> > objc_msgSend is written in assembly. There are two reasons for this: one is that it's not possible to write a function which preserves unknown arguments and jumps to an arbitrary function pointer in C.

> Wow... this is a bit off topic but can anyone expand on this side note and explain why?

I believe it's because C's variadic argument function call interface is not the same as the fixed-arguments function call interface so you can't just cast a function pointer to a variadic function pointer. And even if it worked on some architectures it sure as hell would not be standards compliant code.