Re: ghci and unfoldings?

Oh! I spoke too soon. Yes, that flag does seem to make unfoldings available. Thanks! Now more experimentation. Thanks again! -- Conal On Sun, Jan 17, 2016 at 10:45 PM, Conal Elliott wrote:

Thanks for the suggestion. That flag doesn't appear to help. Still no unfolding info.

On Sun, Jan 17, 2016 at 10:37 PM, Edward Z. Yang wrote:

...

Does passing -fobject-code solve your problem?

Edward

...

Hi Brandon. Thanks for the reply. I’m not sure that it addresses what I was trying to ask. GHCi *does* invoke plugins and even reloads those plugins dynamically when their source code changes. So in this sense ghci does enable optimization, even if it doesn’t perform much optimization on its own. And of course plugins and unfolding are not just about optimization.

I’m not looking for ghci to do optimization, but rather to enable me to more easily develop my GHC plugins. It’s *almost* there already. I just need access to unfoldings from other modules for my plugin’s use.

For context, I’m rebuilding my Haskell-to-hardware compiler https://github.com/conal/talk-2015-haskell-to-hardware, which relies on giving a non-standard but principled interpretation of Haskell programs via a conversion through the language of cartesian closed categories (CCCs). The first back-end is hardware generation (e.g., via Verilog), and I have plans for several other CCC-based interpretations.

In addition to facilitating my plugin development, hosting in ghci will make it much more pleasant for others to *use* the plugin during exploratory programming, just as with ghci use in general. With access to unfoldings, users will be able to generate circuit diagrams and Verilog like those in my compiler talk immediately and directly from within ghci. I also intend to make a GPU back-end for fast interactive graphics etc, which would be much more fun in ghci than with batch compilation. I hope this explanation clarifies my goals and motivation. I hope

Excerpts from Conal Elliott's message of 2016-01-17 22:18:49 -0800: there’s a

...

way to access unfoldings from ghci currently or with a small amount of effort.

Regards, - Conal

On Sun, Jan 17, 2016 at 7:00 PM, Brandon Allbery wrote:

...

On Sun, Jan 17, 2016 at 9:40 PM, Conal Elliott wrote:

...

I'm developing a GHC plugin (using HERMIT), and I'd like to use ghci to speed up development. I'm able to do so, except that my plugin critically needs access to unfoldings, which appear to be unavailable in ghci. A little experimenting with ghc shows me that "-O" is the key, but "-O" is incompatible with "--interactive" (as in ghci). Is there any way to persuade ghci to make unfoldings available?

I think unfoldings are only done as part of optimization, and the bytecode backend doesn't support optimization at all.

-- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com ballbery@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net