142 lines
3.7 KiB
C++
142 lines
3.7 KiB
C++
// Copyright (c) 2014-2021 Dr. Colin Hirsch and Daniel Frey
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
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#ifndef TAO_PEGTL_DEMANGLE_HPP
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#define TAO_PEGTL_DEMANGLE_HPP
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#include <ciso646>
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#include <string_view>
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#include "config.hpp"
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namespace TAO_PEGTL_NAMESPACE
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{
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#if defined( __clang__ )
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#if defined( _LIBCPP_VERSION )
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template< typename T >
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[[nodiscard]] constexpr std::string_view demangle() noexcept
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{
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constexpr std::string_view sv = __PRETTY_FUNCTION__;
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constexpr auto begin = sv.find( '=' );
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static_assert( begin != std::string_view::npos );
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return sv.substr( begin + 2, sv.size() - begin - 3 );
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}
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#else
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// When using libstdc++ with clang, std::string_view::find is not constexpr :(
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template< char C >
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constexpr const char* find( const char* p, std::size_t n ) noexcept
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{
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while( n ) {
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if( *p == C ) {
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return p;
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}
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++p;
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--n;
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}
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return nullptr;
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}
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template< typename T >
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[[nodiscard]] constexpr std::string_view demangle() noexcept
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{
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constexpr std::string_view sv = __PRETTY_FUNCTION__;
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constexpr auto begin = find< '=' >( sv.data(), sv.size() );
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static_assert( begin != nullptr );
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return { begin + 2, sv.data() + sv.size() - begin - 3 };
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}
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#endif
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#elif defined( __GNUC__ )
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#if( __GNUC__ == 7 )
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// GCC 7 wrongly sometimes disallows __PRETTY_FUNCTION__ in constexpr functions,
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// therefore we drop the 'constexpr' and hope for the best.
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template< typename T >
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[[nodiscard]] std::string_view demangle() noexcept
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{
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const std::string_view sv = __PRETTY_FUNCTION__;
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const auto begin = sv.find( '=' );
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const auto tmp = sv.substr( begin + 2 );
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const auto end = tmp.rfind( ';' );
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return tmp.substr( 0, end );
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}
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#elif( __GNUC__ == 9 ) && ( __GNUC_MINOR__ < 3 )
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// GCC 9.1 and 9.2 have a bug that leads to truncated __PRETTY_FUNCTION__ names,
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// see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91155
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template< typename T >
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[[nodiscard]] constexpr std::string_view demangle() noexcept
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{
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// fallback: requires RTTI, no demangling
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return typeid( T ).name();
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}
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#else
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template< typename T >
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[[nodiscard]] constexpr std::string_view demangle() noexcept
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{
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constexpr std::string_view sv = __PRETTY_FUNCTION__;
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constexpr auto begin = sv.find( '=' );
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static_assert( begin != std::string_view::npos );
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constexpr auto tmp = sv.substr( begin + 2 );
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constexpr auto end = tmp.rfind( ';' );
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static_assert( end != std::string_view::npos );
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return tmp.substr( 0, end );
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}
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#endif
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#elif defined( _MSC_VER )
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#if( _MSC_VER < 1920 )
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template< typename T >
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[[nodiscard]] constexpr std::string_view demangle() noexcept
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{
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const std::string_view sv = __FUNCSIG__;
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const auto begin = sv.find( "demangle<" );
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const auto tmp = sv.substr( begin + 9 );
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const auto end = tmp.rfind( '>' );
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return tmp.substr( 0, end );
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}
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#else
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template< typename T >
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[[nodiscard]] constexpr std::string_view demangle() noexcept
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{
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constexpr std::string_view sv = __FUNCSIG__;
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constexpr auto begin = sv.find( "demangle<" );
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static_assert( begin != std::string_view::npos );
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constexpr auto tmp = sv.substr( begin + 9 );
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constexpr auto end = tmp.rfind( '>' );
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static_assert( end != std::string_view::npos );
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return tmp.substr( 0, end );
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}
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#endif
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#else
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template< typename T >
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[[nodiscard]] constexpr std::string_view demangle() noexcept
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{
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// fallback: requires RTTI, no demangling
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return typeid( T ).name();
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}
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#endif
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} // namespace TAO_PEGTL_NAMESPACE
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#endif
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