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[Git][ghc/ghc][wip/ani/tc-expand] 42 commits: Add 128-bit SIMD support to AArch64 NCG
by Simon Peyton Jones (＠simonpj) 26 Mar '26
by Simon Peyton Jones (＠simonpj) 26 Mar '26
26 Mar '26
Simon Peyton Jones pushed to branch wip/ani/tc-expand at Glasgow Haskell Compiler / GHC
Commits:
2a218737 by ARATA Mizuki at 2026-03-23T11:11:39-04:00
Add 128-bit SIMD support to AArch64 NCG
Changes:
- Add `Format` field to vector-capable instructions.
These instructions will emit `vN.4s` (for example) as a operand.
- Additional constructors for `Operand`:
`OpVecLane` represents a vector lane and will be emitted as `vN.<width>[<index>]` (`vN.s[3]` for example).
`OpScalarAsVec` represents a scalar, but printed as a vector lane like `vN.<width>[0]` (`vN.s[0]` for example).
- Integer quot/rem are implemented in C, like x86.
Closes #26536
Metric Increase:
T3294
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5d6e2be9 by ARATA Mizuki at 2026-03-23T11:11:39-04:00
AArch64 NCG: Improve code generation for floating-point and vector constants
Some floating-point constants can be directly encoded using the FMOV instruction.
Similarly, a class of vectors with same values can be encoded using FMOV, MOVI, or MVNI.
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c6d262aa by Simon Jakobi at 2026-03-23T11:12:22-04:00
Add regression test for #13729
Closes #13729.
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aa5dfe67 by Sylvain Henry at 2026-03-26T03:48:56-04:00
Check that shift values are valid
In GHC's codebase in non-DEBUG builds we silently substitute shiftL/R
with unsafeShiftL/R for performance reasons. However we were not
checking that the shift value was valid for unsafeShiftL/R, leading to
wrong computations, but only in non-DEBUG builds.
This patch adds the necessary checks and reports an error when a wrong
shift value is passed.
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c8a7b588 by Sylvain Henry at 2026-03-26T03:48:56-04:00
Implement basic value range analysis (#25718)
Perform basic value range analysis to try to determine at compile time
the result of the application of some comparison primops (ltWord#, etc.).
This subsumes the built-in rewrite rules used previously to check if one
of the comparison argument was a bound (e.g. (x :: Word8) <= 255 is
always True). Our analysis is more powerful and handles type
conversions: e.g. word8ToWord x <= 255 is now detected as always True too.
We also use value range analysis to filter unreachable alternatives in
case-expressions. To support this, we had to allow case-expressions for
primitive types to not have a DEFAULT alternative (as was assumed before
and checked in Core lint).
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a5ec467e by ARATA Mizuki at 2026-03-26T03:49:49-04:00
rts: Align stack to 64-byte boundary in StgRun on x86
When LLVM spills AVX/AVX-512 vector registers to the stack, it requires
32-byte (__m256) or 64-byte (__m512) alignment. If the stack is not
sufficiently aligned, LLVM inserts a realignment prologue that reserves
%rbp as a frame pointer, conflicting with GHC's use of %rbp as an STG
callee-saved register and breaking the tail-call-based calling convention.
Previously, GHC worked around this by lying to LLVM about the stack
alignment and rewriting aligned vector loads/stores (VMOVDQA, VMOVAPS)
to unaligned ones (VMOVDQU, VMOVUPS) in the LLVM Mangler. This had two
problems:
- It did not extend to AVX-512, which requires 64-byte alignment. (#26595)
- When Haskell calls a C function that takes __m256/__m512 arguments on
the stack, the callee requires genuine alignment, which could cause a
segfault. (#26822)
This patch genuinely aligns the stack to 64 bytes in StgRun by saving
the original stack pointer before alignment and restoring it in
StgReturn. We now unconditionally advertise 64-byte stack alignment to
LLVM for all x86 targets, making rewriteAVX in the LLVM Mangler
unnecessary. STG_RUN_STACK_FRAME_SIZE is increased from 48 to 56 bytes
on non-Windows x86-64 to store the saved stack pointer.
Closes #26595 and #26822
Co-Authored-By: Claude Opus 4.5 <noreply(a)anthropic.com>
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661da815 by Teo Camarasu at 2026-03-26T03:50:33-04:00
ghc-internal: Float Generics to near top of module graph
We remove GHC.Internal.Generics from the critical path of the
`ghc-internal` module graph. GHC.Internal.Generics used to be in the
middle of the module graph, but now it is nearer the top (built later).
This change thins out the module graph and allows us to get rid of the
ByteOrder hs-boot file.
We implement this by moving Generics instances from the module where the
datatype is defined to the GHC.Internal.Generics module. This trades off
increasing the compiled size of GHC.Internal.Generics with reducing the
dependency footprint of datatype modules.
Not all instances are moved to GHC.Internal.Generics. For instance,
`GHC.Internal.Control.Monad.Fix` keeps its instance as it is one of the
very last modules compiled in `ghc-internal` and so inverting the
relationship here would risk adding GHC.Internal.Generics back onto the
critical path.
We also don't change modules that are re-exported from the `template-haskell` or `ghc-heap`.
This is done to make it easy to eventually move `Generics` to `base`
once something like #26657 is implemented.
Resolves #26930
Metric Decrease:
T21839c
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45428f88 by sheaf at 2026-03-26T03:51:31-04:00
Avoid infinite loop in deep subsumption
This commit ensures we only unify after we recur in the deep subsumption
code in the FunTy vs non-FunTy case of GHC.Tc.Utils.Unify.tc_sub_type_deep,
to avoid falling into an infinite loop.
See the new Wrinkle [Avoiding a loop in tc_sub_type_deep] in
Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify.
Fixes #26823
Co-authored-by: simonpj <simon.peytonjones(a)gmail.com>
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2823b039 by Ian Duncan at 2026-03-26T03:52:21-04:00
AArch64: fix MOVK regUsageOfInstr to mark dst as both read and written
MOVK (move with keep) modifies only a 16-bit slice of the destination
register, so the destination is both read and written. The register
allocator must know this to avoid clobbering live values. Update
regUsageOfInstr to list the destination in both src and dst sets.
No regression test: triggering the misallocation requires specific
register pressure around a MOVK sequence, which is difficult to
reliably provoke from Haskell source.
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57b7878d by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #12002
Closes #12002.
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c8f9df2d by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #12046
Closes #12046.
Co-authored-by: Andreas Klebinger <klebinger.andreas(a)gmx.at>
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615d72ac by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #13180
Closes #13180.
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423eebcf by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #11141
Closes #11141.
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286849a4 by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #11505
Closes #11505.
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7db149d9 by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression perf test for #13820
Closes #13820.
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e73c4adb by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #10381
Closes #10381.
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5ebcfb57 by Benjamin Maurer at 2026-03-26T03:54:02-04:00
Generate assembly on x86 for word2float (#22252)
We used to emit C function call for MO_UF_Conv primitive.
Now emits direct assembly instead.
Co-Authored-By: Sylvain Henry <sylvain(a)haskus.fr>
Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com>
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5b550754 by Matthew Pickering at 2026-03-26T03:54:51-04:00
rts: forward clone-stack messages after TSO migration
MSG_CLONE_STACK assumed that the target TSO was still owned by the
capability that received the message. This is not always true: the TSO
can migrate before the inbox entry is handled.
When that happened, handleCloneStackMessage could clone a live stack from
the wrong capability and use the wrong capability for allocation and
performTryPutMVar, leading to stack sanity failures such as
checkStackFrame: weird activation record found on stack.
Fix this by passing the current capability into
handleCloneStackMessage, rechecking msg->tso->cap at handling time, and
forwarding the message if the TSO has migrated. Once ownership matches,
use the executing capability consistently for cloneStack, rts_apply, and
performTryPutMVar.
Fixes #27008
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ef0a1bd2 by mangoiv at 2026-03-26T03:55:34-04:00
release tracking: adopt release tracking ticket from #16816
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a7f40fd9 by mangoiv at 2026-03-26T03:55:34-04:00
release tracking: add a release tracking ticket
Brings the information in the release tracking ticket up to date with
https://gitlab.haskell.org/ghc/ghc-hq/-/blob/main/release-management.mkd
Resolves #26691
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161d3285 by Teo Camarasu at 2026-03-26T03:56:18-04:00
Revert "Set default eventlog-flush-interval to 5s"
Flushing the eventlog forces a synchronisation of all the capabilities
and there was a worry that this might lead to a performance cost for
some highly parallel workloads.
This reverts commit 66b96e2a591d8e3d60e74af3671344dfe4061cf2.
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36eed985 by Cheng Shao at 2026-03-26T03:57:03-04:00
ghc-boot: move GHC.Data.SmallArray to ghc-boot
This commit moves `GHC.Data.SmallArray` from the `ghc` library to
`ghc-boot`, so that it can be used by `ghci` as well:
- The `Binary` (from `ghc`) instance of `SmallArray` is moved to
`GHC.Utils.Binary`
- Util functions `replicateSmallArrayIO`, `mapSmallArrayIO`,
`mapSmallArrayM_`, `imapSmallArrayM_` , `smallArrayFromList` and
`smallArrayToList` are added
- The `Show` instance is added
- The `Binary` (from `binary`) instance is added
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fdf828ae by Cheng Shao at 2026-03-26T03:57:03-04:00
compiler: use `Binary` instance of `BCOByteArray` for bytecode objects
This commit defines `Binary` (from `compiler`) instance of
`BCOByteArray` which serializes the underlying buffer directly, and
uses it directly in bytecode object serialization. Previously we reuse
the `Binary` (from `binary`) instance, and this change allows us to
avoid double-copying via an intermediate `ByteString` when using
`put`/`get` in `binnary`. Also see added comment for explanation.
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3bf62d0a by Cheng Shao at 2026-03-26T03:57:03-04:00
ghci: use SmallArray directly in ResolvedBCO
This patch makes ghci use `SmallArray` directly in `ResolvedBCO` when
applicable, making the memory representation more compact and reducing
marshaling overhead. Closes #27058.
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3d6492ce by Wen Kokke at 2026-03-26T03:57:53-04:00
Fix race condition between flushEventLog and start/endEventLogging.
This commit changes `flushEventLog` to acquire/release the `state_change` mutex to prevent interleaving with `startEventLogging` and `endEventLogging`. In the current RTS, `flushEventLog` _does not_ acquire this mutex, which may lead to eventlog corruption on the following interleaving:
- `startEventLogging` writes the new `EventLogWriter` to `event_log_writer`.
- `flushEventLog` flushes some events to `event_log_writer`.
- `startEventLogging` writes the eventlog header to `event_log_writer`.
This causes the eventlog to be written out in an unreadable state, with one or more events preceding the eventlog header.
This commit renames the old function to `flushEventLog_` and defines `flushEventLog` simply as:
```c
void flushEventLog(Capability **cap USED_IF_THREADS)
{
ACQUIRE_LOCK(&state_change_mutex);
flushEventLog_(cap);
RELEASE_LOCK(&state_change_mutex);
}
```
The old function is still needed internally within the compilation unit, where it is used in `endEventLogging` in a context where the `state_change` mutex has already been acquired. I've chosen to mark `flushEventLog_` as static and let other uses of `flushEventLog` within the RTS refer to the new version. There is one use in `hs_init_ghc` via `flushTrace`, where the new locking behaviour should be harmless, and one use in `handle_tick`, which I believe was likely vulnerable to the same race condition, so the new locking behaviour is desirable.
I have not added a test. The behaviour is highly non-deterministic and requires a program that concurrently calls `flushEventLog` and `startEventLogging`/`endEventLogging`. I encountered the issue while developing `eventlog-socket` and within that context have verified that my patch likely addresses the issue: a test that used to fail within the first dozen or so runs now has been running on repeat for several hours.
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7b9a75f0 by Phil Hazelden at 2026-03-26T03:58:37-04:00
Fix build with werror on glibc 2.43.
We've been defining `_XOPEN_SOURCE` and `_POSIX_C_SOURCE` to the same
values as defined in glibc prior to 2.43. But in 2.43, glibc changes
them to new values, which means we get a warning when redefining them.
By `#undef`ing them first, we no longer get a warning.
Closes #27076.
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fe6e76c5 by Tobias Haslop at 2026-03-26T03:59:30-04:00
Fix broken Haddock link to Bifunctor class in description of Functor class
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5506b415 by Apoorv Ingle at 2026-03-26T23:42:05+00:00
Work for #25001
Notes added [Error Context Stack] [Typechecking by expansion: overview]
Notes updated Note [Expanding HsDo with XXExprGhcRn]
-------------------------
Metric Decrease:
T9020
-------------------------
* Streamlines implementations of `tcExpr` and `tcXExpr` to work on `XExpr`
* Kills `VACtxt` (and its associated `VAExpansion` and `VACall`) datatype, it is subsumed by simply a `SrcSpan`.
* Kills the function `addHeadCtxt` as it is now mearly setting a location
* The function `tcValArgs` does its own argument number management
* Makes `splitHsApps` not look through `XExpr`
* `tcExprSigma` is called if the head of the expression after calling `splitHsApps` turns out to be an `XExpr`
* Removes location information from `OrigPat` payload
* Removes special case of tcBody from `tcLambdaMatches`
* Removes special case of `dsExpr` for `ExpandedThingTc`
* Rename `HsThingRn` to `SrcCodeCtxt`
* Kills `tcl_in_gen_code` and `tcl_err_ctxt`. It is subsumed by `ErrCtxtStack`
* Kills `ExpectedFunTyOrig`. It is subsumed by `CtOrigin`
* Fixes `CtOrigin` for `HsProjection` case in `exprCtOrigin`. It was previously assigned to be `SectionOrigin`. It is now just the expression
* Adds a new `CtOrigin.ExpansionOrigin` for storing the original syntax
* Adds a new `CtOrigin.ExpectedTySyntax` as a replacement for `ExpectedTySyntaxOp`. Cannot kill the former yet because of `ApplicativeDo`
* Renames `tcMonoExpr` -> `tcMonoLExpr`, `tcMonoExprNC` -> `tcMonoLExpr`
* Renames `EValArg`, `EValArgQL` fields: `ea_ctxt` -> `ea_loc_span` and `eaql_ctx` -> `eaql_loc_span`
* kill `PopErrCtxt` from `XXExprGhcRn`
* simplify `addArgCtxt` and push `setSrcSpan` inside `addLExprCtxt`. Make sure addExprCtxt is not called by itself
* fun_orig in tcApp depends on the SrcSpan of the head of the application chain (similar to addArgCtxt)
* rename fun_ctxt to fun_lspan, fun_orig passed in tcInstFun to default to app chain head if its user located, fall back to srcCodeOrigin if it's a generated location
* fix quickLookArg function to blame the correct application chain head. The arguments application chain head should be blamed, not the original head when we quick look arg
* Make sure only expression wrapped around generated src span are ignored while adding them to the error context stack
* `getDeepSubsumptionFlag_DataConHead` performs a non-trivial traversal if the expression passed to it is complex.
This traversal is necessary if the head of the function is an `XExpr` and `splitHsApps` does not look through them
- The deepsubsumption flag is stored in EVAlArgQL to reduce the need to call `getDeepSubsumptionFlag_DataConHead`
- `getDeepSubsumptionFlag_DataConHead` is called in `tcExprSigma` and `tcInferAppHead` to reduce AST traversals
* Make a new variant `GeneratedSrcSpan` in `SrcSpan` for HIEAst Nodes
* wrap `fromListN` with a generated src span with GeneratedSrcSpanDetails field to store the original srcspan
* remove `UnhelpfulGenerated` from `UnhelpfulSpanReason` and into new datatype `GeneratedSrcSpanDetails`
* trying to remove SrcCodeOrigin by merging it with ErrCtxtMsg
* ErrCtxtMsg is now HsCtxt
* Landmarks are now just computed on the fly
* killed off CodeSrcFlag
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b9243204 by Apoorv Ingle at 2026-03-26T23:42:05+00:00
make HsExpandedRn and HsExpandedTc payload LExpr,
add tcExpand for expanding Do expressions before typechecking in tcExpr
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bc589874 by Apoorv Ingle at 2026-03-26T23:42:05+00:00
* make HsExpandedRn and HsExpandedTc payload LExpr, HsExpand to mediate between expansion and typechecking
* add tcHsExpand type checking expanded Expressions
* remove setInGeneratedCode
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1119a2cd by Apoorv Ingle at 2026-03-26T23:42:05+00:00
remove srcCodeOrigin references, add some WIP flag
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2a837369 by Apoorv Ingle at 2026-03-26T23:42:05+00:00
accept callstack001 testcase
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dbf0e1cb by Apoorv Ingle at 2026-03-26T23:42:05+00:00
update Note to include HsExpansion
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1f31a3d8 by Simon Peyton Jones at 2026-03-26T23:42:05+00:00
Tidying up from Simon
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db5ae568 by Simon Peyton Jones at 2026-03-26T23:42:05+00:00
More from Simon
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4321764f by Apoorv Ingle at 2026-03-26T23:42:05+00:00
remove unused function
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62652e92 by Apoorv Ingle at 2026-03-26T23:42:05+00:00
account for rebase changes
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d7f93b98 by Apoorv Ingle at 2026-03-26T23:42:06+00:00
Wrinkle [Why GeneratedSrcSpanDetails in GeneratedSrcSpan] in Note [Typechecking by expansion: overview]
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54057519 by Apoorv Ingle at 2026-03-26T23:42:06+00:00
replace tcInferAppHead with tcInferExprSigma, remove ds_flag from EValArgQL
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310927e9 by Simon Peyton Jones at 2026-03-26T23:42:06+00:00
Fixes from Simon [skip ci]
..need documentation.
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72c9dcaf by Simon Peyton Jones at 2026-03-26T23:42:06+00:00
Fixes from Simon
Looking much nicer now
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678b6eb3 by Simon Peyton Jones at 2026-03-26T23:42:06+00:00
Wibble
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252 changed files:
- + .gitlab/issue_templates/release_tracking.md
- compiler/CodeGen.Platform.h
- compiler/GHC.hs
- compiler/GHC/ByteCode/Linker.hs
- compiler/GHC/ByteCode/Serialize.hs
- compiler/GHC/Cmm/Node.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/AArch64/Instr.hs
- compiler/GHC/CmmToAsm/AArch64/Ppr.hs
- compiler/GHC/CmmToAsm/AArch64/Regs.hs
- compiler/GHC/CmmToAsm/Reg/Graph/TrivColorable.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToLlvm.hs
- compiler/GHC/CmmToLlvm/Config.hs
- compiler/GHC/CmmToLlvm/Mangler.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- + compiler/GHC/Core/Opt/Range.hs
- compiler/GHC/Core/Opt/Simplify/Iteration.hs
- compiler/GHC/Driver/Config/CmmToLlvm.hs
- compiler/GHC/Driver/Config/StgToCmm.hs
- compiler/GHC/Hs/DocString.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/Expr.hs-boot
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Syn/Type.hs
- compiler/GHC/HsToCore/Expr.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Monad.hs
- compiler/GHC/HsToCore/Pmc.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Ext/Utils.hs
- compiler/GHC/Parser/HaddockLex.x
- compiler/GHC/Prelude/Basic.hs
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/Names.hs
- compiler/GHC/Rename/Utils.hs
- compiler/GHC/Runtime/Debugger/Breakpoints.hs
- compiler/GHC/StgToCmm/Expr.hs
- compiler/GHC/StgToCmm/Utils.hs
- compiler/GHC/Tc/Deriv.hs
- compiler/GHC/Tc/Deriv/Infer.hs
- compiler/GHC/Tc/Deriv/Utils.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Bind.hs
- compiler/GHC/Tc/Gen/Do.hs
- compiler/GHC/Tc/Gen/Export.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/Expr.hs-boot
- compiler/GHC/Tc/Gen/Head.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Gen/Match.hs
- compiler/GHC/Tc/Gen/Match.hs-boot
- compiler/GHC/Tc/Gen/Pat.hs
- compiler/GHC/Tc/Gen/Sig.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Instance/Class.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Tc/Solver/Solve.hs
- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/Class.hs
- compiler/GHC/Tc/TyCl/Instance.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Types/BasicTypes.hs
- compiler/GHC/Tc/Types/Constraint.hs
- compiler/GHC/Tc/Types/CtLoc.hs
- compiler/GHC/Tc/Types/ErrCtxt.hs
- compiler/GHC/Tc/Types/LclEnv.hs
- compiler/GHC/Tc/Types/Origin.hs
- compiler/GHC/Tc/Types/Origin.hs-boot
- compiler/GHC/Tc/Utils/Instantiate.hs
- compiler/GHC/Tc/Utils/Monad.hs
- compiler/GHC/Tc/Utils/TcMType.hs
- compiler/GHC/Tc/Utils/TcType.hs
- compiler/GHC/Tc/Utils/TcType.hs-boot
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Tc/Validity.hs
- compiler/GHC/Tc/Zonk/TcType.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/Types/Error.hs
- + compiler/GHC/Types/Error.hs-boot
- compiler/GHC/Types/Hint/Ppr.hs
- compiler/GHC/Types/Name/Reader.hs
- compiler/GHC/Types/SrcLoc.hs
- + compiler/GHC/Unit/State.hs-boot
- compiler/GHC/Utils/Binary.hs
- compiler/GHC/Utils/Logger.hs
- compiler/ghc.cabal.in
- docs/users_guide/9.16.1-notes.rst
- ghc/GHCi/UI.hs
- ghc/GHCi/UI/Info.hs
- compiler/GHC/Data/SmallArray.hs → libraries/ghc-boot/GHC/Data/SmallArray.hs
- libraries/ghc-boot/ghc-boot.cabal.in
- libraries/ghc-internal/src/GHC/Internal/Base.hs
- libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs
- − libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Char.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Foldable.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor/Const.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor/Identity.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Monoid.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Semigroup/Internal.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Traversable.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Version.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Control.hs
- libraries/ghc-internal/src/GHC/Internal/Functor/ZipList.hs
- libraries/ghc-internal/src/GHC/Internal/Generics.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Exception.hs
- libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc
- libraries/ghc-internal/src/GHC/Internal/Read.hs
- libraries/ghc-internal/src/GHC/Internal/Unicode/Bits.hs
- libraries/ghci/GHCi/CreateBCO.hs
- libraries/ghci/GHCi/ResolvedBCO.hs
- rts/CloneStack.c
- rts/CloneStack.h
- rts/Messages.c
- rts/RtsFlags.c
- rts/StgCRun.c
- rts/eventlog/EventLog.c
- rts/include/rts/Constants.h
- rts/include/rts/PosixSource.h
- rts/include/stg/Prim.h
- rts/prim/vectorQuotRem.c
- testsuite/tests/codeGen/should_run/Word2Float32.hs
- testsuite/tests/codeGen/should_run/Word2Float32.stdout
- testsuite/tests/codeGen/should_run/Word2Float64.hs
- testsuite/tests/codeGen/should_run/Word2Float64.stdout
- testsuite/tests/count-deps/CountDepsAst.stdout
- testsuite/tests/count-deps/CountDepsParser.stdout
- + testsuite/tests/driver/T13729/A/A.cabal
- + testsuite/tests/driver/T13729/A/Setup.hs
- + testsuite/tests/driver/T13729/A/TH.hs
- + testsuite/tests/driver/T13729/A/Types1.hs
- + testsuite/tests/driver/T13729/A/Types2.hs
- + testsuite/tests/driver/T13729/B/B.cabal
- + testsuite/tests/driver/T13729/B/Main.hs
- + testsuite/tests/driver/T13729/B/Setup.hs
- + testsuite/tests/driver/T13729/Makefile
- + testsuite/tests/driver/T13729/Setup.hs
- + testsuite/tests/driver/T13729/all.T
- testsuite/tests/ghci/prog-mhu001/prog-mhu001c.stdout
- testsuite/tests/ghci/scripts/ListTuplePunsPpr.stdout
- testsuite/tests/ghci/scripts/T10963.stderr
- testsuite/tests/ghci/scripts/ghci064.stdout
- testsuite/tests/indexed-types/should_fail/T2693.stderr
- testsuite/tests/indexed-types/should_fail/T5439.stderr
- testsuite/tests/interface-stability/base-exports.stdout
- testsuite/tests/interface-stability/base-exports.stdout-javascript-unknown-ghcjs
- testsuite/tests/interface-stability/base-exports.stdout-mingw32
- testsuite/tests/interface-stability/base-exports.stdout-ws-32
- testsuite/tests/monadfail/MonadFailErrors.stderr
- testsuite/tests/overloadedrecflds/should_fail/T26480b.stderr
- + testsuite/tests/parser/should_compile/T12002.hs
- + testsuite/tests/parser/should_compile/T12002.stderr
- testsuite/tests/parser/should_compile/all.T
- testsuite/tests/parser/should_fail/RecordDotSyntaxFail10.stderr
- testsuite/tests/parser/should_fail/RecordDotSyntaxFail11.stderr
- testsuite/tests/parser/should_fail/RecordDotSyntaxFail8.stderr
- testsuite/tests/parser/should_fail/RecordDotSyntaxFail9.stderr
- + testsuite/tests/perf/compiler/T13820.hs
- testsuite/tests/perf/compiler/all.T
- testsuite/tests/plugins/test-defaulting-plugin.stderr
- testsuite/tests/printer/T17697.stderr
- testsuite/tests/profiling/should_run/callstack001.stdout
- + testsuite/tests/rebindable/T10381.hs
- testsuite/tests/rebindable/all.T
- testsuite/tests/rebindable/rebindable6.stderr
- testsuite/tests/rep-poly/RepPolyDoBind.stderr
- testsuite/tests/rep-poly/RepPolyDoBody1.stderr
- testsuite/tests/rep-poly/RepPolyDoBody2.stderr
- testsuite/tests/rep-poly/RepPolyRecordUpdate.stderr
- testsuite/tests/rts/all.T
- + testsuite/tests/rts/cloneThreadStackMigrating.hs
- + testsuite/tests/simd/should_run/FloatConstant.hs
- + testsuite/tests/simd/should_run/FloatConstant.stdout
- + testsuite/tests/simd/should_run/IntConstant.hs
- + testsuite/tests/simd/should_run/IntConstant.stdout
- + testsuite/tests/simd/should_run/StackAlignment32.hs
- + testsuite/tests/simd/should_run/StackAlignment32.stdout
- + testsuite/tests/simd/should_run/StackAlignment32_main.c
- + testsuite/tests/simd/should_run/StackAlignment64.hs
- + testsuite/tests/simd/should_run/StackAlignment64.stdout
- + testsuite/tests/simd/should_run/StackAlignment64_main.c
- testsuite/tests/simd/should_run/all.T
- testsuite/tests/simd/should_run/int16x8_shuffle.hs
- testsuite/tests/simd/should_run/int16x8_shuffle.stdout
- testsuite/tests/simd/should_run/int16x8_shuffle_baseline.hs
- testsuite/tests/simd/should_run/int16x8_shuffle_baseline.stdout
- testsuite/tests/simd/should_run/int8x16_shuffle.hs
- testsuite/tests/simd/should_run/int8x16_shuffle.stdout
- testsuite/tests/simd/should_run/int8x16_shuffle_baseline.hs
- testsuite/tests/simd/should_run/int8x16_shuffle_baseline.stdout
- testsuite/tests/simd/should_run/simd013C.c
- + testsuite/tests/simplCore/should_compile/T19166.hs
- + testsuite/tests/simplCore/should_compile/T19166.stderr
- + testsuite/tests/simplCore/should_compile/T25718.hs
- + testsuite/tests/simplCore/should_compile/T25718.stderr
- + testsuite/tests/simplCore/should_compile/T25718a.hs
- + testsuite/tests/simplCore/should_compile/T25718a.stderr
- + testsuite/tests/simplCore/should_compile/T25718b.hs
- + testsuite/tests/simplCore/should_compile/T25718b.stderr
- + testsuite/tests/simplCore/should_compile/T25718c.hs
- + testsuite/tests/simplCore/should_compile/T25718c.stderr-ws-32
- + testsuite/tests/simplCore/should_compile/T25718c.stderr-ws-64
- testsuite/tests/simplCore/should_compile/all.T
- + testsuite/tests/typecheck/T13180/T13180.hs
- + testsuite/tests/typecheck/T13180/T13180.hs-boot
- + testsuite/tests/typecheck/T13180/T13180.stderr
- + testsuite/tests/typecheck/T13180/T13180A.hs
- + testsuite/tests/typecheck/T13180/all.T
- + testsuite/tests/typecheck/should_compile/ExpansionQLIm.hs
- + testsuite/tests/typecheck/should_compile/T11141.hs
- + testsuite/tests/typecheck/should_compile/T11141.stderr
- + testsuite/tests/typecheck/should_compile/T11505Bar.hs
- + testsuite/tests/typecheck/should_compile/T11505Foo.hs
- + testsuite/tests/typecheck/should_compile/T11505Foo.hs-boot
- + testsuite/tests/typecheck/should_compile/T12046.hs
- testsuite/tests/typecheck/should_compile/T14590.stderr
- testsuite/tests/typecheck/should_compile/T26225.hs
- testsuite/tests/typecheck/should_compile/all.T
- testsuite/tests/typecheck/should_compile/valid_hole_fits.stderr
- testsuite/tests/typecheck/should_fail/DoExpansion1.stderr
- testsuite/tests/typecheck/should_fail/DoExpansion2.stderr
- testsuite/tests/typecheck/should_fail/T10971d.stderr
- testsuite/tests/typecheck/should_fail/T13311.stderr
- + testsuite/tests/typecheck/should_fail/T26823.hs
- + testsuite/tests/typecheck/should_fail/T26823.stderr
- testsuite/tests/typecheck/should_fail/T3323.stderr
- testsuite/tests/typecheck/should_fail/T3613.stderr
- testsuite/tests/typecheck/should_fail/T6069.stderr
- testsuite/tests/typecheck/should_fail/T7851.stderr
- testsuite/tests/typecheck/should_fail/T7857.stderr
- testsuite/tests/typecheck/should_fail/T8603.stderr
- testsuite/tests/typecheck/should_fail/T9612.stderr
- testsuite/tests/typecheck/should_fail/all.T
- testsuite/tests/typecheck/should_fail/tcfail102.stderr
- testsuite/tests/typecheck/should_fail/tcfail128.stderr
- testsuite/tests/typecheck/should_fail/tcfail140.stderr
- testsuite/tests/typecheck/should_fail/tcfail181.stderr
- utils/check-exact/ExactPrint.hs
- utils/check-exact/Parsers.hs
- utils/check-exact/Transform.hs
- utils/check-exact/Utils.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Parser.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Utils.hs
The diff was not included because it is too large.
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Simon Peyton Jones pushed to branch wip/ani/tc-expand at Glasgow Haskell Compiler / GHC
Commits:
893b2ba6 by Simon Peyton Jones at 2026-03-26T23:41:25+00:00
Wibble
- - - - -
1 changed file:
- compiler/GHC/Tc/Gen/Expr.hs
Changes:
=====================================
compiler/GHC/Tc/Gen/Expr.hs
=====================================
@@ -679,17 +679,21 @@ tcExpr expr@(RecordCon { rcon_con = L loc qcon@(WithUserRdr _ con_name)
, rcon_con = L loc con_like
, rcon_flds = rbinds' }
+ ; co <- tcSubTypeMono expr actual_res_ty res_ty
+
-- Check for missing fields. We do this after type-checking to get
-- better types in error messages (cf #18869). For example:
-- data T a = MkT { x :: a, y :: a }
-- r = MkT { y = True }
-- Then we'd like to warn about a missing field `x :: True`, rather than `x :: a0`.
--
- -- NB: to do this really properly we should delay reporting until typechecking is complete,
- -- via a new `HoleSort`. But that seems too much work.
+ -- NB: to do this really properly we should delay reporting until typechecking
+ -- is complete, via a new `HoleSort`. But that seems too much work.
+ --
+ -- However, it's worth doing it after calling `tcSubTypeMono`,
+ -- which may do some useful unifications
; checkMissingFields con_like rbinds arg_tys
- ; co <- tcSubTypeMono expr actual_res_ty res_ty
; return (mkHsWrapCo co expr') }
where
orig = OccurrenceOf con_name
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/893b2ba640a22adc06e2c7a04c9ea5c…
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26 Mar '26
Simon Peyton Jones pushed to branch wip/ani/tc-expand at Glasgow Haskell Compiler / GHC
Commits:
a5163a87 by Simon Peyton Jones at 2026-03-26T23:14:13+00:00
Fixes from Simon
Looking much nicer now
- - - - -
8 changed files:
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/Head.hs
- compiler/GHC/Tc/Types/ErrCtxt.hs
- compiler/GHC/Tc/Utils/TcType.hs
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Tc/Zonk/TcType.hs
Changes:
=====================================
compiler/GHC/Tc/Errors/Ppr.hs
=====================================
@@ -7709,12 +7709,8 @@ pprHsCtxt = \case
PatSigErrCtxt sig_ty res_ty ->
vcat [ hang (text "When checking that the pattern signature:")
4 (ppr sig_ty)
- , nest 2 (hang (text "fits the type of its context:") 2 pp_res_ty) ]
- where
- -- Zonking will have turned Infer into Check
- pp_res_ty = case res_ty of
- Check ty -> ppr ty
- Infer ir -> text "OOPS" <+> ppr ir
+ , nest 2 (hang (text "fits the type of its context:")
+ 2 (ppr (getCheckExpType res_ty))) ]
PatCtxt pat ->
hang (text "In the pattern:") 2 (ppr pat)
@@ -7776,7 +7772,7 @@ pprHsCtxt = \case
full_herald = pprExpectedFunTyHerald herald
<+> speakNOf n_vis_args_in_call (text "visible argument")
-- What are "visible" arguments? See Note [Visibility and arity] in GHC.Types.Basic
- FunResCtxt fun n_val_args res_fun res_env n_fun n_env
+ FunResCtxt fun n_val_args fun_res_ty env_ty
| -- Check for too few args
-- fun_tau = a -> b, res_tau = Int
n_fun > n_env
@@ -7800,6 +7796,18 @@ pprHsCtxt = \case
-> empty
-- text "Debug" <+> vcat [ppr fun, ppr n_val_args, ppr res_fun, ppr res_env, ppr n_fun, ppr n_env]
where
+ -- See Note [Splitting nested sigma types in mismatched
+ -- function types]
+ -- env_ty is an ExpRhoTy, but with simple subsumption it
+ -- is not /deeply/ skolemised, so still use tcSplitNestedSigmaTys
+
+ (_,_,fun_tau) = tcSplitNestedSigmaTys fun_res_ty
+ (_, _, env_tau) = tcSplitNestedSigmaTys (getCheckExpType env_ty)
+ (args_fun, res_fun) = tcSplitFunTys fun_tau
+ (args_env, res_env) = tcSplitFunTys env_tau
+ n_fun = length args_fun
+ n_env = length args_env
+
not_fun ty -- ty is definitely not an arrow type,
-- and cannot conceivably become one
= case tcSplitTyConApp_maybe ty of
=====================================
compiler/GHC/Tc/Gen/App.hs
=====================================
@@ -354,6 +354,7 @@ tcApp :: HsExpr GhcRn
-> ExpRhoType -- When checking, -XDeepSubsumption <=> deeply skolemised
-> TcM (HsExpr GhcTc)
-- See Note [tcApp: typechecking applications]
+-- INVARIANT: the expression is an application of some kind
tcApp rn_expr exp_res_ty
= do { -- Step 1: Split the application chain
((rn_fun, fun_lspan), rn_args) <- splitHsApps rn_expr
@@ -366,6 +367,8 @@ tcApp rn_expr exp_res_ty
, text "rn_args:" <+> ppr rn_args ]
-- Step 2: Infer the type of `fun`, the head of the application
+ -- NB: we are certain that there is at least one argument, so inferring is
+ --
; (tc_fun, fun_sigma) <- tcInferExprSigma rn_fun
; let tc_head = (tc_fun, fun_lspan)
-- inst_final: top-instantiate the result type of the application,
@@ -458,44 +461,9 @@ checkResultTy :: HsExpr GhcRn
-- expose foralls, but maybe not /deeply/ instantiated
-> ExpRhoType -- Expected type; this is deeply skolemised
-> TcM HsWrapper
-checkResultTy rn_expr (tc_fun, _) _ app_res_rho (Infer inf_res)
- = do { ds_flag <- getDeepSubsumptionFlag_DataConHead tc_fun
- ; fillInferResult ds_flag (exprCtOrigin rn_expr) app_res_rho inf_res
- }
-
-checkResultTy rn_expr (tc_fun, fun_loc) inst_args app_res_rho (Check res_ty)
--- Unify with expected type from the context
--- See Note [Unify with expected type before typechecking arguments]
---
--- Match up app_res_rho: the result type of rn_expr
--- with res_ty: the expected result type
- = perhaps_add_res_ty_ctxt $
- do { ds_flag <- getDeepSubsumptionFlag_DataConHead tc_fun
- ; traceTc "checkResultTy {" $
- vcat [ text "tc_fun:" <+> ppr tc_fun
- , text "app_res_rho:" <+> ppr app_res_rho
- , text "res_ty:" <+> ppr res_ty
- , text "ds_flag:" <+> ppr ds_flag ]
- ; case ds_flag of
- Shallow -> -- No deep subsumption
- -- app_res_rho and res_ty are both rho-types,
- -- so with simple subsumption we can just unify them
- -- No need to zonk; the unifier does that
- do { co <- unifyExprType rn_expr app_res_rho res_ty
- ; traceTc "checkResultTy 1 }" (ppr co)
- ; return (mkWpCastN co) }
-
- Deep ds_reason -> -- Deep subsumption
- -- Even though both app_res_rho and res_ty are rho-types,
- -- they may have nested polymorphism, so if deep subsumption
- -- is on we must call tcSubType.
- do { wrap <- tcSubTypeDS tc_fun ds_reason rn_expr app_res_rho res_ty
- ; traceTc "checkResultTy 2 }" $
- vcat [ text "app_res_rho:" <+> ppr app_res_rho
- , text "res_ty:" <+> ppr res_ty
- , text "wrap:" <+> ppr wrap
- ]
- ; return wrap } }
+checkResultTy rn_expr (tc_fun, fun_loc) inst_args app_res_ty res_ty
+ = perhaps_add_res_ty_ctxt $
+ tcCheckAppResult rn_expr tc_fun app_res_ty res_ty
where
-- perhaps_add_res_ty_ctxt: Inside an expansion, the addFunResCtxt stuff is
-- more confusing than helpful because the function at the head isn't in
@@ -505,7 +473,7 @@ checkResultTy rn_expr (tc_fun, fun_loc) inst_args app_res_rho (Check res_ty)
| isGeneratedSrcSpan fun_loc
= thing_inside
| otherwise
- = addFunResCtxt tc_fun inst_args app_res_rho (mkCheckExpType res_ty) $
+ = addFunResCtxt tc_fun inst_args app_res_ty res_ty $
thing_inside
----------------
@@ -1915,12 +1883,15 @@ quickLookArg1 pos app_lspan (fun, fun_lspan) larg@(L _ arg) sc_arg_ty@(Scaled _
-- generated by calls in arg
do { ((rn_fun_arg, fun_lspan_arg), rn_args) <- splitHsApps arg
- ; if tooComplicatedForQuickLook rn_fun_arg
+ -- See Note [The head of an application]
+ ; if not (headOkForQuickLook rn_fun_arg)
then skipQuickLook app_lspan larg sc_arg_ty
else
-- Step 1: get the type of the head of the argument
- do { (fun_ue, (tc_fun_arg_head, fun_sigma_arg_head)) <- tcCollectingUsage $ tcInferExprSigma rn_fun_arg
+ do { (fun_ue, (tc_fun_arg_head, fun_sigma_arg_head))
+ <- tcCollectingUsage $
+ tcInferExprSigma rn_fun_arg
-- tcCollectingUsage: the use of an Id at the head generates usage-info
-- See the call to `tcEmitBindingUsage` in `check_local_id`. So we must
-- capture and save it in the `EValArgQL`. See (QLA6) in
@@ -2003,15 +1974,30 @@ mk_origin fun_lspan rn_fun
}
-tooComplicatedForQuickLook :: HsExpr GhcRn -> Bool
-tooComplicatedForQuickLook expr
+headOkForQuickLook :: HsExpr GhcRn -> Bool
+headOkForQuickLook expr
= case expr of
- HsVar {} -> False
- ExprWithTySig {} -> False
- XExpr (HsRecSelRn {}) -> False
- HsOverLit {} -> False
- _ -> True -- Too complicated
+ HsVar {} -> True
+ ExprWithTySig {} -> True
+ XExpr (HsRecSelRn {}) -> True
+ HsOverLit {} -> True
+ HsUntypedSplice {} -> True -- See #21077
+ _ -> False -- Too complicated
+
+{- Note [The head of an application]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Consider (f $ (\x -> blah))
+ where f :: (forall a. a->a) -> Int
+We really, really need to push down that (forall a. a->a) to the \x.
+
+But when doing QuickLook on the second argument of ($) in `quickLookArg1`, namely
+(\x -> blah), the `splitHsApps` will return an empty argument list, and a function
+part of (\x -> blah). We must NOT infer the type of the argument (\x -> blah),
+via `tcInferExprSigma`, because that will give a monotype to `x`.
+Instead we give up. Which is exactly what the paper says; QuickLook only does something
+when the head of the application is a variable.
+-}
{- *********************************************************************
* *
=====================================
compiler/GHC/Tc/Gen/Expr.hs
=====================================
@@ -304,41 +304,37 @@ tcExpr :: HsExpr GhcRn
-- is deeply skolemised
-> TcM (HsExpr GhcTc)
+-- Deal with expansions
+tcExpr (XExpr (ExpandedThingRn hse)) res_ty = tcHsExpansion hse res_ty
+
+tcExpr e@(HsVar _ v_rn) res_ty
+ = do { (v_tc, sigma_ty) <- tcInferId v_rn
+ ; wrap <- tcCheckAppResult e v_tc sigma_ty res_ty
+ ; return (mkHsWrap wrap v_tc) }
+
+tcExpr e@(ExprWithTySig _ e_rn e_ty) res_ty
+ = do { (e_tc, sigma_ty) <- tcExprWithSig e_rn e_ty
+ ; wrap <- tcCheckAppResult e e_tc sigma_ty res_ty
+ ; return (mkHsWrap wrap e_tc) }
+
+tcExpr e@(XExpr(HsRecSelRn f)) res_ty
+ = do { (e_tc, sigma_ty) <- tcInferRecSelId f
+ ; wrap <- tcCheckAppResult e e_tc sigma_ty res_ty
+ ; return (mkHsWrap wrap e_tc) }
+
-- Use tcApp to typecheck applications, which are treated specially
-- by Quick Look. Specifically:
--- - HsVar lone variables, to ensure that they can get an
--- impredicative instantiation (via Quick Look
--- driven by res_ty (in checking mode)).
-- - HsApp value applications
-- - HsAppType type applications
--- - ExprWithTySig (e :: type)
--- - HsRecSel overloaded record fields
--- - ExpandedThingRn renamer/pre-typechecker expansions
-- - HsOpApp operator applications
--- - HsOverLit overloaded literals
-- These constructors are the union of
-- - ones taken apart by GHC.Tc.Gen.Head.splitHsApps
-- - ones understood by GHC.Tc.Gen.Head.tcInferAppHead_maybe
-- See Note [Application chains and heads] in GHC.Tc.Gen.App
-- Se Note [Typechecking by expansion: overview]
-tcExpr e@(HsVar _ v_rn) res_ty
- = do { (v_tc, sigma_ty) <- tcInferId v_rn
- ; traceTc "tcExpr:HsVar" (ppr v_tc <+> dcolon <+> ppr sigma_ty $$ ppr res_ty)
- ; tcWrapResult e v_tc sigma_ty res_ty }
-
-tcExpr e@(ExprWithTySig _ e_rn e_ty) res_ty
- = do { (e_tc, sigma_ty) <- tcExprWithSig e_rn e_ty
- ; tcWrapResult e e_tc sigma_ty res_ty }
-
-tcExpr e@(XExpr(HsRecSelRn f)) res_ty
- = do { (e_tc, sigma_ty) <- tcInferRecSelId f
- ; tcWrapResult e e_tc sigma_ty res_ty }
-
-tcExpr (XExpr (ExpandedThingRn hse)) res_ty = tcHsExpansion hse res_ty
-
-tcExpr e@(HsApp {}) res_ty = tcApp e res_ty
-tcExpr e@(OpApp {}) res_ty = tcApp e res_ty
-tcExpr e@(HsAppType {}) res_ty = tcApp e res_ty
+tcExpr e@(HsApp {}) res_ty = tcApp e res_ty
+tcExpr e@(HsAppType {}) res_ty = tcApp e res_ty
+tcExpr e@(OpApp {}) res_ty = tcApp e res_ty
-- Typecheck an occurrence of an unbound Id
--
@@ -488,7 +484,8 @@ tcExpr expr@(ExplicitTuple x tup_args boxity) res_ty
; traceTc "ExplicitTuple" (ppr act_res_ty $$ ppr res_ty)
- ; tcWrapResultMono expr expr' act_res_ty res_ty }
+ ; co <- tcSubTypeMono expr act_res_ty res_ty
+ ; return (mkHsWrapCo co expr') }
tcExpr (ExplicitSum _ alt arity expr) res_ty
= do { let sum_tc = sumTyCon arity
@@ -682,8 +679,6 @@ tcExpr expr@(RecordCon { rcon_con = L loc qcon@(WithUserRdr _ con_name)
, rcon_con = L loc con_like
, rcon_flds = rbinds' }
- ; ret <- tcWrapResultMono expr expr' actual_res_ty res_ty
-
-- Check for missing fields. We do this after type-checking to get
-- better types in error messages (cf #18869). For example:
-- data T a = MkT { x :: a, y :: a }
@@ -694,7 +689,8 @@ tcExpr expr@(RecordCon { rcon_con = L loc qcon@(WithUserRdr _ con_name)
-- via a new `HoleSort`. But that seems too much work.
; checkMissingFields con_like rbinds arg_tys
- ; return ret }
+ ; co <- tcSubTypeMono expr actual_res_ty res_ty
+ ; return (mkHsWrapCo co expr') }
where
orig = OccurrenceOf con_name
@@ -721,14 +717,13 @@ tcExpr expr@(RecordUpd { rupd_expr = record_expr
-- NB: it's important to use ds_res_ty and not res_ty here.
-- Test case: T18802b.
- ; tcWrapResultMono expr expr' ds_res_ty res_ty
+ ; co <- tcSubTypeMono expr ds_res_ty res_ty
-- We need to unify the result type of the expanded
-- expression with the expected result type.
--
-- See Note [Unifying result types in tcRecordUpd].
-- Test case: T10808.
- }
- }
+ ; return (mkHsWrapCo co expr') } }
tcExpr e@(RecordUpd { rupd_flds = OverloadedRecUpdFields {}}) _
= pprPanic "tcExpr: unexpected overloaded-dot RecordUpd" $ ppr e
=====================================
compiler/GHC/Tc/Gen/Head.hs
=====================================
@@ -21,8 +21,6 @@ module GHC.Tc.Gen.Head
, pprArgInst, addFunResCtxt ) where
-import {-# SOURCE #-} GHC.Tc.Gen.Splice( getUntypedSpliceBody )
-
import GHC.Prelude
import GHC.Hs
import GHC.Hs.Syn.Type
@@ -63,7 +61,6 @@ import GHC.Builtin.Names
import GHC.Driver.DynFlags
import GHC.Utils.Misc
import GHC.Utils.Outputable as Outputable
-import GHC.Utils.Panic
{- *********************************************************************
@@ -765,10 +762,11 @@ nonBidirectionalErr = TcRnPatSynNotBidirectional
{- Note [Typechecking data constructors]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-As per Note [Polymorphisation of linear fields] in
-GHC.Core.Multiplicity, when we use a data constructor as a term, we want to
-consider its field to have polymorphic multiplicities. That is,
-Note [Data constructors are linear by default] says:
+As per Note [Polymorphisation of linear fields] in GHC.Core.Multiplicity,
+when we use a data constructor as a term, we want to consider its field to
+have polymorphic multiplicities.
+
+That is, Note [Data constructors are linear by default] says:
Just :: a. a %1 -> Maybe a
@@ -934,7 +932,8 @@ See Note [-fno-code mode].
* *
********************************************************************* -}
-addFunResCtxt :: HsExpr GhcTc -> [HsExprArg p]
+addFunResCtxt :: HasDebugCallStack
+ => HsExpr GhcTc -> [HsExprArg p]
-> TcType -> ExpRhoType
-> TcM a -> TcM a
-- When we have a mis-match in the return type of a function
@@ -942,33 +941,10 @@ addFunResCtxt :: HsExpr GhcTc -> [HsExprArg p]
-- But not in generated code, where we don't want
-- to mention internal (rebindable syntax) function names
addFunResCtxt fun args fun_res_ty env_ty thing_inside
- = do { env_tv <- newFlexiTyVarTy liftedTypeKind
- ; dumping <- doptM Opt_D_dump_tc_trace
- ; msg <- mk_msg dumping env_tv
- ; addErrCtxt msg thing_inside }
+ = addErrCtxt (FunResCtxt fun (count isValArg args) fun_res_ty env_ty) $
+ thing_inside
-- NB: use a landmark error context, so that an empty context
-- doesn't suppress some more useful context
- where
- mk_msg dumping env_tv
- = do { mb_env_ty <- readExpType_maybe env_ty
- -- by the time the message is rendered, the ExpType
- -- will be filled in (except if we're debugging)
- ; env' <- case mb_env_ty of
- Just env_ty -> return env_ty
- Nothing -> do { massert dumping; return env_tv }
- ; let -- See Note [Splitting nested sigma types in mismatched
- -- function types]
- (_, _, fun_tau) = tcSplitNestedSigmaTys fun_res_ty
- (_, _, env_tau) = tcSplitNestedSigmaTys env'
- -- env_ty is an ExpRhoTy, but with simple subsumption it
- -- is not deeply skolemised, so still use tcSplitNestedSigmaTys
- (args_fun, res_fun) = tcSplitFunTys fun_tau
- (args_env, res_env) = tcSplitFunTys env_tau
- info =
- FunResCtxt fun (count isValArg args) res_fun res_env
- (length args_fun) (length args_env)
- ; return info }
-
{-
Note [Splitting nested sigma types in mismatched function types]
=====================================
compiler/GHC/Tc/Types/ErrCtxt.hs
=====================================
@@ -251,7 +251,10 @@ data HsCtxt
-- | In the instance type signature of a class method.
| MethSigCtxt !Name !TcType !TcType
-- | In a pattern type signature.
+
| PatSigErrCtxt !TcType !ExpType
+ -- ExpType: see Note [ExpType in HsCtxt]
+
-- | In a pattern.
| PatCtxt !(Pat GhcRn)
-- | In a pattern synonym declaration.
@@ -268,7 +271,10 @@ data HsCtxt
-- | In a function call.
| FunTysCtxt !ExpectedFunTyCtxt !Type !Int !Int
-- | In the result of a function call.
- | FunResCtxt !(HsExpr GhcTc) !Int !Type !Type !Int !Int
+
+ | FunResCtxt !(HsExpr GhcTc) !Int !TcType !ExpType
+ -- ExpType: see Note [ExpType in HsCtxt]
+
-- | In the declaration of a type constructor.
| TyConDeclCtxt !Name !(TyConFlavour TyCon)
-- | In a type or data family instance (or default instance).
@@ -377,3 +383,14 @@ isHsCtxtLandmark (DerivBindCtxt{}) = True
isHsCtxtLandmark (FunResCtxt{}) = True
isHsCtxtLandmark (VDQWarningCtxt{}) = True
isHsCtxtLandmark _ = False
+
+{- Note [ExpType in HsCtxt]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+A couple of HsCtxt constructors have ExpTypes in them. When zonking the
+Infer{} case we read the hole, which should be filled in by now, and zonk
+that type. Now we want to put it back: we use (Check ty') for this, so that
+clients of a zonked HsCtxt don't need to be monadic.
+
+Result: after zonking, these ExpTypes are always (Check ty). It woudl be nice
+to guarantee this statically, but it's hard to do so.
+-}
=====================================
compiler/GHC/Tc/Utils/TcType.hs
=====================================
@@ -28,7 +28,7 @@ module GHC.Tc.Utils.TcType (
ExpType(..), ExpKind, InferResult(..), InferInstFlag(..), InferFRRFlag(..),
ExpTypeFRR, ExpSigmaType, ExpSigmaTypeFRR,
ExpRhoType, ExpRhoTypeFRR,
- mkCheckExpType,
+ mkCheckExpType, getCheckExpType,
checkingExpType_maybe, checkingExpType,
ExpPatType(..), mkCheckExpFunPatTy, mkInvisExpPatType,
@@ -492,6 +492,12 @@ instance Outputable InferResult where
mkCheckExpType :: TcType -> ExpType
mkCheckExpType = Check
+getCheckExpType :: HasDebugCallStack => ExpType -> TcType
+-- Expect a (Check ty).
+-- See Note [ExpType in HsCtxt] in GHC.Tc.Types.ErrCtxt
+getCheckExpType (Check ty) = ty
+getCheckExpType (Infer ir) = pprPanic "getCheckExpType" (ppr ir)
+
-- | Returns the expected type when in checking mode.
checkingExpType_maybe :: ExpType -> Maybe TcType
checkingExpType_maybe (Check ty) = Just ty
=====================================
compiler/GHC/Tc/Utils/Unify.hs
=====================================
@@ -10,10 +10,10 @@
-- | Type subsumption and unification
module GHC.Tc.Utils.Unify (
-- Full-blown subsumption
- tcWrapResult, tcWrapResultO, tcWrapResultMono,
- tcSubType, tcSubTypeSigma, tcSubTypePat, tcSubTypeDS, tcSubTypeHoleFit,
- addSubTypeCtxt,
- tcSubTypeAmbiguity, tcSubMult,
+ tcWrapResult, tcWrapResultO,
+ addSubTypeCtxt, tcCheckAppResult,
+ tcSubType, tcSubTypeSigma, tcSubTypePat, tcSubTypeHoleFit,
+ tcSubTypeAmbiguity, tcSubMult, tcSubTypeMono,
checkConstraints, checkTvConstraints,
buildImplicationFor, buildTvImplication, emitResidualTvConstraint,
@@ -99,13 +99,13 @@ import qualified GHC.LanguageExtensions as LangExt
import GHC.Builtin.Types
import GHC.Types.Name
-import GHC.Types.Id( idType, isDataConId )
+import GHC.Types.Id( idType )
import GHC.Types.Var as Var
import GHC.Types.Var.Set
import GHC.Types.Var.Env
import GHC.Types.Basic
import GHC.Types.Unique.Set (nonDetEltsUniqSet)
-import GHC.Types.SrcLoc (unLoc, GenLocated (..))
+import GHC.Types.SrcLoc( GenLocated(..) )
import GHC.Utils.Misc
import GHC.Utils.Outputable as Outputable
@@ -1169,7 +1169,7 @@ fillInferResultNoInst act_res_ty (IR { ir_uniq = u
; return final_co } }
-fillInferResult :: DeepSubsumptionFlag -> CtOrigin -> TcType -> InferResult -> TcM HsWrapper
+fillInferResult :: DeepSubsumptionFlag -> CtOrigin -> TcSigmaType -> InferResult -> TcM HsWrapper
-- See Note [Instantiation of InferResult]
fillInferResult ds_flag ct_orig res_ty ires@(IR { ir_inst = iif })
= case iif of
@@ -1425,18 +1425,29 @@ tcWrapResultO orig rn_expr expr actual_ty res_ty
; wrap <- tcSubType orig GenSigCtxt (Just $ HsExprRnThing rn_expr) actual_ty res_ty
; return (mkHsWrap wrap expr) }
--- | A version of 'tcWrapResult' to use when the actual type is a
--- rho-type, so nothing to instantiate; just go straight to unify.
--- It means we don't need to pass in a CtOrigin.
-tcWrapResultMono :: HasDebugCallStack
- => HsExpr GhcRn -> HsExpr GhcTc
- -> TcRhoType -- ^ Actual; a rho-type, not a sigma-type
- -> ExpRhoType -- ^ Expected
- -> TcM (HsExpr GhcTc)
-tcWrapResultMono rn_expr expr act_ty res_ty
- = do { co <- tcSubTypeMono rn_expr act_ty res_ty
- ; return (mkHsWrapCo co expr) }
+tcCheckAppResult :: HsExpr GhcRn -- The entire application (GhcRn)
+ -> HsExpr GhcTc -- Head of the application (GhcTc)
+ -> TcSigmaType -- Inferred type of the application; zonked to
+ -- expose foralls, but maybe not /deeply/ instantiated
+ -> ExpRhoType -- Expected type; this is deeply skolemised
+ -> TcM HsWrapper
+-- Unify with expected type from the context
+-- See Note [Unify with expected type before typechecking arguments]
+--
+-- Match up app_res_ty: the result type of rn_expr
+-- with res_ty: the expected result type
+tcCheckAppResult rn_expr tc_fun app_res_ty exp_ty
+ = do { ds_flag <- getDeepSubsumptionFlag_DataConHead tc_fun
+ ; traceTc "tcCheckResult" (ppr tc_fun $$ ppr ds_flag)
+ ; let origin = exprCtOrigin rn_expr
+ ; case exp_ty of
+ Infer inf_res -> fillInferResult ds_flag origin app_res_ty inf_res
+ Check res_ty -> tcSubTypeDS (Just tc_fun) ds_flag
+ (unifyExprType rn_expr)
+ origin GenSigCtxt
+ app_res_ty res_ty }
+------------------------
-- | A version of 'tcSubType' to use when the actual type is a rho-type,
-- so that no instantiation is needed.
tcSubTypeMono :: HasDebugCallStack
@@ -1460,37 +1471,17 @@ tcSubTypePat :: CtOrigin -> UserTypeCtxt
-- to tcSubType
-- If wrap = tc_sub_type_et t1 t2
-- => wrap :: t1 ~~> t2
-tcSubTypePat inst_orig ctxt (Check ty_actual) ty_expected
- = tc_sub_type unifyTypeET inst_orig ctxt ty_actual ty_expected
-
-tcSubTypePat _ _ (Infer inf_res) ty_expected
- = do { co <- fillInferResultNoInst ty_expected inf_res
- -- In patterns we do not instantatiate
-
- ; return (mkWpCastN (mkSymCo co)) }
-
----------------
+tcSubTypePat inst_orig ctxt exp_actual ty_expected
+ = do { ds_flag <- getDeepSubsumptionFlag
+ ; case exp_actual of
+ Infer inf_res -> do { co <- fillInferResultNoInst ty_expected inf_res
+ -- NoInst: in patterns we do not instantatiate
+ ; return (mkWpCastN (mkSymCo co)) }
--- | A subtype check that performs deep subsumption.
--- See also 'tcSubTypeMono', for when no instantiation is required.
-tcSubTypeDS :: HsExpr GhcTc -- ^ App head (for error messages only)
- -> DeepSubsumptionDepth
- -> HsExpr GhcRn
- -> TcRhoType -- ^ Actual type; a rho-type, not a sigma-type
- -> TcRhoType -- ^ Expected type
- -- DeepSubsumption <=> when checking, this type
- -- is deeply skolemised
- -> TcM HsWrapper
--- Only one call site, in GHC.Tc.Gen.App.checkResultTy
-tcSubTypeDS tc_fun ds_depth rn_expr act_rho exp_rho
- = do { wrap <- tc_sub_type_deep (Just tc_fun, Top) ds_depth
- (unifyExprType rn_expr)
- (exprCtOrigin rn_expr)
- GenSigCtxt act_rho exp_rho
- ; return (mkWpSubType wrap) }
+ Check ty_actual -> tcSubTypeDS Nothing ds_flag unifyTypeET
+ inst_orig ctxt ty_actual ty_expected }
---------------
-
-- | Checks that the 'actual' type is more polymorphic than the 'expected' type.
tcSubType :: CtOrigin -- ^ Used when instantiating
-> UserTypeCtxt -- ^ Used when skolemising
@@ -1499,13 +1490,12 @@ tcSubType :: CtOrigin -- ^ Used when instantiating
-> ExpRhoType -- ^ Expected type
-> TcM HsWrapper
tcSubType inst_orig ctxt m_thing ty_actual res_ty
- = case res_ty of
- Check ty_expected -> tc_sub_type (unifyType m_thing) inst_orig ctxt
- ty_actual ty_expected
+ = do { ds_flag <- getDeepSubsumptionFlag
+ ; case res_ty of
+ Infer inf_res -> fillInferResult ds_flag inst_orig ty_actual inf_res
+ Check ty_expected -> tcSubTypeDS Nothing ds_flag (unifyType m_thing)
+ inst_orig ctxt ty_actual ty_expected }
- Infer inf_res ->
- do { ds_flag <- getDeepSubsumptionFlag
- ; fillInferResult ds_flag inst_orig ty_actual inf_res }
---------------
tcSubTypeSigma :: CtOrigin -- where did the actual type arise / why are we
@@ -1516,24 +1506,26 @@ tcSubTypeSigma :: CtOrigin -- where did the actual type arise / why are we
-- Checks that actual <= expected
-- Returns HsWrapper :: actual ~~> expected
tcSubTypeSigma orig ctxt ty_actual ty_expected
- = tc_sub_type (unifyType Nothing) orig ctxt ty_actual ty_expected
+ = do { ds_flag <- getDeepSubsumptionFlag
+ ; tcSubTypeDS Nothing ds_flag (unifyType Nothing)
+ orig ctxt ty_actual ty_expected }
tcSubTypeHoleFit :: DeepSubsumptionFlag
-> CtOrigin
-> TcSigmaType -- ^ Candidate expression type
-> TcSigmaType -- ^ Expected type (= hole type)
-> TcM HsWrapper
-tcSubTypeHoleFit ds_flag orig cand_ty hole_ty =
+tcSubTypeHoleFit ds_flag orig cand_ty hole_ty
-- See Note [Deep subsumption in tcCheckHoleFit]
- tc_sub_type_ds (Nothing, Top) ds_flag (unifyType Nothing)
- orig (ExprSigCtxt NoRRC) cand_ty hole_ty
+ = tcSubTypeDS Nothing ds_flag (unifyType Nothing)
+ orig (ExprSigCtxt NoRRC) cand_ty hole_ty
---------------
tcSubTypeAmbiguity :: UserTypeCtxt -- Where did this type arise
-> TcSigmaType -> TcSigmaType -> TcM HsWrapper
-- See Note [Ambiguity check and deep subsumption]
tcSubTypeAmbiguity ctxt ty_actual ty_expected
- = tc_sub_type_ds (Nothing, Top)
+ = tcSubTypeDS Nothing
Shallow
(unifyType Nothing)
(AmbiguityCheckOrigin ctxt)
@@ -1550,25 +1542,19 @@ addSubTypeCtxt ty_actual ty_expected thing_inside
addErrCtxt (SubTypeCtxt ty_expected ty_actual) $
thing_inside
----------------
-tc_sub_type :: (TcType -> TcType -> TcM TcCoercionN) -- How to unify
- -> CtOrigin -- Used when instantiating
- -> UserTypeCtxt -- Used when skolemising
- -> TcSigmaType -- Actual; a sigma-type
- -> TcSigmaType -- Expected; also a sigma-type
- -> TcM HsWrapper
--- Checks that actual_ty is more polymorphic than expected_ty
--- If wrap = tc_sub_type t1 t2
--- => wrap :: t1 ~~> t2
---
--- The "how to unify argument" is always a call to `uType TypeLevel orig`,
--- but with different ways of constructing the CtOrigin `orig` from
--- the argument types and context.
-
----------------------
-tc_sub_type unify inst_orig ctxt ty_actual ty_expected
- = do { ds_flag <- getDeepSubsumptionFlag
- ; wrap <- tc_sub_type_ds (Nothing, Top) ds_flag unify inst_orig ctxt ty_actual ty_expected
+tcSubTypeDS :: Maybe (HsExpr GhcTc)
+ -- ^ app head, and position in its type (for error messages only)
+ -> DeepSubsumptionFlag
+ -> (TcType -> TcType -> TcM TcCoercionN)
+ -> CtOrigin -> UserTypeCtxt -> TcSigmaType
+ -> TcSigmaType -> TcM HsWrapper
+-- tcSubTypeDS is the main subsumption worker function
+-- It takes an explicit DeepSubsumptionFlag
+-- It adds the WpSubType tag; see Note [Deep subsumption and WpSubType]
+tcSubTypeDS tc_fun ds_flag unify inst_orig ctxt ty_actual ty_expected
+ = do { wrap <- tc_sub_type_ds (tc_fun, Top) ds_flag unify
+ inst_orig ctxt ty_actual ty_expected
; return (mkWpSubType wrap) }
----------------------
@@ -1578,8 +1564,6 @@ tc_sub_type_ds :: (Maybe (HsExpr GhcTc), Position p)
-> (TcType -> TcType -> TcM TcCoercionN)
-> CtOrigin -> UserTypeCtxt -> TcSigmaType
-> TcSigmaType -> TcM HsWrapper
--- tc_sub_type_ds is the main subsumption worker function
--- It takes an explicit DeepSubsumptionFlag
tc_sub_type_ds pos ds_flag unify inst_orig ctxt ty_actual ty_expected
| definitely_poly ty_expected -- See Note [Don't skolemise unnecessarily]
, isRhoTyDS ds_flag ty_actual
@@ -1764,8 +1748,8 @@ The effects are in these main places:
signatures (e.g. f :: ty; f = e), we must deeply skolemise the type;
see the call to tcDeeplySkolemise in tcSkolemiseScoped.
-4. In GHC.Tc.Gen.App.tcApp we call tcSubTypeDS to match the result
- type. Without deep subsumption, tcSubTypeMono would be sufficent.
+4. In GHC.Tc.Gen.App.tcApp we call tcCheckAppResult to check the result type
+ This does a deep subsumption check when necessary.
In all these cases note that the deep skolemisation must be done /first/.
Consider (1)
@@ -2046,8 +2030,8 @@ instance Outputable DeepSubsumptionFlag where
getDeepSubsumptionFlag :: TcM DeepSubsumptionFlag
getDeepSubsumptionFlag =
- do { ds <- xoptM LangExt.DeepSubsumption
- ; if ds
+ do { user_ds <- xoptM LangExt.DeepSubsumption
+ ; if user_ds
then return $ Deep DeepSub
else return Shallow
}
@@ -2055,38 +2039,19 @@ getDeepSubsumptionFlag =
-- | Variant of 'getDeepSubsumptionFlag' which enables a top-level subsumption
-- in order to implement the plan of Note [Typechecking data constructors].
getDeepSubsumptionFlag_DataConHead :: HsExpr GhcTc -> TcM DeepSubsumptionFlag
-getDeepSubsumptionFlag_DataConHead app_head =
- do { user_ds <- xoptM LangExt.DeepSubsumption
- ; traceTc "getDeepSubsumptionFlag_DataConHead" (ppr app_head)
- ; return $
- if | user_ds
- -> Deep DeepSub
- | otherwise
- -> go app_head
- }
+getDeepSubsumptionFlag_DataConHead app_head
+ = do { user_ds <- xoptM LangExt.DeepSubsumption
+ ; return $ if | user_ds -> Deep DeepSub
+ | dc_head app_head -> Deep TopSub
+ | otherwise -> Shallow }
where
- go :: HsExpr GhcTc -> DeepSubsumptionFlag
- go app_head
- | XExpr (ConLikeTc (RealDataCon {})) <- app_head
- = Deep TopSub
- | XExpr (ExpandedThingTc (HSE _ (L _ f))) <- app_head
- = go f
- | XExpr (WrapExpr _ f) <- app_head
- = go f
- | HsVar _ f <- app_head
- , isDataConId (unLoc f)
- = Deep TopSub
- | HsApp _ f _ <- app_head
- = go (unLoc f)
- | HsAppType _ f _ <- app_head
- = go (unLoc f)
- | OpApp _ _ f _ <- app_head
- = go (unLoc f)
- | HsPar _ f <- app_head
- = go (unLoc f)
- | otherwise
- = Shallow
-
+ dc_head (XExpr (ConLikeTc (RealDataCon {}))) = True
+ dc_head (XExpr (WrapExpr _ f)) = dc_head f
+ dc_head (HsApp _ (L _ f) _) = dc_head f
+ dc_head (HsAppType _ (L _ f) _) = dc_head f
+ dc_head (OpApp _ _ (L _ f) _) = dc_head f
+ dc_head (HsPar _ (L _ f)) = dc_head f
+ dc_head _ = False
-- | 'tc_sub_type_deep' is where the actual work happens for deep subsumption.
--
@@ -2347,7 +2312,8 @@ deeplyInstantiate :: CtOrigin -> TcType -> TcM (HsWrapper, Type)
-- Instantiate invisible foralls, even ones nested
-- (to the right) under arrows
deeplyInstantiate orig ty
- = go init_subst ty
+ = traceTc "deeplyInstantiate" (ppr ty) >>
+ go init_subst ty
where
init_subst = mkEmptySubst (mkInScopeSet (tyCoVarsOfType ty))
@@ -2356,10 +2322,10 @@ deeplyInstantiate orig ty
= do { let tvs = binderVars bndrs
-- As per Note [Multiplicity in deep subsumption],
-- we treat (a %1 -> b) as if it were forall m. a %m -> b.
- ; arg_tys <- traverse oneToMeta arg_tys
; (subst', tvs') <- newMetaTyVarsX subst tvs
; let arg_tys' = substScaledTys subst' arg_tys
theta' = substTheta subst' theta
+ ; arg_tys' <- traverse oneToMeta arg_tys'
; ids1 <- newSysLocalIds (fsLit "di") arg_tys'
; wrap1 <- instCall orig (mkTyVarTys tvs') theta'
; (wrap2, rho2) <- go subst' rho
@@ -2371,10 +2337,9 @@ deeplyInstantiate orig ty
; return (idHsWrapper, ty') }
oneToMeta :: Scaled TcType -> TcM (Scaled TcType)
- oneToMeta (Scaled OneTy ty)
- = do { mu <- newMultiplicityVar
- ; return $ Scaled mu ty }
- oneToMeta ty = return ty
+ oneToMeta (Scaled OneTy ty) = do { mu <- newMultiplicityVar
+ ; return $ Scaled mu ty }
+ oneToMeta ty = return ty
tcDeepSplitSigmaTy_maybe
=====================================
compiler/GHC/Tc/Zonk/TcType.hs
=====================================
@@ -818,19 +818,26 @@ zonkTidyHsCtxt env e@(FunAppCtxt{}) = return (env, e)
zonkTidyHsCtxt env (FunTysCtxt ctxt ty i1 i2) = do
(env', ty') <- zonkTidyTcType env ty
return $ (env', FunTysCtxt ctxt ty' i1 i2)
-zonkTidyHsCtxt env (FunResCtxt e i1 ty1 ty2 i2 i3) = do
- (env', ty1') <- zonkTidyTcType env ty1
- (env', ty2') <- zonkTidyTcType env' ty2
- return $ (env', FunResCtxt e i1 ty1' ty2' i2 i3)
+zonkTidyHsCtxt env (FunResCtxt e n ty1 env_ty) = do
+ (env', ty1') <- zonkTidyTcType env ty1
+ (env', env_ty') <- zonkExpType env' env_ty
+ return $ (env', FunResCtxt e n ty1' env_ty')
zonkTidyHsCtxt env (PatSigErrCtxt sig_ty res_ty) = do
(env', sig_ty') <- zonkTidyTcType env sig_ty
- (env', res_ty') <-
- case res_ty of
- Check ty -> zonkTidyTcType env' ty
- Infer (IR {ir_ref = ref}) -> do -- inlining readExpTyp_maybe to avoid module dep loops
- mb_ty <- liftIO $ readIORef ref
- case mb_ty of
- Nothing -> error "zonkTidyHsCtxt PatSigErrCtxt"
- Just ty -> zonkTidyTcType env' ty
- return (env', PatSigErrCtxt sig_ty' (Check res_ty'))
+ (env', res_ty') <- zonkExpType env' res_ty
+ return (env', PatSigErrCtxt sig_ty' res_ty')
zonkTidyHsCtxt env p = return (env, p)
+
+zonkExpType :: TidyEnv -> ExpType -> ZonkM (TidyEnv, ExpType)
+-- Zonk Infer{} to Check. The hole should have been filled in by now
+zonkExpType env (Check ty)
+ = do { (env', ty') <- zonkTidyTcType env ty
+ ; return (env', Check ty') }
+zonkExpType env (Infer ir@(IR { ir_ref = ref }))
+ = do { -- inlining readExpTyp_maybe to avoid module dep loops
+ ; mb_ty <- liftIO $ readIORef ref
+ ; case mb_ty of
+ Nothing -> pprPanic "zonkTidyHsCtxt PatSigErrCtxt" (ppr ir)
+ Just ty -> do { (env', ty') <- zonkTidyTcType env ty
+ ; return (env', Check ty') } }
+
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/a5163a8749ec29dc38403674de5f583…
--
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/a5163a8749ec29dc38403674de5f583…
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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 10 commits: Fix assert in Interpreter.c
by Marge Bot (＠marge-bot) 26 Mar '26
by Marge Bot (＠marge-bot) 26 Mar '26
26 Mar '26
Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC
Commits:
611e8905 by Luite Stegeman at 2026-03-26T18:57:13-04:00
Fix assert in Interpreter.c
If we skip exactly the number of words on the stack we end up on
the first word in the next chunk.
- - - - -
2ad7106c by Luite Stegeman at 2026-03-26T18:57:13-04:00
Support arbitrary size unboxed tuples in bytecode
This stores the size (number of words on the stack) of the next
expected tuple in the TSO, ctoi_spill_size field, eliminating
the need of stg_ctoi_tN frames for each size.
Note: On 32 bit platform there is still a bytecode tuple size
limit of 255 words on the stack.
Fixes #26946
- - - - -
5a1ca2e9 by Luite Stegeman at 2026-03-26T18:57:13-04:00
Add specialized frames for small tuples
Small tuples are now returned more efficiently to the interpreter.
They use one less word of stack space and don't need manipulation
of the TSO anymore.
- - - - -
b6c6191a by VeryMilkyJoe at 2026-03-26T18:57:15-04:00
Remove backwards compatibility pattern synonym `ModLocation`
Fixes #24932
- - - - -
72e2fb85 by Vladislav Zavialov at 2026-03-26T18:57:16-04:00
Extend HsExpr with the StarIsType syntax (#26587, #26967)
This patch allows kinds of the form `k -> *` and `* -> k` to occur in
expression syntax, i.e. to be used as required type arguments.
For example:
{-# LANGUAGE RequiredTypeArguments, StarIsType #-}
x1 = f (* -> * -> *)
x2 = f (forall k. k -> *)
x3 = f ((* -> *) -> Constraint)
Summary of the changes:
* Introduce the HsStar constructor of HsExpr and its extension field XStar.
It is analogous to HsStarTy in HsType.
* Refactor HsStarTy to store the unicode flag as TokStar, defined as
type TokStar = EpUniToken "*" "★" -- similar to TokForall, TokRArrow, etc.
The token is stored in the extension field and replaces the Bool field.
* Extend the `infixexp2` nonterminal to parse `*` as a direct argument of `->`.
This is more limited than the full StarIsType syntax, but has the nice
property of not conflicting with the multiplication operator `a * b`.
Test case: T26967 T26967_tyop
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04f92e93 by Sylvain Henry at 2026-03-26T18:57:24-04:00
STM: don't create a transaction in the rhs of catchRetry# (#26028)
We don't need to create a transaction for the rhs of (catchRetry#)
because contrary to the lhs we don't need to abort it on retry. Moreover
it is particularly harmful if we have code such as (#26028):
let cN = readTVar vN >> retry
tree = c1 `orElse` (c2 `orElse` (c3 `orElse` ...))
atomically tree
Because it will stack transactions for the rhss and the read-sets of all
the transactions will be iteratively merged in O(n^2) after the
execution of the most nested retry.
This is the second attempt at implementing this. The first attempt
triggered segfaults (#26291) and has been reverted.
Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com>
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352dece9 by Luite Stegeman at 2026-03-26T18:57:29-04:00
Windows: remove StgAsyncIOResult and fix crash/leaks
In stg_block_async{_void}, a stack slot was reserved for
an StgAsyncIOResult. This slot would be filled by the IO
manager upon completion of the async call.
However, if the blocked thread was interrupted by an async
exception, we would end up in an invalid state:
- If the blocked computation was never re-entered, the
StgAsyncIOResult would never be freed.
- If the blocked computation was re-entered, the thread would
find an unitialized stack slot for the StgAsyncIOResult,
leading to a crash reading its fields, or freeing the pointer.
We fix this by removing the StgAsyncIOResult altogether and writing
the result directly to the stack.
Fixes #26341
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741eff39 by Luite Stegeman at 2026-03-26T18:57:35-04:00
Don't refine DEFAULT alt for unary typeclasses
A non-DEFAULT data alt for a unary typeclass dictionary would
interfere with Unary Class Magic, leading to segfaults.
fixes #27071
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022a40cd by sheaf at 2026-03-26T18:57:41-04:00
Fix several oversights in hsExprType
This commit fixes several oversights in GHC.Hs.Syn.Type.hsExprType:
- The 'RecordCon' case was returning the type of the constructor,
instead of the constructor application. This is fixed by using
'splitFunTys'.
- The 'ExplicitTuple' case failed to take into account tuple sections,
and was also incorrectly handling 1-tuples (e.g. 'Solo') which can
be constructed using Template Haskell.
- The 'NegApp' case was returning the type of the negation operator,
again failing to apply it to the argument. Fixed by using
'funResultTy'.
- The 'HsProc' case was computing the result type of the arrow proc
block, without taking into account the argument type. Fix that by
adding a new field to 'CmdTopTc' that stores the arrow type, so that
we can construct the correct result type `arr a b` for
`proc (pat :: a) -> (cmd :: b)`.
- The 'ArithSeq' and 'NegApp' cases were failing to take into account
the result 'HsWrapper', which could e.g. silently drop casts.
This is fixed by introducing 'syntaxExpr_wrappedFunResTy' which, on
top of taking the result type, applies the result 'HsWrapper'.
These fixes are validated by the new GHC API test T26910.
Fixes #26910
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137afcef by Hai at 2026-03-26T18:57:55-04:00
Parser.y: avoid looking at token with QualifiedDo
This changes the behavior of 'hintQualifiedDo' so that the supplied
token is not inspected when the QualifiedDo language extension bit is
set.
- - - - -
101 changed files:
- compiler/GHC.hs
- compiler/GHC/ByteCode/Asm.hs
- compiler/GHC/ByteCode/Instr.hs
- compiler/GHC/ByteCode/Types.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToStg/AddImplicitBinds.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/Syn/Type.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/HsToCore/Arrows.hs
- compiler/GHC/HsToCore/Expr.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Type.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Annotation.hs
- compiler/GHC/Parser/Errors/Types.hs
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/HsType.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/StgToByteCode.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Arrow.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Types/Origin.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/Unit/Module/Location.hs
- compiler/GHC/Utils/Outputable.hs
- compiler/Language/Haskell/Syntax/Expr.hs
- compiler/Language/Haskell/Syntax/Extension.hs
- compiler/Language/Haskell/Syntax/Type.hs
- docs/users_guide/exts/required_type_arguments.rst
- rts/Apply.cmm
- rts/Continuation.c
- rts/ContinuationOps.cmm
- rts/HeapStackCheck.cmm
- rts/IOManager.c
- rts/Interpreter.c
- rts/PrimOps.cmm
- rts/Printer.c
- rts/RaiseAsync.c
- rts/RtsSymbols.c
- rts/STM.c
- rts/STM.h
- rts/Schedule.c
- rts/StgMiscClosures.cmm
- rts/Threads.c
- rts/Threads.h
- rts/include/rts/Bytecodes.h
- rts/include/rts/storage/TSO.h
- rts/include/stg/MiscClosures.h
- rts/win32/AsyncMIO.c
- rts/win32/AsyncMIO.h
- + testsuite/tests/bytecode/tuplestress/ByteCode.hs
- + testsuite/tests/bytecode/tuplestress/Common.hs-incl
- + testsuite/tests/bytecode/tuplestress/Obj.hs
- + testsuite/tests/bytecode/tuplestress/TupleStress.hs
- + testsuite/tests/bytecode/tuplestress/TupleStress.stdout
- + testsuite/tests/bytecode/tuplestress/all.T
- + testsuite/tests/concurrent/should_run/T26341.hs
- + testsuite/tests/concurrent/should_run/T26341.stdout
- + testsuite/tests/concurrent/should_run/T26341a.hs
- + testsuite/tests/concurrent/should_run/T26341a.stdout
- + testsuite/tests/concurrent/should_run/T26341b.hs
- + testsuite/tests/concurrent/should_run/T26341b.stdout
- testsuite/tests/concurrent/should_run/all.T
- + testsuite/tests/ghc-api/T26910.hs
- + testsuite/tests/ghc-api/T26910.stdout
- + testsuite/tests/ghc-api/T26910_Input.hs
- testsuite/tests/ghc-api/all.T
- testsuite/tests/ghc-api/fixed-nodes/FixedNodes.hs
- testsuite/tests/ghc-api/fixed-nodes/ModuleGraphInvariants.hs
- + testsuite/tests/lib/stm/T26028.hs
- + testsuite/tests/lib/stm/T26028.stdout
- + testsuite/tests/lib/stm/T26291a.hs
- + testsuite/tests/lib/stm/T26291a.stdout
- + testsuite/tests/lib/stm/T26291b.hs
- + testsuite/tests/lib/stm/T26291b.stdout
- + testsuite/tests/lib/stm/all.T
- + testsuite/tests/simplCore/should_run/T27071.hs
- + testsuite/tests/simplCore/should_run/T27071.stdout
- testsuite/tests/simplCore/should_run/all.T
- + testsuite/tests/vdq-rta/should_compile/T26967.hs
- + testsuite/tests/vdq-rta/should_compile/T26967.stderr
- + testsuite/tests/vdq-rta/should_compile/T26967_tyop.hs
- + testsuite/tests/vdq-rta/should_compile/T26967_tyop.stderr
- testsuite/tests/vdq-rta/should_compile/all.T
- utils/check-exact/ExactPrint.hs
- utils/deriveConstants/Main.hs
- utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
- utils/haddock/haddock-api/src/Haddock/Interface/RenameType.hs
The diff was not included because it is too large.
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26 Mar '26
Zubin pushed to branch ghc-9.12 at Glasgow Haskell Compiler / GHC
Commits:
09a55b19 by Cheng Shao at 2026-03-25T19:37:08+05:30
ci: bump ci-images revision
This commit bumps ci-images revisions on the ghc-9.12 branch to
https://gitlab.haskell.org/ghc/ci-images/-/commits/ghc-9.12-v4 with
ghc-wasm-meta toolchain fix.
(cherry picked from commit 65b68d22ee78b878346a00f8b8798465cfec4606)
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ed395c2d by Cheng Shao at 2026-03-25T19:37:17+05:30
wasm: fix broken dyld.mjs on upstream ghc-9.12 branch
This patch fixes broken `dyld.mjs` on upstream ghc-9.12 branch. Fixes #27079.
(cherry picked from commit fba0eca0022d115b0153b2238a28b9cc0d56c0ef)
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41600b5f by Sylvain Henry at 2026-03-25T19:37:38+05:30
JS: install rts/Types.h header file (#27033)
It was an omission, making HsFFI.h not usable with GHC using the JS
backend.
(cherry picked from commit 5b1be555be4f0989d78c274991c5046d7ac6d25e)
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44c6796f by Zubin Duggal at 2026-03-26T09:43:28+05:30
Prepare 9.12.4 final
Update hadrian bootstrap plans
Update autoconf scripts
Scripts taken from autoconf [a2287c3041a3f2a204eb942e09c015eab00dc7dd][1].
[1]: https://git.savannah.gnu.org/cgit/config.git/commit/?id=a2287c3041a3f2a204e…
- - - - -
37 changed files:
- .gitlab-ci.yml
- configure.ac
- hadrian/bootstrap/plan-9_10_1.json
- + hadrian/bootstrap/plan-9_10_2.json
- + hadrian/bootstrap/plan-9_10_3.json
- + hadrian/bootstrap/plan-9_12_2.json
- hadrian/bootstrap/plan-9_6_1.json
- hadrian/bootstrap/plan-9_6_2.json
- hadrian/bootstrap/plan-9_6_3.json
- hadrian/bootstrap/plan-9_6_4.json
- hadrian/bootstrap/plan-9_6_5.json
- hadrian/bootstrap/plan-9_6_6.json
- + hadrian/bootstrap/plan-9_6_7.json
- hadrian/bootstrap/plan-9_8_1.json
- hadrian/bootstrap/plan-9_8_2.json
- + hadrian/bootstrap/plan-9_8_4.json
- hadrian/bootstrap/plan-bootstrap-9_10_1.json
- + hadrian/bootstrap/plan-bootstrap-9_10_2.json
- + hadrian/bootstrap/plan-bootstrap-9_10_3.json
- + hadrian/bootstrap/plan-bootstrap-9_12_2.json
- hadrian/bootstrap/plan-bootstrap-9_6_1.json
- hadrian/bootstrap/plan-bootstrap-9_6_2.json
- hadrian/bootstrap/plan-bootstrap-9_6_3.json
- hadrian/bootstrap/plan-bootstrap-9_6_4.json
- hadrian/bootstrap/plan-bootstrap-9_6_5.json
- hadrian/bootstrap/plan-bootstrap-9_6_6.json
- + hadrian/bootstrap/plan-bootstrap-9_6_7.json
- hadrian/bootstrap/plan-bootstrap-9_8_1.json
- hadrian/bootstrap/plan-bootstrap-9_8_2.json
- + hadrian/bootstrap/plan-bootstrap-9_8_4.json
- rts/rts.cabal
- + testsuite/tests/javascript/js-c-sources/T27033.hs
- + testsuite/tests/javascript/js-c-sources/T27033.stdout
- + testsuite/tests/javascript/js-c-sources/T27033_c.c
- + testsuite/tests/javascript/js-c-sources/T27033_js.js
- testsuite/tests/javascript/js-c-sources/all.T
- utils/jsffi/dyld.mjs
The diff was not included because it is too large.
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/097556ce96a33f863edb4adcebd966…
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[Git][ghc/ghc][wip/int-index/tyop] 136 commits: Add SIMD absolute value on x86 and LLVM
by Vladislav Zavialov (＠int-index) 26 Mar '26
by Vladislav Zavialov (＠int-index) 26 Mar '26
26 Mar '26
Vladislav Zavialov pushed to branch wip/int-index/tyop at Glasgow Haskell Compiler / GHC
Commits:
476c4cdf by Sean D. Gillespie at 2026-03-02T10:14:37-05:00
Add SIMD absolute value on x86 and LLVM
On x86, absolute value of 32 bits or less is implemented with
PABSB/PABSW/PABSD if SSSE3 is available. Otherwise, there is a fallback
for SSE2. For 64 bit integers it uses VPABSQ, required by AVX-512VL,
with fallbacks for SSE4.2 and SSE2.
There is no dedicated instruction for floating point absolute value on
x86, so it is simulated using bitwise AND.
Absolute value for signed integers and floats are implemented by the
"llvm.abs/llvm.fabs" standard library intrinsics. This implementation
uses MachOps constructors, unlike non-vector floating point absolute
value, which uses CallishMachOps.
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709448c0 by Sean D. Gillespie at 2026-03-02T10:14:46-05:00
Add SIMD floating point square root
On x86, this is implemented with the SQRTPS and SQRTPD instructions. On
LLVM, it uses the sqrt library intrinstic.
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0deadf66 by Sean D. Gillespie at 2026-03-02T10:14:47-05:00
Improve error message for SIMD on aarch64
When encountering vector literals on aarch64, previously it would
throw:
<no location info>: error:
panic! (the 'impossible' happened)
GHC version 9.15.20251219:
getRegister' (CmmLit:CmmVec):
Now it is more consistent with the other vector operations:
<no location info>: error:
sorry! (unimplemented feature or known bug)
GHC version 9.15.20251219:
SIMD operations on AArch64 currently require the LLVM backend
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7d64031b by Vladislav Zavialov at 2026-03-03T11:09:28-05:00
Replace maybeAddSpace with spaceIfSingleQuote
Simplify pretty-printing of HsTypes by using spaceIfSingleQuote.
This allows us to drop the unwieldy lhsTypeHasLeadingPromotionQuote
helper function.
Follow-up to 178c1fd830c78377ef5d338406a41e1d8eb5f0da
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598db847 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Correct `hIsReadable` and `hIsWritable` for duplex handles
This contribution implements CLC proposal #371. It changes `hIsReadable`
and `hIsWritable` such that they always throw a respective exception
when encountering a closed or semi-closed handle, not just in the case
of a file handle.
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b90201e5 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Document `SemiClosedHandle`
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c9df72b5 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Tell users what “semi-closed” means for duplex handles
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a8aa1868 by Ilias Tsitsimpis at 2026-03-06T06:26:29-05:00
Fix determinism of linker arguments
The switch from Data.Map to UniqMap in 3b5be05ac29 introduced
non-determinism in the order of packages passed to the linker.
This resulted in non-reproducible builds where the DT_NEEDED entries in
dynamic libraries were ordered differently across builds.
Fix the regression by explicitly sorting the package list derived from
UniqMap.
Fixes #26838
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9b64ad3a by Matthew Pickering at 2026-03-06T06:27:16-05:00
determinism: Use a deterministic renaming when writing bytecode files
Now when writing the bytecode file, a counter and substitution are used
to provide deterministic keys to local variables (rather than relying on
uniques). This change ensures that `.gbc` are produced
deterministically.
Fixes #26499
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d29800e0 by Teo Camarasu at 2026-03-06T06:28:46-05:00
ghc-internal: delete Version hs-boot loop
Version has a Read instance which needs Unicode but part of the Unicode interface is the unicode version. This is easy to resolve. We simply don't re-export the version from the Unicode module.
Resolves #26940
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ad25af90 by Sylvain Henry at 2026-03-06T06:30:33-05:00
Linker: implement support for COMMON symbols (#6107)
Add some support for COMMON symbols. We don't support common symbols
having different sizes where the larger one is allocated after the
smaller one. The linker will fail with an appropriate error message if
it happens.
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3b59f158 by Cheng Shao at 2026-03-06T06:31:16-05:00
compiler: fix redundant import of GHC.Hs.Lit
This patch removes a redundant import of `GHC.Hs.Lit` which causes a
ghc build failure with validate flavours when bootstrapping from 9.14.
Fixes #26972.
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148d36f3 by Cheng Shao at 2026-03-06T06:32:01-05:00
compiler: avoid unneeded traversals in GHC.Unit.State
Following !15591, this patch avoids unneeded traversals in
`reportCycles`/`reportUnusable` when log verbosity is below given
threshold. Also applies `logVerbAtLeast` when appropriate.
Co-authored-by: Codex <codex(a)openai.com>
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7e31367c by Cheng Shao at 2026-03-06T06:32:46-05:00
ghc-internal: fix redundant import in GHC.Internal.Event.Windows.ManagedThreadPool
This patch fixes redundant import in
`GHC.Internal.Event.Windows.ManagedThreadPool` that causes a
compilation error when building windows target with validate flavours
and bootstrapping from 9.14. Fixes #26976.
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fc8b8e27 by sheaf at 2026-03-06T06:33:28-05:00
System.Info.fullCompilerVersion: add 'since' annot
Fixes #26973
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c8238375 by Sylvain Henry at 2026-03-06T06:34:23-05:00
Hadrian: deprecate --bignum and automatically enable +native_bignum for JS
Deprecate --bignum=... to select the bignum backend. It's only used to
select the native backend, and this can be done with the +native_bignum
flavour transformer.
Additionally, we automatically enable +native_bignum for the JS target
because the GMP backend isn't supported.
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a3ac7074 by Sylvain Henry at 2026-03-06T06:35:17-05:00
JS: fix putEnum/fromEnum (#24593)
Don't go through Word16 when serializing Enums.
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0b36e96c by Andreas Klebinger at 2026-03-06T06:35:58-05:00
Docs: Document -fworker-wrapper-cbv default setting.
Fixes #26841
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eca445e7 by mangoiv at 2026-03-07T05:02:36-05:00
drop deb9/10 from CI, add deb13
debian 9 and 10 are end of life, hence we drop them
from our CI, but we do add debian 13. Jobs that were
previously run on 9 and 10 run on 13, too, jobs that
were run on 10, are run on 11 now. Jobs that were
previously run on debian 12 are run on debian 13 now.
This MR also updates hadrian's bootstrap plans for that
reason.
Metric Decrease:
T9872d
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12f8b829 by Luite Stegeman at 2026-03-07T05:03:33-05:00
Fix GHC.Internal.Prim haddock
Haddock used to parse Haskell source to generate documentation,
but switched to using interface files instead. This broke documentation
of the GHC.Internal.Prim module, since it's a wired-in interface that
didn't provide a document structure.
This patch adds the missing document structure and updates genprimopcode
to make the section headers and descriptions available.
fixes #26954
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f87e5e57 by Luite Stegeman at 2026-03-07T05:03:33-05:00
Remove obsolete --make-haskell-source from genprimopcode
Now that haddock uses the wired-in interface for GHC.Internal.Prim,
the generated Haskell source file is no longer needed. Remove the
--make-haskell-source code generator from genprimopcode and replace
the generated GHC/Internal/Prim.hs with a minimal static source file.
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4a7ddc7b by Sylvain Henry at 2026-03-07T05:04:59-05:00
JS: fix linking of exposed but non-preload units (#24886)
Units exposed in the unit database but not explicitly passed on the
command-line were not considered by the JS linker. This isn't an issue
for cabal which passes every unit explicitly but it is an issue when
using GHC directly (cf T24886 test).
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689aafcd by mangoiv at 2026-03-07T05:05:52-05:00
testsuite: double foundation timeout multiplier
The runtime timeout in the foundation test was regularly hit by code
generated by the wasm backend - we increase the timout since the high
runtime is expected on the wasm backend for this rather complex test.
Resolves #26938
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a46a1bb1 by Cheng Shao at 2026-03-09T04:50:30-04:00
compiler: add myCapabilityExpr to GHC.Cmm.Utils
This commit adds `myCapabilityExpr` to `GHC.Cmm.Utils` which is
computed from `BaseReg`. It's convenient for codegen logic where one
needs to pass the current Capability's pointer.
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4afc65b1 by Cheng Shao at 2026-03-09T04:50:30-04:00
compiler: lower tryPutMVar# into a ccall directly
This patch addresses an old TODO of `stg_tryPutMVarzh` by removing it
completely and making the compiler lower `tryPutMVar#` into a ccall to
`performTryPutMVar` directly, without landing into an intermediate C
or Cmm function. `performTryPutMVar` is promoted to a public RTS
function with default visibility, and the compiler lowering logic
takes into account the C ABI of `performTryPutMVar` and converts from
C Bool to primop's `Int#` result properly.
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9e3d6a58 by Simon Hengel at 2026-03-09T04:51:15-04:00
Don't use #line in haddocks
This confuses the parser. Haddock output is unaffected by this change.
(read: this still produces the same documentation)
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f4e8fec2 by Wolfgang Jeltsch at 2026-03-09T04:52:01-04:00
Remove in-package dependencies on `GHC.Internal.System.IO`
This contribution eliminates all dependencies on
`GHC.Internal.System.IO` from within `ghc-internal`. It comprises the
following changes:
* Make `GHC.Internal.Fingerprint` independent of I/O support
* Tighten the dependencies of `GHC.Internal.Data.Version`
* Tighten the dependencies of `GHC.Internal.TH.Monad`
* Tighten the dependencies of `GHCi.Helpers`
* Move some code that needs `System.IO` to `template-haskell`
* Move the `GHC.ResponseFile` implementation into `base`
* Move the `System.Exit` implementation into `base`
* Move the `System.IO.OS` implementation into `base`
Metric Decrease:
size_hello_artifact
size_hello_artifact_gzip
size_hello_unicode
size_hello_unicode_gzip
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91df4c82 by Sylvain Henry at 2026-03-09T04:53:20-04:00
T18832: fix Windows CI failure by dropping removeDirectoryRecursive
On Windows, open file handles prevent deletion. After killThread, the
closer thread may not have called hClose yet, causing removeDirectoryRecursive
to fail with "permission denied". The test harness cleans up the run
directory anyway, so the call is redundant.
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d7fe9671 by Cheng Shao at 2026-03-09T04:54:04-04:00
compiler: fix redundant import in GHC.StgToJS.Object
This patch fixes a redundant import in GHC.StgToJS.Object that causes
a build failure when compiling head from 9.14 with validate flavours.
Fixes #26991.
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0bfd29c3 by Cheng Shao at 2026-03-09T04:54:46-04:00
wasm: fix `Illegal foreign declaration` failure when ghci loads modules with JSFFI exports
This patch fixes a wasm ghci error when loading modules with JSFFI
exports; the `backendValidityOfCExport` check in `tcCheckFEType`
should only makes sense and should be performed when not checking the
JavaScript calling convention; otherwise, when the calling convention
is JavaScript, the codegen logic should be trusted to backends that
actually make use of it. Fixes #26998.
- - - - -
e659610c by Duncan Coutts at 2026-03-09T12:08:35-04:00
Apply NOINLINE pragmas to generated Typeable bindings
For context, see the existing Note [Grand plan for Typeable]
and the Note [NOINLINE on generated Typeable bindings] added in the
subsequent commit.
This is about reducing the number of exported top level names and
unfoldings, which reduces interface file sizes and reduces the number of
global/dynamic linker symbols.
Also accept the changed test output and metric decreases.
Tests that record the phase output for type checking or for simplifier
end up with different output: the generated bindings now have an
Inline [~] annotation, and many top level names are now local rather
than module-prefixed for export.
Also accept the numerous metric decreases in compile_time/bytes
allocated, and a few in compile_time/max_bytes_used.
There's also one instance of a decrease in runtime/max_bytes_used but
it's a ghci-way test and so presumably the reason is that it loads
smaller .hi files and/or links fewer symbols.
-------------------------
Metric Decrease:
CoOpt_Singletons
MultiLayerModulesTH_OneShot
MultilineStringsPerf
T10421
T10547
T12150
T12227
T12234
T12425
T13035
T13056
T13253
T13253-spj
T15304
T15703
T16875
T17836b
T17977b
T18140
T18223
T18282
T18304
T18698a
T18698b
T18730
T18923
T20049
T21839c
T24471
T24582
T24984
T3064
T4029
T5030
T5642
T5837
T6048
T9020
T9198
T9961
TcPlugin_RewritePerf
WWRec
hard_hole_fits
mhu-perf
-------------------------
- - - - -
67df5161 by Duncan Coutts at 2026-03-09T12:08:35-04:00
Add documentation Note [NOINLINE on generated Typeable bindings]
and refer to it from the code and existing documentation.
- - - - -
c4ad6167 by Duncan Coutts at 2026-03-09T12:08:35-04:00
Switch existing note to "named wrinkle" style, (GPT1)..(GPT7)
GPT = Grand plan for Typeable
- - - - -
dc84f8e2 by Cheng Shao at 2026-03-09T12:09:21-04:00
ci: only build deb13 for validate pipeline aarch64-linux jobs
This patch drops the redundant aarch64-linux deb12 job from validate pipelines
and only keeps deb13; it's still built in nightly/release pipelines. Closes #27004.
- - - - -
23a50772 by Rajkumar Natarajan at 2026-03-10T14:11:37-04:00
chore: Merge GHC.Internal.TH.Quote into GHC.Internal.TH.Monad
Move the QuasiQuoter datatype from GHC.Internal.TH.Quote to
GHC.Internal.TH.Monad and delete the Quote module.
Update submodule template-haskell-quasiquoter to use the merged
upstream version that imports from the correct module.
Co-authored-by: Cursor <cursoragent(a)cursor.com>
- - - - -
a2bb6fc3 by Simon Jakobi at 2026-03-10T14:12:23-04:00
Add regression test for #16122
- - - - -
604e1180 by Cheng Shao at 2026-03-11T15:00:42-04:00
hadrian: remove the broken bench flavour
This patch removes the bench flavour from hadrian which has been
broken for years and not used for actual benchmarking (for which
`perf`/`release` is used instead). Closes #26825.
- - - - -
c3e64915 by Simon Jakobi at 2026-03-11T15:01:31-04:00
Add regression test for #18186
The original TypeInType language extension is replaced with
DataKinds+PolyKinds for compatibility.
Closes #18186.
- - - - -
664996c7 by Andreas Klebinger at 2026-03-11T15:02:16-04:00
Bump nofib submodule.
We accrued a number of nofib fixes we want to have here.
- - - - -
517cf64e by Simon Jakobi at 2026-03-11T15:03:03-04:00
Add regression test for #15907
Closes #15907.
- - - - -
fff362cf by Simon Jakobi at 2026-03-11T15:03:49-04:00
Ensure T14272 is run in optasm way
Closes #16539.
- - - - -
ec81ec2c by Simon Jakobi at 2026-03-11T15:03:49-04:00
Add regression test for #24632
Closes #24632.
- - - - -
cefec47b by Simon Jakobi at 2026-03-11T15:03:50-04:00
Fix module name of T9675: T6975 -> T9675
- - - - -
d3690ae8 by Andreas Klebinger at 2026-03-11T15:04:31-04:00
User guide: Clarify phase control on INLINEABLE[foo] pragmas.
Fixes #26851
- - - - -
e7054934 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #12694
Closes #12694.
- - - - -
4756d9f6 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #16275
Closes #16275.
- - - - -
34b7e2c1 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #14908
Closes #14908.
- - - - -
4243db3d by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #14151
Closes #14151.
- - - - -
0e9f1453 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #12640
Closes #12640.
- - - - -
ae606c7f by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #15588
Closes #15588.
- - - - -
5a38ce4e by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #9445
Closes #9445.
- - - - -
d054b467 by Cheng Shao at 2026-03-11T15:05:59-04:00
compiler: implement string interning logic for BCONPtrFS
This patch adds a `FastStringEnv`-based cache of `MallocStrings`
requests to `Interp`, so that when we load bytecode with many
breakpoints that share the same module names & unit ids, we reuse the
allocated remote pointers instead of issuing duplicte `MallocStrings`
requests and bloating the C heap. Closes #26995.
- - - - -
b85a0293 by Simon Jakobi at 2026-03-11T15:06:41-04:00
Add perf test for #1216
Closes #1216.
- - - - -
cd7f7420 by Sylvain Henry at 2026-03-11T15:07:58-04:00
JS: check that tuple constructors are linked (#23709)
Test js-mk_tup was failing before because tuple constructors weren't
linked in. It's no longer an issue after the linker fixes.
- - - - -
d57f01a4 by Matthew Pickering at 2026-03-11T15:08:40-04:00
testsuite: Add test for foreign import prim with unboxed tuple return
This commit just adds a test that foreign import prim works with unboxed
sums.
- - - - -
23d111ce by Matthew Pickering at 2026-03-11T15:08:41-04:00
Return a valid pointer in advanceStackFrameLocationzh
When there is no next stack chunk, `advanceStackFrameLocationzh` used to
return NULL in the pointer-typed StackSnapshot# result slot.
Even though the caller treats that case as "no next frame", the result is
still materialized in a GC-visible pointer slot. If a GC observes the raw
NULL there, stack decoding can crash.
Fix this by ensuring the dead pointer slot contains a valid closure
pointer. Also make the optional result explicit by returning an unboxed
sum instead of a tuple with a separate tag.
Fixes #27009
- - - - -
4c58a3ae by Cheng Shao at 2026-03-11T15:09:22-04:00
hadrian: build profiled dynamic objects with -dynamic-too
This patch enables hadrian to build profiled dynamic objects with
`-dynamic-too`, addressing a build parallelism bottleneck in release
pipelines. Closes #27010.
- - - - -
870243e4 by Zubin Duggal at 2026-03-12T17:33:28+05:30
DmdAnal: Take stable unfoldings into account when determining argument demands
Previously, demand analysis only looked at the RHS to compute argument demands.
If the optimised RHS discarded uses of an argument that the stable unfolding
still needed, it would be incorrectly marked absent. Worker/wrapper would then
replace it with LitRubbish, and inlining the stable unfolding would use the
rubbish value, causing a segfault.
To fix, we introduce addUnfoldingDemands which analyses the stable unfolding
with dmdAnal and combines its DmdType with the RHS's via the new `maxDmdType`
which combines the demands of the stable unfolding with the rhs, so we can avoid
any situation where we give an absent demand to something which is still used
by the stable unfolding.
Fixes #26416.
- - - - -
669d09f9 by Cheng Shao at 2026-03-13T15:06:07-04:00
hadrian: remove redundant library/rts ways definitions from stock flavours
This patch removes redundant library/rts ways definitions from stock
flavours in hadrian; they can be replaced by applying appropriate
filters on `defaultFlavour`.
- - - - -
a27dc081 by Teo Camarasu at 2026-03-13T15:06:51-04:00
ghc-internal: move bits Weak of finalizer interface to base
We move parts of the Weak finalizer interface to `base` only the parts
that the RTS needs to know about are kept in `ghc-internal`.
This lets us then prune our imports somewhat and get rid of some SOURCE imports.
Resolves #26985
- - - - -
6eef855b by Sylvain Henry at 2026-03-13T15:08:18-04:00
Stg/Unarise: constant-folding during unarisation (#25650)
When building an unboxed sum from a literal argument, mkUbxSum
previously emitted a runtime cast via `case primop [lit] of var -> ...`.
This wrapper prevented GHC from recognising the result as a static
StgRhsCon, causing top-level closures to be allocated as thunks instead
of being statically allocated.
Fix: try to perform the numeric literal cast at compile time using
mkLitNumberWrap (wrapping semantics). If successful, return the cast
literal directly with an identity wrapper (no case expression). The
runtime cast path is kept as fallback for non-literal arguments.
Test: codeGen/should_compile/T25650
- - - - -
905f8723 by Simon Jakobi at 2026-03-13T15:09:09-04:00
Add regression test for #2057
Test that GHC stops after an interface-file error instead of
continuing into the linker.
The test constructs a stale package dependency on purpose. `pkgB` is compiled
against one version of package `A`, then the same unit id is replaced by an
incompatible build of `A`. When `Main` imports `B`, GHC has to read `B.hi`,
finds an unfolding that still mentions the old `A`, and should fail while
loading interfaces.
Closes #2057.
Assisted-by: Codex
- - - - -
a13245a9 by Sylvain Henry at 2026-03-13T15:10:06-04:00
JS: fix recompilation avoidance (#23013)
- we were checking the mtime of the *.jsexe directory, not of a file
- we were not computing the PkgsLoaded at all
- - - - -
07442653 by Cheng Shao at 2026-03-13T15:10:51-04:00
hadrian: bump index state & bootstrap plans
This patch bumps hadrian index state & bootstrap plans:
- The updated index state allows bootstrapping from 9.14 without cabal
allow-newer hacks
- The updated bootstrap plans all contain shake-0.19.9 containing
important bugfix, allowing a subsequent patch to bump shake bound to
ensure the bugfix is included
- ghc 9.14.1 bootstrap plan is added
- - - - -
fdc1dbad by Cheng Shao at 2026-03-13T15:10:51-04:00
ci: add ghc 9.14.1 to bootstrap matrix
This patch adds ghc 9.14.1 to bootstrap matrix, so that we test
bootstrapping from ghc 9.14.1.
- - - - -
91916079 by Sylvain Henry at 2026-03-13T15:11:43-04:00
T17912: wait for opener thread to block before killing it (#24739)
Instead of a fixed 1000ms delay, poll threadStatus until the opener
thread is in BlockedOnForeignCall, ensuring killThread only fires once
the thread is provably inside the blocking open() syscall. This prevents
the test from accidentally passing on Windows due to scheduling races.
- - - - -
baa4ebb4 by Cheng Shao at 2026-03-13T15:12:26-04:00
template-haskell: fix redundant import in Language.Haskell.TH.Quote
This patch fixes a redundant import in `Language.Haskell.TH.Quote`
that causes a ghc build failure when bootstrapping from 9.14 with
validate flavours. Fixes #27014.
- - - - -
02e68a86 by Brandon Simmons at 2026-03-13T15:13:19-04:00
Add a cumulative gc_sync_elapsed_ns counter to GHC.Internal.Stats
This makes it possible to get an accurate view of time spent in sync
phase when using prometheus-style sampling. Previously this was only
available for the most recent GC.
This intentionally leaves GHC.Stats API unchanged since it is marked as
deprecated, and API changes there require CLC approval.
Fixes #26944
- - - - -
a18fa3c1 by Cheng Shao at 2026-03-14T05:12:14-04:00
configure: make $LLVMAS default to $CC when $CcLlvmBackend is YES
This patch changes the $LLVMAS detection logic in configure so that
when it's not manually specified by the user, it defaults to $CC if
$CcLlvmBackend is YES. It's a more sensible default than auto-detected
clang from the environment, especially when cross-compiling, $CC as
the cross target's LLVM assembler is more compatible with the use case
than the system-wide clang. Fixes #26769.
- - - - -
3774086e by Matthew Pickering at 2026-03-14T05:13:00-04:00
exceptions: annotate onException continuation with WhileHandling
Before this patch, an exception thrown in the `onException` handler
would loose track of where the original exception was thrown.
```
import Control.Exception
main :: IO ()
main = failingAction `onException` failingCleanup
where
failingAction = throwIO (ErrorCall "outer failure")
failingCleanup = throwIO (ErrorCall "cleanup failure")
```
would report
```
T28399: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall:
cleanup failure
HasCallStack backtrace:
throwIO, called at T28399.hs:<line>:<column> in <package-id>:Main
```
notice that the "outer failure" exception is not present in the error
message.
With this patch, any exception thrown is in the handler is annotated
with WhileHandling. The resulting message looks like
```
T28399: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall:
cleanup failure
While handling outer failure
HasCallStack backtrace:
throwIO, called at T28399.hs:7:22 in main:Main
```
CLC Proposal: https://github.com/haskell/core-libraries-committee/issues/397
Fixes #26759
- - - - -
63ae8eb3 by Andreas Klebinger at 2026-03-14T05:13:43-04:00
Fix missing profiling header for origin_thunk frame.
Fixes #27007
- - - - -
213d2c0e by Cheng Shao at 2026-03-14T05:14:28-04:00
ci: fix ci-images revision
The current ci-images revision was a commit on the WIP branch of
https://gitlab.haskell.org/ghc/ci-images/-/merge_requests/183, and
it's not on the current ci-images master branch. This patch fixes the
image revision to use the current tip of ci-images master.
- - - - -
fc2b083f by Andreas Klebinger at 2026-03-14T05:15:14-04:00
Revert "hadrian/build-cabal: Better respect and utilize -j"
This reverts commit eab3dbba79650e6046efca79133b4c0a5257613d.
While it's neat this currently isn't well supported on all platforms.
It's time will come, but for now I'm reverting this to avoid issues for
users on slightly unconvential platforms.
This will be tracked at #26977.
- - - - -
12a706cf by Cheng Shao at 2026-03-14T16:37:54-04:00
base: fix redundant imports in GHC.Internal.Weak.Finalize
This patch fixes redundant imports in GHC.Internal.Weak.Finalize that
causes a regression in bootstrapping head from 9.14 with validate
flavours. Fixes #27026.
- - - - -
b5d39cad by Matthew Pickering at 2026-03-14T16:38:37-04:00
Use explicit syntax rather than pure
- - - - -
43638643 by Andreas Klebinger at 2026-03-15T18:15:48-04:00
Configure: Fix check for --target support in stage0 CC
The check FP_PROG_CC_LINKER_TARGET used $CC unconditionally to check for
--target support. However this fails for the stage0 config where the C
compiler used is not $CC but $CC_STAGE0.
Since we already pass the compiler under test into the macro I simply
changed it to use that instead.
Fixes #26999
- - - - -
18fd0df6 by Simon Hengel at 2026-03-15T18:16:33-04:00
Fix typo in recursive_do.rst
- - - - -
86bd9bfc by fendor at 2026-03-17T23:46:09-04:00
Introduce `-fimport-loaded-targets` GHCi flag
This new flag automatically adds all loaded targets to the GHCi session
by adding an `InteractiveImport` for the loaded targets.
By default, this flag is disabled, as it potentially increases memory-usage.
This interacts with the flag `-fno-load-initial-targets` as follows:
* If no module is loaded, no module is added as an interactive import.
* If a reload loads up to a module, all loaded modules are added as
interactive imports.
* Unloading modules removes them from the interactive context.
Fixes #26866 by rendering the use of a `-ghci-script` to achieve the
same thing redundant.
- - - - -
e3d4c1bb by mniip at 2026-03-17T23:47:03-04:00
ghc-internal: Remove GHC.Internal.Data.Eq
It served no purpose other than being a re-export.
- - - - -
6f4f6cf0 by mniip at 2026-03-17T23:47:03-04:00
ghc-internal: Refine GHC.Internal.Base imports
Removed re-exports from GHC.Internal.Base. This reveals some modules
that don't actually use anything *defined* in GHC.Internal.Base, and
that can be pushed down a little in the import graph.
Replaced most imports of GHC.Internal.Base with non-wildcard imports
from modules where the identifiers are actually defined.
Part of #26834
Metric Decrease:
T5321FD
- - - - -
7fb51f54 by mangoiv at 2026-03-17T23:48:00-04:00
ci: clone, don't copy when creating the cabal cache
Also removed WINDOWS_HOST variable detected via uname - we now just
check whether the CI job has windows in its name. This works because we
only ever care about it if the respective job is not a cross job. We
also statically detect darwin cross jobs in the same way. We only ever have
darwin -> darwin cross jobs so this is enough to detect the host
reliably.
- - - - -
f8817879 by mangoiv at 2026-03-17T23:48:44-04:00
ci: mark size_hello_artifact fragile on darwin x86
The size of the x86_64 hello artifact is not stable which results in flaky testruns.
Resolves #26814
- - - - -
e34cb6da by Adam Gundry at 2026-03-20T12:20:00-04:00
ghci: Mention active language edition in startup banner
Per GHC proposal 632, this makes the GHCi startup banner include
the active language edition, plus an indication of whether this
was the default (as opposed to being explicitly selected via an
option such as `-XGHC2024`). For example:
```
$ ghci
GHCi, version 9.14.1: https://www.haskell.org/ghc/ :? for help
Using default language edition: GHC2024
ghci>
```
Fixes #26037.
- - - - -
52c3e6ba by sheaf at 2026-03-20T12:21:09-04:00
Improve incomplete record selector warnings
This commit stops GHC from emitting spurious incomplete record selector
warnings for bare selectors/projections such as .fld
There are two places we currently emit incomplete record selector
warnings:
1. In the desugarer, when we see a record selector or an occurrence
of 'getField'. Here, we can use pattern matching information to
ensure we don't give false positives.
2. In the typechecker, which might sometimes give false positives but
can emit warnings in cases that the pattern match checker would
otherwise miss.
This is explained in Note [Detecting incomplete record selectors]
in GHC.HsToCore.Pmc.
Now, we obviously don't want to emit the same error twice, and generally
we prefer (1), as those messages contain fewer false positives. So we
suppress (2) when we are sure we are going to emit (1); the logic for
doing so is in GHC.Tc.Instance.Class.warnIncompleteRecSel,
and works by looking at the CtOrigin.
Now, the issue was that this logic handled explicit record selectors as
well as overloaded record field selectors such as "x.r" (which turns
into a simple GetFieldOrigin CtOrigin), but it didn't properly handle
record projectors like ".fld" or ".fld1.fld2" (which result in other
CtOrigins such as 'RecordFieldProjectionOrigin').
To solve this problem, we re-use the 'isHasFieldOrigin' introduced in
fbdc623a (slightly adjusted).
On the way, we also had to update the desugarer with special handling
for the 'ExpandedThingTc' case in 'ds_app', to make sure that
'ds_app_var' sees all the type arguments to 'getField' in order for it
to indeed emit warnings like in (1).
Fixes #26686
- - - - -
309d7e87 by Cheng Shao at 2026-03-20T12:21:53-04:00
rts: opportunistically grow the MutableByteArray# in-place in resizeMutableByteArray#
Following !15234, this patch improves `resizeMutableByteArray#` memory
efficiency by growing the `MutableByteArray#` in-place if possible,
addressing an old todo comment here. Also adds a new test case
`resizeMutableByteArrayInPlace` that stresses this behavior.
- - - - -
7d4ef162 by Matthew Craven at 2026-03-20T12:22:47-04:00
Change representation of floating point literals
This commit changes the representation of floating point literals
throughough the compiler, in particular in Core and Cmm.
The Rational type is deficient for this purpose, dealing poorly
with NaN, +/-Infinity, and negative zero. Instead, the new module
GHC.Types.Literal.Floating uses the host Float/Double type to represent
NaNs, infinities and negative zero. It also contains a Rational
constructor, for the benefit of -fexcess-precision.
Other changes:
- Remove Note [negative zero] and related code
This also removes the restrictions on constant-folding of division
by zero, and should make any problems with NaN/Infinity more obvious.
- Use -0.0 as the additive identity for Core constant folding rules
for floating-point addition, fixing #21227.
- Manual worker-wrapper for GHC.Float.rationalToDouble. This is
intended to prevent the compiler's WW on this function from
interfering with constant-folding. This change means that we now
avoid allocating a box for the result of a 'realToFrac' call in
T10359.
- Combine floatDecodeOp and doubleDecodeOp.
This change also fixes a bug in doubleDecodeOp wherein it
would incorrectly produce an Int# instead of an Int64#
literal for the mantissa component with 64-bit targets.
- Use Float/Double for assembly immediates, and update the X86 and
PowerPC backends to properly handle special values such as NaN and
infinity.
- Allow 'rational_to' to handle zero denominators, fixing a
TODO in GHC.Core.Opt.ConstantFold.
Fixes #8364 #9811 #18897 #21227
Progress towards #26919
Metric Decrease:
T10359
Co-authored-by: sheaf <sam.derbyshire(a)gmail.com>
-------------------------
Metric Decrease:
T1969
T5321FD
-------------------------
- - - - -
80e2dd4f by Zubin Duggal at 2026-03-20T12:23:33-04:00
compiler/ffi: Collapse void pointer chains in capi wrappers
New gcc/clang treat -Wincompatible-pointer-types as an error by
default. Since C only allows implicit conversion from void*, not void**,
capi wrappers for functions taking e.g. abstract** would fail to compile
when the Haskell type Ptr (Ptr Abstract) was naively translated to void**.
Collapse nested void pointers to a single void* when the pointee type
has no known C representation.
Fixes #26852
- - - - -
1c50bd7b by Luite Stegeman at 2026-03-20T12:24:37-04:00
Move some functions related to pointer tagging to a separate module
- - - - -
bfd7aafd by Luite Stegeman at 2026-03-20T12:24:37-04:00
Branchless unpacking for enumeration types
Change unpacking for enumeration types to go to Word8#/Word16#/Word#
directly instead of going through an intermediate unboxed sum. This
allows us to do a branchless conversion using DataToTag and TagToEnum.
Fixes #26970
- - - - -
72b20fc0 by Luite Stegeman at 2026-03-20T12:25:30-04:00
bytecode: Carefully SLIDE off the end of a stack chunk
The SLIDE bytecode instruction was not checking for stack chunk
boundaries and could corrupt the stack underflow frame, leading
to crashes.
We add a check to use safe writes if we cross the chunk boundary
and also handle stack underflow if Sp is advanced past the underflow
frame.
fix #27001
- - - - -
2e22b43c by Cheng Shao at 2026-03-20T12:26:14-04:00
ghci: serialize BCOByteArray buffer directly when possible
This patch changes the `Binary` instances of `BCOByteArray` to
directly serialize the underlying buffer when possible, while also
taking into account the issue of host-dependent `Word` width. See
added comments and amended `Note [BCOByteArray serialization]` for
detailed explanation. Closes #27020.
- - - - -
89d9ba37 by Sylvain Henry at 2026-03-20T12:27:34-04:00
JS: replace BigInt with Number arithmetic for 32/64-bit quot/rem (#23597)
Replace BigInt-based implementations of quotWord32, remWord32,
quotRemWord32, quotRem2Word32, quotWord64, remWord64, quotInt64, and
remInt64 with pure Number (double/integer) arithmetic to avoid the
overhead of BigInt promotion.
- - - - -
ae4ddd60 by Sylvain Henry at 2026-03-20T12:28:28-04:00
Core: add constant-folding rules for Addr# eq/ne (#18032)
- - - - -
3e767f98 by Matthew Pickering at 2026-03-20T12:29:11-04:00
Use OsPath rather than FilePath in Downsweep cache
This gets us one step closure to uniformly using `OsPath` in the
compiler.
- - - - -
2c57de29 by Cheng Shao at 2026-03-20T12:29:55-04:00
hadrian: fix ghc-in-ghci flavour stage0 shared libraries
This patch fixes missing stage0 shared libraries in hadrian
ghc-in-ghci flavour, which was accidentally dropped in
669d09f950a6e88b903d9fd8a7571531774d4d5d and resulted in a regression
in HLS support on linux/macos. Fixes #27057.
- - - - -
5b1be555 by Sylvain Henry at 2026-03-20T12:30:48-04:00
JS: install rts/Types.h header file (#27033)
It was an omission, making HsFFI.h not usable with GHC using the JS
backend.
- - - - -
b883f08f by Cheng Shao at 2026-03-20T12:31:33-04:00
hadrian: don't compile RTS with -Winline
This patch removes `-Winline` from cflags when compiling the RTS,
given that:
1. It generates a huge pile of spam and hurts developer experience
2. Whether inlining happens is highly dependent on toolchains,
flavours, etc, and it's not really an issue to fix if inlining
doesn't happen; it's a hint to the C compiler anyway.
Fixes #27060.
- - - - -
333387d6 by Cheng Shao at 2026-03-20T12:31:33-04:00
hadrian: compile libffi-clib with -Wno-deprecated-declarations
This patch adds `-Wno-deprecated-declarations` to cflags of
`libffi-clib`, given that it produces noise at compile-time that
aren't really our issue to fix anyway, it's from vendored libffi
source code.
- - - - -
67c47771 by Rodrigo Mesquita at 2026-03-20T12:32:17-04:00
Expose decodeStackWithIpe from ghc-experimental
This decoding is useful to the debugger and it wasn't originally
exported as an oversight.
- - - - -
18513365 by Matthew Pickering at 2026-03-21T04:43:26-04:00
Add support for custom external interpreter commands
It can be useful for GHC API clients to implement their own external
interpreter commands.
For example, the debugger may want an efficient way to inspect the
stacks of the running threads in the external interpreter.
- - - - -
4636d906 by mangoiv at 2026-03-21T04:44:10-04:00
ci: remove obsolete fallback for old debian and ubuntu versions
- - - - -
2e3a2805 by mangoiv at 2026-03-21T04:44:10-04:00
ci: drop ubuntu 18 and 20
Ubuntu 18 EOL: May 2023
Ubuntu 20 EOL: May 2025
We should probably not make another major release supporting these platforms.
Also updates the generator script.
Resolves #25876
- - - - -
de54e264 by Cheng Shao at 2026-03-21T17:52:08+01:00
rts: fix -Wcompare-distinct-pointer-types errors
This commit fixes `-Wcompare-distinct-pointer-types` errors in the RTS
which should have been caught by the `validate` flavour but was
warnings in CI due to the recent `+werror` regression.
- - - - -
b9bd73de by Cheng Shao at 2026-03-21T17:52:08+01:00
ghc-internal: fix unused imports
This commit fixes unused imports in `ghc-internal` which should have
been caught by the `validate` flavour but was warnings in CI due to
the recent `+werror` regression. Fixes #26987 #27059.
- - - - -
da946a16 by Cheng Shao at 2026-03-21T17:03:51+00:00
ghci: fix unused imports
This commit fixes unused imports in `ghci` which should have been
caught by the `validate` flavour but was warnings in CI due to the
recent `+werror` regression. Fixes #26987 #27059.
- - - - -
955b1cf8 by Cheng Shao at 2026-03-21T17:03:51+00:00
compiler: fix unused imports in GHC.Tc.Types.Origin
This commit fixes unused imports in `GHC.Tc.Types.Origin` which should
have been caught by the `validate` flavour but was warnings in CI due
to the recent `+werror` regression. Fixes #27059.
- - - - -
3b1aeb50 by Cheng Shao at 2026-03-21T17:03:51+00:00
hadrian: fix missing +werror in validate flavour
This patch fixes missing `+werror` in validate flavour, which was an
oversight in bb3a2ba1eefadf0b2ef4f39b31337a23eec67f29. Fixes #27066.
- - - - -
44f118f0 by Cheng Shao at 2026-03-22T04:54:01-04:00
ci: bump CACHE_REV and add the missing reminder
This patch bumps `CACHE_REV` to address recent `[Cabal-7159]` CI
errors due to stale cabal cache on some runners, and also adds a
reminder to remind future maintainers. Fixes #27075.
- - - - -
2a218737 by ARATA Mizuki at 2026-03-23T11:11:39-04:00
Add 128-bit SIMD support to AArch64 NCG
Changes:
- Add `Format` field to vector-capable instructions.
These instructions will emit `vN.4s` (for example) as a operand.
- Additional constructors for `Operand`:
`OpVecLane` represents a vector lane and will be emitted as `vN.<width>[<index>]` (`vN.s[3]` for example).
`OpScalarAsVec` represents a scalar, but printed as a vector lane like `vN.<width>[0]` (`vN.s[0]` for example).
- Integer quot/rem are implemented in C, like x86.
Closes #26536
Metric Increase:
T3294
- - - - -
5d6e2be9 by ARATA Mizuki at 2026-03-23T11:11:39-04:00
AArch64 NCG: Improve code generation for floating-point and vector constants
Some floating-point constants can be directly encoded using the FMOV instruction.
Similarly, a class of vectors with same values can be encoded using FMOV, MOVI, or MVNI.
- - - - -
c6d262aa by Simon Jakobi at 2026-03-23T11:12:22-04:00
Add regression test for #13729
Closes #13729.
- - - - -
aa5dfe67 by Sylvain Henry at 2026-03-26T03:48:56-04:00
Check that shift values are valid
In GHC's codebase in non-DEBUG builds we silently substitute shiftL/R
with unsafeShiftL/R for performance reasons. However we were not
checking that the shift value was valid for unsafeShiftL/R, leading to
wrong computations, but only in non-DEBUG builds.
This patch adds the necessary checks and reports an error when a wrong
shift value is passed.
- - - - -
c8a7b588 by Sylvain Henry at 2026-03-26T03:48:56-04:00
Implement basic value range analysis (#25718)
Perform basic value range analysis to try to determine at compile time
the result of the application of some comparison primops (ltWord#, etc.).
This subsumes the built-in rewrite rules used previously to check if one
of the comparison argument was a bound (e.g. (x :: Word8) <= 255 is
always True). Our analysis is more powerful and handles type
conversions: e.g. word8ToWord x <= 255 is now detected as always True too.
We also use value range analysis to filter unreachable alternatives in
case-expressions. To support this, we had to allow case-expressions for
primitive types to not have a DEFAULT alternative (as was assumed before
and checked in Core lint).
- - - - -
a5ec467e by ARATA Mizuki at 2026-03-26T03:49:49-04:00
rts: Align stack to 64-byte boundary in StgRun on x86
When LLVM spills AVX/AVX-512 vector registers to the stack, it requires
32-byte (__m256) or 64-byte (__m512) alignment. If the stack is not
sufficiently aligned, LLVM inserts a realignment prologue that reserves
%rbp as a frame pointer, conflicting with GHC's use of %rbp as an STG
callee-saved register and breaking the tail-call-based calling convention.
Previously, GHC worked around this by lying to LLVM about the stack
alignment and rewriting aligned vector loads/stores (VMOVDQA, VMOVAPS)
to unaligned ones (VMOVDQU, VMOVUPS) in the LLVM Mangler. This had two
problems:
- It did not extend to AVX-512, which requires 64-byte alignment. (#26595)
- When Haskell calls a C function that takes __m256/__m512 arguments on
the stack, the callee requires genuine alignment, which could cause a
segfault. (#26822)
This patch genuinely aligns the stack to 64 bytes in StgRun by saving
the original stack pointer before alignment and restoring it in
StgReturn. We now unconditionally advertise 64-byte stack alignment to
LLVM for all x86 targets, making rewriteAVX in the LLVM Mangler
unnecessary. STG_RUN_STACK_FRAME_SIZE is increased from 48 to 56 bytes
on non-Windows x86-64 to store the saved stack pointer.
Closes #26595 and #26822
Co-Authored-By: Claude Opus 4.5 <noreply(a)anthropic.com>
- - - - -
661da815 by Teo Camarasu at 2026-03-26T03:50:33-04:00
ghc-internal: Float Generics to near top of module graph
We remove GHC.Internal.Generics from the critical path of the
`ghc-internal` module graph. GHC.Internal.Generics used to be in the
middle of the module graph, but now it is nearer the top (built later).
This change thins out the module graph and allows us to get rid of the
ByteOrder hs-boot file.
We implement this by moving Generics instances from the module where the
datatype is defined to the GHC.Internal.Generics module. This trades off
increasing the compiled size of GHC.Internal.Generics with reducing the
dependency footprint of datatype modules.
Not all instances are moved to GHC.Internal.Generics. For instance,
`GHC.Internal.Control.Monad.Fix` keeps its instance as it is one of the
very last modules compiled in `ghc-internal` and so inverting the
relationship here would risk adding GHC.Internal.Generics back onto the
critical path.
We also don't change modules that are re-exported from the `template-haskell` or `ghc-heap`.
This is done to make it easy to eventually move `Generics` to `base`
once something like #26657 is implemented.
Resolves #26930
Metric Decrease:
T21839c
- - - - -
45428f88 by sheaf at 2026-03-26T03:51:31-04:00
Avoid infinite loop in deep subsumption
This commit ensures we only unify after we recur in the deep subsumption
code in the FunTy vs non-FunTy case of GHC.Tc.Utils.Unify.tc_sub_type_deep,
to avoid falling into an infinite loop.
See the new Wrinkle [Avoiding a loop in tc_sub_type_deep] in
Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify.
Fixes #26823
Co-authored-by: simonpj <simon.peytonjones(a)gmail.com>
- - - - -
2823b039 by Ian Duncan at 2026-03-26T03:52:21-04:00
AArch64: fix MOVK regUsageOfInstr to mark dst as both read and written
MOVK (move with keep) modifies only a 16-bit slice of the destination
register, so the destination is both read and written. The register
allocator must know this to avoid clobbering live values. Update
regUsageOfInstr to list the destination in both src and dst sets.
No regression test: triggering the misallocation requires specific
register pressure around a MOVK sequence, which is difficult to
reliably provoke from Haskell source.
- - - - -
57b7878d by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #12002
Closes #12002.
- - - - -
c8f9df2d by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #12046
Closes #12046.
Co-authored-by: Andreas Klebinger <klebinger.andreas(a)gmx.at>
- - - - -
615d72ac by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #13180
Closes #13180.
- - - - -
423eebcf by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #11141
Closes #11141.
- - - - -
286849a4 by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #11505
Closes #11505.
- - - - -
7db149d9 by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression perf test for #13820
Closes #13820.
- - - - -
e73c4adb by Simon Jakobi at 2026-03-26T03:53:07-04:00
Add regression test for #10381
Closes #10381.
- - - - -
5ebcfb57 by Benjamin Maurer at 2026-03-26T03:54:02-04:00
Generate assembly on x86 for word2float (#22252)
We used to emit C function call for MO_UF_Conv primitive.
Now emits direct assembly instead.
Co-Authored-By: Sylvain Henry <sylvain(a)haskus.fr>
Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com>
- - - - -
5b550754 by Matthew Pickering at 2026-03-26T03:54:51-04:00
rts: forward clone-stack messages after TSO migration
MSG_CLONE_STACK assumed that the target TSO was still owned by the
capability that received the message. This is not always true: the TSO
can migrate before the inbox entry is handled.
When that happened, handleCloneStackMessage could clone a live stack from
the wrong capability and use the wrong capability for allocation and
performTryPutMVar, leading to stack sanity failures such as
checkStackFrame: weird activation record found on stack.
Fix this by passing the current capability into
handleCloneStackMessage, rechecking msg->tso->cap at handling time, and
forwarding the message if the TSO has migrated. Once ownership matches,
use the executing capability consistently for cloneStack, rts_apply, and
performTryPutMVar.
Fixes #27008
- - - - -
ef0a1bd2 by mangoiv at 2026-03-26T03:55:34-04:00
release tracking: adopt release tracking ticket from #16816
- - - - -
a7f40fd9 by mangoiv at 2026-03-26T03:55:34-04:00
release tracking: add a release tracking ticket
Brings the information in the release tracking ticket up to date with
https://gitlab.haskell.org/ghc/ghc-hq/-/blob/main/release-management.mkd
Resolves #26691
- - - - -
161d3285 by Teo Camarasu at 2026-03-26T03:56:18-04:00
Revert "Set default eventlog-flush-interval to 5s"
Flushing the eventlog forces a synchronisation of all the capabilities
and there was a worry that this might lead to a performance cost for
some highly parallel workloads.
This reverts commit 66b96e2a591d8e3d60e74af3671344dfe4061cf2.
- - - - -
36eed985 by Cheng Shao at 2026-03-26T03:57:03-04:00
ghc-boot: move GHC.Data.SmallArray to ghc-boot
This commit moves `GHC.Data.SmallArray` from the `ghc` library to
`ghc-boot`, so that it can be used by `ghci` as well:
- The `Binary` (from `ghc`) instance of `SmallArray` is moved to
`GHC.Utils.Binary`
- Util functions `replicateSmallArrayIO`, `mapSmallArrayIO`,
`mapSmallArrayM_`, `imapSmallArrayM_` , `smallArrayFromList` and
`smallArrayToList` are added
- The `Show` instance is added
- The `Binary` (from `binary`) instance is added
- - - - -
fdf828ae by Cheng Shao at 2026-03-26T03:57:03-04:00
compiler: use `Binary` instance of `BCOByteArray` for bytecode objects
This commit defines `Binary` (from `compiler`) instance of
`BCOByteArray` which serializes the underlying buffer directly, and
uses it directly in bytecode object serialization. Previously we reuse
the `Binary` (from `binary`) instance, and this change allows us to
avoid double-copying via an intermediate `ByteString` when using
`put`/`get` in `binnary`. Also see added comment for explanation.
- - - - -
3bf62d0a by Cheng Shao at 2026-03-26T03:57:03-04:00
ghci: use SmallArray directly in ResolvedBCO
This patch makes ghci use `SmallArray` directly in `ResolvedBCO` when
applicable, making the memory representation more compact and reducing
marshaling overhead. Closes #27058.
- - - - -
3d6492ce by Wen Kokke at 2026-03-26T03:57:53-04:00
Fix race condition between flushEventLog and start/endEventLogging.
This commit changes `flushEventLog` to acquire/release the `state_change` mutex to prevent interleaving with `startEventLogging` and `endEventLogging`. In the current RTS, `flushEventLog` _does not_ acquire this mutex, which may lead to eventlog corruption on the following interleaving:
- `startEventLogging` writes the new `EventLogWriter` to `event_log_writer`.
- `flushEventLog` flushes some events to `event_log_writer`.
- `startEventLogging` writes the eventlog header to `event_log_writer`.
This causes the eventlog to be written out in an unreadable state, with one or more events preceding the eventlog header.
This commit renames the old function to `flushEventLog_` and defines `flushEventLog` simply as:
```c
void flushEventLog(Capability **cap USED_IF_THREADS)
{
ACQUIRE_LOCK(&state_change_mutex);
flushEventLog_(cap);
RELEASE_LOCK(&state_change_mutex);
}
```
The old function is still needed internally within the compilation unit, where it is used in `endEventLogging` in a context where the `state_change` mutex has already been acquired. I've chosen to mark `flushEventLog_` as static and let other uses of `flushEventLog` within the RTS refer to the new version. There is one use in `hs_init_ghc` via `flushTrace`, where the new locking behaviour should be harmless, and one use in `handle_tick`, which I believe was likely vulnerable to the same race condition, so the new locking behaviour is desirable.
I have not added a test. The behaviour is highly non-deterministic and requires a program that concurrently calls `flushEventLog` and `startEventLogging`/`endEventLogging`. I encountered the issue while developing `eventlog-socket` and within that context have verified that my patch likely addresses the issue: a test that used to fail within the first dozen or so runs now has been running on repeat for several hours.
- - - - -
7b9a75f0 by Phil Hazelden at 2026-03-26T03:58:37-04:00
Fix build with werror on glibc 2.43.
We've been defining `_XOPEN_SOURCE` and `_POSIX_C_SOURCE` to the same
values as defined in glibc prior to 2.43. But in 2.43, glibc changes
them to new values, which means we get a warning when redefining them.
By `#undef`ing them first, we no longer get a warning.
Closes #27076.
- - - - -
fe6e76c5 by Tobias Haslop at 2026-03-26T03:59:30-04:00
Fix broken Haddock link to Bifunctor class in description of Functor class
- - - - -
81327a0f by Vladislav Zavialov at 2026-03-26T22:06:11+03:00
Infix holes in types (#11107)
This patch introduces several improvements that follow naturally from
refactoring HsOpTy to represent the operator as an HsType, aligning it
with the approach taken by OpApp and HsExpr.
User-facing changes:
1. Infix holes (t1 `_` t2) are now permitted in types, following the
precedent set by term-level expressions.
Test case: T11107
2. Error messages for illegal promotion ticks are now reported at more
precise source locations.
Test case: T17865
Internal changes:
* The definition of HsOpTy now mirrors that of OpApp:
| HsOpTy (XOpTy p) (LHsType p) (LHsType p) (LHsType p)
| OpApp (XOpApp p) (LHsExpr p) (LHsExpr p) (LHsExpr p)
This moves us one step closer to unifying HsType and HsExpr.
* Ignoring locations,
the old pattern match (HsOpTy x prom lhs op rhs)
is now written as (HsOpTy x lhs (HsTyVar x' prom op) rhs)
but we also handle (HsOpTy x lhs (HsWildCardTy x') rhs)
Constructors other than HsTyVar and HsWildCardTy never appear
in the operator position.
* The various definitions across the compiler have been updated to work
with the new representation, drawing inspiration from the term-level
pipeline where appropriate. For example,
ppr_infix_ty <=> ppr_infix_expr
get_tyop <=> get_op
lookupTypeFixityRn <=> lookupExprFixityRn
(the latter is factored out from rnExpr)
Test cases: T11107 T17865
- - - - -
801 changed files:
- .gitlab-ci.yml
- .gitlab/ci.sh
- .gitlab/generate-ci/flake.lock
- .gitlab/generate-ci/gen_ci.hs
- + .gitlab/issue_templates/release_tracking.md
- .gitlab/jobs.yaml
- .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py
- .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
- compiler/CodeGen.Platform.h
- compiler/GHC/Builtin/Names.hs
- compiler/GHC/Builtin/Names/TH.hs
- compiler/GHC/Builtin/PrimOps.hs
- compiler/GHC/Builtin/Utils.hs
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/ByteCode/Asm.hs
- compiler/GHC/ByteCode/Linker.hs
- compiler/GHC/ByteCode/Serialize.hs
- compiler/GHC/Cmm/CommonBlockElim.hs
- compiler/GHC/Cmm/Expr.hs
- compiler/GHC/Cmm/MachOp.hs
- compiler/GHC/Cmm/Node.hs
- compiler/GHC/Cmm/Opt.hs
- compiler/GHC/Cmm/Parser.y
- compiler/GHC/Cmm/Type.hs
- compiler/GHC/Cmm/Utils.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/AArch64/Instr.hs
- compiler/GHC/CmmToAsm/AArch64/Ppr.hs
- compiler/GHC/CmmToAsm/AArch64/Regs.hs
- compiler/GHC/CmmToAsm/LA64/CodeGen.hs
- compiler/GHC/CmmToAsm/LA64/Ppr.hs
- compiler/GHC/CmmToAsm/LA64/Regs.hs
- compiler/GHC/CmmToAsm/PPC/CodeGen.hs
- compiler/GHC/CmmToAsm/PPC/Ppr.hs
- compiler/GHC/CmmToAsm/PPC/Regs.hs
- compiler/GHC/CmmToAsm/RV64/CodeGen.hs
- compiler/GHC/CmmToAsm/RV64/Ppr.hs
- compiler/GHC/CmmToAsm/RV64/Regs.hs
- compiler/GHC/CmmToAsm/Reg/Graph/TrivColorable.hs
- compiler/GHC/CmmToAsm/Wasm/FromCmm.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToAsm/X86/Instr.hs
- compiler/GHC/CmmToAsm/X86/Ppr.hs
- compiler/GHC/CmmToAsm/X86/Regs.hs
- compiler/GHC/CmmToC.hs
- compiler/GHC/CmmToLlvm.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/CmmToLlvm/Config.hs
- compiler/GHC/CmmToLlvm/Data.hs
- compiler/GHC/CmmToLlvm/Mangler.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/Opt/DmdAnal.hs
- + compiler/GHC/Core/Opt/Range.hs
- compiler/GHC/Core/Opt/Simplify/Iteration.hs
- compiler/GHC/Driver/Config/CmmToLlvm.hs
- compiler/GHC/Driver/Config/StgToCmm.hs
- compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Driver/Main.hs
- compiler/GHC/Driver/Pipeline.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/HsToCore/Expr.hs
- compiler/GHC/HsToCore/Foreign/C.hs
- compiler/GHC/HsToCore/Match/Literal.hs
- compiler/GHC/HsToCore/Pmc.hs
- compiler/GHC/HsToCore/Pmc/Solver/Types.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Ext/Utils.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Linker/Loader.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/PostProcess.hs
- + compiler/GHC/Platform/Tag.hs
- compiler/GHC/Prelude/Basic.hs
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/Fixity.hs
- compiler/GHC/Rename/HsType.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Runtime/Interpreter/Init.hs
- compiler/GHC/Runtime/Interpreter/JS.hs
- compiler/GHC/Runtime/Interpreter/Types.hs
- compiler/GHC/Stg/Pipeline.hs
- compiler/GHC/Stg/Unarise.hs
- compiler/GHC/StgToByteCode.hs
- compiler/GHC/StgToCmm/Closure.hs
- compiler/GHC/StgToCmm/Expr.hs
- compiler/GHC/StgToCmm/Lit.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToCmm/Utils.hs
- compiler/GHC/StgToJS/Literal.hs
- compiler/GHC/StgToJS/Object.hs
- compiler/GHC/StgToJS/Prim.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Foreign.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Gen/Pat.hs
- compiler/GHC/Tc/Gen/Sig.hs
- compiler/GHC/Tc/Instance/Class.hs
- compiler/GHC/Tc/Instance/Typeable.hs
- compiler/GHC/Tc/TyCl/Build.hs
- compiler/GHC/Tc/Types/Origin.hs
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/ThToHs.hs
- compiler/GHC/Types/Demand.hs
- compiler/GHC/Types/Id/Make.hs
- compiler/GHC/Types/Literal.hs
- + compiler/GHC/Types/Literal/Floating.hs
- compiler/GHC/Types/RepType.hs
- compiler/GHC/Unit/State.hs
- compiler/GHC/Utils/Binary.hs
- compiler/GHC/Utils/Error.hs
- compiler/Language/Haskell/Syntax/Type.hs
- compiler/ghc.cabal.in
- configure.ac
- distrib/configure.ac.in
- docs/users_guide/9.16.1-notes.rst
- docs/users_guide/exts/pragmas.rst
- docs/users_guide/exts/recursive_do.rst
- docs/users_guide/exts/rewrite_rules.rst
- docs/users_guide/ghci.rst
- docs/users_guide/using-optimisation.rst
- docs/users_guide/utils.py
- ghc/GHCi/UI.hs
- ghc/Main.hs
- hadrian/README.md
- hadrian/bootstrap/generate_bootstrap_plans
- hadrian/bootstrap/plan-9_10_1.json
- hadrian/bootstrap/plan-9_10_2.json
- + hadrian/bootstrap/plan-9_10_3.json
- hadrian/bootstrap/plan-9_12_1.json
- hadrian/bootstrap/plan-9_12_2.json
- + hadrian/bootstrap/plan-9_14_1.json
- hadrian/bootstrap/plan-bootstrap-9_10_1.json
- hadrian/bootstrap/plan-bootstrap-9_10_2.json
- + hadrian/bootstrap/plan-bootstrap-9_10_3.json
- hadrian/bootstrap/plan-bootstrap-9_12_1.json
- hadrian/bootstrap/plan-bootstrap-9_12_2.json
- + hadrian/bootstrap/plan-bootstrap-9_14_1.json
- hadrian/build-cabal
- hadrian/cabal.project
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- hadrian/src/Rules/Generate.hs
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- hadrian/src/Settings/Builders/GenPrimopCode.hs
- hadrian/src/Settings/Builders/Ghc.hs
- − hadrian/src/Settings/Flavours/Benchmark.hs
- hadrian/src/Settings/Flavours/Development.hs
- hadrian/src/Settings/Flavours/GhcInGhci.hs
- hadrian/src/Settings/Flavours/Quick.hs
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- libraries/base/tests/IO/all.T
- libraries/ghc-boot-th/GHC/Boot/TH/Quote.hs
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- libraries/ghc-internal/src/GHC/Internal/Clock.hsc
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[Git][ghc/ghc][wip/jeltsch/system-io-implementation-into-base] Move most of the `System.IO` implementation into `base`
by Wolfgang Jeltsch (＠jeltsch) 26 Mar '26
by Wolfgang Jeltsch (＠jeltsch) 26 Mar '26
26 Mar '26
Wolfgang Jeltsch pushed to branch wip/jeltsch/system-io-implementation-into-base at Glasgow Haskell Compiler / GHC
Commits:
2edd18b6 by Wolfgang Jeltsch at 2026-03-26T20:04:16+02:00
Move most of the `System.IO` implementation into `base`
This involves a rewrite of the `combine` helper function to avoid the
use of `last`, which would now be flagged as an error.
- - - - -
27 changed files:
- libraries/base/src/Control/Concurrent.hs
- libraries/base/src/GHC/IO/Handle.hs
- libraries/base/src/Prelude.hs
- libraries/base/src/System/IO.hs
- libraries/base/src/Text/Printf.hs
- libraries/ghc-internal/src/GHC/Internal/System/IO.hs
- testsuite/tests/interface-stability/base-exports.stdout
- testsuite/tests/interface-stability/base-exports.stdout-javascript-unknown-ghcjs
- testsuite/tests/interface-stability/base-exports.stdout-mingw32
- testsuite/tests/interface-stability/base-exports.stdout-ws-32
- testsuite/tests/typecheck/should_compile/T9497a.stderr
- testsuite/tests/typecheck/should_compile/holes.stderr
- testsuite/tests/typecheck/should_compile/holes3.stderr
- testsuite/tests/typecheck/should_compile/valid_hole_fits.stderr
- testsuite/tests/typecheck/should_fail/T9497d.stderr
- testsuite/tests/typecheck/should_run/T9497a-run.stderr
- testsuite/tests/typecheck/should_run/T9497b-run.stderr
- testsuite/tests/typecheck/should_run/T9497c-run.stderr
- utils/haddock/html-test/ref/Bug1004.html
- utils/haddock/html-test/ref/Bug973.html
- utils/haddock/html-test/ref/ConstructorPatternExport.html
- utils/haddock/html-test/ref/DefaultSignatures.html
- utils/haddock/html-test/ref/Hash.html
- utils/haddock/html-test/ref/PatternSyns.html
- utils/haddock/html-test/ref/PatternSyns2.html
- utils/haddock/html-test/ref/QuasiExpr.html
- utils/haddock/html-test/ref/Test.html
Changes:
=====================================
libraries/base/src/Control/Concurrent.hs
=====================================
@@ -120,7 +120,7 @@ import GHC.Internal.System.Posix.Types ( Fd )
#if defined(mingw32_HOST_OS)
import GHC.Internal.Foreign.C.Error
import GHC.Internal.Foreign.C.Types
-import GHC.Internal.System.IO
+import System.IO
import GHC.Internal.Data.Functor ( void )
import GHC.Internal.Int ( Int64 )
#else
=====================================
libraries/base/src/GHC/IO/Handle.hs
=====================================
@@ -53,6 +53,7 @@ module GHC.IO.Handle
hGetEcho,
hIsTerminalDevice,
hSetNewlineMode,
+ hGetNewlineMode,
Newline(..),
NewlineMode(..),
nativeNewline,
=====================================
libraries/base/src/Prelude.hs
=====================================
@@ -165,7 +165,7 @@ module Prelude (
) where
import GHC.Internal.Control.Monad
-import GHC.Internal.System.IO
+import System.IO
import GHC.Internal.System.IO.Error
import qualified GHC.Internal.Data.List as List
import GHC.Internal.Data.Either
=====================================
libraries/base/src/System/IO.hs
=====================================
@@ -1,4 +1,5 @@
-{-# LANGUAGE Safe #-}
+{-# LANGUAGE Trustworthy #-}
+{-# LANGUAGE CPP #-}
-- |
--
@@ -184,8 +185,681 @@ module System.IO
nativeNewlineMode
) where
-import GHC.Internal.System.IO
+import GHC.Internal.System.IO (putStrLn, print)
+
+import GHC.Base (Bool (False, True), otherwise, failIO)
+import GHC.Err (errorWithoutStackTrace)
+import GHC.List (null, elem, unsnoc, (++), reverse, break)
+import GHC.Num ((+))
+import GHC.IO (IO, FilePath)
+import GHC.IO.IOMode (IOMode (ReadMode, WriteMode, ReadWriteMode, AppendMode))
+import qualified GHC.Internal.IO.FD as FD
+import GHC.IO.Encoding
+ (
+ TextEncoding,
+ mkTextEncoding,
+ getLocaleEncoding,
+ initLocaleEncoding,
+ utf8,
+ utf8_bom,
+ utf16,
+ utf16be,
+ utf16le,
+ utf32,
+ utf32be,
+ utf32le,
+ latin1,
+ char8
+ )
+import GHC.IO.Handle
+ (
+ Handle,
+ hLookAhead,
+ hFlush,
+ hClose,
+ hSetBinaryMode,
+ hSetEncoding,
+ hSetNewlineMode,
+ hSetEcho,
+ hSetFileSize,
+ hGetEncoding,
+ hGetNewlineMode,
+ hGetEcho,
+ hFileSize,
+ hIsOpen,
+ hIsReadable,
+ hIsSeekable,
+ hIsWritable,
+ hIsTerminalDevice,
+ hIsEOF,
+ hIsClosed,
+ hShow,
+ BufferMode (NoBuffering, LineBuffering, BlockBuffering),
+ hSetBuffering,
+ hGetBuffering,
+ HandlePosn,
+ hSetPosn,
+ hGetPosn,
+ SeekMode (AbsoluteSeek, RelativeSeek, SeekFromEnd),
+ hSeek,
+ hTell,
+ Newline (LF, CRLF),
+ nativeNewline,
+ NewlineMode (NewlineMode, inputNL, outputNL),
+ noNewlineTranslation,
+ nativeNewlineMode,
+ universalNewlineMode,
+ isEOF
+ )
+import GHC.IO.Handle.Text
+ (
+ hPutChar,
+ hPutStr,
+ hPutStrLn,
+ hPutBuf,
+ hPutBufNonBlocking,
+ hGetChar,
+ hGetContents,
+ hGetContents',
+ hGetLine,
+ hGetBuf,
+ hGetBufNonBlocking,
+ hGetBufSome,
+ hWaitForInput
+ )
+import qualified GHC.Internal.IO.Handle.FD as POSIX
+import GHC.IO.StdHandles
+ (
+ openBinaryFile,
+ withBinaryFile,
+ openFile,
+ withFile,
+ stdin,
+ stdout,
+ stderr
+ )
+import GHC.IORef (atomicModifyIORef'_)
import GHC.Internal.Control.Monad.Fix (fixIO)
+import Control.Monad (return, (>>=))
+import Control.Exception (ioError)
+import Data.Eq ((==))
+import Data.Ord ((<))
+import Data.Bits ((.|.))
+import Data.Function (($), (.))
+import Data.Maybe (Maybe (Nothing, Just))
+import Data.Char (Char)
+import Data.String (String)
+import Data.Int (Int)
+import Data.IORef (IORef, newIORef)
+import System.IO.Error (userError)
+import System.IO.Unsafe (unsafePerformIO)
+import System.Posix.Internals
+ (
+ c_getpid,
+ c_open,
+ o_CREAT,
+ o_EXCL,
+ o_BINARY,
+ o_NONBLOCK,
+ o_RDWR,
+ o_NOCTTY,
+ withFilePath
+ )
+import System.Posix.Types (CMode)
+import Text.Read (lex, Read, reads)
+import Text.Show (Show, show)
+import Foreign.C.Types (CInt)
+import Foreign.C.Error (Errno, eEXIST, getErrno, errnoToIOError)
+
+#if defined(mingw32_HOST_OS)
+import GHC.Base (undefined, not, (||), fmap)
+import GHC.List (any)
+import GHC.Num ((*))
+import GHC.IO (onException)
+import GHC.IO.SubSystem
+import GHC.IO.Windows.Handle (openFileAsTemp)
+import GHC.IO.Handle.Windows (mkHandleFromHANDLE)
+import GHC.IO.Device as IODevice
+import GHC.Internal.Real (fromIntegral)
+import Data.Bits ((.&.))
+import Foreign.C.Types (CUInt (CUInt), CWchar)
+import Foreign.C.String
+import Foreign.Ptr
+import Foreign.Marshal.Alloc
+import Foreign.Marshal.Utils (with)
+import Foreign.Storable
+#endif
+
+-----------------------------------------------------------------------------
+-- Standard IO
+
+-- | Write a character to the standard output device
+--
+-- 'putChar' is implemented as @'hPutChar' 'stdout'@.
+--
+-- This operation may fail with the same errors as 'hPutChar'.
+--
+-- ==== __Examples__
+--
+-- Note that the following do not put a newline.
+--
+-- >>> putChar 'x'
+-- x
+--
+-- >>> putChar '\0042'
+-- *
+putChar :: Char -> IO ()
+putChar c = hPutChar stdout c
+
+-- | Write a string to the standard output device
+--
+-- 'putStr' is implemented as @'hPutStr' 'stdout'@.
+--
+-- This operation may fail with the same errors, and has the same issues with concurrency, as 'hPutStr'!
+--
+-- ==== __Examples__
+--
+-- Note that the following do not put a newline.
+--
+-- >>> putStr "Hello, World!"
+-- Hello, World!
+--
+-- >>> putStr "\0052\0042\0050"
+-- 4*2
+--
+putStr :: String -> IO ()
+putStr s = hPutStr stdout s
+
+-- | Read a single character from the standard input device.
+--
+-- 'getChar' is implemented as @'hGetChar' 'stdin'@.
+--
+-- This operation may fail with the same errors as 'hGetChar'.
+--
+-- ==== __Examples__
+--
+-- >>> getChar
+-- a'a'
+--
+-- >>> getChar
+-- >
+-- '\n'
+getChar :: IO Char
+getChar = hGetChar stdin
+
+-- | Read a line from the standard input device.
+--
+-- 'getLine' is implemented as @'hGetLine' 'stdin'@.
+--
+-- This operation may fail with the same errors as 'hGetLine'.
+--
+-- ==== __Examples__
+--
+-- >>> getLine
+-- > Hello World!
+-- "Hello World!"
+--
+-- >>> getLine
+-- >
+-- ""
+getLine :: IO String
+getLine = hGetLine stdin
+
+-- | The 'getContents' operation returns all user input as a single string,
+-- which is read lazily as it is needed.
+--
+-- 'getContents' is implemented as @'hGetContents' 'stdin'@.
+--
+-- This operation may fail with the same errors as 'hGetContents'.
+--
+-- ==== __Examples__
+--
+-- >>> getContents >>= putStr
+-- > aaabbbccc :D
+-- aaabbbccc :D
+-- > I hope you have a great day
+-- I hope you have a great day
+-- > ^D
+--
+-- >>> getContents >>= print . length
+-- > abc
+-- > <3
+-- > def ^D
+-- 11
+getContents :: IO String
+getContents = hGetContents stdin
+
+-- | The 'getContents'' operation returns all user input as a single string,
+-- which is fully read before being returned
+--
+-- 'getContents'' is implemented as @'hGetContents'' 'stdin'@.
+--
+-- This operation may fail with the same errors as 'hGetContents''.
+--
+-- ==== __Examples__
+--
+-- >>> getContents' >>= putStr
+-- > aaabbbccc :D
+-- > I hope you have a great day
+-- aaabbbccc :D
+-- I hope you have a great day
+--
+-- >>> getContents' >>= print . length
+-- > abc
+-- > <3
+-- > def ^D
+-- 11
+--
+-- @since base-4.15.0.0
+getContents' :: IO String
+getContents' = hGetContents' stdin
+
+-- | @'interact' f@ takes the entire input from 'stdin' and applies @f@ to it.
+-- The resulting string is written to the 'stdout' device.
+--
+-- Note that this operation is lazy, which allows to produce output
+-- even before all input has been consumed.
+--
+-- This operation may fail with the same errors as 'getContents' and 'putStr'.
+--
+-- If it doesn't produce output the buffering settings may not be
+-- correct, use ^D (ctrl+D) to close stdin which forces
+-- the buffer to be consumed.
+--
+-- You may wish to set the buffering style appropriate to your program's
+-- needs before using this function, for example:
+--
+-- @
+-- main :: IO ()
+-- main = do
+-- hSetBuffering stdin LineBuffering
+-- hSetBuffering stdout NoBuffering
+-- interact (concatMap (\str -> str ++ str) . L.lines)
+-- @
+--
+-- ==== __Examples__
+--
+-- >>> interact (\str -> str ++ str)
+-- > hi :)
+-- hi :)
+-- > ^D
+-- hi :)
+--
+-- >>> interact (const ":D")
+-- :D
+--
+-- >>> interact (show . words)
+-- > hello world!
+-- > I hope you have a great day
+-- > ^D
+-- ["hello","world!","I","hope","you","have","a","great","day"]
+interact :: (String -> String) -> IO ()
+interact f = do s <- getContents
+ putStr (f s)
+
+-- | The 'readFile' function reads a file and
+-- returns the contents of the file as a string.
+--
+-- The file is read lazily, on demand, as with 'getContents'.
+--
+-- This operation may fail with the same errors as 'hGetContents' and 'openFile'.
+--
+-- ==== __Examples__
+--
+-- >>> readFile "~/hello_world"
+-- "Greetings!"
+--
+-- >>> take 5 <$> readFile "/dev/zero"
+-- "\NUL\NUL\NUL\NUL\NUL"
+readFile :: FilePath -> IO String
+readFile name = openFile name ReadMode >>= hGetContents
+
+-- | The 'readFile'' function reads a file and
+-- returns the contents of the file as a string.
+--
+-- This is identical to 'readFile', but the file is fully read before being returned,
+-- as with 'getContents''.
+--
+-- @since base-4.15.0.0
+readFile' :: FilePath -> IO String
+-- There's a bit of overkill here—both withFile and
+-- hGetContents' will close the file in the end.
+readFile' name = withFile name ReadMode hGetContents'
+
+-- | The computation @'writeFile' file str@ function writes the string @str@,
+-- to the file @file@.
+--
+-- This operation may fail with the same errors as 'hPutStr' and 'withFile'.
+--
+-- ==== __Examples__
+--
+-- >>> writeFile "hello" "world" >> readFile "hello"
+-- "world"
+--
+-- >>> writeFile "~/" "D:"
+-- *** Exception: ~/: withFile: inappropriate type (Is a directory)
+writeFile :: FilePath -> String -> IO ()
+writeFile f txt = withFile f WriteMode (\ hdl -> hPutStr hdl txt)
+
+-- | The computation @'appendFile' file str@ function appends the string @str@,
+-- to the file @file@.
+--
+-- Note that 'writeFile' and 'appendFile' write a literal string
+-- to a file. To write a value of any printable type, as with 'print',
+-- use the 'show' function to convert the value to a string first.
+--
+-- This operation may fail with the same errors as 'hPutStr' and 'withFile'.
+--
+-- ==== __Examples__
+--
+-- The following example could be more efficently written by acquiring a handle
+-- instead with 'openFile' and using the computations capable of writing to handles
+-- such as 'hPutStr'.
+--
+-- >>> let fn = "hello_world"
+-- >>> in writeFile fn "hello" >> appendFile fn " world!" >> (readFile fn >>= putStrLn)
+-- "hello world!"
+--
+-- >>> let fn = "foo"; output = readFile' fn >>= putStrLn
+-- >>> in output >> appendFile fn (show [1,2,3]) >> output
+-- this is what's in the file
+-- this is what's in the file[1,2,3]
+appendFile :: FilePath -> String -> IO ()
+appendFile f txt = withFile f AppendMode (\ hdl -> hPutStr hdl txt)
+
+-- | The 'readLn' function combines 'getLine' and 'readIO'.
+--
+-- This operation may fail with the same errors as 'getLine' and 'readIO'.
+--
+-- ==== __Examples__
+--
+-- >>> fmap (+ 5) readLn
+-- > 25
+-- 30
+--
+-- >>> readLn :: IO String
+-- > this is not a string literal
+-- *** Exception: user error (Prelude.readIO: no parse)
+readLn :: Read a => IO a
+readLn = getLine >>= readIO
+
+-- | The 'readIO' function is similar to 'read' except that it signals
+-- parse failure to the 'IO' monad instead of terminating the program.
+--
+-- This operation may fail with:
+--
+-- * 'GHC.Internal.System.IO.Error.isUserError' if there is no unambiguous parse.
+--
+-- ==== __Examples__
+--
+-- >>> fmap (+ 1) (readIO "1")
+-- 2
+--
+-- >>> readIO "not quite ()" :: IO ()
+-- *** Exception: user error (Prelude.readIO: no parse)
+readIO :: Read a => String -> IO a
+readIO s = case (do { (x,t) <- reads s ;
+ ("","") <- lex t ;
+ return x }) of
+ [x] -> return x
+ [] -> ioError (userError "Prelude.readIO: no parse")
+ _ -> ioError (userError "Prelude.readIO: ambiguous parse")
+
+-- | The encoding of the current locale.
+--
+-- This is the initial locale encoding: if it has been subsequently changed by
+-- 'GHC.Internal.IO.Encoding.setLocaleEncoding' this value will not reflect that change.
+localeEncoding :: TextEncoding
+localeEncoding = initLocaleEncoding
+
+-- | Computation 'hReady' @hdl@ indicates whether at least one item is
+-- available for input from handle @hdl@.
+--
+-- This operation may fail with:
+--
+-- * 'GHC.Internal.System.IO.Error.isEOFError' if the end of file has been reached.
+hReady :: Handle -> IO Bool
+hReady h = hWaitForInput h 0
+
+-- | Computation 'hPrint' @hdl t@ writes the string representation of @t@
+-- given by the 'show' function to the file or channel managed by @hdl@
+-- and appends a newline.
+--
+-- This operation may fail with the same errors as 'hPutStrLn'
+--
+-- ==== __Examples__
+--
+-- >>> hPrint stdout [1,2,3]
+-- [1,2,3]
+--
+-- >>> hPrint stdin [4,5,6]
+-- *** Exception: <stdin>: hPutStr: illegal operation (handle is not open for writing)
+hPrint :: Show a => Handle -> a -> IO ()
+hPrint hdl = hPutStrLn hdl . show
+
+-- | The function creates a temporary file in ReadWrite mode.
+-- The created file isn\'t deleted automatically, so you need to delete it manually.
+--
+-- The file is created with permissions such that only the current
+-- user can read\/write it.
+--
+-- With some exceptions (see below), the file will be created securely
+-- in the sense that an attacker should not be able to cause
+-- openTempFile to overwrite another file on the filesystem using your
+-- credentials, by putting symbolic links (on Unix) in the place where
+-- the temporary file is to be created. On Unix the @O_CREAT@ and
+-- @O_EXCL@ flags are used to prevent this attack, but note that
+-- @O_EXCL@ is sometimes not supported on NFS filesystems, so if you
+-- rely on this behaviour it is best to use local filesystems only.
+openTempFile :: FilePath -- ^ Directory in which to create the file
+ -> String -- ^ File name template. If the template is \"foo.ext\" then
+ -- the created file will be \"fooXXX.ext\" where XXX is some
+ -- random number. Note that this should not contain any path
+ -- separator characters. On Windows, the template prefix may
+ -- be truncated to 3 chars, e.g. \"foobar.ext\" will be
+ -- \"fooXXX.ext\".
+ -> IO (FilePath, Handle)
+openTempFile tmp_dir template
+ = openTempFile' "openTempFile" tmp_dir template False 0o600
+
+-- | Like 'openTempFile', but opens the file in binary mode. See 'openBinaryFile' for more comments.
+openBinaryTempFile :: FilePath -> String -> IO (FilePath, Handle)
+openBinaryTempFile tmp_dir template
+ = openTempFile' "openBinaryTempFile" tmp_dir template True 0o600
+
+-- | Like 'openTempFile', but uses the default file permissions
+openTempFileWithDefaultPermissions :: FilePath -> String
+ -> IO (FilePath, Handle)
+openTempFileWithDefaultPermissions tmp_dir template
+ = openTempFile' "openTempFileWithDefaultPermissions" tmp_dir template False 0o666
+
+-- | Like 'openBinaryTempFile', but uses the default file permissions
+openBinaryTempFileWithDefaultPermissions :: FilePath -> String
+ -> IO (FilePath, Handle)
+openBinaryTempFileWithDefaultPermissions tmp_dir template
+ = openTempFile' "openBinaryTempFileWithDefaultPermissions" tmp_dir template True 0o666
+
+openTempFile' :: String -> FilePath -> String -> Bool -> CMode
+ -> IO (FilePath, Handle)
+openTempFile' loc tmp_dir template binary mode
+ | pathSeparator template
+ = failIO $ "openTempFile': Template string must not contain path separator characters: "++template
+ | otherwise = findTempName
+ where
+ -- We split off the last extension, so we can use .foo.ext files
+ -- for temporary files (hidden on Unix OSes). Unfortunately we're
+ -- below filepath in the hierarchy here.
+ (prefix, suffix) =
+ case break (== '.') $ reverse template of
+ -- First case: template contains no '.'s. Just re-reverse it.
+ (rev_suffix, "") -> (reverse rev_suffix, "")
+ -- Second case: template contains at least one '.'. Strip the
+ -- dot from the prefix and prepend it to the suffix (if we don't
+ -- do this, the unique number will get added after the '.' and
+ -- thus be part of the extension, which is wrong.)
+ (rev_suffix, '.':rest) -> (reverse rest, '.':reverse rev_suffix)
+ -- Otherwise, something is wrong, because (break (== '.')) should
+ -- always return a pair with either the empty string or a string
+ -- beginning with '.' as the second component.
+ _ -> errorWithoutStackTrace "bug in GHC.Internal.System.IO.openTempFile"
+#if defined(mingw32_HOST_OS)
+ findTempName = findTempNamePosix <!> findTempNameWinIO
+
+ findTempNameWinIO = do
+ let label = if null prefix then "ghc" else prefix
+ withCWString tmp_dir $ \c_tmp_dir ->
+ withCWString label $ \c_template ->
+ withCWString suffix $ \c_suffix ->
+ with nullPtr $ \c_ptr -> do
+ res <- c_createUUIDTempFileErrNo c_tmp_dir c_template c_suffix c_ptr
+ if not res
+ then do errno <- getErrno
+ ioError (errnoToIOError loc errno Nothing (Just tmp_dir))
+ else do c_p <- peek c_ptr
+ filename <- peekCWString c_p
+ free c_p
+ let flags = fromIntegral mode .&. o_EXCL
+ handleResultsWinIO filename (flags == o_EXCL)
+
+ findTempNamePosix = do
+ let label = if null prefix then "ghc" else prefix
+ withCWString tmp_dir $ \c_tmp_dir ->
+ withCWString label $ \c_template ->
+ withCWString suffix $ \c_suffix ->
+ allocaBytes (sizeOf (undefined :: CWchar) * 260) $ \c_str -> do
+ res <- c_getTempFileNameErrorNo c_tmp_dir c_template c_suffix 0
+ c_str
+ if not res
+ then do errno <- getErrno
+ ioError (errnoToIOError loc errno Nothing (Just tmp_dir))
+ else do filename <- peekCWString c_str
+ handleResultsPosix filename
+
+ handleResultsPosix filename = do
+ let oflags1 = rw_flags .|. o_EXCL
+ binary_flags
+ | binary = o_BINARY
+ | otherwise = 0
+ oflags = oflags1 .|. binary_flags
+ fd <- withFilePath filename $ \ f -> c_open f oflags mode
+ case fd < 0 of
+ True -> do errno <- getErrno
+ ioError (errnoToIOError loc errno Nothing (Just tmp_dir))
+ False ->
+ do (fD,fd_type) <- FD.mkFD fd ReadWriteMode Nothing{-no stat-}
+ False{-is_socket-}
+ True{-is_nonblock-}
+
+ enc <- getLocaleEncoding
+ h <- POSIX.mkHandleFromFD fD fd_type filename ReadWriteMode
+ False{-set non-block-} (Just enc)
+
+ return (filename, h)
+
+ handleResultsWinIO filename excl = do
+ (hwnd, hwnd_type) <- openFileAsTemp filename True excl
+ mb_codec <- if binary then return Nothing else fmap Just getLocaleEncoding
+
+ -- then use it to make a Handle
+ h <- mkHandleFromHANDLE hwnd hwnd_type filename ReadWriteMode mb_codec
+ `onException` IODevice.close hwnd
+ return (filename, h)
+
+foreign import ccall "getTempFileNameErrorNo" c_getTempFileNameErrorNo
+ :: CWString -> CWString -> CWString -> CUInt -> Ptr CWchar -> IO Bool
+
+foreign import ccall "__createUUIDTempFileErrNo" c_createUUIDTempFileErrNo
+ :: CWString -> CWString -> CWString -> Ptr CWString -> IO Bool
+
+pathSeparator :: String -> Bool
+pathSeparator template = any (\x-> x == '/' || x == '\\') template
+
+output_flags = std_flags
+#else /* else mingw32_HOST_OS */
+ findTempName = do
+ rs <- rand_string
+ let filename = prefix ++ rs ++ suffix
+ filepath = tmp_dir `combine` filename
+ r <- openNewFile filepath binary mode
+ case r of
+ FileExists -> findTempName
+ OpenNewError errno -> ioError (errnoToIOError loc errno Nothing (Just tmp_dir))
+ NewFileCreated fd -> do
+ (fD,fd_type) <- FD.mkFD fd ReadWriteMode Nothing{-no stat-}
+ False{-is_socket-}
+ True{-is_nonblock-}
+
+ enc <- getLocaleEncoding
+ h <- POSIX.mkHandleFromFD fD fd_type filepath ReadWriteMode False{-set non-block-} (Just enc)
+
+ return (filepath, h)
+
+ where
+ {-
+ The following code is inspired by code from 'System.FilePath', since
+ that code is not available here.
+ -}
+ combine path1 []
+ = path1
+ combine path1 path2
+ = case unsnoc path1 of
+ Nothing
+ -> path2
+ Just (_, path1Last)
+ | pathSeparator [path1Last]
+ -> path1 ++ path2
+ | otherwise
+ -> path1 ++ [pathSeparatorChar] ++ path2
+
+tempCounter :: IORef Int
+tempCounter = unsafePerformIO $ newIORef 0
+{-# NOINLINE tempCounter #-}
+
+-- build large digit-alike number
+rand_string :: IO String
+rand_string = do
+ r1 <- c_getpid
+ (r2, _) <- atomicModifyIORef'_ tempCounter (+1)
+ return $ show r1 ++ "-" ++ show r2
+
+data OpenNewFileResult
+ = NewFileCreated CInt
+ | FileExists
+ | OpenNewError Errno
+
+openNewFile :: FilePath -> Bool -> CMode -> IO OpenNewFileResult
+openNewFile filepath binary mode = do
+ let oflags1 = rw_flags .|. o_EXCL
+
+ binary_flags
+ | binary = o_BINARY
+ | otherwise = 0
+
+ oflags = oflags1 .|. binary_flags
+ fd <- withFilePath filepath $ \ f ->
+ c_open f oflags mode
+ if fd < 0
+ then do
+ errno <- getErrno
+ case errno of
+ _ | errno == eEXIST -> return FileExists
+ _ -> return (OpenNewError errno)
+ else return (NewFileCreated fd)
+
+-- XXX Should use filepath library
+pathSeparatorChar :: Char
+pathSeparatorChar = '/'
+
+pathSeparator :: String -> Bool
+pathSeparator template = pathSeparatorChar `elem` template
+
+output_flags = std_flags .|. o_CREAT
+#endif /* mingw32_HOST_OS */
+
+-- XXX Copied from GHC.Handle
+std_flags, output_flags, rw_flags :: CInt
+std_flags = o_NONBLOCK .|. o_NOCTTY
+rw_flags = output_flags .|. o_RDWR
-- $locking
-- Implementations should enforce as far as possible, at least locally to the
=====================================
libraries/base/src/Text/Printf.hs
=====================================
@@ -99,7 +99,7 @@ import GHC.Internal.Data.List (stripPrefix)
import GHC.Internal.Word
import GHC.Internal.Numeric
import GHC.Internal.Numeric.Natural
-import GHC.Internal.System.IO
+import System.IO
-- $setup
-- >>> import Prelude
=====================================
libraries/ghc-internal/src/GHC/Internal/System/IO.hs
=====================================
@@ -1,6 +1,4 @@
{-# LANGUAGE Trustworthy #-}
-{-# LANGUAGE CPP, NoImplicitPrelude, CApiFFI #-}
-{-# OPTIONS_GHC -Wno-x-partial #-}
-----------------------------------------------------------------------------
-- |
@@ -16,293 +14,13 @@
--
-----------------------------------------------------------------------------
-module GHC.Internal.System.IO (
- -- * The IO monad
+module GHC.Internal.System.IO (putStrLn, print) where
- IO,
-
- -- * Files and handles
-
- FilePath,
-
- Handle, -- abstract, instance of: Eq, Show.
-
- -- | GHC note: a 'Handle' will be automatically closed when the garbage
- -- collector detects that it has become unreferenced by the program.
- -- However, relying on this behaviour is not generally recommended:
- -- the garbage collector is unpredictable. If possible, use
- -- an explicit 'hClose' to close 'Handle's when they are no longer
- -- required. GHC does not currently attempt to free up file
- -- descriptors when they have run out, it is your responsibility to
- -- ensure that this doesn't happen.
-
- -- ** Standard handles
-
- -- | Three handles are allocated during program initialisation,
- -- and are initially open.
-
- stdin, stdout, stderr,
-
- -- * Opening and closing files
-
- -- ** Opening files
-
- withFile,
- openFile,
- IOMode(ReadMode,WriteMode,AppendMode,ReadWriteMode),
-
- -- ** Closing files
-
- hClose,
-
- -- ** Special cases
-
- -- | These functions are also exported by the "Prelude".
-
- readFile,
- readFile',
- writeFile,
- appendFile,
-
- -- * Operations on handles
-
- -- ** Determining and changing the size of a file
-
- hFileSize,
- hSetFileSize,
-
- -- ** Detecting the end of input
-
- hIsEOF,
- isEOF,
-
- -- ** Buffering operations
-
- BufferMode(NoBuffering,LineBuffering,BlockBuffering),
- hSetBuffering,
- hGetBuffering,
- hFlush,
-
- -- ** Repositioning handles
-
- hGetPosn,
- hSetPosn,
- HandlePosn, -- abstract, instance of: Eq, Show.
-
- hSeek,
- SeekMode(AbsoluteSeek,RelativeSeek,SeekFromEnd),
- hTell,
-
- -- ** Handle properties
-
- hIsOpen, hIsClosed,
- hIsReadable, hIsWritable,
- hIsSeekable,
-
- -- ** Terminal operations (not portable: GHC only)
-
- hIsTerminalDevice,
-
- hSetEcho,
- hGetEcho,
-
- -- ** Showing handle state (not portable: GHC only)
-
- hShow,
-
- -- * Text input and output
-
- -- ** Text input
-
- hWaitForInput,
- hReady,
- hGetChar,
- hGetLine,
- hLookAhead,
- hGetContents,
- hGetContents',
-
- -- ** Text output
-
- hPutChar,
- hPutStr,
- hPutStrLn,
- hPrint,
-
- -- ** Special cases for standard input and output
-
- -- | These functions are also exported by the "Prelude".
-
- interact,
- putChar,
- putStr,
- putStrLn,
- print,
- getChar,
- getLine,
- getContents,
- getContents',
- readIO,
- readLn,
-
- -- * Binary input and output
-
- withBinaryFile,
- openBinaryFile,
- hSetBinaryMode,
- hPutBuf,
- hGetBuf,
- hGetBufSome,
- hPutBufNonBlocking,
- hGetBufNonBlocking,
-
- -- * Temporary files
-
- openTempFile,
- openBinaryTempFile,
- openTempFileWithDefaultPermissions,
- openBinaryTempFileWithDefaultPermissions,
-
- -- * Unicode encoding\/decoding
-
- -- | A text-mode 'Handle' has an associated 'TextEncoding', which
- -- is used to decode bytes into Unicode characters when reading,
- -- and encode Unicode characters into bytes when writing.
- --
- -- The default 'TextEncoding' is the same as the default encoding
- -- on your system, which is also available as 'localeEncoding'.
- -- (GHC note: on Windows, we currently do not support double-byte
- -- encodings; if the console\'s code page is unsupported, then
- -- 'localeEncoding' will be 'latin1'.)
- --
- -- Encoding and decoding errors are always detected and reported,
- -- except during lazy I/O ('hGetContents', 'getContents', and
- -- 'readFile'), where a decoding error merely results in
- -- termination of the character stream, as with other I/O errors.
-
- hSetEncoding,
- hGetEncoding,
-
- -- ** Unicode encodings
- TextEncoding,
- latin1,
- utf8, utf8_bom,
- utf16, utf16le, utf16be,
- utf32, utf32le, utf32be,
- localeEncoding,
- char8,
- mkTextEncoding,
-
- -- * Newline conversion
-
- -- | In Haskell, a newline is always represented by the character
- -- @\'\\n\'@. However, in files and external character streams, a
- -- newline may be represented by another character sequence, such
- -- as @\'\\r\\n\'@.
- --
- -- A text-mode 'Handle' has an associated 'NewlineMode' that
- -- specifies how to translate newline characters. The
- -- 'NewlineMode' specifies the input and output translation
- -- separately, so that for instance you can translate @\'\\r\\n\'@
- -- to @\'\\n\'@ on input, but leave newlines as @\'\\n\'@ on output.
- --
- -- The default 'NewlineMode' for a 'Handle' is
- -- 'nativeNewlineMode', which does no translation on Unix systems,
- -- but translates @\'\\r\\n\'@ to @\'\\n\'@ and back on Windows.
- --
- -- Binary-mode 'Handle's do no newline translation at all.
- --
- hSetNewlineMode,
- hGetNewlineMode,
- Newline(..), nativeNewline,
- NewlineMode(..),
- noNewlineTranslation, universalNewlineMode, nativeNewlineMode,
- ) where
-
-import GHC.Internal.Control.Exception.Base
-
-import GHC.Internal.Classes (Eq(..), Ord(..))
-import GHC.Internal.Data.Bits
-import GHC.Internal.Data.Maybe
-import GHC.Internal.Err (errorWithoutStackTrace)
-import GHC.Internal.Foreign.C.Error
-#if defined(mingw32_HOST_OS)
-import GHC.Internal.Base (fmap)
-import GHC.Internal.Classes (not, (||))
-import GHC.Internal.Err (undefined)
-import GHC.Internal.Foreign.C.String
-import GHC.Internal.Foreign.Ptr
-import GHC.Internal.Foreign.Marshal.Alloc
-import GHC.Internal.Foreign.Marshal.Utils (with)
-import GHC.Internal.Foreign.Storable
-import GHC.Internal.IO.SubSystem
-import GHC.Internal.IO.Windows.Handle (openFileAsTemp)
-import GHC.Internal.IO.Handle.Windows (mkHandleFromHANDLE)
-import GHC.Internal.IO.Device as IODevice
-import GHC.Internal.Real (fromIntegral)
-#endif
-import GHC.Internal.Foreign.C.Types
-import GHC.Internal.System.Posix.Internals
-import GHC.Internal.System.Posix.Types
-
-import GHC.Internal.Base (String, failIO, otherwise, return, ($), (.), (>>=))
-import GHC.Internal.List
-#if !defined(mingw32_HOST_OS)
-import GHC.Internal.IORef
-import GHC.Internal.Types (Int)
-#endif
-import GHC.Internal.Num
-import GHC.Internal.IO hiding ( bracket, onException )
-import GHC.Internal.IO.IOMode
-import qualified GHC.Internal.IO.FD as FD
-import GHC.Internal.IO.Handle
-import qualified GHC.Internal.IO.Handle.FD as POSIX
-import GHC.Internal.IO.Handle.Text ( hGetBufSome, hPutStrLn )
-import GHC.Internal.IO.Exception ( userError )
-import GHC.Internal.IO.Encoding
-import GHC.Internal.Text.Read
-import GHC.Internal.IO.StdHandles
-import GHC.Internal.Show
-import GHC.Internal.Types (Bool(..), Char)
------------------------------------------------------------------------------
--- Standard IO
-
--- | Write a character to the standard output device
---
--- 'putChar' is implemented as @'hPutChar' 'stdout'@.
---
--- This operation may fail with the same errors as 'hPutChar'.
---
--- ==== __Examples__
---
--- Note that the following do not put a newline.
---
--- >>> putChar 'x'
--- x
---
--- >>> putChar '\0042'
--- *
-putChar :: Char -> IO ()
-putChar c = hPutChar stdout c
-
--- | Write a string to the standard output device
---
--- 'putStr' is implemented as @'hPutStr' 'stdout'@.
---
--- This operation may fail with the same errors, and has the same issues with concurrency, as 'hPutStr'!
---
--- ==== __Examples__
---
--- Note that the following do not put a newline.
---
--- >>> putStr "Hello, World!"
--- Hello, World!
---
--- >>> putStr "\0052\0042\0050"
--- 4*2
---
-putStr :: String -> IO ()
-putStr s = hPutStr stdout s
+import GHC.Internal.Base (String)
+import GHC.Internal.IO (IO)
+import GHC.Internal.IO.Handle.Text (hPutStrLn)
+import GHC.Internal.IO.StdHandles (stdout)
+import GHC.Internal.Show (Show, show)
-- | The same as 'putStr', but adds a newline character.
--
@@ -339,485 +57,3 @@ putStrLn s = hPutStrLn stdout s
-- [(0,1),(1,2),(2,4),(3,8),(4,16),(5,32),(6,64),(7,128),(8,256)]
print :: Show a => a -> IO ()
print x = putStrLn (show x)
-
--- | Read a single character from the standard input device.
---
--- 'getChar' is implemented as @'hGetChar' 'stdin'@.
---
--- This operation may fail with the same errors as 'hGetChar'.
---
--- ==== __Examples__
---
--- >>> getChar
--- a'a'
---
--- >>> getChar
--- >
--- '\n'
-getChar :: IO Char
-getChar = hGetChar stdin
-
--- | Read a line from the standard input device.
---
--- 'getLine' is implemented as @'hGetLine' 'stdin'@.
---
--- This operation may fail with the same errors as 'hGetLine'.
---
--- ==== __Examples__
---
--- >>> getLine
--- > Hello World!
--- "Hello World!"
---
--- >>> getLine
--- >
--- ""
-getLine :: IO String
-getLine = hGetLine stdin
-
--- | The 'getContents' operation returns all user input as a single string,
--- which is read lazily as it is needed.
---
--- 'getContents' is implemented as @'hGetContents' 'stdin'@.
---
--- This operation may fail with the same errors as 'hGetContents'.
---
--- ==== __Examples__
---
--- >>> getContents >>= putStr
--- > aaabbbccc :D
--- aaabbbccc :D
--- > I hope you have a great day
--- I hope you have a great day
--- > ^D
---
--- >>> getContents >>= print . length
--- > abc
--- > <3
--- > def ^D
--- 11
-getContents :: IO String
-getContents = hGetContents stdin
-
--- | The 'getContents'' operation returns all user input as a single string,
--- which is fully read before being returned
---
--- 'getContents'' is implemented as @'hGetContents'' 'stdin'@.
---
--- This operation may fail with the same errors as 'hGetContents''.
---
--- ==== __Examples__
---
--- >>> getContents' >>= putStr
--- > aaabbbccc :D
--- > I hope you have a great day
--- aaabbbccc :D
--- I hope you have a great day
---
--- >>> getContents' >>= print . length
--- > abc
--- > <3
--- > def ^D
--- 11
---
--- @since base-4.15.0.0
-getContents' :: IO String
-getContents' = hGetContents' stdin
-
--- | @'interact' f@ takes the entire input from 'stdin' and applies @f@ to it.
--- The resulting string is written to the 'stdout' device.
---
--- Note that this operation is lazy, which allows to produce output
--- even before all input has been consumed.
---
--- This operation may fail with the same errors as 'getContents' and 'putStr'.
---
--- If it doesn't produce output the buffering settings may not be
--- correct, use ^D (ctrl+D) to close stdin which forces
--- the buffer to be consumed.
---
--- You may wish to set the buffering style appropriate to your program's
--- needs before using this function, for example:
---
--- @
--- main :: IO ()
--- main = do
--- hSetBuffering stdin LineBuffering
--- hSetBuffering stdout NoBuffering
--- interact (concatMap (\str -> str ++ str) . L.lines)
--- @
---
--- ==== __Examples__
---
--- >>> interact (\str -> str ++ str)
--- > hi :)
--- hi :)
--- > ^D
--- hi :)
---
--- >>> interact (const ":D")
--- :D
---
--- >>> interact (show . words)
--- > hello world!
--- > I hope you have a great day
--- > ^D
--- ["hello","world!","I","hope","you","have","a","great","day"]
-interact :: (String -> String) -> IO ()
-interact f = do s <- getContents
- putStr (f s)
-
--- | The 'readFile' function reads a file and
--- returns the contents of the file as a string.
---
--- The file is read lazily, on demand, as with 'getContents'.
---
--- This operation may fail with the same errors as 'hGetContents' and 'openFile'.
---
--- ==== __Examples__
---
--- >>> readFile "~/hello_world"
--- "Greetings!"
---
--- >>> take 5 <$> readFile "/dev/zero"
--- "\NUL\NUL\NUL\NUL\NUL"
-readFile :: FilePath -> IO String
-readFile name = openFile name ReadMode >>= hGetContents
-
--- | The 'readFile'' function reads a file and
--- returns the contents of the file as a string.
---
--- This is identical to 'readFile', but the file is fully read before being returned,
--- as with 'getContents''.
---
--- @since base-4.15.0.0
-readFile' :: FilePath -> IO String
--- There's a bit of overkill here—both withFile and
--- hGetContents' will close the file in the end.
-readFile' name = withFile name ReadMode hGetContents'
-
--- | The computation @'writeFile' file str@ function writes the string @str@,
--- to the file @file@.
---
--- This operation may fail with the same errors as 'hPutStr' and 'withFile'.
---
--- ==== __Examples__
---
--- >>> writeFile "hello" "world" >> readFile "hello"
--- "world"
---
--- >>> writeFile "~/" "D:"
--- *** Exception: ~/: withFile: inappropriate type (Is a directory)
-writeFile :: FilePath -> String -> IO ()
-writeFile f txt = withFile f WriteMode (\ hdl -> hPutStr hdl txt)
-
--- | The computation @'appendFile' file str@ function appends the string @str@,
--- to the file @file@.
---
--- Note that 'writeFile' and 'appendFile' write a literal string
--- to a file. To write a value of any printable type, as with 'print',
--- use the 'show' function to convert the value to a string first.
---
--- This operation may fail with the same errors as 'hPutStr' and 'withFile'.
---
--- ==== __Examples__
---
--- The following example could be more efficently written by acquiring a handle
--- instead with 'openFile' and using the computations capable of writing to handles
--- such as 'hPutStr'.
---
--- >>> let fn = "hello_world"
--- >>> in writeFile fn "hello" >> appendFile fn " world!" >> (readFile fn >>= putStrLn)
--- "hello world!"
---
--- >>> let fn = "foo"; output = readFile' fn >>= putStrLn
--- >>> in output >> appendFile fn (show [1,2,3]) >> output
--- this is what's in the file
--- this is what's in the file[1,2,3]
-appendFile :: FilePath -> String -> IO ()
-appendFile f txt = withFile f AppendMode (\ hdl -> hPutStr hdl txt)
-
--- | The 'readLn' function combines 'getLine' and 'readIO'.
---
--- This operation may fail with the same errors as 'getLine' and 'readIO'.
---
--- ==== __Examples__
---
--- >>> fmap (+ 5) readLn
--- > 25
--- 30
---
--- >>> readLn :: IO String
--- > this is not a string literal
--- *** Exception: user error (Prelude.readIO: no parse)
-readLn :: Read a => IO a
-readLn = getLine >>= readIO
-
--- | The 'readIO' function is similar to 'read' except that it signals
--- parse failure to the 'IO' monad instead of terminating the program.
---
--- This operation may fail with:
---
--- * 'GHC.Internal.System.IO.Error.isUserError' if there is no unambiguous parse.
---
--- ==== __Examples__
---
--- >>> fmap (+ 1) (readIO "1")
--- 2
---
--- >>> readIO "not quite ()" :: IO ()
--- *** Exception: user error (Prelude.readIO: no parse)
-readIO :: Read a => String -> IO a
-readIO s = case (do { (x,t) <- reads s ;
- ("","") <- lex t ;
- return x }) of
- [x] -> return x
- [] -> ioError (userError "Prelude.readIO: no parse")
- _ -> ioError (userError "Prelude.readIO: ambiguous parse")
-
--- | The encoding of the current locale.
---
--- This is the initial locale encoding: if it has been subsequently changed by
--- 'GHC.Internal.IO.Encoding.setLocaleEncoding' this value will not reflect that change.
-localeEncoding :: TextEncoding
-localeEncoding = initLocaleEncoding
-
--- | Computation 'hReady' @hdl@ indicates whether at least one item is
--- available for input from handle @hdl@.
---
--- This operation may fail with:
---
--- * 'GHC.Internal.System.IO.Error.isEOFError' if the end of file has been reached.
-hReady :: Handle -> IO Bool
-hReady h = hWaitForInput h 0
-
--- | Computation 'hPrint' @hdl t@ writes the string representation of @t@
--- given by the 'show' function to the file or channel managed by @hdl@
--- and appends a newline.
---
--- This operation may fail with the same errors as 'hPutStrLn'
---
--- ==== __Examples__
---
--- >>> hPrint stdout [1,2,3]
--- [1,2,3]
---
--- >>> hPrint stdin [4,5,6]
--- *** Exception: <stdin>: hPutStr: illegal operation (handle is not open for writing)
-hPrint :: Show a => Handle -> a -> IO ()
-hPrint hdl = hPutStrLn hdl . show
-
--- | The function creates a temporary file in ReadWrite mode.
--- The created file isn\'t deleted automatically, so you need to delete it manually.
---
--- The file is created with permissions such that only the current
--- user can read\/write it.
---
--- With some exceptions (see below), the file will be created securely
--- in the sense that an attacker should not be able to cause
--- openTempFile to overwrite another file on the filesystem using your
--- credentials, by putting symbolic links (on Unix) in the place where
--- the temporary file is to be created. On Unix the @O_CREAT@ and
--- @O_EXCL@ flags are used to prevent this attack, but note that
--- @O_EXCL@ is sometimes not supported on NFS filesystems, so if you
--- rely on this behaviour it is best to use local filesystems only.
-openTempFile :: FilePath -- ^ Directory in which to create the file
- -> String -- ^ File name template. If the template is \"foo.ext\" then
- -- the created file will be \"fooXXX.ext\" where XXX is some
- -- random number. Note that this should not contain any path
- -- separator characters. On Windows, the template prefix may
- -- be truncated to 3 chars, e.g. \"foobar.ext\" will be
- -- \"fooXXX.ext\".
- -> IO (FilePath, Handle)
-openTempFile tmp_dir template
- = openTempFile' "openTempFile" tmp_dir template False 0o600
-
--- | Like 'openTempFile', but opens the file in binary mode. See 'openBinaryFile' for more comments.
-openBinaryTempFile :: FilePath -> String -> IO (FilePath, Handle)
-openBinaryTempFile tmp_dir template
- = openTempFile' "openBinaryTempFile" tmp_dir template True 0o600
-
--- | Like 'openTempFile', but uses the default file permissions
-openTempFileWithDefaultPermissions :: FilePath -> String
- -> IO (FilePath, Handle)
-openTempFileWithDefaultPermissions tmp_dir template
- = openTempFile' "openTempFileWithDefaultPermissions" tmp_dir template False 0o666
-
--- | Like 'openBinaryTempFile', but uses the default file permissions
-openBinaryTempFileWithDefaultPermissions :: FilePath -> String
- -> IO (FilePath, Handle)
-openBinaryTempFileWithDefaultPermissions tmp_dir template
- = openTempFile' "openBinaryTempFileWithDefaultPermissions" tmp_dir template True 0o666
-
-openTempFile' :: String -> FilePath -> String -> Bool -> CMode
- -> IO (FilePath, Handle)
-openTempFile' loc tmp_dir template binary mode
- | pathSeparator template
- = failIO $ "openTempFile': Template string must not contain path separator characters: "++template
- | otherwise = findTempName
- where
- -- We split off the last extension, so we can use .foo.ext files
- -- for temporary files (hidden on Unix OSes). Unfortunately we're
- -- below filepath in the hierarchy here.
- (prefix, suffix) =
- case break (== '.') $ reverse template of
- -- First case: template contains no '.'s. Just re-reverse it.
- (rev_suffix, "") -> (reverse rev_suffix, "")
- -- Second case: template contains at least one '.'. Strip the
- -- dot from the prefix and prepend it to the suffix (if we don't
- -- do this, the unique number will get added after the '.' and
- -- thus be part of the extension, which is wrong.)
- (rev_suffix, '.':rest) -> (reverse rest, '.':reverse rev_suffix)
- -- Otherwise, something is wrong, because (break (== '.')) should
- -- always return a pair with either the empty string or a string
- -- beginning with '.' as the second component.
- _ -> errorWithoutStackTrace "bug in GHC.Internal.System.IO.openTempFile"
-#if defined(mingw32_HOST_OS)
- findTempName = findTempNamePosix <!> findTempNameWinIO
-
- findTempNameWinIO = do
- let label = if null prefix then "ghc" else prefix
- withCWString tmp_dir $ \c_tmp_dir ->
- withCWString label $ \c_template ->
- withCWString suffix $ \c_suffix ->
- with nullPtr $ \c_ptr -> do
- res <- c_createUUIDTempFileErrNo c_tmp_dir c_template c_suffix c_ptr
- if not res
- then do errno <- getErrno
- ioError (errnoToIOError loc errno Nothing (Just tmp_dir))
- else do c_p <- peek c_ptr
- filename <- peekCWString c_p
- free c_p
- let flags = fromIntegral mode .&. o_EXCL
- handleResultsWinIO filename (flags == o_EXCL)
-
- findTempNamePosix = do
- let label = if null prefix then "ghc" else prefix
- withCWString tmp_dir $ \c_tmp_dir ->
- withCWString label $ \c_template ->
- withCWString suffix $ \c_suffix ->
- allocaBytes (sizeOf (undefined :: CWchar) * 260) $ \c_str -> do
- res <- c_getTempFileNameErrorNo c_tmp_dir c_template c_suffix 0
- c_str
- if not res
- then do errno <- getErrno
- ioError (errnoToIOError loc errno Nothing (Just tmp_dir))
- else do filename <- peekCWString c_str
- handleResultsPosix filename
-
- handleResultsPosix filename = do
- let oflags1 = rw_flags .|. o_EXCL
- binary_flags
- | binary = o_BINARY
- | otherwise = 0
- oflags = oflags1 .|. binary_flags
- fd <- withFilePath filename $ \ f -> c_open f oflags mode
- case fd < 0 of
- True -> do errno <- getErrno
- ioError (errnoToIOError loc errno Nothing (Just tmp_dir))
- False ->
- do (fD,fd_type) <- FD.mkFD fd ReadWriteMode Nothing{-no stat-}
- False{-is_socket-}
- True{-is_nonblock-}
-
- enc <- getLocaleEncoding
- h <- POSIX.mkHandleFromFD fD fd_type filename ReadWriteMode
- False{-set non-block-} (Just enc)
-
- return (filename, h)
-
- handleResultsWinIO filename excl = do
- (hwnd, hwnd_type) <- openFileAsTemp filename True excl
- mb_codec <- if binary then return Nothing else fmap Just getLocaleEncoding
-
- -- then use it to make a Handle
- h <- mkHandleFromHANDLE hwnd hwnd_type filename ReadWriteMode mb_codec
- `onException` IODevice.close hwnd
- return (filename, h)
-
-foreign import ccall "getTempFileNameErrorNo" c_getTempFileNameErrorNo
- :: CWString -> CWString -> CWString -> CUInt -> Ptr CWchar -> IO Bool
-
-foreign import ccall "__createUUIDTempFileErrNo" c_createUUIDTempFileErrNo
- :: CWString -> CWString -> CWString -> Ptr CWString -> IO Bool
-
-pathSeparator :: String -> Bool
-pathSeparator template = any (\x-> x == '/' || x == '\\') template
-
-output_flags = std_flags
-#else /* else mingw32_HOST_OS */
- findTempName = do
- rs <- rand_string
- let filename = prefix ++ rs ++ suffix
- filepath = tmp_dir `combine` filename
- r <- openNewFile filepath binary mode
- case r of
- FileExists -> findTempName
- OpenNewError errno -> ioError (errnoToIOError loc errno Nothing (Just tmp_dir))
- NewFileCreated fd -> do
- (fD,fd_type) <- FD.mkFD fd ReadWriteMode Nothing{-no stat-}
- False{-is_socket-}
- True{-is_nonblock-}
-
- enc <- getLocaleEncoding
- h <- POSIX.mkHandleFromFD fD fd_type filepath ReadWriteMode False{-set non-block-} (Just enc)
-
- return (filepath, h)
-
- where
- -- XXX bits copied from System.FilePath, since that's not available here
- combine a b
- | null b = a
- | null a = b
- | pathSeparator [last a] = a ++ b
- | otherwise = a ++ [pathSeparatorChar] ++ b
-
-tempCounter :: IORef Int
-tempCounter = unsafePerformIO $ newIORef 0
-{-# NOINLINE tempCounter #-}
-
--- build large digit-alike number
-rand_string :: IO String
-rand_string = do
- r1 <- c_getpid
- (r2, _) <- atomicModifyIORef'_ tempCounter (+1)
- return $ show r1 ++ "-" ++ show r2
-
-data OpenNewFileResult
- = NewFileCreated CInt
- | FileExists
- | OpenNewError Errno
-
-openNewFile :: FilePath -> Bool -> CMode -> IO OpenNewFileResult
-openNewFile filepath binary mode = do
- let oflags1 = rw_flags .|. o_EXCL
-
- binary_flags
- | binary = o_BINARY
- | otherwise = 0
-
- oflags = oflags1 .|. binary_flags
- fd <- withFilePath filepath $ \ f ->
- c_open f oflags mode
- if fd < 0
- then do
- errno <- getErrno
- case errno of
- _ | errno == eEXIST -> return FileExists
- _ -> return (OpenNewError errno)
- else return (NewFileCreated fd)
-
--- XXX Should use filepath library
-pathSeparatorChar :: Char
-pathSeparatorChar = '/'
-
-pathSeparator :: String -> Bool
-pathSeparator template = pathSeparatorChar `elem` template
-
-output_flags = std_flags .|. o_CREAT
-#endif /* mingw32_HOST_OS */
-
--- XXX Copied from GHC.Handle
-std_flags, output_flags, rw_flags :: CInt
-std_flags = o_NONBLOCK .|. o_NOCTTY
-rw_flags = output_flags .|. o_RDWR
=====================================
testsuite/tests/interface-stability/base-exports.stdout
=====================================
@@ -7848,6 +7848,7 @@ module GHC.IO.Handle where
hGetEcho :: Handle -> GHC.Internal.Types.IO GHC.Internal.Types.Bool
hGetEncoding :: Handle -> GHC.Internal.Types.IO (GHC.Internal.Maybe.Maybe GHC.Internal.IO.Encoding.Types.TextEncoding)
hGetLine :: Handle -> GHC.Internal.Types.IO GHC.Internal.Base.String
+ hGetNewlineMode :: Handle -> GHC.Internal.Types.IO NewlineMode
hGetPosn :: Handle -> GHC.Internal.Types.IO HandlePosn
hIsClosed :: Handle -> GHC.Internal.Types.IO GHC.Internal.Types.Bool
hIsEOF :: Handle -> GHC.Internal.Types.IO GHC.Internal.Types.Bool
@@ -9883,7 +9884,7 @@ module System.Exit where
exitWith :: forall a. ExitCode -> GHC.Internal.Types.IO a
module System.IO where
- -- Safety: Safe
+ -- Safety: Trustworthy
type BufferMode :: *
data BufferMode = NoBuffering | LineBuffering | BlockBuffering (GHC.Internal.Maybe.Maybe GHC.Internal.Types.Int)
type FilePath :: *
=====================================
testsuite/tests/interface-stability/base-exports.stdout-javascript-unknown-ghcjs
=====================================
@@ -7820,6 +7820,7 @@ module GHC.IO.Handle where
hGetEcho :: Handle -> GHC.Internal.Types.IO GHC.Internal.Types.Bool
hGetEncoding :: Handle -> GHC.Internal.Types.IO (GHC.Internal.Maybe.Maybe GHC.Internal.IO.Encoding.Types.TextEncoding)
hGetLine :: Handle -> GHC.Internal.Types.IO GHC.Internal.Base.String
+ hGetNewlineMode :: Handle -> GHC.Internal.Types.IO NewlineMode
hGetPosn :: Handle -> GHC.Internal.Types.IO HandlePosn
hIsClosed :: Handle -> GHC.Internal.Types.IO GHC.Internal.Types.Bool
hIsEOF :: Handle -> GHC.Internal.Types.IO GHC.Internal.Types.Bool
@@ -9921,7 +9922,7 @@ module System.Exit where
exitWith :: forall a. ExitCode -> GHC.Internal.Types.IO a
module System.IO where
- -- Safety: Safe
+ -- Safety: Trustworthy
type BufferMode :: *
data BufferMode = NoBuffering | LineBuffering | BlockBuffering (GHC.Internal.Maybe.Maybe GHC.Internal.Types.Int)
type FilePath :: *
=====================================
testsuite/tests/interface-stability/base-exports.stdout-mingw32
=====================================
@@ -8012,6 +8012,7 @@ module GHC.IO.Handle where
hGetEcho :: Handle -> GHC.Internal.Types.IO GHC.Internal.Types.Bool
hGetEncoding :: Handle -> GHC.Internal.Types.IO (GHC.Internal.Maybe.Maybe GHC.Internal.IO.Encoding.Types.TextEncoding)
hGetLine :: Handle -> GHC.Internal.Types.IO GHC.Internal.Base.String
+ hGetNewlineMode :: Handle -> GHC.Internal.Types.IO NewlineMode
hGetPosn :: Handle -> GHC.Internal.Types.IO HandlePosn
hIsClosed :: Handle -> GHC.Internal.Types.IO GHC.Internal.Types.Bool
hIsEOF :: Handle -> GHC.Internal.Types.IO GHC.Internal.Types.Bool
@@ -10163,7 +10164,7 @@ module System.Exit where
exitWith :: forall a. ExitCode -> GHC.Internal.Types.IO a
module System.IO where
- -- Safety: Safe
+ -- Safety: Trustworthy
type BufferMode :: *
data BufferMode = NoBuffering | LineBuffering | BlockBuffering (GHC.Internal.Maybe.Maybe GHC.Internal.Types.Int)
type FilePath :: *
=====================================
testsuite/tests/interface-stability/base-exports.stdout-ws-32
=====================================
@@ -7848,6 +7848,7 @@ module GHC.IO.Handle where
hGetEcho :: Handle -> GHC.Internal.Types.IO GHC.Internal.Types.Bool
hGetEncoding :: Handle -> GHC.Internal.Types.IO (GHC.Internal.Maybe.Maybe GHC.Internal.IO.Encoding.Types.TextEncoding)
hGetLine :: Handle -> GHC.Internal.Types.IO GHC.Internal.Base.String
+ hGetNewlineMode :: Handle -> GHC.Internal.Types.IO NewlineMode
hGetPosn :: Handle -> GHC.Internal.Types.IO HandlePosn
hIsClosed :: Handle -> GHC.Internal.Types.IO GHC.Internal.Types.Bool
hIsEOF :: Handle -> GHC.Internal.Types.IO GHC.Internal.Types.Bool
@@ -9883,7 +9884,7 @@ module System.Exit where
exitWith :: forall a. ExitCode -> GHC.Internal.Types.IO a
module System.IO where
- -- Safety: Safe
+ -- Safety: Trustworthy
type BufferMode :: *
data BufferMode = NoBuffering | LineBuffering | BlockBuffering (GHC.Internal.Maybe.Maybe GHC.Internal.Types.Int)
type FilePath :: *
=====================================
testsuite/tests/typecheck/should_compile/T9497a.stderr
=====================================
@@ -1,4 +1,3 @@
-
T9497a.hs:2:8: warning: [GHC-88464] [-Wtyped-holes (in -Wdefault)]
• Found hole: _main :: IO ()
Or perhaps ‘_main’ is mis-spelled, or not in scope
@@ -8,8 +7,7 @@ T9497a.hs:2:8: warning: [GHC-88464] [-Wtyped-holes (in -Wdefault)]
main :: IO () (bound at T9497a.hs:2:1)
readLn :: forall a. Read a => IO a
with readLn @()
- (imported from ‘Prelude’
- (and originally defined in ‘GHC.Internal.System.IO’))
+ (imported from ‘Prelude’ (and originally defined in ‘System.IO’))
mempty :: forall a. Monoid a => a
with mempty @(IO ())
(imported from ‘Prelude’
=====================================
testsuite/tests/typecheck/should_compile/holes.stderr
=====================================
@@ -45,6 +45,15 @@ holes.hs:11:15: warning: [GHC-88464] [-Wtyped-holes (in -Wdefault)]
y :: [a]
z :: [a] -> [a]
f :: forall {p}. p
+ appendFile :: FilePath -> String -> IO ()
+ getChar :: IO Char
+ getContents :: IO String
+ getLine :: IO String
+ interact :: (String -> String) -> IO ()
+ putChar :: Char -> IO ()
+ putStr :: String -> IO ()
+ readFile :: FilePath -> IO String
+ writeFile :: FilePath -> String -> IO ()
otherwise :: Bool
(&&) :: Bool -> Bool -> Bool
not :: Bool -> Bool
@@ -58,16 +67,7 @@ holes.hs:11:15: warning: [GHC-88464] [-Wtyped-holes (in -Wdefault)]
showChar :: Char -> ShowS
showParen :: Bool -> ShowS -> ShowS
showString :: String -> ShowS
- appendFile :: FilePath -> String -> IO ()
- getChar :: IO Char
- getContents :: IO String
- getLine :: IO String
- interact :: (String -> String) -> IO ()
- putChar :: Char -> IO ()
- putStr :: String -> IO ()
putStrLn :: String -> IO ()
- readFile :: FilePath -> IO String
- writeFile :: FilePath -> String -> IO ()
EQ :: Ordering
GT :: Ordering
LT :: Ordering
=====================================
testsuite/tests/typecheck/should_compile/holes3.stderr
=====================================
@@ -48,6 +48,15 @@ holes3.hs:11:15: error: [GHC-88464]
y :: [a]
z :: [a] -> [a]
f :: forall {p}. p
+ appendFile :: FilePath -> String -> IO ()
+ getChar :: IO Char
+ getContents :: IO String
+ getLine :: IO String
+ interact :: (String -> String) -> IO ()
+ putChar :: Char -> IO ()
+ putStr :: String -> IO ()
+ readFile :: FilePath -> IO String
+ writeFile :: FilePath -> String -> IO ()
otherwise :: Bool
(&&) :: Bool -> Bool -> Bool
not :: Bool -> Bool
@@ -61,16 +70,7 @@ holes3.hs:11:15: error: [GHC-88464]
showChar :: Char -> ShowS
showParen :: Bool -> ShowS -> ShowS
showString :: String -> ShowS
- appendFile :: FilePath -> String -> IO ()
- getChar :: IO Char
- getContents :: IO String
- getLine :: IO String
- interact :: (String -> String) -> IO ()
- putChar :: Char -> IO ()
- putStr :: String -> IO ()
putStrLn :: String -> IO ()
- readFile :: FilePath -> IO String
- writeFile :: FilePath -> String -> IO ()
EQ :: Ordering
GT :: Ordering
LT :: Ordering
=====================================
testsuite/tests/typecheck/should_compile/valid_hole_fits.stderr
=====================================
@@ -234,15 +234,14 @@ valid_hole_fits.hs:41:8: warning: [GHC-88464] [-Wtyped-holes (in -Wdefault)]
Valid hole fits include
ps :: String -> IO () (defined at valid_hole_fits.hs:9:1)
System.IO.putStr :: String -> IO ()
- (imported qualified from ‘System.IO’ at valid_hole_fits.hs:4:29-34
- (and originally defined in ‘GHC.Internal.System.IO’))
+ (imported qualified from ‘System.IO’ at valid_hole_fits.hs:4:29-34)
System.IO.putStrLn :: String -> IO ()
(imported qualified from ‘System.IO’ at valid_hole_fits.hs:4:37-44
(and originally defined in ‘GHC.Internal.System.IO’))
readIO :: forall a. Read a => String -> IO a
with readIO @()
(imported from ‘Prelude’ at valid_hole_fits.hs:3:1-40
- (and originally defined in ‘GHC.Internal.System.IO’))
+ (and originally defined in ‘System.IO’))
fail :: forall (m :: * -> *) a.
(MonadFail m, GHC.Internal.Stack.Types.HasCallStack) =>
String -> m a
=====================================
testsuite/tests/typecheck/should_fail/T9497d.stderr
=====================================
@@ -8,8 +8,7 @@ T9497d.hs:2:8: error: [GHC-88464]
main :: IO () (bound at T9497d.hs:2:1)
readLn :: forall a. Read a => IO a
with readLn @()
- (imported from ‘Prelude’
- (and originally defined in ‘GHC.Internal.System.IO’))
+ (imported from ‘Prelude’ (and originally defined in ‘System.IO’))
mempty :: forall a. Monoid a => a
with mempty @(IO ())
(imported from ‘Prelude’
=====================================
testsuite/tests/typecheck/should_run/T9497a-run.stderr
=====================================
@@ -10,8 +10,7 @@ T9497a-run.hs:2:8: error: [GHC-88464]
main :: IO () (bound at T9497a-run.hs:2:1)
readLn :: forall a. Read a => IO a
with readLn @()
- (imported from ‘Prelude’
- (and originally defined in ‘GHC.Internal.System.IO’))
+ (imported from ‘Prelude’ (and originally defined in ‘System.IO’))
mempty :: forall a. Monoid a => a
with mempty @(IO ())
(imported from ‘Prelude’
=====================================
testsuite/tests/typecheck/should_run/T9497b-run.stderr
=====================================
@@ -10,8 +10,7 @@ T9497b-run.hs:2:8: error: [GHC-88464]
main :: IO () (bound at T9497b-run.hs:2:1)
readLn :: forall a. Read a => IO a
with readLn @()
- (imported from ‘Prelude’
- (and originally defined in ‘GHC.Internal.System.IO’))
+ (imported from ‘Prelude’ (and originally defined in ‘System.IO’))
mempty :: forall a. Monoid a => a
with mempty @(IO ())
(imported from ‘Prelude’
=====================================
testsuite/tests/typecheck/should_run/T9497c-run.stderr
=====================================
@@ -10,8 +10,7 @@ T9497c-run.hs:2:8: error: [GHC-88464]
main :: IO () (bound at T9497c-run.hs:2:1)
readLn :: forall a. Read a => IO a
with readLn @()
- (imported from ‘Prelude’
- (and originally defined in ‘GHC.Internal.System.IO’))
+ (imported from ‘Prelude’ (and originally defined in ‘System.IO’))
mempty :: forall a. Monoid a => a
with mempty @(IO ())
(imported from ‘Prelude’
=====================================
utils/haddock/html-test/ref/Bug1004.html
=====================================
@@ -627,13 +627,13 @@
>liftReadsPrec</a
> :: (<a href="#" title="Data.Int"
>Int</a
- > -> <a href="#" title="Prelude"
+ > -> <a href="#" title="Text.ParserCombinators.ReadP"
>ReadS</a
- > a) -> <a href="#" title="Prelude"
+ > a) -> <a href="#" title="Text.ParserCombinators.ReadP"
>ReadS</a
> [a] -> <a href="#" title="Data.Int"
>Int</a
- > -> <a href="#" title="Prelude"
+ > -> <a href="#" title="Text.ParserCombinators.ReadP"
>ReadS</a
> (<a href="#" title="Bug1004"
>Product</a
@@ -645,11 +645,11 @@
>liftReadList</a
> :: (<a href="#" title="Data.Int"
>Int</a
- > -> <a href="#" title="Prelude"
+ > -> <a href="#" title="Text.ParserCombinators.ReadP"
>ReadS</a
- > a) -> <a href="#" title="Prelude"
+ > a) -> <a href="#" title="Text.ParserCombinators.ReadP"
>ReadS</a
- > [a] -> <a href="#" title="Prelude"
+ > [a] -> <a href="#" title="Text.ParserCombinators.ReadP"
>ReadS</a
> [<a href="#" title="Bug1004"
>Product</a
@@ -735,15 +735,15 @@
>liftShowsPrec</a
> :: (<a href="#" title="Data.Int"
>Int</a
- > -> a -> <a href="#" title="Prelude"
+ > -> a -> <a href="#" title="Text.Show"
>ShowS</a
- >) -> ([a] -> <a href="#" title="Prelude"
+ >) -> ([a] -> <a href="#" title="Text.Show"
>ShowS</a
>) -> <a href="#" title="Data.Int"
>Int</a
> -> <a href="#" title="Bug1004"
>Product</a
- > f g a -> <a href="#" title="Prelude"
+ > f g a -> <a href="#" title="Text.Show"
>ShowS</a
> <a href="#" class="selflink"
>#</a
@@ -753,13 +753,13 @@
>liftShowList</a
> :: (<a href="#" title="Data.Int"
>Int</a
- > -> a -> <a href="#" title="Prelude"
+ > -> a -> <a href="#" title="Text.Show"
>ShowS</a
- >) -> ([a] -> <a href="#" title="Prelude"
+ >) -> ([a] -> <a href="#" title="Text.Show"
>ShowS</a
>) -> [<a href="#" title="Bug1004"
>Product</a
- > f g a] -> <a href="#" title="Prelude"
+ > f g a] -> <a href="#" title="Text.Show"
>ShowS</a
> <a href="#" class="selflink"
>#</a
@@ -2563,15 +2563,15 @@
></span
> <span class="breakable"
>(<span class="unbreakable"
- ><a href="#" title="Prelude"
+ ><a href="#" title="Text.Read"
>Read</a
> (f a)</span
>, <span class="unbreakable"
- ><a href="#" title="Prelude"
+ ><a href="#" title="Text.Read"
>Read</a
> (g a)</span
>)</span
- > => <a href="#" title="Prelude"
+ > => <a href="#" title="Text.Read"
>Read</a
> (<a href="#" title="Bug1004"
>Product</a
@@ -2603,7 +2603,7 @@
>readsPrec</a
> :: <a href="#" title="Data.Int"
>Int</a
- > -> <a href="#" title="Prelude"
+ > -> <a href="#" title="Text.ParserCombinators.ReadP"
>ReadS</a
> (<a href="#" title="Bug1004"
>Product</a
@@ -2613,7 +2613,7 @@
><p class="src"
><a href="#"
>readList</a
- > :: <a href="#" title="Prelude"
+ > :: <a href="#" title="Text.ParserCombinators.ReadP"
>ReadS</a
> [<a href="#" title="Bug1004"
>Product</a
@@ -2651,15 +2651,15 @@
></span
> <span class="breakable"
>(<span class="unbreakable"
- ><a href="#" title="Prelude"
+ ><a href="#" title="Text.Show"
>Show</a
> (f a)</span
>, <span class="unbreakable"
- ><a href="#" title="Prelude"
+ ><a href="#" title="Text.Show"
>Show</a
> (g a)</span
>)</span
- > => <a href="#" title="Prelude"
+ > => <a href="#" title="Text.Show"
>Show</a
> (<a href="#" title="Bug1004"
>Product</a
@@ -2693,7 +2693,7 @@
>Int</a
> -> <a href="#" title="Bug1004"
>Product</a
- > f g a -> <a href="#" title="Prelude"
+ > f g a -> <a href="#" title="Text.Show"
>ShowS</a
> <a href="#" class="selflink"
>#</a
@@ -2713,7 +2713,7 @@
>showList</a
> :: [<a href="#" title="Bug1004"
>Product</a
- > f g a] -> <a href="#" title="Prelude"
+ > f g a] -> <a href="#" title="Text.Show"
>ShowS</a
> <a href="#" class="selflink"
>#</a
=====================================
utils/haddock/html-test/ref/Bug973.html
=====================================
@@ -58,11 +58,11 @@
>showRead</a
> :: <span class="breakable"
>(<span class="unbreakable"
- ><a href="#" title="Prelude"
+ ><a href="#" title="Text.Show"
>Show</a
> a</span
>, <span class="unbreakable"
- ><a href="#" title="Prelude"
+ ><a href="#" title="Text.Read"
>Read</a
> b</span
>)</span
@@ -74,11 +74,11 @@
>forall</span
> b a. <span class="breakable"
>(<span class="unbreakable"
- ><a href="#" title="Prelude"
+ ><a href="#" title="Text.Show"
>Show</a
> a</span
>, <span class="unbreakable"
- ><a href="#" title="Prelude"
+ ><a href="#" title="Text.Read"
>Read</a
> b</span
>)</span
@@ -104,11 +104,11 @@
><td class="src"
>:: <span class="breakable"
>(<span class="unbreakable"
- ><a href="#" title="Prelude"
+ ><a href="#" title="Text.Show"
>Show</a
> a</span
>, <span class="unbreakable"
- ><a href="#" title="Prelude"
+ ><a href="#" title="Text.Read"
>Read</a
> b</span
>)</span
@@ -152,11 +152,11 @@
>forall</span
> b a. <span class="breakable"
>(<span class="unbreakable"
- ><a href="#" title="Prelude"
+ ><a href="#" title="Text.Show"
>Show</a
> a</span
>, <span class="unbreakable"
- ><a href="#" title="Prelude"
+ ><a href="#" title="Text.Read"
>Read</a
> b</span
>)</span
=====================================
utils/haddock/html-test/ref/ConstructorPatternExport.html
=====================================
@@ -95,7 +95,7 @@
>pattern</span
> <a id="v:BlubCons" class="def"
>BlubCons</a
- > :: () => <a href="#" title="Prelude"
+ > :: () => <a href="#" title="Text.Show"
>Show</a
> b => b -> Blub <a href="#" class="selflink"
>#</a
=====================================
utils/haddock/html-test/ref/DefaultSignatures.html
=====================================
@@ -133,7 +133,7 @@
>default</span
> <a id="v:bar" class="def"
>bar</a
- > :: <a href="#" title="Prelude"
+ > :: <a href="#" title="Text.Show"
>Show</a
> a => a -> <a href="#" title="Data.String"
>String</a
@@ -177,7 +177,7 @@
>default</span
> <a id="v:baz-39-" class="def"
>baz'</a
- > :: <a href="#" title="Prelude"
+ > :: <a href="#" title="Text.Read"
>Read</a
> a => <a href="#" title="Data.String"
>String</a
=====================================
utils/haddock/html-test/ref/Hash.html
=====================================
@@ -111,7 +111,7 @@
>)</span
> => <a href="#" title="Data.Int"
>Int</a
- > -> <a href="#" title="Prelude"
+ > -> <a href="#" title="System.IO"
>IO</a
> (<a href="#" title="Hash"
>HashTable</a
@@ -129,7 +129,7 @@
>Hash</a
> key</span
>)</span
- > => key -> val -> <a href="#" title="Prelude"
+ > => key -> val -> <a href="#" title="System.IO"
>IO</a
> ()</li
><li class="src short"
@@ -137,7 +137,7 @@
>lookup</a
> :: <a href="#" title="Hash"
>Hash</a
- > key => key -> <a href="#" title="Prelude"
+ > key => key -> <a href="#" title="System.IO"
>IO</a
> (<a href="#" title="Data.Maybe"
>Maybe</a
@@ -215,7 +215,7 @@
>)</span
> => <a href="#" title="Data.Int"
>Int</a
- > -> <a href="#" title="Prelude"
+ > -> <a href="#" title="System.IO"
>IO</a
> (<a href="#" title="Hash"
>HashTable</a
@@ -241,7 +241,7 @@
>Hash</a
> key</span
>)</span
- > => key -> val -> <a href="#" title="Prelude"
+ > => key -> val -> <a href="#" title="System.IO"
>IO</a
> () <a href="#" class="selflink"
>#</a
@@ -257,7 +257,7 @@
>lookup</a
> :: <a href="#" title="Hash"
>Hash</a
- > key => key -> <a href="#" title="Prelude"
+ > key => key -> <a href="#" title="System.IO"
>IO</a
> (<a href="#" title="Data.Maybe"
>Maybe</a
=====================================
utils/haddock/html-test/ref/PatternSyns.html
=====================================
@@ -104,7 +104,7 @@
>data</span
> <a href="#"
>BlubType</a
- > = <a href="#" title="Prelude"
+ > = <a href="#" title="Text.Show"
>Show</a
> x => <a href="#"
>BlubCtor</a
@@ -114,7 +114,7 @@
>pattern</span
> <a href="#"
>Blub</a
- > :: () => <a href="#" title="Prelude"
+ > :: () => <a href="#" title="Text.Show"
>Show</a
> x => x -> <a href="#" title="PatternSyns"
>BlubType</a
@@ -266,7 +266,7 @@
><table
><tr
><td class="src"
- ><a href="#" title="Prelude"
+ ><a href="#" title="Text.Show"
>Show</a
> x => <a id="v:BlubCtor" class="def"
>BlubCtor</a
@@ -283,7 +283,7 @@
>pattern</span
> <a id="v:Blub" class="def"
>Blub</a
- > :: () => <a href="#" title="Prelude"
+ > :: () => <a href="#" title="Text.Show"
>Show</a
> x => x -> <a href="#" title="PatternSyns"
>BlubType</a
=====================================
utils/haddock/html-test/ref/PatternSyns2.html
=====================================
@@ -145,7 +145,7 @@
>P</a
> :: () => <span class="keyword"
>forall</span
- > k (a :: k) b. <a href="#" title="Prelude"
+ > k (a :: k) b. <a href="#" title="Text.Show"
>Show</a
> b => <a href="#" title="Data.Proxy"
>Proxy</a
=====================================
utils/haddock/html-test/ref/QuasiExpr.html
=====================================
@@ -122,7 +122,7 @@
><span class="inst-left"
><span class="instance details-toggle-control details-toggle" data-details-id="i:id:Expr:Show:1"
></span
- > <a href="#" title="Prelude"
+ > <a href="#" title="Text.Show"
>Show</a
> <a href="#" title="QuasiExpr"
>Expr</a
@@ -152,7 +152,7 @@
>Int</a
> -> <a href="#" title="QuasiExpr"
>Expr</a
- > -> <a href="#" title="Prelude"
+ > -> <a href="#" title="Text.Show"
>ShowS</a
> <a href="#" class="selflink"
>#</a
@@ -172,7 +172,7 @@
>showList</a
> :: [<a href="#" title="QuasiExpr"
>Expr</a
- >] -> <a href="#" title="Prelude"
+ >] -> <a href="#" title="Text.Show"
>ShowS</a
> <a href="#" class="selflink"
>#</a
@@ -244,7 +244,7 @@
><span class="inst-left"
><span class="instance details-toggle-control details-toggle" data-details-id="i:id:BinOp:Show:1"
></span
- > <a href="#" title="Prelude"
+ > <a href="#" title="Text.Show"
>Show</a
> <a href="#" title="QuasiExpr"
>BinOp</a
@@ -274,7 +274,7 @@
>Int</a
> -> <a href="#" title="QuasiExpr"
>BinOp</a
- > -> <a href="#" title="Prelude"
+ > -> <a href="#" title="Text.Show"
>ShowS</a
> <a href="#" class="selflink"
>#</a
@@ -294,7 +294,7 @@
>showList</a
> :: [<a href="#" title="QuasiExpr"
>BinOp</a
- >] -> <a href="#" title="Prelude"
+ >] -> <a href="#" title="Text.Show"
>ShowS</a
> <a href="#" class="selflink"
>#</a
=====================================
utils/haddock/html-test/ref/Test.html
=====================================
@@ -521,7 +521,7 @@
><li
><a href="#"
>a</a
- > :: <a href="#" title="Prelude"
+ > :: <a href="#" title="System.IO"
>IO</a
> a</li
><li
@@ -575,7 +575,7 @@
>a</a
> :: <a href="#" title="Test"
>C</a
- > a => <a href="#" title="Prelude"
+ > a => <a href="#" title="System.IO"
>IO</a
> a</li
><li class="src short"
@@ -591,7 +591,7 @@
>g</a
> :: <a href="#" title="Data.Int"
>Int</a
- > -> <a href="#" title="Prelude"
+ > -> <a href="#" title="System.IO"
>IO</a
> CInt</li
><li class="src short"
@@ -661,7 +661,7 @@
>Float</a
>) -> <a href="#" title="Test"
>T5</a
- > () () -> <a href="#" title="Prelude"
+ > () () -> <a href="#" title="System.IO"
>IO</a
> ()</li
><li class="src short"
@@ -683,7 +683,7 @@
>R</a
> -> <a href="#" title="Test"
>N1</a
- > () -> <a href="#" title="Prelude"
+ > () -> <a href="#" title="System.IO"
>IO</a
> <a href="#" title="Data.Int"
>Int</a
@@ -693,7 +693,7 @@
>o</a
> :: <a href="#" title="Prelude"
>Float</a
- > -> <a href="#" title="Prelude"
+ > -> <a href="#" title="System.IO"
>IO</a
> <a href="#" title="Prelude"
>Float</a
@@ -1674,7 +1674,7 @@
><p class="src"
><a id="v:a" class="def"
>a</a
- > :: <a href="#" title="Prelude"
+ > :: <a href="#" title="System.IO"
>IO</a
> a <a href="#" class="selflink"
>#</a
@@ -1903,7 +1903,7 @@
>a</a
> :: <a href="#" title="Test"
>C</a
- > a => <a href="#" title="Prelude"
+ > a => <a href="#" title="System.IO"
>IO</a
> a <a href="#" class="selflink"
>#</a
@@ -1991,7 +1991,7 @@ using double quotes: <a href="#"
>g</a
> :: <a href="#" title="Data.Int"
>Int</a
- > -> <a href="#" title="Prelude"
+ > -> <a href="#" title="System.IO"
>IO</a
> CInt <a href="#" class="selflink"
>#</a
@@ -2267,7 +2267,7 @@ is at the beginning of the line).</pre
></tr
><tr
><td class="src"
- >-> <a href="#" title="Prelude"
+ >-> <a href="#" title="System.IO"
>IO</a
> ()</td
><td class="doc"
@@ -2355,7 +2355,7 @@ is at the beginning of the line).</pre
></tr
><tr
><td class="src"
- >-> <a href="#" title="Prelude"
+ >-> <a href="#" title="System.IO"
>IO</a
> <a href="#" title="Data.Int"
>Int</a
@@ -2395,7 +2395,7 @@ is at the beginning of the line).</pre
></tr
><tr
><td class="src"
- >-> <a href="#" title="Prelude"
+ >-> <a href="#" title="System.IO"
>IO</a
> <a href="#" title="Prelude"
>Float</a
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/2edd18b6cbb43792bd108bf77e0a130…
--
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/2edd18b6cbb43792bd108bf77e0a130…
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[Git][ghc/ghc][wip/supersven/correctly_propagate_host-build-target] Prevent -g
by Sven Tennie (＠supersven) 26 Mar '26
by Sven Tennie (＠supersven) 26 Mar '26
26 Mar '26
Sven Tennie pushed to branch wip/supersven/correctly_propagate_host-build-target at Glasgow Haskell Compiler / GHC
Commits:
6c712038 by Sven Tennie at 2026-03-26T19:19:28+01:00
Prevent -g
- - - - -
1 changed file:
- distrib/configure.ac.in
Changes:
=====================================
distrib/configure.ac.in
=====================================
@@ -153,6 +153,14 @@ AC_SUBST([EnableStrictGhcToolchainCheck])
dnl ** Which gcc to use?
dnl --------------------------------------------------------------
+
+dnl AC_PROG_CC sets CFLAGS to `-g -O2` if if the env var is empty.
+dnl Same goes for AC_PROG_CXX and CXXFLAGS.
+dnl `-O2` is fine, but we don't want to build with debugging symbols (`-g`) by
+dnl default as this massively increases binary sizes.
+: ${CFLAGS=""}
+: ${CXXFLAGS=""}
+
AC_PROG_CC([cc gcc clang])
AC_PROG_CXX([c++ g++ clang++])
# Work around #24324
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/6c712038468504482327995bbc92fc2…
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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/6c712038468504482327995bbc92fc2…
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26 Mar '26
Cheng Shao pushed new branch wip/binary-array-no-list at Glasgow Haskell Compiler / GHC
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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/binary-array-no-list
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