Zubin pushed to branch ghc-10.0 at Glasgow Haskell Compiler / GHC Commits: 4da783a3 by Rodrigo Mesquita at 2026-06-09T15:02:45+05:30 Add test for #25636 The existing test behaviour of "T23146_liftedeq" changed because the simplifier now does a bit more inlining. We can restore the previous bad behavior by using an OPAQUE pragma. This test doubles as a test for #25636 when run in ghci, so we add it as such. (cherry picked from commit d1ddfd4bcb71d771eab69ca26b855fe1bb4e56ce) - - - - - dacdffe0 by Rodrigo Mesquita at 2026-06-09T15:02:50+05:30 refactor: protoBCOName is always a Name Simplifies the code by removing the unnecessary type argument to ProtoBCO which was always 'Name' (cherry picked from commit b9df40eed42f487c470758c52ce26b532466f8af) - - - - - 1434980c by Rodrigo Mesquita at 2026-06-09T15:02:59+05:30 Allocate static constructors for bytecode This commit adds support for static constructors when compiling and linking ByteCode objects. Top-level StgRhsCon get lowered to ProtoStaticCons rather than to ProtoBCOs. A ProtoStaticCon gets allocated directly as a data con application on the heap (using the new primop newConApp#). Previously, we would allocate a ProtoBCO which, when evaluated, would PACK and return the constructor. A few more details are given in Note [Static constructors in Bytecode]. Secondly, this commit also fixes issue #25636 which was caused by linking *unlifted* constructors in BCO instructions as - (1) a thunk indexing the array of BCOs in a module - (2) which evaluated to a BCO which still had to be evaluated to return the unlifted constructor proper. The (2) issue has been resolved by allocating the static constructors directly. The (1) issue can be resolved by ensuring that we allocate all unlifted top-level constructors eagerly, and leave the knot-tying for the lifted BCOs and top-level constructors only. The top-level unlifted constructors are never mutually recursive, so we can allocate them all in one go as long as we do it in topological order. Lifted fields of unlifted constructors can still be filled by the knot-tied lifted variables since in those fields it is fine to keep those thunks. See Note [Tying the knot in createBCOs] for more details. Fixes #25636 ------------------------- Metric Decrease: LinkableUsage01 ------------------------- (cherry picked from commit 5c2a179efea36296c35f2c273eb614e3efd89f78) - - - - - 359df3a6 by Rodrigo Mesquita at 2026-06-09T15:03:39+05:30 Revert "StgToByteCode: Assert that PUSH_G'd values are lifted" This reverts commit ec26c54d818e0cd328276196930313f66b780905. Ever since f7a22c0f4e9ae0dc767115d4c53fddbd8372b777, we now do support and will link top-level unlifted constructors into evaluated and properly tagged values which we can reference with PUSH_G. This assertion is no longer true and triggered a failure in T25636 (cherry picked from commit cde4705344642cc8a188bcad5a71d99a9ca59e8c) - - - - - 54ffdbcf by Rodrigo Mesquita at 2026-06-09T15:03:46+05:30 refactor: Tag more remote Ptrs as RemotePtr Pure refactor which improves the API of - GHC.ByteCode.Linker - GHC.Runtime.Interpreter - GHC.Runtime.Interpreter.Types.SymbolCache by using `RemotePtr` for more functions which used to return `Ptr`s that could potentially be in a foreign process. E.g. `lookupIE`, `lookupStaticPtr`, etc... (cherry picked from commit c7a7e5b8d6e75223bfd48da447d8a7bb7c99688b) - - - - - 3583edee by Rodrigo Mesquita at 2026-06-09T15:03:54+05:30 Add float# and subword tests for #25636 These tests cover that static constructors in bytecode work correctly for Float# and subword values (Word8#, Word16#) (cherry picked from commit fc59494c363f692bd073d12c7a08331ff02b9bb0) - - - - - 3b9e67ef by Rodrigo Mesquita at 2026-06-09T15:04:01+05:30 test: Validate topoSort logic in createBCOs This test validates that the topological sorting and ordering of the unlifted constructors and lifted constructors in `createBCOs` is correct. See `Note [Tying the knot in createBCOs]` for why tying the knot for the created BCOs is slightly difficult and why the topological sorting is necessary. This test fails when `let topoSortedObjs = topSortObjs objs` is substituted by `let topoSortedObjs = zip [0..] objs`, thus witnessing the toposort logic is correct and necessary. The test calls the ghci `createBCOs` directly because it is currently impossible to construct in Source Haskell a situation where a top-level static unlifted constructor depends on another (we don't have top-level unlifted constructors except for nullary constructors like `Leaf :: (UTree :: UnliftedType)`). This is another test for fix for #25636 (cherry picked from commit 477f521bec17f475e611da3efd28cba106f86017) - - - - - fc901f8d by sheaf at 2026-06-09T15:14:39+05:30 Simplify mkTick This commit simplifies 'GHC.Core.Utils.mkTick', removing the accumulating parameter 'rest' which was suspiciously treating a bunch of different ticks as a group, and moving the group as a whole around the AST, ignoring that the ticks in the group might have different placement properties. The most important change is that we revert the logic (added in 85b0aae2) that allowed ticks to be placed around coercions, which caused serious issues (e.g. #27121). It was just a mistake, as it doesn't make sense to put a tick around a coercion. Also adds Note [Pushing SCCs inwards] which clarifies the logic for pushing SCCs into lambdas, constructor applications, and dropping SCCs around non-function variables (in particular the treatment of splittable ticks). A few other changes are also implemented: - simplify 'can_split' predicate (no functional change) - combine profiling ticks into one when possible Fixes #26878, #26941 and #27121 Co-authored-by: simonpj <simon.peytonjones@gmail.com> (cherry picked from commit 2dadf3b0d057c087af812e5dd33fe4135a4ef19f) - - - - - ed6ed37b by sheaf at 2026-06-09T15:14:39+05:30 Deal with 'noSpec' in 'coreExprToPmLit' This commit makes two separate changes relating to 'GHC.HsToCore.Pmc.Solver.Types.coreExprAsPmLit': 1. Commit 7124e4ad mistakenly marked deferred errors as non-canonical, which led to the introduction of 'nospec' wrappers in the generated Core. This reverts that accident by declaring deferred errors as being canonical, avoiding spurious 'nospec' wrapping. 2. Look through magic identity-like Ids such as 'nospec', 'inline' and 'lazy' in 'coreExprAsPmLit', just like Core Prep does. There might genuinely be incoherent evidence, but that shouldn't obstruct the pattern match checker. See test T27124a. Fixes #25926 #27124 ------------------------- Metric Decrease: T3294 ------------------------- (cherry picked from commit e8a196c65cee32f06c3d99b74af33457511408c7) - - - - - a6d10535 by Luite Stegeman at 2026-06-09T15:14:39+05:30 rts: add a few missing i386 relocations in the rts linker (cherry picked from commit 04d143c02e82e9ca03eb75849959d369d07fb81a) - - - - - 71e68812 by Luite Stegeman at 2026-06-09T15:14:39+05:30 CodeOutput: Fix finalizers on multiple platforms - ELF platforms: emit .fini_array section - wasm32/Darwin: emit initializer with __cxa_atexit call - Windows: use -Wl,--whole-archive to prevent dropping finalizer symbols - rts linker: fix crash/assertion failure unloading objects with finalizers fixes #27072 (cherry picked from commit 014087e7a5753687161a24a1b2bc55c7bf7273fd) - - - - - 9a3ac65f by sheaf at 2026-06-09T15:14:39+05:30 Ensure TcM plugins are only initialised once This commit ensures we keep TcM plugins (typechecker plugins, defaulting plugins and hole fit plugins) running all the way through desugaring, instead of stopping them at the end of typechecking. To do this, the "stop" actions of TcPlugin and DefaultingPlugin are split into two: one for the "post-typecheck" action, and one for the final shutdown action (after desugaring). This allows the plugins to be invoked by the pattern match checker (during desugaring) without having to be repeatedly re-initialised and stopped, fixing #26839. In the process, this commit modifies 'initTc' and 'initTcInteractive', adding an extra argument that describes whether to start/stop the 'TcM' plugins. See Note [Stop TcM plugins after desugaring] for an overview. (cherry picked from commit 1350271b55e30e8b4c3e7b61af889906d82f5e93) - - - - - 8c48198c by Simon Peyton Jones at 2026-06-09T15:14:39+05:30 Fix assertion check in checkResultTy As #27210 shows, the assertion was a little bit too eager. I refactored a bit by moving some code from GHC.Tc.Gen.App to GHC.Tc.Utils.Unify; see the new function tcSubTypeApp, which replaces tcSubTypeDS (cherry picked from commit 9797052b974b3356c34b457558ffda3c1b6a0c48) - - - - - 75cd9831 by Rodrigo Mesquita at 2026-06-09T15:14:39+05:30 New rts Message to {set,unset} TSO flags This commit introduces stg_MSG_SET_TSO_FLAG_info and stg_MSG_UNSET_TSO_FLAG_info, which allows setting flags of a TSO other than yourself. This is especially useful/necessary to set breakpoints and toggle breakpoints of different threads, which is needed to safely implement features like pausing, toggling step-out, toggling step-in per thread, etc. Fixes #27131 ------------------------- Metric Decrease: T3294 ------------------------- (cherry picked from commit 5bd6a96485ff9bfcbf06eaec69776bf8af61b563) - - - - - 43f4503a by Rodrigo Mesquita at 2026-06-09T15:14:39+05:30 test: Add test setting another TSO's flags Introduces a test that runs on two capabilities. The main thread running on Capability 0 sets the flags on a TSO running on Capability 1. The TSO from Capability 1 itself checks whether its flags were set and reports that back. This validates that the RTS messages for setting TSO flags work, even if it doesn't test a harsher scenario with race conditions to exercise why the message passing is necessary for safely setting another TSO's flags. Part of #27131 (cherry picked from commit ce97fd3ed13028034ba27c34a6decdb3460aa4eb) - - - - - b44312d2 by Wen Kokke at 2026-06-09T15:14:39+05:30 rts: Add dynamic trace flags API This commit adds an API to the RTS (exposed via Rts.h) that allows users to dynamically change the trace flags. Prior to this commit, users were able to stop and start the profiling and heap profiling timers (via startProfTimer/stopProfTimer and startHeapProfTimer/stopHeapProfTimer). This extends that functionality to also cover the core event types. The getTraceFlag/setTraceFlag functions read and write the values of the trace flag cache, which is allocated by Trace.c, rather than modifying the members of RtsFlags.TraceFlags. This is done under the assumption that the members of RtsFlags should not be modified after RTS initialisation. Consequently, if the user modifies the trace flags using setTraceFlag, the object returned by getTraceFlags (from base) will not reflect these changes. The trace flags are not protected by locks of any sort. Hence, these functions are not thread-safe. However, the trace flags are not modified by the RTS after initialisation, only read, so the race conditions introduced by one user modifying them are most likely benign. This PR also puts the trace flag cache in a single global struct, as opposed to a collection of global variables, and changes the types of the individual flags from uint8_t to bool, as these have the same size on both Clang and GCC and are a better semantic match. Prior to the change to uint8_t, they had type int, see 42c47cd6. Even with its deprecation in C23, I don't think there should be any issue depending on stdbool.h. The TRACE_X macros are redefined to access the global struct, with values cast to const bool to ensure they are read-only. (cherry picked from commit 1cb1d6728f6c0e83669f2956f3c061966886e4b6) - - - - - e668a66c by Wen Kokke at 2026-06-09T15:14:39+05:30 rts: Ensure TRACE_X values are used in place of RtsFlags.TraceFlags.X (cherry picked from commit 9d54dc947704eb446f8821ae03c421960639cdbd) - - - - - 531f361f by Wen Kokke at 2026-06-09T15:14:39+05:30 rts: Fix nonmoving-GC tracing The current nonmoving-GC tracing functions were written in a different style from the other tracing functions. They were directly implemented as, e.g., a traceConcMarkEnd function that called postConcMarkEnd. The other tracing functions are implemented as, e.g., traceThreadLabel_, a function that posts the thread label event, and traceThreadLabel, a macro that checks whether TRACE_scheduler is set. This commit fixes that implementation, and ensures that the nonmoving-GC tracing functions only emit events if nonmoving-GC tracing is enabled. (cherry picked from commit 418d737b7494d978cf77d567014ae28dadf1359c) - - - - - 61b588bc by Wen Kokke at 2026-06-09T15:14:39+05:30 rts: Add SymI_HasProto for get/setTraceFlag (cherry picked from commit 99f4afa41dc1a8817cf5fe9dda76e3f1bae09f69) - - - - - a0255ae3 by Wen Kokke at 2026-06-09T15:14:39+05:30 rts: Add SymI_HasProto for start/endEventLogging (cherry picked from commit 7e9eb8b9d47d9e2115612155ea8800cfbd20bc5f) - - - - - f07b0b95 by Wen Kokke at 2026-06-09T15:14:39+05:30 rts: Add changelog entry (cherry picked from commit 3a3045fb1a21c1f8f90e4ab88f93ea3f4d238a49) - - - - - 1cba5109 by Wolfgang Jeltsch at 2026-06-09T15:14:40+05:30 Introduce a cache of home module name providers This contribution introduces to the module graph a cache that maps home module names to sets of units providing them and changes the finder to use that cache. This is a performance optimization, especially for multi-home-unit builds. The particular changes are as follows: * In `GHC.Unit.Module.Graph`, `ModuleGraph` is extended with a new field `mg_home_module_name_providers_map`, exposed as `mgHomeModuleNameProvidersMap`. This is a cache that assigns to each home module name the set of IDs of home units that define it. Operations that construct module graphs are updated such that this cache stays synchronized. * In `GHC.Unit.Finder`, `findImportedModule` is changed to pull `mgHomeModuleNameProvidersMap` from `hsc_mod_graph` and pass it to `findImportedModuleNoHsc`, which now does not search home units in arbitrary order but prioritizes those units that the cache mentions as potential providers of the requested module. In addition, this contribution adds variants of the two multi-component compiler performance tests that use 100 units instead of 20, because with just 20 units the benefits from caching of home module name providers are still negligible. The following table shows the total time needed for running both multi-component tests before and after this contribution and with different numbers of units: | # of units | Before | After | |-----------:|-------:|------:| | 20 | 0:12 | 0:12 | | 100 | 0:47 | 0:42 | | 200 | 3:05 | 2:08 | Note that there seems to be a general overhead of 12 seconds that is not attributable to the actual tests, so that the real running times should be 12 seconds smaller than shown above. Resolves #27055. Metric Decrease: MultiComponentModules MultiComponentModulesRecomp Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com> Co-authored-by: Fendor <fendor@posteo.de> (cherry picked from commit 5fab22387a66657e5e19f1ba490f09af1168eb06) - - - - - 854f2f07 by Cheng Shao at 2026-06-09T15:14:40+05:30 testsuite: mark T22159 as fragile This patch marks T22159 as fragile on Windows for issue described in #27248. Before we get to the bottom of those failures, this unblocks newer Windows runners. (cherry picked from commit 38b76b2f1d918f10d2f9d3e57bd0459dfe671d4f) - - - - - 354bc995 by Ian Duncan at 2026-06-09T15:14:40+05:30 AArch64: use ASR not LSR for MO_U_Shr at W8/W16 The unsigned right shift (MO_U_Shr) for sub-word widths (W8, W16) with a variable shift amount was emitting ASR (arithmetic/signed shift right) after zero-extending with UXTB/UXTH. This should be LSR (logical/unsigned shift right). After zero-extension the upper bits happen to be 0 so ASR produces the same result, but it is semantically wrong and would break if the zero-extension were ever optimized away. Includes assembly output test (grep for lsr) and runtime test verifying unsigned right shift of Word8 and Word16 values. (cherry picked from commit 50188615342098345fc2822ea223ab23791bbf49) - - - - - 5514629c by Wen Kokke at 2026-06-09T15:14:40+05:30 rts: Add IPE event class for -l This commit adds a new IPE event class to the -l RTS flag. Previously, IPE events were enabled unconditionally. However, the IPE events can easily grow to hundreds or thousands of megabytes. With the new event class you can pass, e.g., -l-I to disable IPE events. (cherry picked from commit 41c2448bbaed232cdd647f7d152e7872e57e3a9a) - - - - - ac9aedf9 by Wen Kokke at 2026-06-09T15:14:40+05:30 ghc-internal: Add TraceFlags.traceIPE (cherry picked from commit 62536551ae2fd77640f9507f72ad9cd229b40833) - - - - - 491ac71e by Wen Kokke at 2026-06-09T15:14:40+05:30 testsuite: Add test for TraceFlags.traceIpe (cherry picked from commit e45312d10dc8005be96af78732d78d9cfc0ad912) - - - - - 324c2a59 by Wen Kokke at 2026-06-09T15:14:40+05:30 ghc-internal: Add DebugFlags.ipe (cherry picked from commit 4768d9aa13beb60bf3c4d8a8d1c609f3ca7dfdd3) - - - - - dc637bd6 by Wen Kokke at 2026-06-09T15:14:40+05:30 testsuite: Add test for DebugFlags.ipe (cherry picked from commit bc1b5c69d9500d032d6124450f19a687a8b684a5) - - - - - ee40a14e by fendor at 2026-06-09T15:14:40+05:30 Fix regression T27202: `:load` and `:add` work in GHCi To fix the regression there are conceptually two major things that we fix: * We don't remove the `importDirs` from `interactive-session` * When `:add`ing a module, we don't try to find them via PackageImports * The PackageImport is wrong as we can't know the package-name at this stage in ghc/UI.hs What does it mean to not remove the `importDirs` from `interactive-session`? It means that, given some initial `DynFlags`, we will use those `importDirs` in `interactive-session`. The initial `DynFlags`, however, depend on how you initialise the GHC session. For a simple session, initialised by ghc -isrc -this-unit-id main It is simple, just use the `DynFlags` given on the cli. Thus, `main` and `interactive-session` will have the same `DynFlags`, except for the `homeUnitId` and `interactive-session` depends on `main` by construction of the GHCi session. What about a multiple home unit session, though? ghc -unit @unit1 -unit @unit2 What are the `DynFlags` in this cli invocation? It shouldn't be either `@unti1` nor `@unit2`, as the order shouldn't matter or any other implicit condition. For consistency, we decide that the initial `DynFlags` are the top `DynFlags` on the cli, ignoring `-unit` flags. Thus, in this example, there are no `importsDirs` regardless of what we might find in `@unit1` and `@unit2`. But in this invocation: ghc -isrc -unit @unit1 -unit @unit2 The `interactive-session` will have the `importsDirs` `src`. Note, `-isrc` will be inherited in `@unit1` and `@unit2`, so you need to explicitly use `-i` to clear the `importsDirs`, in order to avoid accidentally adding `src` as an import directory to all other home units. This fix has been made possible by the improvements introduced in !15888, which avoids ambiguity when a home unit shares the `importsDirs` with the `interactive-session`, on top of being much faster for multiple home units. Adds regression tests for T27202 for `:load`ing and `:add`ing modules that are located in import directories. (cherry picked from commit 286f1adff3e78d775ff325caff71d0cee25d710b) - - - - - 0477d638 by fendor at 2026-06-09T15:14:40+05:30 Use home unit package db stacks in GHCi prompt and session unit In order to import modules from home unit dependencies (e.g., `Data.Map`), the ghci prompt unit needs to populate its `UnitState`. This is tricky to handle correctly, which `PackageDBFlag`s should we use to populate the `UnitState`? We decide, the most intuitive solution for users is to depend on all `PackageDBFlag`s, so that any dependency can be imported in GHCi. This assumes consistency in the `PackageDBFlag`s, so no two home units specify `PackageDBFlag`s that are inconsistent with each other. We could simply concat all the `PackageDBFlag`s of the existing home units, but later `PackageDBFlag`s shadow earlier ones, leading to the last processed home units' `PackageDBFlag`s to shadow the earlier ones. This is hard to fix, we need to give users the capability to provide ghc options for the ghci prompt home unit. However, as this is considerably more work, we decided on an approximation that should work out most of the time. Package Db stacks in cabal and stack follow a certain structure: -no-user-package-db > -package-db $cabal-store > -package-db $local-db The first two arguments are always the same, namely the `-no-user-package-db` and `-package-db`. We compute the longest common prefix over all home units, and use that as the start of the package db stack. Then, over the rest of the `PackageDBFlag`s, we simply take the union and append them to our initial stack. We assume, that the rest of package dbs only defines very few, "local" units that are usually not shadowing each other. This allows us to get a relatively consistent package database stack for the ghci prompt home unit. Similar reasoning applies to the session unit in order to add modules to the session and have dependencies available in the module. We do something similar for `-package` flags, to make sure only the correct units are actually visible in the ghci session. This time, we simply take the union of all `PackageFlag`s, allowing us to import modules from the home unit dependencies. In the future, it would be beneficial to allow the user to provide the exact ghc options to control the visibilities. For now, this will have to do. (cherry picked from commit 728662de2084069ef53bd5adf2c0e8b1e8814bc0) - - - - - 983f69a7 by fendor at 2026-06-09T15:14:40+05:30 Speed up 'closure' computation in `ghc-pkg` Cache the set of already seen `UnitId`s and use `Set` operations to speed up 'closure' computation. Further simplify the implementation of 'closure' to account for the actual usage. As a consequence, we rename 'closure' to 'brokenPackages' to reflect its purpose better after the simplification. (cherry picked from commit 50e999cae0297be156d3cc6a683fc3c7634428f0) - - - - - f31c6475 by sheaf at 2026-06-09T15:15:53+05:30 TcMPluginHandling: be more lenient when no plugins This change ensures that, if a function such as 'typecheckModule' was invoked with 'NoTcMPlugins', GHC doesn't spuriously complain about TcM plugins having already been stopped, as there were none to start with. (cherry picked from commit 7ecc618466382588b9934c514f178e0b6ff41f49) - - - - - cd744705 by Alan Zimmerman at 2026-06-09T15:15:53+05:30 EPA: Fix span for qualified multiline string Fix the span for a qualified multiline string like Text.""" I'm a multiline Text value ! """ to extend to the end of the entire string, not just the first line. Closes #27274 (cherry picked from commit 3268c610d7011d3b0d2a9357f59ab7aeb47e2da1) - - - - - e2ec33fc by Alan Zimmerman at 2026-06-09T15:18:24+05:30 EPA: Fix exact printing namespace-specified wildcards Ensures correct printing of imports of the form import Data.Bool (data True(data ..)) import Data.Bool (data True(type ..)) Closes #27291 (cherry picked from commit 1f09679081816acb86fd02eb332f0dff7133ddf1) - - - - - 73350b8d by Cheng Shao at 2026-06-09T15:22:30+05:30 wasm: ensure post-linker output is synchronous ESM This patch fixes wasm backend's post-linker output script to ensure it's synchronous ESM and doesn't use top-level await, which doesn't work in ServiceWorkers. Fixes #27257. (cherry picked from commit cccf45da01988801b0c97f7e7ed0160191980226) - - - - - bd2307ab by Zubin Duggal at 2026-06-09T15:22:30+05:30 Update to semaphore-compat 2.0.0 using v2 of the protocol On Linux and other POSIX platforms, GHC's -jsem jobserver client now speaks v2 of the semaphore-compat protocol, which uses Unix domain sockets in place of POSIX named semaphores. This avoids the libc-ABI issues that affected the old implementation. Windows is unaffected and continues to use the v1 protocol (Win32 named semaphores); its reported protocol version remains v1. When GHC receives a -jsem name whose protocol version it does not support, it emits a -Wsemaphore-version-mismatch warning and falls back to -j<N> rather than crashing. ghc --info exposes the supported version in a new "Semaphore version" entry so cabal-install can detect a mismatch before invoking GHC. Users on a cabal-install that predates the v2 update will continue to build successfully on Linux/POSIX, but will lose the cross-process -jsem coordination and fall back to -j<N> per GHC invocation. Users must upgrade to a cabal-install that supports protocol v2 to recover full parallelism. Also fix a leak in cleanupSem (#27253): cleanupSem used to snapshot heldTokens and release them before killing the loop, while the loop's in-flight acquire/release children could still be mutating it. Cleanup now runs inside the loop's own exit handler, after draining the active child via a new activeChild TVar, so the snapshot has no concurrent mutator. See also: - GHC proposal amendment: https://github.com/ghc-proposals/ghc-proposals/pull/673 - cabal-install patch: https://github.com/haskell/cabal/pull/11628 - semaphore-compat MR: https://gitlab.haskell.org/ghc/semaphore-compat/-/merge_requests/8 Bump semaphore-compat submodule to 2.0.0 Fixes #25087 and #27253 (cherry picked from commit 8db331a381ae47ad9ad5c8613f5d3e2588d5dd55) - - - - - de5db87e by Alan Zimmerman at 2026-06-09T15:22:30+05:30 EPA: Record semicolons in HsModifier Ensure the semi colons are captured in the ParsedSource for code like %True;; %False; instance C D It makes HsModifier (and hence HsModifierOf) LocatedA, so the semi colons can be recorded as [TrailingAnn] Also rename pprHsModifiers to pprLHsModifiers to match. Closes #27294 (cherry picked from commit 17be4f1f6be288a03c87778797964cdc51adc8ff) - - - - - d9ee32e8 by fendor at 2026-06-09T15:22:30+05:30 Revert prog003 acceptance We thought the commit 286f1adff3e78d775ff325caff71d0cee25d710b fixed the test, but due to changes to ghci, modules loaded during the GHCi session, the test was actually no longer testing what it set out to do, "fixing" the broken test. As modules are added to the `interactive-session` home unit, the object code needs to be compiled with `-this-unit-id interactive-session`, otherwise the object code won't be used. Once this has been fixed in the test, the test fails as expected again. (cherry picked from commit 8f9917557a7ef290dfa8b913c3a4146289586ec6) - - - - - e271d8ca by mangoiv at 2026-06-09T15:22:30+05:30 libraries/process: bump submodule to v1.6.29.0 This submodule bump resolves a segfault on macos 15. Fixes #27144 (cherry picked from commit 277a3687c4b729e4d1ff4d4503a5673deba5eda7) - - - - - a7539ec5 by mangoiv at 2026-06-09T15:23:54+05:30 libraries/unix: in submodule, don't pick branch 2.7 The 2.7 branch is outdated and the module has been advanced far beyond it anyway, so remove that line. (cherry picked from commit 6779bb0c2d2784182465337ba5e94b7cd8810f2b) - - - - - 48c5e0ae by sheaf at 2026-06-09T15:24:06+05:30 Relax acceptance threshold for T10421 As seen in #27289, the 1% acceptance threshold for this text was overly narrow, resulting in spurious test failures. This commit widens the acceptance threshold to 2%. Fixes #27289. (cherry picked from commit b0233814d63c2802a521dfc7dae08b1ecf494c50) - - - - - 7e645dbd by Luite Stegeman at 2026-06-09T15:24:06+05:30 Fixes for black holes - suspend duplicate work for eager black holes - detect eager black holes in checkBlockingQueues - don't overwrite existing black holes even if they're not in an eager blackhole frame - don't deadlock on self when thunk is already blackholed Fixes #26936 (cherry picked from commit 63ce5770da1712f0da54665d8755772bf38ba51e) - - - - - 1bd35b2e by Tom McLaughlin at 2026-06-09T15:24:06+05:30 Event/Windows.hsc: rethrow exceptions in overlapped IO This prevents the WinIO manager from swallowing exceptions in overlapped IO. It was added to make WinIO support possible in the `network` library. See https://gitlab.haskell.org/ghc/ghc/-/issues/27283. We also bump __IO_MANAGER_WINIO__ to 2 so libraries can gate on this using CPP. (cherry picked from commit 037a80dc65d3975adf4a35d46876850e644bc80e) - - - - - 42193da3 by sheaf at 2026-06-09T15:24:06+05:30 Avoid mkTick in Core Prep breaking ANF As discovered in #27182, mkTick can break ANF. This patch introduces a variant of mkTick that skips the single optimisation that could break ANF. This is preferrable over switching to the raw Tick constructor, as the latter may introduce spurious cost centres in profiling reports. This is a temporary measure until we more thoroughly refactor how mkTick works (see #27141). See Note [mkTick breaks ANF] in GHC.CoreToStg.Prep. Fixes #27182 (cherry picked from commit f9bcfac2e92457128f5c82dea181edcd0baf7eef) - - - - - 207b6cc6 by mangoiv at 2026-06-09T15:37:22+05:30 Trim the continuation in mkDupableContWithDmds When there are no remaining argument demands, it means the application is bottoming. In this case, we can trim the continuation to avoid the panic that was observed in #27261. See Note [Trimming the continuation for bottoming functions] in GHC.Core.Opt.Simplify.Iteration. This patch was rewritten to avoid pulling in a refactor. The original patch is included in master as 4a645683 (cherry picked from commit 53f74985860b35a879bfd0dc642e7fcafffcf5e4) - - - - - 69561925 by sheaf at 2026-07-20T14:25:36+05:30 Don't drop ticks around variables of type `IO ()` GHC.Core.Utils.mkTick is responsible for placing a tick on a Core expression. It contains logic for dropping SCCs (non-counting profiling ticks) around non-function variables, as such variables cannot meaningfully contribute to profiles. However, the logic for what counts as a function was incorrect: it used `isFunTy` which returns 'False' for types such as 'IO ()' where the function arrow is hidden under a newtype. We now use 'mightBeFunTy' instead of 'isFunTy'. This ensures we don't drop ticks in cases we aren't sure. On the way, we improve the documentation of 'isFunTy', 'isPiTy' and 'mightBeFunTy', and update the latter's implementation to consistently handle unary classes. Fixes #27225 ------------------------- Metric Decrease: T5642 ------------------------- (cherry picked from commit ce01ccb625514a09e76aded549691da4dfe87de7) - - - - - d035085a by sheaf at 2026-07-20T14:25:43+05:30 Fix crash in Data.Data instance for HsCtxt The Data.Data instance for HsCtxt contained an error for the 'toConstr' method, which could trigger for example when looking at -ddump-tc-ast traces. Replace it with the 'abstractConstr' pattern used in the rest of the codebase. (cherry picked from commit 98c20394e8a130df928272c360199fb5e9265f22) - - - - - 4a70cf55 by sheaf at 2026-07-20T14:25:43+05:30 Fix AArch64 clobbering bug for MUL2 On AArch64, the code generator could clobber one of the input operands when computing the lower bits of a MUL2 operation. This rendered invalid the subsequent computation of the high bits. This commit fixes that by using a temporary register. The register allocator can remove the redundant move in the common case when the registers do not conflict. Fixes #27046 (cherry picked from commit c9015f0953e72829e89ac768b6ad9ece34c7e187) - - - - - f17ccdf3 by sheaf at 2026-07-20T14:25:43+05:30 Add type family performance test for #26426 Some GHC versions produced large numbers of coercions after typechecking and desugaring when compiling the program in #26426: Version | Typechecker time | Typechecker allocations | Coercions -------:|-----------------:|------------------------:|---------: 9.6 | 47 ms | 48 MB | 110k 9.8 | 1000 ms | 486 MB | 10,437k 9.10 | 922 ms | 489 MB | 10,436k 9.12 | 906 ms | 482 MB | 10,437k 9.14 | 63 ms | 55 MB | 333k 10.0 | 47 ms | 64 MB | 35k The improvement 9.12 -> 9.14 was due to commit 22d11fa818fae2c95c494fc0fac1f8cb4c6e7cb6, while the improvement 9.14 -> 10.0 was due to commit 0b7df6db9e46df40e86fbff1a66dc10440b99db5. As the behaviour of GHC seems better than it's ever been on this program, we declare victory, adding this performance test to ensure we don't regress on this program. On the way, we update Note [Combining equalities] in GHC.Tc.SolveR.Equality with the explanation of the 9.12 -> 9.14 improvement (getting rid of an exponential blowup in coercion sizes), and we update Note [Exploiting closed type families] in GHC.Tc.Solver.FunDeps with the explanation of the 9.14 -> 10.0 improvement (bringing down coercion size growth from cubic to quadratic). (cherry picked from commit 40764930f10d73f6ca00dfbbce908f9516d262ce) - - - - - eca8e6eb by mangoiv at 2026-07-20T14:25:48+05:30 libraries/process: bump submodule to v1.6.30.0 - bump the submodule to the appropriate tag - suppress benign warning resulting from the change (cherry picked from commit d9ea2d76545452a7df567b162340079cb024a40c) - - - - - 7aba67c2 by ARATA Mizuki at 2026-07-20T14:25:57+05:30 RISC-V NCG: Zero-extend the result of castFloatToWord32 According to the ISA manual, FMV.X.W sign-extends the result. We need to truncate the result to avoid creating an exotic Word32 value. Fixes #27300 (cherry picked from commit 291ce3aafe4ca3d2562154a28c595a858987d9f1) - - - - - 9dba4f96 by ARATA Mizuki at 2026-07-20T14:25:57+05:30 RISC-V NCG: Treat d28-d31 (ft8-ft11) as caller-saved According to the calling convention, the registers d28-d31 (ft8-ft11) are caller-saved. Fixes #27306 (cherry picked from commit 011be91fdaa7869dff2f30b8f2ecca3c9a713739) - - - - - 4e7a3d23 by ARATA Mizuki at 2026-07-20T14:25:57+05:30 RISC-V NCG: Set rounding mode when emitting `truncate` If we omit the rounding mode for `fcvt`, `dyn` will be used. We do not want that for `truncate`, so we set `rtz`. In other places, we set `rne` because we do not use the dynamic rounding mode. Fixes #27303 (cherry picked from commit e8a547133031b7de8f6f9bbd70a7148eda0941ee) - - - - - b9d78ac1 by Zubin Duggal at 2026-07-20T14:25:57+05:30 rts: fix validate build with gcc 16. `__attribute__((regparm(1)))` is ignored on x86_64 and now gcc warns that it is ignored: rts/sm/Evac.h:35:1: error: error: ‘regparm’ attribute ignored [-Werror=attributes] See https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=ccead81bbc39668376eb5cf47066ac... Fixes #27366 (cherry picked from commit 9438bec7117433bbc70449d4288f6ee32dbbbec4) - - - - - dfd1dd1b by Ian Duncan at 2026-07-20T14:25:58+05:30 AArch64: use SXTH, not SXTW, for W32 signExtendReg signExtendReg was using SXTH (sign-extend halfword, 16-bit) for W32-to-W64 sign extension. This should be SXTW (sign-extend word, 32-bit). SXTH only sign-extends the lower 16 bits, producing wrong results for 32-bit values whose bit 15 differs from bit 31. Other fixes: - At sub-W64, code gen for MO_S_Mul2 should use W32 registers for SMULL source operands as per the ARM spec (SMULL Xd, Wn, Wm), and not W64. - Ensure signExtendReg uses the source width for the source operand in SXTW/SXTH/SXTB instructions. GNU as requires sxtw Xd,Wn (not sxtw Xd,Xn), while LLVM's integrated assembler on macOS is lenient. - Fix overflow flag computation for `MO_S_Mul2`. The overflow bit was exactly inverted for sub-W64 operands. Fixes #26978 and #27047 (cherry picked from commit 636c1c7ae47495f022affa501ea0a40cb55cd4a4) - - - - - 36de60c2 by Luite Stegeman at 2026-07-20T14:25:58+05:30 tag inference: don't confuse functions with their return values inferTagRhs was mixing up taggedness for closures and return values for function closures. We really shouldn't assign TagTuple to a properly tagged function returning a tuple. We fix this by keeping track of functions (TagFun) separately from values (TagVal) and keeping track of their return value. TagFun is also used for join points. fixes #27005 (cherry picked from commit 7fe4f2ec3ce12ea138177c81a019dcfc148fe5d4) - - - - - caac944f by Sebastian Graf at 2026-07-20T14:26:25+05:30 Desugar a `case` scrutinee only once (#27383, #20251) In `dsExpr` for `HsCase` we desugared the scrutinee /twice/: once to build the Core `case` itself, and again inside `matchWrapper`, which re-desugared the source scrutinee (via `addHsScrutTmCs`) purely to record long-distance information for the pattern-match checker. For a single `case` that is merely wasteful. But for nested cases it is catastrophic. Consider case (case (case e of ... ) of ... ) of ... Desugaring the outer scrutinee desugars the middle `case` twice, each of which desugars the inner `case` twice, and so on. The work doubles at every level, so desugaring takes O(2^n) time in the nesting depth. That is the blowup reported in #27383; it is also what makes the machine-generated program in #20251 take an age to compile. The fix is simple. `matchWrapper` is handed the scrutinee anyway, so we give it the Core expression we have /already/ desugared, and record the long-distance term constraint with `addCoreScrutTmCs` instead of re-desugaring from source. This is just what `matchSinglePatVar` already does for single-pattern matches. So: * `matchWrapper` now takes `Maybe [CoreExpr]` rather than `Maybe [LHsExpr GhcTc]`. * The `HsCase` equation of `dsExpr` passes the already-desugared `core_discrim`; the arrow desugarer passes its match variables. * `addHsScrutTmCs` had no other use, so it is gone. Desugaring is now linear in the nesting depth. (The coverage checker still runs `simpleOptExpr` over each scrutinee, which leaves the total at O(n^2); that is ample.) The long-distance information itself is unchanged: the checker sees precisely the Core that backs the generated code. Test: deSugar/should_compile/T27383 (cherry picked from commit 67d41299be96798702377e6e2b826f9c8e070821) - - - - - 26c22c6e by sheaf at 2026-07-20T14:26:26+05:30 Avoid mkTick in Core Prep breaking ANF (part II) Hotfix for 2f9579765f55b3920ceb2e04995ff41a9d0e2d4e fixing a small oversight in the call to tickTickedExpr from mkTick, in which we improperly recursively called mkTick without passing on the preserve_anf flag. Fixes #27386 (cherry picked from commit 473b97ebc742305f56e30d5b1bbf95b7681312f0) - - - - - 4872ef31 by Simon Hengel at 2026-07-20T15:39:29+05:30 Reference correct package in error messages for reexported modules (fixes #27417) (cherry picked from commit a805b2a25021606b30d250e084d4beecbfac0d0a) - - - - - 9f158de1 by mangoiv at 2026-07-20T15:39:29+05:30 compiler: rename ZonkAny to UnusedType and add pretty printing logic ZonkAny is a hard to understand name for users who do not know how the compiler works internally. Additionally, it is confusing that ZonkAny, while being a concrete type *represents* a meta variable, espeically in the compiler output. This patch changes the name of ZonkAny to UnusedType which is closer to its intended semantics and adds special pretty printing logic to display this type in the same fashion the compiler displays meta variables in other places, whenever they leak from the implementation to the user. It also exports the type from ghc-internal:GHC.Internal.Types in order to expose documentation. Fixes #27390 Co-Authored-By: Sam Derbyshire <sam.derbyshire@gmail.com> (cherry picked from commit a72ff58fa86172b1557e405f7246d27914fdae6e) - - - - - 7f19139e by Luite Stegeman at 2026-07-20T15:39:29+05:30 rts: handle large AP closures in compacting GC The function update_fwd_large in the compacting GC could run into an unexpected object with the following error: internal error: update_fwd_large: unknown/strange object 24 Closure type 24 is the AP closure, which was not handled in upd_fwd_large. This patch adds handling them. fixes #27434 (cherry picked from commit cca0d58963f802a8b2e43aa2dbc58592f8ad07bb) - - - - - 34a825d4 by Cheng Shao at 2026-07-20T15:39:29+05:30 compiler: fix missing handling of CmmUnsafeForeignCall node in LayoutStack This patch fixes missing handling of `CmmUnsafeForeignCall` middle node in the `LayoutStack` pass. Before proc-points splitting, this pass computes liveliness of local registers, and spills those alive across a Cmm native call onto the stack. It need to traverse all middle nodes in each block and check whether a local register is an assignee, if so then the previous mapping in `sm_regs` is invalidated and needs to be dropped. However, it didn't handle `CmmUnsafeForeignCall` node which may also assign to a local register. When proc-points splitting is enabled, this can produce an invalid basic block that doesn't properly backup the updated local register to the stack before doing a Cmm call, resulting in completely invalid runtime behavior. The patch also adds a `T27447` regression test. With no-TNTC or with LLVM backend, without the fix the test case would output a stale 0x1111111111111111 value, instead of the expected 0x2222222222222222 output. Fixes #27447. Co-authored-by: Codex <codex@openai.com> (cherry picked from commit 3f00f234d0d5b3b3b2a23a5dc70ce372eb9bbdb4) - - - - - 835ed6f2 by mangoiv at 2026-07-20T15:39:29+05:30 ci: retry fetching test metrics Retry fetching test metrics to make the CI not fail if the services is temporarily unavailable (cherry picked from commit b7e24044fde064cb3f0d44c36872a86d024cd7d4) - - - - - 89a634fc by Zubin Duggal at 2026-07-20T15:39:29+05:30 Bump semaphore-compat submodule to 2.0.1 This versions includes some cruicial fixes for darwin (cherry picked from commit 4180af3f71754472dbd49b85179b25fd29bd9998) - - - - - e5b1fab6 by Zubin Duggal at 2026-07-20T15:39:29+05:30 CorePrep: Don't speculatively evaluate bindings that we have already discovered to be absent In #25924, we segfault because speculation forces a projection out of a RUBBISH dictionary (which we generated because it absent). Solution: Don't speculate on bindings we already know are absent. Fixes 25924 (cherry picked from commit 9b714c4c833461c621f0a050680848d7248aa57e) - - - - - ebe99a26 by Zubin Duggal at 2026-07-20T15:39:29+05:30 Don't make absent fillers for terminating types In #25924 we discovered that we could speculatively evaluate an absent filler for a dictionary, and project a field (a superclass selector) out of it, resulting in segfaults. Solution: Never make an absent filler or rubbish literal for a terminating type like a dictionary. mkAbsentFiller returns Nothing for isTerminatingType, so worker/wrapper and the specialiser keep the real argument instead. Some small metric decreases because we do a little less work in the simplifier now. Metric Decrease: T9872a T9872b T9872c TcPlugin_RewritePerf (cherry picked from commit 4a59b3eece9b7106fcbe73d2d06a49755be4ea8f) - - - - - 2d4a6f31 by Andreas Klebinger at 2026-07-20T15:39:29+05:30 Fix a profiling race condition resulting in segfaults. StgToCmm: Don't assume tagged FUN closures in closureCodeBody. When entering a closure the self/node pointer might not be tagged in some situations when a thunk is evaluated by multiple threads. So we most AND away the tag bits rather than subtracting an expected tag. Apply.cmm: Fix a race condition occuring when a thunk is mutated during GC. In stg_ap_0_fast when might need to run GC before entering a thunk. If this happens another thread or the GC itself might mutate the closure making entering it no longer valid. We now check for this. Add test and changelog for #27123 fixes. (cherry picked from commit ed09895d7de1ca116a561868c151fd825a16ad0c) - - - - - 5775b5ca by Cheng Shao at 2026-07-20T15:39:29+05:30 ghc-heap: fix invalid srtlen returned by peekItbl when no-TNTC This patch fixes the no-TNTC code path of `peekItbl` so that it looks at the right memory address when reading the `srt` field from the `StgInfoTable_` struct. Also adds a `T27465` regression test that reproduces the bug on no-TNTC builds before the fix. Fixes #27465. Co-authored-by: Codex <codex@openai.com> (cherry picked from commit 67c03eb2c762fdfeb646eb8345341173dd4268b2) - - - - - cb19b6c5 by Andrea Vezzosi at 2026-07-20T15:39:29+05:30 [Fix #27287] preserve ModBreaks in ModIface (cherry picked from commit 4396a6f2a4c7799908e1e0b88a218a51d063fdca) - - - - - e401ef1c by Zubin Duggal at 2026-07-20T15:39:29+05:30 hadrian: Remove old package.conf files when generating new ones Old package.conf files might exists with different hashes, causing issues like #26661 Fixes #26661 (cherry picked from commit 5ac9ce7d3821c75e2d2cc17fae00b9e865a02987) - - - - - 7f50e6d6 by Cheng Shao at 2026-07-20T15:39:29+05:30 compiler: fix miscompiled %load_relaxed, add missing %store_relaxed This patch fixes the %load_relaxed cmm primop compilation logic to correctly use relaxed memory ordering, and adds the missing %store_relaxed primop. Parsing logic of %load/%store with explicit ordering is covered in the AtomicFetch test case. Fixes #27483. Co-authored-by: Codex <codex@openai.com> (cherry picked from commit eee8ec5b25ef0f83ba4822e7a0a941df7b0bec5f) - - - - - d184ea5d by Cheng Shao at 2026-07-20T15:39:29+05:30 rts: fix missing UNTAG in stg_readTVarIOzh This patch fixes missing UNTAG on the current value closure read from StgTVar. UNTAG is a no-op when it's stg_TREC_HEADER_info which is word aligned; it may be a tagged closure, and reading info table from the tagged address is an unaligned load which may cause issues on platforms with strict alignment requirements. Co-authored-by: Codex <codex@openai.com> (cherry picked from commit d377e83e51d39a06e1f0bf2e35a923a3210b21a2) - - - - - 2036f996 by Cheng Shao at 2026-07-20T15:39:29+05:30 rts: fix missing UNTAG in stg_control0zh_ll This patch fixes missing UNTAG on the cont closure returned by captureContinuationAndAbort. In case it's not NULL, captureContinuationAndAbort returns a tagged StgContinuation closure, in which case it must be untagged before accessing the apply_mask_frame field. In the past it worked out of luck: when apply_mask_frame was NULL then mask_frame_offset is also 0 so the control flow didn't diverge to a wrong path. Still, this is horribly wrong and will crash once StgContinuation struct is refactored and fields are shuffled around. Co-authored-by: Codex <codex@openai.com> (cherry picked from commit 8ed038421a20e3e4e681973b2f5098e5bd2144b5) - - - - - 3b82fd7f by Cheng Shao at 2026-07-20T15:39:29+05:30 compiler: fix redundant AP thunk codegen when not using -ticky-ap-thunk This patch fixes a double negation confusion in !7525 that results in some redundant AP thunk code generation when not using -ticky-ap-thunk. Now, we use `stgToCmmUseStdApThunk` to indicate whether precomputed AP thunks in the RTS should be used, which defaults to `True`, unless `-ticky-ap-thunk` is passed. `-finfo-table-map` now also implies `-ticky-ap-thunk`, since when doing IPE profiling we want the generated AP thunks to be unique. Fixes #27502. ------------------------- Metric Decrease: T3064 ------------------------- Co-authored-by: Codex <codex@openai.com> (cherry picked from commit 5aa7000ae246ae6a706437799338295b5801a629) - - - - - c25a2d92 by Brian McKenna at 2026-07-20T15:39:29+05:30 Strip ticks when desugaring bool guards The special `considerAccessible` pattern was broken when compiling with debug info. Compiling with debug info wraps expressions with `SourceNote` ticks, which broke the internals of the `desugarBoolGuard` function. Ticks are now ignored within this function. Fixes #27360 (cherry picked from commit d43a7b7ad90047f1445c88d796ee7b15a0a605d7) - - - - - 42778740 by Ben Gamari at 2026-07-20T15:39:29+05:30 base: Display ExceptionContext in WhileHandling's textual description As originally-implemented the implementation for `WhileHandling(displayExceptionAnnotation)` would display the `ExceptionContext` of the exception which it carries (as this was the behavior of `displayException`, in terms of which `displayExceptionAnnotation` was implemented). However, in 284ffab3 the definition of `SomeException(displayException)` was changed to exclude the `ExceptionContext`. This means that `WhileHandling(displayExceptionAnnotation)` fails to describe the provenance of the exception which it captures, greatly limiting its utility. Return the implementation to its originally-specified behavior by implementing `WhileHandling(displayExceptionAnnotation)` in terms of `displayExceptionWithInfo`. Fixes #27456. (cherry picked from commit ede4b17bdc54c055e44ad95711409c7d1dcb1128) - - - - - cd1fdc26 by Brian McKenna at 2026-07-20T15:39:29+05:30 Ignore ticks in the pattern-match term oracle The term-oracle in the pattern-match checker is keyed by a canonical form of the scrutinee, computed by `makeDictsCoherent`. That canonical form was tick-sensitive: two occurrences of an otherwise identical expression that happened to carry different ticks were treated as distinct values, breaking long-distance information. This shows up in practice under `-finfo-table-map`, because the desugarer wraps every record-selector use site in a `SourceNote` carrying that site's span. For example: data Box = Box { unBox :: Maybe Int } f b = case unBox b of Nothing -> 0 Just _ -> let Just x = unBox b in x The two `unBox b` expressionss carry different SourceNote spans, the pattern-match checker sees them as different, the long-distance information from the outer `Just _` branch never reaches the let-pattern, and `Just x = unBox b` is wrongly reported as non-exhaustive. We now strip all ticks in `makeDictsCoherent`. This is documented as Wrinkle (UD1) of Note [Unique dictionaries in the TmOracle CoreMap]. Fixes #27314 (cherry picked from commit b388d0934c0933c1cdb47226489634e229239d0a) - - - - - 2a27443f by Duncan Coutts at 2026-07-20T15:39:29+05:30 Fix failing test GcStaticPointers for non-moving GC Minor mistake in asserting something before checking for that same thing. Specifically, Bdescr asserts HEAP_ALLOCED_GC, but Bdescr was being used prior to a guard that checks HEAP_ALLOCED_GC. The solution is just to move the use of Bdescr after the guard. Thanks to Simon Jakobi for identifying the problem. (cherry picked from commit 42918646169c7c5ba61912b39b5f5147bf1d255c) - - - - - b11f2da2 by Zubin Duggal at 2026-09-03T13:18:46+05:30 Bump Cabal submodule to 3.18.1.0 - - - - - ad7709f1 by Cheng Shao at 2026-09-03T13:18:46+05:30 rts: always use StgInt to represent cost center id Currently cost center id is modeled as `Int` and it should be `StgInt` uniformly in the RTS, hence this patch. Fixes #27524. (cherry picked from commit ab9ab8952b1ff20ed8b092ff95d6a9f8d822c033) - - - - - 788db729 by Zubin Duggal at 2026-09-17T09:02:48+05:30 UniqueDFM: alter should preserve insertion order Before it always inserting new elements at the end. This is problematic because instances get inserted into the map with `alterF`, which can change ordering of how instances are printed with `:info` depending on the order in which we consult interfaces I expect `alter id k = id` and `alter (fmap f) k = adjust f k`. Moving keys to the end breaks that (`adjust` already preserves position). Fixes #27532 (cherry picked from commit f6f2343fbbfdfd8aaed9babf5983e3e24c08ca85) - - - - - 4fa83928 by Duncan Coutts at 2026-09-17T09:02:48+05:30 Add missing updateRemembSetPushClosure in poll I/O manager For the non-moving GC. (cherry picked from commit daf2bd6f71b7ee309374dddf0d4793bbc0ed066d) - - - - - 473ef734 by Duncan Coutts at 2026-09-17T09:02:49+05:30 Eliminate STM_AWOKEN It was used as nullary closure for the block_info.closure in the case of a thread being awoken after an STM transaction. However, while it was written, it was never read, so contributed nothing to the behaviour. Furthermore, in the only place it was set (in tryWakeupThread) the why_blocked was immediately overwritten by the NotBlocked status, and the block_info was updated accordingly (by appendToRunQueue). So it didn't even serve a purpose of clarifying an intermediate state, there really was no such intermediate state. Cleaning this up will allow the BlockedOnSTM case to follow the same pattern as the other why_blocked cases that do not use the block_info, and in turn this reduces the number of different categories. (cherry picked from commit 4d798b17c9b83f280c102ca7f96047bc0ad52df1) - - - - - 17a159f5 by Duncan Coutts at 2026-09-17T09:02:49+05:30 Document that eventlog thread stop code ThreadBlocked is no longer used It has not been used since GHC 7.0.x (2011). In 7.2 all the BlockedOn* codes were added, and these were and are used instead of ThreadBlocked. (cherry picked from commit e1cece79a6c8e53796188acd543a8b565b18a3fb) - - - - - fd2b37f7 by Duncan Coutts at 2026-09-17T09:02:49+05:30 Add a proper mapping to eventlog external thread stop status That is the mapping from rts-internal codes, to the coes used in the status field in the eventlog EVENT_STOP_THREAD event. See issue #9003 for what goes wrong when we mess this up. In that ticket, people note that we should really not require the internal tso->why_blocked codes to leak into the external eventlog thread stop codes. The same principle applies to the StgThreadReturnCode. This change properly separates them, and explicitly maps between them using a pair of (compact, constant) tables. These tables are pretty small (with no alignment constraints) and will soon shrink so it seems a sensible tradeoff. We also introduce and use proper EVENT_STOP_THREAD constants in the event log format header. Previously there was not specification in the code for these (only in the docs): the values were encoded into the conversion code. This will allow us to renumber the internal why_blockd codes without breaking the eventlog output. (cherry picked from commit 795db1151237be5a3d0d2cdccb4c43309b587cdf) - - - - - bfae7bcb by Duncan Coutts at 2026-09-17T09:02:49+05:30 Remove unused tso->block_info.wakeup member Presumably it was used once, but not now. (cherry picked from commit 6f1c8efa1b4c78273daca99f9dda0a7e3d771330) - - - - - 748787a0 by Duncan Coutts at 2026-09-17T09:02:49+05:30 Document StgTSOBlockInfo to say what cases use what members In principle, tso->why_blocked is the tag for the StgTSOBlockInfo union, so we should be able to say for each union member the why_blocked cases that use that member. (cherry picked from commit 740b88a980c4aa7f28fcf3aa89f7df8aea2813a9) - - - - - b72423b4 by Duncan Coutts at 2026-09-17T09:02:49+05:30 Add a tso->block_info.mvar member and use it in preference to the generic block_info.closure union member, with casts. The plan is that when we know what case we're in (via tso->why_blocked) then we can always access the correct union member, and so we will only need to access block_info.closure for generic cases where we don't know or don't care. (cherry picked from commit 5b92eae2638db71ff8725295ec2a8ca254c0720b) - - - - - 292854db by Duncan Coutts at 2026-09-17T09:02:49+05:30 Add a tso->block_info.unused member and use it in preference to the generic block_info.closure union member, with casts. The plan is that when we know what case we're in (via tso->why_blocked) then we can always access the correct union member, and so we will only need to access block_info.closure for generic cases where we don't know or don't care. (cherry picked from commit d931715fbea83ccd402d280965a5d096a9f72949) - - - - - bf5e992d by Duncan Coutts at 2026-09-17T09:02:49+05:30 Avoid storing to tso->block_info.closure In one case we can use a specific union member (.prev) instead. In several cases the stores were in fact redundant because of subsequent overwrites. In scavengeTSO we replace setting tso->block_info.closure to a valid closure, with an assertion that the block_info.unused is already set to END_TSO_QUEUE which is a valid (static) closure. (cherry picked from commit 47e28ebbb4e22ad2ddb27c3f4acc5df291276743) - - - - - 43d2d9ba by Duncan Coutts at 2026-09-17T09:02:49+05:30 Renumber the tso->why_blocked constants We can do this now because we have separated the internal values from the external ones used in the eventlog. This lets us put them back into a deliberate order and consolodate some gaps. More importantly, it is a prepation for a slightly more sophisticated encoding. (cherry picked from commit 96e4749d9f9b75e99d7b860325b92a5b3704e784) - - - - - 72a91c29 by Duncan Coutts at 2026-09-17T09:02:49+05:30 Define constants for the existing stg_threadStatuszh return codes The stg_threadStatuszh reuses the internal tso->why_blocked codes but also extends them with a couple previously magic values. This is awkward since we need to know what those magic values are so we don't accidentally use those values to mean something else. By pulling a definition up to where the why_blocked codes are defined we will be able to avoid mistakenly assining those codes some meaning (or just changing the BlockedThreadComplete, BlockedThreadKilled code if necessary). (cherry picked from commit 8f62661c133338100803347084de3566e325e64c) - - - - - e115197a by Duncan Coutts at 2026-09-17T09:02:49+05:30 Extend the tso->why_blocked encoding to indicate block_info closures We use some bit tricks to cheaply and generically test if a tso->why_blocked tag implies that the corresponding tso->block_info will contain a non-trivial valid closure (i.e. not just block_info.unused set to END_TSO_QUEUE). In particular we arrange for most why_blocked values to naturally have a distinguishing bit, but for the BlockedOn{Read,Write,Delay} cases, they can come in either non-closure or closure forms. We allow an additional bit to distinguish these cases. The non-closure forms are only from legacy I/O managers: select and win32-legacy. So this extra bit mechanism will be able to be retired once the legacy I/O managers are themselves retired. This means in a few places we need to untag the why_blocked value before inspecting it, but in most places we do not. (cherry picked from commit 42c69ae2d58310c703abaa4ec933973fa9b136d3) - - - - - 7fadb90e by Duncan Coutts at 2026-09-17T09:02:49+05:30 Use BlockInfoForceNonClosure in the select I/O manager (cherry picked from commit 7c64632b46ac660fc0779ae96d9a05d11537b743) - - - - - b0fa2586 by Duncan Coutts at 2026-09-17T09:02:49+05:30 Use BlockInfoForceNonClosure in the win32-legacy I/O manager for the BlockedOn{Read,Write} since these use the non-heap allocated StgAsyncIOResult. (cherry picked from commit 8fd7104a0d63208f8408a7e5cd185bd2020225c8) - - - - - 63719c78 by Duncan Coutts at 2026-09-17T09:02:49+05:30 Enforce the why_blocked and block_info rules in checkTSO We now check the cases wher IsBlockInfoClosure should hold, the cases that are supposed to use block_info.unused == END_TSO_QUEUE, and which cases are allowed to use BlockInfoForceNonClosure. This partially enforces the use of why_blocked as a tag for the block_info union. We could be stricter and check for the correct expected info table for the closure cases. (cherry picked from commit e0da603b8e24cfc633f29990be9ca7008f45b3c2) - - - - - 89c5c2c4 by Duncan Coutts at 2026-09-17T09:02:49+05:30 Use IsBlockInfoClosure to simplify several tests In GC and generic traversal we need to know if we should look at the block_info.closure or not. Now we can do just that using a cheap bit test on the why_blocked tag. This fixes issue 26717, where the problem was that some GC modes did not know when to look at block_info.closure, because the poll I/O manager uses a closure for BlockedOn{Read,Write} while the select I/O manager uses a non-closure. Now this information is in the why_blocked tag itself. (cherry picked from commit 1dd0f381ab96d3f46e113c90858870e95bd3caba) - - - - - d0dcbcb1 by Duncan Coutts at 2026-09-17T09:02:49+05:30 Remove the now-unused scavengeTSOIOManager The GC no longer has to delegate to the I/O manager, since it can use IsBlockInfoClosure to decide things itself. (cherry picked from commit 7a00ffbc311e6ee53e8b1b9181e37c3795a7b884) - - - - - 957323b8 by Duncan Coutts at 2026-09-17T09:02:49+05:30 Remove duplicate assertion (cherry picked from commit 522a481f5f1e51a8bdd0902012bdc467535a0382) - - - - - b72b12eb by Duncan Coutts at 2026-09-17T09:02:49+05:30 Follow atomic access rules more consistently for tso->why_blocked The rule is this: store block_info *before* why_blocked store why_blocked using store release load why_blocked using load acquire load block_info *after* why_blocked This is a an atomic store release / load acquire pair and (if the reads are in a separate thread to the writes, and the read receives the value stored) then this guarantees a full "happens before" relationship of these stores and loads. In some cases, we do not need a full load acquire, because we don't read the block_info at all and so do not need any ordering. In this case we just need an atomic relaxed load. This was being followed in most places, but not all. If there's good reason in any case that we don't need atomic access, then we should document that in a comment. In the absence of that I think it's easier to follow the rule everywhere. (cherry picked from commit 0874d965ef1fec847561418857e63c067b91b0b7) - - - - - f0463927 by Duncan Coutts at 2026-09-17T09:02:49+05:30 Add a changelog entry (cherry picked from commit 8f0bdbe138a2e1914cba7963b6931402f99c8710) - - - - - b85c4764 by Cheng Shao at 2026-09-17T09:02:49+05:30 configure: bump LlvmMaxVersion to 23 This patch bumps `LlvmMaxVersion` to 23 to support LLVM 22.x releases. (cherry picked from commit cc9cc6d5df7fb3845b1409fe708e1097896252a7) - - - - - a4a3bcef by Cheng Shao at 2026-09-17T09:02:49+05:30 changelog: add llvm 22.x support (cherry picked from commit 2ea7ef8ef090fa44a0191271f644a0917908ef40) - - - - - 3075450b by fendor at 2026-09-17T09:02:49+05:30 Drop `preloadClosure` from `UnitState` It is always hard-coded to the same value. Backpack Unit instantiation isn't using it any more. Allows us to simplify the API and get rid of `improveUnit`. (cherry picked from commit fb5246adb7e10bd9ef07de314eaf98fbcfb729a1) - - - - - 9105d7a3 by fendor at 2026-09-17T09:02:49+05:30 Introduce global unit database cache As a first step for better sharing of `UnitInfo` across `UnitEnv`, we introduce a new datatype called `ExternalUnitDatabases`. It primarily serves as an in-memory representation of *all* `UnitDatabase`s across `UnitEnv`. This means, if multiple `HomeUnitEnv`s depend on the same database, one way or another, we make sure that we don't parse from disk every time. Instead, we store the in-memory representation in `ExternalUnitDatabases`. `ExternalUnitDatabaseCache` is the equivalent of `ExternalUnitState` in the `UnitEnv`. It is a mutable variable wrapping `ExternalUnitDatabases`. The mutable `ExternalUnitDatabaseCache` is used in `initUnits` to make sure we don't parse the same unit database multiple times. Almost by accident, we change the semantics of `initUnits` to honour modifications to `packageDBFlags`. The inability to change `packageDBFlags` while also reusing the already parsed `UnitDatabase`s was reported in #26423 as a bug. Hence, we think this behaviour change is warranted and acceptable, especially since it comes with a breaking change to the `initUnits` API. Add regression test for #26423 Closes #26423 (cherry picked from commit 5d0ab71ac1d01c2ef19bf3146adb7dac8733dca5) - - - - - 646edcdc by fendor at 2026-09-17T09:02:49+05:30 Introduce UnitIndex for global external unit caching `UnitInfo`s have been observed to cause a lot of memory usage in #27500. Especially with multiple home units, as the same (external) units are processed from scratch, even though most of the time we end up with exactly the same `UnitInfo`. We introduce a `UnitEnv` global cache that allows us to store external unit information that is used across all `HomeUnitEnv`s. The most important change in this commit is the introduction of the `UnitIndex`. It stores a global mapping of `UnitId` -> `UnitInfo`, and `initUnits` always uses the cached `UnitInfo` entry to populate each `HomeUnitEnv`'s `UnitState`. This allows us to ensure the following property:

Each `UnitInfo` should be alive exactly once in GHC.

All `UnitState`s should reference 'UnitInfo's stored in the 'UnitIndex'. This ensured by calling 'initUnits' with the 'UnitIndex'. In addition, the `ExternalUnitDatabases` may also hold a reference to each on-disk representation of `UnitInfo`. This means, we impose an hard upper bound on the number of `UnitInfo`s alive in the GHC session:

The number of alive `UnitInfo`s closure objects must be the sum of all loaded unit database times two.

We add performance regression tests that make sure the number of live `UnitInfo` cannot exceed this threshold. Closes #27500 ------------------------- Metric Decrease: MultiComponentModules MultiComponentModulesRecomp MultiComponentModulesRecomp100 mhu-perf LinkableUsage02 ------------------------- These metrics increases are especially notable, as we are not even sharing anything big but merely the global package database with 50 entries. It shows how careful sharing of `UnitInfo` can improve memory usage. We expect this to be much more notable when the whole cabal package database is shared across multiple home units. `LinkableUsage02` metric decreases on unreg and i386 platform, only. --- Technical details To share the `UnitInfo`s correctly, it is important that we extract the `WireMap` into the `UnitIndex`. At the moment of writing, `WireMap` must be globally the same for all `HomeUnitEnv`s. This is important, as we could otherwise not cache the "fully-resolved" `UnitInfo`, as we don't change the `UnitId` or `unitAbiHash` when resolving wired-in units. Thus, there could be ambiguities, when the `WireMap` is not the same for all `UnitState`s across the `UnitEnv`. We consider a `UnitInfo` fully-resolved, if wired-in units have been updated, the `UnitInfo` has been validated and variables in the unit config, such as `${pkgroot}` have been resolved. Updating the wired-in units requires the `WireMap` to be globally the same. (cherry picked from commit 6cce494a7ec43953c7a949e0d8ce712abfe73da7) - - - - - 9ec6b23a by Ben Gamari at 2026-09-17T09:02:49+05:30 base: Don't drop exception context in SomeException(toException) For reasons that are lost to time, the implementation of [CLC #200] that was merged inappropriately dropped `ExceptionContext` in the `toException` implementation given to `SomeException`. Fix this infelicity. [CLC #200]: https://github.com/haskell/core-libraries-committee/issues/200 (cherry picked from commit 2ab02c579a9625438f5281a258051cb32ba40004) - - - - - 7859bdcd by Vladislav Zavialov at 2026-09-17T09:02:49+05:30 Discard type arguments in tcPatToExpr (#27440, #27583) The builder expression of an implicitly bidirectional pattern synonym must not mention types written in the RHS: * Invisible type arguments led to a panic (#27440) * Required type arguments failed with out-of-scope variables (#27583) Both are now discarded, following the precedent established by pattern signatures (#9867). Discarding type arguments takes some care: a type pattern cannot be told from a value pattern by syntax alone, as the `type` keyword may be omitted. Consider: data T a b c where MkT :: forall a. forall b c -> a -> T a b c pattern P :: x -> T x y z pattern P x = MkT @a (type b) c x In P's right-hand side, `@a` and `type b` are clearly type arguments, but what about `c` and `x`? We can only tell by matching the patterns against MkT's type. So tcPatToExpr now runs in TcM and matches the arguments against the constructor's TyVarBinders using zipPatsBndrs, which is made public for this purpose. The resulting builder is $bP x = MkT _ _ x. See Note [Discarding types in the builder expression]. Test cases: T27440a T27440b T27440c T27440d T27440e T27583a T27583b T27583c T27583d T27583e T27583f T27583g Metric Increase: LinkableUsage02 Metric Decrease: T27336 Assisted-by: Claude Opus 5 (cherry picked from commit 4f98510802423dcd98fa62af77997189ee97a111) - - - - - 84d5e28b by sheaf at 2026-09-17T09:02:49+05:30 mkWpFun_FRR: fix ordering of coercion composition When the subsumption machinery generates an eta-expansion, we must perform a representation polymorphism check to ensure the lambda binder it introduces has a fixed runtime representation. This is done in GHC.Tc.Utils.mkWpFun_FRR. This check involves composing quite a few coercions, arising from representation-polymorphism checks on both the actual and expected argument types. These coercions are then chained using HsWrapper composition, <.>. The ordering of composition was incorrect, leading to the Core Lint failure reported in #27639. This commit fixes that. Fixes #27639 (cherry picked from commit eb1dcd4d98548b7bc64c323dc352ddbf149a91ec) - - - - - ac69ec91 by Bernhard M. Wiedemann at 2026-09-17T09:02:49+05:30 driver: Link object files in a deterministic order The object files handed to the linker come from the HomePackageTable, which is ordered by the order in which modules finished compiling. With -j1 that is the build plan order, with -jN it is whatever the scheduler produced, so the same sources can link to different (but equivalent) binaries. The order reaches the output: .text and .rodata contributions are concatenated in link order, so e.g. building the hdav executable of the DAV package twice, once with -j1 and once with -j4, yields two binaries that differ in ~100kB of section contents. Sort the home modules by module before collecting their linkables, guarded under `Opt_ObjectDeterminism` . Fixes #27612 Signed-off-by: Bernhard M. Wiedemann <bwiedemann@suse.de> (cherry picked from commit e8d1a0d68067ba344fdff816f6b84f0117ffdc59) - - - - - e13f60c4 by Zubin Duggal at 2026-09-17T09:02:49+05:30 hadrian: Fix links to remaining doc sites to not use the package hash for haddock links In 07267f79d91169f474cacc8bcd38d76a6e97887d we changed hadrian to not include the package hash in the haddock directory. This patch takes care of a few remaining links that were missed in that patch Fixes #27671 (cherry picked from commit 1446bb039a635f2b836be19f062cbffa568fe4c5) - - - - - 14900e9f by Vladislav Zavialov at 2026-09-17T09:02:49+05:30 Fix tcLookupId panic with RequiredTypeArguments and PatternSynonyms (#27586) The arguments declared on the left-hand side of a pattern synonym are looked up as term variables bound by its right-hand side. Prior to this patch, that lookup panicked with RequiredTypeArguments: data T a where MkT :: forall a -> T a pattern P :: Int -> T Int pattern P x = MkT x On the RHS, `x` looks like a term argument, so the renamer binds it in the term namespace. Only during type checking does it turn out to be a type variable, so the lookup on the LHS finds an ATyVar rather than an ATcId. As the lookup was done with tcLookupId, it resulted in a panic. Now the arguments are looked up with tcLookupPatSynArg, which reports an illegal term-level use of `x`, just as an ordinary function definition `f (MkT x) = x` does. Test cases: T27586a T27586b T27586c Assisted-by: Claude Opus 5 (cherry picked from commit b757727a78613e7437a713058c24b94e10697f47) - - - - - a7c35503 by Zubin Duggal at 2026-09-17T09:02:49+05:30 DmdAnal: Fix maxDmdType We need to eta expand the smaller DmdType using defaultArgDmd, like in lubDmdType. Introduce zipDmdType as a common combinator to implement both maxDmdType and lubDmdType uniformly. fixes #27626 (cherry picked from commit e31885816b7c597ad89b05da64b21c5a241bf674) - - - - - fb1aeab3 by Andreas Klebinger at 2026-09-17T09:02:49+05:30 cmm dumps: Add machop width info with -dppr-debug for infix ops. (cherry picked from commit e9bbe8f924ec0b9d0772cf3d4f20aa6a25f28345) - - - - - 8f6ae648 by Andreas Klebinger at 2026-09-17T09:02:49+05:30 CmmLint: Check for unsupported MachOp widths machOpArgReps now maps MachOp + Width to a list of supported argument widths or Nothing if the given operation is not supported at the given width. This allows us to check for nonsensical combinations like FloatToInt at Word16. Similarly we now check that every address is actually wordwidth. (cherry picked from commit 86e3a9d8d0a85b5c80dad212cf3ec8fbf1ba72e6) - - - - - e4e585f7 by Andreas Klebinger at 2026-09-17T09:02:49+05:30 arm64 ncg: The big subword truncation fix. A set of slightly related fixes to arm subword handling: Bitmask immediates: Don't produce overflowing assembly literals. There is still another bug here that causes us to miss some valid literals but we will fix that later. Improve subword truncation handling: We now use a small set of helpers to truncate `Register` values rather than truncating immediate `Reg` values which greatly simplifies the code structure. This fixes a great many bugs to do with sign/zero extending subwords or the lack thereof. We now establish the invariant that subword values are zero-extended at every site at which they come into "scope" of the ncg, and rely on the invariant throughout rather than pessimistically inserting redundant extensions in a hodgepodge manner at the use sites of these values. This fixes at least the bugs described in issues #27533, #27430 #27537, #27538, #27539, and #27550. But likely more bugs yet not found. Subword ffi results: Apply truncations when calling functions returning subword values. genCondJump: Don't sign extend signed values in the input register as it might map to a local variable, corrupting the value stored within. Fix subword store/load instructions.: We used to read those at 32bit width even for smaller values possibly resulting in invalid memory access. Now we construct the suffix for subword variants based on the instruction format for these. (cherry picked from commit 13781cca5c24c2671d651fd2b13a561c7386fe3a) - - - - - 153f023e by Andreas Klebinger at 2026-09-17T09:02:49+05:30 arm64 ncg: Fix MO_V_Broadcast for non-literals. We now use OpReg instead of OpScalarAsVec as required since we broadcast a gp register. Also adds a test. Fixes #27565. (cherry picked from commit d8fa5d7cc060aa7d3bee8a68b922c85b626cbe8c) - - - - - d7acdc00 by Andreas Klebinger at 2026-09-17T09:02:49+05:30 Add some test cases covering bugs in the arm ncg. * Test for #27430 (subword ffi results) * #27537 - subword conversions * #27538 - subwords used in conditional * #27533 - single byte read (cherry picked from commit 94822c951c2a6f77c7766720e0d4ff7d4afb7290) - - - - - 13b6c88c by Andreas Klebinger at 2026-09-17T09:02:50+05:30 cmmLint: Lint against MO_FS_Truncate subword use. (cherry picked from commit dd1ba88a70f47bead722e9dae8e91f9a617258aa) - - - - - e4f6f9cb by Rodrigo Mesquita at 2026-09-17T09:02:50+05:30 rts: refactor to reduce THREADED_RTS in MSG_UPD_TSO_FLAGS - No behavior change in this commit (well, a small optimization here makes us do less work if the target TSO owned by the curr. capability) - Move all THREADED_RTS CPP needed into `updThreadFlag` - Merge MSG_SET_TSO_FLAGS and MSG_UNSET_TSO_FLAGS into MSG_UPD_TSO_FLAGS plus a `set` bool field in the MessageUpdTSOFlag struct Towards #27729 (cherry picked from commit bb3241717c8ee46e31fbdb3cfaed9736ba7257ea) - - - - - c526947c by Rodrigo Mesquita at 2026-09-17T09:02:50+05:30 rts: Fix race condition in MSG_UPD_TSO_FLAGS execution The code for processing the MSG_UPD_TSO_FLAGS message was not taking into consideration that the TSO's owner might have moved in between that capability receiving the message (since it was its previous owner) and starting to process its inbox (a point at which it was no longer the owner) Added Note [TSO owner may change in between Msg being sent and received] to explain this race and the pattern used to fix this, where we just forward the message to the new owner. Fixes #27729 (cherry picked from commit ed99b7b7bed699f3f2047672be7709c6d22b6df7) - - - - - d599d99e by fendor at 2026-09-17T09:02:50+05:30 GHCi: Fix order of `PackageDBFlag`s for interactive home unit `PackageDBFlag`s are stored in reverse order of cli specification. When sorting the `PackageDBFlag`s by longest common prefix, we need thus to reverse the package db stacks before calculating the prefix. We make sure to reverse the package db stack for the interactive home unit to uphold that later specified package dbs overwrite earlier ones. Resolved and adds regression test for #27640 (cherry picked from commit 06fde293f2e8c80db11f4d01fcdfc482c1128db5) - - - - - 955ae4a1 by fendor at 2026-09-17T09:02:50+05:30 Reuse the UnitIndexCache after initialising multiple home units (cherry picked from commit 024c4d04a98f7e27b3dcb93f9b038f9b6b5a1ad9) - - - - - a90b21f8 by Andreas Klebinger at 2026-09-17T09:02:50+05:30 Specialise: Stop looping on recursive dictionaries in interestingDict interestingDict now doesn't look through loopbreaker unfoldings. Doing so would cause infinite loops on certain dictionaries. Fixes #27705. (cherry picked from commit 578bd18509f0d2aeb004231a197f7f3898f86a2a) - - - - - 250dd898 by Simon Peyton Jones at 2026-09-17T09:02:50+05:30 Never make an absent filler for a constraint type mkAbsentFiller used isTerminatingType to decide, but that is not enough. Consider class Eq a => UC a where {} let u :: UC Int -- UC Int is a "non-terminating type" u = error "Absent" let e :: Eq Int -- Eq Int is a "terminating type" e = $p1UC u We clearly must not make a filler for `e`, because we speculatively evaluate it. But speculatively evaluating `e` forces `u`, so we must not make one for `u` either. Asking isDictTy instead is not enough either, because it does not catch a constraint hidden behind an unreduced type family application: type family F a :: Constraint type instance F W = TC W a :: F W => Int -> Int -- (F W) argument is absent Oops! Entered absent arg Arg: irred Type: F W So play safe and use isPredTy: never make an absent filler for any constraint-kinded type. Fixes #27627 (cherry picked from commit 7bf546fc423e23cb649580016ee494efbfe144ab) - - - - - 152a71f6 by Zubin Duggal at 2026-09-17T09:02:50+05:30 Add tests for absent fillers at dictionary types T27627 a unary class whose superclass is a non-unary class T27627a ...whose superclass is a Constraint-kinded type family T27627b ...whose superclass is a quantified constraint T27627c a unary class applied to itself, (UC (UC (TC a))) T27627e a (forall b. P b) dictionary that loops (cherry picked from commit 5f474953d1880232b5e6c5741f08746e28cd25ab) - - - - - 509df6af by Zubin Duggal at 2026-09-17T09:02:50+05:30 An abstract TyCon may hide a unary class A class declared in an hs-boot file is an AbstractTyCon inside the module loop, and compiling the real declaration may reveal it to be a UnaryClassTyCon. - isTerminatingType returned True for such AbstractTyCons - IfaceToCore set the unary flag to False in the DFunId So we could end up speculating bottom dictionaries because inside a module loop we see an UnaryClassTyCon as an AbstractTyCon Use isTerminatingTyCon, which returns False for an abstract TyCon. The Bool in DFunId is now a cache for isTerminatingTyCon, set in mkDFunIdDetails. Fixes #27704 (cherry picked from commit cd5c6bcc0a59c7b4dc4627fdc7471dc7938d07c2) - - - - - 291dcd74 by Zubin Duggal at 2026-09-17T09:02:50+05:30 Specialise: don't replace dead args with absent fillers specHeader decides an argument is dead by calling isDeadBinder on a binder of the /optimised RHS/, then applies the filler to the /stable unfolding/ template instead. The two may differ, so the argument can be dead in the RHS and not in the template. The specialised function's unfolding then has an absent filler, and any call site that inlines it evaluates the error thunk. Dropping dead args in the specialiser is rarely worth it, to quote Simon, "The later worker/wrapper pass will pick up the dead arg later if it is really dead. Keeps the specialiser simpler." So instead of trying to check if the arg really is dead in the stable unfolding, just drop the logic for dropping dead args in the specialiser altogeher. Fixes #27703 (cherry picked from commit abfc224a27cf499390efc5fe1348301fefebb910) - - - - - e6e22c42 by Zubin Duggal at 2026-09-17T09:02:50+05:30 CorePrep: don't speculate a call across an hs-boot edge We take care not to evaluate things that might be bottom, like a looping dictionary group, but our analysis is defeated by boot files. We only track recursion within a module, so two dictionaries that depend on each other across a module loop each look non-recursive, and we might speculate them. Any recursion we cannot see must cross an hs-boot edge, so refuse to speculate calls that cross one. Fixes #27717 (cherry picked from commit 1557fd1cfb802d2608cb5b138eab664564f57fb7) - - - - - 2f07f9dd by Cheng Shao at 2026-09-17T09:02:50+05:30 autoconf/ghc-toolchain: bump llvm upper bound to support llvm 23 This commit bumps llvm upper bound to support llvm 23. (cherry picked from commit 56291fc550ec00784e46ec0c89ee65081090ae9f) - - - - - 9e54991a by Cheng Shao at 2026-09-17T09:02:50+05:30 rts: fix compilation issues with clang 23 clang 23 has broadened `-Wall`/`-Wextra` ranges, exposing some minor issues in the rts when building with validate flavours: - Unused locals - `#pragma GCC diagnostic pop` mismatch This commit fixes those. (cherry picked from commit 20eb3f415f9e04a003322d1a49d95e0aaf1029f2) - - - - - 28c13a88 by Zubin Duggal at 2026-09-17T09:02:50+05:30 Bump directory submodule to 1.3.11.0 - - - - - 2ca75d81 by Zubin Duggal at 2026-09-17T09:02:50+05:30 Bump os-string submodule to 2.0.11 - - - - - 16010d1b by Zubin Duggal at 2026-09-17T09:02:50+05:30 Bump filepath submodule to 1.5.5.0 - - - - - 4d78a8e6 by Zubin Duggal at 2026-09-17T09:02:50+05:30 Bump haskeline submodule to 0.8.5.0 - - - - - 1f772d76 by Zubin Duggal at 2026-09-17T09:02:50+05:30 Bump xhtml submodule to 3000.4.1.0 - - - - - 7b14677d by Zubin Duggal at 2026-09-17T09:02:50+05:30 Bump Win32 submodule to 2.14.2.2 - - - - - 08f0356f by Zubin Duggal at 2026-09-17T09:02:50+05:30 Bump time submodule to 1.16.0.1 - - - - - 9d8ee9ff by Simon Peyton Jones at 2026-09-17T09:02:50+05:30 Move HsStatic free-var test to typechecker A `static` form should have no free *term* variables, but it can have free *type* variables. Alas, the renamer does not really know what is a term variable and what is a type variable, because of required type arguments. This patch moves the test to the typechecker, which does know. Addresses #27664 (cherry picked from commit c673ecf057deee858acbbaa7e6c92078a818d6f2) - - - - - 118aa488 by sheaf at 2026-09-17T09:02:50+05:30 Preserve tick ordering in 'tickTickedExpr' 'GHC.Core.Utils.tickTickedExpr' tries to combine a tick 't1' into an existing stack of ticks 't2s'. There are two situations: 1. 't1' is subsumed by a tick in 't2s': drop it. 2. A tick in 't2s' is subsumed by 't1', say 't2'. This commit ensures that in case (2) we keep 't1' on the outside instead of replacing 't2' at its position in the stack. This avoids re-ordering source notes (which was the cause of #27749). This fixes a regression introduced in 2dadf3b0d05. Fixes #27749 (cherry picked from commit e28313e31a5acfa5c5b622ef0d02acc8f3d68934) - - - - - f02233bc by sheaf at 2026-09-17T09:02:51+05:30 Consistently prefer local source note ticks GHC.Cmm.DebugBlock.cmmDebugGen (DWARF annotations) and GHC.Stg.Debug.quickSourcePos (-finfo-table-map) both contained logic to prioritise source note ticks from the current module. This commit commons up this logic and propagates it to a third consumer: IPE stack frames, in GHC.Driver.GenerateCgIPEStub. See the new function GHC.Types.Tickish.bestSourceNote. (cherry picked from commit 3172f557f9bbd5aa01b7ca6368f8abd670a58066) - - - - - 0e89835e by Luite Stegeman at 2026-09-17T09:02:51+05:30 rts: fix ctoi_tuple_spill_words getting out of sync Fix a few places that were not updating ctoi_tuple_spill_words correctly, leading to corruption/crashes when dealing with large unboxed tuples in bytecode: - captureContinuationAndAbort - findRetryFrameHelper/findAtomicallyFrameHelper - interpretBCO bci_BRK_FUN fixes #27633 (cherry picked from commit 192be0b6b861725613a9be5cb1587fb8cdf68bd3) - - - - - 852eee3c by Luite Stegeman at 2026-09-17T09:02:51+05:30 rts: Fix missing memory barrier in eval_thunk_selector (#27477) unchain_thunk_selectors() was missing an ACQUIRE_LOAD for the indirectee, leading to segfaults and corruption during GC on weakly-ordered architectures. Fixes #27477 (cherry picked from commit 06eee015be4e361fe9cb33e8a608ab2ea1386b52) - - - - - d99c4127 by Zubin Duggal at 2026-09-17T09:02:51+05:30 haddock: Bump version to 2.34.0 - - - - - 8a9ea3c8 by Zubin Duggal at 2026-09-17T09:02:51+05:30 Bump libffi-clib submodule to 3.6.0 - - - - - 2195b83b by Zubin Duggal at 2026-09-17T09:02:51+05:30 hadrian: update bootstrap plans and add a plan for 9.12.4 - - - - - 9910b823 by Luite Stegeman at 2026-09-17T09:02:51+05:30 rts: handle large CONSTR closures in compacting GC The function update_fwd_large in the compacting GC could run into an unexpected object with the following error: internal error: update_fwd_large: unknown/strange object 1 Closure type 1 is CONSTR. This patch adds cases for CONSTR and CONSTR_NOCAF. This is the same problem as #27434 (large AP closures, fixed by cca0d58963), which missed this case. Fixes #27649 (cherry picked from commit 749d2448eb56367046b2de890f1bf89a856ce53f) - - - - - 7202d0ef by Luite Stegeman at 2026-09-17T09:02:51+05:30 testsuite: fix T27434 test with compacting GC Ensure that the interpreter is actually run with the compacting GC (cherry picked from commit 177d615518a44dde595f3166f56ec604e0675b3b) - - - - - bc1b672c by Luite Stegeman at 2026-09-17T09:02:51+05:30 rts: initialise the stack frame header for mask_frame and apply_mask_frame We must leave the stack in consistent state before jumping to mask_frame or apply_mask_frame because they may result. Failing to do so could lead to a crash if there were waiting exceptions. Fixes #27651 (cherry picked from commit 5796aa637cca079854fc7e84e7e0fa497aacab3c) - - - - - 581fcaff by Simon Peyton Jones at 2026-09-17T09:02:51+05:30 Re-introduce the "weird SpecDict" case In this commit commit f80375dd4945350a1d784e436975b48b9c736eaf Author: Simon Peyton Jones <simon.peytonjones@gmail.com> Date: Sun Jun 29 15:26:58 2025 +0100 Refactor of Specialise.hs I removed a test for a dictionary with unbound type variables. This turned out to be wrong; see #27629. So this MR re-introduces it. (cherry picked from commit 2486cc92cea451fd6528292252a8f384e3b34dcb) - - - - - f66d17dd by Cheng Shao at 2026-09-17T09:02:51+05:30 Revert "wasm: workaround WebKit bug in dyld" This reverts commit c9b8465c2c338176fcab9d197e9d31f4aee11f68. The underlying webkit bug has been fixed in https://commits.webkit.org/314219@main. Closes #27564. (cherry picked from commit 0f48735bf5dbddd3ae43932d8abfbb0c7a13a69d) - - - - - e9cb5ac7 by Luite Stegeman at 2026-09-17T09:02:51+05:30 rts: make stg_threadLabelzh return a valid pointer for unlabeled threads. This fixes a segfault in the GC caused by stg_threadLabelzh returning a 0 pointer in a GC pointer field. stg_threadLabelzh returns a tuple of type (# Int#, ByteArray# #). If a thread has no label, the second field is unused. We must still return a valid heap object pointer. Instead of returning 0, we now return stg_DEAD_SLOT_closure. fixes #27618 (cherry picked from commit 809294f14cf6939b249d93af92c0ae174dda5b4a) - - - - - 234cd8c7 by mangoiv at 2026-09-17T09:02:51+05:30 driver: enable -finter-module-far-jumps by default this fixes a compatibility bug with certain binutils/gcc versions where we were seeing jump offset overflow errors. This commit can probably reverted if we stop supporting the problematic binutils/gcc verions (2.44 and 14.2, respectively) Reolves #26994 (cherry picked from commit 57c0f32c4e57b8b713611df44e7c51e81ba587c1) - - - - - 8c61df24 by Zubin Duggal at 2026-09-17T09:02:51+05:30 ghc-internal: annotateSTM should use catchSTM# rather than catch# A catch# frame inside a transaction breaks retry and async exception delivery. Fixes #27657 (cherry picked from commit fd22f71ee92595f4634206455d8eab111488d836) - - - - - e37f9050 by Ian-Woo Kim at 2026-09-17T09:02:51+05:30 Make the order of usages deterministic It has been observed that the ordering of usages can be non-determinstic in parallel builds. Therefore, this contribution introduces sorting of usages based on a platform- and race-independent sorting criterion. Resolves #26877. Co-authored-by: Wolfgang Jeltsch <wolfgang@well-typed.com> (cherry picked from commit d216412babfd5b5746365f0686ec370fb0892ec7) - - - - - 4685b5c4 by mangoiv at 2026-09-17T09:02:51+05:30 compiler: refactor error reporting code for ExplicitLevelImports Refactors error reporting code for ExplicitLevelImports to pass in a RdrName and a GlobalReaderElt to be able to report errors that are faithful to the source and to more precisely distinguish between names that are in scope from different qualifications. Fixes #27385 and #26616 (cherry picked from commit 141986e3680a24b76e21a7ad4ce6290a7413c7f5) - - - - - 27c14cc4 by Simon Jakobi at 2026-09-17T09:02:51+05:30 ci: Actually pass --ignore-perf-failures to the testsuite driver 684c0018d9 changed the IGNORE_PERF_FAILURES handling to append to RUNTEST_ARGS with bash array syntax, but the three use sites still expand RUNTEST_ARGS as a scalar, which yields only the first array element. The appended flag was therefore dropped in every job, so perf improvements kept failing Marge Bot batches and master pipelines, contrary to #19562. Append as a string instead, matching the existing --force-colors append in test_hadrian. Fixes #27563. Assisted-by: Claude Fable 5.1 (cherry picked from commit 4e9297ea064704da1606364365287ccf0039f7c2) - - - - - 26df2c83 by Zubin Duggal at 2026-09-17T09:02:51+05:30 Prepare 10.0.1-alpha1 Metric Increase: T4801 Metric Decrease: CoOpt_Read InstanceMatching ManyAlternatives RecordUpdPerf T13719 T14683 T15164 T16577 T20261 T4801 T5321Fun T783 T9233 T9872b_defer - - - - - 119bcd9c by Zubin Duggal at 2026-09-17T20:19:20+05:30 upload-ghc-libs: Drop GHC.Internal.TH.Monad reference from ghc-boot-th 23a50772c9c55c added GHC.Internal.TH.Monad to the bootstrap other-modules of ghc-boot-th but upload_ghc_libs.py only strips the older ghc-internal modules, so `cabal sdist` fails with "Could not find module: GHC.Internal.TH.Monad" in the hackage-doc-tarball job. - - - - - e10dd3cb by Zubin Duggal at 2026-09-18T01:50:53+05:30 Release script fixes - - - - - 845 changed files: - .gitlab/ci.sh - .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py - .gitlab/rel_eng/upload_ghc_libs.py - .gitlab/test-metrics.sh - 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testsuite/tests/vdq-rta/should_fail/all.T - testsuite/tests/wasm/should_run/control-flow/LoadCmmGroup.hs - utils/check-exact/ExactPrint.hs - utils/check-exact/Main.hs - utils/deriveConstants/Main.hs - utils/ghc-pkg/Main.hs - utils/haddock/haddock-api/haddock-api.cabal - utils/haddock/haddock-api/src/Haddock.hs - utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs - utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs - utils/haddock/haddock-api/src/Haddock/Interface/RenameType.hs - utils/haddock/haddock-api/src/Haddock/Types.hs - utils/haddock/haddock-test/src/Test/Haddock/Config.hs - utils/haddock/haddock.cabal - utils/jsffi/dyld.mjs - utils/jsffi/prelude.mjs The diff was not included because it is too large. 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