Thanks to everyone who replied! It seems like that through a combination of facilities like `libffi' and `addTopDecls' I can do everything that I wanted to do.
I still want to take a shot at implementing anonymous FFI calls, since IMHO I think they are a very small but useful addition to the language. Francesco On 12 February 2015 at 09:29, Simon Peyton Jones <[email protected]> wrote: > | Also, I meant to say that addTopDecls is only exported by > | "Language.Haskell.TH.Syntax". While this is a digression, there are a > | few other handy functions that are oddly left out of > | "Language.Haskell.TH": addDependentFile, addModFinalizer, and possibly > | more. > > That does seem wrong. Do make a patch! > > SIMon > > | > | -Michael > | > | On Wed, Feb 11, 2015 at 3:25 PM, Simon Peyton Jones > | <[email protected]> wrote: > | > I would LOVE someone to improve the documentation for addTopDecls. > | Manuel Chakravarty and Geoff Mainland were responsible for the > | implementation. > | > > | > Simon > | > > | > | -----Original Message----- > | > | From: ghc-devs [mailto:[email protected]] On Behalf Of > | > | Michael Sloan > | > | Sent: 11 February 2015 23:19 > | > | To: Francesco Mazzoli > | > | Cc: [email protected]; haskell > | > | Subject: Re: [Haskell-cafe] Anonymous FFI calls > | > | > | > | It seems like addTopDecls[1] will able to help here. > | Unfortunately, > | > | the function is not well documented and not very discoverable > | > | because it's only exported by Language.Haskell.TH. > | > | > | > | The documentation doesn't mention that it can only be used to > | create > | > | new top level functions and FFI imports[2]. I think that adding > | FFI > | > | imports was the main motivation for implementing it. In the past > | > | I've wanted to generate instances via this function, but > | > | unfortunately it's not implemented.. > | > | > | > | Hope that helps! > | > | -Michael > | > | > | > | [1] http://hackage.haskell.org/package/template-haskell- > | > | 2.9.0.0/docs/Language-Haskell-TH-Syntax.html#v:addTopDecls > | > | > | > | [2] > | > | > | https://github.com/ghc/ghc/blob/1d982ba10f590828b78eba992e73315dee33 > | > | f78a/ > | > | compiler/typecheck/TcSplice.hs#L818 > | > | > | > | On Wed, Feb 11, 2015 at 2:26 AM, Francesco Mazzoli <[email protected]> > | wrote: > | > | > 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 > | > | > _______________________________________________ > | > | > Haskell-Cafe mailing list > | > | > [email protected] > | > | > http://www.haskell.org/mailman/listinfo/haskell-cafe > | > | _______________________________________________ > | > | ghc-devs mailing list > | > | [email protected] > | > | http://www.haskell.org/mailman/listinfo/ghc-devs _______________________________________________ ghc-devs mailing list [email protected] http://www.haskell.org/mailman/listinfo/ghc-devs
