Re: Way to look up a C++ function name?

["Kevin P. Fleming" <kpfleming at digium dot com>]

On 10/14/2011 01:14 PM, david.hagood@gmail.com wrote:
> I have a chunk of code that loads a shared library + a file containing a
> list of functions in that library (it's a scripting language parser, for
> the curious - the functions implement verbs in the scripting language).
>
> This works fine with C functions, as the dlsym() function can find the
> function name in the shared lib. However, with C++ functions it won't work
> unless you pass the mangled function name in to dlsym. So I would either
> have to put the mangled name in my function definition file (and that
> would change based upon the specific C++ compiler used - I'd like to
> support both GCC and MSVC if possible). Putting aside the issue of
> different compilers for the moment, is there a way to, given a string such
> as "void foo(int&)" convert that to the mangled name GCC would emit, and
> do so at run time?

It would probably be much easier and more reliable to wrap these 
function declaration in 'extern "C"' wrappers to give them C calling 
semantics... although that would impact the types of parameter arguments 
and return values they could accept and return.

> e.g.
>
> int my_example(vector<string>  names)
> {
>     for (vector<string>::iterator i = names.begin();i != names.end(); ++i)
>       std::cout<<  "Function "<<  *i<<  " mangles to "<<
> some_magic_libgcc_function((*i).c_str())<<  std::endl;
> }


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Kevin P. Fleming
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