Mixing Ada+C+Assembly

[Alexandre Bencz]

Hi :)

I'm trying to add codes in C and Assembly with ada, but I have some doubts,
such as:

working with C functions that require more than one argument, eg:

 int sum(int a, int b, int c, int d)
{
return a+b+c+d;
}

and how can I join with assembly code in Ada.

Thanks

[pcas1986]

The answer to your first question is to pass across a pointer to a record of
the four integers you wish to add together in C. You should read the
"Interfaces to other languages" annex in the Ada Ref Manual. It was Annex B
for Ada 95. Don't know about 2005 or 2010. You will almost certainly find some
C interface examples in the standard GNAT libraries.

I've never done an assembly language interface so I cannot help you there. I
vaguely remember seeing an example in one of John Barnes' earlier books on Ada
- an Ada 83 version I think.

You could also ask your questions on the usenet comp.lang.ada. Its a lot more
active than this service and they get many questions similar to yours.

[Simon Wright]

I just spent 15 minutes answering your question, but %^$£$@%$ Sourceforge lost
it (I really need to remember that Sourceforge doesn't work well with Safari
and tabs).

See the GNAT User Guide for interfacing with
C and inline
assembler (at the end).

And, Paul isn't correct about needing to wrap the arguments in a record (the C
expects 4 arguments, not one!) See the ARM.

[Martin Krischik]

Hi bencz.

A very exotic place for this question ;-) . May I humbly suggest comp.lang.ada
for questions of this type:

http://groups.google.com/group/comp.lang.ada/topics

While the two answers you got are certainly good at comp.lang.ada you might
get even more interesting answers to you questions.

Martin