[Git][ghc/ghc][wip/fendor/dep-json] 4 commits: Add `-dep-json` flag to `ghc -M`
by Hannes Siebenhandl (＠fendor) 03 Nov '26
by Hannes Siebenhandl (＠fendor) 03 Nov '26
03 Nov '26
Hannes Siebenhandl pushed to branch wip/fendor/dep-json at Glasgow Haskell Compiler / GHC
Commits:
e3200014 by fendor at 2026-11-03T15:16:08+01:00
Add `-dep-json` flag to `ghc -M`
Add an optional flag to `ghc -M` that allows to write the dependency
information in JSON Lines format.
The JSON Lines format enables us to stream the output of the dependency
generation to a consumer.
The output of `-dep-json` is streamed to a temporary file and then
copied to the final destination to avoid partial writes.
Each line contains one of two possible json objects:
1. A Home Unit Dependency
* Contains the name of the home module, its unit, where it is
located, whether a preprocessor is used, and all of its imports.
Importantly, the imports include `-XExplicitLevelImports`
information.
* If requested via `-include-pkg-deps`, includes imports of external
units, e.g. modules from `base`.
* If requested via `-include-cpp-deps`, files included via CPP.
2. External Unit Dependency
* Only if `-include-pkg-deps` is given
* Contains unit-id, its package name and package id.
- - - - -
f3f711e0 by fendor at 2026-11-03T15:16:08+01:00
Add multiple home unit support to `ghc -M`
Allows to process the module graph of multiple home units at once using
the same syntax as `--make` and `--interactive`:
ghc -M -unit @unitA -unit @unitB
The semantics are identical to `--make` and `--interactive`.
Each home unit can declare individually to use `-include-cpp-deps` and
`-include-pkg-deps`.
However, there can only be one output file, and `-dep-json` and
`-dep-makefile` can only be provided at the top of the cli invocation.
We introduce a new GHC API `doMkDepend` that allows to use multiple home
units conveniently.
The output of `-dep-json` and `-dep-makefile` does not change, since we
were careful to choose a format that supports multiple home units from
the start.
Single home units are still accepted like before with no changes.
- - - - -
a90b7a0d by fendor at 2026-11-03T15:16:08+01:00
Deprecate `doMkDependHS` in favour of `doMkDepend`
- - - - -
c310049a by fendor at 2026-11-03T15:16:08+01:00
Improve `ghc -M` test-suite
Adds a more extensive test-suite for `ghc -M` mode.
Introduce a dedicated test mode for running `ghc -M` tests more
conveniently.
Adds lots of normalizers that help to write `ghc -M` tests in a platform
independent manner.
Adds utility scripts that help format the output of `ghc -M`.
Add new perf regression tests for json and makefile generation.
Add perf regression test for multiple home unit support.
- - - - -
64 changed files:
- + changelog.d/make-depends-deprecate-doMkDependHS
- + changelog.d/make-depends-json
- + changelog.d/make-depends-multiple-home-units
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/MakeFile.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Driver/Session/Units.hs
- compiler/GHC/Utils/Json.hs
- + docs/users_guide/make-depends-json-schema-1_0.json
- docs/users_guide/separate_compilation.rst
- ghc/Main.hs
- testsuite/driver/testglobals.py
- testsuite/driver/testlib.py
- testsuite/tests/driver/mkdepend/Makefile
- + testsuite/tests/driver/mkdepend/README.md
- testsuite/tests/driver/mkdepend/A.hs → testsuite/tests/driver/mkdepend/T24384/A.hs
- testsuite/tests/driver/mkdepend/C.hs → testsuite/tests/driver/mkdepend/T24384/C.hs
- testsuite/tests/driver/mkdepend/C.hs-boot → testsuite/tests/driver/mkdepend/T24384/C.hs-boot
- testsuite/tests/driver/mkdepend/D.hs → testsuite/tests/driver/mkdepend/T24384/D.hs
- testsuite/tests/driver/mkdepend/E.hs → testsuite/tests/driver/mkdepend/T24384/E.hs
- testsuite/tests/driver/mkdepend/dep-internal/DepInternal.hs → testsuite/tests/driver/mkdepend/T24384/dep-internal/DepInternal.hs
- testsuite/tests/driver/mkdepend/dep-internal/dep-internal.pkg → testsuite/tests/driver/mkdepend/T24384/dep-internal/dep-internal.pkg
- testsuite/tests/driver/mkdepend/dep-public/DepPublic.hs → testsuite/tests/driver/mkdepend/T24384/dep-public/DepPublic.hs
- testsuite/tests/driver/mkdepend/dep-public/dep-public.pkg → testsuite/tests/driver/mkdepend/T24384/dep-public/dep-public.pkg
- testsuite/tests/driver/mkdepend/dep/Dep.hs → testsuite/tests/driver/mkdepend/T24384/dep/Dep.hs
- testsuite/tests/driver/mkdepend/dep/dep.pkg → testsuite/tests/driver/mkdepend/T24384/dep/dep.pkg
- testsuite/tests/driver/mkdepend/foo.h → testsuite/tests/driver/mkdepend/T24384/foo.h
- testsuite/tests/driver/mkdepend/lib/B.hs → testsuite/tests/driver/mkdepend/T24384/lib/B.hs
- + testsuite/tests/driver/mkdepend/T24384/lib/B.hs-boot
- testsuite/tests/driver/mkdepend/preproc.sh → testsuite/tests/driver/mkdepend/T24384/preproc.sh
- testsuite/tests/driver/mkdepend/T24384a.stdout
- + testsuite/tests/driver/mkdepend/T24384b.stdout
- + testsuite/tests/driver/mkdepend/T24384c.stdout
- testsuite/tests/driver/mkdepend/all.T
- + testsuite/tests/driver/mkdepend/format_json.sh
- + testsuite/tests/driver/mkdepend/format_makefile.sh
- + testsuite/tests/driver/mkdepend/mhu01/a/A/Base.hs
- + testsuite/tests/driver/mkdepend/mhu01/a/A/Base.hs-boot
- + testsuite/tests/driver/mkdepend/mhu01/a/A/TH.hs
- + testsuite/tests/driver/mkdepend/mhu01/a/Util.hs
- + testsuite/tests/driver/mkdepend/mhu01/b/B/Normal.hs
- + testsuite/tests/driver/mkdepend/mhu01/b/B/Splice.hs
- + testsuite/tests/driver/mkdepend/mhu01/b/Util.hs
- + testsuite/tests/driver/mkdepend/mhu01/c/C.hs
- + testsuite/tests/driver/mkdepend/mhu01/unitA
- + testsuite/tests/driver/mkdepend/mhu01/unitB
- + testsuite/tests/driver/mkdepend/mhu01/unitC
- + testsuite/tests/driver/mkdepend/mhu02/A.hs
- + testsuite/tests/driver/mkdepend/mhu02/B.hs
- + testsuite/tests/driver/mkdepend/mhu02/pp.sh
- + testsuite/tests/driver/mkdepend/mhu02/unitA
- + testsuite/tests/driver/mkdepend/mhu02/unitB
- + testsuite/tests/driver/mkdepend/mhu03/pkg/A.hs
- + testsuite/tests/driver/mkdepend/mhu03/pkg/pp.sh
- + testsuite/tests/driver/mkdepend/mhu03/unitA
- + testsuite/tests/driver/mkdepend/mkdepend01.dep-json
- + testsuite/tests/driver/mkdepend/mkdepend01.dep-makefile
- + testsuite/tests/driver/mkdepend/mkdepend01/A.hs
- + testsuite/tests/driver/mkdepend/mkdepend_mhu01.dep-json
- + testsuite/tests/driver/mkdepend/mkdepend_mhu01.dep-makefile
- + testsuite/tests/driver/mkdepend/mkdepend_mhu02.dep-json
- + testsuite/tests/driver/mkdepend/mkdepend_mhu03.dep-json
- testsuite/tests/perf/compiler/large-project/all.T
- + testsuite/tests/perf/compiler/large-project/large-project-mhu.sh
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[Git][ghc/ghc][wip/romes/per-thread-break-on-exception] Per-thread break-on exception (TSO_STOP_ON_EXCEPTION)
by Rodrigo Mesquita (＠alt-romes) 03 Nov '26
by Rodrigo Mesquita (＠alt-romes) 03 Nov '26
03 Nov '26
Rodrigo Mesquita pushed to branch wip/romes/per-thread-break-on-exception at Glasgow Haskell Compiler / GHC
Commits:
2103dc2f by Rodrigo Mesquita at 2026-11-03T13:58:37+00:00
Per-thread break-on exception (TSO_STOP_ON_EXCEPTION)
The `-fbreak-on-exception` flag allows the interactive interpreter to stop
when a synchronous exception is raised.
However, this is a global toggle backed by a global variable in the RTS
(rts_stop_on_exception) which is not compatible with a multi-threaded
debugger where we may want to stop if some threads raise a synchronous
exception but not other.
This commit makes -break-on-exception similar to step-next and step-out
where there is a per-thread toggle on each TSO (TSO_STOP_ON_EXCEPTION),
and that break-on-exception set in EvalOpts when resuming a statement
only affect the thread being resumed.
Fixes #28068
- - - - -
12 changed files:
- libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingDisabled.hsc
- libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingEnabled.hsc
- libraries/ghc-heap/tests/parse_tso_flags.hs
- libraries/ghc-internal/src/GHC/Internal/Heap/Closures.hs
- libraries/ghci/GHCi/Debugger.hs
- libraries/ghci/GHCi/Run.hs
- rts/Exception.cmm
- rts/Interpreter.c
- rts/Interpreter.h
- rts/RtsSymbols.c
- rts/include/rts/Constants.h
- rts/include/stg/MiscClosures.h
Changes:
=====================================
libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingDisabled.hsc
=====================================
@@ -93,6 +93,7 @@ parseTsoFlags w | isSet (#const TSO_LOCKED) w = TsoLocked : parseTsoFlags (unset
#if __GLASGOW_HASKELL__ >= 913
| isSet (#const TSO_STOP_NEXT_BREAKPOINT) w = TsoStopNextBreakpoint : parseTsoFlags (unset (#const TSO_STOP_NEXT_BREAKPOINT) w)
| isSet (#const TSO_STOP_AFTER_RETURN) w = TsoStopAfterReturn : parseTsoFlags (unset (#const TSO_STOP_AFTER_RETURN) w)
+ | isSet (#const TSO_STOP_ON_EXCEPTION) w = TsoStopOnException : parseTsoFlags (unset (#const TSO_STOP_ON_EXCEPTION) w)
#endif
parseTsoFlags 0 = []
parseTsoFlags w = [TsoFlagsUnknownValue w]
=====================================
libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingEnabled.hsc
=====================================
@@ -93,6 +93,7 @@ parseTsoFlags w | isSet (#const TSO_LOCKED) w = TsoLocked : parseTsoFlags (unset
#if __GLASGOW_HASKELL__ >= 913
| isSet (#const TSO_STOP_NEXT_BREAKPOINT) w = TsoStopNextBreakpoint : parseTsoFlags (unset (#const TSO_STOP_NEXT_BREAKPOINT) w)
| isSet (#const TSO_STOP_AFTER_RETURN) w = TsoStopAfterReturn : parseTsoFlags (unset (#const TSO_STOP_AFTER_RETURN) w)
+ | isSet (#const TSO_STOP_ON_EXCEPTION) w = TsoStopOnException : parseTsoFlags (unset (#const TSO_STOP_ON_EXCEPTION) w)
#endif
parseTsoFlags 0 = []
parseTsoFlags w = [TsoFlagsUnknownValue w]
=====================================
libraries/ghc-heap/tests/parse_tso_flags.hs
=====================================
@@ -15,5 +15,6 @@ main = do
assertEqual (parseTsoFlags 256) [TsoAllocLimit]
assertEqual (parseTsoFlags 512) [TsoStopNextBreakpoint]
assertEqual (parseTsoFlags 1024) [TsoStopAfterReturn]
+ assertEqual (parseTsoFlags 2048) [TsoStopOnException]
assertEqual (parseTsoFlags 6) [TsoLocked, TsoBlockx]
=====================================
libraries/ghc-internal/src/GHC/Internal/Heap/Closures.hs
=====================================
@@ -632,6 +632,7 @@ data TsoFlags
| TsoAllocLimit
| TsoStopNextBreakpoint
| TsoStopAfterReturn
+ | TsoStopOnException
| TsoFlagsUnknownValue Word32 -- ^ Please report this as a bug
deriving (Eq, Show, Generic, Ord)
=====================================
libraries/ghci/GHCi/Debugger.hs
=====================================
@@ -13,7 +13,10 @@ module GHCi.Debugger
, rts_disableStopAfterReturn
-- * Stop on exception
- , exceptionFlag
+ , rts_enableStopOnException
+ , rts_disableStopOnException
+ , rts_enableStopOnExceptionAll
+ , rts_disableStopOnExceptionAll
-- * Breakpoint Callback
, BreakpointCallback
@@ -23,7 +26,6 @@ module GHCi.Debugger
import Prelude -- See note [Why do we import Prelude here?]
import GHC.Base (ThreadId#, Addr#, Int#)
-import Foreign.C (CInt)
import Foreign (StablePtr, Ptr)
import GHCi.RemoteTypes (HValue)
@@ -60,7 +62,19 @@ foreign import ccall unsafe "rts_disableStopAfterReturn"
--------------------------------------------------------------------------------
-foreign import ccall "&rts_stop_on_exception" exceptionFlag :: Ptr CInt
+-- | Make this thread break when an exception is hit
+foreign import ccall unsafe "rts_enableStopOnException" rts_enableStopOnException :: ThreadId# -> IO ()
+
+-- | No longer have this thread break when an exception is hit
+foreign import ccall unsafe "rts_disableStopOnException" rts_disableStopOnException :: ThreadId# -> IO ()
+
+-- | Enables global break-on-exception for all threads
+foreign import ccall unsafe "rts_enableStopOnExceptionAll" rts_enableStopOnExceptionAll :: IO ()
+
+-- | Disables the global break-on-exception for all threads. Individual threads
+-- with break-on-exception will still break on exception if the global flag is
+-- disabled.
+foreign import ccall unsafe "rts_disableStopOnExceptionAll" rts_disableStopOnExceptionAll :: IO ()
--------------------------------------------------------------------------------
=====================================
libraries/ghci/GHCi/Run.hs
=====================================
@@ -269,14 +269,17 @@ rethrow EvalOpts{..} io =
catchNoPropagate io $ \(ExceptionWithContext cx se) -> do
-- If -fbreak-on-error, we break unconditionally,
-- but with care of not breaking twice
+ ThreadId mytid <- myThreadId
if breakOnError && not breakOnException
- then poke exceptionFlag 1
+ then rts_enableStopOnException mytid
else case fromException se of
-- If it is a "UserInterrupt" exception, we allow
-- a possible break by way of -fbreak-on-exception
Just UserInterrupt -> return ()
-- In any other case, we don't want to break
- _ -> poke exceptionFlag 0
+ _ -> do
+ rts_disableStopOnException mytid
+ rts_disableStopOnExceptionAll
rethrowIO (ExceptionWithContext cx se)
--
@@ -338,7 +341,11 @@ withBreakAction opts breakMVar statusMVar mtid act
setBreakAction = do
stablePtr <- newStablePtr onBreak
poke breakPointIOAction stablePtr
- when (breakOnException opts) $ poke exceptionFlag 1
+ when (breakOnException opts) $ do
+ case mtid of
+ Nothing -> rts_enableStopOnExceptionAll
+ Just (ThreadId tid) -> do
+ rts_enableStopOnException tid
when (singleStep opts) rts_enableStopNextBreakpointAll
when (stepOut opts) $ do
case mtid of
@@ -380,7 +387,9 @@ withBreakAction opts breakMVar statusMVar mtid act
resetBreakAction stablePtr = do
poke breakPointIOAction noBreakStablePtr
- poke exceptionFlag 0
+ case mtid of
+ Just (ThreadId tid) -> rts_disableStopOnException tid
+ _ -> rts_disableStopOnExceptionAll
rts_disableStopNextBreakpointAll
case mtid of
Just (ThreadId tid) -> rts_disableStopAfterReturn tid
=====================================
rts/Exception.cmm
=====================================
@@ -523,14 +523,16 @@ retry_pop_stack:
if (W_[no_break_on_exception] != 0) {
W_[no_break_on_exception] = 0;
} else {
- if (TO_W_(CInt[rts_stop_on_exception]) != 0) {
+ if (TO_W_(CInt[rts_stop_on_exception]) != 0 ||
+ (TO_W_(StgTSO_flags(CurrentTSO)) & TSO_STOP_ON_EXCEPTION) != 0) {
W_ ioAction;
// we don't want any further exceptions to be caught,
// until GHCi is ready to handle them. This prevents
// deadlock if an exception is raised in InteractiveUI,
- // for example. Perhaps the stop_on_exception flag should
- // be per-thread.
+ // for example.
CInt[rts_stop_on_exception] = 0;
+ StgTSO_flags(CurrentTSO) = %lobits32(
+ TO_W_(StgTSO_flags(CurrentTSO)) & ~TSO_STOP_ON_EXCEPTION);
("ptr" ioAction) = ccall deRefStablePtr (W_[rts_breakpoint_io_action] "ptr");
Sp = Sp - WDS(11);
Sp(10) = exception;
=====================================
rts/Interpreter.c
=====================================
@@ -388,8 +388,6 @@ is_ret_bco_frame(const StgPtr frame_head) {
);
}
-int rts_stop_on_exception = 0;
-
/* ---------------------------------------------------------------------------
* Enabling and disabling global single step mode
* ------------------------------------------------------------------------ */
@@ -398,7 +396,7 @@ int rts_stop_on_exception = 0;
* Unlike `TSO_STOP_NEXT_BREAKPOINT`, which sets single-step mode per-thread,
* `rts_stop_next_breakpoint` globally enables single-step mode. If enabled, we
* will stop at the immediate next breakpoint regardless of what thread it is in. */
-int rts_stop_next_breakpoint = 0;
+static int rts_stop_next_breakpoint = 0;
void rts_enableStopNextBreakpointAll(void)
{
@@ -473,7 +471,50 @@ A limitation of this approach is that stepping-out of a function that was
tail-called will skip its caller since no stack frame is pushed for a tail
call (i.e. a tail call returns directly to its caller's first non-tail caller).
*/
-/* -------------------------------------------------------------------------- */
+
+/* ---------------------------------------------------------------------------
+ * Enabling and disabling global break-on-exception
+ * ------------------------------------------------------------------------ */
+
+/* A global toggle for break-on-exception
+
+ Unlike `TSO_STOP_ON_EXCEPTION`, which breaks when an exception is raised in
+ this thread, the global toggle makes an exception raised in any thread yield
+ a breakpoint in that thread.
+
+ Currently, this is necessary if we ever want to break on an exception raised
+ in thread forked by the main debuggee thead: we can only toggle TSO_STOP_ON_EXCEPTION
+ on threads we control, and those forked by the debuggee we don't.
+ */
+int rts_stop_on_exception = 0;
+
+void rts_enableStopOnExceptionAll(void)
+{
+ rts_stop_on_exception = 1;
+}
+
+void rts_disableStopOnExceptionAll(void)
+{
+ rts_stop_on_exception = 0;
+}
+
+/* ---------------------------------------------------------------------------
+ * Enabling and disabling per-thread break-on-exception
+ * ------------------------------------------------------------------------ */
+
+void rts_enableStopOnException(StgTSO* tso)
+{
+ Capability* cap = rts_unsafeGetMyCapability();
+ setThreadFlag(cap, tso, TSO_STOP_ON_EXCEPTION);
+}
+
+void rts_disableStopOnException(StgTSO* tso)
+{
+ Capability* cap = rts_unsafeGetMyCapability();
+ unsetThreadFlag(cap, tso, TSO_STOP_ON_EXCEPTION);
+}
+
+/* ------------------------------------------------------------------------ */
#if defined(INTERP_STATS)
=====================================
rts/Interpreter.h
=====================================
@@ -12,6 +12,11 @@ RTS_PRIVATE Capability *interpretBCO (Capability* cap);
void interp_startup ( void );
void interp_shutdown ( void );
+// The following debugger functions are exported from here, but not from the
+// RTS public api (RtsApi.h). They are used by the `ghci` library to implement
+// debugger commands on the interpreter like step-next, step-out, and
+// break-on-exception.
+
// Debugger single step
void rts_enableStopNextBreakpointAll ( void );
void rts_disableStopNextBreakpointAll ( void );
@@ -21,3 +26,9 @@ void rts_disableStopNextBreakpoint ( StgTSO* );
// Debugger step out
void rts_enableStopAfterReturn ( StgTSO* );
void rts_disableStopAfterReturn ( StgTSO* );
+
+// Debugger stop on exception
+void rts_enableStopOnException ( StgTSO* );
+void rts_disableStopOnException ( StgTSO* );
+void rts_enableStopOnExceptionAll ( void );
+void rts_disableStopOnExceptionAll ( void );
=====================================
rts/RtsSymbols.c
=====================================
@@ -942,14 +942,16 @@ extern char **environ;
SymI_HasProto(revertCAFs) \
SymI_HasDataProto(RtsFlags) \
SymI_NeedsDataProto(rts_breakpoint_io_action) \
- SymI_NeedsDataProto(rts_stop_next_breakpoint) \
- SymI_NeedsDataProto(rts_stop_on_exception) \
SymI_NeedsProto(rts_enableStopNextBreakpointAll) \
SymI_NeedsProto(rts_disableStopNextBreakpointAll) \
SymI_NeedsProto(rts_enableStopNextBreakpoint) \
SymI_NeedsProto(rts_disableStopNextBreakpoint) \
SymI_NeedsProto(rts_enableStopAfterReturn) \
SymI_NeedsProto(rts_disableStopAfterReturn) \
+ SymI_NeedsProto(rts_enableStopOnException) \
+ SymI_NeedsProto(rts_disableStopOnException) \
+ SymI_NeedsProto(rts_enableStopOnExceptionAll) \
+ SymI_NeedsProto(rts_disableStopOnExceptionAll) \
SymI_HasProto(stopTimer) \
SymI_HasDataProto(n_capabilities) \
SymI_HasDataProto(max_n_capabilities) \
=====================================
rts/include/rts/Constants.h
=====================================
@@ -394,6 +394,11 @@
*/
#define TSO_STOP_AFTER_RETURN 1024
+/*
+ * Enables break-on-exception mode for this thread
+ */
+#define TSO_STOP_ON_EXCEPTION 2048
+
/*
* The number of times we spin in a spin lock before yielding (see
* #3758). To tune this value, use the benchmark in #3758: run the
=====================================
rts/include/stg/MiscClosures.h
=====================================
@@ -583,7 +583,6 @@ RTS_FUN_DECL(stg_annotateStackzh);
#if IN_STG_CODE && !IN_STGCRUN
// Interpreter.c
-extern StgWord rts_stop_next_breakpoint[];
extern StgWord rts_stop_on_exception[];
extern StgWord rts_breakpoint_io_action[];
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Simon Peyton Jones pushed to branch wip/case-bndr-unf at Glasgow Haskell Compiler / GHC
Commits:
f445f5b5 by Simon Peyton Jones at 2026-11-03T14:12:43+00:00
Wibble
- - - - -
1 changed file:
- compiler/GHC/Core/Opt/Simplify/Iteration.hs
Changes:
=====================================
compiler/GHC/Core/Opt/Simplify/Iteration.hs
=====================================
@@ -51,6 +51,7 @@ import GHC.Types.Literal ( litIsLifted ) --, mkLitInt ) -- temporarily comment
import GHC.Types.SourceText
import GHC.Types.Id
import GHC.Types.Id.Info
+import GHC.Types.Cpr( isTopCprSig )
import GHC.Types.InlinePragma
import GHC.Types.Name ( mkSystemVarName, isExternalName, getOccFS )
import GHC.Types.Demand
@@ -4022,9 +4023,9 @@ mkDupableContWithDmds env _
-- A lambda binder may have only occurrence and demand info;
-- see (SB3) in Note [StrictBind]
- ; let info = idInof bndr
+ ; let info = idInfo bndr
zapped_info = vanillaIdInfo `setOccInfo` occInfo info
- `setDemandInfo` dmd_info
+ `setDemandInfo` (demandInfo info)
zapped_bndr = bndr `setIdInfo` zapped_info
; (sb_env1, bndr') <- simplBinder sb_env zapped_bndr
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[Git][ghc/ghc][wip/andreask/cfg-fix] x86 ncg: Track the current block in NatM to keep the CFG in sync
by Sylvain Henry (＠hsyl20) 03 Nov '26
by Sylvain Henry (＠hsyl20) 03 Nov '26
03 Nov '26
Sylvain Henry pushed to branch wip/andreask/cfg-fix at Glasgow Haskell Compiler / GHC
Commits:
57907f35 by Andreas Klebinger at 2026-11-03T14:58:40+01:00
x86 ncg: Track the current block in NatM to keep the CFG in sync
The x86 NCG maintains a CFG that is used for code layout. Whenever
instruction selection introduces new basic blocks (for instance for
word-to-float conversions, cmpxchg based atomic operations, ctz on
i386 or 64-bit shifts on i386) it must update this CFG, and the code
that follows must use the new block as its origin.
Before this patch the current block was threaded explicitly through
some statement-level functions only. Block-introducing primops that
were dispatched as "simple" (word2Float#, #27915) and the 64-bit shifts
in iselExpr64 did not update the CFG at all. This resulted in an
out-of-sync CFG, bad code layout and the "Can't find weight for edge
that should have one" panic once the register allocator inserted
fixup blocks (#27694, #27915).
We now keep the current block in the NatM state and provide a few
combinators (continueInNewBlock, addCondBlock, addDiamondFlow,
addColdSelfLoop, increaseEdgeWeight) that update the CFG and the
current block at the same time. See Note [Updating the CFG during
CodeGen] in GHC.CmmToAsm.Monad.
The cfg sanity check (-dasm-lint) now also checks that the branches in
the generated code and the edges in the CFG match both ways (call edges
excepted), which catches this class of bug early. It immediately found
another desync: when the register allocator needs more stack than
preallocated, allocMoreStack moves the body of every entry block into a
new block and retargets the local jumps to it, but the CFG only recorded
the new block as the immediate successor of the entry block. The new
addPreentryBlock also redirects the jump edges (and keeps the call
edges, since returns still go through the entry block).
The x86 code generator now keeps the CFG in sync on i386 too, so
backendMaintainsCfg is enabled for it: i386 gets CFG based code layout,
dead code elimination and the -dasm-lint check.
Fixes #27694, #27915
Co-authored-by: Sylvain Henry <sylvain(a)haskus.fr>
Co-Authored-By: Claude Fable 5.1 <noreply(a)anthropic.com>
- - - - -
14 changed files:
- + changelog.d/27694
- compiler/GHC/CmmToAsm.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/BlockLayout.hs
- compiler/GHC/CmmToAsm/CFG.hs
- compiler/GHC/CmmToAsm/Monad.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToAsm/X86/Instr.hs
- + testsuite/tests/codeGen/should_compile/T27694.hs
- testsuite/tests/codeGen/should_compile/all.T
- + testsuite/tests/codeGen/should_run/T27915.hs
- + testsuite/tests/codeGen/should_run/T27915.stdout-ws-32
- + testsuite/tests/codeGen/should_run/T27915.stdout-ws-64
- testsuite/tests/codeGen/should_run/all.T
The diff was not included because it is too large.
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/57907f350bb29ecf3987845cd305c39…
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[Git][ghc/ghc][wip/fendor/dep-json-link-nodes] 77 commits: Remove the Eq and Ord instances for ForAllTyFlag
by Hannes Siebenhandl (＠fendor) 03 Nov '26
by Hannes Siebenhandl (＠fendor) 03 Nov '26
03 Nov '26
Hannes Siebenhandl pushed to branch wip/fendor/dep-json-link-nodes at Glasgow Haskell Compiler / GHC
Commits:
d07a5176 by Simon Peyton Jones at 2026-10-13T18:10:39-04:00
Remove the Eq and Ord instances for ForAllTyFlag
In Note [Comparing visibility] in GHC.Core.TyCo.Compare we read that
"we always compare ForAllTyFlags with `eqForAllVis` or `cmpForAllVis`"
But alas there was an Eq and Ord instance for ForAllTyFlag, which made it
impossible to check this claim. So I made these changes:
* Move the definition of ForAllTyFlag and its related functions from
L.H.S.Specificity (where it did not belong, since L.H.S didn't use it)
into GHC.Types.Var.
* Remove the Eq and Ord instances for ForAllTyFlag
* Deal with the fallout, by using `eqForAllVis` or related functions.
* In interface files we use IfaceType as a key for a de-deduplication map
See Note [Deduplication during iface binary serialisation]
in GHC.Iface.Binary. For this we need /exact/ comparison, so we use a
newtype wrapper for IfaceForAllTyFlag, and give use `cmpForAllTyFlagExactly`
to implement its Ord instance. Tiresome but easy.
* Rename `toIfaceForAllBndrs` to `toIfaceForAllTyBndrs`
- - - - -
ea5c054d by Simon Peyton Jones at 2026-10-13T18:10:39-04:00
Refactor type and coercion substitution
This MR refactors type and coercion substitution so that they use
TyCoMapper, rather than hand-rolled code. Fundamentally it's a simple
idea, but I had to do quite a bit of refactoring to make it fly.
I got Claude to help me this this refactoring, but I paid careful
attention to every line of code.
Main changes:
* New module GHC.Core.TyCo.Make which defines TyCoMapper, and a bunch of other
simple "smart constructors" for types and coercions. See
GHC.Core.TyCo.Rep Note [The Type-related module hierarchy], esp (TRM1)
* The new TyCoMapper has new fields `tcm_tcapp_ty` and `tcm_tcapp_co` to handle
type-constructor applications. These replace `tcm_tycon`.
* Rewrite GHC.Core.TyCo.Subst to use TyCoMapper
* Rewrite GHC.Core.Type.expandTypeSynonyms to use TyCoMapper.
* Implement `seqType` and `seqCo` with TyCoFolder. To to this I had to add
a `tcf_lit` field to TyCoFolder.
* A new module GHC.Utils.StrictIdentity to define a strict identity monad,
which itself is used for
substTyCoMapper :: TyCoMapper Subst StrictIdentity
* I removed an apparently-unused instance for Binary Levity
Refactoring `seq` functions
* In GHC.Core.Seq, redefine `seqOneShot`, `seqRuleInfo`, and friends to return
`SeqResult`, a new type defined in GHC.Types.Baseic, rather than `()`. We
can define a Monoid instance for `SeqResult` that does the right thing.
* This has knock-on effects across the compiler.
- - - - -
34165e23 by Simon Peyton Jones at 2026-10-13T18:10:39-04:00
Refactor TyCoMapper to take a single monad; add StrictReaderT
TyCoMapper used to be parameterised over both an environment and a
monad, with fields like
tcm_tyvar :: env -> TyVar -> m Type
Now it is parameterised over just the monad:
tcm_tyvar :: TyVar -> m Type
If the mapping needs an environment, `m` is a reader monad over that
environment. Many uses (e.g. zonkTcTypeMapper, swizzleMapper) need no
environment at all, and used to pass a dummy (). The binder field
becomes
tcm_tycobinder :: forall r. TyCoVar -> ForAllTyFlag
-> (TyCoVar -> m r) -> m r
and runs the continuation in the extended environment. mapTyCoX is gone;
only mapTyCo remains.
To make this efficient, the reader monad must use the one-shot trick and
be strict in the environment. So:
* New module GHC.Utils.Monad.StrictReader defines
newtype StrictReaderT r m a
with hand-written instances. The builder of the pattern synonym
`StrictReaderT` is a smart constructor that adds both `oneShot` and a
bang on the environment, so every StrictReaderT computation is strict
in the environment. See Note [Instances for StrictReaderT].
* ZonkT becomes type ZonkT = StrictReaderT ZonkEnv
ZonkM becomes type ZonkM = StrictReaderT ZonkGblEnv IO
replacing their own hand-written instances.
* Substitution uses
type SubstM = StrictReaderT Subst StrictIdentity
substTyCoMapper :: TyCoMapper SubstM
and similarly expandTypeSynonymMapper.
* zonk_tycomapper :: TyCoMapper (ZonkT TcM) is now much simpler.
* swizzleMapper uses StrictIdentity rather than Identity.
* Module renaming, so that the strict monads are all peers in GHC.Utils.Monad:
GHC.Utils.StrictIdentity ==> GHC.Utils.Monad.StrictIdentity
GHC.Utils.Monad.State.Strict ==> GHC.Utils.Monad.StrictState
alongside the new GHC.Utils.Monad.StrictReader.
Co-Authored-By: Claude Opus 5.5 <noreply(a)anthropic.com>
- - - - -
c0299e15 by Simon Jakobi at 2026-10-13T18:11:23-04:00
testsuite: Line-buffer the driver's stdout
Python block-buffers stdout when it is a pipe. This is the case for
example in CI. As a result there is often no indication of progress at
all until the run ends.
To fix this, we configure it explicitly to use line buffering instead.
stderr is reconfigured too, for consistency: Python line-buffers it by
default since 3.9.
The type-ignores are for mypy, which types these handles as TextIO — an
interface without reconfigure.
Fixes #12934.
Assisted-by: Claude Fable 5
- - - - -
9b5beaa2 by Florian Ragwitz at 2026-10-13T18:12:05-04:00
hpc: Improve coverage semantics for instance methods and instances
Users care about which of their explicitly written methods are or aren't
covered, not whether all of the inherited methods are covered as well. Those
should be covered where they are implemented.
We therefore skip generating top-level boxes for inherited methods which will
appear as uncovered with no clear indication as to why, and no way to fix other
than exercising code the user has not written.
Previously, top-level boxes for those inherited methods would use the instance
head as their source span. Now that those boxes are gone, we can use that
source span for another purpose:
We introduce a new top-level box for each class instance with its instance head
as the source span, and use that to indicate whether or not an instance has
been covered at all.
We do this by making any method of the instance, inherited/generated or
otherwise, tick the box for the instance head. Excluded from this are
methodless classes, which could never be covered using the current mechanism.
This could be improved upon further.
These changes apply to ticking for program coverage only, and don't affect
source notes. Additionally, we update the scope of record selector ticking to
be limited to program coverage as well, as the oversight to also extend it to
source notes has previously caused bugs and because record selector ticking is
coverage-specific.
Fixes #17155, #15932.
- - - - -
836ec50a by Simon Peyton Jones at 2026-10-13T18:12:54-04:00
Refactor fundeps again
This MR fixes #27828; there was a bad scoping error in `trim_qtvs`.
The main changes are
* Refactor `trim_qtvs` completely to eliminate the bug.
* Remove a redundant `apartnessCheck` from `mkTopOpenFamEqFDs`.
* Lots of improvements to the Notes in FunDeps.hs
I also did a couple of pure refactors:
* I realised that we were carefully caching `cab_incomps` in each
`CoAxBranch`, to make it more efficient to reduce a type family application,
but we were not doing the same thing when computing relevance for functional
dependencies; see Note [Relevance] in GHC.Tc.Solver.FunDeps. So I added
`cab_overlaps`, which is now used in `noEarlierMatch`.
* Use a proper data types, `AmIUnifying` and `OuterKindsFlag`, for two
previously-Boolean arguments to `tc_unify_tys`. This is a pure refactor.
- - - - -
889ef371 by Simon Peyton Jones at 2026-10-13T18:13:36-04:00
Refactor and simplify solver's unification code
Ticket #27844 showed that GHC's constraint solver could miss an
occurs check, and thereby build an infinite type.
This patch significantly simplifes the code in
GHC.Tc.Solver.Equality.canEqCanLHSFinish_try_unification
GHC.Tc.Solver.Equality.canEqCanLHSFinish_no_unification
It is now significantly simpler, and requires much less subtle
reasoning to understand.
Main changes
* If `canEqCanLHSFinish_try_unification` fails to unify, it now /always/ calls
`canEqCanLHSFinish_no_unification` rather than trying to finish the job itself.
* `GHC.Tc.Solver.Monad.checkTypeEq` is moved from Monad into Equality, and renamed
to `GHC.Tc.Solver.Equality.checkTypeEqNoUnification`.
* `canEqCanLHSFinish_no_unification` calls `checkTypeEqNoUnification` to test
the invariants for an inert equality. Before this MR there was a special case for
`do_not_prevent_rewriting`, but that has gone; instead it's just a consequence of
the flags passed to `checkTyEqRhs`, documented in the `PuOK` case of
`canEqCanLHSFinish_no_unification`.
* There is only one bit of "swap back" code, in `finish_no_unify` in
`canEqCanLHSFinish_try_unification. Previously this code was duplicated.
* `kickOutAfterFillingCoercionHole` should account for equalities with a
TyFamLHS. See (KOC5) in Note [Kick out after filling a coercion hole]
* No need to gather coercion holes in the `PuOK` case of `canEqCanLHSFinish_no_unification`.
See documentation with that code.
- - - - -
f9193e53 by Simon Peyton Jones at 2026-10-13T18:13:37-04:00
One line fix to fallout from
...#27731, !16564, simplifying Tc.Errors machinery
There was an over-eager assert!
- - - - -
cdd56b7a by Florian Ragwitz at 2026-10-13T18:14:19-04:00
Fix several sphinx errors and warnings from rendering the release notes
The extension references which are removed here are for extension which were
already previously undocumented, so just removing them seems fine for now.
- - - - -
4f00da25 by Florian Ragwitz at 2026-10-13T18:14:19-04:00
Link to QualifiedStrings documentation
- - - - -
97adaf89 by Simon Peyton Jones at 2026-10-14T00:07:27+01:00
Line up simpleUnifyCheck and check_ty_eq_rhs
Even after #26543 was allegedly fixed, the original repo case in the
Description continued to fail. The reason was that the QuickLook
unifier, `qlUnify`, used `simpleUnifyCheck` for checking unification
invariants; and `simpleUnifyCheck` conservatively rejected any RHS
with a coercion hole in it. The upshot was that QuickLook was not
as clever as it should be, wrongly failing to do an impredicative
instantiation.
Interestingly `check_ty_eq_rhs`, which does the same job during
constraint solving, was more liberal: it just looked at the free vars
of the coercion, and allowed coercion holes.
This MR lines them up, adding some careful notes. See
Note [simpleUnifyCheck]
Note [Occurs check and coercions]
Note [Unification preconditions] esp (COERCIONS)
Things are better than before, but I am still uncomfortable about the
possibilty that a hole might be filled with a coercion that mentions
the LHS type variable; for now I have left this discomfort documented
in Note [Occurs check and coercions].
Main changes
* `qlUnify` now only unifies /instantiation variables/ not regular unification
variables. This makes QuickLook more predictable. See (UQL6) in
Note [QuickLook unification].
* `qlUnify` no longer needs to call `simpleUnifyCheck`, so we can get rid of
`UC_QuickLook` and its code in `simpleUnifyCheck`.
* I found I could get rid of `mkOccFolders` in favour of `anyFreeVarsOfType`.
Hooray.
* Improve documentation of CycleBreakerTv, and rename it to GivenCycleBreakerTv
because they are only uesd for Givens!
* I accepted a 9% worsening in compile time allocation on T5030
because the newly-consistent story triggered #27934.
Other changes
* I refactored `atvFolder` so that it pairs the "interesting-var" function
with the in-scope set, to avoid building a closure with a free variable.
Now we get nice tight loops for `anyFreeVarsOfType` and friends.
See Note [Any-free-var folder].
Metric Increase:
T5030
- - - - -
5f7b3047 by Simon Peyton Jones at 2026-10-14T00:07:27+01:00
Fix order-dependence in QuickLook
Ticket #27917 pointed out that QuickLook was order-dependent
-- very bad!
The solution is in `qlUnify`: spot when we are unifying a type with a
definite monotype, and then monomorphise any free instantiation
variables of that type.
See (UQL8) and (UQL9) in Note [QuickLook unification].
- - - - -
c391c70c by Simon Peyton Jones at 2026-10-14T00:07:28+01:00
Add some comments about RuntimeUnk
This commit just adds comments explaining why we don't need to worry about
RuntimeUnkTv in the constraint solver.
It also tightens up docmentation of earlier (overlapping) commits in
this MR.
- - - - -
7df3ba2f by Andrea Vezzosi at 2026-10-14T06:15:48-04:00
add runGhcWithSignalHandlers and remove handling from runGhc[T]
it only ever makes sense to call `withSignalHandlers` from `main`, otherwise
signals can be too easily swallowed without notification to the rest of your
process.
This commit takes withSignalHandlers out of `runGhc/runGhcT` and provides
`runGhcWithSignalHandlers` for the old behaviour.
- - - - -
3a72b8a2 by Hannes Siebenhandl at 2026-10-14T13:48:32-04:00
Fix #27836, normalise unit database path in ExternalUnitDatabases
Add a regression test, proofing that all variations:
- local-unit-db/my-test.conf
- ./local-unit-db/my-test.conf
- ./local-unit-db/my-test.conf/
are parsed only once.
- - - - -
8ddbc6f9 by Florian Ragwitz at 2026-10-14T13:49:28-04:00
Remove obsolete HPC types
Fixes #27946.
- - - - -
f34c79ee by Alan Zimmerman at 2026-10-15T04:54:47-04:00
EPA: Start using vocurly as basis for AnnListLayout
For the existing cases that populate AnnList.
This uses AnnListBraces when braces are explicitly supplied, and
AnnListLayout when vocurly is used
The change also shows up AnnList usages that can never capture layout,
these are cleared up later.
- - - - -
033ba59c by sheaf at 2026-10-15T04:55:44-04:00
Make exprFreeVars deep
exprFreeVars used to be a shallow free-variable finder (it didn't look
into kinds), but most callers wanted it to be deep. In particular,
'exprFreeVars' is often used to seed an 'InScopeSet', and that must
contain the /deep/ free variables.
This commit makes it deep, which allows us to get rid of calls to
'closeOverKinds' or other workarounds for shallowness in:
- 'GHC.Core.Opt.Simplify.Utils.abstractFloats'
- 'GHC.HsToCore.Binds.dsSpec_help'
- 'GHC.Core.Opt.Arity.etaBodyForJoinPoint'
- 'GHC.Core.FVs.freeVars'
- 'GHC.Core.Lint.lintCoreRule'
We also remove 'deepExprsFreeVarsDSet' and 'closeOverKindsDSet'.
Other places needed a little bit more care, in particular to properly
handle coercion variables free in kinds:
- 'GHC.Core.Opt.Specialise.specHeader' quantifies over the binder of
an unspecialised argument directly, instead of computing the free Ids
of the argument.
- 'GHC.HsToCore.dsWarnRuleShadowing' filters out 'CoVar's.
- 'GHC.Core.Opt.SpecConstr.callToPat' had some ad-hoc logic to compute
argument pattern types and a workaround with 'expandTypeSynonyms'.
That logic is removed in favour of a new 'argsToPats' function which
directly computes the argument pattern types by instantiating the
type of the head of the call pattern.
Fixes #27936
- - - - -
f93d523c by Luite Stegeman at 2026-10-15T04:56:34-04:00
testsuite: Use mkWeakMVar in memo001/memo002
mkWeakPtr in the memo001/memo001 tests created weak pointers
with the MVar box as the key, which is fragile in the presence
of optimization. The fix is using mkWeakMVar, keying on the
primitive MVar# instead.
Fixes #27924 and #27396
- - - - -
8c947573 by Simon Peyton Jones at 2026-10-16T13:11:53+01:00
Improve exprOkForSpeculation
Fixes #27910, which exposed an infelicity in exprOkForSpeculation
The new story is carefully described in new Note [exprOkForSpeculation],
esp (a-c) and (EOKS1).
- - - - -
7dedcf13 by Alan Zimmerman at 2026-10-16T19:03:17-04:00
EPA: Add TTG fields to FamilyInfo
This commit is a simple add, with unused extension fields.
It lays the groundwork for using them for exact print annotations
- - - - -
26b9a8a0 by Arkissa at 2026-10-17T16:04:10+00:00
ghci: Prefer exact source spans in :type-at
Prefer expression types for identical source spans.
Fixes #27412.
- - - - -
70dc4e61 by sheaf at 2026-10-18T18:15:15-04:00
Carefully implement coercion zapping
This commit implements coercion zapping in the rewriter, controlled by
the -fzap-coercions flag (on by default). This significantly reduces
the size of coercions produced when rewriting type family applications,
resulting in much faster compilation. See Note [Coercion zapping]
in GHC.Tc.Solver.Rewrite for an explanation and further details.
The rewriter now keeps track of the `CoVar`s and `CoercionHole`s it uses
when rewriting, which allows computing the dependencies of a zapped
coercion without traversing the coercion the rewriter produced, as
explained in Note [Computing coercion dependencies] in GHC.Tc.Solver.Rewrite.
Accompanying changes:
- Rework how dependencies of 'UnivCo's are tracked, purely for
performance reasons.
We now use the 'UnivCoDeps' datatype instead of '[Coercion]', and
we now insist that 'uco_deps' also contains the CoVars that appear
in the LHS and RHS types of the UnivCo (as a caching mechanism).
- Several performance improvements to the rewriter (e.g. increased
strictness).
- Improvements to the family application cache, including:
- Better documentation.
- Only cache a whole chain of reduction steps.
- Don't put coercion holes in the cache, fixing #27518.
- Allow Core Lint to be called from within the typechecker (and from
within the coercion optimiser).
- Move out "annotation linting" from Core Lint into the general Core
pipeline, to avoid the dependency GHC.Core.Coercion.Opt->GHC.Core.Lint
causing a regression in CountDepsParser due to transitive
dependencies of GHC.Core.Opt.Monad and GHC.Unit.Module.ModGuts.
Fixes #8095 #27336 #27518
Summary of performance numbers
Compile-time byte allocated in GHC's testsuite (0 regressions)
CoOpt_Singletons(normal) ghc/alloc 634,040,332 595,448,728 -6.1% GOOD
FamAppCachePerf(normal) ghc/alloc 495,629,812 191,612,920 -61.3% GOOD
LargeRecord(normal) ghc/alloc 1,226,806,434 966,260,976 -21.2% GOOD
SimplCastPerf(normal) ghc/alloc 160,505,678 148,112,688 -7.7% GOOD
T12227(normal) ghc/alloc 244,668,982 233,037,216 -4.8% GOOD
T12545(normal) ghc/alloc 697,804,842 424,705,152 -39.1% GOOD
T13386(normal) ghc/alloc 422,871,076 35,213,656 -91.7% GOOD
T15703(normal) ghc/alloc 288,402,364 273,692,560 -5.1% GOOD
T26426(normal) ghc/alloc 86,002,052 78,152,104 -9.1% GOOD
T27336(normal) ghc/alloc 498,932,268 35,886,016 -92.8% GOOD
T5030(normal) ghc/alloc 117,057,706 88,785,648 -24.2% GOOD
T5321Fun(normal) ghc/alloc 252,552,628 243,820,176 -3.5% GOOD
T8095(normal) ghc/alloc 768,198,564 127,779,520 -83.4% GOOD
T9872a(normal) ghc/alloc 1,655,675,020 1,406,017,008 -15.1% GOOD
T9872b(normal) ghc/alloc 1,864,180,628 1,644,706,696 -11.8% GOOD
T9872b_defer(normal) ghc/alloc 2,834,585,468 1,657,729,760 -41.5% GOOD
T9872c(normal) ghc/alloc 1,572,573,116 1,354,055,424 -13.9% GOOD
T9872d(normal) ghc/alloc 351,516,004 331,071,424 -5.8% GOOD
TcPlugin_RewritePerf(normal) ghc/alloc 2,063,065,680 1,847,464,272 -10.5% GOOD
Chesskell (github.com/Proxymoron461/chesskell/issues)
Typechecking that the first N plies of kholmovVsBronsteinShort
are a valid chess game:
Plies | GHC 9.14 time/alloc | This commit time/alloc |
-----:|---------------------|------------------------|
2 | 41s/20GB | 0.2s/19MB |
4 | 95s/49GB | 0.3s/25MB |
6 | timed out | 0.6s/522MB |
8 | timed out | 7s/673MB |
10 | timed out | timed out |
Compilation of singletons-base: compile time -28%, allocations -25%
-------------------------
Metric Decrease:
CoOpt_Singletons
FamAppCachePerf
LargeRecord
SimplCastPerf
T12227
T12545
T13386
T15703
T24984
T26426
T27336
T5030
T5321Fun
T8095
T9872a
T9872b
T9872b_defer
T9872c
T9872d
TcPlugin_RewritePerf
-------------------------
Co-Authored-By: Sylvain Henry <sylvain(a)haskus.fr>
- - - - -
3d326d7d by Sylvain Henry at 2026-10-18T18:16:09-04:00
JS: fix stack corruption in h$ap_gen_fast's pushAllRegs (#27624)
The loop added in 9e46990976 ("JS: support more than 128 registers
(#26558)") pushed register N to stack[sp - N - 2] while the switch it
falls through into, and every reader of the h$ap_gen frame, uses
stack[sp - (N - 2)]. Registers >= R32 were therefore written 4 slots
too low: the slots the readers consult were left stale and the frame
below was silently corrupted.
Fix the loop to use the same slot formula as the switch, and add a
regression test: an unknown call to a thunk with 35 argument register
slots, which goes through the generic apply.
Co-Authored-By: Claude Fable 5 <noreply(a)anthropic.com>
- - - - -
6bbca569 by Andreas Klebinger at 2026-10-21T10:01:10+00:00
Fix a few tag inference bugs.
* Treat bottoming functions and nullary join points as functions.
* When generating bytecode don't rely on imported tag sigs.
Fixes #27831, #27841 and #27842.
- - - - -
71808e29 by Sylvain Henry at 2026-10-22T04:50:24-04:00
Add GHC.Internal.Unboxed.Do: do-notation for unboxed values (#27944)
QualifiedDo operators can be representation-polymorphic: a do-block is
expanded into ordinary applications before typechecking, and the only
check on a bound variable is the deferred fixed-runtime-rep check. A
representation-polymorphic (>>=) cannot be defined directly, though,
because its body would bind a variable of unknown representation.
The new module provides such operators for State#-passing code as
methods of a class indexed by RuntimeRep, with one instance per
representation. With optimisation the dictionaries disappear and a
block compiles to the usual nested case expressions:
Ubx.do { x <- readWordArray# mba 0# -- x :: Word#
; writeWordArray# mba 1# x -- unit actions are statements
; Ubx.pure x }
Also add users guide documentation and tests.
Co-Authored-By: Claude Fable 5.1 <noreply(a)anthropic.com>
- - - - -
33247780 by Sylvain Henry at 2026-10-22T04:50:24-04:00
Bignum: use Ubx.do for State#-passing code (#27944)
Rewrite the State#-passing code of the GHC.Internal.Bignum modules
(Primitives, WordArray, BigNat, Natural, Integer, Backend.Native,
Backend.GMP) with the qualified do-notation of GHC.Internal.Unboxed.Do.
Nested case chains such as
case newWordArray# sz s of { (# s, mwa #) ->
case act mwa s of { s ->
unsafeFreezeByteArray# mwa s }}
become
Ubx.do
mwa <- newWordArray# sz
act mwa
unsafeFreezeByteArray# mwa
The optimised Core is unchanged (compared per top-level binding).
BigNat now enables MonoLocalBinds: local loops written with Ubx.do
must stay monomorphic in the state type, otherwise GHC does not turn
them into join points.
Co-Authored-By: Claude Fable 5.1 <noreply(a)anthropic.com>
- - - - -
593f5f5b by Sylvain Henry at 2026-10-22T04:51:16-04:00
JS: remove archive padding after wasm objects (#25665)
On Darwin hosts, emar (llvm-ar) writes archives in the Darwin format when
the first member is not a known object file, which is the case for the
archives of the JS backend. This format pads each member to 8 bytes with
'\n' and includes the padding in the member size. Wasm objects do not
accept trailing bytes: wasm-ld failed with "section too large".
The JS linker now removes this padding when it extracts a wasm object from
an archive. In addition, Hadrian passes --format=gnu to emar for the JS
target. See Note [Wasm objects in Darwin archives].
Also document the format of Cc (wasm) objects in Note [Cc object format].
Co-Authored-By: Claude Opus 5.5 <noreply(a)anthropic.com>
- - - - -
13dff5d0 by L0neGamer at 2026-10-22T21:37:31-04:00
add options for resizing bytearrays (#27244)
add five mutable bytearray resizing operations
for various kinds of pinnedness and aligning.
- prefer unpinned when allocating new array (``resizeMutableByteArrayPreferUnpinned#``; the ``resizeMutableByteArray#`` default)
- prefer pinned when allocating new array (``resizeMutableByteArrayPreferPinned#``)
- prefer aligned and pinned when allocating new array (``resizeMutableByteArrayPreferAlignedPinned#``)
- prefer same as input bytearray when allocating new array (``resizeMutableByteArrayKeepPinnedness#``)
- ensure the output array is aligned and pinned after operation (``resizeMutableByteArrayMakeAlignedPinned#``)
- - - - -
0c17201c by Sylvain Henry at 2026-10-22T21:38:23-04:00
JS: implement performMinorGC and performBlockingMajorGC (#28012)
GHC.Internal.System.Mem imports three C entry points: performMajorGC,
performGC (for performMinorGC) and performBlockingMajorGC. The JS RTS
only defined h$performMajorGC, so calling performMinorGC or
performBlockingMajorGC threw "ReferenceError: h$performGC is not
defined" at runtime.
The JS RTS has a single non-generational collector, so both missing
entry points are now aliases of h$performMajorGC.
Add a test that calls every GC entry point of System.Mem.
Co-Authored-By: Claude Fable 5.1 <noreply(a)anthropic.com>
- - - - -
7a631ff2 by L0neGamer at 2026-10-23T09:11:39-04:00
Mon(a|oi)d of No (Return|Mappend) progress (!15795)
Make non-canonical definitions of return and mappend
non-suppressible errors, and make canonical definitions
of those methods warnings.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/328
- - - - -
14656fd4 by Simon Jakobi at 2026-10-23T09:12:27-04:00
Cmm: keep the CBE substitution idempotent
When blocks are merged over multiple rounds during common block
elimination, a block that won a merge in an earlier round can still
lose a merge in a later round. The substitution map (Subst) used to
record this as a chain: the earlier loser mapped to a block that was
itself eliminated. In PLT terminology, the substitution became
*non-idempotent*. Applying such a substitution with a single lookup
left edges to unreachable blocks in the Cmm graph, eventually leading
to a setInfoTableStackMap panic (#27368).
With this patch, each round's fresh substitutions are applied to the old
ones as they are added (extendSubst), so every eliminated block maps
directly to its final replacement and the substitution stays idempotent.
Fixes #27368.
Assisted-by: Claude Fable 5.1
- - - - -
92848e61 by Evgeny Malyshev at 2026-10-23T20:26:04-04:00
hadrian: Include transitive dependencies in Haddock builds
Haddock needs indirect dependency interfaces to resolve references to
definitions outside a package's direct dependencies. Expose Cabal's
configured dependency closure through ContextData and use it alongside
the direct list, preserving direct-interface precedence.
Bump Shake's cache version for the serialized oracle change. Add a
Hadrian selftest requiring template-haskell's indirect ghc-prim interface.
Fixes #25850.
Fixes #27786.
Assisted-By: OpenAI Codex
Metric Increase:
haddock.Cabal
- - - - -
5e8ae81b by Zubin Duggal at 2026-10-23T20:26:47-04:00
WinIO: Don't confuse Win32 errors and NTSTATUS codes
WinIO misinterpreted NTSTATUS codes as Win32 errors, and had some ad hoc logic to deal with this.
However, this logic was incomplete and resulted in the mishandling of results of certain I/O operations
(see testcase).
Now the `ErrCode` argument in `CompletionCallback` is always the Win32 error code,
and we convert the NTSTATUS using RtlNtStatusToDosError.
Also when an overlapped/async operation such as ReadFile fails immediately,
with a Win32 error such as ERROR_BROKEN_PIPE, we don't get a further completion
notification, so we never recorded the failure. This worked by coincidence
earlier, because `STATUS_PENDING` happened to have the same numerical code as
`ERROR_NO_MORE_ITEMS`, but it doesn't now that we translate `STATUS_PENDING`
into the correct Win32 error code (`ERROR_IO_PENDING`). Fix this by using
the Win32 error value we obtained when an operation returns `STATUS_PENDING`.
Fixes #27971
- - - - -
c42ed66a by Martijn Bastiaan at 2026-10-24T16:00:42+02:00
Add single-threaded test for #27526 + #27123
Issue #27526 is a duplicate of #27123, which has already been fixed in
HEAD. The proposed patch in the former carries a "nicer" regression test
in that it doesn't rely on multi-threading to trigger.
Closes #27526
- - - - -
7f73f515 by Simon Peyton Jones at 2026-10-24T17:29:19-04:00
Refactor QuickLook a bit
This MR simply refactors QuickLook a bit. In particular, it
simplifies `tcApp`, and moves shared code into `finishApp`.
It also adds `Note [QuickLook: arguments before result]`
responding to #26599.
There should be no user-visible changes, except perhaps in error messages,
which improve marginally.
For some reason T24984 compiles 8% faster. I'll take the win!
Metric Decrease:
T24984
- - - - -
a4a3a964 by Alan Zimmerman at 2026-10-24T17:30:03-04:00
EPA: Use AnnList for XClosedTypeFamily
We now have TTG annotations for FamilyInfo.
Make use of it to store the AnnList annotations for a closed type
family.
- - - - -
953e4c7f by sheaf at 2026-10-26T18:19:10-04:00
Rework LogQueue to be a proper queue
Now 'LogQueue' uses a 'TQueue' with a separate 'TVar' to indicate
whether the log queue is finished logging, instead of the previous weird
data representation using a reverse-order '[Maybe Msg]' with 'Nothing'
denoting the end of the queue.
- - - - -
ec29c5fa by Rodrigo Mesquita at 2026-10-26T18:19:10-04:00
Refactor GHC.Driver.MakeAction
Pull out of 'runParPipelines' the logic for creating a 'MakeEnv' ready
to be used by multiple threads, as that will be useful for downsweep as
well (which doesn't fit the 'runPipelines' flow), rather than being just
for upsweep.
The code is moved and re-structured to match the export list, simplify
the sequentiality checks previously both in 'runPipelines' and
'runAllPipelines', which were weirdly similar and confusing; into the
two part step where we need these checks: (1) to construct the MakeEnv,
(2) to run the MakeActions in parallel. These two steps are separate and
used to be too mixed up.
Some additional little simplifications or clean ups here and there.
- - - - -
3fb22073 by Rodrigo Mesquita at 2026-10-26T18:19:11-04:00
Refactor GHC.Driver.Downsweep in preparation for parallel downsweep
Pure refactor to improve the code to facilitate implementing parallel
downsweep in the next commit.
This commit puts a MakeEnv into the DownsweepEnv, gives the fields
proper names and uses RecordWildcards to simplify, rather than passing
around all diagnostic wrappers, driver-message-things and using 10s of
positional fields.
No behavior changes here!
- - - - -
52f385a7 by sheaf at 2026-10-26T18:19:11-04:00
Driver: enableCodeGenForTH in load', not downsweep
enableCodeGenForTH modifies the module graph for planning, creating
fresh temporary paths. So it should only be run when we are about to
execute a build plan (e.g. in load'), so that consumers that want to
know facts about the module graph don't go looking for files that don't
exist yet (in particular 'haddock --no-compilation').
- - - - -
82402d14 by sheaf at 2026-10-26T18:19:11-04:00
2-phase Cache/Search Finder monad
This commit restructures the finder abstraction by introducing the
'FinderM' monad, which splits module lookup operations into two phases:
- a cache-only phase, performing no filesystem access,
- from the first cache miss onwards, a search action which may access
the filesystem.
This allows consumers to distinguish between quick cached results versus
more expensive filesystem search operations.
- - - - -
5c302b40 by sheaf at 2026-10-26T18:19:11-04:00
Separate Home/External finder caches
The caches for home modules and modules from external units have
different lifetimes, needing to be invalidated at different points.
This commit moves the cache for modules from external units into the
'UnitState' type, which keeps the cache correct whenever package flags
or package databases change (setSessionDynFlags, :set -package ...,
Backpack's addUnit).
This also makes it easier to clear the cache of home modules, as they
are now stored separately (obviating the 'isUnitEnvInstalledModule'
check we used to perform).
- - - - -
605fbb96 by sheaf at 2026-10-26T18:19:11-04:00
Add known home modules to the finder cache
The finder looks in the file system for the on-disk source that
corresponds to a Haskell module name. There are two kinds of modules
where we need to bypass this search:
- a file passed directly in the command line, which may not be in any
search path and whose module name may differ from the file name;
- Backpack signatures and modules, which do not exist as files at all.
This commit handles these two situations by adding an immutable
'KnownHomeModules' in the finder cache, which is always consulted first
before doing any search.
This removes the ad-hoc imperative logic which relied on mutating the
finder cache at careful points.
'setModuleGraph' now also takes the known home modules, so that the
module graph and the known home modules are always set consistently.
See Note [Known home modules] in GHC.Unit.Finder.Types.
- - - - -
82718f44 by sheaf at 2026-10-26T18:19:11-04:00
Make 'UnresolvedImport' into a suitable cache key
The goal of this commit is to make 'UnresolvedImport' suitable for use
as a cache key. Specifically, during downsweep we want to be able to
cache module resolution queries. We want to do this using some kind of
map, e.g. (roughly speaking):
Map UnresolvedImport ResolvedImport
For this to work, 'UnresolvedImport' must contain **precisely** the
input data to each resolution computation. In other words:
1. If something changes that materially affects resolution, it must
be stored in the cache key.
2. If changing some input does not materially affect the outcome,
then it must not be stored in the cache key.
To satisfy (1), we change 'UnitNode' to also keep track of the home
unit in whose unit state the unit's dependencies were looked up.
For (2), 'ImportResolution' now stores a 'ModuleLookupScope' instead of an
'UnresolvedImportOrigin'. Plugin imports are expressed with a new
'LookupPlugin' scope. The source location of an import, which is
immaterial to the resolution, is stored out of band outside
'UnresolvedImport', in 'ModSummary'.
- - - - -
d4635c7c by sheaf at 2026-10-26T18:19:11-04:00
Add GHC.Data.Dependent
This commit adds a minimal implementation of dependent sums
('Some', 'DSum') and dependent maps ('DMap').
The implementation is not entirely performance optimal, as there are a
few extraneous allocations compared to the full-blown implementation in
the 'dependent-map' package. For our use case (caching downsweep
computations), this does not matter much.
See GHC.Data.Dependent.
- - - - -
6759533e by sheaf at 2026-10-26T18:19:11-04:00
Driver: structured concurrent worker abstraction
This commit introduces a structured concurrency framework in the style
of the 'ki' library: a collection of threads within a scope.
We implement two kinds of concurrent workers on top of this framework:
- Independent workers cannot wait for one another at all. The only
scheduling operation is to wait for quiescence.
- Coordinating workers declare an STM readiness condition (waiting on
other workers to complete) which gates their start.
See Note [Deterministic concurrent workers] in GHC.Driver.Concurrency.
This commit ports upsweep to this new framework, with downsweep being
left as subsequent work.
Further changes along the way:
- Refactoring of how concurrency is acquired to avoid the footgun of
trying to use a no-op 'AbstractSem' as a lock in the serial case.
- The "re-run with -j1" logic for semaphore opening errors no longer
triggers on late semaphore failures (part-way through a lengthy
computation).
- Logger threads are properly cleaned up on exception, with each
concurrent worker's log queue and local TmpFs properly bracketed.
- The 'GhcMessage -> AnyGhcDiagnostic' and 'Maybe Messager'
arguments of 'depanalE', 'depanalPartial' and 'downsweep', which
were all dead in practice, have been dropped.
- Concurrent logging has been completely overhauled. Each worker has
its own log queue. Workers whose logs are printed as we go are
spawned in the order in which their logs must be printed, now using
a TQueue instead of the old complicated LogQueueQueue mechanism.
'logThread' is replaced by 'withLogPrinter', which runs the thread
that prints the log queues within a concurrent worker scope.
These changes allow us to fix issues with the exception handling:
we now always flush remaining log queues before exiting (even when
the action throws an exception), and exceptions that arise while
printing are properly rethrown. This fixes #28009.
- - - - -
38a99006 by sheaf at 2026-10-26T18:19:11-04:00
Rule-based deterministic concurrent downsweep
This commit rewrites downsweep as a single query-answering rule
(see 'DownsweepRule') that can be executed by concurrent worker threads.
The design allows every expensive operation (preprocessing files with CPP,
parsing headers, reading interfaces) to be performed concurrently
according to the -j<N>/-jsem flags.
See Note [Rules-based downsweep] in GHC.Driver.Downsweep.
The rules are run by "GHC.Driver.Concurrency.runRules" in a demand-driven
way: each worker can demand other workers to run, but never wait on
another worker. Every piece of work is done at most once.
Fixes #27514
Memory usage can increase due to doing more work concurrently:
-------------------------
Metric Increase:
MultiComponentModulesRecomp
MultiComponentModulesRecomp100
mhu-perf
-------------------------
- - - - -
9fa7b7be by sheaf at 2026-10-26T18:19:11-04:00
Acquire/release semaphore tokens more readily
This commit reworks GHC.Driver.MakeSem to use the scoped worker
abstraction of GHC.Utils.Concurrent.Scope. This allows us to get rid of
a lot of the tricky logic in GHC.Driver.MakeSem involving manual
exception handling, thread spawning and lifetime management, etc.
The main user-visible change is that token acquisition is no longer
rate limited (due to a bug, there previously was a 1s rate limit on
acquisition of semaphore tokens), with the release debounce period
shortened from 1s to 10ms.
Other changes:
- With -jsem, the number of capabilities is now capped at the number
of processors, bringing it in line with the -jN behaviour.
- Pending jobs whose wait for a token is interrupted by an exception
are now withdrawn from the jobserver, instead of acquiring a token
that it hung onto without doing useful work.
Fixes #27763
- - - - -
c83c6733 by Alan Zimmerman at 2026-10-26T18:19:55-04:00
EPA: Update AnnClsInstDecl to contain AnnList
It was already separately tracking the '{', '}' and leading ';' values.
This aligns it with layout-introducing parser productions ('vocurly'),
so the layout processing can be handled uniformly
- - - - -
ac870ad5 by Simon Jakobi at 2026-10-28T04:40:42-04:00
X86 NCG: use 32-bit POPCNT for sub-word popcounts
A 32-bit write zero-extends the result to the full register, so we
don't need to emit additional code for this.
We also skip emitting zero-extension instructions for the argument
when it is already visibly zero-extended.
For the byte-wise popcount loop from #24813, this shrinks the popcount
sequence from 5 instructions to 3.
Assisted-by: Claude Fable 5.1
- - - - -
53087373 by Facundo Domínguez at 2026-10-28T04:41:32-04:00
Use a ShortByteString in Serialized instead of [Word8]
This makes the in-memory representation 40x more compact for all values
stored in annotations.
A test is added to measure the representation size of annotations
specified in the compiler input.
The GHC API is modified. All functions that previously handled annotations
in [Word8] form now use ShortByteString. The following definitions have
modified types:
* GHC.findGlobalAnns
* GHC.Tc.Gen.Splice.getAnnotationsByTypeRep
* GHC.Core.Opt.Monad.getAnnotations
* GHC.Core.Opt.Monad.getFirstAnnotations
* GHC.Types.Annotations.deserializeAnns
* GHC.Types.Annotations.findAnns
* GHC.Types.Annotations.findAnnsByTypeRep
* GHC.Serialized.Serialized
* GHC.Serialized.toSerialized
* GHC.Serialized.fromSerialized
* GHC.Serialized.serializeWithData
* GHC.Serialized.deserializeWithData
* GHCi.Message.ReifyAnnotations
Fixes #28002.
- - - - -
cc533b66 by Sasha Bogicevic at 2026-10-31T09:18:15-04:00
Don't report -XStrict-generated bangs under -Wredundant-bang-patterns
The -XStrict flag causes the desugarer to insert bang patterns.
These are not user-written, so -Wredundant-bang-patterns must not
report them.
To achieve this, the desugarer now tracks whether it is desugaring
compiler-generated code (similar to the typechecker's 'tcl_in_gen_code').
Bangs inserted by -XStrict are given generated spans, which suppresses
the "redundant bang" warnings without otherwise affecting pattern-match
warnings.
Fixes #27323
- - - - -
13d38047 by Luite Stegeman at 2026-10-31T09:19:11-04:00
rts: tombstone Weak# copies that lose an evacuation race (#23160)
Mark the losing copy of a Weak# during an evacuation race in parallel
GC with stg_DEAD_WEAK_info. This ensures that the nonmoving GC
doesn't follow dangling pointers, leading to crashes.
Fixes #23160
- - - - -
63347328 by Zubin Duggal at 2026-10-31T09:19:52-04:00
ghci: Drop GHCi's exception context when rethrowing in ghc -e
Fixes #27847.
- - - - -
a85fef3f by Zubin Duggal at 2026-10-31T09:19:52-04:00
base: Preserve exception context in modifyIOError
Fixes #27851.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/446
- - - - -
1d60b591 by Zubin Duggal at 2026-10-31T09:19:52-04:00
base: Preserve exception context in mapException
Fixes #27851.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/446
- - - - -
3c029a1b by Zubin Duggal at 2026-10-31T09:19:52-04:00
base: Preserve exception context when rethrowing exceptions in Handle reads
Fixes #27875.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/447
- - - - -
ab2b317a by Zubin Duggal at 2026-10-31T09:19:52-04:00
base: Preserve exception context when rethrowing exceptions in hClose
Fixes #27875.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/447
- - - - -
f5abf277 by Zubin Duggal at 2026-10-31T09:19:52-04:00
base: Preserve exception context when rethrowing exceptions in Windows openFile
Fixes #27875.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/447
- - - - -
d842c672 by Zubin Duggal at 2026-10-31T09:19:52-04:00
base: Preserve exception context when rethrowing exceptions in executablePath
Fixes #27875.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/447
- - - - -
c5a8bb9f by Simon Peyton Jones at 2026-10-31T09:20:34-04:00
Simplify a tc-trace which could crash the compiler
The trace formatted an error message, which prematurely
read the ExpType in a FunResCtxt.
Solution: don't put call the error message formatting
when tc-tracing.
- - - - -
ab49b1d2 by Simon Peyton Jones at 2026-10-31T09:20:34-04:00
Tiny comment change to uniqAway
- - - - -
6efe4ba3 by Simon Peyton Jones at 2026-10-31T09:20:34-04:00
Make niFixSubst idempotent
I discovered (when fixing #27994) that `niFixSubst` didn't actually
generate an idempotent subsitution despite its claims. It could
return a substitution that mentions domain variables on in its range,
when those variables are hidden inside the kind of a type variable
occurrence. As a result it can generate ill-kinded types. Boo!
The fix is simple, and uses deep substitution.
See Note [Finding the substitution fixpoint]
I don't think it actually /caused/ any bugs, so there is no
regression test.
- - - - -
3b60ae7e by Simon Peyton Jones at 2026-10-31T09:20:34-04:00
Fix a nasty bug in fundeps
This MR fixes #27994, which turned out to be very tricky.
See Note [Exploiting closed type famililes], especially (CF7). I was
ending up with TyVars (not TcTyVars) in the solver, because the
substitution computed in `getRelevantBranches` mixed the two.
The code was just too clever. I ended up simplifying it quite a bit.
For /closed/ families we no longer call `trimQtvs` (was `trim_qtvs`).
Open families still do use `trimQtvs`. See Note [trimQTvs]
This patch also fixes one other buglet in the same code.
* Over-saturated type families were being mis-handled.
See the new use of `saturatedFamApp_maybe`.
- - - - -
e4610f2d by Facundo Domínguez at 2026-10-31T09:21:24-04:00
Have haddock --incremental look for the module in -this-unit-id
- - - - -
bc6c0db6 by sheaf at 2026-10-31T09:22:20-04:00
mightBeFunTy: hotfix for #27979
ce01ccb6 refactored 'GHC.Types.RepType.mightBeFunTy' to look through
unary classes. That change introduced the helper function 'unwrap_type'
which was supposed to always return an unwrapped type, but its fallback
equation mistakenly returned the original type. This caused the
subsequent 'tyConAppTyCon_maybe' to fail in cases where it should
succeed (e.g. looking through foralls).
In this commit, we move all the unary class unwrapping logic into
'unwrapType' where it belonged from the start, and update the
documentation of 'unwrapType' to better explain what it should be used
for (#26695).
Fixes #27979 #26695
-------------------------
Metric Increase:
T5642
-------------------------
- - - - -
233cce46 by Alan Zimmerman at 2026-10-31T09:23:01-04:00
EPA: Tidy up ExactPrint.markAnnListA'
It takes an action which can modify the AnnList, but this
is never used. So remove it.
- - - - -
3594a908 by Sylvain Henry at 2026-10-31T09:23:51-04:00
gitmodules: ignore dirty libffi-clib submodule (#26785)
`./boot` runs autoreconf in libraries/libffi-clib, which leaves
`configure~` behind and rewrites the tracked `aclocal.m4` whenever the
local automake version differs from the one that generated it. Every
checkout then looks dirty. Ignore working-tree changes in the submodule
(`ignore = dirty`); a changed submodule commit is still reported.
Co-Authored-By: Claude Fable 5.1 <noreply(a)anthropic.com>
- - - - -
341223c0 by Rodrigo Mesquita at 2026-10-31T09:24:33-04:00
refactor: Keep the interactive Ids directly rather than Name
Removes things like
names <- map idName ids
map (\i -> let id = find (\x -> i==idName x) names) idso
and is more straightforward because there's less state going around (no
more updating HscEnv as an output)
It also kills `printTypeOfNames` completely, since now we just have the
Ids. No longer `lookupName` names to get back the ids...
```
printTypeOfName :: GHC.GhcMonad m => Name -> m ()
printTypeOfName n
= do maybe_tything <- GHC.lookupName n
case maybe_tything of
Nothing -> return ()
Just thing -> printTyThing thing
```
now is just `printTyThing . AnId`
Also:
```diff
- tythings <- catMaybes `liftM` mapM GHC.lookupName namesSorted
- docs <- mapM pprTypeAndContents [i | AnId i <- tythings]
+ docs <- mapM pprTypeAndContents idsSorted
```
(and yes, in ExecBreaks there are only Ids, no TyThings, bc they are
only constructed by the interpreter execution which can only bind ids.
for TyThings use runDecls which doesn't return execBreaks.)
There's some care to be had to make sure we use the "most refined" Ids,
whereas when using `Name`s we'd always fetch the most refined Id from
scratch.
Fixes #28052
- - - - -
81b07084 by fendor at 2026-11-03T14:08:48+01:00
Refactor Makefile to use phases appropriately
Process the dependency information independently of the Makefile
generation.
Introduces intermediate data types that contain all the relevant
information instead of ad-hoc generation of output lines.
- - - - -
694b40d5 by fendor at 2026-11-03T14:10:09+01:00
Add `-dep-json` flag to `ghc -M`
Add an optional flag to `ghc -M` that allows to write the dependency
information in JSON Lines format.
The JSON Lines format enables us to stream the output of the dependency
generation to a consumer.
The output of `-dep-json` is streamed to a temporary file and then
copied to the final destination to avoid partial writes.
Each line contains one of two possible json objects:
1. A Home Unit Dependency
* Contains the name of the home module, its unit, where it is
located, whether a preprocessor is used, and all of its imports.
Importantly, the imports include `-XExplicitLevelImports`
information.
* If requested via `-include-pkg-deps`, includes imports of external
units, e.g. modules from `base`.
* If requested via `-include-cpp-deps`, files included via CPP.
2. External Unit Dependency
* Only if `-include-pkg-deps` is given
* Contains unit-id, its package name and package id.
- - - - -
a59f5803 by fendor at 2026-11-03T14:12:16+01:00
Add multiple home unit support to `ghc -M`
Allows to process the module graph of multiple home units at once using
the same syntax as `--make` and `--interactive`:
ghc -M -unit @unitA -unit @unitB
The semantics are identical to `--make` and `--interactive`.
Each home unit can declare individually to use `-include-cpp-deps` and
`-include-pkg-deps`.
However, there can only be one output file, and `-dep-json` and
`-dep-makefile` can only be provided at the top of the cli invocation.
We introduce a new GHC API `doMkDepend` that allows to use multiple home
units conveniently.
The output of `-dep-json` and `-dep-makefile` does not change, since we
were careful to choose a format that supports multiple home units from
the start.
Single home units are still accepted like before with no changes.
- - - - -
af83346a by fendor at 2026-11-03T14:12:26+01:00
Deprecate `doMkDependHS` in favour of `doMkDepend`
- - - - -
0fb511ff by fendor at 2026-11-03T14:12:26+01:00
Improve `ghc -M` test-suite
Adds a more extensive test-suite for `ghc -M` mode.
Introduce a dedicated test mode for running `ghc -M` tests more
conveniently.
Adds lots of normalizers that help to write `ghc -M` tests in a platform
independent manner.
Adds utility scripts that help format the output of `ghc -M`.
Add new perf regression tests for json and makefile generation.
Add perf regression test for multiple home unit support.
- - - - -
c46e5830 by fendor at 2026-11-03T14:26:29+01:00
Add support for streaming `ghc -M` to stdout
Adds the flags `-dep-json-stdout` and `-dep-makefile-stdout` which
streams dependency information line-by-line to stdout.
Each dependency generation can be redirected to separate outputs.
Providing any extra `-dep-{json,makefile}[-stdout]` disables the default
generation of the `Makefile` file.
Allows consumers to start processing the dependency information as it
comes in and not waiting for the dependency generation to finish.
`DepStream` abstracts over the possible output handles, which is either
a file or the stdout handle.
Writing to a file requires temporary file paths, thus `DepStream` must
provide a way to perform clean up when dependency processing finished or
when an error is thrown for any reason.
We further decouple the rendering and writing of the result from the
dependency generation, localising side effects and making the code
slightly more readable.
The testsuite now also handles `ghc -M` writing to stdout.
We add a test for each combination of writing to stdout and file,
except for writing both makefile and json.
While it probably works, is really undefined behaviour.
Closes #27937
- - - - -
63b4f6c1 by fendor at 2026-11-03T14:53:13+01:00
`ghc -M`: Add support for link nodes to json output
`LinkNode`s are part of the module graph and indicate that a certain
linking artefact is to be produced from other module graph nodes.
We expose `LinkNode`s in the output of `ghc -M -dep-json`, allowing
consumers to see when a linking artefact is to be produced.
Only the JSON output format of `ghc -M` supports `LinkNode` as it is
unclear how the Makefile output should be retrofitted to express the
dependencies, and whether it would require a feature guard.
Closes #28007
- - - - -
657 changed files:
- .gitmodules
- + changelog.d/25665
- + changelog.d/25850
- changelog.d/26616
- + changelog.d/27368
- + changelog.d/27624
- + changelog.d/27936
- + changelog.d/27971
- + changelog.d/28012
- + changelog.d/T26543
- + changelog.d/T27323
- changelog.d/T27329
- + changelog.d/T27412
- + changelog.d/T27763
- + changelog.d/T27828
- + changelog.d/T27831-bottoming-strict-field
- + changelog.d/T27842-bytecode-imported-tags
- + changelog.d/T27844
- + changelog.d/T27847
- + changelog.d/T27979
- + changelog.d/T27994
- + changelog.d/T28002
- + changelog.d/T28002-api
- + changelog.d/T4162
- changelog.d/boxing-family
- + changelog.d/clc-446
- + changelog.d/clc-447
- + changelog.d/fix-nonmoving-weak-evacuation-race-23160
- + changelog.d/ghc-api-interactive-ids
- + changelog.d/hpc-classinsts
- + changelog.d/hpc-cleanup
- + changelog.d/make-depends-deprecate-doMkDependHS
- + changelog.d/make-depends-json
- + changelog.d/make-depends-link-nodes
- + changelog.d/make-depends-multiple-home-units
- + changelog.d/make-depends-streaming-output
- + changelog.d/monad-of-no-return-canonical
- + changelog.d/ncg-x86-subword-popcnt
- + changelog.d/parallel-downsweep
- + changelog.d/resizeMutableByteArray-pinnedness
- changelog.d/tcplugin_init.md
- + changelog.d/unboxed-do
- changelog.d/unit-index
- + changelog.d/zap-coercions
- compiler/GHC.hs
- compiler/GHC/Builtin.hs
- compiler/GHC/Builtin/WiredIn/Prim.hs
- compiler/GHC/Builtin/WiredIn/Types/Box.hs
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/ByteCode/Asm.hs
- compiler/GHC/Cmm/CommonBlockElim.hs
- compiler/GHC/Cmm/GenericOpt.hs
- compiler/GHC/Cmm/UniqueRenamer.hs
- compiler/GHC/CmmToAsm/CFG/Dominators.hs
- compiler/GHC/CmmToAsm/Dwarf/Types.hs
- compiler/GHC/CmmToAsm/Monad.hs
- compiler/GHC/CmmToAsm/Reg/Graph/Spill.hs
- compiler/GHC/CmmToAsm/Reg/Graph/SpillClean.hs
- compiler/GHC/CmmToAsm/Reg/Graph/SpillCost.hs
- compiler/GHC/CmmToAsm/Reg/Graph/Stats.hs
- compiler/GHC/CmmToAsm/Reg/Linear/State.hs
- compiler/GHC/CmmToAsm/Reg/Linear/Stats.hs
- compiler/GHC/CmmToAsm/Reg/Liveness.hs
- compiler/GHC/CmmToAsm/Wasm/Asm.hs
- compiler/GHC/CmmToAsm/Wasm/Types.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToC.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/Coercion.hs-boot
- compiler/GHC/Core/Coercion/Axiom.hs
- compiler/GHC/Core/Coercion/Opt.hs
- compiler/GHC/Core/DataCon.hs
- compiler/GHC/Core/FVs.hs
- compiler/GHC/Core/FamInstEnv.hs
- compiler/GHC/Core/Lint.hs
- + compiler/GHC/Core/Lint.hs-boot
- compiler/GHC/Core/Map/Type.hs
- compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/CallerCC.hs
- compiler/GHC/Core/Opt/Exitify.hs
- compiler/GHC/Core/Opt/Monad.hs
- compiler/GHC/Core/Opt/Pipeline.hs
- compiler/GHC/Core/Opt/Simplify/Utils.hs
- compiler/GHC/Core/Opt/SpecConstr.hs
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Core/Predicate.hs
- compiler/GHC/Core/Reduction.hs
- compiler/GHC/Core/Seq.hs
- compiler/GHC/Core/SimpleOpt.hs
- compiler/GHC/Core/Subst.hs
- compiler/GHC/Core/TyCo/Compare.hs
- compiler/GHC/Core/TyCo/FVs.hs
- compiler/GHC/Core/TyCo/FVs.hs-boot
- + compiler/GHC/Core/TyCo/Make.hs
- + compiler/GHC/Core/TyCo/Make.hs-boot
- compiler/GHC/Core/TyCo/Ppr.hs
- compiler/GHC/Core/TyCo/Rep.hs
- compiler/GHC/Core/TyCo/Rep.hs-boot
- compiler/GHC/Core/TyCo/Subst.hs
- compiler/GHC/Core/TyCo/Tidy.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Type.hs-boot
- compiler/GHC/Core/Unify.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToIface.hs
- compiler/GHC/CoreToIface.hs-boot
- compiler/GHC/CoreToStg.hs
- + compiler/GHC/Data/Dependent.hs
- compiler/GHC/Data/FastString.hs
- compiler/GHC/Data/OrdList.hs
- compiler/GHC/Data/OsPath.hs
- compiler/GHC/Data/Pair.hs
- compiler/GHC/Data/Word64Map/Internal.hs
- compiler/GHC/Data/Word64Set/Internal.hs
- compiler/GHC/Driver/Backpack.hs
- compiler/GHC/Driver/CmdLine.hs
- + compiler/GHC/Driver/Concurrency.hs
- compiler/GHC/Driver/Config.hs
- + compiler/GHC/Driver/Config/Concurrency.hs
- compiler/GHC/Driver/Config/Core/Lint.hs
- compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Env.hs
- compiler/GHC/Driver/Errors/Ppr.hs
- compiler/GHC/Driver/Errors/Types.hs
- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Driver/Main/Compile.hs
- compiler/GHC/Driver/Main/Passes.hs
- compiler/GHC/Driver/Make.hs
- compiler/GHC/Driver/MakeAction.hs
- compiler/GHC/Driver/MakeFile.hs
- compiler/GHC/Driver/MakeSem.hs
- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/Driver/Pipeline/LogQueue.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Driver/Session/Units.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Dump.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/HsToCore.hs
- compiler/GHC/HsToCore/Binds.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Match/Literal.hs
- compiler/GHC/HsToCore/Monad.hs
- compiler/GHC/HsToCore/Pmc.hs
- compiler/GHC/HsToCore/Pmc/Desugar.hs
- compiler/GHC/HsToCore/Pmc/Types.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/HsToCore/Types.hs
- compiler/GHC/HsToCore/Utils.hs
- compiler/GHC/Iface/Decl.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Ext/Types.hs
- compiler/GHC/Iface/Ext/Utils.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Rename.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Type.hs
- compiler/GHC/Iface/Type.hs-boot
- compiler/GHC/IfaceToCore.hs
- compiler/GHC/JS/Opt/Simple.hs
- compiler/GHC/Linker/Deps.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Header.hs
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Rename/Env.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Runtime/Context.hs
- compiler/GHC/Runtime/Debugger.hs
- compiler/GHC/Runtime/Eval.hs
- compiler/GHC/Runtime/Eval/Types.hs
- compiler/GHC/Runtime/Heap/Inspect.hs
- compiler/GHC/Runtime/Interpreter/JS.hs
- compiler/GHC/Runtime/Loader.hs
- compiler/GHC/Stg/BcPrep.hs
- compiler/GHC/Stg/Debug.hs
- compiler/GHC/Stg/EnforceEpt.hs
- compiler/GHC/Stg/EnforceEpt/Rewrite.hs
- compiler/GHC/Stg/EnforceEpt/TagSig.hs
- compiler/GHC/Stg/EnforceEpt/Types.hs
- compiler/GHC/Stg/Subst.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToJS/Apply.hs
- compiler/GHC/StgToJS/ExprCtx.hs
- compiler/GHC/StgToJS/Linker/Linker.hs
- compiler/GHC/StgToJS/Object.hs
- compiler/GHC/StgToJS/Prim.hs
- compiler/GHC/Tc/Deriv/Functor.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Instance/Family.hs
- compiler/GHC/Tc/Instance/FunDeps.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Tc/Plugin.hs
- compiler/GHC/Tc/Solver/Default.hs
- compiler/GHC/Tc/Solver/Equality.hs
- compiler/GHC/Tc/Solver/FunDeps.hs
- compiler/GHC/Tc/Solver/InertSet.hs
- compiler/GHC/Tc/Solver/Monad.hs
- compiler/GHC/Tc/Solver/Rewrite.hs
- compiler/GHC/Tc/Solver/Solve.hs
- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/Instance.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Types/Constraint.hs
- compiler/GHC/Tc/Utils/Backpack.hs
- compiler/GHC/Tc/Utils/TcMType.hs
- compiler/GHC/Tc/Utils/TcType.hs
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Tc/Zonk/Env.hs
- compiler/GHC/Tc/Zonk/Monad.hs
- compiler/GHC/Tc/Zonk/TcType.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/ThToHs.hs
- compiler/GHC/Types/Annotations.hs
- compiler/GHC/Types/Arity.hs
- compiler/GHC/Types/Basic.hs
- compiler/GHC/Types/Cpr.hs
- compiler/GHC/Types/Demand.hs
- compiler/GHC/Types/Error/Codes.hs
- compiler/GHC/Types/Hint.hs
- compiler/GHC/Types/Hint/Ppr.hs
- compiler/GHC/Types/Id/Info.hs
- compiler/GHC/Types/Name/Env.hs
- compiler/GHC/Types/Name/Occurrence.hs
- compiler/GHC/Types/RepType.hs
- compiler/GHC/Types/Unique/DSM.hs
- compiler/GHC/Types/Unique/DSet.hs
- compiler/GHC/Types/Unique/FM.hs
- compiler/GHC/Types/Unique/Map.hs
- compiler/GHC/Types/Unique/Set.hs
- compiler/GHC/Types/Unique/Supply.hs
- compiler/GHC/Types/UnresolvedImport.hs
- compiler/GHC/Types/Var.hs
- compiler/GHC/Types/Var.hs-boot
- compiler/GHC/Types/Var/Env.hs
- compiler/GHC/Types/Var/FV.hs
- compiler/GHC/Types/Var/Set.hs
- compiler/GHC/Unit/External/Database.hs
- compiler/GHC/Unit/External/ModuleOrigin.hs
- compiler/GHC/Unit/External/Visibility.hs
- compiler/GHC/Unit/Finder.hs
- + compiler/GHC/Unit/Finder/Cache.hs
- compiler/GHC/Unit/Finder/Types.hs
- compiler/GHC/Unit/Module/Graph.hs
- compiler/GHC/Unit/Module/ModSummary.hs
- compiler/GHC/Unit/Module/WholeCoreBindings.hs
- compiler/GHC/Unit/State.hs
- compiler/GHC/Unit/Types.hs
- compiler/GHC/Utils/Binary.hs
- + compiler/GHC/Utils/Concurrent/Scope.hs
- compiler/GHC/Utils/Json.hs
- compiler/GHC/Utils/Monad/Codensity.hs
- + compiler/GHC/Utils/Monad/StrictIdentity.hs
- + compiler/GHC/Utils/Monad/StrictReader.hs
- compiler/GHC/Utils/Monad/State/Strict.hs → compiler/GHC/Utils/Monad/StrictState.hs
- compiler/GHC/Utils/Outputable.hs
- compiler/GHC/Utils/Panic.hs
- compiler/GHC/Utils/Ppr/Colour.hs
- compiler/GHC/Utils/TmpFs.hs
- compiler/Language/Haskell/Syntax/Decls.hs
- compiler/Language/Haskell/Syntax/Extension.hs
- compiler/Language/Haskell/Syntax/Specificity.hs
- compiler/ghc.cabal.in
- docs/users_guide/extending_ghc.rst
- docs/users_guide/exts/literals.rst
- docs/users_guide/exts/qualified_do.rst
- docs/users_guide/exts/type_families.rst
- + docs/users_guide/make-depends-json-schema-1_0.json
- docs/users_guide/separate_compilation.rst
- docs/users_guide/using-warnings.rst
- ghc/GHCi/UI.hs
- ghc/GHCi/UI/Info.hs
- ghc/GHCi/UI/Monad.hs
- ghc/Main.hs
- ghc/ghc-bin.cabal.in
- hadrian/src/Hadrian/Haskell/Cabal/Parse.hs
- hadrian/src/Hadrian/Haskell/Cabal/Type.hs
- hadrian/src/Main.hs
- hadrian/src/Rules/Documentation.hs
- hadrian/src/Rules/Selftest.hs
- hadrian/src/Settings/Builders/Ar.hs
- hadrian/src/Settings/Warnings.hs
- libraries/base/changelog.md
- libraries/base/src/GHC/Base.hs
- libraries/base/src/GHC/Exts.hs
- + libraries/base/tests/IO/T27971.hs
- + libraries/base/tests/IO/T27971.stdout
- libraries/base/tests/IO/all.T
- libraries/base/tests/Memo1.lhs
- libraries/base/tests/Memo2.lhs
- libraries/base/tests/all.T
- libraries/ghc-boot/GHC/Serialized.hs
- libraries/ghc-internal/CHANGELOG.md
- libraries/ghc-internal/ghc-internal.cabal.in
- libraries/ghc-internal/src/GHC/Internal/Base.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/GMP.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Native.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/BigNat.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Natural.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Primitives.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/WordArray.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Windows.hsc
- libraries/ghc-internal/src/GHC/Internal/Event/Windows/FFI.hsc
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Internals.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Text.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Handle/Windows.hs
- libraries/ghc-internal/src/GHC/Internal/IO/Windows/Handle.hsc
- libraries/ghc-internal/src/GHC/Internal/System/Environment/ExecutablePath.hsc
- libraries/ghc-internal/src/GHC/Internal/System/IO/Error.hs
- + libraries/ghc-internal/src/GHC/Internal/Unboxed/Do.hs
- libraries/ghci/GHCi/Message.hs
- libraries/ghci/GHCi/TH.hs
- libraries/ghci/GHCi/TH/Binary.hs
- linters/lint-codes/LintCodes/Static.hs
- rts/PrimOps.cmm
- rts/RtsSymbols.c
- rts/include/stg/MiscClosures.h
- rts/js/environment.js
- rts/sm/Evac.c
- testsuite/driver/my_typing.py
- testsuite/driver/runtests.py
- testsuite/driver/testglobals.py
- testsuite/driver/testlib.py
- testsuite/tests/ado/ado-optimal.hs
- testsuite/tests/ado/ado001.hs
- testsuite/tests/annotations/should_run/Makefile
- + testsuite/tests/annotations/should_run/T16841.hs
- + testsuite/tests/annotations/should_run/T16841.stdout
- testsuite/tests/annotations/should_run/all.T
- + testsuite/tests/bytecode/T27842.hs
- + testsuite/tests/bytecode/T27842.stdout
- + testsuite/tests/bytecode/T27842A.hs
- + testsuite/tests/bytecode/T27842N.hs
- testsuite/tests/bytecode/all.T
- + testsuite/tests/codeGen/should_compile/T27368.hs
- + testsuite/tests/codeGen/should_compile/T27979.hs
- + testsuite/tests/codeGen/should_compile/T27979.stderr
- testsuite/tests/codeGen/should_compile/all.T
- + testsuite/tests/codeGen/should_gen_asm/T24813.asm
- + testsuite/tests/codeGen/should_gen_asm/T24813.cmm
- testsuite/tests/codeGen/should_gen_asm/all.T
- + testsuite/tests/codeGen/should_run/T27624.hs
- + testsuite/tests/codeGen/should_run/T27624.stdout
- testsuite/tests/codeGen/should_run/all.T
- testsuite/tests/concurrent/T13615/Parallel.hs
- testsuite/tests/concurrent/should_run/T21651.hs
- testsuite/tests/concurrent/should_run/setnumcapabilities001.hs
- testsuite/tests/corelint/T27374.hs
- testsuite/tests/count-deps/CountDepsParser.stdout
- testsuite/tests/cpranal/should_run/T20598a.hs
- testsuite/tests/default/default-fail05.stderr
- testsuite/tests/dependent/should_compile/T14729.stderr
- testsuite/tests/deriving/should_compile/T13758.hs
- testsuite/tests/deriving/should_run/all.T
- + testsuite/tests/deriving/should_run/drvrun-canonical-methods.hs
- + testsuite/tests/deriving/should_run/drvrun-canonical-methods.stderr
- + testsuite/tests/deriving/should_run/drvrun-canonical-methods.stdout
- testsuite/tests/determinism/determ017/A.hs
- testsuite/tests/diagnostic-codes/codes.stdout
- testsuite/tests/dmdanal/should_compile/T9208.hs
- testsuite/tests/driver/Makefile
- testsuite/tests/driver/T27461/Makefile
- + testsuite/tests/driver/T27461/T27461c.stderr
- testsuite/tests/driver/T27461/all.T
- + testsuite/tests/driver/T27461/src/Wrong.hs
- + testsuite/tests/driver/T27836/A.hs
- + testsuite/tests/driver/T27836/B.hs
- + testsuite/tests/driver/T27836/C.hs
- + testsuite/tests/driver/T27836/Makefile
- + testsuite/tests/driver/T27836/T27836.stdout
- + testsuite/tests/driver/T27836/all.T
- + testsuite/tests/driver/T27836/unitA
- + testsuite/tests/driver/T27836/unitB
- + testsuite/tests/driver/T27836/unitC
- + testsuite/tests/driver/T28009.hs
- testsuite/tests/driver/all.T
- + testsuite/tests/driver/mkdepend/Makefile
- + testsuite/tests/driver/mkdepend/README.md
- + testsuite/tests/driver/mkdepend/T24384/A.hs
- + testsuite/tests/driver/mkdepend/T24384/C.hs
- + testsuite/tests/driver/mkdepend/T24384/C.hs-boot
- + testsuite/tests/driver/mkdepend/T24384/D.hs
- + testsuite/tests/driver/mkdepend/T24384/E.hs
- + testsuite/tests/driver/mkdepend/T24384/dep-internal/DepInternal.hs
- + testsuite/tests/driver/mkdepend/T24384/dep-internal/dep-internal.pkg
- + testsuite/tests/driver/mkdepend/T24384/dep-public/DepPublic.hs
- + testsuite/tests/driver/mkdepend/T24384/dep-public/dep-public.pkg
- + testsuite/tests/driver/mkdepend/T24384/dep/Dep.hs
- + testsuite/tests/driver/mkdepend/T24384/dep/dep.pkg
- + testsuite/tests/driver/mkdepend/T24384/foo.h
- + testsuite/tests/driver/mkdepend/T24384/lib/B.hs
- + testsuite/tests/driver/mkdepend/T24384/lib/B.hs-boot
- + testsuite/tests/driver/mkdepend/T24384/preproc.sh
- + testsuite/tests/driver/mkdepend/T24384a.stdout
- + testsuite/tests/driver/mkdepend/T24384b.stdout
- + testsuite/tests/driver/mkdepend/T24384c.stdout
- + testsuite/tests/driver/mkdepend/all.T
- + testsuite/tests/driver/mkdepend/format_json.sh
- + testsuite/tests/driver/mkdepend/format_makefile.sh
- + testsuite/tests/driver/mkdepend/mhu01/a/A/Base.hs
- + testsuite/tests/driver/mkdepend/mhu01/a/A/Base.hs-boot
- + testsuite/tests/driver/mkdepend/mhu01/a/A/TH.hs
- + testsuite/tests/driver/mkdepend/mhu01/a/Util.hs
- + testsuite/tests/driver/mkdepend/mhu01/b/B/Normal.hs
- + testsuite/tests/driver/mkdepend/mhu01/b/B/Splice.hs
- + testsuite/tests/driver/mkdepend/mhu01/b/Util.hs
- + testsuite/tests/driver/mkdepend/mhu01/c/C.hs
- + testsuite/tests/driver/mkdepend/mhu01/unitA
- + testsuite/tests/driver/mkdepend/mhu01/unitB
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[Git][ghc/ghc][wip/fendor/dep-stdout] 76 commits: Remove the Eq and Ord instances for ForAllTyFlag
by Hannes Siebenhandl (＠fendor) 03 Nov '26
by Hannes Siebenhandl (＠fendor) 03 Nov '26
03 Nov '26
Hannes Siebenhandl pushed to branch wip/fendor/dep-stdout at Glasgow Haskell Compiler / GHC
Commits:
d07a5176 by Simon Peyton Jones at 2026-10-13T18:10:39-04:00
Remove the Eq and Ord instances for ForAllTyFlag
In Note [Comparing visibility] in GHC.Core.TyCo.Compare we read that
"we always compare ForAllTyFlags with `eqForAllVis` or `cmpForAllVis`"
But alas there was an Eq and Ord instance for ForAllTyFlag, which made it
impossible to check this claim. So I made these changes:
* Move the definition of ForAllTyFlag and its related functions from
L.H.S.Specificity (where it did not belong, since L.H.S didn't use it)
into GHC.Types.Var.
* Remove the Eq and Ord instances for ForAllTyFlag
* Deal with the fallout, by using `eqForAllVis` or related functions.
* In interface files we use IfaceType as a key for a de-deduplication map
See Note [Deduplication during iface binary serialisation]
in GHC.Iface.Binary. For this we need /exact/ comparison, so we use a
newtype wrapper for IfaceForAllTyFlag, and give use `cmpForAllTyFlagExactly`
to implement its Ord instance. Tiresome but easy.
* Rename `toIfaceForAllBndrs` to `toIfaceForAllTyBndrs`
- - - - -
ea5c054d by Simon Peyton Jones at 2026-10-13T18:10:39-04:00
Refactor type and coercion substitution
This MR refactors type and coercion substitution so that they use
TyCoMapper, rather than hand-rolled code. Fundamentally it's a simple
idea, but I had to do quite a bit of refactoring to make it fly.
I got Claude to help me this this refactoring, but I paid careful
attention to every line of code.
Main changes:
* New module GHC.Core.TyCo.Make which defines TyCoMapper, and a bunch of other
simple "smart constructors" for types and coercions. See
GHC.Core.TyCo.Rep Note [The Type-related module hierarchy], esp (TRM1)
* The new TyCoMapper has new fields `tcm_tcapp_ty` and `tcm_tcapp_co` to handle
type-constructor applications. These replace `tcm_tycon`.
* Rewrite GHC.Core.TyCo.Subst to use TyCoMapper
* Rewrite GHC.Core.Type.expandTypeSynonyms to use TyCoMapper.
* Implement `seqType` and `seqCo` with TyCoFolder. To to this I had to add
a `tcf_lit` field to TyCoFolder.
* A new module GHC.Utils.StrictIdentity to define a strict identity monad,
which itself is used for
substTyCoMapper :: TyCoMapper Subst StrictIdentity
* I removed an apparently-unused instance for Binary Levity
Refactoring `seq` functions
* In GHC.Core.Seq, redefine `seqOneShot`, `seqRuleInfo`, and friends to return
`SeqResult`, a new type defined in GHC.Types.Baseic, rather than `()`. We
can define a Monoid instance for `SeqResult` that does the right thing.
* This has knock-on effects across the compiler.
- - - - -
34165e23 by Simon Peyton Jones at 2026-10-13T18:10:39-04:00
Refactor TyCoMapper to take a single monad; add StrictReaderT
TyCoMapper used to be parameterised over both an environment and a
monad, with fields like
tcm_tyvar :: env -> TyVar -> m Type
Now it is parameterised over just the monad:
tcm_tyvar :: TyVar -> m Type
If the mapping needs an environment, `m` is a reader monad over that
environment. Many uses (e.g. zonkTcTypeMapper, swizzleMapper) need no
environment at all, and used to pass a dummy (). The binder field
becomes
tcm_tycobinder :: forall r. TyCoVar -> ForAllTyFlag
-> (TyCoVar -> m r) -> m r
and runs the continuation in the extended environment. mapTyCoX is gone;
only mapTyCo remains.
To make this efficient, the reader monad must use the one-shot trick and
be strict in the environment. So:
* New module GHC.Utils.Monad.StrictReader defines
newtype StrictReaderT r m a
with hand-written instances. The builder of the pattern synonym
`StrictReaderT` is a smart constructor that adds both `oneShot` and a
bang on the environment, so every StrictReaderT computation is strict
in the environment. See Note [Instances for StrictReaderT].
* ZonkT becomes type ZonkT = StrictReaderT ZonkEnv
ZonkM becomes type ZonkM = StrictReaderT ZonkGblEnv IO
replacing their own hand-written instances.
* Substitution uses
type SubstM = StrictReaderT Subst StrictIdentity
substTyCoMapper :: TyCoMapper SubstM
and similarly expandTypeSynonymMapper.
* zonk_tycomapper :: TyCoMapper (ZonkT TcM) is now much simpler.
* swizzleMapper uses StrictIdentity rather than Identity.
* Module renaming, so that the strict monads are all peers in GHC.Utils.Monad:
GHC.Utils.StrictIdentity ==> GHC.Utils.Monad.StrictIdentity
GHC.Utils.Monad.State.Strict ==> GHC.Utils.Monad.StrictState
alongside the new GHC.Utils.Monad.StrictReader.
Co-Authored-By: Claude Opus 5.5 <noreply(a)anthropic.com>
- - - - -
c0299e15 by Simon Jakobi at 2026-10-13T18:11:23-04:00
testsuite: Line-buffer the driver's stdout
Python block-buffers stdout when it is a pipe. This is the case for
example in CI. As a result there is often no indication of progress at
all until the run ends.
To fix this, we configure it explicitly to use line buffering instead.
stderr is reconfigured too, for consistency: Python line-buffers it by
default since 3.9.
The type-ignores are for mypy, which types these handles as TextIO — an
interface without reconfigure.
Fixes #12934.
Assisted-by: Claude Fable 5
- - - - -
9b5beaa2 by Florian Ragwitz at 2026-10-13T18:12:05-04:00
hpc: Improve coverage semantics for instance methods and instances
Users care about which of their explicitly written methods are or aren't
covered, not whether all of the inherited methods are covered as well. Those
should be covered where they are implemented.
We therefore skip generating top-level boxes for inherited methods which will
appear as uncovered with no clear indication as to why, and no way to fix other
than exercising code the user has not written.
Previously, top-level boxes for those inherited methods would use the instance
head as their source span. Now that those boxes are gone, we can use that
source span for another purpose:
We introduce a new top-level box for each class instance with its instance head
as the source span, and use that to indicate whether or not an instance has
been covered at all.
We do this by making any method of the instance, inherited/generated or
otherwise, tick the box for the instance head. Excluded from this are
methodless classes, which could never be covered using the current mechanism.
This could be improved upon further.
These changes apply to ticking for program coverage only, and don't affect
source notes. Additionally, we update the scope of record selector ticking to
be limited to program coverage as well, as the oversight to also extend it to
source notes has previously caused bugs and because record selector ticking is
coverage-specific.
Fixes #17155, #15932.
- - - - -
836ec50a by Simon Peyton Jones at 2026-10-13T18:12:54-04:00
Refactor fundeps again
This MR fixes #27828; there was a bad scoping error in `trim_qtvs`.
The main changes are
* Refactor `trim_qtvs` completely to eliminate the bug.
* Remove a redundant `apartnessCheck` from `mkTopOpenFamEqFDs`.
* Lots of improvements to the Notes in FunDeps.hs
I also did a couple of pure refactors:
* I realised that we were carefully caching `cab_incomps` in each
`CoAxBranch`, to make it more efficient to reduce a type family application,
but we were not doing the same thing when computing relevance for functional
dependencies; see Note [Relevance] in GHC.Tc.Solver.FunDeps. So I added
`cab_overlaps`, which is now used in `noEarlierMatch`.
* Use a proper data types, `AmIUnifying` and `OuterKindsFlag`, for two
previously-Boolean arguments to `tc_unify_tys`. This is a pure refactor.
- - - - -
889ef371 by Simon Peyton Jones at 2026-10-13T18:13:36-04:00
Refactor and simplify solver's unification code
Ticket #27844 showed that GHC's constraint solver could miss an
occurs check, and thereby build an infinite type.
This patch significantly simplifes the code in
GHC.Tc.Solver.Equality.canEqCanLHSFinish_try_unification
GHC.Tc.Solver.Equality.canEqCanLHSFinish_no_unification
It is now significantly simpler, and requires much less subtle
reasoning to understand.
Main changes
* If `canEqCanLHSFinish_try_unification` fails to unify, it now /always/ calls
`canEqCanLHSFinish_no_unification` rather than trying to finish the job itself.
* `GHC.Tc.Solver.Monad.checkTypeEq` is moved from Monad into Equality, and renamed
to `GHC.Tc.Solver.Equality.checkTypeEqNoUnification`.
* `canEqCanLHSFinish_no_unification` calls `checkTypeEqNoUnification` to test
the invariants for an inert equality. Before this MR there was a special case for
`do_not_prevent_rewriting`, but that has gone; instead it's just a consequence of
the flags passed to `checkTyEqRhs`, documented in the `PuOK` case of
`canEqCanLHSFinish_no_unification`.
* There is only one bit of "swap back" code, in `finish_no_unify` in
`canEqCanLHSFinish_try_unification. Previously this code was duplicated.
* `kickOutAfterFillingCoercionHole` should account for equalities with a
TyFamLHS. See (KOC5) in Note [Kick out after filling a coercion hole]
* No need to gather coercion holes in the `PuOK` case of `canEqCanLHSFinish_no_unification`.
See documentation with that code.
- - - - -
f9193e53 by Simon Peyton Jones at 2026-10-13T18:13:37-04:00
One line fix to fallout from
...#27731, !16564, simplifying Tc.Errors machinery
There was an over-eager assert!
- - - - -
cdd56b7a by Florian Ragwitz at 2026-10-13T18:14:19-04:00
Fix several sphinx errors and warnings from rendering the release notes
The extension references which are removed here are for extension which were
already previously undocumented, so just removing them seems fine for now.
- - - - -
4f00da25 by Florian Ragwitz at 2026-10-13T18:14:19-04:00
Link to QualifiedStrings documentation
- - - - -
97adaf89 by Simon Peyton Jones at 2026-10-14T00:07:27+01:00
Line up simpleUnifyCheck and check_ty_eq_rhs
Even after #26543 was allegedly fixed, the original repo case in the
Description continued to fail. The reason was that the QuickLook
unifier, `qlUnify`, used `simpleUnifyCheck` for checking unification
invariants; and `simpleUnifyCheck` conservatively rejected any RHS
with a coercion hole in it. The upshot was that QuickLook was not
as clever as it should be, wrongly failing to do an impredicative
instantiation.
Interestingly `check_ty_eq_rhs`, which does the same job during
constraint solving, was more liberal: it just looked at the free vars
of the coercion, and allowed coercion holes.
This MR lines them up, adding some careful notes. See
Note [simpleUnifyCheck]
Note [Occurs check and coercions]
Note [Unification preconditions] esp (COERCIONS)
Things are better than before, but I am still uncomfortable about the
possibilty that a hole might be filled with a coercion that mentions
the LHS type variable; for now I have left this discomfort documented
in Note [Occurs check and coercions].
Main changes
* `qlUnify` now only unifies /instantiation variables/ not regular unification
variables. This makes QuickLook more predictable. See (UQL6) in
Note [QuickLook unification].
* `qlUnify` no longer needs to call `simpleUnifyCheck`, so we can get rid of
`UC_QuickLook` and its code in `simpleUnifyCheck`.
* I found I could get rid of `mkOccFolders` in favour of `anyFreeVarsOfType`.
Hooray.
* Improve documentation of CycleBreakerTv, and rename it to GivenCycleBreakerTv
because they are only uesd for Givens!
* I accepted a 9% worsening in compile time allocation on T5030
because the newly-consistent story triggered #27934.
Other changes
* I refactored `atvFolder` so that it pairs the "interesting-var" function
with the in-scope set, to avoid building a closure with a free variable.
Now we get nice tight loops for `anyFreeVarsOfType` and friends.
See Note [Any-free-var folder].
Metric Increase:
T5030
- - - - -
5f7b3047 by Simon Peyton Jones at 2026-10-14T00:07:27+01:00
Fix order-dependence in QuickLook
Ticket #27917 pointed out that QuickLook was order-dependent
-- very bad!
The solution is in `qlUnify`: spot when we are unifying a type with a
definite monotype, and then monomorphise any free instantiation
variables of that type.
See (UQL8) and (UQL9) in Note [QuickLook unification].
- - - - -
c391c70c by Simon Peyton Jones at 2026-10-14T00:07:28+01:00
Add some comments about RuntimeUnk
This commit just adds comments explaining why we don't need to worry about
RuntimeUnkTv in the constraint solver.
It also tightens up docmentation of earlier (overlapping) commits in
this MR.
- - - - -
7df3ba2f by Andrea Vezzosi at 2026-10-14T06:15:48-04:00
add runGhcWithSignalHandlers and remove handling from runGhc[T]
it only ever makes sense to call `withSignalHandlers` from `main`, otherwise
signals can be too easily swallowed without notification to the rest of your
process.
This commit takes withSignalHandlers out of `runGhc/runGhcT` and provides
`runGhcWithSignalHandlers` for the old behaviour.
- - - - -
3a72b8a2 by Hannes Siebenhandl at 2026-10-14T13:48:32-04:00
Fix #27836, normalise unit database path in ExternalUnitDatabases
Add a regression test, proofing that all variations:
- local-unit-db/my-test.conf
- ./local-unit-db/my-test.conf
- ./local-unit-db/my-test.conf/
are parsed only once.
- - - - -
8ddbc6f9 by Florian Ragwitz at 2026-10-14T13:49:28-04:00
Remove obsolete HPC types
Fixes #27946.
- - - - -
f34c79ee by Alan Zimmerman at 2026-10-15T04:54:47-04:00
EPA: Start using vocurly as basis for AnnListLayout
For the existing cases that populate AnnList.
This uses AnnListBraces when braces are explicitly supplied, and
AnnListLayout when vocurly is used
The change also shows up AnnList usages that can never capture layout,
these are cleared up later.
- - - - -
033ba59c by sheaf at 2026-10-15T04:55:44-04:00
Make exprFreeVars deep
exprFreeVars used to be a shallow free-variable finder (it didn't look
into kinds), but most callers wanted it to be deep. In particular,
'exprFreeVars' is often used to seed an 'InScopeSet', and that must
contain the /deep/ free variables.
This commit makes it deep, which allows us to get rid of calls to
'closeOverKinds' or other workarounds for shallowness in:
- 'GHC.Core.Opt.Simplify.Utils.abstractFloats'
- 'GHC.HsToCore.Binds.dsSpec_help'
- 'GHC.Core.Opt.Arity.etaBodyForJoinPoint'
- 'GHC.Core.FVs.freeVars'
- 'GHC.Core.Lint.lintCoreRule'
We also remove 'deepExprsFreeVarsDSet' and 'closeOverKindsDSet'.
Other places needed a little bit more care, in particular to properly
handle coercion variables free in kinds:
- 'GHC.Core.Opt.Specialise.specHeader' quantifies over the binder of
an unspecialised argument directly, instead of computing the free Ids
of the argument.
- 'GHC.HsToCore.dsWarnRuleShadowing' filters out 'CoVar's.
- 'GHC.Core.Opt.SpecConstr.callToPat' had some ad-hoc logic to compute
argument pattern types and a workaround with 'expandTypeSynonyms'.
That logic is removed in favour of a new 'argsToPats' function which
directly computes the argument pattern types by instantiating the
type of the head of the call pattern.
Fixes #27936
- - - - -
f93d523c by Luite Stegeman at 2026-10-15T04:56:34-04:00
testsuite: Use mkWeakMVar in memo001/memo002
mkWeakPtr in the memo001/memo001 tests created weak pointers
with the MVar box as the key, which is fragile in the presence
of optimization. The fix is using mkWeakMVar, keying on the
primitive MVar# instead.
Fixes #27924 and #27396
- - - - -
8c947573 by Simon Peyton Jones at 2026-10-16T13:11:53+01:00
Improve exprOkForSpeculation
Fixes #27910, which exposed an infelicity in exprOkForSpeculation
The new story is carefully described in new Note [exprOkForSpeculation],
esp (a-c) and (EOKS1).
- - - - -
7dedcf13 by Alan Zimmerman at 2026-10-16T19:03:17-04:00
EPA: Add TTG fields to FamilyInfo
This commit is a simple add, with unused extension fields.
It lays the groundwork for using them for exact print annotations
- - - - -
26b9a8a0 by Arkissa at 2026-10-17T16:04:10+00:00
ghci: Prefer exact source spans in :type-at
Prefer expression types for identical source spans.
Fixes #27412.
- - - - -
70dc4e61 by sheaf at 2026-10-18T18:15:15-04:00
Carefully implement coercion zapping
This commit implements coercion zapping in the rewriter, controlled by
the -fzap-coercions flag (on by default). This significantly reduces
the size of coercions produced when rewriting type family applications,
resulting in much faster compilation. See Note [Coercion zapping]
in GHC.Tc.Solver.Rewrite for an explanation and further details.
The rewriter now keeps track of the `CoVar`s and `CoercionHole`s it uses
when rewriting, which allows computing the dependencies of a zapped
coercion without traversing the coercion the rewriter produced, as
explained in Note [Computing coercion dependencies] in GHC.Tc.Solver.Rewrite.
Accompanying changes:
- Rework how dependencies of 'UnivCo's are tracked, purely for
performance reasons.
We now use the 'UnivCoDeps' datatype instead of '[Coercion]', and
we now insist that 'uco_deps' also contains the CoVars that appear
in the LHS and RHS types of the UnivCo (as a caching mechanism).
- Several performance improvements to the rewriter (e.g. increased
strictness).
- Improvements to the family application cache, including:
- Better documentation.
- Only cache a whole chain of reduction steps.
- Don't put coercion holes in the cache, fixing #27518.
- Allow Core Lint to be called from within the typechecker (and from
within the coercion optimiser).
- Move out "annotation linting" from Core Lint into the general Core
pipeline, to avoid the dependency GHC.Core.Coercion.Opt->GHC.Core.Lint
causing a regression in CountDepsParser due to transitive
dependencies of GHC.Core.Opt.Monad and GHC.Unit.Module.ModGuts.
Fixes #8095 #27336 #27518
Summary of performance numbers
Compile-time byte allocated in GHC's testsuite (0 regressions)
CoOpt_Singletons(normal) ghc/alloc 634,040,332 595,448,728 -6.1% GOOD
FamAppCachePerf(normal) ghc/alloc 495,629,812 191,612,920 -61.3% GOOD
LargeRecord(normal) ghc/alloc 1,226,806,434 966,260,976 -21.2% GOOD
SimplCastPerf(normal) ghc/alloc 160,505,678 148,112,688 -7.7% GOOD
T12227(normal) ghc/alloc 244,668,982 233,037,216 -4.8% GOOD
T12545(normal) ghc/alloc 697,804,842 424,705,152 -39.1% GOOD
T13386(normal) ghc/alloc 422,871,076 35,213,656 -91.7% GOOD
T15703(normal) ghc/alloc 288,402,364 273,692,560 -5.1% GOOD
T26426(normal) ghc/alloc 86,002,052 78,152,104 -9.1% GOOD
T27336(normal) ghc/alloc 498,932,268 35,886,016 -92.8% GOOD
T5030(normal) ghc/alloc 117,057,706 88,785,648 -24.2% GOOD
T5321Fun(normal) ghc/alloc 252,552,628 243,820,176 -3.5% GOOD
T8095(normal) ghc/alloc 768,198,564 127,779,520 -83.4% GOOD
T9872a(normal) ghc/alloc 1,655,675,020 1,406,017,008 -15.1% GOOD
T9872b(normal) ghc/alloc 1,864,180,628 1,644,706,696 -11.8% GOOD
T9872b_defer(normal) ghc/alloc 2,834,585,468 1,657,729,760 -41.5% GOOD
T9872c(normal) ghc/alloc 1,572,573,116 1,354,055,424 -13.9% GOOD
T9872d(normal) ghc/alloc 351,516,004 331,071,424 -5.8% GOOD
TcPlugin_RewritePerf(normal) ghc/alloc 2,063,065,680 1,847,464,272 -10.5% GOOD
Chesskell (github.com/Proxymoron461/chesskell/issues)
Typechecking that the first N plies of kholmovVsBronsteinShort
are a valid chess game:
Plies | GHC 9.14 time/alloc | This commit time/alloc |
-----:|---------------------|------------------------|
2 | 41s/20GB | 0.2s/19MB |
4 | 95s/49GB | 0.3s/25MB |
6 | timed out | 0.6s/522MB |
8 | timed out | 7s/673MB |
10 | timed out | timed out |
Compilation of singletons-base: compile time -28%, allocations -25%
-------------------------
Metric Decrease:
CoOpt_Singletons
FamAppCachePerf
LargeRecord
SimplCastPerf
T12227
T12545
T13386
T15703
T24984
T26426
T27336
T5030
T5321Fun
T8095
T9872a
T9872b
T9872b_defer
T9872c
T9872d
TcPlugin_RewritePerf
-------------------------
Co-Authored-By: Sylvain Henry <sylvain(a)haskus.fr>
- - - - -
3d326d7d by Sylvain Henry at 2026-10-18T18:16:09-04:00
JS: fix stack corruption in h$ap_gen_fast's pushAllRegs (#27624)
The loop added in 9e46990976 ("JS: support more than 128 registers
(#26558)") pushed register N to stack[sp - N - 2] while the switch it
falls through into, and every reader of the h$ap_gen frame, uses
stack[sp - (N - 2)]. Registers >= R32 were therefore written 4 slots
too low: the slots the readers consult were left stale and the frame
below was silently corrupted.
Fix the loop to use the same slot formula as the switch, and add a
regression test: an unknown call to a thunk with 35 argument register
slots, which goes through the generic apply.
Co-Authored-By: Claude Fable 5 <noreply(a)anthropic.com>
- - - - -
6bbca569 by Andreas Klebinger at 2026-10-21T10:01:10+00:00
Fix a few tag inference bugs.
* Treat bottoming functions and nullary join points as functions.
* When generating bytecode don't rely on imported tag sigs.
Fixes #27831, #27841 and #27842.
- - - - -
71808e29 by Sylvain Henry at 2026-10-22T04:50:24-04:00
Add GHC.Internal.Unboxed.Do: do-notation for unboxed values (#27944)
QualifiedDo operators can be representation-polymorphic: a do-block is
expanded into ordinary applications before typechecking, and the only
check on a bound variable is the deferred fixed-runtime-rep check. A
representation-polymorphic (>>=) cannot be defined directly, though,
because its body would bind a variable of unknown representation.
The new module provides such operators for State#-passing code as
methods of a class indexed by RuntimeRep, with one instance per
representation. With optimisation the dictionaries disappear and a
block compiles to the usual nested case expressions:
Ubx.do { x <- readWordArray# mba 0# -- x :: Word#
; writeWordArray# mba 1# x -- unit actions are statements
; Ubx.pure x }
Also add users guide documentation and tests.
Co-Authored-By: Claude Fable 5.1 <noreply(a)anthropic.com>
- - - - -
33247780 by Sylvain Henry at 2026-10-22T04:50:24-04:00
Bignum: use Ubx.do for State#-passing code (#27944)
Rewrite the State#-passing code of the GHC.Internal.Bignum modules
(Primitives, WordArray, BigNat, Natural, Integer, Backend.Native,
Backend.GMP) with the qualified do-notation of GHC.Internal.Unboxed.Do.
Nested case chains such as
case newWordArray# sz s of { (# s, mwa #) ->
case act mwa s of { s ->
unsafeFreezeByteArray# mwa s }}
become
Ubx.do
mwa <- newWordArray# sz
act mwa
unsafeFreezeByteArray# mwa
The optimised Core is unchanged (compared per top-level binding).
BigNat now enables MonoLocalBinds: local loops written with Ubx.do
must stay monomorphic in the state type, otherwise GHC does not turn
them into join points.
Co-Authored-By: Claude Fable 5.1 <noreply(a)anthropic.com>
- - - - -
593f5f5b by Sylvain Henry at 2026-10-22T04:51:16-04:00
JS: remove archive padding after wasm objects (#25665)
On Darwin hosts, emar (llvm-ar) writes archives in the Darwin format when
the first member is not a known object file, which is the case for the
archives of the JS backend. This format pads each member to 8 bytes with
'\n' and includes the padding in the member size. Wasm objects do not
accept trailing bytes: wasm-ld failed with "section too large".
The JS linker now removes this padding when it extracts a wasm object from
an archive. In addition, Hadrian passes --format=gnu to emar for the JS
target. See Note [Wasm objects in Darwin archives].
Also document the format of Cc (wasm) objects in Note [Cc object format].
Co-Authored-By: Claude Opus 5.5 <noreply(a)anthropic.com>
- - - - -
13dff5d0 by L0neGamer at 2026-10-22T21:37:31-04:00
add options for resizing bytearrays (#27244)
add five mutable bytearray resizing operations
for various kinds of pinnedness and aligning.
- prefer unpinned when allocating new array (``resizeMutableByteArrayPreferUnpinned#``; the ``resizeMutableByteArray#`` default)
- prefer pinned when allocating new array (``resizeMutableByteArrayPreferPinned#``)
- prefer aligned and pinned when allocating new array (``resizeMutableByteArrayPreferAlignedPinned#``)
- prefer same as input bytearray when allocating new array (``resizeMutableByteArrayKeepPinnedness#``)
- ensure the output array is aligned and pinned after operation (``resizeMutableByteArrayMakeAlignedPinned#``)
- - - - -
0c17201c by Sylvain Henry at 2026-10-22T21:38:23-04:00
JS: implement performMinorGC and performBlockingMajorGC (#28012)
GHC.Internal.System.Mem imports three C entry points: performMajorGC,
performGC (for performMinorGC) and performBlockingMajorGC. The JS RTS
only defined h$performMajorGC, so calling performMinorGC or
performBlockingMajorGC threw "ReferenceError: h$performGC is not
defined" at runtime.
The JS RTS has a single non-generational collector, so both missing
entry points are now aliases of h$performMajorGC.
Add a test that calls every GC entry point of System.Mem.
Co-Authored-By: Claude Fable 5.1 <noreply(a)anthropic.com>
- - - - -
7a631ff2 by L0neGamer at 2026-10-23T09:11:39-04:00
Mon(a|oi)d of No (Return|Mappend) progress (!15795)
Make non-canonical definitions of return and mappend
non-suppressible errors, and make canonical definitions
of those methods warnings.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/328
- - - - -
14656fd4 by Simon Jakobi at 2026-10-23T09:12:27-04:00
Cmm: keep the CBE substitution idempotent
When blocks are merged over multiple rounds during common block
elimination, a block that won a merge in an earlier round can still
lose a merge in a later round. The substitution map (Subst) used to
record this as a chain: the earlier loser mapped to a block that was
itself eliminated. In PLT terminology, the substitution became
*non-idempotent*. Applying such a substitution with a single lookup
left edges to unreachable blocks in the Cmm graph, eventually leading
to a setInfoTableStackMap panic (#27368).
With this patch, each round's fresh substitutions are applied to the old
ones as they are added (extendSubst), so every eliminated block maps
directly to its final replacement and the substitution stays idempotent.
Fixes #27368.
Assisted-by: Claude Fable 5.1
- - - - -
92848e61 by Evgeny Malyshev at 2026-10-23T20:26:04-04:00
hadrian: Include transitive dependencies in Haddock builds
Haddock needs indirect dependency interfaces to resolve references to
definitions outside a package's direct dependencies. Expose Cabal's
configured dependency closure through ContextData and use it alongside
the direct list, preserving direct-interface precedence.
Bump Shake's cache version for the serialized oracle change. Add a
Hadrian selftest requiring template-haskell's indirect ghc-prim interface.
Fixes #25850.
Fixes #27786.
Assisted-By: OpenAI Codex
Metric Increase:
haddock.Cabal
- - - - -
5e8ae81b by Zubin Duggal at 2026-10-23T20:26:47-04:00
WinIO: Don't confuse Win32 errors and NTSTATUS codes
WinIO misinterpreted NTSTATUS codes as Win32 errors, and had some ad hoc logic to deal with this.
However, this logic was incomplete and resulted in the mishandling of results of certain I/O operations
(see testcase).
Now the `ErrCode` argument in `CompletionCallback` is always the Win32 error code,
and we convert the NTSTATUS using RtlNtStatusToDosError.
Also when an overlapped/async operation such as ReadFile fails immediately,
with a Win32 error such as ERROR_BROKEN_PIPE, we don't get a further completion
notification, so we never recorded the failure. This worked by coincidence
earlier, because `STATUS_PENDING` happened to have the same numerical code as
`ERROR_NO_MORE_ITEMS`, but it doesn't now that we translate `STATUS_PENDING`
into the correct Win32 error code (`ERROR_IO_PENDING`). Fix this by using
the Win32 error value we obtained when an operation returns `STATUS_PENDING`.
Fixes #27971
- - - - -
c42ed66a by Martijn Bastiaan at 2026-10-24T16:00:42+02:00
Add single-threaded test for #27526 + #27123
Issue #27526 is a duplicate of #27123, which has already been fixed in
HEAD. The proposed patch in the former carries a "nicer" regression test
in that it doesn't rely on multi-threading to trigger.
Closes #27526
- - - - -
7f73f515 by Simon Peyton Jones at 2026-10-24T17:29:19-04:00
Refactor QuickLook a bit
This MR simply refactors QuickLook a bit. In particular, it
simplifies `tcApp`, and moves shared code into `finishApp`.
It also adds `Note [QuickLook: arguments before result]`
responding to #26599.
There should be no user-visible changes, except perhaps in error messages,
which improve marginally.
For some reason T24984 compiles 8% faster. I'll take the win!
Metric Decrease:
T24984
- - - - -
a4a3a964 by Alan Zimmerman at 2026-10-24T17:30:03-04:00
EPA: Use AnnList for XClosedTypeFamily
We now have TTG annotations for FamilyInfo.
Make use of it to store the AnnList annotations for a closed type
family.
- - - - -
953e4c7f by sheaf at 2026-10-26T18:19:10-04:00
Rework LogQueue to be a proper queue
Now 'LogQueue' uses a 'TQueue' with a separate 'TVar' to indicate
whether the log queue is finished logging, instead of the previous weird
data representation using a reverse-order '[Maybe Msg]' with 'Nothing'
denoting the end of the queue.
- - - - -
ec29c5fa by Rodrigo Mesquita at 2026-10-26T18:19:10-04:00
Refactor GHC.Driver.MakeAction
Pull out of 'runParPipelines' the logic for creating a 'MakeEnv' ready
to be used by multiple threads, as that will be useful for downsweep as
well (which doesn't fit the 'runPipelines' flow), rather than being just
for upsweep.
The code is moved and re-structured to match the export list, simplify
the sequentiality checks previously both in 'runPipelines' and
'runAllPipelines', which were weirdly similar and confusing; into the
two part step where we need these checks: (1) to construct the MakeEnv,
(2) to run the MakeActions in parallel. These two steps are separate and
used to be too mixed up.
Some additional little simplifications or clean ups here and there.
- - - - -
3fb22073 by Rodrigo Mesquita at 2026-10-26T18:19:11-04:00
Refactor GHC.Driver.Downsweep in preparation for parallel downsweep
Pure refactor to improve the code to facilitate implementing parallel
downsweep in the next commit.
This commit puts a MakeEnv into the DownsweepEnv, gives the fields
proper names and uses RecordWildcards to simplify, rather than passing
around all diagnostic wrappers, driver-message-things and using 10s of
positional fields.
No behavior changes here!
- - - - -
52f385a7 by sheaf at 2026-10-26T18:19:11-04:00
Driver: enableCodeGenForTH in load', not downsweep
enableCodeGenForTH modifies the module graph for planning, creating
fresh temporary paths. So it should only be run when we are about to
execute a build plan (e.g. in load'), so that consumers that want to
know facts about the module graph don't go looking for files that don't
exist yet (in particular 'haddock --no-compilation').
- - - - -
82402d14 by sheaf at 2026-10-26T18:19:11-04:00
2-phase Cache/Search Finder monad
This commit restructures the finder abstraction by introducing the
'FinderM' monad, which splits module lookup operations into two phases:
- a cache-only phase, performing no filesystem access,
- from the first cache miss onwards, a search action which may access
the filesystem.
This allows consumers to distinguish between quick cached results versus
more expensive filesystem search operations.
- - - - -
5c302b40 by sheaf at 2026-10-26T18:19:11-04:00
Separate Home/External finder caches
The caches for home modules and modules from external units have
different lifetimes, needing to be invalidated at different points.
This commit moves the cache for modules from external units into the
'UnitState' type, which keeps the cache correct whenever package flags
or package databases change (setSessionDynFlags, :set -package ...,
Backpack's addUnit).
This also makes it easier to clear the cache of home modules, as they
are now stored separately (obviating the 'isUnitEnvInstalledModule'
check we used to perform).
- - - - -
605fbb96 by sheaf at 2026-10-26T18:19:11-04:00
Add known home modules to the finder cache
The finder looks in the file system for the on-disk source that
corresponds to a Haskell module name. There are two kinds of modules
where we need to bypass this search:
- a file passed directly in the command line, which may not be in any
search path and whose module name may differ from the file name;
- Backpack signatures and modules, which do not exist as files at all.
This commit handles these two situations by adding an immutable
'KnownHomeModules' in the finder cache, which is always consulted first
before doing any search.
This removes the ad-hoc imperative logic which relied on mutating the
finder cache at careful points.
'setModuleGraph' now also takes the known home modules, so that the
module graph and the known home modules are always set consistently.
See Note [Known home modules] in GHC.Unit.Finder.Types.
- - - - -
82718f44 by sheaf at 2026-10-26T18:19:11-04:00
Make 'UnresolvedImport' into a suitable cache key
The goal of this commit is to make 'UnresolvedImport' suitable for use
as a cache key. Specifically, during downsweep we want to be able to
cache module resolution queries. We want to do this using some kind of
map, e.g. (roughly speaking):
Map UnresolvedImport ResolvedImport
For this to work, 'UnresolvedImport' must contain **precisely** the
input data to each resolution computation. In other words:
1. If something changes that materially affects resolution, it must
be stored in the cache key.
2. If changing some input does not materially affect the outcome,
then it must not be stored in the cache key.
To satisfy (1), we change 'UnitNode' to also keep track of the home
unit in whose unit state the unit's dependencies were looked up.
For (2), 'ImportResolution' now stores a 'ModuleLookupScope' instead of an
'UnresolvedImportOrigin'. Plugin imports are expressed with a new
'LookupPlugin' scope. The source location of an import, which is
immaterial to the resolution, is stored out of band outside
'UnresolvedImport', in 'ModSummary'.
- - - - -
d4635c7c by sheaf at 2026-10-26T18:19:11-04:00
Add GHC.Data.Dependent
This commit adds a minimal implementation of dependent sums
('Some', 'DSum') and dependent maps ('DMap').
The implementation is not entirely performance optimal, as there are a
few extraneous allocations compared to the full-blown implementation in
the 'dependent-map' package. For our use case (caching downsweep
computations), this does not matter much.
See GHC.Data.Dependent.
- - - - -
6759533e by sheaf at 2026-10-26T18:19:11-04:00
Driver: structured concurrent worker abstraction
This commit introduces a structured concurrency framework in the style
of the 'ki' library: a collection of threads within a scope.
We implement two kinds of concurrent workers on top of this framework:
- Independent workers cannot wait for one another at all. The only
scheduling operation is to wait for quiescence.
- Coordinating workers declare an STM readiness condition (waiting on
other workers to complete) which gates their start.
See Note [Deterministic concurrent workers] in GHC.Driver.Concurrency.
This commit ports upsweep to this new framework, with downsweep being
left as subsequent work.
Further changes along the way:
- Refactoring of how concurrency is acquired to avoid the footgun of
trying to use a no-op 'AbstractSem' as a lock in the serial case.
- The "re-run with -j1" logic for semaphore opening errors no longer
triggers on late semaphore failures (part-way through a lengthy
computation).
- Logger threads are properly cleaned up on exception, with each
concurrent worker's log queue and local TmpFs properly bracketed.
- The 'GhcMessage -> AnyGhcDiagnostic' and 'Maybe Messager'
arguments of 'depanalE', 'depanalPartial' and 'downsweep', which
were all dead in practice, have been dropped.
- Concurrent logging has been completely overhauled. Each worker has
its own log queue. Workers whose logs are printed as we go are
spawned in the order in which their logs must be printed, now using
a TQueue instead of the old complicated LogQueueQueue mechanism.
'logThread' is replaced by 'withLogPrinter', which runs the thread
that prints the log queues within a concurrent worker scope.
These changes allow us to fix issues with the exception handling:
we now always flush remaining log queues before exiting (even when
the action throws an exception), and exceptions that arise while
printing are properly rethrown. This fixes #28009.
- - - - -
38a99006 by sheaf at 2026-10-26T18:19:11-04:00
Rule-based deterministic concurrent downsweep
This commit rewrites downsweep as a single query-answering rule
(see 'DownsweepRule') that can be executed by concurrent worker threads.
The design allows every expensive operation (preprocessing files with CPP,
parsing headers, reading interfaces) to be performed concurrently
according to the -j<N>/-jsem flags.
See Note [Rules-based downsweep] in GHC.Driver.Downsweep.
The rules are run by "GHC.Driver.Concurrency.runRules" in a demand-driven
way: each worker can demand other workers to run, but never wait on
another worker. Every piece of work is done at most once.
Fixes #27514
Memory usage can increase due to doing more work concurrently:
-------------------------
Metric Increase:
MultiComponentModulesRecomp
MultiComponentModulesRecomp100
mhu-perf
-------------------------
- - - - -
9fa7b7be by sheaf at 2026-10-26T18:19:11-04:00
Acquire/release semaphore tokens more readily
This commit reworks GHC.Driver.MakeSem to use the scoped worker
abstraction of GHC.Utils.Concurrent.Scope. This allows us to get rid of
a lot of the tricky logic in GHC.Driver.MakeSem involving manual
exception handling, thread spawning and lifetime management, etc.
The main user-visible change is that token acquisition is no longer
rate limited (due to a bug, there previously was a 1s rate limit on
acquisition of semaphore tokens), with the release debounce period
shortened from 1s to 10ms.
Other changes:
- With -jsem, the number of capabilities is now capped at the number
of processors, bringing it in line with the -jN behaviour.
- Pending jobs whose wait for a token is interrupted by an exception
are now withdrawn from the jobserver, instead of acquiring a token
that it hung onto without doing useful work.
Fixes #27763
- - - - -
c83c6733 by Alan Zimmerman at 2026-10-26T18:19:55-04:00
EPA: Update AnnClsInstDecl to contain AnnList
It was already separately tracking the '{', '}' and leading ';' values.
This aligns it with layout-introducing parser productions ('vocurly'),
so the layout processing can be handled uniformly
- - - - -
ac870ad5 by Simon Jakobi at 2026-10-28T04:40:42-04:00
X86 NCG: use 32-bit POPCNT for sub-word popcounts
A 32-bit write zero-extends the result to the full register, so we
don't need to emit additional code for this.
We also skip emitting zero-extension instructions for the argument
when it is already visibly zero-extended.
For the byte-wise popcount loop from #24813, this shrinks the popcount
sequence from 5 instructions to 3.
Assisted-by: Claude Fable 5.1
- - - - -
53087373 by Facundo Domínguez at 2026-10-28T04:41:32-04:00
Use a ShortByteString in Serialized instead of [Word8]
This makes the in-memory representation 40x more compact for all values
stored in annotations.
A test is added to measure the representation size of annotations
specified in the compiler input.
The GHC API is modified. All functions that previously handled annotations
in [Word8] form now use ShortByteString. The following definitions have
modified types:
* GHC.findGlobalAnns
* GHC.Tc.Gen.Splice.getAnnotationsByTypeRep
* GHC.Core.Opt.Monad.getAnnotations
* GHC.Core.Opt.Monad.getFirstAnnotations
* GHC.Types.Annotations.deserializeAnns
* GHC.Types.Annotations.findAnns
* GHC.Types.Annotations.findAnnsByTypeRep
* GHC.Serialized.Serialized
* GHC.Serialized.toSerialized
* GHC.Serialized.fromSerialized
* GHC.Serialized.serializeWithData
* GHC.Serialized.deserializeWithData
* GHCi.Message.ReifyAnnotations
Fixes #28002.
- - - - -
cc533b66 by Sasha Bogicevic at 2026-10-31T09:18:15-04:00
Don't report -XStrict-generated bangs under -Wredundant-bang-patterns
The -XStrict flag causes the desugarer to insert bang patterns.
These are not user-written, so -Wredundant-bang-patterns must not
report them.
To achieve this, the desugarer now tracks whether it is desugaring
compiler-generated code (similar to the typechecker's 'tcl_in_gen_code').
Bangs inserted by -XStrict are given generated spans, which suppresses
the "redundant bang" warnings without otherwise affecting pattern-match
warnings.
Fixes #27323
- - - - -
13d38047 by Luite Stegeman at 2026-10-31T09:19:11-04:00
rts: tombstone Weak# copies that lose an evacuation race (#23160)
Mark the losing copy of a Weak# during an evacuation race in parallel
GC with stg_DEAD_WEAK_info. This ensures that the nonmoving GC
doesn't follow dangling pointers, leading to crashes.
Fixes #23160
- - - - -
63347328 by Zubin Duggal at 2026-10-31T09:19:52-04:00
ghci: Drop GHCi's exception context when rethrowing in ghc -e
Fixes #27847.
- - - - -
a85fef3f by Zubin Duggal at 2026-10-31T09:19:52-04:00
base: Preserve exception context in modifyIOError
Fixes #27851.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/446
- - - - -
1d60b591 by Zubin Duggal at 2026-10-31T09:19:52-04:00
base: Preserve exception context in mapException
Fixes #27851.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/446
- - - - -
3c029a1b by Zubin Duggal at 2026-10-31T09:19:52-04:00
base: Preserve exception context when rethrowing exceptions in Handle reads
Fixes #27875.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/447
- - - - -
ab2b317a by Zubin Duggal at 2026-10-31T09:19:52-04:00
base: Preserve exception context when rethrowing exceptions in hClose
Fixes #27875.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/447
- - - - -
f5abf277 by Zubin Duggal at 2026-10-31T09:19:52-04:00
base: Preserve exception context when rethrowing exceptions in Windows openFile
Fixes #27875.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/447
- - - - -
d842c672 by Zubin Duggal at 2026-10-31T09:19:52-04:00
base: Preserve exception context when rethrowing exceptions in executablePath
Fixes #27875.
CLC proposal: https://github.com/haskell/core-libraries-committee/issues/447
- - - - -
c5a8bb9f by Simon Peyton Jones at 2026-10-31T09:20:34-04:00
Simplify a tc-trace which could crash the compiler
The trace formatted an error message, which prematurely
read the ExpType in a FunResCtxt.
Solution: don't put call the error message formatting
when tc-tracing.
- - - - -
ab49b1d2 by Simon Peyton Jones at 2026-10-31T09:20:34-04:00
Tiny comment change to uniqAway
- - - - -
6efe4ba3 by Simon Peyton Jones at 2026-10-31T09:20:34-04:00
Make niFixSubst idempotent
I discovered (when fixing #27994) that `niFixSubst` didn't actually
generate an idempotent subsitution despite its claims. It could
return a substitution that mentions domain variables on in its range,
when those variables are hidden inside the kind of a type variable
occurrence. As a result it can generate ill-kinded types. Boo!
The fix is simple, and uses deep substitution.
See Note [Finding the substitution fixpoint]
I don't think it actually /caused/ any bugs, so there is no
regression test.
- - - - -
3b60ae7e by Simon Peyton Jones at 2026-10-31T09:20:34-04:00
Fix a nasty bug in fundeps
This MR fixes #27994, which turned out to be very tricky.
See Note [Exploiting closed type famililes], especially (CF7). I was
ending up with TyVars (not TcTyVars) in the solver, because the
substitution computed in `getRelevantBranches` mixed the two.
The code was just too clever. I ended up simplifying it quite a bit.
For /closed/ families we no longer call `trimQtvs` (was `trim_qtvs`).
Open families still do use `trimQtvs`. See Note [trimQTvs]
This patch also fixes one other buglet in the same code.
* Over-saturated type families were being mis-handled.
See the new use of `saturatedFamApp_maybe`.
- - - - -
e4610f2d by Facundo Domínguez at 2026-10-31T09:21:24-04:00
Have haddock --incremental look for the module in -this-unit-id
- - - - -
bc6c0db6 by sheaf at 2026-10-31T09:22:20-04:00
mightBeFunTy: hotfix for #27979
ce01ccb6 refactored 'GHC.Types.RepType.mightBeFunTy' to look through
unary classes. That change introduced the helper function 'unwrap_type'
which was supposed to always return an unwrapped type, but its fallback
equation mistakenly returned the original type. This caused the
subsequent 'tyConAppTyCon_maybe' to fail in cases where it should
succeed (e.g. looking through foralls).
In this commit, we move all the unary class unwrapping logic into
'unwrapType' where it belonged from the start, and update the
documentation of 'unwrapType' to better explain what it should be used
for (#26695).
Fixes #27979 #26695
-------------------------
Metric Increase:
T5642
-------------------------
- - - - -
233cce46 by Alan Zimmerman at 2026-10-31T09:23:01-04:00
EPA: Tidy up ExactPrint.markAnnListA'
It takes an action which can modify the AnnList, but this
is never used. So remove it.
- - - - -
3594a908 by Sylvain Henry at 2026-10-31T09:23:51-04:00
gitmodules: ignore dirty libffi-clib submodule (#26785)
`./boot` runs autoreconf in libraries/libffi-clib, which leaves
`configure~` behind and rewrites the tracked `aclocal.m4` whenever the
local automake version differs from the one that generated it. Every
checkout then looks dirty. Ignore working-tree changes in the submodule
(`ignore = dirty`); a changed submodule commit is still reported.
Co-Authored-By: Claude Fable 5.1 <noreply(a)anthropic.com>
- - - - -
341223c0 by Rodrigo Mesquita at 2026-10-31T09:24:33-04:00
refactor: Keep the interactive Ids directly rather than Name
Removes things like
names <- map idName ids
map (\i -> let id = find (\x -> i==idName x) names) idso
and is more straightforward because there's less state going around (no
more updating HscEnv as an output)
It also kills `printTypeOfNames` completely, since now we just have the
Ids. No longer `lookupName` names to get back the ids...
```
printTypeOfName :: GHC.GhcMonad m => Name -> m ()
printTypeOfName n
= do maybe_tything <- GHC.lookupName n
case maybe_tything of
Nothing -> return ()
Just thing -> printTyThing thing
```
now is just `printTyThing . AnId`
Also:
```diff
- tythings <- catMaybes `liftM` mapM GHC.lookupName namesSorted
- docs <- mapM pprTypeAndContents [i | AnId i <- tythings]
+ docs <- mapM pprTypeAndContents idsSorted
```
(and yes, in ExecBreaks there are only Ids, no TyThings, bc they are
only constructed by the interpreter execution which can only bind ids.
for TyThings use runDecls which doesn't return execBreaks.)
There's some care to be had to make sure we use the "most refined" Ids,
whereas when using `Name`s we'd always fetch the most refined Id from
scratch.
Fixes #28052
- - - - -
81b07084 by fendor at 2026-11-03T14:08:48+01:00
Refactor Makefile to use phases appropriately
Process the dependency information independently of the Makefile
generation.
Introduces intermediate data types that contain all the relevant
information instead of ad-hoc generation of output lines.
- - - - -
694b40d5 by fendor at 2026-11-03T14:10:09+01:00
Add `-dep-json` flag to `ghc -M`
Add an optional flag to `ghc -M` that allows to write the dependency
information in JSON Lines format.
The JSON Lines format enables us to stream the output of the dependency
generation to a consumer.
The output of `-dep-json` is streamed to a temporary file and then
copied to the final destination to avoid partial writes.
Each line contains one of two possible json objects:
1. A Home Unit Dependency
* Contains the name of the home module, its unit, where it is
located, whether a preprocessor is used, and all of its imports.
Importantly, the imports include `-XExplicitLevelImports`
information.
* If requested via `-include-pkg-deps`, includes imports of external
units, e.g. modules from `base`.
* If requested via `-include-cpp-deps`, files included via CPP.
2. External Unit Dependency
* Only if `-include-pkg-deps` is given
* Contains unit-id, its package name and package id.
- - - - -
a59f5803 by fendor at 2026-11-03T14:12:16+01:00
Add multiple home unit support to `ghc -M`
Allows to process the module graph of multiple home units at once using
the same syntax as `--make` and `--interactive`:
ghc -M -unit @unitA -unit @unitB
The semantics are identical to `--make` and `--interactive`.
Each home unit can declare individually to use `-include-cpp-deps` and
`-include-pkg-deps`.
However, there can only be one output file, and `-dep-json` and
`-dep-makefile` can only be provided at the top of the cli invocation.
We introduce a new GHC API `doMkDepend` that allows to use multiple home
units conveniently.
The output of `-dep-json` and `-dep-makefile` does not change, since we
were careful to choose a format that supports multiple home units from
the start.
Single home units are still accepted like before with no changes.
- - - - -
af83346a by fendor at 2026-11-03T14:12:26+01:00
Deprecate `doMkDependHS` in favour of `doMkDepend`
- - - - -
0fb511ff by fendor at 2026-11-03T14:12:26+01:00
Improve `ghc -M` test-suite
Adds a more extensive test-suite for `ghc -M` mode.
Introduce a dedicated test mode for running `ghc -M` tests more
conveniently.
Adds lots of normalizers that help to write `ghc -M` tests in a platform
independent manner.
Adds utility scripts that help format the output of `ghc -M`.
Add new perf regression tests for json and makefile generation.
Add perf regression test for multiple home unit support.
- - - - -
c46e5830 by fendor at 2026-11-03T14:26:29+01:00
Add support for streaming `ghc -M` to stdout
Adds the flags `-dep-json-stdout` and `-dep-makefile-stdout` which
streams dependency information line-by-line to stdout.
Each dependency generation can be redirected to separate outputs.
Providing any extra `-dep-{json,makefile}[-stdout]` disables the default
generation of the `Makefile` file.
Allows consumers to start processing the dependency information as it
comes in and not waiting for the dependency generation to finish.
`DepStream` abstracts over the possible output handles, which is either
a file or the stdout handle.
Writing to a file requires temporary file paths, thus `DepStream` must
provide a way to perform clean up when dependency processing finished or
when an error is thrown for any reason.
We further decouple the rendering and writing of the result from the
dependency generation, localising side effects and making the code
slightly more readable.
The testsuite now also handles `ghc -M` writing to stdout.
We add a test for each combination of writing to stdout and file,
except for writing both makefile and json.
While it probably works, is really undefined behaviour.
Closes #27937
- - - - -
636 changed files:
- .gitmodules
- + changelog.d/25665
- + changelog.d/25850
- changelog.d/26616
- + changelog.d/27368
- + changelog.d/27624
- + changelog.d/27936
- + changelog.d/27971
- + changelog.d/28012
- + changelog.d/T26543
- + changelog.d/T27323
- changelog.d/T27329
- + changelog.d/T27412
- + changelog.d/T27763
- + changelog.d/T27828
- + changelog.d/T27831-bottoming-strict-field
- + changelog.d/T27842-bytecode-imported-tags
- + changelog.d/T27844
- + changelog.d/T27847
- + changelog.d/T27979
- + changelog.d/T27994
- + changelog.d/T28002
- + changelog.d/T28002-api
- + changelog.d/T4162
- changelog.d/boxing-family
- + changelog.d/clc-446
- + changelog.d/clc-447
- + changelog.d/fix-nonmoving-weak-evacuation-race-23160
- + changelog.d/ghc-api-interactive-ids
- + changelog.d/hpc-classinsts
- + changelog.d/hpc-cleanup
- + changelog.d/make-depends-deprecate-doMkDependHS
- + changelog.d/make-depends-json
- + changelog.d/make-depends-multiple-home-units
- + changelog.d/make-depends-streaming-output
- + changelog.d/monad-of-no-return-canonical
- + changelog.d/ncg-x86-subword-popcnt
- + changelog.d/parallel-downsweep
- + changelog.d/resizeMutableByteArray-pinnedness
- changelog.d/tcplugin_init.md
- + changelog.d/unboxed-do
- changelog.d/unit-index
- + changelog.d/zap-coercions
- compiler/GHC.hs
- compiler/GHC/Builtin.hs
- compiler/GHC/Builtin/WiredIn/Prim.hs
- compiler/GHC/Builtin/WiredIn/Types/Box.hs
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/ByteCode/Asm.hs
- compiler/GHC/Cmm/CommonBlockElim.hs
- compiler/GHC/Cmm/GenericOpt.hs
- compiler/GHC/Cmm/UniqueRenamer.hs
- compiler/GHC/CmmToAsm/CFG/Dominators.hs
- compiler/GHC/CmmToAsm/Dwarf/Types.hs
- compiler/GHC/CmmToAsm/Monad.hs
- compiler/GHC/CmmToAsm/Reg/Graph/Spill.hs
- compiler/GHC/CmmToAsm/Reg/Graph/SpillClean.hs
- compiler/GHC/CmmToAsm/Reg/Graph/SpillCost.hs
- compiler/GHC/CmmToAsm/Reg/Graph/Stats.hs
- compiler/GHC/CmmToAsm/Reg/Linear/State.hs
- compiler/GHC/CmmToAsm/Reg/Linear/Stats.hs
- compiler/GHC/CmmToAsm/Reg/Liveness.hs
- compiler/GHC/CmmToAsm/Wasm/Asm.hs
- compiler/GHC/CmmToAsm/Wasm/Types.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToC.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/Coercion.hs-boot
- compiler/GHC/Core/Coercion/Axiom.hs
- compiler/GHC/Core/Coercion/Opt.hs
- compiler/GHC/Core/DataCon.hs
- compiler/GHC/Core/FVs.hs
- compiler/GHC/Core/FamInstEnv.hs
- compiler/GHC/Core/Lint.hs
- + compiler/GHC/Core/Lint.hs-boot
- compiler/GHC/Core/Map/Type.hs
- compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/CallerCC.hs
- compiler/GHC/Core/Opt/Exitify.hs
- compiler/GHC/Core/Opt/Monad.hs
- compiler/GHC/Core/Opt/Pipeline.hs
- compiler/GHC/Core/Opt/Simplify/Utils.hs
- compiler/GHC/Core/Opt/SpecConstr.hs
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Core/Predicate.hs
- compiler/GHC/Core/Reduction.hs
- compiler/GHC/Core/Seq.hs
- compiler/GHC/Core/SimpleOpt.hs
- compiler/GHC/Core/Subst.hs
- compiler/GHC/Core/TyCo/Compare.hs
- compiler/GHC/Core/TyCo/FVs.hs
- compiler/GHC/Core/TyCo/FVs.hs-boot
- + compiler/GHC/Core/TyCo/Make.hs
- + compiler/GHC/Core/TyCo/Make.hs-boot
- compiler/GHC/Core/TyCo/Ppr.hs
- compiler/GHC/Core/TyCo/Rep.hs
- compiler/GHC/Core/TyCo/Rep.hs-boot
- compiler/GHC/Core/TyCo/Subst.hs
- compiler/GHC/Core/TyCo/Tidy.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Type.hs-boot
- compiler/GHC/Core/Unify.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToIface.hs
- compiler/GHC/CoreToIface.hs-boot
- compiler/GHC/CoreToStg.hs
- + compiler/GHC/Data/Dependent.hs
- compiler/GHC/Data/FastString.hs
- compiler/GHC/Data/OrdList.hs
- compiler/GHC/Data/OsPath.hs
- compiler/GHC/Data/Pair.hs
- compiler/GHC/Data/Word64Map/Internal.hs
- compiler/GHC/Data/Word64Set/Internal.hs
- compiler/GHC/Driver/Backpack.hs
- compiler/GHC/Driver/CmdLine.hs
- + compiler/GHC/Driver/Concurrency.hs
- compiler/GHC/Driver/Config.hs
- + compiler/GHC/Driver/Config/Concurrency.hs
- compiler/GHC/Driver/Config/Core/Lint.hs
- compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Env.hs
- compiler/GHC/Driver/Errors/Ppr.hs
- compiler/GHC/Driver/Errors/Types.hs
- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Driver/Main/Compile.hs
- compiler/GHC/Driver/Main/Passes.hs
- compiler/GHC/Driver/Make.hs
- compiler/GHC/Driver/MakeAction.hs
- compiler/GHC/Driver/MakeFile.hs
- compiler/GHC/Driver/MakeSem.hs
- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/Driver/Pipeline/LogQueue.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Driver/Session/Units.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Dump.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/HsToCore.hs
- compiler/GHC/HsToCore/Binds.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Match/Literal.hs
- compiler/GHC/HsToCore/Monad.hs
- compiler/GHC/HsToCore/Pmc.hs
- compiler/GHC/HsToCore/Pmc/Desugar.hs
- compiler/GHC/HsToCore/Pmc/Types.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/HsToCore/Types.hs
- compiler/GHC/HsToCore/Utils.hs
- compiler/GHC/Iface/Decl.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Ext/Types.hs
- compiler/GHC/Iface/Ext/Utils.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Rename.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Type.hs
- compiler/GHC/Iface/Type.hs-boot
- compiler/GHC/IfaceToCore.hs
- compiler/GHC/JS/Opt/Simple.hs
- compiler/GHC/Linker/Deps.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Header.hs
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Rename/Env.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Runtime/Context.hs
- compiler/GHC/Runtime/Debugger.hs
- compiler/GHC/Runtime/Eval.hs
- compiler/GHC/Runtime/Eval/Types.hs
- compiler/GHC/Runtime/Heap/Inspect.hs
- compiler/GHC/Runtime/Interpreter/JS.hs
- compiler/GHC/Runtime/Loader.hs
- compiler/GHC/Stg/BcPrep.hs
- compiler/GHC/Stg/Debug.hs
- compiler/GHC/Stg/EnforceEpt.hs
- compiler/GHC/Stg/EnforceEpt/Rewrite.hs
- compiler/GHC/Stg/EnforceEpt/TagSig.hs
- compiler/GHC/Stg/EnforceEpt/Types.hs
- compiler/GHC/Stg/Subst.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToJS/Apply.hs
- compiler/GHC/StgToJS/ExprCtx.hs
- compiler/GHC/StgToJS/Linker/Linker.hs
- compiler/GHC/StgToJS/Object.hs
- compiler/GHC/StgToJS/Prim.hs
- compiler/GHC/Tc/Deriv/Functor.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Instance/Family.hs
- compiler/GHC/Tc/Instance/FunDeps.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Tc/Plugin.hs
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- utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Utils.hs
- utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
- utils/haddock/haddock-api/src/Haddock/Convert.hs
- utils/haddock/haddock-api/src/Haddock/Interface.hs
- utils/haddock/haddock-api/src/Haddock/Interface/ParseModuleHeader.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
- utils/haddock/haddock-api/src/Haddock/Types.hs
- utils/haddock/haddock-api/src/Haddock/Utils/Json.hs
- utils/haddock/haddock-api/test/Haddock/Backends/Hyperlinker/ParserSpec.hs
- utils/haddock/haddock-library/haddock-library.cabal
- utils/haddock/haddock.cabal
- utils/runghc/Main.hs
The diff was not included because it is too large.
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[Git][ghc/ghc][wip/andreask/cfg-fix] x86 ncg: Track the current block in NatM to keep the CFG in sync
by Sylvain Henry (＠hsyl20) 03 Nov '26
by Sylvain Henry (＠hsyl20) 03 Nov '26
03 Nov '26
Sylvain Henry pushed to branch wip/andreask/cfg-fix at Glasgow Haskell Compiler / GHC
Commits:
b0a084a0 by Andreas Klebinger at 2026-11-03T13:37:18+01:00
x86 ncg: Track the current block in NatM to keep the CFG in sync
The x86 NCG maintains a CFG that is used for code layout. Whenever
instruction selection introduces new basic blocks (for instance for
word-to-float conversions, cmpxchg based atomic operations, ctz on
i386 or 64-bit shifts on i386) it must update this CFG, and the code
that follows must use the new block as its origin.
Before this patch the current block was threaded explicitly through
some statement-level functions only. Block-introducing primops that
were dispatched as "simple" (word2Float#, #27915) and the 64-bit shifts
in iselExpr64 did not update the CFG at all. This resulted in an
out-of-sync CFG, bad code layout and the "Can't find weight for edge
that should have one" panic once the register allocator inserted
fixup blocks (#27694, #27915).
We now keep the current block in the NatM state and provide a few
combinators (continueInNewBlock, addCondBlock, addDiamondFlow,
addColdSelfLoop, increaseEdgeWeight) that update the CFG and the
current block at the same time. See Note [Updating the CFG during
CodeGen] in GHC.CmmToAsm.Monad.
The cfg sanity check (-dasm-lint) now also checks that the branches in
the generated code and the edges in the CFG match both ways (call edges
excepted), which catches this class of bug early. It immediately found
another desync: when the register allocator needs more stack than
preallocated, allocMoreStack moves the body of every entry block into a
new block and retargets the local jumps to it, but the CFG only recorded
the new block as the immediate successor of the entry block. The new
addPreentryBlock also redirects the jump edges (and keeps the call
edges, since returns still go through the entry block).
The x86 code generator now keeps the CFG in sync on i386 too, so
backendMaintainsCfg is enabled for it: i386 gets CFG based code layout,
dead code elimination and the -dasm-lint check.
Fixes #27694, #27915
Co-authored-by: Sylvain Henry <sylvain(a)haskus.fr>
Co-Authored-By: Claude Fable 5.1 <noreply(a)anthropic.com>
- - - - -
14 changed files:
- + changelog.d/27694
- compiler/GHC/CmmToAsm.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/BlockLayout.hs
- compiler/GHC/CmmToAsm/CFG.hs
- compiler/GHC/CmmToAsm/Monad.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToAsm/X86/Instr.hs
- + testsuite/tests/codeGen/should_compile/T27694.hs
- testsuite/tests/codeGen/should_compile/all.T
- + testsuite/tests/codeGen/should_run/T27915.hs
- + testsuite/tests/codeGen/should_run/T27915.stdout-ws-32
- + testsuite/tests/codeGen/should_run/T27915.stdout-ws-64
- testsuite/tests/codeGen/should_run/all.T
The diff was not included because it is too large.
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[Git][ghc/ghc][wip/fendor/dep-json] 5 commits: Refactor Makefile to use phases appropriately
by Hannes Siebenhandl (＠fendor) 03 Nov '26
by Hannes Siebenhandl (＠fendor) 03 Nov '26
03 Nov '26
Hannes Siebenhandl pushed to branch wip/fendor/dep-json at Glasgow Haskell Compiler / GHC
Commits:
81b07084 by fendor at 2026-11-03T14:08:48+01:00
Refactor Makefile to use phases appropriately
Process the dependency information independently of the Makefile
generation.
Introduces intermediate data types that contain all the relevant
information instead of ad-hoc generation of output lines.
- - - - -
694b40d5 by fendor at 2026-11-03T14:10:09+01:00
Add `-dep-json` flag to `ghc -M`
Add an optional flag to `ghc -M` that allows to write the dependency
information in JSON Lines format.
The JSON Lines format enables us to stream the output of the dependency
generation to a consumer.
The output of `-dep-json` is streamed to a temporary file and then
copied to the final destination to avoid partial writes.
Each line contains one of two possible json objects:
1. A Home Unit Dependency
* Contains the name of the home module, its unit, where it is
located, whether a preprocessor is used, and all of its imports.
Importantly, the imports include `-XExplicitLevelImports`
information.
* If requested via `-include-pkg-deps`, includes imports of external
units, e.g. modules from `base`.
* If requested via `-include-cpp-deps`, files included via CPP.
2. External Unit Dependency
* Only if `-include-pkg-deps` is given
* Contains unit-id, its package name and package id.
- - - - -
a59f5803 by fendor at 2026-11-03T14:12:16+01:00
Add multiple home unit support to `ghc -M`
Allows to process the module graph of multiple home units at once using
the same syntax as `--make` and `--interactive`:
ghc -M -unit @unitA -unit @unitB
The semantics are identical to `--make` and `--interactive`.
Each home unit can declare individually to use `-include-cpp-deps` and
`-include-pkg-deps`.
However, there can only be one output file, and `-dep-json` and
`-dep-makefile` can only be provided at the top of the cli invocation.
We introduce a new GHC API `doMkDepend` that allows to use multiple home
units conveniently.
The output of `-dep-json` and `-dep-makefile` does not change, since we
were careful to choose a format that supports multiple home units from
the start.
Single home units are still accepted like before with no changes.
- - - - -
af83346a by fendor at 2026-11-03T14:12:26+01:00
Deprecate `doMkDependHS` in favour of `doMkDepend`
- - - - -
0fb511ff by fendor at 2026-11-03T14:12:26+01:00
Improve `ghc -M` test-suite
Adds a more extensive test-suite for `ghc -M` mode.
Introduce a dedicated test mode for running `ghc -M` tests more
conveniently.
Adds lots of normalizers that help to write `ghc -M` tests in a platform
independent manner.
Adds utility scripts that help format the output of `ghc -M`.
Add new perf regression tests for json and makefile generation.
Add perf regression test for multiple home unit support.
- - - - -
64 changed files:
- + changelog.d/make-depends-deprecate-doMkDependHS
- + changelog.d/make-depends-json
- + changelog.d/make-depends-multiple-home-units
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/MakeFile.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Driver/Session/Units.hs
- compiler/GHC/Utils/Json.hs
- + docs/users_guide/make-depends-json-schema-1_0.json
- docs/users_guide/separate_compilation.rst
- ghc/Main.hs
- testsuite/driver/testglobals.py
- testsuite/driver/testlib.py
- + testsuite/tests/driver/mkdepend/Makefile
- + testsuite/tests/driver/mkdepend/README.md
- + testsuite/tests/driver/mkdepend/T24384/A.hs
- + testsuite/tests/driver/mkdepend/T24384/C.hs
- + testsuite/tests/driver/mkdepend/T24384/C.hs-boot
- + testsuite/tests/driver/mkdepend/T24384/D.hs
- + testsuite/tests/driver/mkdepend/T24384/E.hs
- + testsuite/tests/driver/mkdepend/T24384/dep-internal/DepInternal.hs
- + testsuite/tests/driver/mkdepend/T24384/dep-internal/dep-internal.pkg
- + testsuite/tests/driver/mkdepend/T24384/dep-public/DepPublic.hs
- + testsuite/tests/driver/mkdepend/T24384/dep-public/dep-public.pkg
- + testsuite/tests/driver/mkdepend/T24384/dep/Dep.hs
- + testsuite/tests/driver/mkdepend/T24384/dep/dep.pkg
- + testsuite/tests/driver/mkdepend/T24384/foo.h
- + testsuite/tests/driver/mkdepend/T24384/lib/B.hs
- + testsuite/tests/driver/mkdepend/T24384/lib/B.hs-boot
- + testsuite/tests/driver/mkdepend/T24384/preproc.sh
- + testsuite/tests/driver/mkdepend/T24384a.stdout
- + testsuite/tests/driver/mkdepend/T24384b.stdout
- + testsuite/tests/driver/mkdepend/T24384c.stdout
- + testsuite/tests/driver/mkdepend/all.T
- + testsuite/tests/driver/mkdepend/format_json.sh
- + testsuite/tests/driver/mkdepend/format_makefile.sh
- + testsuite/tests/driver/mkdepend/mhu01/a/A/Base.hs
- + testsuite/tests/driver/mkdepend/mhu01/a/A/Base.hs-boot
- + testsuite/tests/driver/mkdepend/mhu01/a/A/TH.hs
- + testsuite/tests/driver/mkdepend/mhu01/a/Util.hs
- + testsuite/tests/driver/mkdepend/mhu01/b/B/Normal.hs
- + testsuite/tests/driver/mkdepend/mhu01/b/B/Splice.hs
- + testsuite/tests/driver/mkdepend/mhu01/b/Util.hs
- + testsuite/tests/driver/mkdepend/mhu01/c/C.hs
- + testsuite/tests/driver/mkdepend/mhu01/unitA
- + testsuite/tests/driver/mkdepend/mhu01/unitB
- + testsuite/tests/driver/mkdepend/mhu01/unitC
- + testsuite/tests/driver/mkdepend/mhu02/A.hs
- + testsuite/tests/driver/mkdepend/mhu02/B.hs
- + testsuite/tests/driver/mkdepend/mhu02/pp.sh
- + testsuite/tests/driver/mkdepend/mhu02/unitA
- + testsuite/tests/driver/mkdepend/mhu02/unitB
- + testsuite/tests/driver/mkdepend/mhu03/pkg/A.hs
- + testsuite/tests/driver/mkdepend/mhu03/pkg/pp.sh
- + testsuite/tests/driver/mkdepend/mhu03/unitA
- + testsuite/tests/driver/mkdepend/mkdepend01.dep-json
- + testsuite/tests/driver/mkdepend/mkdepend01.dep-makefile
- + testsuite/tests/driver/mkdepend/mkdepend01/A.hs
- + testsuite/tests/driver/mkdepend/mkdepend_mhu01.dep-json
- + testsuite/tests/driver/mkdepend/mkdepend_mhu01.dep-makefile
- + testsuite/tests/driver/mkdepend/mkdepend_mhu02.dep-json
- + testsuite/tests/driver/mkdepend/mkdepend_mhu03.dep-json
- testsuite/tests/perf/compiler/large-project/all.T
- + testsuite/tests/perf/compiler/large-project/large-project-mhu.sh
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[Git][ghc/ghc][wip/fendor/dep-json] 2 commits: fixup! Add `-dep-json` flag to `ghc -M`
by Hannes Siebenhandl (＠fendor) 03 Nov '26
by Hannes Siebenhandl (＠fendor) 03 Nov '26
03 Nov '26
Hannes Siebenhandl pushed to branch wip/fendor/dep-json at Glasgow Haskell Compiler / GHC
Commits:
f5cb4624 by Hannes Siebenhandl at 2026-11-03T13:41:47+01:00
fixup! Add `-dep-json` flag to `ghc -M`
- - - - -
7d0a11ae by Hannes Siebenhandl at 2026-11-03T13:42:00+01:00
fixup! Improve `ghc -M` test-suite
- - - - -
3 changed files:
- docs/users_guide/make-depends-json-schema-1_0.json
- testsuite/tests/driver/mkdepend/mkdepend_mhu02.dep-json
- testsuite/tests/driver/mkdepend/mkdepend_mhu03.dep-json
Changes:
=====================================
docs/users_guide/make-depends-json-schema-1_0.json
=====================================
@@ -60,7 +60,16 @@
"type": "string"
},
"home-module-preprocessor": {
- "type": "string"
+ "type": "object",
+ "properties": {
+ "command": {
+ "type": "string"
+ },
+ "arguments": {
+ "type": "array",
+ "items": { "type": "string" }
+ }
+ }
},
"import": {
"oneOf": [
=====================================
testsuite/tests/driver/mkdepend/mkdepend_mhu02.dep-json
=====================================
@@ -1,2 +1,2 @@
{"module":"A","unit-id":"a-1.0.0-XXX","imports":{},"package-name":"a","source":"mhu02/A.hs"}
-{"module":"B","unit-id":"b-0.1.0-XXX","imports":{},"package-name":"b","source":"mhu02/B.hs","preprocessor":"./mhu02/pp.sh"}
+{"module":"B","unit-id":"b-0.1.0-XXX","imports":{},"package-name":"b","source":"mhu02/B.hs","preprocessor":{"command":"./mhu02/pp.sh"}}
=====================================
testsuite/tests/driver/mkdepend/mkdepend_mhu03.dep-json
=====================================
@@ -1 +1 @@
-{"module":"A","unit-id":"a","imports":{},"source":"mhu03/pkg/A.hs","preprocessor":"./mhu03/pkg/pp.sh"}
+{"module":"A","unit-id":"a","imports":{},"source":"mhu03/pkg/A.hs","preprocessor":{"command":"./mhu03/pkg/pp.sh"}}
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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 6 commits: Consolidate all CPU feature handling
by Marge Bot (＠marge-bot) 03 Nov '26
by Marge Bot (＠marge-bot) 03 Nov '26
03 Nov '26
Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC
Commits:
54cf3c1e by sheaf at 2026-11-03T07:00:23-05:00
Consolidate all CPU feature handling
This commit introduces GHC.Platform.CpuFeatures which consolidates all
of the logic for implications between CPU feature flags (mainly X86):
- DynFlags now only records the set of -m<feature> flags that were
passed, as an EnumSet CpuFeature. That keeps it a simple record of
the flags the user passed, with no post-processing.
- GHC.Platform.CpuFeatures.initCpuFeatures turns this set into a
CpuFeatures value, applying all implications and the per-architecture
baseline. This is the single home for all of the feature implication
logic.
Some datatypes were reworked to better reflect the implication
structure in the types, e.g. SseAvxVersion has a strategically
placed 'FMA' boolean.
- The NCG, LLVM backend, StgToCmm, CPP defines and LLVM -mattr
flags all consult CpuFeatures, via targetCpuFeatures.
See Note [CPU features], which replaces
Note [Implications between X86 CPU feature flags].
Behaviour changes:
- x86 feature flags (-msse3, -mavx, -mavx512*, -mgfni, ...) passed
when targeting a non-x86 architecture no longer cause x86 CPP
macros (__SSE3__, __AVX512BW__, __GFNI__, ...) to be defined, nor
x86 attributes to be passed to LLVM.
- Error messages reported when required CPU features are not enabled
now print out the minimal set of flags required
(e.g. "-mavx512vl" rather than "-mavx512f -mavx512vl").
- - - - -
9af64305 by Luite Stegeman at 2026-11-03T07:01:23-05:00
rts: move stack check to the start of the stg_unpack_cstring thunks
fixes a deadlock
see #27272
- - - - -
a2208b21 by Simon Jakobi at 2026-11-03T07:02:05-05:00
Cmm: exclude the entry block from common block elimination
a1d8139054c had fixed #27722 only partially, because it didn't prevent
elimination of the entry block in later rounds, where the entry block is
no longer guaranteed to come first.
To close this loophole, we exclude the entry block from the CBE merge
logic. See Note [Retain entry block during common block elimination] for
details.
This also deletes a misleading comment regarding unreachable blocks: the
control-flow optimiser doesn't actually guarantee that no unreachable
blocks reach CBE.
Fixes #27722.
Assisted-by: Claude Fable 5.1
- - - - -
37ad4710 by Alan Zimmerman at 2026-11-03T07:02:46-05:00
EPA: Use AnnList for GADT declarations
Continuing the process of using AnnList to capture parser layout
- - - - -
dd9ba96b by ARATA Mizuki at 2026-11-03T07:35:02-05:00
testsuite: Mark T367_letnoescape fragile for the optllvm way
It was marked broken, but it is now unexpectedly passing on aarch64-linux-deb13-validate+llvm.
Marking it fragile for now.
See #7292
- - - - -
96d2c816 by Rodrigo Mesquita at 2026-11-03T07:35:02-05:00
interp: Make resumeExec and ExecBreak use `Resume` directly
Previously, `Resume` contexts were just put directly in the global
interactive environment state, so they were only accessible through it.
However, in the context of multi-threaded debugging, in that many
threads may hit breakpoints, it no longer suffices to have a global
linear list of breakpoints hit. We need a per-breakpoint Resume context
and need to be able to wield it directly rather than going through a
global context.
The driving changes of this commit are:
- Put the Resume data in ExecBreak
- Make resumeExec receive a Resume as an argument
This also simplifies the interpreter in that we no longer necessarily
rely on the global interactive state to resume a thread. We can do it
directly from the ExecBreak.
The interactive context still maintains a stack of resumes, but
`resumeExec` can no longer pop the resume it resumes off of the
breakpoints stack, since it is no longer guaranteed to be resuming the
first in that list. Hence, callers of `resumeExec` must update ic_resume
on their own.
Fixes #28058
- - - - -
50 changed files:
- changelog.d/T27722-cbe-entry-block.md
- + changelog.d/caf-deadlock-27272
- + changelog.d/ghc-api-exec-break-resume
- compiler/GHC/Cmm/CallConv.hs
- compiler/GHC/Cmm/CommonBlockElim.hs
- compiler/GHC/CmmToAsm/Config.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToAsm/X86/Instr.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/CmmToLlvm/Config.hs
- compiler/GHC/Driver/Config/CmmToAsm.hs
- compiler/GHC/Driver/Config/CmmToLlvm.hs
- compiler/GHC/Driver/Config/StgToCmm.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Dump.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Platform.hs
- + compiler/GHC/Platform/CpuFeatures.hs
- compiler/GHC/Runtime/Eval.hs
- compiler/GHC/Runtime/Eval/Types.hs
- compiler/GHC/StgToCmm/Config.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/SysTools/Cpp.hs
- compiler/ghc.cabal.in
- ghc/GHCi/UI.hs
- ghc/GHCi/UI/Monad.hs
- rts/StgStdThunks.cmm
- + testsuite/tests/cmm/should_run/T27722.hs
- + testsuite/tests/cmm/should_run/T27722_cmm.cmm
- testsuite/tests/cmm/should_run/all.T
- testsuite/tests/concurrent/should_run/all.T
- testsuite/tests/count-deps/CountDepsParser.stdout
- testsuite/tests/ghc-api/exactprint/Test20239.stderr
- testsuite/tests/haddock/should_compile_flag_haddock/T17544.stderr
- testsuite/tests/haddock/should_compile_flag_haddock/T17544_kw.stderr
- testsuite/tests/haddock/should_compile_flag_haddock/T24221.stderr
- testsuite/tests/parser/should_compile/DumpParsedAst.stderr
- testsuite/tests/parser/should_compile/DumpRenamedAst.stderr
- testsuite/tests/parser/should_compile/T14189.stderr
- testsuite/tests/parser/should_compile/T15323.stderr
- testsuite/tests/parser/should_compile/T20452.stderr
- testsuite/tests/printer/T18791.stderr
- + testsuite/tests/rts/T27272.hs
- + testsuite/tests/rts/T27272_gen.py
- testsuite/tests/rts/all.T
- utils/check-exact/ExactPrint.hs
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