Source locations from Core

[Matthew Pickering]

Hi Gergo,

Source Notes are what you are looking for. Currently the only way to
enable them is to either use `-g` or `-finfo-table-map`. The result
will be core which contains nodes which attempt to describe where the
core expression came from, it's not perfect though!

See Section 5.4 - https://etheses.whiterose.ac.uk/8321/1/thesis.pdf

Matt

On Tue, Dec 28, 2021 at 9:14 AM Erdi, Gergo via ghc-devs
<ghc-devs at haskell.org> wrote:
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> PUBLIC
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> Hi,
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> I’m looking for ways to map Core fragments back to source locations.
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> I see there is an annotated version of Core in `GHC/Core.hs` called `AnnExpr`, which I could see being useful for this if I set the annotation type to `SrcSpan`, but that’s not what I get out of GHC’s desugarer, simplifier or tidier.
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> If there’s no built-in mechanism for this, my only idea would be to create a HsExpr-to-HsExpr transformation that wraps every node in a call that is opaque enough to be persisted through Core-to-Core transformations but still transparent enough that it doesn’t block optimization opportunities. Is that even possible?
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> Alternatively, would it make it easer if I was content with only getting source locations for variable occurrences?
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> Thanks,
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>            Gergo
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>
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