Injecting imported functions using a core plugin

[Josef Svenningsson]

Yes, the plugin is fully aware of module A in my example.

Thanks,

Josef

From: "Domínguez, Facundo" <facundo.dominguez at tweag.io>
Date: Tuesday, November 26, 2019 at 11:56 AM
To: Josef Svenningsson <josefs at fb.com>
Cc: "ghc-devs at haskell.org" <ghc-devs at haskell.org>
Subject: Re: Injecting imported functions using a core plugin

Hello Josef,

Do you know the location of foo when building the plugin? Otherwise, how is the plugin supposed to learn where it comes from?

Facundo

On Tue, Nov 26, 2019 at 8:49 AM Josef Svenningsson <josefs at fb.com<mailto:josefs at fb.com>> wrote:
Hi ghc-devs,

I’m currently writing a core plugin that I could use some help with.
Consider the following two modules:

```
module A where

foo :: Int
bar :: Int

module B where

baz :: Int
baz = bar
```

When compiling module B I run my plugin. The goal of the plugin is to replace the occurrence of `bar` with `foo`. Note that we can be sure that `foo` is actually imported, but unfortunately doesn’t occur anywhere in B before the plugin performs the transformation.

The problem I have is that in order to inject `foo` in B I need to have an `Id` which represents `foo` and I’m having some trouble constructing such an `Id`. I’ve looked through the various environments that are available during the core to core transformations but none of them provides enough information to actually produce the `foo` `Id` as far as I can see. I hope I’m missing something. What do I need to do in order to construct the `foo` `Id` in module B?

Thanks,

Josef

PS. The way I’ve phrased my problem in this email it would be possible to solve it with rewrite rules. My actual use case is unfortunately more complicated and rewrite rules don’t provide enough power to do what I want.
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