Re: ghci and unfoldings?

The minimum flags I've found to get ghci to provide unfoldings are -O and -object-code. And it appears that both flags need to be present the first time I load a module into GHCi. (I'm putting the flags in an OPTIONS_GHC pragma.) On Mon, Jan 18, 2016 at 9:46 AM, Conal Elliott wrote:

That's the flag I would expect. It doesn't seem to help or hinder availability of unfoldings in GHCi. Do you think it should?

And Happy Birthday, Simon!

Warmly, - Conal

On Monday, January 18, 2016, Simon Peyton Jones wrote:

...

Or -fexpose-all-unfoldings?

Simon

| -----Original Message----- | From: ghc-devs [mailto:ghc-devs-bounces@haskell.org] On Behalf Of | Edward Z. Yang | Sent: 18 January 2016 06:37 | To: Conal Elliott | Cc: Andrew Farmer ; ghc-devs@haskell.org | Subject: Re: ghci and unfoldings? | | Does passing -fobject-code solve your problem? | | Edward | | Excerpts from Conal Elliott's message of 2016-01-17 22:18:49 -0800: | > 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 | > 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 | > > | https://na01.safelinks.protection.outlook.com/?url=http%3a%2f%2fsine | > > | nomine.net&data=01%7c01%7csimonpj%40064d.mgd.microsoft.com%7cbaf2ef5 | > > | 5f8af447b42e608d31fd1cec1%7c72f988bf86f141af91ab2d7cd011db47%7c1&sda | > > ta=qMNmL5LmkgMp0ebkr6SzPQIwhySqOicZgEdW%2fhe6Q%2b0%3d | > > | _______________________________________________ | ghc-devs mailing list | ghc-devs@haskell.org | https://na01.safelinks.protection.outlook.com/?url=http%3a%2f%2fmail.h | askell.org%2fcgi-bin%2fmailman%2flistinfo%2fghc- | devs%0a&data=01%7c01%7csimonpj%40064d.mgd.microsoft.com%7cbaf2ef55f8af | 447b42e608d31fd1cec1%7c72f988bf86f141af91ab2d7cd011db47%7c1&sdata=veoz | Ab6M7N9jZaJZ9tgXZ%2fI8jq7U%2b4YM1FcSXvqTcaw%3d