[Haskell-cafe] Anonymous FFI calls

[Luite Stegeman]

Another example, similar to Manuel's work but for GHCJS JavaScriptFFI
is ghcjs-ffiqq: https://github.com/ghcjs/ghcjs-ffiqq . There is some
automatic marshalling of arguments and results using the ToJSRef /
FromJSRef typeclasses. I'm working on integrating the improvements in
these typeclasses back into ghcjs-base. The quasiquoter might be moved
there too, but I'm not sure yet.

The (ugly) implementation is here:
https://github.com/ghcjs/ghcjs-ffiqq/blob/master/src/GHCJS/Foreign/QQ.hs

Adapting to ccall imports should be straightforward, but implementing
the full functionality would require a bit more stub code generation,
since this code depends on GHCJS' native support for inline foreign
import argument placeholders ($1, $2, $3 etc) placeholders.

luite

On Wed, Feb 11, 2015 at 11:40 PM, Simon Peyton Jones
<simonpj at microsoft.com> wrote:
> This may be relevant.  http://www.cse.unsw.edu.au/~chak/papers/CMCK14.html
> Manuel gave a talk about something like this at the Haskell Symposium.
>
> Simon
>
> |  -----Original Message-----
> |  From: Haskell-Cafe [mailto:haskell-cafe-bounces at haskell.org] On Behalf
> |  Of Francesco Mazzoli
> |  Sent: 11 February 2015 10:26
> |  To: haskell; ghc-devs at haskell.org
> |  Subject: [Haskell-cafe] Anonymous FFI calls
> |
> |  Hi,
> |
> |  I am in a situation where it would be very useful to call C functions
> |  without an explicit FFI import.  For example, I'd like to be able to
> |  do
> |
> |      (foreign import ccall "cadd" :: CInt -> CInt -> CInt) 1 2
> |
> |  instead of declaring the foreign import explicitely at the top level.
> |
> |  Is there a way to do this or to achieve similar results in some other
> |  way?
> |
> |  If not, I imagine it would be easy to implement such a facility in
> |  GHC, given that the code implementing calling to C functions must
> |  already be present to implement "proper" FFI imports.  I think such an
> |  addition would be useful in many cases.
> |
> |  Thanks,
> |  Francesco
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