demangle_util.h

Go to the documentation of this file.

#ifndef DEMANGLE_UTIL_H
#define DEMANGLE_UTIL_H

#include <string>


#if defined( __clang__ ) && defined( __has_include )
# if __has_include(<cxxabi.h>)
#  define HAS_CXXABI_H
# endif
#elif defined( __GLIBCXX__ ) || defined( __GLIBCPP__ )
# define HAS_CXXABI_H
#endif

#if defined( HAS_CXXABI_H )
# include <cxxabi.h>
# include <cstdlib>
# include <cstddef>
#endif

namespace BT
{

inline char const * demangle_alloc( char const * name ) noexcept;
inline void demangle_free( char const * name ) noexcept;

class scoped_demangled_name
{
private:
    char const * m_p;

public:
    explicit scoped_demangled_name( char const * name ) noexcept :
        m_p( demangle_alloc( name ) )
    {
    }

    ~scoped_demangled_name() noexcept
    {
        demangle_free( m_p );
    }

    char const * get() const noexcept
    {
        return m_p;
    }

    scoped_demangled_name( scoped_demangled_name const& ) = delete;
    scoped_demangled_name& operator= ( scoped_demangled_name const& ) = delete;
};


#if defined( HAS_CXXABI_H )

inline char const * demangle_alloc( char const * name ) noexcept
{
    int status = 0;
    std::size_t size = 0;
    return abi::__cxa_demangle( name, NULL, &size, &status );
}

inline void demangle_free( char const * name ) noexcept
{
    std::free( const_cast< char* >( name ) );
}

#else

inline char const * demangle_alloc( char const * name ) noexcept
{
    return name;
}

inline void demangle_free( char const * ) noexcept
{
}

inline std::string demangle( char const * name )
{
    return name;
}

#endif

inline std::string demangle(const std::type_info* info)
{
    if (!info)
    {
        return "void";
    }
    if (info == &typeid(std::string))
    {
        return "std::string";
    }
    scoped_demangled_name demangled_name(info->name());
    char const* const p = demangled_name.get();
    if (p)
    {
        return p;
    }
    else
    {
        return info->name();
    }
}

inline std::string demangle(const std::type_info& info)
{
    return demangle(&info);
}

} // namespace BT

#undef HAS_CXXABI_H

#endif // DEMANGLE_UTIL_H