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[Git][ghc/ghc][wip/dcoutts/issue-27105-stopTicker-2] 7 commits: Promote HAVE_PREEMPTION from Timer.c to OSThreads.h
by Duncan Coutts (＠dcoutts) 08 Jun '26

08 Jun '26

Duncan Coutts pushed to branch wip/dcoutts/issue-27105-stopTicker-2 at Glasgow Haskell Compiler / GHC Commits: c5f03b4e by Duncan Coutts at 2026-06-08T10:19:39+02:00 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). - - - - - 3e0fbc85 by Duncan Coutts at 2026-06-08T10:19:49+02:00 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. - - - - - d6d2f4f3 by Duncan Coutts at 2026-06-08T10:19:49+02:00 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. - - - - - f7286545 by Duncan Coutts at 2026-06-08T10:19:49+02:00 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(). - - - - - 21911f5e by Duncan Coutts at 2026-06-08T10:23:17+02:00 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. - - - - - f240aa83 by Duncan Coutts at 2026-06-08T10:23:20+02:00 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! - - - - - 7d07b187 by Duncan Coutts at 2026-06-08T10:23:20+02:00 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. - - - - - 6 changed files: - rts/Capability.c - rts/Schedule.c - rts/Timer.c - rts/eventlog/EventLog.c - rts/eventlog/EventLog.h - rts/include/rts/OSThreads.h Changes: ===================================== rts/Capability.c ===================================== @@ -443,13 +443,6 @@ void moreCapabilities (uint32_t from USED_IF_THREADS, uint32_t to USED_IF_THREADS) { #if defined(THREADED_RTS) - // 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. The alternative would be to protect the capabilities - // array with a lock but this seems more expensive than necessary. - // See #17289. - stopTimer(); - if (to == 1) { // THREADED_RTS must work on builds that don't have a mutable // BaseReg (eg. unregisterised), so in this case @@ -470,8 +463,6 @@ moreCapabilities (uint32_t from USED_IF_THREADS, uint32_t to USED_IF_THREADS) } debugTrace(DEBUG_sched, "allocated %d more capabilities", to - from); - - startTimer(); #endif } ===================================== rts/Schedule.c ===================================== @@ -37,6 +37,7 @@ #include "win32/AsyncWinIO.h" #endif #include "Trace.h" +#include "eventlog/EventLog.h" #include "RaiseAsync.h" #include "Threads.h" #include "Timer.h" @@ -2100,24 +2101,31 @@ forkProcess(HsStablePtr *entry ACQUIRE_LOCK(&all_tasks_mutex); #endif - stopTimer(); // See #4074 - #if defined(TRACING) - flushAllCapsEventsBufs(); // so that child won't inherit dirty file buffers +#if defined(HAVE_PREEMPTION) + // We must hold the eventlog global mutex over the fork to prevent the + // timer thread from trying to post events. While holding the mutex we need + // to flush the eventlogs (global and per-cap) so that child won't inherit + // dirty eventlog buffers or file buffers. + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); +#endif + flushAllCapsEventsBufs_(); #endif pid = fork(); if (pid) { // parent - startTimer(); // #4074 - RELEASE_LOCK(&sched_mutex); RELEASE_LOCK(&sm_mutex); RELEASE_LOCK(&stable_ptr_mutex); RELEASE_LOCK(&stable_name_mutex); RELEASE_LOCK(&task->lock); +#if defined(TRACING) && defined(HAVE_PREEMPTION) + RELEASE_LOCK_ALWAYS(&eventBufMutex); +#endif + #if defined(THREADED_RTS) /* N.B. releaseCapability_ below may need to take all_tasks_mutex */ RELEASE_LOCK(&all_tasks_mutex); @@ -2303,12 +2311,6 @@ setNumCapabilities (uint32_t new_n_capabilities USED_IF_THREADS) cap = rts_lock(); task = cap->running_task; - - // N.B. 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. - stopTimer(); - stopAllCapabilities(&cap, task); if (new_n_capabilities < enabled_capabilities) @@ -2364,9 +2366,7 @@ setNumCapabilities (uint32_t new_n_capabilities USED_IF_THREADS) tracingAddCapabilities(n_capabilities, new_n_capabilities); #endif - // Resize the capabilities array - // NB. after this, capabilities points somewhere new. Any pointers - // of type (Capability *) are now invalid. + // Allocate and initialise the extra capabilities moreCapabilities(n_capabilities, new_n_capabilities); // Resize and update storage manager data structures @@ -2394,8 +2394,6 @@ setNumCapabilities (uint32_t new_n_capabilities USED_IF_THREADS) // Notify IO manager that the number of capabilities has changed. notifyIOManagerCapabilitiesChanged(&cap); - startTimer(); - rts_unlock(cap); #endif // THREADED_RTS ===================================== rts/Timer.c ===================================== @@ -28,11 +28,6 @@ #include "RtsSignals.h" #include "rts/EventLogWriter.h" -// See Note [No timer on wasm32] -#if !defined(wasm32_HOST_ARCH) -#define HAVE_PREEMPTION -#endif - // This global counter is used to allow multiple threads to stop the // timer temporarily with a stopTimer()/startTimer() pair. If // timer_enabled == 0 timer is enabled ===================================== rts/eventlog/EventLog.c ===================================== @@ -129,8 +129,11 @@ typedef struct _EventsBuf { static EventsBuf *capEventBuf; // one EventsBuf for each Capability static EventsBuf eventBuf; // an EventsBuf not associated with any Capability -#if defined(THREADED_RTS) -static Mutex eventBufMutex; // protected by this mutex +#if defined(HAVE_PREEMPTION) +// Note that this mutex is used even in the non-threaded RTS, since the timer +// thread posts events and flushes. So _all_ uses of this mutex must use +// ACQUIRE_LOCK_ALWAYS/RELEASE_LOCK_ALWAYS. +Mutex eventBufMutex; // protects eventBuf above #endif // Event type @@ -393,8 +396,10 @@ initEventLogging(void) moreCapEventBufs(0, get_n_capabilities()); initEventsBuf(&eventBuf, EVENT_LOG_SIZE, (EventCapNo)(-1)); -#if defined(THREADED_RTS) +#if defined(HAVE_PREEMPTION) initMutex(&eventBufMutex); +#endif +#if defined(THREADED_RTS) initMutex(&state_change_mutex); #endif } @@ -416,7 +421,7 @@ startEventLogging_(void) { initEventLogWriter(); - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); postHeaderEvents(); /* @@ -425,7 +430,7 @@ startEventLogging_(void) */ printAndClearEventBuf(&eventBuf); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); return true; } @@ -495,7 +500,7 @@ endEventLogging(void) flushEventLog_(NULL); - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); // Mark end of events (data). postEventTypeNum(&eventBuf, EVENT_DATA_END); @@ -503,7 +508,7 @@ endEventLogging(void) // Flush the end of data marker. printAndClearEventBuf(&eventBuf); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); stopEventLogWriter(); event_log_writer = NULL; @@ -666,7 +671,7 @@ void postCapEvent (EventTypeNum tag, EventCapNo capno) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); ensureRoomForEvent(&eventBuf, tag); postEventHeader(&eventBuf, tag); @@ -685,14 +690,14 @@ postCapEvent (EventTypeNum tag, barf("postCapEvent: unknown event tag %d", tag); } - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postCapsetEvent (EventTypeNum tag, EventCapsetID capset, StgWord info) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); ensureRoomForEvent(&eventBuf, tag); postEventHeader(&eventBuf, tag); @@ -726,7 +731,7 @@ void postCapsetEvent (EventTypeNum tag, barf("postCapsetEvent: unknown event tag %d", tag); } - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postCapsetStrEvent (EventTypeNum tag, @@ -740,14 +745,14 @@ void postCapsetStrEvent (EventTypeNum tag, return; } - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); if (!hasRoomForVariableEvent(&eventBuf, size)){ printAndClearEventBuf(&eventBuf); if (!hasRoomForVariableEvent(&eventBuf, size)){ errorBelch("Event size exceeds buffer size, bail out"); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); return; } } @@ -758,7 +763,7 @@ void postCapsetStrEvent (EventTypeNum tag, postBuf(&eventBuf, (StgWord8*) msg, strsize); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postCapsetVecEvent (EventTypeNum tag, @@ -783,14 +788,14 @@ void postCapsetVecEvent (EventTypeNum tag, } } - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); if (!hasRoomForVariableEvent(&eventBuf, size)){ printAndClearEventBuf(&eventBuf); if(!hasRoomForVariableEvent(&eventBuf, size)){ errorBelch("Event size exceeds buffer size, bail out"); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); return; } } @@ -804,7 +809,7 @@ void postCapsetVecEvent (EventTypeNum tag, postBuf(&eventBuf, (StgWord8*) argv[i], 1 + strlen(argv[i])); } - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postWallClockTime (EventCapsetID capset) @@ -813,7 +818,7 @@ void postWallClockTime (EventCapsetID capset) StgWord64 sec; StgWord32 nsec; - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); /* The EVENT_WALL_CLOCK_TIME event is intended to allow programs reading the eventlog to match up the event timestamps with wall @@ -846,7 +851,7 @@ void postWallClockTime (EventCapsetID capset) postWord64(&eventBuf, sec); postWord32(&eventBuf, nsec); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } /* @@ -885,7 +890,7 @@ void postEventHeapInfo (EventCapsetID heap_capset, W_ mblockSize, W_ blockSize) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); ensureRoomForEvent(&eventBuf, EVENT_HEAP_INFO_GHC); postEventHeader(&eventBuf, EVENT_HEAP_INFO_GHC); @@ -899,7 +904,7 @@ void postEventHeapInfo (EventCapsetID heap_capset, postWord64(&eventBuf, mblockSize); postWord64(&eventBuf, blockSize); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postEventGcStats (Capability *cap, @@ -952,7 +957,7 @@ void postTaskCreateEvent (EventTaskId taskId, EventCapNo capno, EventKernelThreadId tid) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); ensureRoomForEvent(&eventBuf, EVENT_TASK_CREATE); postEventHeader(&eventBuf, EVENT_TASK_CREATE); @@ -961,14 +966,14 @@ void postTaskCreateEvent (EventTaskId taskId, postCapNo(&eventBuf, capno); postKernelThreadId(&eventBuf, tid); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postTaskMigrateEvent (EventTaskId taskId, EventCapNo capno, EventCapNo new_capno) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); ensureRoomForEvent(&eventBuf, EVENT_TASK_MIGRATE); postEventHeader(&eventBuf, EVENT_TASK_MIGRATE); @@ -977,28 +982,28 @@ void postTaskMigrateEvent (EventTaskId taskId, postCapNo(&eventBuf, capno); postCapNo(&eventBuf, new_capno); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postTaskDeleteEvent (EventTaskId taskId) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); ensureRoomForEvent(&eventBuf, EVENT_TASK_DELETE); postEventHeader(&eventBuf, EVENT_TASK_DELETE); /* EVENT_TASK_DELETE (taskID) */ postTaskId(&eventBuf, taskId); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postEventNoCap (EventTypeNum tag) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); ensureRoomForEvent(&eventBuf, tag); postEventHeader(&eventBuf, tag); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void @@ -1042,9 +1047,9 @@ void postLogMsg(EventsBuf *eb, EventTypeNum type, char *msg, va_list ap) void postMsg(char *msg, va_list ap) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); postLogMsg(&eventBuf, EVENT_LOG_MSG, msg, ap); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postCapMsg(Capability *cap, char *msg, va_list ap) @@ -1138,32 +1143,32 @@ void postConcUpdRemSetFlush(Capability *cap) void postConcMarkEnd(StgWord32 marked_obj_count) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); ensureRoomForEvent(&eventBuf, EVENT_CONC_MARK_END); postEventHeader(&eventBuf, EVENT_CONC_MARK_END); postWord32(&eventBuf, marked_obj_count); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postNonmovingHeapCensus(uint16_t blk_size, const struct NonmovingAllocCensus *census) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); postEventHeader(&eventBuf, EVENT_NONMOVING_HEAP_CENSUS); postWord16(&eventBuf, blk_size); postWord32(&eventBuf, census->n_active_segs); postWord32(&eventBuf, census->n_filled_segs); postWord32(&eventBuf, census->n_live_blocks); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postNonmovingPrunedSegments(uint32_t pruned_segments, uint32_t free_segments) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); postEventHeader(&eventBuf, EVENT_NONMOVING_PRUNED_SEGMENTS); postWord32(&eventBuf, pruned_segments); postWord32(&eventBuf, free_segments); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void closeBlockMarker (EventsBuf *ebuf) @@ -1224,7 +1229,7 @@ static HeapProfBreakdown getHeapProfBreakdown(void) void postHeapProfBegin(void) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); PROFILING_FLAGS *flags = &RtsFlags.ProfFlags; StgWord modSelector_len = flags->modSelector ? strlen(flags->modSelector) : 0; @@ -1258,42 +1263,42 @@ void postHeapProfBegin(void) postStringLen(&eventBuf, flags->ccsSelector, ccsSelector_len); postStringLen(&eventBuf, flags->retainerSelector, retainerSelector_len); postStringLen(&eventBuf, flags->bioSelector, bioSelector_len); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postHeapProfSampleBegin(StgInt era) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); ensureRoomForEvent(&eventBuf, EVENT_HEAP_PROF_SAMPLE_BEGIN); postEventHeader(&eventBuf, EVENT_HEAP_PROF_SAMPLE_BEGIN); postWord64(&eventBuf, era); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postHeapBioProfSampleBegin(StgInt era, StgWord64 time) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); ensureRoomForEvent(&eventBuf, EVENT_HEAP_BIO_PROF_SAMPLE_BEGIN); postEventHeader(&eventBuf, EVENT_HEAP_BIO_PROF_SAMPLE_BEGIN); postWord64(&eventBuf, era); postWord64(&eventBuf, time); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postHeapProfSampleEnd(StgInt era) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); ensureRoomForEvent(&eventBuf, EVENT_HEAP_PROF_SAMPLE_END); postEventHeader(&eventBuf, EVENT_HEAP_PROF_SAMPLE_END); postWord64(&eventBuf, era); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postHeapProfSampleString(const char *label, StgWord64 residency) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); StgWord label_len = strlen(label); StgWord len = 1+8+label_len+1; CHECK(!ensureRoomForVariableEvent(&eventBuf, len)); @@ -1303,7 +1308,7 @@ void postHeapProfSampleString(const char *label, postWord8(&eventBuf, 0); postWord64(&eventBuf, residency); postStringLen(&eventBuf, label, label_len); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } #if defined(PROFILING) @@ -1313,7 +1318,7 @@ void postHeapProfCostCentre(StgWord32 ccID, const char *srcloc, StgBool is_caf) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); StgWord label_len = strlen(label); StgWord module_len = strlen(module); StgWord srcloc_len = strlen(srcloc); @@ -1326,13 +1331,13 @@ void postHeapProfCostCentre(StgWord32 ccID, postStringLen(&eventBuf, module, module_len); postStringLen(&eventBuf, srcloc, srcloc_len); postWord8(&eventBuf, is_caf); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void postHeapProfSampleCostCentre(CostCentreStack *stack, StgWord64 residency) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); StgWord depth = 0; CostCentreStack *ccs; for (ccs = stack; ccs != NULL && ccs != CCS_MAIN; ccs = ccs->prevStack) @@ -1351,7 +1356,7 @@ void postHeapProfSampleCostCentre(CostCentreStack *stack, depth>0 && ccs != NULL && ccs != CCS_MAIN; ccs = ccs->prevStack, depth--) postWord32(&eventBuf, ccs->cc->ccID); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } @@ -1359,7 +1364,7 @@ void postProfSampleCostCentre(Capability *cap, CostCentreStack *stack, StgWord64 tick) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); StgWord depth = 0; CostCentreStack *ccs; for (ccs = stack; ccs != NULL && ccs != CCS_MAIN; ccs = ccs->prevStack) @@ -1377,7 +1382,7 @@ void postProfSampleCostCentre(Capability *cap, depth>0 && ccs != NULL && ccs != CCS_MAIN; ccs = ccs->prevStack, depth--) postWord32(&eventBuf, ccs->cc->ccID); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } // This event is output at the start of profiling so the tick interval can @@ -1385,11 +1390,11 @@ void postProfSampleCostCentre(Capability *cap, // can be calculated from how many samples there are. void postProfBegin(void) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); postEventHeader(&eventBuf, EVENT_PROF_BEGIN); // The interval that each tick was sampled, in nanoseconds postWord64(&eventBuf, TimeToNS(RtsFlags.MiscFlags.tickInterval)); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } #endif /* PROFILING */ @@ -1415,11 +1420,11 @@ static void postTickyCounterDef(EventsBuf *eb, StgEntCounter *p) void postTickyCounterDefs(StgEntCounter *counters) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); for (StgEntCounter *p = counters; p != NULL; p = p->link) { postTickyCounterDef(&eventBuf, p); } - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } static void postTickyCounterSample(EventsBuf *eb, StgEntCounter *p) @@ -1443,13 +1448,13 @@ static void postTickyCounterSample(EventsBuf *eb, StgEntCounter *p) void postTickyCounterSamples(StgEntCounter *counters) { - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); ensureRoomForEvent(&eventBuf, EVENT_TICKY_COUNTER_SAMPLE); postEventHeader(&eventBuf, EVENT_TICKY_COUNTER_BEGIN_SAMPLE); for (StgEntCounter *p = counters; p != NULL; p = p->link) { postTickyCounterSample(&eventBuf, p); } - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } #endif /* TICKY_TICKY */ void postIPE(const InfoProvEnt *ipe) @@ -1459,7 +1464,7 @@ void postIPE(const InfoProvEnt *ipe) // See Note [Maximum event length]. const StgWord MAX_IPE_STRING_LEN = 65535; - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); StgWord table_name_len = MIN(strlen(ipe->prov.table_name), MAX_IPE_STRING_LEN); StgWord closure_desc_len = MIN(strlen(closure_desc_buf), MAX_IPE_STRING_LEN); StgWord ty_desc_len = MIN(strlen(ipe->prov.ty_desc), MAX_IPE_STRING_LEN); @@ -1489,7 +1494,7 @@ void postIPE(const InfoProvEnt *ipe) postBuf(&eventBuf, &colon, 1); postStringLen(&eventBuf, ipe->prov.src_span, src_span_len); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); } void printAndClearEventBuf (EventsBuf *ebuf) @@ -1601,14 +1606,21 @@ void flushLocalEventsBuf(Capability *cap) // Flush all capabilities' event buffers when we already hold all capabilities. // Used during forkProcess. void flushAllCapsEventsBufs(void) +{ + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); + flushAllCapsEventsBufs_(); + RELEASE_LOCK_ALWAYS(&eventBufMutex); +} + +// Unsafe version that does not acquire/release eventBufMutex. You must +// hold the eventBufMutex, which you must acquire with ACQUIRE_LOCK_ALWAYS! +void flushAllCapsEventsBufs_(void) { if (!event_log_writer) { return; } - ACQUIRE_LOCK(&eventBufMutex); printAndClearEventBuf(&eventBuf); - RELEASE_LOCK(&eventBufMutex); for (unsigned int i=0; i < getNumCapabilities(); i++) { flushLocalEventsBuf(getCapability(i)); @@ -1641,9 +1653,9 @@ static void flushEventLog_(Capability **cap USED_IF_THREADS) return; } - ACQUIRE_LOCK(&eventBufMutex); + ACQUIRE_LOCK_ALWAYS(&eventBufMutex); printAndClearEventBuf(&eventBuf); - RELEASE_LOCK(&eventBufMutex); + RELEASE_LOCK_ALWAYS(&eventBufMutex); #if defined(THREADED_RTS) Task *task = newBoundTask(); ===================================== rts/eventlog/EventLog.h ===================================== @@ -18,6 +18,13 @@ #if defined(TRACING) extern bool eventlog_enabled; +#if defined(HAVE_PREEMPTION) +// Avoid using this mutex directly if at all possible. It is needed in the +// implementation of forkProcess. +// +// All uses of this mutex must use ACQUIRE_LOCK_ALWAYS/RELEASE_LOCK_ALWAYS. +extern Mutex eventBufMutex; +#endif void initEventLogging(void); void restartEventLogging(void); @@ -27,6 +34,7 @@ void abortEventLogging(void); // #4512 - after fork child needs to abort void moreCapEventBufs (uint32_t from, uint32_t to); void flushLocalEventsBuf(Capability *cap); void flushAllCapsEventsBufs(void); +void flushAllCapsEventsBufs_(void); void flushAllEventsBufs(Capability *cap); typedef void (*EventlogInitPost)(void); ===================================== rts/include/rts/OSThreads.h ===================================== @@ -14,6 +14,44 @@ #pragma once +/* Note [Threads and preemption] + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + All full-fat OSs that GHC works on have OS threads, and we use them even in + the non-threaded RTS for a few features: + * Haskell thread preemption; + * sample-based profiling; + * idle GC; + * periodic eventlog flushing. + + We use defined(HAVE_PREEMPTION) to decide if these features are implemented + via OS threads. + + On platforms like WASM/js we do not have OS threads in any conventional + sense, and the features above are either not available or are implemented + differently. See Note [No timer on wasm32]. + + In future if GHC is ported to platforms like bare-metal micro-controllers, + RTOSs or to run directly under hypervisors then such platforms may also not + have threads available and they should not define HAVE_PREEMPTION here. Or + for some micro-controller RTOSs like Zeypher one may have a choice about + whether to use threads or not (at a size cost). Here would be the right + place to control whether the feature list above is supported. + */ +#if defined(wasm32_HOST_ARCH) + // See Note [No timer on wasm32] + // To confuse matters, WASM _does_ have pthread.h but it doesnt work. +#elif defined(HAVE_PTHREAD_H) || defined(HAVE_WINDOWS_H) +#define HAVE_PREEMPTION +#else +#error Decide if this platform has threads and pre-emption or not. +#endif +// And JS does all of this differently, without using this bit of the RTS. + +// Configuration sanity check +#if defined(THREADED_RTS) && !defined(HAVE_PREEMPTION) +#error Configuration error: THREADED_RTS should imply HAVE_PREEMPTION +#endif + #if defined(HAVE_PTHREAD_H) && !defined(mingw32_HOST_OS) #if defined(CMINUSMINUS) @@ -210,9 +248,29 @@ extern bool timedWaitCondition ( Condition* pCond, Mutex* pMut, Time timeout) // // Mutexes // +// Even in the non-threaded RTS we use threads and mutexes! In particular the +// timer/ticker is implemented using a thread. And using threads needs locks. +// In particular we need locks for the data shared between the timer/ticker +// thread and the thread running the main capability. +#if defined(HAVE_PREEMPTION) extern void initMutex ( Mutex* pMut ); extern void closeMutex ( Mutex* pMut ); +// The "always" variants do locking in the threaded and non-threaded RTS. +// The normal variants below are no-ops in the non-threaded RTS. +#define ACQUIRE_LOCK_ALWAYS(l) OS_ACQUIRE_LOCK(l) +#define TRY_ACQUIRE_LOCK_ALWAYS(l) OS_TRY_ACQUIRE_LOCK(l) +#define RELEASE_LOCK_ALWAYS(l) OS_RELEASE_LOCK(l) +#define ASSERT_LOCK_HELD_ALWAYS(l) OS_ASSERT_LOCK_HELD(l) +#else +// And just to be a bit confusing, the always variants are still no-ops when we +// do not HAVE_PREEMPTION, since then we don't have threads or mutexes at all. +#define ACQUIRE_LOCK_ALWAYS(l) +#define TRY_ACQUIRE_LOCK_ALWAYS(l) 0 +#define RELEASE_LOCK_ALWAYS(l) +#define ASSERT_LOCK_HELD_ALWAYS(l) +#endif + // Processors and affinity void setThreadAffinity (uint32_t n, uint32_t m); void setThreadNode (uint32_t node); @@ -228,6 +286,7 @@ void releaseThreadNode (void); #else +// No-ops in the non-threaded RTS. See also the _ALWAYS variants above. #define ACQUIRE_LOCK(l) #define TRY_ACQUIRE_LOCK(l) 0 #define RELEASE_LOCK(l) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/e2c8b1088a9ff2e6cc597f7dff930b… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/e2c8b1088a9ff2e6cc597f7dff930b… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/romes/hadrian-cross-stage2-rebase_SVEN_FINAL] testsuite: add GHC build-system regression detection tests
by Sven Tennie (＠supersven) 08 Jun '26

08 Jun '26

Sven Tennie pushed to branch wip/romes/hadrian-cross-stage2-rebase_SVEN_FINAL at Glasgow Haskell Compiler / GHC Commits: f0e5999e by Sven Tennie at 2026-06-08T10:14:59+02:00 testsuite: add GHC build-system regression detection tests Pin arch-specific GHC config values so that build-system refactors that accidentally change compiler configuration are caught by the testsuite. Two tests: - GhcInfoPins: runs ghc --info and checks 18 pinned fields - TestsuiteConfigPins: checks 12 Hadrian-supplied config.* values Both tests print a ready-to-paste entry when run on an unknown platform. Tests are Python run_command (not compiled Haskell) because wasm32/WASI targets cannot call runInteractiveProcess from compiled binaries. - - - - - 4 changed files: - + testsuite/tests/driver/config-pins/ConfigPinsExpected.py - + testsuite/tests/driver/config-pins/GhcInfoPins.py - + testsuite/tests/driver/config-pins/TestsuiteConfigPins.py - + testsuite/tests/driver/config-pins/all.T Changes: ===================================== testsuite/tests/driver/config-pins/ConfigPinsExpected.py ===================================== @@ -0,0 +1,653 @@ +# Expected GHC config values, keyed by platform key. +# +# Platform key construction: +# base = "target platform string" from ghc --info (or config.platform) +# key = base +# + ("-cross" if cross-compiling) +# + ("-unreg" if Unregisterised, +# "-no_tntc" elif Tables-next-to-code == NO) +# +# When a new platform is encountered the test prints a ready-to-paste entry. + + +def platform_key(platform, is_cross, is_unreg, no_tntc): + key = platform + if is_cross: key += "-cross" + if is_unreg: key += "-unreg" + elif no_tntc: key += "-no_tntc" + return key + +PINNED_GHC_INFO_FIELDS = [ + "target arch", + "target os", + "target platform string", + "target word size", + "target word big endian", + "Tables next to code", + "Support SMP", + "Have interpreter", + "Use interpreter", + "Have native code generator", + "Unregisterised", + "Leading underscore", + "target has RTS linker", + "target RTS linker only supports shared libraries", + "cross compiling", + "target has GNU nonexec stack", + "target has subsections via symbols", + "Target default backend", +] + +GHC_INFO_EXPECTED = { + + # ── x86_64 Linux (all distros) ─────────────────────────────────────────── + "x86_64-unknown-linux": { + "target arch": "ArchX86_64", + "target os": "OSLinux", + "target platform string": "x86_64-unknown-linux", + "target word size": "8", + "target word big endian": "NO", + "Tables next to code": "YES", + "Support SMP": "YES", + "Have interpreter": "YES", + "Use interpreter": "YES", + "Have native code generator": "YES", + "Unregisterised": "NO", + "Leading underscore": "NO", + "target has RTS linker": "YES", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "NO", + "target has GNU nonexec stack": "YES", + "target has subsections via symbols": "NO", + "Target default backend": "native code generator", + }, + + # ── x86_64 Linux unregisterised ────────────────────────────────────────── + "x86_64-unknown-linux-unreg": { + "target arch": "ArchX86_64", + "target os": "OSLinux", + "target platform string": "x86_64-unknown-linux", + "target word size": "8", + "target word big endian": "NO", + "Tables next to code": "NO", + "Support SMP": "NO", + "Have interpreter": "YES", + "Use interpreter": "YES", + "Have native code generator": "NO", + "Unregisterised": "YES", + "Leading underscore": "NO", + "target has RTS linker": "YES", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "NO", + "target has GNU nonexec stack": "YES", + "target has subsections via symbols": "NO", + "Target default backend": "compiling via C", + }, + + # ── x86_64 Linux no tables-next-to-code ────────────────────────────────── + "x86_64-unknown-linux-no_tntc": { + "target arch": "ArchX86_64", + "target os": "OSLinux", + "target platform string": "x86_64-unknown-linux", + "target word size": "8", + "target word big endian": "NO", + "Tables next to code": "NO", + "Support SMP": "YES", + "Have interpreter": "YES", + "Use interpreter": "YES", + "Have native code generator": "YES", + "Unregisterised": "NO", + "Leading underscore": "NO", + "target has RTS linker": "YES", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "NO", + "target has GNU nonexec stack": "YES", + "target has subsections via symbols": "NO", + "Target default backend": "native code generator", + }, + + # ── aarch64 Linux native ───────────────────────────────────────────────── + "aarch64-unknown-linux": { + "target arch": "ArchAArch64", + "target os": "OSLinux", + "target platform string": "aarch64-unknown-linux", + "target word size": "8", + "target word big endian": "NO", + "Tables next to code": "YES", + "Support SMP": "YES", + "Have interpreter": "YES", + "Use interpreter": "YES", + "Have native code generator": "YES", + "Unregisterised": "NO", + "Leading underscore": "NO", + "target has RTS linker": "YES", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "NO", + "target has GNU nonexec stack": "YES", + "target has subsections via symbols": "NO", + "Target default backend": "native code generator", + }, + + # ── aarch64 Linux cross ────────────────────────────────────────────────── + "aarch64-unknown-linux-cross": { + "target arch": "ArchAarch64", + "target os": "OSLinux", + "target platform string": "aarch64-unknown-linux", + "target word size": "8", + "target word big endian": "NO", + "Tables next to code": "YES", + "Support SMP": "YES", + "Have interpreter": "NO", + "Use interpreter": "NO", + "Have native code generator": "YES", + "Unregisterised": "NO", + "Leading underscore": "NO", + "target has RTS linker": "YES", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "YES", + "target has GNU nonexec stack": "YES", + "target has subsections via symbols": "NO", + "Target default backend": "native code generator", + }, + + # ── i386 Linux ─────────────────────────────────────────────────────────── + "i386-unknown-linux": { + "target arch": "ArchX86", + "target os": "OSLinux", + "target platform string": "i386-unknown-linux", + "target word size": "4", + "target word big endian": "NO", + "Tables next to code": "YES", + "Support SMP": "YES", + "Have interpreter": "YES", + "Use interpreter": "YES", + "Have native code generator": "YES", + "Unregisterised": "NO", + "Leading underscore": "NO", + "target has RTS linker": "YES", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "NO", + "target has GNU nonexec stack": "YES", + "target has subsections via symbols": "NO", + "Target default backend": "native code generator", + }, + + # ── aarch64 macOS ──────────────────────────────────────────────────────── + "aarch64-apple-darwin": { + "target arch": "ArchAArch64", + "target os": "OSDarwin", + "target platform string": "aarch64-apple-darwin", + "target word size": "8", + "target word big endian": "NO", + "Tables next to code": "YES", + "Support SMP": "YES", + "Have interpreter": "YES", + "Use interpreter": "YES", + "Have native code generator": "YES", + "Unregisterised": "NO", + "Leading underscore": "YES", + "target has RTS linker": "YES", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "NO", + "target has GNU nonexec stack": "NO", + "target has subsections via symbols": "NO", + "Target default backend": "native code generator", + }, + + # ── x86_64 macOS ───────────────────────────────────────────────────────── + "x86_64-apple-darwin": { + "target arch": "ArchX86_64", + "target os": "OSDarwin", + "target platform string": "x86_64-apple-darwin", + "target word size": "8", + "target word big endian": "NO", + "Tables next to code": "YES", + "Support SMP": "YES", + "Have interpreter": "YES", + "Use interpreter": "YES", + "Have native code generator": "YES", + "Unregisterised": "NO", + "Leading underscore": "YES", + "target has RTS linker": "YES", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "NO", + "target has GNU nonexec stack": "NO", + "target has subsections via symbols": "YES", + "Target default backend": "native code generator", + }, + + # ── x86_64 FreeBSD ─────────────────────────────────────────────────────── + "x86_64-portbld-freebsd": { + "target arch": "ArchX86_64", + "target os": "OSFreeBSD", + "target platform string": "x86_64-portbld-freebsd", + "target word size": "8", + "target word big endian": "NO", + "Tables next to code": "YES", + "Support SMP": "YES", + "Have interpreter": "YES", + "Use interpreter": "YES", + "Have native code generator": "YES", + "Unregisterised": "NO", + "Leading underscore": "NO", + "target has RTS linker": "YES", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "NO", + "target has GNU nonexec stack": "YES", + "target has subsections via symbols": "NO", + "Target default backend": "native code generator", + }, + + # ── x86_64 Windows native ──────────────────────────────────────────────── + "x86_64-unknown-mingw32": { + "target arch": "ArchX86_64", + "target os": "OSMinGW32", + "target platform string": "x86_64-unknown-mingw32", + "target word size": "8", + "target word big endian": "NO", + "Tables next to code": "YES", + "Support SMP": "YES", + "Have interpreter": "YES", + "Use interpreter": "YES", + "Have native code generator": "YES", + "Unregisterised": "NO", + "Leading underscore": "NO", + "target has RTS linker": "YES", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "NO", + "target has GNU nonexec stack": "NO", + "target has subsections via symbols": "NO", + "Target default backend": "native code generator", + }, + + # ── aarch64 Windows cross ──────────────────────────────────────────────── + "aarch64-unknown-mingw32-cross": { + "target arch": "ArchAarch64", + "target os": "OSMinGW32", + "target platform string": "aarch64-unknown-mingw32", + "target word size": "8", + "target word big endian": "NO", + "Tables next to code": "YES", + "Support SMP": "YES", + "Have interpreter": "NO", + "Use interpreter": "NO", + "Have native code generator": "YES", + "Unregisterised": "NO", + "Leading underscore": "NO", + "target has RTS linker": "YES", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "YES", + "target has GNU nonexec stack": "NO", + "target has subsections via symbols": "NO", + "Target default backend": "native code generator", + }, + + # ── wasm32 cross ───────────────────────────────────────────────────────── + "wasm32-unknown-wasi-cross-no_tntc": { + "target arch": "ArchWasm32", + "target os": "OSWasi", + "target platform string": "wasm32-unknown-wasi", + "target word size": "4", + "target word big endian": "NO", + "Tables next to code": "NO", + "Support SMP": "NO", + "Have interpreter": "YES", + "Use interpreter": "YES", + "Have native code generator": "YES", + "Unregisterised": "NO", + "Leading underscore": "NO", + "target has RTS linker": "YES", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "YES", + "target has GNU nonexec stack": "NO", + "target has subsections via symbols": "NO", + "Target default backend": "native code generator", + }, + + # ── wasm32 cross unregisterised ────────────────────────────────────────── + "wasm32-unknown-wasi-cross-unreg": { + "target arch": "ArchWasm32", + "target os": "OSWasi", + "target platform string": "wasm32-unknown-wasi", + "target word size": "4", + "target word big endian": "NO", + "Tables next to code": "NO", + "Support SMP": "NO", + "Have interpreter": "NO", + "Use interpreter": "NO", + "Have native code generator": "NO", + "Unregisterised": "YES", + "Leading underscore": "NO", + "target has RTS linker": "YES", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "YES", + "target has GNU nonexec stack": "NO", + "target has subsections via symbols": "NO", + "Target default backend": "compiling via C", + }, + + # ── JavaScript cross ───────────────────────────────────────────────────── + "javascript-unknown-ghcjs-cross": { + "target arch": "ArchJavaScript", + "target os": "OSGhcjs", + "target platform string": "javascript-unknown-ghcjs", + "target word size": "4", + "target word big endian": "NO", + "Tables next to code": "YES", + "Support SMP": "NO", + "Have interpreter": "NO", + "Use interpreter": "NO", + "Have native code generator": "NO", + "Unregisterised": "NO", + "Leading underscore": "NO", + "target has RTS linker": "NO", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "YES", + "target has GNU nonexec stack": "NO", + "target has subsections via symbols": "NO", + "Target default backend": "compiling to JavaScript", + }, + + # ── riscv64 Linux cross ────────────────────────────────────────────────── + "riscv64-unknown-linux-cross": { + "target arch": "ArchRISCV64", + "target os": "OSLinux", + "target platform string": "riscv64-unknown-linux", + "target word size": "8", + "target word big endian": "NO", + "Tables next to code": "YES", + "Support SMP": "YES", + "Have interpreter": "NO", + "Use interpreter": "NO", + "Have native code generator": "YES", + "Unregisterised": "NO", + "Leading underscore": "NO", + "target has RTS linker": "YES", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "YES", + "target has GNU nonexec stack": "YES", + "target has subsections via symbols": "NO", + "Target default backend": "native code generator", + }, + + # ── loongarch64 Linux cross ────────────────────────────────────────────── + "loongarch64-unknown-linux-cross": { + "target arch": "ArchLoongArch64", + "target os": "OSLinux", + "target platform string": "loongarch64-unknown-linux", + "target word size": "8", + "target word big endian": "NO", + "Tables next to code": "YES", + "Support SMP": "YES", + "Have interpreter": "NO", + "Use interpreter": "NO", + "Have native code generator": "YES", + "Unregisterised": "NO", + "Leading underscore": "NO", + "target has RTS linker": "NO", + "target RTS linker only supports shared libraries": "NO", + "cross compiling": "YES", + "target has GNU nonexec stack": "YES", + "target has subsections via symbols": "NO", + "Target default backend": "native code generator", + }, +} + +TESTSUITE_CONFIG_EXPECTED = { + + # ── x86_64 Linux ───────────────────────────────────────────────────────── + "x86_64-unknown-linux": { + "platform": "x86_64-unknown-linux", + "arch": "x86_64", + "wordsize": "64", + "have_ncg": True, + "have_interp": True, + "unregisterised": False, + "tables_next_to_code": True, + "leading_underscore": False, + "target_has_smp": True, + "have_RTS_linker": True, + "interp_force_dyn": False, + "cross": False, + }, + + # ── x86_64 Linux unregisterised ────────────────────────────────────────── + "x86_64-unknown-linux-unreg": { + "platform": "x86_64-unknown-linux", + "arch": "x86_64", + "wordsize": "64", + "have_ncg": False, + "have_interp": True, + "unregisterised": True, + "tables_next_to_code": False, + "leading_underscore": False, + "target_has_smp": False, + "have_RTS_linker": True, + "interp_force_dyn": False, + "cross": False, + }, + + # ── x86_64 Linux no tables-next-to-code ────────────────────────────────── + "x86_64-unknown-linux-no_tntc": { + "platform": "x86_64-unknown-linux", + "arch": "x86_64", + "wordsize": "64", + "have_ncg": True, + "have_interp": True, + "unregisterised": False, + "tables_next_to_code": False, + "leading_underscore": False, + "target_has_smp": True, + "have_RTS_linker": True, + "interp_force_dyn": False, + "cross": False, + }, + + # ── aarch64 Linux native ───────────────────────────────────────────────── + "aarch64-unknown-linux": { + "platform": "aarch64-unknown-linux", + "arch": "aarch64", + "wordsize": "64", + "have_ncg": True, + "have_interp": True, + "unregisterised": False, + "tables_next_to_code": True, + "leading_underscore": False, + "target_has_smp": True, + "have_RTS_linker": True, + "interp_force_dyn": False, + "cross": False, + }, + + # ── aarch64 Linux cross ────────────────────────────────────────────────── + "aarch64-unknown-linux-cross": { + "platform": "aarch64-unknown-linux", + "arch": "aarch64", + "wordsize": "64", + "have_ncg": True, + "have_interp": False, + "unregisterised": False, + "tables_next_to_code": True, + "leading_underscore": False, + "target_has_smp": True, + "have_RTS_linker": True, + "interp_force_dyn": False, + "cross": True, + }, + + # ── i386 Linux ─────────────────────────────────────────────────────────── + "i386-unknown-linux": { + "platform": "i386-unknown-linux", + "arch": "i386", + "wordsize": "32", + "have_ncg": True, + "have_interp": True, + "unregisterised": False, + "tables_next_to_code": True, + "leading_underscore": False, + "target_has_smp": True, + "have_RTS_linker": True, + "interp_force_dyn": False, + "cross": False, + }, + + # ── aarch64 macOS ──────────────────────────────────────────────────────── + "aarch64-apple-darwin": { + "platform": "aarch64-apple-darwin", + "arch": "aarch64", + "wordsize": "64", + "have_ncg": True, + "have_interp": True, + "unregisterised": False, + "tables_next_to_code": True, + "leading_underscore": True, + "target_has_smp": True, + "have_RTS_linker": True, + "interp_force_dyn": False, + "cross": False, + }, + + # ── x86_64 macOS ───────────────────────────────────────────────────────── + "x86_64-apple-darwin": { + "platform": "x86_64-apple-darwin", + "arch": "x86_64", + "wordsize": "64", + "have_ncg": True, + "have_interp": True, + "unregisterised": False, + "tables_next_to_code": True, + "leading_underscore": True, + "target_has_smp": True, + "have_RTS_linker": True, + "interp_force_dyn": False, + "cross": False, + }, + + # ── x86_64 FreeBSD ─────────────────────────────────────────────────────── + "x86_64-portbld-freebsd": { + "platform": "x86_64-portbld-freebsd", + "arch": "x86_64", + "wordsize": "64", + "have_ncg": True, + "have_interp": True, + "unregisterised": False, + "tables_next_to_code": True, + "leading_underscore": False, + "target_has_smp": True, + "have_RTS_linker": True, + "interp_force_dyn": False, + "cross": False, + }, + + # ── x86_64 Windows native ──────────────────────────────────────────────── + "x86_64-unknown-mingw32": { + "platform": "x86_64-unknown-mingw32", + "arch": "x86_64", + "wordsize": "64", + "have_ncg": True, + "have_interp": True, + "unregisterised": False, + "tables_next_to_code": True, + "leading_underscore": False, + "target_has_smp": True, + "have_RTS_linker": True, + "interp_force_dyn": False, + "cross": False, + }, + + # ── aarch64 Windows cross ──────────────────────────────────────────────── + "aarch64-unknown-mingw32-cross": { + "platform": "aarch64-unknown-mingw32", + "arch": "aarch64", + "wordsize": "64", + "have_ncg": True, + "have_interp": False, + "unregisterised": False, + "tables_next_to_code": True, + "leading_underscore": False, + "target_has_smp": True, + "have_RTS_linker": True, + "interp_force_dyn": False, + "cross": True, + }, + + # ── wasm32 cross ───────────────────────────────────────────────────────── + "wasm32-unknown-wasi-cross-no_tntc": { + "platform": "wasm32-unknown-wasi", + "arch": "wasm32", + "wordsize": "32", + "have_ncg": True, + "have_interp": True, + "unregisterised": False, + "tables_next_to_code": False, + "leading_underscore": False, + "target_has_smp": False, + "have_RTS_linker": True, + "interp_force_dyn": True, + "cross": True, + }, + + # ── wasm32 cross unregisterised ────────────────────────────────────────── + "wasm32-unknown-wasi-cross-unreg": { + "platform": "wasm32-unknown-wasi", + "arch": "wasm32", + "wordsize": "32", + "have_ncg": False, + "have_interp": False, + "unregisterised": True, + "tables_next_to_code": False, + "leading_underscore": False, + "target_has_smp": False, + "have_RTS_linker": True, + "interp_force_dyn": False, + "cross": True, + }, + + # ── JavaScript cross ───────────────────────────────────────────────────── + "javascript-unknown-ghcjs-cross": { + "platform": "javascript-unknown-ghcjs", + "arch": "javascript", + "wordsize": "32", + "have_ncg": False, + "have_interp": False, + "unregisterised": False, + "tables_next_to_code": True, + "leading_underscore": False, + "target_has_smp": False, + "have_RTS_linker": False, + "interp_force_dyn": False, + "cross": True, + }, + + # ── riscv64 Linux cross ────────────────────────────────────────────────── + "riscv64-unknown-linux-cross": { + "platform": "riscv64-unknown-linux", + "arch": "riscv64", + "wordsize": "64", + "have_ncg": True, + "have_interp": False, + "unregisterised": False, + "tables_next_to_code": True, + "leading_underscore": False, + "target_has_smp": True, + "have_RTS_linker": True, + "interp_force_dyn": False, + "cross": True, + }, + + # ── loongarch64 Linux cross ────────────────────────────────────────────── + "loongarch64-unknown-linux-cross": { + "platform": "loongarch64-unknown-linux", + "arch": "loongarch64", + "wordsize": "64", + "have_ncg": True, + "have_interp": False, + "unregisterised": False, + "tables_next_to_code": True, + "leading_underscore": False, + "target_has_smp": True, + "have_RTS_linker": False, + "interp_force_dyn": False, + "cross": True, + }, +} ===================================== testsuite/tests/driver/config-pins/GhcInfoPins.py ===================================== @@ -0,0 +1,70 @@ +#!/usr/bin/env python3 +"""Check that ghc --info output matches pinned expected values.""" +import ast +import subprocess +import sys + +sys.path.insert(0, '.') +from ConfigPinsExpected import GHC_INFO_EXPECTED, PINNED_GHC_INFO_FIELDS, platform_key + + +def info_platform_key(info_map): + return platform_key( + info_map.get("target platform string", "<unknown>"), + info_map.get("cross compiling", "NO") == "YES", + info_map.get("Unregisterised", "NO") == "YES", + info_map.get("Tables next to code", "YES") == "NO", + ) + + +def main(): + if len(sys.argv) != 2: + print("Usage: GhcInfoPins.py <compiler-path>") + sys.exit(1) + + compiler = sys.argv[1] + try: + result = subprocess.run([compiler, "--info"], capture_output=True, text=True) + except OSError as e: + print(f"Failed to run {compiler!r} --info: {e}") + sys.exit(1) + if result.returncode != 0: + print(f"Error running {compiler!r} --info:\n{result.stderr}") + sys.exit(1) + try: + info_map = dict(ast.literal_eval(result.stdout.strip())) + except (ValueError, SyntaxError) as e: + print(f"Failed to parse {compiler!r} --info output: {e}") + sys.exit(1) + key = info_platform_key(info_map) + + actual = {f: info_map.get(f, "<missing>") for f in PINNED_GHC_INFO_FIELDS} + + if key not in GHC_INFO_EXPECTED: + print(f"Platform key {key!r} not in ConfigPinsExpected.") + print("Add this entry to GHC_INFO_EXPECTED in ConfigPinsExpected.py:") + print() + print(f" {key!r}: {{") + for f, v in actual.items(): + print(f" {f!r}: {v!r},") + print(" },") + sys.exit(1) + + expected = GHC_INFO_EXPECTED[key] + mismatches = [ + (f, ev, actual.get(f, "<missing>")) + for f, ev in sorted(expected.items()) + if ev != actual.get(f, "<missing>") + ] + + if mismatches: + print(f"MISMATCH for {key!r}:") + for f, ev, av in mismatches: + print(f" {f!r}: expected {ev!r}, got {av!r}") + sys.exit(1) + + print(f"OK: {key}") + + +if __name__ == "__main__": + main() ===================================== testsuite/tests/driver/config-pins/TestsuiteConfigPins.py ===================================== @@ -0,0 +1,65 @@ +#!/usr/bin/env python3 +"""Check that Hadrian-supplied testsuite config values match pinned expected values.""" +import sys + +sys.path.insert(0, '.') +from ConfigPinsExpected import TESTSUITE_CONFIG_EXPECTED, platform_key + + +def main(): + if len(sys.argv) != 13: + print("Usage: TestsuiteConfigPins.py platform arch wordsize " + "have_ncg have_interp unreg tntc leading_us has_smp " + "rts_linker interp_dyn cross") + print(f"Got {len(sys.argv) - 1} args: {sys.argv[1:]}") + sys.exit(1) + + (platform, arch, wordsize, + have_ncg, have_interp, unreg, tntc, + lead_us, has_smp, rts_linker, interp_dyn, cross) = sys.argv[1:] + + b = lambda s: s == "1" + actual = { + "platform": platform, + "arch": arch, + "wordsize": wordsize, + "have_ncg": b(have_ncg), + "have_interp": b(have_interp), + "unregisterised": b(unreg), + "tables_next_to_code": b(tntc), + "leading_underscore": b(lead_us), + "target_has_smp": b(has_smp), + "have_RTS_linker": b(rts_linker), + "interp_force_dyn": b(interp_dyn), + "cross": b(cross), + } + key = platform_key(platform, b(cross), b(unreg), not b(tntc)) + + if key not in TESTSUITE_CONFIG_EXPECTED: + print(f"Platform key {key!r} not in ConfigPinsExpected.") + print("Add this entry to TESTSUITE_CONFIG_EXPECTED in ConfigPinsExpected.py:") + print() + print(f" {key!r}: {{") + for k, v in actual.items(): + print(f" {k!r}: {v!r},") + print(" },") + sys.exit(1) + + expected = TESTSUITE_CONFIG_EXPECTED[key] + mismatches = [ + (k, ev, actual[k]) + for k, ev in expected.items() + if ev != actual.get(k) + ] + + if mismatches: + print(f"MISMATCH for {key!r}:") + for k, ev, av in mismatches: + print(f" {k!r}: expected {ev!r}, got {av!r}") + sys.exit(1) + + print(f"OK: {key}") + + +if __name__ == "__main__": + main() ===================================== testsuite/tests/driver/config-pins/all.T ===================================== @@ -0,0 +1,30 @@ +import sys + +# Python run_command rather than compiled Haskell: wasm32/WASI targets cannot +# call runInteractiveProcess from compiled binaries (no process creation in +# WASI). Python scripts run on the host regardless of the target under test. + +test('GhcInfoPins', + [extra_files(['ConfigPinsExpected.py', 'GhcInfoPins.py']), + ignore_stdout], + run_command, + [sys.executable + ' GhcInfoPins.py "' + config.compiler + '"']) + +test('TestsuiteConfigPins', + [extra_files(['ConfigPinsExpected.py', 'TestsuiteConfigPins.py']), + ignore_stdout], + run_command, + [sys.executable + ' TestsuiteConfigPins.py ' + ' '.join([ + config.platform, + config.arch, + config.wordsize, + str(int(config.have_ncg)), + str(int(config.have_interp)), + str(int(config.unregisterised)), + str(int(config.tables_next_to_code)), + str(int(config.leading_underscore)), + str(int(config.target_has_smp)), + str(int(config.have_RTS_linker)), + str(int(config.interp_force_dyn)), + str(int(config.cross)), + ])]) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f0e5999e4d808f57dec2655cb4476c9… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f0e5999e4d808f57dec2655cb4476c9… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/amg/castz] WIP: introduce cast zapping as an alternative to coercion zapping
by Adam Gundry (＠adamgundry) 08 Jun '26

08 Jun '26

Adam Gundry pushed to branch wip/amg/castz at Glasgow Haskell Compiler / GHC Commits: 2652899b by Adam Gundry at 2026-06-08T09:52:19+02:00 WIP: introduce cast zapping as an alternative to coercion zapping - - - - - 60 changed files: - compiler/GHC/Core.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/Coercion/Opt.hs - compiler/GHC/Core/FVs.hs - compiler/GHC/Core/LateCC/OverloadedCalls.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Lint/SubstTypeLets.hs - compiler/GHC/Core/Map/Expr.hs - compiler/GHC/Core/Map/Type.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/CSE.hs - compiler/GHC/Core/Opt/CprAnal.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Core/Opt/Simplify/Env.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/Opt/Simplify/Utils.hs - compiler/GHC/Core/Opt/SpecConstr.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Ppr.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/Seq.hs - compiler/GHC/Core/SimpleOpt.hs - compiler/GHC/Core/Stats.hs - compiler/GHC/Core/Subst.hs - compiler/GHC/Core/Tidy.hs - compiler/GHC/Core/TyCo/FVs.hs - compiler/GHC/Core/TyCo/Ppr.hs - compiler/GHC/Core/TyCo/Ppr.hs-boot - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCo/Rep.hs-boot - compiler/GHC/Core/TyCo/Subst.hs - compiler/GHC/Core/TyCo/Tidy.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/CoreToIface.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Foreign/C.hs - compiler/GHC/HsToCore/Foreign/JavaScript.hs - compiler/GHC/HsToCore/Foreign/Prim.hs - compiler/GHC/HsToCore/Foreign/Wasm.hs - compiler/GHC/HsToCore/Utils.hs - compiler/GHC/Iface/Rename.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Iface/Type.hs - compiler/GHC/IfaceToCore.hs - compiler/GHC/Tc/Solver/Solve.hs - + compiler/GHC/Tc/Types/EvTerm.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Zonk/Type.hs - compiler/GHC/Types/Id/Make.hs - docs/core-spec/CoreLint.ott - docs/core-spec/CoreSyn.ott - docs/users_guide/debugging.rst - testsuite/tests/ghci/prog-mhu002/prog-mhu002c.stdout - testsuite/tests/ghci/scripts/ghci024.stdout The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/2652899b20d105d9c5c49af8c5f6bd7… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/2652899b20d105d9c5c49af8c5f6bd7… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 3 commits: testsuite: Deduplicate --only test names
by Marge Bot (＠marge-bot) 08 Jun '26

08 Jun '26

Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC Commits: 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> - - - - - 9c26952d by Simon Jakobi at 2026-06-07T21:35:09-04:00 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> - - - - - 7da2b325 by Alan Zimmerman at 2026-06-07T21:35:10-04:00 EPA: Rename Transform.anchorEof to addModuleCommentOrigDeltas This now matches what it actually does. - - - - - 4 changed files: - testsuite/driver/runtests.py - testsuite/mk/test.mk - utils/check-exact/Main.hs - utils/check-exact/Transform.hs Changes: ===================================== testsuite/driver/runtests.py ===================================== @@ -133,7 +133,7 @@ if args.unexpected_output_dir: config.unexpected_output_dir = Path(args.unexpected_output_dir) if args.only: - config.only = args.only + config.only = set(args.only) config.run_only_some_tests = True if args.skip: ===================================== testsuite/mk/test.mk ===================================== @@ -109,9 +109,11 @@ endif HAVE_GDB := $(shell if gdb --version > /dev/null 2> /dev/null; then echo YES; else echo NO; fi) HAVE_READELF := $(shell if readelf --version > /dev/null 2> /dev/null; then echo YES; else echo NO; fi) -# we need a better way to find which backend is selected and if --check flag is -# used -BIGNUM_GMP := $(shell "$(GHC_PKG)" field ghc-bignum exposed-modules | grep GMP) +# Detect whether the fast (GMP) bignum backend is in use. The GMP backend module +# in ghc-internal is hidden, so we look instead for the gmp library it links +# against: GMP_LIBS adds gmp to ghc-internal's extra-libraries only on a GMP +# build. +BIGNUM_GMP := $(shell "$(GHC_PKG)" field ghc-internal extra-libraries 2>/dev/null | grep gmp) ifeq "$(filter thr, $(GhcRTSWays))" "thr" RUNTEST_OPTS += -e config.ghc_with_threaded_rts=True ===================================== utils/check-exact/Main.hs ===================================== @@ -646,7 +646,7 @@ addLocaLDecl3 :: Changer addLocaLDecl3 libdir top = do Right newDecl <- withDynFlags libdir (\df -> parseDecl df "decl" "nn = 2") let - doAddLocal = replaceDecls (anchorEof lp) [parent',d2'] + doAddLocal = replaceDecls (addModuleCommentOrigDeltas lp) [parent',d2'] where lp = top (de1:d2:_) = hsDecls lp @@ -667,7 +667,7 @@ addLocaLDecl4 libdir lp = do Right newDecl <- withDynFlags libdir (\df -> parseDecl df "decl" "nn = 2") Right newSig <- withDynFlags libdir (\df -> parseDecl df "sig" "nn :: Int") let - doAddLocal = replaceDecls (anchorEof lp) (parent':ds) + doAddLocal = replaceDecls (addModuleCommentOrigDeltas lp) (parent':ds) where (parent:ds) = hsDecls (makeDeltaAst lp) @@ -781,7 +781,7 @@ rmDecl3 _libdir lp = do rmDecl4 :: Changer rmDecl4 _libdir lp = do let - doRmDecl = replaceDecls (anchorEof lp) [de1',sd1] + doRmDecl = replaceDecls (addModuleCommentOrigDeltas lp) [de1',sd1] where [de1] = hsDecls lp (de1',Just sd1) = modifyValD (getLocA de1) de1 $ \_m [sd1a,sd2] -> ===================================== utils/check-exact/Transform.hs ===================================== @@ -65,7 +65,7 @@ module Transform , balanceComments , balanceCommentsList , balanceCommentsListA - , anchorEof + , addModuleCommentOrigDeltas -- ** Managing lists, pure functions , captureOrderBinds @@ -724,8 +724,8 @@ balanceSameLineComments (L la (Match anm mctxt pats (GRHSs x grhss lb))) -- --------------------------------------------------------------------- -anchorEof :: ParsedSource -> ParsedSource -anchorEof (L l m@(HsModule (XModulePs an _lo _ _) _mn _exps _imps _decls)) = L l (m { hsmodExt = (hsmodExt m){ hsmodAnn = an' } }) +addModuleCommentOrigDeltas :: ParsedSource -> ParsedSource +addModuleCommentOrigDeltas (L l m@(HsModule (XModulePs an _lo _ _) _mn _exps _imps _decls)) = L l (m { hsmodExt = (hsmodExt m){ hsmodAnn = an' } }) where an' = addCommentOrigDeltasAnn an View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/fcfa08345e2af28169df6963fcb83a… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/fcfa08345e2af28169df6963fcb83a… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/az/epa-fix-transform-anchoreof] EPA: Rename Transform.anchorEof to addModuleCommentOrigDeltas
by Alan Zimmerman (＠alanz) 07 Jun '26

07 Jun '26

Alan Zimmerman pushed to branch wip/az/epa-fix-transform-anchoreof at Glasgow Haskell Compiler / GHC Commits: 4588a803 by Alan Zimmerman at 2026-06-07T22:06:43+01:00 EPA: Rename Transform.anchorEof to addModuleCommentOrigDeltas This now matches what it actually does. - - - - - 2 changed files: - utils/check-exact/Main.hs - utils/check-exact/Transform.hs Changes: ===================================== utils/check-exact/Main.hs ===================================== @@ -646,7 +646,7 @@ addLocaLDecl3 :: Changer addLocaLDecl3 libdir top = do Right newDecl <- withDynFlags libdir (\df -> parseDecl df "decl" "nn = 2") let - doAddLocal = replaceDecls (anchorEof lp) [parent',d2'] + doAddLocal = replaceDecls (addModuleCommentOrigDeltas lp) [parent',d2'] where lp = top (de1:d2:_) = hsDecls lp @@ -667,7 +667,7 @@ addLocaLDecl4 libdir lp = do Right newDecl <- withDynFlags libdir (\df -> parseDecl df "decl" "nn = 2") Right newSig <- withDynFlags libdir (\df -> parseDecl df "sig" "nn :: Int") let - doAddLocal = replaceDecls (anchorEof lp) (parent':ds) + doAddLocal = replaceDecls (addModuleCommentOrigDeltas lp) (parent':ds) where (parent:ds) = hsDecls (makeDeltaAst lp) @@ -781,7 +781,7 @@ rmDecl3 _libdir lp = do rmDecl4 :: Changer rmDecl4 _libdir lp = do let - doRmDecl = replaceDecls (anchorEof lp) [de1',sd1] + doRmDecl = replaceDecls (addModuleCommentOrigDeltas lp) [de1',sd1] where [de1] = hsDecls lp (de1',Just sd1) = modifyValD (getLocA de1) de1 $ \_m [sd1a,sd2] -> ===================================== utils/check-exact/Transform.hs ===================================== @@ -65,7 +65,7 @@ module Transform , balanceComments , balanceCommentsList , balanceCommentsListA - , anchorEof + , addModuleCommentOrigDeltas -- ** Managing lists, pure functions , captureOrderBinds @@ -724,8 +724,8 @@ balanceSameLineComments (L la (Match anm mctxt pats (GRHSs x grhss lb))) -- --------------------------------------------------------------------- -anchorEof :: ParsedSource -> ParsedSource -anchorEof (L l m@(HsModule (XModulePs an _lo _ _) _mn _exps _imps _decls)) = L l (m { hsmodExt = (hsmodExt m){ hsmodAnn = an' } }) +addModuleCommentOrigDeltas :: ParsedSource -> ParsedSource +addModuleCommentOrigDeltas (L l m@(HsModule (XModulePs an _lo _ _) _mn _exps _imps _decls)) = L l (m { hsmodExt = (hsmodExt m){ hsmodAnn = an' } }) where an' = addCommentOrigDeltasAnn an View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/4588a8030dce3834501e31aad55932d… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/4588a8030dce3834501e31aad55932d… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc] Pushed new branch wip/romes/fix-test
by Rodrigo Mesquita (＠alt-romes) 07 Jun '26

07 Jun '26

Rodrigo Mesquita pushed new branch wip/romes/fix-test at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/romes/fix-test You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc] Pushed new branch wip/az/epa-fix-transform-anchoreof
by Alan Zimmerman (＠alanz) 07 Jun '26

07 Jun '26

Alan Zimmerman pushed new branch wip/az/epa-fix-transform-anchoreof at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/az/epa-fix-transform-anchoreof You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/supersven/cross-compiler-manual-test-jobs] ci: symlink bootstrap GHC for test tool builds in cross test job
by Sven Tennie (＠supersven) 07 Jun '26

07 Jun '26

Sven Tennie pushed to branch wip/supersven/cross-compiler-manual-test-jobs at Glasgow Haskell Compiler / GHC Commits: dd382451 by Sven Tennie at 2026-06-07T18:00:07+00:00 ci: symlink bootstrap GHC for test tool builds in cross test job Cross-compiler bindist only provides the cross-prefixed ghc binary. Hadrian needs a native ghc at _build/install/bin/ghc to build test support tools (check-exact, ghc-config). Symlink to bootstrap GHC which is on PATH after ci.sh setup. Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com> - - - - - 1 changed file: - .gitlab/ci.sh Changes: ===================================== .gitlab/ci.sh ===================================== @@ -652,6 +652,13 @@ function test_hadrian_cross_full() { tar xJf "${BIN_DIST_NAME}.tar.xz" install_bindist ghc-*/ "$instdir" + # Cross-compiler bindist provides only the cross-prefixed ghc binary, not a + # native ghc. Hadrian needs a native ghc at this path to build test support + # tools (check-exact, ghc-config). Symlink to the bootstrap GHC from setup. + if [[ ! -e "$instdir/bin/ghc" ]]; then + ln -sf "$(command -v ghc)" "$instdir/bin/ghc" + fi + EXTRA_HC_OPTS="-fexternal-interpreter" run_hadrian \ test \ --summary-junit=./junit.xml \ View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/dd38245169e7890f7e486d4b77a7c40… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/dd38245169e7890f7e486d4b77a7c40… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/supersven/flags-pin-test] 70 commits: Move the `Text.Read` implementation into `base`
by Sven Tennie (＠supersven) 07 Jun '26

07 Jun '26

Sven Tennie pushed to branch wip/supersven/flags-pin-test at Glasgow Haskell Compiler / GHC Commits: 44cf9cd7 by Wolfgang Jeltsch at 2026-05-12T09:48:18-04:00 Move the `Text.Read` implementation into `base` - - - - - 4ac3f7d6 by Vladislav Zavialov at 2026-05-12T09:49:03-04:00 EPA: Use AnnParen for tuples and sums Summary of changes * Do not use AnnParen in XListTy, replace it with EpToken "[" and "]" * Specialise AnnParen to tuple/sums by dropping the AnnParensSquare and keeping only AnnParens and AnnParensHash * Use AnnParen in XExplicitTuple * Use AnnParen in XExplicitTupleTy * Use AnnParen in XTuplePat * Use AnnParen in XExplicitSum (via AnnExplicitSum) * Use AnnParen in XSumPat (via EpAnnSumPat) This is a refactoring with no user-facing changes. - - - - - 1bdcddec by Duncan Coutts at 2026-05-12T09:49:48-04:00 Add minimal dlltool support to ghc-toolchain The dlltool is a tool that can create dll import libraries from .def files. These .def files list the exported symbols of dlls. Its somewhat like gnu linker scripts, but more limited. We will need dlltool to build the rts and ghc-internal libraries as DLLs on Windows. The rts and ghc-internal libraries have a recursive dependency on each other. Import libraries can be used to resolve recursive dependencies between dlls. We will use an import library for the rts when linking the ghc-internal library. - - - - - f7fc3770 by Duncan Coutts at 2026-05-12T09:49:48-04:00 Add minimal dlltool support into ./configure Find dlltool, and hopefully support finding it within the bundled llvm toolchain on windows. - - - - - e4e22bfb by Duncan Coutts at 2026-05-12T09:49:48-04:00 Update the default host and target files for dlltool support - - - - - 5666c8f9 by Duncan Coutts at 2026-05-12T09:49:48-04:00 Add dlltool as a hadrian builder Optional except on windows. - - - - - 5e14fe3f by Duncan Coutts at 2026-05-12T09:49:48-04:00 Update and generate libHSghc-internal.def from .def.in file The only symbol that the rts imports from the ghc-internal package now is init_ghc_hs_iface. So the rts only needs an import lib that defines that one symbol. Also, remove the libHSghc-prim.def because it is redundant. The rts no longer imports anything from ghc-prim. Keep libHSffi.def for now. We may yet need it once it is clear how libffi is going to be built/used for ghc. - - - - - 3d91e4a6 by Duncan Coutts at 2026-05-12T09:49:48-04:00 Add rule to build libHSghc-internal.dll.a and link into the rts On windows only, with dynamic linking. This is needed because on windows, all symbols in dlls must be resolved. No dangling symbols allowed. References to external symbols must be explicit. We resolve this with an import library. We create an import library for ghc-internal, a .dll.a file. This is a static archive containing .o files that define the symbols we need, and crucially have ".idata" sections that specifies the symbols the dll imports and from where. Note that we do not install this libHSghc-internal.dll.a, and it does not need to list all the symbols exported by that package. We create a special purpose import lib and only use it when linking the rts dll, so it only has to list the symbols that the rts uses from ghc-internal (which is exactly one symbol: init_ghc_hs_iface). - - - - - c8dae539 by Alice Rixte at 2026-05-12T09:50:52-04:00 Script for downloading and copying `base-exports` file - - - - - 5fab2238 by Wolfgang Jeltsch at 2026-05-12T21:24:27+03:00 Introduce a cache of home module name providers This contribution introduces to the module graph a cache that maps home module names to sets of units providing them and changes the finder to use that cache. This is a performance optimization, especially for multi-home-unit builds. The particular changes are as follows: * In `GHC.Unit.Module.Graph`, `ModuleGraph` is extended with a new field `mg_home_module_name_providers_map`, exposed as `mgHomeModuleNameProvidersMap`. This is a cache that assigns to each home module name the set of IDs of home units that define it. Operations that construct module graphs are updated such that this cache stays synchronized. * In `GHC.Unit.Finder`, `findImportedModule` is changed to pull `mgHomeModuleNameProvidersMap` from `hsc_mod_graph` and pass it to `findImportedModuleNoHsc`, which now does not search home units in arbitrary order but prioritizes those units that the cache mentions as potential providers of the requested module. In addition, this contribution adds variants of the two multi-component compiler performance tests that use 100 units instead of 20, because with just 20 units the benefits from caching of home module name providers are still negligible. The following table shows the total time needed for running both multi-component tests before and after this contribution and with different numbers of units: | # of units | Before | After | |-----------:|-------:|------:| | 20 | 0:12 | 0:12 | | 100 | 0:47 | 0:42 | | 200 | 3:05 | 2:08 | Note that there seems to be a general overhead of 12 seconds that is not attributable to the actual tests, so that the real running times should be 12 seconds smaller than shown above. Resolves #27055. Metric Decrease: MultiComponentModules MultiComponentModulesRecomp Co-authored-by: Matthew Pickering <matthewtpickering(a)gmail.com> Co-authored-by: Fendor <fendor(a)posteo.de> - - - - - 38b76b2f by Cheng Shao at 2026-05-13T17:48:48-04:00 testsuite: mark T22159 as fragile This patch marks T22159 as fragile on Windows for issue described in #27248. Before we get to the bottom of those failures, this unblocks newer Windows runners. - - - - - 50188615 by Ian Duncan at 2026-05-14T13:45:07+02:00 AArch64: use ASR not LSR for MO_U_Shr at W8/W16 The unsigned right shift (MO_U_Shr) for sub-word widths (W8, W16) with a variable shift amount was emitting ASR (arithmetic/signed shift right) after zero-extending with UXTB/UXTH. This should be LSR (logical/unsigned shift right). After zero-extension the upper bits happen to be 0 so ASR produces the same result, but it is semantically wrong and would break if the zero-extension were ever optimized away. Includes assembly output test (grep for lsr) and runtime test verifying unsigned right shift of Word8 and Word16 values. - - - - - 28666fbf by Vladislav Zavialov at 2026-05-19T12:44:05-04:00 Add type families: Tuple, Constraints, Tuple#, Sum# (#27179) These type families map tuples of types to the corresponding Tuple<N>, Tuple<N>#, CTuple<N>, and Sum<N># types. Some examples at N=2: Tuple (Int, Bool) = Tuple2 Int Bool Constraints (Show a, Eq a) = CTuple2 (Show a) (Eq a) Tuple# (Int#, Float#) = Tuple2# Int# Float# Sum# (Int#, Float#) = Sum2# Int# Float# See GHC Proposal #145 "Non-punning list and tuple syntax". To make the Sum# instance at N=64 possible, this patch also introduces the Sum64# constructor declaration and bumps mAX_SUM_SIZE from 63 to 64. Metric Increase: ghc_experimental_dir - - - - - 41c2448b by Wen Kokke at 2026-05-19T12:44:53-04:00 rts: Add IPE event class for -l This commit adds a new IPE event class to the -l RTS flag. Previously, IPE events were enabled unconditionally. However, the IPE events can easily grow to hundreds or thousands of megabytes. With the new event class you can pass, e.g., -l-I to disable IPE events. - - - - - 62536551 by Wen Kokke at 2026-05-19T12:44:53-04:00 ghc-internal: Add TraceFlags.traceIPE - - - - - e45312d1 by Wen Kokke at 2026-05-19T12:44:53-04:00 testsuite: Add test for TraceFlags.traceIpe - - - - - 4768d9aa by Wen Kokke at 2026-05-19T12:44:53-04:00 ghc-internal: Add DebugFlags.ipe - - - - - bc1b5c69 by Wen Kokke at 2026-05-19T12:44:53-04:00 testsuite: Add test for DebugFlags.ipe - - - - - 0da1543f by Duncan Coutts at 2026-05-19T12:45:37-04:00 Document removal of the signal-based interval timer Update mentions within the RTS section of the users guide. Add a changelog entry. - - - - - b2911514 by Duncan Coutts at 2026-05-19T12:45:37-04:00 Fix section for an recent changelog entry - - - - - d6d76a7a by David Eichmann at 2026-05-19T12:46:19-04:00 ghc-toolchain: implement llvm program versioning logic - - - - - 2dd36fa3 by Wolfgang Jeltsch at 2026-05-20T04:49:52-04:00 Turn `Trustworthy` into `Safe` in `base` where possible - - - - - f4399dd1 by Wolfgang Jeltsch at 2026-05-20T04:50:37-04:00 Make the current `base` buildable with GHC 10.0 - - - - - 1a7de232 by Duncan Coutts at 2026-05-20T12:26:25-04:00 Hadrian: remove legacy rts .so symlinks For compatibility with the old makefile based build system, hadrian had rules to generate symlinks from unversioned to versioned names for the rts .so/.dynlib file, like libHSrts-ghcx.y.so -> libHSrts-1.0.3-ghcx.y.so We no longer need these symlinks since the makefile build system has been retired some time ago. The need for these symlinks is awkward on windows where we cannot (in practice) create symlinks. So rather than make them conditional (non-windows), just remove them entirely. - - - - - 286f1adf by fendor at 2026-05-20T12:27:09-04:00 Fix regression T27202: `:load` and `:add` work in GHCi To fix the regression there are conceptually two major things that we fix: * We don't remove the `importDirs` from `interactive-session` * When `:add`ing a module, we don't try to find them via PackageImports * The PackageImport is wrong as we can't know the package-name at this stage in ghc/UI.hs What does it mean to not remove the `importDirs` from `interactive-session`? It means that, given some initial `DynFlags`, we will use those `importDirs` in `interactive-session`. The initial `DynFlags`, however, depend on how you initialise the GHC session. For a simple session, initialised by ghc -isrc -this-unit-id main It is simple, just use the `DynFlags` given on the cli. Thus, `main` and `interactive-session` will have the same `DynFlags`, except for the `homeUnitId` and `interactive-session` depends on `main` by construction of the GHCi session. What about a multiple home unit session, though? ghc -unit @unit1 -unit @unit2 What are the `DynFlags` in this cli invocation? It shouldn't be either `@unti1` nor `@unit2`, as the order shouldn't matter or any other implicit condition. For consistency, we decide that the initial `DynFlags` are the top `DynFlags` on the cli, ignoring `-unit` flags. Thus, in this example, there are no `importsDirs` regardless of what we might find in `@unit1` and `@unit2`. But in this invocation: ghc -isrc -unit @unit1 -unit @unit2 The `interactive-session` will have the `importsDirs` `src`. Note, `-isrc` will be inherited in `@unit1` and `@unit2`, so you need to explicitly use `-i` to clear the `importsDirs`, in order to avoid accidentally adding `src` as an import directory to all other home units. This fix has been made possible by the improvements introduced in !15888, which avoids ambiguity when a home unit shares the `importsDirs` with the `interactive-session`, on top of being much faster for multiple home units. Adds regression tests for T27202 for `:load`ing and `:add`ing modules that are located in import directories. - - - - - 728662de by fendor at 2026-05-20T12:27:09-04:00 Use home unit package db stacks in GHCi prompt and session unit In order to import modules from home unit dependencies (e.g., `Data.Map`), the ghci prompt unit needs to populate its `UnitState`. This is tricky to handle correctly, which `PackageDBFlag`s should we use to populate the `UnitState`? We decide, the most intuitive solution for users is to depend on all `PackageDBFlag`s, so that any dependency can be imported in GHCi. This assumes consistency in the `PackageDBFlag`s, so no two home units specify `PackageDBFlag`s that are inconsistent with each other. We could simply concat all the `PackageDBFlag`s of the existing home units, but later `PackageDBFlag`s shadow earlier ones, leading to the last processed home units' `PackageDBFlag`s to shadow the earlier ones. This is hard to fix, we need to give users the capability to provide ghc options for the ghci prompt home unit. However, as this is considerably more work, we decided on an approximation that should work out most of the time. Package Db stacks in cabal and stack follow a certain structure: -no-user-package-db > -package-db $cabal-store > -package-db $local-db The first two arguments are always the same, namely the `-no-user-package-db` and `-package-db`. We compute the longest common prefix over all home units, and use that as the start of the package db stack. Then, over the rest of the `PackageDBFlag`s, we simply take the union and append them to our initial stack. We assume, that the rest of package dbs only defines very few, "local" units that are usually not shadowing each other. This allows us to get a relatively consistent package database stack for the ghci prompt home unit. Similar reasoning applies to the session unit in order to add modules to the session and have dependencies available in the module. We do something similar for `-package` flags, to make sure only the correct units are actually visible in the ghci session. This time, we simply take the union of all `PackageFlag`s, allowing us to import modules from the home unit dependencies. In the future, it would be beneficial to allow the user to provide the exact ghc options to control the visibilities. For now, this will have to do. - - - - - 740d89a0 by Simon Peyton Jones at 2026-05-20T17:20:44-04:00 Do not use mkCast during typechecking This commit fixes #27219. The problem was that the typechecker was using `mkCast`, whose assertion checks legitimately fail when applied to types that contain unification variables. - - - - - a50fdb06 by Simon Peyton Jones at 2026-05-20T17:20:45-04:00 Major refactor of the Simplifier The main payload of this patch is to refactor the Simplifer to avoid repeated simplification when using Plan (AFTER) for rule rewrites. The need for this was shown up by #26989. See Note [Avoid repeated simplification] in GHC.Core.Opt.Simplify.Iteration. Related refactoring: * Refactor the two fields `sc_dup` and `sc_env` in `ApplyToVal` into one, `sc_env`. Reason: the envt is irrelevant in the "simplified" case, so the data type describes the possiblitiies much more accurately now. * Some refactoring in `knownCon` to split off `wrapDataConFloats`. * Refactor `lookupRule` and its auxiliary functions to return `RuleMatch`, a new data type. See Note [data RuleMatch] in GHC.Core. Ditto for BuiltinRule. This RuleMatch returns fragments of the target in rm_args and rm_floats, leaving `rm_rhs` to be the stuff from the RULE itself. Doing this has routine consequences in GHC.Core.Opt.ConstantFold. Many changes there but all routine. * When doing occurrence analysis on RULEs, make the occ-info on the rule binders relate just to the RHS, not the LHS. See (OUR1) in Note Note [OccInfo in unfoldings and rules] This means that Lint must not complain about the fact that the patterns in the RULE mentions binders that are marked dead. See Note [Dead occurrences] in GHC.Core.Lint. I changed the Core pretty-printer so that it didn't suppress dead binders, else I can't see those binders in RULEs. That led to quite a lot of testsuite wibbles. * Refactor FloatBinds, so that it is used both by `exprIsConApp_mabye` and by `lookupRule` * Move the definition of FloatBinds out of GHc.Core.Make, into GHC.Core. * Add FloatTick as an extra constructor. * Refactor `lookupRule` to use `FloatBinds` instead of `BindWrapper`. This refactor just shares more code. (Rename GHC.Core.Opt.FloatOut.FloatBinds to FloatLets, to avoid gratuitious name clash with GHC.Core.FloatBinds.) Corecion optimisation * In simpleOpt, when composing coercions, call new function `optTransCo`. This is much lighter weight than full blown coercion optimisation. * Make `GHC.Core.Opt.Arity.pushCoValArg` and `pushCoTyArg` return the coercionLKind of the coercion. This saves recomputing that coercionLKind at the key call sites in GHC.Core.Opt.Simplify.Iteration.pushCast. * Rename `addCoerce` in GHC.Core.Simplify.Iteration to become `pushCast`. * In the `ApplyToVal` case of `pushCast` we had a very unsavoury call to `simplArg`. I eliminated it by adding a field `sc_cast` to `ApplyToVal` that records any pending casts. Much nicer now. See Note [The sc_cast field of ApplyToVal]. * Don't optimise coercions if the type-substitution is empty. See Note [Optimising coercions] in GHC.Core.Opt.Simplify.Iteration. The fix for #26838 is dramatic. For the test in perf/compiler/T26839 we have Compiler allocs: Before: 7,363M After: 688M Compile time goes down generally. Here are compiler-alloc changes over 0.5%: CoOpt_Read(normal) 729,184,920 -0.7% CoOpt_Singletons(normal) 666,916,960 -4.6% GOOD LargeRecord(normal) 1,227,056,876 +1.1% T12227(normal) 256,827,604 -4.6% GOOD T12425(optasm) 76,879,410 -0.8% T12545(normal) 787,826,918 -10.8% GOOD T12707(normal) 775,186,464 -0.9% T13253(normal) 318,599,596 -0.8% T14766(normal) 685,857,320 -1.0% T15304(normal) 1,123,333,422 -2.2% T15630(normal) 123,142,330 -2.6% T15630a(normal) 123,092,100 -2.6% T15703(normal) 299,751,682 -2.9% GOOD T17516(normal) 964,072,280 +1.0% T18223(normal) 367,016,820 -6.2% GOOD T18730(optasm) 130,643,770 -3.3% GOOD T20261(normal) 535,608,584 -0.7% T21839c(normal) 340,340,436 -0.9% T24984(normal) 85,568,392 -1.9% T3064(normal) 174,631,992 -1.2% T3294(normal) 1,215,886,432 -0.7% T5030(normal) 141,449,704 -17.2% GOOD T5321Fun(normal) 258,484,744 -1.9% T8095(normal) 770,532,232 -2.7% T9630(normal) 858,423,408 -14.5% GOOD T9872c(normal) 1,591,709,448 +0.7% info_table_map_perf(normal) 19,700,614,458 -1.3% geo. mean -0.7% minimum -17.2% maximum +1.1% However, strangely there seems to be a 5.0% increase in CoOpt_Read in the x86_64-linux-fedora43-validate+debug_info+ubsan job, although there generally a /decrease/ in this test in other builds. The baseline value looks strange. Anyway I'll just accept it. Metric Decrease: CoOpt_Singletons T12227 T12545 T12707 T15703 T18223 T18730 T21839c T5030 T9630 Metric Increase: CoOpt_Read - - - - - 834623d4 by Mrjtjmn at 2026-05-20T17:21:41-04:00 users-guide: Fix weird notation in "Summary of stolen syntax" - - - - - 6f9d7c71 by Markus Läll at 2026-05-21T15:25:34-04:00 Use "grimily" instead of "grimly" Fixes https://gitlab.haskell.org/ghc/ghc/-/issues/27221 - - - - - 50e999ca by fendor at 2026-05-21T15:26:18-04:00 Speed up 'closure' computation in `ghc-pkg` Cache the set of already seen `UnitId`s and use `Set` operations to speed up 'closure' computation. Further simplify the implementation of 'closure' to account for the actual usage. As a consequence, we rename 'closure' to 'brokenPackages' to reflect its purpose better after the simplification. - - - - - 7ecc6184 by sheaf at 2026-05-21T15:27:10-04:00 TcMPluginHandling: be more lenient when no plugins This change ensures that, if a function such as 'typecheckModule' was invoked with 'NoTcMPlugins', GHC doesn't spuriously complain about TcM plugins having already been stopped, as there were none to start with. - - - - - 72c8de5c by Simon Jakobi at 2026-05-23T18:41:42-04:00 Implement List.elem via foldr ...in order to allow specialization to Eq instances. The implementation of notElem is updated for consistency.` Corresponding CLC proposal: https://github.com/haskell/core-libraries-committee/issues/412 Addresses #27096. - - - - - 3268c610 by Alan Zimmerman at 2026-05-23T18:42:30-04:00 EPA: Fix span for qualified multiline string Fix the span for a qualified multiline string like Text.""" I'm a multiline Text value ! """ to extend to the end of the entire string, not just the first line. Closes #27274 - - - - - 1f096790 by Alan Zimmerman at 2026-05-23T18:43:20-04:00 EPA: Fix exact printing namespace-specified wildcards Ensures correct printing of imports of the form import Data.Bool (data True(data ..)) import Data.Bool (data True(type ..)) Closes #27291 - - - - - 56ada7c0 by Mrjtjmn at 2026-05-23T18:44:19-04:00 Fix ambiguous syntax of BangPatterns in users guide Update documentation for the BangPatterns extension to specify how surrounding whitespace affects interpretation of `!`. * Only when there is whitespace before `!` and no whitespace after, it is recognized as a BangPattern. * Other cases `⟨varid⟩!⟨varid⟩`, `⟨varid⟩ ! ⟨varid⟩`, `⟨varid⟩! ⟨varid⟩` are treated as infix operators. - - - - - 579aa0b7 by Simon Jakobi at 2026-05-25T16:31:26-04:00 Ensure that SetOps.{minusList,unionListsOrd} can be specialized ...by marking them INLINABLE. Haddock allocates 0.1–0.3% less as a result. This also removes some redundant constraints on unionListsOrd. - - - - - cccf45da by Cheng Shao at 2026-05-25T16:32:13-04:00 wasm: ensure post-linker output is synchronous ESM This patch fixes wasm backend's post-linker output script to ensure it's synchronous ESM and doesn't use top-level await, which doesn't work in ServiceWorkers. Fixes #27257. - - - - - 8db331a3 by Zubin Duggal at 2026-05-26T04:54:03-04:00 Update to semaphore-compat 2.0.0 using v2 of the protocol On Linux and other POSIX platforms, GHC's -jsem jobserver client now speaks v2 of the semaphore-compat protocol, which uses Unix domain sockets in place of POSIX named semaphores. This avoids the libc-ABI issues that affected the old implementation. Windows is unaffected and continues to use the v1 protocol (Win32 named semaphores); its reported protocol version remains v1. When GHC receives a -jsem name whose protocol version it does not support, it emits a -Wsemaphore-version-mismatch warning and falls back to -j<N> rather than crashing. ghc --info exposes the supported version in a new "Semaphore version" entry so cabal-install can detect a mismatch before invoking GHC. Users on a cabal-install that predates the v2 update will continue to build successfully on Linux/POSIX, but will lose the cross-process -jsem coordination and fall back to -j<N> per GHC invocation. Users must upgrade to a cabal-install that supports protocol v2 to recover full parallelism. Also fix a leak in cleanupSem (#27253): cleanupSem used to snapshot heldTokens and release them before killing the loop, while the loop's in-flight acquire/release children could still be mutating it. Cleanup now runs inside the loop's own exit handler, after draining the active child via a new activeChild TVar, so the snapshot has no concurrent mutator. See also: - GHC proposal amendment: https://github.com/ghc-proposals/ghc-proposals/pull/673 - cabal-install patch: https://github.com/haskell/cabal/pull/11628 - semaphore-compat MR: https://gitlab.haskell.org/ghc/semaphore-compat/-/merge_requests/8 Bump semaphore-compat submodule to 2.0.0 Fixes #25087 and #27253 - - - - - 17be4f1f by Alan Zimmerman at 2026-05-26T04:54:52-04:00 EPA: Record semicolons in HsModifier Ensure the semi colons are captured in the ParsedSource for code like %True;; %False; instance C D It makes HsModifier (and hence HsModifierOf) LocatedA, so the semi colons can be recorded as [TrailingAnn] Also rename pprHsModifiers to pprLHsModifiers to match. Closes #27294 - - - - - 8f991755 by fendor at 2026-05-26T11:02:52-04:00 Revert prog003 acceptance We thought the commit 286f1adff3e78d775ff325caff71d0cee25d710b fixed the test, but due to changes to ghci, modules loaded during the GHCi session, the test was actually no longer testing what it set out to do, "fixing" the broken test. As modules are added to the `interactive-session` home unit, the object code needs to be compiled with `-this-unit-id interactive-session`, otherwise the object code won't be used. Once this has been fixed in the test, the test fails as expected again. - - - - - 277a3687 by mangoiv at 2026-05-26T11:03:40-04:00 libraries/process: bump submodule to v1.6.29.0 This submodule bump resolves a segfault on macos 15. Fixes #27144 - - - - - 6779bb0c by mangoiv at 2026-05-26T11:03:40-04:00 libraries/unix: in submodule, don't pick branch 2.7 The 2.7 branch is outdated and the module has been advanced far beyond it anyway, so remove that line. - - - - - 4a645683 by Simon Peyton Jones at 2026-05-27T21:41:59-04:00 Trim the continuation in mkDupableContWithDmds When there are no remaining argument demands, it means the application is bottoming. In this case, we can trim the continuation to avoid the panic that was observed in #27261. See Note [Trimming the continuation for bottoming functions] in GHC.Core.Opt.Simplify.Iteration. - - - - - 8ab506ff by Cheng Shao at 2026-05-27T21:42:47-04:00 ghci: fix module name string lifetime in hs_hpc_module invocation This patch makes hpcAddModule pass a properly malloced module name string to hs_hpc_module, instead of using useAsCString which causes use-after-free of module name string. Fixes #27297. Co-authored-by: Codex <codex(a)openai.com> - - - - - b0233814 by sheaf at 2026-05-27T21:43:31-04:00 Relax acceptance threshold for T10421 As seen in #27289, the 1% acceptance threshold for this text was overly narrow, resulting in spurious test failures. This commit widens the acceptance threshold to 2%. Fixes #27289. - - - - - 63ce5770 by Luite Stegeman at 2026-05-28T12:23:35-04:00 Fixes for black holes - suspend duplicate work for eager black holes - detect eager black holes in checkBlockingQueues - don't overwrite existing black holes even if they're not in an eager blackhole frame - don't deadlock on self when thunk is already blackholed Fixes #26936 - - - - - 037a80dc by Tom McLaughlin at 2026-05-28T12:24:36-04:00 Event/Windows.hsc: rethrow exceptions in overlapped IO This prevents the WinIO manager from swallowing exceptions in overlapped IO. It was added to make WinIO support possible in the `network` library. See https://gitlab.haskell.org/ghc/ghc/-/issues/27283. We also bump __IO_MANAGER_WINIO__ to 2 so libraries can gate on this using CPP. - - - - - 2d53bcdb by Wolfgang Jeltsch at 2026-05-28T12:25:21-04:00 Allow `downsweep` to use nodes of an existing module graph To this end, `downsweep` has not been able to use the nodes of a module graph obtained from a previous downsweeping round. In some GHC API applications, downsweeping is performed somewhat incrementally and therefore could profit from reusing such existing results. This contribution makes this possible. Resolves #27054. Co-authored-by: Matthew Pickering <matthewtpickering(a)gmail.com> - - - - - f4fbb583 by Simon Jakobi at 2026-05-28T12:26:04-04:00 Add regression test for T11226 Closes #11226. - - - - - ed29a5e6 by Sven Tennie at 2026-05-28T17:30:36-04:00 Add optional config setting for LibDir (#19174) Previously, the `libDir` was derived from `topDir`. This won't work for inplace stage2 cross-compilers where binaries and libraries are in different stage dirs (`_build/stage1/` for executables and `_build/stage2` for libraries). `LibDir` is set in the inplace `settings` files. For bindists, we generate a new `settings` file with no `LibDir` entry. GHC then defaults to use `topDir` as `libDir` again. This keeps the bindist relocatable. If `LibDir` is a relative path, it is interpreted relatively to `topDir`. The global package db is part of the `lib/` folder. If we want to point for inplace cross-compilers to the succeeding stage's folder, this is done by setting `LibDir`. Thus, the global package db must be found relative to `libDir`` (which may default to `topDir` or be set by `LibDir`). The complexity of settings becomes scary. So, add a test to ensure `LibDir` works as expected. - - - - - 8339cf8f by Sven Tennie at 2026-05-28T17:30:36-04:00 Add Haddock to FileSettings Helping to understand the fields' meanings without deeper analyses. - - - - - 4ce251e4 by Sylvain Henry at 2026-05-28T17:31:39-04:00 foundation test: skip signed minBound `quot` (-1) (#27222) `minBound `quot` (-1)` for fixed-width signed integers is platform dependent: the mathematical result -minBound is not representable in the type. On x86, IDIV traps; LLVM's sdiv is undefined behaviour in this case; on AArch64/RISC-V, SDIV wraps to minBound. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply(a)anthropic.com> - - - - - b8ba7e61 by Simon Jakobi at 2026-05-28T17:32:23-04:00 Prevent dictionary-passing in checkTyEqRhs ...by pre-specializing it to TcM. Previously, wherever checkTyEqRhs was used in other modules, the Core showed dictionary passing ($fMonadIOEnv). The added SPECIALIZE pragma prevents this. - - - - - 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> - - - - - 3db0b38c by Sven Tennie at 2026-06-07T16:53:57+00:00 testsuite: add GHC build-system regression detection tests Pin arch-specific GHC config values so that build-system refactors that accidentally change compiler configuration are caught by the testsuite. Two tests: - GhcInfoPins: runs ghc --info and checks 18 pinned fields - TestsuiteConfigPins: checks 12 Hadrian-supplied config.* values Both tests print a ready-to-paste entry when run on an unknown platform. Tests are Python run_command (not compiled Haskell) because wasm32/WASI targets cannot call runInteractiveProcess from compiled binaries. - - - - - 425 changed files: - .gitmodules - boot - + changelog.d/T26979 - + changelog.d/T27182.md - + changelog.d/T27202 - + changelog.d/T27261 - + changelog.d/bump-process - changelog.d/dynamic-trace-flags - + changelog.d/elem-via-foldr-27096 - + changelog.d/fix-blackhole-handling - + changelog.d/ghc-api-epa-parens - + changelog.d/ghc-pkg-faster-closure - + changelog.d/hadrian-system-cxx-std-lib-25303 - + changelog.d/ipe-event-class - + changelog.d/jobserver-leak-fix - + changelog.d/lib-add-tuple-tyfam-27179 - + changelog.d/libdir-setting - + changelog.d/module-graph-reuse-in-downsweep - + changelog.d/more-efficient-home-unit-imports-finding - + changelog.d/no-more-timer-signal - + changelog.d/remove-bignum-check-backend - + changelog.d/remove-bignum-ffi-backend - + changelog.d/rts_symlinks.md - + changelog.d/semaphore-v2 - + changelog.d/wasm-fix-serviceworker - 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testsuite/tests/ghci/prog020/ghci.prog020.stdout → testsuite/tests/ghci/prog020/ghci.prog020a.stdout - + testsuite/tests/ghci/prog020/ghci.prog020b.script - + testsuite/tests/ghci/prog020/ghci.prog020b.stderr - + testsuite/tests/ghci/prog020/ghci.prog020b.stdout - + testsuite/tests/ghci/prog023/Makefile - + testsuite/tests/ghci/prog023/all.T - + testsuite/tests/ghci/prog023/prog023a.script - + testsuite/tests/ghci/prog023/prog023a.stdout - + testsuite/tests/ghci/prog023/prog023b.script - + testsuite/tests/ghci/prog023/prog023b.stdout - + testsuite/tests/ghci/prog023/src/A.hs - + testsuite/tests/ghci/prog024/Makefile - + testsuite/tests/ghci/prog024/all.T - + testsuite/tests/ghci/prog024/prog024a.script - + testsuite/tests/ghci/prog024/prog024a.stdout - + testsuite/tests/ghci/prog024/prog024b.script - + testsuite/tests/ghci/prog024/prog024b.stdout - + testsuite/tests/ghci/prog024/prog024c.script - + testsuite/tests/ghci/prog024/prog024c.stderr - + testsuite/tests/ghci/prog024/prog024c.stdout - 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testsuite/tests/simplCore/should_compile/spec004.stderr - testsuite/tests/th/T24111.stdout - testsuite/tests/typecheck/should_compile/T13032.stderr - + testsuite/tests/typecheck/should_compile/T23135.hs - testsuite/tests/typecheck/should_compile/all.T - testsuite/tests/typecheck/should_compile/subsumption_sort_hole_fits.stderr - testsuite/tests/typecheck/should_fail/T21130.stderr - utils/check-exact/ExactPrint.hs - utils/check-exact/Main.hs - utils/ghc-pkg/Main.hs - utils/ghc-toolchain/exe/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/LaTeX.hs - utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs - utils/haddock/haddock-api/src/Haddock/Interface/RenameType.hs - utils/haddock/haddock-api/src/Haddock/Types.hs - utils/jsffi/prelude.mjs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/ba973f65f52302c0cc76db713f3020… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/ba973f65f52302c0cc76db713f3020… You're receiving this email because of your account on gitlab.haskell.org.

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[Git][ghc/ghc][wip/supersven/flags-pin-test] testsuite: simplify config-pins scripts
by Sven Tennie (＠supersven) 07 Jun '26

07 Jun '26

Sven Tennie pushed to branch wip/supersven/flags-pin-test at Glasgow Haskell Compiler / GHC Commits: ba973f65 by Sven Tennie at 2026-06-07T16:21:49+00:00 testsuite: simplify config-pins scripts - Extract platform_key() to ConfigPinsExpected.py; import in both scripts - Build actual dict directly in GhcInfoPins.py (drop list→dict roundtrip) - Add comment to all.T explaining why tests are Python not Haskell Co-Authored-By: Claude Sonnet 4.6 <noreply(a)anthropic.com> - - - - - 4 changed files: - testsuite/tests/driver/config-pins/ConfigPinsExpected.py - testsuite/tests/driver/config-pins/GhcInfoPins.py - testsuite/tests/driver/config-pins/TestsuiteConfigPins.py - testsuite/tests/driver/config-pins/all.T Changes: ===================================== testsuite/tests/driver/config-pins/ConfigPinsExpected.py ===================================== @@ -9,6 +9,14 @@ # # When a new platform is encountered the test prints a ready-to-paste entry. + +def platform_key(platform, is_cross, is_unreg, no_tntc): + key = platform + if is_cross: key += "-cross" + if is_unreg: key += "-unreg" + elif no_tntc: key += "-no_tntc" + return key + PINNED_GHC_INFO_FIELDS = [ "target arch", "target os", ===================================== testsuite/tests/driver/config-pins/GhcInfoPins.py ===================================== @@ -5,19 +5,16 @@ import subprocess import sys sys.path.insert(0, '.') -from ConfigPinsExpected import GHC_INFO_EXPECTED, PINNED_GHC_INFO_FIELDS +from ConfigPinsExpected import GHC_INFO_EXPECTED, PINNED_GHC_INFO_FIELDS, platform_key -def platform_key(info_map): - platform = info_map.get("target platform string", "<unknown>") - is_cross = info_map.get("cross compiling", "NO") == "YES" - is_unreg = info_map.get("Unregisterised", "NO") == "YES" - no_tntc = info_map.get("Tables next to code", "YES") == "NO" - key = platform - if is_cross: key += "-cross" - if is_unreg: key += "-unreg" - elif no_tntc: key += "-no_tntc" - return key +def info_platform_key(info_map): + return platform_key( + info_map.get("target platform string", "<unknown>"), + info_map.get("cross compiling", "NO") == "YES", + info_map.get("Unregisterised", "NO") == "YES", + info_map.get("Tables next to code", "YES") == "NO", + ) def main(): @@ -39,26 +36,25 @@ def main(): except (ValueError, SyntaxError) as e: print(f"Failed to parse {compiler!r} --info output: {e}") sys.exit(1) - key = platform_key(info_map) + key = info_platform_key(info_map) - actual = [(f, info_map.get(f, "<missing>")) for f in PINNED_GHC_INFO_FIELDS] + actual = {f: info_map.get(f, "<missing>") for f in PINNED_GHC_INFO_FIELDS} if key not in GHC_INFO_EXPECTED: print(f"Platform key {key!r} not in ConfigPinsExpected.") print("Add this entry to GHC_INFO_EXPECTED in ConfigPinsExpected.py:") print() print(f" {key!r}: {{") - for f, v in actual: + for f, v in actual.items(): print(f" {f!r}: {v!r},") print(" },") sys.exit(1) expected = GHC_INFO_EXPECTED[key] - actual_map = dict(actual) mismatches = [ - (f, ev, actual_map.get(f, "<missing>")) + (f, ev, actual.get(f, "<missing>")) for f, ev in sorted(expected.items()) - if ev != actual_map.get(f, "<missing>") + if ev != actual.get(f, "<missing>") ] if mismatches: ===================================== testsuite/tests/driver/config-pins/TestsuiteConfigPins.py ===================================== @@ -3,15 +3,7 @@ import sys sys.path.insert(0, '.') -from ConfigPinsExpected import TESTSUITE_CONFIG_EXPECTED - - -def platform_key(platform, is_cross, is_unreg, no_tntc): - key = platform - if is_cross: key += "-cross" - if is_unreg: key += "-unreg" - elif no_tntc: key += "-no_tntc" - return key +from ConfigPinsExpected import TESTSUITE_CONFIG_EXPECTED, platform_key def main(): ===================================== testsuite/tests/driver/config-pins/all.T ===================================== @@ -1,5 +1,9 @@ import sys +# Python run_command rather than compiled Haskell: wasm32/WASI targets cannot +# call runInteractiveProcess from compiled binaries (no process creation in +# WASI). Python scripts run on the host regardless of the target under test. + test('GhcInfoPins', [extra_files(['ConfigPinsExpected.py', 'GhcInfoPins.py']), ignore_stdout], View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/ba973f65f52302c0cc76db713f3020c… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/ba973f65f52302c0cc76db713f3020c… You're receiving this email because of your account on gitlab.haskell.org.

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