At 10:12 PM -0700 5/13/09, Don Stewart wrote:
heringtonlacey:
At 9:59 PM -0700 5/13/09, Don Stewart wrote:
heringtonlacey:
I have a large body of C/C++ code at work that I'd like to be able
to access from Haskell via FFI. Because the interface to this code
is broad, hsffig would seem to be ideal for the task.
I've run across one serious hitch, though. The existing #include file
graph is complicated and ends up declaring some typedefs multiple times
(albeit in consistent ways). While gcc (for example) rejects such
practice, the Windows C compiler we're using accepts it. Does anyone know
how feasible it would be to get hsffig to accept such practice as
well? I've started looking at the hsffig code (and discovered that
the C
grammar hsffig uses seems to get confused by duplicate typedefs), but
thought I'd ask the list in parallel with my further study.
Have you looked at c2hs? (I'm not sure how familiar people are with
hsffig, but Dimitry Golubovsky can probably comment)
-- Don
Yes, I started this journey with c2hs. Then I moved to hsc2hs, which
appeared to be a "standardized" version of the same approach. But my
interface consists of hundreds (maybe thousands) of #defines, structs,
typedefs, etc., so I quickly tired of the boilerplate wrapping code,
modest as it is.
hsc2hs is much simpler than c2hs. In particular, it processes the header
files (unlike hsc2hs) to work out the appropriate type.
Yes, but both c2hs and hsc2hs require the (normally modest but for
this situation burdensome) wrapping code. hsffig would produce a
(huge) Haskell module with all the interface components available.
(In fact I have some concern about the module being too big.) A big
win for me would be the ability to write concise code to drill down
through nested C structures returned by the foreign functions
(without having to process each such module through c2hs or hsc2hs).
I'd be interesting to hear how you go with hsffig (and you should
contact the author!).
I'll let the list know how it goes, and will certainly be in touch
with Dimitry.
Thanks.
Dean
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