<div dir="ltr">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.)<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 18, 2016 at 9:46 AM, Conal Elliott <span dir="ltr"><<a href="mailto:conal@conal.net" target="_blank">conal@conal.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>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?<br><br></div>And Happy Birthday, Simon!<br><br></div>Warmly, - Conal<div><div class="h5"><br><div><div><br>On Monday, January 18, 2016, Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com" target="_blank">simonpj@microsoft.com</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Or -fexpose-all-unfoldings?<br>
<br>
Simon<br>
<br>
| -----Original Message-----<br>
| From: ghc-devs [mailto:<a>ghc-devs-bounces@haskell.org</a>] On Behalf Of<br>
| Edward Z. Yang<br>
| Sent: 18 January 2016 06:37<br>
| To: Conal Elliott <<a>conal@conal.net</a>><br>
| Cc: Andrew Farmer <<a>afarmer@ittc.ku.edu</a>>; <a>ghc-devs@haskell.org</a><br>
| Subject: Re: ghci and unfoldings?<br>
|<br>
| Does passing -fobject-code solve your problem?<br>
|<br>
| Edward<br>
|<br>
| Excerpts from Conal Elliott's message of 2016-01-17 22:18:49 -0800:<br>
| > Hi Brandon. Thanks for the reply. I’m not sure that it addresses<br>
| what<br>
| > I was trying to ask. GHCi *does* invoke plugins and even reloads<br>
| those<br>
| > plugins dynamically when their source code changes. So in this sense<br>
| > ghci does enable optimization, even if it doesn’t perform much<br>
| > optimization on its own. And of course plugins and unfolding are not<br>
| just about optimization.<br>
| ><br>
| > I’m not looking for ghci to do optimization, but rather to enable me<br>
| > to more easily develop my GHC plugins. It’s *almost* there already.<br>
| I<br>
| > just need access to unfoldings from other modules for my plugin’s<br>
| use.<br>
| ><br>
| > For context, I’m rebuilding my Haskell-to-hardware compiler<br>
| > <<a href="https://github.com/conal/talk-2015-haskell-to-hardware" target="_blank">https://github.com/conal/talk-2015-haskell-to-hardware</a>>, which<br>
| relies<br>
| > on giving a non-standard but principled interpretation of Haskell<br>
| > programs via a conversion through the language of cartesian closed<br>
| categories (CCCs).<br>
| > The first back-end is hardware generation (e.g., via Verilog), and I<br>
| > have plans for several other CCC-based interpretations.<br>
| ><br>
| > In addition to facilitating my plugin development, hosting in ghci<br>
| > will make it much more pleasant for others to *use* the plugin<br>
| during<br>
| > exploratory programming, just as with ghci use in general. With<br>
| access<br>
| > to unfoldings, users will be able to generate circuit diagrams and<br>
| > Verilog like those in my compiler talk immediately and directly from<br>
| > within ghci. I also intend to make a GPU back-end for fast<br>
| interactive<br>
| > graphics etc, which would be much more fun in ghci than with batch<br>
| compilation.<br>
| > I hope this explanation clarifies my goals and motivation. I hope<br>
| > there’s a way to access unfoldings from ghci currently or with a<br>
| small<br>
| > amount of effort.<br>
| ><br>
| > Regards, - Conal<br>
| ><br>
| > On Sun, Jan 17, 2016 at 7:00 PM, Brandon Allbery<br>
| <<a>allbery.b@gmail.com</a>><br>
| > wrote:<br>
| ><br>
| > > On Sun, Jan 17, 2016 at 9:40 PM, Conal Elliott <<a>conal@conal.net</a>><br>
| wrote:<br>
| > ><br>
| > >> I'm developing a GHC plugin (using HERMIT), and I'd like to use<br>
| > >> ghci to speed up development. I'm able to do so, except that my<br>
| > >> plugin critically needs access to unfoldings, which appear to be<br>
| > >> unavailable in ghci. A little experimenting with ghc shows me<br>
| that<br>
| > >> "-O" is the key, but "-O" is incompatible with "--interactive"<br>
| (as<br>
| > >> in ghci). Is there any way to persuade ghci to make unfoldings<br>
| available?<br>
| > ><br>
| > ><br>
| > > I think unfoldings are only done as part of optimization, and the<br>
| > > bytecode backend doesn't support optimization at all.<br>
| > ><br>
| > > --<br>
| > > brandon s allbery kf8nh sine nomine<br>
| > > associates<br>
| > > <a>allbery.b@gmail.com</a><br>
| > > <a>ballbery@sinenomine.net</a><br>
| > > unix, openafs, kerberos, infrastructure, xmonad<br>
| > ><br>
| <a href="https://na01.safelinks.protection.outlook.com/?url=http%3a%2f%2fsine" target="_blank">https://na01.safelinks.protection.outlook.com/?url=http%3a%2f%2fsine</a><br>
| > ><br>
| <a href="http://nomine.net" target="_blank">nomine.net</a>&data=01%7c01%7csimonpj%<a href="http://40064d.mgd.microsoft.com" target="_blank">40064d.mgd.microsoft.com</a>%7cbaf2ef5<br>
| > ><br>
| 5f8af447b42e608d31fd1cec1%7c72f988bf86f141af91ab2d7cd011db47%7c1&sda<br>
| > > ta=qMNmL5LmkgMp0ebkr6SzPQIwhySqOicZgEdW%2fhe6Q%2b0%3d<br>
| > ><br>
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