ghci and unfoldings?
Conal Elliott
conal at conal.net
Thu Jan 21 00:11:42 UTC 2016
Thanks for the additional tips. I'm having very inconsistent results with
unfolding definitions from other modules in ghci, even with all of these
flags. I'll keep poking at it until I have some consistent info and
questions.
-- Conal
On Wed, Jan 20, 2016 at 7:46 AM, Simon Peyton Jones <simonpj at microsoft.com>
wrote:
> Ah….It seems that to get unfoldings exposed in the *module you are
> compiling* you need *both*
>
> · -fno-omit-interface-pragmas
>
> · -fexpose-all-unfoldings
>
>
>
> And GHCi and –O0 both imply –fomit-interface-pragmas.
>
>
>
> To see the unfoldings on *imported* functions you need
> –fno-ignore-interface pragmas.
>
>
>
> Arguably –fexpose-all-unfoldings should override –fomit-interface-pragmas,
> which it doesn’t at the moment. Open a ticket if you think that would be
> useful and important. I can give guidance about the places.
>
>
>
> Simon
>
>
>
>
>
> *From:* conal.elliott at gmail.com [mailto:conal.elliott at gmail.com] *On
> Behalf Of *Conal Elliott
> *Sent:* 18 January 2016 17:47
> *To:* Simon Peyton Jones <simonpj at microsoft.com>
> *Cc:* Edward Z. Yang <ezyang at mit.edu>; Andrew Farmer <afarmer at ittc.ku.edu>;
> ghc-devs at haskell.org
>
> *Subject:* Re: ghci and unfoldings?
>
>
>
> 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 <simonpj at microsoft.com>
> wrote:
>
> Or -fexpose-all-unfoldings?
>
> Simon
>
> | -----Original Message-----
> | From: ghc-devs [mailto:ghc-devs-bounces at haskell.org
> <ghc-devs-bounces at haskell.org>] On Behalf Of
> | Edward Z. Yang
> | Sent: 18 January 2016 06:37
> | To: Conal Elliott <conal at conal.net>
> | Cc: Andrew Farmer <afarmer at ittc.ku.edu>; ghc-devs at 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
> | <allbery.b at gmail.com>
> | > wrote:
> | >
> | > > On Sun, Jan 17, 2016 at 9:40 PM, Conal Elliott <conal at conal.net>
> | 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 at gmail.com
> | > > ballbery at sinenomine.net
> | > > unix, openafs, kerberos, infrastructure, xmonad
> | > >
> | https://na01.safelinks.protection.outlook.com/?url=http%3a%2f%2fsine
> | > >
> | nomine.net
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