I'd love for the implementation to be as powerful as the documentation suggests it is :D
However, yes, in the meantime, fixing the documentation would be great! 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. -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/1d982ba10f590828b78eba992e73315dee33f78a/ > | 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
