Re: Remote GHCi

I’m not sure how much I can actually contribute to this, but I’ll just add a few pointers to nothing gets lost. I’m not very familiar with remote ghci, but I think that there is some overlap between remote ghci and out of process template haskell compilation[1][2]. Most of ghcjs’s TH code is in src/Gen2/TH.hs. To be honest, I haven’t had much time last year to do anything for the out of process th stuff. I’m planing to get back at oopth, once we got shaking-up-ghc[3] to build cross compilers properly. From the looks of it, that could be soon :) I only know about the ghcjs repl[4] through twitter. I’m certain luite can share a lot more here. With respect to remote ghci, I haven’t had much time to look into it. The main focus of out of process th (for me) was getting TH to work for cross compiler, which means shipping code to a remote process through some kind of channel that the remote allows*. Hope this might help in some way. Cheers, Moritz [1]: https://github.com/ghcjs/ghcjs/wiki/Porting-GHCJS-Template-Haskell-to-GHC [2]: https://github.com/angerman/oopth [3]: https://github.com/snowleopard/shaking-up-ghc [4]: https://twitter.com/acid2/status/614076905990582272/photo/1 [*]: E.g. getting this to work for iOS.

On Jan 8, 2016, at 2:01 PM, Edward Z. Yang wrote:

I was reviewing some history here, and I realized that the GHCJS folks had previous implemented this:

https://mail.haskell.org/pipermail/ghc-devs/2015-November/010478.html

What ever happened to this line of work? Does remote GHCi subsume it?

Edward

Excerpts from Simon Marlow's message of 2015-11-17 02:10:55 -0800:

...

Hi folks - I've been thinking about changing the way we run interpreted code so that it would be run in a separate process. It turns out this has quite a few benefits, and would let us kill some of the really awkward hacks we have in GHC to work around problems that arise because we're running interpreted code and the compiler on the same runtime.

I summarised the idea here: https://ghc.haskell.org/trac/ghc/wiki/RemoteGHCi

I'd be interested to hear if anyone has any thoughts around this, particularly if doing this would make your life difficult in some way. Are people relying on dynCompileExpr for anything?

Cheers, Simon