[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 4 commits: Clarify where `f` is defined
Marge Bot (@marge-bot)
gitlab at gitlab.haskell.org
Tue Jan 24 17:42:23 UTC 2023
Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC
Commits:
05e6a2d9 by Tom Ellis at 2023-01-24T12:10:52-05:00
Clarify where `f` is defined
- - - - -
d151546e by Cheng Shao at 2023-01-24T12:11:29-05:00
CmmToC: fix CmmRegOff for 64-bit register on a 32-bit target
We used to print the offset value to a platform word sized integer.
This is incorrect when the offset is negative (e.g. output of cmm
constant folding) and the register is 64-bit but on a 32-bit target,
and may lead to incorrect runtime result (e.g. #22607).
The fix is simple: just treat it as a proper MO_Add, with the correct
width info inferred from the register itself.
Metric Increase:
T12707
T13379
T4801
T5321FD
T5321Fun
- - - - -
b2cf0ebe by Wander Hillen at 2023-01-24T12:42:16-05:00
Allow waiting for timerfd to be interrupted during rts shutdown
- - - - -
0690c24f by Ryan Scott at 2023-01-24T12:42:16-05:00
Restore Compose's Read/Show behavior to match Read1/Show1 instances
Fixes #22816.
- - - - -
8 changed files:
- compiler/GHC/CmmToC.hs
- docs/users_guide/9.8.1-notes.rst
- docs/users_guide/using-warnings.rst
- libraries/base/Data/Functor/Compose.hs
- + libraries/base/tests/T22816.hs
- + libraries/base/tests/T22816.stdout
- libraries/base/tests/all.T
- rts/posix/ticker/Pthread.c
Changes:
=====================================
compiler/GHC/CmmToC.hs
=====================================
@@ -382,8 +382,8 @@ pprExpr platform e = case e of
CmmRegOff reg 0 -> pprCastReg reg
-- CmmRegOff is an alias of MO_Add
- CmmRegOff reg i -> pprCastReg reg <> char '+' <>
- pprHexVal platform (fromIntegral i) (wordWidth platform)
+ CmmRegOff reg i -> pprExpr platform $ CmmMachOp (MO_Add w) [CmmReg reg, CmmLit $ CmmInt (toInteger i) w]
+ where w = cmmRegWidth platform reg
CmmMachOp mop args -> pprMachOpApp platform mop args
=====================================
docs/users_guide/9.8.1-notes.rst
=====================================
@@ -10,4 +10,74 @@ Compiler
~~~~~~~~
- Added a new warning :ghc-flag:`-Wterm-variable-capture` that helps to make code compatible with
- the future extension ``RequiredTypeArguments``.
\ No newline at end of file
+ the future extension ``RequiredTypeArguments``.
+=======
+
+GHCi
+~~~~
+
+
+Runtime system
+~~~~~~~~~~~~~~
+
+- On POSIX systems that support timerfd, RTS shutdown no longer has to wait for
+ the next RTS 'tick' to occur before continuing the shutdown process. See #22692.
+
+``base`` library
+~~~~~~~~~~~~~~~~
+
+
+``ghc-prim`` library
+~~~~~~~~~~~~~~~~~~~~
+
+``ghc`` library
+~~~~~~~~~~~~~~~
+
+``ghc-heap`` library
+~~~~~~~~~~~~~~~~~~~~
+
+
+Included libraries
+------------------
+
+The package database provided with this distribution also contains a number of
+packages other than GHC itself. See the changelogs provided with these packages
+for further change information.
+
+.. ghc-package-list::
+
+ libraries/array/array.cabal: Dependency of ``ghc`` library
+ libraries/base/base.cabal: Core library
+ libraries/binary/binary.cabal: Dependency of ``ghc`` library
+ libraries/bytestring/bytestring.cabal: Dependency of ``ghc`` library
+ libraries/Cabal/Cabal/Cabal.cabal: Dependency of ``ghc-pkg`` utility
+ libraries/Cabal/Cabal-syntax/Cabal-syntax.cabal: Dependency of ``ghc-pkg`` utility
+ libraries/containers/containers/containers.cabal: Dependency of ``ghc`` library
+ libraries/deepseq/deepseq.cabal: Dependency of ``ghc`` library
+ libraries/directory/directory.cabal: Dependency of ``ghc`` library
+ libraries/exceptions/exceptions.cabal: Dependency of ``ghc`` and ``haskeline`` library
+ libraries/filepath/filepath.cabal: Dependency of ``ghc`` library
+ compiler/ghc.cabal: The compiler itself
+ libraries/ghci/ghci.cabal: The REPL interface
+ libraries/ghc-boot/ghc-boot.cabal: Internal compiler library
+ libraries/ghc-boot-th/ghc-boot-th.cabal: Internal compiler library
+ libraries/ghc-compact/ghc-compact.cabal: Core library
+ libraries/ghc-heap/ghc-heap.cabal: GHC heap-walking library
+ libraries/ghc-prim/ghc-prim.cabal: Core library
+ libraries/haskeline/haskeline.cabal: Dependency of ``ghci`` executable
+ libraries/hpc/hpc.cabal: Dependency of ``hpc`` executable
+ libraries/integer-gmp/integer-gmp.cabal: Core library
+ libraries/libiserv/libiserv.cabal: Internal compiler library
+ libraries/mtl/mtl.cabal: Dependency of ``Cabal`` library
+ libraries/parsec/parsec.cabal: Dependency of ``Cabal`` library
+ libraries/pretty/pretty.cabal: Dependency of ``ghc`` library
+ libraries/process/process.cabal: Dependency of ``ghc`` library
+ libraries/stm/stm.cabal: Dependency of ``haskeline`` library
+ libraries/template-haskell/template-haskell.cabal: Core library
+ libraries/terminfo/terminfo.cabal: Dependency of ``haskeline`` library
+ libraries/text/text.cabal: Dependency of ``Cabal`` library
+ libraries/time/time.cabal: Dependency of ``ghc`` library
+ libraries/transformers/transformers.cabal: Dependency of ``ghc`` library
+ libraries/unix/unix.cabal: Dependency of ``ghc`` library
+ libraries/Win32/Win32.cabal: Dependency of ``ghc`` library
+ libraries/xhtml/xhtml.cabal: Dependency of ``haddock`` executable
=====================================
docs/users_guide/using-warnings.rst
=====================================
@@ -2057,10 +2057,13 @@ of ``-W(no-)*``.
:since: 8.4
- The option :ghc-flag:`-Wpartial-fields` warns about record fields that could
- fail when accessed via a lacking constructor. The function ``f`` below will
- fail when applied to ``Bar``, so the compiler will emit a warning at its
- definition when :ghc-flag:`-Wpartial-fields` is enabled.
+ The option :ghc-flag:`-Wpartial-fields` warns about a record field
+ `f` that is defined in some, but not all, the contructors of a
+ data type, because `f`'s record selector function may fail. For
+ exampe, the record selector function `f`, defined in the `Foo`
+ constructor record below, will fail when applied to ``Bar``, so
+ the compiler will emit a warning at its definition when
+ :ghc-flag:`-Wpartial-fields` is enabled.
The warning is suppressed if the field name begins with an underscore. ::
=====================================
libraries/base/Data/Functor/Compose.hs
=====================================
@@ -33,7 +33,7 @@ import Data.Coerce (coerce)
import Data.Data (Data)
import Data.Type.Equality (TestEquality(..), (:~:)(..))
import GHC.Generics (Generic, Generic1)
-import Text.Read ()
+import Text.Read (Read(..), ReadPrec, readListDefault, readListPrecDefault)
infixr 9 `Compose`
@@ -55,9 +55,14 @@ deriving instance Eq (f (g a)) => Eq (Compose f g a)
-- | @since 4.18.0.0
deriving instance Ord (f (g a)) => Ord (Compose f g a)
-- | @since 4.18.0.0
-deriving instance Read (f (g a)) => Read (Compose f g a)
+instance Read (f (g a)) => Read (Compose f g a) where
+ readPrec = liftReadPrecCompose readPrec
+
+ readListPrec = readListPrecDefault
+ readList = readListDefault
-- | @since 4.18.0.0
-deriving instance Show (f (g a)) => Show (Compose f g a)
+instance Show (f (g a)) => Show (Compose f g a) where
+ showsPrec = liftShowsPrecCompose showsPrec
-- Instances of lifted Prelude classes
@@ -72,8 +77,8 @@ instance (Ord1 f, Ord1 g) => Ord1 (Compose f g) where
-- | @since 4.9.0.0
instance (Read1 f, Read1 g) => Read1 (Compose f g) where
- liftReadPrec rp rl = readData $
- readUnaryWith (liftReadPrec rp' rl') "Compose" Compose
+ liftReadPrec rp rl =
+ liftReadPrecCompose (liftReadPrec rp' rl')
where
rp' = liftReadPrec rp rl
rl' = liftReadListPrec rp rl
@@ -83,12 +88,20 @@ instance (Read1 f, Read1 g) => Read1 (Compose f g) where
-- | @since 4.9.0.0
instance (Show1 f, Show1 g) => Show1 (Compose f g) where
- liftShowsPrec sp sl d (Compose x) =
- showsUnaryWith (liftShowsPrec sp' sl') "Compose" d x
+ liftShowsPrec sp sl =
+ liftShowsPrecCompose (liftShowsPrec sp' sl')
where
sp' = liftShowsPrec sp sl
sl' = liftShowList sp sl
+-- The workhorse for Compose's Read and Read1 instances.
+liftReadPrecCompose :: ReadPrec (f (g a)) -> ReadPrec (Compose f g a)
+liftReadPrecCompose rp = readData $ readUnaryWith rp "Compose" Compose
+
+-- The workhorse for Compose's Show and Show1 instances.
+liftShowsPrecCompose :: (Int -> f (g a) -> ShowS) -> Int -> Compose f g a -> ShowS
+liftShowsPrecCompose sp d (Compose x) = showsUnaryWith sp "Compose" d x
+
-- Functor instances
-- | @since 4.9.0.0
=====================================
libraries/base/tests/T22816.hs
=====================================
@@ -0,0 +1,31 @@
+module Main (main) where
+
+import Data.Functor.Classes
+import Data.Functor.Compose
+import Text.ParserCombinators.ReadP as P
+import Text.ParserCombinators.ReadPrec (ReadPrec, lift, minPrec, readPrec_to_S)
+
+readEither' :: ReadPrec a -> String -> Either String a
+readEither' rp s =
+ case [ x | (x,"") <- readPrec_to_S read' minPrec s ] of
+ [x] -> Right x
+ [] -> Left "read1: no parse"
+ _ -> Left "read1: ambiguous parse"
+ where
+ read' =
+ do x <- rp
+ lift P.skipSpaces
+ return x
+
+-- | Like 'read', but tailored to 'Read1'.
+read1 :: (Read1 f, Read a) => String -> f a
+read1 s = either errorWithoutStackTrace id (readEither' readPrec1 s)
+
+exRead, exRead1 :: Compose Maybe Maybe Int
+exRead = read "Compose Nothing"
+exRead1 = read1 "Compose Nothing"
+
+main :: IO ()
+main = do
+ putStrLn $ showsPrec 0 exRead ""
+ putStrLn $ showsPrec1 0 exRead1 ""
=====================================
libraries/base/tests/T22816.stdout
=====================================
@@ -0,0 +1,2 @@
+Compose Nothing
+Compose Nothing
=====================================
libraries/base/tests/all.T
=====================================
@@ -286,6 +286,7 @@ test('T18642',
test('T19288', exit_code(1), compile_and_run, [''])
test('T19719', normal, compile_and_run, [''])
test('T20107', extra_run_opts('+RTS -M50M'), compile_and_run, ['-package bytestring'])
+test('T22816', normal, compile_and_run, [''])
test('trace', normal, compile_and_run, [''])
test('listThreads', js_broken(22261), compile_and_run, [''])
test('inits1tails1', normal, compile_and_run, [''])
=====================================
rts/posix/ticker/Pthread.c
=====================================
@@ -43,6 +43,7 @@
#include "Proftimer.h"
#include "Schedule.h"
#include "posix/Clock.h"
+#include <sys/poll.h>
#include <time.h>
#if HAVE_SYS_TIME_H
@@ -95,28 +96,53 @@ static OSThreadId thread;
// file descriptor for the timer (Linux only)
static int timerfd = -1;
+// pipe for signaling exit
+static int pipefds[2];
+
static void *itimer_thread_func(void *_handle_tick)
{
TickProc handle_tick = _handle_tick;
uint64_t nticks;
+ ssize_t r = 0;
+ struct pollfd pollfds[2];
+
+#if USE_TIMERFD_FOR_ITIMER
+ pollfds[0].fd = pipefds[0];
+ pollfds[0].events = POLLIN;
+ pollfds[1].fd = timerfd;
+ pollfds[1].events = POLLIN;
+#endif
// Relaxed is sufficient: If we don't see that exited was set in one iteration we will
// see it next time.
TSAN_ANNOTATE_BENIGN_RACE(&exited, "itimer_thread_func");
while (!RELAXED_LOAD(&exited)) {
if (USE_TIMERFD_FOR_ITIMER) {
- ssize_t r = read(timerfd, &nticks, sizeof(nticks));
- if ((r == 0) && (errno == 0)) {
- /* r == 0 is expected only for non-blocking fd (in which case
- * errno should be EAGAIN) but we use a blocking fd.
- *
- * Due to a kernel bug (cf https://lkml.org/lkml/2019/8/16/335)
- * on some platforms we could see r == 0 and errno == 0.
- */
- IF_DEBUG(scheduler, debugBelch("read(timerfd) returned 0 with errno=0. This is a known kernel bug. We just ignore it."));
+ if (poll(pollfds, 2, -1) == -1) {
+ sysErrorBelch("Ticker: poll failed: %s", strerror(errno));
}
- else if (r != sizeof(nticks) && errno != EINTR) {
- barf("Ticker: read(timerfd) failed with %s and returned %zd", strerror(errno), r);
+
+ // We check the pipe first, even though the timerfd may also have triggered.
+ if (pollfds[0].revents & POLLIN) {
+ // the pipe is ready for reading, the only possible reason is that we're exiting
+ exited = true; // set this again to make sure even RELAXED_LOAD will read the proper value
+ // no further action needed, skip ahead to handling the final tick and then stopping
+ }
+ else if (pollfds[1].revents & POLLIN) { // the timerfd is ready for reading
+ r = read(timerfd, &nticks, sizeof(nticks)); // this should never block now
+
+ if ((r == 0) && (errno == 0)) {
+ /* r == 0 is expected only for non-blocking fd (in which case
+ * errno should be EAGAIN) but we use a blocking fd.
+ *
+ * Due to a kernel bug (cf https://lkml.org/lkml/2019/8/16/335)
+ * on some platforms we could see r == 0 and errno == 0.
+ */
+ IF_DEBUG(scheduler, debugBelch("read(timerfd) returned 0 with errno=0. This is a known kernel bug. We just ignore it."));
+ }
+ else if (r != sizeof(nticks) && errno != EINTR) {
+ barf("Ticker: read(timerfd) failed with %s and returned %zd", strerror(errno), r);
+ }
}
} else {
if (rtsSleep(itimer_interval) != 0) {
@@ -138,8 +164,10 @@ static void *itimer_thread_func(void *_handle_tick)
}
}
- if (USE_TIMERFD_FOR_ITIMER)
+ if (USE_TIMERFD_FOR_ITIMER) {
close(timerfd);
+ }
+
return NULL;
}
@@ -185,6 +213,10 @@ initTicker (Time interval, TickProc handle_tick)
if (timerfd_settime(timerfd, 0, &it, NULL)) {
barf("timerfd_settime: %s", strerror(errno));
}
+
+ if (pipe(pipefds) < 0) {
+ barf("pipe: %s", strerror(errno));
+ }
#endif
/*
@@ -237,9 +269,21 @@ exitTicker (bool wait)
// wait for ticker to terminate if necessary
if (wait) {
+#if USE_TIMERFD_FOR_ITIMER
+ // write anything to the pipe to trigger poll() in the ticker thread
+ if (write(pipefds[1], "stop", 5) < 0) {
+ sysErrorBelch("Ticker: Failed to write to pipe: %s", strerror(errno));
+ }
+#endif
if (pthread_join(thread, NULL)) {
sysErrorBelch("Ticker: Failed to join: %s", strerror(errno));
}
+#if USE_TIMERFD_FOR_ITIMER
+ // These need to happen AFTER the ticker thread has finished to prevent a race condition
+ // where the ticker thread closes the read end of the pipe before we're done writing to it.
+ close(pipefds[0]);
+ close(pipefds[1]);
+#endif
closeMutex(&mutex);
closeCondition(&start_cond);
} else {
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/5841aac8cbf3873a43cf19fb2b8821bce982c095...0690c24f51a5bf0d8dff585bf8871ea90caa4528
--
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/5841aac8cbf3873a43cf19fb2b8821bce982c095...0690c24f51a5bf0d8dff585bf8871ea90caa4528
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