[Rd] too many arguments in foreign function call
Warnes, Gregory R
Mon, 16 Jul 2001 10:50:25 -0400
I would like to create an R package that will depend on the ability to use
more than 65 parameters. Would it be reasonable to expect this patch (or
something equivalent) to be part of , say R > 1.3.1 ?
Would it help if I submit an official bug report?
From: Gregory R. Warnes [mailto:email@example.com]
> Duncan Templ Lang wrote:
> > Gregory R. Warnes wrote:
> > >
> > > Hi all,
> > >
> > >
> > > Looking at the code in src/main/dotcode.c, I see that
> MAX_ARGS is set to
> > > 65.
> > >
> > > While it is possible to work around this limitation, it seems
> > > arbitrary. I propose increasing the arbitrary value to
> 255 and adding
> > > appropriate documentation to the Foreign manual page.
> > >
> > > Any objections/comments?
> > Unfortunately, it isn't quite as simple as that. The code
> that uses
> > MAX_ARGS would also need to be extended and that involves
> adding the
> > remaining cases to the switch statement in do_dotCode() and
> > do_dotcall() in src/main/dotcode.c There's no reason why
> it can't be
> > done. Somebody simply has to generate the appropriate code,
> > presumably programmatically with a little script. I
> recall this was
> > extended in S4, but 64 was adequate for that context.
> > I imagine that there are some systems limit the number of
> > one can have to a routine.
> OK. I wrote a little R script to generate the necessary case
> statements. Since these code chunks are rather large (7140 lines
> each!), I modifed src/main/dotcode to #include the case
> statements from
> the (new) files /src/main/dotcode_cases.c and
> . I'm not sure that this is the best way to do this, but including
> these code chunks in dotcode.c makes it unmanagable.
> While I was making and (this time) testing the changes, I
> noticed that
> one declaration had the value 65 hardcoded rather than
> using MAX_ARGS.
> I've uploaded a tgz file containing the patch and the R script that
> generated the case statement/call code to
> With this patch applied, the fortran subroutin I'm using
> now works fine
> with 85 arguments. I imagine that it should be tested on several
> platforms to ensure that there isn't (as Duncan menioned)
> that a problem
> with compilers/platforms restricting the number of arguments.
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