[Git][ghc/ghc][wip/T18086] 23 commits: docs: fix formatting and add some links

Sebastian Graf gitlab at gitlab.haskell.org
Mon May 25 16:55:41 UTC 2020 


Sebastian Graf pushed to branch wip/T18086 at Glasgow Haskell Compiler / GHC


Commits:
d830bbc9 by Adam Sandberg Ericsson at 2020-05-23T13:36:20-04:00
docs: fix formatting and add some links

[skip ci]

- - - - -
49301ad6 by Andrew Martin at 2020-05-23T13:37:01-04:00
Implement cstringLength# and FinalPtr

This function and its accompanying rule resolve issue #5218.
A future PR to the bytestring library will make the internal
Data.ByteString.Internal.unsafePackAddress compute string length
with cstringLength#. This will improve the status quo because it is
eligible for constant folding.

Additionally, introduce a new data constructor to ForeignPtrContents
named FinalPtr. This additional data constructor, when used in the
IsString instance for ByteString, leads to more Core-to-Core
optimization opportunities, fewer runtime allocations, and smaller
binaries.

Also, this commit re-exports all the functions from GHC.CString
(including cstringLength#) in GHC.Exts. It also adds a new test
driver. This test driver is used to perform substring matches on Core
that is dumped after all the simplifier passes. In this commit, it is
used to check that constant folding of cstringLength# works.

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dcd6bdcc by Ben Gamari at 2020-05-23T13:37:48-04:00
simplCore: Ignore ticks in rule templates

This fixes #17619, where a tick snuck in to the template of a rule,
resulting in a panic during rule matching. The tick in question was
introduced via post-inlining, as discussed in `Note [Simplifying
rules]`. The solution we decided upon was to simply ignore ticks in the
rule template, as discussed in `Note [Tick annotations in RULE
matching]`.

Fixes #18162.
Fixes #17619.

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82cb8913 by John Ericson at 2020-05-23T13:38:32-04:00
Fix #18145 and also avoid needless work with implicit vars

 - `forAllOrNothing` now is monadic, so we can trace whether we bind
   an explicit `forall` or not.

 - #18145 arose because the free vars calculation was needlessly
   complex. It is now greatly simplified.

 - Replaced some other implicit var code with `filterFreeVarsToBind`.

Co-authored-by: Ryan Scott <ryan.gl.scott at gmail.com>

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a60dc835 by Ben Gamari at 2020-05-23T13:39:12-04:00
Bump process submodule

Fixes #17926.

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856adf54 by Ben Gamari at 2020-05-23T13:40:21-04:00
users-guide: Clarify meaning of -haddock flag

Fixes #18206.

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7ae57afd by Ben Gamari at 2020-05-23T13:41:03-04:00
git: Add ignored commits file

This can be used to tell git to ignore bulk renaming commits like the
recently-finished module hierarchy refactoring. Configured with,

    git config blame.ignoreRevsFile .git-ignore-revs

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63d30e60 by jneira at 2020-05-24T01:54:42-04:00
Add hie-bios script for windows systems
It is a direct translation of the sh script

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59182b88 by jneira at 2020-05-24T01:54:42-04:00
Honour previous values for CABAL and CABFLAGS
The immediate goal is let the hie-bios.bat script
set CABFLAGS with `-v0` and remove all cabal output
except the compiler arguments

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932dc54e by jneira at 2020-05-24T01:54:42-04:00
Add specific configuration for windows in hie.yaml

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e0eda070 by jneira at 2020-05-24T01:54:42-04:00
Remove not needed hie-bios output

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a0ea59d6 by Sylvain Henry at 2020-05-24T01:55:24-04:00
Move Config module into GHC.Settings

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37430251 by Sylvain Henry at 2020-05-24T01:55:24-04:00
Rename GHC.Core.Arity into GHC.Core.Opt.Arity

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a426abb9 by Sylvain Henry at 2020-05-24T01:55:24-04:00
Rename GHC.Hs.Types into GHC.Hs.Type

See discussion in https://gitlab.haskell.org/ghc/ghc/issues/13009#note_268610

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1c91a7a0 by Sylvain Henry at 2020-05-24T01:55:24-04:00
Bump haddock submodule

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66bd24d1 by Ryan Scott at 2020-05-24T01:56:03-04:00
Add orderingTyCon to wiredInTyCons (#18185)

`Ordering` needs to be wired in for use in the built-in `CmpNat` and
`CmpSymbol` type families, but somehow it was never added to the list
of `wiredInTyCons`, leading to the various oddities observed
in #18185. Easily fixed by moving `orderingTyCon` from
`basicKnownKeyNames` to `wiredInTyCons`.

Fixes #18185.

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01c43634 by Matthew Pickering at 2020-05-24T01:56:42-04:00
Remove unused hs-boot file

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7a07aa71 by Sylvain Henry at 2020-05-24T15:22:17-04:00
Hadrian: fix cross-compiler build (#16051)

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15ccca16 by Sylvain Henry at 2020-05-24T15:22:17-04:00
Hadrian: fix distDir per stage

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b420fb24 by Sylvain Henry at 2020-05-24T15:22:17-04:00
Hadrian: fix hp2ps error during cross-compilation

Fixed by @alp (see https://gitlab.haskell.org/ghc/ghc/issues/16051#note_274265)

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cd339ef0 by Joshua Price at 2020-05-24T15:22:56-04:00
Make Unicode brackets opening/closing tokens (#18225)

The tokens `[|`, `|]`, `(|`, and `|)` are opening/closing tokens as
described in GHC Proposal #229. This commit makes the unicode
variants (`⟦`, `⟧`, `⦇`, and `⦈`) act the same as their ASCII
counterparts.

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53b5cb9a by Sebastian Graf at 2020-05-25T18:55:18+02:00
FloatOut: Only eta-expand dead-end RHS if arity will increase (#18231)

Otherwise we risk turning trivial RHS into non-trivial RHS, introducing
unnecessary bindings in the next Simplifier run, resulting in more
churn.

Fixes #18231.

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7ec8ea61 by Sebastian Graf at 2020-05-25T18:55:24+02:00
DmdAnal: Recognise precise exceptions from case alternatives (#18086)

Consider

```hs
m :: IO ()
m = do
  putStrLn "foo"
  error "bar"
```

`m` (from #18086) always throws a (precise or imprecise) exception or
diverges. Yet demand analysis infers `<L,A>` as demand signature instead
of `<L,A>x` for it.

That's because the demand analyser sees `putStrLn` occuring in a case
scrutinee and decides that it has to `deferAfterPreciseException`,
because `putStrLn` throws a precise exception on some control flow
paths. This will mask the `botDiv` `Divergence`of the single case alt
containing `error` to `topDiv`. Since `putStrLn` has `topDiv` itself,
the final `Divergence` is `topDiv`.

This is easily fixed: `deferAfterPreciseException` works by `lub`ing
with the demand type of a virtual case branch denoting the precise
exceptional control flow. We used `nopDmdType` before, but we can be
more precise and use `exnDmdType`, which is `nopDmdType` with `exnDiv`.

Now the `Divergence` from the case alt will degrade `botDiv` to `exnDiv`
instead of `topDiv`, which combines with the result from the scrutinee
to `exnDiv`, and all is well.

Fixes #18086.

- - - - -


30 changed files:

- + .git-ignore-revs
- compiler/GHC/Builtin/Names.hs
- − compiler/GHC/Builtin/Names.hs-boot
- compiler/GHC/Builtin/Types.hs
- compiler/GHC/CmmToAsm.hs
- compiler/GHC/CmmToAsm/Dwarf.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Arity.hs → compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/CallArity.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/Opt/DmdAnal.hs
- compiler/GHC/Core/Opt/FloatOut.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
- compiler/GHC/Core/Opt/SetLevels.hs
- compiler/GHC/Core/Opt/Simplify.hs
- compiler/GHC/Core/Opt/Simplify/Utils.hs
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Core/Opt/WorkWrap.hs
- compiler/GHC/Core/Rules.hs
- compiler/GHC/Core/SimpleOpt.hs
- compiler/GHC/Core/Unfold.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToStg.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/Data/FastString.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Hs.hs
- compiler/GHC/Hs/Binds.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Expr.hs


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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/5205b85a058b0ae88a76cba9932b159da9296511...7ec8ea61215e66e5513a284b9395ad5e2c639d98

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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/5205b85a058b0ae88a76cba9932b159da9296511...7ec8ea61215e66e5513a284b9395ad5e2c639d98
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