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* Move `/includes` to `/rts/include`, sort per package betterJohn Ericson2021-08-092-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | In order to make the packages in this repo "reinstallable", we need to associate source code with a specific packages. Having a top level `/includes` dir that mixes concerns (which packages' includes?) gets in the way of this. To start, I have moved everything to `rts/`, which is mostly correct. There are a few things however that really don't belong in the rts (like the generated constants haskell type, `CodeGen.Platform.h`). Those needed to be manually adjusted. Things of note: - No symlinking for sake of windows, so we hard-link at configure time. - `CodeGen.Platform.h` no longer as `.hs` extension (in addition to being moved to `compiler/`) so as not to confuse anyone, since it is next to Haskell files. - Blanket `-Iincludes` is gone in both build systems, include paths now more strictly respect per-package dependencies. - `deriveConstants` has been taught to not require a `--target-os` flag when generating the platform-agnostic Haskell type. Make takes advantage of this, but Hadrian has yet to.
* Remove ad-hoc fromIntegral rulesSylvain Henry2021-08-092-0/+1009
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | fromIntegral is defined as: {-# NOINLINE [1] fromIntegral #-} fromIntegral :: (Integral a, Num b) => a -> b fromIntegral = fromInteger . toInteger Before this patch, we had a lot of rewrite rules for fromIntegral, to avoid passing through Integer when there is a faster way, e.g.: "fromIntegral/Int->Word" fromIntegral = \(I# x#) -> W# (int2Word# x#) "fromIntegral/Word->Int" fromIntegral = \(W# x#) -> I# (word2Int# x#) "fromIntegral/Word->Word" fromIntegral = id :: Word -> Word Since we have added sized types and primops (Word8#, Int16#, etc.) and Natural, this approach didn't really scale as there is a combinatorial explosion of types. In addition, we really want these conversions to be optimized for all these types and in every case (not only when fromIntegral is explicitly used). This patch removes all those ad-hoc fromIntegral rules. Instead we rely on inlining and built-in constant-folding rules. There are not too many native conversions between Integer/Natural and fixed size types, so we can handle them all explicitly. Foreign.C.Types was using rules to ensure that fromIntegral rules "sees" through the newtype wrappers,e.g.: {-# RULES "fromIntegral/a->CSize" fromIntegral = \x -> CSize (fromIntegral x) "fromIntegral/CSize->a" fromIntegral = \(CSize x) -> fromIntegral x #-} But they aren't necessary because coercions due to newtype deriving are pushed out of the way. So this patch removes these rules (as fromIntegral is now inlined, they won't match anymore anyway). Summary: * INLINE `fromIntegral` * Add some missing constant-folding rules * Remove every fromIntegral ad-hoc rules (fix #19907) Fix #20062 (missing fromIntegral rules for sized primitives) Performance: - T12545 wiggles (tracked by #19414) Metric Decrease: T12545 T10359 Metric Increase: T12545
* testsuite: Add test for #20199Ben Gamari2021-08-094-0/+17
| | | | Ensures that Rts.h can be parsed as C++.
* Minor fix to pretty-printing of linear typesKrzysztof Gogolewski2021-08-053-0/+19
| | | | | | The function ppr_arrow_chain was not printing multiplicities. Also remove the Outputable instance: no longer used, and could cover bugs like those.
* Use Reductions to keep track of rewritingssheaf2021-08-042-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | We define Reduction = Reduction Coercion !Type. A reduction of the form 'Reduction co new_ty' witnesses an equality ty ~co~> new_ty. That is, the rewriting happens left-to-right: the right-hand-side type of the coercion is the rewritten type, and the left-hand-side type the original type. Sticking to this convention makes the codebase more consistent, helping to avoid certain applications of SymCo. This replaces the parts of the codebase which represented reductions as pairs, (Coercion,Type) or (Type,Coercion). Reduction being strict in the Type argument improves performance in some programs that rewrite many type families (such as T9872). Fixes #20161 ------------------------- Metric Decrease: T5321Fun T9872a T9872b T9872c T9872d -------------------------
* Fix GHCi completion (#20101)Zubin Duggal2021-08-045-4/+18
| | | | Updates haskeline submodule
* Linear types: fix linting of multiplicities (#19165)Krzysztof Gogolewski2021-08-041-1/+1
| | | | The previous version did not substitute the type used in the scrutinee.
* Disable -fdefer-type-errors for linear types (#20083)Krzysztof Gogolewski2021-08-044-2/+30
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* Correctly unload libs on GHCi with external iservTito Sacchi2021-08-031-2/+1
| | | | | | | | | Fix #17669 `hostIsDynamic` is basically a compile-time constant embedded in the RTS. Therefore, GHCi didn't unload object files properly when used with an external interpreter built in a different way.
* Handle OverloadedRecordDot in TH (#20185)Zubin Duggal2021-08-034-0/+48
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* Remove eager forcing of RuleInfo in substRuleInfoMatthew Pickering2021-08-033-0/+48
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | substRuleInfo updates the IdInfo for an Id, therefore it is important to not force said IdInfo whilst updating it, otherwise we end up in an infinite loop. This is what happened in #20112 where `mkTick` forced the IdInfo being updated by checking the arity in isSaturatedConApp. The fix is to stop the expression being forced so early by removing the call to seqRuleInfo. The call sequence looked something like: * `substRecBndrs` * `substIdBndr` * `substIdInfo` * `substRuleInfo` * `substRule` * `substExpr` * `mkTick` * `isSaturatedConApp` * Look at `IdInfo` for thing we are currently substituting because the rule is attached to `transpose` and mentions it in the `RHS` of the rule. Which arose because the `transpose` Id had a rule attached where the RHS of the rule also mentioned `transpose`. This call to seqRuleInfo was introduced in 4e7d56fde0f44d38bbb9a6fc72cf9c603264899d where it was explained > I think there are now *too many* seqs, and they waste work, but I don't have > time to find which ones. We also observe that there is the ominous note on `substRule` about making sure substExpr is called lazily. > {- Note [Substitute lazily] > ~~~~~~~~~~~~~~~~~~~~~~~~~~~ > The functions that substitute over IdInfo must be pretty lazy, because > they are knot-tied by substRecBndrs. > > One case in point was #10627 in which a rule for a function 'f' > referred to 'f' (at a different type) on the RHS. But instead of just > substituting in the rhs of the rule, we were calling simpleOptExpr, which > looked at the idInfo for 'f'; result <<loop>>. > > In any case we don't need to optimise the RHS of rules, or unfoldings, > because the simplifier will do that. Before `seqRuleInfo` was removed, this note was pretty much ignored in the `substSpec` case because the expression was immediately forced after `substRule` was called. Unfortunately it's a bit tricky to add a test for this as the failure only manifested (for an unknown reason) with a dwarf enabled compiler *AND* compiling with -g3. Fortunatley there is currently a CI configuration which builds a dwarf compiler to test this. Also, for good measure, finish off the work started in 840df33685e8c746ade4b9d4d0eb7c764a773e48 which renamed SpecInfo to RuleInfo but then didn't rename 'substSpec' to 'substRuleInfo'. Fixes #20112
* Catch type-checker exceptions when splicingSimon Peyton Jones2021-08-023-0/+18
| | | | | | | | In GHC.Tc.Gen.Splice.tcTopSpliceExpr we were forgetting to catch exceptions. As a result we missed the kind error in the unsolved constraints. This patch has an easy fix, which cures #20179
* Supply missing case for '.' inShayne Fletcher2021-08-023-3/+9
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* Disallow nonlinear fields in Template Haskell (#18378)Krzysztof Gogolewski2021-08-027-0/+29
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* Lookup string literals in top-level thunks (fix #16373)Sylvain Henry2021-08-023-0/+27
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* Constant-fold unpackAppendCString (fix #20174)Sylvain Henry2021-08-023-0/+38
| | | | | | | Minor renaming: since 1ed0409010afeaa318676e351b833aea659bf93a rules get an InScopeEnv arg (containing an IdUnfoldingFun) instead of an IdUnfoldingFun directly, hence I've renamed the parameter from "id_unf" to "env" for clarity.
* testsuite: Add test for #20137Ben Gamari2021-08-025-0/+118
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* Add Generically (generic Semigroup, Monoid instances) and Generically1 ↵Baldur Blöndal2021-08-024-0/+24
| | | | (generic Functor, Applicative, Alternative, Eq1, Ord1 instances) to GHC.Generics.
* PrimOps: Add CAS op for all int sizesPeter Trommler2021-08-022-0/+250
| | | | | | | | | | | PPC NCG: Implement CAS inline for 32 and 64 bit testsuite: Add tests for smaller atomic CAS X86 NCG: Catch calls to CAS C fallback Primops: Add atomicCasWord[8|16|32|64]Addr# Add tests for atomicCasWord[8|16|32|64]Addr# Add changelog entry for new primops X86 NCG: Fix MO-Cmpxchg W64 on 32-bit arch ghc-prim: 64-bit CAS C fallback on all archs
* ghc: Introduce --run modeBen Gamari2021-08-024-0/+13
| | | | | | As described in #18011, this mode provides similar functionality to the `runhaskell` command, but doesn't require that the user know the path of yet another executable, simplifying interactions with upstream tools.
* Reject pattern synonyms with linear types (#18806)Krzysztof Gogolewski2021-07-295-2/+13
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* Add test for #18567Matthew Pickering2021-07-298-0/+68
| | | | Closes #18567
* compiler: Name generated locals more descriptivelyBen Gamari2021-07-293-8/+11
| | | | | | Previously `GHC.Types.Id.Make.newLocal` would name all locals `dt`, making it unnecessarily difficult to determine their origin. Noticed while looking at #19557.
* Port more DriverUnknownMessage into richer DriverMessage constructorsAlfredo Di Napoli2021-07-287-15/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In order: * Introduce the `PsErrUnknownOptionsPragma` diagnostic message This commit changes the diagnostic emitted inside `GHC.Parser.Header.checkProcessArgsResult` from an (erroneous) and unstructured `DriverUnknownMessage` to a `PsErrUnknownOPtionsPragma`, i.e. a new data constructor of a `PsHeaderMessage`. * Add the `DriverUserDefinedRuleIgnored` diagnostic message * Add `DriverUserDefinedRuleIgnored` data constructor This commit adds (and use) a new data constructor to the `DriverMessage` type, replacing a `DriverUnknownMessage` with it. * Add and use `DriverCannotLoadInterfaceFile` constructor This commit introduces the DriverCannotLoadInterfaceFile constructor for the `DriverMessage` type and it uses it to replace and occurrence of `DriverUnknownMessage`. * Add and use the `DriverInferredSafeImport` constructor This commit adds a new `DriverInferredSafeImport` constructor to the `DriverMessage` type, and uses it in `GHC.Driver.Main` to replace one occurrence of `DriverUnknownMessage`. * Add and use `DriverCannotImportUnsafeModule` constructor This commit adds the `DriverCannotImportUnsafeModule` constructor to the `DriverMessage` type, and later using it to replace one usage of `DriverUnknownMessage` in the `GHC.Driver.Main` module. * Add and use `DriverMissingSafeHaskellMode` constructor * Add and use `DriverPackageNotTrusted` constructor * Introduce and use `DriverInferredSafeModule` constructor * Add and use `DriverMarkedTrustworthyButInferredSafe` constructor * Add and use `DriverCannotImportFromUntrustedPackage`
* Update expected stderr for affected tests, which are not under Tc directoryCarrieMY2021-07-282-4/+4
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* Fix type check error message grammar (fixes #20122)CarrieMY2021-07-288-52/+78
| | | | Remove trailing spaces
* Add a regression test for #17697Krzysztof Gogolewski2021-07-273-0/+15
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* Parser: suggest TemplateHaskell on $$(...) (#20157)Krzysztof Gogolewski2021-07-275-0/+22
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* Eliminate unnecessary unsafeEqualityProofSimon Peyton Jones2021-07-272-0/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch addresses #20143, which wants to discard unused calls to unsafeEqualityProof. There are two parts: * In exprOkForSideEffects, we want to know that unsafeEqualityProof indeed terminates, without any exceptions etc * But we can only discard the case if we know that the coercion variable is not used, which means we have to gather accurate occurrence info for CoVars. Previously OccurAnal only did a half hearted job of doing so; this patch finishes the job. See Note [Gather occurrences of coercion variables] in OccurAnal. Because the occurrence analyser does more work, there is a small compile-time cost but it's pretty small. The compiler perf tests are usually 0.0% but occasionally up to 0.3% increase. I'm just going to accept this -- gathering accurate occurrence information really seems like the Right Thing to do. There is an increase in `compile_time/peak_megabytes_allocated`, for T11545, or around 14%; but I can't reproduce it on my machine (it's the same before and after), and the peak-usage stats are vulnerable to when exactly the GC takes place, so I'm just going to accept it. Metric Increase: T11545
* Eta expand through CallStacksSimon Peyton Jones2021-07-273-0/+162
| | | | | | | This patch fixes #20103, by treating HasCallStack constraints as cheap when eta-expanding. See Note [Eta expanding through CallStacks] in GHC.Core.Opt.Arity
* Make CallStacks work better with RebindableSyntaxSimon Peyton Jones2021-07-276-0/+111
| | | | | | | | | | | | | | | | | | | | As #19918 pointed out, the CallStack mechanism didn't work well with RebindableSyntax. This patch improves matters. See GHC.Tc.Types.Evidence Note [Overview of implicit CallStacks] * New predicate isPushCallStackOrigin distinguishes when a CallStack constraint should be solved "directly" or by pushing an item on the stack. * The constructor EvCsPushCall now has a FastString, which can describe not only a function call site, but also things like "the literal 42" or "an if-then-else expression". * I also fixed #20126 thus: exprCtOrigin (HsIf {}) = IfThenElseOrigin (Previously it was "can't happen".)
* testsuite: Add more debug output on failure to call ghc-pkgMatthew Pickering2021-07-271-1/+1
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* packaging: Create both versioned and unversioned executablesMatthew Pickering2021-07-271-0/+6
| | | | | | | | | Before we would just copy the unversioned executable into the bindist. Now the actual executable is copied into the bindist and a version suffix is added. Then a wrapper or symlink is added which points to the versioned executable. Fixes #20074
* rts: Introduce and use ExecPage abstractionBen Gamari2021-07-272-5/+5
| | | | | Here we introduce a very thin abstraction for allocating, filling, and freezing executable pages to replace allocateExec.
* testsuite: Add test for #20142Ben Gamari2021-07-232-0/+31
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* Introduce FinderLocations for decoupling Finder from DynFlagsFendor2021-07-232-2/+4
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* Add test for #13157Matthew Pickering2021-07-233-0/+16
| | | | Closes #13157
* Generalise reallyUnsafePtrEquality# and use itsheaf2021-07-238-0/+84
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | fixes #9192 and #17126 updates containers submodule 1. Changes the type of the primop `reallyUnsafePtrEquality#` to the most general version possible (heterogeneous as well as levity-polymorphic): > reallyUnsafePtrEquality# > :: forall {l :: Levity} {k :: Levity} > (a :: TYPE (BoxedRep l)) (b :: TYPE (BoxedRep k)) > . a -> b -> Int# 2. Adds a new internal module, `GHC.Ext.PtrEq`, which contains pointer equality operations that are now subsumed by `reallyUnsafePtrEquality#`. These functions are then re-exported by `GHC.Exts` (so that no function goes missing from the export list of `GHC.Exts`, which is user-facing). More specifically, `GHC.Ext.PtrEq` defines: - A new function: * reallyUnsafePtrEquality :: forall (a :: Type). a -> a -> Int# - Library definitions of ex-primops: * `sameMutableArray#` * `sameSmallMutableArray` * `sameMutableByteArray#` * `sameMutableArrayArray#` * `sameMutVar#` * `sameTVar#` * `sameMVar#` * `sameIOPort#` * `eqStableName#` - New functions for comparing non-mutable arrays: * `sameArray#` * `sameSmallArray#` * `sameByteArray#` * `sameArrayArray#` These were requested in #9192. Generally speaking, existing libraries that use `reallyUnsafePtrEquality#` will continue to work with the new, levity-polymorphic version. But not all! Some (`containers`, `unordered-containers`, `dependent-map`) contain the following: > unsafeCoerce# reallyUnsafePtrEquality# a b If we make `reallyUnsafePtrEquality#` levity-polymorphic, this code fails the current GHC representation-polymorphism checks. We agreed that the right solution here is to modify the library; in this case by deleting the call to `unsafeCoerce#`, since `reallyUnsafePtrEquality#` is now type-heterogeneous too.
* Add nontrivial type-checking plugin testssheaf2021-07-2312-0/+454
| | | | | | | | | | | | | Three new tests for type-checking plugins: - TcPlugin_Nullary, solving a nullary class constraint - TcPlugin_Args, providing evidence for a (unary) class constraint using arguments supplied to the plugin - TcPlugin_TyFam, solving an equality constraint to rewrite a type-family application More extensive descriptions of the plugins can be found in their respective defining modules.
* Fix #19931John Ericson2021-07-213-0/+37
| | | | | | | | | | | | | | | | | | | | | | | | | The issue was the renderer for x86 addressing modes assumes native size registers, but we were passing in a possibly-smaller index in conjunction with a native-sized base pointer. The easist thing to do is just extend the register first. I also changed the other NGC backends implementing jump tables accordingly. On one hand, I think PowerPC and Sparc don't have the small sub-registers anyways so there is less to worry about. On the other hand, to the extent that's true the zero extension can become a no-op. I should give credit where it's due: @hsyl20 really did all the work for me in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/4717#note_355874, but I was daft and missed the "Oops" and so ended up spending a silly amount of time putting it all back together myself. The unregisterised backend change is a bit different, because here we are translating the actual case not a jump table, and the fix is to handle right-sized literals not addressing modes. But it makes sense to include here too because it's the same change in the subsequent commit that exposes both bugs.
* template-haskell: Add support for default declarationsMario Blažević2021-07-213-0/+18
| | | | Fixes #19373
* Refactor SuggestExtension constructor in GhcHintAlfredo Di Napoli2021-07-2110-25/+36
| | | | | | | | | | | | | | | | | | This commit refactors the SuggestExtension type constructor of the GhcHint to be more powerful and flexible. In particular, we can now embed extra user information (essentially "sugar") to help clarifying the suggestion. This makes the following possible: Suggested fix: Perhaps you intended to use GADTs or a similar language extension to enable syntax: data T where We can still give to IDEs and tools a `LangExt.Extension` they can use, but in the pretty-printed message we can tell the user a bit more on why such extension is needed. On top of that, we now have the ability to express conjuctions and disjunctons, for those cases where GHC suggests to enable "X or Y" and for the cases where we need "X and Y".
* driver: Fix recompilation for modules importing GHC.PrimMatthew Pickering2021-07-214-0/+12
| | | | | | | | | | | | | The GHC.Prim module is quite special as there is no interface file, therefore it doesn't appear in ms_textual_imports, but the ghc-prim package does appear in the direct package dependencies. This confused the recompilation checking which couldn't find any modules from ghc-prim and concluded that the package was no longer a dependency. The fix is to keep track of whether GHC.Prim is imported separately in the relevant places. Fixes #20084
* Don't duplicate constructors in the simplifierSimon Peyton Jones2021-07-193-1/+157
| | | | | | | | | | | | Ticket #20125 showed that the Simplifier could sometimes duplicate a constructor binding. CSE would often eliminate it later, but doing it in the first place was utterly wrong. See Note [Do not duplicate constructor applications] in Simplify.hs I also added a short-cut to Simplify.simplNonRecX for the case when the RHS is trivial. I don't think this will change anything, just make the compiler run a tiny bit faster.
* th: Weaken return type of myCoreToStgExprMatthew Pickering2021-07-192-0/+12
| | | | | | | | | | | | | | | | | | | | The previous code assumed properties of the CoreToStg translation, namely that a core let expression which be translated to a single non-recursive top-level STG binding. This assumption was false, as evidenced by #20060. The consequence of this was the need to modify the call sites of `myCoreToStgExpr`, the main one being in hscCompileCoreExpr', which the meant we had to use byteCodeGen instead of stgExprToBCOs to convert the returned value to bytecode. I removed the `stgExprToBCOs` function as it is no longer used in the compiler. There is still some partiallity with this patch (the lookup in hscCompileCoreExpr') but this should be more robust that before. Fixes #20060
* Better sharing of join points (#19996)wip/T19557Simon Peyton Jones2021-07-192-0/+57
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch, provoked by regressions in the text package (#19557), improves sharing of join points. This also fixes the terrible behaviour in #20049. See Note [Duplicating join points] in GHC.Core.Opt.Simplify. * In the StrictArg case of mkDupableContWithDmds, don't use Plan A for data constructors * In postInlineUnconditionally, don't inline JoinIds Avoids inlining join $j x = Just x in case blah of A -> $j x1 B -> $j x2 C -> $j x3 * In mkDupableStrictBind and mkDupableStrictAlt, create join points (much) more often: exprIsTrivial rather than exprIsDupable. This may be much, but we'll see. Metric Decrease: T12545 T13253-spj T13719 T18140 T18282 T18304 T18698a T18698b Metric Increase: T16577 T18923 T9961
* Don't panic on 'no skolem info' and add failing testswip/no-skolem-panicZubin Duggal2021-07-139-0/+94
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* driver: Fix interaction of -Wunused-packages and reexported-modulesMatthew Pickering2021-07-1316-0/+106
| | | | | | | | | | | | | | Spurious warnings were previously emitted if an import came from a reexport due to how -Wunused-packages were implemented. Removing the dependency would cause compilation to fail. The fix is to reimplement the warning a bit more directly, by searching for which package each import comes from using the normal module finding functions rather than consulting the EPS. This has the advantage that the check could be performed at any time after downsweep rather than also relying on a populated EPS. Fixes #19518 and #19777
* Add proper GHCHints for most PsMessage constructorswip/adinapoli-issue-20055Alfredo Di Napoli2021-07-1233-53/+86
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This commit adds proper hints to most diagnostic types in the `GHC.Parser.Errors.Types` module. By "proper" we mean that previous to this commit the hints were bundled together with the diagnostic message, whereas now we moved most of them as proper `[GhcHint]` in the implementation of `diagnosticHints`. More specifically, this is the list of constructors which now has proper hints: * PsErrIllegalBangPattern * PsWarnOperatorWhitespaceExtConflict * PsErrLambdaCase * PsErrIllegalPatSynExport * PsWarnOperatorWhitespace * PsErrMultiWayIf * PsErrIllegalQualifiedDo * PsErrNumUnderscores * PsErrLinearFunction * PsErrIllegalTraditionalRecordSyntax * PsErrIllegalExplicitNamespace * PsErrOverloadedRecordUpdateNotEnabled * PsErrIllegalDataTypeContext * PsErrSemiColonsInCondExpr * PsErrSemiColonsInCondCmd * PsWarnStarIsType * PsWarnImportPreQualified * PsErrImportPostQualified * PsErrEmptyDoubleQuotes * PsErrIllegalRoleName * PsWarnStarBinder For some reason, this patch increases the peak_megabyte_allocated of the T11545 test to 90 (from a baseline of 80) but that particular test doesn't emit any parsing diagnostic or hint and the metric increase happens only for the `aarch64-linux-deb10`. Metric Increase: T11545
* Don't return unitExpr in dsWhenNoErrssheaf2021-07-104-0/+30
| | | | | | | | | | | | | - fixes #18149 and #14765 dsWhenNoErrs now returns "runtimeError @ty" when disallowed representation polymorphism is detected, where ty is the type of the result CoreExpr. "ty" is passed as an additional argument to dsWhenNoErrs, and is used only in the case of such an error. The calls to dsWhenNoErrs must now compute the type of the CoreExpr they are trying to build, so that an error of the right type can be used in case of a representation polymorphism failure.
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