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C stubs with many args.
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Date: 2009-11-29 (15:31)
From: Guillaume Yziquel <guillaume.yziquel@c...>
Subject: C stubs with many args.

I've been recently reworking Maxence Guesdon's OCaml-R binding in order 
to provide a tighter integration with, and I'm currently trying to 
reverse-engineer the way closures are handled in R. So I've written up 
this small C stub code for a function with 6 parameters:

> void Rf_begincontext (RCNTXT * cptr, int flags, SEXP syscall, SEXP env, SEXP sysp, SEXP promargs, SEXP callfun);
> CAMLprim value r_reveng_begin_context_native (value flags, value syscall, value env, value sysp, value promargs, value callfun) {
>   CAMLparam5(flags, syscall, env, sysp, promargs);
>   CAMLxparam1(callfun);
>   CAMLlocal1(result);
>   result = caml_alloc(1, Abstract_tag);
>   Rf_begincontext ( (context) Field(result, 0), Int_val(flags), Sexp_val(syscall), Sexp_val(env),
>                     Sexp_val(sysp), Sexp_val(promargs), Sexp_val(callfun));
>   CAMLreturn(result);
> }
> CAMLprim value r_reveng_begin_context_bytecode (value * argv, int argn) {
> } 

I've been trying to follow section 18.1.2 of:


Unfortunately, I'm a bit confused as to what should the CAMLparam and 
such be for the bytecode stub.

Could someone provide me with an example somewhere?

All the best,

      Guillaume Yziquel