How to load & parse an HI (interface) file?

[Brandon Allbery]

I would be cautious about using the ghc-api hi file interfaces; hi files
turn out to interact with a lot of low-level parts in complex ways (even to
the extent that they're a large part of why ghc can't parallelize builds
itself and attempts to change that have mostly failed).

But if you must do this, you *really* want to have
https://ghc.haskell.org/trac/ghc/wiki/Commentary/Compiler ready to hand ---
and go through it first so you have some idea of how it works; much of it
is links to the lower level details (often straight into the source).

On Sat, Dec 2, 2017 at 10:59 AM, Saurabh Nanda <saurabhnanda at gmail.com>
wrote:

> (GHC newbie alert -- is this the right mailing list for these kind of
> questions?)
>
> I"m writing some code to figure out all the instances of particular
> type-classes and after exploring a lot of options (hlint, haskell-src-exts,
> annotations, doctests, etc), I realized that the compiler had already
> figured it out and written it to disk for me!
>
> More digging led me to https://www.stackage.org/haddock/lts-9.0/ghc-8.0.2/
> LoadIface.html#v:loadSrcInterface after which I got stuck. How does one
> call this function? Specifically:
>
> * What is SDoc and how to construct a reasonable value for this argument?
> * IsBootInterface would mostly be False, right?
> * What does `Maybe FastString` represent and how does one construct it?
> * Finally how does one evaluate the resulting monadic action to get access
> to the underlying `ModIface`?
>
> -- Saurabh.
>
>
> _______________________________________________
> ghc-devs mailing list
> ghc-devs at haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
>
>


-- 
brandon s allbery kf8nh                               sine nomine associates
allbery.b at gmail.com                                  ballbery at sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.haskell.org/pipermail/ghc-devs/attachments/20171202/9be0ee20/attachment.html>