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Re: __builtin_apply
Hi,
these functions are also used in Objective-C for message forwarding.
Unfortunatly the functions seem to be broken in various gcc
versions/platforms. You can take a look at the libFoundation Objective-C
library to see how to calculate the arguments.
There is also a library called libffi which can be used for dynamic
function calls, but AFAIK not for decoding these.
Greetings
Helge
Stuart Meikle wrote:
>
> Hi folks,
>
> What I'm trying to do:-> pass unknown parameters to a remote function
> running on a similar machine and return the results. machine
> configurations are the same - i expect to be able to call the remote
> functions directly using a copy of the stack from the other machine.
>
> blah. anyway i see that there are 3 functions : __builtin_apply ,
> __builtin_apply_args, etc which should enable me to do this. but, in fact
> don't because they say that one of the parameters is 'tricky' to
> calculate. this makes them rather useless as there's a danger i can mess
> the stack up by getting size wrong.
>
> i guess forming function calls is done all the time in GCC, so i can't
> understand why these functions are so mysterious. can we fix them ?? I can
> do this myself if you guys are busy, but then where can I find out about
> gcc's function-calling strategy ? ( I see from assembler output that's its
> not quite as trivial as pushing the parameters onto the stack and then
> popping them off in the function ).
>
> anyway, any help would be appreciated, thanks
>
> Stuart
>
> Stuart Meikle
> Technical Director
>
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