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

[Harendra Kumar]

GHC has a "--show-iface" option which pretty prints the ".hi" file. Not
sure if it works for your use-case but it may be easier to parse the text
displayed by this option.

-harendra

On 2 December 2017 at 21:29, 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.
>
>
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