Pointer to the current function

Pointer to the current function

[Sergio Costas]

Hello:

I wonder what do you think about a patch to implement getting a pointer 
to the current function. Is it a "no, under no circumstances"? Or it is 
a "maybe, show us the code"?

I'll explain better what I mean: currently there is the statement 
__func__ that returns a string with the name of the current function. 
This allows to print (for example from a macro) which is the current 
function name. Along with __LINE__ it is useful for debugging, among 
other things.

But I miss an statement that allows to have a pointer to the current 
function. Thus putting it in a macro would allow to have a pointer to 
the function where that macro is. It would be very useful for 
coroutines, for example. I've been searching and can't find a simple way 
of doing it. Some people proposes to use __func__ combined with dlsym 
and dlopen, but it is slow and clearly a hack, and forces to use 
-rdynamic, which is not always possible/desirable. Currently I use 
another macro to define the function itself, passing the desired name as 
an argument and creating a variable with a pointer to it, but it is ugly.

Thanks.

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