Steel Bank Common Lisp

Hi John,

I did something similar using gcc-xml and UFFI declarations. It's on my 
list of things to do to generate sb-alien decl's directly. As for 
cycles and forward ref'ed classes, UFFI (and therefore presumably the 
underlying sb-alien stuff) allows for an empty foreign struct 
definition that can be redefined later with the proper fields. I chase 
down all the forward referenced types as dictated by the gcc-xml output 
and attempt to do the right thing. I think in this case I would 
generate the type declarations for bar and a forward reference to foo 
and then follow that with a proper struct declaration for foo.

Cyrus

On Apr 19, 2005, at 6:21 AM, John Morrison wrote:

> Hi;
>
> Short question: is SBCL's alien package "smart" enough to handle
> mutually-dependent alien types?
>
> E.g. (and sorry for the 'C')
>
> struct foo
> {
>     struct *bar b;
> };
>
> struct bar
> {
>     struct *foo f;
> };
>
> Long version: I am writing an sb-alien generator taking gccxml output
> as input.  I wrote a dumb graph library which has detected cycles in
> the bindings graph (where dependency indicates dependency upon a
> type).  If sb-alien is not smart enough, does anybody have any
> algorithmic suggestions for workarounds?
>
> -jm
>
> -- 
> ==== John Morrison
> ==== MAK Technologies Inc.
> ==== 10 Fawcett Street, Cambridge, MA 02138
> ==== http://www.mak.com/
> ==== vox:617-876-8085 x115
> ==== fax:617-876-9208
> ==== jm@...
>
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by: New Crystal Reports XI.
> Version 11 adds new functionality designed to reduce time involved in
> creating, integrating, and deploying reporting solutions. Free runtime 
> info,
> new features, or free trial, at: 
> http://www.businessobjects.com/devxi/728
> _______________________________________________
> Sbcl-help mailing list
> Sbcl-help@...
> https://lists.sourceforge.net/lists/listinfo/sbcl-help

On Tue, 19 Apr 2005, John Morrison wrote:

> Short question: is SBCL's alien package "smart" enough to handle
> mutually-dependent alien types?

Yes, but there are known bugs. The common work-around is to LOAD the file
containing the definitions, as opposed to COMPILE-FILE, then LOAD.

If you run into trouble that this advice doesn't work with, sbcl-devel 
wants to know. If the LOAD trick works, then it's a known issue.

Cheers,

  -- Nikodemus              Schemer: "Buddha is small, clean, and serious."
                   Lispnik: "Buddha is big, has hairy armpits, and laughs."