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* ghc-prim: Generalize keepAlive#/touch# in state token typeBen Gamari2023-05-101-2/+2
| | | | Closes #23163.
* Adjust AArch64 stackFrameHeaderSizeSven Tennie2023-05-091-7/+6
| | | | | The prologue of each stack frame are the saved LR and FP registers, 8 byte each. I.e. the size of the stack frame header is 2 * 8 byte.
* JS: add GHC.JS.Optimizer, remove RTS.Printer, add Linker.Optdoyougnu2023-05-0914-386/+664
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This MR changes some simple optimizations and is a first step in re-architecting the JS backend pipeline to add the optimizer. In particular it: - removes simple peep hole optimizations from `GHC.StgToJS.Printer` and removes that module - adds module `GHC.JS.Optimizer` - defines the same peep hole opts that were removed only now they are `Syntax -> Syntax` transformations rather than `Syntax -> JS code` optimizations - hooks the optimizer into code gen - adds FuncStat and ForStat constructors to the backend. Working Ticket: - #22736 Related MRs: - MR !10142 - MR !10000 ------------------------- Metric Decrease: CoOpt_Read ManyAlternatives PmSeriesS PmSeriesT PmSeriesV T10421 T12707 T13253 T13253-spj T15164 T17516 T18140 T18282 T18698a T18698b T18923 T1969 T19695 T20049 T3064 T5321FD T5321Fun T783 T9198 T9233 T9630 -------------------------
* Make atomicSwapMutVar# an inline primopwip/ioref-swap-xchgBen Gamari2023-05-092-11/+20
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* compiler: Implement atomicSwapIORef with xchgBen Gamari2023-05-093-0/+10
| | | | As requested by @treeowl in CLC#139.
* Add structured error messages for GHC.IfaceToCoreTorsten Schmits2023-05-084-6/+10
| | | | | | | | | Tracking ticket: #20114 MR: !10390 This converts uses of `mkTcRnUnknownMessage` to newly added constructors of `TcRnMessage`.
* Add structured error messages for GHC.Rename.ModuleTorsten Schmits2023-05-057-62/+181
| | | | | | | | | | | Tracking ticket: #20115 MR: !10361 This converts uses of `mkTcRnUnknownMessage` to newly added constructors of `TcRnMessage`. Only addresses the single warning missing from the previous MR.
* docs: Add Note [Timing of plugin initialization]Matthew Pickering2023-05-053-0/+25
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* Rework plugin initialisation pointsAaron Allen2023-05-054-14/+25
| | | | | | | | | | | | | | | | | | In general this patch pushes plugin initialisation points to earlier in the pipeline. As plugins can modify the `HscEnv`, it's imperative that the plugins are initialised as soon as possible and used thereafter. For example, there are some new tests which modify hsc_logger and other hooks which failed to fire before (and now do) One consequence of this change is that the error for specifying the usage of a HPT plugin from the command line has changed, because it's now attempted to be loaded at initialisation rather than causing a cyclic module import. Closes #21279 Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>
* driver: Use hooks from plugin_hsc_envMatthew Pickering2023-05-051-1/+1
| | | | | | This fixes a bug in oneshot mode where hooks modified in a plugin wouldn't be used in oneshot mode because we neglected to use the right hsc_env. This was observed by @csabahruska.
* Add structured error messages for GHC.Rename.UtilsTorsten Schmits2023-05-0511-190/+421
| | | | | | | | | Tracking ticket: #20115 MR: !10350 This converts uses of `mkTcRnUnknownMessage` to newly added constructors of `TcRnMessage`.
* Fix type variable substitution in gen_Newtype_fam_instsRyan Scott2023-05-042-9/+69
| | | | | | | | | | | | | Previously, `gen_Newtype_fam_insts` was substituting the type variable binders of a type family instance using `substTyVars`, which failed to take type variable dependencies into account. There is similar code in `GHC.Tc.TyCl.Class.tcATDefault` that _does_ perform this substitution properly, so this patch: 1. Factors out this code into a top-level `substATBndrs` function, and 2. Uses `substATBndrs` in `gen_Newtype_fam_insts`. Fixes #23329.
* linear types: Don't add external names to the usage envKrzysztof Gogolewski2023-05-043-6/+12
| | | | This has no observable effect, but avoids storing useless data.
* JavaScript: Correct arguments to h$appendToHsStringALuite Stegeman2023-05-041-1/+1
| | | | fixes #23278
* Fix remaining issues with bound checking (#23123)Sylvain Henry2023-05-042-505/+527
| | | | | | | | | | | | | | | | | | | | While fixing these I've also changed the way we store addresses into ByteArray#. Addr# are composed of two parts: a JavaScript array and an offset (32-bit number). Suppose we want to store an Addr# in a ByteArray# foo at offset i. Before this patch, we were storing both fields as a tuple in the "arr" array field: foo.arr[i] = [addr_arr, addr_offset]; Now we only store the array part in the "arr" field and the offset directly in the array: foo.dv.setInt32(i, addr_offset): foo.arr[i] = addr_arr; It avoids wasting space for the tuple.
* JS: fix bounds checking (Issue 23123)Josh Meredith2023-05-041-110/+170
| | | | | | | | | | | | | | | | | | | | * For ByteArray-based bounds-checking, the JavaScript backend must use the `len` field, instead of the inbuild JavaScript `length` field. * Range-based operations must also check both the start and end of the range for bounds * All indicies are valid for ranges of size zero, since they are essentially no-ops * For cases of ByteArray accesses (e.g. read as Int), the end index is (i * sizeof(type) + sizeof(type) - 1), while the previous implementation uses (i + sizeof(type) - 1). In the Int32 example, this is (i * 4 + 3) * IndexByteArrayOp_Word8As* primitives use byte array indicies (unlike the previous point), but now check both start and end indicies * Byte array copies now check if the arrays are the same by identity and then if the ranges overlap.
* Validate compatibility of ghcs when loading pluginsromes2023-05-041-6/+13
| | | | | | | Ensure, when loading plugins, that the ghc the plugin depends on is the ghc loading the plugin -- otherwise fail to load the plugin. Progress towards #20742.
* Hardwire a better unit-id for ghcromes2023-05-042-2/+45
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Previously, the unit-id of ghc-the-library was fixed as `ghc`. This was done primarily because the compiler must know the unit-id of some packages (including ghc) a-priori to define wired-in names. However, as seen in #20742, a reinstallable `ghc` whose unit-id is fixed to `ghc` might result in subtle bugs when different ghc's interact. A good example of this is having GHC_A load a plugin compiled by GHC_B, where GHC_A and GHC_B are linked to ghc-libraries that are ABI incompatible. Without a distinction between the unit-id of the ghc library GHC_A is linked against and the ghc library the plugin it is loading was compiled against, we can't check compatibility. This patch gives a slightly better unit-id to ghc (ghc-version) by (1) Not setting -this-unit-id to ghc, but rather to the new unit-id (modulo stage0) (2) Adding a definition to `GHC.Settings.Config` whose value is the new unit-id. (2.1) `GHC.Settings.Config` is generated by Hadrian (2.2) and also by cabal through `compiler/Setup.hs` This unit-id definition is imported by `GHC.Unit.Types` and used to set the wired-in unit-id of "ghc", which was previously fixed to "ghc" The commits following this one will improve the unit-id with a cabal-style package hash and check compatibility when loading plugins. Note that we also ensure that ghc's unit key matches unit id both when hadrian or cabal builds ghc, and in this way we no longer need to add `ghc` to the WiringMap.
* Don't forget to check the parent in an export listsheaf2023-05-031-26/+23
| | | | | | | | Commit 3f374399 introduced a bug which caused us to forget to include the parent of an export item of the form T(..) (that is, IEThingAll) when checking for duplicate exports. Fixes #23318
* Add sized primitive literal syntaxBen Orchard2023-05-036-73/+308
| | | | | | | | | | | | | | Adds a new LANGUAGE pragma ExtendedLiterals, which enables defining unboxed numeric literals such as `0xFF#Word8 :: Word8#`. Implements GHC proposal 0451: https://github.com/ghc-proposals/ghc-proposals/blob/b384a538b34f79d18a0201455b7b3c473bc8c936/proposals/0451-sized-literals.rst Fixes #21422. Bumps haddock submodule. Co-authored-by: Krzysztof Gogolewski <krzysztof.gogolewski@tweag.io>
* Add structured error messages for GHC.Rename.NamesTorsten Schmits2023-04-306-220/+448
| | | | | | | | | Tracking ticket: #20115 MR: !10336 This converts uses of `mkTcRnUnknownMessage` to newly added constructors of `TcRnMessage`.
* Add the Unsatisfiable classsheaf2023-04-2919-77/+496
| | | | | | | | | This commit implements GHC proposal #433, adding the Unsatisfiable class to the GHC.TypeError module. This provides an alternative to TypeError for which error reporting is more predictable: we report it when we are reporting unsolved Wanted constraints. Fixes #14983 #16249 #16906 #18310 #20835
* JS: change GHC.JS.Transform.identsS/E/V to take a saturated IR (#23304)Josh Meredith2023-04-272-37/+34
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* EPA: Use ExplicitBraces only in HsModuleAlan Zimmerman2023-04-262-12/+9
| | | | | | | | | !9018 brought in exact print annotations in LayoutInfo for open and close braces at the top level. But it retained them in the HsModule annotations too. Remove the originals, so exact printing uses LayoutInfo
* Refactor GenStgRhs to include the Type in both constructors (#23280, #22576, ↵Josh Meredith2023-04-2623-143/+136
| | | | | | | | | #22364) Carry the actual type of an expression through the PreStgRhs and into GenStgRhs for use in later stages. Currently this is used in the JavaScript backend to fix some tests from the above mentioned issues: EtaExpandLevPoly, RepPolyWrappedVar2, T13822, T14749.
* DmdAnal: Unleash demand signatures of free RULE and unfolding binders (#23208)Sebastian Graf2023-04-264-255/+307
| | | | | | | | | | | | | | | | | | | | | | | | | | | In #23208 we observed that the demand signature of a binder occuring in a RULE wasn't unleashed, leading to a transitively used binder being discarded as absent. The solution was to use the same code path that we already use for handling exported bindings. See the changes to `Note [Absence analysis for stable unfoldings and RULES]` for more details. I took the chance to factor out the old notion of a `PlusDmdArg` (a pair of a `VarEnv Demand` and a `Divergence`) into `DmdEnv`, which fits nicely into our existing framework. As a result, I had to touch quite a few places in the code. This refactoring exposed a few small bugs around correct handling of bottoming demand environments. As a result, some strictness signatures now mention uniques that weren't there before which caused test output changes to T13143, T19969 and T22112. But these tests compared whole -ddump-simpl listings which is a very fragile thing to begin with. I changed what exactly they test for based on the symptoms in the corresponding issues. There is a single regression in T18894 because we are more conservative around stable unfoldings now. Unfortunately it is not easily fixed; let's wait until there is a concrete motivation before invest more time. Fixes #23208.
* More informative errors for bad imports (#21826)Soham Chowdhury2023-04-259-114/+263
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* compiler: don't install signal handlers when the host platform doesn't have ↵Cheng Shao2023-04-241-0/+8
| | | | | | | | | | signals Previously, large parts of GHC API will transitively invoke withSignalHandlers, which doesn't work on host platforms without signal functionality at all (e.g. wasm32-wasi). By making withSignalHandlers a no-op on those platforms, we can make more parts of GHC API work out of the box when signals aren't supported.
* Implement -jsem: parallelism controlled by semaphoressheaf2023-04-204-56/+638
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | See https://github.com/ghc-proposals/ghc-proposals/pull/540/ for a complete description for the motivation for this feature. The `-jsem` option allows a build tool to pass a semaphore to GHC which GHC can use in order to control how much parallelism it requests. GHC itself acts as a client in the GHC jobserver protocol. ``` GHC Jobserver Protocol ~~~~~~~~~~~~~~~~~~~~~~ This proposal introduces the GHC Jobserver Protocol. This protocol allows a server to dynamically invoke many instances of a client process, while restricting all of those instances to use no more than <n> capabilities. This is achieved by coordination over a system semaphore (either a POSIX semaphore [6]_ in the case of Linux and Darwin, or a Win32 semaphore [7]_ in the case of Windows platforms). There are two kinds of participants in the GHC Jobserver protocol: - The *jobserver* creates a system semaphore with a certain number of available tokens. Each time the jobserver wants to spawn a new jobclient subprocess, it **must** first acquire a single token from the semaphore, before spawning the subprocess. This token **must** be released once the subprocess terminates. Once work is finished, the jobserver **must** destroy the semaphore it created. - A *jobclient* is a subprocess spawned by the jobserver or another jobclient. Each jobclient starts with one available token (its *implicit token*, which was acquired by the parent which spawned it), and can request more tokens through the Jobserver Protocol by waiting on the semaphore. Each time a jobclient wants to spawn a new jobclient subprocess, it **must** pass on a single token to the child jobclient. This token can either be the jobclient's implicit token, or another token which the jobclient acquired from the semaphore. Each jobclient **must** release exactly as many tokens as it has acquired from the semaphore (this does not include the implicit tokens). ``` Build tools such as cabal act as jobservers in the protocol and are responsibile for correctly creating, cleaning up and managing the semaphore. Adds a new submodule (semaphore-compat) for managing and interacting with semaphores in a cross-platform way. Fixes #19349
* JS: fix thread-related primopsSylvain Henry2023-04-191-1/+1
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* Don't panic in ltPatersonSizesheaf2023-04-181-20/+35
| | | | | | | | | | | | | | | | The function GHC.Tc.Utils.TcType.ltPatersonSize would panic when it encountered a type family on the RHS, as usually these are not allowed (type families are not allowed on the RHS of class instances or of quantified constraints). However, it is possible to still encounter type families on the RHS after doing a bit of constraint solving, as seen in test case T23171. This could trigger the panic in the call to ltPatersonSize in GHC.Tc.Solver.Canonical.mk_strict_superclasses, which is involved in avoiding loopy superclass constraints. This patch simply changes ltPatersonSize to return "I don't know, because there's a type family involved" in these cases. Fixes #23171
* Convert interface file loading errors into proper diagnosticsMatthew Pickering2023-04-1824-395/+730
| | | | | | | | | | | | | | This patch converts all the errors to do with loading interface files into proper structured diagnostics. * DriverMessage: Sometimes in the driver we attempt to load an interface file so we embed the IfaceMessage into the DriverMessage. * TcRnMessage: Most the time we are loading interface files during typechecking, so we embed the IfaceMessage This patch also removes the TcRnInterfaceLookupError constructor which is superceded by the IfaceMessage, which is now structured compared to just storing an SDoc before.
* Misc cleanupKrzysztof Gogolewski2023-04-177-27/+26
| | | | | | - Use dedicated list functions - Make cloneBndrs and cloneRecIdBndrs monadic - Fix invalid haddock comments in libraries/base
* validDerivPred: Reject exotic constraints in IrredPredsRyan Scott2023-04-172-99/+175
| | | | | | | | | | | | | | | | | | | | | | | | | This brings the `IrredPred` case in sync with the treatment of `ClassPred`s as described in `Note [Valid 'deriving' predicate]` in `GHC.Tc.Validity`. Namely, we should reject `IrredPred`s that are inferred from `deriving` clauses whose arguments contain other type constructors, as described in `(VD2) Reject exotic constraints` of that Note. This has the nice property that `deriving` clauses whose inferred instance context mention `TypeError` will now emit the type error in the resulting error message, which better matches existing intuitions about how `TypeError` should work. While I was in town, I noticed that much of `Note [Valid 'deriving' predicate]` was duplicated in a separate `Note [Exotic derived instance contexts]` in `GHC.Tc.Deriv.Infer`. I decided to fold the latter Note into the former so that there is a single authority on describing the conditions under which an inferred `deriving` constraint can be considered valid. This changes the behavior of `deriving` in a way that existing code might break, so I have made a mention of this in the GHC User's Guide. It seems very, very unlikely that much code is relying on this strange behavior, however, and even if there is, there is a clear, backwards-compatible migration path using `StandaloneDeriving`. Fixes #22696.
* Account for special GHC.Prim import in warnUnusedPackagesMatthew Pickering2023-04-171-3/+7
| | | | | | | | | | | | The GHC.Prim import is treated quite specially primarily because there isn't an interface file for GHC.Prim. Therefore we record separately in the ModSummary if it's imported or not so we don't go looking for it. This logic hasn't made it's way to `-Wunused-packages` so if you imported GHC.Prim then the warning would complain you didn't use `-package ghc-prim`. Fixes #23212
* Add import lists to few GHC.Driver.Session importsOleg Grenrus2023-04-164-4/+6
| | | | | | Related to https://gitlab.haskell.org/ghc/ghc/-/issues/23261. There are a lot of GHC.Driver.Session which only use DynFlags, but not the parsing code.
* Transfer DFunId_ness onto specialised bindingsSimon Peyton Jones2023-04-161-41/+78
| | | | | | | | | | | | | | | | | | | | Whether a binding is a DFunId or not has consequences for the `-fdicts-strict` flag, essentially if we are doing demand analysis for a DFunId then `-fdicts-strict` does not apply because the constraint solver can create recursive groups of dictionaries. In #22549 this was fixed for the "normal" case, see Note [Do not strictify the argument dictionaries of a dfun]. However the loop still existed if the DFunId was being specialised. The problem was that the specialiser would specialise a DFunId and turn it into a VanillaId and so the demand analyser didn't know to apply special treatment to the binding anymore and the whole recursive group was optimised to bottom. The solution is to transfer over the DFunId-ness of the binding in the specialiser so that the demand analyser knows not to apply the `-fstrict-dicts`. Fixes #22549
* Handle ConcreteTvs in inferResultToTypewip/T23153sheaf2023-04-156-31/+53
| | | | | | | | | | inferResultToType was discarding the ir_frr information, which meant some metavariables ended up being MetaTvs instead of ConcreteTvs. This function now creates new ConcreteTvs as necessary, instead of always creating MetaTvs. Fixes #23154
* Show an error when we cannot default a concrete tyvarKrzysztof Gogolewski2023-04-154-4/+31
| | | | Fixes #23153
* Make approximateWC a bit clevererwip/T22194-flagsSimon Peyton Jones2023-04-141-61/+94
| | | | | | | | | | | This MR fixes #23224: making approximateWC more clever See the long `Note [ApproximateWC]` in GHC.Tc.Solver All this is delicate and ad-hoc -- but it /has/ to be: we are talking about inferring a type for a binding in the presence of GADTs, type families and whatnot: known difficult territory. We just try as hard as we can.
* Improve partial signaturesSimon Peyton Jones2023-04-144-104/+137
| | | | | | | | | | | | | | | | | | | | | | | This MR fixes #23223. The changes are in two places: * GHC.Tc.Bind.checkMonomorphismRestriction See the new `Note [When the MR applies]` We now no longer stupidly attempt to apply the MR when the user specifies a context, e.g. f :: Eq a => _ -> _ * GHC.Tc.Solver.decideQuantification See rewritten `Note [Constraints in partial type signatures]` Fixing this bug apparently breaks three tests: * partial-sigs/should_compile/T11192 * partial-sigs/should_fail/Defaulting1MROff * partial-sigs/should_fail/T11122 However they are all symptoms of #23232, so I'm marking them as expect_broken(23232). I feel happy about this MR. Nice.
* Add some documentation about redundant constraintsSimon Peyton Jones2023-04-142-5/+28
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* Major refactor in the handling of equality constraintsSimon Peyton Jones2023-04-1420-1165/+2061
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This MR substantially refactors the way in which the constraint solver deals with equality constraints. The big thing is: * Intead of a pipeline in which we /first/ canonicalise and /then/ interact (the latter including performing unification) the two steps are more closely integreated into one. That avoids the current rather indirect communication between the two steps. The proximate cause for this refactoring is fixing #22194, which involve solving [W] alpha[2] ~ Maybe (F beta[4]) by doing this: alpha[2] := Maybe delta[2] [W] delta[2] ~ F beta[4] That is, we don't promote beta[4]! This is very like introducing a cycle breaker, and was very awkward to do before, but now it is all nice. See GHC.Tc.Utils.Unify Note [Promotion and level-checking] and Note [Family applications in canonical constraints]. The big change is this: * Several canonicalisation checks (occurs-check, cycle-breaking, checking for concreteness) are combined into one new function: GHC.Tc.Utils.Unify.checkTyEqRhs This function is controlled by `TyEqFlags`, which says what to do for foralls, type families etc. * `canEqCanLHSFinish` now sees if unification is possible, and if so, actually does it: see `canEqCanLHSFinish_try_unification`. There are loads of smaller changes: * The on-the-fly unifier `GHC.Tc.Utils.Unify.unifyType` has a cheap-and-cheerful version of `checkTyEqRhs`, called `simpleUnifyCheck`. If `simpleUnifyCheck` succeeds, it can unify, otherwise it defers by emitting a constraint. This is simpler than before. * I simplified the swapping code in `GHC.Tc.Solver.Equality.canEqCanLHS`. Especially the nasty stuff involving `swap_for_occurs` and `canEqTyVarFunEq`. Much nicer now. See Note [Orienting TyVarLHS/TyFamLHS] Note [Orienting TyFamLHS/TyFamLHS] * Added `cteSkolemOccurs`, `cteConcrete`, and `cteCoercionHole` to the problems that can be discovered by `checkTyEqRhs`. * I fixed #23199 `pickQuantifiablePreds`, which actually allows GHC to to accept both cases in #22194 rather than rejecting both. Yet smaller: * Added a `synIsConcrete` flag to `SynonymTyCon` (alongside `synIsFamFree`) to reduce the need for synonym expansion when checking concreteness. Use it in `isConcreteType`. * Renamed `isConcrete` to `isConcreteType` * Defined `GHC.Core.TyCo.FVs.isInjectiveInType` as a more efficient way to find if a particular type variable is used injectively than finding all the injective variables. It is called in `GHC.Tc.Utils.Unify.definitely_poly`, which in turn is used quite a lot. * Moved `rewriterView` to `GHC.Core.Type`, so we can use it from the constraint solver. Fixes #22194, #23199 Compile times decrease by an average of 0.1%; but there is a 7.4% drop in compiler allocation on T15703. Metric Decrease: T15703
* Stop if type constructors have kind errorsSimon Peyton Jones2023-04-141-1/+7
| | | | | | | | | Otherwise we get knock-on errors, such as #23252. This makes GHC fail a bit sooner, and I have not attempted to add recovery code, to add a fake TyCon place of the erroneous one, in an attempt to get more type errors in one pass. We could do that (perhaps) if there was a call for it.
* Make WordQuotRem2Op ok-for-speculation tooSylvain Henry2023-04-132-3/+6
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* Make Int64/Word64 division ok for speculation too.Sylvain Henry2023-04-131-1/+7
| | | | Only when the divisor is definitely non-zero.
* Add quot folding rule (#22152)Sylvain Henry2023-04-132-16/+89
| | | | | | | (x / l1) / l2 l1 and l2 /= 0 l1*l2 doesn't overflow ==> x / (l1 * l2)
* Add quotRem rules (#22152)Sylvain Henry2023-04-132-0/+65
| | | | | | | | | | | | | | case quotRemInt# x y of (# q, _ #) -> body ====> case quotInt# x y of q -> body case quotRemInt# x y of (# _, r #) -> body ====> case remInt# x y of r -> body
* Allow generation of TTH syntax with THOleg Grenrus2023-04-121-0/+4
| | | | | | | | | | | | | | | | | | | | In other words allow generation of typed splices and brackets with Untyped Template Haskell. That is useful in cases where a library is build with TTH in mind, but we still want to generate some auxiliary declarations, where TTH cannot help us, but untyped TH can. Such example is e.g. `staged-sop` which works with TTH, but we would like to derive `Generic` declarations with TH. An alternative approach is to use `unsafeCodeCoerce`, but then the derived `Generic` instances would be type-checked only at use sites, i.e. much later. Also `-ddump-splices` output is quite ugly: user-written instances would use TTH brackets, not `unsafeCodeCoerce`. This commit doesn't allow generating of untyped template splices and brackets with untyped TH, as I don't know why one would want to do that (instead of merging the splices, e.g.)
* Clarify a couple of Notes about 'nospec'Simon Peyton Jones2023-04-112-5/+12
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