Re: Mangled name of c++ symbol as string

[Daniel Lohmann <daniel dot lohmann at informatik dot uni-erlangen dot de>]

Helge Bahmann schrieb:
> I have to access C++ symbols in multiple places through their linker names and 
> wondered if there is something more maintainable than having 
> to "brain-mangle" the names? What I would need is a builtin that transforms a 
> name into its mangled representation as string at compile-time.
>
> Essentially I would like to replace something like
>
> __asm__(".set _ZN5media11colorspaces11YUV_CCIR601E, 
> _ZN5media11colorspaces3YUVE\n"));
>
> with
>
> __asm__(".set " __mangle__(media::colorspaces::YUV_CCIR601E)  "," 
> __mangle__(media::colorspace::YUV) "\n");
>
> (to create a symbol alias) or
>
> dlsym(hdl, "_ZN5media11colorspaces3YUVE");
>
> with
>
> dlsym(hdl, __mangle__(media::colorspaces::YUV));
>
> As far as I could find the only assistance provided with name-mangling is 
> run-time and only deals with the inverse problem. Does something like this 
> exist 

Hi Helge,

I am afraid something like this doesn't exist. I have been desperately 
looking for it as well and asked for it on this list a couple of months ago 
(http://gcc.gnu.org/ml/gcc-help/2006-12/msg00107.html) - neither answer nor 
success so far :-/

> (or is there a good reason why it *doesn't* exist and I should not be 
> doing what I do?)

Good question. I do not see any reasons why compile-time name 
mangling/demangling should not be done. It even does not have to be a 
builtin function. At least in situations where you could do without 
scope/argument dependent name lookup -- probably 99% of the situations this 
feature is desired in practice -- a simple string-level preprocessor might 
do it.

If you find anything please let me know. So will I do.

Daniel