-
30f442a9
by Teo Camarasu at 2026-01-20T13:57:26-05:00
base: don't expose GHC.Num.{BigNat, Integer, Natural}
We no longer expose GHC.Num.{BigNat, Integer, Natural} from base instead users should get these modules from ghc-bignum.
We make this change to insulate end users from changes to GHC's implementation of big numbers.
Implements CLC proposal 359: https://github.com/haskell/core-libraries-committee/issues/359
-
75a9053d
by Teo Camarasu at 2026-01-20T13:58:07-05:00
base: deprecate GHC internals in GHC.Num
Implements CLC proposal: https://github.com/haskell/core-libraries-committee/issues/360
-
9534b032
by Andreas Klebinger at 2026-01-20T13:58:50-05:00
ghc-experimental: Update Changelog
I tried to reconstruct a high level overview of the changes and when
they were made since we introduced it.
Fixes #26506
Co-authored-by: Teo Camarasu <teofilcamarasu@gmail.com>
-
346f2f5a
by Cheng Shao at 2026-01-20T13:59:30-05:00
hadrian: remove RTS options in ghc-in-ghci flavour
This patch removes the RTS options passed to ghc in ghc-in-ghci
flavour, to workaround command line argument handling issue in
hls/hie-boot that results in `-O64M` instead of `+RTS -O64M -RTS`
being passed to ghc. It's not a hadrian bug per se, since ghc's own
ghc-in-ghci multi repl works fine, but we should still make sure HLS
works. Closes #26801.
-
759fd15a
by Andreas Klebinger at 2026-01-21T16:05:28-05:00
Don't build GHC with -Wcompat
Without bumping the boot compiler the warnings it produces are often not
actionable leading to pointless noise.
Fixes #26800
-
3172db94
by Torsten Schmits at 2026-01-21T16:06:11-05:00
Use the correct field of ModOrigin when formatting error message listing hidden reexports
-
485c12b2
by Cheng Shao at 2026-01-21T16:06:54-05:00
Revert "hadrian: handle findExecutable "" gracefully"
This reverts commit 1e5752f64a522c4025365856d92f78073a7b3bba. The
underlying issue has been fixed in
https://github.com/haskell/directory/commit/75828696e7145adc09179111a0d631b9a09963a4
and present since 1.3.9.0, and hadrian directory lower bound is
1.3.9.0, so we can revert our own in house hack now.
-
5efb58dc
by Cheng Shao at 2026-01-21T16:07:36-05:00
rts: fix typo in TICK_ALLOC_RTS
This patch fixes a typo in the `TICK_ALLOC_RTS` macro, the original
`bytes` argument was silently dropped. The Cmm code has its own
version of `TICK_ALLOC_RTS` not affected by this typo, it affected the
C RTS, and went unnoticed because the variable `n` happened to also be
available at its call site. But the number was incorrect. Also fixes
its call site since `WDS()` is not available in C.
-
c406ea69
by Cheng Shao at 2026-01-21T16:07:36-05:00
rts: remove broken & unused ALLOC_P_TICKY
This patch removes the `ALLOC_P_TICKY` macro from the rts, it's
unused, and its expanded code is already broken.
-
34a27e20
by Simon Peyton Jones at 2026-01-21T16:08:17-05:00
Make the implicit-parameter class have representational role
This MR addresses #26737, by making the built-in class IP
have a representational role for its second parameter.
See Note [IP: implicit parameter class] in
ghc-internal:GHC.Internal.Classes.IP
In fact, IP is (unfortunately, currently) exposed by
base:GHC.Base, so we ran a quick CLC proposal to
agree the change:
https://github.com/haskell/core-libraries-committee/issues/385
Some (small) compilations get faster because they only need to
load (small) interface file GHC.Internal.Classes.IP.hi,
rather than (large) GHC.Internal.Classes.hi.
Metric Decrease:
T10421
T12150
T12425
T24582
T5837
T5030
-
ca79475f
by Cheng Shao at 2026-01-21T16:09:00-05:00
testsuite: avoid re.sub in favor of simple string replacements
This patch refactors the testsuite driver and avoids the usage of
re.sub in favor of simple string replacements when possible. The
changes are not comprehensive, and there are still a lot of re.sub
usages lingering around the tree, but this already addresses a major
performance bottleneck in the testsuite driver that might has to do
with quadratic or worse slowdown in cpython's regular expression
engine when handling certain regex patterns with large strings.
Especially on i386, and i386 jobs are the bottlenecks of all full-ci
validate pipelines!
Here are the elapsed times of testing x86_64/i386 with -j48 before
this patch:
x86_64: `Build completed in 6m06s`
i386: `Build completed in 1h36m`
And with this patch:
x86_64: `Build completed in 4m55s`
i386: `Build completed in 4m23s`
Fixes #26786.
Co-authored-by: Codex <codex@openai.com>
-
88c93796
by Zubin Duggal at 2026-01-21T16:09:42-05:00
ghc-toolchain: Also configure windres on non-windows platforms.
It may be needed for cross compilation.
Fixes #24588
-
9788c0ec
by Cheng Shao at 2026-01-21T16:10:24-05:00
ghci: print external interpreter trace messages to stderr instead of stdout
This patch makes ghci print external interpreter trace messages to
stderr instead of stdout, which is a much saner choice for diagnostic
information. Closes #26807.
-
0491f08a
by Sylvain Henry at 2026-01-22T03:44:26-05:00
GC: don't use CAS without PARALLEL_GC on
If we're not using the parallel GC, there is no reason to do a costly
CAS. This was flagged as taking time in a perf profile.
-
211a8f56
by Sylvain Henry at 2026-01-22T03:44:26-05:00
GC: suffix parallel GC with "par" instead of "thr"
Avoid some potential confusion (see discussion in !15351).
-
77a23cbd
by fendor at 2026-01-22T03:45:08-05:00
Remove blanket ignore that covers libraries/
-
18bf7f5c
by Léana Jiang at 2026-01-22T08:58:45-05:00
doc: update Flavour type in hadrian user-settings
-
3d5a1365
by Cheng Shao at 2026-01-22T08:59:28-05:00
hadrian: add missing notCross predicate for stage0 -O0
There are a few hard-coded hadrian args that pass -O0 when compiling
some heavy modules in stage0, which only makes sense when not
cross-compiling and when cross-compiling we need properly optimized
stage0 packages. So this patch adds the missing `notCross` predicate
in those places.
-
ee937134
by Matthew Pickering at 2026-01-22T09:00:10-05:00
Fix ghc-experimental GHC.Exception.Backtrace.Experimental module
This module wasn't added to the cabal file so it was never compiled or
included in the library.
-
1b490f5a
by Zubin Duggal at 2026-01-22T09:00:53-05:00
hadrian: Add ghc-{experimental,internal}.cabal to the list of dependencies of the doc target
We need these files to detect the version of these libraries
Fixes #26738
-
cdb74049
by Cheng Shao at 2026-01-22T14:52:36-05:00
rts: avoid Cmm loop to initialize Array#/SmallArray#
Previously, `newArray#`/`newSmallArray#` called an RTS C function to
allocate the `Array#`/`SmallArray#`, then used a Cmm loop to
initialize the elements. Cmm doesn't have native for-loop so the code
is a bit awkward, and it's less efficient than a C loop, since the C
compiler can effectively vectorize the loop with optimizations.
So this patch moves the loop that initializes the elements to the C
side. `allocateMutArrPtrs`/`allocateSmallMutArrPtrs` now takes a new
`init` argument and initializes the elements if `init` is non-NULL.
-
4c784f00
by Cheng Shao at 2026-01-22T14:53:19-05:00
Fix testsuite run for +ipe flavour transformer
This patch makes the +ipe flavour transformer pass the entire
testsuite:
- An RTS debug option `-DI` is added, the IPE trace information is now
only printed with `-DI`. The test cases that do require IPE trace
are now run with `-DI`.
- The testsuite config option `ghc_with_ipe` is added, enabled when
running the testsuite with `+ipe`, which skips a few tests that are
sensitive to eventlog output, allocation patterns etc that can fail
under `+ipe`.
This is the first step towards #26799.
Co-authored-by: Codex <codex@openai.com>
-
be8e5236
by Ben Gamari at 2026-01-23T03:28:45-05:00
hadrian: Bump QuickCheck upper bound
This patch bumps QuickCheck upper bound to 2.18. selftest rule
manually tested to work with current latest QuickCheck-2.17.1.0.
-
5aa328fb
by Zubin Duggal at 2026-01-23T03:29:30-05:00
Add genindex to index.rst. This adds a link to the index in the navigation bar.
Fixes #26437
-
917ab8ff
by Oleg Grenrus at 2026-01-23T10:52:55-05:00
Export labelThread from Control.Concurrent
-
3f5e8d80
by Cheng Shao at 2026-01-23T10:53:37-05:00
ci: only push perf notes on master/release branches
This patch fixes push_perf_notes logic in ci.sh to only push perf
notes on master/release branches. We used to unconditionally push perf
notes even in MRs, but the perf numbers in the wip branches wouldn't
be used as baseline anyway, plus this is causing a space leak in the
ghc-performance-notes repo. See #25317 for the perf notes repo size
problem.
Co-authored-by: Codex <codex@openai.com>
-
414b9593
by Cheng Shao at 2026-01-24T07:11:51-05:00
ci: remove duplicate keys in .gitlab-ci.yml
This patch removes accidentally duplicate keys in `.gitlab-ci.yml`.
The YAML spec doesn't allow duplicate keys in the first place, and
according to GitLab docs
(https://docs.gitlab.com/ci/yaml/yaml_optimization/#anchors), the
latest key overrides the earlier entries.
-
e5cb5491
by Cheng Shao at 2026-01-24T07:12:34-05:00
hadrian: drop obsolete configure/make builder logic for libffi
This patch drops obsolete hadrian logic around `Configure
libffiPath`/`Make libffiPath` builders, they are no longer needed
after libffi-clib has landed. Closes #26815.
-
2d160222
by Simon Hengel at 2026-01-24T07:13:17-05:00
Fix typo in roles.rst
-
56db94f7
by Peter Trommler at 2026-01-26T11:26:18+01:00
PPC NCG: Generate clear right insn at arch width
The clear right immediate (clrrxi) is only available in word and
doubleword width. Generate clrrxi instructions at architecture
width for all MachOp widths.
Fixes #24145
-
5957a8ad
by Wolfgang Jeltsch at 2026-01-27T06:11:40-05:00
Add operations for obtaining operating-system handles
This contribution implements CLC proposal #369. It adds operations for
obtaining POSIX file descriptors and Windows handles that underlie
Haskell handles. Those operating system handles can also be obtained
without such additional operations, but this is more involved and, more
importantly, requires using internals.
-
86a0510c
by Greg Steuck at 2026-01-27T06:12:34-05:00
Move flags to precede patterns for grep and read files directly
This makes the tests pass with non-GNU (i.e. POSIX-complicant) tools.
There's no reason to use cat and pipe where direct file argument works.
-
50761451
by Cheng Shao at 2026-01-27T21:51:23-05:00
ci: update darwin boot ghc to 9.10.3
This patch updates darwin boot ghc to 9.10.3, along with other related
updates, and pays off some technical debt here:
- Update `nixpkgs` and use the `nixpkgs-25.05-darwin` channel.
- Update the `niv` template.
- Update LLVM to 21 and update `llvm-targets` to reflect LLVM 21
layout changes for arm64/x86_64 darwin targets.
- Use `stdenvNoCC` to prevent nix packaged apple sdk from being used
by boot ghc, and manually set `DEVELOPER_DIR`/`SDKROOT` to enforce
the usage of system-wide command line sdk for macos.
- When building nix derivation for boot ghc, run `configure` via the
`arch` command so that `configure` and its subprocesses pick up the
manually specified architecture.
- Remove the previous horrible hack that obliterates `configure` to
make autoconf test result in true. `configure` now properly does its
job.
- Remove the now obsolete configure args and post install settings
file patching logic.
- Use `scheme-small` for texlive to avoid build failures in certain
unused texlive packages, especially on x86_64-darwin.
-
94dcd15e
by Matthew Pickering at 2026-01-27T21:52:05-05:00
Evaluate backtraces for "error" exceptions at the moment they are thrown
See Note [Capturing the backtrace in throw] and
Note [Hiding precise exception signature in throw] which explain the
implementation.
This commit makes `error` and `throw` behave the same with regard to
backtraces. Previously, exceptions raised by `error` would not contain
useful IPE backtraces.
I did try and implement `error` in terms of `throw` but it started to
involve putting diverging functions into hs-boot files, which seemed to
risky if the compiler wouldn't be able to see if applying a function
would diverge.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/383
Fixes #26751
-
ef35e3ea
by Teo Camarasu at 2026-01-27T21:52:46-05:00
ghc-internal: move all Data instances to Data.Data
Most instances of Data are defined in GHC.Internal.Data.Data.
Let's move all remaining instance there.
This moves other modules down in the dependency hierarchy allowing for
more parallelism, and it decreases the likelihood that we would need to
load this heavy .hi file if we don't actually need it.
Resolves #26830
Metric Decrease:
T12227
T16875
-
5e0ec555
by sheaf at 2026-01-28T06:56:38-05:00
Add test case for #25679
This commit adds the T25679 test case. The test now passes, thanks to
commit 1e53277af36d3f0b6ad5491f70ffc5593a49dcfd.
Fixes #25679
-
f1cd1611
by sheaf at 2026-01-28T06:56:38-05:00
Improve defaulting of representational equalities
This commit makes the defaulting of representational equalities, introduced
in 1e53277a, a little bit more robust. Now, instead of calling the eager
unifier, it calls the full-blown constraint solver, which means that it can
handle some subtle situations, e.g. involving functional dependencies and
type-family injectivity annotations, such as:
type family F a = r | r -> a
type instance F Int = Bool
[W] F beta ~R Bool
-
25edf516
by sheaf at 2026-01-28T06:56:38-05:00
Improve errors for unsolved representational equalities
This commit adds a new field of CtLoc, CtExplanations, which allows the
typechecker to leave some information about what it has done. For the moment,
it is only used to improve error messages for unsolved representational
equalities. The typechecker will now accumulate, when unifying at
representational role:
- out-of-scope newtype constructors,
- type constructors that have nominal role in a certain argument,
- over-saturated type constructors,
- AppTys, e.g. `c a ~R# c b`, to report that we must assume that 'c' has
nominal role in its parameters,
- data family applications that do not reduce, potentially preventing
newtype unwrapping.
Now, instead of having to re-construct the possible errors after the fact,
we simply consult the CtExplanations field.
Additionally, this commit modifies the typechecker error messages that
concern out-of-scope newtype constructors. The error message now depends
on whether we have an import suggestion to provide to the user:
- If we have an import suggestion for the newtype constructor,
the message will be of the form:
The data constructor MkN of the newtype N is out of scope
Suggested fix: add 'MkN' to the import list in the import of 'M'
- If we don't have any import suggestions, the message will be
of the form:
NB: The type 'N' is an opaque newtype, whose constructor is hidden
Fixes #15850, #20289, #20468, #23731, #25949, #26137
-
4d0e6da1
by Simon Peyton Jones at 2026-01-28T06:57:19-05:00
Fix two bugs in short-cut constraint solving
There are two main changes here:
* Use `isSolvedWC` rather than `isEmptyWC` in `tryShortCutSolver`
The residual constraint may have some fully-solved, but
still-there implications, and we don't want them to abort short
cut solving! That bug caused #26805.
* In the short-cut solver, we abandon the fully-solved residual
constraint; but we may thereby lose track of Givens that are
needed, and either report them as redundant or prune evidence
bindings that are in fact needed.
This bug stopped the `constraints` package from compiling;
see the trail in !15389.
The second bug led me to (another) significant refactoring
of the mechanism for tracking needed EvIds. See the new
Note [Tracking needed EvIds] in GHC.Tc.Solver.Solve
It's simpler and much less head-scratchy now.
Some particulars:
* An EvBindsVar now tracks NeededEvIds
* We deal with NeededEvIds for an implication only when it is
fully solved. Much simpler!
* `tryShortCutTcS` now takes a `TcM WantedConstraints` rather than
`TcM Bool`, so that is can plumb the needed EvIds correctly.
* Remove `ic_need` and `ic_need_implic` from Implication (hooray),
and add `ics_dm` and `ics_non_dm` to `IC_Solved`.
Pure refactor
* Shorten data constructor `CoercionHole` to `CH`, following
general practice in GHC.
* Rename `EvBindMap` to `EvBindsMap` for consistency
-
662480b7
by Cheng Shao at 2026-01-28T06:58:00-05:00
ci: use debian validate bindists instead of fedora release bindists in testing stage
This patch changes the `abi-test`, `hadrian-multi` and `perf` jobs in
the full-ci pipeline testing stage to use debian validate bindists
instead of fedora release bindists, to increase pipeline level
parallelism and allow full-ci pipelines to complete earlier. Closes #26818.
-
39581ec6
by Cheng Shao at 2026-01-28T06:58:40-05:00
ci: run perf test with -j$cores
This patch makes the perf ci job compile Cabal with -j$cores to speed
up the job.
-
607b287b
by Wolfgang Jeltsch at 2026-01-28T15:41:53+02:00
Remove `GHC.Desugar` from `base`
`GHC.Desugar` was deprecated and should have been removed in GHC 9.14.
However, the removal was forgotten, although there was a code block that
was intended to trigger a compilation error when the GHC version in use
was 9.14 or later. This code sadly didn’t work, because the
`__GLASGOW_HASKELL__` macro was misspelled as `__GLASGOW_HASKELL`.
-
e8f5a45d
by sterni at 2026-01-29T04:19:18-05:00
users_guide: fix runtime error during build with Sphinx 9.1.0
Appears that pathto is stricter about what it accepts now.
Tested Sphinx 8.2.3 and 9.1.0 on the ghc-9.10 branch.
Resolves #26810.
Co-authored-by: Martin Weinelt <hexa@darmstadt.ccc.de>
-
ce2d62fb
by Jessica Clarke at 2026-01-29T19:48:51-05:00
PPC NCG: Use libcall for 64-bit cmpxchg on 32-bit PowerPC
There is no native instruction for this, and even if there were a
register pair version we could use, the implementation here is assuming
the values fit in a single register, and we end up only using / defining
the low halves of the registers.
Fixes: b4d39adbb5 ("PrimOps: Add CAS op for all int sizes")
Fixes: #23969
-
43d97761
by Michael Karcher at 2026-01-29T19:49:43-05:00
NCG for PPC: add pattern for CmmRegOff to iselExpr64
Closes #26828
-
aeeb4a20
by Matthew Pickering at 2026-01-30T11:42:47-05:00
determinism: Use deterministic map for Strings in TyLitMap
When generating typeable evidence the types we need evidence for all
cached in a TypeMap, the order terms are retrieved from a type map
determines the order the bindings appear in the program.
A TypeMap is quite diligent to use deterministic maps, apart from in the
TyLitMap, which uses a UniqFM for storing strings, whose ordering
depends on the Unique of the FastString.
This can cause non-deterministic .hi and .o files.
An unexpected side-effect is the error message but RecordDotSyntaxFail8
changing. I looked into this with Sam and this change caused the
constraints to be solved in a different order which results in a
slightly different error message. I have accepted the new test, since
the output before was non-deterministic and the new output is consistent
with the other messages in that file.
Fixes #26846
-
9e4d70c2
by Andrew Lelechenko at 2026-01-30T11:43:29-05:00
Upgrade text submodule to 2.1.4
-
631fa5ae
by Recursion Ninja at 2026-01-31T22:30:11+00:00
Decouple `L.S.H.Decls` from importing `GHC.Types.Basic`
Data-types within `GHC.Types.Basic` which describe components of
the AST are migrated to `Language.Haskell.Syntax.Basic`. Related
function definitions are also moved.
Types moved to L.H.S. because they are part of the AST:
* TopLevelFlag
* RuleName
Types moved from L.H.S. to GHC.Hs. because they are not needed in the AST:
* TyConFlavour
* TypeOrData
* NewOrData
Migrated instances:
* `Outputable` instances moved to in `GHC.Utils.Outputable`
* `Binary` instance of `Boxity` moved to to `GHC.Utils.Binary`
* Other `Binary` instances are orphans to be migrated later.
The `OverlapMode` data-type is given a TTG extension point.
The `OverlapFlag` data-type, which depends on `OverlapMode`,
is updated to support `OverlapMode` with a GHC "pass" type paramerter.
In order to avoid module import cycles, `OverlapMode` and `OverlapFlag`
are migrated to new modules (no way around this).
* Migrated `OverlapMode` to new module `Language.Haskell.Syntax.Overlap`
* Migrated `OverlapFlag` to new module `GHC.Hs.Decls.Overlap`
-
9769cc03
by Simon Hengel at 2026-02-01T04:21:03-05:00
Update the documentation for MultiWayIf (fixes #25376)
(so that it matches the implementation)
-
5fc9442a
by Peter Trommler at 2026-02-01T04:21:44-05:00
hadrian: Fix dependency generation for assembler
Assembler files allow # for comments unless in column 1. A modern
cpp for C treats those a preprocessor directives. We tell gcc that
a .S file is assembler with cpp and not C.
Fixes #26819
-
269c4087
by Simon Peyton Jones at 2026-02-01T19:38:10-05:00
Include current phase in the range for rule/unfoldings
This MR fixes a bad loop in the compiler: #26826.
The fix is to add (WAR2) to
Note [What is active in the RHS of a RULE or unfolding?]
in GHC.Core.Opt.Simplify.Utils
-
ddf1434f
by Vladislav Zavialov at 2026-02-01T19:38:52-05:00
Refactor: merge HsMultilineString into HsString (#26860)
Before this patch, HsLit defined two separate constructors to represent
single-line and multi-line strings:
data HsLit x
...
| HsString (XHsString x) FastString
| HsMultilineString (XHsMultilineString x) FastString
I found this to be an unnecessary complication and an obstacle to unifying
HsLit with HsTyLit. Now we use HsString for both kinds of literals.
One user-facing change here is `ppr (HsString st s)` behaving differently for
single-line strings containing newlines:
x = "first line \
\asdf\n\
\second line"
Previously, the literal was fed to `ftext` with its newlines, producing an
ill-formed SDoc. This issue is now addressed by using `split` for both
single-line and multi-line strings:
vcat $ map text $ split '\n' (unpackFS src)
See the parser/should_fail/T26860ppr test.
In addition (and unrelatedly to the main payload of this patch),
drop the unused pmPprHsLit helper.
-
2b4f463c
by Simon Peyton Jones at 2026-02-02T17:32:32+00:00
Remove exprIsCheap from doFloatFromRhs
See #26854 and Note [Float when expandable]
This patch simplifies the code, by removing an extra unnecessary test.
-
9db7f21f
by Brandon Chinn at 2026-02-03T09:15:10-05:00
Refactor: make function patterns exhaustive
Also added missing (==) logic for:
* HsMultilineString
* HsInt{8,16,32}
* HsWord{8,16,32}
-
aa9c5e2c
by Hécate Kleidukos at 2026-02-03T15:58:35-05:00
driver: Hide source paths at verbosity level 1 by default
-
c64cca1e
by mangoiv at 2026-02-03T15:59:29-05:00
ExplicitLevelImports: check staging for types just like for values
Previously, imported types were entirely exempted from staging checks as
the implicit stage persistance assumed to be all imported types to be
well staged. ExplicitLevelImports' change specification, however, does
not do such an exemption. Thus we want to introduce such a check, just
like we have for values.
ExplicitLevelImports does not, however, talk about local names - from
its perspective, we could theoretically keep treating locally introduced
types specially - e.g. an ill-staged used in a quote would only emit a
warning, not an error. To allow for a potential future migration away
from such wrinkles as the staging check in notFound
(see Note [Out of scope might be a staging error]) we consistently do
the strict staging check that we also do for value if ExplicitLevelImports
is on.
Closes #26098
-
5f0dbeb6
by Simon Hengel at 2026-02-03T16:00:12-05:00
Use Haddock formatting in deprecation message of `initNameCache`
-
01ecb612
by Andreas Klebinger at 2026-02-04T09:56:25-05:00
testsuite: Explicitly use utf-8 encoding in rts-includes linter.
Not doing so caused failures on windows, as python failed to pick a
reasonable encoding even with locale set.
Fixes #26850
-
ea0d1317
by Zubin Duggal at 2026-02-04T09:57:06-05:00
Bump transformers submodule to 0.6.3.0
Fixes #26790
-
cbe4300e
by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Fix subtle bug in GHC.Core.Utils.mkTick
This patch fixes a decade-old bug in `mkTick`, which
could generate type-incorrect code! See the diagnosis
in #26772.
The new code is simpler and easier to understand.
(As #26772 says, I think it could be improved further.)
-
a193a8da
by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Modify a debug-trace in the Simplifier
...just to show a bit more information.
-
b579dfdc
by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Fix long-standing interaction between ticks and casts
The code for Note [Eliminate Identity Cases] was simply wrong when
ticks and casts interacted. This patch fixes the interaction.
It was shown up when validating #26772, although it's not the exactly
the bug that's reported by #26772. Nor is it easy to reproduce, hence
no regression test.
-
fac0de1e
by Cheng Shao at 2026-02-05T04:31:49-05:00
libraries: bump Cabal submodule to 3.16.1.0
-
00589122
by Cheng Shao at 2026-02-05T04:31:49-05:00
libraries: bump deepseq submodule to 1.5.2.0
Also:
- Get rid of usage of deprecated `NFData` function instance in the
compiler
- `T21391` still relies on `NFData` function instance, add
`-Wno-deprecations` for the time being.
-
84474c71
by Cheng Shao at 2026-02-05T04:31:50-05:00
libraries: bump directory submodule to 1.3.10.1
-
1a9f4662
by Cheng Shao at 2026-02-05T04:31:50-05:00
libraries: bump exceptions submodule to 0.10.12
-
2e39a340
by Peng Fan at 2026-02-07T03:42:01-05:00
NCG/LA64: adjust register usage to avoid src-register being clobbered
-
9faf1b35
by Teo Camarasu at 2026-02-07T03:42:43-05:00
ghc-internal: Delete unnecessary GHC.Internal.Data.Ix
This module merely re-exports GHC.Internal.Ix. It was copied from
`base` when `ghc-internal` was split, but there is no reason to have
this now. So, let's delete it.
Resolves #26848
-
d112b440
by Sven Tennie at 2026-02-07T10:47:56-05:00
Add cabal.project file to generate-ci
This fixes the HLS setup for our CI code generation script
(generate-ci).
The project file simply makes `generate-ci` of the cabal file
discoverable.
-
5339f6f0
by Andreas Klebinger at 2026-02-07T10:48:40-05:00
CI: Don't collapse test results.
This puts test output back into the primary test log instead of a
subsection removing the need to expand a section to see test results.
While the intention was good in practice the old behaviour mostly wastes time
by requiring expansion of the section.
Fixes #26882
-
0e1cd2e0
by Evan Piro at 2026-02-08T10:35:16-08:00
Linker.MacOS reduce dynflags import
-
1c79a4cd
by Michael Alan Dorman at 2026-02-09T08:11:51-05:00
Remove `extra_src_files` variable from `testsuite/driver/testlib.py`
While reading through the test harness code, I noticed this variable
with a TODO attached that referenced #12223. Although that bug is
closed, it strongly implied that this special-case variable that only
affected a single test was expected to be removed at some point.
I also looked at 3415bcaa0b1903b5e12dfaadb5b774718e406eab---where it
was added---whose commit message suggested that it would have been
desirable to remove it, but that there were special circumstances that
meant it had to remain (though it doesn't elucidate what those special
circumstances are).
However, the special circumstances were mentioned as if the test was
in a different location than is currently is, so I decided to try
changing the test to use the standard `extra_files` mechanism, which
works in local testing.
This also seems like a reasonable time to remove the script that was
originally used in the transition, since it doesn't really serve a
purpose anymore.
-
0020e38a
by Matthew Pickering at 2026-02-09T17:29:14-05:00
determinism: Use a stable sort in WithHsDocIdentifiers binary instance
`WithHsDocIdentifiers` is defined as
```
71 data WithHsDocIdentifiers a pass = WithHsDocIdentifiers
72 { hsDocString :: !a
73 , hsDocIdentifiers :: ![Located (IdP pass)]
74 }
```
This list of names is populated from `rnHsDocIdentifiers`, which calls
`lookupGRE`, which calls `lookupOccEnv_AllNameSpaces`, which calls
`nonDetEltsUFM` and returns the results in an order depending on
uniques.
Sorting the list with a stable sort before returning the interface makes
the output deterministic and follows the approach taken by other fields
in `Docs`.
Fixes #26858
-
89898ce6
by echoumcp1 at 2026-02-09T17:30:01-05:00
Replace putstrln with logMsg in handleSeqHValueStatus
Fixes #26549
-
7c52c4f9
by John Paul Adrian Glaubitz at 2026-02-10T13:52:43-05:00
rts: Switch prim to use modern atomic compiler builtins
The __sync_*() atomic compiler builtins have been deprecated in GCC
for a while now and also don't provide variants for 64-bit values
such as __sync_fetch_and_add_8().
Thus, replace them with the modern __atomic_*() compiler builtins and
while we're at it, also drop the helper macro CAS_NAND() which is now
no longer needed since we stopped using the __sync_*() compiler builtins
altogether.
Co-authored-by: Ilias Tsitsimpis <iliastsi@debian.org>
Fixes #26729
-
cf60850a
by Recursion Ninja at 2026-02-10T13:53:27-05:00
Decoupling L.H.S.Decls from GHC.Types.ForeignCall
- Adding TTG extension point for 'CCallTarget'
- Adding TTG extension point for 'CType'
- Adding TTG extension point for 'Header'
- Moving ForeignCall types that do not need extension
to new L.H.S.Decls.Foreign module
- Replacing 'Bool' parameters with descriptive data-types
to increase clairty and prevent "Boolean Blindness"
-
11a04cbb
by Eric Lee at 2026-02-11T09:20:46-05:00
Derive Semigroup/Monoid for instances believed could be derived in #25871
-
15d9ce44
by Eric Lee at 2026-02-11T09:20:46-05:00
add Ghc.Data.Pair deriving
-
c85dc170
by Evan Piro at 2026-02-11T09:21:45-05:00
Linker.MacOS reduce options import
-
a541dd83
by Chris Wendt at 2026-02-11T16:06:41-05:00
Initialize plugins for `:set +c` in GHCi
Fixes #23110.
-
0f5a73bc
by Cheng Shao at 2026-02-11T16:07:27-05:00
compiler: add Binary Text instance
This patch adds `Binary` instance for strict `Text`, in preparation of
making `Text` usable in certain GHC API use cases (e.g. haddock). This
also introduces `text` as a direct dependency of the `ghc` package.
-
9e58b8a1
by Cheng Shao at 2026-02-11T16:08:10-05:00
ghc-toolchain: add C11 check
This patch partially reverts commit
b8307eab80c5809df5405d76c822bf86877f5960 that removed C99 check in
autoconf/ghc-toolchain. Now we:
- No longer re-implement `FP_SET_CFLAGS_C11` similar to
`FP_SET_CFLAGS_C99` in the past, since autoconf doesn't provide a
convenient `AC_PROG_CC_C11` function. ghc-toolchain will handle it
anyway.
- The Cmm CPP C99 check is relanded and repurposed for C11.
- The C99 logic in ghc-toolchain is relanded and repurposed for C11.
- The C99 check in Stg.h is corrected to check for C11. The obsolete
_ISOC99_SOURCE trick is dropped.
- Usages of `-std=gnu99` in the testsuite are corrected to use
`-std=gnu11`.
Closes #26908.
-
4df0adf6
by Simon Peyton Jones at 2026-02-11T21:50:13-05:00
Simplify the treatment of static forms
This MR implements GHC proposal 732: simplify static forms,
https://github.com/ghc-proposals/ghc-proposals/pull/732
thereby addressing #26556.
See `Note [Grand plan for static forms]` in GHC.Iface.Tidy.StaticPtrTable
The main changes are:
* There is a new, simple rule for (static e), namely that the free
term variables of `e` must be bound at top level. The check is
done in the `HsStatic` case of `GHC.Rename.Expr.rnExpr`
* That in turn substantially simplifies the info that the typechecker
carries around in its type environment. Hooray.
* The desugarer emits static bindings to top level directly; see the
`HsStatic` case of `dsExpr`.
* There is no longer any special static-related magic in the FloatOut
pass. And the main Simplifier pipeline no longer needs a special case
to run FloatOut even with -O0. Hooray.
All this forced an unexpected change to the pattern match checker. It
recursively invokes the main Hs desugarer when it wants to take a look
at a term to spot some special cases (notably constructor applications).
We don't want to emit any nested (static e) bindings to top level a
second time! Yikes.
That forced a modest refactor in GHC.HsToCore.Pmc:
* The `dsl_nablas` field of `DsLclEnv` now has a `NoPmc` case, which says
"I'm desugaring just for pattern-match checking purposes".
* When that flag is set we don't emit static binds.
That in turn forces a cascade of refactoring, but the net effect is an
improvement; less risk of duplicated (even exponential?) work.
See Note [Desugaring HsExpr during pattern-match checking].
10% metric decrease, on some architectures, of compile-time max-bytes-used on T15304.
Metric Decrease:
T15304
-
7922f728
by Teo Camarasu at 2026-02-11T21:50:58-05:00
ghc-internal: avoid depending on GHC.Internal.Exts
This module is mostly just re-exports. It made sense as a user-facing
module, but there's no good reason ghc-internal modules should depend on
it and doing so linearises the module graph
- move considerAccessible to GHC.Internal.Magic
Previously it lived in GHC.Internal.Exts, but it really deserves to live
along with the other magic function, which are already re-exported from .Exts
- move maxTupleSize to GHC.Internal.Tuple
This previously lived in GHC.Internal.Exts but a comment already said it
should be moved to .Tuple
Resolves #26832
-
b6a4a29b
by Eric Lee at 2026-02-11T21:51:55-05:00
Remove unused Semigroup imports to fix GHC 9.14 bootstrapping
-
99d8c146
by Simon Peyton Jones at 2026-02-12T17:36:59+00:00
Fix subtle bug in cast worker/wrapper
See (CWw4) in Note [Cast worker/wrapper].
The true payload is in the change to the definition of
GHC.Types.Id.Info.hasInlineUnfolding
Everthing else is just documentation.
There is a 2% compile time decrease for T13056;
I'll take the win!
Metric Decrease:
T13056
-
530e8e58
by Simon Peyton Jones at 2026-02-12T20:17:23-05:00
Add regression tests for four StaticPtr bugs
Tickets #26545, #24464, #24773, #16981 are all solved by the
recently-landed MR
commit 318ee13bcffa6aa8df42ba442ccd92aa0f7e210c
Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
Date: Mon Oct 20 23:07:20 2025 +0100
Simplify the treatment of static forms
This MR just adds regression tests for them.
-
78f79929
by fendor at 2026-02-13T13:02:11+01:00
Hide implementation details for exception throwing
Ensure we hide the implementation details of the exception throwing mechanisms:
* `undefined`
* `throwSTM`
* `throw`
* `throwIO`
* `error`
The `HasCallStackBacktrace` should always have a length of exactly 1,
not showing internal implementation details in the stack trace, as these
are vastly distracting to end users.
CLC proposal [#387](https://github.com/haskell/core-libraries-committee/issues/387)
Adds regression tests for backtraces.