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[Git][ghc/ghc][wip/T18570] 173 commits: Move ModuleGraph into UnitEnv
by Sjoerd Visscher (＠trac-sjoerd_visscher) 18 Aug '25

18 Aug '25

Sjoerd Visscher pushed to branch wip/T18570 at Glasgow Haskell Compiler / GHC Commits: 0fb37893 by Matthew Pickering at 2025-06-23T13:55:10-04:00 Move ModuleGraph into UnitEnv The ModuleGraph is a piece of information associated with the ExternalPackageState and HomeUnitGraph. Therefore we should store it inside the HomeUnitEnv. - - - - - 3bf6720e by soulomoon at 2025-06-23T13:55:52-04:00 Remove hptAllFamInstances usage during upsweep Fixes #26118 This change eliminates the use of hptAllFamInstances during the upsweep phase, as it could access non-below modules from the home package table. The following updates were made: * Updated checkFamInstConsistency to accept an explicit ModuleEnv FamInstEnv parameter and removed the call to hptAllFamInstances. * Adjusted hugInstancesBelow so we can construct ModuleEnv FamInstEnv from its result, * hptAllFamInstances and allFamInstances functions are removed. - - - - - 83ee7b78 by Ben Gamari at 2025-06-24T05:02:07-04:00 configure: Don't force value of OTOOL, etc. if not present Previously if `otool` and `install_name_tool` were not present they would be overridden by `fp_settings.m4`. This logic was introduced in 4ff93292243888545da452ea4d4c1987f2343591 without explanation. - - - - - 9329c9e1 by Ben Gamari at 2025-06-24T05:02:07-04:00 ghc-toolchain: Add support for otool, install_name_tool Fixes part of ghc#23675. - - - - - 25f5c998 by Ben Gamari at 2025-06-24T05:02:08-04:00 ghc-toolchain: Add support for llc, opt, llvm-as Fixes #23675. - - - - - 51d150dd by Rodrigo Mesquita at 2025-06-24T05:02:08-04:00 hadrian: Use settings-use-distro-mingw directly The type `ToolchainSetting` only made sense when we had more settings to fetch from the system config file. Even then "settings-use-distro-mingw" is arguably not a toolchain setting. With the fix for #23675, all toolchain tools were moved to the `ghc-toolchain` `Toolchain` format. Therefore, we can inline `settings-use-distro-mingw` accesses and delete `ToolchainSetting`. - - - - - dcf68a83 by Rodrigo Mesquita at 2025-06-24T05:02:08-04:00 configure: Check LlvmTarget exists for LlvmAsFlags If LlvmTarget was empty, LlvmAsFlags would be just "--target=". If it is empty now, simply keep LlvmAsFlags empty. ghc-toolchain already does this right. This fix makes the two configurations match up. - - - - - 580a3353 by Ben Gamari at 2025-06-24T05:02:51-04:00 rts/linker/LoadArchive: Use bool Improve type precision by using `bool` instead of `int` and `StgBool`. - - - - - 76d1041d by Ben Gamari at 2025-06-24T05:02:51-04:00 rts/linker/LoadArchive: Don't rely on file extensions for identification Previously archive members would be identified via their file extension, as described in #13103. We now instead use a more principled approach, relying on the magic number in the member's header. As well, we refactor treatment of archive format detection to improve code clarity and error handling. Closes #13103. - - - - - 4b748a99 by Teo Camarasu at 2025-06-24T15:31:07-04:00 template-haskell: improve changelog stable -> more stable, just to clarify that this interface isn't fully stable. errornously -> mistakenly: I typod this and also let's go for a simpler word - - - - - e358e477 by Sylvain Henry at 2025-06-24T15:31:58-04:00 Bump stack resolver to use GHC 9.6.7 Cf #26139 - - - - - 4bf5eb63 by fendor at 2025-06-25T17:05:43-04:00 Teach `:reload` about multiple home units `:reload` needs to lookup the `ModuleName` and must not assume the given `ModuleName` is in the current `HomeUnit`. We add a new utility function which allows us to find a `HomeUnitModule` instead of a `Module`. Further, we introduce the `GhciCommandError` type which can be used to abort the execution of a GHCi command. This error is caught and printed in a human readable fashion. - - - - - b3d97bb3 by fendor at 2025-06-25T17:06:25-04:00 Implement `-fno-load-initial-targets` flag We add the new flag `-fno-load-initial-targets` which doesn't load all `Target`s immediately but only computes the module graph for all `Target`s. The user can then decide to load modules from that module graph using the syntax: ghci> :reload <Mod> This will load everything in the module graph up to `Mod`. The user can return to the initial state by using the builtin target `none` to unload all modules. ghci> :reload none Is in principle identical to starting a new session with the `-fno-load-initial-targets` flag. The `-fno-load-initial-targets` flag allows for faster startup time of GHCi when a user has lots of `Target`s. We additionally extend the `:reload` command to accept multiple `ModuleName`s. For example: ghci> :reload <Mod1> <Mod2> Loads all modules up to the modules `Mod1` and `Mod2`. - - - - - 49f44e52 by Teo Camarasu at 2025-06-26T04:19:51-04:00 Expose ghc-internal unit id through the settings file This in combination with the unit id of the compiler library allows cabal to know of the two unit ids that should not be reinstalled (in specific circumstances) as: - when using plugins, we want to link against exactly the compiler unit id - when using TemplateHaskell we want to link against exactly the package that contains the TemplateHaskell interfaces, which is `ghc-internal` See: <https://github.com/haskell/cabal/issues/10087> Resolves #25282 - - - - - 499c4efe by Bryan Richter at 2025-06-26T04:20:33-04:00 CI: Fix and clean up capture of timings * Fixes the typo that caused 'cat ci-timings' to report "no such file or directory" * Gave ci_timings.txt a file extension so it may play better with other systems * Fixed the use of time_it so all times are recorded * Fixed time_it to print name along with timing - - - - - 86c90c9e by Bryan Richter at 2025-06-26T04:20:33-04:00 CI: Update collapsible section usage The syntax apparently changed at some point. - - - - - 04308ee4 by Bryan Richter at 2025-06-26T04:20:33-04:00 CI: Add more collapsible sections - - - - - 43b606bb by Florian Ragwitz at 2025-06-27T16:31:26-04:00 Tick uses of wildcard/pun field binds as if using the record selector function Fixes #17834. See Note [Record-selector ticks] for additional reasoning behind this as well as an overview of the implementation details and future improvements. - - - - - d4952549 by Ben Gamari at 2025-06-27T16:32:08-04:00 testsuite/caller-cc: Make CallerCc[123] less sensitive These were previously sensitive to irrelevant changes in program structure. To avoid this we filter out all by lines emitted by the -fcaller-cc from the profile. - - - - - 8d33d048 by Berk Özkütük at 2025-07-07T20:42:20-04:00 Consider `PromotedDataCon` in `tyConStupidTheta` Haddock checks data declarations for the stupid theta so as not to pretty-print them as empty contexts. Type data declarations end up as `PromotedDataCon`s by the time Haddock performs this check, causing a panic. This commit extends `tyConStupidTheta` so that it returns an empty list for `PromotedDataCon`s. This decision was guided by the fact that type data declarations never have data type contexts (see (R1) in Note [Type data declarations]). Fixes #25739. - - - - - a26243fd by Ryan Hendrickson at 2025-07-07T20:43:07-04:00 haddock: Document instances from other packages When attaching instances to `Interface`s, it isn't enough just to look for instances in the list of `Interface`s being processed. We also need to look in the modules on which they depend, including those outside of this package. Fixes #25147. Fixes #26079. - - - - - 0fb24420 by Rodrigo Mesquita at 2025-07-07T20:43:49-04:00 hadrian: Fallback logic for internal interpreter When determining whether to build the internal interpreter, the `make` build system had a fallback case for platforms not in the list of explicitly-supported operating systems and architectures. This fallback says we should try to build the internal interpreter if building dynamic GHC programs (if the architecture is unknown). Fixes #24098 - - - - - fe925bd4 by Ben Gamari at 2025-07-07T20:44:30-04:00 users-guide: Reference Wasm FFI section - - - - - 5856284b by Ben Gamari at 2025-07-07T20:44:30-04:00 users-guide: Fix too-short heading warning - - - - - a48dcdf3 by Duncan Coutts at 2025-07-07T20:45:18-04:00 Reorganise documentation for allocate* functions Consolodate interface information into the .h file, keeping just implementation details in the .c file. Use Notes stlye in the .h file and refer to notes from the .c file. - - - - - de5b528c by Duncan Coutts at 2025-07-07T20:45:18-04:00 Introduce common utilities for allocating arrays The intention is to share code among the several places that do this already. - - - - - b321319d by Duncan Coutts at 2025-07-07T20:45:18-04:00 Use new array alloc utils in Heap.c The CMM primop can now report heap overflow. - - - - - 1d557ffb by Duncan Coutts at 2025-07-07T20:45:18-04:00 Use new array alloc utils in ThreadLabels.c Replacing a local utility. - - - - - e59a1430 by Duncan Coutts at 2025-07-07T20:45:18-04:00 Use new array alloc utils in Threads.c Replacing local open coded version. - - - - - 482df1c9 by Duncan Coutts at 2025-07-07T20:45:18-04:00 Add exitHeapOverflow helper utility This will be useful with the array alloc functions, since unlike allocate/allocateMaybeFail, they do not come in two versions. So if it's not convenient to propagate failure, then one can use this. - - - - - 4d3ec8f9 by Duncan Coutts at 2025-07-07T20:45:18-04:00 Use new array alloc utils in Weak.c Also add a cpp macro CCS_SYSTEM_OR_NULL which does what it says. The benefit of this is that it allows us to referece CCS_SYSTEM even when we're not in PROFILING mode. That makes abstracting over profiling vs normal mode a lot easier. - - - - - 0c4f2fde by Duncan Coutts at 2025-07-07T20:45:18-04:00 Convert the array alloc primops to use the new array alloc utils - - - - - a3354ad9 by Duncan Coutts at 2025-07-07T20:45:18-04:00 While we're at it, add one missing 'likely' hint To a cmm primops that raises an exception, like the others now do. - - - - - 33b546bd by meooow25 at 2025-07-07T20:46:09-04:00 Keep scanl' strict in the head on rewrite `scanl'` forces elements to WHNF when the corresponding `(:)`s are forced. The rewrite rule for `scanl'` missed forcing the first element, which is fixed here with a `seq`. - - - - - 8a69196e by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00 debugger/rts: Allow toggling step-in per thread The RTS global flag `rts_stop_next_breakpoint` globally sets the interpreter to stop at the immediate next breakpoint. With this commit, single step mode can additionally be set per thread in the TSO flag (TSO_STOP_NEXT_BREAKPOINT). Being able to toggle "stop at next breakpoint" per thread is an important requirement for implementing "stepping out" of a function in a multi-threaded context. And, more generally, having a per-thread flag for single-stepping paves the way for multi-threaded debugging. That said, when we want to enable "single step" mode for the whole interpreted program we still want to stop at the immediate next breakpoint, whichever thread it belongs to. That's why we also keep the global `rts_stop_next_breakpoint` flag, with `rts_enableStopNextBreakpointAll` and `rts_disableStopNextBreakpointAll` helpers. Preparation for #26042 - - - - - 73d3f864 by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00 docs: Case continuation BCOs This commit documents a subtle interaction between frames for case BCOs and their parents frames. Namely, case continuation BCOs may refer to (non-local) variables that are part of the parent's frame. The note expanding a bit on these details is called [Case continuation BCOs] - - - - - d7aeddcf by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00 debugger: Implement step-out feature Implements support for stepping-out of a function (aka breaking right after returning from a function) in the interactive debugger. It also introduces a GHCi command :stepout to step-out of a function being debugged in the interpreter. The feature is described as: Stop at the first breakpoint immediately after returning from the current function scope. Known limitations: because a function tail-call does not push a stack frame, if step-out is used inside of a function that was tail-called, execution will not be returned to its caller, but rather its caller's first non-tail caller. On the other hand, it means the debugger follows the more realistic execution of the program. In the following example: .. code-block:: none f = do a b <--- (1) set breakpoint then step in here c b = do ... d <--- (2) step-into this tail call d = do ... something <--- (3) step-out here ... Stepping-out will stop execution at the `c` invokation in `f`, rather than stopping at `b`. The key idea is simple: When step-out is enabled, traverse the runtime stack until a continuation BCO is found -- and enable the breakpoint heading that BCO explicitly using its tick-index. The details are specified in `Note [Debugger: Step-out]` in `rts/Interpreter.c`. Since PUSH_ALTS BCOs (representing case continuations) were never headed by a breakpoint (unlike the case alternatives they push), we introduced the BRK_ALTS instruction to allow the debugger to set a case continuation to stop at the breakpoint heading the alternative that is taken. This is further described in `Note [Debugger: BRK_ALTS]`. Fixes #26042 - - - - - 5d9adf51 by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00 debugger: Filter step-out stops by SrcSpan To implement step-out, the RTS looks for the first continuation frame on the stack and explicitly enables its entry breakpoint. However, some continuations will be contained in the function from which step-out was initiated (trivial example is a case expression). Similarly to steplocal, we will filter the breakpoints at which the RTS yields to the debugger based on the SrcSpan. When doing step-out, only stop if the breakpoint is /not/ contained in the function from which we initiated it. This is especially relevant in monadic statements such as IO which is compiled to a long chain of case expressions. See Note [Debugger: Filtering step-out stops] - - - - - 7677adcc by Cheng Shao at 2025-07-08T07:40:29-04:00 compiler: make ModBreaks serializable - - - - - 14f67c6d by Rodrigo Mesquita at 2025-07-08T07:40:29-04:00 refactor: "Inspecting the session" moved from GHC Moved utilities for inspecting the session from the GHC module to GHC.Driver.Session.Inspect Purely a clean up - - - - - 9d3f484a by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Pass the HUG to readModBreaks, not HscEnv A minor cleanup. The associated history and setupBreakpoint functions are changed accordingly. - - - - - b595f713 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Move readModBreaks to GHC.Runtime.Interpreter With some small docs changes - - - - - d223227a by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Move interpreterProfiled to Interp.Types Moves interpreterProfiled and interpreterDynamic to GHC.Runtime.Interpreter.Types from GHC.Runtime.Interpreter. - - - - - 7fdd0a3d by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Don't import GHC in Debugger.Breakpoints Remove the top-level import GHC from GHC.Runtime.Debugger.Breakpoints This makes the module dependencies more granular and cleans up the qualified imports from the code. - - - - - 5e4da31b by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 refactor: Use BreakpointId in Core and Ifaces - - - - - 741ac3a8 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 stg2bc: Derive BcM via ReaderT StateT A small refactor that simplifies GHC.StgToByteCode by deriving-via the Monad instances for BcM. This is done along the lines of previous similar refactors like 72b54c0760bbf85be1f73c1a364d4701e5720465. - - - - - 0414fcc9 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 refact: Split InternalModBreaks out of ModBreaks There are currently two competing ways of referring to a Breakpoint: 1. Using the Tick module + Tick index 2. Using the Info module + Info index 1. The Tick index is allocated during desugaring in `mkModBreaks`. It is used to refer to a breakpoint associated to a Core Tick. For a given Tick module, there are N Ticks indexed by Tick index. 2. The Info index is allocated during code generation (in StgToByteCode) and uniquely identifies the breakpoints at runtime (and is indeed used to determine which breakpoint was hit at runtime). Why we need both is described by Note [Breakpoint identifiers]. For every info index we used to keep a `CgBreakInfo`, a datatype containing information relevant to ByteCode Generation, in `ModBreaks`. This commit splits out the `IntMap CgBreakInfo` out of `ModBreaks` into a new datatype `InternalModBreaks`. - The purpose is to separate the `ModBreaks` datatype, which stores data associated from tick-level information which is fixed after desugaring, from the unrelated `IntMap CgBreakInfo` information accumulated during bytecode generation. - We move `ModBreaks` to GHC.HsToCore.Breakpoints The new `InternalModBreaks` simply combines the `IntMap CgBreakInfo` with `ModBreaks`. After code generation we construct an `InternalModBreaks` with the `CgBreakInfo`s we accumulated and the existing `ModBreaks` and store that in the compiled BCO in `bc_breaks`. - Note that we previously only updated the `modBreaks_breakInfo` field of `ModBreaks` at this exact location, and then stored the updated `ModBreaks` in the same `bc_breaks`. - We put this new datatype in GHC.ByteCode.Breakpoints The rest of the pipeline for which CgBreakInfo is relevant is accordingly updated to also use `InternalModBreaks` - - - - - 2a097955 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Use BreakpointIds in bytecode gen Small clean up to use BreakpointId and InternalBreakpointId more uniformly in bytecode generation rather than using Module + Ix pairs - - - - - 0515cc2f by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 ghci: Allocate BreakArrays at link time only Previously, a BreakArray would be allocated with a slot for every tick in a module at `mkModBreaks`, in HsToCore. However, this approach has a few downsides: - It interleaves interpreter behaviour (allocating arrays for breakpoints) within the desugarer - It is inflexible in the sense it is impossible for the bytecode generator to add "internal" breakpoints that can be triggered at runtime, because those wouldn't have a source tick. (This is relevant for our intended implementation plan of step-out in #26042) - It ties the BreakArray indices to the *tick* indexes, while at runtime we would rather just have the *info* indexes (currently we have both because BreakArrays are indexed by the *tick* one). Paving the way for #26042 and #26064, this commit moves the allocation of BreakArrays to bytecode-loading time -- akin to what is done for CCS arrays. Since a BreakArray is allocated only when bytecode is linked, if a breakpoint is set (e.g. `:break 10`) before the bytecode is linked, there will exist no BreakArray to trigger the breakpoint in. Therefore, the function to allocate break arrays (`allocateBreakArrays`) is exposed and also used in GHC.Runtime.Eval to allocate a break array when a breakpoint is set, if it doesn't exist yet (in the linker env). - - - - - 8016561f by Simon Peyton Jones at 2025-07-08T07:41:13-04:00 Add a test for T26176 - - - - - 454cd682 by Simon Peyton Jones at 2025-07-08T07:41:13-04:00 Add test for #14010 This test started to work in GHC 9.6 and has worked since. This MR just adds a regression test - - - - - ea2c6673 by Teo Camarasu at 2025-07-08T13:24:43-04:00 Implement user-defined allocation limit handlers Allocation Limits allow killing a thread if they allocate more than a user-specified limit. We extend this feature to allow more versatile behaviour. - We allow not killing the thread if the limit is exceeded. - We allow setting a custom handler to be called when the limit is exceeded. User-specified allocation limit handlers run in a fresh thread and are passed the ThreadId of the thread that exceeded its limit. We introduce utility functions for getting and setting the allocation limits of other threads, so that users can reset the limit of a thread from a handler. Both of these are somewhat coarse-grained as we are unaware of the allocations in the current nursery chunk. We provide several examples of usages in testsuite/tests/rts/T22859.hs Resolves #22859 - - - - - 03e047f9 by Simon Hengel at 2025-07-08T13:25:25-04:00 Fix typo in using.rst - - - - - 67957854 by Ben Gamari at 2025-07-09T09:44:44-04:00 compiler: Import AnnotationWrapper from ghc-internal Since `GHC.Desugar` exported from `base` has been deprecated. - - - - - 813d99d6 by Ben Gamari at 2025-07-09T09:44:44-04:00 ghc-compact: Eliminate dependency on ghc-prim - - - - - 0ec952a1 by Ben Gamari at 2025-07-09T09:44:44-04:00 ghc-heap: Eliminate dependency on ghc-prim - - - - - 480074c3 by Ben Gamari at 2025-07-09T09:44:44-04:00 ghc-heap: Drop redundant import - - - - - 03455829 by Ben Gamari at 2025-07-09T09:44:45-04:00 ghc-prim: Bump version to 0.13.1 There are no interface changes from 0.13.0 but the implementation now lives in `ghc-internal`. - - - - - d315345a by Ben Gamari at 2025-07-09T09:44:45-04:00 template-haskell: Bump version number to 2.24.0.0 Bumps exceptions submodule. - - - - - 004c800e by Ben Gamari at 2025-07-09T09:44:45-04:00 Bump GHC version number to 9.14 - - - - - eb1a3816 by Ben Gamari at 2025-07-09T09:44:45-04:00 Bump parsec to 3.1.18.0 Bumps parsec submodule. - - - - - 86f83296 by Ben Gamari at 2025-07-09T09:44:45-04:00 unix: Bump to 2.8.7.0 Bumps unix submodule. - - - - - 89e13998 by Ben Gamari at 2025-07-09T09:44:45-04:00 binary: Bump to 0.8.9.3 Bumps binary submodule. - - - - - 55fff191 by Ben Gamari at 2025-07-09T09:44:45-04:00 Win32: Bump to 2.14.2.0 Bumps Win32 submodule. - - - - - 7dafa40c by Ben Gamari at 2025-07-09T09:44:45-04:00 base: Bump version to 4.22.0 Bumps various submodules. - - - - - ef03d8b8 by Rodrigo Mesquita at 2025-07-09T09:45:28-04:00 base: Export displayExceptionWithInfo This function should be exposed from base following CLC#285 Approved change in CLC#344 Fixes #26058 - - - - - 01d3154e by Wen Kokke at 2025-07-10T17:06:36+01:00 Fix documentation for HEAP_PROF_SAMPLE_STRING - - - - - ac259c48 by Wen Kokke at 2025-07-10T17:06:38+01:00 Fix documentation for HEAP_PROF_SAMPLE_COST_CENTRE - - - - - 2b4db9ba by Pi Delport at 2025-07-11T16:40:52-04:00 (Applicative docs typo: missing "one") - - - - - f707bab4 by Andreas Klebinger at 2025-07-12T14:56:16+01:00 Specialise: Improve specialisation by refactoring interestingDict This MR addresses #26051, which concerns missed type-class specialisation. The main payload of the MR is to completely refactor the key function `interestingDict` in GHC.Core.Opt.Specialise The main change is that we now also look at the structure of the dictionary we consider specializing on, rather than only the type. See the big `Note [Interesting dictionary arguments]` - - - - - ca7a9d42 by Simon Peyton Jones at 2025-07-12T14:56:16+01:00 Treat tuple dictionaries uniformly; don't unbox them See `Note [Do not unbox class dictionaries]` in DmdAnal.hs, sep (DNB1). This MR reverses the plan in #23398, which suggested a special case to unbox tuple dictionaries in worker/wrapper. But: - This was the cause of a pile of complexity in the specialiser (#26158) - Even with that complexity, specialision was still bad, very bad See https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297 And it's entirely unnecessary! Specialision works fine without unboxing tuple dictionaries. - - - - - be7296c9 by Andreas Klebinger at 2025-07-12T14:56:16+01:00 Remove complex special case from the type-class specialiser There was a pretty tricky special case in Specialise which is no longer necessary. * Historical Note [Floating dictionaries out of cases] * #26158 * #19747 https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297 This MR removes it. Hooray. - - - - - 4acf3a86 by Ben Gamari at 2025-07-15T05:46:32-04:00 configure: bump version to 9.15 - - - - - 45efaf71 by Teo Camarasu at 2025-07-15T05:47:13-04:00 rts/nonmovingGC: remove n_free We remove the nonmovingHeap.n_free variable. We wanted this to track the length of nonmovingHeap.free. But this isn't possible to do atomically. When this isn't accurate we can get a segfault by going past the end of the list. Instead, we just count the length of the list when we grab it in nonmovingPruneFreeSegment. Resolves #26186 - - - - - c635f164 by Ben Gamari at 2025-07-15T14:05:54-04:00 configure: Drop probing of ld.gold As noted in #25716, `gold` has been dropped from binutils-2.44. Fixes #25716. Metric Increase: size_hello_artifact_gzip size_hello_unicode_gzip ghc_prim_so - - - - - 637bb538 by Ben Gamari at 2025-07-15T14:05:55-04:00 testsuite/recomp015: Ignore stderr This is necessary since ld.bfd complains that we don't have a .note.GNU-stack section, potentially resulting in an executable stack. - - - - - d3cd4ec8 by Wen Kokke at 2025-07-15T14:06:39-04:00 Fix documentation for heap profile ID - - - - - 73082769 by Ben Gamari at 2025-07-15T16:56:38-04:00 Bump win32-tarballs to v0.9 - - - - - 3b63b254 by Ben Gamari at 2025-07-15T16:56:39-04:00 rts/LoadArchive: Handle null terminated string tables As of `llvm-ar` now emits filename tables terminated with null characters instead of the usual POSIX `/\n` sequence. Fixes #26150. - - - - - 195f6527 by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: rename label so name doesn't conflict with param - - - - - 63373b95 by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Handle API set symbol versioning conflicts - - - - - 48e9aa3e by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Mark API set symbols as HIDDEN and correct symbol type - - - - - 959e827a by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Implement WEAK EXTERNAL undef redirection by target symbol name - - - - - 65f19293 by Ben Gamari at 2025-07-15T16:56:39-04:00 rts/LoadArchive: Handle string table entries terminated with / llvm-ar appears to terminate string table entries with `/\n` [1]. This matters in the case of thin archives, since the filename is used. In the past this worked since `llvm-ar` would produce archives with "small" filenames when possible. However, now it appears to always use the string table. [1] https://github.com/llvm/llvm-project/blob/bfb686bb5ba503e9386dc899e1ebbe248… - - - - - 9cbb3ef5 by Ben Gamari at 2025-07-15T16:56:39-04:00 testsuite: Mark T12497 as fixed Thanks to the LLVM toolchain update. Closes #22694. - - - - - 2854407e by Ben Gamari at 2025-07-15T16:56:39-04:00 testsuite: Accept new output of T11223_link_order_a_b_2_fail on Windows The archive member number changed due to the fact that llvm-ar now uses a string table. - - - - - 28439593 by Ben Gamari at 2025-07-15T16:56:39-04:00 rts/linker/PEi386: Implement IMAGE_REL_AMD64_SECREL This appears to now be used by libc++ as distributed by msys2. - - - - - 2b053755 by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Cleanup merge resolution residue in lookupSymbolInDLL_PEi386 and make safe without dependent - - - - - e8acd2e7 by Wen Kokke at 2025-07-16T08:37:04-04:00 Remove the `profile_id` parameter from various RTS functions. Various RTS functions took a `profile_id` parameter, intended to be used to distinguish parallel heap profile breakdowns (e.g., `-hT` and `-hi`). However, this feature was never implemented and the `profile_id` parameter was set to 0 throughout the RTS. This commit removes the parameter but leaves the hardcoded profile ID in the functions that emit the encoded eventlog events as to not change the protocol. The affected functions are `traceHeapProfBegin`, `postHeapProfBegin`, `traceHeapProfSampleString`, `postHeapProfSampleString`, `traceHeapProfSampleCostCentre`, and `postHeapProfSampleCostCentre`. - - - - - 76d392a2 by Wen Kokke at 2025-07-16T08:37:04-04:00 Make `traceHeapProfBegin` an init event. - - - - - bbaa44a7 by Peng Fan at 2025-07-16T16:50:42-04:00 NCG/LA64: Support finer-grained DBAR hints For LA664 and newer uarchs, they have made finer granularity hints available: Bit4: ordering or completion (0: completion, 1: ordering) Bit3: barrier for previous read (0: true, 1: false) Bit2: barrier for previous write (0: true, 1: false) Bit1: barrier for succeeding read (0: true, 1: false) Bit0: barrier for succeeding write (0: true, 1: false) And not affect the existing models because other hints are treated as 'dbar 0' there. - - - - - 7da86e16 by Andreas Klebinger at 2025-07-16T16:51:25-04:00 Disable -fprof-late-overloaded-calls for join points. Currently GHC considers cost centres as destructive to join contexts. Or in other words this is not considered valid: join f x = ... in ... -> scc<tick> jmp This makes the functionality of `-fprof-late-overloaded-calls` not feasible for join points in general. We used to try to work around this by putting the ticks on the rhs of the join point rather than around the jump. However beyond the loss of accuracy this was broken for recursive join points as we ended up with something like: rec-join f x = scc<tick> ... jmp f x Which similarly is not valid as the tick once again destroys the tail call. One might think we could limit ourselves to non-recursive tail calls and do something clever like: join f x = scc<tick> ... in ... jmp f x And sometimes this works! But sometimes the full rhs would look something like: join g x = .... join f x = scc<tick> ... -> jmp g x Which, would again no longer be valid. I believe in the long run we can make cost centre ticks non-destructive to join points. Or we could keep track of where we are/are not allowed to insert a cost centre. But in the short term I will simply disable the annotation of join calls under this flag. - - - - - 7ee22fd5 by ARATA Mizuki at 2025-07-17T06:05:30-04:00 x86 NCG: Better lowering for shuffleFloatX4# and shuffleDoubleX2# The new implementation * make use of specialized instructions like (V)UNPCK{L,H}{PS,PD}, and * do not require -mavx. Close #26096 Co-authored-by: sheaf <sam.derbyshire(a)gmail.com> - - - - - c6cd2da1 by Jappie Klooster at 2025-07-17T06:06:20-04:00 Update interact docs to explain about buffering We need to tell the user to set to the appropriate buffer format. Otherwise, this function may get randomly stuck, or just behave confusingly. issue: https://gitlab.haskell.org/ghc/ghc/-/issues/26131 NB, I'm running this with cabal *NOT* ghci. ghci messes with buffering anyway. ```haskell interaction :: String -> String interaction "jappie" = "hi" interaction "jakob" = "hello" interaction x = "unkown input: " <> x main :: IO () main = interact interaction ``` so in my input (prefixed by `>`) I get: ``` > jappie unkown input: jappie ``` we confirmed later this was due to lack of \n matching. Anyway movnig on to more unexpected stuff: ```haskell main :: IO () main = do interact (concatMap interaction . lines) ``` get's stuck forever. actually `^D` (ctrl+d) unstucks it and runs all input as expected. for example you can get: ``` > sdfkds > fakdsf unkown input: sdfkdsunkown input: fakdsf ``` This program works! ```haskell interaction :: String -> String interaction "jappie" = "hi \n" interaction "jakob" = "hello \n" interaction x = "unkown input: " <> x <> "\n" main :: IO () main = do interact (concatMap interaction . lines) ``` the reason is that linebuffering is set for both in and output by default. so lines eats the input lines, and all the \n postfixes make sure the buffer is put out. - - - - - 9fa590a6 by Zubin Duggal at 2025-07-17T06:07:03-04:00 fetch_gitlab: Ensure we copy users_guide.pdf and Haddock.pdf to the release docs directory Fixes #24093 - - - - - cc650b4b by Andrew Lelechenko at 2025-07-17T12:30:24-04:00 Add Data.List.NonEmpty.mapMaybe As per https://github.com/haskell/core-libraries-committee/issues/337 - - - - - 360fa82c by Duncan Coutts at 2025-07-17T12:31:14-04:00 base: Deprecate GHC.Weak.Finalize.runFinalizerBatch https://github.com/haskell/core-libraries-committee/issues/342 - - - - - f4e8466c by Alan Zimmerman at 2025-07-17T12:31:55-04:00 EPA: Update exact printing based on GHC 9.14 tests As a result of migrating the GHC ghc-9.14 branch tests to ghc-exactprint in https://github.com/alanz/ghc-exactprint/tree/ghc-9.14, a couple of discrepancies were picked up - The opening paren for a DefaultDecl was printed in the wrong place - The import declaration level specifiers were not printed. This commit adds those fixes, and some tests for them. The tests brought to light that the ImportDecl ppr instance had not been updated for level specifiers, so it updates that too. - - - - - 8b731e3c by Matthew Pickering at 2025-07-21T13:36:43-04:00 level imports: Fix infinite loop with cyclic module imports I didn't anticipate that downsweep would run before we checked for cyclic imports. Therefore we need to use the reachability function which handles cyclic graphs. Fixes #26087 - - - - - d751a9f1 by Pierre Thierry at 2025-07-21T13:37:28-04:00 Fix documentation about deriving from generics - - - - - f8d9d016 by Andrew Lelechenko at 2025-07-22T21:13:28-04:00 Fix issues with toRational for types capable to represent infinite and not-a-number values This commit fixes all of the following pitfalls: > toRational (read "Infinity" :: Double) 179769313486231590772930519078902473361797697894230657273430081157732675805500963132708477322407536021120113879871393357658789768814416622492847430639474124377767893424865485276302219601246094119453082952085005768838150682342462881473913110540827237163350510684586298239947245938479716304835356329624224137216 % 1 > toRational (read "NaN" :: Double) 269653970229347386159395778618353710042696546841345985910145121736599013708251444699062715983611304031680170819807090036488184653221624933739271145959211186566651840137298227914453329401869141179179624428127508653257226023513694322210869665811240855745025766026879447359920868907719574457253034494436336205824 % 1 > realToFrac (read "NaN" :: Double) -- With -O0 Infinity > realToFrac (read "NaN" :: Double) -- With -O1 NaN > realToFrac (read "NaN" :: Double) :: CDouble Infinity > realToFrac (read "NaN" :: CDouble) :: Double Infinity Implements https://github.com/haskell/core-libraries-committee/issues/338 - - - - - 5dabc718 by Zubin Duggal at 2025-07-22T21:14:10-04:00 haddock: Don't warn about missing link destinations for derived names. Fixes #26114 - - - - - 9c3a0937 by Matthew Pickering at 2025-07-22T21:14:52-04:00 template haskell: use a precise condition when implicitly lifting Implicit lifting corrects a level error by replacing references to `x` with `$(lift x)`, therefore you can use a level `n` binding at level `n + 1`, if it can be lifted. Therefore, we now have a precise check that the use level is 1 more than the bind level. Before this bug was not observable as you only had 0 and 1 contexts but it is easily evident when using explicit level imports. Fixes #26088 - - - - - 5144b22f by Andreas Klebinger at 2025-07-22T21:15:34-04:00 Add since tag and more docs for do-clever-arg-eta-expansion Fixes #26113 - - - - - c865623b by Andreas Klebinger at 2025-07-22T21:15:34-04:00 Add since tag for -fexpose-overloaded-unfoldings Fixes #26112 - - - - - 49a44ab7 by Simon Hengel at 2025-07-23T17:59:55+07:00 Refactor GHC.Driver.Errors.printMessages - - - - - 84711c39 by Simon Hengel at 2025-07-23T18:27:34+07:00 Respect `-fdiagnostics-as-json` for error messages from pre-processors (fixes #25480) - - - - - d046b5ab by Simon Hengel at 2025-07-24T06:12:05-04:00 Include the rendered message in -fdiagnostics-as-json output This implements #26173. - - - - - d2b89603 by Ben Gamari at 2025-07-24T06:12:47-04:00 rts/Interpreter: Factor out ctoi tuple info tables into data Instead of a massive case let's put this into data which we can reuse elsewhere. - - - - - 4bc78496 by Sebastian Graf at 2025-07-24T16:19:34-04:00 CprAnal: Detect recursive newtypes (#25944) While `cprTransformDataConWork` handles recursive data con workers, it did not detect the case when a newtype is responsible for the recursion. This is now detected in the `Cast` case of `cprAnal`. The same reproducer made it clear that `isRecDataCon` lacked congruent handling for `AppTy` and `CastTy`, now fixed. Furthermore, the new repro case T25944 triggered this bug via an infinite loop in `cprFix`, caused by the infelicity in `isRecDataCon`. While it should be much less likely to trigger such an infinite loop now that `isRecDataCon` has been fixed, I made sure to abort the loop after 10 iterations and emitting a warning instead. Fixes #25944. - - - - - 0a583689 by Sylvain Henry at 2025-07-24T16:20:26-04:00 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. - - - - - a49eca26 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Renaming around predicate types .. we were (as it turned out) abstracting over type-class selectors in SPECIALISATION rules! Wibble isEqPred - - - - - f80375dd by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Refactor of Specialise.hs This patch just tidies up `specHeader` a bit, removing one of its many results, and adding some comments. No change in behaviour. Also add a few more `HasDebugCallStack` contexts. - - - - - 1bd12371 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Improve treatment of SPECIALISE pragmas -- again! This MR does another major refactor of the way that SPECIALISE pragmas work, to fix #26115, #26116, #26117. * We now /always/ solve forall-constraints in an all-or-nothing way. See Note [Solving a Wanted forall-constraint] in GHC.Tc.Solver.Solve This means we might have unsolved quantified constraints, which need to be reported. See `inert_insts` in `getUnsolvedInerts`. * I refactored the short-cut solver for type classes to work by recursively calling the solver rather than by having a little baby solver that kept being not clever enough. See Note [Shortcut solving] in GHC.Tc.Solver.Dict * I totally rewrote the desugaring of SPECIALISE pragmas, again. The new story is in Note [Desugaring new-form SPECIALISE pragmas] in GHC.HsToCore.Binds Both old-form and new-form SPECIALISE pragmas now route through the same function `dsSpec_help`. The tricky function `decomposeRuleLhs` is now used only for user-written RULES, not for SPECIALISE pragmas. * I improved `solveOneFromTheOther` to account for rewriter sets. Previously it would solve a non-rewritten dict from a rewritten one. For equalities we were already dealing with this, in Some incidental refactoring * A small refactor: `ebv_tcvs` in `EvBindsBar` now has a list of coercions, rather than a set of tyvars. We just delay taking the free vars. * GHC.Core.FVs.exprFVs now returns /all/ free vars. Use `exprLocalFVs` for Local vars. Reason: I wanted another variant for /evidence/ variables. * Ues `EvId` in preference to `EvVar`. (Evidence variables are always Ids.) Rename `isEvVar` to `isEvId`. * I moved `inert_safehask` out of `InertCans` and into `InertSet` where it more properly belongs. Compiler-perf changes: * There was a palpable bug (#26117) which this MR fixes in newWantedEvVar, which bypassed all the subtle overlapping-Given and shortcutting logic. (See the new `newWantedEvVar`.) Fixing this but leads to extra dictionary bindings; they are optimised away quickly but they made CoOpt_Read allocate 3.6% more. * Hpapily T15164 improves. * The net compiler-allocation change is 0.0% Metric Decrease: T15164 Metric Increase: CoOpt_Read T12425 - - - - - 953fd8f1 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Solve forall-constraints immediately, or not at all This MR refactors the constraint solver to solve forall-constraints immediately, rather than emitting an implication constraint to be solved later. The most immediate motivation was that when solving quantified constraints in SPECIALISE pragmas, we really really don't want to leave behind half- solved implications. Also it's in tune with the approach of the new short-cut solver, which recursively invokes the solver. It /also/ saves quite a bit of plumbing; e.g - The `wl_implics` field of `WorkList` is gone, - The types of `solveSimpleWanteds` and friends are simplified. - An EvFun contains binding, rather than an EvBindsVar ref-cell that will in the future contain bindings. That makes `evVarsOfTerm` simpler. Much nicer. It also improves error messages a bit. All described in Note [Solving a Wanted forall-constraint] in GHC.Tc.Solver.Solve. One tiresome point: in the tricky case of `inferConstraintsCoerceBased` we make a forall-constraint. This we /do/ want to partially solve, so we can infer a suitable context. (I'd be quite happy to force the user to write a context, bt I don't want to change behavior.) So we want to generate an /implication/ constraint in `emitPredSpecConstraints` rather than a /forall-constraint/ as we were doing before. Discussed in (WFA3) of the above Note. Incidental refactoring * `GHC.Tc.Deriv.Infer.inferConstraints` was consulting the state monad for the DerivEnv that the caller had just consulted. Nicer to pass it as an argument I think, so I have done that. No change in behaviour. - - - - - 6921ab42 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Remove duplicated code in Ast.hs for evTermFreeVars This is just a tidy up. - - - - - 1165f587 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Small tc-tracing changes only - - - - - 0776ffe0 by Simon Hengel at 2025-07-26T04:54:20-04:00 Respect `-fdiagnostics-as-json` for core diagnostics (see #24113) - - - - - cc1116e0 by Andrew Lelechenko at 2025-07-26T04:55:01-04:00 docs: add since pragma to Data.List.NonEmpty.mapMaybe - - - - - ee2dc248 by Simon Hengel at 2025-07-31T06:25:35-04:00 Update comments on `OptKind` to reflect the code reality - - - - - b029633a by Wen Kokke at 2025-07-31T06:26:21-04:00 rts: Disable --eventlog-flush-interval unless compiled with -threaded. This commit fixes issue #26222: Using --eventlog-flush-interval with the non-threaded RTS leads to eventlog corruption. https://gitlab.haskell.org/ghc/ghc/-/issues/26222 This commit makes three changes when code is compiled against the non-threaded RTS: 1. It disables the --eventlog-flush-interval flag. 2. It disables the documentation for the --eventlog-flush-interval flag. 3. It disables the relevant state from RtsConfig and code from Timer. 4. It updates the entry for --eventlog-flush-interval in the users guide. - - - - - 31159f1d by Wen Kokke at 2025-07-31T06:26:21-04:00 rts: Split T20006 into tests with and without -threaded - - - - - 618687ef by Simon Hengel at 2025-07-31T06:27:03-04:00 docs/users_guide/win32-dlls.rst: Remove references to `readline` - - - - - 083e40f1 by Rodrigo Mesquita at 2025-08-01T04:38:23-04:00 debugger: Uniquely identify breakpoints by internal id Since b85b11994e0130ff2401dd4bbdf52330e0bcf776 (support inlining breakpoints), a breakpoint has been identified at runtime by *two* pairs of <module,index>. - The first, aka a 'BreakpointId', uniquely identifies a breakpoint in the source of a module by using the Tick index. A Tick index can index into ModBreaks.modBreaks_xxx to fetch source-level information about where that tick originated. - When a user specifies e.g. a line breakpoint using :break, we'll reverse engineer what a Tick index for that line - We update the `BreakArray` of that module (got from the LoaderState) at that tick index to `breakOn`. - A BCO we can stop at is headed by a BRK_FUN instruction. This instruction stores in an operand the `tick index` it is associated to. We look it up in the associated `BreakArray` (also an operand) and check wheter it was set to `breakOn`. - The second, aka the `ibi_info_mod` + `ibi_info_ix` of the `InternalBreakpointId`, uniquely index into the `imodBreaks_breakInfo` -- the information we gathered during code generation about the existing breakpoint *ocurrences*. - Note that with optimisation there may be many occurrences of the same source-tick-breakpoint across different modules. The `ibi_info_ix` is unique per occurrence, but the `bi_tick_ix` may be shared. See Note [Breakpoint identifiers] about this. - Note that besides the tick ids, info ids are also stored in `BRK_FUN` so the break handler can refer to the associated `CgBreakInfo`. In light of that, the driving changes come from the desire to have the info_id uniquely identify the breakpoint at runtime, and the source tick id being derived from it: - An InternalBreakpointId should uniquely identify a breakpoint just from the code-generation identifiers of `ibi_info_ix` and `ibi_info_mod`. So we drop `ibi_tick_mod` and `ibi_tick_ix`. - A BRK_FUN instruction need only record the "internal breakpoint id", not the tick-level id. So we drop the tick mod and tick index operands. - A BreakArray should be indexed by InternalBreakpointId rather than BreakpointId That means we need to do some more work when setting a breakpoint. Specifically, we need to figure out the internal ids (occurrences of a breakpoint) from the source-level BreakpointId we want to set the breakpoint at (recall :break refers to breaks at the source level). Besides this change being an improvement to the handling of breakpoints (it's clearer to have a single unique identifier than two competing ones), it unlocks the possibility of generating "internal" breakpoints during Cg (needed for #26042). It should also be easier to introduce multi-threaded-aware `BreakArrays` following this change (needed for #26064). Se also the new Note [ModBreaks vs InternalModBreaks] On i386-linux: ------------------------- Metric Decrease: interpreter_steplocal ------------------------- - - - - - bf03bbaa by Simon Hengel at 2025-08-01T04:39:05-04:00 Don't use MCDiagnostic for `ghcExit` This changes the error message of `ghcExit` from ``` <no location info>: error: Compilation had errors ``` to ``` Compilation had errors ``` - - - - - a889ec75 by Simon Hengel at 2025-08-01T04:39:05-04:00 Respect `-fdiagnostics-as-json` for driver diagnostics (see #24113) - - - - - 81577fe7 by Ben Gamari at 2025-08-02T04:29:39-04:00 configure: Allow override of CrossCompiling As noted in #26236, the current inference logic is a bit simplistic. In particular, there are many cases (e.g. building for a new libc) where the target and host triples may differ yet we are still able to run the produced artifacts as native code. Closes #26236. - - - - - 01136779 by Andreas Klebinger at 2025-08-02T04:30:20-04:00 rts: Support COFF BigObj files in archives. - - - - - 1f9e4f54 by Stephen Morgan at 2025-08-03T15:14:08+10:00 refactor: Modify Data.List.sortOn to use (>) instead of compare. (#26184) This lets a more efficient (>) operation be used if one exists. This is technically a breaking change for malformed Ord instances, where x > y is not equivalent to compare x y == GT. Discussed by the CLC in issue #332: https://github.com/haskell/core-libraries-committee/issues/332 - - - - - 4f6bc9cf by fendor at 2025-08-04T17:50:06-04:00 Revert "base: Expose Backtraces constructor and fields" This reverts commit 17db44c5b32fff82ea988fa4f1a233d1a27bdf57. - - - - - bcdec657 by Zubin Duggal at 2025-08-05T10:37:29+05:30 compiler: Export a version of `newNameCache` that is not prone to footguns. `newNameCache` must be initialized with both a non-"reserved" unique tag, as well as a list of known key names. Failing to do so results in hard to debug unique conflicts. It is difficult for API users to tell which unique tags are safe to use. So instead of leaving this up to the user to decide, we now export a version of `newNameCache` which uses a guaranteed non-reserved unique tag. In fact, this is now the way the unique tag is initialized for all invocations of the compiler. The original version of `newNameCache` is now exported as `newNameCache'` for advanced users. We also deprecate `initNameCache` as it is also prone to footguns and is completely subsumed in functionality by `newNameCache` and `newNameCache'`. Fixes #26135 and #26055 - - - - - 57d3b4a8 by Andrew Lelechenko at 2025-08-05T18:36:31-04:00 hadrian: bump Stackage snapshot to LTS 24.2 / GHC 9.10.2 In line with #25693 we should use GHC 9.10 as a boot compiler, while Hadrian stack.yaml was stuck on GHC 9.6. - - - - - c2a78cea by Peng Fan at 2025-08-05T18:37:27-04:00 NCG/LA64: implement atomic write with finer-grained DBAR hints Signed-off-by: Peng Fan <fanpeng(a)loongson.cn> - - - - - 95231c8e by Teo Camarasu at 2025-08-06T08:35:58-04:00 CODEOWNERS: add CLC as codeowner of base We also remove hvr, since I think he is no longer active - - - - - 77df0ded by Andrew Lelechenko at 2025-08-06T08:36:39-04:00 Bump submodule text to 2.1.3 - - - - - 8af260d0 by Nikolaos Chatzikonstantinou at 2025-08-06T08:37:23-04:00 docs: fix internal import in getopt examples This external-facing doc example shouldn't mention GHC internals when using 'fromMaybe'. - - - - - 69cc16ca by Marc Scholten at 2025-08-06T15:51:28-04:00 README: Add note on ghc.nix - - - - - 93a2f450 by Daniel Díaz at 2025-08-06T15:52:14-04:00 Link to the "Strict Bindings" docs from the linear types docs Strict Bidings are relevant for the kinds of multiplicity annotations linear lets support. - - - - - 246b7853 by Matthew Pickering at 2025-08-07T06:58:30-04:00 level imports: Check the level of exported identifiers The level imports specification states that exported identifiers have to be at level 0. This patch adds the requird level checks that all explicitly mentioned identifiers occur at level 0. For implicit export specifications (T(..) and module B), only level 0 identifiers are selected for re-export. ghc-proposal: https://github.com/ghc-proposals/ghc-proposals/pull/705 Fixes #26090 - - - - - 358bc4fc by fendor at 2025-08-07T06:59:12-04:00 Bump GHC on darwin CI to 9.10.1 - - - - - 1903ae35 by Matthew Pickering at 2025-08-07T12:21:10+01:00 ipe: Place strings and metadata into specific .ipe section By placing the .ipe metadata into a specific section it can be stripped from the final binary if desired. ``` objcopy --remove-section .ipe <binary> upx <binary> ``` Towards #21766 - - - - - c80dd91c by Matthew Pickering at 2025-08-07T12:22:42+01:00 ipe: Place magic word at the start of entries in the .ipe section The magic word "IPE\nIPE\n" is placed at the start of .ipe sections, then if the section is stripped, we can check whether the section starts with the magic word or not to determine whether there is metadata present or not. Towards #21766 - - - - - cab42666 by Matthew Pickering at 2025-08-07T12:22:42+01:00 ipe: Use stable IDs for IPE entries IPEs have historically been indexed and reported by their address. This makes it impossible to compare profiles between runs, since the addresses may change (due to ASLR) and also makes it tricky to separate out the IPE map from the binary. This small patch adds a stable identifier for each IPE entry. The stable identifier is a single 64 bit word. The high-bits are a per-module identifier and the low bits identify which entry in each module. 1. When a node is added into the IPE buffer it is assigned a unique identifier from an incrementing global counter. 2. Each entry already has an index by it's position in the `IpeBufferListNode`. The two are combined together by the `IPE_ENTRY_KEY` macro. Info table profiling uses the stable identifier rather than the address of the info table. The benefits of this change are: * Profiles from different runs can be easily compared * The metadata can be extracted from the binary (via the eventlog for example) and then stripped from the executable. Fixes #21766 - - - - - 2860a9a5 by Simon Peyton Jones at 2025-08-07T20:29:18-04:00 In TcSShortCut, typechecker plugins should get empty Givens Solving in TcShortCut mode means /ignoring the Givens/. So we should not pass them to typechecker plugins! Fixes #26258. This is a fixup to the earlier MR: commit 1bd12371feacc52394a0e660ef9349f9e8ee1c06 Author: Simon Peyton Jones <simon.peytonjones(a)gmail.com> Date: Mon Jul 21 10:04:49 2025 +0100 Improve treatment of SPECIALISE pragmas -- again! - - - - - 2157db2d by sterni at 2025-08-08T15:32:39-04:00 hadrian: enable terminfo if --with-curses-* flags are given The GHC make build system used to support WITH_TERMINFO in ghc.mk which allowed controlling whether to build GHC with terminfo or not. hadrian has replaced this with a system where this is effectively controlled by the cross-compiling setting (the default WITH_TERMINFO value was bassed on CrossCompiling, iirc). This behavior is undesireable in some cases and there is not really a good way to work around it. Especially for downstream packagers, modifying this via UserSettings is not really feasible since such a source file has to be kept in sync with Settings/Default.hs manually since it can't import Settings.Default or any predefined Flavour definitions. To avoid having to add a new setting to cfg/system.config and/or a new configure flag (though I'm happy to implement both if required), I've chosen to take --with-curses-* being set explicitly as an indication that the user wants to have terminfo enabled. This would work for Nixpkgs which sets these flags [1] as well as haskell.nix [2] (which goes to some extreme measures [3] [4] to force terminfo in all scenarios). In general, I'm an advocate for making the GHC build be the same for native and cross insofar it is possible since it makes packaging GHC and Haskell related things while still supporting cross much less compilicated. A more minimal GHC with reduced dependencies should probably be a specific flavor, not the default. Partially addresses #26288 by forcing terminfo to be built if the user explicitly passes configure flags related to it. However, it isn't built by default when cross-compiling yet nor is there an explicit way to control the package being built. [1]: https://github.com/NixOS/nixpkgs/blob/3a7266fcefcb9ce353df49ba3f292d0644376… [2]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa… [3]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa… [4]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa… - - - - - b3c31488 by David Feuer at 2025-08-08T15:33:21-04:00 Add default QuasiQuoters Add `defaultQuasiQuoter` and `namedDefaultQuasiQuoter` to make it easier to write `QuasiQuoters` that give helpful error messages when they're used in inappropriate contexts. Closes #24434. - - - - - 03555ed8 by Sylvain Henry at 2025-08-10T22:20:57-04:00 Handle non-fractional CmmFloats in Cmm's CBE (#26229) Since f8d9d016305be355f518c141f6c6d4826f2de9a2, toRational for Float and Double converts float's infinity and NaN into Rational's infinity and NaN (respectively 1%0 and 0%0). Cmm CommonBlockEliminator hashing function needs to take these values into account as they can appear as literals now. See added testcase. - - - - - 6c956af3 by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00 Fix extensions list in `DoAndIfThenElse` docs - - - - - 6dc420b1 by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00 Document status of `RelaxedPolyRec` extension This adds a brief extension page explaining the status of the `RelaxedPolyRec` extension. The behaviour of this mode is already explained elsewhere, so this page is mainly for completeness so that various lists of extensions have somewhere to point to for this flag. Fixes #18630 - - - - - 18036d52 by Simon Peyton Jones at 2025-08-11T11:31:20-04:00 Take more care in zonkEqTypes on AppTy/AppTy This patch fixes #26256. See Note [zonkEqTypes and the PKTI] in GHC.Tc.Solver.Equality - - - - - c8d76a29 by Zubin Duggal at 2025-08-11T11:32:02-04:00 ci: upgrade bootstrap compiler on windows to 9.10.1 - - - - - 34fc50c1 by Ben Gamari at 2025-08-11T13:36:25-04:00 Kill IOPort# This type is unnecessary, having been superceded by `MVar` and a rework of WinIO's blocking logic. See #20947. See https://github.com/haskell/core-libraries-committee/issues/213. - - - - - 56b32c5a by sheaf at 2025-08-12T10:00:19-04:00 Improve deep subsumption This commit improves the DeepSubsumption sub-typing implementation in GHC.Tc.Utils.Unify.tc_sub_type_deep by being less eager to fall back to unification. For example, we now are properly able to prove the subtyping relationship ((∀ a. a->a) -> Int) -> Bool <= β[tau] Bool for an unfilled metavariable β. In this case (with an AppTy on the right), we used to fall back to unification. No longer: now, given that the LHS is a FunTy and that the RHS is a deep rho type (does not need any instantiation), we try to make the RHS into a FunTy, viz. β := (->) γ We can then continue using covariance & contravariance of the function arrow, which allows us to prove the subtyping relationship, instead of trying to unify which would cause us to error out with: Couldn't match expected type ‘β’ with actual type ‘(->) ((∀ a. a -> a) -> Int) See Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify. The other main improvement in this patch concerns type inference. The main subsumption logic happens (before & after this patch) in GHC.Tc.Gen.App.checkResultTy. However, before this patch, all of the DeepSubsumption logic only kicked in in 'check' mode, not in 'infer' mode. This patch adds deep instantiation in the 'infer' mode of checkResultTy when we are doing deep subsumption, which allows us to accept programs such as: f :: Int -> (forall a. a->a) g :: Int -> Bool -> Bool test1 b = case b of True -> f False -> g test2 b = case b of True -> g False -> f See Note [Deeply instantiate in checkResultTy when inferring]. Finally, we add representation-polymorphism checks to ensure that the lambda abstractions we introduce when doing subsumption obey the representation polymorphism invariants of Note [Representation polymorphism invariants] in GHC.Core. See Note [FunTy vs FunTy case in tc_sub_type_deep]. This is accompanied by a courtesy change to `(<.>) :: HsWrapper -> HsWrapper -> HsWrapper`, adding the equation: WpCast c1 <.> WpCast c2 = WpCast (c1 `mkTransCo` c2) This is useful because mkWpFun does not introduce an eta-expansion when both of the argument & result wrappers are casts; so this change allows us to avoid introducing lambda abstractions when casts suffice. Fixes #26225 - - - - - d175aff8 by Sylvain Henry at 2025-08-12T10:01:31-04:00 Add regression test for #18619 - - - - - a3983a26 by Sylvain Henry at 2025-08-12T10:02:20-04:00 RTS: remove some TSAN annotations (#20464) Use RELAXED_LOAD_ALWAYS macro instead. - - - - - 0434af81 by Ben Gamari at 2025-08-12T10:03:02-04:00 Bump time submodule to 1.15 Also required bumps of Cabal, directory, and hpc. - - - - - 62899117 by Florian Ragwitz at 2025-08-13T21:01:34-04:00 Extend record-selector usage ticking to all binds using a record field This extends the previous handling of ticking for RecordWildCards and NamedFieldPuns to all var bindings that involve record selectors. Note that certain patterns such as `Foo{foo = 42}` will currently not tick the `foo` selector, as ticking is triggered by `HsVar`s. Closes #26191. - - - - - b37b3af7 by Florian Ragwitz at 2025-08-13T21:01:34-04:00 Add release notes for 9.16.1 and move description of latest HPC changes there. - - - - - a5e4b7d9 by Ben Gamari at 2025-08-13T21:02:18-04:00 rts: Clarify rationale for undefined atomic wrappers Since c06e3f46d24ef69f3a3d794f5f604cb8c2a40cbc the RTS has declared various atomic operation wrappers defined by ghc-internal as undefined. While the rationale for this isn't clear from the commit message, I believe that this is necessary due to the unregisterised backend. Specifically, the code generator will reference these symbols when compiling RTS Cmm sources. - - - - - 50842f83 by Andreas Klebinger at 2025-08-13T21:03:01-04:00 Make unexpected LLVM versions a warning rather than an error. Typically a newer LLVM version *will* work so erroring out if a user uses a newer LLVM version is too aggressive. Fixes #25915 - - - - - c91e2650 by fendor at 2025-08-13T21:03:43-04:00 Store `StackTrace` and `StackSnapshot` in `Backtraces` Instead of decoding the stack traces when collecting the `Backtraces`, defer this decoding until actually showing the `Backtraces`. This allows users to customise how `Backtraces` are displayed by using a custom implementation of `displayExceptionWithInfo`, overwriting the default implementation for `Backtraces` (`displayBacktraces`). - - - - - dee28cdd by fendor at 2025-08-13T21:03:43-04:00 Allow users to customise the collection of exception annotations Add a global `CollectExceptionAnnotationMechanism` which determines how `ExceptionAnnotation`s are collected upon throwing an `Exception`. This API is exposed via `ghc-experimental`. By overriding how we collect `Backtraces`, we can control how the `Backtraces` are displayed to the user by newtyping `Backtraces` and giving a different instance for `ExceptionAnnotation`. A concrete use-case for this feature is allowing us to experiment with alternative stack decoders, without having to modify `base`, which take additional information from the stack frames. This commit does not modify how `Backtraces` are currently collected or displayed. - - - - - 66024722 by fendor at 2025-08-13T21:03:43-04:00 Expose Backtraces internals from ghc-experimental Additionally, expose the same API `base:Control.Exception.Backtrace` to make it easier to use as a drop-in replacement. - - - - - a766286f by Reed Mullanix at 2025-08-13T21:04:36-04:00 ghc-internal: Fix naturalAndNot for NB/NS case When the first argument to `naturalAndNot` is larger than a `Word` and the second is `Word`-sized, `naturalAndNot` will truncate the result: ``` >>> naturalAndNot ((2 ^ 65) .|. (2 ^ 3)) (2 ^ 3) 0 ``` In contrast, `naturalAndNot` does not truncate when both arguments are larger than a `Word`, so this appears to be a bug. Luckily, the fix is pretty easy: we just need to call `bigNatAndNotWord#` instead of truncating. Fixes #26230 - - - - - 3506fa7d by Simon Hengel at 2025-08-13T21:05:18-04:00 Report -pgms as a deprecated flag (instead of reporting an unspecific warning) Before: on the commandline: warning: Object splitting was removed in GHC 8.8 After: on the commandline: warning: [GHC-53692] [-Wdeprecated-flags] -pgms is deprecated: Object splitting was removed in GHC 8.8 - - - - - 51c701fe by Zubin Duggal at 2025-08-13T21:06:00-04:00 testsuite: Be more permissive when filtering out GNU_PROPERTY_TYPE linker warnings The warning text is slightly different with ld.bfd. Fixes #26249 - - - - - dfe6f464 by Simon Hengel at 2025-08-13T21:06:43-04:00 Refactoring: Don't misuse `MCDiagnostic` for lint messages `MCDiagnostic` is meant to be used for compiler diagnostics. Any code that creates `MCDiagnostic` directly, without going through `GHC.Driver.Errors.printMessage`, side steps `-fdiagnostics-as-json` (see e.g. !14475, !14492 !14548). To avoid this in the future I want to control more narrowly who creates `MCDiagnostic` (see #24113). Some parts of the compiler use `MCDiagnostic` purely for formatting purposes, without creating any real compiler diagnostics. This change introduces a helper function, `formatDiagnostic`, that can be used in such cases instead of constructing `MCDiagnostic`. - - - - - a8b2fbae by Teo Camarasu at 2025-08-13T21:07:24-04:00 rts: ensure MessageBlackHole.link is always a valid closure We turn a MessageBlackHole into an StgInd in wakeBlockingQueue(). Therefore it's important that the link field, which becomes the indirection field, always points to a valid closure. It's unclear whether it's currently possible for the previous behaviour to lead to a crash, but it's good to be consistent about this invariant nonetheless. Co-authored-by: Andreas Klebinger <klebinger.andreas(a)gmx.at> - - - - - 4021181e by Teo Camarasu at 2025-08-13T21:07:24-04:00 rts: spin if we see a WHITEHOLE in messageBlackHole When a BLACKHOLE gets cancelled in raiseAsync, we indirect to a THUNK. GC can then shortcut this, replacing our BLACKHOLE with a fresh THUNK. This THUNK is not guaranteed to have a valid indirectee field. If at the same time, a message intended for the previous BLACKHOLE is processed and concurrently we BLACKHOLE the THUNK, thus temporarily turning it into a WHITEHOLE, we can get a segfault, since we look at the undefined indirectee field of the THUNK The fix is simple: spin if we see a WHITEHOLE, and it will soon be replaced with a valid BLACKHOLE. Resolves #26205 - - - - - 1107af89 by Oleg Grenrus at 2025-08-13T21:08:06-04:00 Allow defining HasField instances for naughty fields Resolves #26295 ... as HasField solver doesn't solve for fields with "naughty" selectors, we could as well allow defining HasField instances for these fields. - - - - - 020e7587 by Sylvain Henry at 2025-08-13T21:09:00-04:00 Fix Data.List unqualified import warning - - - - - 3d8044e7 by Sjoerd Visscher at 2025-08-18T16:09:41+02:00 Calculate multiplicity for record selector functions Until now record selector functions always had multiplicity Many, but when all the other fields have been declared with multiplicity Many (including the case when there are no other fields), then the selector function is allowed to be used linearly too, as it is allowed to discard all the other fields. Since in that case the multiplicity can be both One and Many, the selector function is made multiplicity-polymorphic. See Note [Multiplicity and partial selectors] Fixes #18570 - - - - - 0da672c8 by Sjoerd Visscher at 2025-08-18T16:09:41+02:00 Fix field type mismatch error handling Errors in check_fields don't fail in the monad. (This commit also makes this more clear in the code.) So they didn't trigger the recovery code in checkValidTyCl. Fixes issue #26149 - - - - - 602 changed files: - .gitlab-ci.yml - .gitlab/ci.sh - .gitlab/common.sh - .gitlab/darwin/toolchain.nix - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py - CODEOWNERS - README.md - compiler/GHC.hs - compiler/GHC/Builtin/Names.hs - compiler/GHC/Builtin/PrimOps/Ids.hs - compiler/GHC/Builtin/Types/Prim.hs - compiler/GHC/Builtin/primops.txt.pp - compiler/GHC/ByteCode/Asm.hs - + compiler/GHC/ByteCode/Breakpoints.hs - compiler/GHC/ByteCode/Instr.hs - compiler/GHC/ByteCode/Linker.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Cmm.hs - compiler/GHC/Cmm/CommonBlockElim.hs - compiler/GHC/CmmToAsm/LA64/CodeGen.hs - compiler/GHC/CmmToAsm/LA64/Instr.hs - compiler/GHC/CmmToAsm/LA64/Ppr.hs - compiler/GHC/CmmToAsm/PPC/Ppr.hs - compiler/GHC/CmmToAsm/Ppr.hs - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToAsm/X86/Instr.hs - compiler/GHC/CmmToAsm/X86/Ppr.hs - compiler/GHC/CmmToLlvm/Data.hs - compiler/GHC/Core.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/FVs.hs - compiler/GHC/Core/LateCC/OverloadedCalls.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Map/Expr.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/CprAnal.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/Monad.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/Pipeline.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/Opt/SpecConstr.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/Ppr.hs - compiler/GHC/Core/Predicate.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/Subst.hs - compiler/GHC/Core/Tidy.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Core/Unfold/Make.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/CoreToIface.hs - compiler/GHC/CoreToStg.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/CmdLine.hs - compiler/GHC/Driver/Config.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Env.hs - compiler/GHC/Driver/Env/Types.hs - compiler/GHC/Driver/Errors.hs - compiler/GHC/Driver/Errors/Ppr.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Main.hs - compiler/GHC/Driver/Make.hs - compiler/GHC/Driver/Pipeline/Execute.hs - compiler/GHC/Driver/Session.hs - + compiler/GHC/Driver/Session/Inspect.hs - compiler/GHC/Hs/ImpExp.hs - compiler/GHC/HsToCore.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Breakpoints.hs - compiler/GHC/HsToCore/Errors/Ppr.hs - compiler/GHC/HsToCore/Pmc/Solver/Types.hs - compiler/GHC/HsToCore/Ticks.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Iface/Load.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Iface/Tidy.hs - compiler/GHC/IfaceToCore.hs - compiler/GHC/Linker/Loader.hs - compiler/GHC/Linker/Types.hs - compiler/GHC/Parser.y - compiler/GHC/Rename/Splice.hs - compiler/GHC/Runtime/Debugger/Breakpoints.hs - compiler/GHC/Runtime/Eval.hs - compiler/GHC/Runtime/Eval/Types.hs - compiler/GHC/Runtime/Interpreter.hs - compiler/GHC/Runtime/Interpreter/Types.hs - compiler/GHC/Stg/BcPrep.hs - compiler/GHC/Stg/FVs.hs - compiler/GHC/Stg/Lint.hs - compiler/GHC/StgToByteCode.hs - compiler/GHC/StgToCmm/InfoTableProv.hs - compiler/GHC/StgToCmm/Prim.hs - compiler/GHC/StgToJS/Prim.hs - compiler/GHC/SysTools/Process.hs - compiler/GHC/SysTools/Tasks.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/Gen/App.hs - compiler/GHC/Tc/Gen/Export.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Gen/HsType.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Gen/Splice.hs - compiler/GHC/Tc/Instance/Family.hs - compiler/GHC/Tc/Module.hs - compiler/GHC/Tc/Solver.hs - compiler/GHC/Tc/Solver/Default.hs - compiler/GHC/Tc/Solver/Dict.hs - compiler/GHC/Tc/Solver/Equality.hs - compiler/GHC/Tc/Solver/InertSet.hs - compiler/GHC/Tc/Solver/Monad.hs - compiler/GHC/Tc/Solver/Rewrite.hs - compiler/GHC/Tc/Solver/Solve.hs - + compiler/GHC/Tc/Solver/Solve.hs-boot - compiler/GHC/Tc/Solver/Types.hs - compiler/GHC/Tc/TyCl.hs - compiler/GHC/Tc/TyCl/PatSyn.hs - compiler/GHC/Tc/TyCl/Utils.hs - compiler/GHC/Tc/Types/Constraint.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Types/Origin.hs - compiler/GHC/Tc/Utils/Concrete.hs - compiler/GHC/Tc/Utils/Monad.hs - compiler/GHC/Tc/Utils/TcMType.hs - compiler/GHC/Tc/Utils/TcType.hs - compiler/GHC/Tc/Utils/Unify.hs - compiler/GHC/Tc/Validity.hs - compiler/GHC/Tc/Zonk/Type.hs - − compiler/GHC/Types/Breakpoint.hs - compiler/GHC/Types/Error.hs - compiler/GHC/Types/Id/Make.hs - compiler/GHC/Types/Name/Cache.hs - compiler/GHC/Types/Name/Reader.hs - compiler/GHC/Types/Tickish.hs - compiler/GHC/Types/Var.hs - compiler/GHC/Unit/Env.hs - compiler/GHC/Unit/Home/Graph.hs - compiler/GHC/Unit/Home/PackageTable.hs - compiler/GHC/Unit/Module/Graph.hs - compiler/GHC/Unit/Module/ModGuts.hs - compiler/GHC/Utils/Error.hs - compiler/GHC/Utils/Logger.hs - compiler/Setup.hs - compiler/ghc.cabal.in - configure.ac - distrib/configure.ac.in - − docs/users_guide/9.14.1-notes.rst - + docs/users_guide/9.16.1-notes.rst - docs/users_guide/bugs.rst - docs/users_guide/conf.py - docs/users_guide/debug-info.rst - + docs/users_guide/diagnostics-as-json-schema-1_2.json - docs/users_guide/eventlog-formats.rst - docs/users_guide/expected-undocumented-flags.txt - docs/users_guide/exts/doandifthenelse.rst - docs/users_guide/exts/ffi.rst - docs/users_guide/exts/linear_types.rst - + docs/users_guide/exts/relaxed_poly_rec.rst - docs/users_guide/exts/strict.rst - docs/users_guide/exts/types.rst - docs/users_guide/ghci.rst - docs/users_guide/profiling.rst - docs/users_guide/release-notes.rst - docs/users_guide/runtime_control.rst - docs/users_guide/using-optimisation.rst - docs/users_guide/using.rst - docs/users_guide/win32-dlls.rst - ghc/GHCi/UI.hs - ghc/GHCi/UI/Exception.hs - ghc/GHCi/UI/Monad.hs - ghc/GHCi/UI/Print.hs - ghc/ghc-bin.cabal.in - 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utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs - utils/haddock/haddock-api/src/Haddock/Types.hs - utils/haddock/haddock-library/haddock-library.cabal - utils/haddock/haddock-test/haddock-test.cabal - utils/haddock/haddock-test/src/Test/Haddock/Config.hs - utils/haddock/haddock.cabal - utils/haddock/html-test/ref/Bug1004.html - + utils/haddock/html-test/ref/Bug25739.html - utils/haddock/html-test/ref/Bug294.html - + utils/haddock/html-test/src/Bug25739.hs - utils/hsc2hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/57b9810e8625de06d82f9ffb0d5c07… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/57b9810e8625de06d82f9ffb0d5c07… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][ghc-9.14] gitlab-ci: Allow FreeBSD jobs to fail
by Ben Gamari (＠bgamari) 18 Aug '25

18 Aug '25

Ben Gamari pushed to branch ghc-9.14 at Glasgow Haskell Compiler / GHC Commits: f080dec4 by Ben Gamari at 2025-08-17T11:33:48-04:00 gitlab-ci: Allow FreeBSD jobs to fail Due to #26303. - - - - - 2 changed files: - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml Changes: ===================================== .gitlab/generate-ci/gen_ci.hs ===================================== @@ -1235,7 +1235,7 @@ darwin = freebsd_jobs :: [JobGroup Job] freebsd_jobs = - [ addValidateRule FreeBSDLabel (standardBuilds Amd64 FreeBSD14) + [ allowFailureGroup (addValidateRule FreeBSDLabel (standardBuilds Amd64 FreeBSD14)) ] alpine_x86 :: [JobGroup Job] ===================================== .gitlab/jobs.yaml ===================================== @@ -1415,7 +1415,7 @@ ".gitlab/ci.sh clean", "cat ci_timings.txt" ], - "allow_failure": false, + "allow_failure": true, "artifacts": { "expire_in": "8 weeks", "paths": [ @@ -4303,7 +4303,7 @@ ".gitlab/ci.sh clean", "cat ci_timings.txt" ], - "allow_failure": false, + "allow_failure": true, "artifacts": { "expire_in": "1 year", "paths": [ @@ -5730,7 +5730,7 @@ ".gitlab/ci.sh clean", "cat ci_timings.txt" ], - "allow_failure": false, + "allow_failure": true, "artifacts": { "expire_in": "2 weeks", "paths": [ View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f080dec404fd6d46ad06b052d9366ff… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f080dec404fd6d46ad06b052d9366ff… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc] Deleted branch wip/backports-9.14
by Ben Gamari (＠bgamari) 18 Aug '25

18 Aug '25

Ben Gamari deleted branch wip/backports-9.14 at Glasgow Haskell Compiler / GHC -- You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/T26267] 53 commits: compiler: Export a version of `newNameCache` that is not prone to footguns.
by Ben Gamari (＠bgamari) 18 Aug '25

18 Aug '25

Ben Gamari pushed to branch wip/T26267 at Glasgow Haskell Compiler / GHC Commits: bcdec657 by Zubin Duggal at 2025-08-05T10:37:29+05:30 compiler: Export a version of `newNameCache` that is not prone to footguns. `newNameCache` must be initialized with both a non-"reserved" unique tag, as well as a list of known key names. Failing to do so results in hard to debug unique conflicts. It is difficult for API users to tell which unique tags are safe to use. So instead of leaving this up to the user to decide, we now export a version of `newNameCache` which uses a guaranteed non-reserved unique tag. In fact, this is now the way the unique tag is initialized for all invocations of the compiler. The original version of `newNameCache` is now exported as `newNameCache'` for advanced users. We also deprecate `initNameCache` as it is also prone to footguns and is completely subsumed in functionality by `newNameCache` and `newNameCache'`. Fixes #26135 and #26055 - - - - - 57d3b4a8 by Andrew Lelechenko at 2025-08-05T18:36:31-04:00 hadrian: bump Stackage snapshot to LTS 24.2 / GHC 9.10.2 In line with #25693 we should use GHC 9.10 as a boot compiler, while Hadrian stack.yaml was stuck on GHC 9.6. - - - - - c2a78cea by Peng Fan at 2025-08-05T18:37:27-04:00 NCG/LA64: implement atomic write with finer-grained DBAR hints Signed-off-by: Peng Fan <fanpeng(a)loongson.cn> - - - - - 95231c8e by Teo Camarasu at 2025-08-06T08:35:58-04:00 CODEOWNERS: add CLC as codeowner of base We also remove hvr, since I think he is no longer active - - - - - 77df0ded by Andrew Lelechenko at 2025-08-06T08:36:39-04:00 Bump submodule text to 2.1.3 - - - - - 8af260d0 by Nikolaos Chatzikonstantinou at 2025-08-06T08:37:23-04:00 docs: fix internal import in getopt examples This external-facing doc example shouldn't mention GHC internals when using 'fromMaybe'. - - - - - 69cc16ca by Marc Scholten at 2025-08-06T15:51:28-04:00 README: Add note on ghc.nix - - - - - 93a2f450 by Daniel Díaz at 2025-08-06T15:52:14-04:00 Link to the "Strict Bindings" docs from the linear types docs Strict Bidings are relevant for the kinds of multiplicity annotations linear lets support. - - - - - 246b7853 by Matthew Pickering at 2025-08-07T06:58:30-04:00 level imports: Check the level of exported identifiers The level imports specification states that exported identifiers have to be at level 0. This patch adds the requird level checks that all explicitly mentioned identifiers occur at level 0. For implicit export specifications (T(..) and module B), only level 0 identifiers are selected for re-export. ghc-proposal: https://github.com/ghc-proposals/ghc-proposals/pull/705 Fixes #26090 - - - - - 358bc4fc by fendor at 2025-08-07T06:59:12-04:00 Bump GHC on darwin CI to 9.10.1 - - - - - 1903ae35 by Matthew Pickering at 2025-08-07T12:21:10+01:00 ipe: Place strings and metadata into specific .ipe section By placing the .ipe metadata into a specific section it can be stripped from the final binary if desired. ``` objcopy --remove-section .ipe <binary> upx <binary> ``` Towards #21766 - - - - - c80dd91c by Matthew Pickering at 2025-08-07T12:22:42+01:00 ipe: Place magic word at the start of entries in the .ipe section The magic word "IPE\nIPE\n" is placed at the start of .ipe sections, then if the section is stripped, we can check whether the section starts with the magic word or not to determine whether there is metadata present or not. Towards #21766 - - - - - cab42666 by Matthew Pickering at 2025-08-07T12:22:42+01:00 ipe: Use stable IDs for IPE entries IPEs have historically been indexed and reported by their address. This makes it impossible to compare profiles between runs, since the addresses may change (due to ASLR) and also makes it tricky to separate out the IPE map from the binary. This small patch adds a stable identifier for each IPE entry. The stable identifier is a single 64 bit word. The high-bits are a per-module identifier and the low bits identify which entry in each module. 1. When a node is added into the IPE buffer it is assigned a unique identifier from an incrementing global counter. 2. Each entry already has an index by it's position in the `IpeBufferListNode`. The two are combined together by the `IPE_ENTRY_KEY` macro. Info table profiling uses the stable identifier rather than the address of the info table. The benefits of this change are: * Profiles from different runs can be easily compared * The metadata can be extracted from the binary (via the eventlog for example) and then stripped from the executable. Fixes #21766 - - - - - 2860a9a5 by Simon Peyton Jones at 2025-08-07T20:29:18-04:00 In TcSShortCut, typechecker plugins should get empty Givens Solving in TcShortCut mode means /ignoring the Givens/. So we should not pass them to typechecker plugins! Fixes #26258. This is a fixup to the earlier MR: commit 1bd12371feacc52394a0e660ef9349f9e8ee1c06 Author: Simon Peyton Jones <simon.peytonjones(a)gmail.com> Date: Mon Jul 21 10:04:49 2025 +0100 Improve treatment of SPECIALISE pragmas -- again! - - - - - 2157db2d by sterni at 2025-08-08T15:32:39-04:00 hadrian: enable terminfo if --with-curses-* flags are given The GHC make build system used to support WITH_TERMINFO in ghc.mk which allowed controlling whether to build GHC with terminfo or not. hadrian has replaced this with a system where this is effectively controlled by the cross-compiling setting (the default WITH_TERMINFO value was bassed on CrossCompiling, iirc). This behavior is undesireable in some cases and there is not really a good way to work around it. Especially for downstream packagers, modifying this via UserSettings is not really feasible since such a source file has to be kept in sync with Settings/Default.hs manually since it can't import Settings.Default or any predefined Flavour definitions. To avoid having to add a new setting to cfg/system.config and/or a new configure flag (though I'm happy to implement both if required), I've chosen to take --with-curses-* being set explicitly as an indication that the user wants to have terminfo enabled. This would work for Nixpkgs which sets these flags [1] as well as haskell.nix [2] (which goes to some extreme measures [3] [4] to force terminfo in all scenarios). In general, I'm an advocate for making the GHC build be the same for native and cross insofar it is possible since it makes packaging GHC and Haskell related things while still supporting cross much less compilicated. A more minimal GHC with reduced dependencies should probably be a specific flavor, not the default. Partially addresses #26288 by forcing terminfo to be built if the user explicitly passes configure flags related to it. However, it isn't built by default when cross-compiling yet nor is there an explicit way to control the package being built. [1]: https://github.com/NixOS/nixpkgs/blob/3a7266fcefcb9ce353df49ba3f292d0644376… [2]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa… [3]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa… [4]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa… - - - - - b3c31488 by David Feuer at 2025-08-08T15:33:21-04:00 Add default QuasiQuoters Add `defaultQuasiQuoter` and `namedDefaultQuasiQuoter` to make it easier to write `QuasiQuoters` that give helpful error messages when they're used in inappropriate contexts. Closes #24434. - - - - - 03555ed8 by Sylvain Henry at 2025-08-10T22:20:57-04:00 Handle non-fractional CmmFloats in Cmm's CBE (#26229) Since f8d9d016305be355f518c141f6c6d4826f2de9a2, toRational for Float and Double converts float's infinity and NaN into Rational's infinity and NaN (respectively 1%0 and 0%0). Cmm CommonBlockEliminator hashing function needs to take these values into account as they can appear as literals now. See added testcase. - - - - - 6c956af3 by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00 Fix extensions list in `DoAndIfThenElse` docs - - - - - 6dc420b1 by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00 Document status of `RelaxedPolyRec` extension This adds a brief extension page explaining the status of the `RelaxedPolyRec` extension. The behaviour of this mode is already explained elsewhere, so this page is mainly for completeness so that various lists of extensions have somewhere to point to for this flag. Fixes #18630 - - - - - 18036d52 by Simon Peyton Jones at 2025-08-11T11:31:20-04:00 Take more care in zonkEqTypes on AppTy/AppTy This patch fixes #26256. See Note [zonkEqTypes and the PKTI] in GHC.Tc.Solver.Equality - - - - - c8d76a29 by Zubin Duggal at 2025-08-11T11:32:02-04:00 ci: upgrade bootstrap compiler on windows to 9.10.1 - - - - - 34fc50c1 by Ben Gamari at 2025-08-11T13:36:25-04:00 Kill IOPort# This type is unnecessary, having been superceded by `MVar` and a rework of WinIO's blocking logic. See #20947. See https://github.com/haskell/core-libraries-committee/issues/213. - - - - - 56b32c5a by sheaf at 2025-08-12T10:00:19-04:00 Improve deep subsumption This commit improves the DeepSubsumption sub-typing implementation in GHC.Tc.Utils.Unify.tc_sub_type_deep by being less eager to fall back to unification. For example, we now are properly able to prove the subtyping relationship ((∀ a. a->a) -> Int) -> Bool <= β[tau] Bool for an unfilled metavariable β. In this case (with an AppTy on the right), we used to fall back to unification. No longer: now, given that the LHS is a FunTy and that the RHS is a deep rho type (does not need any instantiation), we try to make the RHS into a FunTy, viz. β := (->) γ We can then continue using covariance & contravariance of the function arrow, which allows us to prove the subtyping relationship, instead of trying to unify which would cause us to error out with: Couldn't match expected type ‘β’ with actual type ‘(->) ((∀ a. a -> a) -> Int) See Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify. The other main improvement in this patch concerns type inference. The main subsumption logic happens (before & after this patch) in GHC.Tc.Gen.App.checkResultTy. However, before this patch, all of the DeepSubsumption logic only kicked in in 'check' mode, not in 'infer' mode. This patch adds deep instantiation in the 'infer' mode of checkResultTy when we are doing deep subsumption, which allows us to accept programs such as: f :: Int -> (forall a. a->a) g :: Int -> Bool -> Bool test1 b = case b of True -> f False -> g test2 b = case b of True -> g False -> f See Note [Deeply instantiate in checkResultTy when inferring]. Finally, we add representation-polymorphism checks to ensure that the lambda abstractions we introduce when doing subsumption obey the representation polymorphism invariants of Note [Representation polymorphism invariants] in GHC.Core. See Note [FunTy vs FunTy case in tc_sub_type_deep]. This is accompanied by a courtesy change to `(<.>) :: HsWrapper -> HsWrapper -> HsWrapper`, adding the equation: WpCast c1 <.> WpCast c2 = WpCast (c1 `mkTransCo` c2) This is useful because mkWpFun does not introduce an eta-expansion when both of the argument & result wrappers are casts; so this change allows us to avoid introducing lambda abstractions when casts suffice. Fixes #26225 - - - - - d175aff8 by Sylvain Henry at 2025-08-12T10:01:31-04:00 Add regression test for #18619 - - - - - a3983a26 by Sylvain Henry at 2025-08-12T10:02:20-04:00 RTS: remove some TSAN annotations (#20464) Use RELAXED_LOAD_ALWAYS macro instead. - - - - - 0434af81 by Ben Gamari at 2025-08-12T10:03:02-04:00 Bump time submodule to 1.15 Also required bumps of Cabal, directory, and hpc. - - - - - 62899117 by Florian Ragwitz at 2025-08-13T21:01:34-04:00 Extend record-selector usage ticking to all binds using a record field This extends the previous handling of ticking for RecordWildCards and NamedFieldPuns to all var bindings that involve record selectors. Note that certain patterns such as `Foo{foo = 42}` will currently not tick the `foo` selector, as ticking is triggered by `HsVar`s. Closes #26191. - - - - - b37b3af7 by Florian Ragwitz at 2025-08-13T21:01:34-04:00 Add release notes for 9.16.1 and move description of latest HPC changes there. - - - - - a5e4b7d9 by Ben Gamari at 2025-08-13T21:02:18-04:00 rts: Clarify rationale for undefined atomic wrappers Since c06e3f46d24ef69f3a3d794f5f604cb8c2a40cbc the RTS has declared various atomic operation wrappers defined by ghc-internal as undefined. While the rationale for this isn't clear from the commit message, I believe that this is necessary due to the unregisterised backend. Specifically, the code generator will reference these symbols when compiling RTS Cmm sources. - - - - - 50842f83 by Andreas Klebinger at 2025-08-13T21:03:01-04:00 Make unexpected LLVM versions a warning rather than an error. Typically a newer LLVM version *will* work so erroring out if a user uses a newer LLVM version is too aggressive. Fixes #25915 - - - - - c91e2650 by fendor at 2025-08-13T21:03:43-04:00 Store `StackTrace` and `StackSnapshot` in `Backtraces` Instead of decoding the stack traces when collecting the `Backtraces`, defer this decoding until actually showing the `Backtraces`. This allows users to customise how `Backtraces` are displayed by using a custom implementation of `displayExceptionWithInfo`, overwriting the default implementation for `Backtraces` (`displayBacktraces`). - - - - - dee28cdd by fendor at 2025-08-13T21:03:43-04:00 Allow users to customise the collection of exception annotations Add a global `CollectExceptionAnnotationMechanism` which determines how `ExceptionAnnotation`s are collected upon throwing an `Exception`. This API is exposed via `ghc-experimental`. By overriding how we collect `Backtraces`, we can control how the `Backtraces` are displayed to the user by newtyping `Backtraces` and giving a different instance for `ExceptionAnnotation`. A concrete use-case for this feature is allowing us to experiment with alternative stack decoders, without having to modify `base`, which take additional information from the stack frames. This commit does not modify how `Backtraces` are currently collected or displayed. - - - - - 66024722 by fendor at 2025-08-13T21:03:43-04:00 Expose Backtraces internals from ghc-experimental Additionally, expose the same API `base:Control.Exception.Backtrace` to make it easier to use as a drop-in replacement. - - - - - a766286f by Reed Mullanix at 2025-08-13T21:04:36-04:00 ghc-internal: Fix naturalAndNot for NB/NS case When the first argument to `naturalAndNot` is larger than a `Word` and the second is `Word`-sized, `naturalAndNot` will truncate the result: ``` >>> naturalAndNot ((2 ^ 65) .|. (2 ^ 3)) (2 ^ 3) 0 ``` In contrast, `naturalAndNot` does not truncate when both arguments are larger than a `Word`, so this appears to be a bug. Luckily, the fix is pretty easy: we just need to call `bigNatAndNotWord#` instead of truncating. Fixes #26230 - - - - - 3506fa7d by Simon Hengel at 2025-08-13T21:05:18-04:00 Report -pgms as a deprecated flag (instead of reporting an unspecific warning) Before: on the commandline: warning: Object splitting was removed in GHC 8.8 After: on the commandline: warning: [GHC-53692] [-Wdeprecated-flags] -pgms is deprecated: Object splitting was removed in GHC 8.8 - - - - - 51c701fe by Zubin Duggal at 2025-08-13T21:06:00-04:00 testsuite: Be more permissive when filtering out GNU_PROPERTY_TYPE linker warnings The warning text is slightly different with ld.bfd. Fixes #26249 - - - - - dfe6f464 by Simon Hengel at 2025-08-13T21:06:43-04:00 Refactoring: Don't misuse `MCDiagnostic` for lint messages `MCDiagnostic` is meant to be used for compiler diagnostics. Any code that creates `MCDiagnostic` directly, without going through `GHC.Driver.Errors.printMessage`, side steps `-fdiagnostics-as-json` (see e.g. !14475, !14492 !14548). To avoid this in the future I want to control more narrowly who creates `MCDiagnostic` (see #24113). Some parts of the compiler use `MCDiagnostic` purely for formatting purposes, without creating any real compiler diagnostics. This change introduces a helper function, `formatDiagnostic`, that can be used in such cases instead of constructing `MCDiagnostic`. - - - - - a8b2fbae by Teo Camarasu at 2025-08-13T21:07:24-04:00 rts: ensure MessageBlackHole.link is always a valid closure We turn a MessageBlackHole into an StgInd in wakeBlockingQueue(). Therefore it's important that the link field, which becomes the indirection field, always points to a valid closure. It's unclear whether it's currently possible for the previous behaviour to lead to a crash, but it's good to be consistent about this invariant nonetheless. Co-authored-by: Andreas Klebinger <klebinger.andreas(a)gmx.at> - - - - - 4021181e by Teo Camarasu at 2025-08-13T21:07:24-04:00 rts: spin if we see a WHITEHOLE in messageBlackHole When a BLACKHOLE gets cancelled in raiseAsync, we indirect to a THUNK. GC can then shortcut this, replacing our BLACKHOLE with a fresh THUNK. This THUNK is not guaranteed to have a valid indirectee field. If at the same time, a message intended for the previous BLACKHOLE is processed and concurrently we BLACKHOLE the THUNK, thus temporarily turning it into a WHITEHOLE, we can get a segfault, since we look at the undefined indirectee field of the THUNK The fix is simple: spin if we see a WHITEHOLE, and it will soon be replaced with a valid BLACKHOLE. Resolves #26205 - - - - - 1107af89 by Oleg Grenrus at 2025-08-13T21:08:06-04:00 Allow defining HasField instances for naughty fields Resolves #26295 ... as HasField solver doesn't solve for fields with "naughty" selectors, we could as well allow defining HasField instances for these fields. - - - - - 020e7587 by Sylvain Henry at 2025-08-13T21:09:00-04:00 Fix Data.List unqualified import warning - - - - - fd811ded by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Make injecting implicit bindings into its own pass Previously we were injecting "impliicit bindings" (data constructor worker and wrappers etc) - both at the end of CoreTidy, - and at the start of CorePrep This is unpleasant and confusing. This patch puts it it its own pass, addImplicitBinds, which runs between the two. The function `GHC.CoreToStg.AddImplicitBinds.addImplicitBinds` now takes /all/ TyCons, not just the ones for algebraic data types. That change ripples through to - corePrepPgm - doCodeGen - byteCodeGen All take [TyCon] which includes all TyCons - - - - - 9bd7fcc5 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Implement unary classes The big change is described exhaustively in Note [Unary class magic] in GHC.Core.TyCon Other changes * We never unbox class dictionaries in worker/wrapper. This has been true for some time now, but the logic is now centralised in functions in GHC.Core.Opt.WorkWrap.Utils, namely `canUnboxTyCon`, and `canUnboxArg` See Note [Do not unbox class dictionaries] in GHC.Core.Opt.WorkWrap.Utils. * Refactored the `notWorthFloating` logic in GHc.Core.Opt.SetLevels. I can't remember if I actually changed any behaviour here, but if so it's only in a corner cases. * Fixed a bug in `GHC.Core.TyCon.isEnumerationTyCon`, which was wrongly returning True for (##). * Remove redundant Role argument to `liftCoSubstWithEx`. It was always Representational. * I refactored evidence generation in the constraint solver: * Made GHC.Tc.Types.Evidence contain better abstactions for evidence generation. * I deleted the file `GHC.Tc.Types.EvTerm` and merged its (small) contents elsewhere. It wasn't paying its way. * Made evidence for implicit parameters go via a proper abstraction. * Fix inlineBoringOk; see (IB6) in Note [inlineBoringOk] This fixes a slowdown in `countdownEffectfulDynLocal` in the `effectful` library. Smaller things * Rename `isDataTyCon` to `isBoxedDataTyCon`. * GHC.Core.Corecion.liftCoSubstWithEx was only called with Representational role, so I baked that into the function and removed the argument. * Get rid of `GHC.Core.TyCon.tyConSingleAlgDataCon_maybe` in favour of calling `not isNewTyCon` at the call sites; more explicit. * Refatored `GHC.Core.TyCon.isInjectiveTyCon`; but I don't think I changed its behaviour * Moved `decomposeIPPred` to GHC.Core.Predicate Compile time performance changes: geo. mean +0.1% minimum -6.8% maximum +14.4% The +14% one is in T21839c, where it seems that a bit more inlining is taking place. That seems acceptable; and the average change is small Metric Decrease: LargeRecord T12227 T12707 T16577 T21839r T5642 Metric Increase: T15164 T21839c T3294 T5321FD T5321Fun WWRec - - - - - b4075d71 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Slight improvement to pre/postInlineUnconditionally Avoids an extra simplifier iteration - - - - - 9e443596 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Fix a long-standing assertion error in normSplitTyConApp_maybe - - - - - 91310ad0 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Add comment to coercion optimiser - - - - - 5b841d82 by Teo Camarasu at 2025-08-14T17:57:56-04:00 template-haskell: move some identifiers from ghc-internal to template-haskell These identifiers are not used internally by the compiler. Therefore we have no reason for them to be in ghc-internal. By moving them to template-haskell, we benefit from it being easier to change them and we avoid having to build them in stage0. Resolves #26048 - - - - - 33e2c7e5 by Teo Camarasu at 2025-08-14T17:57:56-04:00 template-haskell: transfer $infix note to public module This Haddock note should be in the public facing module - - - - - 2a411fc4 by Sylvain Henry at 2025-08-14T17:59:09-04:00 JS: export HEAP8 symbol (#26290) Newer Emscripten requires this. - - - - - 248f78ca by Ben Gamari at 2025-08-14T17:59:51-04:00 users-guide: Drop the THREAD_RUNNABLE event As of f361281c89fbce42865d8b8b27b0957205366186 it is no longer emitted. - - - - - 706d33e3 by Recursion Ninja at 2025-08-15T04:12:12-04:00 Resolving issues #20645 and #26109 Correctly sign extending and casting smaller bit width types for LLVM operations: - bitReverse8# - bitReverse16# - bitReverse32# - byteSwap16# - byteSwap32# - pdep8# - pdep16# - pext8# - pext16# - - - - - 1cdc6f46 by Cheng Shao at 2025-08-15T04:12:56-04:00 hadrian: enforce have_llvm=False for wasm32/js This patch fixes hadrian to always pass have_llvm=False to the testsuite driver for wasm32/js targets. These targets don't really support the LLVM backend, and the optllvm test way doesn't work. We used to special-case wasm32/js to avoid auto-adding optllvm way in testsuite/config/ghc, but this is still problematic if someone writes a new LLVM-related test and uses something like when(have_llvm(), extra_ways(["optllvm"])). So better just enforce have_llvm=False for these targets here. - - - - - ca03226d by Ben Gamari at 2025-08-18T13:43:20+00:00 configure: Allow use of LLVM 20 - - - - - 309 changed files: - .gitlab/darwin/toolchain.nix - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - CODEOWNERS - README.md - compiler/GHC/Builtin/Names.hs - compiler/GHC/Builtin/PrimOps/Ids.hs - compiler/GHC/Builtin/Types.hs - compiler/GHC/Builtin/Types/Prim.hs - compiler/GHC/Builtin/primops.txt.pp - compiler/GHC/ByteCode/InfoTable.hs - compiler/GHC/Cmm.hs - compiler/GHC/Cmm/CommonBlockElim.hs - compiler/GHC/CmmToAsm/LA64/CodeGen.hs - compiler/GHC/CmmToAsm/PPC/Ppr.hs - compiler/GHC/CmmToAsm/Ppr.hs - compiler/GHC/CmmToLlvm/CodeGen.hs - compiler/GHC/CmmToLlvm/Data.hs - compiler/GHC/Core/Class.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/Coercion/Opt.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/FamInstEnv.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/CprAnal.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Core/Opt/Simplify/Utils.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/Predicate.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Unfold.hs - compiler/GHC/Core/Unfold/Make.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/CoreToStg.hs - + compiler/GHC/CoreToStg/AddImplicitBinds.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Driver/Errors/Ppr.hs - compiler/GHC/Driver/Main.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/HsToCore.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Foreign/Call.hs - compiler/GHC/HsToCore/Ticks.hs - compiler/GHC/Iface/Decl.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Iface/Tidy.hs - compiler/GHC/IfaceToCore.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/Runtime/Debugger/Breakpoints.hs - compiler/GHC/Stg/Lint.hs - compiler/GHC/StgToByteCode.hs - compiler/GHC/StgToCmm.hs - compiler/GHC/StgToCmm/InfoTableProv.hs - compiler/GHC/StgToCmm/Prim.hs - compiler/GHC/StgToJS/Prim.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Gen/Bind.hs - compiler/GHC/Tc/Gen/Export.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Gen/HsType.hs - compiler/GHC/Tc/Instance/Class.hs - compiler/GHC/Tc/Instance/Family.hs - compiler/GHC/Tc/Solver/Default.hs - compiler/GHC/Tc/Solver/Dict.hs - compiler/GHC/Tc/Solver/Equality.hs - compiler/GHC/Tc/Solver/Monad.hs - compiler/GHC/Tc/Solver/Solve.hs - compiler/GHC/Tc/TyCl.hs - compiler/GHC/Tc/TyCl/Build.hs - compiler/GHC/Tc/TyCl/Instance.hs - compiler/GHC/Tc/TyCl/PatSyn.hs - compiler/GHC/Tc/TyCl/Utils.hs - − compiler/GHC/Tc/Types/EvTerm.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Types/Origin.hs - compiler/GHC/Tc/Utils/Concrete.hs - compiler/GHC/Tc/Utils/TcMType.hs - compiler/GHC/Tc/Utils/Unify.hs - compiler/GHC/Tc/Validity.hs - 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+ testsuite/tests/splice-imports/ModuleExport.hs - + testsuite/tests/splice-imports/ModuleExport.stderr - + testsuite/tests/splice-imports/ModuleExportA.hs - + testsuite/tests/splice-imports/ModuleExportB.hs - + testsuite/tests/splice-imports/T26090.hs - + testsuite/tests/splice-imports/T26090.stderr - + testsuite/tests/splice-imports/T26090A.hs - testsuite/tests/splice-imports/all.T - testsuite/tests/tcplugins/CtIdPlugin.hs - testsuite/tests/th/Makefile - testsuite/tests/type-data/should_run/T22332a.stderr - testsuite/tests/typecheck/should_compile/Makefile - testsuite/tests/typecheck/should_compile/T12763.stderr - testsuite/tests/typecheck/should_compile/T14774.stdout - testsuite/tests/typecheck/should_compile/T18406b.stderr - testsuite/tests/typecheck/should_compile/T18529.stderr - + testsuite/tests/typecheck/should_compile/T26225.hs - + testsuite/tests/typecheck/should_compile/T26225b.hs - + testsuite/tests/typecheck/should_compile/T26256a.hs - testsuite/tests/typecheck/should_compile/all.T - − testsuite/tests/typecheck/should_fail/T12563.stderr - testsuite/tests/typecheck/should_fail/T14618.stderr - testsuite/tests/typecheck/should_fail/T6022.stderr - testsuite/tests/typecheck/should_fail/T8883.stderr - testsuite/tests/typecheck/should_fail/all.T - testsuite/tests/typecheck/should_fail/tcfail140.stderr - testsuite/tests/typecheck/should_run/T10284.stderr - testsuite/tests/typecheck/should_run/T13838.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 - testsuite/tests/unboxedsums/unpack_sums_7.stdout - testsuite/tests/unsatisfiable/T23816.stderr - testsuite/tests/unsatisfiable/UnsatDefer.stderr - testsuite/tests/wasm/should_run/control-flow/LoadCmmGroup.hs - testsuite/tests/wasm/should_run/control-flow/RunWasm.hs - utils/genprimopcode/Lexer.x - utils/genprimopcode/Main.hs - utils/genprimopcode/Parser.y - utils/genprimopcode/ParserM.hs - utils/genprimopcode/Syntax.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/d0e41ca0ce23aaadcd566a7319ea35… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/d0e41ca0ce23aaadcd566a7319ea35… You're receiving this email because of your account on gitlab.haskell.org.

1 0

[Git][ghc/ghc][wip/gdc-files] fixes
by Matthew Pickering (＠mpickering) 18 Aug '25

18 Aug '25

Matthew Pickering pushed to branch wip/gdc-files at Glasgow Haskell Compiler / GHC Commits: 64a09647 by Matthew Pickering at 2025-08-18T14:35:00+01:00 fixes - - - - - 12 changed files: - compiler/GHC/Driver/Main.hs - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Unit/Module/Status.hs - testsuite/driver/testlib.py - testsuite/tests/driver/T5313.hs - testsuite/tests/ghc-api/T10052/T10052.hs - testsuite/tests/ghc-api/T8639_api.hs - testsuite/tests/ghc-api/apirecomp001/myghc.hs - testsuite/tests/ghci/linking/dyn/T3372.hs - testsuite/tests/ghci/should_run/PackedDataCon/packeddatacon.T - testsuite/tests/ghci/should_run/UnboxedTuples/unboxedtuples.T - testsuite/tests/ghci/should_run/UnliftedDataTypeInterp/unlifteddatatypeinterp.T Changes: ===================================== compiler/GHC/Driver/Main.hs ===================================== @@ -849,15 +849,14 @@ hscRecompStatus return $ HscRecompNeeded $ fmap mi_iface_hash mb_checked_iface UpToDateItem checked_iface -> do let lcl_dflags = ms_hspp_opts mod_summary - mod_details <- initModDetails hsc_env checked_iface if | not (backendGeneratesCode (backend lcl_dflags)) -> do -- No need for a linkable, we're good to go msg UpToDate - return $ HscUpToDate (HomeModInfo checked_iface mod_details emptyHomeModInfoLinkable) + return $ HscUpToDate checked_iface emptyHomeModInfoLinkable | not (backendGeneratesCodeForHsBoot (backend lcl_dflags)) , IsBoot <- isBootSummary mod_summary -> do msg UpToDate - return $ HscUpToDate (HomeModInfo checked_iface mod_details emptyHomeModInfoLinkable) + return $ HscUpToDate checked_iface emptyHomeModInfoLinkable -- Always recompile with the JS backend when TH is enabled until -- #23013 is fixed. @@ -874,7 +873,7 @@ hscRecompStatus -- 2. The bytecode object file bc_obj_linkable <- checkByteCodeFromObject hsc_env mod_summary -- 3. Bytecode from an interface whole core bindings. - bc_core_linkable <- checkByteCodeFromCoreBindings hsc_env checked_iface mod_details mod_summary + bc_core_linkable <- checkByteCodeFromCoreBindings hsc_env checked_iface mod_summary -- 4. The object file. obj_linkable <- liftIO $ checkObjects lcl_dflags (homeMod_object old_linkable) mod_summary trace_if (hsc_logger hsc_env) @@ -885,7 +884,7 @@ hscRecompStatus let just_o = justObjects <$> obj_linkable - definitely_both_os = case (definitely_bc, obj_linkable) of + definitely_both_os = case (bc_result, obj_linkable) of (UpToDateItem bc, UpToDateItem o) -> UpToDateItem (bytecodeAndObjects bc o) -- If missing object code, just say we need to recompile because of object code. (_, OutOfDateItem reason _) -> OutOfDateItem reason Nothing @@ -898,17 +897,26 @@ hscRecompStatus definitely_bc = bc_obj_linkable `prefer` bc_in_memory_linkable -- If not -fwrite-byte-code, then we could use core bindings or object code if that's available. - maybe_bc = ((bc_obj_linkable `choose` bc_core_linkable) `prefer` bc_in_memory_linkable) - `choose` obj_linkable + maybe_bc = bc_in_memory_linkable `choose` + bc_obj_linkable `choose` + bc_core_linkable `choose` + obj_linkable + bc_result = if gopt Opt_WriteByteCode lcl_dflags + -- If the byte-code artifact needs to be produced, then we certainly need bytecode. + then definitely_bc + else maybe_bc + + trace_if (hsc_logger hsc_env) + (vcat [text "definitely_bc", ppr definitely_bc + , text "maybe_bc", ppr maybe_bc + , text "definitely_both_os", ppr definitely_both_os + , text "just_o", ppr just_o]) -- pprTraceM "recomp" (ppr just_bc <+> ppr just_o) -- 2. Decide which of the products we will need let recomp_linkable_result = case () of _ | backendCanReuseLoadedCode (backend lcl_dflags) -> - if gopt Opt_WriteByteCode lcl_dflags - -- If the byte-code artifact needs to be produced, then we certainly need bytecode. - then justBytecode <$> definitely_bc - else justBytecode <$> maybe_bc + justBytecode <$> bc_result -- Need object files for making object files | backendWritesFiles (backend lcl_dflags) -> if gopt Opt_ByteCodeAndObjectCode lcl_dflags @@ -921,7 +929,7 @@ hscRecompStatus case recomp_linkable_result of UpToDateItem linkable -> do msg $ UpToDate - return $ HscUpToDate (HomeModInfo checked_iface mod_details linkable) + return $ HscUpToDate checked_iface linkable OutOfDateItem reason _ -> do msg $ NeedsRecompile reason return $ HscRecompNeeded $ Just $ mi_iface_hash $ checked_iface @@ -1010,19 +1018,20 @@ checkByteCodeFromObject hsc_env mod_sum = do -- | Attempt to load bytecode from whole core bindings in the interface if they exist. -- This is a legacy code-path, these days it should be preferred to use the bytecode object linkable. -checkByteCodeFromCoreBindings :: HscEnv -> ModIface -> ModDetails -> ModSummary -> IO (MaybeValidated Linkable) -checkByteCodeFromCoreBindings hsc_env iface mod_details mod_sum = do +checkByteCodeFromCoreBindings :: HscEnv -> ModIface -> ModSummary -> IO (MaybeValidated Linkable) +checkByteCodeFromCoreBindings _hsc_env iface mod_sum = do let this_mod = ms_mod mod_sum if_date = fromJust $ ms_iface_date mod_sum case iface_core_bindings iface (ms_location mod_sum) of Just fi -> do - ~(bco, fos) <- unsafeInterleaveIO $ - compileWholeCoreBindings hsc_env (md_types mod_details) fi - let bco' = LazyBCOs bco fos - return $ UpToDateItem (Linkable if_date this_mod (NE.singleton bco')) + return $ UpToDateItem (Linkable if_date this_mod (NE.singleton (CoreBindings fi))) _ -> return $ outOfDateItemBecause MissingBytecode Nothing +-- 970 let fi = WholeCoreBindings extra_decls this_mod (ms_location mod_sum) +-- 971 (mi_foreign iface) +-- 972 return (UpToDateItem (Linkable if_date this_mod (NE.singleton (CoreBindings fi)))) + -------------------------------------------------------------- -- Compilers -------------------------------------------------------------- ===================================== compiler/GHC/Driver/Pipeline.hs ===================================== @@ -244,11 +244,11 @@ compileOne' mHscMessage status <- hscRecompStatus mHscMessage plugin_hsc_env upd_summary mb_old_iface mb_old_linkable (mod_index, nmods) let pipeline = hscPipeline pipe_env (setDumpPrefix pipe_env plugin_hsc_env, upd_summary, status) - runPipeline (hsc_hooks plugin_hsc_env) pipeline + (iface, linkable) <- runPipeline (hsc_hooks plugin_hsc_env) pipeline -- See Note [ModDetails and --make mode] - -- details <- initModDetails plugin_hsc_env iface - -- linkable' <- traverse (initWholeCoreBindings plugin_hsc_env iface details) (homeMod_bytecode linkable) - -- return $! HomeModInfo iface details (linkable { homeMod_bytecode = linkable' }) + details <- initModDetails plugin_hsc_env iface + linkable' <- traverse (initWholeCoreBindings plugin_hsc_env iface details) (homeMod_bytecode linkable) + return $! HomeModInfo iface details (linkable { homeMod_bytecode = linkable' }) where lcl_dflags = ms_hspp_opts summary location = ms_location summary @@ -757,7 +757,7 @@ preprocessPipeline pipe_env hsc_env input_fn = do $ phaseIfFlag hsc_env flag def action -- | The complete compilation pipeline, from start to finish -fullPipeline :: P m => PipeEnv -> HscEnv -> FilePath -> HscSource -> m HomeModInfo +fullPipeline :: P m => PipeEnv -> HscEnv -> FilePath -> HscSource -> m (ModIface, HomeModLinkable) fullPipeline pipe_env hsc_env pp_fn src_flavour = do (dflags, input_fn) <- preprocessPipeline pipe_env hsc_env pp_fn let hsc_env' = hscSetFlags dflags hsc_env @@ -766,16 +766,15 @@ fullPipeline pipe_env hsc_env pp_fn src_flavour = do hscPipeline pipe_env (hsc_env_with_plugins, mod_sum, hsc_recomp_status) -- | Everything after preprocess -hscPipeline :: P m => PipeEnv -> ((HscEnv, ModSummary, HscRecompStatus)) -> m HomeModInfo +hscPipeline :: P m => PipeEnv -> ((HscEnv, ModSummary, HscRecompStatus)) -> m (ModIface, HomeModLinkable) hscPipeline pipe_env (hsc_env_with_plugins, mod_sum, hsc_recomp_status) = do case hsc_recomp_status of - HscUpToDate hmi -> return hmi + HscUpToDate iface linkable -> return (iface, linkable) HscRecompNeeded mb_old_hash -> do (tc_result, warnings) <- use (T_Hsc hsc_env_with_plugins mod_sum) hscBackendAction <- use (T_HscPostTc hsc_env_with_plugins mod_sum tc_result warnings mb_old_hash ) (iface, linkable) <-hscBackendPipeline pipe_env hsc_env_with_plugins mod_sum hscBackendAction - details <- liftIO $ initModDetails hsc_env_with_plugins iface - return $! HomeModInfo iface details linkable + return $! (iface, linkable) hscBackendPipeline :: P m => PipeEnv -> HscEnv -> ModSummary -> HscBackendAction -> m (ModIface, HomeModLinkable) hscBackendPipeline pipe_env hsc_env mod_sum result = @@ -924,7 +923,7 @@ pipelineStart pipe_env hsc_env input_fn mb_phase = liftIO (showPass logger msg) liftIO (copyWithHeader line_prag out_fn final_fn) return Nothing - _ -> objFromLinkable . hm_linkable <$> fullPipeline pipe_env hsc_env input_fn sf + _ -> objFromLinkable . snd <$> fullPipeline pipe_env hsc_env input_fn sf c :: P m => Phase -> m (Maybe FilePath) c phase = viaCPipeline phase pipe_env hsc_env Nothing input_fn as :: P m => Bool -> m (Maybe FilePath) ===================================== compiler/GHC/Unit/Module/Status.hs ===================================== @@ -16,7 +16,7 @@ import GHC.Unit.Home.ModInfo -- | Status of a module in incremental compilation data HscRecompStatus -- | Nothing to do because code already exists. - = HscUpToDate HomeModInfo + = HscUpToDate ModIface HomeModLinkable -- | Recompilation of module, or update of interface is required. Optionally -- pass the old interface hash to avoid updating the existing interface when -- it has not changed. ===================================== testsuite/driver/testlib.py ===================================== @@ -549,10 +549,12 @@ only_ghci = only_ways([WayName('ghci'), WayName('ghci-opt')]) # ----- def valid_way( way: WayName ) -> bool: - if way in {'ghci', 'ghci-opt', 'ghci-ext'}: + if way in {'ghci', 'ghci-opt'}: return config.have_RTS_linker - if way == 'ghci-ext-prof': - return config.have_RTS_linker and config.have_profiling + if way in {'ghci-ext'}: + return config.have_ext_interp + if way in {'ghci-ext-prof'}: + return config.have_ext_interp and config.have_profiling return True def extra_ways( ways: List[WayName] ): ===================================== testsuite/tests/driver/T5313.hs ===================================== @@ -7,7 +7,7 @@ main = do -- begin initialize df0 <- GHC.getSessionDynFlags let df1 = df0{GHC.ghcMode = GHC.CompManager, - GHC.backend = GHC.interpreterBackend, + GHC.backend = GHC.bytecodeBackend, GHC.ghcLink = GHC.LinkInMemory, GHC.verbosity = 0} _ <- GHC.setSessionDynFlags df1 ===================================== testsuite/tests/ghc-api/T10052/T10052.hs ===================================== @@ -24,7 +24,7 @@ runGhc' args act = do logger <- getLogger (dflags1, _leftover, _warns) <- parseDynamicFlags logger dflags0 flags let dflags2 = dflags1 { - backend = interpreterBackend + backend = bytecodeBackend , ghcLink = LinkInMemory , verbosity = 1 } ===================================== testsuite/tests/ghc-api/T8639_api.hs ===================================== @@ -11,7 +11,7 @@ main = do { [libdir] <- getArgs ; runGhc (Just libdir) $ do flags <- getSessionDynFlags - setSessionDynFlags (flags{ backend = interpreterBackend, ghcLink = LinkInMemory}) + setSessionDynFlags (flags{ backend = bytecodeBackend, ghcLink = LinkInMemory}) target <- guessTarget "T8639_api_a.hs" Nothing Nothing setTargets [target] load LoadAllTargets ===================================== testsuite/tests/ghc-api/apirecomp001/myghc.hs ===================================== @@ -37,7 +37,7 @@ main = do prn "target nothing: ok" dflags <- getSessionDynFlags - setSessionDynFlags $ dflags { backend = interpreterBackend } + setSessionDynFlags $ dflags { backend = bytecodeBackend } ok <- load LoadAllTargets when (failed ok) $ error "Couldn't load A.hs in interpreted mode" prn "target interpreted: ok" ===================================== testsuite/tests/ghci/linking/dyn/T3372.hs ===================================== @@ -44,7 +44,7 @@ newGhcServer = do (libdir:_) <- getArgs where ghc action libdir = GHC.runGhc (Just libdir) (init >> action) init = do df <- GHC.getSessionDynFlags GHC.setSessionDynFlags df{GHC.ghcMode = GHC.CompManager, - GHC.backend = GHC.interpreterBackend, + GHC.backend = GHC.bytecodeBackend, GHC.ghcLink = GHC.LinkInMemory, GHC.verbosity = 0} ===================================== testsuite/tests/ghci/should_run/PackedDataCon/packeddatacon.T ===================================== @@ -2,9 +2,8 @@ test('PackedDataCon', [ extra_files(['Obj.hs', 'ByteCode.hs', 'Types.hs', 'Common.hs-incl']), req_interp, req_bco, - extra_ways(['ghci']), - when(config.have_ext_interp, extra_ways(['ghci', 'ghci-ext'])), - when(config.have_ext_interp and config.have_profiling, extra_ways(['ghci', 'ghci-ext', 'ghci-ext-prof'])) + extra_ways(ghci_ways), + only_ways(ghci_ways), ], compile_and_run, [''] ===================================== testsuite/tests/ghci/should_run/UnboxedTuples/unboxedtuples.T ===================================== @@ -1,10 +1,11 @@ +print(ghci_ways) + test('UnboxedTuples', [ extra_files(['Obj.hs', 'ByteCode.hs', 'Common.hs-incl']), req_interp, req_bco, - extra_ways(['ghci']), - when(config.have_ext_interp, extra_ways(['ghci', 'ghci-ext'])), - when(config.have_ext_interp and config.have_profiling, extra_ways(['ghci', 'ghci-ext', 'ghci-ext-prof'])) + only_ways(ghci_ways), + extra_ways(ghci_ways), ], compile_and_run, [''] ===================================== testsuite/tests/ghci/should_run/UnliftedDataTypeInterp/unlifteddatatypeinterp.T ===================================== @@ -2,9 +2,8 @@ test('UnliftedDataTypeInterp', [ extra_files(['Obj.hs', 'ByteCode.hs', 'Types.hs', 'Common.hs-incl']), req_interp, req_bco, - extra_ways(['ghci']), - when(config.have_ext_interp, extra_ways(['ghci', 'ghci-ext'])), - when(config.have_ext_interp and config.have_profiling, extra_ways(['ghci', 'ghci-ext', 'ghci-ext-prof'])) + only_ways(ghci_ways), + extra_ways(ghci_ways), ], compile_and_run, [''] View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/64a0964734a4572c63aa49eb1d026cf… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/64a0964734a4572c63aa49eb1d026cf… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/T26217] 3 commits: ghc-internal: Split out GHC.Internal.TH.Monad from .Syntax
by Teo Camarasu (＠teo) 18 Aug '25

18 Aug '25

Teo Camarasu pushed to branch wip/T26217 at Glasgow Haskell Compiler / GHC Commits: aa284115 by Teo Camarasu at 2025-08-18T14:00:11+01:00 ghc-internal: Split out GHC.Internal.TH.Monad from .Syntax Split the Quasi/Q, etc definition out of GHC.Internal.TH.Syntax into its own module. We do this for a few reasons: - it enables future refactors to speed up compilation of these modules. - it reduces the size of this very large module. - it clarifies which modules in the GHC tree depend on the TH monads (Q/Quasi, etc) and which just care about the syntax tree. A step towards addressing: #26217 - - - - - a5e5f1a9 by Teo Camarasu at 2025-08-18T14:00:11+01:00 ghc-internal: Move Data instance for TH.Syntax to Data.Data This means that Data.Data no longer blocks building TH.Syntax, which allows greater parallelism in our builds. Previously TH.Syntax was a bottleneck when compiling ghc-internal. Now it is less of a bottle-neck and is also slightly quicker to compile (since it no longer contains these instances) at the cost of making Data.Data slightly more expensive to compile. TH.Lift which depends on TH.Syntax can also compile quicker and no longer blocks ghc-internal finishing to compile. Resolves #26217 - - - - - 59db903a by Teo Camarasu at 2025-08-18T14:00:11+01:00 compiler: delete unused names in Builtins.Names.TH returnQ and bindQ are no longer used in the compiler. There was also a very old comment that referred to them that I have modernized - - - - - 1169 changed files: - compiler/GHC/Builtin/Names/TH.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/Rename/Splice.hs - compiler/GHC/Tc/Gen/Splice.hs - compiler/GHC/Tc/Gen/Splice.hs-boot - compiler/GHC/Tc/Types/TH.hs - libraries/base/src/Data/Array/Byte.hs - libraries/base/src/Data/Fixed.hs - + libraries/ghc-boot-th/GHC/Boot/TH/Monad.hs - libraries/ghc-boot-th/ghc-boot-th.cabal.in - libraries/ghc-internal/ghc-internal.cabal.in - libraries/ghc-internal/src/GHC/Internal/Data/Data.hs - libraries/ghc-internal/src/GHC/Internal/TH/Lib.hs - libraries/ghc-internal/src/GHC/Internal/TH/Lift.hs - + libraries/ghc-internal/src/GHC/Internal/TH/Monad.hs - libraries/ghc-internal/src/GHC/Internal/TH/Quote.hs - libraries/ghc-internal/src/GHC/Internal/TH/Syntax.hs - libraries/ghci/GHCi/Message.hs - libraries/ghci/GHCi/TH.hs - libraries/template-haskell/Language/Haskell/TH/Quote.hs - libraries/template-haskell/Language/Haskell/TH/Syntax.hs - 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testsuite/tests/safeHaskell/safeLanguage/SafeLang12.stderr - testsuite/tests/safeHaskell/safeLanguage/SafeLang17.stderr - testsuite/tests/safeHaskell/unsafeLibs/BadImport01.stderr - testsuite/tests/safeHaskell/unsafeLibs/BadImport06.stderr - testsuite/tests/safeHaskell/unsafeLibs/BadImport07.stderr - testsuite/tests/safeHaskell/unsafeLibs/BadImport08.stderr - testsuite/tests/safeHaskell/unsafeLibs/BadImport09.stderr - testsuite/tests/safeHaskell/unsafeLibs/Dep05.stderr - testsuite/tests/safeHaskell/unsafeLibs/Dep06.stderr - testsuite/tests/safeHaskell/unsafeLibs/Dep07.stderr - testsuite/tests/safeHaskell/unsafeLibs/Dep08.stderr - testsuite/tests/safeHaskell/unsafeLibs/Dep09.stderr - testsuite/tests/safeHaskell/unsafeLibs/Dep10.stderr - testsuite/tests/saks/should_fail/T16725.stderr - testsuite/tests/saks/should_fail/T16727a.stderr - testsuite/tests/saks/should_fail/T16727b.stderr - testsuite/tests/saks/should_fail/T16756b.stderr - testsuite/tests/saks/should_fail/T16826.stderr - testsuite/tests/saks/should_fail/T18863a.stderr - testsuite/tests/saks/should_fail/saks007_fail.stderr - testsuite/tests/saks/should_fail/saks_fail001.stderr - testsuite/tests/saks/should_fail/saks_fail002.stderr - testsuite/tests/saks/should_fail/saks_fail004.stderr - testsuite/tests/saks/should_fail/saks_fail005.stderr - testsuite/tests/saks/should_fail/saks_fail006.stderr - testsuite/tests/saks/should_fail/saks_fail008.stderr - testsuite/tests/saks/should_fail/saks_fail009.stderr - testsuite/tests/saks/should_fail/saks_fail010.stderr - testsuite/tests/saks/should_fail/saks_fail011.stderr - testsuite/tests/saks/should_fail/saks_fail012.stderr - testsuite/tests/saks/should_fail/saks_fail013.stderr - testsuite/tests/saks/should_fail/saks_fail014.stderr - testsuite/tests/saks/should_fail/saks_fail015.stderr - testsuite/tests/saks/should_fail/saks_fail016.stderr - testsuite/tests/saks/should_fail/saks_fail017.stderr - testsuite/tests/saks/should_fail/saks_fail018.stderr - testsuite/tests/saks/should_fail/saks_fail019.stderr - testsuite/tests/saks/should_fail/saks_fail020.stderr - testsuite/tests/saks/should_fail/saks_fail021.stderr - testsuite/tests/saks/should_fail/saks_fail022.stderr - testsuite/tests/saks/should_fail/saks_fail023.stderr - testsuite/tests/saks/should_fail/saks_fail026.stderr - testsuite/tests/splice-imports/SI29.stderr - testsuite/tests/th/T11452.stderr - testsuite/tests/th/T15321.stderr - testsuite/tests/th/T7276.stderr - testsuite/tests/th/TH_NestedSplicesFail3.stderr - testsuite/tests/th/TH_NestedSplicesFail4.stderr The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/165859aad9e5a1dcd1fd7a40f0a047… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/165859aad9e5a1dcd1fd7a40f0a047… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/haanss/depdir] replace spaces with tabs in makefile tests for dependentDir, because for some...
by Hassan Al-Awwadi (＠hassan.awwadi) 18 Aug '25

18 Aug '25

Hassan Al-Awwadi pushed to branch wip/haanss/depdir at Glasgow Haskell Compiler / GHC Commits: 370faa27 by Hassan Al-Awwadi at 2025-08-18T14:21:12+02:00 replace spaces with tabs in makefile tests for dependentDir, because for some reason we use tabs here... - - - - - 1 changed file: - testsuite/tests/th/Makefile Changes: ===================================== testsuite/tests/th/Makefile ===================================== @@ -55,25 +55,25 @@ TH_Depends_Dir: mkdir DONT_TRIGGER_RECOMP # First build with an empty dependent directory - '$(TEST_HC)' $(TEST_HC_OPTS) $(ghcThWayFlags) --make -package template-haskell -v0 TH_Depends_Dir + '$(TEST_HC)' $(TEST_HC_OPTS) $(ghcThWayFlags) --make -package template-haskell -v0 TH_Depends_Dir ./TH_Depends_Dir # Create a file in the dependent directory to trigger recompilation sleep 2 echo "dummy" > TRIGGER_RECOMP/dummy.txt - '$(TEST_HC)' $(TEST_HC_OPTS) $(ghcThWayFlags) --make -package template-haskell -v0 TH_Depends_Dir + '$(TEST_HC)' $(TEST_HC_OPTS) $(ghcThWayFlags) --make -package template-haskell -v0 TH_Depends_Dir ./TH_Depends_Dir # Remove the file to check that recompilation is triggered sleep 2 $(RM) TRIGGER_RECOMP/dummy.txt - '$(TEST_HC)' $(TEST_HC_OPTS) $(ghcThWayFlags) --make -package template-haskell -v0 TH_Depends_Dir + '$(TEST_HC)' $(TEST_HC_OPTS) $(ghcThWayFlags) --make -package template-haskell -v0 TH_Depends_Dir ./TH_Depends_Dir # Should not trigger recompilation sleep 2 echo "dummy" > DONT_TRIGGER_RECOMP/dummy.txt - '$(TEST_HC)' $(TEST_HC_OPTS) $(ghcThWayFlags) --make -package template-haskell -v0 TH_Depends_Dir + '$(TEST_HC)' $(TEST_HC_OPTS) $(ghcThWayFlags) --make -package template-haskell -v0 TH_Depends_Dir ./TH_Depends_Dir # Should trigger a recompilation. Note that we should also see the change @@ -81,7 +81,7 @@ TH_Depends_Dir: # as we recompile, it just doesn't *trigger* a recompilation. sleep 2 rm -rf TRIGGER_RECOMP - '$(TEST_HC)' $(TEST_HC_OPTS) $(ghcThWayFlags) --make -package template-haskell -v0 TH_Depends_Dir + '$(TEST_HC)' $(TEST_HC_OPTS) $(ghcThWayFlags) --make -package template-haskell -v0 TH_Depends_Dir ./TH_Depends_Dir T8333: View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/370faa27c95e90d74d7e1ca2b6cad2e… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/370faa27c95e90d74d7e1ca2b6cad2e… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/batch-loaddll] 12 commits: Make injecting implicit bindings into its own pass
by Cheng Shao (＠TerrorJack) 18 Aug '25

18 Aug '25

Cheng Shao pushed to branch wip/batch-loaddll at Glasgow Haskell Compiler / GHC Commits: fd811ded by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Make injecting implicit bindings into its own pass Previously we were injecting "impliicit bindings" (data constructor worker and wrappers etc) - both at the end of CoreTidy, - and at the start of CorePrep This is unpleasant and confusing. This patch puts it it its own pass, addImplicitBinds, which runs between the two. The function `GHC.CoreToStg.AddImplicitBinds.addImplicitBinds` now takes /all/ TyCons, not just the ones for algebraic data types. That change ripples through to - corePrepPgm - doCodeGen - byteCodeGen All take [TyCon] which includes all TyCons - - - - - 9bd7fcc5 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Implement unary classes The big change is described exhaustively in Note [Unary class magic] in GHC.Core.TyCon Other changes * We never unbox class dictionaries in worker/wrapper. This has been true for some time now, but the logic is now centralised in functions in GHC.Core.Opt.WorkWrap.Utils, namely `canUnboxTyCon`, and `canUnboxArg` See Note [Do not unbox class dictionaries] in GHC.Core.Opt.WorkWrap.Utils. * Refactored the `notWorthFloating` logic in GHc.Core.Opt.SetLevels. I can't remember if I actually changed any behaviour here, but if so it's only in a corner cases. * Fixed a bug in `GHC.Core.TyCon.isEnumerationTyCon`, which was wrongly returning True for (##). * Remove redundant Role argument to `liftCoSubstWithEx`. It was always Representational. * I refactored evidence generation in the constraint solver: * Made GHC.Tc.Types.Evidence contain better abstactions for evidence generation. * I deleted the file `GHC.Tc.Types.EvTerm` and merged its (small) contents elsewhere. It wasn't paying its way. * Made evidence for implicit parameters go via a proper abstraction. * Fix inlineBoringOk; see (IB6) in Note [inlineBoringOk] This fixes a slowdown in `countdownEffectfulDynLocal` in the `effectful` library. Smaller things * Rename `isDataTyCon` to `isBoxedDataTyCon`. * GHC.Core.Corecion.liftCoSubstWithEx was only called with Representational role, so I baked that into the function and removed the argument. * Get rid of `GHC.Core.TyCon.tyConSingleAlgDataCon_maybe` in favour of calling `not isNewTyCon` at the call sites; more explicit. * Refatored `GHC.Core.TyCon.isInjectiveTyCon`; but I don't think I changed its behaviour * Moved `decomposeIPPred` to GHC.Core.Predicate Compile time performance changes: geo. mean +0.1% minimum -6.8% maximum +14.4% The +14% one is in T21839c, where it seems that a bit more inlining is taking place. That seems acceptable; and the average change is small Metric Decrease: LargeRecord T12227 T12707 T16577 T21839r T5642 Metric Increase: T15164 T21839c T3294 T5321FD T5321Fun WWRec - - - - - b4075d71 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Slight improvement to pre/postInlineUnconditionally Avoids an extra simplifier iteration - - - - - 9e443596 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Fix a long-standing assertion error in normSplitTyConApp_maybe - - - - - 91310ad0 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Add comment to coercion optimiser - - - - - 5b841d82 by Teo Camarasu at 2025-08-14T17:57:56-04:00 template-haskell: move some identifiers from ghc-internal to template-haskell These identifiers are not used internally by the compiler. Therefore we have no reason for them to be in ghc-internal. By moving them to template-haskell, we benefit from it being easier to change them and we avoid having to build them in stage0. Resolves #26048 - - - - - 33e2c7e5 by Teo Camarasu at 2025-08-14T17:57:56-04:00 template-haskell: transfer $infix note to public module This Haddock note should be in the public facing module - - - - - 2a411fc4 by Sylvain Henry at 2025-08-14T17:59:09-04:00 JS: export HEAP8 symbol (#26290) Newer Emscripten requires this. - - - - - 248f78ca by Ben Gamari at 2025-08-14T17:59:51-04:00 users-guide: Drop the THREAD_RUNNABLE event As of f361281c89fbce42865d8b8b27b0957205366186 it is no longer emitted. - - - - - 706d33e3 by Recursion Ninja at 2025-08-15T04:12:12-04:00 Resolving issues #20645 and #26109 Correctly sign extending and casting smaller bit width types for LLVM operations: - bitReverse8# - bitReverse16# - bitReverse32# - byteSwap16# - byteSwap32# - pdep8# - pdep16# - pext8# - pext16# - - - - - 1cdc6f46 by Cheng Shao at 2025-08-15T04:12:56-04:00 hadrian: enforce have_llvm=False for wasm32/js This patch fixes hadrian to always pass have_llvm=False to the testsuite driver for wasm32/js targets. These targets don't really support the LLVM backend, and the optllvm test way doesn't work. We used to special-case wasm32/js to avoid auto-adding optllvm way in testsuite/config/ghc, but this is still problematic if someone writes a new LLVM-related test and uses something like when(have_llvm(), extra_ways(["optllvm"])). So better just enforce have_llvm=False for these targets here. - - - - - b10ad5a5 by Cheng Shao at 2025-08-18T14:17:47+02:00 ghci: LoadDLL -> LoadDLLs Closes #25407. Co-authored-by: Codex <codex(a)openai.com> - - - - - 130 changed files: - compiler/GHC/Builtin/Types.hs - compiler/GHC/Builtin/primops.txt.pp - compiler/GHC/ByteCode/InfoTable.hs - compiler/GHC/CmmToLlvm/CodeGen.hs - compiler/GHC/Core/Class.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/Coercion/Opt.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/FamInstEnv.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/CprAnal.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Core/Opt/Simplify/Utils.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/Predicate.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Unfold.hs - compiler/GHC/Core/Unfold/Make.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/CoreToStg.hs - + compiler/GHC/CoreToStg/AddImplicitBinds.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Driver/Main.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Foreign/Call.hs - compiler/GHC/Iface/Decl.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Iface/Tidy.hs - compiler/GHC/IfaceToCore.hs - compiler/GHC/Linker/Loader.hs - compiler/GHC/Linker/MacOS.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/Runtime/Interpreter.hs - compiler/GHC/StgToByteCode.hs - compiler/GHC/StgToCmm.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Gen/Bind.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Instance/Class.hs - compiler/GHC/Tc/Instance/Family.hs - compiler/GHC/Tc/Solver/Default.hs - compiler/GHC/Tc/Solver/Dict.hs - compiler/GHC/Tc/Solver/Equality.hs - compiler/GHC/Tc/Solver/Monad.hs - compiler/GHC/Tc/Solver/Solve.hs - compiler/GHC/Tc/TyCl.hs - compiler/GHC/Tc/TyCl/Build.hs - compiler/GHC/Tc/TyCl/Instance.hs - compiler/GHC/Tc/TyCl/PatSyn.hs - compiler/GHC/Tc/TyCl/Utils.hs - − compiler/GHC/Tc/Types/EvTerm.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Utils/TcMType.hs - compiler/GHC/Types/Demand.hs - compiler/GHC/Types/Id.hs - compiler/GHC/Types/Id/Make.hs - compiler/GHC/Types/RepType.hs - compiler/GHC/Types/TyThing.hs - compiler/ghc.cabal.in - docs/users_guide/eventlog-formats.rst - hadrian/src/Settings/Builders/RunTest.hs - libraries/ghc-internal/cbits/pdep.c - libraries/ghc-internal/cbits/pext.c - libraries/ghc-internal/src/GHC/Internal/TH/Lib.hs - libraries/ghc-internal/src/GHC/Internal/TH/Lift.hs - libraries/ghc-internal/src/GHC/Internal/TH/Syntax.hs - libraries/ghci/GHCi/Message.hs - libraries/ghci/GHCi/ObjLink.hs - libraries/ghci/GHCi/Run.hs - libraries/template-haskell/Language/Haskell/TH/Lib.hs - libraries/template-haskell/Language/Haskell/TH/Quote.hs - libraries/template-haskell/Language/Haskell/TH/Syntax.hs - libraries/template-haskell/tests/all.T - rts/js/mem.js - testsuite/config/ghc - testsuite/driver/testlib.py - testsuite/tests/core-to-stg/T24124.stderr - testsuite/tests/deSugar/should_compile/T2431.stderr - testsuite/tests/dmdanal/should_compile/T16029.stdout - testsuite/tests/dmdanal/sigs/T21119.stderr - testsuite/tests/dmdanal/sigs/T21888.stderr - testsuite/tests/ghci.debugger/scripts/break011.stdout - testsuite/tests/ghci.debugger/scripts/break024.stdout - testsuite/tests/indexed-types/should_compile/T2238.hs - testsuite/tests/interface-stability/template-haskell-exports.stdout - + testsuite/tests/llvm/should_run/T20645.hs - + testsuite/tests/llvm/should_run/T20645.stdout - testsuite/tests/llvm/should_run/all.T - testsuite/tests/numeric/should_compile/T15547.stderr - testsuite/tests/numeric/should_compile/T23907.stderr - testsuite/tests/numeric/should_run/foundation.hs - testsuite/tests/quasiquotation/T4491/test.T - testsuite/tests/roles/should_compile/Roles14.stderr - testsuite/tests/roles/should_compile/Roles3.stderr - testsuite/tests/roles/should_compile/Roles4.stderr - testsuite/tests/simplCore/should_compile/DataToTagFamilyScrut.stderr - testsuite/tests/simplCore/should_compile/T15205.stderr - testsuite/tests/simplCore/should_compile/T17366.stderr - testsuite/tests/simplCore/should_compile/T17966.stderr - testsuite/tests/simplCore/should_compile/T22309.stderr - testsuite/tests/simplCore/should_compile/T22375DataFamily.stderr - testsuite/tests/simplCore/should_compile/T23307.stderr - testsuite/tests/simplCore/should_compile/T23307a.stderr - testsuite/tests/simplCore/should_compile/T25389.stderr - testsuite/tests/simplCore/should_compile/T25713.stderr - testsuite/tests/simplCore/should_compile/T7360.stderr - testsuite/tests/simplStg/should_compile/T15226b.stderr - testsuite/tests/tcplugins/CtIdPlugin.hs - testsuite/tests/th/Makefile - testsuite/tests/typecheck/should_compile/Makefile - testsuite/tests/typecheck/should_compile/T12763.stderr - testsuite/tests/typecheck/should_compile/T14774.stdout - testsuite/tests/typecheck/should_compile/T18406b.stderr - testsuite/tests/typecheck/should_compile/T18529.stderr - testsuite/tests/typecheck/should_compile/all.T - testsuite/tests/unboxedsums/unpack_sums_7.stdout - testsuite/tests/wasm/should_run/control-flow/LoadCmmGroup.hs - testsuite/tests/wasm/should_run/control-flow/RunWasm.hs - utils/genprimopcode/Lexer.x - utils/genprimopcode/Main.hs - utils/genprimopcode/Parser.y - utils/genprimopcode/ParserM.hs - utils/genprimopcode/Syntax.hs - 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/f45442e17774e69f3d630cda8f15c0… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/f45442e17774e69f3d630cda8f15c0… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/fendor/bump-bootstrap-ci-version] 2 commits: Bump dependencies of hadrian-bootstrap-gen to use GHC 9.6.7
by Hannes Siebenhandl (＠fendor) 18 Aug '25

18 Aug '25

Hannes Siebenhandl pushed to branch wip/fendor/bump-bootstrap-ci-version at Glasgow Haskell Compiler / GHC Commits: 9092c0a9 by fendor at 2025-08-18T12:21:47+02:00 Bump dependencies of hadrian-bootstrap-gen to use GHC 9.6.7 - - - - - 20f87cee by fendor at 2025-08-18T12:22:39+02:00 Update bootstrap `plan-*.json`s to GHC 9.10.1 and 9.12.2 Remove older GHC bootstrap configurations. We require GHC 9.10.1 to build GHC. - - - - - 21 changed files: - hadrian/bootstrap/generate_bootstrap_plans - hadrian/bootstrap/hadrian-bootstrap-gen.cabal - hadrian/bootstrap/plan-9_10_1.json - hadrian/bootstrap/plan-9_6_5.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_6.json - − hadrian/bootstrap/plan-9_8_1.json - − hadrian/bootstrap/plan-9_8_2.json - hadrian/bootstrap/plan-bootstrap-9_10_1.json - hadrian/bootstrap/plan-bootstrap-9_6_5.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_6.json - − hadrian/bootstrap/plan-bootstrap-9_8_1.json - − hadrian/bootstrap/plan-bootstrap-9_8_2.json - hadrian/bootstrap/src/Main.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/726ecc419cfcbc4aef56d31e527897… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/726ecc419cfcbc4aef56d31e527897… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/haanss/depdir] 73 commits: Renaming around predicate types
by Hassan Al-Awwadi (＠hassan.awwadi) 18 Aug '25

18 Aug '25

Hassan Al-Awwadi pushed to branch wip/haanss/depdir at Glasgow Haskell Compiler / GHC Commits: a49eca26 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Renaming around predicate types .. we were (as it turned out) abstracting over type-class selectors in SPECIALISATION rules! Wibble isEqPred - - - - - f80375dd by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Refactor of Specialise.hs This patch just tidies up `specHeader` a bit, removing one of its many results, and adding some comments. No change in behaviour. Also add a few more `HasDebugCallStack` contexts. - - - - - 1bd12371 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Improve treatment of SPECIALISE pragmas -- again! This MR does another major refactor of the way that SPECIALISE pragmas work, to fix #26115, #26116, #26117. * We now /always/ solve forall-constraints in an all-or-nothing way. See Note [Solving a Wanted forall-constraint] in GHC.Tc.Solver.Solve This means we might have unsolved quantified constraints, which need to be reported. See `inert_insts` in `getUnsolvedInerts`. * I refactored the short-cut solver for type classes to work by recursively calling the solver rather than by having a little baby solver that kept being not clever enough. See Note [Shortcut solving] in GHC.Tc.Solver.Dict * I totally rewrote the desugaring of SPECIALISE pragmas, again. The new story is in Note [Desugaring new-form SPECIALISE pragmas] in GHC.HsToCore.Binds Both old-form and new-form SPECIALISE pragmas now route through the same function `dsSpec_help`. The tricky function `decomposeRuleLhs` is now used only for user-written RULES, not for SPECIALISE pragmas. * I improved `solveOneFromTheOther` to account for rewriter sets. Previously it would solve a non-rewritten dict from a rewritten one. For equalities we were already dealing with this, in Some incidental refactoring * A small refactor: `ebv_tcvs` in `EvBindsBar` now has a list of coercions, rather than a set of tyvars. We just delay taking the free vars. * GHC.Core.FVs.exprFVs now returns /all/ free vars. Use `exprLocalFVs` for Local vars. Reason: I wanted another variant for /evidence/ variables. * Ues `EvId` in preference to `EvVar`. (Evidence variables are always Ids.) Rename `isEvVar` to `isEvId`. * I moved `inert_safehask` out of `InertCans` and into `InertSet` where it more properly belongs. Compiler-perf changes: * There was a palpable bug (#26117) which this MR fixes in newWantedEvVar, which bypassed all the subtle overlapping-Given and shortcutting logic. (See the new `newWantedEvVar`.) Fixing this but leads to extra dictionary bindings; they are optimised away quickly but they made CoOpt_Read allocate 3.6% more. * Hpapily T15164 improves. * The net compiler-allocation change is 0.0% Metric Decrease: T15164 Metric Increase: CoOpt_Read T12425 - - - - - 953fd8f1 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Solve forall-constraints immediately, or not at all This MR refactors the constraint solver to solve forall-constraints immediately, rather than emitting an implication constraint to be solved later. The most immediate motivation was that when solving quantified constraints in SPECIALISE pragmas, we really really don't want to leave behind half- solved implications. Also it's in tune with the approach of the new short-cut solver, which recursively invokes the solver. It /also/ saves quite a bit of plumbing; e.g - The `wl_implics` field of `WorkList` is gone, - The types of `solveSimpleWanteds` and friends are simplified. - An EvFun contains binding, rather than an EvBindsVar ref-cell that will in the future contain bindings. That makes `evVarsOfTerm` simpler. Much nicer. It also improves error messages a bit. All described in Note [Solving a Wanted forall-constraint] in GHC.Tc.Solver.Solve. One tiresome point: in the tricky case of `inferConstraintsCoerceBased` we make a forall-constraint. This we /do/ want to partially solve, so we can infer a suitable context. (I'd be quite happy to force the user to write a context, bt I don't want to change behavior.) So we want to generate an /implication/ constraint in `emitPredSpecConstraints` rather than a /forall-constraint/ as we were doing before. Discussed in (WFA3) of the above Note. Incidental refactoring * `GHC.Tc.Deriv.Infer.inferConstraints` was consulting the state monad for the DerivEnv that the caller had just consulted. Nicer to pass it as an argument I think, so I have done that. No change in behaviour. - - - - - 6921ab42 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Remove duplicated code in Ast.hs for evTermFreeVars This is just a tidy up. - - - - - 1165f587 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Small tc-tracing changes only - - - - - 0776ffe0 by Simon Hengel at 2025-07-26T04:54:20-04:00 Respect `-fdiagnostics-as-json` for core diagnostics (see #24113) - - - - - cc1116e0 by Andrew Lelechenko at 2025-07-26T04:55:01-04:00 docs: add since pragma to Data.List.NonEmpty.mapMaybe - - - - - ee2dc248 by Simon Hengel at 2025-07-31T06:25:35-04:00 Update comments on `OptKind` to reflect the code reality - - - - - b029633a by Wen Kokke at 2025-07-31T06:26:21-04:00 rts: Disable --eventlog-flush-interval unless compiled with -threaded. This commit fixes issue #26222: Using --eventlog-flush-interval with the non-threaded RTS leads to eventlog corruption. https://gitlab.haskell.org/ghc/ghc/-/issues/26222 This commit makes three changes when code is compiled against the non-threaded RTS: 1. It disables the --eventlog-flush-interval flag. 2. It disables the documentation for the --eventlog-flush-interval flag. 3. It disables the relevant state from RtsConfig and code from Timer. 4. It updates the entry for --eventlog-flush-interval in the users guide. - - - - - 31159f1d by Wen Kokke at 2025-07-31T06:26:21-04:00 rts: Split T20006 into tests with and without -threaded - - - - - 618687ef by Simon Hengel at 2025-07-31T06:27:03-04:00 docs/users_guide/win32-dlls.rst: Remove references to `readline` - - - - - 083e40f1 by Rodrigo Mesquita at 2025-08-01T04:38:23-04:00 debugger: Uniquely identify breakpoints by internal id Since b85b11994e0130ff2401dd4bbdf52330e0bcf776 (support inlining breakpoints), a breakpoint has been identified at runtime by *two* pairs of <module,index>. - The first, aka a 'BreakpointId', uniquely identifies a breakpoint in the source of a module by using the Tick index. A Tick index can index into ModBreaks.modBreaks_xxx to fetch source-level information about where that tick originated. - When a user specifies e.g. a line breakpoint using :break, we'll reverse engineer what a Tick index for that line - We update the `BreakArray` of that module (got from the LoaderState) at that tick index to `breakOn`. - A BCO we can stop at is headed by a BRK_FUN instruction. This instruction stores in an operand the `tick index` it is associated to. We look it up in the associated `BreakArray` (also an operand) and check wheter it was set to `breakOn`. - The second, aka the `ibi_info_mod` + `ibi_info_ix` of the `InternalBreakpointId`, uniquely index into the `imodBreaks_breakInfo` -- the information we gathered during code generation about the existing breakpoint *ocurrences*. - Note that with optimisation there may be many occurrences of the same source-tick-breakpoint across different modules. The `ibi_info_ix` is unique per occurrence, but the `bi_tick_ix` may be shared. See Note [Breakpoint identifiers] about this. - Note that besides the tick ids, info ids are also stored in `BRK_FUN` so the break handler can refer to the associated `CgBreakInfo`. In light of that, the driving changes come from the desire to have the info_id uniquely identify the breakpoint at runtime, and the source tick id being derived from it: - An InternalBreakpointId should uniquely identify a breakpoint just from the code-generation identifiers of `ibi_info_ix` and `ibi_info_mod`. So we drop `ibi_tick_mod` and `ibi_tick_ix`. - A BRK_FUN instruction need only record the "internal breakpoint id", not the tick-level id. So we drop the tick mod and tick index operands. - A BreakArray should be indexed by InternalBreakpointId rather than BreakpointId That means we need to do some more work when setting a breakpoint. Specifically, we need to figure out the internal ids (occurrences of a breakpoint) from the source-level BreakpointId we want to set the breakpoint at (recall :break refers to breaks at the source level). Besides this change being an improvement to the handling of breakpoints (it's clearer to have a single unique identifier than two competing ones), it unlocks the possibility of generating "internal" breakpoints during Cg (needed for #26042). It should also be easier to introduce multi-threaded-aware `BreakArrays` following this change (needed for #26064). Se also the new Note [ModBreaks vs InternalModBreaks] On i386-linux: ------------------------- Metric Decrease: interpreter_steplocal ------------------------- - - - - - bf03bbaa by Simon Hengel at 2025-08-01T04:39:05-04:00 Don't use MCDiagnostic for `ghcExit` This changes the error message of `ghcExit` from ``` <no location info>: error: Compilation had errors ``` to ``` Compilation had errors ``` - - - - - a889ec75 by Simon Hengel at 2025-08-01T04:39:05-04:00 Respect `-fdiagnostics-as-json` for driver diagnostics (see #24113) - - - - - 81577fe7 by Ben Gamari at 2025-08-02T04:29:39-04:00 configure: Allow override of CrossCompiling As noted in #26236, the current inference logic is a bit simplistic. In particular, there are many cases (e.g. building for a new libc) where the target and host triples may differ yet we are still able to run the produced artifacts as native code. Closes #26236. - - - - - 01136779 by Andreas Klebinger at 2025-08-02T04:30:20-04:00 rts: Support COFF BigObj files in archives. - - - - - 1f9e4f54 by Stephen Morgan at 2025-08-03T15:14:08+10:00 refactor: Modify Data.List.sortOn to use (>) instead of compare. (#26184) This lets a more efficient (>) operation be used if one exists. This is technically a breaking change for malformed Ord instances, where x > y is not equivalent to compare x y == GT. Discussed by the CLC in issue #332: https://github.com/haskell/core-libraries-committee/issues/332 - - - - - 4f6bc9cf by fendor at 2025-08-04T17:50:06-04:00 Revert "base: Expose Backtraces constructor and fields" This reverts commit 17db44c5b32fff82ea988fa4f1a233d1a27bdf57. - - - - - bcdec657 by Zubin Duggal at 2025-08-05T10:37:29+05:30 compiler: Export a version of `newNameCache` that is not prone to footguns. `newNameCache` must be initialized with both a non-"reserved" unique tag, as well as a list of known key names. Failing to do so results in hard to debug unique conflicts. It is difficult for API users to tell which unique tags are safe to use. So instead of leaving this up to the user to decide, we now export a version of `newNameCache` which uses a guaranteed non-reserved unique tag. In fact, this is now the way the unique tag is initialized for all invocations of the compiler. The original version of `newNameCache` is now exported as `newNameCache'` for advanced users. We also deprecate `initNameCache` as it is also prone to footguns and is completely subsumed in functionality by `newNameCache` and `newNameCache'`. Fixes #26135 and #26055 - - - - - 57d3b4a8 by Andrew Lelechenko at 2025-08-05T18:36:31-04:00 hadrian: bump Stackage snapshot to LTS 24.2 / GHC 9.10.2 In line with #25693 we should use GHC 9.10 as a boot compiler, while Hadrian stack.yaml was stuck on GHC 9.6. - - - - - c2a78cea by Peng Fan at 2025-08-05T18:37:27-04:00 NCG/LA64: implement atomic write with finer-grained DBAR hints Signed-off-by: Peng Fan <fanpeng(a)loongson.cn> - - - - - 95231c8e by Teo Camarasu at 2025-08-06T08:35:58-04:00 CODEOWNERS: add CLC as codeowner of base We also remove hvr, since I think he is no longer active - - - - - 77df0ded by Andrew Lelechenko at 2025-08-06T08:36:39-04:00 Bump submodule text to 2.1.3 - - - - - 8af260d0 by Nikolaos Chatzikonstantinou at 2025-08-06T08:37:23-04:00 docs: fix internal import in getopt examples This external-facing doc example shouldn't mention GHC internals when using 'fromMaybe'. - - - - - 69cc16ca by Marc Scholten at 2025-08-06T15:51:28-04:00 README: Add note on ghc.nix - - - - - 93a2f450 by Daniel Díaz at 2025-08-06T15:52:14-04:00 Link to the "Strict Bindings" docs from the linear types docs Strict Bidings are relevant for the kinds of multiplicity annotations linear lets support. - - - - - 246b7853 by Matthew Pickering at 2025-08-07T06:58:30-04:00 level imports: Check the level of exported identifiers The level imports specification states that exported identifiers have to be at level 0. This patch adds the requird level checks that all explicitly mentioned identifiers occur at level 0. For implicit export specifications (T(..) and module B), only level 0 identifiers are selected for re-export. ghc-proposal: https://github.com/ghc-proposals/ghc-proposals/pull/705 Fixes #26090 - - - - - 358bc4fc by fendor at 2025-08-07T06:59:12-04:00 Bump GHC on darwin CI to 9.10.1 - - - - - 1903ae35 by Matthew Pickering at 2025-08-07T12:21:10+01:00 ipe: Place strings and metadata into specific .ipe section By placing the .ipe metadata into a specific section it can be stripped from the final binary if desired. ``` objcopy --remove-section .ipe <binary> upx <binary> ``` Towards #21766 - - - - - c80dd91c by Matthew Pickering at 2025-08-07T12:22:42+01:00 ipe: Place magic word at the start of entries in the .ipe section The magic word "IPE\nIPE\n" is placed at the start of .ipe sections, then if the section is stripped, we can check whether the section starts with the magic word or not to determine whether there is metadata present or not. Towards #21766 - - - - - cab42666 by Matthew Pickering at 2025-08-07T12:22:42+01:00 ipe: Use stable IDs for IPE entries IPEs have historically been indexed and reported by their address. This makes it impossible to compare profiles between runs, since the addresses may change (due to ASLR) and also makes it tricky to separate out the IPE map from the binary. This small patch adds a stable identifier for each IPE entry. The stable identifier is a single 64 bit word. The high-bits are a per-module identifier and the low bits identify which entry in each module. 1. When a node is added into the IPE buffer it is assigned a unique identifier from an incrementing global counter. 2. Each entry already has an index by it's position in the `IpeBufferListNode`. The two are combined together by the `IPE_ENTRY_KEY` macro. Info table profiling uses the stable identifier rather than the address of the info table. The benefits of this change are: * Profiles from different runs can be easily compared * The metadata can be extracted from the binary (via the eventlog for example) and then stripped from the executable. Fixes #21766 - - - - - 2860a9a5 by Simon Peyton Jones at 2025-08-07T20:29:18-04:00 In TcSShortCut, typechecker plugins should get empty Givens Solving in TcShortCut mode means /ignoring the Givens/. So we should not pass them to typechecker plugins! Fixes #26258. This is a fixup to the earlier MR: commit 1bd12371feacc52394a0e660ef9349f9e8ee1c06 Author: Simon Peyton Jones <simon.peytonjones(a)gmail.com> Date: Mon Jul 21 10:04:49 2025 +0100 Improve treatment of SPECIALISE pragmas -- again! - - - - - 2157db2d by sterni at 2025-08-08T15:32:39-04:00 hadrian: enable terminfo if --with-curses-* flags are given The GHC make build system used to support WITH_TERMINFO in ghc.mk which allowed controlling whether to build GHC with terminfo or not. hadrian has replaced this with a system where this is effectively controlled by the cross-compiling setting (the default WITH_TERMINFO value was bassed on CrossCompiling, iirc). This behavior is undesireable in some cases and there is not really a good way to work around it. Especially for downstream packagers, modifying this via UserSettings is not really feasible since such a source file has to be kept in sync with Settings/Default.hs manually since it can't import Settings.Default or any predefined Flavour definitions. To avoid having to add a new setting to cfg/system.config and/or a new configure flag (though I'm happy to implement both if required), I've chosen to take --with-curses-* being set explicitly as an indication that the user wants to have terminfo enabled. This would work for Nixpkgs which sets these flags [1] as well as haskell.nix [2] (which goes to some extreme measures [3] [4] to force terminfo in all scenarios). In general, I'm an advocate for making the GHC build be the same for native and cross insofar it is possible since it makes packaging GHC and Haskell related things while still supporting cross much less compilicated. A more minimal GHC with reduced dependencies should probably be a specific flavor, not the default. Partially addresses #26288 by forcing terminfo to be built if the user explicitly passes configure flags related to it. However, it isn't built by default when cross-compiling yet nor is there an explicit way to control the package being built. [1]: https://github.com/NixOS/nixpkgs/blob/3a7266fcefcb9ce353df49ba3f292d0644376… [2]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa… [3]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa… [4]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa… - - - - - b3c31488 by David Feuer at 2025-08-08T15:33:21-04:00 Add default QuasiQuoters Add `defaultQuasiQuoter` and `namedDefaultQuasiQuoter` to make it easier to write `QuasiQuoters` that give helpful error messages when they're used in inappropriate contexts. Closes #24434. - - - - - 03555ed8 by Sylvain Henry at 2025-08-10T22:20:57-04:00 Handle non-fractional CmmFloats in Cmm's CBE (#26229) Since f8d9d016305be355f518c141f6c6d4826f2de9a2, toRational for Float and Double converts float's infinity and NaN into Rational's infinity and NaN (respectively 1%0 and 0%0). Cmm CommonBlockEliminator hashing function needs to take these values into account as they can appear as literals now. See added testcase. - - - - - 6c956af3 by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00 Fix extensions list in `DoAndIfThenElse` docs - - - - - 6dc420b1 by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00 Document status of `RelaxedPolyRec` extension This adds a brief extension page explaining the status of the `RelaxedPolyRec` extension. The behaviour of this mode is already explained elsewhere, so this page is mainly for completeness so that various lists of extensions have somewhere to point to for this flag. Fixes #18630 - - - - - 18036d52 by Simon Peyton Jones at 2025-08-11T11:31:20-04:00 Take more care in zonkEqTypes on AppTy/AppTy This patch fixes #26256. See Note [zonkEqTypes and the PKTI] in GHC.Tc.Solver.Equality - - - - - c8d76a29 by Zubin Duggal at 2025-08-11T11:32:02-04:00 ci: upgrade bootstrap compiler on windows to 9.10.1 - - - - - 34fc50c1 by Ben Gamari at 2025-08-11T13:36:25-04:00 Kill IOPort# This type is unnecessary, having been superceded by `MVar` and a rework of WinIO's blocking logic. See #20947. See https://github.com/haskell/core-libraries-committee/issues/213. - - - - - 56b32c5a by sheaf at 2025-08-12T10:00:19-04:00 Improve deep subsumption This commit improves the DeepSubsumption sub-typing implementation in GHC.Tc.Utils.Unify.tc_sub_type_deep by being less eager to fall back to unification. For example, we now are properly able to prove the subtyping relationship ((∀ a. a->a) -> Int) -> Bool <= β[tau] Bool for an unfilled metavariable β. In this case (with an AppTy on the right), we used to fall back to unification. No longer: now, given that the LHS is a FunTy and that the RHS is a deep rho type (does not need any instantiation), we try to make the RHS into a FunTy, viz. β := (->) γ We can then continue using covariance & contravariance of the function arrow, which allows us to prove the subtyping relationship, instead of trying to unify which would cause us to error out with: Couldn't match expected type ‘β’ with actual type ‘(->) ((∀ a. a -> a) -> Int) See Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify. The other main improvement in this patch concerns type inference. The main subsumption logic happens (before & after this patch) in GHC.Tc.Gen.App.checkResultTy. However, before this patch, all of the DeepSubsumption logic only kicked in in 'check' mode, not in 'infer' mode. This patch adds deep instantiation in the 'infer' mode of checkResultTy when we are doing deep subsumption, which allows us to accept programs such as: f :: Int -> (forall a. a->a) g :: Int -> Bool -> Bool test1 b = case b of True -> f False -> g test2 b = case b of True -> g False -> f See Note [Deeply instantiate in checkResultTy when inferring]. Finally, we add representation-polymorphism checks to ensure that the lambda abstractions we introduce when doing subsumption obey the representation polymorphism invariants of Note [Representation polymorphism invariants] in GHC.Core. See Note [FunTy vs FunTy case in tc_sub_type_deep]. This is accompanied by a courtesy change to `(<.>) :: HsWrapper -> HsWrapper -> HsWrapper`, adding the equation: WpCast c1 <.> WpCast c2 = WpCast (c1 `mkTransCo` c2) This is useful because mkWpFun does not introduce an eta-expansion when both of the argument & result wrappers are casts; so this change allows us to avoid introducing lambda abstractions when casts suffice. Fixes #26225 - - - - - d175aff8 by Sylvain Henry at 2025-08-12T10:01:31-04:00 Add regression test for #18619 - - - - - a3983a26 by Sylvain Henry at 2025-08-12T10:02:20-04:00 RTS: remove some TSAN annotations (#20464) Use RELAXED_LOAD_ALWAYS macro instead. - - - - - 0434af81 by Ben Gamari at 2025-08-12T10:03:02-04:00 Bump time submodule to 1.15 Also required bumps of Cabal, directory, and hpc. - - - - - 62899117 by Florian Ragwitz at 2025-08-13T21:01:34-04:00 Extend record-selector usage ticking to all binds using a record field This extends the previous handling of ticking for RecordWildCards and NamedFieldPuns to all var bindings that involve record selectors. Note that certain patterns such as `Foo{foo = 42}` will currently not tick the `foo` selector, as ticking is triggered by `HsVar`s. Closes #26191. - - - - - b37b3af7 by Florian Ragwitz at 2025-08-13T21:01:34-04:00 Add release notes for 9.16.1 and move description of latest HPC changes there. - - - - - a5e4b7d9 by Ben Gamari at 2025-08-13T21:02:18-04:00 rts: Clarify rationale for undefined atomic wrappers Since c06e3f46d24ef69f3a3d794f5f604cb8c2a40cbc the RTS has declared various atomic operation wrappers defined by ghc-internal as undefined. While the rationale for this isn't clear from the commit message, I believe that this is necessary due to the unregisterised backend. Specifically, the code generator will reference these symbols when compiling RTS Cmm sources. - - - - - 50842f83 by Andreas Klebinger at 2025-08-13T21:03:01-04:00 Make unexpected LLVM versions a warning rather than an error. Typically a newer LLVM version *will* work so erroring out if a user uses a newer LLVM version is too aggressive. Fixes #25915 - - - - - c91e2650 by fendor at 2025-08-13T21:03:43-04:00 Store `StackTrace` and `StackSnapshot` in `Backtraces` Instead of decoding the stack traces when collecting the `Backtraces`, defer this decoding until actually showing the `Backtraces`. This allows users to customise how `Backtraces` are displayed by using a custom implementation of `displayExceptionWithInfo`, overwriting the default implementation for `Backtraces` (`displayBacktraces`). - - - - - dee28cdd by fendor at 2025-08-13T21:03:43-04:00 Allow users to customise the collection of exception annotations Add a global `CollectExceptionAnnotationMechanism` which determines how `ExceptionAnnotation`s are collected upon throwing an `Exception`. This API is exposed via `ghc-experimental`. By overriding how we collect `Backtraces`, we can control how the `Backtraces` are displayed to the user by newtyping `Backtraces` and giving a different instance for `ExceptionAnnotation`. A concrete use-case for this feature is allowing us to experiment with alternative stack decoders, without having to modify `base`, which take additional information from the stack frames. This commit does not modify how `Backtraces` are currently collected or displayed. - - - - - 66024722 by fendor at 2025-08-13T21:03:43-04:00 Expose Backtraces internals from ghc-experimental Additionally, expose the same API `base:Control.Exception.Backtrace` to make it easier to use as a drop-in replacement. - - - - - a766286f by Reed Mullanix at 2025-08-13T21:04:36-04:00 ghc-internal: Fix naturalAndNot for NB/NS case When the first argument to `naturalAndNot` is larger than a `Word` and the second is `Word`-sized, `naturalAndNot` will truncate the result: ``` >>> naturalAndNot ((2 ^ 65) .|. (2 ^ 3)) (2 ^ 3) 0 ``` In contrast, `naturalAndNot` does not truncate when both arguments are larger than a `Word`, so this appears to be a bug. Luckily, the fix is pretty easy: we just need to call `bigNatAndNotWord#` instead of truncating. Fixes #26230 - - - - - 3506fa7d by Simon Hengel at 2025-08-13T21:05:18-04:00 Report -pgms as a deprecated flag (instead of reporting an unspecific warning) Before: on the commandline: warning: Object splitting was removed in GHC 8.8 After: on the commandline: warning: [GHC-53692] [-Wdeprecated-flags] -pgms is deprecated: Object splitting was removed in GHC 8.8 - - - - - 51c701fe by Zubin Duggal at 2025-08-13T21:06:00-04:00 testsuite: Be more permissive when filtering out GNU_PROPERTY_TYPE linker warnings The warning text is slightly different with ld.bfd. Fixes #26249 - - - - - dfe6f464 by Simon Hengel at 2025-08-13T21:06:43-04:00 Refactoring: Don't misuse `MCDiagnostic` for lint messages `MCDiagnostic` is meant to be used for compiler diagnostics. Any code that creates `MCDiagnostic` directly, without going through `GHC.Driver.Errors.printMessage`, side steps `-fdiagnostics-as-json` (see e.g. !14475, !14492 !14548). To avoid this in the future I want to control more narrowly who creates `MCDiagnostic` (see #24113). Some parts of the compiler use `MCDiagnostic` purely for formatting purposes, without creating any real compiler diagnostics. This change introduces a helper function, `formatDiagnostic`, that can be used in such cases instead of constructing `MCDiagnostic`. - - - - - a8b2fbae by Teo Camarasu at 2025-08-13T21:07:24-04:00 rts: ensure MessageBlackHole.link is always a valid closure We turn a MessageBlackHole into an StgInd in wakeBlockingQueue(). Therefore it's important that the link field, which becomes the indirection field, always points to a valid closure. It's unclear whether it's currently possible for the previous behaviour to lead to a crash, but it's good to be consistent about this invariant nonetheless. Co-authored-by: Andreas Klebinger <klebinger.andreas(a)gmx.at> - - - - - 4021181e by Teo Camarasu at 2025-08-13T21:07:24-04:00 rts: spin if we see a WHITEHOLE in messageBlackHole When a BLACKHOLE gets cancelled in raiseAsync, we indirect to a THUNK. GC can then shortcut this, replacing our BLACKHOLE with a fresh THUNK. This THUNK is not guaranteed to have a valid indirectee field. If at the same time, a message intended for the previous BLACKHOLE is processed and concurrently we BLACKHOLE the THUNK, thus temporarily turning it into a WHITEHOLE, we can get a segfault, since we look at the undefined indirectee field of the THUNK The fix is simple: spin if we see a WHITEHOLE, and it will soon be replaced with a valid BLACKHOLE. Resolves #26205 - - - - - 1107af89 by Oleg Grenrus at 2025-08-13T21:08:06-04:00 Allow defining HasField instances for naughty fields Resolves #26295 ... as HasField solver doesn't solve for fields with "naughty" selectors, we could as well allow defining HasField instances for these fields. - - - - - 020e7587 by Sylvain Henry at 2025-08-13T21:09:00-04:00 Fix Data.List unqualified import warning - - - - - fd811ded by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Make injecting implicit bindings into its own pass Previously we were injecting "impliicit bindings" (data constructor worker and wrappers etc) - both at the end of CoreTidy, - and at the start of CorePrep This is unpleasant and confusing. This patch puts it it its own pass, addImplicitBinds, which runs between the two. The function `GHC.CoreToStg.AddImplicitBinds.addImplicitBinds` now takes /all/ TyCons, not just the ones for algebraic data types. That change ripples through to - corePrepPgm - doCodeGen - byteCodeGen All take [TyCon] which includes all TyCons - - - - - 9bd7fcc5 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Implement unary classes The big change is described exhaustively in Note [Unary class magic] in GHC.Core.TyCon Other changes * We never unbox class dictionaries in worker/wrapper. This has been true for some time now, but the logic is now centralised in functions in GHC.Core.Opt.WorkWrap.Utils, namely `canUnboxTyCon`, and `canUnboxArg` See Note [Do not unbox class dictionaries] in GHC.Core.Opt.WorkWrap.Utils. * Refactored the `notWorthFloating` logic in GHc.Core.Opt.SetLevels. I can't remember if I actually changed any behaviour here, but if so it's only in a corner cases. * Fixed a bug in `GHC.Core.TyCon.isEnumerationTyCon`, which was wrongly returning True for (##). * Remove redundant Role argument to `liftCoSubstWithEx`. It was always Representational. * I refactored evidence generation in the constraint solver: * Made GHC.Tc.Types.Evidence contain better abstactions for evidence generation. * I deleted the file `GHC.Tc.Types.EvTerm` and merged its (small) contents elsewhere. It wasn't paying its way. * Made evidence for implicit parameters go via a proper abstraction. * Fix inlineBoringOk; see (IB6) in Note [inlineBoringOk] This fixes a slowdown in `countdownEffectfulDynLocal` in the `effectful` library. Smaller things * Rename `isDataTyCon` to `isBoxedDataTyCon`. * GHC.Core.Corecion.liftCoSubstWithEx was only called with Representational role, so I baked that into the function and removed the argument. * Get rid of `GHC.Core.TyCon.tyConSingleAlgDataCon_maybe` in favour of calling `not isNewTyCon` at the call sites; more explicit. * Refatored `GHC.Core.TyCon.isInjectiveTyCon`; but I don't think I changed its behaviour * Moved `decomposeIPPred` to GHC.Core.Predicate Compile time performance changes: geo. mean +0.1% minimum -6.8% maximum +14.4% The +14% one is in T21839c, where it seems that a bit more inlining is taking place. That seems acceptable; and the average change is small Metric Decrease: LargeRecord T12227 T12707 T16577 T21839r T5642 Metric Increase: T15164 T21839c T3294 T5321FD T5321Fun WWRec - - - - - b4075d71 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Slight improvement to pre/postInlineUnconditionally Avoids an extra simplifier iteration - - - - - 9e443596 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Fix a long-standing assertion error in normSplitTyConApp_maybe - - - - - 91310ad0 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00 Add comment to coercion optimiser - - - - - 5b841d82 by Teo Camarasu at 2025-08-14T17:57:56-04:00 template-haskell: move some identifiers from ghc-internal to template-haskell These identifiers are not used internally by the compiler. Therefore we have no reason for them to be in ghc-internal. By moving them to template-haskell, we benefit from it being easier to change them and we avoid having to build them in stage0. Resolves #26048 - - - - - 33e2c7e5 by Teo Camarasu at 2025-08-14T17:57:56-04:00 template-haskell: transfer $infix note to public module This Haddock note should be in the public facing module - - - - - 2a411fc4 by Sylvain Henry at 2025-08-14T17:59:09-04:00 JS: export HEAP8 symbol (#26290) Newer Emscripten requires this. - - - - - 248f78ca by Ben Gamari at 2025-08-14T17:59:51-04:00 users-guide: Drop the THREAD_RUNNABLE event As of f361281c89fbce42865d8b8b27b0957205366186 it is no longer emitted. - - - - - 706d33e3 by Recursion Ninja at 2025-08-15T04:12:12-04:00 Resolving issues #20645 and #26109 Correctly sign extending and casting smaller bit width types for LLVM operations: - bitReverse8# - bitReverse16# - bitReverse32# - byteSwap16# - byteSwap32# - pdep8# - pdep16# - pext8# - pext16# - - - - - 1cdc6f46 by Cheng Shao at 2025-08-15T04:12:56-04:00 hadrian: enforce have_llvm=False for wasm32/js This patch fixes hadrian to always pass have_llvm=False to the testsuite driver for wasm32/js targets. These targets don't really support the LLVM backend, and the optllvm test way doesn't work. We used to special-case wasm32/js to avoid auto-adding optllvm way in testsuite/config/ghc, but this is still problematic if someone writes a new LLVM-related test and uses something like when(have_llvm(), extra_ways(["optllvm"])). So better just enforce have_llvm=False for these targets here. - - - - - f5affd92 by Hassan Al-Awwadi at 2025-08-18T11:56:48+02:00 Adds the fucnction addDependentDirectory to Q, resolving issue #26148. This function adds a new directory to the list of things a module depends upon. That means that when the contents of the directory change, the recompilation checker will notice this and the module will be recompiled. Documentation has also been added for addDependentFunction and addDependentDirectory in the user guide. - - - - - ce0139f5 by Hassan Al-Awwadi at 2025-08-18T11:59:37+02:00 Specify package template haskell in makefile test for addDependentDir - - - - - 415 changed files: - .gitlab/darwin/toolchain.nix - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - CODEOWNERS - README.md - compiler/GHC/Builtin/Names.hs - compiler/GHC/Builtin/PrimOps/Ids.hs - compiler/GHC/Builtin/Types.hs - compiler/GHC/Builtin/Types/Prim.hs - compiler/GHC/Builtin/primops.txt.pp - compiler/GHC/ByteCode/Asm.hs - compiler/GHC/ByteCode/Breakpoints.hs - compiler/GHC/ByteCode/InfoTable.hs - compiler/GHC/ByteCode/Instr.hs - compiler/GHC/ByteCode/Linker.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Cmm.hs - compiler/GHC/Cmm/CommonBlockElim.hs - compiler/GHC/CmmToAsm/LA64/CodeGen.hs - compiler/GHC/CmmToAsm/PPC/Ppr.hs - compiler/GHC/CmmToAsm/Ppr.hs - compiler/GHC/CmmToLlvm/CodeGen.hs - compiler/GHC/CmmToLlvm/Data.hs - 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utils/genprimopcode/Lexer.x - utils/genprimopcode/Main.hs - utils/genprimopcode/Parser.y - utils/genprimopcode/ParserM.hs - utils/genprimopcode/Syntax.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/7fb97bf2cb5948e3b58221a92fbced… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/7fb97bf2cb5948e3b58221a92fbced… You're receiving this email because of your account on gitlab.haskell.org.

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