| Commit message (Collapse) | Author | Age | Files | Lines |
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This addresses some glaring omissions from
`libraries/base/changelog.md` and
`docs/users_guide/8.8.1-notes.rst`, fixing #16603 in the process.
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[skip ci]
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- fixes double mention of `traceBinaryEvent#` (the second one should be `traceEvent#`, I think)
- fixes note about `traceEvent#` taking a `String` - the docs say it takes a zero-terminated ByteString.
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Issues #12102 and #15872 revealed something strange about the way GHC
handles equality constraints in kinds: it treats them as _visible_
arguments! This causes a litany of strange effects, from strange
error messages
(https://gitlab.haskell.org/ghc/ghc/issues/12102#note_169035)
to bizarre `Eq#`-related things leaking through to GHCi output, even
without any special flags enabled.
This patch is an attempt to contain some of this strangeness.
In particular:
* In `TcHsType.etaExpandAlgTyCon`, we propagate through the
`AnonArgFlag`s of any `Anon` binders. Previously, we were always
hard-coding them to `VisArg`, which meant that invisible binders
(like those whose kinds were equality constraint) would mistakenly
get flagged as visible.
* In `ToIface.toIfaceAppArgsX`, we previously assumed that the
argument to a `FunTy` always corresponding to a `Required`
argument. We now dispatch on the `FunTy`'s `AnonArgFlag` and map
`VisArg` to `Required` and `InvisArg` to `Inferred`. As a
consequence, the iface pretty-printer correctly recognizes that
equality coercions are inferred arguments, and as a result,
only displays them in `-fprint-explicit-kinds` is enabled.
* Speaking of iface pretty-printing, `Anon InvisArg` binders were
previously being pretty-printed like `T (a :: b ~ c)`, as if they
were required. This seemed inconsistent with other invisible
arguments (that are printed like `T @{d}`), so I decided to switch
this to `T @{a :: b ~ c}`.
Along the way, I also cleaned up a minor inaccuracy in the users'
guide section for constraints in kinds that was spotted in
https://gitlab.haskell.org/ghc/ghc/issues/12102#note_136220.
Fixes #12102 and #15872.
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Besides the obvious benefits of being able to manipulate `TExp`'s of
unboxed types, this also simplified `-XDeriveLift` all while making
it more capable.
* `ghc-prim` is explicitly depended upon by `template-haskell`
* The following TH things are parametrized over `RuntimeRep`:
- `TExp(..)`
- `unTypeQ`
- `unsafeTExpCoerce`
- `Lift(..)`
* The following instances have been added to `Lift`:
- `Int#`, `Word#`, `Float#`, `Double#`, `Char#`, `Addr#`
- unboxed tuples of lifted types up to arity 7
- unboxed sums of lifted types up to arity 7
Ideally we would have levity-polymorphic _instances_ of unboxed
tuples and sums.
* The code generated by `-XDeriveLift` uses expression quotes
instead of generating large amounts of TH code and having
special hard-coded cases for some unboxed types.
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Document the ':set local-config' command and add a warning about
sourcing untrusted local .ghci scripts.
Related: https://gitlab.haskell.org/ghc/ghc/issues/6017
Related: https://gitlab.haskell.org/ghc/ghc/issues/14250
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Update users guide to match the new startup script order. Also
clarify that -ignore-dot-ghci does not apply to scripts specified
via the -ghci-script option.
Part of: https://gitlab.haskell.org/ghc/ghc/issues/14689
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-O2 is the highest value of optimization.
-O3 will be reverted to -O2.
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Intermediate STG does not contain free variables which can be useful
sometimes. So adding a flag to dump that info.
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As noted in #16309 this somehow went undocumented.
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We are currently ignoring options set in the hiDir field of hsc_dflags
when looking for interface files while compiling in OneShot mode. This
is inconsistent with the behaviour of other directory redirecting fields
(such as objectDir or hieDir). It is also inconsistent with the
behaviour of compilation in CompManager mode (a.k.a `ghc --make`) which
looks for interface files in the directory set in hidir flag. This
changes Finder.hs so that we use the value of hiDir while looking for
interface in OneShot mode.
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This moves URL references to old Trac to their corresponding
GitLab counterparts.
This patch does not update the submodule library, such as
libraries/Cabal.
See also !539, !606, !618
[ci skip]
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This commit includes the necessary changes in code and
documentation to support a primop that reverses a word's
bits. It also includes a test.
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This moves all URL references to Trac Wiki to their corresponding
GitLab counterparts.
This substitution is classified as follows:
1. Automated substitution using sed with Ben's mapping rule [1]
Old: ghc.haskell.org/trac/ghc/wiki/XxxYyy...
New: gitlab.haskell.org/ghc/ghc/wikis/xxx-yyy...
2. Manual substitution for URLs containing `#` index
Old: ghc.haskell.org/trac/ghc/wiki/XxxYyy...#Zzz
New: gitlab.haskell.org/ghc/ghc/wikis/xxx-yyy...#zzz
3. Manual substitution for strings starting with `Commentary`
Old: Commentary/XxxYyy...
New: commentary/xxx-yyy...
See also !539
[1]: https://gitlab.haskell.org/bgamari/gitlab-migration/blob/master/wiki-mapping.json
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Adds the mention that extensions "AllowAmbiguousTypes" and "RankNTypes"
are not always compatible with each other.
Specifies the conditions and causes of failing in resolving
of ambiguity.
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The user's guide uses the `ghc-wiki` macro, and substitution rules
are complicated. So I manually edited `.rst` files without sed.
I changed `Commentary/Latedmd` only to a different page.
It is more appropriate as an example.
[ci skip]
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This moves all URL references to Trac tickets to their corresponding
GitLab counterparts.
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The splitter is an evil Perl script that processes assembler code.
Its job can be done better by the linker's --gc-sections flag. GHC
passes this flag to the linker whenever -split-sections is passed on
the command line.
This is based on @DemiMarie's D2768.
Fixes Trac #11315
Fixes Trac #9832
Fixes Trac #8964
Fixes Trac #8685
Fixes Trac #8629
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This implements GHC proposal 35
(https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0035-forall-arrow.rst)
by adding the ability to write kinds with
visible dependent quantification (VDQ).
Most of the work for supporting VDQ was actually done _before_ this
patch. That is, GHC has been able to reason about kinds with VDQ for
some time, but it lacked the ability to let programmers directly
write these kinds in the source syntax. This patch is primarly about
exposing this ability, by:
* Changing `HsForAllTy` to add an additional field of type
`ForallVisFlag` to distinguish between invisible `forall`s (i.e,
with dots) and visible `forall`s (i.e., with arrows)
* Changing `Parser.y` accordingly
The rest of the patch mostly concerns adding validity checking to
ensure that VDQ is never used in the type of a term (as permitting
this would require full-spectrum dependent types). This is
accomplished by:
* Adding a `vdqAllowed` predicate to `TcValidity`.
* Introducing `splitLHsSigmaTyInvis`, a variant of `splitLHsSigmaTy`
that only splits invisible `forall`s. This function is used in
certain places (e.g., in instance declarations) to ensure that GHC
doesn't try to split visible `forall`s (e.g., if it tried splitting
`instance forall a -> Show (Blah a)`, then GHC would mistakenly
allow that declaration!)
This also updates Template Haskell by introducing a new `ForallVisT`
constructor to `Type`.
Fixes #16326. Also fixes #15658 by documenting this feature in the
users' guide.
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This adds trace messages that include the processes name and as such
make debugging and following the communication easier.
It also adds a note regarding the fwd*Call proxy-communication logic
between the proxy and the slave.
The proxy will now also poll for 60s to wait for the remote iserv
to come up. (Alternatively you can start the remote process
beforehand; and just have iserv-proxy connect to it)
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Implements GHC Proposal #24: .../ghc-proposals/blob/master/proposals/0024-no-kind-vars.rst
Fixes Trac #16334, Trac #16315
With this patch, scoping rules for type and kind variables have been
unified: kind variables no longer receieve special treatment. This
simplifies both the language and the implementation.
User-facing changes
-------------------
* Kind variables are no longer implicitly quantified when an explicit
forall is used:
p :: Proxy (a :: k) -- still accepted
p :: forall k a. Proxy (a :: k) -- still accepted
p :: forall a. Proxy (a :: k) -- no longer accepted
In other words, now we adhere to the "forall-or-nothing" rule more
strictly.
Related function: RnTypes.rnImplicitBndrs
* The -Wimplicit-kind-vars warning has been deprecated.
* Kind variables are no longer implicitly quantified in constructor
declarations:
data T a = T1 (S (a :: k) | forall (b::k). T2 (S b) -- no longer accepted
data T (a :: k) = T1 (S (a :: k) | forall (b::k). T2 (S b) -- still accepted
Related function: RnTypes.extractRdrKindSigVars
* Implicitly quantified kind variables are no longer put in front of
other variables:
f :: Proxy (a :: k) -> Proxy (b :: j)
f :: forall k j (a :: k) (b :: j). Proxy a -> Proxy b -- old order
f :: forall k (a :: k) j (b :: j). Proxy a -> Proxy b -- new order
This is a breaking change for users of TypeApplications. Note that
we still respect the dpendency order: 'k' before 'a', 'j' before 'b'.
See "Ordering of specified variables" in the User's Guide.
Related function: RnTypes.rnImplicitBndrs
* In type synonyms and type family equations, free variables on the RHS
are no longer implicitly quantified unless used in an outermost kind
annotation:
type T = Just (Nothing :: Maybe a) -- no longer accepted
type T = Just Nothing :: Maybe (Maybe a) -- still accepted
The latter form is a workaround due to temporary lack of an explicit
quantification method. Ideally, we would write something along these
lines:
type T @a = Just (Nothing :: Maybe a)
Related function: RnTypes.extractHsTyRdrTyVarsKindVars
* Named wildcards in kinds are fixed (Trac #16334):
x :: (Int :: _t) -- this compiles, infers (_t ~ Type)
Related function: RnTypes.partition_nwcs
Implementation notes
--------------------
* One of the key changes is the removal of FKTV in RnTypes:
- data FreeKiTyVars = FKTV { fktv_kis :: [Located RdrName]
- , fktv_tys :: [Located RdrName] }
+ type FreeKiTyVars = [Located RdrName]
We used to keep track of type and kind variables separately, but
now that they are on equal footing when it comes to scoping, we
can put them in the same list.
* extract_lty and family are no longer parametrized by TypeOrKind,
as we now do not distinguish kind variables from type variables.
* PatSynExPE and the related Note [Pattern synonym existentials do not scope]
have been removed (Trac #16315). With no implicit kind quantification,
we can no longer trigger the error.
* reportFloatingKvs and the related Note [Free-floating kind vars]
have been removed. With no implicit kind quantification,
we can no longer trigger the error.
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We no longer put class variables in front,
see "Taming the Kind Inference Monster"
(also fix some markup issues)
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The big payload of this patch is:
Add an AnonArgFlag to the FunTy constructor
of Type, so that
(FunTy VisArg t1 t2) means (t1 -> t2)
(FunTy InvisArg t1 t2) means (t1 => t2)
The big payoff is that we have a simple, local test to make
when decomposing a type, leading to many fewer calls to
isPredTy. To me the code seems a lot tidier, and probably
more efficient (isPredTy has to take the kind of the type).
See Note [Function types] in TyCoRep.
There are lots of consequences
* I made FunTy into a record, so that it'll be easier
when we add a linearity field, something that is coming
down the road.
* Lots of code gets touched in a routine way, simply because it
pattern matches on FunTy.
* I wanted to make a pattern synonym for (FunTy2 arg res), which
picks out just the argument and result type from the record. But
alas the pattern-match overlap checker has a heart attack, and
either reports false positives, or takes too long. In the end
I gave up on pattern synonyms.
There's some commented-out code in TyCoRep that shows what I
wanted to do.
* Much more clarity about predicate types, constraint types
and (in particular) equality constraints in kinds. See TyCoRep
Note [Types for coercions, predicates, and evidence]
and Note [Constraints in kinds].
This made me realise that we need an AnonArgFlag on
AnonTCB in a TyConBinder, something that was really plain
wrong before. See TyCon Note [AnonTCB InivsArg]
* When building function types we must know whether we
need VisArg (mkVisFunTy) or InvisArg (mkInvisFunTy).
This turned out to be pretty easy in practice.
* Pretty-printing of types, esp in IfaceType, gets
tidier, because we were already recording the (->)
vs (=>) distinction in an ad-hoc way. Death to
IfaceFunTy.
* mkLamType needs to keep track of whether it is building
(t1 -> t2) or (t1 => t2). See Type
Note [mkLamType: dictionary arguments]
Other minor stuff
* Some tidy-up in validity checking involving constraints;
Trac #16263
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-Wredundant-record-wildcards warns when a .. pattern binds no variables.
-Wunused-record-wildcards warns when none of the variables bound by a ..
pattern are used.
These flags are enabled by `-Wall`.
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This patch adds an optimization into the NCG: for large strings
(threshold configurable via -fbinary-blob-threshold=NNN flag), instead
of printing `.asciz "..."` in the generated ASM source, we print
`.incbin "tmpXXX.dat"` and we dump the contents of the string into a
temporary "tmpXXX.dat" file.
See the note for more details.
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#16248
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By default, when a module is compiled with plugins, it will be marked as
unsafe. With this flag passed, all plugins are treated as trustworthy
and the safety inference will no longer be affected.
This fixes Trac #16260.
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`-interactive-print` doesn't accept **expr** as `-e` or `:def` does. It must
be a qualified or unqualified **name** in scope.
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When loading many modules in parallel there can a lot of warnings and
errors get mixed up with regular output. When the compilation fails,
the relevant error message can be thousands of lines backward and is
hard to find. When the compilation successes, warning message is likely
to be ignored as it is not seen. We can address this by deferring the
warning and error message after the compilation. We also put errors
after warnings so it is more visible.
This idea was originally proposed by Bartosz Nitka in
https://phabricator.haskell.org/D4219.
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Summary:
This re-applies {D5195} with fixes for i386:
* Fix unused label warnings, see {D5230} or {D5273}
* Fix a silly bug introduced by moving `#if`
{P190}
Add a RTS option -xp to load PIC object anywhere in address space. We do
this by relaxing the requirement of <0x80000000 result of
`mmapForLinker` and implying USE_CONTIGUOUS_MMAP.
We also need to change calls to `ocInit` and `ocGetNames` to avoid
dangling pointers when the address of `oc->image` is changed by
`ocAllocateSymbolExtra`.
Test Plan:
See {D5195}, also test under i386:
```
$ uname -a
Linux watashi-arch32 4.18.5-arch1-1.0-ARCH #1 SMP PREEMPT Tue Aug 28
20:45:30 CEST 2018 i686 GNU/Linux
$ cd testsuite/tests/th/ && make test
...
```
will run `./validate` on stacked diff.
Reviewers: simonmar, bgamari, alpmestan, trommler, hvr, erikd
Reviewed By: simonmar
Subscribers: rwbarton, carter
Differential Revision: https://phabricator.haskell.org/D5289
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This commit relinquishes some some type information in `.hie` files in
exchange for better performance. See #16233 for more on this.
Using `.hie` files to generate hyperlinked sources is a crucial milestone
towards Hi Haddock (the initiative to move Haddock to work over `.hi`
files and embed docstrings in those). Unfortunately, even after much
optimization on the Haddock side, the `.hie` based solution is still
considerably slower and more memory hungry than the existing implementation
- and the @.hie@ code is to blame.
This changes `.hie` file generation to track type information for only
a limited subset of expressions (specifically, those that might eventually
turn into hyperlinks in the Haddock's hyperlinker backend).
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under -mbmi2
This works similarly to existing implementation for popCount.
Trac ticket: #16086.
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This reverts commit 76c8fd674435a652c75a96c85abbf26f1f221876.
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The rts option `-h` behaves as `-hT` when compiled without profiling,
and `-hc` when compiled with profiling. Add a note to the user's guide
highlighting this inconsistency.
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