| Commit message (Collapse) | Author | Age | Files | Lines |
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This is the first step of implementing:
https://github.com/ghc-proposals/ghc-proposals/pull/74
The main highlights/changes:
primops.txt.pp gets two new sections for two new primitive types for
signed and unsigned 8-bit integers (Int8# and Word8 respectively) along
with basic arithmetic and comparison operations. PrimRep/RuntimeRep get
two new constructors for them. All of the primops translate into the
existing MachOPs.
For CmmCalls the codegen will now zero-extend the values at call
site (so that they can be moved to the right register) and then truncate
them back their original width.
x86 native codegen needed some updates, since it wasn't able to deal
with the new widths, but all the changes are quite localized. LLVM
backend seems to just work.
This is the second attempt at merging this, after the first attempt in
D4475 had to be backed out due to regressions on i386.
Bumps binary submodule.
Signed-off-by: Michal Terepeta <michal.terepeta@gmail.com>
Test Plan: ./validate (on both x86-{32,64})
Reviewers: bgamari, hvr, goldfire, simonmar
Subscribers: rwbarton, carter
Differential Revision: https://phabricator.haskell.org/D5258
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The quirk caused an issue where GHC concluded that 'D' is possibly
unifiable with 'D a' (the two types could have the same kind if D is a
data family).
Test Plan:
Ensure T9371 stays fixed.
Introduce T15704
Reviewers: goldfire, bgamari
Reviewed By: goldfire
Subscribers: RyanGlScott, rwbarton, carter
GHC Trac Issues: #15704
Differential Revision: https://phabricator.haskell.org/D5206
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Summary:
This change to the valid hole fits adds built-in syntax candidates (like (:) and []),
so that they are checked in addition to what is in scope.
The rest is merely a refactor and export of the functions used to find the valid
hole fits, since there was interest at ICFP to use the valid hole fit machinery for
additional uses. By exporting the `tcFilterHoleFits` function, this can now be done
without having to rely on parsing the actual error message.
Test Plan: Test for built-in syntax included
Reviewers: bgamari
Reviewed By: bgamari
Subscribers: RyanGlScott, rwbarton, carter
Differential Revision: https://phabricator.haskell.org/D5227
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Test Plan: Validate
Reviewers: goldfire, bgamari
Subscribers: osa1, mpickering, rwbarton, carter
Differential Revision: https://phabricator.haskell.org/D5221
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newFamInst lints its types. This is good. But it's not so good
when there have been errors and thus recovery tycons are about.
So we now don't.
Fixes #15796.
Test case: typecheck/should_fail/T15796
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The function TcHsType.failIfEmitsConstraints says that it fails.
It even does so in its name. But it didn't! It *reported* constraints
but didn't fail. Now it does.
This is important in tcHsClsInstType; see the comments therein.
This was discovered while looking at #15797, but that ticket
requires visible kind application to exhibit the bug; the test
case will come with the patch for #12045.
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Previously, I had inexplicably decided that (->)'s roles
were all Representational. But, of course, its first two
parameters are *dependent* RuntimeReps. All dependent parameters
have a Nominal role, because all roles in kinds are Nominal.
Fix is easy, but I have no idea how the world hasn't come
crashing down before now.
This was found while investigating #15801, which requires
visible type application in types to observe. Hence, the test
case will come with the main patch for #12045.
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An unfortunate consequence of commit
b9483981d128f55d8dae3f434f49fa6b5b30c779 (`Remove HsEqTy and XEqTy`)
is infix uses of `~` in TH quotes now desugar differently than
before. In particular, we have that:
```haskell
a ~ (Int -> Int)
```
Now desugars to:
```haskell
HsOpTy a (~) (HsOpTy Int (->) Int)
```
Which GHC interprets as being:
```haskell
a ~ Int -> Int
```
Or, equivalently:
```haskell
(a ~ Int) -> Int
```
Which is different than what was intended! This is the cause
of #15815.
All of this has revealed that we likely need to renovate the way we
desugar infix type operators to be more consistent with the treatment
for infix expressions (see
https://ghc.haskell.org/trac/ghc/ticket/15815#comment:5 for more on
this.) Doing so would constitute a breaking change, however, so we
will likely want to wait until another major GHC release to do this.
In the meantime, this patch offers a non-invasive change to the way
that infix uses of `~` are desugared. This makes the program
in #15815 compile again by inserting extra `HsParTy`s around the
arguments to `~` if they are lacking them.
Test Plan: make test TEST=T15815
Reviewers: int-index, goldfire, bgamari
Reviewed By: int-index
Subscribers: int-e, rwbarton, carter
GHC Trac Issues: #15815
Differential Revision: https://phabricator.haskell.org/D5274
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This reverts commit 3a51abd04432ea3d13e4ea3c5a592f038bd57432.
I had hit the wrong button when trying to validate the original
commit... and ended up committing it prematurely instead.
This reversion commit
also updates the comments to explain why we kind-generalise.
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There is no need to kind-generalise in tcRnType. Types are not
instantiated eagerly, so there's never anything to generalise.
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In type-incorrect code, we can sometimes let a coercion
hole make it through the zonker. If this coercion hole then
ends up in the environment (e.g., in the type of a data
constructor), then it causes trouble later.
This patch avoids trouble by substituting the coercion hole
for its representative CoVar. Really, any coercion would do,
but the CoVar was very handy.
test case: polykinds/T15787
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The real change that fixes the ticket is described in
Note [Naughty quantification candidates] in TcMType.
Fixing this required reworking candidateQTyVarsOfType, the function
that extracts free variables as candidates for quantification.
One consequence is that we now must be more careful when quantifying:
any skolems around must be quantified manually, and quantifyTyVars
will now only quantify over metavariables. This makes good sense,
as skolems are generally user-written and are listed in the AST.
As a bonus, we now have more control over the ordering of such
skolems.
Along the way, this commit fixes #15711 and refines the fix
to #14552 (by accepted a program that was previously rejected,
as we can now accept that program by zapping variables to Any).
This commit also does a fair amount of rejiggering kind inference
of datatypes. Notably, we now can skip the generalization step
in kcTyClGroup for types with CUSKs, because we get the
kind right the first time. This commit also thus fixes #15743 and
#15592, which both concern datatype kind generalisation.
(#15591 is also very relevant.) For this aspect of the commit, see
Note [Required, Specified, and Inferred in types] in TcTyClsDecls.
Test cases: dependent/should_fail/T14880{,-2},
dependent/should_fail/T15743[cd]
dependent/should_compile/T15743{,e}
ghci/scripts/T15743b
polykinds/T15592
dependent/should_fail/T15591[bc]
ghci/scripts/T15591
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Summary:
Commit 512eeb9bb9a81e915bfab25ca16bc87c62252064
(`More explicit foralls (GHC Proposal 0007)`) introduced breaking
changes to the Template Haskell AST. As a consequence of this, there
are libraries in the wild that now fail to build on GHC HEAD (for
instance, `th-abstraction`).
This properly bumps the `template-haskell` library's version number
to `2.15.0.0` so that these libraries can guard against these changes
using `MIN_VERSION_template_haskell`.
Test Plan: ./validate
Reviewers: bgamari
Reviewed By: bgamari
Subscribers: rwbarton, carter
GHC Trac Issues: #15818
Differential Revision: https://phabricator.haskell.org/D5272
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Summary:
Reimplement global FastString table using a concurrent hashatable with
fixed size segments and dynamically growing buckets instead of fixed size
buckets.
This addresses the problem that `mkFastString` was not linear when the
total number of entries was large.
Test Plan:
./validate
```
inplace/bin/ghc-stage2 --interactive -dfaststring-stats < /dev/null
GHCi, version 8.7.20181005: http://www.haskell.org/ghc/ :? for help
Prelude> Leaving GHCi.
FastString stats:
segments: 256
buckets: 16384
entries: 7117
largest segment: 64
smallest segment: 64
longest bucket: 5
has z-encoding: 0%
```
Also comapre the two implementation using
{P187}
The new implementation is on a par with the old version with different
conbination of parameters and perform better when the number of
FastString's are large.
{P188}
Reviewers: simonmar, bgamari, niteria
Reviewed By: simonmar, bgamari
Subscribers: rwbarton, carter
GHC Trac Issues: #14854
Differential Revision: https://phabricator.haskell.org/D5211
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Summary:
Previously the TcPlugin and CorePlugin type synonyms were not exporting,
resulting in much confusion.
Reviewers: mpickering
Reviewed By: mpickering
Subscribers: rwbarton, carter
Differential Revision: https://phabricator.haskell.org/D5237
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Summary:
on windows, plugins are loaded via .a files,
but those paths were not being searched when loading plugins
Test Plan: ./validate
Reviewers: Phyx, bgamari
Reviewed By: Phyx
Subscribers: RyanGlScott, rwbarton, carter
GHC Trac Issues: #15700
Differential Revision: https://phabricator.haskell.org/D5253
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Summary:
This patch fixes #15805, where we found that
`TcType.anyRewritableTyVar` has one wrong case.
Besides the fix, it also:
- removed some unnecessary `ASSERT2(tcIsTcTyVar...)` in `TcType`, as now we have
`tcIsTcTyVar = isTyVar`.
- fixed some comments
Test Plan: ./validate
Reviewers: goldfire, simonpj, bgamari
Reviewed By: simonpj
Subscribers: rwbarton, carter
GHC Trac Issues: #15805
Differential Revision: https://phabricator.haskell.org/D5263
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Summary:
This patch fixes #15806, where we found that the `:k` command in GHCi
misses a validity checking for the type.
Missing validity checking causes `:k` to accept types that are not validated.
For example, `:k (Maybe (forall a. a -> a))` (incorrectly) returns `*`, while
impredictivity of type instantiation shouldn't be allowed.
Test Plan: ./validate
Reviewers: simonpj, goldfire, bgamari
Reviewed By: bgamari
Subscribers: rwbarton, carter
GHC Trac Issues: #15806
Differential Revision: https://phabricator.haskell.org/D5265
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Summary:
Encountered assembly error due to undefined label `.LcaDcU_info_end` for
following code generated by `pprFrameProc`:
```
.Lsat_sa8fp{v}_info_fde_end:
.long .Lblock{v caDcU}_info_fde_end-.Lblock{v caDcU}_info_fde
.Lblock{v caDcU}_info_fde:
.long _nbHlD-.Lsection_frame
.quad block{v caDcU}_info-1
.quad .Lblock{v caDcU}_info_end-block{v caDcU}_info+1
.byte 1
```
This diff fixed the error.
Test Plan:
./validate
Also the case where we used to have assembly error is now fixed.
Unfortunately, I have limited insight here and cannot get a small enough repro
or test case for this.
Ben says:
> I think I see: Previously we only produced end symbols for the info
> tables of top-level procedures. However, blocks within a procedure may
> also have info tables, we will dutifully generate debug information for
> and consequently we get undefined symbols.
Reviewers: simonmar, scpmw, last_g, bgamari
Reviewed By: bgamari
Subscribers: rwbarton, carter
Differential Revision: https://phabricator.haskell.org/D5246
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We now calculate the SSE register padding needed to fix the calling
convention in LLVM in a robust way: grouping them by whether
registers in that class overlap (with the same class overlapping
itself).
My prior patch assumed that no matter the platform, physical
register Fx aliases with Dx, etc, for our calling convention.
This is unfortunately not the case for any platform except x86-64.
Test Plan:
Only know how to test on x86-64, but it should be tested on ARM with:
`make test WAYS=llvm && make test WAYS=optllvm`
Reviewers: bgamari, angerman
Reviewed By: bgamari
Subscribers: rwbarton, carter
GHC Trac Issues: #15780, #14251, #15747
Differential Revision: https://phabricator.haskell.org/D5254
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Allow the user to explicitly bind type/kind variables in type and data
family instances (including associated instances), closed type family
equations, and RULES pragmas. Follows the specification of GHC
Proposal 0007, also fixes #2600. Advised by Richard Eisenberg.
This modifies the Template Haskell AST -- old code may break!
Other Changes:
- convert HsRule to a record
- make rnHsSigWcType more general
- add repMaybe to DsMeta
Includes submodule update for Haddock.
Test Plan: validate
Reviewers: goldfire, bgamari, alanz
Subscribers: simonpj, RyanGlScott, goldfire, rwbarton,
thomie, mpickering, carter
GHC Trac Issues: #2600, #14268
Differential Revision: https://phabricator.haskell.org/D4894
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Consider the type
forall k. b -> k
where
b :: k -> Type
Here the 'k' in b's kind must be a different 'k' to the forall k,
because 'b' is free in the expression. So we must return 'k'
among the free vars returned from tyCoVarsOfType applied that
type. But we weren't.
This is an outright bug, although we don't have a program that
fails because of it.
It's easy to fix, too: see TyCoRep
Note [Closing over free variable kinds]
This fix has been in the pipeline for ages because it fell into
the Trac #14880 swamp. But this patch nails it.
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Fixing the way that we close-over-kinds when taking the
free vars of a type revealed that the way we generalise
type constructors was a bit wrong.
This fixes it. See TcTyClDecls
Note [Generalisation for type constructors]
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As Trac #15765 says, Once upon a time, the extract functions
at the bottom of RnTypes were pure. Then, along came -XTypeInType,
which needed to do a check in these functions for users mixing
type variables with kind variables.
Now, however, with -XTypeInType gone again, we no longer
do this check. Thus, there is no reason to keep these
functions monadic.
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This patch fixes Trac #15778 by removing a zonkTcTyVarToTyVar
from tcHsSigType.
Nww that a pattern-bound type variable can refer to a type, it's
obvoiusly wrong to expect it to be a TyVar! Moreover, that zonk
is entirely unnecessary.
I added a new Note [Type variables in the type environment]
in TcRnTypes
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This just improves docmentation for the fix to Trac #15300
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Change some URLs from hackage.haskell.org/trac to ghc.haskell.org/trac
Test Plan: manually verify links work
Reviewers: bgamari, simonmar, mpickering
Reviewed By: bgamari, mpickering
Subscribers: mpickering, rwbarton, carter
GHC Trac Issues: #15733
Differential Revision: https://phabricator.haskell.org/D5257
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In TcSimplify.neededEvVars, in add_implic_seeds we were
deleting the 'givens'; but they are already deleted, so
this is a no-op. This patch just remove the redundant
delete.
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This is a debug-only change
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We suppress some Given errors; see Note [Given errors]
in TcErrors. But we must be careful not to suppress
Wanted errors because of the presence of these Given
errors -- else we might allow compilation to bogusly
proceed
The rubber hits the road in TcRnTypes.insolubleCt,
where we don't want to treat Givens as insoluble,
nor (and this is the new bit) Deriveds that arise
from Givens. See Note [Given insolubles] in TcRnTypes.
This fixes #15767.
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A debug-print was trying to print the coercion returned
by the flattener. But that coercion can be undefined
in the case of Derived constraints. Because we might
rewrite it with [D] a ~ ty, and there is no evidence
for that.
Solution: don't attempt to print the coercion.
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Trac #15694 showed that we were forgetting to solve
the equalities of a pattern signature until too late.
Result: WARNINGs and a panic:
"Type-correct unfilled coercion hole"
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Trac #15648 showed that GHC was a bit confused about the
difference between the types for
* Predicates
* Coercions
* Evidence (in the typechecker constraint solver)
This patch cleans it up. See especially Type.hs
Note [Types for coercions, predicates, and evidence]
Particular changes
* Coercion types (a ~# b) and (a ~#R b) are not predicate types
(so isPredTy reports False for them) and are not implicitly
instantiated by the type checker. This is a real change, but
it consistently reflects that fact that (~#) and (~R#) really
are different from predicates.
* isCoercionType is renamed to isCoVarType
* During type inference, simplifyInfer, we do /not/ want to infer
a constraint (a ~# b), because that is no longer a predicate type.
So we 'lift' it to (a ~ b). See TcType
Note [Lift equality constaints when quantifying]
* During type inference for pattern synonyms, we need to 'lift'
provided constraints of type (a ~# b) to (a ~ b). See
Note [Equality evidence in pattern synonyms] in PatSyn
* But what about (forall a. Eq a => a ~# b)? Is that a
predicate type? No -- it does not have kind Constraint.
Is it an evidence type? Perhaps, but awkwardly so.
In the end I decided NOT to make it an evidence type,
and to ensure the the type inference engine never
meets it. This made me /simplify/ the code in
TcCanonical.makeSuperClasses; see TcCanonical
Note [Equality superclasses in quantified constraints]
Instead I moved the special treatment for primitive
equality to TcInteract.doTopReactOther. See TcInteract
Note [Looking up primitive equalities in quantified constraints]
Also see Note [Evidence for quantified constraints] in Type.
All this means I can have
isEvVarType ty = isCoVarType ty || isPredTy ty
which is nice.
All in all, rather a lot of work for a small refactoring,
but I think it's a real improvement.
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This patch makes a number of improvements to the output
generated by -ddump-types
* Prints data constructor separately
* Omits empty chunks of output
I was driven initially by the unhelpful existing output for
data constructors, but ended up doing some refactoring.
Lots of error message wibbles, but nothing significant.
Certainly no change in user behaviour.
(NB: It is just possible that I have failed to cleanly
separate this patch from the next one, about
isPredTy and friends.)
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Summary:
The `reifyType` function in `TcSplice` is carefully designed
to avoid reifying visible arguments to `TyConApp`s. However, the same
care was not given towards the `AppTy` case, which lead to #15792.
This patch changes to the `AppTy` case of `reifyType` so that it
consults the kind of the function type to determine which of the
argument types are invisible (and therefore should be dropped) during
reification. This required crafting a variant of `tyConArgFlags`,
which I dubbed `appTyArgFlags`, that accept an arbitrary function
`Type` instead of a `TyCon`.
Test Plan: make test TEST=T15792
Reviewers: goldfire, bgamari, simonpj
Reviewed By: simonpj
Subscribers: simonpj, rwbarton, carter
GHC Trac Issues: #15792
Differential Revision: https://phabricator.haskell.org/D5252
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Summary:
When renaming untyped TH quotes, some care is taken to
ensure that uses of top-level names in quotes do not have their
bindings discarded during desugaring. The same care was not applied
to typed TH quotes, so this patch brings the two into sync.
Test Plan: make test TEST=T15783
Reviewers: bgamari, mpickering
Reviewed By: mpickering
Subscribers: mpickering, rwbarton, carter
GHC Trac Issues: #15783
Differential Revision: https://phabricator.haskell.org/D5248
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Summary:
This is a follow-up to D5173, which permitted
unparenthesized kind signatures in certain places. One place that
appeared to be overlooked was the right-hand sides of type synonyms,
which this patch addresses by introducing a `ktypedoc` parser
production (which is to `ctypdoc` as `ktype` is to `ctype`) and
using it in the right place.
Test Plan: make test TEST="KindSigs T15781"
Reviewers: harpocrates, bgamari
Reviewed By: harpocrates
Subscribers: rwbarton, mpickering, carter
GHC Trac Issues: #15781
Differential Revision: https://phabricator.haskell.org/D5245
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Summary:
In ALR, 'ITlcase' should expect an opening curly. This is probably a forgotten
edge case in ALR, since `maybe_layout` (which handles the non-ALR layout)
already deals with the 'ITlcase' token properly.
Test Plan: make TEST=T10453 && make TEST=T13087
Reviewers: bgamari, RyanGlScott
Reviewed By: RyanGlScott
Subscribers: RyanGlScott, rwbarton, carter
GHC Trac Issues: #10453, #13087
Differential Revision: https://phabricator.haskell.org/D5236
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Comments only: [skip ci]
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Summary:
For the sake of consistency of the dependent core, there is a restriction on
where a coercion variable can appear in ForAllCo: the coercion variable can
appear nowhere except in coherence coercions.
Currently this restriction is missing in Core. The goal of this patch is to add
the missing restriction.
After discussion, we decide: coercion variables can appear nowhere except in
`GRefl` and `Refl`. Relaxing the restriction to include `Refl` should not break
consistency, we premuse.
Test Plan: ./validate
Reviewers: goldfire, simonpj, bgamari
Reviewed By: goldfire
Subscribers: rwbarton, carter
GHC Trac Issues: #15757
Differential Revision: https://phabricator.haskell.org/D5231
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This was just a pretty-printer infelicity. Fixed now.
Test case: printer/T15761
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When inspecing a BLACKHOLE if the BLACKHOLE points to a TSO or a
BLOCKING_QUEUE we should return a suspension to the BLACKHOLE itself
(instead of returning a suspension to the indirectee). The reason is
because in the debugger when we want to evaluate this term we need to
enter the BLACKHOLE and not to the TSO or BLOCKING_QUEUE. See the
runtime panic caused by this in #8316.
Note that while with this patch we do the right thing to evaluate
thunks in GHCi, evaluating thunks that are owned by the evaluator thread
in a breakpoint will cause a deadlock as we don't release the breakMVar,
which is what blocks the evaluator thread from continuing with
evaluation. So the GHCi thread will enter the BLACKHOLE, but owner of
the BLACKHOLE is also blocked.
Reviewers: simonmar, hvr, bgamari
Reviewed By: bgamari
Subscribers: rwbarton, carter
GHC Trac Issues: #8316
Differential Revision: https://phabricator.haskell.org/D5179
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We used to always generate direct access for cost centre labels. We
fixed this by generating indirect data load for cost centre defined in
external module.
Test Plan:
The added test used to fail with error message
```
/bin/ld.gold: error: T15723B.o: requires dynamic R_X86_64_PC32 reloc
against 'T15723A_foo1_EXPR_cc' which may overflow at runtime; recompile
with -fPIC
```
and now passes.
Also check that `R_X86_64_PC32` is generated for CostCentre from the
same module and `R_X86_64_GOTPCREL` is generated for CostCentre from
external module:
```
$ objdump -rdS T15723B.o
0000000000000028 <T15723B_test_info>:
28: 48 8d 45 f0 lea -0x10(%rbp),%rax
2c: 4c 39 f8 cmp %r15,%rax
2f: 72 70 jb a1 <T15723B_test_info+0x79>
31: 48 83 ec 08 sub $0x8,%rsp
35: 48 8d 35 00 00 00 00 lea 0x0(%rip),%rsi # 3c
<T15723B_test_info+0x14>
38: R_X86_64_PC32
T15723B_test1_EXPR_cc-0x4
3c: 49 8b bd 60 03 00 00 mov 0x360(%r13),%rdi
43: 31 c0 xor %eax,%eax
45: e8 00 00 00 00 callq 4a <T15723B_test_info+0x22>
46: R_X86_64_PLT32 pushCostCentre-0x4
4a: 48 83 c4 08 add $0x8,%rsp
4e: 48 ff 40 30 incq 0x30(%rax)
52: 49 89 85 60 03 00 00 mov %rax,0x360(%r13)
59: 48 83 ec 08 sub $0x8,%rsp
5d: 49 8b bd 60 03 00 00 mov 0x360(%r13),%rdi
64: 48 8b 35 00 00 00 00 mov 0x0(%rip),%rsi # 6b
<T15723B_test_info+0x43>
67: R_X86_64_GOTPCREL T15723A_foo1_EXPR_cc-0x4
6b: 31 c0 xor %eax,%eax
6d: e8 00 00 00 00 callq 72 <T15723B_test_info+0x4a>
6e: R_X86_64_PLT32 pushCostCentre-0x4
72: 48 83 c4 08 add $0x8,%rsp
76: 48 ff 40 30 incq 0x30(%rax)
```
Reviewers: simonmar, bgamari
Reviewed By: simonmar
Subscribers: rwbarton, carter
GHC Trac Issues: #15723
Differential Revision: https://phabricator.haskell.org/D5214
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