[Git][ghc/ghc][wip/T23070-unify] 69 commits: Add release note for GHC.Unicode refactor in base-4.18.
Simon Peyton Jones (@simonpj)
gitlab at gitlab.haskell.org
Mon Apr 24 23:14:21 UTC 2023
Simon Peyton Jones pushed to branch wip/T23070-unify at Glasgow Haskell Compiler / GHC
Commits:
0c990e13 by Pierre Le Marre at 2023-04-06T10:16:29+00:00
Add release note for GHC.Unicode refactor in base-4.18.
Also merge CLC proposal 130 in base-4.19 with CLC proposal 59 in
base-4.18 and add proper release date.
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cbbfb283 by Alex Dixon at 2023-04-07T18:27:45-04:00
Improve documentation for ($) (#22963)
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5193c2b0 by Alex Dixon at 2023-04-07T18:27:45-04:00
Remove trailing whitespace from ($) commentary
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b384523b by Sebastian Graf at 2023-04-07T18:27:45-04:00
Adjust wording wrt representation polymorphism of ($)
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6a788f0a by Torsten Schmits at 2023-04-07T22:29:28-04:00
Add structured error messages for GHC.Tc.TyCl.Utils
Tracking ticket: #20117
MR: !10251
This converts uses of `mkTcRnUnknownMessage` to newly added constructors
of `TcRnMessage`.
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3ba77b36 by sheaf at 2023-04-07T22:30:07-04:00
Renamer: don't call addUsedGRE on an exact Name
When looking up a record field in GHC.Rename.Env.lookupRecFieldOcc,
we could end up calling addUsedGRE on an exact Name, which would then
lead to a panic in the bestImport function: it would be incapable of
processing a GRE which is not local but also not brought into scope
by any imports (as it is referred to by its unique instead).
Fixes #23240
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bc4795d2 by Krzysztof Gogolewski at 2023-04-11T19:24:54-04:00
Add support for -debug in the testsuite
Confusingly, GhcDebugged referred to GhcDebugAssertions.
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b7474b57 by Krzysztof Gogolewski at 2023-04-11T19:24:54-04:00
Add missing cases in -Di prettyprinter
Fixes #23142
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6c392616 by Cheng Shao at 2023-04-11T19:25:31-04:00
compiler: make WasmCodeGenM an instance of MonadUnique
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05d26a65 by Cheng Shao at 2023-04-11T19:25:31-04:00
compiler: apply cmm node-splitting for wasm backend
This patch applies cmm node-splitting for wasm32 NCG, which is
required when handling irreducible CFGs. Fixes #23237.
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f1892cc0 by Bodigrim at 2023-04-11T19:26:09-04:00
Set base 'maintainer' field to CLC
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ecf22da3 by Simon Peyton Jones at 2023-04-11T19:26:45-04:00
Clarify a couple of Notes about 'nospec'
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ebd8918b by Oleg Grenrus at 2023-04-12T12:32:57-04:00
Allow generation of TTH syntax with TH
In other words allow generation of typed splices and brackets with
Untyped Template Haskell.
That is useful in cases where a library is build with TTH in mind,
but we still want to generate some auxiliary declarations,
where TTH cannot help us, but untyped TH can.
Such example is e.g. `staged-sop` which works with TTH,
but we would like to derive `Generic` declarations with TH.
An alternative approach is to use `unsafeCodeCoerce`, but then the
derived `Generic` instances would be type-checked only at use sites,
i.e. much later. Also `-ddump-splices` output is quite ugly:
user-written instances would use TTH brackets, not `unsafeCodeCoerce`.
This commit doesn't allow generating of untyped template splices
and brackets with untyped TH, as I don't know why one would want to do
that (instead of merging the splices, e.g.)
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690d0225 by Rodrigo Mesquita at 2023-04-12T12:33:33-04:00
Add regression test for #23229
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59321879 by Sylvain Henry at 2023-04-13T08:50:33-04:00
Add quotRem rules (#22152)
case quotRemInt# x y of
(# q, _ #) -> body
====>
case quotInt# x y of
q -> body
case quotRemInt# x y of
(# _, r #) -> body
====>
case remInt# x y of
r -> body
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4dd02122 by Sylvain Henry at 2023-04-13T08:50:33-04:00
Add quot folding rule (#22152)
(x / l1) / l2
l1 and l2 /= 0
l1*l2 doesn't overflow
==> x / (l1 * l2)
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1148ac72 by Sylvain Henry at 2023-04-13T08:50:33-04:00
Make Int64/Word64 division ok for speculation too.
Only when the divisor is definitely non-zero.
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8af401cc by Sylvain Henry at 2023-04-13T08:50:33-04:00
Make WordQuotRem2Op ok-for-speculation too
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27d2978e by Josh Meredith at 2023-04-13T08:51:09-04:00
Base/JS: GHC.JS.Foreign.Callback module (issue 23126)
* Add the Callback module for "exporting" Haskell functions
to be available to plain JavaScript code
* Fix some primitives defined in GHC.JS.Prim
* Add a JavaScript section to the user guide with instructions
on how to use the JavaScript FFI, building up to using Callbacks
to interact with the browser
* Add tests for the JavaScript FFI and Callbacks
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a34aa8da by Adam Sandberg Ericsson at 2023-04-14T04:17:52-04:00
rts: improve memory ordering and add some comments in the StablePtr implementation
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d7a768a4 by Matthew Pickering at 2023-04-14T04:18:28-04:00
docs: Generate docs/index.html with version number
* Generate docs/index.html to include the version of the ghc library
* This also fixes the packageVersions interpolations which were
- Missing an interpolation for `LIBRARY_ghc_VERSION`
- Double quoting the version so that "9.7" was being inserted.
Fixes #23121
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d48fbfea by Simon Peyton Jones at 2023-04-14T04:19:05-04:00
Stop if type constructors have kind errors
Otherwise we get knock-on errors, such as #23252.
This makes GHC fail a bit sooner, and I have not attempted to add
recovery code, to add a fake TyCon place of the erroneous one,
in an attempt to get more type errors in one pass. We could
do that (perhaps) if there was a call for it.
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2371d6b2 by Simon Peyton Jones at 2023-04-14T20:01:02+02:00
Major refactor in the handling of equality constraints
This MR substantially refactors the way in which the constraint
solver deals with equality constraints. The big thing is:
* Intead of a pipeline in which we /first/ canonicalise and /then/
interact (the latter including performing unification) the two steps
are more closely integreated into one. That avoids the current
rather indirect communication between the two steps.
The proximate cause for this refactoring is fixing #22194, which involve
solving [W] alpha[2] ~ Maybe (F beta[4])
by doing this:
alpha[2] := Maybe delta[2]
[W] delta[2] ~ F beta[4]
That is, we don't promote beta[4]! This is very like introducing a cycle
breaker, and was very awkward to do before, but now it is all nice.
See GHC.Tc.Utils.Unify Note [Promotion and level-checking] and
Note [Family applications in canonical constraints].
The big change is this:
* Several canonicalisation checks (occurs-check, cycle-breaking,
checking for concreteness) are combined into one new function:
GHC.Tc.Utils.Unify.checkTyEqRhs
This function is controlled by `TyEqFlags`, which says what to do
for foralls, type families etc.
* `canEqCanLHSFinish` now sees if unification is possible, and if so,
actually does it: see `canEqCanLHSFinish_try_unification`.
There are loads of smaller changes:
* The on-the-fly unifier `GHC.Tc.Utils.Unify.unifyType` has a
cheap-and-cheerful version of `checkTyEqRhs`, called
`simpleUnifyCheck`. If `simpleUnifyCheck` succeeds, it can unify,
otherwise it defers by emitting a constraint. This is simpler than
before.
* I simplified the swapping code in `GHC.Tc.Solver.Equality.canEqCanLHS`.
Especially the nasty stuff involving `swap_for_occurs` and
`canEqTyVarFunEq`. Much nicer now. See
Note [Orienting TyVarLHS/TyFamLHS]
Note [Orienting TyFamLHS/TyFamLHS]
* Added `cteSkolemOccurs`, `cteConcrete`, and `cteCoercionHole` to the
problems that can be discovered by `checkTyEqRhs`.
* I fixed #23199 `pickQuantifiablePreds`, which actually allows GHC to
to accept both cases in #22194 rather than rejecting both.
Yet smaller:
* Added a `synIsConcrete` flag to `SynonymTyCon` (alongside `synIsFamFree`)
to reduce the need for synonym expansion when checking concreteness.
Use it in `isConcreteType`.
* Renamed `isConcrete` to `isConcreteType`
* Defined `GHC.Core.TyCo.FVs.isInjectiveInType` as a more efficient
way to find if a particular type variable is used injectively than
finding all the injective variables. It is called in
`GHC.Tc.Utils.Unify.definitely_poly`, which in turn is used quite a
lot.
* Moved `rewriterView` to `GHC.Core.Type`, so we can use it from the
constraint solver.
Fixes #22194, #23199
Compile times decrease by an average of 0.1%; but there is a 7.4%
drop in compiler allocation on T15703.
Metric Decrease:
T15703
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99b2734b by Simon Peyton Jones at 2023-04-14T20:01:02+02:00
Add some documentation about redundant constraints
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3f2d0eb8 by Simon Peyton Jones at 2023-04-14T20:01:02+02:00
Improve partial signatures
This MR fixes #23223. The changes are in two places:
* GHC.Tc.Bind.checkMonomorphismRestriction
See the new `Note [When the MR applies]`
We now no longer stupidly attempt to apply the MR when the user
specifies a context, e.g. f :: Eq a => _ -> _
* GHC.Tc.Solver.decideQuantification
See rewritten `Note [Constraints in partial type signatures]`
Fixing this bug apparently breaks three tests:
* partial-sigs/should_compile/T11192
* partial-sigs/should_fail/Defaulting1MROff
* partial-sigs/should_fail/T11122
However they are all symptoms of #23232, so I'm marking them as
expect_broken(23232).
I feel happy about this MR. Nice.
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23e2a8a0 by Simon Peyton Jones at 2023-04-14T20:01:02+02:00
Make approximateWC a bit cleverer
This MR fixes #23224: making approximateWC more clever
See the long `Note [ApproximateWC]` in GHC.Tc.Solver
All this is delicate and ad-hoc -- but it /has/ to be: we are
talking about inferring a type for a binding in the presence of
GADTs, type families and whatnot: known difficult territory.
We just try as hard as we can.
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2c040246 by Matthew Pickering at 2023-04-15T00:57:14-04:00
docs: Update template-haskell docs to use Code Q a rather than Q (TExp a)
Since GHC Proposal #195, the type of [|| ... ||] has been Code Q a
rather than Q (TExp a). The documentation in the `template-haskell`
library wasn't updated to reflect this change.
Fixes #23148
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0da18eb7 by Krzysztof Gogolewski at 2023-04-15T14:35:53+02:00
Show an error when we cannot default a concrete tyvar
Fixes #23153
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bad2f8b8 by sheaf at 2023-04-15T15:14:36+02:00
Handle ConcreteTvs in inferResultToType
inferResultToType was discarding the ir_frr information, which meant
some metavariables ended up being MetaTvs instead of ConcreteTvs.
This function now creates new ConcreteTvs as necessary, instead of
always creating MetaTvs.
Fixes #23154
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3b0ea480 by Simon Peyton Jones at 2023-04-16T18:12:20-04:00
Transfer DFunId_ness onto specialised bindings
Whether a binding is a DFunId or not has consequences for the `-fdicts-strict`
flag, essentially if we are doing demand analysis for a DFunId then `-fdicts-strict` does
not apply because the constraint solver can create recursive groups of dictionaries.
In #22549 this was fixed for the "normal" case, see
Note [Do not strictify the argument dictionaries of a dfun].
However the loop still existed if the DFunId was being specialised.
The problem was that the specialiser would specialise a DFunId and
turn it into a VanillaId and so the demand analyser didn't know to
apply special treatment to the binding anymore and the whole recursive
group was optimised to bottom.
The solution is to transfer over the DFunId-ness of the binding in the specialiser so
that the demand analyser knows not to apply the `-fstrict-dicts`.
Fixes #22549
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a1371ebb by Oleg Grenrus at 2023-04-16T18:12:59-04:00
Add import lists to few GHC.Driver.Session imports
Related to https://gitlab.haskell.org/ghc/ghc/-/issues/23261.
There are a lot of GHC.Driver.Session which only use DynFlags,
but not the parsing code.
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51479ceb by Matthew Pickering at 2023-04-17T08:08:48-04:00
Account for special GHC.Prim import in warnUnusedPackages
The GHC.Prim import is treated quite specially primarily because there
isn't an interface file for GHC.Prim. Therefore we record separately in
the ModSummary if it's imported or not so we don't go looking for it.
This logic hasn't made it's way to `-Wunused-packages` so if you
imported GHC.Prim then the warning would complain you didn't use
`-package ghc-prim`.
Fixes #23212
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1532a8b2 by Simon Peyton Jones at 2023-04-17T08:09:24-04:00
Add regression test for #23199
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0158c5f1 by Ryan Scott at 2023-04-17T18:43:27-04:00
validDerivPred: Reject exotic constraints in IrredPreds
This brings the `IrredPred` case in sync with the treatment of `ClassPred`s as
described in `Note [Valid 'deriving' predicate]` in `GHC.Tc.Validity`. Namely,
we should reject `IrredPred`s that are inferred from `deriving` clauses whose
arguments contain other type constructors, as described in `(VD2) Reject exotic
constraints` of that Note. This has the nice property that `deriving` clauses
whose inferred instance context mention `TypeError` will now emit the type
error in the resulting error message, which better matches existing intuitions
about how `TypeError` should work.
While I was in town, I noticed that much of `Note [Valid 'deriving' predicate]`
was duplicated in a separate `Note [Exotic derived instance contexts]` in
`GHC.Tc.Deriv.Infer`. I decided to fold the latter Note into the former so that
there is a single authority on describing the conditions under which an
inferred `deriving` constraint can be considered valid.
This changes the behavior of `deriving` in a way that existing code might
break, so I have made a mention of this in the GHC User's Guide. It seems very,
very unlikely that much code is relying on this strange behavior, however, and
even if there is, there is a clear, backwards-compatible migration path using
`StandaloneDeriving`.
Fixes #22696.
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10364818 by Krzysztof Gogolewski at 2023-04-17T18:44:03-04:00
Misc cleanup
- Use dedicated list functions
- Make cloneBndrs and cloneRecIdBndrs monadic
- Fix invalid haddock comments in libraries/base
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5e1d33d7 by Matthew Pickering at 2023-04-18T10:31:02-04:00
Convert interface file loading errors into proper diagnostics
This patch converts all the errors to do with loading interface files
into proper structured diagnostics.
* DriverMessage: Sometimes in the driver we attempt to load an interface
file so we embed the IfaceMessage into the DriverMessage.
* TcRnMessage: Most the time we are loading interface files during
typechecking, so we embed the IfaceMessage
This patch also removes the TcRnInterfaceLookupError constructor which
is superceded by the IfaceMessage, which is now structured compared to
just storing an SDoc before.
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df1a5811 by sheaf at 2023-04-18T10:31:43-04:00
Don't panic in ltPatersonSize
The function GHC.Tc.Utils.TcType.ltPatersonSize would panic when it
encountered a type family on the RHS, as usually these are not allowed
(type families are not allowed on the RHS of class instances or of
quantified constraints). However, it is possible to still encounter
type families on the RHS after doing a bit of constraint solving, as
seen in test case T23171. This could trigger the panic in the call to
ltPatersonSize in GHC.Tc.Solver.Canonical.mk_strict_superclasses, which
is involved in avoiding loopy superclass constraints.
This patch simply changes ltPatersonSize to return "I don't know, because
there's a type family involved" in these cases.
Fixes #23171
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d442ac05 by Sylvain Henry at 2023-04-19T20:04:35-04:00
JS: fix thread-related primops
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7a96f90b by Bryan Richter at 2023-04-19T20:05:11-04:00
CI: Disable abi-test-nightly
See #23269
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ab6c1d29 by Sylvain Henry at 2023-04-19T20:05:50-04:00
Testsuite: don't use obsolescent egrep (#22351)
Recent egrep displays the following message, breaking golden tests:
egrep: warning: egrep is obsolescent; using grep -E
Switch to using "grep -E" instead
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f15b0ce5 by Matthew Pickering at 2023-04-20T11:01:06-04:00
hadrian: Pass haddock file arguments in a response file
In !10119 CI was failing on windows because the command line was too
long. We can mitigate this by passing the file arguments to haddock in a
response file.
We can't easily pass all the arguments in a response file because the
`+RTS` arguments can't be placed in the response file.
Fixes #23273
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7012ec2f by tocic at 2023-04-20T11:01:42-04:00
Fix doc typo in GHC.Read.readList
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5c873124 by sheaf at 2023-04-20T18:33:34-04:00
Implement -jsem: parallelism controlled by semaphores
See https://github.com/ghc-proposals/ghc-proposals/pull/540/ for a
complete description for the motivation for this feature.
The `-jsem` option allows a build tool to pass a semaphore to GHC which
GHC can use in order to control how much parallelism it requests.
GHC itself acts as a client in the GHC jobserver protocol.
```
GHC Jobserver Protocol
~~~~~~~~~~~~~~~~~~~~~~
This proposal introduces the GHC Jobserver Protocol. This protocol allows
a server to dynamically invoke many instances of a client process,
while restricting all of those instances to use no more than <n> capabilities.
This is achieved by coordination over a system semaphore (either a POSIX
semaphore [6]_ in the case of Linux and Darwin, or a Win32 semaphore [7]_
in the case of Windows platforms).
There are two kinds of participants in the GHC Jobserver protocol:
- The *jobserver* creates a system semaphore with a certain number of
available tokens.
Each time the jobserver wants to spawn a new jobclient subprocess, it **must**
first acquire a single token from the semaphore, before spawning
the subprocess. This token **must** be released once the subprocess terminates.
Once work is finished, the jobserver **must** destroy the semaphore it created.
- A *jobclient* is a subprocess spawned by the jobserver or another jobclient.
Each jobclient starts with one available token (its *implicit token*,
which was acquired by the parent which spawned it), and can request more
tokens through the Jobserver Protocol by waiting on the semaphore.
Each time a jobclient wants to spawn a new jobclient subprocess, it **must**
pass on a single token to the child jobclient. This token can either be the
jobclient's implicit token, or another token which the jobclient acquired
from the semaphore.
Each jobclient **must** release exactly as many tokens as it has acquired from
the semaphore (this does not include the implicit tokens).
```
Build tools such as cabal act as jobservers in the protocol and are
responsibile for correctly creating, cleaning up and managing the
semaphore.
Adds a new submodule (semaphore-compat) for managing and interacting
with semaphores in a cross-platform way.
Fixes #19349
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52d3e9b4 by Ben Gamari at 2023-04-20T18:34:11-04:00
rts: Initialize Array# header in listThreads#
Previously the implementation of listThreads# failed to initialize the
header of the created array, leading to various nastiness.
Fixes #23071
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1db30fe1 by Ben Gamari at 2023-04-20T18:34:11-04:00
testsuite: Add test for #23071
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dae514f9 by tocic at 2023-04-21T13:31:21-04:00
Fix doc typos in libraries/base/GHC
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113e21d7 by Sylvain Henry at 2023-04-21T13:32:01-04:00
Testsuite: replace some js_broken/js_skip predicates with req_c
Using req_c is more precise.
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038bb031 by Krzysztof Gogolewski at 2023-04-21T18:03:04-04:00
Minor doc fixes
- Add docs/index.html to .gitignore.
It is created by ./hadrian/build docs, and it was the only file
in Hadrian's templateRules not present in .gitignore.
- Mention that MultiWayIf supports non-boolean guards
- Remove documentation of optdll - removed in 2007, 763daed95
- Fix markdown syntax
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e826cdb2 by amesgen at 2023-04-21T18:03:44-04:00
User's guide: DeepSubsumption is implied by Haskell{98,2010}
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499a1c20 by PHO at 2023-04-23T13:39:32-04:00
Implement executablePath for Solaris and make getBaseDir less platform-dependent
Use base-4.17 executablePath when possible, and fall back on
getExecutablePath when it's not available. The sole reason why getBaseDir
had #ifdef's was apparently that getExecutablePath wasn't reliable, and we
could reduce the number of CPP conditionals by making use of
executablePath instead.
Also export executablePath on js_HOST_ARCH.
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97a6f7bc by tocic at 2023-04-23T13:40:08-04:00
Fix doc typos in libraries/base
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787c6e8c by Ben Gamari at 2023-04-24T12:19:06-04:00
testsuite/T20137: Avoid impl.-defined behavior
Previously we would cast pointers to uint64_t. However, implementations
are allowed to either zero- or sign-extend such casts. Instead cast to
uintptr_t to avoid this.
Fixes #23247.
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87095f6a by Cheng Shao at 2023-04-24T12:19:44-04:00
rts: always build 64-bit atomic ops
This patch does a few things:
- Always build 64-bit atomic ops in rts/ghc-prim, even on 32-bit
platforms
- Remove legacy "64bit" cabal flag of rts package
- Fix hs_xchg64 function prototype for 32-bit platforms
- Fix AtomicFetch test for wasm32
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2685a12d by Cheng Shao at 2023-04-24T12:20:21-04:00
compiler: don't install signal handlers when the host platform doesn't have signals
Previously, large parts of GHC API will transitively invoke
withSignalHandlers, which doesn't work on host platforms without
signal functionality at all (e.g. wasm32-wasi). By making
withSignalHandlers a no-op on those platforms, we can make more parts
of GHC API work out of the box when signals aren't supported.
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1338b7a3 by Cheng Shao at 2023-04-24T16:21:30-04:00
hadrian: fix non-ghc program paths passed to testsuite driver when testing cross GHC
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1a10f556 by Bodigrim at 2023-04-24T16:22:09-04:00
Add since pragma to Data.Functor.unzip
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6784698d by Simon Peyton Jones at 2023-04-25T00:16:00+01:00
First steps killing unifyWanted
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b03f8696 by Simon Peyton Jones at 2023-04-25T00:16:00+01:00
Fix a boo boo
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9e98020b by Simon Peyton Jones at 2023-04-25T00:16:00+01:00
Fix another error: missing kick-out
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ecf896cb by Simon Peyton Jones at 2023-04-25T00:16:00+01:00
Maybe working now
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4491938a by Simon Peyton Jones at 2023-04-25T00:16:00+01:00
Wibbles
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60e6bc3a by Simon Peyton Jones at 2023-04-25T00:16:00+01:00
Stop loop
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b73b35d4 by Simon Peyton Jones at 2023-04-25T00:16:00+01:00
Wibbles
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ac83f42c by Simon Peyton Jones at 2023-04-25T00:16:00+01:00
More wibbles
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fce3061e by Simon Peyton Jones at 2023-04-25T00:16:00+01:00
undo accidental change to GHC.Bits
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3964c885 by Simon Peyton Jones at 2023-04-25T00:16:00+01:00
Wibble error messages
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1390c05f by Simon Peyton Jones at 2023-04-25T00:16:00+01:00
Experimental change: coercion holes
Experiment with making a constraint non-canonical if it has
a coercion hole on the RHS.
Simplifies T22707 a lot!
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d9912743 by Simon Peyton Jones at 2023-04-25T00:16:00+01:00
More wibbles
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40cd1bdd by Simon Peyton Jones at 2023-04-25T00:16:00+01:00
Priorities non-rewritten equalities in the work list
Plus update error output
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30 changed files:
- .gitignore
- .gitlab-ci.yml
- .gitmodules
- cabal.project-reinstall
- compiler/GHC/Builtin/PrimOps.hs
- compiler/GHC/CmmToAsm/Wasm/FromCmm.hs
- compiler/GHC/CmmToAsm/Wasm/Types.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/InstEnv.hs
- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/Opt/SetLevels.hs
- compiler/GHC/Core/Opt/Simplify/Iteration.hs
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Core/Opt/WorkWrap/Utils.hs
- compiler/GHC/Core/Predicate.hs
- compiler/GHC/Core/Subst.hs
- compiler/GHC/Core/TyCo/FVs.hs
- compiler/GHC/Core/TyCo/Rep.hs
- compiler/GHC/Core/TyCo/Subst.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Type.hs-boot
- compiler/GHC/Core/Utils.hs
- compiler/GHC/Data/Bag.hs
- compiler/GHC/Data/Maybe.hs
- compiler/GHC/Driver/Config/Diagnostic.hs
- compiler/GHC/Driver/Config/Tidy.hs
- compiler/GHC/Driver/Errors.hs
The diff was not included because it is too large.
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/8e27d5409352d6c268d33d43c2b5c30fa42a2f43...40cd1bddd39b881a3f0cde10570556916adcf4e9
--
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/8e27d5409352d6c268d33d43c2b5c30fa42a2f43...40cd1bddd39b881a3f0cde10570556916adcf4e9
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