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Re: sizeof(function) functionality
On Monday 7 July 2003 7:49 pm, Alexandre Oliva wrote:
> > Assuming it doesn't exist already, I think sizeof(function) or something
> > like it would be a very useful GNU Extension for future GCC versions :)
>
> Can't really be done, at least not without surprising semantics.
> IIRC, sizeof already has a well-defined meaning when the argument is a
> function: the function decays to pointer, and you get the size of the
> pointer.
That's why I said "or something like it".
> Besides, sizeof is supposed to return a compile-time
> constant, but the size of a function is most often only known at
> assembly time, or, worse, at link time, in case linker relaxations are
> available. And don't even get me started on ELF dynamic library
> symbol binding and replacement rules :-)
Well, the same mechanism that resolves references might be able to resolve
function sizes too, if the linker is built to handle this. Just a thought :)
Ben