Re: CoreBase toll-free bridging

[Luboš Doležel]

On Wed, 27 Mar 2013 09:03:13 +0800, Maxthon Chan wrote:
> Based on your research, I am seriously doubting what is actually
> inside the CoreFoundation binary: is it possible that actually all
> Objective-C code that involves toll-free bridging or like, or maybe
> even more, that is documented as located in Foundation, is actually
> located right in CoreFoundation, and Foundation binary is simply
> (re)exporting symbols for them? Or did Apple made extensive use of
> Objective-C runtime to dynamically bind Core Foundation functions to
> Foundation classes? (which is highly unlikely.)

The situation is as follows:

- Many Foundation classes are not physically located in Foundation, 
they are in the CoreFoundation binary instead.
  This seems to apply to classes that have their CF counterparts 
bridged. I haven't checked whether they use Mach-O re-exports.

- All CoreFoundation types (probably with the exception of CFTimeZone 
only) are implemented in C.
  Then they do bridging in both directions (F->CF and CF->F).

--
Luboš Doležel