[Git][ghc/ghc][wip/T24676] 18 commits: Refactor the Binary serialisation interface

Tue Apr 30 14:48:29 UTC 2024

Simon Peyton Jones pushed to branch wip/T24676 at Glasgow Haskell Compiler / GHC

Commits:
fa03b1fb by Fendor at 2024-04-26T18:03:13-04:00
Refactor the Binary serialisation interface

The goal is simplifiy adding deduplication tables to `ModIface`
interface serialisation.

We identify two main points of interest that make this difficult:

1. UserData hardcodes what `Binary` instances can have deduplication
   tables. Moreover, it heavily uses partial functions.
2. GHC.Iface.Binary hardcodes the deduplication tables for 'Name' and
   'FastString', making it difficult to add more deduplication.

Instead of having a single `UserData` record with fields for all the
types that can have deduplication tables, we allow to provide custom
serialisers for any `Typeable`.
These are wrapped in existentials and stored in a `Map` indexed by their
respective `TypeRep`.
The `Binary` instance of the type to deduplicate still needs to
explicitly look up the decoder via `findUserDataReader` and
`findUserDataWriter`, which is no worse than the status-quo.

`Map` was chosen as microbenchmarks indicate it is the fastest for a
small number of keys (< 10).

To generalise the deduplication table serialisation mechanism, we
introduce the types `ReaderTable` and `WriterTable` which provide a
simple interface that is sufficient to implement a general purpose
deduplication mechanism for `writeBinIface` and `readBinIface`.

This allows us to provide a list of deduplication tables for
serialisation that can be extended more easily, for example for
`IfaceTyCon`, see the issue https://gitlab.haskell.org/ghc/ghc/-/issues/24540
for more motivation.

In addition to this refactoring, we split `UserData` into `ReaderUserData`
and `WriterUserData`, to avoid partial functions and reduce overall
memory usage, as we need fewer mutable variables.

Bump haddock submodule to accomodate for `UserData` split.

-------------------------
Metric Increase:
    MultiLayerModulesTH_Make
    MultiLayerModulesRecomp
    T21839c
-------------------------

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bac57298 by Fendor at 2024-04-26T18:03:13-04:00
Split `BinHandle` into `ReadBinHandle` and `WriteBinHandle`

A `BinHandle` contains too much information for reading data.
For example, it needs to keep a `FastMutInt` and a `IORef BinData`,
when the non-mutable variants would suffice.

Additionally, this change has the benefit that anyone can immediately
tell whether the `BinHandle` is used for reading or writing.

Bump haddock submodule BinHandle split.

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4d6394dd by Simon Peyton Jones at 2024-04-26T18:03:49-04:00
Fix missing escaping-kind check in tcPatSynSig

Note [Escaping kind in type signatures] explains how we deal
with escaping kinds in type signatures, e.g.
    f :: forall r (a :: TYPE r). a
where the kind of the body is (TYPE r), but `r` is not in
scope outside the forall-type.

I had missed this subtlety in tcPatSynSig, leading to #24686.
This MR fixes it; and a similar bug in tc_top_lhs_type. (The
latter is tested by T24686a.)

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981c2c2c by Alan Zimmerman at 2024-04-26T18:04:25-04:00
EPA: check-exact: check that the roundtrip reproduces the source

Closes #24670

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a8616747 by Andrew Lelechenko at 2024-04-26T18:05:01-04:00
Document that setEnv is not thread-safe

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1e41de83 by Bryan Richter at 2024-04-26T18:05:37-04:00
CI: Work around frequent Signal 9 errors

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a6d5f9da by Naïm Favier at 2024-04-27T17:52:40-04:00
ghc-internal: add MonadFix instance for (,)

Closes https://gitlab.haskell.org/ghc/ghc/-/issues/24288, implements CLC
proposal https://github.com/haskell/core-libraries-committee/issues/238.

Adds a MonadFix instance for tuples, permitting value recursion in the
"native" writer monad and bringing consistency with the existing
instance for transformers's WriterT (and, to a lesser extent, for Solo).

- - - - -
64feadcd by Rodrigo Mesquita at 2024-04-27T17:53:16-04:00
bindist: Fix xattr cleaning

The original fix (725343aa) was incorrect because it used the shell
bracket syntax which is the quoting syntax in autoconf, making the test
for existence be incorrect and therefore `xattr` was never run.

Fixes #24554

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e2094df3 by damhiya at 2024-04-28T23:52:00+09:00
Make read accepts binary integer formats

CLC proposal : https://github.com/haskell/core-libraries-committee/issues/177

- - - - -
1c2fd963 by Alan Zimmerman at 2024-04-29T23:17:00-04:00
EPA: Preserve comments in Match Pats

Closes #24708
Closes #24715
Closes #24734

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4189d17e by Sylvain Henry at 2024-04-29T23:17:42-04:00
LLVM: better unreachable default destination in Switch (#24717)

See added note.

Co-authored-by: Siddharth Bhat <siddu.druid at gmail.com>

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a3725c88 by Cheng Shao at 2024-04-29T23:18:20-04:00
ci: enable wasm jobs for MRs with wasm label

This patch enables wasm jobs for MRs with wasm label. Previously the
wasm label didn't actually have any effect on the CI pipeline, and
full-ci needed to be applied to run wasm jobs which was a waste of
runners when working on the wasm backend, hence the fix here.

- - - - -
702f7964 by Matthew Pickering at 2024-04-29T23:18:56-04:00
Make interface files and object files depend on inplace .conf file

A potential fix for #24737

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728af21e by Cheng Shao at 2024-04-30T05:30:23-04:00
utils: remove obsolete vagrant scripts

Vagrantfile has long been removed in !5288. This commit further
removes the obsolete vagrant scripts in the tree.

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36f2c342 by Cheng Shao at 2024-04-30T05:31:00-04:00
Update autoconf scripts

Scripts taken from autoconf 948ae97ca5703224bd3eada06b7a69f40dd15a02

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ecbf22a6 by Ben Gamari at 2024-04-30T05:31:36-04:00
ghcup-metadata: Drop output_name field

This is entirely redundant to the filename of the URL. There is no
compelling reason to name the downloaded file differently from its
source.

- - - - -
78cdaaae by Simon Peyton Jones at 2024-04-30T15:47:50+01:00
Fix a QuickLook bug

This MR fixes the bug exposed by #24676.  The problem was that
quickLookArg was trying to avoid calling tcInstFun unnecessarily; but
it was in fact necessary.  But that in turn forced me into a
significant refactoring, putting more fields into EValArgQL.

I added a lot of new material to
  Note [Quick Look at value arguments]

It is a bit more subtle than I would like, but the overall plan
is rather clearer now than it was.

- - - - -
5f69ac07 by Simon Peyton Jones at 2024-04-30T15:47:50+01:00
More responses to Richard's review

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29 changed files:

- .gitlab-ci.yml
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/jobs.yaml
- .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/Core/TyCo/FVs.hs
- compiler/GHC/Iface/Binary.hs
- compiler/GHC/Iface/Ext/Binary.hs
- compiler/GHC/Iface/Ext/Fields.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Recomp/Binary.hs
- compiler/GHC/Iface/Recomp/Flags.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Type.hs
- compiler/GHC/Parser/Annotation.hs
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/StgToJS/Object.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/Head.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Gen/Match.hs
- compiler/GHC/Tc/Gen/Sig.hs
- compiler/GHC/Tc/Utils/TcMType.hs
- compiler/GHC/Tc/Utils/TcType.hs
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Types/Basic.hs
- compiler/GHC/Types/FieldLabel.hs
- compiler/GHC/Types/Name.hs

The diff was not included because it is too large.

View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/ac999ca4e4ecda1bd6e8077ccfff4fdbca50b0b5...5f69ac0796979ad04ef536b7e8de0643f2cc1dc7

-- 
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/ac999ca4e4ecda1bd6e8077ccfff4fdbca50b0b5...5f69ac0796979ad04ef536b7e8de0643f2cc1dc7
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