Simon Peyton Jones pushed to branch wip/T20264 at Glasgow Haskell Compiler / GHC Commits: 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. - - - - - ac5859b9 by sheaf at 2025-09-16T14:58:38-04:00 Add 'Outputable Natural' instance This commit adds an Outputable instance for the Natural natural-number type, as well as a "natural :: Natural -> SDoc" function that mirrors the existing "integer" function. - - - - - d48ebc23 by Cheng Shao at 2025-09-16T14:59:18-04:00 autoconf: emit warning instead of error for FIND_PYTHON logic This patch makes FIND_PYTHON logic emit warning instead of error, so when the user doesn't expect to run the testsuite driver (especially when installing a bindist), python would not be mandatory. Fixes #26347. - - - - - 54b5950e by Sylvain Henry at 2025-09-17T04:45:18-04:00 Print fully qualified unit names in name mismatch It's more user-friendly to directly print the right thing instead of requiring the user to retry with the additional `-dppr-debug` flag. - - - - - 403cb665 by Ben Gamari at 2025-09-17T04:46:00-04:00 configure: Fix consistency between distrib and source CC check Previously distrib/configure.ac did not include `cc`. Closes #26394. - - - - - 2dcd4cb9 by Oleg Grenrus at 2025-09-17T04:46:41-04:00 Use isPrint in showUnique The comment say ``` -- Avoid emitting non-printable characters in pretty uniques. See #25989. ``` so let the code do exactly that. There are tags (at least : and 0 .. 9) which weren't in A .. z range. - - - - - e5dd754b by Oleg Grenrus at 2025-09-17T04:46:42-04:00 Shorten in-module links in hyperlinked source Instead of href="This.Module#ident" to just "#ident" - - - - - 63189b2c by Oleg Grenrus at 2025-09-17T04:46:42-04:00 Use showUnique in internalAnchorIdent Showing the key of Unique as a number is generally not a great idea. GHC Unique has a tag in high bits, so the raw number is unnecessarily big. So now we have ```html <a href="#l-rvgK"><span class="hs-identifier hs-var hs-var">bar</span></a> ``` instead of ```html <a href="#local-6989586621679015689"><span class="hs-identifier hs-var hs-var">bar</span></a> ``` Together with previous changes of shorter intra-module links the effect on compressed files is not huge, that is expected as we simply remove repetitive contents which pack well. ``` 12_694_206 Agda-2.9.0-docs-orig.tar.gz 12_566_065 Agda-2.9.0-docs.tar.gz ``` However when unpacked, the difference can be significant, e.g. Agda's largest module source got 5% reduction: ``` 14_230_117 Agda.Syntax.Parser.Parser.html 13_422_109 Agda.Syntax.Parser.Parser.html ``` The whole hyperlinked source code directory got similar reduction ``` 121M Agda-2.9.0-docs-orig/src 114M Agda-2.9.0-docs/src ``` For the reference, sources are about 2/3 of the generated haddocks ``` 178M Agda-2.9.0-docs-old 172M Agda-2.9.0-docs ``` so we get around 3.5% size reduction overall. Not bad for a small local changes. - - - - - 6f63f57b by Stefan Schulze Frielinghaus at 2025-09-17T04:47:22-04:00 rts: Fix alignment for gen_workspace #26334 After a0fa4941903272c48b050d24e93eec819eff51bd bootstrap is broken on s390x and errors out with rts/sm/GCThread.h:207:5: error: error: alignment of array elements is greater than element size 207 | gen_workspace gens[]; | ^~~~~~~~~~~~~ The alignment constraint is applied via the attribute to the type gen_workspace and leaves the underlying type struct gen_workspace_ untouched. On Aarch64, x86, and s390x the struct has a size of 128 bytes. On Aarch64 and x86 the alignments of 128 and 64 are divisors of the size, respectively, which is why the type is a viable member type for an array. However, on s390x, the alignment is 256 and therefore is not a divisor of the size and hence cannot be used for arrays. Basically I see two fixes here. Either decrease the alignment requirement on s390x, or by applying the alignment constraint on the struct itself. The former might affect performance as noted in a0fa4941903272c48b050d24e93eec819eff51bd. The latter introduces padding bits whenever necessary in order to ensure that sizeof(gen_workspace[N])==N*sizeof(gen_workspace) holds which is done by this patch. - - - - - 06d25623 by Cheng Shao at 2025-09-17T19:32:27-04:00 ghci: add :shell command This patch adds a new :shell command to ghci which works similarly to :!, except it guarantees to run the command via sh -c. On POSIX hosts the behavior is identical to :!, but on Windows it uses the msys2 shell instead of system cmd.exe shell. This is convenient when writing simple ghci scripts that run simple POSIX commands, and the behavior can be expected to be coherent on both Windows and POSIX. Co-authored-by: Codex - - - - - 186054f7 by Cheng Shao at 2025-09-17T19:32:27-04:00 testsuite: remove legacy :shell trick This commit makes use of the built-in :shell functionality in ghci in the test cases, and remove the legacy :shell trick. - - - - - 0a3a4aa3 by Cheng Shao at 2025-09-17T19:32:27-04:00 docs: document :shell in ghci This commit documents the :shell command in ghci. Co-authored-by: Codex - - - - - a4ff12bb by Cheng Shao at 2025-09-17T19:33:09-04:00 ghc-internal: fix codepages program codepages was not properly updated during the base -> ghc-internal migration, this commit fixes it. - - - - - 7e094def by Cheng Shao at 2025-09-17T19:33:09-04:00 ghc-internal: relax ucd2haskell cabal upper bounds This commit relaxes ucd2haskell cabal upper bounds to make it runnable via ghc 9.12/9.14. - - - - - 7077c9f7 by Cheng Shao at 2025-09-17T19:33:09-04:00 ghc-internal: update to unicode 17.0.0 This commit updates the generated code in ghc-internal to match unicode 17.0.0. - - - - - cef8938f by sheaf at 2025-09-17T19:34:09-04:00 Bad record update msg: allow out-of-scope datacons This commit ensures that, when we encounter an invalid record update (because no constructor exists which contains all of the record fields mentioned in the record update), we graciously handle the situation in which the constructors themselves are not in scope. In that case, instead of looking up the constructors in the GlobalRdrEnv, directly look up their GREInfo using the lookupGREInfo function. Fixes #26391 - - - - - a2d9d7c2 by sheaf at 2025-09-17T19:34:09-04:00 Improve Notes about disambiguating record updates This commit updates the notes [Disambiguating record updates] and [Type-directed record disambiguation], in particular adding more information about the deprecation status of type-directed disambiguation of record updates. - - - - - de44e69e by sheaf at 2025-09-19T05:16:51-04:00 Enable TcM plugins in initTc This commit ensures that we run typechecker plugins and defaulting plugins whenever we call initTc. In particular, this ensures that the pattern-match checker, which calls 'initTcDsForSolver' which calls 'initTc', runs with typechecker plugins enabled. This matters for situations like: merge :: Vec n a -> Vec n a -> Vec (2 * n) a merge Nil Nil = Nil merge (a <: as) (b <: bs) = a :< (b <: merge as bs) in which we need the typechecker plugin to run in order to tell us that the Givens would be inconsistent in the additional equation merge (_ <: _) Nil and thus that the equation is not needed. Fixes #26395 - - - - - 2c378ad2 by Cheng Shao at 2025-09-19T05:17:33-04:00 rel-eng: update fedora image to 42 This patch is a part of #25876 and updates fedora image to 42. - - - - - 0a9d9ffc by Sylvain Henry at 2025-09-19T13:12:14-04:00 Fix output of T14999 (#23685) Fix output of T14999 to: - take into account the +1 offset to DW_AT_low_pc (see Note [Info Offset]) - always use Intel's syntax to force consistency: it was reported that sometimes GDB prints `jmpq` instead of `jmp` with the AT&T syntax - - - - - 1480872a by Vladislav Zavialov at 2025-09-19T13:12:54-04:00 Fix PREP_MAYBE_LIBRARY in prep_target_file.m4 This change fixes a configure error introduced in: commit 8235dd8c4945db9cb03e3be3c388d729d576ed1e ghc-toolchain: Move UseLibdw to per-Target file Now the build no longer fails with: acghc-toolchain: Failed to read a valid Target value from hadrian/cfg/default.target - - - - - d1d9e39e by Ben Gamari at 2025-09-19T18:24:52-04:00 StgToByteCode: Don't assume that data con workers are nullary Previously StgToByteCode assumed that all data-con workers were of a nullary representation. This is not a valid assumption, as seen in #23210, where an unsaturated application of a unary data constructor's worker resulted in invalid bytecode. Sadly, I have not yet been able to reduce a minimal testcase for this. Fixes #23210. - - - - - 3eeecd50 by Ben Gamari at 2025-09-19T18:24:53-04:00 testsuite: Mark T23146* as unbroken - - - - - 2e73f342 by sheaf at 2025-09-19T18:24:53-04:00 Add test for #26216 - - - - - c2efb912 by Sven Tennie at 2025-09-19T18:25:36-04:00 Generate correct test header This increases convenience when copying & pasting... - - - - - d2fb811e by Sven Tennie at 2025-09-19T18:25:36-04:00 foundation test: Fix shift amount (#26248) Shift primops' results are only defined for shift amounts of 0 to word size - 1. The approach is similar to testing div-like operations (which have a constraint regarding zero operands.) This was partly vibe coded (https://github.com/supersven/ghc/pull/1) but then heavily refactored. - - - - - a62ce115 by Andreas Klebinger at 2025-09-19T18:26:18-04:00 Tweak jspace test I've given it a longer timeout, and tweaked the test file generation to speed it up a bit. Hopefully that is enough to make it constentily pass. Last but not least it now also always uses three threads. - - - - - 0f034942 by Cheng Shao at 2025-09-19T18:26:59-04:00 rts: remove obsolete CC_SUPPORTS_TLS logic This patch removes obsolete CC_SUPPORTS_TLS logic throughout the rts, given __thread is now uniformly supported by C toolchains of all platforms we currently support. - - - - - ef705655 by Cheng Shao at 2025-09-19T18:27:41-04:00 rts: remove obsolete HAS_VISIBILITY_HIDDEN logic This patch removes obsolete HAS_VISIBILITY_HIDDEN logic throughout the rts, given __attribute__((visibility("hidden"))) is uniformly supported by C toolchains of all platforms we currently support. - - - - - 9fdc1f7d by Cheng Shao at 2025-09-19T18:28:21-04:00 rts: remove -O3 pragma hack in Hash.c This patch removes an obsolete gcc pragma to specify -O3 in Hash.c. Hadrian already passes the right flag. - - - - - b8cfa8f7 by Cheng Shao at 2025-09-19T18:29:01-04:00 rts: remove obsolete COMPILING_WINDOWS_DLL logic This patch removes obsolete COMPILING_WINDOWS_DLL logic throughout the rts. They were once used for compiling to win32 DLLs, but we haven't been able to compile Haskell units to win32 DLLs for many years now, due to PE format's restriction of no more than 65536 exported symbols in a single DLL. - - - - - bb760611 by Cheng Shao at 2025-09-19T18:29:42-04:00 wasm: bump browser_wasi_shim to 0.4.2 This patch bumps the browser_wasi_shim dependency of wasm dyld script to 0.4.2. - - - - - 8b0940db by Cheng Shao at 2025-09-20T06:48:05-04:00 compiler: move Binary instance of Map to GHC.Utils.Binary This patch moves `Binary` instance of `Map` from `haddock-api` to `GHC.Utils.Binary`. This also allows us to remove a redundant instance defined for `NameEntityInfo`, which is a type synonym for `Map`. - - - - - 4a8fed75 by Vladislav Zavialov at 2025-09-20T06:48:47-04:00 Fix keyword in ExplicitNamespaces error message (#26418) Consider this module header and the resulting error: {-# LANGUAGE NoExplicitNamespaces #-} module T26418 (data HeadC) where -- error: [GHC-47007] -- Illegal keyword 'type' Previously, the error message would mention 'type' (as shown above), even though the user wrote 'data'. This has now been fixed. The error location has also been corrected: it is now reported at the keyword position rather than at the position of the associated import/export item. - - - - - 867c2675 by Cheng Shao at 2025-09-20T06:49:28-04:00 wasm: fix dyld handling for forward declared GOT.func items This patch fixes wasm shared linker's handling of forward declared GOT.func items, see linked issue for details. Also adds T26430 test to witness the fix. Fixes #26430. Co-authored-by: Codex - - - - - e7df6cc0 by Simon Peyton Jones at 2025-09-23T14:34:39-04:00 Improve pretty printer for HsExpr Given a very deeply-nested application, it just kept printing deeper and deeper. This small change makes it cut off. Test is in #26330, but we also get a dramatic decrease in compile time for perf/compiler/InstanceMatching: InstanceMatching 4,086,884,584 1,181,767,232 -71.1% GOOD Why? Because before we got a GIGANTIC error message that took ages to pretty-print; now we get this much more civilised message (I have removed some whitespace.) Match.hs:1007:1: error: • No instance for ‘Show (F001 a)’ arising from a use of ‘showsPrec’ • In the second argument of ‘showString’, namely ‘(showsPrec 11 b1 (GHC.Internal.Show.showSpace (showsPrec 11 b2 (GHC.Internal.Show.showSpace (showsPrec 11 b3 (GHC.Internal.Show.showSpace (showsPrec 11 b4 (GHC.Internal.Show.showSpace (showsPrec 11 b5 (GHC.Internal.Show.showSpace (showsPrec 11 b6 (GHC.Internal.Show.showSpace (showsPrec ...)))))))))))))’ ----------------------- The main payload is * At the start of `pprExpr` * In the defn of `pprApp` A little bit of refactoring: * It turned out that we were setting the default cut-off depth to a fixed value in two places, so changing one didn't change the other. See defaultSDocDepth and defaultSDocCols * I refactored `pprDeeperList` a bit so I could understand it better. Because the depth calculation has changed, there are lots of small error message wibbles. Metric Decrease: InstanceMatching - - - - - 209f0158 by Simon Peyton Jones at 2025-09-23T14:34:39-04:00 Use Outputable.ellipsis rather than text "..." - - - - - 64bb0e37 by Sylvain Henry at 2025-09-23T14:35:56-04:00 deriveConstants: automatically pass -fcommon CC flag (#26393) By mistake we tried to use deriveConstants without passing `--gcc-flag -fcommon` (which Hadrian does) and it failed. This patch: 1. adds parsing support for constants stored in the .bss section (i.e. when -fcommon isn't passed) 2. enables passing `-fcommon` automatically to the C compiler because Windows requires this for subtle reasons 3. Documents the subtle reasons (1) isn't strictly necessary because we always do (2) but it does no harm and it is still useful if the CC flags ever contain -fno-common - - - - - afcdf92f by Oleg Grenrus at 2025-09-23T14:36:41-04:00 Don't wrap spaces in <span>s Doing similar comparison as in 63189b2ceca07edf4e179f4180ca60d470c62cb3 With this change the gzipped documentation is now 2% smaller (previously 1%) 12_694_206 Agda-2.9.0-docs-orig.tar.gz 12_436_829 Agda-2.9.0-docs.tar.gz Unzipped docs are 5% smaller (previously 3%) 178M Agda-2.9.0-docs-orig 169M Agda-2.9.0-docs Individual hyperlinked sources are around 7-10% smaller (previously 5%) (`Parser` module is generated by happy and has relatively little whitespace) 14_230_117 Agda.Syntax.Parser.Parser.html 13_220_758 Agda.Syntax.Parser.Parser.html Agda's hyperlinked sources are 9% smaller now: 121M Agda-2.9.0-docs-orig/src 110M Agda-2.9.0-docs/src - - - - - 67de53a6 by Cheng Shao at 2025-09-23T14:37:31-04:00 rts: remove obsolete __GNUC__ related logic This patch removes obsolete `__GNUC__` related logic, given on any currently supported platform and toolchain, `__GNUC__ >= 4` is universally true. Also pulls some other weeds and most notably, use `__builtin___clear_cache` for clang as well, since clang has supported this gcc intrinsic since 2014, see https://github.com/llvm/llvm-project/commit/c491a8d4577052bc6b3b4c72a7db6a7c.... - - - - - c4d32493 by Sven Tennie at 2025-09-23T20:40:57-04:00 RV64: Fix: Add missing truncation to MO_S_Shr (#26248) Sub-double word (>=` It took me twenty years of contemplation to realize why it's called that. I therefore feel that it may not be obvious to beginners. - - - - - e9c5e46f by Brandon Chinn at 2025-09-25T09:48:36-04:00 Fix tabs in string gaps (#26415) Tabs in string gaps were broken in bb030d0d because previously, string gaps were manually parsed, but now it's lexed by the usual Alex grammar and post-processed after successful lexing. It broke because of a discrepancy between GHC's lexer grammar and the Haskell Report. The Haskell Report includes tabs in whitechar: whitechar → newline | vertab | space | tab | uniWhite $whitechar used to include tabs until 18 years ago, when it was removed in order to exclude tabs from $white_no_nl in order to warn on tabs: 6e202120. In this MR, I'm adding \t back into $whitechar, and explicitly excluding \t from the $white_no_nl+ rule ignoring all whitespace in source code, which more accurately colocates the "ignore all whitespace except tabs, which is handled in the next line" logic. As a side effect of this MR, tabs are now allowed in pragmas; currently, a pragma written as {-# \t LANGUAGE ... #-} is interpreted as the tab character being the pragma name, and GHC warns "Unrecognized pragma". With this change, tabs are ignored as whitespace, which more closely matches the Report anyway. - - - - - 8bf5b309 by Cheng Shao at 2025-09-25T09:49:18-04:00 wasm: remove the --no-turbo-fast-api-calls hack from dynamic linker shebang This patch removes the `--no-turbo-fast-api-calls` hack from the dyld script shebang; it was used to workaround v8 fast call coredumps in nodejs and no longer needed, and comes with a performance penalty, hence the removal. - - - - - c1cab0c3 by Sylvain Henry at 2025-09-26T10:36:30-04:00 Revert "Add necessary flag for js linking" This reverts commit 84f68e2231b2eddb2e1dc4e90af394ef0f2e803f. This commit didn't have the expected effect. See discussion in #26290. Instead we export HEAP8 and HEAPU8 from rts/js/mem.js - - - - - 0a434a80 by Sylvain Henry at 2025-09-26T10:36:30-04:00 JS: export HEAPU8 (#26290) This is now required by newer Emscripten versions. - - - - - b10296a9 by Andreas Klebinger at 2025-09-26T10:37:11-04:00 sizeExpr: Improve Tick handling. When determining if we scrutinize a function argument we now properly look through ticks. Fixes #26444. - - - - - d9e2a9a7 by mniip at 2025-09-26T16:00:50-04:00 rts: Refactor parsing of -h flags We have a nontrivial amount of heap profiling flags available in the non-profiled runtime, so it makes sense to reuse the parsing code between the profiled and the non-profiled runtime, only restricting which flags are allowed. - - - - - 089e45aa by mniip at 2025-09-26T16:00:50-04:00 rts: Fix parsing of -h options with braces When the "filter by" -h options were introduced in bc210f7d267e8351ccb66972f4b3a650eb9338bb, the braces were mandatory. Then in 3c22fb21fb18e27ce8d941069a6915fce584a526, the braces were made optional. Then in d1ce35d2271ac8b79cb5e37677b1a989749e611c the brace syntax stopped working, and no one seems to have noticed. - - - - - 423f1472 by mniip at 2025-09-26T16:00:50-04:00 rts: add -hT<type> and -hi<table id> heap filtering options (#26361) They are available in non-profiled builds. Along the way fixed a bug where combining -he<era> and -hr<retainer> would ignore whether the retainer matches or not. - - - - - 4cda4785 by mniip at 2025-09-26T16:00:50-04:00 docs: Document -hT<type> and -hi<addr> - - - - - 982ad30f by mniip at 2025-09-26T16:00:50-04:00 rts: Refactor dumping the heap census Always do the printing of the total size right next to where the bucket label is printed. This prevents accidentally printing a label without the corresponding amount. Fixed a bug where exactly this happened for -hi profile and the 0x0 (uncategorized) info table. There is now also much more symmetry between fprintf(hp_file,...) and the corresponding traceHeapProfSampleString. - - - - - 8cbe006a by Cheng Shao at 2025-09-26T16:01:34-04:00 hadrian: fix GHC.Platform.Host generation for cross stage1 This patch fixes incorrectly GHC.Platform.Host generation logic for cross stage1 in hadrian (#26449). Also adds T26449 test case to witness the fix. Co-authored-by: Codex - - - - - 0ddd0fdc by soulomoon at 2025-09-28T19:24:10-04:00 Remove hptAllInstances usage during upsweep Previously, during the upsweep phase when checking safe imports, we were loading the module interface with runTcInteractive, which in turn calls hptAllInstances. This accesses non-below modules from the home package table. Change the implementation of checkSafeImports to use initTcWithGbl and loadSysInterface to load the module interface, since we already have TcGblEnv at hand. This eliminates the unnecessary use of runTcInteractive and hptAllInstances during the upsweep phase. - - - - - e05c496c by Ben Gamari at 2025-09-28T19:24:59-04:00 base: Update changelog to reflect timing of IOPort# removal This change will make 9.14 afterall. - - - - - bdc9d130 by Cheng Shao at 2025-09-28T19:25:45-04:00 rts: fix wasm JSFFI initialization constructor code This commit fixes wasm JSFFI initialization constructor code so that the constructor is self-contained and avoids invoking a fake __main_argc_argv function. The previous approach of reusing __main_void logic in wasi-libc saves a tiny bit of code, at the expense of link-time trouble whenever GHC links a wasm module without -no-hs-main, in which case the driver-generated main function would clash with the definition here, resulting in a linker error. It's simply better to avoid messing with the main function, and it would additionally allow linking wasm32-wasi command modules that does make use of synchronous JSFFI. - - - - - 5d59fc8f by Cheng Shao at 2025-09-28T19:26:27-04:00 rts: provide stub implementations of ExecPage functions for wasm This patch provides stub implementations of ExecPage functions for wasm. They are never actually invoked at runtime for any non-TNTC platform, yet they can cause link-time errors of missing symbols when the GHCi.InfoTable module gets linked into the final wasm module (e.g. a GHC API program). - - - - - a4d664c7 by Cheng Shao at 2025-09-29T17:29:22+02:00 compiler/ghci: replace the LoadDLL message with LoadDLLs As a part of #25407, this commit changes the LoadDLL message to LoadDLLs, which takes a list of DLL paths to load and returns the list of remote pointer handles. The wasm dyld is refactored to take advantage of LoadDLLs and harvest background parallelism. On other platforms, LoadDLLs is based on a fallback codepath that does sequential loading. The driver is not actually emitting singular LoadDLLs message with multiple DLLs yet, this is left in subsequent commits. Co-authored-by: Codex - - - - - c7fc4bae by Cheng Shao at 2025-09-29T17:29:22+02:00 driver: separate downsweep/upsweep phase in loadPackages' This commit refactors GHC.Linker.Loader.loadPackages' to be separated into downsweep/upsweep phases: - The downsweep phase performs dependency analysis and generates a list of topologically sorted packages to load - The upsweep phase sequentially loads these packages by calling loadPackage This is a necessary refactoring to make it possible to make loading of DLLs concurrent. - - - - - ab180104 by Cheng Shao at 2025-09-29T17:57:19+02:00 driver: emit single LoadDLLs message to load multiple DLLs This commit refactors the driver so that it emits a single LoadDLLs message to load multiple DLLs in GHC.Linker.Loader.loadPackages'. Closes #25407. ------------------------- Metric Increase: MultiLayerModulesTH_OneShot TcPlugin_RewritePerf ------------------------- Co-authored-by: Codex - - - - - 9c304ec0 by Sean D. Gillespie at 2025-09-29T19:57:07-04:00 Fix SIZED_BIN_OP_TY_INT casts in RTS interpreter Correct `SIZED_BIN_OP_TY_INT` cast to integer. Previously, it cast its second operand as its parameter `ty`. This does not currently cause any issues, since we are only using it for bit shifts. Fixes #26287 - - - - - a1de535f by Luite Stegeman at 2025-09-30T18:40:28-04:00 rts: Fix lost wakeups in threadPaused for threads blocked on black holes The lazy blackholing code in threadPaused could overwrite closures that were already eagerly blackholed, and as such wouldn't have a marked update frame. If the black hole was overwritten by its original owner, this would lead to an undetected collision, and the contents of any existing blocking queue being lost. This adds a check for eagerly blackholed closures and avoids overwriting their contents. Fixes #26324 - - - - - b7e21e49 by Luite Stegeman at 2025-09-30T18:40:28-04:00 rts: push the correct update frame in stg_AP_STACK The frame contains an eager black hole (__stg_EAGER_BLACKHOLE_info) so we should push an stg_bh_upd_frame_info instead of an stg_upd_frame_info. - - - - - 02a7c18a by Cheng Shao at 2025-09-30T18:41:27-04:00 ghci: fix lookupSymbolInDLL behavior on wasm This patch fixes lookupSymbolInDLL behavior on wasm to return Nothing instead of throwing. On wasm, we only have lookupSymbol, and the driver would attempt to call lookupSymbolInDLL first before falling back to lookupSymbol, so lookupSymbolInDLL needs to return Nothing gracefully for the fallback behavior to work. - - - - - aa0ca5e3 by Cheng Shao at 2025-09-30T18:41:27-04:00 hadrian/compiler: enable internal-interpreter for ghc library in wasm stage1 This commit enables the internal-interpreter flag for ghc library in wasm stage1, as well as other minor adjustments to make it actually possible to launch a ghc api session that makes use of the internal interpreter. Closes #26431 #25400. - - - - - 69503668 by Cheng Shao at 2025-09-30T18:41:27-04:00 testsuite: add T26431 test case This commit adds T26431 to testsuite/tests/ghci-wasm which goes through the complete bytecode compilation/linking/running pipeline in wasm, so to witness that the ghc shared library in wasm have full support for internal-interpreter. - - - - - e9445c01 by Matthew Pickering at 2025-09-30T18:42:23-04:00 driver: Load bytecode static pointer entries during linking Previously the entries were loaded too eagerly, during upsweep, but we should delay loading them until we know that the relevant bytecode object is demanded. Towards #25230 - - - - - b8307eab by Cheng Shao at 2025-09-30T18:43:14-04:00 autoconf/ghc-toolchain: remove obsolete C99 check This patch removes obsolete c99 check from autoconf/ghc-toolchain. For all toolchain & platform combination we support, gnu11 or above is already supported without any -std flag required, and our RTS already required C11 quite a few years ago, so the C99 check is completely pointless. - - - - - 9c293544 by Simon Peyton Jones at 2025-10-01T09:36:10+01:00 Fix buglet in GHC.Core.Unify.uVarOrFam We were failing to match two totally-equal types! This led to #26457. - - - - - 554487a7 by Rodrigo Mesquita at 2025-10-01T23:04:43-04:00 cleanup: Drop obsolete comment about HsConDetails HsConDetails used to have an argument representing the type of the tyargs in a list: data HsConDetails tyarg arg rec = PrefixCon [tyarg] [arg] This datatype was shared across 3 synonyms: HsConPatDetails, HsConDeclH98Details, HsPatSynDetails. In the latter two cases, `tyarg` was instanced to `Void` meaning the list was always empty for these cases. In 7b84c58867edca57a45945a20a9391724db6d9e4, this was refactored such that HsConDetails no longer needs a type of tyargs by construction. The first case now represents the type arguments in the args type itself, with something like: ConPat "MkE" [InvisP tp1, InvisP tp2, p1, p2] So the deleted comment really is just obsolete. Fixes #26461 - - - - - 6992ac09 by Cheng Shao at 2025-10-02T07:27:55-04:00 testsuite: remove unused expected output files This patch removes unused expected output files in the testsuites on platforms that we no longer support. - - - - - 39eaaaba by Ben Gamari at 2025-10-02T07:28:45-04:00 rts: Dynamically initialize built-in closures To resolve #26166 we need to eliminate references to undefined symbols in the runtime system. One such source of these is the runtime's static references to `I#` and `C#` due the `stg_INTLIKE` and `stg_CHARLIKE` arrays. To avoid this we make these dynamic, initializing them during RTS start-up. - - - - - c254c54b by Cheng Shao at 2025-10-02T07:29:33-04:00 compiler: only invoke keepCAFsForGHCi if internal-interpreter is enabled This patch makes the ghc library only invoke keepCAFsForGHCi if internal-interpreter is enabled. For cases when it's not (e.g. the host build of a cross ghc), this avoids unnecessarily retaining all CAFs in the heap. Also fixes the type signature of c_keepCAFsForGHCi to match the C ABI. - - - - - c9ec4d43 by Simon Hengel at 2025-10-02T18:42:20-04:00 Update copyright in documentation - - - - - da9633a9 by Matthew Pickering at 2025-10-02T18:43:04-04:00 loader: Unify loadDecls and loadModuleLinkables functions These two functions nearly did the same thing. I have refactored them so that `loadDecls` now calls `loadModuleLinkables`. Fixes #26459 - - - - - 5db98d80 by Simon Hengel at 2025-10-02T18:43:53-04:00 Fix typo - - - - - 1275d360 by Matthew Pickering at 2025-10-03T06:05:56-04:00 testsuite: Use ghci_ways to set ways in PackedDataCon/UnboxedTuples/UnliftedDataTypeInterp tests These tests reimplemented the logic from `valid_way` in order to determine what ways to run. It's easier to use this combination of `only_ways` and `extra_ways` to only run in GHCi ways and always run in GHCi ways. - - - - - c06b534b by Matthew Pickering at 2025-10-03T06:06:40-04:00 Rename interpreterBackend to bytecodeBackend This is preparation for creating bytecode files. The "interpreter" is one way in which we can run bytecode objects. It is more accurate to describe that the backend produces bytecode, rather than the means by which the code will eventually run. The "interpreterBackend" binding is left as a deprecated alias. - - - - - 41bdb16f by Andreas Klebinger at 2025-10-06T18:04:34-04:00 Add a perf test for #26425 - - - - - 1da0c700 by Andreas Klebinger at 2025-10-06T18:05:14-04:00 Testsuite: Silence warnings about Wx-partial in concprog001 - - - - - 7471eb6a by sheaf at 2025-10-07T21:39:43-04:00 Improve how we detect user type errors in types This commit cleans up all the code responsible for detecting whether a type contains "TypeError msg" applications nested inside it. All the logic is now in 'userTypeError_maybe', which is always deep. Whether it looks inside type family applications is determined by the passed-in boolean flag: - When deciding whether a constraint is definitely insoluble, don't look inside type family applications, as they may still reduce -- in which case the TypeError could disappear. - When reporting unsolved constraints, look inside type family applications: they had the chance to reduce but didn't, and the custom type error might contain valuable information. All the details are explained in Note [Custom type errors in constraints] in GHC.Tc.Types.Constraint. Another benefit of this change is that it allows us to get rid of the deeply dodgy 'getUserTypeErrorMsg' function. This commit also improves the detection of custom type errors, for example in equality constraints: TypeError blah ~# rhs It used to be the case that we didn't detect the TypeError on the LHS, because we never considered that equality constraints could be insoluble due to the presence of custom type errors. Addressing this oversight improves detection of redundant pattern match warnings, fixing #26400. - - - - - 29955267 by Rodrigo Mesquita at 2025-10-07T21:40:25-04:00 cleanup: Drop obsolete settings from config.mk.in These values used to be spliced into the bindist's `config.mk` s.t. when `make` was run, the values were read and written into the bindist installation `settings` file. However, we now carry these values to the bindist directly in the default.target toolchain file, and `make` writes almost nothing to `settings` now (see #26227) The entries deleted in this MR were already unused. Fixes #26478 - - - - - f7adfed2 by ARATA Mizuki at 2025-10-08T08:37:24-04:00 T22033 is only relevant if the word size is 64-bit Fixes #25497 - - - - - ff1650c9 by Ben Gamari at 2025-10-08T08:38:07-04:00 rts/posix: Enforce iteration limit on heap reservation logic Previously we could loop indefinitely when attempting to get an address space reservation for our heap. Limit the logic to 8 iterations to ensure we instead issue a reasonable error message. Addresses #26151. - - - - - 01844557 by Ben Gamari at 2025-10-08T08:38:07-04:00 rts/posix: Hold on to low reservations when reserving heap Previously when the OS gave us an address space reservation in low memory we would immediately release it and try again. However, on some platforms this meant that we would get the same allocation again in the next iteration (since mmap's `hint` argument is just that, a hint). Instead we now hold on to low reservations until we have found a suitable heap reservation. Fixes #26151. - - - - - b2c8d052 by Sven Tennie at 2025-10-08T08:38:47-04:00 Build terminfo only in upper stages in cross-builds (#26288) Currently, there's no way to provide library paths for [n]curses for both - build and target - in cross-builds. As stage0 is only used to build upper stages, it should be fine to build terminfo only for them. This re-enables building cross-compilers with terminfo. - - - - - c58f9a61 by Julian Ospald at 2025-10-08T08:39:36-04:00 ghc-toolchain: Drop `ld.gold` from merge object command It's deprecated. Also see #25716 - - - - - 2b8baada by sheaf at 2025-10-08T18:23:37-04:00 Improvements to 'mayLookIdentical' This commit makes significant improvements to the machinery that decides when we should pretty-print the "invisible bits" of a type, such as: - kind applications, e.g. '@k' in 'Proxy @k ty' - RuntimeReps, e.g. 'TYPE r' - multiplicities and linear arrows 'a %1 -> b' To do this, this commit refactors 'mayLookIdentical' to return **which** of the invisible bits don't match up, e.g. in (a %1 -> b) ~ (a %Many -> b) we find that the invisible bit that doesn't match up is a multiplicity, so we should set 'sdocLinearTypes = True' when pretty-printing, and with e.g. Proxy @k1 ~ Proxy @k2 we find that the invisible bit that doesn't match up is an invisible TyCon argument, so we set 'sdocPrintExplicitKinds = True'. We leverage these changes to remove the ad-hoc treatment of linearity of data constructors with 'dataConDisplayType' and 'dataConNonLinearType'. This is now handled by the machinery of 'pprWithInvisibleBits'. Fixes #26335 #26340 - - - - - 129ce32d by sheaf at 2025-10-08T18:23:37-04:00 Store SDoc context in SourceError This commits modifies the SourceError datatype which is used for throwing and then reporting exceptions by storing all the info we need to be able to print the SDoc, including whether we should print with explicit kinds, explicit runtime-reps, etc. This is done using the new datatype: data SourceErrorContext = SEC !DiagOpts !(DiagnosticOpts GhcMessage) Now, when we come to report an error (by handling the exception), we have access to the full context we need. Fixes #26387 - - - - - f9790ca8 by Ben Gamari at 2025-10-08T18:24:19-04:00 gitlab-ci: Make RELEASE_JOB an input Rather than an undocumented variable. - - - - - 14281a22 by Ben Gamari at 2025-10-11T14:06:47-04:00 rts/nonmoving: Fix comment spelling - - - - - bedd38b0 by Ben Gamari at 2025-10-11T14:06:47-04:00 rts/nonmoving: Use atomic operations to update bd->flags - - - - - 215d6841 by Ben Gamari at 2025-10-11T14:06:47-04:00 nonmoving: Use get_itbl instead of explicit loads This is cleaner and also fixes unnecessary (and unsound) use of `volatile`. - - - - - 2c94aa3a by Ben Gamari at 2025-10-11T14:06:47-04:00 rts/Scav: Handle WHITEHOLEs in scavenge_one `scavenge_one`, used to scavenge mutable list entries, may encounter `WHITEHOLE`s when the non-moving GC is in use via two paths: 1. when an MVAR is being marked concurrently 2. when the object belongs to a chain of selectors being short-cutted. Fixes #26204. - - - - - 6bd8155c by Matthew Pickering at 2025-10-11T14:07:29-04:00 Add support for generating bytecode objects This commit adds the `-fwrite-byte-code` option which makes GHC emit a `.gbc` file which contains a serialised representation of bytecode. The bytecode can be loaded by the compiler to avoid having to reinterpret a module when using the bytecode interpreter (for example, in GHCi). There are also the new options: * -gbcdir=<DIR>: Specify the directory to place the gbc files * -gbcsuf=<suffix>: Specify the suffix for gbc files The option `-fbyte-code-and-object-code` now implies `-fwrite-byte-code`. These performance tests fail due to https://github.com/haskell/directory/issues/204 ------------------------- Metric Increase: MultiComponentModules MultiLayerModules MultiComponentModulesRecomp MultiLayerModulesRecomp MultiLayerModulesTH_Make MultiLayerModulesTH_OneShot T13701 ------------------------- The bytecode serialisation part was implemented by Cheng Shao Co-authored-by: Cheng Shao - - - - - dc8f9599 by Matthew Pickering at 2025-10-11T14:07:30-04:00 Revert "Add a perf test for #26425" This test has a large memory spike currently, which makes the test sensitive, since if you allocate a little more or less, the precise location where GC happens shifts and you observe a different part of the spike. Andreas told me to revert the patch for now, and he will add it back when he fixes the memory spike. This reverts commit 41bdb16fd083110a06507248f648c507a2feb4af. - - - - - e10dcd65 by Sven Tennie at 2025-10-12T10:24:56+00:00 T22859: Increase threadDelay for small machines The previously used thread delay led to failures on my RISC-V test setups. - - - - - d59ef6b6 by Hai / @BestYeen at 2025-10-14T21:51:14-04:00 Change Alex and Happy m4 scripts to display which version was found in the system, adapt small formatting details in Happy script to be more like the Alex script again. - - - - - c98abb6a by Hai / @BestYeen at 2025-10-14T21:52:08-04:00 Update occurrences of return to pure and add a sample for redefining :m to mean :main - - - - - 70ee825a by Cheng Shao at 2025-10-14T21:52:50-04:00 testsuite: fix T3586 for non-SSE3 platforms `T3586.hs` contains `-fvia-C -optc-msse3` which I think is a best-effort basis to harvest the C compiler's auto vectorization optimizations via the C backend back when the test was added. The `-fvia-C` part is now a deprecated no-op because GHC can't fall back to the C backend on a non-unregisterised build, and `-optc-msse3` might actually cause the test to fail on non x86/x64 platforms, e.g. recent builds of wasi-sdk would report `wasm32-wasi-clang: error: unsupported option '-msse3' for target 'wasm32-unknown-wasi'`. So this patch cleans up this historical cruft. `-fvia-C` is removed, and `-optc-msse3` is only passed when cpuid contains `pni` (which indicates support of SSE3). - - - - - 4be32153 by Teo Camarasu at 2025-10-15T08:06:09-04:00 Add submodules for template-haskell-lift and template-haskell-quasiquoter These two new boot libraries expose stable subsets of the template-haskell interface. This is an implemenation of the GHC proposal https://github.com/ghc-proposals/ghc-proposals/pull/696 Work towards #25262 - - - - - 0c00c9c3 by Ben Gamari at 2025-10-15T08:06:51-04:00 rts: Eliminate uses of implicit constant arrays Folding of `const`-sized variable-length arrays to a constant-length array is a gnu extension which clang complains about. Closes #26502. - - - - - bf902a1d by Fendor at 2025-10-15T16:00:59-04:00 Refactor distinct constructor tables map construction Adds `GHC.Types.Unique.FM.alterUFM_L`, `GHC.Types.Unique.DFM.alterUDFM_L` `GHC.Data.Word64Map.alterLookup` to support fusion of distinct constructor data insertion and lookup during the construction of the `DataCon` map in `GHC.Stg.Debug.numberDataCon`. Co-authored-by: Fendor Co-authored-by: Finley McIlwaine - - - - - b3585ba1 by Fendor at 2025-10-15T16:00:59-04:00 Allow per constructor refinement of distinct-constructor-tables Introduce `-fno-distinct-constructor-tables`. A distinct constructor table configuration is built from the combination of flags given, in order. For example, to only generate distinct constructor tables for a few specific constructors and no others, just pass `-fdistinct-constructor-tables-only=C1,...,CN`. This flag can be supplied multiple times to extend the set of constructors to generate a distinct info table for. You can disable generation of distinct constructor tables for all configurations by passing `-fno-distinct-constructor-tables`. The various configurations of these flags is included in the `DynFlags` fingerprints, which should result in the expected recompilation logic. Adds a test that checks for distinct tables for various given or omitted constructors. Updates CountDepsAst and CountDepsParser tests to account for new dependencies. Fixes #23703 Co-authored-by: Fendor Co-authored-by: Finley McIlwaine - - - - - e17dc695 by fendor at 2025-10-15T16:01:41-04:00 Fix typos in haddock documentation for stack annotation API - - - - - f85058d3 by Zubin Duggal at 2025-10-17T13:50:52+05:30 compiler: Attempt to systematize Unique tags by introducing an ADT for each different tag Fixes #26264 Metric Decrease: T9233 - - - - - c85c845d by sheaf at 2025-10-17T22:35:32-04:00 Don't prematurely final-zonk PatSyn declarations This commit makes GHC hold off on the final zonk for pattern synonym declarations, in 'GHC.Tc.TyCl.PatSyn.tc_patsyn_finish'. This accommodates the fact that pattern synonym declarations without a type signature can contain unfilled metavariables, e.g. if the RHS of the pattern synonym involves view-patterns whose type mentions promoted (level 0) metavariables. Just like we do for ordinary function bindings, we should allow these metavariables to be settled later, instead of eagerly performing a final zonk-to-type. Now, the final zonking-to-type for pattern synonyms is performed in GHC.Tc.Module.zonkTcGblEnv. Fixes #26465 - - - - - ba3e5bdd by Rodrigo Mesquita at 2025-10-18T16:57:18-04:00 Move code-gen aux symbols from ghc-internal to rts These symbols were all previously defined in ghc-internal and made the dependency structure awkward, where the rts may refer to some of these symbols and had to work around that circular dependency the way described in #26166. Moreover, the code generator will produce code that uses these symbols! Therefore, they should be available in the rts: PRINCIPLE: If the code generator may produce code which uses this symbol, then it should be defined in the rts rather than, say, ghc-internal. That said, the main motivation is towards fixing #26166. Towards #26166. Pre-requisite of !14892 - - - - - f31de2a9 by Ben Gamari at 2025-10-18T16:57:18-04:00 rts: Avoid static symbol references to ghc-internal This resolves #26166, a bug due to new constraints placed by Apple's linker on undefined references. One source of such references in the RTS is the many symbols referenced in ghc-internal. To mitigate #26166, we make these references dynamic, as described in Note [RTS/ghc-internal interface]. Fixes #26166 Co-authored-by: Rodrigo Mesquita Co-authored-by: Cheng Shao - - - - - 43fdfddc by Ben Gamari at 2025-10-18T16:57:18-04:00 compiler: Rename isMathFun -> isLibcFun This set includes more than just math functions. - - - - - 4ed5138f by Ben Gamari at 2025-10-18T16:57:18-04:00 compiler: Add libc allocator functions to libc_funs Prototypes for these are now visible from `Prim.h`, resulting in multiple-declaration warnings in the unregisterised job. - - - - - 9a0a076b by Ben Gamari at 2025-10-18T16:57:18-04:00 rts: Minimize header dependencies of Prim.h Otherwise we will end up with redundant and incompatible declarations resulting in warnings during the unregisterised build. - - - - - 26b8a414 by Diego Antonio Rosario Palomino at 2025-10-18T16:58:10-04:00 Cmm Parser: Fix incorrect example in comment The Parser.y file contains a comment with an incorrect example of textual Cmm (used in .cmm files). This commit updates the comment to ensure it reflects valid textual Cmm syntax. Fixes #26313 - - - - - d4a9d6d6 by ARATA Mizuki at 2025-10-19T18:43:47+09:00 Handle implications between x86 feature flags This includes: * Multiple -msse* options can be specified * -mavx implies -msse4.2 * -mavx2 implies -mavx * -mfma implies -mavx * -mavx512f implies -mavx2 and -mfma * -mavx512{cd,er,pf} imply -mavx512f Closes #24989 Co-authored-by: sheaf - - - - - c9b8465c by Cheng Shao at 2025-10-20T10:16:00-04:00 wasm: workaround WebKit bug in dyld This patch works around a WebKit bug and allows dyld to run on WebKit based platforms as well. See added note for detailed explanation. Co-authored-by: Codex - - - - - 91b6be10 by Julian Ospald at 2025-10-20T18:21:03-04:00 Improve error handling in 'getPackageArchives' When the library dirs in the package conf files are not set up correctly, the JS linker will happily ignore such packages and not link against them, although they're part of the link plan. Fixes #26383 - - - - - 6c5269da by Sven Tennie at 2025-10-20T18:21:44-04:00 Align coding style Improve readability by using the same style for all constructor calls in this function. - - - - - 3d305889 by Sven Tennie at 2025-10-20T18:21:44-04:00 Reduce complexity by removing joins with mempty ldArgs, cArgs and cppArgs are all `mempty`. Thus concatenating them adds nothing but some complexity while reading the code. - - - - - 38d65187 by Matthew Pickering at 2025-10-21T13:12:20+01:00 Fix stack decoding when using profiled runtime There are three fixes in this commit. * We need to replicate the `InfoTable` and `InfoTableProf` approach for the other stack constants (see the new Stack.ConstantsProf file). * Then we need to appropiately import the profiled or non-profiled versions. * Finally, there was an incorrect addition in `stackFrameSize`. We need to cast after performing addition on words. Fixes #26507 - - - - - 17231bfb by fendor at 2025-10-21T13:12:20+01:00 Add regression test for #26507 - - - - - 4f5bf93b by Simon Peyton Jones at 2025-10-25T04:05:34-04:00 Postscript to fix for #26255 This MR has comments only - - - - - 6ef22fa0 by IC Rainbow at 2025-10-26T18:23:01-04:00 Add SIMD primops for bitwise logical operations This adds 128-bit wide and/or/xor instructions for X86 NCG, with both SSE and AVX encodings. ``` andFloatX4# :: FloatX4# -> FloatX4# -> FloatX4# -- andps / vandps andDoubleX2# :: DoubleX2# -> DoubleX2# -> DoubleX2# -- andpd / vandpd andInt8X16# :: Int8X16# -> Int8X16# -> Int8X16# -- pand / vpand ``` The new primops are available on ARM when using LLVM backend. Tests added: - simd015 (floats and doubles) - simd016 (integers) - simd017 (words) Fixes #26417 - - - - - fbdc623a by sheaf at 2025-10-26T18:23:52-04:00 Add hints for unsolved HasField constraints This commit adds hints and explanations for unsolved 'HasField' constraints. GHC will now provide additional explanations for an unsolved constraint of the form 'HasField fld_name rec_ty fld_ty'; the details are laid out in Note [Error messages for unsolved HasField constraints], but briefly: 1. Provide similar name suggestions (e.g. mis-spelled field name) and import suggestions (record field not in scope). These result in actionable 'GhcHints', which is helpful to provide code actions in HLS. 2. Explain why GHC did not solve the constraint, e.g.: - 'fld_name' is not a string literal (e.g. a type variable) - 'rec_ty' is a TyCon without any fields, e.g. 'Int' or 'Bool'. - 'fld_ty' contains existentials variables or foralls. - The record field is a pattern synonym field (GHC does not generate HasField instances for those). - 'HasField' is a custom 'TyCon', not actually the built-in 'HasField' typeclass from 'GHC.Records'. On the way, we slightly refactor the mechanisms for import suggestions in GHC.Rename.Unbound. This is to account for the fact that, for 'HasField', we don't care whether the field is imported qualified or unqualified. 'importSuggestions' was refactored, we now have 'sameQualImportSuggestions' and 'anyQualImportSuggestions'. Fixes #18776 #22382 #26480 - - - - - 99d5707f by sheaf at 2025-10-26T18:23:52-04:00 Rename PatSyn MatchContext to PatSynCtx to avoid punning - - - - - 5dc2e9ea by Julian Ospald at 2025-10-27T18:17:23-04:00 Skip uniques test if sources are not available - - - - - 544b9ec9 by Vladislav Zavialov at 2025-10-27T18:18:06-04:00 Re-export GHC.Hs.Basic from GHC.Hs Clean up some import sections in GHC by re-exporting GHC.Hs.Basic from GHC.Hs. - - - - - 643ce801 by Julian Ospald at 2025-10-28T18:18:55-04:00 rts: remove unneccesary cabal flags We perform those checks via proper autoconf macros instead that do the right thing and then add those libs to the rts buildinfo. - - - - - d69ea8fe by Vladislav Zavialov at 2025-10-28T18:19:37-04:00 Test case for #17705 Starting with GHC 9.12 (the first release to include 5745dbd3), all examples in this ticket are handled as expected. - - - - - 4038a28b by Andreas Klebinger at 2025-10-30T12:38:52-04:00 Add a perf test for #26425 - - - - - f997618e by Andreas Klebinger at 2025-10-30T12:38:52-04:00 OccAnal: Be stricter for better compiler perf. In particular we are now stricter: * When combining usageDetails. * When computing binder info. In combineUsageDetails when combining the underlying adds we compute a new `LocalOcc` for each entry by combining the two existing ones. Rather than wait for those entries to be forced down the road we now force them immediately. Speeding up T26425 by about 10% with little effect on the common case. We also force binders we put into the Core AST everywhere now. Failure to do so risks leaking the occ env used to set the binders OccInfo. For T26425 compiler residency went down by a factor of ~10x. Compile time also improved by a factor of ~1.6. ------------------------- Metric Decrease: T18698a T26425 T9233 ------------------------- - - - - - 5618645b by Vladislav Zavialov at 2025-10-30T12:39:33-04:00 Fix namespace specifiers in subordinate exports (#12488) This patch fixes an oversight in the `lookupChildrenExport` function that caused explicit namespace specifiers of subordinate export items to be ignored: module M (T (type A)) where -- should be rejected data T = A Based on the `IEWrappedName` data type, there are 5 cases to consider: 1. Unadorned name: P(X) 2. Named default: P(default X) 3. Pattern synonym: P(pattern X) 4. Type name: P(type X) 5. Data name: P(data X) Case 1 is already handled correctly; cases 2 and 3 are parse errors; and it is cases 4 and 5 that we are concerned with in this patch. Following the precedent established in `LookupExactName`, we introduce a boolean flag in `LookupChildren` to control whether to look up in all namespaces or in a specific one. If an export item is accompanied by an explicit namespace specifier `type` or `data`, we restrict the lookup in `lookupGRE` to a specific namespace. The newly introduced diagnostic `TcRnExportedSubordinateNotFound` provides error messages and suggestions more tailored to this context than the previously used `reportUnboundName`. - - - - - f75ab223 by Peter Trommler at 2025-10-31T18:43:13-04:00 ghc-toolchain: detect PowerPC 64 bit ABI Check preprocessor macro defined for ABI v2 and assume v1 otherwise. Fixes #26521 - - - - - d086c474 by Peter Trommler at 2025-10-31T18:43:13-04:00 ghc-toolchain: refactor, move lastLine to Utils - - - - - 995dfe0d by Vladislav Zavialov at 2025-10-31T18:43:54-04:00 Tests for -Wduplicate-exports, -Wdodgy-exports Add test cases for the previously untested diagnostics: [GHC-51876] TcRnDupeModuleExport [GHC-64649] TcRnNullExportedModule This also revealed a typo (incorrect capitalization of "module") in the warning text for TcRnDupeModuleExport, which is now fixed. - - - - - f6961b02 by Cheng Shao at 2025-11-01T00:08:01+01:00 wasm: reformat dyld source code This commit reformats dyld source code with prettier, to avoid introducing unnecessary diffs in subsequent patches when they're formatted before committing. - - - - - 0c9032a0 by Cheng Shao at 2025-11-01T00:08:01+01:00 wasm: simplify _initialize logic in dyld This commit simplifies how we _initialize a wasm shared library in dyld and removes special treatment for libc.so, see added comment for detailed explanation. - - - - - ec1b40bd by Cheng Shao at 2025-11-01T00:08:01+01:00 wasm: support running dyld fully client side in the browser This commit refactors the wasm dyld script so that it can be used to load and run wasm shared libraries fully client-side in the browser without needing a wasm32-wasi-ghci backend: - A new `DyLDBrowserHost` class is exported, which runs in the browser and uses the in-memory vfs without any RPC calls. This meant to be used to create a `rpc` object for the fully client side use cases. - The exported `main` function now can be used to load user-specified shared libraries, and the user can use the returned `DyLD` instance to run their own exported Haskell functions. - The in-browser wasi implementation is switched to https://github.com/haskell-wasm/browser_wasi_shim for bugfixes and major performance improvements not landed upstream yet. - When being run by deno, it now correctly switches to non-nodejs code paths, so it's more convenient to test dyld logic with deno. See added comments for details, as well as the added `playground001` test case for an example of using it to build an in-browser Haskell playground. - - - - - 8f3e481f by Cheng Shao at 2025-11-01T00:08:01+01:00 testsuite: add playground001 to test haskell playground This commit adds the playground001 test case to test the haskell playground in browser, see comments for details. - - - - - af40606a by Cheng Shao at 2025-11-01T00:08:04+01:00 Revert "testsuite: add T26431 test case" This reverts commit 695036686f8c6d78611edf3ed627608d94def6b7. T26431 is now retired, wasm ghc internal-interpreter logic is tested by playground001. - - - - - 86c82745 by Vladislav Zavialov at 2025-11-01T07:24:29-04:00 Supplant TcRnExportHiddenComponents with TcRnDodgyExports (#26534) Remove a bogus special case in lookup_ie_kids_all, making TcRnExportHiddenComponents obsolete. - - - - - fcf6331e by Richard Eisenberg at 2025-11-03T08:33:05+00:00 Refactor fundep solving This commit is a large-scale refactor of the increasingly-messy code that handles functional dependencies. It has virtually no effect on what compiles but improves error messages a bit. And it does the groundwork for #23162. The big picture is described in Note [Overview of functional dependencies in type inference] in GHC.Tc.Solver.FunDeps * New module GHC.Tc.Solver.FunDeps contains all the fundep-handling code for the constraint solver. * Fundep-equalities are solved in a nested scope; they may generate unifications but otherwise have no other effect. See GHC.Tc.Solver.FunDeps.solveFunDeps The nested needs to start from the Givens in the inert set, but not the Wanteds; hence a new function `resetInertCans`, used in `nestFunDepsTcS`. * That in turn means that fundep equalities never show up in error messages, so the complicated FunDepOrigin tracking can all disappear. * We need to be careful about tracking unifications, so we kick out constraints from the inert set after doing unifications. Unification tracking has been majorly reformed: see Note [WhatUnifications] in GHC.Tc.Utils.Unify. A good consequence is that the hard-to-grok `resetUnificationFlag` has been replaced with a simpler use of `reportCoarseGrainUnifications` Smaller things: * Rename `FunDepEqn` to `FunDepEqns` since it contains multiple type equalities. Some compile time improvement Metrics: compile_time/bytes allocated Baseline Test value New value Change ---------------------- -------------------------------------- T5030(normal) 173,839,232 148,115,248 -14.8% GOOD hard_hole_fits(normal) 286,768,048 284,015,416 -1.0% geo. mean -0.2% minimum -14.8% maximum +0.3% Metric Decrease: T5030 - - - - - 231adc30 by Simon Peyton Jones at 2025-11-03T08:33:05+00:00 QuickLook's tcInstFun should make instantiation variables directly tcInstFun must make "instantiation variables", not regular unification variables, when instantiating function types. That was previously implemented by a hack: set the /ambient/ level to QLInstTyVar. But the hack finally bit me, when I was refactoring WhatUnifications. And it was always wrong: see the now-expunged (TCAPP2) note. This commit does it right, by making tcInstFun call its own instantiation functions. That entails a small bit of duplication, but the result is much, much cleaner. - - - - - 39d4a24b by Simon Peyton Jones at 2025-11-03T08:33:05+00:00 Build implication for constraints from (static e) This commit addresses #26466, by buiding an implication for the constraints arising from a (static e) form. The implication has a special ic_info field of StaticFormSkol, which tells the constraint solver to use an empty set of Givens. See (SF3) in Note [Grand plan for static forms] in GHC.Iface.Tidy.StaticPtrTable This commit also reinstates an `assert` in GHC.Tc.Solver.Equality. The test `StaticPtrTypeFamily` was failing with an assertion failure, but it now works. - - - - - 2e2aec1e by Simon Peyton Jones at 2025-11-03T08:33:05+00:00 Comments about defaulting representation equalities - - - - - 52a4d1da by Simon Peyton Jones at 2025-11-03T08:33:05+00:00 Improve tracking of rewriter-sets This refactor substantially improves the treatment of so-called "rewriter-sets" in the constraint solver. The story is described in the rewritten Note [Wanteds rewrite Wanteds: rewriter-sets] in GHC.Tc.Types.Constraint Some highlights * Trace the free coercion holes of a filled CoercionHole, in CoercionPlusHoles. See Note [Coercion holes] (COH5) This avoids taking having to take the free coercion variables of a coercion when zonking a rewrriter-set * Many knock on changes * Make fillCoercionHole take CoercionPlusHoles as its argument rather than to separate arguments. * Similarly setEqIfWanted, setWantedE, wrapUnifierAndEmit. * Be more careful about passing the correct CoHoleSet to `rewriteEqEvidence` and friends * Make kickOurAfterFillingCoercionHole more clever. See new Note [Kick out after filling a coercion hole] Smaller matters * Rename RewriterSet to CoHoleSet * Add special-case helper `rewriteEqEvidenceSwapOnly` - - - - - 3e78e1ba by Simon Peyton Jones at 2025-11-03T08:33:05+00:00 Tidy up constraint solving for foralls * In `can_eq_nc_forall` make sure to track Givens that are used in the nested solve step. * Tiny missing-swap bug-fix in `lookup_eq_in_qcis` * Fix some leftover mess from commit 14123ee646f2b9738a917b7cec30f9d3941c13de Author: Simon Peyton Jones Date: Wed Aug 20 00:35:48 2025 +0100 Solve forall-constraints via an implication, again Specifically, trySolveImplication is now dead. - - - - - 973f2c25 by Simon Peyton Jones at 2025-11-03T08:33:05+00:00 Do not treat CoercionHoles as free variables in coercions This fixes a long-standing wart in the free-variable finder; now CoercionHoles are no longer treated as a "free variable" of a coercion. I got big and unexpected performance regressions when making this change. Turned out that CallArity didn't discover that the free variable finder could be eta-expanded, which gave very poor code. So I re-used Note [The one-shot state monad trick] for Endo, resulting in GHC.Utils.EndoOS. Very simple, big win. - - - - - c2b8a0f9 by Simon Peyton Jones at 2025-11-03T08:33:05+00:00 Update debug-tracing in CallArity No effect on behaviour, and commented out anyway - - - - - 9aa5ee99 by Simon Peyton Jones at 2025-11-03T08:33:28+00:00 Comments only -- remove dangling Note references - - - - - 6683f183 by Simon Peyton Jones at 2025-11-03T08:33:28+00:00 Accept error message wibbles - - - - - 3ba3d9f9 by Luite Stegeman at 2025-11-04T00:59:41-05:00 rts: fix eager black holes: record mutated closure and fix assertion This fixes two problems with handling eager black holes, introduced by a1de535f762bc23d4cf23a5b1853591dda12cdc9. - the closure mutation must be recorded even for eager black holes, since the mutator has mutated it before calling threadPaused - The assertion that an unmarked eager black hole must be owned by the TSO calling threadPaused is incorrect, since multiple threads can race to claim the black hole. fixes #26495 - - - - - b5508f2c by Rodrigo Mesquita at 2025-11-04T14:10:56+00:00 build: Relax ghc/ghc-boot Cabal bound to 3.16 Fixes #26202 - - - - - c5b3541f by Rodrigo Mesquita at 2025-11-04T14:10:56+00:00 cabal-reinstall: Use haddock-api +in-tree-ghc Fixes #26202 - - - - - c6d4b945 by Rodrigo Mesquita at 2025-11-04T14:10:56+00:00 cabal-reinstall: Pass --strict to Happy This is necessary to make the generated Parser build successfully This mimics Hadrian, which always passes --strict to happy. Fixes #26202 - - - - - 79df1e0e by Rodrigo Mesquita at 2025-11-04T14:10:56+00:00 genprimopcode: Require higher happy version I've bumped the happy version to forbid deprecated Happy versions which don't successfully compile. - - - - - fa5d33de by Simon Peyton Jones at 2025-11-05T08:35:40-05:00 Add a HsWrapper optimiser This MR addresses #26349, by introduceing optSubTypeHsWrapper. There is a long Note [Deep subsumption and WpSubType] in GHC.Tc.Types.Evidence that explains what is going on. - - - - - ea58cae5 by Simon Peyton Jones at 2025-11-05T08:35:40-05:00 Improve mkWpFun_FRR This commit ensures that `mkWpFun_FRR` directly produces a `FunCo` in the cases where it can. (Previously called `mkWpFun` which in turn optimised to a `FunCo`, but that made the smarts in `mkWpFun` /essential/ rather than (as they should be) optional. - - - - - 5cdcfaed by Ben Gamari at 2025-11-06T09:01:36-05:00 compiler: Exclude units with no exposed modules from unused package check Such packages cannot be "used" in the Haskell sense of the word yet are nevertheless necessary as they may provide, e.g., C object code or link flags. Fixes #24120. - - - - - 74b8397a by Brandon Chinn at 2025-11-06T09:02:19-05:00 Replace deprecated argparse.FileType - - - - - 36ddf988 by Ben Gamari at 2025-11-06T09:03:01-05:00 Bump unix submodule to 2.8.8.0 Closes #26474. - - - - - c32b3a29 by fendor at 2025-11-06T09:03:43-05:00 Fix assertion in `postStringLen` to account for \0 byte We fix the assertion to handle trailing \0 bytes in `postStringLen`. Before this change, the assertion looked like this: ASSERT(eb->begin + eb->size > eb->pos + len + 1); Let's assume some values to see why this is actually off by one: eb->begin = 0 eb->size = 1 eb->pos = 0 len = 1 then the assertion would trigger correctly: 0 + 1 > 0 + 1 + 1 => 1 > 2 => false as there is not enough space for the \0 byte (which is the trailing +1). However, if we change `eb->size = 2`, then we do have enough space for a string of length 1, but the assertion still fails: 0 + 2 > 0 + 1 + 1 => 2 > 2 => false Which causes the assertion to fail if there is exactly enough space for the string with a trailing \0 byte. Clearly, the assertion should be `>=`! If we switch around the operand, it should become more obvious that `<=` is the correct comparison: ASSERT(eb->pos + len + 1 <= eb->begin + eb->size); This is expresses more naturally that the current position plus the length of the string (and the null byte) must be smaller or equal to the overall size of the buffer. This change also is in line with the implementation in `hasRoomForEvent` and `hasRoomForVariableEvent`: ``` StgBool hasRoomForEvent(EventsBuf *eb, EventTypeNum eNum) { uint32_t size = ...; if (eb->pos + size > eb->begin + eb->size) ... ``` the check `eb->pos + size > eb->begin + eb->size` is identical to `eb->pos + size <= eb->begin + eb->size` plus a negation. - - - - - 3034a6f2 by Ben Gamari at 2025-11-06T09:04:24-05:00 Bump os-string submodule to 2.0.8 - - - - - 39567e85 by Cheng Shao at 2025-11-06T09:05:06-05:00 rts: use computed goto for instruction dispatch in the bytecode interpreter This patch uses computed goto for instruction dispatch in the bytecode interpreter. Previously instruction dispatch is done by a classic switch loop, so executing the next instruction requires two jumps: one to the start of the switch loop and another to the case block based on the instruction tag. By using computed goto, we can build a jump table consisted of code addresses indexed by the instruction tags themselves, so executing the next instruction requires only one jump, to the destination directly fetched from the jump table. Closes #12953. - - - - - 93fc7265 by sheaf at 2025-11-06T21:33:24-05:00 Correct hasFixedRuntimeRep in matchExpectedFunTys This commit fixes a bug in the representation-polymormorphism check in GHC.Tc.Utils.Unify.matchExpectedFunTys. The problem was that we put the coercion resulting from hasFixedRuntimeRep in the wrong place, leading to the Core Lint error reported in #26528. The change is that we have to be careful when using 'mkWpFun': it expects **both** the expected and actual argument types to have a syntactically fixed RuntimeRep, as explained in Note [WpFun-FRR-INVARIANT] in GHC.Tc.Types.Evidence. On the way, this patch improves some of the commentary relating to other usages of 'mkWpFun' in the compiler, in particular in the view pattern case of 'tc_pat'. No functional changes, but some stylistic changes to make the code more readable, and make it easier to understand how we are upholding the WpFun-FRR-INVARIANT. Fixes #26528 - - - - - c052c724 by Simon Peyton Jones at 2025-11-06T21:34:06-05:00 Fix a horrible shadowing bug in implicit parameters Fixes #26451. The change is in GHC.Tc.Solver.Monad.updInertDicts where we now do /not/ delete /Wanted/ implicit-parameeter constraints. This bug has been in GHC since 9.8! But it's quite hard to provoke; I contructed a tests in T26451, but it was hard to do so. - - - - - b253013e by Georgios Karachalias at 2025-11-07T17:21:57-05:00 Remove the `CoreBindings` constructor from `LinkablePart` Adjust HscRecompStatus to disallow unhydrated WholeCoreBindings from being passed as input to getLinkDeps (which would previously panic in this case). Fixes #26497 - - - - - ac7b737e by Sylvain Henry at 2025-11-07T17:22:51-05:00 Testsuite: pass ext-interp test way (#26552) Note that some tests are still marked as broken with the ext-interp way (see #26552 and #14335) - - - - - 41a3ab9e by Joseph Fourment at 2025-11-08T23:37:41+00:00 Add type-lets into Core The plan for #20264 is to introduce let-bound types to have observable sharing in types. To avoid the need to carry an environment when dealing with occurrences of these type variables, we embed the types they're bound to (if any) in a `tv_unfolding :: Maybe Type` attribute. This way, one can look through let-bound type variables using `coreView` and friends. In particular, definitional equality looks through unfoldings. simple-opt: don't inline type-lets specialise: fix type-lets in DFun unfoldings During specialisation, a dictionary being specialised gets a new unfolding by turning `DFun \ bndrs -> MkD @<T1> ... @<Tm> <op1> ... <opn>` into `DFun \ spec_bndrs -> MkD @((\ bndrs -> TYPE: <T1>) spec_args) ... ((\ bndrs -> <opn>) spec_args)` which in turns gets beta-reduced into `DFun \ spec_bndrs -> MkD (let { bndrs = spec_args } in TYPE: <T1>) ... (let { bndrs = spec_args } in <opn>)`. Previously, such let binders would immediately be substituted into the type so it didn't cause any issue, but now we want to avoid inlining. Arguments of the form `let { bndrs = spec_args } in TYPE: <T1>` are not considered as type arguments since they're not of the canonical form `TYPE: something`. This commit restores the previous behavior of substituting the specialised type arguments. Alternatively, we could attach some floated type bindings to `DFun`s. occur-anal: implement occurence analysis for type variables In order to find out let-bound type variables that are used only once, in the hope of inlining them, we need to track type variables as well in the occurrence analiser. Just like Id's, we attach an `OccInfo` to each (immutable) type variable, and we walk into types and coercions to accurately gather occurrences. simplifier: don't inline type-lets Keep propagating type-lets further down the pipeline, in the simplifier. We also update CallArity, CprAnal, DmdAnal, WorkWrap, and Specialise to ignore type-lets. prep: make type-lets pass through CorePrep As a first attempt, ignore type-lets in CorePrep to avoid crashes. However, this is not enough: CorePrep also does some let-floating. If we don't float type-lets along with value-level let-bindings, the latter can float out of the scope of a type variable in use. simple-opt: fix simple_type_bind Also: - Inline small types using a new typeIsSmallEnoughToInline predicate - Inline single-occurrence variables simple-opt: make beta-reduction use simple_bind_type iface: add IfaceTypeLetBndr to represent non-top-level type-let binders IfaceLetBndr isn't fit to represent type-let binders, as it includes a bunch of vacuous flags for Ids only. Instead of putting squares in circles, I added a new constructor for type binders. The downside is that it breaks existing iface files, so since we can't bootstrap yet so we have to bootstrap a cherry-picked branch and then checkout again to build with --freeze1. To avoid similar issues in the future, IfaceTyVarInfoItem serialises with a tag despite there being only one constructor for now. dmd-anal: prefix unused variable with _ to avoid warning type: inline unfoldView in sORTKind_maybe tidy: deal with type-lets notes: add Note [Type and coercion lets] notes: update Note [Comparing nullary type synonyms] to account for type variables While updating backlinks, I noticed the optimisation for type variables could be performed in more places. simplifier: inline single-occurring type-lets cleanup: remove NOINLINE on tyVarOccInfo Wibbles Wibbles Progress Progress More progress Progress ...doesn't compile though Mostly working now Aggressively create type-lets more progress More progress Temp debug printing Remove bogus assert Fix anoher couple of bugs in SimpleOpt and exprIsTrivial Improve zonking of foreign decls to avoid TcTyVars escaping Wibbles Some small wibbles Improvements Rmmove trace Wibbles Use lambda, not let, in WorkWrap Using type let did not work right with type lets and shadowing Requires Lint to be OK join points under beta redexes -- but it is! Needs better documentation Wibbles More improvements More improvements * Less cloning in SpecConstr * Lint checks RULES for imported binders Comments only Wibble Wibbles Wibbles .. getting Lint errors when compiling GHC.Internal.Classes Wibbles More improvements ..now getting to the back end an interface file generation Wibbles Wibble unsed var Missing case in tyThingEntityInfo Add IfaceExtTyVar Wibbles Start to make OccAnal count TyCoVars properly [skip ci] Proper occurrence analysis for TyCoVars Wibble imports Wibble imports again Fix two tricky buglets More small fixes Add missing mkAbsCoreApps ...which caused bad Lint errors More wibbles More wibbles exp around mkPolyAbsLams - - - - - fad299fe by Simon Peyton Jones at 2025-11-08T23:37:49+00:00 Make it compile again - - - - - 5dfd940d by Simon Peyton Jones at 2025-11-08T23:37:49+00:00 Simplify mkcoreAbsLams a bit ..Needs documentation - - - - - 4c003c7b by Simon Peyton Jones at 2025-11-10T00:32:48+00:00 Fix build Several important fixes, need better docs - 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