[Git][ghc/ghc][wip/T22404] 49 commits: Refresh profiling docs

Sun Feb 19 19:41:09 UTC 2023

Simon Peyton Jones pushed to branch wip/T22404 at Glasgow Haskell Compiler / GHC

Commits:
1e9eac1c by Matthew Pickering at 2023-02-13T11:36:41+01:00
Refresh profiling docs

I went through the whole of the profiling docs and tried to amend them
to reflect current best practices and tooling. In particular I removed
some old references to tools such as hp2any and replaced them with
references to eventlog2html.

- - - - -
da208b9a by Matthew Pickering at 2023-02-13T11:36:41+01:00
docs: Add section about profiling and foreign calls

Previously there was no documentation for how foreign calls interacted
with the profiler. This can be quite confusing for users so getting it
into the user guide is the first step to a potentially better solution.
See the ticket for more insightful discussion.

Fixes #21764

- - - - -
081640f1 by Bodigrim at 2023-02-13T12:51:52-05:00
Document that -fproc-alignment was introduced only in GHC 8.6

- - - - -
16adc349 by Sven Tennie at 2023-02-14T11:26:31-05:00
Add clangd flag to include generated header files

This enables clangd to correctly check C files that import Rts.h.
(The added include directory contains ghcautoconf.h et. al.)

- - - - -
c399ccd9 by amesgen at 2023-02-14T11:27:14-05:00
Mention new `Foreign.Marshal.Pool` implementation in User's Guide

- - - - -
b9282cf7 by Ben Gamari at 2023-02-14T11:27:50-05:00
upload_ghc_libs: More control over which packages to operate on

Here we add a `--skip` flag to `upload_ghc_libs`, making it easier to
limit which packages to upload. This is often necessary when one package
is not uploadable (e.g. see #22740).

- - - - -
aa3a262d by PHO at 2023-02-14T11:28:29-05:00
Assume platforms support rpaths if they use either ELF or Mach-O

Not only Linux, Darwin, and FreeBSD support rpaths. Determine the usability
of rpaths based on the object format, not on OS.

- - - - -
47716024 by PHO at 2023-02-14T11:29:09-05:00
RTS linker: Improve compatibility with NetBSD

1. Hint address to NetBSD mmap(2) has a different semantics from that of
   Linux. When a hint address is provided, mmap(2) searches for a free
   region at or below the hint but *never* above it. This means we can't
   reliably search for free regions incrementally on the userland,
   especially when ASLR is enabled. Let the kernel do it for us if we don't
   care where the mapped address is going to be.

2. NetBSD not only hates to map pages as rwx, but also disallows to switch
   pages from rw- to r-x unless the intention is declared when pages are
   initially requested. This means we need a new MemoryAccess mode for
   pages that are going to be changed to r-x.

- - - - -
11de324a by Li-yao Xia at 2023-02-14T11:29:49-05:00
base: Move changelog entry to its place

- - - - -
75930424 by Ben Gamari at 2023-02-14T11:30:27-05:00
nativeGen/AArch64: Emit Atomic{Read,Write} inline

Previously the AtomicRead and AtomicWrite operations were emitted as
out-of-line calls. However, these tend to be very important for
performance, especially the RELAXED case (which only exists for
ThreadSanitizer checking).

Fixes #22115.

- - - - -
d6411d6c by Andreas Klebinger at 2023-02-14T11:31:04-05:00
Fix some correctness issues around tag inference when targeting the bytecode generator.

* Let binders are now always assumed untagged for bytecode.
* Imported referenced are now always assumed to be untagged for bytecode.

Fixes #22840

- - - - -
9fb4ca89 by sheaf at 2023-02-14T11:31:49-05:00
Introduce warning for loopy superclass solve

Commit aed1974e completely re-engineered the treatment of loopy
superclass dictionaries in instance declarations. Unfortunately,
it has the potential to break (albeit in a rather minor way) user code.

To alleviate migration concerns, this commit re-introduces the old
behaviour. Any reliance on this old behaviour triggers a warning,
controlled by `-Wloopy-superclass-solve`. The warning text explains
that GHC might produce bottoming evidence, and provides a migration
strategy.

This allows us to provide a graceful migration period, alerting users
when they are relying on this unsound behaviour.

Fixes #22912 #22891 #20666 #22894 #22905

- - - - -
1928c7f3 by Cheng Shao at 2023-02-14T11:32:26-05:00
rts: make it possible to change mblock size on 32-bit targets

The MBLOCK_SHIFT macro must be the single source of truth for defining
the mblock size, and changing it should only affect performance, not
correctness. This patch makes it truly possible to reconfigure mblock
size, at least on 32-bit targets, by fixing places which implicitly
relied on the previous MBLOCK_SHIFT constant. Fixes #22901.

- - - - -
78aa3b39 by Simon Hengel at 2023-02-14T11:33:06-05:00
Update outdated references to notes

- - - - -
e8baecd2 by meooow25 at 2023-02-14T11:33:49-05:00
Documentation: Improve Foldable1 documentation

* Explain foldrMap1, foldlMap1, foldlMap1', and foldrMap1' in greater
  detail, the text is mostly adapted from documentation of Foldable.
* Describe foldr1, foldl1, foldl1' and foldr1' in terms of the above
  functions instead of redoing the full explanation.
* Small updates to documentation of fold1, foldMap1 and toNonEmpty,
  again adapting from Foldable.
* Update the foldMap1 example to lists instead of Sum since this is
  recommended for lazy right-associative folds.

Fixes #22847

- - - - -
85a1a575 by romes at 2023-02-14T11:34:25-05:00
fix: Mark ghci Prelude import as implicit

Fixes #22829

In GHCi, we were creating an import declaration for Prelude but we were
not setting it as an implicit declaration. Therefore, ghci's import of
Prelude triggered -Wmissing-import-lists.

Adds regression test T22829 to testsuite

- - - - -
3b019a7a by Cheng Shao at 2023-02-14T11:35:03-05:00
compiler: fix generateCgIPEStub for no-tables-next-to-code builds

generateCgIPEStub already correctly implements the CmmTick finding
logic for when tables-next-to-code is on/off, but it used the wrong
predicate to decide when to switch between the two. Previously it
switches based on whether the codegen is unregisterised, but there do
exist registerised builds that disable tables-next-to-code! This patch
corrects that problem. Fixes #22896.

- - - - -
08c0822c by doyougnu at 2023-02-15T00:16:39-05:00
docs: release notes, user guide: add js backend

Follow up from #21078

- - - - -
79d8fd65 by Bryan Richter at 2023-02-15T00:17:15-05:00
Allow failure in nightly-x86_64-linux-deb10-no_tntc-validate

See #22343

- - - - -
9ca51f9e by Cheng Shao at 2023-02-15T00:17:53-05:00
rts: add the rts_clearMemory function

This patch adds the rts_clearMemory function that does its best to
zero out unused RTS memory for a wasm backend use case. See the
comment above rts_clearMemory() prototype declaration for more
detailed explanation. Closes #22920.

- - - - -
26df73fb by Oleg Grenrus at 2023-02-15T22:20:57-05:00
Add -single-threaded flag to force single threaded rts

This is the small part of implementing
https://github.com/ghc-proposals/ghc-proposals/pull/240

- - - - -
631c6c72 by Cheng Shao at 2023-02-16T06:43:09-05:00
docs: add a section for the wasm backend

Fixes #22658

- - - - -
1878e0bd by Bryan Richter at 2023-02-16T06:43:47-05:00
tests: Mark T12903 fragile everywhere

See #21184

- - - - -
b9420eac by Bryan Richter at 2023-02-16T06:43:47-05:00
Mark all T5435 variants as fragile

See #22970.

- - - - -
df3d94bd by Sylvain Henry at 2023-02-16T06:44:33-05:00
Testsuite: mark T13167 as fragile for JS (#22921)

- - - - -
324e925b by Sylvain Henry at 2023-02-16T06:45:15-05:00
JS: disable debugging info for heap objects

- - - - -
518af814 by Josh Meredith at 2023-02-16T10:16:32-05:00
Factor JS Rts generation for h$c{_,0,1,2} into h$c{n} and improve name caching

- - - - -
34cd308e by Ben Gamari at 2023-02-16T10:17:08-05:00
base: Note move of GHC.Stack.CCS.whereFrom to GHC.InfoProv in changelog

Fixes #22883.

- - - - -
12965aba by Simon Peyton Jones at 2023-02-16T10:17:46-05:00
Narrow the dont-decompose-newtype test

Following #22924 this patch narrows the test that stops
us decomposing newtypes.  The key change is the use of
noGivenNewtypeReprEqs in GHC.Tc.Solver.Canonical.canTyConApp.

We went to and fro on the solution, as you can see in #22924.
The result is carefully documented in
  Note [Decomoposing newtype equalities]

On the way I had revert most of
  commit 3e827c3f74ef76d90d79ab6c4e71aa954a1a6b90
  Author: Richard Eisenberg <rae at cs.brynmawr.edu>
  Date:   Mon Dec 5 10:14:02 2022 -0500

    Do newtype unwrapping in the canonicaliser and rewriter

    See Note [Unwrap newtypes first], which has the details.

It turns out that

(a) 3e827c3f makes GHC behave worse on some recursive newtypes
    (see one of the tests on this commit)
(b) the finer-grained test (namely noGivenNewtypeReprEqs) renders
    3e827c3f unnecessary

- - - - -
5b038888 by Bodigrim at 2023-02-16T10:18:24-05:00
Documentation: add an example of SPEC usage

- - - - -
681e0e8c by sheaf at 2023-02-16T14:09:56-05:00
No default finalizer exception handler

Commit cfc8e2e2 introduced a mechanism for handling of exceptions
that occur during Handle finalization, and 372cf730 set the default
handler to print out the error to stderr.

However, #21680 pointed out we might not want to set this by default,
as it might pollute users' terminals with unwanted information.
So, for the time being, the default handler discards the exception.

Fixes #21680

- - - - -
b3ac17ad by Matthew Pickering at 2023-02-16T14:10:31-05:00
unicode: Don't inline bitmap in generalCategory

generalCategory contains a huge literal string but is marked INLINE,
this will duplicate the string into any use site of generalCategory. In
particular generalCategory is used in functions like isSpace and the
literal gets inlined into this function which makes it massive.

https://github.com/haskell/core-libraries-committee/issues/130

Fixes #22949

-------------------------
Metric Decrease:
    T4029
    T18304
-------------------------

- - - - -
8988eeef by sheaf at 2023-02-16T20:32:27-05:00
Expand synonyms in RoughMap

We were failing to expand type synonyms in the function
GHC.Core.RoughMap.typeToRoughMatchLookupTc, even though the
RoughMap infrastructure crucially relies on type synonym expansion
to work.

This patch adds the missing type-synonym expansion.

Fixes #22985

- - - - -
3dd50e2f by Matthew Pickering at 2023-02-16T20:33:03-05:00
ghcup-metadata: Add test artifact

Add the released testsuite tarball to the generated ghcup metadata.

- - - - -
c6a967d9 by Matthew Pickering at 2023-02-16T20:33:03-05:00
ghcup-metadata: Use Ubuntu and Rocky bindists

Prefer to use the Ubuntu 20.04 and 18.04 binary distributions on Ubuntu
and Linux Mint. Prefer to use the Rocky 8 binary distribution on
unknown distributions.

- - - - -
be0b7209 by Matthew Pickering at 2023-02-17T09:37:16+00:00
Add INLINABLE pragmas to `generic*` functions in Data.OldList

These functions are

* recursive
* overloaded

So it's important to add an `INLINABLE` pragma to each so that they can be
specialised at the use site when the specific numeric type is known.
Adding these pragmas improves the LazyText replicate benchmark (see https://gitlab.haskell.org/ghc/ghc/-/issues/22886#note_481020)

https://github.com/haskell/core-libraries-committee/issues/129

- - - - -
a203ad85 by Sylvain Henry at 2023-02-17T15:59:16-05:00
Merge libiserv with ghci

`libiserv` serves no purpose. As it depends on `ghci` and doesn't have
more dependencies than the `ghci` package, its code could live in the
`ghci` package too.

This commit also moves most of the code from the `iserv` program into
the `ghci` package as well so that it can be reused. This is especially
useful for the implementation of TH for the JS backend (#22261, !9779).

- - - - -
b5f1fd54 by Simon Peyton Jones at 2023-02-19T19:40:57+00:00
Work in progress on #22404

Very much not ready!

- - - - -
f1e6b5e4 by Sebastian Graf at 2023-02-19T19:40:57+00:00
Partition into OneOccs and ManyOccs

- - - - -
7267a5a0 by Simon Peyton Jones at 2023-02-19T19:40:57+00:00
Wibbles

- - - - -
b3cb11cc by Simon Peyton Jones at 2023-02-19T19:40:57+00:00
Refactor WithTailJoinDetails

- - - - -
7a8f71eb by Simon Peyton Jones at 2023-02-19T19:40:57+00:00
Wibbles

- - - - -
33f336fb by Simon Peyton Jones at 2023-02-19T19:40:57+00:00
Wibbles

- - - - -
0fd7b754 by Simon Peyton Jones at 2023-02-19T19:40:57+00:00
Major wibbles

- - - - -
b2c1b354 by Simon Peyton Jones at 2023-02-19T19:40:57+00:00
Wibble

- - - - -
9bae69eb by Simon Peyton Jones at 2023-02-19T19:40:57+00:00
Vital fix to alt_env

- - - - -
919e97c3 by Simon Peyton Jones at 2023-02-19T19:40:57+00:00
Comments

- - - - -
91098750 by Simon Peyton Jones at 2023-02-19T19:40:57+00:00
Another crucial change

Fixing a wrongly-zapped occ_join_points
..and a DEBUG check to catch it if it happens again

- - - - -
0b3f6a25 by Simon Peyton Jones at 2023-02-19T19:40:57+00:00
Fast path for addInScope

- - - - -

30 changed files:

- .gitlab-ci.yml
- .gitlab/gen_ci.hs
- .gitlab/jobs.yaml
- .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
- .gitlab/rel_eng/upload_ghc_libs.py
- CODEOWNERS
- cabal.project-reinstall
- compile_flags.txt
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/AArch64/Instr.hs
- compiler/GHC/CmmToAsm/AArch64/Ppr.hs
- compiler/GHC/Core/DataCon.hs
- compiler/GHC/Core/Opt/DmdAnal.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
- compiler/GHC/Core/RoughMap.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Driver/Config/Stg/Pipeline.hs
- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Driver/GenerateCgIPEStub.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Hs/Binds.hs
- compiler/GHC/Hs/ImpExp.hs
- compiler/GHC/JS/Make.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Lexer.x
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Stg/InferTags.hs
- compiler/GHC/Stg/InferTags/Types.hs
- compiler/GHC/Stg/Pipeline.hs
- compiler/GHC/StgToJS/Closure.hs

The diff was not included because it is too large.

View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/66c44df2b01fc5ba27e17991caaf1e84c4746b8b...0b3f6a25fda786d936331e547b4667168add4037

-- 
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/66c44df2b01fc5ba27e17991caaf1e84c4746b8b...0b3f6a25fda786d936331e547b4667168add4037
You're receiving this email because of your account on gitlab.haskell.org.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.haskell.org/pipermail/ghc-commits/attachments/20230219/51ba9834/attachment-0001.html>