On Sep 9, 2006, at 11:22 AM, Ingo Krabbe wrote:
Am Samstag, 9. September 2006 16:17 schrieb Charles Lambert:
Is there a datatype that represents variable arguments in variable
argument functions [e.g. int foo(int a, ...); ] ?
If so what is it, and what source file could i find it in?
I'm trying to make bindings to the objective-c runtime for ada on my
mac os x 10.4 and there is a line in it as such:
typedef id (*IMP)(id, SEL, ...);
IMP is used in several structs. Any help with this would be greatly
appreciated.
Thank you,
Charles Lambert
I don't know if there is something like a variadic function in
ada. See for
example the vprintf how variadic functions are translated into normal
functions with a va_list argument.
It is defined that a function that has a variadic interface has to
use the
stdarg(3) macros to initialize and read the va_list structure.
There are no
annotations on how to implement variadic function mechanisms than
to provide
the macros as defined in stdarg(3).
I guess i should have been more specific. I meant how does gcc
implement the variable arguments. I understand the va_start, va_arg,
and va_end
are macros. i'm interested in how va_list is implemented. ada doesn't
allow variadic
functions and if i can pass in a single datatype that is in the same
form that the c
runtime expects for the variable args. i can work around this issue.
i did find
std_expanded_builtin_va_start in builtins.c. it apears that va_list
is represented as type tree
in that function (if i'm reading it correctly).
aside from that i haven't been able to figure out what is going on.
I'm not
even sure if that is remotely close to where i should be looking in
the gcc source code.
