Alan Zimmerman pushed to branch wip/az/ghc-cpp at Glasgow Haskell Compiler / GHC Commits: 43b606bb by Florian Ragwitz at 2025-06-27T16:31:26-04:00 Tick uses of wildcard/pun field binds as if using the record selector function Fixes #17834. See Note [Record-selector ticks] for additional reasoning behind this as well as an overview of the implementation details and future improvements. - - - - - d4952549 by Ben Gamari at 2025-06-27T16:32:08-04:00 testsuite/caller-cc: Make CallerCc[123] less sensitive These were previously sensitive to irrelevant changes in program structure. To avoid this we filter out all by lines emitted by the -fcaller-cc from the profile. - - - - - 8d33d048 by Berk Özkütük at 2025-07-07T20:42:20-04:00 Consider `PromotedDataCon` in `tyConStupidTheta` Haddock checks data declarations for the stupid theta so as not to pretty-print them as empty contexts. Type data declarations end up as `PromotedDataCon`s by the time Haddock performs this check, causing a panic. This commit extends `tyConStupidTheta` so that it returns an empty list for `PromotedDataCon`s. This decision was guided by the fact that type data declarations never have data type contexts (see (R1) in Note [Type data declarations]). Fixes #25739. - - - - - a26243fd by Ryan Hendrickson at 2025-07-07T20:43:07-04:00 haddock: Document instances from other packages When attaching instances to `Interface`s, it isn't enough just to look for instances in the list of `Interface`s being processed. We also need to look in the modules on which they depend, including those outside of this package. Fixes #25147. Fixes #26079. - - - - - 0fb24420 by Rodrigo Mesquita at 2025-07-07T20:43:49-04:00 hadrian: Fallback logic for internal interpreter When determining whether to build the internal interpreter, the `make` build system had a fallback case for platforms not in the list of explicitly-supported operating systems and architectures. This fallback says we should try to build the internal interpreter if building dynamic GHC programs (if the architecture is unknown). Fixes #24098 - - - - - fe925bd4 by Ben Gamari at 2025-07-07T20:44:30-04:00 users-guide: Reference Wasm FFI section - - - - - 5856284b by Ben Gamari at 2025-07-07T20:44:30-04:00 users-guide: Fix too-short heading warning - - - - - a48dcdf3 by Duncan Coutts at 2025-07-07T20:45:18-04:00 Reorganise documentation for allocate* functions Consolodate interface information into the .h file, keeping just implementation details in the .c file. Use Notes stlye in the .h file and refer to notes from the .c file. - - - - - de5b528c by Duncan Coutts at 2025-07-07T20:45:18-04:00 Introduce common utilities for allocating arrays The intention is to share code among the several places that do this already. - - - - - b321319d by Duncan Coutts at 2025-07-07T20:45:18-04:00 Use new array alloc utils in Heap.c The CMM primop can now report heap overflow. - - - - - 1d557ffb by Duncan Coutts at 2025-07-07T20:45:18-04:00 Use new array alloc utils in ThreadLabels.c Replacing a local utility. - - - - - e59a1430 by Duncan Coutts at 2025-07-07T20:45:18-04:00 Use new array alloc utils in Threads.c Replacing local open coded version. - - - - - 482df1c9 by Duncan Coutts at 2025-07-07T20:45:18-04:00 Add exitHeapOverflow helper utility This will be useful with the array alloc functions, since unlike allocate/allocateMaybeFail, they do not come in two versions. So if it's not convenient to propagate failure, then one can use this. - - - - - 4d3ec8f9 by Duncan Coutts at 2025-07-07T20:45:18-04:00 Use new array alloc utils in Weak.c Also add a cpp macro CCS_SYSTEM_OR_NULL which does what it says. The benefit of this is that it allows us to referece CCS_SYSTEM even when we're not in PROFILING mode. That makes abstracting over profiling vs normal mode a lot easier. - - - - - 0c4f2fde by Duncan Coutts at 2025-07-07T20:45:18-04:00 Convert the array alloc primops to use the new array alloc utils - - - - - a3354ad9 by Duncan Coutts at 2025-07-07T20:45:18-04:00 While we're at it, add one missing 'likely' hint To a cmm primops that raises an exception, like the others now do. - - - - - 33b546bd by meooow25 at 2025-07-07T20:46:09-04:00 Keep scanl' strict in the head on rewrite `scanl'` forces elements to WHNF when the corresponding `(:)`s are forced. The rewrite rule for `scanl'` missed forcing the first element, which is fixed here with a `seq`. - - - - - 8a69196e by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00 debugger/rts: Allow toggling step-in per thread The RTS global flag `rts_stop_next_breakpoint` globally sets the interpreter to stop at the immediate next breakpoint. With this commit, single step mode can additionally be set per thread in the TSO flag (TSO_STOP_NEXT_BREAKPOINT). Being able to toggle "stop at next breakpoint" per thread is an important requirement for implementing "stepping out" of a function in a multi-threaded context. And, more generally, having a per-thread flag for single-stepping paves the way for multi-threaded debugging. That said, when we want to enable "single step" mode for the whole interpreted program we still want to stop at the immediate next breakpoint, whichever thread it belongs to. That's why we also keep the global `rts_stop_next_breakpoint` flag, with `rts_enableStopNextBreakpointAll` and `rts_disableStopNextBreakpointAll` helpers. Preparation for #26042 - - - - - 73d3f864 by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00 docs: Case continuation BCOs This commit documents a subtle interaction between frames for case BCOs and their parents frames. Namely, case continuation BCOs may refer to (non-local) variables that are part of the parent's frame. The note expanding a bit on these details is called [Case continuation BCOs] - - - - - d7aeddcf by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00 debugger: Implement step-out feature Implements support for stepping-out of a function (aka breaking right after returning from a function) in the interactive debugger. It also introduces a GHCi command :stepout to step-out of a function being debugged in the interpreter. The feature is described as: Stop at the first breakpoint immediately after returning from the current function scope. Known limitations: because a function tail-call does not push a stack frame, if step-out is used inside of a function that was tail-called, execution will not be returned to its caller, but rather its caller's first non-tail caller. On the other hand, it means the debugger follows the more realistic execution of the program. In the following example: .. code-block:: none f = do a b <--- (1) set breakpoint then step in here c b = do ... d <--- (2) step-into this tail call d = do ... something <--- (3) step-out here ... Stepping-out will stop execution at the `c` invokation in `f`, rather than stopping at `b`. The key idea is simple: When step-out is enabled, traverse the runtime stack until a continuation BCO is found -- and enable the breakpoint heading that BCO explicitly using its tick-index. The details are specified in `Note [Debugger: Step-out]` in `rts/Interpreter.c`. Since PUSH_ALTS BCOs (representing case continuations) were never headed by a breakpoint (unlike the case alternatives they push), we introduced the BRK_ALTS instruction to allow the debugger to set a case continuation to stop at the breakpoint heading the alternative that is taken. This is further described in `Note [Debugger: BRK_ALTS]`. Fixes #26042 - - - - - 5d9adf51 by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00 debugger: Filter step-out stops by SrcSpan To implement step-out, the RTS looks for the first continuation frame on the stack and explicitly enables its entry breakpoint. However, some continuations will be contained in the function from which step-out was initiated (trivial example is a case expression). Similarly to steplocal, we will filter the breakpoints at which the RTS yields to the debugger based on the SrcSpan. When doing step-out, only stop if the breakpoint is /not/ contained in the function from which we initiated it. This is especially relevant in monadic statements such as IO which is compiled to a long chain of case expressions. See Note [Debugger: Filtering step-out stops] - - - - - 7677adcc by Cheng Shao at 2025-07-08T07:40:29-04:00 compiler: make ModBreaks serializable - - - - - 14f67c6d by Rodrigo Mesquita at 2025-07-08T07:40:29-04:00 refactor: "Inspecting the session" moved from GHC Moved utilities for inspecting the session from the GHC module to GHC.Driver.Session.Inspect Purely a clean up - - - - - 9d3f484a by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Pass the HUG to readModBreaks, not HscEnv A minor cleanup. The associated history and setupBreakpoint functions are changed accordingly. - - - - - b595f713 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Move readModBreaks to GHC.Runtime.Interpreter With some small docs changes - - - - - d223227a by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Move interpreterProfiled to Interp.Types Moves interpreterProfiled and interpreterDynamic to GHC.Runtime.Interpreter.Types from GHC.Runtime.Interpreter. - - - - - 7fdd0a3d by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Don't import GHC in Debugger.Breakpoints Remove the top-level import GHC from GHC.Runtime.Debugger.Breakpoints This makes the module dependencies more granular and cleans up the qualified imports from the code. - - - - - 5e4da31b by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 refactor: Use BreakpointId in Core and Ifaces - - - - - 741ac3a8 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 stg2bc: Derive BcM via ReaderT StateT A small refactor that simplifies GHC.StgToByteCode by deriving-via the Monad instances for BcM. This is done along the lines of previous similar refactors like 72b54c0760bbf85be1f73c1a364d4701e5720465. - - - - - 0414fcc9 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 refact: Split InternalModBreaks out of ModBreaks There are currently two competing ways of referring to a Breakpoint: 1. Using the Tick module + Tick index 2. Using the Info module + Info index 1. The Tick index is allocated during desugaring in `mkModBreaks`. It is used to refer to a breakpoint associated to a Core Tick. For a given Tick module, there are N Ticks indexed by Tick index. 2. The Info index is allocated during code generation (in StgToByteCode) and uniquely identifies the breakpoints at runtime (and is indeed used to determine which breakpoint was hit at runtime). Why we need both is described by Note [Breakpoint identifiers]. For every info index we used to keep a `CgBreakInfo`, a datatype containing information relevant to ByteCode Generation, in `ModBreaks`. This commit splits out the `IntMap CgBreakInfo` out of `ModBreaks` into a new datatype `InternalModBreaks`. - The purpose is to separate the `ModBreaks` datatype, which stores data associated from tick-level information which is fixed after desugaring, from the unrelated `IntMap CgBreakInfo` information accumulated during bytecode generation. - We move `ModBreaks` to GHC.HsToCore.Breakpoints The new `InternalModBreaks` simply combines the `IntMap CgBreakInfo` with `ModBreaks`. After code generation we construct an `InternalModBreaks` with the `CgBreakInfo`s we accumulated and the existing `ModBreaks` and store that in the compiled BCO in `bc_breaks`. - Note that we previously only updated the `modBreaks_breakInfo` field of `ModBreaks` at this exact location, and then stored the updated `ModBreaks` in the same `bc_breaks`. - We put this new datatype in GHC.ByteCode.Breakpoints The rest of the pipeline for which CgBreakInfo is relevant is accordingly updated to also use `InternalModBreaks` - - - - - 2a097955 by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 cleanup: Use BreakpointIds in bytecode gen Small clean up to use BreakpointId and InternalBreakpointId more uniformly in bytecode generation rather than using Module + Ix pairs - - - - - 0515cc2f by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00 ghci: Allocate BreakArrays at link time only Previously, a BreakArray would be allocated with a slot for every tick in a module at `mkModBreaks`, in HsToCore. However, this approach has a few downsides: - It interleaves interpreter behaviour (allocating arrays for breakpoints) within the desugarer - It is inflexible in the sense it is impossible for the bytecode generator to add "internal" breakpoints that can be triggered at runtime, because those wouldn't have a source tick. (This is relevant for our intended implementation plan of step-out in #26042) - It ties the BreakArray indices to the *tick* indexes, while at runtime we would rather just have the *info* indexes (currently we have both because BreakArrays are indexed by the *tick* one). Paving the way for #26042 and #26064, this commit moves the allocation of BreakArrays to bytecode-loading time -- akin to what is done for CCS arrays. Since a BreakArray is allocated only when bytecode is linked, if a breakpoint is set (e.g. `:break 10`) before the bytecode is linked, there will exist no BreakArray to trigger the breakpoint in. Therefore, the function to allocate break arrays (`allocateBreakArrays`) is exposed and also used in GHC.Runtime.Eval to allocate a break array when a breakpoint is set, if it doesn't exist yet (in the linker env). - - - - - 8016561f by Simon Peyton Jones at 2025-07-08T07:41:13-04:00 Add a test for T26176 - - - - - 454cd682 by Simon Peyton Jones at 2025-07-08T07:41:13-04:00 Add test for #14010 This test started to work in GHC 9.6 and has worked since. This MR just adds a regression test - - - - - ea2c6673 by Teo Camarasu at 2025-07-08T13:24:43-04:00 Implement user-defined allocation limit handlers Allocation Limits allow killing a thread if they allocate more than a user-specified limit. We extend this feature to allow more versatile behaviour. - We allow not killing the thread if the limit is exceeded. - We allow setting a custom handler to be called when the limit is exceeded. User-specified allocation limit handlers run in a fresh thread and are passed the ThreadId of the thread that exceeded its limit. We introduce utility functions for getting and setting the allocation limits of other threads, so that users can reset the limit of a thread from a handler. Both of these are somewhat coarse-grained as we are unaware of the allocations in the current nursery chunk. We provide several examples of usages in testsuite/tests/rts/T22859.hs Resolves #22859 - - - - - 03e047f9 by Simon Hengel at 2025-07-08T13:25:25-04:00 Fix typo in using.rst - - - - - 67957854 by Ben Gamari at 2025-07-09T09:44:44-04:00 compiler: Import AnnotationWrapper from ghc-internal Since `GHC.Desugar` exported from `base` has been deprecated. - - - - - 813d99d6 by Ben Gamari at 2025-07-09T09:44:44-04:00 ghc-compact: Eliminate dependency on ghc-prim - - - - - 0ec952a1 by Ben Gamari at 2025-07-09T09:44:44-04:00 ghc-heap: Eliminate dependency on ghc-prim - - - - - 480074c3 by Ben Gamari at 2025-07-09T09:44:44-04:00 ghc-heap: Drop redundant import - - - - - 03455829 by Ben Gamari at 2025-07-09T09:44:45-04:00 ghc-prim: Bump version to 0.13.1 There are no interface changes from 0.13.0 but the implementation now lives in `ghc-internal`. - - - - - d315345a by Ben Gamari at 2025-07-09T09:44:45-04:00 template-haskell: Bump version number to 2.24.0.0 Bumps exceptions submodule. - - - - - 004c800e by Ben Gamari at 2025-07-09T09:44:45-04:00 Bump GHC version number to 9.14 - - - - - eb1a3816 by Ben Gamari at 2025-07-09T09:44:45-04:00 Bump parsec to 3.1.18.0 Bumps parsec submodule. - - - - - 86f83296 by Ben Gamari at 2025-07-09T09:44:45-04:00 unix: Bump to 2.8.7.0 Bumps unix submodule. - - - - - 89e13998 by Ben Gamari at 2025-07-09T09:44:45-04:00 binary: Bump to 0.8.9.3 Bumps binary submodule. - - - - - 55fff191 by Ben Gamari at 2025-07-09T09:44:45-04:00 Win32: Bump to 2.14.2.0 Bumps Win32 submodule. - - - - - 7dafa40c by Ben Gamari at 2025-07-09T09:44:45-04:00 base: Bump version to 4.22.0 Bumps various submodules. - - - - - ef03d8b8 by Rodrigo Mesquita at 2025-07-09T09:45:28-04:00 base: Export displayExceptionWithInfo This function should be exposed from base following CLC#285 Approved change in CLC#344 Fixes #26058 - - - - - 01d3154e by Wen Kokke at 2025-07-10T17:06:36+01:00 Fix documentation for HEAP_PROF_SAMPLE_STRING - - - - - ac259c48 by Wen Kokke at 2025-07-10T17:06:38+01:00 Fix documentation for HEAP_PROF_SAMPLE_COST_CENTRE - - - - - 2b4db9ba by Pi Delport at 2025-07-11T16:40:52-04:00 (Applicative docs typo: missing "one") - - - - - f707bab4 by Andreas Klebinger at 2025-07-12T14:56:16+01:00 Specialise: Improve specialisation by refactoring interestingDict This MR addresses #26051, which concerns missed type-class specialisation. The main payload of the MR is to completely refactor the key function `interestingDict` in GHC.Core.Opt.Specialise The main change is that we now also look at the structure of the dictionary we consider specializing on, rather than only the type. See the big `Note [Interesting dictionary arguments]` - - - - - ca7a9d42 by Simon Peyton Jones at 2025-07-12T14:56:16+01:00 Treat tuple dictionaries uniformly; don't unbox them See `Note [Do not unbox class dictionaries]` in DmdAnal.hs, sep (DNB1). This MR reverses the plan in #23398, which suggested a special case to unbox tuple dictionaries in worker/wrapper. But: - This was the cause of a pile of complexity in the specialiser (#26158) - Even with that complexity, specialision was still bad, very bad See https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297 And it's entirely unnecessary! Specialision works fine without unboxing tuple dictionaries. - - - - - be7296c9 by Andreas Klebinger at 2025-07-12T14:56:16+01:00 Remove complex special case from the type-class specialiser There was a pretty tricky special case in Specialise which is no longer necessary. * Historical Note [Floating dictionaries out of cases] * #26158 * #19747 https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297 This MR removes it. Hooray. - - - - - 4acf3a86 by Ben Gamari at 2025-07-15T05:46:32-04:00 configure: bump version to 9.15 - - - - - 45efaf71 by Teo Camarasu at 2025-07-15T05:47:13-04:00 rts/nonmovingGC: remove n_free We remove the nonmovingHeap.n_free variable. We wanted this to track the length of nonmovingHeap.free. But this isn't possible to do atomically. When this isn't accurate we can get a segfault by going past the end of the list. Instead, we just count the length of the list when we grab it in nonmovingPruneFreeSegment. Resolves #26186 - - - - - c635f164 by Ben Gamari at 2025-07-15T14:05:54-04:00 configure: Drop probing of ld.gold As noted in #25716, `gold` has been dropped from binutils-2.44. Fixes #25716. Metric Increase: size_hello_artifact_gzip size_hello_unicode_gzip ghc_prim_so - - - - - 637bb538 by Ben Gamari at 2025-07-15T14:05:55-04:00 testsuite/recomp015: Ignore stderr This is necessary since ld.bfd complains that we don't have a .note.GNU-stack section, potentially resulting in an executable stack. - - - - - d3cd4ec8 by Wen Kokke at 2025-07-15T14:06:39-04:00 Fix documentation for heap profile ID - - - - - 73082769 by Ben Gamari at 2025-07-15T16:56:38-04:00 Bump win32-tarballs to v0.9 - - - - - 3b63b254 by Ben Gamari at 2025-07-15T16:56:39-04:00 rts/LoadArchive: Handle null terminated string tables As of `llvm-ar` now emits filename tables terminated with null characters instead of the usual POSIX `/\n` sequence. Fixes #26150. - - - - - 195f6527 by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: rename label so name doesn't conflict with param - - - - - 63373b95 by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Handle API set symbol versioning conflicts - - - - - 48e9aa3e by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Mark API set symbols as HIDDEN and correct symbol type - - - - - 959e827a by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Implement WEAK EXTERNAL undef redirection by target symbol name - - - - - 65f19293 by Ben Gamari at 2025-07-15T16:56:39-04:00 rts/LoadArchive: Handle string table entries terminated with / llvm-ar appears to terminate string table entries with `/\n` [1]. This matters in the case of thin archives, since the filename is used. In the past this worked since `llvm-ar` would produce archives with "small" filenames when possible. However, now it appears to always use the string table. [1] https://github.com/llvm/llvm-project/blob/bfb686bb5ba503e9386dc899e1ebbe2488... - - - - - 9cbb3ef5 by Ben Gamari at 2025-07-15T16:56:39-04:00 testsuite: Mark T12497 as fixed Thanks to the LLVM toolchain update. Closes #22694. - - - - - 2854407e by Ben Gamari at 2025-07-15T16:56:39-04:00 testsuite: Accept new output of T11223_link_order_a_b_2_fail on Windows The archive member number changed due to the fact that llvm-ar now uses a string table. - - - - - 28439593 by Ben Gamari at 2025-07-15T16:56:39-04:00 rts/linker/PEi386: Implement IMAGE_REL_AMD64_SECREL This appears to now be used by libc++ as distributed by msys2. - - - - - 2b053755 by Tamar Christina at 2025-07-15T16:56:39-04:00 rts: Cleanup merge resolution residue in lookupSymbolInDLL_PEi386 and make safe without dependent - - - - - e8acd2e7 by Wen Kokke at 2025-07-16T08:37:04-04:00 Remove the `profile_id` parameter from various RTS functions. Various RTS functions took a `profile_id` parameter, intended to be used to distinguish parallel heap profile breakdowns (e.g., `-hT` and `-hi`). However, this feature was never implemented and the `profile_id` parameter was set to 0 throughout the RTS. This commit removes the parameter but leaves the hardcoded profile ID in the functions that emit the encoded eventlog events as to not change the protocol. The affected functions are `traceHeapProfBegin`, `postHeapProfBegin`, `traceHeapProfSampleString`, `postHeapProfSampleString`, `traceHeapProfSampleCostCentre`, and `postHeapProfSampleCostCentre`. - - - - - 76d392a2 by Wen Kokke at 2025-07-16T08:37:04-04:00 Make `traceHeapProfBegin` an init event. - - - - - bbaa44a7 by Peng Fan at 2025-07-16T16:50:42-04:00 NCG/LA64: Support finer-grained DBAR hints For LA664 and newer uarchs, they have made finer granularity hints available: Bit4: ordering or completion (0: completion, 1: ordering) Bit3: barrier for previous read (0: true, 1: false) Bit2: barrier for previous write (0: true, 1: false) Bit1: barrier for succeeding read (0: true, 1: false) Bit0: barrier for succeeding write (0: true, 1: false) And not affect the existing models because other hints are treated as 'dbar 0' there. - - - - - 7da86e16 by Andreas Klebinger at 2025-07-16T16:51:25-04:00 Disable -fprof-late-overloaded-calls for join points. Currently GHC considers cost centres as destructive to join contexts. Or in other words this is not considered valid: join f x = ... in ... -> scc<tick> jmp This makes the functionality of `-fprof-late-overloaded-calls` not feasible for join points in general. We used to try to work around this by putting the ticks on the rhs of the join point rather than around the jump. However beyond the loss of accuracy this was broken for recursive join points as we ended up with something like: rec-join f x = scc<tick> ... jmp f x Which similarly is not valid as the tick once again destroys the tail call. One might think we could limit ourselves to non-recursive tail calls and do something clever like: join f x = scc<tick> ... in ... jmp f x And sometimes this works! But sometimes the full rhs would look something like: join g x = .... join f x = scc<tick> ... -> jmp g x Which, would again no longer be valid. I believe in the long run we can make cost centre ticks non-destructive to join points. Or we could keep track of where we are/are not allowed to insert a cost centre. But in the short term I will simply disable the annotation of join calls under this flag. - - - - - 7ee22fd5 by ARATA Mizuki at 2025-07-17T06:05:30-04:00 x86 NCG: Better lowering for shuffleFloatX4# and shuffleDoubleX2# The new implementation * make use of specialized instructions like (V)UNPCK{L,H}{PS,PD}, and * do not require -mavx. Close #26096 Co-authored-by: sheaf - - - - - c6cd2da1 by Jappie Klooster at 2025-07-17T06:06:20-04:00 Update interact docs to explain about buffering We need to tell the user to set to the appropriate buffer format. Otherwise, this function may get randomly stuck, or just behave confusingly. issue: https://gitlab.haskell.org/ghc/ghc/-/issues/26131 NB, I'm running this with cabal *NOT* ghci. ghci messes with buffering anyway. ```haskell interaction :: String -> String interaction "jappie" = "hi" interaction "jakob" = "hello" interaction x = "unkown input: " <> x main :: IO () main = interact interaction ``` so in my input (prefixed by `>`) I get: ```

jappie unkown input: jappie

we confirmed later this was due to lack of \n matching.
Anyway movnig on to more unexpected stuff:

```haskell
main :: IO ()
main = do
  interact  (concatMap interaction . lines)

get's stuck forever. actually `^D` (ctrl+d) unstucks it and runs all input as expected. for example you can get: ```

sdfkds fakdsf unkown input: sdfkdsunkown input: fakdsf

This program works!
```haskell
interaction :: String -> String
interaction "jappie" = "hi \n"
interaction "jakob" = "hello \n"
interaction x = "unkown input: " <> x <> "\n"

main :: IO ()
main = do
  interact  (concatMap interaction . lines)

the reason is that linebuffering is set for both in and output by default. so lines eats the input lines, and all the \n postfixes make sure the buffer is put out. - - - - - 9fa590a6 by Zubin Duggal at 2025-07-17T06:07:03-04:00 fetch_gitlab: Ensure we copy users_guide.pdf and Haddock.pdf to the release docs directory Fixes #24093 - - - - - cc650b4b by Andrew Lelechenko at 2025-07-17T12:30:24-04:00 Add Data.List.NonEmpty.mapMaybe As per https://github.com/haskell/core-libraries-committee/issues/337 - - - - - 360fa82c by Duncan Coutts at 2025-07-17T12:31:14-04:00 base: Deprecate GHC.Weak.Finalize.runFinalizerBatch https://github.com/haskell/core-libraries-committee/issues/342 - - - - - f4e8466c by Alan Zimmerman at 2025-07-17T12:31:55-04:00 EPA: Update exact printing based on GHC 9.14 tests As a result of migrating the GHC ghc-9.14 branch tests to ghc-exactprint in https://github.com/alanz/ghc-exactprint/tree/ghc-9.14, a couple of discrepancies were picked up - The opening paren for a DefaultDecl was printed in the wrong place - The import declaration level specifiers were not printed. This commit adds those fixes, and some tests for them. The tests brought to light that the ImportDecl ppr instance had not been updated for level specifiers, so it updates that too. - - - - - 8b731e3c by Matthew Pickering at 2025-07-21T13:36:43-04:00 level imports: Fix infinite loop with cyclic module imports I didn't anticipate that downsweep would run before we checked for cyclic imports. Therefore we need to use the reachability function which handles cyclic graphs. Fixes #26087 - - - - - d751a9f1 by Pierre Thierry at 2025-07-21T13:37:28-04:00 Fix documentation about deriving from generics - - - - - f8d9d016 by Andrew Lelechenko at 2025-07-22T21:13:28-04:00 Fix issues with toRational for types capable to represent infinite and not-a-number values This commit fixes all of the following pitfalls:

toRational (read "Infinity" :: Double) 179769313486231590772930519078902473361797697894230657273430081157732675805500963132708477322407536021120113879871393357658789768814416622492847430639474124377767893424865485276302219601246094119453082952085005768838150682342462881473913110540827237163350510684586298239947245938479716304835356329624224137216 % 1 toRational (read "NaN" :: Double) 269653970229347386159395778618353710042696546841345985910145121736599013708251444699062715983611304031680170819807090036488184653221624933739271145959211186566651840137298227914453329401869141179179624428127508653257226023513694322210869665811240855745025766026879447359920868907719574457253034494436336205824 % 1

realToFrac (read "NaN" :: Double) -- With -O0 Infinity realToFrac (read "NaN" :: Double) -- With -O1 NaN

realToFrac (read "NaN" :: Double) :: CDouble Infinity realToFrac (read "NaN" :: CDouble) :: Double Infinity

Implements https://github.com/haskell/core-libraries-committee/issues/338 - - - - - 5dabc718 by Zubin Duggal at 2025-07-22T21:14:10-04:00 haddock: Don't warn about missing link destinations for derived names. Fixes #26114 - - - - - 9c3a0937 by Matthew Pickering at 2025-07-22T21:14:52-04:00 template haskell: use a precise condition when implicitly lifting Implicit lifting corrects a level error by replacing references to `x` with `$(lift x)`, therefore you can use a level `n` binding at level `n + 1`, if it can be lifted. Therefore, we now have a precise check that the use level is 1 more than the bind level. Before this bug was not observable as you only had 0 and 1 contexts but it is easily evident when using explicit level imports. Fixes #26088 - - - - - 5144b22f by Andreas Klebinger at 2025-07-22T21:15:34-04:00 Add since tag and more docs for do-clever-arg-eta-expansion Fixes #26113 - - - - - c865623b by Andreas Klebinger at 2025-07-22T21:15:34-04:00 Add since tag for -fexpose-overloaded-unfoldings Fixes #26112 - - - - - 49a44ab7 by Simon Hengel at 2025-07-23T17:59:55+07:00 Refactor GHC.Driver.Errors.printMessages - - - - - 84711c39 by Simon Hengel at 2025-07-23T18:27:34+07:00 Respect `-fdiagnostics-as-json` for error messages from pre-processors (fixes #25480) - - - - - d046b5ab by Simon Hengel at 2025-07-24T06:12:05-04:00 Include the rendered message in -fdiagnostics-as-json output This implements #26173. - - - - - d2b89603 by Ben Gamari at 2025-07-24T06:12:47-04:00 rts/Interpreter: Factor out ctoi tuple info tables into data Instead of a massive case let's put this into data which we can reuse elsewhere. - - - - - 4bc78496 by Sebastian Graf at 2025-07-24T16:19:34-04:00 CprAnal: Detect recursive newtypes (#25944) While `cprTransformDataConWork` handles recursive data con workers, it did not detect the case when a newtype is responsible for the recursion. This is now detected in the `Cast` case of `cprAnal`. The same reproducer made it clear that `isRecDataCon` lacked congruent handling for `AppTy` and `CastTy`, now fixed. Furthermore, the new repro case T25944 triggered this bug via an infinite loop in `cprFix`, caused by the infelicity in `isRecDataCon`. While it should be much less likely to trigger such an infinite loop now that `isRecDataCon` has been fixed, I made sure to abort the loop after 10 iterations and emitting a warning instead. Fixes #25944. - - - - - 0a583689 by Sylvain Henry at 2025-07-24T16:20:26-04:00 STM: don't create a transaction in the rhs of catchRetry# (#26028) We don't need to create a transaction for the rhs of (catchRetry#) because contrary to the lhs we don't need to abort it on retry. Moreover it is particularly harmful if we have code such as (#26028): let cN = readTVar vN >> retry tree = c1 `orElse` (c2 `orElse` (c3 `orElse` ...)) atomically tree Because it will stack transactions for the rhss and the read-sets of all the transactions will be iteratively merged in O(n^2) after the execution of the most nested retry. - - - - - a49eca26 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Renaming around predicate types .. we were (as it turned out) abstracting over type-class selectors in SPECIALISATION rules! Wibble isEqPred - - - - - f80375dd by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Refactor of Specialise.hs This patch just tidies up `specHeader` a bit, removing one of its many results, and adding some comments. No change in behaviour. Also add a few more `HasDebugCallStack` contexts. - - - - - 1bd12371 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Improve treatment of SPECIALISE pragmas -- again! This MR does another major refactor of the way that SPECIALISE pragmas work, to fix #26115, #26116, #26117. * We now /always/ solve forall-constraints in an all-or-nothing way. See Note [Solving a Wanted forall-constraint] in GHC.Tc.Solver.Solve This means we might have unsolved quantified constraints, which need to be reported. See `inert_insts` in `getUnsolvedInerts`. * I refactored the short-cut solver for type classes to work by recursively calling the solver rather than by having a little baby solver that kept being not clever enough. See Note [Shortcut solving] in GHC.Tc.Solver.Dict * I totally rewrote the desugaring of SPECIALISE pragmas, again. The new story is in Note [Desugaring new-form SPECIALISE pragmas] in GHC.HsToCore.Binds Both old-form and new-form SPECIALISE pragmas now route through the same function `dsSpec_help`. The tricky function `decomposeRuleLhs` is now used only for user-written RULES, not for SPECIALISE pragmas. * I improved `solveOneFromTheOther` to account for rewriter sets. Previously it would solve a non-rewritten dict from a rewritten one. For equalities we were already dealing with this, in Some incidental refactoring * A small refactor: `ebv_tcvs` in `EvBindsBar` now has a list of coercions, rather than a set of tyvars. We just delay taking the free vars. * GHC.Core.FVs.exprFVs now returns /all/ free vars. Use `exprLocalFVs` for Local vars. Reason: I wanted another variant for /evidence/ variables. * Ues `EvId` in preference to `EvVar`. (Evidence variables are always Ids.) Rename `isEvVar` to `isEvId`. * I moved `inert_safehask` out of `InertCans` and into `InertSet` where it more properly belongs. Compiler-perf changes: * There was a palpable bug (#26117) which this MR fixes in newWantedEvVar, which bypassed all the subtle overlapping-Given and shortcutting logic. (See the new `newWantedEvVar`.) Fixing this but leads to extra dictionary bindings; they are optimised away quickly but they made CoOpt_Read allocate 3.6% more. * Hpapily T15164 improves. * The net compiler-allocation change is 0.0% Metric Decrease: T15164 Metric Increase: CoOpt_Read T12425 - - - - - 953fd8f1 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Solve forall-constraints immediately, or not at all This MR refactors the constraint solver to solve forall-constraints immediately, rather than emitting an implication constraint to be solved later. The most immediate motivation was that when solving quantified constraints in SPECIALISE pragmas, we really really don't want to leave behind half- solved implications. Also it's in tune with the approach of the new short-cut solver, which recursively invokes the solver. It /also/ saves quite a bit of plumbing; e.g - The `wl_implics` field of `WorkList` is gone, - The types of `solveSimpleWanteds` and friends are simplified. - An EvFun contains binding, rather than an EvBindsVar ref-cell that will in the future contain bindings. That makes `evVarsOfTerm` simpler. Much nicer. It also improves error messages a bit. All described in Note [Solving a Wanted forall-constraint] in GHC.Tc.Solver.Solve. One tiresome point: in the tricky case of `inferConstraintsCoerceBased` we make a forall-constraint. This we /do/ want to partially solve, so we can infer a suitable context. (I'd be quite happy to force the user to write a context, bt I don't want to change behavior.) So we want to generate an /implication/ constraint in `emitPredSpecConstraints` rather than a /forall-constraint/ as we were doing before. Discussed in (WFA3) of the above Note. Incidental refactoring * `GHC.Tc.Deriv.Infer.inferConstraints` was consulting the state monad for the DerivEnv that the caller had just consulted. Nicer to pass it as an argument I think, so I have done that. No change in behaviour. - - - - - 6921ab42 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Remove duplicated code in Ast.hs for evTermFreeVars This is just a tidy up. - - - - - 1165f587 by Simon Peyton Jones at 2025-07-25T09:49:58+01:00 Small tc-tracing changes only - - - - - 0776ffe0 by Simon Hengel at 2025-07-26T04:54:20-04:00 Respect `-fdiagnostics-as-json` for core diagnostics (see #24113) - - - - - cc1116e0 by Andrew Lelechenko at 2025-07-26T04:55:01-04:00 docs: add since pragma to Data.List.NonEmpty.mapMaybe - - - - - ee2dc248 by Simon Hengel at 2025-07-31T06:25:35-04:00 Update comments on `OptKind` to reflect the code reality - - - - - b029633a by Wen Kokke at 2025-07-31T06:26:21-04:00 rts: Disable --eventlog-flush-interval unless compiled with -threaded. This commit fixes issue #26222: Using --eventlog-flush-interval with the non-threaded RTS leads to eventlog corruption. https://gitlab.haskell.org/ghc/ghc/-/issues/26222 This commit makes three changes when code is compiled against the non-threaded RTS: 1. It disables the --eventlog-flush-interval flag. 2. It disables the documentation for the --eventlog-flush-interval flag. 3. It disables the relevant state from RtsConfig and code from Timer. 4. It updates the entry for --eventlog-flush-interval in the users guide. - - - - - 31159f1d by Wen Kokke at 2025-07-31T06:26:21-04:00 rts: Split T20006 into tests with and without -threaded - - - - - 618687ef by Simon Hengel at 2025-07-31T06:27:03-04:00 docs/users_guide/win32-dlls.rst: Remove references to `readline` - - - - - 083e40f1 by Rodrigo Mesquita at 2025-08-01T04:38:23-04:00 debugger: Uniquely identify breakpoints by internal id Since b85b11994e0130ff2401dd4bbdf52330e0bcf776 (support inlining breakpoints), a breakpoint has been identified at runtime by *two* pairs of . - The first, aka a 'BreakpointId', uniquely identifies a breakpoint in the source of a module by using the Tick index. A Tick index can index into ModBreaks.modBreaks_xxx to fetch source-level information about where that tick originated. - When a user specifies e.g. a line breakpoint using :break, we'll reverse engineer what a Tick index for that line - We update the `BreakArray` of that module (got from the LoaderState) at that tick index to `breakOn`. - A BCO we can stop at is headed by a BRK_FUN instruction. This instruction stores in an operand the `tick index` it is associated to. We look it up in the associated `BreakArray` (also an operand) and check wheter it was set to `breakOn`. - The second, aka the `ibi_info_mod` + `ibi_info_ix` of the `InternalBreakpointId`, uniquely index into the `imodBreaks_breakInfo` -- the information we gathered during code generation about the existing breakpoint *ocurrences*. - Note that with optimisation there may be many occurrences of the same source-tick-breakpoint across different modules. The `ibi_info_ix` is unique per occurrence, but the `bi_tick_ix` may be shared. See Note [Breakpoint identifiers] about this. - Note that besides the tick ids, info ids are also stored in `BRK_FUN` so the break handler can refer to the associated `CgBreakInfo`. In light of that, the driving changes come from the desire to have the info_id uniquely identify the breakpoint at runtime, and the source tick id being derived from it: - An InternalBreakpointId should uniquely identify a breakpoint just from the code-generation identifiers of `ibi_info_ix` and `ibi_info_mod`. So we drop `ibi_tick_mod` and `ibi_tick_ix`. - A BRK_FUN instruction need only record the "internal breakpoint id", not the tick-level id. So we drop the tick mod and tick index operands. - A BreakArray should be indexed by InternalBreakpointId rather than BreakpointId That means we need to do some more work when setting a breakpoint. Specifically, we need to figure out the internal ids (occurrences of a breakpoint) from the source-level BreakpointId we want to set the breakpoint at (recall :break refers to breaks at the source level). Besides this change being an improvement to the handling of breakpoints (it's clearer to have a single unique identifier than two competing ones), it unlocks the possibility of generating "internal" breakpoints during Cg (needed for #26042). It should also be easier to introduce multi-threaded-aware `BreakArrays` following this change (needed for #26064). Se also the new Note [ModBreaks vs InternalModBreaks] On i386-linux: ------------------------- Metric Decrease: interpreter_steplocal ------------------------- - - - - - bf03bbaa by Simon Hengel at 2025-08-01T04:39:05-04:00 Don't use MCDiagnostic for `ghcExit` This changes the error message of `ghcExit` from ``` <no location info>: error: Compilation had errors ``` to ``` Compilation had errors ``` - - - - - a889ec75 by Simon Hengel at 2025-08-01T04:39:05-04:00 Respect `-fdiagnostics-as-json` for driver diagnostics (see #24113) - - - - - 81577fe7 by Ben Gamari at 2025-08-02T04:29:39-04:00 configure: Allow override of CrossCompiling As noted in #26236, the current inference logic is a bit simplistic. In particular, there are many cases (e.g. building for a new libc) where the target and host triples may differ yet we are still able to run the produced artifacts as native code. Closes #26236. - - - - - 01136779 by Andreas Klebinger at 2025-08-02T04:30:20-04:00 rts: Support COFF BigObj files in archives. - - - - - 1f9e4f54 by Stephen Morgan at 2025-08-03T15:14:08+10:00 refactor: Modify Data.List.sortOn to use (>) instead of compare. (#26184) This lets a more efficient (>) operation be used if one exists. This is technically a breaking change for malformed Ord instances, where x > y is not equivalent to compare x y == GT. Discussed by the CLC in issue #332: https://github.com/haskell/core-libraries-committee/issues/332 - - - - - 4f6bc9cf by fendor at 2025-08-04T17:50:06-04:00 Revert "base: Expose Backtraces constructor and fields" This reverts commit 17db44c5b32fff82ea988fa4f1a233d1a27bdf57. - - - - - bcdec657 by Zubin Duggal at 2025-08-05T10:37:29+05:30 compiler: Export a version of `newNameCache` that is not prone to footguns. `newNameCache` must be initialized with both a non-"reserved" unique tag, as well as a list of known key names. Failing to do so results in hard to debug unique conflicts. It is difficult for API users to tell which unique tags are safe to use. So instead of leaving this up to the user to decide, we now export a version of `newNameCache` which uses a guaranteed non-reserved unique tag. In fact, this is now the way the unique tag is initialized for all invocations of the compiler. The original version of `newNameCache` is now exported as `newNameCache'` for advanced users. We also deprecate `initNameCache` as it is also prone to footguns and is completely subsumed in functionality by `newNameCache` and `newNameCache'`. Fixes #26135 and #26055 - - - - - 57d3b4a8 by Andrew Lelechenko at 2025-08-05T18:36:31-04:00 hadrian: bump Stackage snapshot to LTS 24.2 / GHC 9.10.2 In line with #25693 we should use GHC 9.10 as a boot compiler, while Hadrian stack.yaml was stuck on GHC 9.6. - - - - - c2a78cea by Peng Fan at 2025-08-05T18:37:27-04:00 NCG/LA64: implement atomic write with finer-grained DBAR hints Signed-off-by: Peng Fan - - - - - 95231c8e by Teo Camarasu at 2025-08-06T08:35:58-04:00 CODEOWNERS: add CLC as codeowner of base We also remove hvr, since I think he is no longer active - - - - - 77df0ded by Andrew Lelechenko at 2025-08-06T08:36:39-04:00 Bump submodule text to 2.1.3 - - - - - 8af260d0 by Nikolaos Chatzikonstantinou at 2025-08-06T08:37:23-04:00 docs: fix internal import in getopt examples This external-facing doc example shouldn't mention GHC internals when using 'fromMaybe'. - - - - - 69cc16ca by Marc Scholten at 2025-08-06T15:51:28-04:00 README: Add note on ghc.nix - - - - - 93a2f450 by Daniel Díaz at 2025-08-06T15:52:14-04:00 Link to the "Strict Bindings" docs from the linear types docs Strict Bidings are relevant for the kinds of multiplicity annotations linear lets support. - - - - - 246b7853 by Matthew Pickering at 2025-08-07T06:58:30-04:00 level imports: Check the level of exported identifiers The level imports specification states that exported identifiers have to be at level 0. This patch adds the requird level checks that all explicitly mentioned identifiers occur at level 0. For implicit export specifications (T(..) and module B), only level 0 identifiers are selected for re-export. ghc-proposal: https://github.com/ghc-proposals/ghc-proposals/pull/705 Fixes #26090 - - - - - 358bc4fc by fendor at 2025-08-07T06:59:12-04:00 Bump GHC on darwin CI to 9.10.1 - - - - - 1903ae35 by Matthew Pickering at 2025-08-07T12:21:10+01:00 ipe: Place strings and metadata into specific .ipe section By placing the .ipe metadata into a specific section it can be stripped from the final binary if desired. ``` objcopy --remove-section .ipe <binary> upx <binary> ``` Towards #21766 - - - - - c80dd91c by Matthew Pickering at 2025-08-07T12:22:42+01:00 ipe: Place magic word at the start of entries in the .ipe section The magic word "IPE\nIPE\n" is placed at the start of .ipe sections, then if the section is stripped, we can check whether the section starts with the magic word or not to determine whether there is metadata present or not. Towards #21766 - - - - - cab42666 by Matthew Pickering at 2025-08-07T12:22:42+01:00 ipe: Use stable IDs for IPE entries IPEs have historically been indexed and reported by their address. This makes it impossible to compare profiles between runs, since the addresses may change (due to ASLR) and also makes it tricky to separate out the IPE map from the binary. This small patch adds a stable identifier for each IPE entry. The stable identifier is a single 64 bit word. The high-bits are a per-module identifier and the low bits identify which entry in each module. 1. When a node is added into the IPE buffer it is assigned a unique identifier from an incrementing global counter. 2. Each entry already has an index by it's position in the `IpeBufferListNode`. The two are combined together by the `IPE_ENTRY_KEY` macro. Info table profiling uses the stable identifier rather than the address of the info table. The benefits of this change are: * Profiles from different runs can be easily compared * The metadata can be extracted from the binary (via the eventlog for example) and then stripped from the executable. Fixes #21766 - - - - - 2860a9a5 by Simon Peyton Jones at 2025-08-07T20:29:18-04:00 In TcSShortCut, typechecker plugins should get empty Givens Solving in TcShortCut mode means /ignoring the Givens/. So we should not pass them to typechecker plugins! Fixes #26258. This is a fixup to the earlier MR: commit 1bd12371feacc52394a0e660ef9349f9e8ee1c06 Author: Simon Peyton Jones Date: Mon Jul 21 10:04:49 2025 +0100 Improve treatment of SPECIALISE pragmas -- again! - - - - - 2157db2d by sterni at 2025-08-08T15:32:39-04:00 hadrian: enable terminfo if --with-curses-* flags are given The GHC make build system used to support WITH_TERMINFO in ghc.mk which allowed controlling whether to build GHC with terminfo or not. hadrian has replaced this with a system where this is effectively controlled by the cross-compiling setting (the default WITH_TERMINFO value was bassed on CrossCompiling, iirc). This behavior is undesireable in some cases and there is not really a good way to work around it. Especially for downstream packagers, modifying this via UserSettings is not really feasible since such a source file has to be kept in sync with Settings/Default.hs manually since it can't import Settings.Default or any predefined Flavour definitions. To avoid having to add a new setting to cfg/system.config and/or a new configure flag (though I'm happy to implement both if required), I've chosen to take --with-curses-* being set explicitly as an indication that the user wants to have terminfo enabled. This would work for Nixpkgs which sets these flags [1] as well as haskell.nix [2] (which goes to some extreme measures [3] [4] to force terminfo in all scenarios). In general, I'm an advocate for making the GHC build be the same for native and cross insofar it is possible since it makes packaging GHC and Haskell related things while still supporting cross much less compilicated. A more minimal GHC with reduced dependencies should probably be a specific flavor, not the default. Partially addresses #26288 by forcing terminfo to be built if the user explicitly passes configure flags related to it. However, it isn't built by default when cross-compiling yet nor is there an explicit way to control the package being built. [1]: https://github.com/NixOS/nixpkgs/blob/3a7266fcefcb9ce353df49ba3f292d06443760... [2]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4... [3]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4... [4]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4... - - - - - b3c31488 by David Feuer at 2025-08-08T15:33:21-04:00 Add default QuasiQuoters Add `defaultQuasiQuoter` and `namedDefaultQuasiQuoter` to make it easier to write `QuasiQuoters` that give helpful error messages when they're used in inappropriate contexts. Closes #24434. - - - - - 03555ed8 by Sylvain Henry at 2025-08-10T22:20:57-04:00 Handle non-fractional CmmFloats in Cmm's CBE (#26229) Since f8d9d016305be355f518c141f6c6d4826f2de9a2, toRational for Float and Double converts float's infinity and NaN into Rational's infinity and NaN (respectively 1%0 and 0%0). Cmm CommonBlockEliminator hashing function needs to take these values into account as they can appear as literals now. See added testcase. - - - - - 6c956af3 by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00 Fix extensions list in `DoAndIfThenElse` docs - - - - - 6dc420b1 by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00 Document status of `RelaxedPolyRec` extension This adds a brief extension page explaining the status of the `RelaxedPolyRec` extension. The behaviour of this mode is already explained elsewhere, so this page is mainly for completeness so that various lists of extensions have somewhere to point to for this flag. Fixes #18630 - - - - - 18036d52 by Simon Peyton Jones at 2025-08-11T11:31:20-04:00 Take more care in zonkEqTypes on AppTy/AppTy This patch fixes #26256. See Note [zonkEqTypes and the PKTI] in GHC.Tc.Solver.Equality - - - - - c8d76a29 by Zubin Duggal at 2025-08-11T11:32:02-04:00 ci: upgrade bootstrap compiler on windows to 9.10.1 - - - - - 34fc50c1 by Ben Gamari at 2025-08-11T13:36:25-04:00 Kill IOPort# This type is unnecessary, having been superceded by `MVar` and a rework of WinIO's blocking logic. See #20947. See https://github.com/haskell/core-libraries-committee/issues/213. - - - - - 56b32c5a by sheaf at 2025-08-12T10:00:19-04:00 Improve deep subsumption This commit improves the DeepSubsumption sub-typing implementation in GHC.Tc.Utils.Unify.tc_sub_type_deep by being less eager to fall back to unification. For example, we now are properly able to prove the subtyping relationship ((∀ a. a->a) -> Int) -> Bool <= β[tau] Bool for an unfilled metavariable β. In this case (with an AppTy on the right), we used to fall back to unification. No longer: now, given that the LHS is a FunTy and that the RHS is a deep rho type (does not need any instantiation), we try to make the RHS into a FunTy, viz. β := (->) γ We can then continue using covariance & contravariance of the function arrow, which allows us to prove the subtyping relationship, instead of trying to unify which would cause us to error out with: Couldn't match expected type ‘β’ with actual type ‘(->) ((∀ a. a -> a) -> Int) See Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify. The other main improvement in this patch concerns type inference. The main subsumption logic happens (before & after this patch) in GHC.Tc.Gen.App.checkResultTy. However, before this patch, all of the DeepSubsumption logic only kicked in in 'check' mode, not in 'infer' mode. This patch adds deep instantiation in the 'infer' mode of checkResultTy when we are doing deep subsumption, which allows us to accept programs such as: f :: Int -> (forall a. a->a) g :: Int -> Bool -> Bool test1 b = case b of True -> f False -> g test2 b = case b of True -> g False -> f See Note [Deeply instantiate in checkResultTy when inferring]. Finally, we add representation-polymorphism checks to ensure that the lambda abstractions we introduce when doing subsumption obey the representation polymorphism invariants of Note [Representation polymorphism invariants] in GHC.Core. See Note [FunTy vs FunTy case in tc_sub_type_deep]. This is accompanied by a courtesy change to `(<.>) :: HsWrapper -> HsWrapper -> HsWrapper`, adding the equation: WpCast c1 <.> WpCast c2 = WpCast (c1 `mkTransCo` c2) This is useful because mkWpFun does not introduce an eta-expansion when both of the argument & result wrappers are casts; so this change allows us to avoid introducing lambda abstractions when casts suffice. Fixes #26225 - - - - - d175aff8 by Sylvain Henry at 2025-08-12T10:01:31-04:00 Add regression test for #18619 - - - - - a3983a26 by Sylvain Henry at 2025-08-12T10:02:20-04:00 RTS: remove some TSAN annotations (#20464) Use RELAXED_LOAD_ALWAYS macro instead. - - - - - 0434af81 by Ben Gamari at 2025-08-12T10:03:02-04:00 Bump time submodule to 1.15 Also required bumps of Cabal, directory, and hpc. - - - - - 62899117 by Florian Ragwitz at 2025-08-13T21:01:34-04:00 Extend record-selector usage ticking to all binds using a record field This extends the previous handling of ticking for RecordWildCards and NamedFieldPuns to all var bindings that involve record selectors. Note that certain patterns such as `Foo{foo = 42}` will currently not tick the `foo` selector, as ticking is triggered by `HsVar`s. Closes #26191. - - - - - b37b3af7 by Florian Ragwitz at 2025-08-13T21:01:34-04:00 Add release notes for 9.16.1 and move description of latest HPC changes there. - - - - - a5e4b7d9 by Ben Gamari at 2025-08-13T21:02:18-04:00 rts: Clarify rationale for undefined atomic wrappers Since c06e3f46d24ef69f3a3d794f5f604cb8c2a40cbc the RTS has declared various atomic operation wrappers defined by ghc-internal as undefined. While the rationale for this isn't clear from the commit message, I believe that this is necessary due to the unregisterised backend. Specifically, the code generator will reference these symbols when compiling RTS Cmm sources. - - - - - 50842f83 by Andreas Klebinger at 2025-08-13T21:03:01-04:00 Make unexpected LLVM versions a warning rather than an error. Typically a newer LLVM version *will* work so erroring out if a user uses a newer LLVM version is too aggressive. Fixes #25915 - - - - - c91e2650 by fendor at 2025-08-13T21:03:43-04:00 Store `StackTrace` and `StackSnapshot` in `Backtraces` Instead of decoding the stack traces when collecting the `Backtraces`, defer this decoding until actually showing the `Backtraces`. This allows users to customise how `Backtraces` are displayed by using a custom implementation of `displayExceptionWithInfo`, overwriting the default implementation for `Backtraces` (`displayBacktraces`). - - - - - dee28cdd by fendor at 2025-08-13T21:03:43-04:00 Allow users to customise the collection of exception annotations Add a global `CollectExceptionAnnotationMechanism` which determines how `ExceptionAnnotation`s are collected upon throwing an `Exception`. This API is exposed via `ghc-experimental`. By overriding how we collect `Backtraces`, we can control how the `Backtraces` are displayed to the user by newtyping `Backtraces` and giving a different instance for `ExceptionAnnotation`. A concrete use-case for this feature is allowing us to experiment with alternative stack decoders, without having to modify `base`, which take additional information from the stack frames. This commit does not modify how `Backtraces` are currently collected or displayed. - - - - - 66024722 by fendor at 2025-08-13T21:03:43-04:00 Expose Backtraces internals from ghc-experimental Additionally, expose the same API `base:Control.Exception.Backtrace` to make it easier to use as a drop-in replacement. - - - - - a766286f by Reed Mullanix at 2025-08-13T21:04:36-04:00 ghc-internal: Fix naturalAndNot for NB/NS case When the first argument to `naturalAndNot` is larger than a `Word` and the second is `Word`-sized, `naturalAndNot` will truncate the result: ```

...

...

naturalAndNot ((2 ^ 65) .|. (2 ^ 3)) (2 ^ 3) 0

In contrast, `naturalAndNot` does not truncate when both arguments are larger than a `Word`, so this appears to be a bug.
Luckily, the fix is pretty easy: we just need to call `bigNatAndNotWord#` instead of truncating.

Fixes #26230

- - - - -
3506fa7d by Simon Hengel at 2025-08-13T21:05:18-04:00
Report -pgms as a deprecated flag

(instead of reporting an unspecific warning)

Before:

    on the commandline: warning:
        Object splitting was removed in GHC 8.8

After:

    on the commandline: warning: [GHC-53692] [-Wdeprecated-flags]
        -pgms is deprecated: Object splitting was removed in GHC 8.8

- - - - -
51c701fe by Zubin Duggal at 2025-08-13T21:06:00-04:00
testsuite: Be more permissive when filtering out GNU_PROPERTY_TYPE linker warnings

The warning text is slightly different with ld.bfd.

Fixes #26249

- - - - -
dfe6f464 by Simon Hengel at 2025-08-13T21:06:43-04:00
Refactoring: Don't misuse `MCDiagnostic` for lint messages

`MCDiagnostic` is meant to be used for compiler diagnostics.

Any code that creates `MCDiagnostic` directly, without going through
`GHC.Driver.Errors.printMessage`, side steps `-fdiagnostics-as-json`
(see e.g. !14475, !14492 !14548).

To avoid this in the future I want to control more narrowly who creates
`MCDiagnostic` (see #24113).

Some parts of the compiler use `MCDiagnostic` purely for formatting
purposes, without creating any real compiler diagnostics.  This change
introduces a helper function, `formatDiagnostic`, that can be used in
such cases instead of constructing `MCDiagnostic`.

- - - - -
a8b2fbae by Teo Camarasu at 2025-08-13T21:07:24-04:00
rts: ensure MessageBlackHole.link is always a valid closure

We turn a MessageBlackHole into an StgInd in wakeBlockingQueue().
Therefore it's important that the link field, which becomes the
indirection field, always points to a valid closure.

It's unclear whether it's currently possible for the previous behaviour
to lead to a crash, but it's good to be consistent about this invariant nonetheless.

Co-authored-by: Andreas Klebinger <klebinger.andreas@gmx.at>

- - - - -
4021181e by Teo Camarasu at 2025-08-13T21:07:24-04:00
rts: spin if we see a WHITEHOLE in messageBlackHole

When a BLACKHOLE gets cancelled in raiseAsync, we indirect to a THUNK.
GC can then shortcut this, replacing our BLACKHOLE with a fresh THUNK.

This THUNK is not guaranteed to have a valid indirectee field.

If at the same time, a message intended for the previous BLACKHOLE is
processed and concurrently we BLACKHOLE the THUNK, thus temporarily
turning it into a WHITEHOLE, we can get a segfault, since we look at the
undefined indirectee field of the THUNK

The fix is simple: spin if we see a WHITEHOLE, and it will soon be
replaced with a valid BLACKHOLE.

Resolves #26205

- - - - -
1107af89 by Oleg Grenrus at 2025-08-13T21:08:06-04:00
Allow defining HasField instances for naughty fields

Resolves #26295

... as HasField solver doesn't solve for fields with "naughty"
selectors, we could as well allow defining HasField instances for these
fields.

- - - - -
020e7587 by Sylvain Henry at 2025-08-13T21:09:00-04:00
Fix Data.List unqualified import warning

- - - - -
fd811ded by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Make injecting implicit bindings into its own pass

Previously we were injecting "impliicit bindings" (data constructor
worker and wrappers etc)

  - both at the end of CoreTidy,
  - and at the start of CorePrep

This is unpleasant and confusing.  This patch puts it it its own pass,
addImplicitBinds, which runs between the two.

The function `GHC.CoreToStg.AddImplicitBinds.addImplicitBinds` now takes /all/
TyCons, not just the ones for algebraic data types.  That change ripples
through to
     - corePrepPgm
     - doCodeGen
     - byteCodeGen
All take [TyCon] which includes all TyCons

- - - - -
9bd7fcc5 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Implement unary classes

The big change is described exhaustively in

   Note [Unary class magic] in GHC.Core.TyCon

Other changes

* We never unbox class dictionaries in worker/wrapper.  This has been true for some
  time now, but the logic is now centralised in functions in
  GHC.Core.Opt.WorkWrap.Utils, namely `canUnboxTyCon`, and `canUnboxArg`
  See Note [Do not unbox class dictionaries] in GHC.Core.Opt.WorkWrap.Utils.

* Refactored the `notWorthFloating` logic in GHc.Core.Opt.SetLevels.
  I can't remember if I actually changed any behaviour here, but if so it's
  only in a corner cases.

* Fixed a bug in `GHC.Core.TyCon.isEnumerationTyCon`, which was wrongly returning
  True for (##).

* Remove redundant Role argument to `liftCoSubstWithEx`.  It was always
  Representational.

* I refactored evidence generation in the constraint solver:
  * Made GHC.Tc.Types.Evidence contain better abstactions for evidence
    generation.
  * I deleted the file `GHC.Tc.Types.EvTerm` and merged its (small) contents
    elsewhere. It wasn't paying its way.
  * Made evidence for implicit parameters go via a proper abstraction.

* Fix inlineBoringOk; see (IB6) in Note [inlineBoringOk]
  This fixes a slowdown in `countdownEffectfulDynLocal`
  in the `effectful` library.

Smaller things

* Rename `isDataTyCon` to `isBoxedDataTyCon`.
* GHC.Core.Corecion.liftCoSubstWithEx was only called with Representational role,
  so I baked that into the function and removed the argument.
* Get rid of `GHC.Core.TyCon.tyConSingleAlgDataCon_maybe` in favour of calling
  `not isNewTyCon` at the call sites; more explicit.
* Refatored `GHC.Core.TyCon.isInjectiveTyCon`; but I don't think I changed its
  behaviour
* Moved `decomposeIPPred` to GHC.Core.Predicate

Compile time performance changes:
  geo. mean        +0.1%
    minimum        -6.8%
    maximum       +14.4%

The +14% one is in T21839c, where it seems that a bit more inlining
is taking place.  That seems acceptable; and the average change is small

Metric Decrease:
    LargeRecord
    T12227
    T12707
    T16577
    T21839r
    T5642
Metric Increase:
    T15164
    T21839c
    T3294
    T5321FD
    T5321Fun
    WWRec

- - - - -
b4075d71 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Slight improvement to pre/postInlineUnconditionally

Avoids an extra simplifier iteration

- - - - -
9e443596 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Fix a long-standing assertion error in normSplitTyConApp_maybe

- - - - -
91310ad0 by Simon Peyton Jones at 2025-08-14T17:56:47-04:00
Add comment to coercion optimiser

- - - - -
5b841d82 by Teo Camarasu at 2025-08-14T17:57:56-04:00
template-haskell: move some identifiers from ghc-internal to template-haskell

These identifiers are not used internally by the compiler. Therefore we
have no reason for them to be in ghc-internal.

By moving them to template-haskell, we benefit from it being easier to
change them and we avoid having to build them in stage0.

Resolves #26048

- - - - -
33e2c7e5 by Teo Camarasu at 2025-08-14T17:57:56-04:00
template-haskell: transfer $infix note to public module

This Haddock note should be in the public facing module

- - - - -
2a411fc4 by Sylvain Henry at 2025-08-14T17:59:09-04:00
JS: export HEAP8 symbol (#26290)

Newer Emscripten requires this.

- - - - -
248f78ca by Ben Gamari at 2025-08-14T17:59:51-04:00
users-guide: Drop the THREAD_RUNNABLE event

As of f361281c89fbce42865d8b8b27b0957205366186 it is no longer emitted.
- - - - -
706d33e3 by Recursion Ninja at 2025-08-15T04:12:12-04:00
Resolving issues #20645 and #26109

Correctly sign extending and casting smaller bit width types for LLVM operations:

  - bitReverse8#
  - bitReverse16#
  - bitReverse32#
  - byteSwap16#
  - byteSwap32#
  - pdep8#
  - pdep16#
  - pext8#
  - pext16#

- - - - -
1cdc6f46 by Cheng Shao at 2025-08-15T04:12:56-04:00
hadrian: enforce have_llvm=False for wasm32/js

This patch fixes hadrian to always pass have_llvm=False to the
testsuite driver for wasm32/js targets. These targets don't really
support the LLVM backend, and the optllvm test way doesn't work. We
used to special-case wasm32/js to avoid auto-adding optllvm way in
testsuite/config/ghc, but this is still problematic if someone writes
a new LLVM-related test and uses something like when(have_llvm(),
extra_ways(["optllvm"])). So better just enforce have_llvm=False for
these targets here.

- - - - -
ca03226d by Ben Gamari at 2025-08-18T13:43:20+00:00
configure: Allow use of LLVM 20
- - - - -
783cd7d6 by Cheng Shao at 2025-08-18T20:13:14-04:00
compiler: use `UniqMap` instead of `Map` for `BCEnv` in bytecode compiler

The bytecode compiler maintains a `BCEnv` which was previously `Map Id
StackDepth`. Given `Id` is `Uniquable`, we might as well use `UniqMap`
here as a more efficient data structure, hence this patch.

Co-authored-by: Codex <codex@openai.com>

- - - - -
58e46da9 by fendor at 2025-08-18T20:13:56-04:00
rts: Strip lower three bits when hashing Word instead of lower eight bits

- - - - -
45dbfa23 by Cheng Shao at 2025-08-18T20:14:37-04:00
libffi: update to 3.5.2

Bumps libffi submodule.

- - - - -
54be78ef by Ben Gamari at 2025-08-19T16:28:05-04:00
testsuite: Fix T20006b

This test is supposed to fail for non-threaded ways yet it
was previously marked as only failing in `normal`.
Fix this.
- - - - -
f4bac607 by Simon Peyton Jones at 2025-08-19T16:28:47-04:00
Take yet more care with reporting redundant constraints

This small patch fixes #25992, which relates to reporting redundant
constraints on default-method declarations.

See (TRC5) in Note [Tracking redundant constraints]

- - - - -
ab130fec by fendor at 2025-08-19T16:29:29-04:00
Bump dependencies of hadrian-bootstrap-gen to use GHC 9.6.7

- - - - -
6d02ac6f by fendor at 2025-08-19T16:29:29-04:00
Bump required GHC version for test-bootstrap jobs to 9.10.1

Include test-bootstrap job for GHC 9.12.2.

Update hadrian bootstrap plans use GHC 9.10 and 9.12

Remove older GHC bootstrap configurations.
We require at least GHC 9.10.1 to build GHC.

Adds plans for:

* 9.10.1
* 9.10.2
* 9.12.1
* 9.12.2

- - - - -
9e857171 by Brandon Chinn at 2025-08-20T11:47:46-04:00
Don't warn unused-imports with used generated imports

Fixes #21730

* The old notion of "implicit" import has been renamed to "generated". See Note [Generated imports] in GHC.Hs.ImpExp.

* ImportMap now keeps track of generated and user-written imports separately. This avoids the fake SrcSpan we used to give the implicit Prelude import, and the hack that went with it.

* -ddump-minimal-imports now considers generated imports (but still only
  warns on + prints user-written imports)

* bestImport considers generated imports to take priority over user-written imports.

- - - - -
9fb3bad4 by Ben Gamari at 2025-08-20T11:48:31-04:00
mailmap: Use ben@well-typed.com more liberally

Nearly all of this work was done while working for Well-Typed.

- - - - -
774fec37 by Ben Gamari at 2025-08-20T11:49:15-04:00
Add primop to annotate the call stack with arbitrary data

We introduce a new primop `annotateStack#` which allows us to push
arbitrary data onto the call-stack.
This allows us to extract the data later when decoding the stack, for
example when an exception is thrown, showing more information to the
user without having to annotate the full call-stack with `HasCallStack`
constraints.

A new stack frame value is introduced `AnnFrame`, which consists of
nothing but a generic payload.

The primop has a small wrapper API that allows users to annotate their
call-stack in programs.
There is a pure API and an IO-based one. The former is a little bit
dubious, as it affects the evaluation of a program, so use with care.
The latter is "safe", as it doesn't change the evaluation of the
program.

The stack annotation mechanism is similarly implemented to the
`ExceptionAnnotation` and `Exception`, there is a typeclass to indicate
something can be pushed onto the call-stack and all values are wrapped
in the existential `SomeStackAnnotation`, which recover the type of the
annotation payload.

There is currently no builtin way to show the stack annotations when
`Backtraces` are displayed (i.e., when showing stack traces to the user),
which we will address in a follow-up MR.

-------------------------
Metric Increase:
    ghc_experimental_so
-------------------------

We increase the size of the package, so this is not unreasonable.

Co-Authored-By: fendor <fendor@posteo.de>
Co-Authored-By: Ben Gamari <bgamari.foss@gmail.com>

- - - - -
fdfa3892 by Ben Gamari at 2025-08-20T11:49:57-04:00
testsuite: Add regression test for #24606

- - - - -
39b2e382 by Cheng Shao at 2025-08-20T11:50:40-04:00
compiler: only use `Name` instead of `Id` in `SptEntry`

As a part of #26298, this patch refactors `SptEntry` to only carry a
`Name` instead of `Id`: we do not care about extra information like
caffyness or type at all in any static pointer related codegen logic.
This is necessary to make `SptEntry` serializable, as a part of the
grand plan of serializable bytecode.

Co-authored-by: Codex <codex@openai.com>

- - - - -
276f8ea8 by Vekhir -- at 2025-08-20T11:51:35-04:00
Bump Cabal dependency
- - - - -
0b9c7437 by Zubin Duggal at 2025-08-20T11:52:18-04:00
ci: Teach ci.sh to fetch FreeBSD artifacts from ghcup unofficial bindists and bootstrap compiler on FreeBSD to 9.10.1

Also refactor fetch_ghc logic in ci.sh, renaming the GHC_VERSION enviorment configuration variable to FETCH_GHC_VERSION,
making it clear that it is intended for use on platforms like Windows and FreeBSD where we don't want to use the GHC
excecutable from the platform environment and instead need to download and install GHC-$FETCH_GHC_VERSION from a release
bindist.

Fixes #26296

- - - - -
b2914797 by Cheng Shao at 2025-08-20T11:53:00-04:00
driver: use UniqSet for hiddenModules in DynFlags/FinderOpts

This patch replaces Set ModuleName with UniqSet ModuleName in
DynFlags.hiddenModules and FinderOpts.finder_hiddenModules for
improved efficiency.

Co-authored-by: Codex <codex@openai.com>

- - - - -
0335d899 by Cheng Shao at 2025-08-20T11:53:00-04:00
driver: use UniqMap ModuleName in the finder

This patch replaces Map ModuleName with UniqMap ModuleName in the
finder for improved efficiency.

Co-authored-by: Codex <codex@openai.com>

- - - - -
91f4faaa by Cheng Shao at 2025-08-20T11:53:43-04:00
configure: check python3 version and require minimal 3.7

Since !9515, the testsuite driver requires python3 version to be at
least 3.7, though this has never been checked by configure logic. This
patch implements the version check. Fixes #23234.

Co-authored-by: Codex <codex@openai.com>

- - - - -
df4ee9b4 by Cheng Shao at 2025-08-20T11:54:25-04:00
compiler: use zero cost coerce in GHC.CmmToAsm.CFG.loopInfo

This patch refactors GHC.CmmToAsm.CFG.loopInfo to use zero cost coerce
and thus addresses the TODO. For coerce to work, constructors of
Label/LabelMap/LabelSet from GHC.Cmm.Dataflow.Label are exposed,
though I believe it's a worthy tradeoff to avoid unnecessary runtime
cost without using unsafeCoerce, since the latter could be a landmine
for future refactoring.

Co-authored-by: Codex <codex@openai.com>

- - - - -
ccda188d by Simon Peyton Jones at 2025-08-20T11:55:07-04:00
Start with empty inerts in shortcut solving

When short-cut solving we were starting with an inert set that had
unsolved Wanteds.  This caused an infinite loop (#26314), because a
typechecker plugin kept being given that unsolved Wanted.

It's better just to start with an empty inert set

- - - - -
c8882ed7 by Ben Gamari at 2025-08-20T11:55:49-04:00
configure: Bump minimal bootstrap GHC version to 9.8
- - - - -
f0a19d74 by fendor at 2025-08-20T19:55:00-04:00
Remove deprecated functions from the ghci package

- - - - -
ebeb991b by fendor at 2025-08-20T19:55:00-04:00
base: Remove unstable heap representation details from GHC.Exts

- - - - -
e368e247 by Rodrigo Mesquita at 2025-08-20T19:55:42-04:00
bytecode: Use 32bits for breakpoint index

Fixes #26325

- - - - -
42724462 by Simon Hengel at 2025-08-21T17:52:11-04:00
Serialize wired-in names as external names when creating HIE files

Note that the domain of de-serialized names stays the same.
Specifically, for known-key names, before `lookupKnownKeyName` was used,
while now this is handled by `lookupOrigNameCache` which captures the
same range provided that the OrigNameCache has been initialized with
`knownKeyNames` (which is the case by default).

(fixes #26238)

- - - - -
6a43f8ec by Cheng Shao at 2025-08-21T17:52:52-04:00
compiler: fix closure C type in SPT init code

This patch fixes the closure C type in SPT init code to StgClosure,
instead of the previously incorrect StgPtr. Having an incorrect C type
makes SPT init code not compatible with other foreign stub generation
logic, which may also emit their own extern declarations for the same
closure symbols and thus will clash with the incorrect prototypes in
SPT init code.

- - - - -
5b5d9d47 by Ben Gamari at 2025-08-25T14:29:35-04:00
Revert "STM: don't create a transaction in the rhs of catchRetry# (#26028)"

This reverts commit 0a5836891ca29836a24c306d2a364c2e4b5377fd
- - - - -
10f06163 by Cheng Shao at 2025-08-25T14:30:16-04:00
wasm: ensure setKeepCAFs() is called in ghci

This patch is a critical bugfix for #26106, see comment and linked
issue for details.

- - - - -
bedc1004 by Cheng Shao at 2025-08-26T09:31:18-04:00
compiler: use zero cost coerce in hoopl setElems/mapToList

This patch is a follow-up of !14680 and changes setElems/mapToList in
GHC/Cmm/Dataflow/Label to use coerce instead of mapping mkHooplLabel
over the keys.

- - - - -
13250d97 by Ryan Scott at 2025-08-26T09:31:59-04:00
Reject infix promoted data constructors without DataKinds

In the rename, make sure to apply the same `DataKinds` checks for both
`HsTyVar` (for prefix promoted data constructors) and `HsOpTy` (for infix
promoted data constructors) alike.

Fixes #26318.

- - - - -
37655c46 by Teo Camarasu at 2025-08-26T15:24:51-04:00
tests: disable T22859 under LLVM

This test was failing under the LLVM backend since the allocations
differ from the NCG.

Resolves #26282

- - - - -
2cbba9d6 by Teo Camarasu at 2025-08-26T15:25:33-04:00
base-exports: update version numbers

As the version of the compiler has been bumped, a lot of the embedded
version numbers will need to be updated if we ever run this test with
`--test-accept` so let's just update them now, and keep future diffs
clean.

- - - - -
f9f2ffcf by Alexandre Esteves at 2025-08-27T07:19:14-04:00
Import new name for 'utimbuf' on windows to fix #26337

Fixes an `-Wincompatible-pointer-types` instance that turns into an error on
recent toolchains and surfaced as such on nixpkgs when doing linux->ucrt cross.

This long-standing warning has been present at least since 9.4:

C:\GitLabRunner\builds\0\1709189\tmp\ghc16652_0\ghc_4.c:26:115: error: warning: incompatible pointer types passing 'struct utimbuf *' to parameter of type 'struct _utimbuf *' [-Wincompatible-pointer-types] | 26 | HsInt32 ghczuwrapperZC9ZCbaseZCSystemziPosixziInternalsZCzuutime(char* a1, struct utimbuf* a2) {return _utime(a1, a2);} | ^ HsInt32 ghczuwrapperZC9ZCbaseZCSystemziPosixziInternalsZCzuutime(char* a1, struct utimbuf* a2) {return _utime(a1, a2);} ^~ C:\GitLabRunner\builds\0\1709189\_build\stage0\lib\..\..\mingw\x86_64-w64-mingw32\include\sys\utime.h:109:72: error: note: passing argument to parameter '_Utimbuf' here | 109 | __CRT_INLINE int __cdecl _utime(const char *_Filename,struct _utimbuf *_Utimbuf) { | ^ __CRT_INLINE int __cdecl _utime(const char *_Filename,struct _utimbuf *_Utimbuf) { ``` - - - - - ae89f000 by Hassan Al-Awwadi at 2025-08-27T07:19:56-04:00 Adds the fucnction addDependentDirectory to Q, resolving issue #26148. This function adds a new directory to the list of things a module depends upon. That means that when the contents of the directory change, the recompilation checker will notice this and the module will be recompiled. Documentation has also been added for addDependentFunction and addDependentDirectory in the user guide. - - - - - 00478944 by Simon Peyton Jones at 2025-08-27T16:48:30+01:00 Comments only - - - - - a7884589 by Simon Peyton Jones at 2025-08-28T11:08:23+01:00 Type-family occurs check in unification The occurs check in `GHC.Core.Unify.uVarOrFam` was inadequate in dealing with type families. Better now. See Note [The occurs check in the Core unifier]. As I did this I realised that the whole apartness thing is trickier than I thought: see the new Note [Shortcomings of the apartness test] - - - - - 8adfc222 by sheaf at 2025-08-28T19:47:17-04:00 Fix orientation in HsWrapper composition (<.>) This commit fixes the order in which WpCast HsWrappers are composed, fixing a bug introduced in commit 56b32c5a2d5d7cad89a12f4d74dc940e086069d1. Fixes #26350 - - - - - eb2ab1e2 by Oleg Grenrus at 2025-08-29T11:00:53-04:00 Generalise thNameToGhcName by adding HasHscEnv There were multiple single monad-specific `getHscEnv` across codebase. HasHscEnv is modelled on HasDynFlags. My first idea was to simply add thNameToGhcNameHsc and thNameToGhcNameTc, but those would been exactly the same as thNameToGhcName already. Also add an usage example to thNameToGhcName and mention that it's recommended way of looking up names in GHC plugins - - - - - 2d575a7f by fendor at 2025-08-29T11:01:36-04:00 configure: Bump minimal bootstrap GHC version to 9.10 - - - - - 716274a5 by Simon Peyton Jones at 2025-08-29T17:27:12-04:00 Fix deep subsumption again This commit fixed #26255: commit 56b32c5a2d5d7cad89a12f4d74dc940e086069d1 Author: sheaf Date: Mon Aug 11 15:50:47 2025 +0200 Improve deep subsumption This commit improves the DeepSubsumption sub-typing implementation in GHC.Tc.Utils.Unify.tc_sub_type_deep by being less eager to fall back to unification. But alas it still wasn't quite right for view patterns: #26331 This MR does a generalisation to fix it. A bit of a sledgehammer to crack a nut, but nice. * Add a field `ir_inst :: InferInstFlag` to `InferResult`, where ``` data InferInstFlag = IIF_Sigma | IIF_ShallowRho | IIF_DeepRho ``` * The flag says exactly how much `fillInferResult` should instantiate before filling the hole. * We can also use this to replace the previous very ad-hoc `tcInferSigma` that was used to implement GHCi's `:type` command. - - - - - 27206c5e by sheaf at 2025-08-29T17:28:14-04:00 Back-compat for TH SpecialiseP data-con of Pragma This commit improves the backwards-compatibility story for the SpecialiseP constructor of the Template Haskell 'Pragma' datatype. Instead of keeping the constructor but deprecating it, this commit makes it into a bundled pattern synonym of the Pragma datatype. We no longer deprecate it; it's useful for handling old-form specialise pragmas. - - - - - 26dbcf61 by fendor at 2025-08-30T05:10:08-04:00 Move stack decoding logic from ghc-heap to ghc-internal The stack decoding logic in `ghc-heap` is more sophisticated than the one currently employed in `CloneStack`. We want to use the stack decoding implementation from `ghc-heap` in `base`. We cannot simply depend on `ghc-heap` in `base` due do bootstrapping issues. Thus, we move the code that is necessary to implement stack decoding to `ghc-internal`. This is the right location, as we don't want to add a new API to `base`. Moving the stack decoding logic and re-exposing it in ghc-heap is insufficient, though, as we have a dependency cycle between. * ghc-heap depends on stage1:ghc-internal * stage0:ghc depends on stage0:ghc-heap To fix this, we remove ghc-heap from the set of `stage0` dependencies. This is not entirely straight-forward, as a couple of boot dependencies, such as `ghci` depend on `ghc-heap`. Luckily, the boot compiler of GHC is now >=9.10, so we can migrate `ghci` to use `ghc-internal` instead of `ghc-heap`, which already exports the relevant modules. However, we cannot 100% remove ghc's dependency on `ghc-heap`, since when we compile `stage0:ghc`, `stage1:ghc-internal` is not yet available. Thus, when we compile with the boot-compiler, we still depend on an older version of `ghc-heap`, and only use the modules from `ghc-internal`, if the `ghc-internal` version is recent enough. ------------------------- Metric Increase: T24602_perf_size T25046_perf_size_gzip T25046_perf_size_unicode T25046_perf_size_unicode_gzip size_hello_artifact size_hello_artifact_gzip size_hello_unicode size_hello_unicode_gzip ------------------------- These metric increases are unfortunate, they are most likely caused by the larger (literally in terms of lines of code) stack decoder implementation that are now linked into hello-word binaries. On linux, it is almost a 10% increase, which is considerable. - - - - - bd80bb70 by fendor at 2025-08-30T05:10:08-04:00 Implement `decode` in terms of `decodeStackWithIpe` Uses the more efficient stack decoder implementation. - - - - - 24441165 by fendor at 2025-08-30T05:10:08-04:00 Remove stg_decodeStackzh - - - - - fb9cc882 by Simon Peyton Jones at 2025-08-30T05:10:51-04:00 Fix a long standing bug in the coercion optimiser We were mis-optimising ForAllCo, leading to #26345 Part of the poblem was the tricky tower of abstractions leading to the dreadful GHC.Core.TyCo.Subst.substForAllCoTyVarBndrUsing This function was serving two masters: regular substitution, but also coercion optimsation. So tricky was it that it did so wrong. In this MR I locate all the fancy footwork for coercion optimisation in GHC.Core.Coercion.Opt, where it belongs. That leaves substitution free to be much simpler. - - - - - 6c78de2d by Sylvain Henry at 2025-09-01T08:46:19-04:00 Driver: substitute virtual Prim module in --make mode too When we build ghc-internal with --make (e.g. with cabal-install), we need to be careful to substitute the virtual interface file for GHC.Internal.Prim: - after code generation (we generate code for an empty module, so we get an empty interface) - when we try to reload its .hi file - - - - - 26e0db16 by fendor at 2025-09-01T08:47:01-04:00 Expose Stack Annotation frames in IPE backtraces by default When decoding the Haskell-native call stack and displaying the IPE information for the stack frames, we print the `StackAnnotation` of the `AnnFrame` by default. This means, when an exception is thrown, any intermediate stack annotations will be displayed in the `IPE Backtrace`. Example backtrace: ``` Exception: ghc-internal:GHC.Internal.Exception.ErrorCall: Oh no! IPE backtrace: annotateCallStackIO, called at app/Main.hs:48:10 in backtrace-0.1.0.0-inplace-server:Main annotateCallStackIO, called at app/Main.hs:46:13 in backtrace-0.1.0.0-inplace-server:Main Main.handler (app/Main.hs:(46,1)-(49,30)) Main.liftIO (src/Servant/Server/Internal/Handler.hs:30:36-42) Servant.Server.Internal.Delayed.runHandler' (src/Servant/Server/Internal/Handler.hs:27:31-41) Control.Monad.Trans.Resource.runResourceT (./Control/Monad/Trans/Resource.hs:(192,14)-(197,18)) Network.Wai.Handler.Warp.HTTP1.processRequest (./Network/Wai/Handler/Warp/HTTP1.hs:195:20-22) Network.Wai.Handler.Warp.HTTP1.processRequest (./Network/Wai/Handler/Warp/HTTP1.hs:(195,5)-(203,31)) Network.Wai.Handler.Warp.HTTP1.http1server.loop (./Network/Wai/Handler/Warp/HTTP1.hs:(141,9)-(157,42)) HasCallStack backtrace: error, called at app/Main.hs:48:32 in backtrace-0.1.0.0-inplace-server:Main ``` The first two entries have been added by `annotateCallStackIO`, defined in `annotateCallStackIO`. - - - - - a1567efd by Sylvain Henry at 2025-09-01T23:01:35-04:00 RTS: rely less on Hadrian for flag setting (#25843) Hadrian used to pass -Dfoo command-line flags directly to build the rts. We can replace most of these flags with CPP based on cabal flags. It makes building boot libraries with cabal-install simpler (cf #25843). - - - - - ca5b0283 by Sergey Vinokurov at 2025-09-01T23:02:23-04:00 Remove unnecessary irrefutable patterns from Bifunctor instances for tuples Implementation of https://github.com/haskell/core-libraries-committee/issues/339 Metric Decrease: mhu-perf - - - - - 2da84b7a by sheaf at 2025-09-01T23:03:23-04:00 Only use active rules when simplifying rule RHSs When we are simplifying the RHS of a rule, we make sure to only apply rewrites from rules that are active throughout the original rule's range of active phases. For example, if a rule is always active, we only fire rules that are themselves always active when simplifying the RHS. Ditto for inline activations. This is achieved by setting the simplifier phase to a range of phases, using the new SimplPhaseRange constructor. Then: 1. When simplifying the RHS of a rule, or of a stable unfolding, we set the simplifier phase to a range of phases, computed from the activation of the RULE/unfolding activation, using the function 'phaseFromActivation'. The details are explained in Note [What is active in the RHS of a RULE?] in GHC.Core.Opt.Simplify.Utils. 2. The activation check for other rules and inlinings is then: does the activation of the other rule/inlining cover the whole phase range set in sm_phase? This continues to use the 'isActive' function, which now accounts for phase ranges. On the way, this commit also moves the exact-print SourceText annotation from the Activation datatype to the ActivationAnn type. This keeps the main Activation datatype free of any extra cruft. Fixes #26323 - - - - - 79816cc4 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00 cleanup: Move dehydrateCgBreakInfo to Stg2Bc This no longer has anything to do with Core. - - - - - 53da94ff by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00 rts/Disassembler: Fix spacing of BRK_FUN - - - - - 08c0cf85 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00 debugger: Fix bciPtr in Step-out We need to use `BCO_NEXT` to move bciPtr to ix=1, because ix=0 points to the instruction itself! I do not understand how this didn't crash before. - - - - - e7e021fa by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00 debugger: Allow BRK_FUNs to head case continuation BCOs When we start executing a BCO, we may want to yield to the scheduler: this may be triggered by a heap/stack check, context switch, or a breakpoint. To yield, we need to put the stack in a state such that when execution is resumed we are back to where we yielded from. Previously, a BKR_FUN could only head a function BCO because we only knew how to construct a valid stack for yielding from one -- simply add `apply_interp_info` + the BCO to resume executing. This is valid because the stack at the start of run_BCO is headed by that BCO's arguments. However, in case continuation BCOs (as per Note [Case continuation BCOs]), we couldn't easily reconstruct a valid stack that could be resumed because we dropped too soon the stack frames regarding the value returned (stg_ret) and received (stg_ctoi) by that continuation. This is especially tricky because of the variable type and size return frames (e.g. pointer ret_p/ctoi_R1p vs a tuple ret_t/ctoi_t2). The trick to being able to yield from a BRK_FUN at the start of a case cont BCO is to stop removing the ret frame headers eagerly and instead keep them until the BCO starts executing. The new layout at the start of a case cont. BCO is described by the new Note [Stack layout when entering run_BCO]. Now, we keep the ret_* and ctoi_* frames when entering run_BCO. A BRK_FUN is then executed if found, and the stack is yielded as-is with the preserved ret and ctoi frames. Then, a case cont BCO's instructions always SLIDE off the headers of the ret and ctoi frames, in StgToByteCode.doCase, turning a stack like | .... | +---------------+ | fv2 | +---------------+ | fv1 | +---------------+ | BCO | +---------------+ | stg_ctoi_ret_ | +---------------+ | retval | +---------------+ | stg_ret_..... | +---------------+ into | .... | +---------------+ | fv2 | +---------------+ | fv1 | +---------------+ | retval | +---------------+ for the remainder of the BCO. Moreover, this more uniform approach of keeping the ret and ctoi frames means we need less ad-hoc logic concerning the variable size of ret_tuple vs ret_p/np frames in the code generator and interpreter: Always keep the return to cont. stack intact at the start of run_BCO, and the statically generated instructions will take care of adjusting it. Unlocks BRK_FUNs at the start of case cont. BCOs which will enable a better user-facing step-out (#26042) which is free of the bugs the current BRK_ALTS implementation suffers from (namely, using BRK_FUN rather than BRK_ALTS in a case cont. means we'll never accidentally end up in a breakpoint "deeper" than the continuation, because we stop at the case cont itself rather than on the first breakpoint we evaluate after it). - - - - - ade3c1e6 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00 BRK_FUN with InternalBreakLocs for code-generation time breakpoints At the start of a case continuation BCO, place a BRK_FUN. This BRK_FUN uses the new "internal breakpoint location" -- allowing us to come up with a valid source location for this breakpoint that is not associated with a source-level tick. For case continuation BCOs, we use the last tick seen before it as the source location. The reasoning is described in Note [Debugger: Stepout internal break locs]. Note how T26042c, which was broken because it displayed the incorrect behavior of the previous step out when we'd end up at a deeper level than the one from which we initiated step-out, is now fixed. As of this commit, BRK_ALTS is now dead code and is thus dropped. Note [Debugger: Stepout internal break locs] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Step-out tells the interpreter to run until the current function returns to where it was called from, and stop there. This is achieved by enabling the BRK_FUN found on the first RET_BCO frame on the stack (See [Note Debugger: Step-out]). Case continuation BCOs (which select an alternative branch) must therefore be headed by a BRK_FUN. An example: f x = case g x of <--- end up here 1 -> ... 2 -> ... g y = ... <--- step out from here - `g` will return a value to the case continuation BCO in `f` - The case continuation BCO will receive the value returned from g - Match on it and push the alternative continuation for that branch - And then enter that alternative. If we step-out of `g`, the first RET_BCO on the stack is the case continuation of `f` -- execution should stop at its start, before selecting an alternative. (One might ask, "why not enable the breakpoint in the alternative instead?", because the alternative continuation is only pushed to the stack *after* it is selected by the case cont. BCO) However, the case cont. BCO is not associated with any source-level tick, it is merely the glue code which selects alternatives which do have source level ticks. Therefore, we have to come up at code generation time with a breakpoint location ('InternalBreakLoc') to display to the user when it is stopped there. Our solution is to use the last tick seen just before reaching the case continuation. This is robust because a case continuation will thus always have a relevant breakpoint location: - The source location will be the last source-relevant expression executed before the continuation is pushed - So the source location will point to the thing you've just stepped out of - Doing :step-local from there will put you on the selected alternative (which at the source level may also be the e.g. next line in a do-block) Examples, using angle brackets (<<...>>) to denote the breakpoint span: f x = case <<g x>> {- step in here -} of 1 -> ... 2 -> ...> g y = <<...>> <--- step out from here ... f x = < ... 2 -> ...>> doing :step-local ... f x = case g x of 1 -> <<...>> <--- stop in the alternative 2 -> ... A second example based on T26042d2, where the source is a do-block IO action, optimised to a chain of `case expressions`. main = do putStrLn "hello1" <<f>> <--- step-in here putStrLn "hello3" putStrLn "hello4" f = do <> <--- step-out from here putStrLn "hello2.2" ... main = do putStrLn "hello1" <<f>> <--- end up here again, the previously executed expression putStrLn "hello3" putStrLn "hello4" doing step/step-local ... main = do putStrLn "hello1" f <> <--- straight to the next line putStrLn "hello4" Finishes #26042 - - - - - c66910c0 by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00 debugger: Re-use the last BreakpointId whole in step-out Previously, to come up with a location to stop at for `:stepout`, we would store the location of the last BreakpointId surrounding the continuation, as described by Note [Debugger: Stepout internal break locs]. However, re-using just the location from the last source breakpoint isn't sufficient to provide the necessary information in the break location. Specifically, it wouldn't bind any variables at that location. Really, there is no reason not to re-use the last breakpoint wholesale, and re-use all the information we had there. Step-out should behave just as if we had stopped at the call, but s.t. continuing will not re-execute the call. This commit updates the CgBreakInfo to always store a BreakpointId, be it the original one or the one we're emulating (for step-out). It makes variable bindings on :stepout work - - - - - e4abed7b by sheaf at 2025-09-02T12:20:40-04:00 Revert accidental changes to hie.yaml - - - - - 003b715b by meooow25 at 2025-09-02T23:48:51+02:00 Adjust the strictness of Data.List.iterate' * Don't force the next element in advance when generating a (:). * Force the first element to WHNF like every other element. Now every element in the output list is forced to WHNF when the (:) containing it is forced. CLC proposal: https://github.com/haskell/core-libraries-committee/issues/335 - - - - - b2f6aad0 by Simon Hengel at 2025-09-03T04:36:10-04:00 Refactoring: More consistently use logOutput, logInfo, fatalErrorMsg - - - - - 60a16db7 by Rodrigo Mesquita at 2025-09-03T10:55:50+01:00 bytecode: Don't PUSH_L 0; SLIDE 1 1 While looking through bytecode I noticed a quite common unfortunate pattern: ... PUSH_L 0 SLIDE 1 1 We do this often by generically constructing a tail call from a function atom that may be somewhere arbitrary on the stack. However, for the special case that the function can be found directly on top of the stack, as part of the arguments, it's plain redundant to push then slide it. In this commit we add a small optimisation to the generation of tailcalls in bytecode. Simply: lookahead for the function in the stack. If it is the first thing on the stack and it is part of the arguments which would be dropped as we entered the tail call, then don't push then slide it. In a simple example (T26042b), this already produced a drastic improvement in generated code (left is old, right is with this patch): ```diff 3c3 < 2025-07-29 10:14:02.081277 UTC ---

2025-07-29 10:50:36.560949 UTC 160,161c160 < PUSH_L 0 < SLIDE 1 2

SLIDE 1 1

164,165d162 < PUSH_L 0 < SLIDE 1 1 175,176c172 < PUSH_L 0 < SLIDE 1 2 ---

SLIDE 1 1

179,180d174 < PUSH_L 0 < SLIDE 1 1 206,207d199 < PUSH_L 0 < SLIDE 1 1 210,211d201 < PUSH_L 0 < SLIDE 1 1 214,215d203 < PUSH_L 0 < SLIDE 1 1 218,219d205 < PUSH_L 0 < SLIDE 1 1 222,223d207 < PUSH_L 0 < SLIDE 1 1 ... 600,601c566 < PUSH_L 0 < SLIDE 1 2 ---

SLIDE 1 1

604,605d568 < PUSH_L 0 < SLIDE 1 1 632,633d594 < PUSH_L 0 < SLIDE 1 1 636,637d596 < PUSH_L 0 < SLIDE 1 1 640,641d598 < PUSH_L 0 < SLIDE 1 1 644,645d600 < PUSH_L 0 < SLIDE 1 1 648,649d602 < PUSH_L 0 < SLIDE 1 1 652,653d604 < PUSH_L 0 < SLIDE 1 1 656,657d606 < PUSH_L 0 < SLIDE 1 1 660,661d608 < PUSH_L 0 < SLIDE 1 1 664,665d610 < PUSH_L 0 < SLIDE 1 1 ``` I also compiled lib:Cabal to bytecode and counted the number of bytecode lines with `find dist-newstyle -name "*.dump-BCOs" -exec wc {} +`: with unoptimized core: 1190689 lines (before) - 1172891 lines (now) = 17798 less redundant instructions (-1.5% lines) with optimized core: 1924818 lines (before) - 1864836 lines (now) = 59982 less redundant instructions (-3.1% lines) - - - - - 8b2c72c0 by L0neGamer at 2025-09-04T06:32:03-04:00 Add Control.Monad.thenM and Control.Applicative.thenA - - - - - 39e1b7cb by Teo Camarasu at 2025-09-04T06:32:46-04:00 ghc-internal: invert dependency of GHC.Internal.TH.Syntax on Data.Data This means that Data.Data no longer blocks building TH.Syntax, which allows greater parallelism in our builds. We move the Data.Data.Data instances to Data.Data. Quasi depends on Data.Data for one of its methods, so, we split the Quasi/Q, etc definition out of GHC.Internal.TH.Syntax into its own module. This has the added benefit of splitting up this quite large module. Previously TH.Syntax was a bottleneck when compiling ghc-internal. Now it is less of a bottle-neck and is also slightly quicker to compile (since it no longer contains these instances) at the cost of making Data.Data slightly more expensive to compile. TH.Lift which depends on TH.Syntax can also compile quicker and no longer blocks ghc-internal finishing to compile. Resolves #26217 ------------------------- Metric Decrease: MultiLayerModulesTH_OneShot T13253 T21839c T24471 Metric Increase: T12227 ------------------------- - - - - - bdf82fd2 by Teo Camarasu at 2025-09-04T06:32:46-04:00 compiler: delete unused names in Builtins.Names.TH returnQ and bindQ are no longer used in the compiler. There was also a very old comment that referred to them that I have modernized - - - - - 41a448e5 by Ben Gamari at 2025-09-04T19:21:43-04:00 hadrian: Pass lib & include directories to ghc `Setup configure` - - - - - 46bb9a79 by Ben Gamari at 2025-09-04T19:21:44-04:00 rts/IPE: Fix compilation when zstd is enabled This was broken by the refactoring undertaken in c80dd91c0bf6ac034f0c592f16c548b9408a8481. Closes #26312. - - - - - 138a6e34 by sheaf at 2025-09-04T19:22:46-04:00 Make mkCast assertion a bit clearer This commit changes the assertion message that gets printed when one calls mkCast with a coercion whose kind does not match the type of the inner expression. I always found the assertion message a bit confusing, as it didn't clearly state what exactly was the error. - - - - - 9d626be1 by sheaf at 2025-09-04T19:22:46-04:00 Simplifier/rules: fix mistakes in Notes & comments - - - - - 94b62aa7 by Simon Peyton Jones at 2025-09-08T03:37:14-04:00 Refactor ForAllCo This is a pure refactor, addressing #26389. It arranges that the kind coercion in a ForAllCo is a MCoercion, rather than a plain Coercion, thus removing redundancy in the common case. See (FC8) in Note [ForAllCo] It's a nice cleanup. - - - - - 624afa4a by sheaf at 2025-09-08T03:38:05-04:00 Use tcMkScaledFunTys in matchExpectedFunTys We should use tcMkScaledFunTys rather than mkScaledFunTys in GHC.Tc.Utils.Unify.matchExpectedFunTys, as the latter crashes when the kind of the result type is a bare metavariable. We know the result is always Type-like, so we don't need scaledFunTys to try to rediscover that from the kind. Fixes #26277 - - - - - 0975d2b6 by sheaf at 2025-09-08T03:38:54-04:00 Revert "Remove hptAllFamInstances usage during upsweep" This reverts commit 3bf6720eff5e86e673568e756161e6d6150eb440. - - - - - 0cf34176 by soulomoon at 2025-09-08T03:38:54-04:00 Family consistency checks: add test for #26154 This commit adds the test T26154, to make sure that GHC doesn't crash when performing type family consistency checks. This test case was extracted from Agda. Fixes #26154 - - - - - ba210d98 by Simon Peyton Jones at 2025-09-08T16:26:36+01:00 Report solid equality errors before custom errors This MR fixes #26255 by * Reporting solid equality errors like Int ~ Bool before "custom type errors". See comments in `report1` in `reportWanteds` * Suppressing errors that arise from superclasses of Wanteds. See (SCE1) in Note [Suppressing confusing errors] More details in #26255. - - - - - b6249140 by Simon Peyton Jones at 2025-09-10T10:42:38-04:00 Fix a scoping error in Specialise This small patch fixes #26329, which triggered a scoping error. Test is in T21391, with -fpolymorphic-specialisation enabled - - - - - 45305ab8 by sheaf at 2025-09-10T10:43:29-04:00 Make rationalTo{Float,Double} inline in phase 0 We hold off on inlining these until phase 0 to allow constant-folding rules to fire. However, once we get to phase 0, we should inline them, e.g. to expose unboxing opportunities. See CLC proposal #356. - - - - - 0959d4bc by Andreas Klebinger at 2025-09-10T10:44:12-04:00 Add regression test for #26056 - - - - - dc79593d by sheaf at 2025-09-10T10:45:01-04:00 Deep subsumption: unify mults without tcEqMult As seen in #26332, we may well end up with a non-reflexive multiplicity coercion when doing deep subsumption. We should do the same thing that we do without deep subsumption: unify the multiplicities normally, without requiring that the coercion is reflexive (which is what 'tcEqMult' was doing). Fixes #26332 - - - - - 4bfe2269 by sheaf at 2025-09-10T10:45:50-04:00 lint-codes: fixup MSYS drive letter on Windows This change ensures that System.Directory.listDirectory doesn't trip up on an MSYS-style path like '/c/Foo' when trying to list all testsuite stdout/stderr files as required for testing coverage of GHC diagnostic codes in the testsuite. Fixes #25178 - - - - - 56540775 by Ben Gamari at 2025-09-10T10:46:32-04:00 gitlab-ci: Disable split sections on FreeBSD Due to #26303. - - - - - 1537784b by Moritz Angermann at 2025-09-10T10:47:13-04:00 Improve mach-o relocation information This change adds more information about the symbol and addresses we try to relocate in the linker. This significantly helps when deubbging relocation issues reported by users. - - - - - 4e67855b by Moritz Angermann at 2025-09-10T10:47:54-04:00 test.mk expect GhcLeadingUnderscore, not LeadingUnderscore (in line with the other Ghc prefixed variables. - - - - - c1cdd265 by Moritz Angermann at 2025-09-10T10:48:35-04:00 testsuite: Fix broken exec_signals_child.c There is no signal 0. The signal mask is 1-32. - - - - - 99ac335c by Moritz Angermann at 2025-09-10T10:49:15-04:00 testsuite: clarify Windows/Darwin locale rationale for skipping T6037 T2507 T8959a - - - - - 0e8fa77a by Moritz Angermann at 2025-09-10T10:49:56-04:00 Skip broken tests on macOS (due to leading underscore not handled properly in the expected output.) - - - - - 28570c59 by Zubin Duggal at 2025-09-10T10:50:37-04:00 docs(sphinx): fix links to reverse flags when using the :ghc-flag:`-fno-<flag>` syntax This solution is rather hacky and I suspect there is a better way to do this but I don't know enough about Sphinx to do better. Fixes #26352 - - - - - d17257ed by Cheng Shao at 2025-09-10T17:01:27+02:00 rel-eng: update alpine images to 3.22 This patch is a part of #25876 and updates alpine images to 3.22, while still retaining 3.12 for x86_64 fully_static bindists. ------------------------- Metric Decrease: MultiComponentModulesRecomp ------------------------- - - - - - db3276bb by Sylvain Henry at 2025-09-11T11:27:28-04:00 T16180: indicate that the stack isn't executable - - - - - 11eeeba7 by Sylvain Henry at 2025-09-11T11:27:28-04:00 Fix some tests (statically linked GHC vs libc) When GHC is linked statically, the stdout C global variable that GHC uses isn't shared with the stdout C global variable used by loaded code. As a consequence, the latter must be explicitly flushed because GHC won't flush it before exiting. - - - - - 80a07571 by Sylvain Henry at 2025-09-11T11:28:18-04:00 Testsuite: fix debug_rts detection Running the testsuite without Hadrian should set config.debug_rts correctly too. - - - - - 62ae97de by Duncan Coutts at 2025-09-12T13:23:33-04:00 Handle heap allocation failure in I/O primops The current I/O managers do not use allocateMightFail, but future ones will. To support this properly we need to be able to return to the primop with a failure. We simply use a bool return value. Currently however, we will just throw an exception rather than calling the GC because that's what all the other primops do too. For the general issue of primops invoking GC and retrying, see https://gitlab.haskell.org/ghc/ghc/-/issues/24105 - - - - - cb9093f5 by Duncan Coutts at 2025-09-12T13:23:33-04:00 Move (and rename) scheduleStartSignalHandlers into RtsSignals.h Previously it was a local helper (static) function in Schedule.c. Rename it to startPendingSignalHandlers and deifine it as an inline header function in RtsSignals.h. So it should still be fast. Each (new style) I/O manager is going to need to do the same, so eliminating the duplication now makes sense. - - - - - 9736d44a by Duncan Coutts at 2025-09-12T13:23:33-04:00 Reduce detail in printThreadBlockage I/O blocking cases The printThreadBlockage is used in debug tracing output. For the cases BlockedOn{Read,Write,Delay} the output previously included the fd that was being waited on, and the delay target wake time. Superficially this sounds useful, but it's clearly not that useful because it was already wrong for the Win32 non-threaded I/O manager. In that situation it will print garbage (the async_result pointer, cast to a fd or a time). So given that it apparently never mattered that the information was accurate, then it's hardly a big jump to say it doesn't matter if it is present at all. A good reason to remove it is that otherwise we have to make a new API and a per-I/O manager implementation to fetch the information. And for some I/O manager implementations, this information is not available. It is not available in the win32 non-threaded I/O manager. And for some future Linux ones, there is no need for the fd to be stored, so storing it would be just extra space used for very little gain. So the simplest thing is to just remove the detail. - - - - - bc0f2d5d by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add TimeoutQueue.{c,h} and corresponding tests A data structure used to efficiently manage a collection of timeouts. It is a priority queue based on absolute expiry time. It uses 64bit high-precision Time for the keys. The values are normal closures which allows for example using MVars for unblocking. It is common in many applications for timeouts to be created and then deleted or altered before they expire. Thus the choice of data structure for timeouts should support this efficiently. The implementation choice here is a leftist heap with the extra feature that it supports deleting arbitrary elements, provided the caller retain a pointer to the element. While the deleteMin operation takes O(log n) time, as in all heap structures, the delete operation for arbitrary elements /typically/ takes O(1), and only O(log n) in the worst case. In practice, when managing thousands of timeouts it can be a factor of 10 faster to delete a random timeout queue element than to remove the minimum element. This supports the common use case. The plan is to use it in some of the RTS-side I/O managers to support their timer functionality. In this use case the heap value will be an MVar used for each timeout to unblock waiting threads. - - - - - d1679c9d by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add ClosureTable.{c,h} and corresponding tests A table of pointers to closures on the GC heap with stable indexes. It provides O(1) alloc, free and lookup. The table can be expanded using a simple doubling strategy: in which case allocation is typically O(1) and occasionally O(n) for overall amortised O(1). No shrinking is used. The table itself is heap allocated, and points to other heap objects. As such it's necessary to use markClosureTable to ensure the table is used as a GC root to keep the table entries alive, and maintain proper pointers to them as the GC moves heap objects about. It is designed to be allocated and accesses exclusively from a single capability, enabling it to work without any locking. It is thus similar to the StablePtr table, but per-capability which removes the need for locking. It _should_ also provide lower GC pause times with the non-moving GC by spending only O(1) time in markClosureTable, vs O(n) for markStablePtrTable. The plan is to use it in some of the I/O managers to keep track of in-flight I/O operations (but not timers). This allows the tracking info to be kept on the (unpinned) GC heap, and shared with Haskell code, and by putting a pointer to the tracking information in a table, the index remains stable and can be passed via foreign code (like the kernel). - - - - - 78cb8dd5 by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add the StgAsyncIOOp closure type This is intended to be used by multiple I/O managers to help with tracking in-flight I/O operations. It is called asynchronous because from the point of view of the RTS we have many such operations in progress at once. From the point of view of a Haskell thread of course it can look synchronous. - - - - - a2839896 by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add StgAsyncIOOp and StgTimeoutQueue to tso->block_info These will be used by new I/O managers, for threads blocked on I/O or timeouts. - - - - - fdc2451c by Duncan Coutts at 2025-09-12T13:23:33-04:00 Add a new I/O manager based on poll() This is a proof of concept I/O manager, to show how to add new ones neatly, using the ClosureTable and TimeoutQueue infrastructure. It uses the old unix poll() API, so it is of course limited in performance by that, but it should have the benefit of wide compatibility. Also we neatly avoid a name clash with the existing select() I/O manager. Compared to the select() I/O manager: 1. beause it uses poll() it is not limited to 1024 file descriptors (but it's still O(n) so don't expect great performance); 2. it should have much faster threadDelay (when using it in lots of threads at once) because it's based on the new TimeoutQueue which is O(log n) rather than O(n). Some of the code related to timers/timouts is put into a shared module rts/posix/Timeout.{h,c} since it is intended to be shared with other similar I/O managers. - - - - - 6c273b76 by Duncan Coutts at 2025-09-12T13:23:34-04:00 Document the I/O managers in the user guide and note the new poll I/O manager in the release notes. - - - - - 824fab74 by Duncan Coutts at 2025-09-12T13:23:34-04:00 Use the poll() I/O manager by default That is, for the non-threaded RTS, prefer the poll I/O manager over the legacy select() one, if both can be enabled. This patch is primarily for CI testing, so we should probably remove this patch before merging. We can change defaults later after wider testing and feedback. - - - - - 39392532 by Luite Stegeman at 2025-09-12T13:24:16-04:00 Support larger unboxed sums Change known constructor encoding for sums in interfaces to use 11 bits for both the arity and the alternative (up from 8 and 6, respectively) - - - - - 2af12e21 by Luite Stegeman at 2025-09-12T13:24:16-04:00 Decompose padding smallest-first in Cmm toplevel data constructors This makes each individual padding value aligned - - - - - 418fa78f by Luite Stegeman at 2025-09-12T13:24:16-04:00 Use slots smaller than word as tag for smaller unboxed sums This packs unboxed sums more efficiently by allowing Word8, Word16 and Word32 for the tag field if the number of constructors is small enough - - - - - 8d7e912f by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00 ghc-toolchain: Use ByteOrder rather than new Endianness Don't introduce a duplicate datatype when the previous one is equivalent and already used elsewhere. This avoids unnecessary translation between the two. - - - - - 7d378476 by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00 Read Toolchain.Target files rather than 'settings' This commit makes GHC read `lib/targets/default.target`, a file with a serialized value of `ghc-toolchain`'s `GHC.Toolchain.Target`. Moreover, it removes all the now-redundant entries from `lib/settings` that are configured as part of a `Target` but were being written into `settings`. This makes it easier to support multiple targets from the same compiler (aka runtime retargetability). `ghc-toolchain` can be re-run many times standalone to produce a `Target` description for different targets, and, in the future, GHC will be able to pick at runtime amongst different `Target` files. This commit only makes it read the default `Target` configured in-tree or configured when installing the bindist. The remaining bits of `settings` need to be moved to `Target` in follow up commits, but ultimately they all should be moved since they are per-target relevant. Fixes #24212 On Windows, the constant overhead of parsing a slightly more complex data structure causes some small-allocation tests to wiggle around 1 to 2 extra MB (1-2% in these cases). ------------------------- Metric Increase: MultiLayerModulesTH_OneShot T10421 T10547 T12234 T12425 T13035 T18140 T18923 T9198 TcPlugin_RewritePerf ------------------------- - - - - - e0780a16 by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00 ghc-toolchain: Move TgtHasLibm to per-Target file TargetHasLibm is now part of the per-target configuration Towards #26227 - - - - - 8235dd8c by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00 ghc-toolchain: Move UseLibdw to per-Target file To support DWARF unwinding, the RTS must be built with the -f+libdw flag and with the -DUSE_LIBDW macro definition. These flags are passed on build by Hadrian when --enable-dwarf-unwinding is specified at configure time. Whether the RTS was built with support for DWARF is a per-target property, and as such, it was moved to the per-target GHC.Toolchain.Target.Target file. Additionally, we keep in the target file the include and library paths for finding libdw, since libdw should be checked at configure time (be it by configure, or ghc-toolchain, that libdw is properly available). Preserving the user-given include paths for libdw facilitates in the future building the RTS on demand for a given target (if we didn't keep that user input, we couldn't) Towards #26227 - - - - - d5ecf2e8 by Rodrigo Mesquita at 2025-09-12T17:57:25-04:00 ghc-toolchain: Make "Support SMP" a query on a Toolchain.Target "Support SMP" is merely a function of target, so we can represent it as such in `ghc-toolchain`. Hadrian queries the Target using this predicate to determine how to build GHC, and GHC queries the Target similarly to report under --info whether it "Support SMP" Towards #26227 - - - - - e07b031a by Rodrigo Mesquita at 2025-09-12T17:57:25-04:00 ghc-toolchain: Make "tgt rts linker only supports shared libs" function on Target Just like with "Support SMP", "target RTS linker only supports shared libraries" is a predicate on a `Target` so we can just compute it when necessary from the given `Target`. Towards #26227 - - - - - 14123ee6 by Simon Peyton Jones at 2025-09-12T17:58:07-04:00 Solve forall-constraints via an implication, again In this earlier commit: commit 953fd8f1dc080f1c56e3a60b4b7157456949be29 Author: Simon Peyton Jones Date: Mon Jul 21 10:06:43 2025 +0100 Solve forall-constraints immediately, or not at all I used a all-or-nothing strategy for quantified constraints (aka forall-constraints). But alas that fell foul of #26315, and #26376. So this MR goes back to solving a quantified constraint by turning it into an implication; UNLESS we are simplifying constraints from a SPECIALISE pragma, in which case the all-or-nothing strategy is great. See: Note [Solving a Wanted forall-constraint] Other stuff in this MR: * TcSMode becomes a record of flags, rather than an enumeration type; much nicer. * Some fancy footwork to avoid error messages worsening again (The above MR made them better; we want to retain that.) See `GHC.Tc.Errors.Ppr.pprQCOriginExtra`. ------------------------- Metric Decrease: T24471 ------------------------- - - - - - e6c192e2 by Simon Peyton Jones at 2025-09-12T17:58:07-04:00 Add a test case for #26396 ...same bug ast #26315 - - - - - 8f3d80ff by Luite Stegeman at 2025-09-13T08:43:09+02:00 Use mkVirtHeapOffsets for reconstructing terms in RTTI This makes mkVirtHeapOffsets the single source of truth for finding field offsets in closures. - - - - - eb389338 by Luite Stegeman at 2025-09-13T08:43:09+02:00 Sort non-pointer fields by size for more efficient packing This sorts non-pointer fields in mkVirtHeapOffsets, always storing the largest field first. The relative order of equally sized fields remains unchanged. This reduces wasted padding/alignment space in closures with differently sized fields. - - - - - 99b233f4 by Alison at 2025-09-13T16:51:04-04:00 ghc-heap: Fix race condition with profiling builds Apply the same fix from Closures.hs (64fd0fac83) to Heap.hs by adding empty imports to make way-dependent dependencies visible to `ghc -M`. Fixes #15197, #26407 - - - - - 77deaa7a by Cheng Shao at 2025-09-14T21:29:45-04:00 hadrian: build in-tree gmp with -fvisibility=hidden When hadrian builds in-tree gmp, it should build the shared objects with -fvisibility=hidden. The gmp symbols are only used by bignum logic in ghc-internal and shouldn't be exported by the ghc-internal shared library. We should always strive to keep shared library symbol table lean, which benefits platforms with slow dynamic linker or even hard limits about how many symbols can be exported (e.g. macos dyld, win32 dll and wasm dyld). - - - - - 42a18960 by Cheng Shao at 2025-09-14T21:30:26-04:00 Revert "wasm: add brotli compression for ghci browser mode" This reverts commit 731217ce68a1093b5f9e26a07d5bd2cdade2b352. Benchmarks show non-negligible overhead when browser runs on the same host, which is the majority of actual use cases. - - - - - e6755b9f by Cheng Shao at 2025-09-14T21:30:26-04:00 wasm: remove etag logic in ghci browser mode web server This commit removes the etag logic in dyld script's ghci browser mode web server. It was meant to support caching logic of wasm shared libraries, but even if the port is manually specified to make caching even relevant, for localhost the extra overhead around etag logic is simply not worth it according to benchmarks. - - - - - 7319062d by Alan Zimmerman at 2025-09-15T20:35:40+01:00 GHC-CPP: first rough proof of concept Processes #define FOO #ifdef FOO x = 1 #endif Into [ITcppIgnored [L loc ITcppDefine] ,ITcppIgnored [L loc ITcppIfdef] ,ITvarid "x" ,ITequal ,ITinteger (IL {il_text = SourceText "1", il_neg = False, il_value = 1}) ,ITcppIgnored [L loc ITcppEndif] ,ITeof] In time, ITcppIgnored will be pushed into a comment - - - - - 903de13b by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Tidy up before re-visiting the continuation mechanic - - - - - 2d5d69d3 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Switch preprocessor to continuation passing style Proof of concept, needs tidying up - - - - - 7f7c5b88 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Small cleanup - - - - - 868e09df by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Get rid of some cruft - - - - - b3c0eea6 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Starting to integrate. Need to get the pragma recognised and set - - - - - 81cb14f6 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Make cppTokens extend to end of line, and process CPP comments - - - - - 55be8e83 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Remove unused ITcppDefined - - - - - 2f4b3089 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Allow spaces between # and keyword for preprocessor directive - - - - - f51a8729 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Process CPP continuation lines They are emited as separate ITcppContinue tokens. Perhaps the processing should be more like a comment, and keep on going to the end. BUT, the last line needs to be slurped as a whole. - - - - - 2ccd0925 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Accumulate CPP continuations, process when ready Can be simplified further, we only need one CPP token - - - - - e51834a1 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Simplify Lexer interface. Only ITcpp We transfer directive lines through it, then parse them from scratch in the preprocessor. - - - - - ec566b2a by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Deal with directive on last line, with no trailing \n - - - - - dc3cc67f by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Start parsing and processing the directives - - - - - ece707ed by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Prepare for processing include files - - - - - 0a0a7a9c by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Move PpState into PreProcess And initParserState, initPragState too - - - - - 239b2ccf by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Process nested include files Also move PpState out of Lexer.x, so it is easy to evolve it in a ghci session, loading utils/check-cpp/Main.hs - - - - - 7fb8d423 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Split into separate files - - - - - 54f12815 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Starting on expression parser. But it hangs. Time for Text.Parsec.Expr - - - - - 91dfe7a0 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Start integrating the ghc-cpp work From https://github.com/alanz/ghc-cpp - - - - - 59b32666 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 WIP - - - - - 3e128eef by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Fixup after rebase - - - - - 9aace33f by Alan Zimmerman at 2025-09-15T20:35:40+01:00 WIP - - - - - c648e35a by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Fixup after rebase, including all tests pass - - - - - 47f6d5aa by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Change pragma usage to GHC_CPP from GhcCPP - - - - - f4a0b365 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Some comments - - - - - e8e14570 by Alan Zimmerman at 2025-09-15T20:35:40+01:00 Reformat - - - - - 9e12fcd6 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Delete unused file - - - - - 36e87da9 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Rename module Parse to ParsePP - - - - - c703996c by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Clarify naming in the parser - - - - - ca22e867 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 WIP. Switching to alex/happy to be able to work in-tree Since Parsec is not available - - - - - fd02e5e0 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Layering is now correct - GHC lexer, emits CPP tokens - accumulated in Preprocessor state - Lexed by CPP lexer, CPP command extracted, tokens concated with spaces (to get rid of token pasting via comments) - if directive lexed and parsed by CPP lexer/parser, and evaluated - - - - - 7ff1c836 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 First example working Loading Example1.hs into ghci, getting the right results ``` {-# LANGUAGE GHC_CPP #-} module Example1 where y = 3 x = "hello" "bye now" foo = putStrLn x ``` - - - - - 5482b3d0 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Rebase, and all tests pass except whitespace for generated parser - - - - - 5778d132 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 More plumbing. Ready for testing tomorrow. - - - - - 6d2738d8 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Proress. Renamed module State from Types And at first blush it seems to handle preprocessor scopes properly. - - - - - e1545cc2 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Insert basic GHC version macros into parser __GLASGOW_HASKELL__ __GLASGOW_HASKELL_FULL_VERSION__ __GLASGOW_HASKELL_PATCHLEVEL1__ __GLASGOW_HASKELL_PATCHLEVEL2__ - - - - - d85ab913 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Re-sync check-cpp for easy ghci work - - - - - 4a6cfa60 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Get rid of warnings - - - - - a3b93a22 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Rework macro processing, in check-cpp Macros kept at the top level, looked up via name, multiple arity versions per name can be stored - - - - - 87b06fb5 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 WIP. Can crack arguments for #define Next step it to crack out args in an expansion - - - - - 9e324303 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 WIP on arg parsing. - - - - - 37299716 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Progress. Still screwing up nested parens. - - - - - 82418ba4 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Seems to work, but has redundant code - - - - - 06dd529b by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Remove redundant code - - - - - 2a55cc12 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Reformat - - - - - a5cc461d by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Expand args, single pass Still need to repeat until fixpoint - - - - - 383c6b35 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Fixed point expansion - - - - - 64090293 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Sync the playground to compiler - - - - - 6efe9ec4 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Working on dumping the GHC_CPP result But We need to keep the BufSpan in a comment - - - - - c84b3092 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Keep BufSpan in queued comments in GHC.Parser.Lexer - - - - - e08b8974 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Getting close to being able to print the combined tokens showing what is in and what is out - - - - - 81080d80 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 First implementation of dumpGhcCpp. Example output First dumps all macros in the state, then the source, showing which lines are in and which are out ------------------------------ - |#define FOO(A,B) A + B - |#define FOO(A,B,C) A + B + C - |#if FOO(1,FOO(3,4)) == 8 - |-- a comment |x = 1 - |#else - |x = 5 - |#endif - - - - - 5798dfc3 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Clean up a bit - - - - - 11f7f31b by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Add -ddump-ghc-cpp option and a test based on it - - - - - 9f5db97d by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Restore Lexer.x rules, we need them for continuation lines - - - - - b2a3d445 by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Lexer.x: trying to sort out the span for continuations - We need to match on \n at the end of the line - We cannot simply back up for it - - - - - 4dae22ec by Alan Zimmerman at 2025-09-15T20:35:41+01:00 Inserts predefined macros. But does not dump properly Because the cpp tokens have a trailing newline - - - - - 30588882 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Remove unnecessary LExer rules We *need* the ones that explicitly match to the end of the line. - - - - - f720fb6a by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Generate correct span for ITcpp Dump now works, except we do not render trailing `\` for continuation lines. This is good enough for use in test output. - - - - - ea7c081f by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Reduce duplication in lexer - - - - - 08798c48 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Tweaks - - - - - f4ebe401 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Insert min_version predefined macros into state The mechanism now works. Still need to flesh out the full set. - - - - - 244495bc by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Trying my alternative pragma syntax. It works, but dumpGhcCpp is broken, I suspect from the ITcpp token span update. - - - - - 3a76b507 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Pragma extraction now works, with both CPP and GHC_CPP For the following {-# LANGUAGE CPP #-} #if __GLASGOW_HASKELL__ >= 913 {-# LANGUAGE GHC_CPP #-} #endif We will enable GHC_CPP only - - - - - 3ac4aa48 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Remove some tracing - - - - - 580497e7 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Fix test exes for changes - - - - - 792b0425 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 For GHC_CPP tests, normalise config-time-based macros - - - - - e81adf24 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 WIP - - - - - 5b8e3318 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 WIP again. What is wrong? - - - - - de70042e by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Revert to dynflags for normal not pragma lexing - - - - - e7dfc9ab by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Working on getting check-exact to work properly - - - - - 40dcb97e by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Passes CppCommentPlacement test - - - - - 774438a3 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Starting on exact printing with GHC_CPP While overriding normal CPP - - - - - 3f1da699 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Correctly store CPP ignored tokens as comments By populating the lexeme string in it, based on the bufpos - - - - - cd72f67f by Alan Zimmerman at 2025-09-15T20:35:42+01:00 WIP - - - - - 262db39b by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Simplifying - - - - - 5a667c1e by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Update the active state logic - - - - - 1f63d974 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Work the new logic into the mainline code - - - - - d65cfbba by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Process `defined` operator - - - - - 8090c4de by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Manage lexer state while skipping tokens There is very intricate layout-related state used when lexing. If a CPP directive blanks out some tokens, store this state when the blanking starts, and restore it when they are no longer being blanked. - - - - - e2db1693 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Track the last token buffer index, for ITCppIgnored We need to attach the source being skipped in an ITCppIgnored token. We cannot simply use its BufSpan as an index into the underlying StringBuffer as it counts unicode chars, not bytes. So we update the lexer state to store the starting StringBuffer location for the last token, and use the already-stored length to extract the correct portion of the StringBuffer being parsed. - - - - - 95e1fc23 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Process the ! operator in GHC_CPP expressions - - - - - 3909028a by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Predefine a constant when GHC_CPP is being used. - - - - - b1e89d84 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 WIP - - - - - 1d06941f by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Skip lines directly in the lexer when required - - - - - 3cbbeff8 by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Properly manage location when accepting tokens again - - - - - 47811bbc by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Seems to be working now, for Example9 - - - - - ffc52c2b by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Remove tracing - - - - - 6e2163ad by Alan Zimmerman at 2025-09-15T20:35:42+01:00 Fix parsing '*' in block comments Instead of replacing them with '-' - - - - - 6becef0e by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Keep the trailing backslash in a ITcpp token - - - - - 3e8b9364 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Deal with only enabling one section of a group. A group is an instance of a conditional introduced by #if/#ifdef/#ifndef, and ending at the final #endif, including intermediate #elsif sections - - - - - 5ed953b3 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Replace remaining identifiers with 0 when evaluating As per the spec - - - - - 893278e1 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Snapshot before rebase - - - - - fc2313ee by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Skip non-processed lines starting with # - - - - - d796201b by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Export generateMacros so we can use it in ghc-exactprint - - - - - 76db2b93 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Fix rebase - - - - - 86b49c5d by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Expose initParserStateWithMacrosString - - - - - 36878b7e by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Fix buggy lexer cppSkip It was skipping all lines, not just ones prefixed by # - - - - - 153500c0 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Fix evaluation of && to use the correct operator - - - - - 2c7ecc76 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Deal with closing #-} at the start of a line - - - - - e4dd7ce5 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Add the MIN_VERSION_GLASGOW_HASKELL predefined macro - - - - - 63a0039c by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Include MIN_VERSION_GLASGOW_HASKELL in GhcCpp01.stderr - - - - - a756e486 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Use a strict map for macro defines - - - - - 87eed49c by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Process TIdentifierLParen Which only matters at the start of #define - - - - - cb407925 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Do not provide TIdentifierLParen paren twice - - - - - db0b74c8 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Handle whitespace between identifier and '(' for directive only - - - - - 948befcc by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Expose some Lexer bitmap manipulation helpers - - - - - 2c4bcec8 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Deal with line pragmas as tokens Blows up for dumpGhcCpp though - - - - - f6484182 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Allow strings delimited by a single quote too - - - - - 6553c2e7 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Allow leading whitespace on cpp directives As per https://timsong-cpp.github.io/cppwp/n4140/cpp#1 - - - - - 699c9686 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Implement GHC_CPP undef - - - - - 9ea2901d by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Sort out expansion of no-arg macros, in a context with args And make the expansion bottom out, in the case of recursion - - - - - 19301e80 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Fix GhcCpp01 test The LINE pragma stuff works in ghc-exactprint when specifically setting flag to emit ITline_pragma tokens - - - - - a4eb0426 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Process comments in CPP directives - - - - - 14a5a65f by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Correctly lex pragmas with finel #-} on a newline - - - - - 9570d89a by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Do not process CPP-style comments - - - - - c23d8d22 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Allow cpp-style comments when GHC_CPP enabled - - - - - febee668 by Alan Zimmerman at 2025-09-15T20:35:43+01:00 Return other pragmas as cpp ignored when GHC_CPP active - - - - - 56ac6d44 by Alan Zimmerman at 2025-09-15T20:36:47+01:00 Reorganise getOptionsFromFile for use in ghc-exactprint We want to be able to inject predefined macro definitions into the parser preprocessor state for when we do a hackage roundtrip. - - - - - 6188d731 by Alan Zimmerman at 2025-09-15T20:36:47+01:00 Tweak testing - - - - - 60f60913 by Alan Zimmerman at 2025-09-15T20:36:47+01:00 Only allow unknown cpp pragmas with # in left margin - - - - - 22be4a3d by Alan Zimmerman at 2025-09-15T20:36:47+01:00 Require # against left margin for all GHC_CPP directives - - - - - 0c55a011 by Alan Zimmerman at 2025-09-15T20:36:47+01:00 Fix CPP directives appearing in pragmas And add a test for error reporting for missing `#if` - - - - - 85383e46 by Alan Zimmerman at 2025-09-15T20:36:47+01:00 Starting to report GHC_CPP errors using GHC machinery - - - - - 7b361ca3 by Alan Zimmerman at 2025-09-15T20:36:47+01:00 More GHC_CPP diagnostic results - - - - - 17995c27 by Alan Zimmerman at 2025-09-15T20:36:47+01:00 WIP on converting error calls to GHC diagnostics in GHC_CPP - - - - - b773aae7 by Alan Zimmerman at 2025-09-15T20:36:47+01:00 Working on CPP diagnostic reporting - - - - - 04eaef73 by Alan Zimmerman at 2025-09-15T20:36:47+01:00 Tweak some tests/lint warnings - - - - - 8a74410c by Alan Zimmerman at 2025-09-15T20:36:47+01:00 More error reporting in Macro - - - - - c9b2060e by Alan Zimmerman at 2025-09-15T20:36:47+01:00 Some cleanups - - - - - bc744ba8 by Alan Zimmerman at 2025-09-15T20:36:48+01:00 Some cleanup - - - - - edfe8ea0 by Alan Zimmerman at 2025-09-15T20:36:48+01:00 GHC_CPP: Working on improving error reporting - - - - - 835f61e1 by Alan Zimmerman at 2025-09-15T20:36:48+01:00 Harvest some commonality - - - - - 3b4b7adc by Alan Zimmerman at 2025-09-15T20:36:48+01:00 Use PPM as Maybe inside PP - - - - - ab800f75 by Alan Zimmerman at 2025-09-15T20:36:48+01:00 Clean up a bit - - - - - 462b0c52 by Alan Zimmerman at 2025-09-16T18:22:13+01:00 Fix GhcCpp01 test I think this needs to be made more robust. Likely by not dumping the (pre-)defined macros. - - - - - 1038 changed files: - .gitlab-ci.yml - .gitlab/ci.sh - .gitlab/darwin/toolchain.nix - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py - .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py - .mailmap - CODEOWNERS - README.md - compiler/GHC.hs - compiler/GHC/Builtin/Names.hs - compiler/GHC/Builtin/Names/TH.hs - compiler/GHC/Builtin/PrimOps/Ids.hs - compiler/GHC/Builtin/Types.hs - compiler/GHC/Builtin/Types/Prim.hs - compiler/GHC/Builtin/Uniques.hs - compiler/GHC/Builtin/primops.txt.pp - compiler/GHC/ByteCode/Asm.hs - + compiler/GHC/ByteCode/Breakpoints.hs - compiler/GHC/ByteCode/InfoTable.hs - compiler/GHC/ByteCode/Instr.hs - compiler/GHC/ByteCode/Linker.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Cmm.hs - compiler/GHC/Cmm/CommonBlockElim.hs - compiler/GHC/Cmm/Dataflow/Label.hs - compiler/GHC/Cmm/Lexer.x - compiler/GHC/Cmm/Parser.y - compiler/GHC/Cmm/Parser/Monad.hs - compiler/GHC/Cmm/Utils.hs - compiler/GHC/CmmToAsm/CFG.hs - compiler/GHC/CmmToAsm/LA64/CodeGen.hs - compiler/GHC/CmmToAsm/LA64/Instr.hs - compiler/GHC/CmmToAsm/LA64/Ppr.hs - compiler/GHC/CmmToAsm/PPC/Ppr.hs - compiler/GHC/CmmToAsm/Ppr.hs - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToAsm/X86/Instr.hs - compiler/GHC/CmmToAsm/X86/Ppr.hs - compiler/GHC/CmmToLlvm/CodeGen.hs - compiler/GHC/CmmToLlvm/Data.hs - compiler/GHC/Core.hs - compiler/GHC/Core/Class.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/Coercion.hs-boot - compiler/GHC/Core/Coercion/Opt.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/FVs.hs - compiler/GHC/Core/FamInstEnv.hs - compiler/GHC/Core/LateCC/OverloadedCalls.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Map/Expr.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/CprAnal.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/Monad.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/Pipeline/Types.hs - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Core/Opt/Simplify.hs - compiler/GHC/Core/Opt/Simplify/Env.hs - compiler/GHC/Core/Opt/Simplify/Inline.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/Opt/WorkWrap.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/Ppr.hs - compiler/GHC/Core/Predicate.hs - compiler/GHC/Core/Reduction.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/Subst.hs - compiler/GHC/Core/Tidy.hs - compiler/GHC/Core/TyCo/Compare.hs - compiler/GHC/Core/TyCo/FVs.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCo/Subst.hs - compiler/GHC/Core/TyCo/Tidy.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Unfold.hs - compiler/GHC/Core/Unfold/Make.hs - compiler/GHC/Core/Unify.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/CoreToIface.hs - compiler/GHC/CoreToStg.hs - + compiler/GHC/CoreToStg/AddImplicitBinds.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Data/IOEnv.hs - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/CmdLine.hs - compiler/GHC/Driver/CodeOutput.hs - compiler/GHC/Driver/Config.hs - compiler/GHC/Driver/Config/Core/Lint.hs - compiler/GHC/Driver/Config/Core/Opt/Simplify.hs - compiler/GHC/Driver/Config/Finder.hs - compiler/GHC/Driver/Config/Parser.hs - compiler/GHC/Driver/Downsweep.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Env.hs - compiler/GHC/Driver/Env/Types.hs - compiler/GHC/Driver/Errors.hs - compiler/GHC/Driver/Errors/Ppr.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Main.hs - compiler/GHC/Driver/Make.hs - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Driver/Pipeline/Execute.hs - compiler/GHC/Driver/Session.hs - + compiler/GHC/Driver/Session/Inspect.hs - compiler/GHC/Hs/Binds.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/ImpExp.hs - compiler/GHC/HsToCore.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Breakpoints.hs - compiler/GHC/HsToCore/Docs.hs - compiler/GHC/HsToCore/Errors/Ppr.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Foreign/Call.hs - compiler/GHC/HsToCore/Pmc/Solver.hs - compiler/GHC/HsToCore/Pmc/Solver/Types.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/HsToCore/Ticks.hs - compiler/GHC/HsToCore/Usage.hs - compiler/GHC/Iface/Decl.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Iface/Ext/Binary.hs - compiler/GHC/Iface/Ext/Types.hs - compiler/GHC/Iface/Load.hs - compiler/GHC/Iface/Make.hs - compiler/GHC/Iface/Recomp.hs - compiler/GHC/Iface/Recomp/Types.hs - compiler/GHC/Iface/Rename.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Iface/Tidy.hs - compiler/GHC/Iface/Tidy/StaticPtrTable.hs - compiler/GHC/Iface/Type.hs - compiler/GHC/IfaceToCore.hs - compiler/GHC/Linker/Loader.hs - compiler/GHC/Linker/Types.hs - compiler/GHC/Parser.hs-boot - compiler/GHC/Parser.y - compiler/GHC/Parser/Annotation.hs - compiler/GHC/Parser/Errors/Ppr.hs - compiler/GHC/Parser/Errors/Types.hs - compiler/GHC/Parser/HaddockLex.x - compiler/GHC/Parser/Header.hs - compiler/GHC/Parser/Lexer.x - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Parser/PostProcess/Haddock.hs - + compiler/GHC/Parser/PreProcess.hs - + compiler/GHC/Parser/PreProcess/Eval.hs - + compiler/GHC/Parser/PreProcess/Lexer.x - + compiler/GHC/Parser/PreProcess/Macro.hs - + compiler/GHC/Parser/PreProcess/ParsePP.hs - + compiler/GHC/Parser/PreProcess/Parser.y - + compiler/GHC/Parser/PreProcess/ParserM.hs - + compiler/GHC/Parser/PreProcess/State.hs - compiler/GHC/Parser/Utils.hs - compiler/GHC/Plugins.hs - compiler/GHC/Rename/HsType.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/Rename/Names.hs - compiler/GHC/Rename/Splice.hs - compiler/GHC/Runtime/Debugger/Breakpoints.hs - compiler/GHC/Runtime/Eval.hs - compiler/GHC/Runtime/Eval/Types.hs - compiler/GHC/Runtime/Heap/Inspect.hs - compiler/GHC/Runtime/Interpreter.hs - compiler/GHC/Runtime/Interpreter/Types.hs - compiler/GHC/Settings.hs - compiler/GHC/Settings/IO.hs - compiler/GHC/Stg/BcPrep.hs - compiler/GHC/Stg/FVs.hs - compiler/GHC/Stg/Lint.hs - compiler/GHC/Stg/Unarise.hs - compiler/GHC/StgToByteCode.hs - compiler/GHC/StgToCmm.hs - compiler/GHC/StgToCmm/DataCon.hs - compiler/GHC/StgToCmm/InfoTableProv.hs - compiler/GHC/StgToCmm/Layout.hs - compiler/GHC/StgToCmm/Prim.hs - compiler/GHC/StgToJS/Prim.hs - compiler/GHC/StgToJS/StaticPtr.hs - compiler/GHC/SysTools/BaseDir.hs - compiler/GHC/SysTools/Cpp.hs - compiler/GHC/SysTools/Process.hs - compiler/GHC/SysTools/Tasks.hs - compiler/GHC/Tc/Deriv.hs - compiler/GHC/Tc/Deriv/Generics.hs - compiler/GHC/Tc/Deriv/Infer.hs - compiler/GHC/Tc/Deriv/Utils.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Gen/Bind.hs - compiler/GHC/Tc/Gen/Export.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Gen/Expr.hs-boot - compiler/GHC/Tc/Gen/Head.hs - compiler/GHC/Tc/Gen/HsType.hs - compiler/GHC/Tc/Gen/Match.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Gen/Splice.hs - compiler/GHC/Tc/Gen/Splice.hs-boot - 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+ utils/haddock/html-test/ref/Bug25739.html - + utils/haddock/html-test/src/Bug25739.hs - utils/hsc2hs - utils/jsffi/dyld.mjs The diff was not included because it is too large. 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