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* Add test for T21682wip/T21682Matthew Pickering2022-06-062-0/+4
| | | | Fixes #21682
* HsToCore.Coverage: Purge DynFlagswip/coverage-configJohn Ericson2022-06-022-2/+4
| | | | | | Finishes what !7467 (closed) started. Progress towards #17957
* Make -fcompact-unwind the defaultMatthew Pickering2022-06-011-3/+2
| | | | | | | | This is a follow-up to !7247 (closed) making the inclusion of compact unwinding sections the default. Also a slight refactoring/simplification of the flag handling to add -fno-compact-unwind.
* Bump bytestring, process, and text submodulesBen Gamari2022-06-011-1/+1
| | | | | | | | | Metric Decrease: T5631 Metric Increase: T18223 (cherry picked from commit 55fcee30cb3281a66f792e8673967d64619643af)
* Add test for #21619Matthew Pickering2022-06-012-0/+11
| | | | Fixes #21619
* TTG: Rework and improve splicesromes2022-06-019-66/+93
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This commit redefines the structure of Splices in the AST. We get rid of `HsSplice` which used to represent typed and untyped splices, quasi quotes, and the result of splicing either an expression, a type or a pattern. Instead we have `HsUntypedSplice` which models an untyped splice or a quasi quoter, which works in practice just like untyped splices. The `HsExpr` constructor `HsSpliceE` which used to be constructed with an `HsSplice` is split into `HsTypedSplice` and `HsUntypedSplice`. The former is directly constructed with an `HsExpr` and the latter now takes an `HsUntypedSplice`. Both `HsType` and `Pat` constructors `HsSpliceTy` and `SplicePat` now take an `HsUntypedSplice` instead of a `HsSplice` (remember only /untyped splices/ can be spliced as types or patterns). The result of splicing an expression, type, or pattern is now comfortably stored in the extension fields `XSpliceTy`, `XSplicePat`, `XUntypedSplice` as, respectively, `HsUntypedSpliceResult (HsType GhcRn)`, `HsUntypedSpliceResult (Pat GhcRn)`, and `HsUntypedSpliceResult (HsExpr GhcRn)` Overall the TTG extension points are now better used to make invalid states unrepresentable and model the progression between stages better. See Note [Lifecycle of an untyped splice, and PendingRnSplice] and Note [Lifecycle of an typed splice, and PendingTcSplice] for more details. Updates haddock submodule Fixes #21263 ------------------------- Metric Decrease: hard_hole_fits -------------------------
* Purge `DynFlags` and `HscEnv` from some `GHC.Core` modules where it's not ↵wip/dflags-core-opt-easierJohn Ericson2022-05-312-2/+4
| | | | | | | | | | | | | | | | | too hard Progress towards #17957 Because of `CoreM`, I did not move the `DynFlags` and `HscEnv` to other modules as thoroughly as I usually do. This does mean that risk of `DynFlags` "creeping back in" is higher than it usually is. After we do the same process to the other Core passes, and then figure out what we want to do about `CoreM`, we can finish the job started here. That is a good deal more work, however, so it certainly makes sense to land this now.
* A bunch of changes related to eta reductionSimon Peyton Jones2022-05-3021-434/+415
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is a large collection of changes all relating to eta reduction, originally triggered by #18993, but there followed a long saga. Specifics: * Move state-hack stuff from GHC.Types.Id (where it never belonged) to GHC.Core.Opt.Arity (which seems much more appropriate). * Add a crucial mkCast in the Cast case of GHC.Core.Opt.Arity.eta_expand; helps with T18223 * Add clarifying notes about eta-reducing to PAPs. See Note [Do not eta reduce PAPs] * I moved tryEtaReduce from GHC.Core.Utils to GHC.Core.Opt.Arity, where it properly belongs. See Note [Eta reduce PAPs] * In GHC.Core.Opt.Simplify.Utils.tryEtaExpandRhs, pull out the code for when eta-expansion is wanted, to make wantEtaExpansion, and all that same function in GHC.Core.Opt.Simplify.simplStableUnfolding. It was previously inconsistent, but it's doing the same thing. * I did a substantial refactor of ArityType; see Note [ArityType]. This allowed me to do away with the somewhat mysterious takeOneShots; more generally it allows arityType to describe the function, leaving its clients to decide how to use that information. I made ArityType abstract, so that clients have to use functions to access it. * Make GHC.Core.Opt.Simplify.Utils.rebuildLam (was stupidly called mkLam before) aware of the floats that the simplifier builds up, so that it can still do eta-reduction even if there are some floats. (Previously that would not happen.) That means passing the floats to rebuildLam, and an extra check when eta-reducting (etaFloatOk). * In GHC.Core.Opt.Simplify.Utils.tryEtaExpandRhs, make use of call-info in the idDemandInfo of the binder, as well as the CallArity info. The occurrence analyser did this but we were failing to take advantage here. In the end I moved the heavy lifting to GHC.Core.Opt.Arity.findRhsArity; see Note [Combining arityType with demand info], and functions idDemandOneShots and combineWithDemandOneShots. (These changes partly drove my refactoring of ArityType.) * In GHC.Core.Opt.Arity.findRhsArity * I'm now taking account of the demand on the binder to give extra one-shot info. E.g. if the fn is always called with two args, we can give better one-shot info on the binders than if we just look at the RHS. * Don't do any fixpointing in the non-recursive case -- simple short cut. * Trim arity inside the loop. See Note [Trim arity inside the loop] * Make SimpleOpt respect the eta-reduction flag (Some associated refactoring here.) * I made the CallCtxt which the Simplifier uses distinguish between recursive and non-recursive right-hand sides. data CallCtxt = ... | RhsCtxt RecFlag | ... It affects only one thing: - We call an RHS context interesting only if it is non-recursive see Note [RHS of lets] in GHC.Core.Unfold * Remove eta-reduction in GHC.CoreToStg.Prep, a welcome simplification. See Note [No eta reduction needed in rhsToBody] in GHC.CoreToStg.Prep. Other incidental changes * Fix a fairly long-standing outright bug in the ApplyToVal case of GHC.Core.Opt.Simplify.mkDupableContWithDmds. I was failing to take the tail of 'dmds' in the recursive call, which meant the demands were All Wrong. I have no idea why this has not caused problems before now. * Delete dead function GHC.Core.Opt.Simplify.Utils.contIsRhsOrArg Metrics: compile_time/bytes allocated Test Metric Baseline New value Change --------------------------------------------------------------------------------------- MultiLayerModulesTH_OneShot(normal) ghc/alloc 2,743,297,692 2,619,762,992 -4.5% GOOD T18223(normal) ghc/alloc 1,103,161,360 972,415,992 -11.9% GOOD T3064(normal) ghc/alloc 201,222,500 184,085,360 -8.5% GOOD T8095(normal) ghc/alloc 3,216,292,528 3,254,416,960 +1.2% T9630(normal) ghc/alloc 1,514,131,032 1,557,719,312 +2.9% BAD parsing001(normal) ghc/alloc 530,409,812 525,077,696 -1.0% geo. mean -0.1% Nofib: Program Size Allocs Runtime Elapsed TotalMem -------------------------------------------------------------------------------- banner +0.0% +0.4% -8.9% -8.7% 0.0% exact-reals +0.0% -7.4% -36.3% -37.4% 0.0% fannkuch-redux +0.0% -0.1% -1.0% -1.0% 0.0% fft2 -0.1% -0.2% -17.8% -19.2% 0.0% fluid +0.0% -1.3% -2.1% -2.1% 0.0% gg -0.0% +2.2% -0.2% -0.1% 0.0% spectral-norm +0.1% -0.2% 0.0% 0.0% 0.0% tak +0.0% -0.3% -9.8% -9.8% 0.0% x2n1 +0.0% -0.2% -3.2% -3.2% 0.0% -------------------------------------------------------------------------------- Min -3.5% -7.4% -58.7% -59.9% 0.0% Max +0.1% +2.2% +32.9% +32.9% 0.0% Geometric Mean -0.0% -0.1% -14.2% -14.8% -0.0% Metric Decrease: MultiLayerModulesTH_OneShot T18223 T3064 T15185 T14766 Metric Increase: T9630
* export IsList from GHC.IsListTeo Camarasu2022-05-295-11/+11
| | | | it is still re-exported from GHC.Exts
* T16875: Stabilise (temporarily) by increasing acceptance thresholdMatthew Pickering2022-05-281-1/+3
| | | | | | | | | The theory is that on windows there is some difference in the environment between pipelines on master and merge requests which affects all tests equally but because T16875 barely allocates anything it is the test which is affected the most. See #21557
* Fix FreeVars computation for mdosheaf2022-05-282-0/+18
| | | | | | | | | | | | Commit acb188e0 introduced a regression in the computation of free variables in mdo statements, as the logic in GHC.Rename.Expr.segmentRecStmts was slightly different depending on whether the recursive do block corresponded to an mdo statement or a rec statment. This patch restores the previous computation for mdo blocks. Fixes #21654
* Use a class to check validity of withDictwip/withdictKrzysztof Gogolewski2022-05-2715-41/+87
| | | | | | | | | | | | This moves handling of the magic 'withDict' function from the desugarer to the typechecker. Details in Note [withDict]. I've extracted a part of T16646Fail to a separate file T16646Fail2, because the new error in 'reify' hides the errors from 'f' and 'g'. WithDict now works with casts, this fixes #21328. Part of #19915
* Generalize breakTyVarCycle to work with TyFamLHSRichard Eisenberg2022-05-264-1/+64
| | | | | | | | | | | | | | | | | The function breakTyVarCycle_maybe has been installed in a dark corner of GHC to catch some gremlins (a.k.a. occurs-check failures) who lurk there. But it previously only caught gremlins of the form (a ~ ... F a ...), where some of our intrepid users have spawned gremlins of the form (G a ~ ... F (G a) ...). This commit improves breakTyVarCycle_maybe (and renames it to breakTyEqCycle_maybe) to catch the new gremlins. Happily, the change is remarkably small. The gory details are in Note [Type equality cycles]. Test cases: typecheck/should_compile/{T21515,T21473}.
* Add tests for eta-expansion of data constructorssheaf2022-05-2610-0/+276
| | | | | This patch adds several tests relating to the eta-expansion of data constructors, including UnliftedNewtypes and DataTypeContexts.
* TTG: Move MatchGroup Origin field and MatchGroupTc to GHC.Hswip/romes/ttg-matchgroup-originromes2022-05-2611-87/+68
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* fix executablePath test for NetBSDFraser Tweedale2022-05-261-8/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | executablePath support for NetBSD was added in a172be07e3dce758a2325104a3a37fc8b1d20c9c, but the test was not updated. Update the test so that it works for NetBSD. This requires handling some quirks: - The result of getExecutablePath could include "./" segments. Therefore use System.FilePath.equalFilePath to compare paths. - The sysctl(2) call returns the original executable name even after it was deleted. Add `canQueryAfterDelete :: [FilePath]` and adjust expectations for the post-delete query accordingly. Also add a note to the `executablePath` haddock to advise that NetBSD behaves differently from other OSes when the file has been deleted. Also accept a decrease in memory usage for T16875. On Windows, the metric is -2.2% of baseline, just outside the allowed ±2%. I don't see how this commit could have influenced this metric, so I suppose it's something in the CI environment. Metric Decrease: T16875
* executablePath test: fix file extension treatmentFraser Tweedale2022-05-261-10/+11
| | | | | | | | | | | | | | | | The executablePath test strips the file extension (if any) when comparing the query result with the expected value. This is to handle platforms where GHC adds a file extension to the output program file (e.g. .exe on Windows). After the initial check, the file gets deleted (if supported). However, it tries to delete the *stripped* filename, which is incorrect. The test currently passes only because Windows does not allow deleting the program while any process created from it is alive. Make the test program correct in general by deleting the *non-stripped* executable filename.
* Desugar RecordUpd in `tcExpr`wip/T18802CarrieMY2022-05-2529-38/+306
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch typechecks record updates by desugaring them inside the typechecker using the HsExpansion mechanism, and then typechecking this desugared result. Example: data T p q = T1 { x :: Int, y :: Bool, z :: Char } | T2 { v :: Char } | T3 { x :: Int } | T4 { p :: Float, y :: Bool, x :: Int } | T5 The record update `e { x=e1, y=e2 }` desugars as follows e { x=e1, y=e2 } ===> let { x' = e1; y' = e2 } in case e of T1 _ _ z -> T1 x' y' z T4 p _ _ -> T4 p y' x' The desugared expression is put into an HsExpansion, and we typecheck that. The full details are given in Note [Record Updates] in GHC.Tc.Gen.Expr. Fixes #2595 #3632 #10808 #10856 #16501 #18311 #18802 #21158 #21289 Updates haddock submodule
* Fix haddock_*_perf tests on non-GNU-grep systemsGreg Steuck2022-05-241-4/+4
| | | | | | | Using regexp pattern requires `egrep` and straight up `+`. The haddock_parser_perf and haddock_renamer_perf tests now pass on OpenBSD. They previously incorrectly parsed the files and awk complained about invalid syntax.
* Add test for T21455Teo Camarasu2022-05-242-0/+6
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* EPA: Comment Order ReversedAlan Zimmerman2022-05-236-6/+259
| | | | | | | Make sure comments captured in the exact print annotations are in order of increasing location Closes #20718
* EPA : Remove duplicate comments in DataFamInstDAlan Zimmerman2022-05-234-10/+336
| | | | | | | | | | | | | | | | The code data instance Method PGMigration = MigrationQuery Query -- ^ Run a query against the database | MigrationCode (Connection -> IO (Either String ())) -- ^ Run any arbitrary IO code Resulted in two instances of the "-- ^ Run a query against the database" comment appearing in the Exact Print Annotations when it was parsed. Ensure only one is kept. Closes #20239
* Improve FloatOut and SpecConstrwip/T21386Simon Peyton Jones2022-05-233-10/+36
| | | | | | | | | | | | | | | | | | | | | | | This patch addresses a relatively obscure situation that arose when chasing perf regressions in !7847, which itself is fixing It does two things: * SpecConstr can specialise on ($df d1 d2) dictionary arguments * FloatOut no longer checks argument strictness See Note [Specialising on dictionaries] in GHC.Core.Opt.SpecConstr. A test case is difficult to construct, but it makes a big difference in nofib/real/eff/VSM, at least when we have the patch for #21286 installed. (The latter stops worker/wrapper for dictionary arguments). There is a spectacular, but slightly illusory, improvement in runtime perf on T15426. I have documented the specifics in T15426 itself. Metric Decrease: T15426
* Consider the stage of typeable evidence when checking stage restrictionMatthew Pickering2022-05-224-0/+30
| | | | | | | | | | | | | | We were considering all Typeable evidence to be "BuiltinInstance"s which meant the stage restriction was going unchecked. In-fact, typeable has evidence and so we need to apply the stage restriction. This is complicated by the fact we don't generate typeable evidence and the corresponding DFunIds until after typechecking is concluded so we introcue a new `InstanceWhat` constructor, BuiltinTypeableInstance which records whether the evidence is going to be local or not. Fixes #21547
* Change `Backend` type and remove direct dependencieswip/backend-as-recordNorman Ramsey2022-05-2114-15/+17
| | | | | | | | | | | | | | | | | | | With this change, `Backend` becomes an abstract type (there are no more exposed value constructors). Decisions that were formerly made by asking "is the current back end equal to (or different from) this named value constructor?" are now made by interrogating the back end about its properties, which are functions exported by `GHC.Driver.Backend`. There is a description of how to migrate code using `Backend` in the user guide. Clients using the GHC API can find a backdoor to access the Backend datatype in GHC.Driver.Backend.Internal. Bumps haddock submodule. Fixes #20927
* Remove pprTrace from pushCoercionIntoLambda (#21555)Matthew Pickering2022-05-202-0/+99
| | | | | | | | | | | | | This firstly caused spurious output to be emitted (as evidenced by #21555) but even worse caused a massive coercion to be attempted to be printed (> 200k terms) which would invariably eats up all the memory of your computer. The good news is that removing this trace allows the program to compile to completion, the bad news is that the program exhibits a core lint error (on 9.0.2) but not any other releases it seems. Fixes #21577 and #21555
* base: Throw exceptions raised while closing finalized HandlesBen Gamari2022-05-191-8/+10
| | | | Fixes #21336.
* Don't store LlvmConfig into DynFlagsSylvain Henry2022-05-175-26/+33
| | | | | | | | | | | | | | | | | | | | | LlvmConfig contains information read from llvm-passes and llvm-targets files in GHC's top directory. Reading these files is done only when needed (i.e. when the LLVM backend is used) and cached for the whole compiler session. This patch changes the way this is done: - Split LlvmConfig into LlvmConfig and LlvmConfigCache - Store LlvmConfigCache in HscEnv instead of DynFlags: there is no good reason to store it in DynFlags. As it is fixed per session, we store it in the session state instead (HscEnv). - Initializing LlvmConfigCache required some changes to driver functions such as newHscEnv. I've used the opportunity to untangle initHscEnv from initGhcMonad (in top-level GHC module) and to move it to GHC.Driver.Main, close to newHscEnv. - I've also made `cmmPipeline` independent of HscEnv in order to remove the call to newHscEnv in regalloc_unit_tests.
* Add test for #21558Matthew Pickering2022-05-172-0/+17
| | | | | | This is now fixed on master and 9.2 branch. Closes #21558
* Remove unused test files (#21582)Vladislav Zavialov2022-05-174-751/+0
| | | | | Those files were moved to the perf/ subtree in 11c9a469, and then accidentally reintroduced in 680ef2c8.
* Fix bad interaction between withDict and the SpecialiserSimon Peyton Jones2022-05-173-0/+109
| | | | | | | | | | | | This MR fixes a bad bug, where the withDict was inlined too vigorously, which in turn made the type-class Specialiser generate a bogus specialisation, because it saw the same overloaded function applied to two /different/ dictionaries. Solution: inline `withDict` later. See (WD8) of Note [withDict] in GHC.HsToCore.Expr See #21575, which is fixed by this change.
* OverloadedRecordFields: mention parent name in 'ambiguous occurrence' error ↵nineonine2022-05-1719-74/+115
| | | | for better disambiguation (#17420)
* testsuite: Add tests for system-cxx-std-lib packageBen Gamari2022-05-177-0/+43
| | | | | | | Test that we can successfully link against C++ code both in GHCi and batch compilation. See #20010
* testsuite: Build T20918 with HC, not CXXBen Gamari2022-05-171-2/+2
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* TcPlugin: access to irreducible givens + fix passed ev_binds_varPavol Vargovcik2022-05-166-0/+116
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* Add arity to the INLINE pragmas for pattern synonymsSimon Peyton Jones2022-05-163-0/+137
| | | | | The lack of INLNE arity was exposed by #21531. The fix is simple enough, if a bit clumsy.
* testsuite: Add tests for #21556Ben Gamari2022-05-137-0/+33
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* rts/PEi386: Fix handling of weak symbolsBen Gamari2022-05-131-2/+0
| | | | | | | | Previously we would flag the symbol as weak but failed to set its address, which must be computed from an "auxiliary" symbol entry the follows the weak symbol. Fixes #21556.
* Fix printing of brackets in multiplicities (#20315)jackohughes2022-05-133-0/+11
| | | | | | | | | Change mulArrow to allow for printing of correct application precedence where necessary and update callers of mulArrow to reflect this. As part of this, move mulArrow from GHC/Utils/Outputtable to GHC/Iface/Type. Fixes #20315
* Remove Module argument from initCmmParserConfigAndre Marianiello2022-05-121-2/+1
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* Decouple dynflags in Cmm parser (related to #17957)Andre Marianiello2022-05-121-1/+5
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* Add a missing guard in GHC.HsToCore.Utils.is_flat_prod_patSimon Peyton Jones2022-05-113-0/+35
| | | | This missing guard gave rise to #21519.
* EPA: do statement with leading semicolon has wrong anchorAlan Zimmerman2022-05-113-0/+11
| | | | | | | | | | | | | The code do; a <- doAsync; b Generated an incorrect Anchor for the statement list that starts after the first semicolon. This commit fixes it. Closes #20256
* Make floating-point abs IEEE 754 compliantARATA Mizuki2022-05-111-3/+1
| | | | | | The old code used by via-C backend didn't handle the sign bit of NaN. See #21043.
* Use the wrapper for an unlifted bindingSimon Peyton Jones2022-05-102-0/+9
| | | | | | | We assumed the wrapper for an unlifted binding is the identity, but as #21516 showed, that is no always true. Solution is simple: use it.
* Check for uninferrable variables in tcInferPatSynDeclSimon Peyton Jones2022-05-108-5/+24
| | | | | | | | | | This fixes #21479 See Note [Unquantified tyvars in a pattern synonym] While doing this, I found that some error messages pointed at the pattern synonym /name/, rather than the /declaration/ so I widened the SrcSpan to encompass the declaration.
* driver: Make -no-keep-o-files -no-keep-hi-files work in --make modeMatthew Pickering2022-05-105-2/+24
| | | | | | | | | | | | It seems like it was just an oversight to use the incorrect DynFlags (global rather than local) when implementing these two options. Using the local flags allows users to request these intermediate files get cleaned up, which works fine in --make mode because 1. Interface files are stored in memory 2. Object files are only cleaned at the end of session (after link) Fixes #21349
* STG: only print cost-center if asked toSylvain Henry2022-05-093-7/+8
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* add test case for #21446Teo Camarasu2022-05-093-0/+12
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* template-haskell: Fix representation of OPAQUE pragmasMatthew Pickering2022-05-062-0/+11
| | | | | | | | | | There is a mis-match between the TH representation of OPAQUE pragmas and GHC's internal representation due to how OPAQUE pragmas disallow phase annotations. It seemed most in keeping to just fix the wired in name issue by adding a special case to the desugaring of INLINE pragmas rather than making TH/GHC agree with how the representation should look. Fixes #21463
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