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[Git][ghc/ghc][wip/dcoutts/io-manager-selectbis] 5 commits: Add a new I/O manager based on select()
by Duncan Coutts (＠dcoutts) 11 Sep '26

11 Sep '26

Duncan Coutts pushed to branch wip/dcoutts/io-manager-selectbis at Glasgow Haskell Compiler / GHC Commits: 0ef91513 by Duncan Coutts at 2026-09-10T20:03:51+01:00 Add a new I/O manager based on select() Yes, this is the second such I/O manager, but it is a modern re-implementation based on the new in-RTS I/O manager infrastructure. So it is cleaner and faster than the old select I/O manager. Why do we need another I/O manager based on select? Why isn't the poll() one good enough as a baseline portable unix I/O manager? Because macOS. Apple Inc. is why we cannot have nice things. The man page for poll on macOS documents the fact that it does not work. At least, it does not work for all files. Specifically, it does not work for device files. Whereas macOS select() does work for device files. Aaaaarg! We _do_ want to deprecate and remove the old select I/O manager, but due to macOS we cannot do that until we have a replacement. This is that replacement. Until of course a nice new k-queue I/O manager arrives, which could become the new default for macOS and FreeBSD. Interestingly, this select I/O manager is actually faster than the poll one, on Linix, in some circumstances: specifically when many Haskell threads are waiting on the same fd. The poll I/O manager does O(n) work for n threads waiting on I/O, whereas the select one does O(fds) work for the number of fds that threads are waiting on. Usually this is 1:1, so it's not noticable, but one can concoct extreme benchmarks to show the difference. - - - - - e8fb6db1 by Duncan Coutts at 2026-09-10T20:03:51+01:00 Document the new select I/O manager in the user guide in the RTS section about I/O managers. And add a changelog entry. - - - - - 9b0d051f by Duncan Coutts at 2026-09-10T20:03:51+01:00 Minor updates in the poll I/O manager to keep in sync This keeps it in sync with select one. The changes are based on code review while implementing the new select I/O manager. The two I/O managers are so similar in structure that it makes sense to try to minimise the diff between them. This should aid understanding, and fixes to both in future. - - - - - a8f6ec1f by Duncan Coutts at 2026-09-10T20:03:51+01:00 Refactor (and rename) removeFromQueues, to simplify I/O managers Rename it to unblockAndAppendToRunQueue which better reflects what it is intended to do. The post-condition for unblockAndAppendToRunQueue is that the TSO is on the run queue or it is in the process of migrating to another cap. Previously it achieved that by always directly adding the TSO to the run queue itself. But this actually made things more complicated for the I/O managers, because it meant they needed a separate code path for notifying for cancellation compared to notifying for completion. The general notification code would always add the TSO to the run queue itself. So the improvement is to allow different cases in unblockAndAppendToRunQueue to achieve the same outcome in different ways: either directly adding to the run queue or calling helper functions that do so themselves. This then allows the new I/O managers to share code between the sync and async cancellation, and to reuse their notifyIOCompletion helpers for cancellation. This avoids a source of bugs where the completion path may be updated but the cancellation path may be forgotten, or similarly in future for sync/async operations. Update all the existing in-RTS I/O managers, and the posix timeout code. - - - - - 471450f4 by Duncan Coutts at 2026-09-10T20:03:51+01:00 Use selectbis I/O manager by default for CI coverage This should not be committed to master. It would be nice however to get better CI coverage of non-default I/O managers. - - - - - 18 changed files: - + changelog.d/select-io-manager - docs/users_guide/runtime_control.rst - libraries/base/src/GHC/RTS/Flags.hs - libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc - rts/IOManager.c - rts/IOManager.h - rts/IOManagerInternals.h - rts/RaiseAsync.c - rts/configure.ac - rts/include/rts/Flags.h - rts/posix/Poll.c - + rts/posix/SelectBis.c - + rts/posix/SelectBis.h - rts/posix/Timeout.c - rts/posix/Timeout.h - rts/rts.cabal - testsuite/tests/interface-stability/ghc-experimental-exports.stdout - testsuite/tests/interface-stability/ghc-experimental-exports.stdout-mingw32 Changes: ===================================== changelog.d/select-io-manager ===================================== @@ -0,0 +1,19 @@ +section: rts +issues: #27519 +mrs: !16359 +synopsis: + New I/O manager based on select() +description: + There is a new I/O manager on Posix systems based on select(). This exists + primarily to support macOS, where the poll() API does not work correctly + (specifically it is documented not to work for device files). It is the new + default I/O manager for the non-threaded RTS for the macOS platform. + + This is intended to allow the legacy select I/O manager to be retired. It is + also a stop-gap measure until a kqueue I/O manager is added. + + The new implementation is marginally faster in some cases. It scales better + for timers, O(log n) rather than O(m). For threads waiting on I/O it is + necessarily still O(n). If used to wait on fds > 1024 it will throw an IO + exception rather than terminating the RTS, as was the behaviour of the old + select I/O manager. ===================================== docs/users_guide/runtime_control.rst ===================================== @@ -1441,15 +1441,30 @@ limited. Currently the available I/O managers are: ================ ========= ============ - Name Platforms RTS way +I/O manager name Platforms RTS way ================ ========= ============ ``select`` Posix Non-threaded -``poll`` Posix Non-threaded +``selectbis`` Posix Non-threaded +``poll`` Posix(*) Non-threaded ``mio`` All Threaded ``win32-legacy`` Windows Non-threaded ``winio`` Windows Both ================ ========= ============ +(*) The ``poll`` I/O manager is not available on macOS due to platform +limitations. + +Currently the default I/O manager on each platform is: + +========= ============ =================== +Platform RTS way default I/O manager +========= ============ =================== +macOS Non-threaded ``selectbis`` +Posix Non-threaded ``poll`` +Windows Non-threaded ``win32-legacy`` +all Threaded ``mio`` +========= ============ =================== + .. rts-flag:: --io-manager=(name) Select the I/O manager to use. On some combinations of platform and @@ -1474,7 +1489,8 @@ This is because it uses a linked list for timers. This I/O manager is highly portable and its code is very mature: it is the I/O manager that has been used by GHC in the single-threaded RTS on Posix platforms -since time immemorial. +since time immemorial. It is likely to be retired, once the ``poll`` and +``selectbis`` I/O managers are mature enough to cover all use cases. Timer resolution: on 64bit platforms it supports microsecond precision timers while on 32bit platforms it only supports millisecond precision. Timer accuracy @@ -1485,6 +1501,29 @@ support 1024 open files. More specifically it supports file descriptors with numerical value up to 1024 but no higher. It will terminate the RTS (and thus typically the process) if this limit is exceeded. +The ``selectbis`` I/O manager +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +This I/O manager based on the classic Posix ``select()`` API. It supports +waiting on I/O readiness on non-blocking file descriptors (i.e. not disk files). +It is implemented within the RTS and is currently available only in the +non-threaded RTS. + +It scales poorly for I/O readiness notification: costing O(n) in the number of +threads that are waiting on I/O simultaneously. It scales well for timers: +most timer operations cost O(log n) in the number of simultaneous timers. This +is because it uses a heap data structure for timers. + +Timer resolution: this I/O manager supports microsecond precision timers. + +Limitation: on most platforms where it is available this I/O manager can only +support 1024 open files. More specifically it supports file descriptors with +numerical value up to 1024 but no higher. It will throw an IO exception if this +limit is exceeded. + +This I/O manager exists primarily to support macOS, due to ``poll()`` not +working properly on macOS, while ``select()`` does work. It's name reflects +the fact that it is the second I/O manager to be based on ``select()``. + The ``poll`` I/O manager ~~~~~~~~~~~~~~~~~~~~~~~~ @@ -1512,6 +1551,10 @@ limit can be adjusted using OS facilities (e.g. the ``ulimit`` command). Exceeding this limit will cause the RTS (and thus typically the process) to terminate. +This I/O manager is not available on macOS due to the ``poll()`` API not +working for all file types on macOS. Specifically the macOS man page for +``poll`` documents that it does not work for device files. + The ``mio`` I/O manager ~~~~~~~~~~~~~~~~~~~~~~~ This I/O manager is based on several platform-specific APIs. It supports ===================================== libraries/base/src/GHC/RTS/Flags.hs ===================================== @@ -393,10 +393,11 @@ internal_to_base_MiscFlags i@Internal.MiscFlags{..} = internal_to_base_ioManager Internal.IoManagerFlagAuto = IoManagerFlagAuto internal_to_base_ioManager Internal.IoManagerFlagSelect = IoManagerFlagSelect #if __GLASGOW_HASKELL__ >= 1000 + internal_to_base_ioManager Internal.IoManagerFlagSelectBis = IoManagerFlagAuto internal_to_base_ioManager Internal.IoManagerFlagPoll = IoManagerFlagAuto - -- This is a lie, we cannot translate poll. We cannot translate - -- accurately because want to freeze the API of the the compat RTS flags - -- here. Using "auto" is the least bad translation. + -- This is a lie, we cannot translate these new I/O managers. We cannot + -- translate accurately because want to freeze the API of the the compat + -- RTS flags here. Using "auto" is the least bad translation. -- https://github.com/haskell/core-libraries-committee/issues/362 #endif internal_to_base_ioManager Internal.IoManagerFlagMIO = IoManagerFlagMIO ===================================== libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc ===================================== @@ -182,6 +182,7 @@ data MiscFlags = MiscFlags data IoManagerFlag = IoManagerFlagAuto | IoManagerFlagSelect -- ^ Unix only, non-threaded RTS only + | IoManagerFlagSelectBis -- ^ Unix only, non-threaded RTS only | IoManagerFlagPoll -- ^ Unix only, non-threaded RTS only | IoManagerFlagMIO -- ^ cross-platform, threaded RTS only | IoManagerFlagWinIO -- ^ Windows only ===================================== rts/IOManager.c ===================================== @@ -33,6 +33,11 @@ #include "posix/Signals.h" #endif +#if defined(IOMGR_ENABLED_SELECTBIS) +#include "posix/SelectBis.h" +#include "posix/Timeout.h" +#endif + #if defined(IOMGR_ENABLED_POLL) #include "posix/Poll.h" #include "posix/Timeout.h" @@ -117,6 +122,14 @@ parseIOManagerFlag(const char *iomgrstr, IO_MANAGER_FLAG *flag) return IOManagerAvailable; #else return IOManagerUnavailable; +#endif + } + else if (strcmp("selectbis", iomgrstr) == 0) { +#if defined(IOMGR_ENABLED_SELECTBIS) + *flag = IO_MNGR_FLAG_SELECTBIS; + return IOManagerAvailable; +#else + return IOManagerUnavailable; #endif } else if (strcmp("poll", iomgrstr) == 0) { @@ -226,6 +239,8 @@ void selectIOManager(void) #else // !defined(THREADED_RTS) #if defined(IOMGR_DEFAULT_NON_THREADED_SELECT) iomgr_type = IO_MANAGER_SELECT; +#elif defined(IOMGR_DEFAULT_NON_THREADED_SELECTBIS) + iomgr_type = IO_MANAGER_SELECTBIS; #elif defined(IOMGR_DEFAULT_NON_THREADED_POLL) iomgr_type = IO_MANAGER_POLL; #elif defined(IOMGR_DEFAULT_NON_THREADED_WINIO) @@ -244,6 +259,12 @@ void selectIOManager(void) break; #endif +#if defined(IOMGR_ENABLED_SELECTBIS) + case IO_MNGR_FLAG_SELECTBIS: + iomgr_type = IO_MANAGER_SELECTBIS; + break; +#endif + #if defined(IOMGR_ENABLED_POLL) case IO_MNGR_FLAG_POLL: iomgr_type = IO_MANAGER_POLL; @@ -291,6 +312,10 @@ char * showIOManager(void) case IO_MANAGER_SELECT: return "select"; #endif +#if defined(IOMGR_ENABLED_SELECTBIS) + case IO_MANAGER_SELECTBIS: + return "selectbis"; +#endif #if defined(IOMGR_ENABLED_POLL) case IO_MANAGER_POLL: return "poll"; @@ -347,6 +372,12 @@ void initCapabilityIOManager(CapIOManager *iomgr) break; #endif +#if defined(IOMGR_ENABLED_SELECTBIS) + case IO_MANAGER_SELECTBIS: + initCapabilityIOManagerSelectBis(iomgr); + break; +#endif + #if defined(IOMGR_ENABLED_POLL) case IO_MANAGER_POLL: initCapabilityIOManagerPoll(iomgr); @@ -380,6 +411,12 @@ void freeCapabilityIOManager(CapIOManager *iomgr) break; #endif +#if defined(IOMGR_ENABLED_SELECTBIS) + case IO_MANAGER_SELECTBIS: + freeCapabilityIOManagerSelectBis(iomgr); + break; +#endif + #if defined(IOMGR_ENABLED_POLL) case IO_MANAGER_POLL: freeCapabilityIOManagerPoll(iomgr); @@ -464,6 +501,7 @@ restartIOManager(CapIOManager *iomgr, Capability **pcap) break; #endif /* The IO_MANAGER_SELECT needs no initialisation */ + /* The IO_MANAGER_SELECTBIS needs no initialisation */ /* The IO_MANAGER_POLL needs no initialisation */ /* No impl for any of the Windows I/O managers, since no forking. */ @@ -555,8 +593,14 @@ void markCapabilityIOManager(evac_fn evac, void *user, CapIOManager *iomgr) break; #endif +#if defined(IOMGR_ENABLED_SELECTBIS) \ + || defined(IOMGR_ENABLED_POLL) +#if defined(IOMGR_ENABLED_SELECTBIS) + case IO_MANAGER_SELECTBIS: +#endif #if defined(IOMGR_ENABLED_POLL) case IO_MANAGER_POLL: +#endif markClosureTable(evac, user, &iomgr->aiop_table); evac(user, (StgClosure **)(void *)&iomgr->timeout_queue); break; @@ -600,6 +644,11 @@ bool anyPendingTimeoutsOrIO(CapIOManager *iomgr) || (iomgr->sleeping_queue != END_TSO_QUEUE); #endif +#if defined(IOMGR_ENABLED_SELECTBIS) + case IO_MANAGER_SELECTBIS: + return anyPendingTimeoutsOrIOSelectBis(iomgr); +#endif + #if defined(IOMGR_ENABLED_POLL) case IO_MANAGER_POLL: return anyPendingTimeoutsOrIOPoll(iomgr); @@ -659,6 +708,12 @@ void pollCompletedTimeoutsOrIO(CapIOManager *iomgr) break; #endif +#if defined(IOMGR_ENABLED_SELECTBIS) + case IO_MANAGER_SELECTBIS: + pollCompletedTimeoutsOrIOSelectBis(iomgr); + break; +#endif + #if defined(IOMGR_ENABLED_POLL) case IO_MANAGER_POLL: pollCompletedTimeoutsOrIOPoll(iomgr); @@ -693,6 +748,12 @@ bool awaitCompletedTimeoutsOrIO(CapIOManager *iomgr) break; #endif +#if defined(IOMGR_ENABLED_SELECTBIS) + case IO_MANAGER_SELECTBIS: + completed = awaitCompletedTimeoutsOrIOSelectBis(iomgr); + break; +#endif + #if defined(IOMGR_ENABLED_POLL) case IO_MANAGER_POLL: completed = awaitCompletedTimeoutsOrIOPoll(iomgr); @@ -734,6 +795,12 @@ void interruptIOManager(CapIOManager *iomgr) break; #endif +#if defined(IOMGR_ENABLED_SELECTBIS) + case IO_MANAGER_SELECTBIS: + interruptIOManagerSelectBis(iomgr); + break; +#endif + #if defined(IOMGR_ENABLED_POLL) case IO_MANAGER_POLL: interruptIOManagerPoll(iomgr); @@ -783,6 +850,10 @@ IOSubmitResult syncIOWaitReady(CapIOManager *iomgr, return IOSubmitResultAsyncContinue; } #endif +#if defined(IOMGR_ENABLED_SELECTBIS) + case IO_MANAGER_SELECTBIS: + return syncIOWaitReadySelectBis(iomgr, tso, rw, fd); +#endif #if defined(IOMGR_ENABLED_POLL) case IO_MANAGER_POLL: return syncIOWaitReadyPoll(iomgr, tso, rw, fd); @@ -803,6 +874,13 @@ void syncIOCancel(CapIOManager *iomgr, StgTSO *tso) &iomgr->blocked_queue_hd, &iomgr->blocked_queue_tl, tso); + appendToRunQueue(iomgr->cap, tso); + RELEASE_STORE(&tso->why_blocked, NotBlocked); + break; +#endif +#if defined(IOMGR_ENABLED_SELECTBIS) + case IO_MANAGER_SELECTBIS: + syncIOCancelSelectBis(iomgr, tso); break; #endif #if defined(IOMGR_ENABLED_POLL) @@ -817,11 +895,14 @@ void syncIOCancel(CapIOManager *iomgr, StgTSO *tso) &iomgr->blocked_queue_tl, tso); abandonWorkRequest(tso->block_info.async_reqID); + appendToRunQueue(iomgr->cap, tso); + RELEASE_STORE(&tso->why_blocked, NotBlocked); break; #endif default: barf("syncIOCancel not supported for I/O manager %d", iomgr_type); } + ASSERT(tso->why_blocked == NotBlocked); } @@ -848,8 +929,14 @@ bool syncDelay(CapIOManager *iomgr, StgTSO *tso, HsInt us_delay) return true; } #endif +#if defined(IOMGR_ENABLED_SELECTBIS) \ + || defined(IOMGR_ENABLED_POLL) +#if defined(IOMGR_ENABLED_SELECTBIS) + case IO_MANAGER_SELECTBIS: +#endif #if defined(IOMGR_ENABLED_POLL) case IO_MANAGER_POLL: +#endif return syncDelayTimeout(iomgr, tso, us_delay); #endif #if defined(IOMGR_ENABLED_WIN32_LEGACY) @@ -883,10 +970,18 @@ void syncDelayCancel(CapIOManager *iomgr, StgTSO *tso) case IO_MANAGER_SELECT: ASSERT(tso->why_blocked == (BlockedOnDelay | BlockInfoForceNonClosure)); removeThreadFromQueue(iomgr->cap, &iomgr->sleeping_queue, tso); + appendToRunQueue(iomgr->cap, tso); + RELEASE_STORE(&tso->why_blocked, NotBlocked); break; #endif +#if defined(IOMGR_ENABLED_SELECTBIS) \ + || defined(IOMGR_ENABLED_POLL) +#if defined(IOMGR_ENABLED_SELECTBIS) + case IO_MANAGER_SELECTBIS: +#endif #if defined(IOMGR_ENABLED_POLL) case IO_MANAGER_POLL: +#endif syncDelayCancelTimeout(iomgr, tso); break; #endif @@ -900,6 +995,7 @@ void syncDelayCancel(CapIOManager *iomgr, StgTSO *tso) default: barf("syncDelayCancel not supported for I/O manager %d", iomgr_type); } + ASSERT(tso->why_blocked == NotBlocked); } ===================================== rts/IOManager.h ===================================== @@ -53,6 +53,9 @@ extern bool rts_IOManagerIsWin32Native; #if defined(IOMGR_BUILD_SELECT) && !defined(THREADED_RTS) #define IOMGR_ENABLED_SELECT #endif +#if defined(IOMGR_BUILD_SELECTBIS) && !defined(THREADED_RTS) + #define IOMGR_ENABLED_SELECTBIS +#endif #if defined(IOMGR_BUILD_POLL) && !defined(THREADED_RTS) #define IOMGR_ENABLED_POLL #endif @@ -95,6 +98,8 @@ extern bool rts_IOManagerIsWin32Native; #else // !defined(THREADED_RTS) #if defined(IOMGR_DEFAULT_NON_THREADED_SELECT) #define IOMGR_DEFAULT_STR "select" +#elif defined(IOMGR_DEFAULT_NON_THREADED_SELECTBIS) + #define IOMGR_DEFAULT_STR "selectbis" #elif defined(IOMGR_DEFAULT_NON_THREADED_POLL) #define IOMGR_DEFAULT_STR "poll" #elif defined(IOMGR_DEFAULT_NON_THREADED_WINIO) @@ -115,6 +120,11 @@ extern bool rts_IOManagerIsWin32Native; #else #define IOMGR_ENABLED_STR_SELECT "" #endif +#if defined(IOMGR_ENABLED_SELECTBIS) + #define IOMGR_ENABLED_STR_SELECTBIS " selectbis" +#else + #define IOMGR_ENABLED_STR_SELECTBIS "" +#endif #if defined(IOMGR_ENABLED_POLL) #define IOMGR_ENABLED_STR_POLL " poll" #else @@ -137,6 +147,7 @@ extern bool rts_IOManagerIsWin32Native; #endif #define IOMGRS_ENABLED_STR \ IOMGR_ENABLED_STR_SELECT \ + IOMGR_ENABLED_STR_SELECTBIS \ IOMGR_ENABLED_STR_POLL \ IOMGR_ENABLED_STR_MIO \ IOMGR_ENABLED_STR_WINIO \ @@ -150,6 +161,9 @@ typedef enum { #if defined(IOMGR_ENABLED_SELECT) IO_MANAGER_SELECT, #endif +#if defined(IOMGR_ENABLED_SELECTBIS) + IO_MANAGER_SELECTBIS, +#endif #if defined(IOMGR_ENABLED_POLL) IO_MANAGER_POLL, #endif @@ -353,11 +367,13 @@ enum IOSubmitResultCodes { /* Called from CMM primop */ IOSubmitResult syncIOWaitReady(CapIOManager *iomgr, StgTSO *tso, IOReadOrWrite rw, HsInt fd); +/* Cancel the I/O the TSO is blocked on and add the TSO to the run queue */ void syncIOCancel(CapIOManager *iomgr, StgTSO *tso); /* Called from CMM primop */ bool syncDelay(CapIOManager *iomgr, StgTSO *tso, HsInt us_delay); +/* Cancel the timeout the TSO is blocked on and add the TSO to the run queue */ void syncDelayCancel(CapIOManager *iomgr, StgTSO *tso); #if defined(IOMGR_ENABLED_SELECT) || defined(IOMGR_ENABLED_WIN32_LEGACY) ===================================== rts/IOManagerInternals.h ===================================== @@ -14,12 +14,20 @@ #include "IOManager.h" -#if defined(IOMGR_ENABLED_POLL) -#include <poll.h> /* for struct pollfd */ +#if defined(IOMGR_ENABLED_SELECTBIS) \ + || defined(IOMGR_ENABLED_POLL) #include "ClosureTable.h" #include "TimeoutQueue.h" #endif +#if defined(IOMGR_ENABLED_SELECTBIS) +#include <sys/select.h> /* for fd_set */ +#endif + +#if defined(IOMGR_ENABLED_POLL) +#include <poll.h> /* for struct pollfd */ +#endif + #include "BeginPrivate.h" /* The per-capability data structures belonging to the I/O manager. @@ -46,19 +54,27 @@ struct _CapIOManager { StgTSO *sleeping_queue; #endif -#if defined(IOMGR_ENABLED_SELECT) || defined(IOMGR_ENABLED_POLL) +#if defined(IOMGR_ENABLED_SELECT) \ + || defined(IOMGR_ENABLED_SELECTBIS) \ + || defined(IOMGR_ENABLED_POLL) #if defined(HAVE_PREEMPTION) /* FDs for waking up the I/O manager when it is blocked waiting */ int interrupt_fd_r, interrupt_fd_w; #endif #endif -#if defined(IOMGR_ENABLED_POLL) +#if defined(IOMGR_ENABLED_POLL) \ + || defined(IOMGR_ENABLED_SELECTBIS) /* AIOP and timeout collections shared by several I/O manager impls */ ClosureTable aiop_table; StgTimeoutQueue *timeout_queue; #endif +#if defined(IOMGR_ENABLED_SELECTBIS) + struct fd_table_entry { int fd; IOReadOrWrite rw; } *fd_table; + fd_set *rfds, *wfds; +#endif + #if defined(IOMGR_ENABLED_POLL) /* Auxiliary table with size and indexes matching the aiop_table. This is * aliased to the tail of the full poll table, which has a head entry for ===================================== rts/RaiseAsync.c ===================================== @@ -28,7 +28,7 @@ static void blockedThrowTo (Capability *cap, StgTSO *target, MessageThrowTo *msg); -static void removeFromQueues(Capability *cap, StgTSO *tso); +static void unblockAndAppendToRunQueue(Capability *cap, StgTSO *tso); static void removeFromMVarBlockedQueue (StgTSO *tso); @@ -62,8 +62,10 @@ throwToSingleThreaded__ (Capability *cap, StgTSO *tso, StgClosure *exception, return; } - // Remove it from any blocking queues - removeFromQueues(cap,tso); + // Remove it from any blocking queues and add it to the run queue + unblockAndAppendToRunQueue(cap,tso); + ASSERT(tso->why_blocked == NotBlocked || + tso->why_blocked == ThreadMigrating); raiseAsync(cap, tso, exception, stop_at_atomically, stop_here); } @@ -471,7 +473,7 @@ check_target: blockedThrowTo(cap,target,msg); return THROWTO_BLOCKED; } else { - removeFromQueues(cap,target); + unblockAndAppendToRunQueue(cap,target); raiseAsync(cap, target, msg->exception, false, NULL); return THROWTO_SUCCESS; } @@ -612,16 +614,7 @@ awakenBlockedExceptionQueue (Capability *cap, StgTSO *tso) tso->blocked_exceptions = END_BLOCKED_EXCEPTIONS_QUEUE; } -/* ----------------------------------------------------------------------------- - Remove a thread from blocking queues. - - This is for use when we raise an exception in another thread, which - may be blocked. - - Precondition: we have exclusive access to the TSO, via the same set - of conditions as throwToSingleThreaded() (c.f.). - -------------------------------------------------------------------------- */ - +// Helper for unblockAndAppendToRunQueue static void removeFromMVarBlockedQueue (StgTSO *tso) { @@ -664,13 +657,24 @@ removeFromMVarBlockedQueue (StgTSO *tso) tso->_link = END_TSO_QUEUE; } +/* ----------------------------------------------------------------------------- + Remove a thread from blocking queues (if any) and add it to the run queue + (if it wasn't on the run queue already). + + This is for use when we raise an exception in another thread, which + may be blocked. + + Precondition: we have exclusive access to the TSO, via the same set + of conditions as throwToSingleThreaded() (c.f.). + -------------------------------------------------------------------------- */ + static void -removeFromQueues(Capability *cap, StgTSO *tso) +unblockAndAppendToRunQueue(Capability *cap, StgTSO *tso) { switch (UntagWhyBlocked(ACQUIRE_LOAD(&tso->why_blocked))) { - case NotBlocked: - case ThreadMigrating: + case NotBlocked: // Already on the run queue + case ThreadMigrating: // Not added to the run queue return; case BlockedOnSTM: @@ -680,16 +684,16 @@ removeFromQueues(Capability *cap, StgTSO *tso) // perhaps have a debugging test to make sure that this really // happens and that the 'zombie' transaction does not get // committed. - goto done; + break; case BlockedOnMVar: case BlockedOnMVarRead: removeFromMVarBlockedQueue(tso); - goto done; + break; case BlockedOnBlackHole: // nothing to do - goto done; + break; case BlockedOnMsgThrowTo: { @@ -709,18 +713,19 @@ removeFromQueues(Capability *cap, StgTSO *tso) case BlockedOnDoProc: // These blocking reasons are only used by some I/O managers syncIOCancel(cap->iomgr, tso); - goto done; + return; case BlockedOnDelay: // This blocking reasons is only used by some I/O managers syncDelayCancel(cap->iomgr, tso); - goto done; + return; default: - barf("removeFromQueues: %d", tso->why_blocked); + barf("unblockAndAppendToRunQueue: %d", tso->why_blocked); } - done: + // The cases above that use return add the TSO to the run queue themselves + // (or don't need to). For the rest (that use break) we do it here. appendToRunQueue(cap, tso); RELEASE_STORE(&tso->why_blocked, NotBlocked); } ===================================== rts/configure.ac ===================================== @@ -368,6 +368,15 @@ GHC_IOMANAGER_ENABLE([select], [EnableIOManagerSelect], [IOMGR_BUILD_SELECT], [AC_MSG_ERROR([sys/select.h required by select I/O manager])],[]) fi]) +GHC_IOMANAGER_ENABLE([selectbis], [EnableIOManagerSelectBis], [IOMGR_BUILD_SELECTBIS], + [if test "$HostOS" = "mingw32"; then + EnableIOManagerSelectBis=NO + else + AC_CHECK_HEADER([sys/select.h], + [EnableIOManagerSelectBis=YES], + [AC_MSG_ERROR([sys/select.h required by selectbis I/O manager])],[]) + fi]) + GHC_IOMANAGER_ENABLE([poll], [EnableIOManagerPoll], [IOMGR_BUILD_POLL], [if test "$HostOS" = "mingw32"; then EnableIOManagerPoll=NO @@ -407,6 +416,7 @@ if test "$HostOS" = "mingw32"; then else GHC_IOMANAGER_DEFAULT_SELECT([IOManagerNonThreadedDefault], [select], [EnableIOManagerSelect]) GHC_IOMANAGER_DEFAULT_SELECT([IOManagerNonThreadedDefault], [poll], [EnableIOManagerPoll]) + GHC_IOMANAGER_DEFAULT_SELECT([IOManagerNonThreadedDefault], [selectbis], [EnableIOManagerSelectBis]) GHC_IOMANAGER_DEFAULT_SELECT([IOManagerThreadedDefault], [mio], [EnableIOManagerMIO]) fi GHC_IOMANAGER_DEFAULT_CHECK_NOT_EMPTY([IOManagerNonThreadedDefault],[non-threaded]) @@ -419,6 +429,9 @@ dnl Now define CPP vars for the default ones (threaded and non-threaded) GHC_IOMANAGER_DEFAULT_AC_DEFINE([IOManagerNonThreadedDefault], [non-threaded], [select], [IOMGR_DEFAULT_NON_THREADED_SELECT]) +GHC_IOMANAGER_DEFAULT_AC_DEFINE([IOManagerNonThreadedDefault], [non-threaded], + [selectbis], [IOMGR_DEFAULT_NON_THREADED_SELECTBIS]) + GHC_IOMANAGER_DEFAULT_AC_DEFINE([IOManagerNonThreadedDefault], [non-threaded], [poll], [IOMGR_DEFAULT_NON_THREADED_POLL]) ===================================== rts/include/rts/Flags.h ===================================== @@ -258,6 +258,7 @@ typedef enum _IO_MANAGER_FLAG { /* All other choices pick only the requested one, with no fallback. */ IO_MNGR_FLAG_SELECT, /* Unix only, non-threaded RTS only */ + IO_MNGR_FLAG_SELECTBIS, /* Unix only, non-threaded RTS only */ IO_MNGR_FLAG_POLL, /* Unix only, non-threaded RTS only */ IO_MNGR_FLAG_MIO, /* cross-platform, threaded RTS only */ IO_MNGR_FLAG_WINIO, /* Windows only */ ===================================== rts/posix/Poll.c ===================================== @@ -132,7 +132,7 @@ the aiop_table, but still allows the full_poll_table to have an extra entry. /* Forward declarations */ static bool enlargeTables(CapIOManager *iomgr); static void notifyIOCompletion(CapIOManager *iomgr, StgAsyncIOOp *aiop); -static void ioCancel(CapIOManager *iomgr, StgAsyncIOOp *aiop); +static void removeFromTables(CapIOManager *iomgr, int i); static void reportPollError(int res, nfds_t nfds) STG_NORETURN; @@ -222,20 +222,7 @@ void syncIOCancelPoll(CapIOManager *iomgr, StgTSO *tso) StgAsyncIOOp *aiop = tso->block_info.aiop; ASSERT(aiop->notify_type == NotifyTSO); ASSERT(indexClosureTable(&iomgr->aiop_table, aiop->index) == aiop); - ioCancel(iomgr, aiop); - setTsoIOOpOutcome(tso, aiop->outcome, aiop->result); - /* We cannot use the normal notifyIOCompletion here. We are in the context - * of throwTo, interrupting a thread blocked on IO via an async exception. - * We don't put the TSO back on the run queue or change the why_blocked - * status, as that is done by removeFromQueues (in the throwTo* functions). - */ - - /* We are in the TSO case, where the aiop was only reachable from the TSO - * itself, and thus it is now no longer be reachable at all. - */ - IF_NONMOVING_WRITE_BARRIER_ENABLED { - updateRemembSetPushClosure(iomgr->cap, (StgClosure *)aiop); - } + asyncIOCancelPoll(iomgr, aiop); } @@ -246,29 +233,14 @@ void asyncIOCancelPoll(CapIOManager *iomgr, StgAsyncIOOp *aiop) * because each aiop is GC heap allocated, so cannot be recycled until it * is no longer retained by the application. */ - ASSERT(aiop->notify_type != NotifyTSO); if (indexClosureTable(&iomgr->aiop_table, aiop->index) == aiop) { - ioCancel(iomgr, aiop); + removeFromTables(iomgr, aiop->index); + aiop->outcome = IOOpOutcomeCancelled; notifyIOCompletion(iomgr, aiop); } } -static void ioCancel(CapIOManager *iomgr, StgAsyncIOOp *aiop) -{ - int ix = aiop->index; - int ix_from; int ix_to; - removeCompactClosureTable(iomgr->cap, &iomgr->aiop_table, ix, - &ix_from, &ix_to); - if (ix_to != ix_from) { - StgAsyncIOOp *aiop_to = indexClosureTable(&iomgr->aiop_table, ix_to); - aiop_to->index = ix_to; - iomgr->aiop_poll_table[ix_to] = iomgr->aiop_poll_table[ix_from]; - } - aiop->outcome = IOOpOutcomeCancelled; -} - - bool anyPendingTimeoutsOrIOPoll(CapIOManager *iomgr) { return !isEmptyTimeoutQueue(iomgr->timeout_queue) @@ -349,6 +321,8 @@ static bool processIOCompletions(CapIOManager *iomgr, int ncompletions) if (aiop_poll_table[i].revents) { StgAsyncIOOp *aiop = indexClosureTable(&iomgr->aiop_table, i); + ASSERT(aiop->outcome == IOOpOutcomeInFlight); + /* We do need to handle POLLNVAL, but we do not need to do anything * special for POLLERR or POLLHUP. (See man poll for details). * The calling thread will typically try to do I/O after waiting @@ -364,26 +338,14 @@ static bool processIOCompletions(CapIOManager *iomgr, int ncompletions) aiop->result = 0; } - /* Remove from the completion table, preserving compactness, and - * apply the same compacting to the aiop_poll_table. - */ - int ix_from; int ix_to; - removeCompactClosureTable(iomgr->cap, &iomgr->aiop_table, i, - &ix_from, &ix_to); - if (ix_to != ix_from) { - StgAsyncIOOp *aiop_to; - aiop_to = indexClosureTable(&iomgr->aiop_table, ix_to); - aiop_to->index = ix_to; - aiop_poll_table[ix_to] = aiop_poll_table[ix_from]; - } - + removeFromTables(iomgr, i); notifyIOCompletion(iomgr, aiop); n--; } else { - /* You'd expect incrementing the poll table index to be - * unconditional, but we don't increment the index if we did - * process the entry, because using removeCompactClosureTable - * means we'll move an entry from the end into the same index. + /* You'd expect incrementing the table index to be unconditional, + * but we don't increment the index if we did process the entry, + * because using removeFromTables means we'll move an entry from + * the end of the table into the index i. */ i++; } @@ -564,6 +526,7 @@ bool awaitCompletedTimeoutsOrIOPoll(CapIOManager *iomgr) return !interrupt; } + static void reportPollError(int res, nfds_t nfds) { if (errno == EINVAL) { @@ -619,4 +582,20 @@ static bool enlargeTables(CapIOManager *iomgr) return true; } + +/* Remove from the completion table, preserving compactness, and apply the same + * compacting to the aiop_poll_table. + */ +static void removeFromTables(CapIOManager *iomgr, int ix) +{ + int ix_from; int ix_to; + removeCompactClosureTable(iomgr->cap, &iomgr->aiop_table, ix, + &ix_from, &ix_to); + if (ix_to != ix_from) { + StgAsyncIOOp *aiop_to = indexClosureTable(&iomgr->aiop_table, ix_to); + aiop_to->index = ix_to; + iomgr->aiop_poll_table[ix_to] = iomgr->aiop_poll_table[ix_from]; + } +} + #endif /* IOMGR_ENABLED_POLL */ ===================================== rts/posix/SelectBis.c ===================================== @@ -0,0 +1,668 @@ +/* ----------------------------------------------------------------------------- + * + * (c) The GHC Team 2020-2026 + * + * A second I/O manager based on the classic Unix select() system call. + * + * See SelectBis.h for the sad story of why this exists. + * + * ---------------------------------------------------------------------------*/ + +#include "rts/PosixSource.h" +#include "Rts.h" +#include "RtsFlags.h" // needed by SET_HDR macro + +#include "IOManager.h" // defines IOMGR_ENABLED_SELECTBIS + +#if defined(IOMGR_ENABLED_SELECTBIS) + +#include "Capability.h" +#include "Threads.h" +#include "Schedule.h" +#include "Prelude.h" +#include "RtsUtils.h" +#include "rts/Time.h" +#include "Trace.h" + +#include "SelectBis.h" +#include "RtsSignals.h" + +#include <errno.h> +#include <sys/select.h> + +#include "IOManagerInternals.h" +#include "Timeout.h" +#include "FdWakeup.h" + +/****************************************************************************** + +This I/O manager is based on the classic Unix select() system call. + + int select(int nfds, fd_set *readfds, fd_set *writefds, + fd_set *exceptfds, struct timeval *timeout); + +The select() call has various limits, quirks and slight differences between +historical Unix variants. + +The basic idea is to collect a set of fds (represented as a bitset) that we are +interested in: one for reads, one for writes. The call then queries for I/O +readiness on all the fds in the read and write sets. The result is a set of fds +that are ready to read from, and a set that are ready to write to. The same +bitset representation is used for the output. Indeed a "fun" quirk of select() +is that it mutates the fd sets it is passed, which means they either need to be +built up each time, or copied. There is also an optional timeout if no fds are +ready immediately. There is also an fd bitset for "exceptional conditions" +which we do not use. + +There is of course no incremental behaviour here; this is a bulk one-off call +with no persistent state. This has obvious scaling problems. The cost each time +is O(n) in the maximum of the integer value of the fds of interest. There is +also a maximum bitset size. On Linux this is 1024. This means select() cannot +be used if the process uses more than that many open files, even if we're only +interested in a few. On OSX the default limit is also 1024 but this can be +raised or even managed dynamically, at the cost of more memory (and some +non-standard code). + +That particular problem is solved by the later Unix poll() system call, which +uses an array of the fds we are interested in, which means it is not limited by +the absolute value of the fds numbers (but it is still O(n) in how many fds we +are interested in). + +We have some choice in how we process results. We want to find the intersection +between the requests for notification of I/O readiness (coming from the Haskell +threads) and the read and write bit sets. There's not much clever we can do to +compute this intersection efficiently: we can either iterate over the bit sets +or over the readiness requests. There is no obvious answer here. Typically +there will be few results compared to the number of requests and a bitset scan +could be fast. In practice we cannot portably scan the bitset efficiently (e.g. +word at a time). Portably, we can only probe each bit at a time using FD_ISSET. +Portability is the main reason to use select() rather than a more modern +interface, so we have to take it seriously here. Furthermore, if we iterated +over the bit sets we would have to maintain a mapping from fd to requests. + +In principle we also have the choice to maintain the read and write fd bit sets +incrementally, or create them afresh each time we call select(). There is no +asymptotic bonus to maintaining them incrementally since the whole thing is +O(n) anyway. There could plausibly be some constant factor benefit. To maintain +the fd bit sets incrementally we would need to maintain a mapping between +requests and fds. This would also be an extra cost that would have to be +outweighed by any saving. + +In the end we take the simple approach to constructing the bitset inputs and to +results processing. We create the bit sets afresh each time from the collection +of requests. For processing results we iterate over the requests and look up +each one to see if it is in the appropriate result bitset. Along with each +operation, we store the fd and whether we were interested in reading or writing. +We iterate over the operations and use the fd and r/w information to construct +the read and write bit sets. + +A particularly frustrating feature of select() is that if any single fd in any +fd bitset is invalid (e.g. because the file was already closed) then select() +fails and tells us there is a bad fd somewhere, but it has no way to indicate +which fd was bad. This is really quite annoying as we then have to do a search +through the fds to find which one was bad. + +The primary data structure for this I/O manager is a aiop_table which is a +ClosureTable of AsyncIOOps. This table tracks the active I/O operations, with +one entry per operation (corresponding to threads calling waitRead#/waitWrite#). +We also track the fd for each operation and whether the operation is waiting on +read or write readiness. This additional information is stored in the fd_table. +The fd_table is maintained as an auxiliary table to the aiop_table, with table +indexes matching the ClosureTable. So there is an entry in the aiop_table for +each operation, and a corresponding entry in the fd_table at the same table +index. The aiop_table and the fd_table are maintained incrementally, and with +dense indexes. + +We also use a StgTimeoutQueue to track timeouts, and use the delay to the next +timeout (if any) as the poll() timeout parameter. + +The CapIOManager structure for this I/O manager contains: + + ClosureTable aiop_table; + struct fd_table_entry { int fd; IOReadOrWrite rw } *fd_table; + StgTimeoutQueue *timeout_queue; + int interrupt_fd_r, interrupt_fd_w; + +******************************************************************************/ + +/* Forward declarations */ +static bool enlargeTables(CapIOManager *iomgr); +static void notifyIOCompletion(CapIOManager *iomgr, StgAsyncIOOp *aiop); +static void removeFromTables(CapIOManager *iomgr, int i); +static bool fdInSelectRange(int fd); +static int collectFdSets(CapIOManager *iomgr); +static void processBadFds(CapIOManager *iomgr); +static void reportSelectError(void) STG_NORETURN; + + +void initCapabilityIOManagerSelectBis(CapIOManager *iomgr) +{ + initClosureTable(&iomgr->aiop_table, ClosureTableCompact); + iomgr->timeout_queue = emptyTimeoutQueue(); + +#if defined(HAVE_PREEMPTION) + newFdWakeup(&iomgr->interrupt_fd_r, &iomgr->interrupt_fd_w); + + /* Would never happen in a standalone process, but could plausibly happen + * if the RTS is used within another process that already has many open fds. + */ + if (iomgr->interrupt_fd_r < 0 || iomgr->interrupt_fd_r >= (int)FD_SETSIZE || + iomgr->interrupt_fd_w < 0 || iomgr->interrupt_fd_w >= (int)FD_SETSIZE) { + barf("initCapabilityIOManagerSelectBis: fds out of select range"); + } +#endif + + iomgr->fd_table = NULL; + iomgr->rfds = stgMallocBytes(sizeof (fd_set), "IOManagerSelectBis"); + iomgr->wfds = stgMallocBytes(sizeof (fd_set), "IOManagerSelectBis"); +} + + +void freeCapabilityIOManagerSelectBis(CapIOManager *iomgr) +{ + if (iomgr->fd_table) stgFree(iomgr->fd_table); + stgFree(iomgr->rfds); + stgFree(iomgr->wfds); +#if defined(HAVE_PREEMPTION) + closeFdWakeup(iomgr->interrupt_fd_r, iomgr->interrupt_fd_w); +#endif +} + + +/* Used to implement syncIOWaitReady. */ +IOSubmitResult syncIOWaitReadySelectBis(CapIOManager *iomgr, StgTSO *tso, + IOReadOrWrite rw, HsInt fd) +{ + StgAsyncIOOp *aiop; + aiop = (StgAsyncIOOp *)allocateMightFail(iomgr->cap, sizeofW(StgAsyncIOOp)); + if (RTS_UNLIKELY(aiop == NULL)) return IOSubmitResultHeapOverflow; + SET_HDR(aiop, &stg_ASYNCIOOP_info, iomgr->cap->r.rCCCS); + aiop->notify.tso = tso; + aiop->notify_type = NotifyTSO; + aiop->live = &stg_ASYNCIO_LIVE0_closure; + tso->block_info.aiop = aiop; + RELEASE_STORE(&tso->why_blocked, rw == IORead ? BlockedOnRead + : BlockedOnWrite); + return asyncIOWaitReadySelectBis(iomgr, aiop, rw, fd); +} + +IOSubmitResult asyncIOWaitReadySelectBis(CapIOManager *iomgr, + StgAsyncIOOp *aiop, + IOReadOrWrite rw, int fd) +{ + if (RTS_UNLIKELY(isFullClosureTable(&iomgr->aiop_table))) { + bool ok = enlargeTables(iomgr); + if (RTS_UNLIKELY(!ok)) return IOSubmitResultHeapOverflow; + } + + if (RTS_UNLIKELY(!fdInSelectRange(fd))) { + /* Synchronous error */ + aiop->outcome = IOOpOutcomeFailed; + aiop->error = EBADF; + return -EBADF; + }; + + int ix = insertClosureTable(iomgr->cap, &iomgr->aiop_table, aiop); + + /* We use the aiop_table and fd_table densely. */ + ASSERT(ix == sizeClosureTable(&iomgr->aiop_table) - 1); + + /* The syncIO wrapper or CMM primop filled in the notify and live fields, + * we fill the rest. + */ + aiop->capno = iomgr->cap->no; + aiop->index = ix; + aiop->outcome = IOOpOutcomeInFlight; + + /* Fill in the corresponding entry in the fd_table */ + iomgr->fd_table[ix] = (struct fd_table_entry) { + .fd = fd, + .rw = rw + }; + + return IOSubmitResultAsyncContinue; +} + + +void syncIOCancelSelectBis(CapIOManager *iomgr, StgTSO *tso) +{ + StgAsyncIOOp *aiop = tso->block_info.aiop; + ASSERT(aiop->notify_type == NotifyTSO); + ASSERT(indexClosureTable(&iomgr->aiop_table, aiop->index) == aiop); + asyncIOCancelSelectBis(iomgr, aiop); +} + + +void asyncIOCancelSelectBis(CapIOManager *iomgr, StgAsyncIOOp *aiop) +{ + /* We can reliably determine if the aiop is still in progress by checking + * if the aiop_table still points to this aiop object. This is reliable + * because each aiop is GC heap allocated, so cannot be recycled until it + * is no longer retained by the application. + */ + if (indexClosureTable(&iomgr->aiop_table, aiop->index) == aiop) { + removeFromTables(iomgr, aiop->index); + aiop->outcome = IOOpOutcomeCancelled; + notifyIOCompletion(iomgr, aiop); + } +} + + +bool anyPendingTimeoutsOrIOSelectBis(CapIOManager *iomgr) +{ + return !isEmptyTimeoutQueue(iomgr->timeout_queue) + || !isEmptyClosureTable(&iomgr->aiop_table); +} + + +static void notifyIOCompletion(CapIOManager *iomgr, StgAsyncIOOp *aiop) +{ + ASSERT(aiop->outcome != IOOpOutcomeInFlight); + switch (aiop->notify_type) { + case NotifyTSO: + { + /* We should be guaranteed that the tso is still on the same + * cap because the tso was not on the run queue of any cap and + * so is not subject to thread migration. + */ + StgTSO *tso = aiop->notify.tso; + ASSERT(tso->cap == iomgr->cap); + + /* Fill in the outcome and result/error on the TSO's stack frame */ + setTsoIOOpOutcome(tso, aiop->outcome, aiop->result); + pushOnRunQueue(iomgr->cap, tso); + RELEASE_STORE(&tso->why_blocked, NotBlocked); + + /* For the TSO case, the aiop was only reachable from the TSO + * itself, and thus it is now no longer be reachable at all. + */ + IF_NONMOVING_WRITE_BARRIER_ENABLED { + updateRemembSetPushClosure(iomgr->cap, (StgClosure *)aiop); + } + break; + } + case NotifyMVar: + barf("selectbis iomgr: MVar notification not yet supported"); + break; + + case NotifyTVar: + barf("selectbis iomgr: TVar notification not yet supported"); + break; + } +} + + +static bool processIOCompletions(CapIOManager *iomgr, int ncompletions) +{ + /* We want to find the intersection between the sets of ready fds returned + * by select() and the aiop_table. Given how select() represents + * things there's no particularly efficient way to do it. + * + * We just go through the whole aiop_table and look up each one in + * the read or write fd_set to see if they completed. Note that here is + * where we rely on the aiop_table being dense so we can iterate + * over the entries. We can short-cut if we hit the ncompletions before + * getting to the end of the table. + */ + debugTrace(DEBUG_iomanager, "processIOCompletions(ncompletions = %d)", + ncompletions); + + bool interrupt = false; +#if defined(HAVE_PREEMPTION) + /* If the interrupt_fd_r is ready, collect it */ + if (FD_ISSET(iomgr->interrupt_fd_r, iomgr->rfds)) { + collectFdWakeup(iomgr->interrupt_fd_r); + ncompletions--; + interrupt = true; + debugTrace(DEBUG_iomanager, "Received interrupt in poll I/O manager"); + } +#endif + + struct fd_table_entry *fd_table = iomgr->fd_table; + int n = ncompletions; + int i = 0; + while (n > 0) { + ASSERT(i < sizeClosureTable(&iomgr->aiop_table)); + + StgAsyncIOOp *aiop = indexClosureTable(&iomgr->aiop_table, i); + int fd = fd_table[i].fd; + IOReadOrWrite rw = fd_table[i].rw; + + ASSERT(aiop->outcome == IOOpOutcomeInFlight); + + if (rw == IORead ? FD_ISSET(fd, iomgr->rfds) + : FD_ISSET(fd, iomgr->wfds)) { + aiop->outcome = IOOpOutcomeSuccess; + aiop->result = 0; + removeFromTables(iomgr, i); + notifyIOCompletion(iomgr, aiop); + n--; + } else { + /* You'd expect incrementing the table index to be unconditional, + * but we don't increment the index if we did process the entry, + * because using removeFromTables means we'll move an entry from + * the end of the table into the index i. + */ + i++; + } + } + return interrupt; +} + + +void pollCompletedTimeoutsOrIOSelectBis(CapIOManager *iomgr) +{ + if (!isEmptyTimeoutQueue(iomgr->timeout_queue)) { + Time now = getProcessElapsedTime(); + processTimeoutCompletions(iomgr, now); + } + + if (!isEmptyClosureTable(&iomgr->aiop_table)) { + /* Prepare to poll for I/O readiness: collect all of the fd's that + * we're interested in. + */ + int maxfd = collectFdSets(iomgr); + + /* Poll for I/O readiness, without waiting. */ + struct timeval tv = (struct timeval) { .tv_sec = 0, .tv_usec = 0 }; + int res = select(maxfd+1, iomgr->rfds, iomgr->wfds, NULL, &tv); + if (res == 0) { + /* There is no I/O ready. We'll return to the scheduler. */ + + } else if (res > 0) { + int ncompletions = res; + ASSERT(ncompletions <= sizeClosureTable(&iomgr->aiop_table)+1); + processIOCompletions(iomgr, ncompletions); + + } else if (errno == EBADF) { + processBadFds(iomgr); + + } else if (errno == EINTR) { + /* We got interrupted by a signal. This is unlikely since we asked + * select() not to wait, but if so we'll return to the scheduler. + */ + + } else { + reportSelectError(); + } + } +} + + +bool awaitCompletedTimeoutsOrIOSelectBis(CapIOManager *iomgr) +{ + bool interrupt = false; /* got woken up via interruptIOManager */ + + /* Loop until we've woken up some threads. This loop is needed because the + * select() timing isn't accurate, we sometimes sleep for a while but not + * long enough to wake up a thread in a threadDelay. Or we may need to + * sleep multiple times if we need to sleep longer than the maximum timeout + * that select() supports. + */ + do { + /* There is either pending I/O or pending timers. */ + ASSERT(!isEmptyTimeoutQueue(iomgr->timeout_queue) || + !isEmptyClosureTable(&iomgr->aiop_table)); + + Time now = getProcessElapsedTime(); + processTimeoutCompletions(iomgr, now); + + /* If we didn't wake any threads due to expiring timeouts, then we need + * to wait on I/O. Or to put it another way, even if we did wake some + * threads, we'll still poll (but not wait) for I/O. This is to ensure + * we avoid starving threads blocked on I/O. + */ + bool wait = emptyRunQueue(iomgr->cap); + + /* Prepare to poll for I/O readiness: collect all of the fd's that + * we're interested in. + */ + int maxfd = collectFdSets(iomgr); + + /* Decide if we are going to wait if no I/O is ready, either: + * poll only, wait indefinitely, or wait until a timeout. + */ + struct timeval tv, *timeout_us; + timeout_us = timeoutInMicroseconds(iomgr, wait, now, &tv); + + /* Check for I/O readiness, possibly waiting. */ + int res = select(maxfd+1, iomgr->rfds, iomgr->wfds, NULL, timeout_us); + + if (res == 0) { + /* Success but there is no I/O ready. This can happen either if we + * were not blocking or were in a timed wait and the timeout + * occurred before any I/O became ready. Either way, the do-while + * loop condition will handle it. + */ + ASSERT(timeout_us != NULL); + + } else if (res > 0) { + int ncompletions = res; + ASSERT(ncompletions <= sizeClosureTable(&iomgr->aiop_table)+1); + interrupt = processIOCompletions(iomgr, ncompletions); + // FIXME: do we also need to check for timeout completions now? + // we have a non-empty queue, but if !wait then we have also moved + // on and so we sould check for timeouts. + + } else if (errno == EINTR) { + /* We got interrupted by a signal. In the non-threaded RTS, if the + * signal is one of ours we need to return to the scheduler to let + * it handle it. Otherwise we would loop and keep waiting for I/O + * or timeouts, meaning we would block for a long time before the + * signal is serviced. + */ +#if defined(RTS_USER_SIGNALS) + if (startPendingSignalHandlers(iomgr->cap)) break; +#endif + + /* We can also be interrupted by the shutdown signal handler, which + * will set sched_state and so cause us to drop out of the loop. + * + * For any other interruption (e.g. timer) we will go round the + * do-while loop again. + */ + + } else if (errno == EBADF) { + processBadFds(iomgr); + + } else { + reportSelectError(); + } + + } while (emptyRunQueue(iomgr->cap) + && !interrupt + && (getSchedState() == SCHED_RUNNING)); + return !interrupt; +} + + +static void reportSelectError(void) +{ + sysErrorBelch("select() failed"); + stg_exit(EXIT_FAILURE); +} + + +static void processBadFds(CapIOManager *iomgr) +{ + /* This is extremely tiresome. The select() call fails with EBADF if any + * fd is invalid (usually closed), but it does not tell us which one. + * So we have to loop through them to find the offending fd. + * + * This will only find the first bad fd, so the caller must cope with + * there still being bad fds after this. + */ + + fd_set rfds, wfds; + FD_ZERO(&rfds); + FD_ZERO(&wfds); + + struct fd_table_entry *fd_table = iomgr->fd_table; + int nentries = sizeClosureTable(&iomgr->aiop_table); + for (int n = 0; n < nentries; n++) { + int fd = fd_table[n].fd; + IOReadOrWrite rw = fd_table[n].rw; + + struct timeval tv = { .tv_sec = 0, .tv_usec = 0 }; + int res; + if (rw == IORead) { + FD_SET(fd, &rfds); + res = select(fd+1, &rfds, NULL, NULL, &tv); + FD_CLR(fd, &rfds); + } else { + FD_SET(fd, &wfds); + res = select(fd+1, NULL, &wfds, NULL, &tv); + FD_CLR(fd, &wfds); + } + if (res == 0) { + continue; + + } else if (errno == EBADF) { + StgAsyncIOOp *aiop = indexClosureTable(&iomgr->aiop_table, n); + aiop->outcome = IOOpOutcomeFailed; + aiop->error = EBADF; + removeFromTables(iomgr, n); + notifyIOCompletion(iomgr, aiop); + /* There is /probably/ only one bad fd at once, so we abort the + * search here. If we are unlucky and there are several bad fds + * then the caller will just loop round again. + */ + + return; + + } else if (errno == EINTR) { + /* Unlikely, since we did a non-blocking select(). Try again. */ + n--; + continue; + + } else { + reportSelectError(); + } + } +} + + +void interruptIOManagerSelectBis(CapIOManager *iomgr) +{ +#if defined(HAVE_PREEMPTION) + sendFdWakeup(iomgr->interrupt_fd_w); +#endif +} + + +/* Helper function to double the size of the aiop_table and fd_table. + */ +static bool enlargeTables(CapIOManager *iomgr) +{ + int oldcapacity = capacityClosureTable(&iomgr->aiop_table); + int newcapacity = (oldcapacity == 0) ? 1 : (oldcapacity * 2); + + bool ok = enlargeClosureTable(iomgr->cap, &iomgr->aiop_table, newcapacity); + if (RTS_UNLIKELY(!ok)) return false; + + /* Update the auxiliary fd_table to match */ + iomgr->fd_table = + stgReallocBytes(iomgr->fd_table, + sizeof(struct fd_table_entry) * newcapacity, + "SelectBis.c: enlargeTables"); + + /* Initialise the new part of the fd_table */ + struct fd_table_entry *fd_table = iomgr->fd_table; + for (int i = oldcapacity; i < newcapacity; i++) { + fd_table[i] = (struct fd_table_entry) { + .fd = -1, + .rw = 0 + }; + } + return true; +} + + +/* Remove from the completion table, preserving compactness, and apply the same + * compacting to the fd_table. + */ +static void removeFromTables(CapIOManager *iomgr, int ix) +{ + int ix_from; int ix_to; + removeCompactClosureTable(iomgr->cap, &iomgr->aiop_table, ix, + &ix_from, &ix_to); + if (ix_to != ix_from) { + StgAsyncIOOp *aiop_to = indexClosureTable(&iomgr->aiop_table, ix_to); + aiop_to->index = ix_to; + iomgr->fd_table[ix_to] = iomgr->fd_table[ix_from]; + iomgr->fd_table[ix_from] = (struct fd_table_entry) { + .fd = -1, + .rw = 0 + }; + } +} + + +static int collectFdSets(CapIOManager *iomgr) +{ + int maxfd = -1; + int nentries = sizeClosureTable(&iomgr->aiop_table); + struct fd_table_entry *fd_table = iomgr->fd_table; + + /* In principle we could optimise this slightly by not resetting the + * whole of each fdset, by assuming that select() does not modify + * entries above maxfd. This is probably not worth doing however, since + * this I/O manager is supposed to be portable and is expected to be slow. + */ + FD_ZERO(iomgr->rfds); + FD_ZERO(iomgr->wfds); + +#if defined(HAVE_PREEMPTION) + /* We're always interested in our interrupt fd */ + { + int fd = iomgr->interrupt_fd_r; + maxfd = (fd > maxfd) ? fd : maxfd; + FD_SET(fd, iomgr->rfds); + } +#endif + + for (int i = 0; i < nentries; i++) { + int fd = fd_table[i].fd; + IOReadOrWrite rw = fd_table[i].rw; + ASSERT(fd != -1); // uninitialised + + // Skip aiops that we already know are failed + StgAsyncIOOp *aiop = indexClosureTable(&iomgr->aiop_table, i); + if (RTS_UNLIKELY(aiop->outcome == IOOpOutcomeFailed)) continue; + + if (rw == IORead) { + FD_SET(fd, iomgr->rfds); + } else { + FD_SET(fd, iomgr->wfds); + } + maxfd = (fd > maxfd) ? fd : maxfd; + } + return maxfd; +} + + +/* Helper function to check if the fd is within range for select(). + */ +static bool fdInSelectRange(int fd) +{ + /* On older FreeBSDs, FD_SETSIZE is unsigned. Cast it to signed int + * in order to switch off the 'comparison between signed and + * unsigned error message + * Newer versions of FreeBSD have switched to unsigned int: + * https://github.com/freebsd/freebsd/commit/12ae7f74a071f0439763986026525094a… + * http://fa.freebsd.cvs-all.narkive.com/bCWNHbaC/svn-commit-r265051-head-sys-… + * So the (int) cast should be removed across the code base once + * GHC requires a version of FreeBSD that has that change in it. + */ + return ((fd >= 0) && (fd < (int)FD_SETSIZE)); + /* TODO: on several platforms, it is possible to use a larger fd set size. + For example on OSX: + https://code.saghul.net/2016/05/libuv-internals-the-osx-select2-trick/ + And probably similar on other platforms. It basically amounts to looking + through the representation abstraction of fd_set and to know that it is + indeed a bit set, and then we can simply allocate it and manipulte it + ourselves. We could do this, dynamically (re-)allocate the size. + */ +} + +#endif /* IOMGR_ENABLED_SELECTBIS */ ===================================== rts/posix/SelectBis.h ===================================== @@ -0,0 +1,62 @@ +/* ----------------------------------------------------------------------------- + * + * (c) The GHC Team 2020-2026 + * + * A second I/O manager based on the classic Unix select() system call. + * + * This I/O manager is called "selectbis", because it is the second such I/O + * manager based on select(). The historic implementation is named "select" + * and lives in Select.{c,h}. This I/O manager exists for the benefit of users + * of Apple products. + * + * The poll I/O manger _should_ be the portable baseline posix I/O manager. + * Unfortunately Mac OSX has a buggy implementation of poll(). The OSX man + * page documents this as: + * + * > BUGS The poll() system call currently does not support devices. + * + * This is quite incredible, given that poll and select should be relatively + * thin interfaces to the the same underlying kernel infrastructure. + * Furthermore, OSX is supposedly certified as POSIX compliant! Due to this + * (incompetence) we need a new I/O manager implementation based on the + * antique select() API, with all of its known limitations. + * + * Please direct all complaints to: + * Apple Inc., One Apple Park Way, Cupertino, CA 95014, USA. + * + * Prototypes for functions in SelectBis.c + * + * -------------------------------------------------------------------------*/ + +#pragma once + +#include "IOManager.h" + +#include "BeginPrivate.h" + +#if defined(IOMGR_ENABLED_SELECTBIS) + +void initCapabilityIOManagerSelectBis(CapIOManager *iomgr); +void freeCapabilityIOManagerSelectBis(CapIOManager *iomgr); + +/* Synchronous I/O and timer operations */ +IOSubmitResult syncIOWaitReadySelectBis(CapIOManager *iomgr, StgTSO *tso, + IOReadOrWrite rw, HsInt fd); +void syncIOCancelSelectBis(CapIOManager *iomgr, StgTSO *tso); + +/* Asynchronous operations */ +IOSubmitResult asyncIOWaitReadySelectBis(CapIOManager *iomgr, + StgAsyncIOOp *aiop, + IOReadOrWrite rw, int fd); +void asyncIOCancelSelectBis(CapIOManager *iomgr, StgAsyncIOOp *aiop); + +/* Scheduler operations */ +bool anyPendingTimeoutsOrIOSelectBis(CapIOManager *iomgr); +void pollCompletedTimeoutsOrIOSelectBis(CapIOManager *iomgr); +bool awaitCompletedTimeoutsOrIOSelectBis(CapIOManager *iomgr); +void interruptIOManagerSelectBis(CapIOManager *iomgr); + +#endif /* IOMGR_ENABLED_SELECTBIS */ + +#include "EndPrivate.h" + ===================================== rts/posix/Timeout.c ===================================== @@ -14,8 +14,9 @@ #include "Schedule.h" #include "Prelude.h" -#include "Timeout.h" +#include "IOManager.h" #include "IOManagerInternals.h" +#include "Timeout.h" #include "TimeoutQueue.h" #include <limits.h> @@ -24,7 +25,8 @@ /* Currently only used by the poll I/O manager, but in future may be used by several in-RTS I/O managers. */ -#if defined(IOMGR_ENABLED_POLL) +#if defined(IOMGR_ENABLED_SELECTBIS) \ + || defined(IOMGR_ENABLED_POLL) bool syncDelayTimeout(CapIOManager *iomgr, StgTSO *tso, HsInt us_delay) { @@ -68,14 +70,13 @@ void syncDelayCancelTimeout(CapIOManager *iomgr, StgTSO *tso) deleteTimeoutQueue(&iomgr->timeout_queue, timeout); + appendToRunQueue(iomgr->cap, tso); + RELEASE_STORE(&tso->why_blocked, NotBlocked); + /* the timeout is no longer accessible from anywhere (except here) */ IF_NONMOVING_WRITE_BARRIER_ENABLED { updateRemembSetPushClosure(iomgr->cap, (StgClosure *)timeout); } - - /* We don't put the TSO back on the run queue or change the why_blocked - status, as that is done by removeFromQueues (in the throwTo* functions). - */ } static void notifyTimeoutCompletion(CapIOManager *iomgr, StgTimeout *timeout); @@ -222,5 +223,58 @@ struct timespec *timeoutInNanoseconds(CapIOManager *iomgr, bool wait, } #endif -#endif // defined(IOMGR_ENABLED_POLL) +/* select() expect a timeout in microseconds, using struct timeval * with + * special values of NULL for indefinite wait, and 0 for no waiting. + */ +#if defined(IOMGR_ENABLED_SELECTBIS) +struct timeval *timeoutInMicroseconds(CapIOManager *iomgr, bool wait, + Time now, struct timeval *tv) +{ + if (!wait) { + /* Don't wait, just poll. */ + *tv = (struct timeval) { .tv_sec = 0, .tv_usec = 0 }; + return tv; + + } else if (!isEmptyTimeoutQueue(iomgr->timeout_queue)) { + /* SUSv2 allows implementations to have an implementation defined + * maximum timeout for select(2). The standard requires + * implementations to silently truncate values exceeding this maximum + * to the maximum. Unfortunately, OSX and the BSD don't comply with + * SUSv2, instead opting to return EINVAL for values exceeding a + * timeout of 1e8. + * + * Select returning an error crashes the runtime in a bad way. To + * play it safe we truncate any timeout to 31 days, as SUSv2 requires + * any implementations maximum timeout to be larger than this. + * + * Truncating the timeout is not an issue, because if nothing + * interesting happens when the timeout expires, we'll see that the + * thread still wants to be blocked longer and simply block on a new + * iteration of select(2). + */ + const time_t max_seconds = 2678400; // 31 * 24 * 60 * 60 + + Time waketime = findMinWaketimeTimeoutQueue(iomgr->timeout_queue); + Time waittime = waketime - now; + + /* Any expired timeouts should have been cleared, so we must be waiting + * for a timeout in the future. */ + ASSERT(waittime > 0); + + tv->tv_sec = TimeToSeconds(waittime); + if (tv->tv_sec < max_seconds) { + tv->tv_usec = TimeToUS(waittime) % 1000000; + } else { + tv->tv_sec = max_seconds; + tv->tv_usec = 0; + } + return tv; + + } else { + return NULL; + } +} +#endif + +#endif // defined(IOMGR_ENABLED_POLL) || ... etc ===================================== rts/posix/Timeout.h ===================================== @@ -46,5 +46,15 @@ struct timespec *timeoutInNanoseconds(CapIOManager *iomgr, bool wait, Time now, struct timespec *tv); #endif +/* As above, but a timeout in microseconds. This is intended to be used with + * select() which expect struct timespec *, with special values of NULL for + * indefinite wait, and 0 for no waiting. + */ +#if defined(IOMGR_ENABLED_SELECTBIS) +struct timeval *timeoutInMicroseconds(CapIOManager *iomgr, bool wait, + Time now, struct timeval *tv); + +#endif + #include "EndPrivate.h" ===================================== rts/rts.cabal ===================================== @@ -568,6 +568,7 @@ library wasm/JSFFI.c wasm/JSFFIGlobals.c posix/Select.c + posix/SelectBis.c posix/Poll.c posix/Timeout.c cmm-sources: wasm/jsval.cmm @@ -583,6 +584,7 @@ library posix/MIO.c posix/Poll.c posix/Select.c + posix/SelectBis.c posix/Signals.c posix/Timeout.c posix/TTY.c ===================================== testsuite/tests/interface-stability/ghc-experimental-exports.stdout ===================================== @@ -7861,7 +7861,7 @@ module GHC.RTS.Flags.Experimental where type HpcFlags :: * data HpcFlags = HpcFlags {readTixFile :: GHC.Internal.Types.Bool, writeTixFile :: GHC.Internal.Types.Bool} type IoManagerFlag :: * - data IoManagerFlag = IoManagerFlagAuto | IoManagerFlagSelect | IoManagerFlagPoll | IoManagerFlagMIO | IoManagerFlagWinIO | IoManagerFlagWin32Legacy + data IoManagerFlag = IoManagerFlagAuto | IoManagerFlagSelect | IoManagerFlagSelectBis | IoManagerFlagPoll | IoManagerFlagMIO | IoManagerFlagWinIO | IoManagerFlagWin32Legacy type IoSubSystem :: * data IoSubSystem = IoPOSIX | IoNative type MiscFlags :: * ===================================== testsuite/tests/interface-stability/ghc-experimental-exports.stdout-mingw32 ===================================== @@ -7864,7 +7864,7 @@ module GHC.RTS.Flags.Experimental where type HpcFlags :: * data HpcFlags = HpcFlags {readTixFile :: GHC.Internal.Types.Bool, writeTixFile :: GHC.Internal.Types.Bool} type IoManagerFlag :: * - data IoManagerFlag = IoManagerFlagAuto | IoManagerFlagSelect | IoManagerFlagPoll | IoManagerFlagMIO | IoManagerFlagWinIO | IoManagerFlagWin32Legacy + data IoManagerFlag = IoManagerFlagAuto | IoManagerFlagSelect | IoManagerFlagSelectBis | IoManagerFlagPoll | IoManagerFlagMIO | IoManagerFlagWinIO | IoManagerFlagWin32Legacy type IoSubSystem :: * data IoSubSystem = IoPOSIX | IoNative type MiscFlags :: * View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/31a44a61b4254f052599140a6fdcca… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/31a44a61b4254f052599140a6fdcca… You're receiving this email because of your account on gitlab.haskell.org. 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[Git][ghc/ghc][wip/substitution-via-mapper] 17 commits: Reorder cmm decls in HeapStackCheck for a better logical grouping
by Simon Peyton Jones (＠simonpj) 11 Sep '26

11 Sep '26

Simon Peyton Jones pushed to branch wip/substitution-via-mapper at Glasgow Haskell Compiler / GHC Commits: 430967ab by Duncan Coutts at 2026-09-09T11:07:01+01:00 Reorder cmm decls in HeapStackCheck for a better logical grouping And put more section headers in to deliniate the groups. We're about to add more here, so better to organise it first. - - - - - 344080fd by Duncan Coutts at 2026-09-09T11:07:01+01:00 Add raisePrimIOException and add it to RTS<->ghc-internal API The raisePrimIOException is a new helper function that I/O primops will use to help them report I/O errors. This is implemented in Haskell (since that's a lot easier), but has a calling convention that is easy(ish) to use from Cmm in the I/O primops. So we add it to the RTS API struct, and since we'll use it from Cmm we also need a field accessor macro for cmm (in deriveConstants). See the Note about how we cannot have nice things due to async exceptions and thunks preventing us from using catch. - - - - - cfdb3399 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Add new blocking functions for I/O primops See the Note [Thread blocking for new I/O primops], and the Note [Calling convention for raisePrimIOException]. The point is, it will allow us to report synchronous exceptions from I/O primops, and do so much more flexibly. Previously the I/O managers could only report async exceptions and only nullary exceptions. This was OK historically, but no good as we add more I/O managers and expand the range of I/O operations we support. - - - - - f09c09d8 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Change the encoding of results from the I/O manager to I/O primops Previously we just had async continue or heap overflow. We now extend what we can report with synchronous success, and synchronous failure with an errno. See Note [Encoding of result of I/O manager operations] We don't use these two new cases yet, but we will. In particular an epoll I/O manager needs to be able to report synchronous success or failure for waitRead#/waitWrite#. - - - - - 30f074d9 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Switch waitRead/Write# to use new blocking return frames and update the I/O managers to set the result before resuming the blocked threads. This makes it possible for I/O managers to report synchronous exceptions from the I/O primops, but that will be done in a subsequent commit. - - - - - a8786ced by Duncan Coutts at 2026-09-09T11:07:01+01:00 Switch Poll and Select I/O managers to report sync exceptions rather than using raiseAsync with blockedOnBadFD_closure. This uses the new mechanism in the blocking frame return code to report synchronous exceptions. - - - - - 7a9df79a by Duncan Coutts at 2026-09-09T11:07:01+01:00 Remove now-unused blockedOnBadFD It was previously thrown by the select and poll I/O managers, but now they use raisePrimIOException (with an EBADF errno). - - - - - 6b0424e3 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Improve the docs for delay# waitRead# and waitWrite# Document that the waitRead/Write# can throw exceptions (this was true before too), and that all of them are async exception cancellation points. - - - - - afeb2c30 by Duncan Coutts at 2026-09-09T20:08:58-04:00 Enable printf warnings for trace functions and fix resulting warnings Most of the existing printf-style functions are annotated with attributes to enable gcc/clang warnings for the printf format string, but several trace functions in Trace.h were missing this annotation. Enable them, and fix the resulting warnings. - - - - - 9a442c93 by Alan Zimmerman at 2026-09-09T20:09:36-04:00 EPA: Exact print ConDeclGADT without custom enterAnn !16321 brought in explicit capture of parens in a ConDeclGADT. The ExactPrint update introduced a modification of the fundamental function in exact printing, `enterAnn`, by splitting it into a version allowing injection of functionality normally handled by the ExactPrint class methods. This commit refactors that code, to restore the prior `enterAnn` version, by following the convention in ExactPrint of introducing a helper data structure with its own `ExactPrint` instance to achieve the same effect. - - - - - 2168462f by Simon Peyton Jones at 2026-09-10T17:31:49+01:00 Try using TyCoMapper for substitutions - - - - - d4ee89b1 by Simon Peyton Jones at 2026-09-10T17:31:49+01:00 Implement substitution via TyCoMapper This is a significant bit of refactoring. The dependencies look like this, where each module depends on one above Defines Needs --------------------------------------------------- GHC.Core.TyCo.Rep Type, Coercion TyCoFolder GHC.Core.TyCo.FVs Free-var finders TyCoFolder GHC.Core.TyCo.Make Lots of mkX functions Free vars TyCoMapper GHC.Core.TyCo.Subst Substitution TyCoMapper, mkX functions GHC.Core.Type coreView, typeKind Substitution coercionKind GHC.Core.TyCo.Compare Comparison coreView Some `mkX` functions (such as `mkLRCo`, `mkInstCo`, `mkCastTy`) use substitution, and so are defined in GHC.Core.Type via a hs-boot import. - - - - - 9d88c7ba by Simon Peyton Jones at 2026-09-10T17:31:49+01:00 Make substitution strict It's nice that it is so easy to do so - - - - - 98f18698 by Simon Peyton Jones at 2026-09-10T17:31:49+01:00 Wibbles - - - - - dd2e2a2e by Simon Peyton Jones at 2026-09-10T17:31:49+01:00 Wibbles - - - - - 9bd8afe1 by Simon Peyton Jones at 2026-09-10T17:31:49+01:00 Wibble imports - - - - - b4812d8b by Simon Peyton Jones at 2026-09-10T17:31:49+01:00 Wibbles - - - - - 71 changed files: - compiler/GHC/Builtin/WiredIn/Prim.hs - compiler/GHC/Builtin/primops.txt.pp - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/Coercion.hs-boot - compiler/GHC/Core/Reduction.hs - compiler/GHC/Core/Seq.hs - compiler/GHC/Core/TyCo/FVs.hs - + compiler/GHC/Core/TyCo/Make.hs - + compiler/GHC/Core/TyCo/Make.hs-boot - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCo/Rep.hs-boot - compiler/GHC/Core/TyCo/Subst.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Type.hs-boot - compiler/GHC/Driver/Main/Compile.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Stg/EnforceEpt/TagSig.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/TyCl.hs - compiler/GHC/Tc/Utils/Unify.hs - compiler/GHC/Tc/Zonk/TcType.hs - compiler/GHC/Tc/Zonk/Type.hs - compiler/GHC/Types/Arity.hs - compiler/GHC/Types/Basic.hs - compiler/GHC/Types/Cpr.hs - compiler/GHC/Types/Demand.hs - compiler/GHC/Types/Name/Env.hs - compiler/GHC/Types/Name/Occurrence.hs - compiler/GHC/Types/Unique/FM.hs - compiler/GHC/Types/Unique/Map.hs - compiler/GHC/Types/Unique/Set.hs - compiler/GHC/Types/Var/Set.hs - compiler/GHC/Utils/Binary.hs - compiler/GHC/Utils/Outputable.hs - + compiler/GHC/Utils/StrictIdentity.hs - compiler/ghc.cabal.in - libraries/ghc-internal/include/RtsIfaceSymbols.h - libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs - libraries/ghc-internal/src/GHC/Internal/Event/Thread.hs - rts/Capability.c - rts/HeapStackCheck.cmm - rts/IOManager.c - rts/IOManager.h - rts/IOManagerInternals.h - rts/Messages.c - rts/Prelude.h - rts/PrimOps.cmm - rts/Printer.c - rts/STM.c - rts/Schedule.c - rts/Sparks.c - rts/StableName.c - rts/ThreadPaused.c - rts/Threads.c - rts/Trace.h - rts/include/rts/RtsToHsIface.h - rts/include/stg/MiscClosures.h - rts/posix/Poll.c - rts/posix/Poll.h - rts/posix/Select.c - rts/posix/Timeout.c - rts/sm/Compact.c - rts/sm/GC.c - rts/sm/GCUtils.c - rts/sm/MBlock.c - rts/sm/NonMoving.c - rts/sm/NonMovingMark.c - rts/sm/Storage.c - rts/sm/Sweep.c - utils/check-exact/ExactPrint.hs - utils/deriveConstants/Main.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/6646c67ab3c35d6804e4930baabba1… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/6646c67ab3c35d6804e4930baabba1… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/T27731] Simplify the cec_supress story
by Simon Peyton Jones (＠simonpj) 11 Sep '26

11 Sep '26

Simon Peyton Jones pushed to branch wip/T27731 at Glasgow Haskell Compiler / GHC Commits: 61ba8455 by Simon Peyton Jones at 2026-09-10T17:19:32+01:00 Simplify the cec_supress story In particular stop trying to predict if we will report a serious error in the future. Still needs some work on documentation. - - - - - 1 changed file: - compiler/GHC/Tc/Errors.hs Changes: ===================================== compiler/GHC/Tc/Errors.hs ===================================== @@ -256,21 +256,16 @@ report_unsolved type_errors expr_holes ; warn_redundant <- woptM Opt_WarnRedundantConstraints ; exp_syns <- goptM Opt_PrintExpandedSynonyms - ; let err_ctxt = CEC { cec_encl = [] - , cec_tidy = tidy_env - , cec_defer_type_errors = type_errors - , cec_expr_holes = expr_holes - , cec_type_holes = type_holes + ; let err_ctxt = CEC { cec_encl = [] + , cec_tidy = tidy_env + , cec_defer_type_errors = type_errors + , cec_expr_holes = expr_holes + , cec_type_holes = type_holes , cec_out_of_scope_holes = out_of_scope_holes - , cec_suppress = insolubleWC wanted - -- See (SLIE1) in - -- Note [cec_suppress: suppressing less-important error messages] - -- Suppress low-priority errors if there are insoluble errors - -- anywhere in the treee. See #15539 and c.f. setting ic_status - -- in GHC.Tc.Solver.setImplicationStatus - , cec_warn_redundant = warn_redundant - , cec_expand_syns = exp_syns - , cec_binds = binds_var } + , cec_suppress = False + , cec_warn_redundant = warn_redundant + , cec_expand_syns = exp_syns + , cec_binds = binds_var } ; tc_lvl <- getTcLevel ; reportWanteds err_ctxt tc_lvl wanted @@ -689,7 +684,7 @@ reportWanteds ctxt tc_lvl wc@(WC { wc_simple = simples, wc_impl = implics -- Don't suppress holes or concreteness errors unless we have scope errors ; reportHoles tidy_items ctxt_for_insols other_holes - ; reportNotConcreteErrs ctxt_for_insols not_conc_errs + ; reportNotConcreteErrs ctxt_for_insols not_conc_errs -- We only want to report multiplicity coercion errors for multiplicity -- constraints which are /solved/ with a non-reflexivity coercion. We @@ -699,27 +694,28 @@ reportWanteds ctxt tc_lvl wc@(WC { wc_simple = simples, wc_impl = implics ; when (null simples) $ reportMultiplicityCoercionErrs ctxt_for_insols mult_co_errs - -- Now the main batch of utterly-wrong things + -- Now the constraints that give serious errors -- Like Int ~ Bool (incl nullary TyCons) -- or Int ~ t a (AppTy on one side) - ; (ctxt1, items1) <- tryReporters ctxt_for_insols report1 tidy_items - - -- Now all the other constraints. We suppress errors here if - -- any of the first batch failed (ctxt1), or if the enclosing context - -- says to suppress AND there are local insolubles that are all suppressed. - -- See (SLIE3) in Note [cec_suppress: suppressing less-important error messages] - ; let insols = filter ei_insoluble tidy_items - all_insols_suppressed | null insols = False - | otherwise = all ei_suppress insols - ctxt2 = ctxt1 { cec_suppress = (cec_suppress ctxt && not all_insols_suppressed) - || cec_suppress ctxt1 } - ; (_, leftovers) <- tryReporters ctxt2 report2 items1 + ; (items1, no_serious_errs) + <- askNoErrs $ + tryReporters ctxt_for_insols serious_reporters tidy_items + + -- Now take account of the inherited cec_suppress, and augment it + -- to suppress further errors if we have found any serious errors locally + ; let suppress_for_rest = cec_suppress ctxt + || not no_out_of_scope + || not no_serious_errs + ctxt_for_rest = ctxt { cec_suppress = suppress_for_rest } + + -- Next, deal with the less-serious constraints + ; leftovers <- tryReporters ctxt_for_rest less_serious_reporters items1 ; massertPpr (null leftovers) (text "The following unsolved Wanted constraints \ \have not been reported to the user:" $$ ppr leftovers) - ; mapBagM_ (reportImplic ctxt2) implics + ; mapBagM_ (reportImplic ctxt_for_rest) implics -- NB ctxt2: don't suppress inner insolubles if there's only a -- wanted insoluble here; but do suppress inner insolubles -- if there's a *given* insoluble here (= inaccessible code) @@ -745,59 +741,58 @@ reportWanteds ctxt tc_lvl wc@(WC { wc_simple = simples, wc_impl = implics DE_Multiplicity mult_co loc -> (es1, es2, es3, (mult_co, loc):es4) - -- report1: ones that should *not* be suppressed by cec_suppress, - -- (i.e. by an insoluble somewhere else in the tree) - -- It's crucial that anything that is considered insoluble - -- (see GHC.Tc.Utils.insolublWantedCt) is caught here, otherwise - -- we might suppress its error message, and proceed on past - -- type checking to get a Lint error later - report1 = [ -- We put implicit lifting errors first, because are solid errors - -- See "Implicit lifting" in GHC.Tc.Gen.Splice - -- Note [Lifecycle of an untyped splice, and PendingRnSplice] - ("implicit lifting", is_implicit_lifting, True, mkImplicitLiftingReporter) - - -- Next, solid equality errors - , given_eq_spec - , ("insoluble2", utterly_wrong, True, mkGroupReporter mkEqErr) - , ("skolem eq1", very_wrong, True, mkSkolReporter) - , ("FixedRuntimeRep", is_FRR, True, mkGroupReporter mkFRRErr) - , ("skolem eq2", skolem_eq, True, mkSkolReporter) - - -- Next, custom type errors - -- See Note [Custom type errors in constraints] in GHC.Tc.Types.Constraint - -- - -- Put custom type errors /after/ solid equality errors. In #26255 we - -- had a custom error (T <= F alpha) which was suppressing a far more - -- informative (K Int ~ [K alpha]). That mismatch between K and [] is - -- definitely wrong; and if it was fixed we'd know alpha:=Int, and hence - -- perhaps be able to solve T <= F alpha, by reducing F Int. - -- - -- But put custom type errors /before/ "non-tv eq", because if we have - -- () ~ TypeError blah - -- we want to report it as a custom error, /not/ as a mis-match - -- between TypeError and ()! Also see the Assert example - -- in Note [Custom type errors in constraints] - , ("custom_error", is_user_type_error, True, mkUserTypeErrorReporter) - -- (Handles TypeError and Unsatisfiable) - - -- "non-tv-eq": equalities (ty1 ~ ty2) where ty1 is not a tyvar - , ("non-tv eq", non_tv_eq, True, mkSkolReporter) - - -- The only remaining equalities are alpha ~ ty, - -- where alpha is untouchable; and representational equalities - -- Prefer homogeneous equalities over hetero, because the - -- former might be holding up the latter. - -- See Note [Equalities with heterogeneous kinds] in GHC.Tc.Solver.Equality - , ("Homo eqs", is_homo_equality, True, mkGroupReporter mkEqErr) - , ("Other eqs", is_equality, True, mkGroupReporter mkEqErr) - - , ("Insoluble fundeps", is_insoluble, True, mkGroupReporter mkDictErr) - ] - - -- report2: we suppress these if there are insolubles elsewhere in the tree - report2 = [ ("Irreds", is_irred, False, mkGroupReporter mkIrredErr) - , ("Dicts", is_dict, False, mkGroupReporter mkDictErr) - , ("Quantified", is_qc, False, mkGroupReporter mkQCErr) ] + --serious_reporters: ones that should *not* be suppressed by cec_suppress, + -- (i.e. by an insoluble somewhere else in the tree) + serious_reporters + = [ -- We put implicit lifting errors first, because are solid errors + -- See "Implicit lifting" in GHC.Tc.Gen.Splice + -- Note [Lifecycle of an untyped splice, and PendingRnSplice] + ("implicit lifting", is_implicit_lifting, True, mkImplicitLiftingReporter) + + -- Next, solid equality errors + , given_eq_spec + , ("insoluble2", utterly_wrong, True, mkGroupReporter mkEqErr) + , ("skolem eq1", very_wrong, True, mkSkolReporter) + , ("FixedRuntimeRep", is_FRR, True, mkGroupReporter mkFRRErr) + , ("skolem eq2", skolem_eq, True, mkSkolReporter) + + -- Next, custom type errors + -- See Note [Custom type errors in constraints] in GHC.Tc.Types.Constraint + -- + -- Put custom type errors /after/ solid equality errors. In #26255 we + -- had a custom error (T <= F alpha) which was suppressing a far more + -- informative (K Int ~ [K alpha]). That mismatch between K and [] is + -- definitely wrong; and if it was fixed we'd know alpha:=Int, and hence + -- perhaps be able to solve T <= F alpha, by reducing F Int. + -- + -- But put custom type errors /before/ "non-tv eq", because if we have + -- () ~ TypeError blah + -- we want to report it as a custom error, /not/ as a mis-match + -- between TypeError and ()! Also see the Assert example + -- in Note [Custom type errors in constraints] + , ("custom_error", is_user_type_error, True, mkUserTypeErrorReporter) + -- (Handles TypeError and Unsatisfiable) + + -- "non-tv-eq": equalities (ty1 ~ ty2) where ty1 is not a tyvar + , ("non-tv eq", non_tv_eq, True, mkSkolReporter) + + -- The only remaining equalities are alpha ~ ty, + -- where alpha is untouchable; and representational equalities + -- Prefer homogeneous equalities over hetero, because the + -- former might be holding up the latter. + -- See Note [Equalities with heterogeneous kinds] in GHC.Tc.Solver.Equality + , ("Homo eqs", is_homo_equality, True, mkGroupReporter mkEqErr) + , ("Other eqs", is_equality, True, mkGroupReporter mkEqErr) + + , ("Insoluble fundeps", is_insoluble, True, mkGroupReporter mkDictErr) + ] + + -- less_serious_reporters: we suppress these if have already + -- reported a serious error, higher in the tree + less_serious_reporters + = [ ("Irreds", is_irred, False, mkGroupReporter mkIrredErr) + , ("Dicts", is_dict, False, mkGroupReporter mkDictErr) + , ("Quantified", is_qc, False, mkGroupReporter mkQCErr) ] -- rigid_nom_eq, rigid_nom_tv_eq, is_dict, is_equality, is_FRR, is_irred :: ErrorItem -> Pred -> Bool @@ -1310,14 +1305,16 @@ cmp_loc item1 item2 = get item1 `compare` get item2 reportGroup :: (NonEmpty ErrorItem -> TcM SolverReport) -> Reporter reportGroup mk_err ctxt items - = do { err <- mk_err items + = do { traceTc "reportGroup" (ppr items) + ; err <- mk_err items ; traceTc "About to maybeReportErr" $ vcat [ text "Constraint:" <+> ppr items , text "cec_suppress =" <+> ppr (cec_suppress ctxt) , text "cec_defer_type_errors =" <+> ppr (cec_defer_type_errors ctxt) ] + ; maybeReportError ctxt items err -- But see Note [Always warn with -fdefer-type-errors] - ; traceTc "reportGroup" (ppr items) + ; mapM_ (addSolverDeferredBinding err) items } -- Add deferred bindings for all -- Redundant if we are going to abort compilation, @@ -1431,39 +1428,36 @@ mkErrorTerm ct_loc ty ctxt msg supp hints ; return $ evDelayedError ty err_str } tryReporters :: SolverReportErrCtxt -> [ReporterSpec] -> [ErrorItem] - -> TcM (SolverReportErrCtxt, [ErrorItem]) + -> TcM [ErrorItem] -- Use the first reporter in the list whose predicate says True tryReporters ctxt reporters items = do { let (vis_items, invis_items) = partition (isVisibleOrigin . errorItemOrigin) items ; traceTc "tryReporters {" (ppr vis_items $$ ppr invis_items) - ; (ctxt', items') <- go ctxt reporters vis_items invis_items + ; items' <- go reporters vis_items invis_items ; traceTc "tryReporters }" (ppr items') - ; return (ctxt', items') } + ; return items' } where - go ctxt [] vis_items invis_items - = return (ctxt, vis_items ++ invis_items) + go [] vis_items invis_items + = return (vis_items ++ invis_items) - go ctxt (r : rs) vis_items invis_items + go (r : rs) vis_items invis_items -- Always look at *visible* Origins before invisible ones -- this is the whole point of isVisibleOrigin - = do { (ctxt', vis_items') <- tryReporter ctxt r vis_items - ; (ctxt'', invis_items') <- tryReporter ctxt' r invis_items - ; go ctxt'' rs vis_items' invis_items' } + = do { vis_items' <- tryReporter ctxt r vis_items + ; invis_items' <- tryReporter ctxt r invis_items + ; go rs vis_items' invis_items' } -- Carry on with the rest, because we must make -- deferred bindings for them if we have -fdefer-type-errors -- But suppress their error messages -tryReporter :: SolverReportErrCtxt -> ReporterSpec -> [ErrorItem] -> TcM (SolverReportErrCtxt, [ErrorItem]) -tryReporter ctxt (str, keep_me, suppress_after, reporter) items = case nonEmpty yeses of - Nothing -> pure (ctxt, items) +tryReporter :: SolverReportErrCtxt -> ReporterSpec -> [ErrorItem] -> TcM [ErrorItem] +tryReporter ctxt (str, keep_me, _, reporter) items = case nonEmpty yeses of + Nothing -> return items Just yeses -> do { traceTc "tryReporter{ " (text str <+> ppr yeses) - ; (_, no_errs) <- askNoErrs (reporter ctxt yeses) - ; let suppress_now = not no_errs && suppress_after - -- See (SLIE2) in Note [cec_suppress: suppressing less-important error messages] - ctxt' = ctxt { cec_suppress = suppress_now || cec_suppress ctxt } - ; traceTc "tryReporter end }" (text str <+> ppr (cec_suppress ctxt) <+> ppr suppress_after <+> ppr (cec_suppress ctxt')) - ; return (ctxt', nos) } + ; reporter ctxt yeses + ; traceTc "tryReporter end }" empty + ; return nos } where (yeses, nos) = partition keep items keep item = keep_me item (classifyPredType (errorItemPred item)) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/61ba8455d7c15d1f098d4d7b24d7180… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/61ba8455d7c15d1f098d4d7b24d7180… You're receiving this email because of your account on gitlab.haskell.org. 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[Git][ghc/ghc][wip/T27724] Complete the noinline story
by Simon Peyton Jones (＠simonpj) 11 Sep '26

11 Sep '26

Simon Peyton Jones pushed to branch wip/T27724 at Glasgow Haskell Compiler / GHC Commits: 5b405cd7 by Simon Peyton Jones at 2026-09-10T17:08:46+01:00 Complete the noinline story - - - - - 12 changed files: - compiler/GHC/Builtin/WiredIn/Ids.hs - compiler/GHC/Builtin/WiredIn/Prim.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/Type.hs - compiler/GHC/CoreToIface.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/HsToCore.hs - compiler/GHC/Tc/Instance/Class.hs - libraries/ghc-internal/src/GHC/Internal/Magic.hs - testsuite/tests/corelint/LintEtaExpand.hs - utils/genprimopcode/Main.hs Changes: ===================================== compiler/GHC/Builtin/WiredIn/Ids.hs ===================================== @@ -18,13 +18,16 @@ module GHC.Builtin.WiredIn.Ids ( wiredInIds, ghcPrimIds, realWorldPrimId, voidPrimId, voidArgId, - nullAddrId, seqId, lazyId, lazyIdKey, - coercionTokenId, coerceId, - proxyHashId, + nullAddrId, seqId, lazyId, lazyIdKey, proxyHashId, + coercionTokenId, coerceId, coerceName, nospecId, nospecIdName, - noinlineId, noinlineIdName, - noinlineConstraintId, noinlineConstraintIdName, - coerceName, leftSectionName, rightSectionName, + + getNoinlineId, isNoinlineId, + noinlineId, noinlineIdName, + noinlineConstraintId, noinlineConstraintIdName, + + leftSectionName, rightSectionName, + pcRepPolyId, unboxedUnitExpr, @@ -54,11 +57,14 @@ import GHC.Types.Name.Env import GHC.Types.Id import GHC.Types.Id.Info import GHC.Types.InlinePragma -import GHC.Types.Var (VarBndr(Bndr), visArgConstraintLike, tyVarName) +import GHC.Types.Var (VarBndr(Bndr), invisArgConstraintLike, tyVarName) +import GHC.Types.Basic( TypeOrConstraint(..) ) import GHC.Tc.Types.Origin import GHC.Tc.Utils.TcType as TcType +import GHC.Utils.Panic +import GHC.Utils.Outputable import GHC.Data.FastString @@ -92,7 +98,7 @@ that module's interface file; instead, the full definition is right here. Note [ghcPrimIds (aka pseudoops)] -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The ghcPrimIds * Are exported from GHC.Prim (see ghcPrimExports, used in ghcPrimInterface) @@ -239,15 +245,15 @@ seqId = pcRepPolyId seqName ty concs info -- seq :: forall (r :: RuntimeRep) a (b :: TYPE r). a -> b -> b ty = mkInfForAllTy runtimeRep2TyVar - $ mkSpecForAllTys [alphaTyVar, openBetaTyVar] - $ mkVisFunTyMany alphaTy (mkVisFunTyMany openBetaTy openBetaTy) + $ mkSpecForAllTys [alphaTyVar, rrPolyTyVar2] + $ mkVisFunTyMany alphaTy (mkVisFunTyMany rrPolyTy2 rrPolyTy2) - [x,y] = mkTemplateLocals [alphaTy, openBetaTy] - rhs = mkLams ([runtimeRep2TyVar, alphaTyVar, openBetaTyVar, x, y]) $ - Case (Var x) x openBetaTy [Alt DEFAULT [] (Var y)] + [x,y] = mkTemplateLocals [rrPolyTy1, rrPolyTy2] + rhs = mkLams ([runtimeRep2TyVar, alphaTyVar, rrPolyTyVar2, x, y]) $ + Case (Var x) x rrPolyTy2 [Alt DEFAULT [] (Var y)] concs = mkRepPolyIdConcreteTyVars - [ ((openBetaTy, mkArgPos 2 Top), runtimeRep2TyVar)] + [ ((rrPolyTy2, mkArgPos 2 Top), runtimeRep2TyVar)] arity = 2 @@ -271,15 +277,27 @@ noinlineId = pcMiscPrelId noinlineIdName ty info info = noCafIdInfo -- noinline :: forall r (a :: TYPE r). a -> a ty = mkInfForAllTy runtimeRep1TyVar $ - mkSpecForAllTys [openAlphaTyVar] $ - mkVisFunTyMany openAlphaTy openAlphaTy + mkSpecForAllTys [rrPolyTyVar1] $ + mkVisFunTyMany rrPolyTy1 rrPolyTy1 noinlineConstraintId :: Id -- See Note [noinlineId magic] noinlineConstraintId = pcMiscPrelId noinlineConstraintIdName ty info where info = noCafIdInfo - ty = mkSpecForAllTys [alphaConstraintTyVar] $ - mkFunTy visArgConstraintLike ManyTy alphaTy alphaConstraintTy + ty = mkInfForAllTy runtimeRep1TyVar $ + mkSpecForAllTys [rrPolyConstraintVar1] $ + mkFunTy invisArgConstraintLike ManyTy rrPolyConstraintTy1 rrPolyConstraintTy1 + +isNoinlineId :: Id -> Bool +isNoinlineId fn = key == noinlineIdKey || key == noinlineConstraintIdKey + where + key = getUnique fn + +getNoinlineId :: Type -> (Id, RuntimeRepType) +getNoinlineId ty = case sORTKind_maybe (typeKind ty) of + Just (TypeLike, rep) -> (noinlineId, rep) + Just (ConstraintLike, rep) -> (noinlineConstraintId, rep) + Nothing -> pprPanic "getNoinlineId" (ppr ty) ------------------------------------------------ nospecId :: Id -- See Note [nospecId magic] @@ -296,19 +314,19 @@ oneShotId = pcRepPolyId oneShotName ty concs info `setArityInfo` arity -- oneShot :: forall {r1 r2} (a :: TYPE r1) (b :: TYPE r2). (a -> b) -> (a -> b) ty = mkInfForAllTys [ runtimeRep1TyVar, runtimeRep2TyVar ] $ - mkSpecForAllTys [ openAlphaTyVar, openBetaTyVar ] $ + mkSpecForAllTys [ rrPolyTyVar1, rrPolyTyVar2 ] $ mkVisFunTyMany fun_ty fun_ty - fun_ty = mkVisFunTyMany openAlphaTy openBetaTy - [body, x] = mkTemplateLocals [fun_ty, openAlphaTy] + fun_ty = mkVisFunTyMany rrPolyTy1 rrPolyTy2 + [body, x] = mkTemplateLocals [fun_ty, rrPolyTy1] x' = setOneShotLambda x -- Here is the magic bit! rhs = mkLams [ runtimeRep1TyVar, runtimeRep2TyVar - , openAlphaTyVar, openBetaTyVar + , rrPolyTyVar1, rrPolyTyVar2 , body, x'] $ Var body `App` Var x' arity = 2 concs = mkRepPolyIdConcreteTyVars - [((openAlphaTy, mkArgPos 2 Top), runtimeRep1TyVar)] + [((rrPolyTy1, mkArgPos 2 Top), runtimeRep1TyVar)] ---------------------------------------------------------------------- {- Note [Wired-in Ids for rebindable syntax] @@ -340,20 +358,20 @@ leftSectionId = pcRepPolyId leftSectionName ty concs info `setUnfoldingInfo` mkCompulsoryUnfolding rhs `setArityInfo` arity ty = mkInfForAllTys [runtimeRep1TyVar,runtimeRep2TyVar, multiplicityTyVar1] $ - mkSpecForAllTys [openAlphaTyVar, openBetaTyVar] $ + mkSpecForAllTys [rrPolyTyVar1, rrPolyTyVar2] $ exprType body - [f,x] = mkTemplateLocals [mkVisFunTy mult openAlphaTy openBetaTy, openAlphaTy] + [f,x] = mkTemplateLocals [mkVisFunTy mult rrPolyTy1 rrPolyTy2, rrPolyTy1] mult = mkTyVarTy multiplicityTyVar1 :: Mult xmult = setIdMult x mult rhs = mkLams [ runtimeRep1TyVar, runtimeRep2TyVar, multiplicityTyVar1 - , openAlphaTyVar, openBetaTyVar ] body + , rrPolyTyVar1, rrPolyTyVar2 ] body body = mkLams [f,xmult] $ App (Var f) (Var xmult) arity = 2 concs = mkRepPolyIdConcreteTyVars - [((openAlphaTy, mkArgPos 2 Top), runtimeRep1TyVar)] + [((rrPolyTy1, mkArgPos 2 Top), runtimeRep1TyVar)] -- See Note [Left and right sections] in GHC.Rename.Expr -- See Note [Wired-in Ids for rebindable syntax] @@ -369,26 +387,26 @@ rightSectionId = pcRepPolyId rightSectionName ty concs info `setArityInfo` arity ty = mkInfForAllTys [runtimeRep1TyVar,runtimeRep2TyVar,runtimeRep3TyVar , multiplicityTyVar1, multiplicityTyVar2 ] $ - mkSpecForAllTys [openAlphaTyVar, openBetaTyVar, openGammaTyVar ] $ + mkSpecForAllTys [rrPolyTyVar1, rrPolyTyVar2, rrPolyTyVar3] $ exprType body mult1 = mkTyVarTy multiplicityTyVar1 mult2 = mkTyVarTy multiplicityTyVar2 - [f,x,y] = mkTemplateLocals [ mkScaledFunTys [ Scaled mult1 openAlphaTy - , Scaled mult2 openBetaTy ] openGammaTy - , openAlphaTy, openBetaTy ] + [f,x,y] = mkTemplateLocals [ mkScaledFunTys [ Scaled mult1 rrPolyTy1 + , Scaled mult2 rrPolyTy2 ] rrPolyTy3 + , rrPolyTy1, rrPolyTy2 ] xmult = setIdMult x mult1 ymult = setIdMult y mult2 rhs = mkLams [ runtimeRep1TyVar, runtimeRep2TyVar, runtimeRep3TyVar , multiplicityTyVar1, multiplicityTyVar2 - , openAlphaTyVar, openBetaTyVar, openGammaTyVar ] body + , rrPolyTyVar1, rrPolyTyVar2, rrPolyTyVar3 ] body body = mkLams [f,ymult,xmult] $ mkVarApps (Var f) [xmult,ymult] arity = 3 concs = mkRepPolyIdConcreteTyVars - [ ((openAlphaTy, mkArgPos 3 Top), runtimeRep1TyVar) - , ((openBetaTy , mkArgPos 2 Top), runtimeRep2TyVar)] + [ ((rrPolyTy1, mkArgPos 3 Top), runtimeRep1TyVar) + , ((rrPolyTy2, mkArgPos 2 Top), runtimeRep2TyVar)] -------------------------------------------------------------------------------- @@ -521,55 +539,55 @@ Implementing 'lazy' is a bit tricky: Note [noinlineId magic] ~~~~~~~~~~~~~~~~~~~~~~~ -'noinline' is used to make sure that a function f is never inlined, -e.g., as in 'noinline f x'. We won't inline f because we never inline -lone variables (see Note [Lone variables] in GHC.Core.Unfold +'noinline' is used to make sure that a function f is never inlined, e.g + noinline f x + noinline (f x) +Both of these will work. Here are the moving parts: -You might think that we could implement noinline like this: - {-# NOINLINE #-} - noinline :: forall a. a -> a - noinline x = x +* `noinline` is magic Id (see Note [magicIds]), whose wired-in behaviour is + defined in this module, GHC.Builtin.WiredIn.Ids. -But actually we give 'noinline' a wired-in name for three distinct reasons: +* In the Simplifier, see the `isNoInlineId` case of `simplOutId`. + When we encounter noinline (f e1 e2) e3 e4: + * We switch off inlining before simplifying `f` (#18995) + * We slide `e3` and `e4` under the `noinline` to give + noinline (f e1 e2 e3 e4) + See wrinkle (NOI1) -1. We don't want to leave a (useless) call to noinline in the final program, - to be executed at runtime. So we have a little bit of magic to - optimize away 'noinline' after we are done running the simplifier. - This is done in GHC.CoreToStg.Prep.cpeApp. - -2. 'noinline' sometimes gets inserted automatically when we serialize an - expression to the interface format, in GHC.CoreToIface.toIfaceVar. - See Note [Inlining and hs-boot files] in GHC.CoreToIface - -3. Given foo :: Eq a => [a] -> Bool, the expression - noinline foo x xs - where x::Int, will naturally desugar to - noinline @Int (foo @Int dEqInt) x xs - But now it's entirely possible that (foo @Int dEqInt) will inline foo, - since 'foo' is no longer a lone variable -- see #18995 - - Solution: in the desugarer, rewrite - noinline (f x y) ==> noinline f x y - This is done in the `noinlineId` case of `GHC.HsToCore.Expr.ds_app_var` - This is only needed for noinlineId, not noInlineConstraintId (wrinkle - (W1) below), because the latter never shows up in user code. +* In GHC.CoreToStg.Prep.cpe_app, we discard the `noinline`, so that + there is no runtime overhead. Wrinkles -(W1) Sometimes case (2) above needs to apply `noinline` to a type of kind +(NOI1) It's very important to have + noinline (f e1 e2) -- `f` visibly applied + and NOT + noinline f e1 e2 -- `f` is not applied + Because we want + * Strictness (#18396, #23911, #16588) + * Type-class specialisation (#27724) + * Rewrite rules + all to work, and they won't if `f` isn't applied to anything + +(NOI2) `noinline` needs to apply to unboxed types, so that + noinline (f x y) + works even if `f` happens to return Int#. So + noinline :: forall (r::RuntimeRep) (a::TYPE r). a -> a + +(NOI3) Very trickily, 'noinline' sometimes gets inserted automatically when we + serialize an expression to the interface format, in `GHC.CoreToIface.toIfaceVar`. + See Note [Inlining and hs-boot files] in GHC.CoreToIface + +(NOI4) Sometimes case (NOI3) needs to apply `noinline` to a type of kind Constraint; e.g. noinline @(Eq Int) $dfEqInt - We don't have type-or-kind polymorphism, so we simply have two `inline` - Ids, namely `noinlineId` and `noinlineConstraintId`. - -(W2) Note that noinline as currently implemented can hide some simplifications - since it hides strictness from the demand analyser. Specifically, the - demand analyser will treat 'noinline f x' as lazy in 'x', even if the - demand signature of 'f' specifies that it is strict in its argument. We - considered fixing this this by adding a special case to the demand - analyser to address #16588. However, the special case seemed like a large - and expensive hammer to address a rare case and consequently we rather - opted to use a more minimal solution. + We don't have type-or-constraint polymorphism, so we simply have two + `inline` Ids, namely `noinlineId` and `noinlineConstraintId`: + + noinline :: forall (r::RuntimeRep) (a::TYPE r). a -> a + noinlineConstraint :: forall (r::RuntimeRep) (a::CONSTRAINT r). a => a + + Tiresome but simple. Note [nospecId magic] ~~~~~~~~~~~~~~~~~~~~~ ===================================== compiler/GHC/Builtin/WiredIn/Prim.hs ===================================== @@ -32,10 +32,13 @@ module GHC.Builtin.WiredIn.Prim( alphaConstraintTyVar, alphaConstraintTy, - openAlphaTyVar, openBetaTyVar, openGammaTyVar, - openAlphaTyVarSpec, openBetaTyVarSpec, openGammaTyVarSpec, - openAlphaTy, openBetaTy, openGammaTy, + -- Runtime-rep-polymorphic tyvars, of kind (TYPE rr) + rrPolyTyVar1, rrPolyTyVar2, rrPolyTyVar3, + rrPolyTy1, rrPolyTy2, rrPolyTy3, + rrPolyTyVarSpec1, rrPolyTyVarSpec2, rrPolyTyVarSpec3, + rrPolyConstraintVar1, rrPolyConstraintTy1, + -- Levity-polymorphic tyvars levPolyAlphaTyVar, levPolyBetaTyVar, levPolyAlphaTyVarSpec, levPolyBetaTyVarSpec, levPolyAlphaTy, levPolyBetaTy, @@ -503,24 +506,29 @@ runtimeRep1Ty, runtimeRep2Ty, runtimeRep3Ty :: RuntimeRepType runtimeRep1Ty = mkTyVarTy runtimeRep1TyVar runtimeRep2Ty = mkTyVarTy runtimeRep2TyVar runtimeRep3Ty = mkTyVarTy runtimeRep3TyVar -openAlphaTyVar, openBetaTyVar, openGammaTyVar :: TyVar --- alpha :: TYPE r1 --- beta :: TYPE r2 --- gamma :: TYPE r3 -[openAlphaTyVar,openBetaTyVar,openGammaTyVar] + +rrPolyTyVar1, rrPolyTyVar2, rrPolyTyVar3, rrPolyConstraintVar1 :: TyVar +-- rrPolyTyVar1 :: TYPE r1 +-- rrPolyTyVar2 :: TYPE r2 +-- rrPolyTyVar2 :: TYPE r3 +-- rrPolyConstraintVar1 :: CONSTRAINT r1 +-- All have distinct uniques +[ rrPolyTyVar1, rrPolyTyVar2, rrPolyTyVar3, rrPolyConstraintVar1 ] = mkTemplateTyVars [ mk_TYPE_app runtimeRep1Ty , mk_TYPE_app runtimeRep2Ty - , mk_TYPE_app runtimeRep3Ty] - -openAlphaTyVarSpec, openBetaTyVarSpec, openGammaTyVarSpec :: TyVarBinder -openAlphaTyVarSpec = mkTyVarBinder Specified openAlphaTyVar -openBetaTyVarSpec = mkTyVarBinder Specified openBetaTyVar -openGammaTyVarSpec = mkTyVarBinder Specified openGammaTyVar - -openAlphaTy, openBetaTy, openGammaTy :: Type -openAlphaTy = mkTyVarTy openAlphaTyVar -openBetaTy = mkTyVarTy openBetaTyVar -openGammaTy = mkTyVarTy openGammaTyVar + , mk_TYPE_app runtimeRep3Ty + , mk_CONSTRAINT_app runtimeRep1Ty ] + +rrPolyTyVarSpec1, rrPolyTyVarSpec2, rrPolyTyVarSpec3 :: TyVarBinder +rrPolyTyVarSpec1 = mkTyVarBinder Specified rrPolyTyVar1 +rrPolyTyVarSpec2 = mkTyVarBinder Specified rrPolyTyVar2 +rrPolyTyVarSpec3 = mkTyVarBinder Specified rrPolyTyVar3 + +rrPolyTy1, rrPolyTy2, rrPolyTy3, rrPolyConstraintTy1 :: Type +rrPolyTy1 = mkTyVarTy rrPolyTyVar1 +rrPolyTy2 = mkTyVarTy rrPolyTyVar2 +rrPolyTy3 = mkTyVarTy rrPolyTyVar3 +rrPolyConstraintTy1 = mkTyVarTy rrPolyConstraintVar1 levity1TyVar, levity2TyVar :: TyVar (levity2TyVar : levity1TyVar : _) -- NB: levity2TyVar before levity1TyVar ===================================== compiler/GHC/Core/Opt/Simplify/Iteration.hs ===================================== @@ -60,8 +60,8 @@ import GHC.Types.Tickish import GHC.Types.Var ( isTyCoVar ) import GHC.Builtin.WiredIn.Prim( realWorldStatePrimTy ) -import GHC.Builtin.KnownKeys( runRWKey, seqHashKey, noinlineIdKey ) -import GHC.Builtin.WiredIn.Ids( seqId ) +import GHC.Builtin.KnownKeys( runRWKey, seqHashKey ) +import GHC.Builtin.WiredIn.Ids( seqId, getNoinlineId, isNoinlineId ) import qualified GHC.Data.List.Infinite as Inf import GHC.Data.Maybe ( isNothing, orElse, mapMaybe ) @@ -2369,8 +2369,8 @@ simplOutId env fun cont call' = mkApps (Var fun) [mkTyArg rr', mkTyArg new_runrw_res_ty, arg'] ; rebuild_go env call' outer_cont } -simplOutId env inline_fun cont - | inline_fun `hasKey` noinlineIdKey +simplOutId env noinline_fun cont + | isNoinlineId noinline_fun , ApplyToTy { sc_cont = cont1 } <- cont , ApplyToTy { sc_cont = cont2 } <- cont1 , ApplyToVal { sc_cont = cont3, sc_arg = the_call, sc_cast = arg_mco @@ -2386,10 +2386,12 @@ simplOutId env inline_fun cont ; let call_env = updMode updModeForNoInline $ arg_se `setInScopeFromE` env ; (floats1, call') <- simplExprF call_env inner_fun call_cont - ; let new_call_ty = contHoleType rest_cont - noinline_expr = Var inline_fun `App` Type (getRuntimeRep new_call_ty) - `App` Type new_call_ty - `App` mkCastMCo call' arg_mco + ; let new_call_ty = contHoleType rest_cont + (new_noinline_fun, rep) = getNoinlineId new_call_ty + noinline_expr = Var new_noinline_fun + `App` Type rep + `App` Type new_call_ty + `App` mkCastMCo call' arg_mco ; (floats2, res) <- rebuild env noinline_expr rest_cont ; return (floats2 `addFloats` floats1 , res) } ===================================== compiler/GHC/Core/TyCo/Rep.hs ===================================== @@ -114,7 +114,8 @@ type KindOrType = Type -- See Note [Arguments to type constructors] -- | The key type representing kinds in the compiler. type Kind = Type --- | Type synonym used for types of kind RuntimeRep. +-- | Type synonym used for Types of kind RuntimeRep. +-- E.g. The type IntRep :: RuntimeRep type RuntimeRepType = Type -- | Type synonym used for types of kind Levity. ===================================== compiler/GHC/Core/Type.hs ===================================== @@ -2686,7 +2686,7 @@ typeKind ty@(ForAllTy {}) --------------------------------------------- -sORTKind_maybe :: Kind -> Maybe (TypeOrConstraint, Type) +sORTKind_maybe :: Kind -> Maybe (TypeOrConstraint, RuntimeRepType) -- Sees if the argument is of form (TYPE rep) or (CONSTRAINT rep) -- and if so returns which, and the runtime rep -- ===================================== compiler/GHC/CoreToIface.hs ===================================== @@ -63,7 +63,7 @@ import GHC.Core.TyCo.Tidy import GHC.Builtin.WiredIn.Prim ( eqPrimTyCon, eqReprPrimTyCon ) import GHC.Builtin.WiredIn.Types ( heqTyCon ) -import GHC.Builtin.WiredIn.Ids ( noinlineIdName ) +import GHC.Builtin.WiredIn.Ids ( getNoinlineId ) import GHC.Iface.Syntax import GHC.Data.FastString @@ -658,9 +658,9 @@ toIfaceVar :: Id -> IfaceExpr toIfaceVar v | isBootUnfolding (idUnfolding v) = -- See Note [Inlining and hs-boot files] - IfaceExt noinlineIdName `IfaceApp` - IfaceType (toIfaceType rep) `IfaceApp` - IfaceType (toIfaceType ty) `IfaceApp` + IfaceExt (idName noinline_id) `IfaceApp` + IfaceType (toIfaceType rep) `IfaceApp` + IfaceType (toIfaceType ty) `IfaceApp` IfaceExt name -- Don't use mkIfaceApps, or infinite loop | Just fcall <- isFCallId_maybe v = IfaceFCall fcall (toIfaceType (idType v)) @@ -671,7 +671,7 @@ toIfaceVar v where name = idName v ty = idType v - rep = getRuntimeRep ty + (noinline_id, rep) = getNoinlineId ty --------------------- toIfaceLFInfo :: Name -> LambdaFormInfo -> IfaceLFInfo @@ -750,7 +750,7 @@ But how do we arrange for this to happen? There are two ingredients: 1. When we serialize out unfoldings to IfaceExprs (toIfaceVar), for every variable reference we see if we are referring to an 'Id' that came from an hs-boot file. If so, we add a `noinline` - to the reference. See Note [noinlineId magic] + to the reference. See Note [noinlineId magic] esp (NOI3) in GHC.Types.Id.Make 2. But how do we know if a reference came from an hs-boot file ===================================== compiler/GHC/CoreToStg/Prep.hs ===================================== @@ -28,7 +28,7 @@ import GHC.Builtin.PrimOps import GHC.Builtin.PrimOps.Ids import GHC.Builtin.WiredIn.Types import GHC.Builtin.WiredIn.Prim -import GHC.Builtin.WiredIn.Ids ( realWorldPrimId ) +import GHC.Builtin.WiredIn.Ids ( realWorldPrimId, isNoinlineId ) import GHC.Core.Utils import GHC.Core.Opt.Arity @@ -1274,7 +1274,7 @@ eliminateMagicCall f (AIApp Type{} : AIApp arg : args) -- See Note [nospecId magic] in GHC.Types.Id.Make eliminateMagicCall f (AIApp Type{} : AIApp Type{} : AIApp arg : args) - | f `hasKey` noinlineIdKey = Just (arg,args) + | isNoinlineId f = Just (arg,args) -- Replace (noinline a) with a -- See Note [noinlineId magic] in GHC.Types.Id.Make ===================================== compiler/GHC/HsToCore.hs ===================================== @@ -706,8 +706,10 @@ patchMagicDefn orig_pair@(orig_id, orig_rhs) = do { magic_pair@(magic_id, _) <- mk_magic_pair orig_id orig_rhs -- Patching should not change the Name or the type of the Id - ; massert (getUnique magic_id == getUnique orig_id) - ; massert (varType magic_id `eqType` varType orig_id) + ; massertPpr (getUnique magic_id == getUnique orig_id) (ppr orig_id) + ; massertPpr (varType magic_id `eqType` varType orig_id) $ + vcat [ text "orig_id:" <+> ppr orig_id <+> dcolon <+> ppr (varType orig_id) + , text "magic_id:" <+> ppr magic_id <+> dcolon <+> ppr (varType magic_id) ] ; return magic_pair } | otherwise @@ -752,7 +754,7 @@ mkUnsafeCoercePrimPair _old_id old_expr ; let [unsafe_refl_data_con] = tyConDataCons unsafe_equality_tc rhs = mkLams [ runtimeRep1TyVar, runtimeRep2TyVar - , openAlphaTyVar, openBetaTyVar + , rrPolyTyVar1, rrPolyTyVar2 , x ] $ mkSingleAltCase scrut1 (mkWildValBinder ManyTy scrut1_ty) @@ -765,7 +767,7 @@ mkUnsafeCoercePrimPair _old_id old_expr Var x `mkCast` x_co [x, rr_cv, ab_cv] = mkTemplateLocals - [ openAlphaTy -- x :: a + [ rrPolyTy1 -- x :: a , rr_cv_ty -- rr_cv :: r1 ~# r2 , ab_cv_ty -- ab_cv :: (alpha |> alpha_co ~# beta) ] @@ -783,15 +785,15 @@ mkUnsafeCoercePrimPair _old_id old_expr runtimeRep1Ty runtimeRep2Ty (scrut2, scrut2_ty, ab_cv_ty) = unsafe_equality (mkTYPEapp runtimeRep2Ty) - (openAlphaTy `mkCastTy` alpha_co) - openBetaTy + (rrPolyTy1 `mkCastTy` alpha_co) + rrPolyTy2 -- alpha_co :: TYPE r1 ~# TYPE r2 -- alpha_co = TYPE rr_cv alpha_co = mkTyConAppCo Nominal tYPETyCon [mkCoVarCo rr_cv] -- x_co :: alpha ~R# beta - x_co = mkGReflMCo Representational openAlphaTy alpha_co `mkTransCo` + x_co = mkGReflMCo Representational rrPolyTy1 alpha_co `mkTransCo` mkSubCo (mkCoVarCo ab_cv) @@ -800,13 +802,13 @@ mkUnsafeCoercePrimPair _old_id old_expr `setArityInfo` arity ty = mkSpecForAllTys [ runtimeRep1TyVar, runtimeRep2TyVar - , openAlphaTyVar, openBetaTyVar ] $ - mkVisFunTyMany openAlphaTy openBetaTy + , rrPolyTyVar1, rrPolyTyVar2 ] $ + mkVisFunTyMany rrPolyTy1 rrPolyTy2 arity = 1 concs = mkRepPolyIdConcreteTyVars - [((mkTyVarTy openAlphaTyVar, mkArgPos 1 Top), runtimeRep1TyVar)] + [((rrPolyTy1, mkArgPos 1 Top), runtimeRep1TyVar)] unsafeCoercePrimName id = mkExportedLocalId (RepPolyId concs) unsafeCoercePrimName ty `setIdInfo` info ===================================== compiler/GHC/Tc/Instance/Class.hs ===================================== @@ -443,7 +443,7 @@ matchWithDict [cls_ty, mty] , Just (cls, dict_dc) <- isUnaryClassTyCon_maybe dict_tc , [inst_meth_ty] <- dataConInstArgTys dict_dc dict_args = do { sv <- mkSysLocalM (fsLit "withDict_s") ManyTy mty - ; k <- mkSysLocalM (fsLit "withDict_k") ManyTy (mkInvisFunTy cls_ty openAlphaTy) + ; k <- mkSysLocalM (fsLit "withDict_k") ManyTy (mkInvisFunTy cls_ty rrPolyTy1) ; wd_cls <- tcLookupKnownKeyClass withDictClassKey -- Given ev_expr : mty ~N# inst_meth_ty, construct the method of @@ -452,7 +452,7 @@ matchWithDict [cls_ty, mty] -- \@(r :: RuntimeRep) @(a :: TYPE r) (sv :: mty) (k :: cls => a) -> -- k (MkC tys (sv |> sub co2)) ; let evWithDict ev_expr - = mkCoreLams [ runtimeRep1TyVar, openAlphaTyVar, sv, k ] $ + = mkCoreLams [ runtimeRep1TyVar, rrPolyTyVar1, sv, k ] $ Var k `App` (evUnaryDictAppE cls dict_args meth_arg) where meth_arg = Var sv `mkCast` mkSubCo (evExprCoercion ev_expr) ===================================== libraries/ghc-internal/src/GHC/Internal/Magic.hs ===================================== @@ -62,9 +62,14 @@ inline x = x -- | The call @noinline f@ arranges that @f@ will not be inlined. -- It is removed during CorePrep so that its use imposes no overhead -- (besides the fact that it blocks inlining.) -noinline :: a -> a -{-# NOINLINE noinline #-} -- noinline is inlined manually in CorePrep -noinline x = x +noinline :: forall (r :: RuntimeRep) (a :: TYPE r). + a -> a +{-# NOINLINE noinline #-} +-- See Note [noinlineId magic] in GHC.Builtin.WiredIn.Ids +noinline = noinline -- Never called, eliminated in CorePrep + -- We can't conveniently call `error` here because + -- GHC.Internal.Err depends on GHC.Internal.Magic.noinline! + -- Hence this silly loop. -- | The 'lazy' function restrains strictness analysis a little. The -- call @lazy e@ means the same as @e@, but 'lazy' has a magical ===================================== testsuite/tests/corelint/LintEtaExpand.hs ===================================== @@ -28,7 +28,7 @@ import GHC.Builtin.PrimOps.Ids ( primOpId ) import GHC.Builtin.WiredIn.Prim ( runtimeRep1Ty, runtimeRep1TyVar - , openAlphaTy, openAlphaTyVar + , rrPolyTyVar1, rrPolyTy1 ) import GHC.Core @@ -79,7 +79,7 @@ test_exprs = [ Type liftedDataConTy , Type liftedRepTy , Type intTy - , Type $ mkVisFunTyMany openAlphaTy openAlphaTy + , Type $ mkVisFunTyMany rrPolyTy1 rrPolyTy1 ] , ("raise# OK 2", ) $ -- raise# @Lifted @r @@ -107,7 +107,7 @@ test_exprs = -- These will be considered in-scope by the Core Lint checks. in_scope :: [ Id ] -in_scope = [ runtimeRep1TyVar, openAlphaTyVar ] +in_scope = [ runtimeRep1TyVar, rrPolyTyVar1 ] main :: IO () main = do ===================================== utils/genprimopcode/Main.hs ===================================== @@ -751,15 +751,16 @@ ppTyVar "a" = nonDepTyVarBinder "alphaTyVarSpec" ppTyVar "b" = nonDepTyVarBinder "betaTyVarSpec" ppTyVar "c" = nonDepTyVarBinder "gammaTyVarSpec" ppTyVar "s" = nonDepTyVarBinder "deltaTyVarSpec" + -- See Note [Levity and representation polymorphic primops] in primops.txt.pp ppTyVar "a_reppoly" = PrimOpTyVarBinder { inferredTyVarBinders = ["runtimeRep1TyVarInf"] - , primOpTyVarBinder = "openAlphaTyVarSpec" } + , primOpTyVarBinder = "rrPolyTyVarSpec1" } ppTyVar "b_reppoly" = PrimOpTyVarBinder { inferredTyVarBinders = ["runtimeRep2TyVarInf"] - , primOpTyVarBinder = "openBetaTyVarSpec" } + , primOpTyVarBinder = "rrPolyTyVarSpec2" } ppTyVar "a_levpoly" = PrimOpTyVarBinder { inferredTyVarBinders = ["levity1TyVarInf"] @@ -802,8 +803,8 @@ ppType (TyVar "b") = "betaTy" ppType (TyVar "c") = "gammaTy" ppType (TyVar "s") = "deltaTy" -- See Note [Levity and representation polymorphic primops] in primops.txt.pp -ppType (TyVar "a_reppoly") = "openAlphaTy" -ppType (TyVar "b_reppoly") = "openBetaTy" +ppType (TyVar "a_reppoly") = "rrPolyTy1" +ppType (TyVar "b_reppoly") = "rrPolyTy2" ppType (TyVar "a_levpoly") = "levPolyAlphaTy" ppType (TyVar "b_levpoly") = "levPolyBetaTy" View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/5b405cd7ed126c62a9568e3682e93a4… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/5b405cd7ed126c62a9568e3682e93a4… You're receiving this email because of your account on gitlab.haskell.org. 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[Git][ghc/ghc][wip/fendor/full-eventlog-live] 2 commits: Support for `eventlog-socket`
by Wen Kokke (＠wenkokke) 10 Sep '26

10 Sep '26

Wen Kokke pushed to branch wip/fendor/full-eventlog-live at Glasgow Haskell Compiler / GHC Commits: 15866323 by Matthew Pickering at 2026-09-10T14:42:07+01:00 Support for `eventlog-socket` This adds the +eventlog-socket feature flag. If set, GHC is instrumented with Eventlog Socket. - - - - - 41ed3d90 by fendor at 2026-09-10T14:58:26+01:00 Support for `ghc-stack-profiler` This adds the +ghc-stack-profiler feature flag. If set, GHC is instrumented with GHC Stack Profiler. - - - - - 11 changed files: - .gitmodules - + eventlog-socket - + ghc-stack-profiler - ghc/Main.hs - ghc/ghc-bin.cabal.in - hadrian/src/Packages.hs - hadrian/src/Settings/Default.hs - hadrian/src/Settings/Packages.hs - + libraries/async - + libraries/hashable - + libraries/unordered-containers Changes: ===================================== .gitmodules ===================================== @@ -122,3 +122,18 @@ [submodule "libraries/libffi-clib"] path = libraries/libffi-clib url = https://gitlab.haskell.org/ghc/libffi-clib.git +[submodule "eventlog-socket"] + path = eventlog-socket + url = https://github.com/well-typed/eventlog-socket.git +[submodule "ghc-stack-profiler"] + path = ghc-stack-profiler + url = https://github.com/well-typed/ghc-stack-profiler +[submodule "libraries/async"] + path = libraries/async + url = https://github.com/fendor/async.git +[submodule "libraries/unordered-containers"] + path = libraries/unordered-containers + url = https://github.com/fendor/unordered-containers.git +[submodule "libraries/hashable"] + path = libraries/hashable + url = https://github.com/fendor/hashable ===================================== eventlog-socket ===================================== @@ -0,0 +1 @@ +Subproject commit 57ca65170bf6d264a284a047f3cb350d498fc256 ===================================== ghc-stack-profiler ===================================== @@ -0,0 +1 @@ +Subproject commit 389d886a1494cd019ee93c72c8f19cf7f9dc1664 ===================================== ghc/Main.hs ===================================== @@ -93,6 +93,28 @@ import Data.List ( isPrefixOf, partition, intercalate ) import Prelude import qualified Data.List.NonEmpty as NE +#if defined(EVENTLOG_SOCKET) +import qualified GHC.Eventlog.Socket +#endif + +#if defined(GHC_STACK_PROFILER) +import qualified GHC.Stack.Profiler +#endif + +startEventlogSocketFromEnv :: IO () +#if defined(EVENTLOG_SOCKET) +startEventlogSocketFromEnv = GHC.Eventlog.Socket.startFromEnv +#else +startEventlogSocketFromEnv = pure () +#endif + +startGhcStackProfilerFromEnv :: IO () +#if defined(GHC_STACK_PROFILER) +startGhcStackProfilerFromEnv = void GHC.Stack.Profiler.startProfilerFromEnv +#else +startGhcStackProfilerFromEnv = pure () +#endif + ----------------------------------------------------------------------------- -- ToDo: @@ -107,6 +129,9 @@ import qualified Data.List.NonEmpty as NE main :: IO () main = do + startEventlogSocketFromEnv + startGhcStackProfilerFromEnv + hSetBuffering stdout LineBuffering hSetBuffering stderr LineBuffering ===================================== ghc/ghc-bin.cabal.in ===================================== @@ -27,11 +27,21 @@ Flag interpreter Default: False Manual: True +Flag eventlog-socket + Description: Build with support for eventlog-socket + Default: False + Manual: True + Flag threaded Description: Link the ghc executable against the threaded RTS Default: True Manual: True +Flag ghc-stack-profiler + Description: Build with support for ghc-stack-profiler + Default: False + Manual: True + Executable ghc Default-Language: GHC2024 @@ -93,6 +103,14 @@ Executable ghc if flag(threaded) ghc-options: -threaded + if flag(eventlog-socket) + build-depends: eventlog-socket + CPP-OPTIONS: -DEVENTLOG_SOCKET + + if flag(ghc-stack-profiler) + build-depends: ghc-stack-profiler + CPP-OPTIONS: -DGHC_STACK_PROFILER + Other-Extensions: CPP NondecreasingIndentation ===================================== hadrian/src/Packages.hs ===================================== @@ -12,7 +12,9 @@ module Packages ( runGhc, semaphoreCompat, stm, templateHaskell, thLift, thQuasiquoter, terminfo, text, time, timeout, transformers, unlit, unix, win32, xhtml, lintersCommon, lintNotes, lintCodes, lintCommitMsg, lintSubmoduleRefs, lintWhitespace, + eventlogSocket, eventlogSocketControl, ghcPackages, isGhcPackage, + async, hashable, unorderedContainers, ghc_stack_profiler, ghc_stack_profiler_core, -- * Package information crossPrefix, programBasename, programName, nonHsMainPackage, programPath, timeoutPath, @@ -41,8 +43,11 @@ ghcPackages = , parsec, pretty, process, rts, runGhc, stm, semaphoreCompat, templateHaskell, thLift, thQuasiquoter , terminfo, text, time, transformers, unlit, unix, win32, xhtml, fileio , timeout + , eventlogSocketControl, eventlogSocket , lintersCommon - , lintNotes, lintCodes, lintCommitMsg, lintSubmoduleRefs, lintWhitespace ] + , lintNotes, lintCodes, lintCommitMsg, lintSubmoduleRefs, lintWhitespace + , async, hashable, unorderedContainers, ghc_stack_profiler_core, ghc_stack_profiler + ] -- TODO: Optimise by switching to sets of packages. isGhcPackage :: Package -> Bool @@ -58,7 +63,8 @@ array, base, binary, bytestring, cabalSyntax, cabal, changelogD, checkPpr, check osString, parsec, pretty, primitive, process, rts, runGhc, semaphoreCompat, stm, templateHaskell, thLift, thQuasiquoter, terminfo, text, time, transformers, unlit, unix, win32, xhtml, timeout, - lintersCommon, lintNotes, lintCodes, lintCommitMsg, lintSubmoduleRefs, lintWhitespace + lintersCommon, lintNotes, lintCodes, lintCommitMsg, lintSubmoduleRefs, lintWhitespace, + eventlogSocket, eventlogSocketControl :: Package array = lib "array" base = lib "base" @@ -134,6 +140,13 @@ unlit = util "unlit" unix = lib "unix" win32 = lib "Win32" xhtml = lib "xhtml" +eventlogSocket = lib "eventlog-socket" `setPath` "eventlog-socket/eventlog-socket" +eventlogSocketControl = lib "eventlog-socket-control" `setPath` "eventlog-socket/eventlog-socket-control" +async = lib "async" +hashable = lib "hashable" +unorderedContainers = lib "unordered-containers" +ghc_stack_profiler = lib "ghc-stack-profiler" `setPath` "ghc-stack-profiler/ghc-stack-profiler" +ghc_stack_profiler_core = lib "ghc-stack-profiler-core" `setPath` "ghc-stack-profiler/ghc-stack-profiler-core" lintersCommon = lib "linters-common" `setPath` "linters/linters-common" lintNotes = linter "lint-notes" ===================================== hadrian/src/Settings/Default.hs ===================================== @@ -110,6 +110,8 @@ stage0Packages = do , thQuasiquoter -- new library not yet present for boot compilers , unlit , xhtml -- new version is not backwards compat with latest + , eventlogSocket + , eventlogSocketControl , if windowsHost then win32 else unix -- We must use the in-tree `Win32` as the version -- bundled with GHC 9.6 is too old for `semaphore-compat`. @@ -190,6 +192,11 @@ stagedPackages stage = do , hpcBin , if winTarget then win32 else unix , runGhc + , ghc_stack_profiler + , ghc_stack_profiler_core + , async + , hashable + , unorderedContainers ] , when (winTarget && not cross) [ -- See Note [Hadrian's ghci-wrapper package] ===================================== hadrian/src/Settings/Packages.hs ===================================== @@ -105,6 +105,22 @@ packageArgs = do , builder (Haddock BuildPackage) ? arg ("--optghc=-I" ++ path) ] + , package ghc_stack_profiler ? mconcat + [ builder (Cabal Flags) ? mconcat + [ arg "-use-ghc-trace-events" + -- Add support for eventlog-socket commands + , arg "+control" + ] + ] + + , package eventlogSocket ? mconcat + [ builder (Cabal Flags) ? mconcat + [ + -- Add support for eventlog-socket commands + arg "+control" + ] + ] + ---------------------------------- ghc --------------------------------- , package ghc ? mconcat [ builder Ghc ? mconcat @@ -114,6 +130,8 @@ packageArgs = do , builder (Cabal Flags) ? mconcat [ andM [expr (ghcWithInterpreter stage), orM [expr (notM cross), stage1]] `cabalFlag` "interpreter" , andM [expr (ghcWithInterpreter stage), notM (expr cross)] `cabalFlag` "internal-interpreter" + , notStage0 `cabalFlag` "eventlog-socket" + , notStage0 `cabalFlag` "sampleTracer" , ifM stage0 -- We build a threaded stage 1 if the bootstrapping compiler -- supports it. ===================================== libraries/async ===================================== @@ -0,0 +1 @@ +Subproject commit 474fc7f612b74e73e24e91474fa75af18eede7b7 ===================================== libraries/hashable ===================================== @@ -0,0 +1 @@ +Subproject commit d56d62eb2a9ff4376e7119d925ececa60959d9ec ===================================== libraries/unordered-containers ===================================== @@ -0,0 +1 @@ +Subproject commit 368ea40488bf3c644e9c36d996302029fb0fc227 View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/57a6a8fab1cb42f9e4c2fd98883ec1… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/57a6a8fab1cb42f9e4c2fd98883ec1… You're receiving this email because of your account on gitlab.haskell.org. 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[Git][ghc/ghc][wip/mangoiv/ci-stages] fixup! ci: build and test stage
by Magnus (＠MangoIV) 10 Sep '26

10 Sep '26

Magnus pushed to branch wip/mangoiv/ci-stages at Glasgow Haskell Compiler / GHC Commits: 84da245c by mangoiv at 2026-09-10T17:01:58+02:00 fixup! ci: build and test stage - - - - - 1 changed file: - .gitlab/generate-ci/gen_ci.hs Changes: ===================================== .gitlab/generate-ci/gen_ci.hs ===================================== @@ -1140,8 +1140,8 @@ instance ToJSON a => ToJSON (JobGroup a) where , "r" .= r ] instance ToJSON a => ToJSON (BuildAndTestJob a) where - toJSON MkBuildAndTestJob {buildJob, testJobs} = - object [ "build" .= buildJob, "test" .= testJobs ] + -- the test job is not relevant for the job metadata output + toJSON MkBuildAndTestJob {buildJob} = toJSON buildJob -- | Construct a 'JobGroup' which consists of a validate, nightly and release build with -- a specific config. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/84da245c9127db368182752b17e6f8a… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/84da245c9127db368182752b17e6f8a… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/fendor/has-field-hie] 44 commits: cmm dumps: Add machop width info with -dppr-debug for infix ops.
by Hannes Siebenhandl (＠fendor) 10 Sep '26

10 Sep '26

Hannes Siebenhandl pushed to branch wip/fendor/has-field-hie at Glasgow Haskell Compiler / GHC Commits: e9bbe8f9 by Andreas Klebinger at 2026-08-26T15:09:23-04:00 cmm dumps: Add machop width info with -dppr-debug for infix ops. - - - - - 86e3a9d8 by Andreas Klebinger at 2026-08-26T15:09:24-04:00 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. - - - - - 13781cca by Andreas Klebinger at 2026-08-26T15:09:24-04:00 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. - - - - - d8fa5d7c by Andreas Klebinger at 2026-08-26T15:09:24-04:00 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. - - - - - 94822c95 by Andreas Klebinger at 2026-08-26T15:09:24-04:00 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 - - - - - dd1ba88a by Andreas Klebinger at 2026-08-26T15:09:24-04:00 cmmLint: Lint against MO_FS_Truncate subword use. - - - - - fd22f71e by Zubin Duggal at 2026-08-26T15:10:20-04:00 ghc-internal: annotateSTM should use catchSTM# rather than catch# A catch# frame inside a transaction breaks retry and async exception delivery. Fixes #27657 - - - - - bb324171 by Rodrigo Mesquita at 2026-08-26T15:10:59-04:00 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 - - - - - ed99b7b7 by Rodrigo Mesquita at 2026-08-26T15:10:59-04:00 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 - - - - - cd653714 by Alan Zimmerman at 2026-08-26T15:11:49-04:00 EPA: Uses Parsers.parseModule for exactprint tests Parsers.parseModule is the advertised way to parse for use for exact printing in the ghc-exactprint library. This commit updates the GHC exact print testing to use it. This requires moving the comment balancing that was occurring only in the test path into the advertising parser path, so it moves from Transforms.hs to Utils.hs. Also update the comment adding to honour trailing annotations - - - - - d1d01fa5 by Wolfgang Jeltsch at 2026-08-27T13:17:59+03:00 Add `rethrowSTM` and improve STM-related documentation Adding `rethrowSTM` resolves #26758. The implementation of `rethrowSTM` is completely analogous to the one of `rethrowIO`. The following is established for the documentation of `throwSTM` and `catchSTM`: * Both operations are directly described as analogs of their `IO` counterparts. * There is no reference to `throw` in the documentation of `throwSTM`, because, although such a reference is great in the documentation of `throwIO`, it is somewhat out of place in the documentation of `throwSTM`. * Instead of repeating part of `throwIO`’s documentation, the documentation of `throwSTM` just recommends using `throwSTM` instead of `throw` and references the corresponding arguments in the documentation of `throwIO`. - - - - - 06fde293 by fendor at 2026-08-28T06:06:44-04:00 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 - - - - - 024c4d04 by fendor at 2026-08-28T06:07:23-04:00 Reuse the UnitIndexCache after initialising multiple home units - - - - - 55326fa0 by Alan Zimmerman at 2026-08-28T06:08:03-04:00 EPA: Some Haddock processing tweaks These changes to the Haddock postprocessing should not change behaviour, but just bring it more closely in line with the original, changed at 44309cd377f And add some haddock exactprint tests to show they work. - - - - - b3ddee95 by Andreas Klebinger at 2026-08-28T13:57:46-04:00 hadrian: Deprecate quickest flavour. It was more of a trap for new users than actually beneficial so we deprecate it and suggest quick+no_dynamic_libs to users instead. - - - - - a1d81390 by Andreas Klebinger at 2026-08-28T13:58:37-04:00 cmm: Always favour entry block during block deduplication. We now always keep the first block in the CmmGraph. This way we avoid the need to update the entry info table. Failing to do so caused #27722. Fixes #27722. - - - - - 5bd65f00 by Andreas Klebinger at 2026-08-28T13:59:16-04:00 test: FamAppCachePerf - Only collect bytes allocated. Fixes 27747 - - - - - ced53ce6 by mangoiv at 2026-08-29T07:15:24-04:00 nightlies: output yaml to file only Previously we would just output the metadata to stdout which risks that it's clobbered by incidental debugt output. We now output to file only. Fixes #27511 - - - - - 578bd185 by Andreas Klebinger at 2026-08-29T07:16:05-04:00 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. - - - - - 7bf546fc by Simon Peyton Jones at 2026-08-31T23:48:53-04:00 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 - - - - - 5f474953 by Zubin Duggal at 2026-08-31T23:48:53-04:00 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 - - - - - cd5c6bcc by Zubin Duggal at 2026-08-31T23:48:53-04:00 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 - - - - - abfc224a by Zubin Duggal at 2026-08-31T23:48:53-04:00 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 - - - - - 1557fd1c by Zubin Duggal at 2026-08-31T23:48:53-04:00 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 - - - - - 4117e5ae by Wolfgang Jeltsch at 2026-08-31T23:49:35-04:00 Incorporate the `rethrowSTM` reexport into the `stm` submodule - - - - - 4bfbf5c8 by ARATA Mizuki at 2026-09-01T18:55:08-04:00 testsuite: Fix out-of-bounds access in T3586 unsafeRead and unsafeWrite use 0-based index. Looking at #3586, the expected output seems to be 2.8e8. Addresses #27596 - - - - - 3f9db6d4 by ARATA Mizuki at 2026-09-01T18:55:08-04:00 testsuite: Fix out-of-bounds access in T21305 writeInt64Array# takes an index measured in units of Int64 elements. Fixes #27596 - - - - - 44d7788f by Simon Peyton Jones at 2026-09-01T18:55:53-04:00 Fix buglet in INLINE-arity calculation for pattern synonyms This fixes #27744. The buglet was accidentally introduced by commit 3a0f9a51c1dacc474c7fd128082edd8bf4081256 Author: Simon Peyton Jones <simon.peytonjones(a)gmail.com> Date: Sat Aug 1 00:13:02 2026 +0100 Fix three bugs related to required type args and INLINE pragmas I failed to find all the calls to `addInlinePragArity`! - - - - - df058f1d by Simon Jakobi at 2026-09-02T07:18:06-04:00 testsuite: Migrate perf tests off collect_compiler_stats('all') The 'all' metric argument applies a single tolerance to bytes allocated, max_bytes_used and peak_megabytes_allocated, although their noise profiles are incompatible (#27653): allocations are nearly deterministic, residency needs 10-20%, and peak is quantized to 1 MB. Any single tolerance is too tight for one metric or too slack for another. This migrates the remaining users of 'all' (and of the 'all' default) to explicit per-metric collection, ahead of removing 'all' from the driver. peak_megabytes_allocated is dropped everywhere: its 1 MB granularity makes tight relative windows meaningless (#27613), and it is sensitive to GC timing. In #27489 it drifted by -5.3% while max_bytes_used moved by less than 0.1%. Where a test guards a memory property, max_bytes_used covers it at byte granularity. Where the motivating ticket was about compile-time memory (T11545, T15304, T26425), residency remains gated via max_bytes_used, now with a residency-appropriate tolerance. max_bytes_used is dropped where residency was only ever an accident of 'all': * T15630, T15630a, T20261: the underlying tickets (#15630, #20261) contain no memory data at all. One is a simplifier-ticks blowup and the other is stated entirely in allocation numbers, so the 20% window never had teeth. * T21839c: #21839's measurements show residency essentially flat (+0.16%) while allocations moved +7%, so allocations are the discriminating metric. They are already gated at 1% via collect_compiler_runtime. The ghc/max gate had previously broken CI spuriously (9fd11585eb widened it from 1% to 10% for that reason). Allocation tolerances are tightened to the testsuite's conventional 2% where 'all' previously left them at 10-20%. Assisted-by: Claude Fable 5 - - - - - 72dd2432 by Simon Jakobi at 2026-09-02T07:18:06-04:00 testsuite: Remove the 'all' metric argument of collect_stats 'all' gated bytes allocated, max_bytes_used and peak_megabytes_allocated at a single tolerance, although their noise profiles are incompatible, making such tests either flaky or toothless (#27653). Closes #27653. Assisted-by: Claude Fable 5 - - - - - 2228cb30 by Simon Jakobi at 2026-09-02T07:18:06-04:00 testsuite: Make the deviation argument of collect_stats mandatory Almost every caller passes an explicit tolerance matched to the metric's noise profile, and the silent 20% default is far slacker than 'bytes allocated' merits. Only two tests relied on it. They now state their tolerance explicitly: large-project gets 10%, in line with other large compile-time tests. T9848 gets 2%: its metric is byte-for-byte deterministic across CI jobs and platforms of a given test_env, has drifted only about 2.5% since 2015, and the fusion failure it guards against would show up as a roughly +30000% jump. Assisted-by: Claude Fable 5 - - - - - 56291fc5 by Cheng Shao at 2026-09-02T07:18:45-04:00 autoconf/ghc-toolchain: bump llvm upper bound to support llvm 23 This commit bumps llvm upper bound to support llvm 23. - - - - - 20eb3f41 by Cheng Shao at 2026-09-02T07:18:45-04:00 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. - - - - - 9e7739ab by Simon Jakobi at 2026-09-03T13:45:43-04:00 Add -Wimplicit-field-strictness (#16836) This opt-in warning fires when a data constructor field lacks an explicit strictness annotation (`!` or `~`). It complements the LazyFieldAnnotations extension (4762a8bf30f) from GHC proposal 752, which makes `~` annotations available for this purpose. Deciding which fields to report requires their levity, so the check runs after typechecking. To keep the noise down, the diagnostic is emitted once per data declaration, grouped by constructor. Closes #16836. Assisted-by: Claude Fable 5 - - - - - 6a44d591 by mangoiv at 2026-09-03T13:46:22-04:00 simplifier: remove a bogus `assert` in `rebuild_app'` in `GHC.CoreToStg.Prep.cpeApp`. Prior to this commit commit 08bc245be70d95801bc1138804ed1de9474fbdc0 Author: sheaf <sam.derbyshire(a)gmail.com> Date: Sat Feb 28 16:30:43 2026 +0100 Clean up join points, casts & ticks This commit shores up the logic dealing with casts and ticks occurring in between a join point binding and a jump any `PlaceRuntime` ticks we observed were profiling ticks, even though that isn't necessary. The more liberal rules in the above commit allow e.g. breakpoint ticks (which are valid PlaceRuntime ticks) to legitimately appear in an argument position. Fixes #27556 - - - - - eaa95a6f by Andrei Borzenkov at 2026-09-04T08:08:40-04:00 Parentheses in prefix GADT constructors (#27423) Updated `splitLHsGadtTy` to allow looking through the parentheses for inner binders. General example of a code pattern that's allowed now: data S a where MkS :: (forall a. S a) That should work now with any combination of nested foralls and parentheses. We don't perform parenthesis unwrapping for record GADT constructors in accordance with GHC Proposal #402. To this end `con_inner_bndrs` no longer stores plain forall telescopes: `[HsForAllTelescope pass]` is replaced with `[LHsGadtTelescope pass]`, a new `HsArg`-style type whose `HsGadtForAll` holds an inner telescope and whose `HsGadtPar` holds a pair of parentheses. The parentheses carry no meaning for renaming or type checking; the only reason to record them is exact-printing. Updated `pprConDecl` to improve the `parse == parse . ppr . parse` property of GADT pretty-printing. The pretty printer can now output code that's similar to this: data T a where MkT1 :: (forall a. T a) MkT2 :: forall . forall a. T a These are special cases of inner forall binders for prefix GADT constructors, when we have either implicit or zero explicit outer binders. - - - - - 639456a8 by Evgeny Malyshev at 2026-09-04T08:09:25-04:00 HsPat: Add spacing to unary tuple patterns Use hsep when printing unary boxed TuplePat applications so that the MkSolo constructor is separated from its argument. The old hcat rendered wildcard and parenthesized arguments as MkSolo_ and MkSolo(). Add T27034 to exercise the HsPat splice-dump path with wildcard and variable arguments, and update existing affected golden output. Fixes #27034 Assisted-By: OpenAI Codex - - - - - 2908ab36 by Simon Jakobi at 2026-09-05T07:22:17-04:00 X86 NCG: use btr/bts/btc for single-bit operations Previously the Cmm patterns x & ~(1 << i) x | (1 << i) x ^ (1 << i) compiled to mov/shl/not/and-style sequences of 3-4 instructions. Now they compile to a single btr, bts or btc, matching what C compilers produce. When the bit index is a literal, constant folding has already collapsed these patterns into ones with a literal mask, such as x & 0xfffffeffffffffff for x & ~(1 << 40). Such masks are now also compiled to a bit-test instruction when they don't fit in an imm32 and would otherwise have to be loaded into a register first. For a variable bit index, this applies only when the shift is unchecked (uncheckedShiftL#, Data.Bits.unsafeShiftL): the bounds-checked shiftL used by e.g. the default clearBit/setBit/complementBit implementations wraps the shift in a bounds mask that this optimisation does not see through. With a literal index, the bounds mask is constant-folded away, so the checked operations benefit too. See Note [Bit-test instructions] in GHC.CmmToAsm.X86.CodeGen. Fixes #25233. Assisted-by: Claude Fable 5 - - - - - c673ecf0 by Simon Peyton Jones at 2026-09-05T07:22:59-04:00 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 - - - - - 5939ceaf by sheaf at 2026-09-05T22:06:18-04:00 Windows: enforce path convention in ./configure As detailed in Note [MSYS paths] in Hadrian.Utilities, the standing convention (using Windows-style paths with forward slashes) is now enforced in ./configure instead of within Hadrian, removing the need for 'cygpath' calls within Hadrian. Fixes #26683 - - - - - a6061455 by sheaf at 2026-09-05T22:06:18-04:00 Hadrian: introduce ExeSpawnPath Specific details about the filepath used to specify the executable to spawn with CreateProcess matters on Windows: whether we use forward or backward slashes, a leading ./, or an absolute path changes how the executable is found. This commit introduces 'ExeSpawnPath' which is a path that is guaranteed to be found when spawning a process. All command invocations now go through this type to ensure the path has been properly sanitised. See Note [NeedCurrentDirectoryForExePath] in Hadrian.Utilities. The same treatment is applied to hsc2hs. Updates hsc2hs submodule. - - - - - e28313e3 by sheaf at 2026-09-05T22:07:06-04:00 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 - - - - - 3172f557 by sheaf at 2026-09-05T22:07:06-04:00 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. - - - - - bd7eb44b by fendor at 2026-09-10T16:20:17+02:00 WIP: .hie spans for Record Dot Syntax - - - - - 286 changed files: - .gitlab-ci.yml - .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py - + changelog.d/27556 - + changelog.d/27627 - + changelog.d/27703 - + changelog.d/27704 - + changelog.d/27717 - changelog.d/T27202 - + changelog.d/T27657 - + changelog.d/T27705 - + changelog.d/T27722-cbe-entry-block.md - + changelog.d/T27744 - + changelog.d/T27749 - + changelog.d/T27764 - + changelog.d/allow-gadt-prefix-con-parens - + changelog.d/arm_ncg_fixes_T27430 - + changelog.d/implicit-field-strictness-warning - changelog.d/lazy-field-annotations - + changelog.d/llvm-23 - + changelog.d/ncg-x86-bit-test-instructions - + changelog.d/rethrow-stm - changelog.d/unit-index - compiler/GHC/Cmm/CommonBlockElim.hs - compiler/GHC/Cmm/DebugBlock.hs - compiler/GHC/Cmm/Expr.hs - compiler/GHC/Cmm/Lint.hs - compiler/GHC/Cmm/MachOp.hs - compiler/GHC/Cmm/Parser.y - 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hadrian/src/Hadrian/Oracles/Path.hs - hadrian/src/Hadrian/Utilities.hs - hadrian/src/Oracles/Setting.hs - hadrian/src/Oracles/TestSettings.hs - hadrian/src/Rules/BinaryDist.hs - hadrian/src/Rules/Changelog.hs - hadrian/src/Rules/Codes.hs - hadrian/src/Rules/Lint.hs - hadrian/src/Rules/Nofib.hs - hadrian/src/Rules/Test.hs - hadrian/src/Settings.hs - − hadrian/src/Settings/Flavours/Quickest.hs - libraries/base/src/GHC/Conc.hs - libraries/base/tests/all.T - libraries/ghc-internal/src/GHC/Internal/STM.hs - libraries/stm - m4/find_python.m4 - + m4/fp_canonicalise_win_path.m4 - m4/fp_find_nm.m4 - m4/fp_find_root.m4 - m4/fp_prog_ar.m4 - m4/fp_prog_ar_args.m4 - m4/fp_prog_sh.m4 - m4/fptools_alex.m4 - m4/fptools_happy.m4 - rts/CloneStack.c - rts/Interpreter.c - rts/Messages.c - rts/ProfHeap.c - rts/StgMiscClosures.cmm - rts/Threads.c - rts/Threads.h - rts/eventlog/EventLog.c - rts/include/rts/storage/Closures.h - rts/include/stg/MiscClosures.h - rts/prim/atomic.c - testsuite/driver/README.md - 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testsuite/tests/rename/should_fail/RnStaticPointersFail03.stderr - testsuite/tests/rename/should_fail/T26545.stderr - + testsuite/tests/simd/should_run/T27565.hs - + testsuite/tests/simd/should_run/T27565.stdout - testsuite/tests/simd/should_run/all.T - testsuite/tests/simplCore/should_compile/T17966.stderr - + testsuite/tests/simplCore/should_compile/T27556.hs - + testsuite/tests/simplCore/should_compile/T27556.script - + testsuite/tests/simplCore/should_compile/T27749.hs - + testsuite/tests/simplCore/should_compile/T27749.stderr - testsuite/tests/simplCore/should_compile/T7785.stderr - testsuite/tests/simplCore/should_compile/all.T - testsuite/tests/simplCore/should_compile/spec004.hs - testsuite/tests/simplCore/should_compile/spec004.stderr - + testsuite/tests/simplCore/should_run/T27703/Lib.hs - + testsuite/tests/simplCore/should_run/T27703/Main.hs - + testsuite/tests/simplCore/should_run/T27703/T27703.stdout - + testsuite/tests/simplCore/should_run/T27703/all.T - + testsuite/tests/simplCore/should_run/T27705.hs - + testsuite/tests/simplCore/should_run/T27705.stdout - + testsuite/tests/simplCore/should_run/T27705_Inst.hs - testsuite/tests/simplCore/should_run/all.T - testsuite/tests/th/T17380.stderr - testsuite/tests/th/T18612.stderr - + testsuite/tests/th/T27034.hs - + testsuite/tests/th/T27034.stderr - testsuite/tests/th/T8761.stderr - testsuite/tests/th/all.T - + testsuite/tests/typecheck/should_compile/T27664.hs - testsuite/tests/typecheck/should_compile/all.T - + testsuite/tests/warnings/should_compile/T16836a.hs - + testsuite/tests/warnings/should_compile/T16836a.stderr - + testsuite/tests/warnings/should_compile/T16836b.hs - + testsuite/tests/warnings/should_compile/T16836c.hs - + testsuite/tests/warnings/should_compile/T16836c.stderr - + testsuite/tests/warnings/should_compile/T16836d.hs - + testsuite/tests/warnings/should_compile/T16836d.stderr - testsuite/tests/warnings/should_compile/all.T - utils/check-exact/ExactPrint.hs - utils/check-exact/Main.hs - utils/check-exact/Parsers.hs - utils/check-exact/Transform.hs - utils/check-exact/Utils.hs - utils/ghc-toolchain/src/GHC/Toolchain/Program.hs - utils/ghc-toolchain/src/GHC/Toolchain/Target.hs - utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/GhcUtils.hs - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs - utils/haddock/haddock-api/src/Haddock/Types.hs - utils/hsc2hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/aec841af8d69161d39ef8478d3e355… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/aec841af8d69161d39ef8478d3e355… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/fendor/ghc-debug-baseline] 385 commits: Hadrian: create a ghc-internal .def file per ghc-internal dll
by Hannes Siebenhandl (＠fendor) 10 Sep '26

10 Sep '26

Hannes Siebenhandl pushed to branch wip/fendor/ghc-debug-baseline at Glasgow Haskell Compiler / GHC Commits: d603477f by David Eichmann at 2026-05-29T13:17:12-04:00 Hadrian: create a ghc-internal .def file per ghc-internal dll The .def file generated from rts/win32/libHSghc-internal.def.in contains the name of the ghc-internal dll. The correct dll name differs based on if the dll is inplace/final and if using the Dynamic way. Previously, this was not accounted for and inconsistent dlls names where used. That led to failure when loading dlls at runtime in experiments with windows dynamic linking. - - - - - 1fc21753 by Sylvain Henry at 2026-05-29T13:18:14-04:00 ghc-bignum: copy backend interface haddocks to Native backend (#27305) The haddock comments documenting the BigNat backend interface (function contracts, expected MutableWordArray# sizes, return-value semantics, etc.) were attached to the FFI backend module. Copy them to the Native backend so they remain in tree once the FFI backend is removed. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com> - - - - - 717059df by Sylvain Henry at 2026-05-29T13:18:14-04:00 ghc-bignum: remove FFI backend (#27305) The FFI backend of ghc-bignum (now part of ghc-internal) had no known users and is easy to recreate by relinking ghc-internal with a custom backend. Remove the backend module, the bignum-ffi cabal flag, and the ffi option from Hadrian's --bignum selector. The backend interface documentation now lives in the Native backend module. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com> - - - - - 4bb3b1d8 by Sylvain Henry at 2026-05-29T13:18:14-04:00 ghc-bignum: remove Check backend (#27305) The Check backend of ghc-bignum (now part of ghc-internal) compared the selected backend's output against the Native backend for validation. It had no known users. Remove the backend module, the bignum-check cabal flag, the bignumCheck Hadrian flavour field, and the check- prefix in Hadrian's --bignum selector. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com> - - - - - 6b3044a0 by David Eichmann at 2026-05-30T11:58:48-04:00 Add code comments to allocator code - - - - - f4e04210 by Matthew Pickering at 2026-05-30T11:59:34-04:00 hadrian: Refactor system-cxx-std-lib rules I noticed a few things wrong with the hadrian rules for `system-cxx-std-lib` rules. * For `text` there is an ad-hoc check to depend on `system-cxx-std-lib` outside of `configurePackage`. * The `system-cxx-std-lib` dependency is not read from cabal files. * Recache is not called on the packge database after the `.conf` file is generated, a more natural place for this rule is `registerRules`. Treating this uniformly like other packages is complicated by it not having any source code or a cabal file. However we can do a bit better by reporting the dependency firstly in `PackageData` and then needing the `.conf` file in the same place as every other package in `configurePackage`. This commit increases the `shakeVersion`, to provide backwards compatibility to previous builds with different PackageData. Fixes #25303 Co-authored-by: Sven Tennie <sven.tennie(a)gmail.com> - - - - - 576987d0 by Simon Jakobi at 2026-06-02T04:53:36-04:00 compiler: use nubOrd from containers Address #27103 by replacing GHC.Utils.Misc.ordNub[On] with Data.Containers.ListUtils.nubOrd[On]. Note that nubOrd suffers from a small inefficiency, a fix for which will be included in the next containers release: https://github.com/haskell/containers/issues/1202 - - - - - deea53c3 by David Eichmann at 2026-06-02T04:54:22-04:00 Hadrian: disable response files for GHC/Haddock builders on non-Windows This makes debugging build errors easier on non-windows hosts. See issue #27230 - - - - - f2f5c6ba by Nikita Efremov at 2026-06-02T16:04:54+00:00 fix typo : compete with performance, not complete - - - - - 5524ea0e by Wolfgang Jeltsch at 2026-06-03T08:01:26-04:00 Make the current `base` buildable with GHC 9.14 This comprises the following changes: * Disable some imports into `GHC.Base` for GHC 9.14 * Disable some imports into `Prelude` for GHC 9.14 * Disable separate `ArrowLoop` import for GHC 9.14 * Disable `GHC.Internal.STM` import for GHC 9.14 * Disable `GHC.Internal.Unicode.Version` import for GHC 9.14 * Disable `GHC.Internal.TH.Monad` import for GHC 9.14 * Add alternative `fixIO` import for GHC 9.14 * Add alternative `unsafeCodeCoerce` import for GHC 9.14 * Disable hiding of imported SIMD operations for GHC 9.14 * Disable use of GHC 9.14’s `printToHandleFinalizerExceptionHandler` * Enable use of `getFileHash` from `ghc-internal` for GHC 9.14 * Make `thenA` available for GHC 9.14 * Make `thenM` available for GHC 9.14 * Disable translation of `IoManagerFlagPoll` for GHC 9.14 * Add `hGetNewlineMode` for GHC 9.14 - - - - - d3438055 by Enrico Maria De Angelis at 2026-06-03T08:02:17-04:00 Fix #27067 - Clarify haddocks on `minusNaturalMaybe` - - - - - f9bcfac2 by sheaf at 2026-06-03T14:47:19-04:00 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 - - - - - cf1fd661 by Artem Pelenitsyn at 2026-06-03T14:48:09-04:00 clarify comment for getSizeofMutableByteArray#: we get the size in bytes, not "elements" - - - - - a3b431f3 by David Eichmann at 2026-06-04T10:10:19+00:00 Hadrian: convert env variable ACLOCAL_PATH to unix paths. Convert ACLOCAL_PATH to a unix style path when invoking autoreconf. Autoreconf doesn't handle windows paths. See Note [Autoreconf unix paths from ACLOCAL_PATH]. Fixes #27311 - - - - - 18f6138a by Simon Jakobi at 2026-06-04T20:20:31-04:00 testsuite: Deduplicate --only test names config.only is assumed to be a set, but supplying --only overwrote it with the (list) argparse result, which can contain duplicates. When a test ran, config.only.remove(name) dropped only the first occurrence, so a duplicated name lingered and was later misreported as a "test not found" framework failure. Store it as a set instead. Fixes #27322 Co-Authored-By: Claude Opus 4.7 <noreply(a)anthropic.com> - - - - - 2f3cc9ff by Simon Jakobi at 2026-06-08T07:55:49-04:00 testsuite: detect fast bignum via ghc-internal, not removed ghc-bignum The ghc-bignum package was merged into ghc-internal, so the BIGNUM_GMP probe in test.mk ran `ghc-pkg field ghc-bignum exposed-modules`, which fails with "cannot find package ghc-bignum". That error went to stderr and leaked into the captured stderr of every makefile_test, causing spurious [bad stderr] failures across the suite. The probe also silently returned empty, so config.have_fast_bignum was wrongly False even on GMP builds. Probe ghc-internal's extra-libraries for the gmp library instead: the GMP backend module is an other-module (not exposed), but GMP_LIBS adds gmp to extra-libraries only on a GMP build, so this distinguishes the backends. Redirect stderr to keep any future missing-package error off the harness's stderr. This also removes a stale comment as per suggestion from hsyl20. Co-Authored-By: Claude Opus 4.7 <noreply(a)anthropic.com> - - - - - eb3bf6e7 by Alan Zimmerman at 2026-06-08T07:56:32-04:00 EPA: Rename Transform.anchorEof to addModuleCommentOrigDeltas This now matches what it actually does. - - - - - 498bb21a by David Eichmann at 2026-06-09T18:02:39-04:00 Hadrian: avoid response files when command line is short enough This replaces the logic of always using response files on Windows. With the new condition based on command line lenght, reponse files can be avoided in many more cases (on windows). Now that response files are only used in a small number of cases, response files are always kept and the -r / --keep-response-files command line options have been removed The response file paths are nolonger randomized. They are placed in the `_build/rsp` directory. This ensures they are ignored by git and we that Hadrian reuses response file paths when rebuilding rather than leaving stale response files around. Update user guide putting response files in its own section - - - - - 87f510a5 by Simon Hengel at 2026-06-09T18:03:25-04:00 Don't use non-breaking spaces - - - - - 41a19379 by David Eichmann at 2026-06-09T18:04:11-04:00 Hadrian: remove unused wrapper scripts from windows bindist These wrapper scripts are only installed on non-relocatable builds which are not generally supported on windows. - - - - - ce01ccb6 by sheaf at 2026-06-10T05:08:48-04:00 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 ------------------------- - - - - - d311c4f1 by Simon Jakobi at 2026-06-10T05:09:32-04:00 testsuite: Add regression test for #4081 Check that a strict constructor field is unboxed once outside an enclosing loop, not re-inspected each iteration (the float-out case-floating from 9cb20b488). Uses simonpj's `data T a = T !a` example from the ticket; T4081.stderr captures the expected Core. Co-Authored-By: Claude Opus 4.7 <noreply(a)anthropic.com> - - - - - 333df444 by sheaf at 2026-06-10T05:10:25-04:00 Check for cabal-install >= 3.12 upfront Starting with commit 8cb99552f607f6bc4000e45ab32532d50c8bb996, Hadrian requires cabal-install >= 3.12 in order to use the 'cabal path' command that was introduced in version 3.12, as per https://github.com/haskell/cabal/blob/a51c4ee1556d816ad86e90db7e6330dd51b0b… This was not reflected in the Hadrian build script, causing a delayed build failure instead of enforcing the version requirement upfront, which this patch does. Fixes #27317 - - - - - 98c20394 by sheaf at 2026-06-10T05:11:09-04:00 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. - - - - - 5ac9ce7d by Zubin Duggal at 2026-06-10T21:26:32+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 - - - - - c9015f09 by sheaf at 2026-06-11T12:40:28-04:00 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 - - - - - 7ab90288 by Rodrigo Mesquita at 2026-06-11T12:41:11-04:00 fix: make T27131 less flaky It seems that T27131 fails flakily in a race where we check the flag before the capability had the chance to process the mailbox which sets the flag. This seemingly should only happen if the capability ends up being the same for setting and checking the flag. - - - - - 8965cb76 by Marc Scholten at 2026-06-12T04:53:22-04:00 haddock: render modules concurrently - - - - - 8cc0b64a by Duncan Coutts at 2026-06-12T04:54:06-04:00 Promote HAVE_PREEMPTION from Timer.c to OSThreads.h We will want to know about HAVE_PREEMPTION in more places. HAVE_PREEMPTION tells us that we do have OS threads available, irrespective of whether THREADED is defined. In particular, HAVE_PREEMPTION is defined on all proper OSs, but not on WASM (and hyopthetically may not be true on some other platforms like micro-controllers, RTOSs, VM hypervisors etc). - - - - - cce574ed by Duncan Coutts at 2026-06-12T04:54:06-04:00 Define ACQUIRE_LOCK_ALWAYS and friends Fix issue #27335 Like the atomic _ALWAYS variants, these lock actions are always defined, rather than being dependent on whether we are in the THREADED case. All the "normal" LOCK macros are defined to be no-ops when !THREADED. The use case for the _ALWAYS variants is where we are using OS threads even in the non-threaded RTS. This includes everything to do with the timer/ticker thread, which is used in the non-threaded RTS too. In particular, we will want to use this for eventlog things, because the timer thread performs eventlogging concurrently with the main capability, even in the non-threaded RTS. - - - - - 1f28d1f6 by Duncan Coutts at 2026-06-12T04:54:06-04:00 Use ACQUIRE/RELEASE_LOCK_ALWAYS with eventBufMutex Even in the non-threaded RTS the eventBufMutex is needed by both the main capability and the timer/ticker thread, so always use the mutex. This should fix #25165 which is about the main capability and the timer thread posting events to the eventlog buffer concurrently and thereby corrupting the buffer data. - - - - - 0ff29782 by Duncan Coutts at 2026-06-12T04:54:06-04:00 Expose eventBufMutex in the EventLog interface/header We will need it in forkProcess to ensure we don't write to the global eventlog buffer concurrently with trying to flush eventlog buffers and do the fork(). - - - - - 7a688395 by Duncan Coutts at 2026-06-12T04:54:07-04:00 Split flushAllCapsEventsBufs into safe and unlocked version Following the convention that unlocked versions have a trailing _ underscore in their name. This one requires the caller to hold the eventlog global buffer mutex. We will need this in forkProcess. - - - - - 341ed474 by Duncan Coutts at 2026-06-12T04:54:07-04:00 Remove redundant use of stopTimer in setNumCapabilities Historically, the comment here was: We must stop the interval timer while we are changing the capabilities array lest handle_tick may try to context switch an old capability. See #17289. and We must disable the timer while we do this since the tick handler may call contextSwitchAllCapabilities, which may see the capabilities array as we free it. What this refers to is that historically, when changing the number of capabilities, the array of capabilities was reallocated to a new size, allocating new ones and freeing the old ones, thus invalidating all existing capbility pointers. Strangely, for good measure the code used to call stopTimer twice (hence the two similar comments above). However, since commit a3eccf06292dd666b24606251a52da2b466a9612, the capabilities array is no longer reallocated. Instead the array is allcoated once on RTS startup to the maximum size it could ever be allowed to be, and then capabilities get enabled/disabled at runtime. So the capability pointers never become invalid anymore. At worst, they may point to capabilities that are disabled. Thus we no longer need to stop the timer (twice) while we change the number of enabled capabilities. This also partially solves issue #27105, which notes that stopTimer is being used as if it were synchronous, when it is not. At least for this case, the solution is that stopTimer is not needed at all! - - - - - 674858e3 by Duncan Coutts at 2026-06-12T04:54:07-04:00 Remove redundant use of stopTimer in forkProcess but replace it with taking the eventlog buffer lock during the fork. Fixes issue #27105 The original reason to block the timer during a fork was that historically the timer was implemented using a periodic timer signal, and the signal itself would interrupt the fork system call (returning EINTR). For large processes (where fork() takes a while) this could permanently livelock: the timer always would go off before the fork could complete, which got retried in a loop forever. The timer is no longer implemented as a unix signal, but uses threads. Thus the original problem no longer exists. The only remaining reason to block the timer tick is to prevent actions taken by the tick from interfering with the delicate process involved in fork (taking a load of locks and pausing everything). The only thing we need to do is to prevent the eventlog from being written to or flushed while the fork is taking place. To achieve this all we need to do is hold the mutex for the global eventlog buffer. This removes the last use of stopTimer that expects stopTimer to work synchronously (which it was not) and thus solves issue #27105. To be clear, we solve issue #27105 not by making stopTimer synchronous, but by eliminating the use sites that expected it to be synchronous. - - - - - 40764930 by sheaf at 2026-06-12T14:54:43-04:00 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). - - - - - 0f3d0a71 by Zubin Duggal at 2026-06-12T14:55:30-04:00 compiler: mark tool messages as errors/warnings depending on the exit code Fixes #27370 - - - - - d9ea2d76 by mangoiv at 2026-06-13T04:41:51-04:00 libraries/process: bump submodule to v1.6.30.0 - bump the submodule to the appropriate tag - suppress benign warning resulting from the change - - - - - 6ebaaba3 by David Eichmann at 2026-06-13T04:42:37-04:00 ghc-toolchain: don't throw when candidate executables are not found Fixes #27369 - - - - - 6c65e1e1 by David Eichmann at 2026-06-13T04:43:23-04:00 CI: lint-changelog checks for no-changelog label in script instead of rules - - - - - bab37cc6 by konsumlamm at 2026-06-13T19:10:21+02:00 Implement CLC proposal #378 Add `Data.Double` and `Data.Float` modules Document that GHC uses IEEE 754 - - - - - fb5246ad by fendor at 2026-06-15T18:07:23-04:00 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`. - - - - - 291ce3aa by ARATA Mizuki at 2026-06-15T18:08:26-04:00 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 - - - - - 011be91f by ARATA Mizuki at 2026-06-15T18:08:26-04:00 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 - - - - - e8a54713 by ARATA Mizuki at 2026-06-15T18:08:26-04:00 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 - - - - - 9438bec7 by Zubin Duggal at 2026-06-15T18:09:11-04:00 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=ccead81bbc39668376eb5cf47066a… Fixes #27366 - - - - - 893e6133 by Andrew Lelechenko at 2026-06-15T23:55:36+01:00 base: more NonEmpty zips CLC proposal: https://github.com/haskell/core-libraries-committee/issues/409 - - - - - 1314f2fd by David Eichmann at 2026-06-16T05:46:52-04:00 Hadrian: fix ghc-internal .def file name - - - - - 7f72bcb3 by mangoiv at 2026-06-16T05:47:39-04:00 compiler: ignore camelCase and Eta reduce hlint hints These do not cohere with the style used in GHC. After disabling them, hlint lints are much less noisy again. - - - - - 842bef9f by Alan Zimmerman at 2026-06-16T05:48:25-04:00 EPA: Use standard type family declaration for Anno - - - - - f6d30767 by Wolfgang Jeltsch at 2026-06-16T15:32:34-04:00 Fix two issues in the documentation of pipeline interruption One issue is a typo (“interreuptible”), the other one the lack of an end of a sentence, which has been reconstructed from the message of 633bbc1fd4762a2bb73ba1c5b9e0c279f1dd3c40, the commit that introduced said documentation. - - - - - a3fa10e0 by Christian Georgii at 2026-06-16T15:33:26-04:00 Find plugins in sibling home units in multiple-home-unit sessions In a multiple-home-unit session (e.g. `cabal repl --enable-multi-repl` or HLS), enabling a plugin with -fplugin that is defined in (or reexported by) another home unit failed with a "hidden package" error. The plugin module finder only searched the current home unit and the registered external packages, never the sibling home units. findPluginModuleNoHsc now searches the home units that the current home unit depends on, following module reexports and respecting hidden modules, exactly as ordinary import resolution does in findImportedModuleNoHsc. To avoid two divergent copies of this logic, the shared home-unit search (the current home unit first, then its dependencies in priority order, with the accompanying ordering invariant) is extracted into findHomeModuleAmongDeps, which both findImportedModuleNoHsc and findPluginModuleNoHsc now call. Add testsuite/tests/driver/multipleHomeUnits/plugin01, which loads a plugin as byte-code from a sibling home unit, and plugin02, in which the consumer enables a plugin reexported by a sibling home unit without depending on the plugin's own home unit directly. Fixes #27349 - - - - - d216412b by Ian-Woo Kim at 2026-06-16T20:25:57-04:00 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(a)well-typed.com> - - - - - 8e1cc105 by Wolfgang Jeltsch at 2026-06-16T20:25:57-04:00 Change the descriptions of two existing changelog entries The descriptions now describe the changes in a user-friendly manner, as opposed to describing the contributions that led to these changes in a developer-friendly manner. - - - - - 636c1c7a by Ian Duncan at 2026-06-16T20:26:50-04:00 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 - - - - - b734c75d by Igor Ranieri at 2026-06-16T20:27:32-04:00 haddock: Update CONTRIBUTING with missing step, add missing test dependency - - - - - 7fe4f2ec by Luite Stegeman at 2026-06-17T05:35:09-04:00 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 - - - - - 4671c126 by Sebastian Graf at 2026-06-17T05:35:55-04:00 Seed the simplifier's in-scope set for open expressions simplifyExpr simplifies expressions typed at the GHCi prompt and the results of Template Haskell splices. Such an expression may be open: at a GHCi debugger breakpoint its free variables include RuntimeUnk skolems standing for as-yet-unknown types. The simplifier began with an in-scope set holding only the wildcard binder, so when it instantiated the unsafeCoerce# wrapper that GHCi builds around a result, it formed a substitution whose range mentioned a free skolem that was not in scope. That breaks the substitution invariant and, in a compiler built with assertions, trips substTy's sanity check. Seed the initial in-scope set with the free variables of the expression. For a closed expression this adds nothing. See Note [Seed the in-scope set for open expressions]. Fixes #17833 and its duplicate #21118. - - - - - 67d41299 by Sebastian Graf at 2026-06-18T05:18:24-04:00 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 - - - - - fa5defde by Rodrigo Mesquita at 2026-06-18T05:19:11-04:00 fix: Save FastStrings in the PMC There is no point in adding the unique to the occurrence FastString we create, since it is part of the Id anyway. Adding it to the FastString, meant each FastString was unique unnecessarily! In a separate branch, running the compiler on test `InstanceMatching` observed 30000 `FastString`s created by this code path. Plus, `fsLit "pm"` follows the existing pattern in `mkPmId`. - - - - - 4efb4a66 by Alan Zimmerman at 2026-06-18T14:41:14-04:00 TTG: Add extension points to HsConDetails Extend HsConDetails as data HsConDetails p arg rec = PrefixCon !(XPrefixCon p) [arg] -- C @t1 @t2 p1 p2 p3 | RecCon !(XRecCon p) rec -- C { x = p1, y = p2 } | InfixCon !(XInfixCon p) arg arg -- p1 `C` p2 | XHsConDetails !(XXHsConDetails p) type family XPrefixCon p type family XRecCon p type family XInfixCon p type family XXHsConDetails p - - - - - c8d27dd4 by Simon Jakobi at 2026-06-18T14:41:59-04:00 CI: quiet submodule clean output in after_script and setup The clean and cleanup_submodules functions ran 'git submodule foreach git clean -xdf', flooding the job log with 'Entering ...' and 'Removing ...' lines. Pass --quiet to 'git submodule' and -q to 'git clean' to drop the success output; errors are still reported. Co-Authored-By: Claude Opus 4.8 <noreply(a)anthropic.com> - - - - - 09326ca6 by Matthew Pickering at 2026-06-20T23:41:12+02:00 Add missing req_interp modifier to T18441fail3 and T18441fail19 These tests require the interpreter but they were failing in a different way with the javascript backend because the interpreter was disabled and stderr is ignored by the test. - - - - - 521e55bf by Matthew Pickering at 2026-06-20T23:41:13+02:00 hadrian: Fill in more of the default.host toolchain file When you are building a cross compiler this file will be used to build stage1 and it's libraries, so we need enough information here to work accurately. There is still more work to be done (see for example, word size is still fixed). - - - - - 23c9b6c3 by Matthew Pickering at 2026-06-20T23:42:52+02:00 hadrian: Build stage 2 cross compilers * Most of hadrian is abstracted over the stage in order to remove the assumption that the target of all stages is the same platform. This allows the RTS to be built for two different targets for example. * Abstracts the bindist creation logic to allow building either normal or cross bindists. Normal bindists use stage 1 libraries and a stage 2 compiler. Cross bindists use stage 2 libararies and a stage 2 compiler. * hadrian: Make binary-dist-dir the default build target. This allows us to have the logic in one place about which libraries/stages to build with cross compilers. Fixes #24192 New hadrian target: * `binary-dist-dir-cross`: Build a cross compiler bindist (compiler = stage 1, libraries = stage 2) This commit also contains various changes to make stage2 compilers feasible. ------------------------- Metric Decrease: LinkableUsage02 ManyAlternatives ManyConstructors MultiComponentModulesRecomp MultiLayerModulesRecomp RecordUpdPerf T10421 T12150 T12227 T12425 T12707 T13035 T13379 T13820 T15703 T16577 T18140 T18282 T18698a T18698b T18923 T1969 T20049 T21839c T3294 T4801 T5030 T5321FD T5321Fun T5631 T5642 T6048 T783 T9020 T9198 T9233 T9630 T9872d T9961 parsing001 T3064 Metric Increase: T26989 hard_hole_fits ------------------------- Co-authored-by: Sven Tennie <sven.tennie(a)gmail.com> - - - - - 26fed8ab by Matthew Pickering at 2026-06-20T23:42:52+02:00 ci: Test cross bindists We remove the special logic for testing in-tree cross compilers and instead test cross compiler bindists, like we do for all other platforms. - - - - - 80c8910e by Matthew Pickering at 2026-06-20T23:42:52+02:00 ci: Introduce CROSS_STAGE variable In preparation for building and testing stage3 bindists we introduce the CROSS_STAGE variable which is used by a CI job to determine what kind of bindist the CI job should produce. At the moment we are only using CROSS_STAGE=2 but in the future we will have some jobs which set CROSS_STAGE=3 to produce native bindists for a target, but produced by a cross compiler, which can be tested on by another CI job on the native platform. CROSS_STAGE=2: Build a normal cross compiler bindist CROSS_STAGE=3: Build a stage 3 bindist, one which is a native compiler and library for the target - - - - - 8215573d by Sven Tennie at 2026-06-20T23:42:52+02:00 ci: Increase timeout for emulators Test runs with emulators naturally take longer than on native machines. Generate jobs.yml - - - - - 5acb7dbc by Matthew Pickering at 2026-06-20T23:42:52+02:00 ci: Javascript don't set CROSS_EMULATOR There is no CROSS_EMULATOR needed to run javascript binaries, so we don't set the CROSS_EMULATOR to some dummy value. - - - - - 48345343 by Sven Tennie at 2026-06-20T23:42:52+02:00 Javascript skip T23697 See #22355 about how HSC2HS and the Javascript target don't play well together. - - - - - 5e44fd05 by Sven Tennie at 2026-06-20T23:42:52+02:00 Mark T24602 as fragile It was skipped before (due to CROSS_EMULATOR being set, which changed for JS), so we don't make things worse by marking it as fragile. - - - - - ab349ec2 by Sven Tennie at 2026-06-20T23:42:52+02:00 Fix T22744 for GHCJS In fact, this test needs Template Haskell, not necessarily an interpreter. - - - - - c73352d8 by Sven Tennie at 2026-06-20T23:42:52+02:00 haddock-test: fix GHCJS haddock test failures Add --ghc-pkg-path flag support so haddock test runner can find cross-prefixed ghc-pkg (e.g. javascript-unknown-ghcjs-ghc-pkg) which is not on $PATH in cross install directories. Skip haddockHtmlTest on GHCJS: Threaded.hs uses forkOS in a TH splice, which GHCJS RTS doesn't support. Mark with js_skip in all.T. - - - - - 5e814e76 by Andreas Klebinger at 2026-06-22T23:00:24-04:00 compiler: Deduplicate hscTidy This function was accidentally duplicated during a refactor. Fixes #27351 - - - - - 473b97eb by sheaf at 2026-06-22T23:01:22-04:00 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 - - - - - 9284a1f7 by Simon Hengel at 2026-06-23T05:55:33-04:00 Don't use global variables to address concurrency bugs! (fixes #27234) This was originally introduce with 88f38b03025386f0f1e8f5861eed67d80495168a to address #17922. In this specific case a better fix would have been to synchronize on stderr: withHandle_ "stderrSupportsAnsiColors" stderr $ \ _ -> do ... But apparently the dependency on `terminfo` was removed in 32ab07bf3d6ce45e8ea5b55e8095174a6b42a7f0, preventing #17922 in the first place. - - - - - 44309cd3 by Alan Zimmerman at 2026-06-23T05:56:20-04:00 EPA: remove LocatedL / SrcSpanAnnL and LocatedLI / SrcSpanAnnLI This is part of a refactor towards only having LocatedA / SrcSpanAnnA It removes the stated items, but has to add back one for BooleanFormula, LocatedBF / SrcSpanAnnBF This commit also use the HsConDetails RecCon extension point to capture the braces in a record constructor - - - - - 2f6a5534 by Simon Jakobi at 2026-06-23T15:46:20+02:00 Add -dstable-core-dump-order for stable Core dump ordering (#27296) The order of top-level bindings in Core dumps (-ddump-simpl etc.) is the compiler's Unique-sensitive internal processing order, so an unrelated upstream change can reorder them and defeat a textual diff of two dumps. This adds an opt-in flag -dstable-core-dump-order that reorders the top-level bindings of dumps routed through dumpPassResult into a stable, Unique-independent order, so two dumps line up across rebuilds. See Note [Stable Core dump order] in GHC.Core.Ppr for the sort key and its rationale. Adds tests T27296 (binders GHC emits in non-source order by default, asserted to come out stably ordered under the flag) and T27296b (an untidied -ddump-float-out dump pinning the ordering of the anonymous lvl floats by literal value). Co-Authored-By: Claude Opus 4.8 <noreply(a)anthropic.com> - - - - - 141986e3 by mangoiv at 2026-06-24T15:51:14-04:00 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 - - - - - aa7df6b6 by Simon Hengel at 2026-06-24T15:52:18-04:00 Set GHC_VERSION when calling custom pre-processors (see #25952) (so that pre-processors can emit backwards compatible code) - - - - - a9e494f2 by Simon Hengel at 2026-06-24T15:54:08-04:00 Add a flag to control GHCi specific error hints (close #27409) - - - - - a805b2a2 by Simon Hengel at 2026-06-24T15:55:20-04:00 Reference correct package in error messages for reexported modules (fixes #27417) - - - - - f235d183 by Simon Jakobi at 2026-06-25T05:51:18-04:00 Add explicit setBit/clearBit/complementBit for instance Bits Integer (#21176) The default setBit, clearBit, and complementBit methods allocate intermediate Integers per call. Define them explicitly via the new integerSetBit[#], integerClearBit[#] and integerComplementBit[#], built on the BigNat# primitives, which avoid those allocations. Allocation is not eliminated entirely -- the negative (IN) cases would need in-place mutation, which is left as future work. The default methods constant-folded on literal arguments via the integerOr/integerAnd/integerXor rules, which fold literal Integers of any size. The explicit functions have no such rule, so they (their Word-argument wrappers, and the Bits Integer methods) are marked INLINE to expose the underlying primops to the simplifier; see Note [INLINE for constant folding of bit operations]. This restores folding only on the small-int (IS) path -- large literal Integers (IP/IN) are no longer constant-folded, a minor regression for that case. T8832 covers the IS-path folding. The new golden-output test T21176 checks all three operations against the default implementations across the sign/size boundaries, recording each result plus its integerCheck validity. The base and ghc-bignum interface- stability export goldens gain the new functions. The main changelog entry lives in changelog.d under a new ghc-internal section (renamed from ghc-prim). CLC proposal: https://github.com/haskell/core-libraries-committee/issues/423 Co-Authored-By: Claude Opus 4.7 <noreply(a)anthropic.com> - - - - - 202ed264 by Marc Scholten at 2026-06-25T05:52:21-04:00 haddock: use Text in documentation pipeline This patch moves Haddock's documentation pipeline from String to Text where the data is already textual. It avoids repeated conversions while keeping the existing decoding behavior for invalid UTF-8 docstring chunks. The main changes are: * Render and carry docstrings as Text in Haddock-facing paths. * Use the Binary Text instance from GHC.Utils.Binary for Haddock interface files, and bump the Haddock binary interface version. * Add a FastString HTML instance so XHTML rendering avoids intermediate String allocation. * Keep HsDocStringChunk decoding lenient, matching the previous unpackHDSC behavior on invalid UTF-8 input. * Update the xhtml submodule to 3000.4.1.0, which contains the apostrophe escaping fix used by the Haddock test output. Co-authored-by: copilot-swe-agent[bot] <198982749%2BCopilot(a)users.noreply.github.com> Co-authored-by: Claude Opus 4.5 <noreply(a)anthropic.com> Assisted-by: Codex <codex(a)openai.com> - - - - - a72ff58f by mangoiv at 2026-06-25T05:53:07-04:00 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(a)gmail.com> - - - - - 6813f002 by Simon Jakobi at 2026-06-26T04:51:47-04:00 Reg.Linear: drop Platform argument from most FR (FreeRegs) methods The FR class has one instance per CPU architecture, so any architecture-constant information its methods derived from the Platform argument can instead be baked into the instance. This removes the now needless Platform argument from frAllocateReg, frGetFreeRegs and frReleaseReg. frInitFreeRegs keeps its Platform argument: the initial allocatable set is genuinely platform-dependent, see Note [Aarch64 Register x18 at Darwin and Windows]. Fixes #26665 Co-Authored-By: Claude Opus 4.8 <noreply(a)anthropic.com> - - - - - 3b2a9409 by Zubin Duggal at 2026-06-26T04:52:39-04:00 testsuite: Report fragile failures as skipped in JUnit output - - - - - 27463426 by Rodrigo Mesquita at 2026-06-26T20:54:58-04:00 perf: Share Module in Iface Symbol Table This commit modifies the structure of the serialized `SymbolTable Name` to then re-use and share the `Module` (both on disk and in memory) across all `Name`s from the same module. The new structure looks like: <total name count> $modules.size for (mod, names) in $modules: $mod $names.size for table_ix, occ in $names $table_ix $occ i.e. we put the module just once, followed by all names in that module. When deserializing, we deserialize the module just once, and all the following `Name`s are constructed with a pointer to that same decoded `Module`. In `hoogle-test`, we must use `DNameEnv` rather than `Map Name`, otherwise the output fixities order was susceptible to changes in the uniques assigned to each Names, which is not stable. Fixes #27401 ------------------------- Metric Decrease: InstanceMatching LinkableUsage01 LinkableUsage02 hard_hole_fits ------------------------- - - - - - 412f1675 by Simon Hengel at 2026-06-26T20:55:41-04:00 Rename `MCDiagnostic` to `InternalMCDiagnostic` `MCDiagnostic` is meant to be used for compiler diagnostics. Any code that creates `MCDiagnostic` directly, without going through `GHC.Driver.Errors.printMessage`, sidesteps `-fdiagnostics-as-json` (see e.g. !14616, !14475, !14492 !14548). To avoid this in the future, this change more narrowly controls who creates `MCDiagnostic` (see #24113). - - - - - 6f212121 by Facundo Domínguez at 2026-06-26T20:56:27-04:00 Encapsulate options of occurAnalysePgm in a record - - - - - adfbb179 by Facundo Domínguez at 2026-06-26T20:56:27-04:00 Allow to configure the occurrence analyser to retain some dead bindings This is needed by plugins that are the only consumers of a binding which is otherwise unused in the program. See Note [Controlling elimination of dead bindings in occurrence analysis] added in this commit, or https://gitlab.haskell.org/ghc/ghc/-/issues/27240 for more discussion. - - - - - c745b11f by Copilot at 2026-06-26T20:56:27-04:00 Address documentation feedback - - - - - 2c2a4a2a by Copilot at 2026-06-26T20:56:27-04:00 Keep the imp_rules parameter of occurPgmAnalysePgm and add occ_opts to OccEnv - - - - - e2262b0e by Copilot at 2026-06-26T20:56:27-04:00 Strengthen T27240.hs with a binding that should be removed - - - - - 5f9d9268 by Copilot at 2026-06-26T20:56:27-04:00 Move the reference #27240 to a related paragraph - - - - - d86d2644 by Simon Hengel at 2026-06-26T20:57:10-04:00 Remove deprecated flag `-ddump-json` (see #24113) This was first deprecated in 9.10.1. - - - - - 3b15ff03 by Simon Jakobi at 2026-06-27T18:48:34+02:00 Tweak mk_mod_usage_info * Use O(log n) `elemModuleEnv` instead of O(n) `elem` to filter the direct imports. * Use `nonDetModuleEnvKeys` to avoid sorting the ent_map keys twice. * Prepend the presumably shorter list when creating all_mods with `(++)`. Actually this eliminates the `(++)` entirely, as it seems to fuse with the `filter` expression. As a result there is a tiny speed-up when generating the .hi-files for modules with many imports. None of the changes affect compilation determinism as the module list is explicitly sorted to ensure a canonical order. - - - - - 2d0fd154 by Alan Zimmerman at 2026-06-29T11:44:00-04:00 EPA: Remove LocatedC / SrcSpanAnnC This is part of a cleanup of the zoo of SrcSpanAnnXXX types for exact print annotations. This one removes SrcSpanAnnC used for storing exact print annotations for contexts. It replaces it with an explicit `HsContext` data type that carries the annotations and the context. So, replace type HsContext pass = [LHsType pass] with type HsContext pass = HsContextDetails pass (LHsType pass) data HsContextDetails pass arg = HsContext { hsc_ext :: !(XHsContext pass) , hsc_ctxt :: [arg] } | XHsContextDetails !(XXHsContextDetails pass) We need the parameterised HsContextDetails because it is used both for HsQual carrying 'LHsExpr p' and "normal" contexts carrying 'LHsType p'. - - - - - cca0d589 by Luite Stegeman at 2026-06-30T13:33:40-04:00 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 - - - - - 42935858 by Luite Stegeman at 2026-06-30T13:33:40-04:00 testsuite: use compacting_gc way instead of hardcoding +RTS -c - - - - - bf7b5ce6 by Alan Zimmerman at 2026-06-30T13:34:23-04:00 EPA: Remove LocatedLW from LStmtLR HsDo already had its XDo extension point for an AnnList, which also appeared in LocatedLW. So we remove the redundant one and use the one inside HsDo as originally intended. Also delete LocatedLC/LocatedLS as they were unused - - - - - d7cfea49 by Recursion Ninja at 2026-06-30T21:37:12-04:00 Decoupling 'L.H.S' from 'GHC.Types.SourceText' * Migrated 'IntegralLit' to 'L.H.S.Lit'. * Migrated 'FractionalLit' to 'L.H.S.Lit'. * Migrated 'StringLiteral' to 'L.H.S.Lit'. * Added TTG extension points to the types above. * Added nice export list to 'GHC.Hs.Lit'. * Added 'rnOverLitVal' and 'tcOverLitVal' functions to 'GHC.Hs.Lit'. * Added instance 'Anno (StringLiteral (GhcPass p)) = SrcSpanAnnN' * Moved [Notes] about 'SourceText' from 'L.H.S.*' to 'GHC.*'. * Removed all references to 'SourceText' from 'L.H.S'. * Removed the trailing comma record field from 'StringLiteral' * Renamed exported functions for nomenclature consistency. * Deprecated the renamed functions Fixes #26953 - - - - - a1f2558b by Recursion Ninja at 2026-06-30T21:37:12-04:00 Monomorphising GHC pass parameters where appropriate - - - - - 7bf9e3c5 by Teo Camarasu at 2026-06-30T21:38:03-04:00 Make Q abstract This patch aims to clearly demarcate the internal and external interfaces of Q. In the past the `Quasi` typeclass was both part of the external, public-facing interface, and was used to give the implementation of `Q`. Now we separate out these two distinct roles. `Quasi` continues to exist in the public interface, but we introduce a new `MetaHandlers` type, which is equivalent to `Dict Quasi`. `Q a` is now defined to be `MetaHandlers -> IO a`, and, crucially, the constructor and the new `MetaHandlers` type are not exposed from the public interface. This gives us the ability to vary the interface on the GHC side without forcing a breaking change on the `template-haskell` side. Similarly `template-haskell` has more freedom to change the `Quasi` typeclass without needing any changes in `lib:ghc`. Implements https://github.com/ghc-proposals/ghc-proposals/pull/700 Resolves #27341 - - - - - 4262af36 by L0neGamer at 2026-06-30T21:38:56-04:00 generically defines mconcat in terms of internal type's Semigroup instance add changelog entry use simpler definition for mconcat `nonEmpty` isn't available yet; inline branches in case add test case fixup generically defines mconcat in terms of internal type's Semigroup instance add comment on Generically and deriving mishaps swap mconcat to foldr version add some strictness testing for mconcat add to `base` changelog entry - - - - - e22ad997 by Cheng Shao at 2026-06-30T21:39:43-04:00 hadrian/rts: fix unregisterised build for gcc 15+ This patch fixes unregisterised build for gcc 15+: - Pass -optc-Wno-error in hadrian when +werror enables -optc-Werror, see added comment for details. - For RTS functions that the codegen would emit calls, ensure their real prototype is hidden when the header is included in .hc fies (IN_STG_CODE), and the dummy prototype is provided to match the EFF_ convention. In the future we should get rid of EFF_ (#14647) and remove these hacks, but for now this patch makes unregisterised work again on newer toolchains. Fixes #27404. Co-authored-by: Codex <codex(a)openai.com> - - - - - 3f00f234 by Cheng Shao at 2026-06-30T21:40:32-04:00 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(a)openai.com> - - - - - 701088db by Ben Gamari at 2026-07-01T10:34:03-04:00 gitlab-ci: Drop vestigial references to make build system - - - - - 62d54a53 by Ben Gamari at 2026-07-01T10:34:03-04:00 gitlab-ci: Add support for running specifying a job's testsuite ways - - - - - 7f97ac2c by Ben Gamari at 2026-07-01T10:34:03-04:00 gitlab-ci: Run llvm testsuite ways in llvm jobs Addresses #25762. - - - - - 7ea75116 by ARATA Mizuki at 2026-07-01T10:34:03-04:00 testsuite: Add normalise_ddump_deriv setup function Some tests check the result of -ddump-deriv, which may contain INLINE pragmas depending on optimization flags. With normalise_ddump_deriv setup function, INLINE pragmas are stripped off. - - - - - c7a8199f by ARATA Mizuki at 2026-07-01T10:34:03-04:00 testsuite: Use -dsuppress-idinfo to make tests more robust Previously, T18052a and T21755 were failing on 'optasm' and 'optllvm' ways because of visibility of unfoldings. - - - - - a12122e5 by ARATA Mizuki at 2026-07-01T10:34:03-04:00 testsuite: Use a trick to keep large objects alive Previously, T17574 and T19381 were failing on 'optasm' and 'optllvm' ways because of compiler optimizations. Change them to use NOINLINE to prevent unwanted optimizations. - - - - - 1a95b327 by ARATA Mizuki at 2026-07-01T10:34:03-04:00 testsuite: Only run T24224 in 'normal' way This test is a frontend-only one and breaks if optimizations are enabled. - - - - - 8abea737 by ARATA Mizuki at 2026-07-01T10:34:03-04:00 testsuite: Ignore T18118's stderr When optimizations are enabled, the compiler emits a warning (You cannot SPECIALISE ...). The message is not important, so ignore it. - - - - - 9453a722 by ARATA Mizuki at 2026-07-01T10:34:03-04:00 testsuite: Mark T816 and tc216 broken with optimizations These tests are about type checking, so we should not care too much if they are broken with optimizations. See #26952 - - - - - 0aef9ec0 by Ben Gamari at 2026-07-01T10:34:03-04:00 testsuite: ds014 is not longer broken It now appears to pass in the ways it was marked as broken in. Closes #14901. - - - - - 4692d1e4 by Ben Gamari at 2026-07-01T10:34:03-04:00 testsuite: Only run stack cloning tests in the normal way These are too dependent upon code generation specifics to pass in most other ways. - - - - - c154df26 by ARATA Mizuki at 2026-07-01T10:34:03-04:00 testsuite: Update options_ghc_fbyte-code The `-fbyte-code` option used to be overriden by `-fllvm` but it is no longer true since !14872 was merged. I updated the test to accept the new behavior. Closes #27049 - - - - - 5d8bb7b5 by ARATA Mizuki at 2026-07-01T10:34:03-04:00 testsuite: Only run T22744 in 'normal' way This test takes a long time on optimized ways. - - - - - d1e74c8e by ARATA Mizuki at 2026-07-01T10:34:03-04:00 testsuite: Disable tests that use -finfo-table-map on llvm ways Currently, -finfo-table-map does not work with -fllvm. See #26435 - - - - - 3bf38c84 by ARATA Mizuki at 2026-07-01T10:34:03-04:00 testsuite: Don't run T24726 on optimized ways If optimizations are enabled, the rewrite rule just fires and -drule-check will report nothing. - - - - - e4eef116 by ARATA Mizuki at 2026-07-01T10:34:03-04:00 testsuite: Use -fno-unoptimized-core-for-interpreter when running LinkableUsage01/02 Optimizations for the bytecode interpreter are considered experimental, and need a flag to be enabled. - - - - - 234a9872 by ARATA Mizuki at 2026-07-01T10:34:03-04:00 testsuite: Suppress unwanted optimizations on T25284 - - - - - 99a2af2f by ARATA Mizuki at 2026-07-01T10:34:03-04:00 testsuite: Don't run stack_big_ret with optimizations Stack layout may change with optimizations enabled. - - - - - 04c836df by ARATA Mizuki at 2026-07-01T10:34:04-04:00 testsuite: Mark memo001 broken on optimized ways See #27396 - - - - - 1a8a24f4 by ARATA Mizuki at 2026-07-01T10:34:04-04:00 testsuite: Mark syn-perf broken on optimized ways See #27398 - - - - - 40412093 by Duncan Coutts at 2026-07-01T10:34:50-04:00 Add a test for thread scheduler fairness It also tests that the interval timer and context switching works. We also test that fairness is lost when the context switching interval is too coarse for the duration of the test. We add this test before doing surgery on the interval timer, so we have decent coverage. - - - - - 3f34d557 by Duncan Coutts at 2026-07-01T10:34:50-04:00 Make exported stop/startTimer no-ops, and rename internal functions Specifically, internally rename: stop/startTimer to pause/unpauseTimer stop/startTicker to pause/unpauseTicker and keep stop/startTimer as exported functions, but now as no-ops. In the past the stop/startTicker actions were used incorrectly as if they were synchronous, which they are not. See issue #27105. We now document pause/unpackTicker as being async and not to be used for the purpose of concurrency safety. The existing stop/startTimer (note Timer not Ticker, the Timer calls the Ticker!) are also exported from the RTS as a public API. This was historically because the ticker used signals and it was important to suspend the timer signel over a process fork. So these functions were exported to be used by the process and unix libraries. We cannot just remove the RTS exports, but we now make them no-ops, and they can be removed from the process and unix library later. This was already documented in a changelog.d entry no-more-timer-signal but due to changes during the MR process the change to make stop/startTicker into no-ops didn't make it into the earlier MR. - - - - - 02e84e5f by Duncan Coutts at 2026-07-01T10:34:51-04:00 Make exitTicker/exitTimer unconditionally synchronous We never use them asynchronously, and we should never need to do so. And update some related comments. - - - - - 13db6a72 by Duncan Coutts at 2026-07-01T10:34:51-04:00 posix ticker: update and improve comments on (un)pause and exit Clarify what is async vs sync. - - - - - 43d9a07d by Duncan Coutts at 2026-07-01T10:34:51-04:00 posix ticker: split out ppoll/select helper functions Move the #ifdefs out of the main code body by introducing local helper functions and types, which themselves have two implementations (with a common API) based on ppoll or select. This helps improve clarity/readability. - - - - - a5491baa by Duncan Coutts at 2026-07-01T10:34:51-04:00 posix ticker: improve the implementation The existing implementation supported pausing and exiting, with the implementation of pausing reling on a mutex and condition variable. It needed to check the pause and stop shared variables on every iteration. It relies on ppoll or select, to wait on the timeout and also wait on an interrupt fd. The interrupt fd was only used for prompt exit/shutdown, and not for pausing or other notification. The pause only needed a lock and a memory operation, but the pause was not prompt. The resume used a lock, and signaling a cond var. The new implementation uses a somewhat more regular design: every notification is done by setting a shared variable and interrupting/notifying the ticker via the fd. The ticker thread does not need to check any shared variables on normal timer expiry, only when it recevies notification. This may be a micro-optimisation, but the tick occurs 100 times a second by default so any improvements in the hot path are amplified. When the ticker thread does receive notification it can check the various shared variables and update its local state. The blocking relies on using ppoll/select but without a timeout. This avoids the condition var and also allows further notifications when paused (also used for unpausing). This design can be extended with further notification types if needed by using and checking further shared vars (or making existing shared vars an enum or counter). This may be used in future for additional notifications to the ticker thread. This will likely be used to proxy wakeUpRts from a single handler context for example. And this approach, avoiding mutexes, is compatible with use from signal handlers. So overall, it's: * slightly simpler / more regular; * easier to extend with additional notifications; * probably slightly more efficient (but a micro-optimisation); * and supports calling notification from signal handlers - - - - - 5b20821e by Duncan Coutts at 2026-07-01T10:34:51-04:00 posix ticker: further minor local renaming for code clarity Improve the clarity with better choice of names for several local vars and function. - - - - - 1f3ec5e0 by Duncan Coutts at 2026-07-01T10:34:51-04:00 win32 ticker: split out local helper functions - - - - - 596e7307 by Duncan Coutts at 2026-07-01T10:34:51-04:00 win32 ticker: provide guarantee about concurrency and idempotency Use a lock to ensure pause/unpause can be used concurrently. Use a paused variable, protected by the lock, to ensure that pause and unpause are both idempotent. This is what the portable API expects. - - - - - 1870edd7 by Duncan Coutts at 2026-07-01T10:34:51-04:00 win32 ticker: make the initial tick be after one wait interval There is no need to tick immediately. This is consistent with the posix implementation. - - - - - 7c15ab5b by Duncan Coutts at 2026-07-01T10:34:51-04:00 ticker: remove now-unnecessary layer of enable/disable There was an atomic variable used to block *part* of the actions of the tick handler. This still did not make stopTimer synchronous, even for the part of the the handle_tick actions it covered. It also added a more expensive (sequentuially consistent) atomic operation in the hot path for the handle_tick action, whereas our new design requires no atomic ops at all. Now that we have eliminate the need for synchronous stop/startTicker, we don't need this not-quite-working-anyway atomic protocol. The new pause/unpauseTicker is explicitly asynchronous and idempotent. - - - - - 8585f8cb by Duncan Coutts at 2026-07-01T10:34:51-04:00 ticker: add TODOs about issue #27250: too much being done from handle_tick The handle_tick should not perform I/O, block, perform long-running operations or call arbitrary user code. Unfortunately, everything to do with the eventlog (at the moment) falls into all those categories. - - - - - 6e381626 by Duncan Coutts at 2026-07-01T22:29:55+01:00 Adjust releaseCapability_ precondition to allow cap->running_task == NULL There are two use cases for releaseCapability_: 1. The current Task (cap->running_task) releases the Capability. The Capability is marked free, and if there is any work to do, an appropriate Task is woken up. 2. There is no current task (cap->task == NULL), and thus the Capability is idle, and we want to wake up an idle Task to animate the Capability. This case uses always_wakeup. Currently, the precondition for releaseCapability_ is cap->running_task != NULL and so the 2nd use cases have to set cap->running_task (which is then immediately overwritten) just to satisfy the precondition. See the use cases in sendMessage and prodCapability. So we can relax the precondition to be: cap->running_task != NULL || always_wakeup so that in the always_wakeup case, we say it is ok for the cap->running_task to be NULL. This lets us simplify sendMessage and prodCapability. In particular it will allow prodCapability to not need a Task parameter. The ulterior motive for all this is that I want to be able to call prodCapability from an OS thread that is not itself a Task, in persuit of issue #27086: disentangle I/O managers from wakeUpRts. The most straightforward way to wake the RTS is using prodCapability, but the context in which we will need to do that are threads that are not Tasks. - - - - - 89404ebc by Duncan Coutts at 2026-07-01T22:29:55+01:00 prodCapability no longer needs to take a Task param Now that releaseCapability_ can accept cap->running_task == NULL then it is no longer necessary for prodCapability to require a Task. - - - - - 4e60c5f6 by Duncan Coutts at 2026-07-01T22:29:56+01:00 Define prodOneCapability There was an existing declaration for this in the header file, but no definition. Similarly, there is a declaration for prodAllCapabilities but no definition, and we don't need it, so remove the declaration. - - - - - 2527026f by Duncan Coutts at 2026-07-01T22:29:56+01:00 Add a wakeUpRtsViaTicker feature to the posix ticker It proxies a call to wakeUpRts, but crucially, this can be called from a signal handler context. It will be used for ctl-c handling. - - - - - aa5a03a5 by Duncan Coutts at 2026-07-01T22:29:56+01:00 Change how wakeUpRts works Previously it would call wakeupIOManager to get a capability to wake up and run. This works but it entangles the I/O managers with unrelated features: ctl-c handling and idle gc (the two features that use wakeUpRts). The reason it used wakeupIOManager is that this action is safe to use from a posix signal handler, since it just posts bytes to a pipe. Otherwise the more direct approach (used e.g. by sendMessage when the target capability is idle) is to use releaseCapability. But that uses condition variables and mutexes, which are not safe to use from within a signal handler. So instead of entangling the (multiple) I/O managers with this, we make wakeUpRts use the direct approach (using prodOneCapability). On win32 the ctl-c console handler can call wakeUpRts directly, since it is called in a proper thread. On posix, to deal with the signal handler problem, we make the signal handler ask the ticker thread to proxy the call to wakeUpRts, since the ticker thread is also a proper thread. This will allow the I/O managers to no longer be concerned with this. This is good because there are many I/O managers (and they're complicated), but there is (on posix) only one ticker implementation. So this is an overall reduction in coupling and complexity. Fixes issue #27086 - - - - - c6d53c16 by sheaf at 2026-07-02T21:35:44-04:00 Test driver: normalise line numbers into libraries When comparing the stdout of tests that print out callstacks, we can't rely on the stability of exact line:column spans pointing into libraries (e.g. ghc-internal), as any change (such as adding a comment) can change them. This commit addresses this by normalising away line:column in callstacks, but only when those point into internal libraries. We don't do this in general, as the exact span might be important to the test (e.g. for a span within the test module itself). Fixes #27387 - - - - - 81ee62e0 by Alan Zimmerman at 2026-07-02T21:36:33-04:00 EPA: Remove LocatedLW from MatchGroup This is the last usage of LocatedLW / SrcSpanAnnLW - - - - - 925959db by Recursion Ninja at 2026-07-04T04:14:12-04:00 Decoupling 'L.H.S' from 'GHC.Hs.Doc' * Migrated 'GHC.Hs.Doc' and 'GHC.Hs.DocString' AST defintions from 'GHC.*' namespace, to new 'Language.Haskell.Syntax.Doc' module in the 'L.H.S' "namespace." * Updated 'HsDocString to be TTG-parameterised as 'HsDocString pass'. * Added 'GHC.Hs.Extension.Pass': splits 'GhcPass'/'Pass' and all 'HsDocString' TTG instances out of 'GHC.Hs.Extension', which re-exports it unchanged (this is backwards compatible and prevents the introduction of a boot file). * Deleted 'GHC.Hs.Doc.hs-boot'; removed all 'L.H.S.*' imports of 'GHC.Hs.Doc'. * Updated 'GHC.Hs.DocString' to be TTG pass-parameterised throughout; moved 'mkHsDocStringChunk'/'unpackHDSC' here (require 'GHC.Utils.Encoding'). * Split 'GHC.Rename.Doc.rnHsDoc' from 'rnHsDocIdentifiersOnly'. * Updated parser, renamer, typechecker, HIE, and exact-print for new types. * Added 'HsDocString' TTG instances for 'DocNameI' to 'Haddock.Types'. * Killed the last module loop between GHC.* and LHS.*. - Only edges from LHS.* to GHC.Data.FastString now! Resolves #26971 - - - - - b7e24044 by mangoiv at 2026-07-04T04:14:56-04:00 ci: retry fetching test metrics Retry fetching test metrics to make the CI not fail if the services is temporarily unavailable - - - - - 4180af3f by Zubin Duggal at 2026-07-04T04:15:38-04:00 Bump semaphore-compat submodule to 2.0.1 This versions includes some cruicial fixes for darwin - - - - - 242d4317 by sheaf at 2026-07-04T04:16:19-04:00 Remove outdated comment in GHC.Data.ShortText There was a long comment in GHC.Data.ShortText about a workaround that was necessary when bootstrapping with GHC 9.2 and below. The actual logic has since been dropped, but the comment remained. This commit removes the vestigial comment. - - - - - 9b714c4c by Zubin Duggal at 2026-07-05T09:40:36+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 - - - - - 4a59b3ee by Zubin Duggal at 2026-07-05T09:40:36+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 - - - - - 383ddcd4 by Alan Zimmerman at 2026-07-06T07:08:16-04:00 EPA: Move the 'where' annotation for PatSynBind This allows us to move it out of the MatchGroup exact print annotation too - - - - - 66d1a5d5 by fendor at 2026-07-07T16:57:56-04:00 Add 'backendInfoTableMapValidity' backend predicate Check whether the backend supports the `-finfo-table-map` flag and ignore it otherwise. Improve by-design documentation of `backendCodeOutput`. `Backend` is **abstract by design**. Make this clearer in `backendCodeOutput` which is incorrectly being used as a proxy for `Backend`. Instead, define the desired property predicates in GHC.Driver.Backend In the process, make `backendCodeOutput` total. - - - - - 74f1071d by fendor at 2026-07-07T16:57:56-04:00 Add failing test for `-finfo-table-map` and bytecode backend If you compile a module using the bytecode backend, with -finfo-table-map, then the info table map doesn't get populated for the module. This is because the -finfo-table-map code path is implemented mostly in the StgToCmm phase which isn't run when creating bytecode. Ticket #27039 - - - - - 28d63bca by mangoiv at 2026-07-07T16:59:16-04:00 ci: don't fail nightly if there have been no changes that night Fixes #27127 - - - - - 4ebfc478 by Rodrigo Mesquita at 2026-07-08T04:47:53-04:00 ttg: Using ShortText over FastString in the AST To make the AST independent of GHC, this commit replaces usages of `FastString` with `HText` in the AST, killing the last edge from Language.Haskell.* to GHC.* modules. Even though we /do/ want to use FastStrings in general -- critically in Names or Ids -- there is no particular reason for the FastStrings that occur in the AST proper to be FastStrings. Strings in the AST are typically unique and don't benefit particularly from being interned FastStrings with Uniques for fast comparison. `HText` is a type synonym for `ShortText` which uses GHC's Modified UTF-8 encoding exclusively. Modified UTF-8 must be used to represent the Haskell AST because the Haskell Report allows surrogate code points. `Data.Text.Text` functions use Standard UTF-8 which replace surrogates with a placeholder value, thus `Data.Text.Text` is unsuitable for AST strings. See the `Language.Haskell.Syntax.Text` module header for more details. Final progress towards #21592 Closes #21628 - - - - - d910b353 by Simon Peyton Jones at 2026-07-08T04:48:36-04:00 Update equality-type documenation in GHC.Builtin.Types.Prim Fix #27466 - - - - - b2530542 by Simon Peyton Jones at 2026-07-08T04:48:36-04:00 Honour -dsuppress-coercions in GHC.Core.TyCo.pprCo Fixes #27467 - - - - - 9a73179a by Facundo Domínguez at 2026-07-08T04:49:26-04:00 Add item to MR checklist asking to squash fixup commits after approval The checklist has an item that reads All commits are either individually buildable or squashed. This item could be checked immediately after sending the merge request though. If reviewers ask for amends later on, and the author amends the merge request, there was no item that would remind the contributors to squash the fixup commits before landing. This commit adds a new item After all approvals and before landing: all fixup commits are squashed with their originating commits. which should be harder to mark as done before approvals have been given. - - - - - ed09895d by Andreas Klebinger at 2026-07-08T16:53:27-04:00 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. - - - - - 67c03eb2 by Cheng Shao at 2026-07-08T16:54:09-04:00 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(a)openai.com> - - - - - 2ecabb4f by Zubin Duggal at 2026-07-09T09:23:25-04:00 hadrian: binary-dist-dir should not be the default target Revert behaviour to pre 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2 In 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2, we applied the following behaviour change: ``` hadrian: Build stage 2 cross compilers ... * hadrian: Make binary-dist-dir the default build target. This allows us to have the logic in one place about which libraries/stages to build with cross compilers. Fixes #24192 ``` This is a major regression to development experience, a plain hadrian/build --freeze1 now takes ages because we rebuild all docs (which need to go in the binary dist dir). `binary-dist-dir` is the wrong default target for regular GHC development work Fixes #27445 - - - - - e16388e3 by Zubin Duggal at 2026-07-09T09:23:25-04:00 .gitignore: Add the hadrian system.config introduced by commit 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2 Since commit 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2 Author: Matthew Pickering <matthewtpickering(a)gmail.com> Date: Thu Dec 21 16:17:41 2023 +0000 hadrian: Build stage 2 cross compilers ./configure produces /hadrian/cfg/system.config.{host,target} Add these to .gitignore - - - - - 7e8abf41 by Alan Zimmerman at 2026-07-09T09:24:12-04:00 EPA: Replace AnnListItem with simply [TrailingAnn] Remove the unnecessary wrapper around a single field. - - - - - 29032f17 by Zubin Duggal at 2026-07-09T09:24:58-04:00 testsuite: Keep real reason for fragile test failures - - - - - c34e03a7 by Zubin Duggal at 2026-07-09T09:24:58-04:00 testsuite: Fall back to the failure reason for empty JUnit bodies - - - - - 409d40f0 by Zubin Duggal at 2026-07-09T09:24:58-04:00 testsuite: Show output diffs in JUnit output Also refactor compare_outputs to return essentially a `Maybe Diff` (`CompareOutput`) instead of a bool, but more pythonic. This allows us to pass the diff through nice. - - - - - 06fee1ab by Zubin Duggal at 2026-07-09T09:24:58-04:00 perf notes: include stat deviation and acceptance window in notes so they show up in gitlab - - - - - 57c0f32c by mangoiv at 2026-07-10T11:08:38-04:00 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 - - - - - 4396a6f2 by Andrea Vezzosi at 2026-07-10T11:09:25-04:00 [Fix #27287] preserve ModBreaks in ModIface - - - - - ed261a7e by Cheng Shao at 2026-07-14T17:59:38-04:00 hadrian: fix HLS support This patch fixes hadrian's HLS support so one can rely on HLS when working on the hadrian codebase. Fixes #27480. Not building/linking shared libraries for hadrian is a severely premature optimization; this top-level setting in `cabal.project` only affects home packages while the dependencies in the cabal store are built with vanilla/dynamic anyway, and even adding dynamic builds to home packages would not be costly due to cabal's usage of `-dynamic-too`. - - - - - eee8ec5b by Cheng Shao at 2026-07-14T18:00:20-04:00 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(a)openai.com> - - - - - 1718230f by Alan Zimmerman at 2026-07-14T18:01:06-04:00 EPA: Keep binds and sigs together in HsValBindsLR We combine them into a single list for GhcPs, wrapped in the ValBind data type, which is the bind equivalent of ValD, having constructors for binds and sigs. This simplifies exact print processing, especially when using it to update the contents of local binds, as we no longer need AnnSortKey BindTag - - - - - 6bd1ad2a by Andreas Klebinger at 2026-07-14T18:01:49-04:00 Bump nofib submodule to account for MonoLocalBinds. New versions of GHC enable MonoLocalBinds by default. This breaks some of the benchmarks. I've fixed this and this bump pulls in that fix. - - - - - 7eb0f1c9 by Cheng Shao at 2026-07-14T18:02:31-04:00 testsuite: fix bytecodeIPE test under +ipe flavours This patch fixes the bytecodeIPE test under +ipe flavours. It used to fail under +ipe because the RTS is built with IPE info, then stg_AP_info in RTS carries IPE info, so whereFrom wouldn't return Nothing. Now the test checks IPE info of a datacon in the ghci-loaded module which is not affected by whether the RTS is built with IPE info or not. Fixes #27498. Co-authored-by: Codex <codex(a)openai.com> - - - - - ef038aae by cydparser at 2026-07-15T04:35:41-04:00 Reduce bytes allocated for `capabilities` in RTS (fixes #27487) In rts/Capability.c, `capabilities` is an array of pointers, but it was allocated as if it were an array of Capability's. - - - - - d377e83e by Cheng Shao at 2026-07-15T04:36:27-04:00 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(a)openai.com> - - - - - 8ed03842 by Cheng Shao at 2026-07-15T04:36:27-04:00 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(a)openai.com> - - - - - 5aa7000a by Cheng Shao at 2026-07-15T04:37:08-04:00 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(a)openai.com> - - - - - d43a7b7a by Brian McKenna at 2026-07-15T20:10:04+02:00 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 - - - - - ede4b17b by Ben Gamari at 2026-07-15T22:59:53-04:00 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. - - - - - 0f64f348 by Cheng Shao at 2026-07-16T15:41:08+00:00 ci: add missing docker permission workaround in abi-test job - - - - - 660cb239 by Cheng Shao at 2026-07-16T19:37:48+00:00 bindist: Fix make install -j race condition on macos/freebsd This patch fixes make install -j race condition on macos/freebsd. BSD install fails with EEXIST when multiple install processes concurrently create the same prefix directory. So we add an `install_dirs` prerequisite job that sequentially creates the directories for subsequent jobs to work with. Fixes #27499. Co-authored-by: Codex <codex(a)openai.com> - - - - - 08130257 by Cheng Shao at 2026-07-16T19:37:48+00:00 ci: run bindist make install with -j This patch makes the ci scripts run `make install` with `-j` to reduce wall clock time when installing the bindist, see related issue for benchmark numbers. This only affects ghc ci logic, the user-facing default is up to distributors and is still `-j1`. Closes #27029. - - - - - d5ae6906 by Adam Gundry at 2026-07-17T04:57:43-04:00 Mark various language extension flags as deprecated (see #27329) The following language extensions are now deprecated: - AlternativeLayoutRule - AlternativeLayoutRuleTransitional - ParallelArrays - PolymorphicComponents - Rank2Types In addition, the warning `-Walternative-layout-rule-transitional` has been marked as deprecated, as it is emitted only under the deprecated extension `XAlternativeLayoutRuleTransitional`. - - - - - fe3b059c by Andrew Lelechenko at 2026-07-17T04:58:26-04:00 base: re-export GHC.Environment.getFullArgs from System.Environment CLC proposal https://github.com/haskell/core-libraries-committee/issues/431 - - - - - 722236dd by sheaf at 2026-07-18T08:48:31-04:00 Coercion optimisation: avoid double-Sym for InstCo Ticket #27374 pointed out an issue with GHC.Core.Coercion.Opt.optCoercion's handling of InstCo: it contravened (LC2) in Note [The LiftingContext in optCoercion] because it applied the ambient 'sym' to a coercion that was then added to the lifting context substitution. Fixes #27374 Co-authored-by: Simon Jakobi <simon.jakobi(a)gmail.com> - - - - - ff70fc75 by sheaf at 2026-07-18T08:48:31-04:00 Coercion optimisation: avoid exponential behaviour The change to coercion optimisation of 'InstCo' in the previous commit introduces exponential behaviour to the coercion optimiser. To avoid this, this commit provides a way to push in 'Sym' of an already-optimised coercion: GHC.Core.Coercion.Opt.mkDeepSymCo. See Note [Pushing Sym without re-optimising] in GHC.Core.Coercion.Opt. - - - - - dfef27f0 by Duncan Coutts at 2026-07-18T08:49:12-04:00 Move THREADED_RTS-conditional struct members to end of Capability Accessing members of the Capability struct from CMM code rely on accessor macros. (The macros are generated by deriveConstants). These macros have a single definition. This means that the offsets of all struct members must *not* vary based on THREADED_RTS vs !THREADED_RTS. This requires that any struct members that are conditional on THREADED_RTS must occur after the unconditional struct members. Hence we move all the ones that are conditional on THREADED_RTS to the end. Add a deriveConstants entry for the iomgr member of the Capability struct, which was the motivation for this change. Add warning messages to help our future selves. Debugging this took me a couple hours in gdb! - - - - - c254e022 by Duncan Coutts at 2026-07-18T08:49:12-04:00 Make the IOManager API use CapIOManager rather than Capability This makes the API somewhat more self-contained and more consistent. Now the IOManager API and each of the backends takes just the I/O manager structure. Previously we had a bit of a mixture, depending on whether the function needed access to the Capability or just the CapIOManager. We still need access to the cap, so we introduce a back reference to reach the capability, via iomgr->cap. Convert all uses in select and poll backends, but not win32 ones. Convert callers in the scheduler and elsewhere. Also convert the three CMM primops that call IOManager APIs. They just need to use Capability_iomgr(MyCapability()). - - - - - 4f3d8f31 by Duncan Coutts at 2026-07-18T08:49:12-04:00 Split posix/MIO.c out of posix/Signals.c The MIO I/O manager was secretly living inside the Signals file. Now it gets its own file, like any other self-respecting I/O manager. - - - - - 52ce04a9 by Duncan Coutts at 2026-07-18T08:49:12-04:00 Rationalise some scheduler run queue utilities Move them all to the same place in the file. Make some static that were used only internally. Also remove a redundant assignment after calling truncateRunQueue that is already done within truncateRunQueue. - - - - - 75bbdebc by Duncan Coutts at 2026-07-18T08:49:12-04:00 Rename initIOManager{AfterFork} to {re}startIOManager These are more accurate names, since these actions happen after initialisation and are really about starting (or restarting) background threads. - - - - - 724c0517 by Duncan Coutts at 2026-07-18T08:49:12-04:00 Free per-cap I/O managers during shutdown and forkProcess Historically this was not strictly necessary. The select and win32 legacy I/O managers did not maintain any dynamically allocated resources. The new poll one does (an auxillary table), and so this should be freed. After forkProcess, all threads get deleted. This includes threads waiting on I/O or timers. So as of this patch, resetting the I/O manager is just about tidying things up. For example, for the poll I/O manager this will reset the size of the AIOP table (which otherwise grows but never shrinks). In future however the re-initialising will become neeecessary for functionality, since some I/O managers will need to re-initialise wakeup fds that are set CLOEXEC. - - - - - c007d122 by Duncan Coutts at 2026-07-18T08:49:12-04:00 Add a TODO to the MIO I/O manager The direction of travel is to make I/O managers per-capability and have all their state live in the struct CapIOManager. The MIO I/O manager however still has a number of global variables. It's not obvious how handle these globals however. - - - - - b65ab7b3 by Duncan Coutts at 2026-07-18T08:49:12-04:00 Add a FIXME note in the Poll I/O manager - - - - - daf2bd6f by Duncan Coutts at 2026-07-18T08:49:12-04:00 Add missing updateRemembSetPushClosure in poll I/O manager For the non-moving GC. - - - - - e33ca830 by Duncan Coutts at 2026-07-18T08:49:12-04:00 Minor doc improvement to struct StgAsyncIOOp member outcome Mention the enumeration names, as well as their numeric values. The rest of the code uses the enum names. - - - - - 4edd2579 by Duncan Coutts at 2026-07-18T08:49:12-04:00 Minor doc improvements for StgTSOBlockInfo Clarify that certain union members are used only by certain legacy I/O managers. Hopefully we will be able to remove these at some point. - - - - - 536bedbb by Duncan Coutts at 2026-07-18T08:49:12-04:00 Avoid exporting various win32-specific rts symbols The BeginPrivate.h / EndPrivate.h scheme works perfectly well on Windows, but all of the rts/win32/*.h files were not using it. - - - - - 8139b5ac by Duncan Coutts at 2026-07-18T08:49:12-04:00 Remove wakeupIOManager, ioManagerWakeup and setIOManagerWakeupFd We no longer need wakeupIOManager for the threaded RTS case, so we can remove it and the bits only needed to support it. This includes the pipe/eventfd fd shared between the RTS and the in-library I/O manager used for waking up the I/O manager thread. The pipe/eventfd still exists, but it no longer has to be communicated to the RTS, since the RTS no longer needs to use it. So we remove the RTS API export setIOManagerWakeupFd, and remove uses of it within the I/O managers in ghc-internal. - - - - - 74fe7c66 by Duncan Coutts at 2026-07-18T08:49:12-04:00 Add a new interruptIOManager API for the I/O managers It will be used to interrupt awaitCompletedTimeoutsOrIO. Also update the return type and docs for awaitCompletedTimeoutsOrIO to have it return false when it gets interrupted, and have no useful post condition in that case. - - - - - 38792843 by Duncan Coutts at 2026-07-18T08:49:13-04:00 Add interruptIOManager support for select I/O manager Uses the FdWakup mechanism. - - - - - 2f3b00aa by Duncan Coutts at 2026-07-18T08:49:13-04:00 Add interruptIOManager support for poll I/O manager Uses the FdWakup mechanism. A quirk we have to cope with is that we now need to poll one more fd -- the wakeup_fd_r -- but this fd has no corresponding entry in the aiop_table. This is awkward since we have set up our aiop_poll_table to be an auxilliary table with matching indicies. The solution this patch uses (and described in the comments) is to have two tables: struct pollfd *aiop_poll_table, *full_poll_table; and to have the aiop_poll_table alias the tail of the full_poll_table. The head entry in the full_poll_table is the extra fd. So we poll the full_poll_table, while the aiop_poll_table still has matching indicies with the aiop_table. Hurrah for C aliasing rules. - - - - - cee50131 by Duncan Coutts at 2026-07-18T08:49:13-04:00 Add interruptIOManager support for win32 legacy I/O manager And remove unused related helper resetAbandonRequestWait. It is not called because the event is created in auto-reset mode, so never needs to be reset manually. - - - - - cf453143 by Duncan Coutts at 2026-07-18T08:49:13-04:00 Note lack of interruptIOManager support for WinIO I/O manager Though there's a plausible design, we can't sanely test it at the moment due to related WinIO bugs. Filed as issue #27403. - - - - - 1b74a0ad by Duncan Coutts at 2026-07-18T08:49:13-04:00 Be more explicit about enum IOReadOrWrite values, and type within cmm Belt and braces. - - - - - b388d093 by Brian McKenna at 2026-07-18T17:51:50-04:00 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 - - - - - c23e1acb by Mrjtjmn at 2026-07-18T17:52:45-04:00 Add explanations for unsolved Typeable constraints This commit adds explanations for unsolved 'Typeable' constraints. GHC will now provide additional explanations for an unsolved constraint of the form 'Typeable ty', explain why GHC did not solve Typeable constraint. e.g.: - 'ty' is a polymorphic type (e.g. forall a. a -> a) - 'ty' is a qualified type (e.g. Eq Int => Int) - 'ty' is an unboxed sum type - 'ty' is an unreduced type family application - 'ty' whose kind is not typeable Fixes #26532 - - - - - cbef021e by Artem Pelenitsyn at 2026-07-19T07:49:55-04:00 ghc-internal: Lock.hs: fix typo and indentation - - - - - 42918646 by Duncan Coutts at 2026-07-19T07:50:36-04:00 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. - - - - - c2f6dcd4 by Sasha Bogicevic at 2026-07-20T10:31:56+02:00 Improve error messages for invalid record wildcards Record wildcard hints are now shown in more contexts and include constructor arity; matching with `..` on a fieldless constructor now produces a dedicated error message. Fixes #21101 - - - - - 4c02e76b by Duncan Coutts at 2026-07-21T10:37:21-04:00 Mark test T27105 as fragile, citing issue #27522 Scheduler fairness is fine, except when it isn't. And it isn't on CI machines surprisingly often! See the issue for details. - - - - - 43dd2b15 by Recursion Ninja at 2026-07-21T17:09:53-04:00 Resolving many TTG related orphan type-class instances This is part a technical debt removal effort made possible now that separating out the AST via TTG has come to a close. As the AST in 'L.H.S' has been incrementally separated from the GHC internals, there are many accumulated orphan instance of 'Binary', 'NFData', 'Outputable', and 'Uniquable'. The orphan instance of data-types from within 'L.H.S' have had their orphan instances moved to either: 1. The module which defines the data-type 2. The module which defines the type-class; i.e. moving an orphan 'Binary' instance to 'GHC.Utils.Binary' Orphan instances resolved (37): | Data-type | Resolved instance(s) | Former orphan module(s) | | -------------------- | -------------------------- | ------------------------- | | Role | Binary, NFData, Outputable | GHC.Core.Coercion.Axiom | | SrcStrictness | Binary, NFData, Outputable | GHC.Core.DataCon | | SrcUnpackedness | Binary, NFData, Outputable | GHC.Core.DataCon | | Fixity | Binary, Outputable | GHC.Hs.Basic | | FixityDirection | Binary, Outputable | GHC.Hs.Basic | | LexicalFixity | Outputable | GHC.Hs.Basic | | CCallTarget | NFData | GHC.Hs.Decls.Foreign | | CType | NFData | GHC.Hs.Decls.Foreign | | Header | NFData | GHC.Hs.Decls.Foreign | | OverlapMode | Binary, NFData | GHC.Hs.Decls.Overlap | | WithHsDocIdentifiers | NFData, Outputable | GHC.Hs.Doc | | HsDocString | NFData | GHC.Hs.DocString | | HsDocStringChunk | Binary, Outputable | GHC.Hs.DocString | | HsDocStringDecorator | Binary, Outputable | GHC.Hs.DocString | | NamespaceSpecifier | Outputable | GHC.Hs.ImpExp | | ForAllTyFlag | Binary, NFData, Outputable | GHC.Hs.Specificity | | Specificity | Binary, NFData | GHC.Hs.Specificity | | PromotionFlag | Binary, Outputable | GHC.Types.Basic | | FieldLabelString | Outputable, Uniquable | GHC.Types.FieldLabel | | InlinePragma | Binary | GHC.Types.InlinePragma | ------------------------- Metric Decrease: hard_hole_fits ------------------------- Closes #21262, #27469 - - - - - ab9ab895 by Cheng Shao at 2026-07-21T17:10:53-04:00 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. - - - - - 94d8f83b by Cheng Shao at 2026-07-22T11:30:40-04:00 hadrian: clean up stale cabal package flags in the tree This patch cleans up stale cabal package flags in the tree and related hadrian/autoconf logic. Closes #27474. Co-authored-by: Codex <codex(a)openai.com> - - - - - 0bf1d8c9 by Sasha Bogicevic at 2026-07-22T11:31:21-04:00 parser: don't suggest ImportQualifiedPost when it is already enabled -Wprepositive-qualified-module unconditionally attached a hint to enable ImportQualifiedPost, even when the extension was already on (as it is by default under GHC2021). Record the extension's state in the PsWarnImportPreQualified diagnostic and drop the hint when it is already enabled. Fixes #27380 - - - - - 700a1dd1 by Simon Jakobi at 2026-07-23T11:21:20-04:00 ci: Reduce lint job setup costs Avoid fetching unnecessary history and submodules for lightweight lint jobs. Run changelog validation without Hadrian. Because the lint-author job is now based on the .lint template directly, we enhance it to allow Git to read from the runner-owned checkouts, In the previously used .lint-params template, this permissions issue was addressed via `chown`. Closes #27521. Assisted-by: gpt-5.6-sol via Codex CLI - - - - - 26a44fb0 by ARATA Mizuki at 2026-07-23T11:22:10-04:00 testsuite: Fix memory issues of doublex2_* and simd010 doublex2_* had reads from uninitialized memory. simd010 had out-of-bounds array access. Fixes #27544 - - - - - 4d798b17 by Duncan Coutts at 2026-07-23T17:26:18-04:00 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. - - - - - e1cece79 by Duncan Coutts at 2026-07-23T17:26:18-04:00 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. - - - - - 795db115 by Duncan Coutts at 2026-07-23T17:26:18-04:00 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. - - - - - 6f1c8efa by Duncan Coutts at 2026-07-23T17:26:18-04:00 Remove unused tso->block_info.wakeup member Presumably it was used once, but not now. - - - - - 740b88a9 by Duncan Coutts at 2026-07-23T17:26:18-04:00 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. - - - - - 5b92eae2 by Duncan Coutts at 2026-07-23T17:26:18-04:00 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. - - - - - d931715f by Duncan Coutts at 2026-07-23T17:26:18-04:00 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. - - - - - 47e28ebb by Duncan Coutts at 2026-07-23T17:26:18-04:00 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. - - - - - 96e4749d by Duncan Coutts at 2026-07-23T17:26:18-04:00 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. - - - - - 8f62661c by Duncan Coutts at 2026-07-23T17:26:18-04:00 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). - - - - - 42c69ae2 by Duncan Coutts at 2026-07-23T17:26:18-04:00 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. - - - - - 7c64632b by Duncan Coutts at 2026-07-23T17:26:18-04:00 Use BlockInfoForceNonClosure in the select I/O manager - - - - - 8fd7104a by Duncan Coutts at 2026-07-23T17:26:18-04:00 Use BlockInfoForceNonClosure in the win32-legacy I/O manager for the BlockedOn{Read,Write} since these use the non-heap allocated StgAsyncIOResult. - - - - - e0da603b by Duncan Coutts at 2026-07-23T17:26:18-04:00 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. - - - - - 1dd0f381 by Duncan Coutts at 2026-07-23T17:26:18-04:00 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. - - - - - 7a00ffbc by Duncan Coutts at 2026-07-23T17:26:18-04:00 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. - - - - - 522a481f by Duncan Coutts at 2026-07-23T17:26:18-04:00 Remove duplicate assertion - - - - - 0874d965 by Duncan Coutts at 2026-07-23T17:26:18-04:00 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. - - - - - 8f0bdbe1 by Duncan Coutts at 2026-07-23T17:26:19-04:00 Add a changelog entry - - - - - 4fdfe757 by Alan Zimmerman at 2026-07-23T17:27:06-04:00 EPA: Keep decls together in ClassDecl Similar to 1718230f4d3d19d8c49c0e5d496cb0fb6f399528 for HsValBindsLR, this commit updates ClassDecl so that it no longer splits out the assorted `LHsDecl GhcPs` until the renamer. It does this by inserting a type family (separate from the classic TTG one) for this. So data TyClDecl ... | ClassDecl { ... tcdDecls :: XClassDecls pass with type instance XClassDecls GhcPs = [LHsDecl GhcPs] type instance XClassDecls GhcRn = ClassDeclX GhcRn type instance XClassDecls GhcTc = ClassDeclX GhcTc data ClassDeclX pass = ClassDeclX { tcdSigs :: [LSig pass], -- ^ Methods' signatures tcdMeths :: LHsBinds pass, -- ^ Default methods tcdATs :: [LFamilyDecl pass], -- ^ Associated types; tcdATDefs :: [LTyFamDefltDecl pass], -- ^ Associated type defaults tcdDocs :: [LDocDecl pass] -- ^ Haddock docs } - - - - - f586c885 by Simon Jakobi at 2026-07-24T18:05:00-04:00 ci: Use shallow submodule clones by default Limit submodule clones to depth one to reduce CI checkout costs. Keep fetching full submodule history for the submodule lint jobs, which inspect commits across a range. Assisted-by: gpt-5.6-sol via Codex CLI - - - - - 306120d2 by Duncan Coutts at 2026-07-24T18:05:43-04:00 Fix flaky test T3994 on FreeBSD On current FreeBSD versions, calling getpgid on a zombie process fails. In T3994, if we're really unlucky with delays and scheduling then we can end up in exactly that situation. Just catch that specific exception and ignore it. It's rare, and not our fault. - - - - - 7b116a0b by Cheng Shao at 2026-07-24T18:06:24-04:00 ci: add missing workaround for docker permissions in lint jobs Some lint jobs use ci-images with default user `ghc`, and the gitlab ci docker executor requires the `sudo chown` workaround to fix workspace directory permission issue. This patch adds the missing workarounds for the lint jobs. Fixes #27554. Co-authored-by: Codex <codex(a)openai.com> - - - - - 815149f3 by Andrzej Rybczak at 2026-07-25T15:06:43+00:00 Add -Wdefaulted-callstack Adds a new warning, -Wdefaulted-callstack, which warns when an implicit CallStack parameter is defaulted to the empty stack. In particular, this includes call sites where a function with a HasCallStack constraint is called from a definition that does *not* provide one. At such call sites the call stack is cut off and does not include the enclosing definition's callers, which can be a source of surprise if the user wants complete call stacks. Closes #27077. - - - - - f6f2343f by Zubin Duggal at 2026-07-25T17:40:51-04:00 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 - - - - - 5d0ab71a by fendor at 2026-07-27T17:31:05-04:00 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 - - - - - 6cce494a by fendor at 2026-07-27T17:31:05-04:00 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. - - - - - f8e3bee9 by Zubin Duggal at 2026-07-27T17:31:49-04:00 testsuite: skip runtime stats tests on debugged compilers Debugged flavours build the boot libraries without optimisation, so the runtime numbers do not match the baselines. - - - - - 1e326770 by Zubin Duggal at 2026-07-27T17:31:50-04:00 testsuite: mark #20706 tests fragile rather than broken Whether the static linux linker issues manifest depends on the host toolchain. - - - - - c0b13cbe by Zubin Duggal at 2026-07-27T17:31:50-04:00 testsuite: exclude libnuma from mostly-static It needs static system libraries (libnuma.a) that many platforms do not ship. Fixes #26914 - - - - - bee1913d by Alan Zimmerman at 2026-07-28T16:42:29-04:00 EPA: ClsInstDecl with decls as [LHsDecl GhcPs] in GhcPs Similar to 4fdfe75731e01dad7d7fa474c2703d0d3965afb1, this commit changes the as-parsed representation of class instance declarations to [LHsDecl GhcPs], and only separates them by type from the renamer onward. This also allows us to remove all the AnnSortKey machinery for exact printing, as it is now no longer needed. - - - - - 72c55eee by Cheng Shao at 2026-07-28T16:43:11-04:00 hadrian: implement and use writeFileAtomic to fix race condition This patch implements `writeFileAtomic` in hadrian and change all invocations of shake non-atomic `writeFile'` to use `writeFileAtomic`, to avoid multiple hadrian concurrent invocations overwriting the same in-tree generated file not in the build root directory. Fixes #27536. Additional notes: - `writeFileChanged`/`writeFileChangedBS` cannot be made atomic since it involves reading the file's older version, so their uses are left alone. It doesn't affect #27536 given their outputs are contained in the build root directory. - It's possible to shrink this patch by only making writes outside the build root directory atomic. But I think it's not worth the effort for fine grained distinction here, and atomic writes within the build root directory should also improve robustness of a hadrian build. - In the longer term we do want to make a ghc build only generate files within the build root directory, though that's a lot of work and outside the scope of this particular bugfix. Co-authored-by: Codex <codex(a)openai.com> - - - - - 46d4f963 by Sylvain Henry at 2026-07-29T06:38:40-04:00 RTS: correctly mark slop bytes when shrinking large arrays (#19048) Correctly mark slop bytes even when profiling is off so that heap census doesn't traverse garbage-collected closures. - - - - - 4762a8bf by Simon Jakobi at 2026-07-29T06:39:23-04:00 Add -XLazyFieldAnnotations (GHC proposal 752) Unbundle the prefix `~` lazy field annotation syntax from StrictData. The new LazyFieldAnnotations extension controls whether `~` is accepted on constructor fields. StrictData (and Strict, transitively) imply the new extension. See https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0752-l…. Closes #24455. Assisted-by: Claude Opus 4.8 - - - - - 0b6dcc84 by Simon Jakobi at 2026-07-29T06:40:04-04:00 testsuite: Relax T24471 residency tolerance T24471 peak residency fluctuates enough on i386 to cause spurious failures. Use the standard residency tolerance while retaining the existing allocation threshold. See https://gitlab.haskell.org/ghc/ghc/-/work_items/24471#note_682303. Assisted-by: gpt-5.6-sol via Codex CLI - - - - - 90e95b34 by Cheng Shao at 2026-07-29T06:40:45-04:00 compiler: fix missing top-level procedure labels in cmm dumps This patch fixes missing top-level procedure labels in some intermediate Cmm pass dumps. Fixes #27553. Co-authored-by: Codex <codex(a)openai.com> - - - - - 360a5946 by sheaf at 2026-07-29T06:41:35-04:00 Add some type-family-heavy performance tests FamAppCachePerf stress-tests the performance of lookups in the type family application cache. T27336 is a minimisation extracted from the reported reproducer. SimplCastPerf is a measure of coercion growth due to the simplifier calling mkTransCo without re-optimising the result. - - - - - 3ec9e2b9 by Mike Pilgrem at 2026-07-31T08:21:33-04:00 GHC Guide: Improve docs on response files - - - - - e5b2a1f7 by sheaf at 2026-07-31T08:22:23-04:00 Disable Core Lint for TcPlugin_RewritePerf This is a compiler performance test, but the test source hard-coded -dcore-lint, defeating the measurement. ------------------------- Metric Decrease: TcPlugin_RewritePerf ------------------------- - - - - - 85b10c00 by Alan Zimmerman at 2026-07-31T22:09:47+01:00 EPA: Remove LocatedP from OverlapMode We have type LocatedP = GenLocated SrcSpanAnnP type SrcSpanAnnP = EpAnn AnnPragma As the first step in removing this in favour of LocatedA which only captures location, comments and trailing annotations, we remove it from OverlapMode We do this by moving the AnnPragma into the TTG extension point instead. - - - - - c9a34a00 by Viktor Dukhovni at 2026-08-02T04:34:17-04:00 Fix note typo - - - - - 4f2a21f7 by Andreas Klebinger at 2026-08-02T22:46:46-04:00 Apply oneShot Monad trick to STG LintM - - - - - 21e4b89d by Andreas Klebinger at 2026-08-02T22:46:46-04:00 stgLint: Use a single reader env for read only arguments. - - - - - d415f38a by Alan Zimmerman at 2026-08-02T22:47:27-04:00 EPA: Remove LocatedP from CType The next step of removing use of LocatedP by moving the AnnPragma for CType into its TTG extension point instead. - - - - - 8fc6f882 by Simon Jakobi at 2026-08-05T14:53:41-04:00 testsuite: Don't crash on non-UTF-8 test output read_stdout, read_stderr_for, read_comp_stderr and read_diff decoded strictly (the first three with UTF-8, read_diff with the locale encoding), so a test emitting invalid UTF-8 (binary output, or a crash truncating a multi-byte character) raised UnicodeDecodeError and was reported as a framework failure instead of its actual result. Decode with errors='replace', like read_no_crs and safe_print. Assisted-by: Claude Fable 5 - - - - - 56534866 by Simon Jakobi at 2026-08-05T14:53:41-04:00 testsuite: Colorize the test summary, also in CI The summary headings were plain, and SUMMARY was colored unconditionally, so the escapes also ended up in the file written by --summary-file. Color is now decided per output sink via term_color.colored_if; see the comments in term_color. CI logs are not a tty, but GitLab's log viewer renders ANSI colors, so add --force-colors and pass it in .gitlab/ci.sh. Assisted-by: Claude Opus 5 - - - - - bceb541a by Simon Jakobi at 2026-08-05T14:53:42-04:00 testsuite: Repeat unexpected failure output in the summary Finding out why a test failed meant scrolling back through a possibly very long log to the point where the test ran. The summary now repeats the captured output of unexpected failures, before the statistics, so the most interesting part is at the end of the log (#16720). Output mismatches report their diff instead of the mismatching stream (see Note [Redundant output in test results]). The repeated output is bounded per stream, and skipped altogether beyond MAX_SUMMARY_OUTPUT_TESTS failure blocks. Tests failing identically in several ways share one block. Test results now report a source-relative directory, stable regardless of where the run was started from. Assisted-by: Claude Fable 5 - - - - - 2ab02c57 by Ben Gamari at 2026-08-05T14:54:24-04:00 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 - - - - - 126ce574 by Vladislav Zavialov at 2026-08-05T14:55:05-04:00 Test case for #20902 Starting with GHC 9.14.1 (the first major release to include 51e3ec83), and from point releases GHC 9.10.2 and GHC 9.12.3 (backports cc4470be68 and b30f25591e), all examples in this ticket are handled as expected. - - - - - b14d8d59 by Alan Zimmerman at 2026-08-05T14:55:46-04:00 EPA: Remove LocatedP, last use in WarningTxt The last step of removing LocatedP, by moving the AnnPragma for WarningTxt into its TTG extension point instead. This also allows us to remove LocatedP and SrcSpanAnnP - - - - - 70b58c8f by Vladislav Zavialov at 2026-08-05T14:56:27-04:00 Test cases for #18725 Starting with GHC 9.4 (the first release to include 268efcc9a4), the program in this ticket no longer panics. A standalone kind signature breaks the recursive loop, so the type constructor can be used in a kind within its own group. T18725a checks that this is accepted with the signature present, while T18725b confirms it is still rejected without it. - - - - - b18c8dd5 by Zubin Duggal at 2026-08-06T15:51:01-04:00 hie files: Dump the type table when dumping with -ddump-hie - - - - - f839d0fb by Zubin Duggal at 2026-08-06T15:51:01-04:00 hie files: Take evidence for quantified constraints into account when saving evidence terms to the hie ast Fixes #25709 - - - - - 5753ebaa by Simon Jakobi at 2026-08-06T15:51:43-04:00 testsuite: fix stale paths for the ghc-config build artifacts ghc-config.hs moved from testsuite/mk/ to testsuite/ghc-config/ in 6c7a49139c, but the .gitignore entry and the clean rule still referred to the old location. As a result the compiled ghc-config binary, which boilerplate.mk rebuilds on every make-driven test run, showed up as an untracked file and was never cleaned. Assisted-by: Claude Opus 5 - - - - - 246d4d72 by Simon Peyton Jones at 2026-08-06T15:52:25-04:00 Documentation only ...driven by my investigation of #27591 - - - - - be69e9df by Alan Zimmerman at 2026-08-06T15:53:05-04:00 EPA: Replace AnnPragma with individual types We introduced AnnPragma as a common type for all pragma usages wrapped in LocatedP / SrcSpanAnnP. Now that those are gone, and the AnnPragma moved into the TTG points for the given items, we can ensure that each carries only the annotations it needs. So we remove AnnPragma, and in its place bring in AnnCType AnnWarningTxt AnnOverlap AnnAnnDecl AnnPragSCC - - - - - 0779e12c by Simon Jakobi at 2026-08-07T12:36:11-04:00 Cmm: print unreachable blocks under -dppr-debug (#27368) Unreachable blocks linger in a CmmGraph's block map for most of the Cmm pipeline, but pprCmmGraph only ever printed the blocks reachable from the entry, so dumps looked consistent while the graph was not. Issues like #27368 were hard to debug due to this. pprCmmGraph now appends the stored-but-unreachable blocks under a "// unreachable blocks:" heading when -dppr-debug is on. See Note [unreachable blocks] in GHC.Cmm.Pipeline. Assisted-by: Claude Opus 5 - - - - - 3a0f9a51 by Simon Peyton Jones at 2026-08-07T12:36:54-04:00 Fix three bugs related to required type args and INLINE pragmas * `GHC.Core.Opt.Arity.mkEtaForAllMCo` got the visibility flags back to front, leading to a Lint error (#27557) * The arity in an InlineSaturation is the VisArity not the Arity; the two can differ when we have "required" type arguments. This made the INLINE pragma argument counting go wrong in `makeCorePair` (#27590). * When a simple binding has a type signature, we take special path in `tcPolyCheck`, leading to an outer `AbsBinds` that has no dictionaries, even when the binding is in fact overloaded. That confused the inline-arity computation in `makeCorePair` (#27589). The latter two are fixed using the new function `GHC.HsToCore.Binds.findSatArity`. That actually simplifies the API of `makeCorePair`, which is nice. The first bug is fixed by swapping the visiblity flags in `GHC.Core.Opt.Arity.mkEtaForAllMCo` Getting the INLINE behaviour right led to some perf changes: * Runtime /halved/ on T7954 due to better specialisation * Compile time increased by 6% in T21839c because a bit more inlining happened, as it always should have done. * For some reason compile-time max-bytes-used dropped by 30% on T27336, but only on one build configuration; and it increased on LinkableUsage02 by 6% on another configuration Geometric mean effect on our compile time benchmarks is +0.1%. Metric Decrease: T27336 T7954 Metric Increase: LinkableUsage02 T21839c - - - - - 4f985108 by Vladislav Zavialov at 2026-08-07T17:49:50-04:00 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 - - - - - eb1dcd4d by sheaf at 2026-08-07T17:50:40-04:00 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 - - - - - 3a552476 by Simon Jakobi at 2026-08-09T15:20:06-04:00 Word64Map: add compareSize compareSize m c compares the size of a map to an Int, but unlike compare (size m) c it stops traversing the map once the outcome is determined. Based on https://github.com/haskell/containers/pull/1139 Assisted-by: Claude Opus 5 - - - - - 6e2c99d8 by Simon Jakobi at 2026-08-09T15:20:06-04:00 Use a pigeonhole sort for deterministic UniqDFM iteration Deterministic UniqDFM iteration used a list mergesort, allocating O(n log n) cons cells and contributing significantly to compiler allocations (#27459). Use a pigeonhole sort where appropriate, while retaining the mergesort fallback. See Note [Sorting a UDFM] and Note [Cost of deterministic iteration]. The peak_megabytes_allocated increase for LinkableUsage02 is probably due to GC timing noise. See #27613. ------------------------- Metric Decrease: InstanceMatching InstanceMatching1 ManyAlternatives T12707 T13379 T13719 T24471 T27336 T5321FD T5321Fun T783 Metric Increase 'peak_megabytes_allocated': LinkableUsage02 ------------------------- Assisted-by: gpt-5.6-sol via Codex CLI - - - - - a938ab12 by sheaf at 2026-08-09T15:20:48-04:00 Testsuite: don't measure max residency for T27336 We really care more about total allocations for this test, so this commit removes the maximum residency measurement. - - - - - 7d94bb78 by Alan Zimmerman at 2026-08-09T15:21:29-04:00 EPA: Remove LocatedE, replace with LocatedA This gets rid of one more LocatedXXX occurrence - - - - - 9df24b7e by sheaf at 2026-08-10T14:28:30-04:00 hie.yaml: use a polyglot shell/batch script This commit merges hie-bios and hie-bios.bat into a single polyglot script. This avoids Windows users having to manually update hie.yaml in order to be able to use HLS. - - - - - 7f75c588 by Alan Zimmerman at 2026-08-10T14:29:11-04:00 EPA: Remove type parameter from AnnList This is a step towards cutting AnnList down to its core for formatting lists only - - - - - e8d1a0d6 by Bernhard M. Wiedemann at 2026-08-10T21:31:23-04:00 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(a)suse.de> - - - - - 556db2f3 by sheaf at 2026-08-10T21:32:06-04:00 Reduce SpecConstr threshold in GHC.Tc.Solver.Rewrite As remarked in #27628, this module currently sits on a knife's edge: if the body of 'simplifyArgsWorker' is made even a tiny bit smaller, then SpecConstr suddenly kicks in and causes disastrous reboxing of the LiftingContext argument. To make this less likely to happen, this commit lowers the SpecConstr threshold. - - - - - c77d88fc by sheaf at 2026-08-13T10:15:22-04:00 Allow rewriting in RuntimeReps for newtype ConPats This commit implements PHASE 2 of the FixedRuntimeRep plan described in Note [The Concrete mechanism] in GHC.Tc.Utils.Concrete for newtype constructor patterns. In short, GHC now accepts programs of the form f (MkN x) = ... in which the argument 'x' of the newtype constructor pattern 'MkN x' has a representation that is not syntactically concrete, e.g. it can be 'Id IntRep' reducing to 'IntRep'. See T20363{,b,c} for examples. There are two main parts to the implementation: 1. Typechecking, in GHC.Tc.Gen.Pat.tcDataConPat. See Note [Typechecking newtype constructor patterns] in GHC.Tc.Gen.Pat. 2. Desugaring. We restructure the code for desugaring pattern matches by allowing the scrutinised match variable to be casted. This allows us to accumulate coercions and avoids creating binders at intermediate types tha don't have a fixed RuntimeRep. See the revamped Note [Match Ids] in GHC.HsToCore.Monad. Fixes #20363 ------------------------- Metric Increase: InstanceMatching ------------------------- - - - - - 6ba9dd41 by Wolfgang Jeltsch at 2026-08-13T10:16:07-04:00 Improve the documentation of `--show-iface` This change in particular gets rid of the claim that `--show-iface` writes *the* contents of the interface file in question. It doesn’t do that; it only writes those parts that are likely of interest to a human reader. - - - - - 4bd193fa by Sylvain Henry at 2026-08-13T10:17:00-04:00 RTS: fix LDV profiler's slop skipping (#27585) processHeapForDead was the one heap scanner not updated for the slop marker encoding introduced in #19048. It still assumed slop is zeroed: while (p < bd->free && !*p) p++; // skip slop so it stopped at the (StgWord)(-1) sentinel and passed it to processHeapClosureForDead. IS_FORWARDING_PTR(-1) holds, hence a garbage size was read out of LDVW and the scan ran off the block, tripping ASSERT(p == bd->free) on a debug RTS and silently corrupting the census otherwise. The loop was hand-copied in four places, so factor it out into skipSlop in ClosureMacros.h and use it in ProfHeap.c, Sanity.c, Printer.c and LdvProfile.c. Co-Authored-By: Claude Opus 5 (1M context) <noreply(a)anthropic.com> - - - - - 1446bb03 by Zubin Duggal at 2026-08-13T10:17:48-04:00 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 - - - - - 257c3ed7 by Simon Jakobi at 2026-08-13T10:18:29-04:00 Testsuite: widen InstanceMatching acceptance window to 5% (#27673) ...in order to unblock CI. Assisted-by: Claude Fable 5 - - - - - e4cfaaa0 by Simon Peyton Jones at 2026-08-14T01:09:32+02:00 Major patch to re-engineer known-key names This big patch implements the New Plan for known-key names, described in #27013. Read the big Note [Overview of known-key names] in GHC.Types.Name Some things had to be reworked slightly to accomodate the new known-keys design. A significant one was the generation of auxiliary KindRep bindings, which was greatly simplified. Note [Grand plan for Typeable] was updated accordingly. Another example: GHC.Internal.CString was merged into GHC.Internal.Types. Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita(a)gmail.com> The couple hundreds of hours spent here by Rodrigo were sponsored by Well-Typed Metrics: compile_time/bytes allocated ------------------------------------- Baseline Test Metric value New value Change ------------------------------------------------------------------------------------------ MultiComponentModules100(normal) ghc/alloc 24,312,779,672 24,990,470,432 +2.8% BAD MultiComponentModulesRecomp(normal) ghc/alloc 601,924,960 621,884,888 +3.3% BAD MultiComponentModulesRecomp100(normal) ghc/alloc 11,884,065,432 12,531,373,704 +5.4% BAD MultiLayerModules(normal) ghc/alloc 3,861,537,072 3,706,919,512 -4.0% GOOD T13701(normal) ghc/alloc 3,517,246,392 3,237,179,616 -8.0% GOOD T13820(normal) ghc/alloc 28,961,056 29,663,208 +2.4% BAD T14697(normal) ghc/alloc 472,044,184 443,550,048 -6.0% GOOD T18140(normal) ghc/alloc 47,905,664 49,115,808 +2.5% BAD T4801(normal) ghc/alloc 269,339,096 263,432,040 -2.2% GOOD T783(normal) ghc/alloc 341,112,672 333,339,952 -2.3% GOOD hard_hole_fits(normal) ghc/alloc 222,164,728 213,433,808 -3.9% GOOD mhu-perf(normal) ghc/alloc 49,011,440 46,706,280 -4.7% GOOD geo. mean +0.1% minimum -8.0% maximum +5.4% All performance regressions were investigated in depth. The surviving ones: - MultiComponentModules100, MultiComponentModulesRecomp100, MultiComponentModulesRecomp regresses because existing bugs that make an additional implicit edge do too much redundant work: #27053 and #27461 - T13820, T18140, T10547, T13035 regress because we load an additional interface and associated Names for GHC.Essentials. ------------------------- Metric Decrease: MultiLayerModules T13379 T13701 T14697 T26989 T4801 T783 T9961 hard_hole_fits mhu-perf size_hello_artifact size_hello_obj size_hello_unicode Metric Increase: LinkableUsage01 LinkableUsage02 MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 T10547 T13035 T13820 T18140 T18698a T18698b T20049 ------------------------- Bumps submodule binary Closes #27013 - - - - - 61665e79 by sheaf at 2026-08-14T01:09:33+02:00 Allow GHC.Essentials to be hidden This commit overhauls several aspects of the known entity handling, in order to allow GHC.Essentials to be hidden without a proliferation of special cases in the compiler. The main contribution is to introduce the 'UnresolvedImport' datatype which cleans up a lot of ad-hoc handling relating to 'ModSummary', fixing #27603. This allows us to reduce duplication, e.g. by having Backpack reuse 'mkUnresolvedImports' instead of replicating the "add implicit imports" logic. It also makes it easier to avoid undesirable edge cases (such as making sure that the Template Haskell 'reifyModule' function does not leak the implicit GHC.Essentials import). In particular, the infamous 'findImportedModuleWithIsBoot' is now simply 'resolveImport', taking a single 'UnresolvedImport' and resolving it to a 'FindResult' (usually a 'Module'). Other changes: - Cache the result of looking up GHC.Essentials (in TcM and DsM environments) to avoid redundant work. This reduces allocations on LinkableUsage01 and hard_hole_fits. - Properly look up known entities for StaticPointers like we do for other known entities everywhere else. This allows e.g. modules in ghc-internal to use -XStaticPointers. - When using multiple home units, we are now careful to handle the situation in which we may have multiple GHC.Essentials modules around. See the new tests under 'driver/multipleHomeUnits'. - - - - - b19fcc1c by Vladislav Zavialov at 2026-08-14T06:26:11-04:00 Increase test coverage of diagnostics, batch 2 Add test cases for the previously untested diagnostics: [GHC-26133] TcRnForeignImportPrimSafeAnn [GHC-68444] SumAltArityExceeded [GHC-63966] IllegalSumAlt [GHC-23882] IllegalDeclaration [GHC-60220] InvalidCCallImpent [GHC-18816] RecGadtNoCons [GHC-38140] GadtNoCons [GHC-37056] InvalidTypeInstanceHeader [GHC-78486] InvalidTyFamInstLHS [GHC-39639] DefaultDataInstDecl [GHC-78822] AssocDefaultNotAssoc [GHC-43510] NotSimpleUnliftedType [GHC-41843] IOResultExpected [GHC-07641] AtLeastOneArgExpected [GHC-52886] InvalidTopDecl Remove unused error constructors: [GHC-92057] ImportLookupAmbiguous - - - - - 7b27f25a by Simon Jakobi at 2026-08-14T06:26:54-04:00 testsuite: Drop peak_megabytes_allocated from LinkableUsage tests LinkableUsage01/02 collected all metrics with a 2% tolerance. For peak_megabytes_allocated, whose granularity is 1 MB, that window is under 0.7 MB at this test's ~34 MB peak, so any 1 MB step failed the test (#27613, #27489). Drop that metric: max_bytes_used guards the Linkable-retention property with byte granularity, at a tolerance that still comfortably exceeds the noise observed in CI. Assisted-by: Claude Fable 5 - - - - - e5de423b by Simon Jakobi at 2026-08-14T06:26:54-04:00 testsuite: Don't truncate fractional baselines when computing bounds RelativeMetricAcceptanceWindow.get_bounds truncated the baseline with int() before applying the tolerance. Baselines can be fractional (they are averaged over several measurements), so this skewed the acceptance window downwards: in #27613, a baseline of 33.67 at 2% tolerance yielded bounds (32, 34) instead of (32, 35), rejecting a measurement that was within tolerance. Assisted-by: Claude Fable 5 - - - - - db959f83 by Simon Jakobi at 2026-08-14T15:16:44-04:00 testsuite: Expect length001 failure in nonmoving_thr_sanity length001 relies on an optimization rule to avoid excessive stack use. The nonmoving_thr_sanity way does not enable optimization, so classify its stack overflow as an expected failure, as is already done for the other unoptimized nonmoving ways. Assisted-by: gpt-5.6-sol via Codex CLI - - - - - 4f2b7d90 by Simon Jakobi at 2026-08-14T15:16:44-04:00 testsuite: Omit T22859 in nonmoving threaded ways T22859 checks allocation-limit handlers with output that depends on precise allocation behaviour. The nonmoving threaded ways change where these limits are reached, just as the already-omitted LLVM ways do. Omit these ways instead of treating their incidental output differences as test failures. Assisted-by: gpt-5.6-sol via Codex CLI - - - - - c4abddcb by Simon Jakobi at 2026-08-14T15:16:44-04:00 rts/js: Implement eq_thread, and test Eq/Ord ThreadId (#16761) Since d1f3c63701, Eq ThreadId is implemented via the RTS function eq_thread, but the JS RTS never provided it, so comparing ThreadIds for equality on the JS backend crashed with ReferenceError: h$eq_thread is not defined Like the C implementation, h$eq_thread uses pointer equality: The JS RTS has exactly one thread object per thread. Since previously no test exercised eq_thread directly, this commit adds a test covering equality, its stability across GC, and agreement with Ord. Assisted-by: Claude Fable 5 - - - - - 4a7defa1 by Simon Jakobi at 2026-08-14T15:16:44-04:00 testsuite: Make listThreads1 insensitive to the RTS's own threads listThreads1 expected `listThreads` to return exactly [ThreadId 1]. That holds only under a non-threaded RTS. Under a threaded RTS however there are more threads present, so we change the test to simply check that `myThreadId` is present in the list. Assisted-by: Claude Opus 5 - - - - - b757727a by Vladislav Zavialov at 2026-08-14T15:17:27-04:00 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 - - - - - c130188d by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 loopImports: Don't dup ms_uid in summary imports We were writing the ms_unitid of the mod summary with every single import of that module That complicated the code (as though the UnitId in that list could ever be something else) and also allocates unnecessarily per every mod import. Very slight allocation decrease measured locally in a few tests: (MultiComponentModulesRecomp: -0.06%; MultiComponentModulesRecomp100: -0.05%) Purely a clean up. - - - - - c71166a8 by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 downsweep: make control flow simpler and cache correct This refactor extracts the control flow of downsweep into a single function `dfsBuild`, which takes care of iteratively expanding and traversing all nodes of the in-construction module graph necessary to build a full `ModuleGraph`. There are three levels of caching going on, all of which are necessary to make sure we don't do repeated work (notably, NEVER summarise the same module twice). 1. `dfsBuild` accumulates the final module graph and never revisits the same node of the module graph. Cache is keyed by the final `ModuleGraph`s `NodeKey`s. 2. For Module A in home-unit u1, each import in the list of imports needs to be *found* (call to `findImportedModuleWithIsBoot`): at this point, we only have the `ModuleName` of the import, not the `Module`. This *finding* is somewhat expensive, so we cache it as well (`ImportsCache`). The cache key is the home-unit to which the module belongs~[1], the import package qualifier, and the ModuleName. [1] Different home-units will have different package flags, which means potentially different `Module` resolution for the same `ModuleName`. 3. The most expensive operation we want to avoid is summarising a `Module` into a `ModSummary`, which notably involves parsing the module header from scratch. The third cache, in essence, maps a `Module` to its `ModSummary` (named `ModSummaryCache`). This cache upholds the invariant: we NEVER summarise the same module twice. In practice, the cache key is the Module's UnitId and the Source path; the reason is we need to distinguish between `.hs` and `.hs-boot` files, as their summaries will differ. Note that (2) can't guarantee this alone: Two ModuleName imports in separate units can (and likely do) map to the same `Module`. Note that the previous implementation failed to achieve the no-duplicate-work summarisation invariant, and we ended up doing a quadratic amount of processing in scenarios like test `MultiComponentModules100`. See also Note [Downsweep Control Flow and Caching] Fixes #27461 Perf changes: MultiComponentModules(normal) ghc/alloc 2,097,389,264 1,992,186,736 -5.0% GOOD MultiComponentModules100(normal) ghc/alloc 24,310,173,770 21,293,867,360 -12.4% GOOD MultiComponentModulesRecomp(normal) ghc/alloc 602,761,394 498,543,984 -17.3% GOOD MultiComponentModulesRecomp100(normal) ghc/alloc 11,885,968,240 8,895,404,864 -25.2% GOOD ------------------------- Metric Decrease: MultiComponentModules MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 ------------------------- - - - - - ebc4047b by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 implicitRequirementsShallow can never reach HoleUnit findImportedModule will never return `HoleUnit` for a `ModuleName` (a `HoleUnit` can only be found as a signature instantiation, never as a directly *imported* thing) Therefore, we can drop `[ModuleName]` returned by `implicitRequirementsShallow`, which makes many things dead code. Namely, the call to `implicitRequirementsShallow` from GHC.Driver.Downsweep which was a performance bottleneck (for doing lots of duplicate work in findImportedModule) is now entirely gone. Fixes #27053 In an MR with this patch and the downsweep refactor (previous commit), CI says: MultiComponentModules(normal) ghc/alloc 2,097,396,728 1,943,662,304 -7.3% GOOD MultiComponentModules100(normal) ghc/alloc 24,310,182,136 17,227,574,440 -29.1% GOOD MultiComponentModulesRecomp(normal) ghc/alloc 602,769,518 449,973,656 -25.3% GOOD MultiComponentModulesRecomp100(normal) ghc/alloc 11,885,976,408 4,828,894,160 -59.4% GOOD ------------------------- Metric Decrease: MultiComponentModules MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 ------------------------- - - - - - 85a6ab01 by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 downsweep: Cache negative results When traversing a module graph structure, a uniquely identified node should always expand to the same thing. I don't see how visiting the same node which failed to be expanded a first time would ever successfully expand the second time we try to expand it (eg. when coming from a different edge to it -- it is still the same node!). The node expansion is local, based just based on the node itself, not on the path to get there. Therefore, this patch removes the weird behavior and commentary of `dfsBuild` wrt to `Nothing` not being cached and being potentially expanded a second time around to something different, which was misleading and, ultimately, incorrect. Now, we have a `MGRes`, which is more explicit about a node being Skipped just being a node that is ignored whenever it is found (and that skip is cached) -- and we may want to do this due to failures or due to just trying nodes which might not work on purpose, like hs-boots. We uniformly cache positive and negative results and remove the assumption that there might be an ordering in which the same node visited at a later time might be expanded differently. This makes it possible to traverse the module nodes in parallel without a change in behavior, since there's no longer a hidden ordering requirement. - - - - - 56747c3f by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 Organize and clean-up GHC.Driver.Downsweep Simply some cosmetic changes, moving definitions around to structure the module better into its relevant sections (In go (ns ++ ss), it's not a problem to use ++ because it's a good producer and we won't have to append fully before processing the next item in go) - - - - - 12f64118 by Wolfgang Jeltsch at 2026-08-15T06:31:12-04:00 Add support for textual output of bytecode file content - - - - - a737df91 by Brandon Chinn at 2026-08-15T12:40:25-04:00 Add law in qualified strings doc - - - - - e3188581 by Zubin Duggal at 2026-08-15T12:41:06-04:00 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 - - - - - ca9b0b22 by mangoiv at 2026-08-15T12:41:47-04:00 hadrian: set the executable bit for hie-bios.bat - - - - - 1aac7095 by sheaf at 2026-08-16T04:37:16-04:00 Avoid wasteful allocations in mkTyConAppCo The idiom "traverse isReflCo_maybe" followed by "map fst" used in 'GHC.Core.Coercion.mkTyConAppCo' was allocating a lot of waste. This commit uses 'GHC.Data.Unboxed.traverseMaybeUB' to avoid all these unnecessary intermediate allocations. In a quick microbenchmark for 'mkTyConAppCo', this change resulted in: - refl case (all argument coercions are reflexive): - -60% runtime - -80% allocations - non-refl case: - from 0% to -12% runtime (depending on which argument is non-refl) - from 0% to -70% allocations ( -- '' -- ) Fixes #27648 ------------------------- Metric Decrease: FamAppCachePerf SimplCastPerf T12425 T15703 T26426 T3064 T9872a T9872b T9872b_defer T9872c T9872d T5321Fun T9020 T9630 TcPlugin_RewritePerf Metric Increase: LinkableUsage02 ------------------------- - - - - - 3915e982 by Alan Zimmerman at 2026-08-16T04:37:58-04:00 EPA: Remove al_trailing from AnnList It was not being used - - - - - fed942ac by Andreas Klebinger at 2026-08-17T12:11:57-04:00 testsuite: Use sigkill in process009. SIGHUB might have been blocked by a (grand)*parent of the test. In such cases the test would fail as the python process would simply exist gracefully instead of committing to a premature end. By using SIGKILL we can rely on the signal not being blocked, fixing #27578 in the process. - - - - - 574c875f by Andreas Klebinger at 2026-08-17T12:12:39-04:00 Simplify comparison in DFM.hs Fixes #27669 - - - - - d8f1a2a3 by Alan Zimmerman at 2026-08-17T12:13:18-04:00 TTG: Add extension points to BooleanFormula They are currently unused, but will be used for exact print annotations next, allowing us to get rid of LocatedBF / SrcSpanAnnBF - - - - - 93a2b20f by Andreas Klebinger at 2026-08-18T04:31:04-04:00 Fix a number of incorrect module references: Fix module reference in Note [DataCon wrappers are conlike]. Fix module reference in Note [Detailed InertCans Invariants]. Fix module reference in Note [GHC's data format representations]. Fix module reference in Note [Grand plan for static forms]. Fix module reference in Note [How tuples work]. Fix module reference in Note [Solved dictionaries]. Fix module reference in Note [Stacktraces from Info Table Provenance Entries (IPE based stack unwinding)]. Fix module reference in Note [The VarBndr type and its uses]. Found the incorrect references with a llm. - - - - - eb0dfb01 by Simon Jakobi at 2026-08-18T04:31:44-04:00 ci: Run stack-hadrian-build only in full-ci pipelines The job exists to catch changes that break hadrian/build-stack (#18726), but nothing in the pipeline depends on it, and it can only break when hadrian's dependencies change. Restricting it to full-ci (like hadrian-multi) still covers marge-bot merge batches, so such breakage cannot reach master unnoticed, while ordinary validate pipelines skip the job. Assisted-by: Claude Fable 5 - - - - - b9160962 by Simon Jakobi at 2026-08-20T14:57:52-04:00 testsuite: Show baseline sample count and range in perf failures A perf baseline is the mean of all samples recorded for a commit, and it prints as a single number, hiding how far the samples spread. When the spread is wide, this can indicate an unstable metric that isn't actually useful as a signal for the perf tests. For example, in #27602, T27336's peak_megabytes_allocated baseline showed as 757 when the underlying samples were 605 and 909. When the baseline is averaged from more than one sample, say so in the failure output: the one-line stat-failure reason shows the sample range, and the detail block lists the raw samples. Single-sample baselines print exactly as before. Context: #27602 Assisted-by: Claude Fable 5 - - - - - a4979877 by Simon Jakobi at 2026-08-20T14:57:52-04:00 testsuite: Fold Baseline into CommitMetric A Baseline was just a CommitMetric plus the commit it came from, built by copying fields across. Since get_commit_metric already knows that commit, record it on CommitMetric itself and drop Baseline. This also collapses both branches of find_baseline into plain returns. Assisted-by: Claude Fable 5 - - - - - 99fb8d68 by Simon Jakobi at 2026-08-20T14:57:52-04:00 ci: Clarify comment on pushing perf notes after failures Context: #27602 Assisted-by: Claude Fable 5 - - - - - 2ca87972 by Alan Zimmerman at 2026-08-20T14:58:36-04:00 EPA: Remove LocatedBC / SrcSpanBF The custom annotations are now in the BooleanFormula TTG extension points, so LBooleanFormula can now use the standard LocatedA. - - - - - d2bc32aa by Simon Peyton Jones at 2026-08-21T12:59:26-04:00 Better handling of serialisation of wired-in names Fixes #27501 - - - - - d2795ffc by Alan Zimmerman at 2026-08-21T13:00:05-04:00 EPA: Remove NoEpTok/NoEpUniTok, using an unhelpful SrcSpan instead Also introduce helper functions noEpTok and noEpUniTok to serve as simple replacements in code inserting an token annotation without location information. - - - - - b5d29ab8 by Brandon Chinn at 2026-08-25T18:42:08-04:00 Add Data.RealFloat and Infinity/NegInfinity/NaN pattern synonyms (#26961) - - - - - e60eb3bc by Andreas Klebinger at 2026-08-25T18:42:59-04:00 rts linker: Fix pointer arithmetic issue in flushInstructionCacheRISCV64 We accidentally operated over `uint64_t*` when we should use `uint8_t`. Fixes #27569 - - - - - e9bbe8f9 by Andreas Klebinger at 2026-08-26T15:09:23-04:00 cmm dumps: Add machop width info with -dppr-debug for infix ops. - - - - - 86e3a9d8 by Andreas Klebinger at 2026-08-26T15:09:24-04:00 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. - - - - - 13781cca by Andreas Klebinger at 2026-08-26T15:09:24-04:00 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. - - - - - d8fa5d7c by Andreas Klebinger at 2026-08-26T15:09:24-04:00 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. - - - - - 94822c95 by Andreas Klebinger at 2026-08-26T15:09:24-04:00 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 - - - - - dd1ba88a by Andreas Klebinger at 2026-08-26T15:09:24-04:00 cmmLint: Lint against MO_FS_Truncate subword use. - - - - - fd22f71e by Zubin Duggal at 2026-08-26T15:10:20-04:00 ghc-internal: annotateSTM should use catchSTM# rather than catch# A catch# frame inside a transaction breaks retry and async exception delivery. Fixes #27657 - - - - - bb324171 by Rodrigo Mesquita at 2026-08-26T15:10:59-04:00 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 - - - - - ed99b7b7 by Rodrigo Mesquita at 2026-08-26T15:10:59-04:00 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 - - - - - cd653714 by Alan Zimmerman at 2026-08-26T15:11:49-04:00 EPA: Uses Parsers.parseModule for exactprint tests Parsers.parseModule is the advertised way to parse for use for exact printing in the ghc-exactprint library. This commit updates the GHC exact print testing to use it. This requires moving the comment balancing that was occurring only in the test path into the advertising parser path, so it moves from Transforms.hs to Utils.hs. Also update the comment adding to honour trailing annotations - - - - - d1d01fa5 by Wolfgang Jeltsch at 2026-08-27T13:17:59+03:00 Add `rethrowSTM` and improve STM-related documentation Adding `rethrowSTM` resolves #26758. The implementation of `rethrowSTM` is completely analogous to the one of `rethrowIO`. The following is established for the documentation of `throwSTM` and `catchSTM`: * Both operations are directly described as analogs of their `IO` counterparts. * There is no reference to `throw` in the documentation of `throwSTM`, because, although such a reference is great in the documentation of `throwIO`, it is somewhat out of place in the documentation of `throwSTM`. * Instead of repeating part of `throwIO`’s documentation, the documentation of `throwSTM` just recommends using `throwSTM` instead of `throw` and references the corresponding arguments in the documentation of `throwIO`. - - - - - 06fde293 by fendor at 2026-08-28T06:06:44-04:00 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 - - - - - 024c4d04 by fendor at 2026-08-28T06:07:23-04:00 Reuse the UnitIndexCache after initialising multiple home units - - - - - 55326fa0 by Alan Zimmerman at 2026-08-28T06:08:03-04:00 EPA: Some Haddock processing tweaks These changes to the Haddock postprocessing should not change behaviour, but just bring it more closely in line with the original, changed at 44309cd377f And add some haddock exactprint tests to show they work. - - - - - b3ddee95 by Andreas Klebinger at 2026-08-28T13:57:46-04:00 hadrian: Deprecate quickest flavour. It was more of a trap for new users than actually beneficial so we deprecate it and suggest quick+no_dynamic_libs to users instead. - - - - - a1d81390 by Andreas Klebinger at 2026-08-28T13:58:37-04:00 cmm: Always favour entry block during block deduplication. We now always keep the first block in the CmmGraph. This way we avoid the need to update the entry info table. Failing to do so caused #27722. Fixes #27722. - - - - - 5bd65f00 by Andreas Klebinger at 2026-08-28T13:59:16-04:00 test: FamAppCachePerf - Only collect bytes allocated. Fixes 27747 - - - - - ced53ce6 by mangoiv at 2026-08-29T07:15:24-04:00 nightlies: output yaml to file only Previously we would just output the metadata to stdout which risks that it's clobbered by incidental debugt output. We now output to file only. Fixes #27511 - - - - - 578bd185 by Andreas Klebinger at 2026-08-29T07:16:05-04:00 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. - - - - - 7bf546fc by Simon Peyton Jones at 2026-08-31T23:48:53-04:00 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 - - - - - 5f474953 by Zubin Duggal at 2026-08-31T23:48:53-04:00 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 - - - - - cd5c6bcc by Zubin Duggal at 2026-08-31T23:48:53-04:00 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 - - - - - abfc224a by Zubin Duggal at 2026-08-31T23:48:53-04:00 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 - - - - - 1557fd1c by Zubin Duggal at 2026-08-31T23:48:53-04:00 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 - - - - - 4117e5ae by Wolfgang Jeltsch at 2026-08-31T23:49:35-04:00 Incorporate the `rethrowSTM` reexport into the `stm` submodule - - - - - 4bfbf5c8 by ARATA Mizuki at 2026-09-01T18:55:08-04:00 testsuite: Fix out-of-bounds access in T3586 unsafeRead and unsafeWrite use 0-based index. Looking at #3586, the expected output seems to be 2.8e8. Addresses #27596 - - - - - 3f9db6d4 by ARATA Mizuki at 2026-09-01T18:55:08-04:00 testsuite: Fix out-of-bounds access in T21305 writeInt64Array# takes an index measured in units of Int64 elements. Fixes #27596 - - - - - 44d7788f by Simon Peyton Jones at 2026-09-01T18:55:53-04:00 Fix buglet in INLINE-arity calculation for pattern synonyms This fixes #27744. The buglet was accidentally introduced by commit 3a0f9a51c1dacc474c7fd128082edd8bf4081256 Author: Simon Peyton Jones <simon.peytonjones(a)gmail.com> Date: Sat Aug 1 00:13:02 2026 +0100 Fix three bugs related to required type args and INLINE pragmas I failed to find all the calls to `addInlinePragArity`! - - - - - df058f1d by Simon Jakobi at 2026-09-02T07:18:06-04:00 testsuite: Migrate perf tests off collect_compiler_stats('all') The 'all' metric argument applies a single tolerance to bytes allocated, max_bytes_used and peak_megabytes_allocated, although their noise profiles are incompatible (#27653): allocations are nearly deterministic, residency needs 10-20%, and peak is quantized to 1 MB. Any single tolerance is too tight for one metric or too slack for another. This migrates the remaining users of 'all' (and of the 'all' default) to explicit per-metric collection, ahead of removing 'all' from the driver. peak_megabytes_allocated is dropped everywhere: its 1 MB granularity makes tight relative windows meaningless (#27613), and it is sensitive to GC timing. In #27489 it drifted by -5.3% while max_bytes_used moved by less than 0.1%. Where a test guards a memory property, max_bytes_used covers it at byte granularity. Where the motivating ticket was about compile-time memory (T11545, T15304, T26425), residency remains gated via max_bytes_used, now with a residency-appropriate tolerance. max_bytes_used is dropped where residency was only ever an accident of 'all': * T15630, T15630a, T20261: the underlying tickets (#15630, #20261) contain no memory data at all. One is a simplifier-ticks blowup and the other is stated entirely in allocation numbers, so the 20% window never had teeth. * T21839c: #21839's measurements show residency essentially flat (+0.16%) while allocations moved +7%, so allocations are the discriminating metric. They are already gated at 1% via collect_compiler_runtime. The ghc/max gate had previously broken CI spuriously (9fd11585eb widened it from 1% to 10% for that reason). Allocation tolerances are tightened to the testsuite's conventional 2% where 'all' previously left them at 10-20%. Assisted-by: Claude Fable 5 - - - - - 72dd2432 by Simon Jakobi at 2026-09-02T07:18:06-04:00 testsuite: Remove the 'all' metric argument of collect_stats 'all' gated bytes allocated, max_bytes_used and peak_megabytes_allocated at a single tolerance, although their noise profiles are incompatible, making such tests either flaky or toothless (#27653). Closes #27653. Assisted-by: Claude Fable 5 - - - - - 2228cb30 by Simon Jakobi at 2026-09-02T07:18:06-04:00 testsuite: Make the deviation argument of collect_stats mandatory Almost every caller passes an explicit tolerance matched to the metric's noise profile, and the silent 20% default is far slacker than 'bytes allocated' merits. Only two tests relied on it. They now state their tolerance explicitly: large-project gets 10%, in line with other large compile-time tests. T9848 gets 2%: its metric is byte-for-byte deterministic across CI jobs and platforms of a given test_env, has drifted only about 2.5% since 2015, and the fusion failure it guards against would show up as a roughly +30000% jump. Assisted-by: Claude Fable 5 - - - - - 56291fc5 by Cheng Shao at 2026-09-02T07:18:45-04:00 autoconf/ghc-toolchain: bump llvm upper bound to support llvm 23 This commit bumps llvm upper bound to support llvm 23. - - - - - 20eb3f41 by Cheng Shao at 2026-09-02T07:18:45-04:00 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. - - - - - 9e7739ab by Simon Jakobi at 2026-09-03T13:45:43-04:00 Add -Wimplicit-field-strictness (#16836) This opt-in warning fires when a data constructor field lacks an explicit strictness annotation (`!` or `~`). It complements the LazyFieldAnnotations extension (4762a8bf30f) from GHC proposal 752, which makes `~` annotations available for this purpose. Deciding which fields to report requires their levity, so the check runs after typechecking. To keep the noise down, the diagnostic is emitted once per data declaration, grouped by constructor. Closes #16836. Assisted-by: Claude Fable 5 - - - - - 6a44d591 by mangoiv at 2026-09-03T13:46:22-04:00 simplifier: remove a bogus `assert` in `rebuild_app'` in `GHC.CoreToStg.Prep.cpeApp`. Prior to this commit commit 08bc245be70d95801bc1138804ed1de9474fbdc0 Author: sheaf <sam.derbyshire(a)gmail.com> Date: Sat Feb 28 16:30:43 2026 +0100 Clean up join points, casts & ticks This commit shores up the logic dealing with casts and ticks occurring in between a join point binding and a jump any `PlaceRuntime` ticks we observed were profiling ticks, even though that isn't necessary. The more liberal rules in the above commit allow e.g. breakpoint ticks (which are valid PlaceRuntime ticks) to legitimately appear in an argument position. Fixes #27556 - - - - - eaa95a6f by Andrei Borzenkov at 2026-09-04T08:08:40-04:00 Parentheses in prefix GADT constructors (#27423) Updated `splitLHsGadtTy` to allow looking through the parentheses for inner binders. General example of a code pattern that's allowed now: data S a where MkS :: (forall a. S a) That should work now with any combination of nested foralls and parentheses. We don't perform parenthesis unwrapping for record GADT constructors in accordance with GHC Proposal #402. To this end `con_inner_bndrs` no longer stores plain forall telescopes: `[HsForAllTelescope pass]` is replaced with `[LHsGadtTelescope pass]`, a new `HsArg`-style type whose `HsGadtForAll` holds an inner telescope and whose `HsGadtPar` holds a pair of parentheses. The parentheses carry no meaning for renaming or type checking; the only reason to record them is exact-printing. Updated `pprConDecl` to improve the `parse == parse . ppr . parse` property of GADT pretty-printing. The pretty printer can now output code that's similar to this: data T a where MkT1 :: (forall a. T a) MkT2 :: forall . forall a. T a These are special cases of inner forall binders for prefix GADT constructors, when we have either implicit or zero explicit outer binders. - - - - - 639456a8 by Evgeny Malyshev at 2026-09-04T08:09:25-04:00 HsPat: Add spacing to unary tuple patterns Use hsep when printing unary boxed TuplePat applications so that the MkSolo constructor is separated from its argument. The old hcat rendered wildcard and parenthesized arguments as MkSolo_ and MkSolo(). Add T27034 to exercise the HsPat splice-dump path with wildcard and variable arguments, and update existing affected golden output. Fixes #27034 Assisted-By: OpenAI Codex - - - - - 2908ab36 by Simon Jakobi at 2026-09-05T07:22:17-04:00 X86 NCG: use btr/bts/btc for single-bit operations Previously the Cmm patterns x & ~(1 << i) x | (1 << i) x ^ (1 << i) compiled to mov/shl/not/and-style sequences of 3-4 instructions. Now they compile to a single btr, bts or btc, matching what C compilers produce. When the bit index is a literal, constant folding has already collapsed these patterns into ones with a literal mask, such as x & 0xfffffeffffffffff for x & ~(1 << 40). Such masks are now also compiled to a bit-test instruction when they don't fit in an imm32 and would otherwise have to be loaded into a register first. For a variable bit index, this applies only when the shift is unchecked (uncheckedShiftL#, Data.Bits.unsafeShiftL): the bounds-checked shiftL used by e.g. the default clearBit/setBit/complementBit implementations wraps the shift in a bounds mask that this optimisation does not see through. With a literal index, the bounds mask is constant-folded away, so the checked operations benefit too. See Note [Bit-test instructions] in GHC.CmmToAsm.X86.CodeGen. Fixes #25233. Assisted-by: Claude Fable 5 - - - - - c673ecf0 by Simon Peyton Jones at 2026-09-05T07:22:59-04:00 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 - - - - - 5939ceaf by sheaf at 2026-09-05T22:06:18-04:00 Windows: enforce path convention in ./configure As detailed in Note [MSYS paths] in Hadrian.Utilities, the standing convention (using Windows-style paths with forward slashes) is now enforced in ./configure instead of within Hadrian, removing the need for 'cygpath' calls within Hadrian. Fixes #26683 - - - - - a6061455 by sheaf at 2026-09-05T22:06:18-04:00 Hadrian: introduce ExeSpawnPath Specific details about the filepath used to specify the executable to spawn with CreateProcess matters on Windows: whether we use forward or backward slashes, a leading ./, or an absolute path changes how the executable is found. This commit introduces 'ExeSpawnPath' which is a path that is guaranteed to be found when spawning a process. All command invocations now go through this type to ensure the path has been properly sanitised. See Note [NeedCurrentDirectoryForExePath] in Hadrian.Utilities. The same treatment is applied to hsc2hs. Updates hsc2hs submodule. - - - - - e28313e3 by sheaf at 2026-09-05T22:07:06-04:00 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 - - - - - 3172f557 by sheaf at 2026-09-05T22:07:06-04:00 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. - - - - - 192be0b6 by Luite Stegeman at 2026-09-07T19:43:36-04:00 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 - - - - - 604eb43c by Simon Jakobi at 2026-09-07T19:44:15-04:00 Hadrian: don't capture the testsuite driver's output (#27780) a6061455d54 switched the Testsuite RunTest case from Shake's cmd to the cmd' wrapper. cmd' always captures stdout and stderr, and since the caller asks for Exit, it returns without dumping what it captured. As a result the testsuite output no longer appears in CI job logs: failures, performance metrics and the summary were lost with the job. Use cmdExe, the uncaptured cmd, as the other plain-cmd sites in that commit do. Fixes #27780. Assisted-by: Claude Fable 5.1 - - - - - 06eee015 by Luite Stegeman at 2026-09-08T06:03:06+02:00 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 - - - - - f8b2bd8f by Alan Zimmerman at 2026-09-08T09:39:12-04:00 EPA Fix HsCmdDo exact print with comments Exact printing of HsCmdDo was ignoring the location for the do statements, and this is an annotation that can have comments in it. Update it so we print the statements as a unit, including any comments. Also add the result of auditing that we capture comments in all needed places, noting that the remaining Anno SrcSpan instances are benign. - - - - - 430967ab by Duncan Coutts at 2026-09-09T11:07:01+01:00 Reorder cmm decls in HeapStackCheck for a better logical grouping And put more section headers in to deliniate the groups. We're about to add more here, so better to organise it first. - - - - - 344080fd by Duncan Coutts at 2026-09-09T11:07:01+01:00 Add raisePrimIOException and add it to RTS<->ghc-internal API The raisePrimIOException is a new helper function that I/O primops will use to help them report I/O errors. This is implemented in Haskell (since that's a lot easier), but has a calling convention that is easy(ish) to use from Cmm in the I/O primops. So we add it to the RTS API struct, and since we'll use it from Cmm we also need a field accessor macro for cmm (in deriveConstants). See the Note about how we cannot have nice things due to async exceptions and thunks preventing us from using catch. - - - - - cfdb3399 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Add new blocking functions for I/O primops See the Note [Thread blocking for new I/O primops], and the Note [Calling convention for raisePrimIOException]. The point is, it will allow us to report synchronous exceptions from I/O primops, and do so much more flexibly. Previously the I/O managers could only report async exceptions and only nullary exceptions. This was OK historically, but no good as we add more I/O managers and expand the range of I/O operations we support. - - - - - f09c09d8 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Change the encoding of results from the I/O manager to I/O primops Previously we just had async continue or heap overflow. We now extend what we can report with synchronous success, and synchronous failure with an errno. See Note [Encoding of result of I/O manager operations] We don't use these two new cases yet, but we will. In particular an epoll I/O manager needs to be able to report synchronous success or failure for waitRead#/waitWrite#. - - - - - 30f074d9 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Switch waitRead/Write# to use new blocking return frames and update the I/O managers to set the result before resuming the blocked threads. This makes it possible for I/O managers to report synchronous exceptions from the I/O primops, but that will be done in a subsequent commit. - - - - - a8786ced by Duncan Coutts at 2026-09-09T11:07:01+01:00 Switch Poll and Select I/O managers to report sync exceptions rather than using raiseAsync with blockedOnBadFD_closure. This uses the new mechanism in the blocking frame return code to report synchronous exceptions. - - - - - 7a9df79a by Duncan Coutts at 2026-09-09T11:07:01+01:00 Remove now-unused blockedOnBadFD It was previously thrown by the select and poll I/O managers, but now they use raisePrimIOException (with an EBADF errno). - - - - - 6b0424e3 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Improve the docs for delay# waitRead# and waitWrite# Document that the waitRead/Write# can throw exceptions (this was true before too), and that all of them are async exception cancellation points. - - - - - afeb2c30 by Duncan Coutts at 2026-09-09T20:08:58-04:00 Enable printf warnings for trace functions and fix resulting warnings Most of the existing printf-style functions are annotated with attributes to enable gcc/clang warnings for the printf format string, but several trace functions in Trace.h were missing this annotation. Enable them, and fix the resulting warnings. - - - - - 9a442c93 by Alan Zimmerman at 2026-09-09T20:09:36-04:00 EPA: Exact print ConDeclGADT without custom enterAnn !16321 brought in explicit capture of parens in a ConDeclGADT. The ExactPrint update introduced a modification of the fundamental function in exact printing, `enterAnn`, by splitting it into a version allowing injection of functionality normally handled by the ExactPrint class methods. This commit refactors that code, to restore the prior `enterAnn` version, by following the convention in ExactPrint of introducing a helper data structure with its own `ExactPrint` instance to achieve the same effect. - - - - - d5caaaa9 by fendor at 2026-09-10T16:17:57+02:00 Add support for ghc-debug to ghc executable - - - - - 2008 changed files: - .gitignore - .gitlab-ci.yml - .gitlab/ci.sh - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - .gitlab/merge_request_templates/Default.md - .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py - .gitlab/test-metrics.sh - .gitmodules - boot - + changelog.d/21101 - + changelog.d/26616 - + changelog.d/27380 - + changelog.d/27532 - + changelog.d/27556 - + changelog.d/27626 - + changelog.d/27627 - + changelog.d/27703 - + changelog.d/27704 - + changelog.d/27717 - + changelog.d/AbstractQ - + changelog.d/T17833 - + changelog.d/T20363 - + changelog.d/T21176 - + changelog.d/T21628 - + changelog.d/T26423 - + changelog.d/T26532 - + changelog.d/T26716 - 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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/04894732f398b6d0ca7580ce701307… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/04894732f398b6d0ca7580ce701307… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/mangoiv/ci-stages] 67 commits: Add `rethrowSTM` and improve STM-related documentation
by Magnus (＠MangoIV) 10 Sep '26

10 Sep '26

Magnus pushed to branch wip/mangoiv/ci-stages at Glasgow Haskell Compiler / GHC Commits: d1d01fa5 by Wolfgang Jeltsch at 2026-08-27T13:17:59+03:00 Add `rethrowSTM` and improve STM-related documentation Adding `rethrowSTM` resolves #26758. The implementation of `rethrowSTM` is completely analogous to the one of `rethrowIO`. The following is established for the documentation of `throwSTM` and `catchSTM`: * Both operations are directly described as analogs of their `IO` counterparts. * There is no reference to `throw` in the documentation of `throwSTM`, because, although such a reference is great in the documentation of `throwIO`, it is somewhat out of place in the documentation of `throwSTM`. * Instead of repeating part of `throwIO`’s documentation, the documentation of `throwSTM` just recommends using `throwSTM` instead of `throw` and references the corresponding arguments in the documentation of `throwIO`. - - - - - 06fde293 by fendor at 2026-08-28T06:06:44-04:00 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 - - - - - 024c4d04 by fendor at 2026-08-28T06:07:23-04:00 Reuse the UnitIndexCache after initialising multiple home units - - - - - 55326fa0 by Alan Zimmerman at 2026-08-28T06:08:03-04:00 EPA: Some Haddock processing tweaks These changes to the Haddock postprocessing should not change behaviour, but just bring it more closely in line with the original, changed at 44309cd377f And add some haddock exactprint tests to show they work. - - - - - b3ddee95 by Andreas Klebinger at 2026-08-28T13:57:46-04:00 hadrian: Deprecate quickest flavour. It was more of a trap for new users than actually beneficial so we deprecate it and suggest quick+no_dynamic_libs to users instead. - - - - - a1d81390 by Andreas Klebinger at 2026-08-28T13:58:37-04:00 cmm: Always favour entry block during block deduplication. We now always keep the first block in the CmmGraph. This way we avoid the need to update the entry info table. Failing to do so caused #27722. Fixes #27722. - - - - - 5bd65f00 by Andreas Klebinger at 2026-08-28T13:59:16-04:00 test: FamAppCachePerf - Only collect bytes allocated. Fixes 27747 - - - - - ced53ce6 by mangoiv at 2026-08-29T07:15:24-04:00 nightlies: output yaml to file only Previously we would just output the metadata to stdout which risks that it's clobbered by incidental debugt output. We now output to file only. Fixes #27511 - - - - - 578bd185 by Andreas Klebinger at 2026-08-29T07:16:05-04:00 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. - - - - - 7bf546fc by Simon Peyton Jones at 2026-08-31T23:48:53-04:00 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 - - - - - 5f474953 by Zubin Duggal at 2026-08-31T23:48:53-04:00 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 - - - - - cd5c6bcc by Zubin Duggal at 2026-08-31T23:48:53-04:00 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 - - - - - abfc224a by Zubin Duggal at 2026-08-31T23:48:53-04:00 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 - - - - - 1557fd1c by Zubin Duggal at 2026-08-31T23:48:53-04:00 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 - - - - - 4117e5ae by Wolfgang Jeltsch at 2026-08-31T23:49:35-04:00 Incorporate the `rethrowSTM` reexport into the `stm` submodule - - - - - 4bfbf5c8 by ARATA Mizuki at 2026-09-01T18:55:08-04:00 testsuite: Fix out-of-bounds access in T3586 unsafeRead and unsafeWrite use 0-based index. Looking at #3586, the expected output seems to be 2.8e8. Addresses #27596 - - - - - 3f9db6d4 by ARATA Mizuki at 2026-09-01T18:55:08-04:00 testsuite: Fix out-of-bounds access in T21305 writeInt64Array# takes an index measured in units of Int64 elements. Fixes #27596 - - - - - 44d7788f by Simon Peyton Jones at 2026-09-01T18:55:53-04:00 Fix buglet in INLINE-arity calculation for pattern synonyms This fixes #27744. The buglet was accidentally introduced by commit 3a0f9a51c1dacc474c7fd128082edd8bf4081256 Author: Simon Peyton Jones <simon.peytonjones(a)gmail.com> Date: Sat Aug 1 00:13:02 2026 +0100 Fix three bugs related to required type args and INLINE pragmas I failed to find all the calls to `addInlinePragArity`! - - - - - df058f1d by Simon Jakobi at 2026-09-02T07:18:06-04:00 testsuite: Migrate perf tests off collect_compiler_stats('all') The 'all' metric argument applies a single tolerance to bytes allocated, max_bytes_used and peak_megabytes_allocated, although their noise profiles are incompatible (#27653): allocations are nearly deterministic, residency needs 10-20%, and peak is quantized to 1 MB. Any single tolerance is too tight for one metric or too slack for another. This migrates the remaining users of 'all' (and of the 'all' default) to explicit per-metric collection, ahead of removing 'all' from the driver. peak_megabytes_allocated is dropped everywhere: its 1 MB granularity makes tight relative windows meaningless (#27613), and it is sensitive to GC timing. In #27489 it drifted by -5.3% while max_bytes_used moved by less than 0.1%. Where a test guards a memory property, max_bytes_used covers it at byte granularity. Where the motivating ticket was about compile-time memory (T11545, T15304, T26425), residency remains gated via max_bytes_used, now with a residency-appropriate tolerance. max_bytes_used is dropped where residency was only ever an accident of 'all': * T15630, T15630a, T20261: the underlying tickets (#15630, #20261) contain no memory data at all. One is a simplifier-ticks blowup and the other is stated entirely in allocation numbers, so the 20% window never had teeth. * T21839c: #21839's measurements show residency essentially flat (+0.16%) while allocations moved +7%, so allocations are the discriminating metric. They are already gated at 1% via collect_compiler_runtime. The ghc/max gate had previously broken CI spuriously (9fd11585eb widened it from 1% to 10% for that reason). Allocation tolerances are tightened to the testsuite's conventional 2% where 'all' previously left them at 10-20%. Assisted-by: Claude Fable 5 - - - - - 72dd2432 by Simon Jakobi at 2026-09-02T07:18:06-04:00 testsuite: Remove the 'all' metric argument of collect_stats 'all' gated bytes allocated, max_bytes_used and peak_megabytes_allocated at a single tolerance, although their noise profiles are incompatible, making such tests either flaky or toothless (#27653). Closes #27653. Assisted-by: Claude Fable 5 - - - - - 2228cb30 by Simon Jakobi at 2026-09-02T07:18:06-04:00 testsuite: Make the deviation argument of collect_stats mandatory Almost every caller passes an explicit tolerance matched to the metric's noise profile, and the silent 20% default is far slacker than 'bytes allocated' merits. Only two tests relied on it. They now state their tolerance explicitly: large-project gets 10%, in line with other large compile-time tests. T9848 gets 2%: its metric is byte-for-byte deterministic across CI jobs and platforms of a given test_env, has drifted only about 2.5% since 2015, and the fusion failure it guards against would show up as a roughly +30000% jump. Assisted-by: Claude Fable 5 - - - - - 56291fc5 by Cheng Shao at 2026-09-02T07:18:45-04:00 autoconf/ghc-toolchain: bump llvm upper bound to support llvm 23 This commit bumps llvm upper bound to support llvm 23. - - - - - 20eb3f41 by Cheng Shao at 2026-09-02T07:18:45-04:00 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. - - - - - 9e7739ab by Simon Jakobi at 2026-09-03T13:45:43-04:00 Add -Wimplicit-field-strictness (#16836) This opt-in warning fires when a data constructor field lacks an explicit strictness annotation (`!` or `~`). It complements the LazyFieldAnnotations extension (4762a8bf30f) from GHC proposal 752, which makes `~` annotations available for this purpose. Deciding which fields to report requires their levity, so the check runs after typechecking. To keep the noise down, the diagnostic is emitted once per data declaration, grouped by constructor. Closes #16836. Assisted-by: Claude Fable 5 - - - - - 6a44d591 by mangoiv at 2026-09-03T13:46:22-04:00 simplifier: remove a bogus `assert` in `rebuild_app'` in `GHC.CoreToStg.Prep.cpeApp`. Prior to this commit commit 08bc245be70d95801bc1138804ed1de9474fbdc0 Author: sheaf <sam.derbyshire(a)gmail.com> Date: Sat Feb 28 16:30:43 2026 +0100 Clean up join points, casts & ticks This commit shores up the logic dealing with casts and ticks occurring in between a join point binding and a jump any `PlaceRuntime` ticks we observed were profiling ticks, even though that isn't necessary. The more liberal rules in the above commit allow e.g. breakpoint ticks (which are valid PlaceRuntime ticks) to legitimately appear in an argument position. Fixes #27556 - - - - - eaa95a6f by Andrei Borzenkov at 2026-09-04T08:08:40-04:00 Parentheses in prefix GADT constructors (#27423) Updated `splitLHsGadtTy` to allow looking through the parentheses for inner binders. General example of a code pattern that's allowed now: data S a where MkS :: (forall a. S a) That should work now with any combination of nested foralls and parentheses. We don't perform parenthesis unwrapping for record GADT constructors in accordance with GHC Proposal #402. To this end `con_inner_bndrs` no longer stores plain forall telescopes: `[HsForAllTelescope pass]` is replaced with `[LHsGadtTelescope pass]`, a new `HsArg`-style type whose `HsGadtForAll` holds an inner telescope and whose `HsGadtPar` holds a pair of parentheses. The parentheses carry no meaning for renaming or type checking; the only reason to record them is exact-printing. Updated `pprConDecl` to improve the `parse == parse . ppr . parse` property of GADT pretty-printing. The pretty printer can now output code that's similar to this: data T a where MkT1 :: (forall a. T a) MkT2 :: forall . forall a. T a These are special cases of inner forall binders for prefix GADT constructors, when we have either implicit or zero explicit outer binders. - - - - - 639456a8 by Evgeny Malyshev at 2026-09-04T08:09:25-04:00 HsPat: Add spacing to unary tuple patterns Use hsep when printing unary boxed TuplePat applications so that the MkSolo constructor is separated from its argument. The old hcat rendered wildcard and parenthesized arguments as MkSolo_ and MkSolo(). Add T27034 to exercise the HsPat splice-dump path with wildcard and variable arguments, and update existing affected golden output. Fixes #27034 Assisted-By: OpenAI Codex - - - - - 2908ab36 by Simon Jakobi at 2026-09-05T07:22:17-04:00 X86 NCG: use btr/bts/btc for single-bit operations Previously the Cmm patterns x & ~(1 << i) x | (1 << i) x ^ (1 << i) compiled to mov/shl/not/and-style sequences of 3-4 instructions. Now they compile to a single btr, bts or btc, matching what C compilers produce. When the bit index is a literal, constant folding has already collapsed these patterns into ones with a literal mask, such as x & 0xfffffeffffffffff for x & ~(1 << 40). Such masks are now also compiled to a bit-test instruction when they don't fit in an imm32 and would otherwise have to be loaded into a register first. For a variable bit index, this applies only when the shift is unchecked (uncheckedShiftL#, Data.Bits.unsafeShiftL): the bounds-checked shiftL used by e.g. the default clearBit/setBit/complementBit implementations wraps the shift in a bounds mask that this optimisation does not see through. With a literal index, the bounds mask is constant-folded away, so the checked operations benefit too. See Note [Bit-test instructions] in GHC.CmmToAsm.X86.CodeGen. Fixes #25233. Assisted-by: Claude Fable 5 - - - - - c673ecf0 by Simon Peyton Jones at 2026-09-05T07:22:59-04:00 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 - - - - - 5939ceaf by sheaf at 2026-09-05T22:06:18-04:00 Windows: enforce path convention in ./configure As detailed in Note [MSYS paths] in Hadrian.Utilities, the standing convention (using Windows-style paths with forward slashes) is now enforced in ./configure instead of within Hadrian, removing the need for 'cygpath' calls within Hadrian. Fixes #26683 - - - - - a6061455 by sheaf at 2026-09-05T22:06:18-04:00 Hadrian: introduce ExeSpawnPath Specific details about the filepath used to specify the executable to spawn with CreateProcess matters on Windows: whether we use forward or backward slashes, a leading ./, or an absolute path changes how the executable is found. This commit introduces 'ExeSpawnPath' which is a path that is guaranteed to be found when spawning a process. All command invocations now go through this type to ensure the path has been properly sanitised. See Note [NeedCurrentDirectoryForExePath] in Hadrian.Utilities. The same treatment is applied to hsc2hs. Updates hsc2hs submodule. - - - - - e28313e3 by sheaf at 2026-09-05T22:07:06-04:00 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 - - - - - 3172f557 by sheaf at 2026-09-05T22:07:06-04:00 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. - - - - - 192be0b6 by Luite Stegeman at 2026-09-07T19:43:36-04:00 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 - - - - - 604eb43c by Simon Jakobi at 2026-09-07T19:44:15-04:00 Hadrian: don't capture the testsuite driver's output (#27780) a6061455d54 switched the Testsuite RunTest case from Shake's cmd to the cmd' wrapper. cmd' always captures stdout and stderr, and since the caller asks for Exit, it returns without dumping what it captured. As a result the testsuite output no longer appears in CI job logs: failures, performance metrics and the summary were lost with the job. Use cmdExe, the uncaptured cmd, as the other plain-cmd sites in that commit do. Fixes #27780. Assisted-by: Claude Fable 5.1 - - - - - 06eee015 by Luite Stegeman at 2026-09-08T06:03:06+02:00 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 - - - - - f8b2bd8f by Alan Zimmerman at 2026-09-08T09:39:12-04:00 EPA Fix HsCmdDo exact print with comments Exact printing of HsCmdDo was ignoring the location for the do statements, and this is an annotation that can have comments in it. Update it so we print the statements as a unit, including any comments. Also add the result of auditing that we capture comments in all needed places, noting that the remaining Anno SrcSpan instances are benign. - - - - - 430967ab by Duncan Coutts at 2026-09-09T11:07:01+01:00 Reorder cmm decls in HeapStackCheck for a better logical grouping And put more section headers in to deliniate the groups. We're about to add more here, so better to organise it first. - - - - - 344080fd by Duncan Coutts at 2026-09-09T11:07:01+01:00 Add raisePrimIOException and add it to RTS<->ghc-internal API The raisePrimIOException is a new helper function that I/O primops will use to help them report I/O errors. This is implemented in Haskell (since that's a lot easier), but has a calling convention that is easy(ish) to use from Cmm in the I/O primops. So we add it to the RTS API struct, and since we'll use it from Cmm we also need a field accessor macro for cmm (in deriveConstants). See the Note about how we cannot have nice things due to async exceptions and thunks preventing us from using catch. - - - - - cfdb3399 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Add new blocking functions for I/O primops See the Note [Thread blocking for new I/O primops], and the Note [Calling convention for raisePrimIOException]. The point is, it will allow us to report synchronous exceptions from I/O primops, and do so much more flexibly. Previously the I/O managers could only report async exceptions and only nullary exceptions. This was OK historically, but no good as we add more I/O managers and expand the range of I/O operations we support. - - - - - f09c09d8 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Change the encoding of results from the I/O manager to I/O primops Previously we just had async continue or heap overflow. We now extend what we can report with synchronous success, and synchronous failure with an errno. See Note [Encoding of result of I/O manager operations] We don't use these two new cases yet, but we will. In particular an epoll I/O manager needs to be able to report synchronous success or failure for waitRead#/waitWrite#. - - - - - 30f074d9 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Switch waitRead/Write# to use new blocking return frames and update the I/O managers to set the result before resuming the blocked threads. This makes it possible for I/O managers to report synchronous exceptions from the I/O primops, but that will be done in a subsequent commit. - - - - - a8786ced by Duncan Coutts at 2026-09-09T11:07:01+01:00 Switch Poll and Select I/O managers to report sync exceptions rather than using raiseAsync with blockedOnBadFD_closure. This uses the new mechanism in the blocking frame return code to report synchronous exceptions. - - - - - 7a9df79a by Duncan Coutts at 2026-09-09T11:07:01+01:00 Remove now-unused blockedOnBadFD It was previously thrown by the select and poll I/O managers, but now they use raisePrimIOException (with an EBADF errno). - - - - - 6b0424e3 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Improve the docs for delay# waitRead# and waitWrite# Document that the waitRead/Write# can throw exceptions (this was true before too), and that all of them are async exception cancellation points. - - - - - afeb2c30 by Duncan Coutts at 2026-09-09T20:08:58-04:00 Enable printf warnings for trace functions and fix resulting warnings Most of the existing printf-style functions are annotated with attributes to enable gcc/clang warnings for the printf format string, but several trace functions in Trace.h were missing this annotation. Enable them, and fix the resulting warnings. - - - - - 9a442c93 by Alan Zimmerman at 2026-09-09T20:09:36-04:00 EPA: Exact print ConDeclGADT without custom enterAnn !16321 brought in explicit capture of parens in a ConDeclGADT. The ExactPrint update introduced a modification of the fundamental function in exact printing, `enterAnn`, by splitting it into a version allowing injection of functionality normally handled by the ExactPrint class methods. This commit refactors that code, to restore the prior `enterAnn` version, by following the convention in ExactPrint of introducing a helper data structure with its own `ExactPrint` instance to achieve the same effect. - - - - - a2140eac by mangoiv at 2026-09-10T11:12:57+02:00 ci: build and test stage - - - - - b37f4b6c by mangoiv at 2026-09-10T11:12:57+02:00 chore: reorder packaging and testing stages - - - - - 03975a1e by mangoiv at 2026-09-10T11:12:57+02:00 fixup! ci: build and test stage - - - - - bd3b50f6 by mangoiv at 2026-09-10T11:12:57+02:00 fixup! ci: build and test stage - - - - - c35a4db8 by mangoiv at 2026-09-10T11:12:57+02:00 fixup! ci: build and test stage - - - - - a042e11f by mangoiv at 2026-09-10T11:12:57+02:00 fixup! ci: build and test stage - - - - - e7cd83d2 by mangoiv at 2026-09-10T11:12:58+02:00 revert: don't run stage1 tests - - - - - fcb9af91 by mangoiv at 2026-09-10T11:12:58+02:00 revert: don't test-in-tree-files - - - - - d20d3d6e by mangoiv at 2026-09-10T11:12:58+02:00 fix: out of tree compiler does not imply no hadrian being available - - - - - 3903f2a7 by mangoiv at 2026-09-10T11:12:58+02:00 fix: don't do msys deps check on stage1 compiler - - - - - a36d2bc7 by mangoiv at 2026-09-10T11:12:58+02:00 configure: fix sed script and subst tooldir script Fixes #27672 - - - - - 81f05f1d by mangoiv at 2026-09-10T11:12:58+02:00 testsuite: flush more often when running testsuite - - - - - 66bf5ca1 by mangoiv at 2026-09-10T11:12:58+02:00 Allow metric decreases on windows Metric Decrease: LinkableUsage01 MultiLayerModulesTH_OneShot T10547 T12234 T12425 T13035 T13253-spj T13820 T18140 T18730 T18923 T9198 TcPlugin_RewritePerf mhu-perf - - - - - 273fde0c by mangoiv at 2026-09-10T11:12:58+02:00 fixup! ci: build and test stage - - - - - af284a9f by mangoiv at 2026-09-10T11:14:58+02:00 fixup! ci: build and test stage - - - - - c78fde2c by mangoiv at 2026-09-10T11:24:59+02:00 fixup! ci: build and test stage - - - - - 3c98bead by mangoiv at 2026-09-10T11:25:01+02:00 ci: stop using ellipses in testsuite output and output env before invoking hadrian - - - - - f652b961 by mangoiv at 2026-09-10T11:25:01+02:00 fixup! ci: stop using ellipses in testsuite output and output env before invoking hadrian - - - - - 7e460303 by mangoiv at 2026-09-10T11:25:01+02:00 ci: clean up env before running tests even more - - - - - c1c5289c by mangoiv at 2026-09-10T15:49:39+02:00 fixup! ci: build and test stage - - - - - 316 changed files: - .gitlab-ci.yml - .gitlab/ci.sh - .gitlab/common.sh - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py - + changelog.d/27556 - + changelog.d/27627 - + changelog.d/27703 - + changelog.d/27704 - + changelog.d/27717 - changelog.d/T27202 - + changelog.d/T27705 - + changelog.d/T27722-cbe-entry-block.md - + changelog.d/T27744 - + changelog.d/T27749 - + changelog.d/T27764 - + changelog.d/allow-gadt-prefix-con-parens - + changelog.d/fix-parallel-gc-selector-race-27477 - + changelog.d/implicit-field-strictness-warning - changelog.d/lazy-field-annotations - + changelog.d/llvm-23 - + changelog.d/ncg-x86-bit-test-instructions - + changelog.d/rethrow-stm - changelog.d/unit-index - compiler/GHC/Builtin/primops.txt.pp - compiler/GHC/Cmm/CommonBlockElim.hs - compiler/GHC/Cmm/DebugBlock.hs - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToAsm/X86/Instr.hs - compiler/GHC/CmmToAsm/X86/Ppr.hs - compiler/GHC/Core.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/GenerateCgIPEStub.hs - compiler/GHC/Driver/Main/Compile.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Driver/Session/Units.hs - compiler/GHC/Hs/Decls.hs - compiler/GHC/Hs/Doc.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/Extension/Pass.hs - compiler/GHC/Hs/Instances.hs - compiler/GHC/Hs/Pat.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/IfaceToCore.hs - compiler/GHC/Parser/PostProcess/Haddock.hs - compiler/GHC/Rename/Expr.hs - compiler/GHC/Rename/HsType.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/Stg/Debug.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Gen/HsType.hs - compiler/GHC/Tc/TyCl.hs - compiler/GHC/Tc/TyCl/PatSyn.hs - compiler/GHC/Types/Demand.hs - compiler/GHC/Types/Error/Codes.hs - compiler/GHC/Types/Hint.hs - compiler/GHC/Types/Hint/Ppr.hs - compiler/GHC/Types/Id/Info.hs - compiler/GHC/Types/Id/Make.hs - compiler/GHC/Types/Literal.hs - compiler/GHC/Types/Tickish.hs - compiler/Language/Haskell/Syntax/Decls.hs - compiler/Language/Haskell/Syntax/Type.hs - configure.ac - distrib/configure.ac.in - docs/users_guide/exts/gadt_syntax.rst - docs/users_guide/exts/strict.rst - docs/users_guide/using-warnings.rst - + flake.lock - + flake.nix - ghc/GHCi/UI.hs - hadrian/README.md - hadrian/doc/cross-compile.md - hadrian/doc/flavours.md - hadrian/doc/make.md - hadrian/doc/windows.md - hadrian/hadrian.cabal - hadrian/src/Base.hs - hadrian/src/Builder.hs - hadrian/src/CommandLine.hs - hadrian/src/Context.hs - hadrian/src/Flavour.hs - hadrian/src/Hadrian/Builder.hs - hadrian/src/Hadrian/Builder/Ar.hs - hadrian/src/Hadrian/Haskell/Hash.hs - hadrian/src/Hadrian/Oracles/Path.hs - hadrian/src/Hadrian/Package.hs - hadrian/src/Hadrian/Utilities.hs - hadrian/src/Oracles/Flag.hs - hadrian/src/Oracles/Setting.hs - hadrian/src/Oracles/TestSettings.hs - hadrian/src/Packages.hs - hadrian/src/Rules/BinaryDist.hs - hadrian/src/Rules/Changelog.hs - hadrian/src/Rules/Codes.hs - hadrian/src/Rules/Generate.hs - hadrian/src/Rules/Lint.hs - hadrian/src/Rules/Nofib.hs - hadrian/src/Rules/Program.hs - hadrian/src/Rules/Test.hs - hadrian/src/Settings.hs - hadrian/src/Settings/Builders/DeriveConstants.hs - hadrian/src/Settings/Builders/RunTest.hs - − hadrian/src/Settings/Flavours/Quickest.hs - hadrian/src/Settings/Packages.hs - libraries/base/src/GHC/Conc.hs - libraries/base/tests/all.T - libraries/ghc-internal/include/RtsIfaceSymbols.h - libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs - libraries/ghc-internal/src/GHC/Internal/Event/Thread.hs - libraries/ghc-internal/src/GHC/Internal/STM.hs - libraries/stm - m4/find_python.m4 - + m4/fp_canonicalise_win_path.m4 - m4/fp_find_nm.m4 - m4/fp_find_root.m4 - m4/fp_prog_ar.m4 - m4/fp_prog_ar_args.m4 - m4/fp_prog_sh.m4 - m4/fptools_alex.m4 - m4/fptools_happy.m4 - m4/subst_tooldir.m4 - rts/Capability.c - rts/Continuation.c - rts/HeapStackCheck.cmm - rts/IOManager.c - rts/IOManager.h - rts/IOManagerInternals.h - rts/Interpreter.c - rts/Messages.c - rts/Prelude.h - rts/PrimOps.cmm - rts/Printer.c - rts/ProfHeap.c - rts/STM.c - rts/Schedule.c - rts/Sparks.c - rts/StableName.c - rts/ThreadPaused.c - rts/Threads.c - rts/Trace.h - rts/eventlog/EventLog.c - rts/include/rts/RtsToHsIface.h - rts/include/stg/MiscClosures.h - rts/posix/Poll.c - rts/posix/Poll.h - rts/posix/Select.c - rts/posix/Timeout.c - rts/prim/atomic.c - rts/sm/Compact.c - rts/sm/Evac.c - rts/sm/GC.c - rts/sm/GCUtils.c - rts/sm/MBlock.c - rts/sm/NonMoving.c - rts/sm/NonMovingMark.c - rts/sm/Storage.c - rts/sm/Sweep.c - testsuite/driver/README.md - testsuite/driver/runtests.py - testsuite/driver/testlib.py - + testsuite/tests/bytecode/T27633/Obj.hs - + testsuite/tests/bytecode/T27633/T27633a.hs - + testsuite/tests/bytecode/T27633/T27633a.stdout - + testsuite/tests/bytecode/T27633/T27633b.hs - + testsuite/tests/bytecode/T27633/T27633b.stdout - + testsuite/tests/bytecode/T27633/all.T - + testsuite/tests/codeGen/should_gen_asm/T25233.asm - + testsuite/tests/codeGen/should_gen_asm/T25233.hs - + testsuite/tests/codeGen/should_gen_asm/T25233b.asm - + testsuite/tests/codeGen/should_gen_asm/T25233b.cmm - testsuite/tests/codeGen/should_gen_asm/all.T - + testsuite/tests/core-to-stg/T27627/Callee.hs - + testsuite/tests/core-to-stg/T27627/Caller.hs - + testsuite/tests/core-to-stg/T27627/Main.hs - + testsuite/tests/core-to-stg/T27627/T27627.stdout - + testsuite/tests/core-to-stg/T27627/all.T - + testsuite/tests/core-to-stg/T27627a/Callee.hs - + testsuite/tests/core-to-stg/T27627a/Caller.hs - + testsuite/tests/core-to-stg/T27627a/Main.hs - + testsuite/tests/core-to-stg/T27627a/T27627a.stdout - + testsuite/tests/core-to-stg/T27627a/all.T - + testsuite/tests/core-to-stg/T27627b/Callee.hs - + testsuite/tests/core-to-stg/T27627b/Caller.hs - + testsuite/tests/core-to-stg/T27627b/Main.hs - + testsuite/tests/core-to-stg/T27627b/T27627b.stdout - + testsuite/tests/core-to-stg/T27627b/all.T - + testsuite/tests/core-to-stg/T27627c/Callee.hs - + testsuite/tests/core-to-stg/T27627c/Caller.hs - + testsuite/tests/core-to-stg/T27627c/Main.hs - + testsuite/tests/core-to-stg/T27627c/T27627c.stdout - + testsuite/tests/core-to-stg/T27627c/all.T - + testsuite/tests/core-to-stg/T27627e.hs - + testsuite/tests/core-to-stg/T27627e.stdout - + testsuite/tests/core-to-stg/T27627f/Callee.hs - + testsuite/tests/core-to-stg/T27627f/Caller.hs - + testsuite/tests/core-to-stg/T27627f/Inst.hs - + testsuite/tests/core-to-stg/T27627f/Main.hs - + testsuite/tests/core-to-stg/T27627f/T27627f.stdout - + testsuite/tests/core-to-stg/T27627f/all.T - + testsuite/tests/core-to-stg/T27704/Callee.hs - + testsuite/tests/core-to-stg/T27704/Callee.hs-boot - + testsuite/tests/core-to-stg/T27704/Main.hs - + testsuite/tests/core-to-stg/T27704/Mid.hs - + testsuite/tests/core-to-stg/T27704/T27704.stdout - + testsuite/tests/core-to-stg/T27704/all.T - + testsuite/tests/core-to-stg/T27704a/Callee.hs - + testsuite/tests/core-to-stg/T27704a/Callee.hs-boot - + testsuite/tests/core-to-stg/T27704a/Main.hs - + testsuite/tests/core-to-stg/T27704a/Mid.hs - + testsuite/tests/core-to-stg/T27704a/T27704a.stdout - + testsuite/tests/core-to-stg/T27704a/all.T - + testsuite/tests/core-to-stg/T27717/Callee.hs - + testsuite/tests/core-to-stg/T27717/Callee.hs-boot - + testsuite/tests/core-to-stg/T27717/Main.hs - + testsuite/tests/core-to-stg/T27717/Mid.hs - + testsuite/tests/core-to-stg/T27717/T27717.stdout - + testsuite/tests/core-to-stg/T27717/Ty.hs - + testsuite/tests/core-to-stg/T27717/all.T - testsuite/tests/core-to-stg/all.T - testsuite/tests/ffi/should_run/T21305.hs - − testsuite/tests/gadt/T14320.stderr - testsuite/tests/gadt/T18191.hs - testsuite/tests/gadt/T18191.stderr - + testsuite/tests/gadt/T27423a.hs - + testsuite/tests/gadt/T27423b.hs - + testsuite/tests/gadt/T27423b.stderr - testsuite/tests/gadt/all.T - + testsuite/tests/ghci.debugger/scripts/T27633c.hs - + testsuite/tests/ghci.debugger/scripts/T27633c.script - + testsuite/tests/ghci.debugger/scripts/T27633c.stdout - + testsuite/tests/ghci.debugger/scripts/T27633c_obj.hs - testsuite/tests/ghci.debugger/scripts/all.T - + testsuite/tests/ghci/prog-mhu007/Makefile - + testsuite/tests/ghci/prog-mhu007/a/A.hs - + testsuite/tests/ghci/prog-mhu007/all.T - + testsuite/tests/ghci/prog-mhu007/b/B.hs - + testsuite/tests/ghci/prog-mhu007/prog-mhu007.script - + testsuite/tests/ghci/prog-mhu007/prog-mhu007.stdout - + testsuite/tests/ghci/prog-mhu007/testpkg-bar/Bar.hs - + testsuite/tests/ghci/prog-mhu007/testpkg-bar/testpkg-bar.pkg - + testsuite/tests/ghci/prog-mhu007/testpkg-foo/Foo.hs - + testsuite/tests/ghci/prog-mhu007/testpkg-foo/testpkg-foo.pkg - + testsuite/tests/ghci/prog-mhu007/unitA - + testsuite/tests/ghci/prog-mhu007/unitB - + testsuite/tests/patsyn/should_compile/T27744.hs - testsuite/tests/patsyn/should_compile/all.T - testsuite/tests/perf/compiler/all.T - testsuite/tests/perf/compiler/large-project/all.T - testsuite/tests/perf/should_run/T3586.hs - testsuite/tests/perf/should_run/T3586.stdout - testsuite/tests/perf/space_leaks/all.T - + testsuite/tests/printer/Haddock1.hs - testsuite/tests/printer/Makefile - + testsuite/tests/printer/T27423c.hs - testsuite/tests/printer/all.T - testsuite/tests/rename/should_fail/RnStaticPointersFail01.stderr - testsuite/tests/rename/should_fail/RnStaticPointersFail03.stderr - testsuite/tests/rename/should_fail/T26545.stderr - + testsuite/tests/rts/T27477.hs - + testsuite/tests/rts/T27477.stdout - testsuite/tests/rts/all.T - testsuite/tests/simplCore/should_compile/T17966.stderr - + testsuite/tests/simplCore/should_compile/T27556.hs - + testsuite/tests/simplCore/should_compile/T27556.script - + testsuite/tests/simplCore/should_compile/T27749.hs - + testsuite/tests/simplCore/should_compile/T27749.stderr - testsuite/tests/simplCore/should_compile/T7785.stderr - testsuite/tests/simplCore/should_compile/all.T - testsuite/tests/simplCore/should_compile/spec004.hs - testsuite/tests/simplCore/should_compile/spec004.stderr - + testsuite/tests/simplCore/should_run/T27703/Lib.hs - + testsuite/tests/simplCore/should_run/T27703/Main.hs - + testsuite/tests/simplCore/should_run/T27703/T27703.stdout - + testsuite/tests/simplCore/should_run/T27703/all.T - + testsuite/tests/simplCore/should_run/T27705.hs - + testsuite/tests/simplCore/should_run/T27705.stdout - + testsuite/tests/simplCore/should_run/T27705_Inst.hs - testsuite/tests/simplCore/should_run/all.T - testsuite/tests/th/T17380.stderr - testsuite/tests/th/T18612.stderr - + testsuite/tests/th/T27034.hs - + testsuite/tests/th/T27034.stderr - testsuite/tests/th/T8761.stderr - testsuite/tests/th/all.T - + testsuite/tests/typecheck/should_compile/T27664.hs - testsuite/tests/typecheck/should_compile/all.T - + testsuite/tests/warnings/should_compile/T16836a.hs - + testsuite/tests/warnings/should_compile/T16836a.stderr - + testsuite/tests/warnings/should_compile/T16836b.hs - + testsuite/tests/warnings/should_compile/T16836c.hs - + testsuite/tests/warnings/should_compile/T16836c.stderr - + testsuite/tests/warnings/should_compile/T16836d.hs - + testsuite/tests/warnings/should_compile/T16836d.stderr - testsuite/tests/warnings/should_compile/all.T - utils/check-exact/ExactPrint.hs - utils/deriveConstants/Main.hs - utils/ghc-toolchain/src/GHC/Toolchain/Program.hs - utils/ghc-toolchain/src/GHC/Toolchain/Target.hs - utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/GhcUtils.hs - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs - utils/haddock/haddock-api/src/Haddock/Types.hs - utils/hsc2hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/4333746379de774b9727fdfea777ef… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/4333746379de774b9727fdfea777ef… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/sjakobi/T27732-type-data-field-annotations] Reject ~, UNPACK and multiplicity annotations on type data fields
by Simon Jakobi (＠sjakobi) 10 Sep '26

10 Sep '26

Simon Jakobi pushed to branch wip/sjakobi/T27732-type-data-field-annotations at Glasgow Haskell Compiler / GHC Commits: 36f0590c by Simon Jakobi at 2026-09-10T15:36:27+02:00 Reject ~, UNPACK and multiplicity annotations on type data fields Only `!` was rejected so far. `~`, UNPACK and multiplicity annotations were silently accepted. None of them make sense at the type level, so restriction (R3) of Note [Type data declarations] now covers all of them. Fixes #27732. Assisted-by: Claude Fable 5.1 - - - - - 19 changed files: - + changelog.d/27732 - compiler/GHC/Rename/Module.hs - compiler/GHC/Tc/Errors/Types.hs - docs/users_guide/exts/type_data.rst - + testsuite/tests/type-data/should_fail/T27732a.hs - + testsuite/tests/type-data/should_fail/T27732a.stderr - + testsuite/tests/type-data/should_fail/T27732b.hs - + testsuite/tests/type-data/should_fail/T27732b.stderr - + testsuite/tests/type-data/should_fail/T27732c.hs - + testsuite/tests/type-data/should_fail/T27732c.stderr - + testsuite/tests/type-data/should_fail/T27732d.hs - + testsuite/tests/type-data/should_fail/T27732d.stderr - + testsuite/tests/type-data/should_fail/T27732e.hs - + testsuite/tests/type-data/should_fail/T27732e.stderr - + testsuite/tests/type-data/should_fail/T27732f.hs - + testsuite/tests/type-data/should_fail/T27732f.stderr - testsuite/tests/type-data/should_fail/TDStrictnessGADT.stderr - testsuite/tests/type-data/should_fail/TDStrictnessH98.stderr - testsuite/tests/type-data/should_fail/all.T Changes: ===================================== changelog.d/27732 ===================================== @@ -0,0 +1,8 @@ +section: language +synopsis: Reject ``~``, ``UNPACK`` and multiplicity annotations on ``type data`` fields +description: + ``type data`` declarations (:extension:`TypeData`) now reject any + strictness, unpackedness or multiplicity annotation on constructor + fields. Previously only ``!`` was rejected. +mrs: !16563 +issues: #27732 ===================================== compiler/GHC/Rename/Module.hs ===================================== @@ -71,7 +71,6 @@ import GHC.Data.Graph.Directed ( SCC, flattenSCC, Node(..) , stronglyConnCompFromEdgedVerticesUniq ) import GHC.Data.OrdList import qualified GHC.LanguageExtensions as LangExt -import GHC.Core.DataCon ( isSrcStrict ) import Control.Monad import Data.Bifunctor ( first ) @@ -2116,8 +2115,8 @@ rnDataDefn doc (HsDataDefn { dd_cType = cType, dd_ctxt = context, dd_cons = cond = do { ; when (has_labelled_fields condecl) $ failWith $ TcRnTypeDataForbids TypeDataForbidsLabelledFields - ; when (has_strictness_flags condecl) $ - failWith $ TcRnTypeDataForbids TypeDataForbidsStrictnessAnnotations + ; when (has_field_annotations condecl) $ + failWith $ TcRnTypeDataForbids TypeDataForbidsFieldAnnotations } has_labelled_fields (ConDeclGADT { con_g_args = RecConGADT _ _ }) = True @@ -2125,13 +2124,19 @@ rnDataDefn doc (HsDataDefn { dd_cType = cType, dd_ctxt = context, dd_cons = cond = not (null (unLoc flds)) has_labelled_fields _ = False - has_strictness_flags condecl - = any isSrcStrict (con_arg_bangs condecl) + has_field_annotations condecl + = not (all unannotated (con_arg_fields condecl)) + where + unannotated (CDF { cdf_bang = NoSrcStrict + , cdf_unpack = NoSrcUnpack + , cdf_multiplicity = HsModifiedFunArr _ [] (HsStandardArr _) }) + = True + unannotated _ = False - con_arg_bangs (ConDeclGADT { con_g_args = PrefixConGADT _ args }) = map cdf_bang args - con_arg_bangs (ConDeclH98 { con_args = PrefixCon _ args }) = map cdf_bang args - con_arg_bangs (ConDeclH98 { con_args = InfixCon _ arg1 arg2 }) = [cdf_bang arg1, cdf_bang arg2] - con_arg_bangs _ = [] + con_arg_fields (ConDeclGADT { con_g_args = PrefixConGADT _ args }) = args + con_arg_fields (ConDeclH98 { con_args = PrefixCon _ args }) = args + con_arg_fields (ConDeclH98 { con_args = InfixCon _ arg1 arg2 }) = [arg1, arg2] + con_arg_fields _ = [] {- Note [Type data declarations] @@ -2166,8 +2171,9 @@ preceded by `type`, with the following restrictions: (R2) There are no labelled fields. Perhaps these could be supported using type families, but they are omitted for now. -(R3) There are no strictness flags, because they don't make sense at - the type level. +(R3) There are no strictness, unpackedness or multiplicity annotations + (!, ~, {-# UNPACK #-}, {-# NOUNPACK #-}, %m ->, ⊸), because they + don't make sense at the type level. (R4) The types of the constructors contain no constraints. ===================================== compiler/GHC/Tc/Errors/Types.hs ===================================== @@ -2865,6 +2865,12 @@ data TcRnMessage where type-data/should_fail/TDRecordsH98 type-data/should_fail/TDStrictnessGADT type-data/should_fail/TDStrictnessH98 + type-data/should_fail/T27732a + type-data/should_fail/T27732b + type-data/should_fail/T27732c + type-data/should_fail/T27732d + type-data/should_fail/T27732e + type-data/should_fail/T27732f -} TcRnTypeDataForbids :: !TypeDataForbids -> TcRnMessage @@ -4523,15 +4529,15 @@ data ZonkerMessage where data TypeDataForbids = TypeDataForbidsDatatypeContexts | TypeDataForbidsLabelledFields - | TypeDataForbidsStrictnessAnnotations + | TypeDataForbidsFieldAnnotations | TypeDataForbidsDerivingClauses deriving Generic instance Outputable TypeDataForbids where - ppr TypeDataForbidsDatatypeContexts = text "Data type contexts" - ppr TypeDataForbidsLabelledFields = text "Labelled fields" - ppr TypeDataForbidsStrictnessAnnotations = text "Strictness flags" - ppr TypeDataForbidsDerivingClauses = text "Deriving clauses" + ppr TypeDataForbidsDatatypeContexts = text "Data type contexts" + ppr TypeDataForbidsLabelledFields = text "Labelled fields" + ppr TypeDataForbidsFieldAnnotations = text "Strictness, unpackedness or multiplicity annotations" + ppr TypeDataForbidsDerivingClauses = text "Deriving clauses" -- | Specifies which back ends can handle a requested foreign import or export type ExpectedBackends = [Backend] ===================================== docs/users_guide/exts/type_data.rst ===================================== @@ -33,7 +33,8 @@ either an ordinary algebraic data type or a GADT, prefixed with the keyword ``type``, except that it may not contain a datatype context (even with :extension:`DatatypeContexts`), labelled fields, -strictness flags, or +:ref:`strictness <strict-haskell>`, :ref:`unpackedness <unpack-pragma>` or +:ref:`multiplicity <linear-types>` annotations, or a ``deriving`` clause. The only constraints permitted in the types of constructors are ===================================== testsuite/tests/type-data/should_fail/T27732a.hs ===================================== @@ -0,0 +1,4 @@ +{-# LANGUAGE TypeData, LazyFieldAnnotations #-} +module T27732a where + +type data T a = Cons ~a ===================================== testsuite/tests/type-data/should_fail/T27732a.stderr ===================================== @@ -0,0 +1,3 @@ +T27732a.hs:4:17: error: [GHC-67297] + Strictness, unpackedness or multiplicity annotations are not allowed in type data declarations. + ===================================== testsuite/tests/type-data/should_fail/T27732b.hs ===================================== @@ -0,0 +1,5 @@ +{-# LANGUAGE TypeData, LazyFieldAnnotations #-} +module T27732b where + +type data T a where + Cons :: ~a -> T a ===================================== testsuite/tests/type-data/should_fail/T27732b.stderr ===================================== @@ -0,0 +1,3 @@ +T27732b.hs:5:6: error: [GHC-67297] + Strictness, unpackedness or multiplicity annotations are not allowed in type data declarations. + ===================================== testsuite/tests/type-data/should_fail/T27732c.hs ===================================== @@ -0,0 +1,4 @@ +{-# LANGUAGE TypeData #-} +module T27732c where + +type data T a = Cons {-# UNPACK #-} a ===================================== testsuite/tests/type-data/should_fail/T27732c.stderr ===================================== @@ -0,0 +1,3 @@ +T27732c.hs:4:17: error: [GHC-67297] + Strictness, unpackedness or multiplicity annotations are not allowed in type data declarations. + ===================================== testsuite/tests/type-data/should_fail/T27732d.hs ===================================== @@ -0,0 +1,4 @@ +{-# LANGUAGE TypeData #-} +module T27732d where + +type data T a = Cons {-# NOUNPACK #-} a ===================================== testsuite/tests/type-data/should_fail/T27732d.stderr ===================================== @@ -0,0 +1,3 @@ +T27732d.hs:4:17: error: [GHC-67297] + Strictness, unpackedness or multiplicity annotations are not allowed in type data declarations. + ===================================== testsuite/tests/type-data/should_fail/T27732e.hs ===================================== @@ -0,0 +1,5 @@ +{-# LANGUAGE TypeData, LinearTypes #-} +module T27732e where + +type data T where + MkT :: Int %1 -> T ===================================== testsuite/tests/type-data/should_fail/T27732e.stderr ===================================== @@ -0,0 +1,3 @@ +T27732e.hs:5:3: error: [GHC-67297] + Strictness, unpackedness or multiplicity annotations are not allowed in type data declarations. + ===================================== testsuite/tests/type-data/should_fail/T27732f.hs ===================================== @@ -0,0 +1,5 @@ +{-# LANGUAGE TypeData, LinearTypes, UnicodeSyntax #-} +module T27732f where + +type data T where + MkT :: Int ⊸ T ===================================== testsuite/tests/type-data/should_fail/T27732f.stderr ===================================== @@ -0,0 +1,3 @@ +T27732f.hs:5:3: error: [GHC-67297] + Strictness, unpackedness or multiplicity annotations are not allowed in type data declarations. + ===================================== testsuite/tests/type-data/should_fail/TDStrictnessGADT.stderr ===================================== @@ -1,3 +1,3 @@ +TDStrictnessGADT.hs:5:6: error: [GHC-67297] + Strictness, unpackedness or multiplicity annotations are not allowed in type data declarations. -TDStrictnessGADT.hs:5:6: [GHC-67297] - Strictness flags are not allowed in type data declarations. ===================================== testsuite/tests/type-data/should_fail/TDStrictnessH98.stderr ===================================== @@ -1,3 +1,3 @@ +TDStrictnessH98.hs:4:17: error: [GHC-67297] + Strictness, unpackedness or multiplicity annotations are not allowed in type data declarations. -TDStrictnessH98.hs:4:17: [GHC-67297] - Strictness flags are not allowed in type data declarations. ===================================== testsuite/tests/type-data/should_fail/all.T ===================================== @@ -13,3 +13,9 @@ test('TDStrictnessGADT', normal, compile_fail, ['']) test('TDStrictnessH98', normal, compile_fail, ['']) test('TDTagToEnum', normal, compile_fail, ['']) test('T22332b', normal, compile_fail, ['']) +test('T27732a', normal, compile_fail, ['']) +test('T27732b', normal, compile_fail, ['']) +test('T27732c', normal, compile_fail, ['']) +test('T27732d', normal, compile_fail, ['']) +test('T27732e', normal, compile_fail, ['']) +test('T27732f', normal, compile_fail, ['']) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/36f0590c2d8f1949f394b8988502768… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/36f0590c2d8f1949f394b8988502768… You're receiving this email because of your account on gitlab.haskell.org. 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