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Re: Forwarding and the GNU runtime one more time (was ANN: GNUstep 2.6.0
From: |
Nat! |
Subject: |
Re: Forwarding and the GNU runtime one more time (was ANN: GNUstep 2.6.0 for openSUSE 11.4) |
Date: |
Wed, 22 Jun 2011 11:04:35 +0200 |
Hi
I am generally sorry, that I am not yet an expert on the GNU runtime, but if I
were, I wouldn't ask questions on this mailing list...
Am 22.06.2011 um 09:30 schrieb David Chisnall:
> You seem to misunderstand the notion of a hook. __objc_msg_forward* are
> function pointers in the runtime. They are set in Foundation to something
> that handles the forwarding. The hooks in NeXT / Apple libobjc are different.
>
> _objc_msgForward() in the Mac runtimes is a private function, and
> implementation detail, and something that you should never touch. The fact
> that you are even considering using it directly means that your code is
> probably wrong.
Havent't I read this before ? The second time, I wonder, if I should take that
kind of insinuation, that I am clueless, so kindly...
> With the GNU runtimes, there are four different forwarding hooks that may be
> invoked, so inspecting the IMP returned by the lookup is almost certainly
> wrong.
Ah finally some meat ;) Checking four different hooks is indeed a bit too
tedious for my taste. But since objc_msg_lookup is never returning on a
not-found method (even w/o GNUstep), that's not important anymore anyway.
(Something I did not know beforehand)
>
> As Nicola said, what are you actually trying to achieve? There is almost
> certainly a much simpler way of doing it than this.
>
Depends on your concept of simplicity. objc_msgLookup in combination with
_objc_msgForward
does exactly what I want in one function call.
But I suppose the answer is again, I need two function calls for my purpose in
the GNU runtime.
Ciao
Nat!
------------------------------------------------------
This is your life
and it's ending one minute at a time. -- Palahniuk
- Forwarding and the GNU runtime one more time (was ANN: GNUstep 2.6.0 for openSUSE 11.4), Nat!, 2011/06/21
- RE: Forwarding and the GNU runtime one more time (was ANN : GNUstep 2.6.0 for openSUSE 11.4), Nicola Pero, 2011/06/21
- Re: Forwarding and the GNU runtime one more time (was ANN: GNUstep 2.6.0 for openSUSE 11.4), David Chisnall, 2011/06/22
- Re: Forwarding and the GNU runtime one more time (was ANN: GNUstep 2.6.0 for openSUSE 11.4),
Nat! <=
- Re: Forwarding and the GNU runtime one more time (was ANN: GNUstep 2.6.0 for openSUSE 11.4), David Chisnall, 2011/06/22
- Re: Forwarding and the GNU runtime one more time (was ANN : GNUstep 2.6.0 for openSUSE 11.4), Nicola Pero, 2011/06/22
- Re: Forwarding and the GNU runtime one more time (was ANN: GNUstep 2.6.0 for openSUSE 11.4), Nat!, 2011/06/22
- Re: Forwarding and the GNU runtime one more time (was ANN : GNUstep 2.6.0 for openSUSE 11.4), Nicola Pero, 2011/06/22
- Re: Forwarding and the GNU runtime one more time (was ANN: GNUstep 2.6.0 for openSUSE 11.4), David Chisnall, 2011/06/22