[Git][ghc/ghc][master] 5 commits: DynFlags: remove use of sdocWithDynFlags from GHC.Stg.* (#17957)

[Ben Gamari]

Ben Gamari pushed to branch master at Glasgow Haskell Compiler / GHC


Commits:
30caeee7 by Sylvain Henry at 2020-07-21T06:39:33-04:00
DynFlags: remove use of sdocWithDynFlags from GHC.Stg.* (#17957)

* add StgPprOpts datatype
* remove Outputable instances for types that need `StgPprOpts` to be
  pretty-printed and explicitly call type specific ppr functions
* add default `panicStgPprOpts` for panic messages (when it's not
  convenient to thread StgPprOpts or DynFlags down to the ppr function
  call)

- - - - -
863c544c by Mark at 2020-07-21T06:39:34-04:00
Fix a typo in existential_quantification.rst
- - - - -
05910be1 by Krzysztof Gogolewski at 2020-07-21T14:47:07-04:00
Add release notes entry for #17816

[skip ci]

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a6257192 by Matthew Pickering at 2020-07-21T14:47:19-04:00
Use a newtype `Code` for the return type of typed quotations (Proposal #195)

There are three problems with the current API:

1. It is hard to properly write instances for ``Quote m => m (TExp a)`` as the type is the composition
   of two type constructors. Doing so in your program involves making your own newtype and
   doing a lot of wrapping/unwrapping.

   For example, if I want to create a language which I can either run immediately or
   generate code from I could write the following with the new API. ::

      class Lang r where
        _int :: Int -> r Int
        _if  :: r Bool -> r a -> r a -> r a

      instance Lang Identity where
        _int = Identity
        _if (Identity b) (Identity t) (Identity f) = Identity (if b then t else f)

      instance Quote m => Lang (Code m) where
        _int = liftTyped
        _if cb ct cf = [|| if $$cb then $$ct else $$cf ||]

2. When doing code generation it is common to want to store code fragments in
   a map. When doing typed code generation, these code fragments contain a
   type index so it is desirable to store them in one of the parameterised
   map data types such as ``DMap`` from ``dependent-map`` or ``MapF`` from
   ``parameterized-utils``.

   ::

      compiler :: Env -> AST a -> Code Q a

      data AST a where ...
      data Ident a = ...

      type Env = MapF Ident (Code Q)

      newtype Code m a = Code (m (TExp a))

   In this example, the ``MapF`` maps an ``Ident String`` directly to a ``Code Q String``.
   Using one of these map types currently requires creating your own newtype and constantly
   wrapping every quotation and unwrapping it when using a splice. Achievable, but
   it creates even more syntactic noise than normal metaprogramming.

3. ``m (TExp a)`` is ugly to read and write, understanding ``Code m a`` is
   easier. This is a weak reason but one everyone
   can surely agree with.

Updates text submodule.

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58235d46 by Ben Gamari at 2020-07-21T14:47:28-04:00
users-guide: Fix :rts-flag:`--copying-gc` documentation

It was missing a newline.

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30 changed files:

- compiler/GHC/Builtin/Names/TH.hs
- compiler/GHC/CoreToStg.hs
- compiler/GHC/Driver/Main.hs
- compiler/GHC/Stg/DepAnal.hs
- compiler/GHC/Stg/Lift.hs
- compiler/GHC/Stg/Lint.hs
- compiler/GHC/Stg/Pipeline.hs
- compiler/GHC/Stg/Syntax.hs
- compiler/GHC/Stg/Unarise.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Gen/Splice.hs
- docs/users_guide/8.12.1-notes.rst
- docs/users_guide/exts/deriving_extra.rst
- docs/users_guide/exts/existential_quantification.rst
- docs/users_guide/exts/template_haskell.rst
- docs/users_guide/runtime_control.rst
- libraries/template-haskell/Language/Haskell/TH.hs
- + libraries/template-haskell/Language/Haskell/TH/CodeDo.hs
- libraries/template-haskell/Language/Haskell/TH/Lib.hs
- libraries/template-haskell/Language/Haskell/TH/Lib/Internal.hs
- libraries/template-haskell/Language/Haskell/TH/Syntax.hs
- libraries/template-haskell/changelog.md
- libraries/template-haskell/template-haskell.cabal.in
- libraries/text
- testsuite/tests/deriving/should_compile/drv-empty-data.stderr
- testsuite/tests/parser/should_compile/Proposal229f_instances.hs
- testsuite/tests/partial-sigs/should_compile/TypedSplice.hs
- testsuite/tests/partial-sigs/should_compile/TypedSplice.stderr
- testsuite/tests/quotes/T17857.hs
- testsuite/tests/th/T10945.stderr


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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/0dd405529f0f17cd9a5b299e7ae5539a885b4b5a...58235d46bd4e9fbf69bd82969b29cd9c6ab051e1

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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/0dd405529f0f17cd9a5b299e7ae5539a885b4b5a...58235d46bd4e9fbf69bd82969b29cd9c6ab051e1
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