> BOOST_CXX14_CONSTEXPR inline ForwardIterator1 constexpr_search( ForwardIterator1 first1, ForwardIterator1 last1, ForwardIterator2 first2, ForwardIterator2 last2) BOOST_NOEXCEPT { if (first2 == last2) { return first1; // specified in C++11 } while (first1 != last1) { ForwardIterator1 it1 = first1; ForwardIterator2 it2 = first2; while (*it1 == *it2) { ++it1; ++it2; if (it2 == last2) return first1; if (it1 == last1) return last1; } ++first1; } return last1; } BOOST_CXX14_CONSTEXPR inline int constexpr_strcmp(const char *v1, const char *v2) BOOST_NOEXCEPT { while (*v1 != '\0' && *v1 == *v2) { ++v1; ++v2; }; return static_cast<int>(*v1) - *v2; } template <unsigned int ArrayLength> BOOST_CXX14_CONSTEXPR inline const char* skip_begining_runtime(const char* begin, boost::true_type) BOOST_NOEXCEPT { const char* const it = constexpr_search( begin, begin + ArrayLength, ctti_skip_until_runtime, ctti_skip_until_runtime + sizeof(ctti_skip_until_runtime) - 1 ); return (it == begin + ArrayLength ? begin : it + sizeof(ctti_skip_until_runtime) - 1); } template <unsigned int ArrayLength> BOOST_CXX14_CONSTEXPR inline const char* skip_begining(const char* begin) BOOST_NOEXCEPT { assert_compile_time_legths<(ArrayLength > ctti_skip_size_at_begin + ctti_skip_size_at_end)>(); return skip_begining_runtime<ArrayLength - ctti_skip_size_at_begin>( begin + ctti_skip_size_at_begin, boost::integral_constant<bool, ctti_skip_more_at_runtime>() ); } #if !defined(__clang__) && defined(__GNUC__) && !defined(BOOST_NO_CXX14_CONSTEXPR) template <unsigned int... I> struct index_seq {}; template <typename Left, typename Right> struct make_index_sequence_join; template <unsigned int... Left, unsigned int... Right> struct make_index_sequence_join<index_seq<Left...>, index_seq<Right...> > { typedef index_seq<Left..., Right...> type; }; template <unsigned int C, unsigned int D> struct make_index_seq_impl { typedef typename make_index_sequence_join< typename make_index_seq_impl<C, D / 2>::type, typename make_index_seq_impl<C + D / 2, (D + 1) / 2>::type >::type type; }; template <unsigned int C> struct make_index_seq_impl<C, 0> { typedef index_seq<> type; }; template <unsigned int C> struct make_index_seq_impl<C, 1> { typedef index_seq<C> type; }; template <char... C> struct cstring { static constexpr unsigned int size_ = sizeof...(C); static constexpr char data_[size_] = { C... }; }; template <char... C> constexpr char cstring<C...>::data_[]; #endif }}} // namespace boost::typeindex::detail namespace boost { namespace detail { /// Noncopyable type_info that does not require RTTI. /// CTTI == Compile Time Type Info. /// This name must be as short as possible, to avoid code bloat template <class T> struct ctti { #if !defined(__clang__) && defined(__GNUC__) && !defined(BOOST_NO_CXX14_CONSTEXPR) //helper functions template <unsigned int I> constexpr static char s() BOOST_NOEXCEPT { // step constexpr unsigned int offset = (I >= 10u ? 1u : 0u) + (I >= 100u ? 1u : 0u) + (I >= 1000u ? 1u : 0u) + (I >= 10000u ? 1u : 0u) + (I >= 100000u ? 1u : 0u) + (I >= 1000000u ? 1u : 0u) ; #if defined(BOOST_TYPE_INDEX_FUNCTION_SIGNATURE) return BOOST_TYPE_INDEX_FUNCTION_SIGNATURE[I + offset]; #elif defined(__FUNCSIG__) return __FUNCSIG__[I + offset]; #else return __PRETTY_FUNCTION__[I + offset]; #endif } template <unsigned int ...Indexes> constexpr static const char* impl(::boost::typeindex::detail::index_seq<Indexes...> ) BOOST_NOEXCEPT { return ::boost::typeindex::detail::cstring<s<Indexes>()...>::data_; } template <unsigned int D = 0> // `D` means `Dummy` constexpr static const char* n() BOOST_NOEXCEPT { #if defined(BOOST_TYPE_INDEX_FUNCTION_SIGNATURE) constexpr unsigned int size = sizeof(BOOST_TYPE_INDEX_FUNCTION_SIGNATURE); #elif defined(__FUNCSIG__) constexpr unsigned int size = sizeof(__FUNCSIG__); #elif defined(__PRETTY_FUNCTION__) \ || defined(__GNUC__) \ || (defined(__SUNPRO_CC) && (__SUNPRO_CC >= 0x5130)) \ || (defined(__MWERKS__) && (__MWERKS__ >= 0x3000)) \ || (defined(__ICC) && (__ICC >= 600)) \ || defined(__ghs__) \ || defined(__DMC__) constexpr unsigned int size = sizeof(__PRETTY_FUNCTION__); #else boost::typeindex::detail::failed_to_get_function_name(); #endif boost::typeindex::detail::assert_compile_time_legths< (size > boost::typeindex::detail::ctti_skip_size_at_begin + boost::typeindex::detail::ctti_skip_size_at_end + sizeof("const *") - 1) >(); static_assert(!boost::typeindex::detail::ctti_skip_more_at_runtime, "Skipping for GCC in C++14 mode is unsupported"); typedef typename boost::typeindex::detail::make_index_seq_impl< boost::typeindex::detail::ctti_skip_size_at_begin, size - sizeof("const *") + 1 - boost::typeindex::detail::ctti_skip_size_at_begin >::type idx_seq; return impl(idx_seq()); } #else /// Returns raw name. Must be as short, as possible, to avoid code bloat BOOST_CXX14_CONSTEXPR static const char* n() BOOST_NOEXCEPT { #if defined(BOOST_TYPE_INDEX_FUNCTION_SIGNATURE) return boost::typeindex::detail::skip_begining< sizeof(BOOST_TYPE_INDEX_FUNCTION_SIGNATURE) >(BOOST_TYPE_INDEX_FUNCTION_SIGNATURE); #elif defined(__FUNCSIG__) return boost::typeindex::detail::skip_begining< sizeof(__FUNCSIG__) >(__FUNCSIG__); #elif defined(__PRETTY_FUNCTION__) \ || defined(__GNUC__) \ || (defined(__SUNPRO_CC) && (__SUNPRO_CC >= 0x5130)) \ || (defined(__MWERKS__) && (__MWERKS__ >= 0x3000)) \ || (defined(__ICC) && (__ICC >= 600)) \ || defined(__ghs__) \ || defined(__DMC__) return boost::typeindex::detail::skip_begining< sizeof(__PRETTY_FUNCTION__) >(__PRETTY_FUNCTION__); #else boost::typeindex::detail::failed_to_get_function_name(); return ""; #endif } #endif }; }} // namespace boost::detail #endif // BOOST_TYPE_INDEX_DETAIL_COMPILE_TIME_TYPE_INFO_HPP