- May 08, 2024
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See the adjusted `Note [DataAlt occ info]`. This change also has a positive repercussion on `Note [Combine case alts: awkward corner]`. Fixes #24770. We now try not to call `dataConRepStrictness` in `adjustFieldsIdInfo` when all fields are lazy anyway, leading to a 2% ghc/alloc decrease in T9675. Metric Decrease: T9675 -
They are usually useless and doing so for data values comes with a large compile time/code size overhead. Fixes #24103
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- May 07, 2024
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Previously, C-- was processed with the C preprocessor program. This means that it inherited flags passed via -optc. A flag that is somewhat often passed through -optc is -g. At certain -g levels (>=2), GCC starts emitting defines *after* preprocessing, for the purposes of debug info generation. This is not useful for the C-- compiler, and, in fact, causes lexer errors. We can suppress this effect (safely, if supported) via -g0. As a workaround, in older versions of GCC (<=10), GCC only emitted defines if a certain set of -g*3 flags was passed. Newer versions check the debug level. For the former, we filter out those -g*3 flags and, for the latter, we specify -g0 on top of that. As a compatible and effective solution, this change adds a C-- preprocessor distinct from the C compiler and preprocessor, but that keeps its flags. The command line produced for C-- preprocessing now looks like: $pgmCmmP $optCs_without_g3 $g0_if_supported $optCmmP Closes: ghc/ghc#24474
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A future C-- test called T24474-cmm-override-g0 relies on the GCC-specific behaviour of -g3 implying -dD, which, in turn, leads to it emitting #defines past the preprocessing stage. Clang, at least, does not do this, so the test would fail if ran on Clang. As the behaviour here being tested is ``-optCmmP-g3'' undoing effects of the workaround we apply as a fix for bug #24474, and the workaround was for GCC-specific behaviour, the test needs to be marked as fragile on other compilers.
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- data Solo# a = (# a #) + data Solo# a = MkSolo# a And `(# foo #)` syntax now becomes just a syntactic sugar for `MkSolo# a`.
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- May 06, 2024
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Closes #24771
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...since none are present in the original MR !12463 fixing this issue.
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- May 05, 2024
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Closes #24753
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The `ghc-toolchain` overhaul will eventually replace all this stuff with something much more cleaned up, but I think it is still worth making this sort of cleanup in the meantime so other untanglings and dead code cleaning can procede. I was able to delete a fair amount of dead code doing this too. `LLVMTarget_CPP` is renamed to / merged with `LLVMTarget` because it wasn't actually turned into a valid CPP identifier. (Original to 1345c7cc, actually.) Progress on #23966 Co-Authored-By:
Sylvain Henry <hsyl20@gmail.com>
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Ticket #24768 showed that the Simplifier was accidentally destroying a join point. It turned out to be that we were sending a bottoming join point to the top, accidentally abstracting over /other/ join points. Easily fixed.
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Fix checkTyClHdr which was discarding comments. Closes #24755
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The Hadrian bootstrapping script relies upon `Setup.hs` to drive its build. Addresses #24761.
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closes issue #24732
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- May 04, 2024
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Alan Zimmerman authored
Closes #24754
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Unboxed sum constructors are now defined in the `GHC.Types` module, so if you manually quote an unboxed sum (e.g., `''Sum2#`), you will get a `Name` like: ```hs GHC.Types.Sum2# ``` The `unboxedSumTypeName` function in `template-haskell`, however, mistakenly believes that unboxed sum constructors are defined in `GHC.Prim`, so `unboxedSumTypeName 2` would return an entirely different `Name`: ```hs GHC.Prim.(#|#) ``` This is a problem for Template Haskell users, as it means that they can't be sure which `Name` is the correct one. (Similarly for `unboxedSumDataName`.) This patch fixes the implementations of `unboxedSum{Type,Data}Name` to use `GHC.Types` as the module. For consistency with `unboxedTupleTypeName`, the `unboxedSumTypeName` function now uses the non-punned syntax for unboxed sums (`Sum<N>#`) as the `OccName`. Fixes #24750. -
It has already manifested large fluctuations and destabilising CI Fixes #24762
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These are testing things which are sometimes out the control of a GHC developer. Therefore we shouldn't fail CI if something about these dependencies change because we can't do anything about it. It is still useful to have these statistics for visualisation in grafana though. Ticket #24759
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Closes #24749
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This patch makes use of scheduler.postTask() for JSFFI context switch when it's available. It's a more principled approach than our MessageChannel based setImmediate() implementation, and it's available in latest version of Chromium based browsers.
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As requested in #24528. ------------------------- Metric Decrease: ghc_bignum_so rts_so Metric Increase: cabal_syntax_dir rts_so time_dir time_so -------------------------
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This patch makes the driver always merge objects with `ld -r` when possible, and only fall back to calling `ar -L` when merge objects command is unavailable. This completely reverts !8887 and !12313, given more fixes in Cabal seems to be needed to avoid breaking certain configurations and the maintainence cost is exceeding the behefits in this case :/
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This documentation patch fixes a TODO left over from !12364
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Just for debugging, no effect on normal code
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This small patch fixes #24726, by tracking in-scope variables properly in -drule-check. Not hard to do!
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- May 02, 2024
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When a breakpoint is inlined, its context may change (e.g. tyvars in scope). We must take this into account and not used the breakpoint tick index as its sole identifier. Each instance of a breakpoint (even with the same tick index) now gets a different "info" index. We also need to distinguish modules: - tick module: module with the break array (tick counters, status, etc.) - info module: module having the CgBreakInfo (info at occurrence site)
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- closes #24191 - adds windows_skip, wasm_skip, wasm_arch, find_so, _find_so - path_from_ghcPkg, collect_size_ghc_pkg, collect_object_size, find_non_inplace functions to testsuite - adds on_windows and req_dynamic_ghc predicate to testsuite The design is to not make the testsuite too smart and simply offload to ghc-pkg for locations of object files and directories.
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In instance SDecide Nat where SZero %~ (SSucc _) = Disproved (\case) Ensure the span for the HsLam covers the full construct. Closes #24748 -
* Don't lock tvars when performing non-committal validation. * If we encounter a locked tvar don't consider it a failure. This means in-flight validation will only fail if committing at the moment of validation is *guaranteed* to fail. This prevents in-flight validation from failing spuriously if it happens in parallel on multiple threads or parallel to thread comitting.
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The STM code had a coarse grained locking mode guarded by #defines that was unused. This commit removes the code.
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It was introduced in base-4.20, not 4.22. Fix #24721
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Preserve comments in fun (Con {- c1 -} a b) = undefined Closes #24736
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- May 01, 2024
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