- Feb 28, 2021
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Found with ghc-debug on the ManyConstructors test
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This test flip-flops by +-1% in arbitrary changes in CI. While playing around with `-dunique-increment`, I could reproduce variations of 3% in compiler allocations, so I set the acceptance window accordingly. Fixes #19414.
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pprUserSpan, isZeroWidthSpan, pprLocated, combineRealSrcSpans
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Should fix failures on Windows: configure.ac:1511: error: ` ' is already registered with AC_CONFIG_FILES.
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Fixes #19423. [skip ci]
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The previous code using TyCoMapper could promote the same metavar twice. Use a set instead.
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As noted in #19102, we would previously ended up reboxing the tuple result of `split`'s worker and then immediately take apart the boxed tuple to again unpack it into an unboxed result. Fixes #19102.
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Following the example of Note [The one-shot state monad trick]. c.f. #18202.
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Following the example of Note [The one-shot state monad trick]. c.f. #18202. Metric Decrease: T17836 T3064 T5321FD T9872a T9872b T9872c T9872d
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- Feb 27, 2021
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Finally fixes #19025.
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The test probably could have used `usleep` from `unistd.h` instead, but this seemed like the simplest solution. Fixes #19431.
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Reduce XZ compression level for regular jobs (it is bumped to 9 for releases and nightly jobs). In my experiments I've got the following bindist size in the given time for each compression level (with the quick flavour): XZ_OPT Time Size -9 4m06s 112 MB -8 4m00s 114 MB -7 3m50s 116 MB -6 (default) 3m40s 118 MB -5 2m47s 123 MB -4 1m57s 134 MB -3 1m03s 129 MB -2 49.73s 136 MB -1 37.72s 142 MB -0 34.40s 156 MB
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When desugaring large overloaded literals we now avoid computing the `Rational` value. Instead prefering to store the significant and exponent as given where reasonable and possible. See Note [FractionalLit representation] for details.
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It should be left to tooling to perform the filtering to remove these specific closure types from the profile if desired. Fixes #16795
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This introduces a flag, --eventlog-flush-interval, which can be used to set an upper bound on the amount of time for which an eventlog event will remain enqueued. This can be useful in real-time monitoring settings.
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- Feb 26, 2021
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When using -fdicts-strict we generate references to absentError while compiling ghc-prim. However we always load ghc-prim before base so this caused linker errors. We simply solve this by moving absentError into ghc-prim. This does mean it's now a panic instead of an exception which can no longer be caught. But given that it should only be thrown if there is a compiler error that seems acceptable, and in fact we already do this for absentSumFieldError which has similar constraints.
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'Stream' is implemented in the "yoneda" style for efficiency. By representing a stream in this manner 'fmap' and '>>=' operations are accumulated in the function parameters before being applied once when the stream is destroyed. In the old implementation each usage of 'mapM' and '>>=' would traverse the entire stream in order to apply the substitution at the leaves. It is well-known for free monads that this representation can improve performance, and the test results demonstrate this for GHC as well. The operation mapAccumL is not used in the compiler and can't be implemented efficiently because it requires destroying and rebuilding the stream. I removed one use of mapAccumL_ which has similar problems but the other use was difficult to remove. In the future it may be worth exploring whether the 'Stream' encoding could be modified further to capture the mapAccumL pattern, and likewise defer the passing of accumulation parameter until the stream is finally consumed. The >>= operation for 'Stream' was a hot-spot in the ticky profile for the "ManyConstructors" test which called the 'cg' function many times in "StgToCmm.hs" Metric Decrease: ManyConstructors -
It was revealed in #19363 that the Template Haskell pretty-printer implemented in `Language.Haskell.TH.Ppr` did not pretty-print infix names or symbolic names correctly in certain situations, such as in data constructor declarations or fixity declarations. Easily fixed by using `pprName' Applied` (which always parenthesizes symbolic names in prefix position) or `pprName' Infix` (which always surrounds alphanumeric names with backticks in infix position) in the right spots. Fixes #19363.
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Fixes #18966. Adds a new warning -Wambiguous-fields for uses of field selectors or record updates that will be rejected in the future, when the DuplicateRecordFields extension is simplified per https://github.com/ghc-proposals/ghc-proposals/pull/366.
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Update the documentation to specify that MonoLocalBinds is lifted by a partial type signature. This came up in #19396. [skip ci]
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With this patch, everything built by the stage1 compiler (in a `ticky_ghc`-transformed flavour) will be built with `-ticky`. Fixes #19405.
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When desugaring ApplicativeDo, GHC looks up the name `fmap`, not `<$>` (see 'GHC.Builtin.Names.fmapName'). This commit fixes the misleading documentation; since exporting the name `<$>` instead of `fmap` causes a "not in scope" error when `QualifiedDo` and `ApplicativeDo` is combined. [skip ci]
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- Feb 24, 2021
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Ben Gamari authored
Due to #19025.
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Ben Gamari authored
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Ben Gamari authored
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Ben Gamari authored
Needed by #19025.
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Ben Gamari authored
This reverts commit 4a9d856d.
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- Feb 23, 2021
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Ben Gamari authored
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- Feb 22, 2021
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It makes the external package state independent of the home unit which is needed to make several home units share the EPS.
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alignment clearly should be a power of two. This patch makes it so. We do so by using the #alignment directive instead of using the size of the type.
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As noted in #18391, foreignInterruptible fails pretty regularly under GHCi.
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Before the change the error did not show details of involved module: ``` haddock: panic! (the 'impossible' happened) (GHC version 8.10.3: ModOrigin: hidden module redefined ``` After the change modile details are shown: ``` ghc-stage1: panic! (the 'impossible' happened) (GHC version 9.1.20210206: ModOrigin: package both exposed/hidden x: exposed package y: reexport by ghc-boot-9.1 ``` Fixes #19330 Signed-off-by:Sergei Trofimovich <slyfox@gentoo.org>
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