[Git][ghc/ghc][wip/T18470] 11 commits: rts: Add --copying-gc flag to reverse effect of --nonmoving-gc

Tue Jul 21 00:22:09 UTC 2020

Ryan Scott pushed to branch wip/T18470 at Glasgow Haskell Compiler / GHC

Commits:
750a1595 by Ben Gamari at 2020-07-18T07:26:41-04:00
rts: Add --copying-gc flag to reverse effect of --nonmoving-gc

Fixes #18281.

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6ba6a881 by Hécate at 2020-07-18T07:26:42-04:00
Implement `fullCompilerVersion`

Follow-up of https://gitlab.haskell.org/ghc/ghc/-/issues/18403

This MR adds `fullCompilerVersion`, a function that shares the same
backend as the `--numeric-version` GHC flag, exposing a full,
three-digit version datatype.

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e6cf27df by Hécate at 2020-07-18T07:26:43-04:00
Add a Lint hadrian rule and an .hlint.yaml file in base/

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bcb177dd by Simon Peyton Jones at 2020-07-18T07:26:43-04:00
Allow multiple case branches to have a higher rank type

As #18412 points out, it should be OK for multiple case alternatives
to have a higher rank type, provided they are all the same.

This patch implements that change.  It sweeps away
GHC.Tc.Gen.Match.tauifyMultipleBranches, and friends, replacing it
with an enhanced version of fillInferResult.

The basic change to fillInferResult is to permit the case in which
another case alternative has already filled in the result; and in
that case simply unify.  It's very simple actually.

See the new Note [fillInferResult] in TcMType

Other refactoring:

- Move all the InferResult code to one place, in GHC.Tc.Utils.TcMType
  (previously some of it was in Unify)

- Move tcInstType and friends from TcMType to Instantiate, where it
  more properly belongs.  (TCMType was getting very long.)

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e5525a51 by Simon Peyton Jones at 2020-07-18T07:26:43-04:00
Improve typechecking of NPlusK patterns

This patch (due to Richard Eisenberg) improves
documentation of the wrapper returned by tcSubMult
(see Note [Wrapper returned from tcSubMult] in
 GHC.Tc.Utils.Unify).

And, more substantially, it cleans up the multiplicity
handling in the typechecking of NPlusKPat

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12f90352 by Krzysztof Gogolewski at 2020-07-18T07:26:45-04:00
Remove {-# CORE #-} pragma (part of #18048)

This pragma has no effect since 2011.
It was introduced for External Core, which no longer exists.

Updates haddock submodule.

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e504c913 by Simon Peyton Jones at 2020-07-18T07:26:45-04:00
Refactor the simplification of join binders

This MR (for #18449) refactors the Simplifier's treatment
of join-point binders.

Specifically, it puts together, into
     GHC.Core.Opt.Simplify.Env.adjustJoinPointType
two currently-separate ways in which we adjust the type of
a join point. As the comment says:

-- (adjustJoinPointType mult new_res_ty join_id) does two things:
--
--   1. Set the return type of the join_id to new_res_ty
--      See Note [Return type for join points]
--
--   2. Adjust the multiplicity of arrows in join_id's type, as
--      directed by 'mult'. See Note [Scaling join point arguments]

I think this actually fixes a latent bug, by ensuring that the
seIdSubst and seInScope have the right multiplicity on the type
of join points.

I did some tidying up while I was at it.  No more
setJoinResTy, or modifyJoinResTy: instead it's done locally in
Simplify.Env.adjustJoinPointType

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49b265f0 by Chaitanya Koparkar at 2020-07-18T07:26:46-04:00
Fix minor typos in a Core.hs note

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8d59aed6 by Stefan Schulze Frielinghaus at 2020-07-18T07:26:47-04:00
GHCi: Fix isLittleEndian

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c26e81d1 by Ben Gamari at 2020-07-18T07:26:47-04:00
testsuite: Mark ghci tests as fragile under unreg compiler

In particular I have seen T16012 fail repeatedly under the
unregisterised compiler.

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67302db1 by Ryan Scott at 2020-07-20T20:19:29-04:00
Don't mark closed type family equations as occurrences

Previously, `rnFamInstEqn` would mark the name of the type/data
family used in an equation as an occurrence, regardless of what sort
of family it is. Most of the time, this is the correct thing to do.
The exception is closed type families, whose equations constitute its
definition and therefore should not be marked as occurrences.
Overzealously counting the equations of a closed type family as
occurrences can cause certain warnings to not be emitted, as observed
in #18470.

This fixes #18470 with a little bit of extra-casing in
`rnFamInstEqn`. To accomplish this, I added an extra
`ClosedTyFamInfo` field to the `NonAssocTyFamEqn` constructor of
`AssocTyFamInfo` and refactored the relevant call sites accordingly
so that this information is propagated to `rnFamInstEqn`.

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30 changed files:

- compiler/GHC/Core.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Opt/Simplify.hs
- compiler/GHC/Core/Opt/Simplify/Env.hs
- compiler/GHC/Core/TyCo/Rep.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/UsageEnv.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/HsToCore/Binds.hs
- compiler/GHC/HsToCore/Expr.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Lexer.x
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/Match.hs
- compiler/GHC/Tc/Gen/Pat.hs
- compiler/GHC/Tc/Gen/Sig.hs
- compiler/GHC/Tc/Instance/Class.hs
- compiler/GHC/Tc/Instance/Family.hs
- compiler/GHC/Tc/TyCl/Class.hs
- compiler/GHC/Tc/Types/Evidence.hs
- compiler/GHC/Tc/Utils/Env.hs
- compiler/GHC/Tc/Utils/Instantiate.hs
- compiler/GHC/Tc/Utils/TcMType.hs
- compiler/GHC/Tc/Utils/TcType.hs
- compiler/GHC/Tc/Utils/Unify.hs
- docs/users_guide/phases.rst
- docs/users_guide/runtime_control.rst

The diff was not included because it is too large.

View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/791e5887b4fef96e11780de9b96b9ce60dcccb61...67302db115045321d31951a8afe9136440de1e58

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