I've checked the source code of GHC's simplifier. Regarding the eta expansion and lambda lifting it seems (according the comments) it does not guarantee to make these transformations in every case.
If GHC can transform the Core representation to supercombinators, which transformation sould I use from CoreToDo?
https://github.com/ghc/ghc/blob/master/compiler/simplCore/CoreMonad.hs#L107-L135

Maybe I should give more details:
I'd like to use GHC as a frontend for my custom code generator which can handle (lazy) top level functions only.
Is it better to use GHC as a library or is it better to write a compiler plugin to capture the core representation.
I do not want to optimize the Core at all neither want to use other parts of GHC's backend (i.e. codegen).
Ideally GHC would typecheck and transform everything to top level function and my system would do the rest.

Do you know what would be the easiest way to do this? (i.e. via CoreToDo or custom calls for the simplifying functions)

Regards,
Csaba Hruska

On Mon, Apr 9, 2018 at 9:11 PM, Shao Cheng <astrohavoc@gmail.com> wrote:
Hi Csaba,

The transformations you described already exist as core simplifier passes. For custom compilation, you may write your own pass using the core plugin mechanism, see https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/extending_ghc.html#compiler-plugins

It's also possible to perform transformations on STG, but it takes extra effort to retrieve/transform the in-memory STG representations, and type safety is also not guaranteed.

Regards,
Shao Cheng

On Tue, Apr 10, 2018 at 2:51 AM, Csaba Hruska <csaba.hruska@gmail.com> wrote:
Hello,

I wonder what is the easiest way to compile Haskell to supercombinators (top level functions) using GHC as a library.

Is it possible to use GHC simplifier to transform the parsed Haskell source to supercombinators? i.e. to do
  • eta expansion
  • closure conversion
  • lambda lifting
Or should it be written from scratch?

Is Core or STG suited better for this purpose?

Thanks,
Csaba

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