I was profiling the cpu usage of go/printer's only benchmark,
and found that token.File.Unpack was one of the top offenders.
It was mainly the deferred unlock that took a big chunk of time,
and to my surprise, reoving the use of defer helped significantly:
name old time/op new time/op delta
Print-16 5.61ms ± 2% 5.38ms ± 1% -4.04% (p=0.000 n=10+8)
name old speed new speed delta
Print-16 9.27MB/s ± 2% 9.64MB/s ± 1% +4.03% (p=0.000 n=9+8)
name old alloc/op new alloc/op delta
Print-16 332kB ± 0% 332kB ± 0% ~ (p=0.363 n=10+10)
name old allocs/op new allocs/op delta
Print-16 3.45k ± 0% 3.45k ± 0% ~ (all equal)
It seems like #38471 is to blame, as the defer prevents Unlock from
being inlined. Add a TODO as a reminder to come back here once the
compiler issue is fixed.
Change-Id: I5a1c6d36a8e8357435a305a1bc0970ee0358b08a
Reviewed-on: https://go-review.googlesource.com/c/go/+/424920
Reviewed-by: Alan Donovan <adonovan@google.com>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Bryan Mills <bcmills@google.com>
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ReadData follows the error semantics of io.ReadFull for small sizes,
it should do so as well for large sizes.
Change-Id: I6a11b00d903ac5332e1dda074473790dcf21f32a
Reviewed-on: https://go-review.googlesource.com/c/go/+/424919
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
We don't have a good musl detection mechanism, so we detect Alpine (the
most common user of musl) instead.
For #39857.
For #19938.
Change-Id: I2fa39248682aed75884476374fe2212be4427347
Reviewed-on: https://go-review.googlesource.com/c/go/+/425001
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
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To avoid false positives from the reflectvaluecompare checker #43993
Use v.IsValid() instead of
var zero reflect.Value
v != zero
Also avoid comparing directly with the singleton reflect.Value
representing a missing value. Detect the missing value by type instead.
Change-Id: I3a00d63cf61c077e7c7ae816474aa1f032be325b
Reviewed-on: https://go-review.googlesource.com/c/go/+/308769
Reviewed-by: Cherry Mui <cherryyz@google.com>
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This makes it possible to use `disasm` with ASLR windows binaries.
For #46639
Change-Id: I08aff38dc0b33fdfb07e0206766db066e33207d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/416976
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Damien Neil <dneil@google.com>
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Occasionally the signal will be sent to a Go thread, which will cause
the program to exit with SIGQUIT rather than SIGSEGV.
Add TestSignalForwardingGo to test the case where the signal is
expected to be delivered to a Go thread.
This is a roll forward of CL 419014 which was rolled back in CL 424954.
This CL differs from 419014 in that it skips TestSignalForwardingGo
on darwin-amd64.
Fixes#53907
Change-Id: I5df3fd610c068df3bd48d9b3d7a9379248b97999
Reviewed-on: https://go-review.googlesource.com/c/go/+/425002
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
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Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Change-Id: Idc1f8b3fb6b4b2fdcc6dade048cc14c53715319f
Reviewed-on: https://go-review.googlesource.com/c/go/+/424197
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Avoid allocating large amounts of memory for corrupt input.
No test case because the problem can only happen for invalid data.
Let the fuzzer find cases like this.
Fixes#53787
Change-Id: I1b75a4c000b8d1112110309ec44b0ba9b4638d71
Reviewed-on: https://go-review.googlesource.com/c/go/+/416861
Auto-Submit: Ian Lance Taylor <iant@google.com>
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Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dan Kortschak <dan@kortschak.io>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Avoid allocating large amounts of memory for corrupt input.
No test case because the problem can only happen for invalid data.
Let the fuzzer find cases like this.
Fixes#52521
Change-Id: I6a046f2e28e1255cf773ce135c5bb2b967ef43e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/414234
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dan Kortschak <dan@kortschak.io>
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
This follows on CL 407176 which added this function (in both
packages). This CL makes it consistent with the Cut function,
which uses “before” and “after” in return variable names.
Change-Id: Id4345d2fe0f50bf301a880803e87bf356986b518
Reviewed-on: https://go-review.googlesource.com/c/go/+/424922
Run-TryBot: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
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Reviewed-by: Ian Lance Taylor <iant@google.com>
Depending on the implementation of the getrusage syscall/function, the
value of rusage.Maxrss may be undefined in case of an error. Thus, only
report MaxRSS in case of no error.
Change-Id: I7572ccc53c49eb460e53bded3eb41736eed8d2ed
Reviewed-on: https://go-review.googlesource.com/c/go/+/424815
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Joedian Reid <joedian@golang.org>
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Reviewed-by: Cherry Mui <cherryyz@google.com>
Use "method has no receiver" and "method has multiple receivers"
in error messages for invalid receiver counts, matching the
corresponding types2 errors.
For #54511.
Change-Id: I96fc99440d6206c74e9416069db052234baa8248
Reviewed-on: https://go-review.googlesource.com/c/go/+/424934
Reviewed-by: Alan Donovan <adonovan@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Use "middle" and "final" rather than "2nd" and "3rd" in error messages
for invalid slice expressions. This is the original compiler error
message and many tests check for this specific message.
For #54511.
Change-Id: I86eb739aa7218b7f393fab1ab402732cb9e9a1f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/424906
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Use "invalid" rather than "incomparable" in error message for map key
types that are not comparable. This is the original compiler error
message and many tests check for this specific message. The type
checker does provide an additional explanation if the reason for
the error is not obvious (e.g. for type parameters).
For #54511.
Change-Id: Idb76c48b4dfbfd66a7deac728a552e07f14e06d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/424905
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Use same approach to parsing const and var declarations
as the syntax package. Specifically, don't complain if
the first const specification in a const declaration
doesn't have a type and initialization expression. This
removes some duplicate errors when combined with the
type checker.
Adjust corresponding type checker tests accordingly.
For #54511.
Change-Id: I96702eba51dda6b581dad44577a7f93e4c02c857
Reviewed-on: https://go-review.googlesource.com/c/go/+/424904
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
Change-Id: Ia00acf248f3498d75e2451548f82d3c57cfed06f
Reviewed-on: https://go-review.googlesource.com/c/go/+/424995
Run-TryBot: Michael Pratt <mpratt@google.com>
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Reviewed-by: Michael Pratt <mpratt@google.com>
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Make spelling consistent with uses in other error messages.
Change-Id: I584cd22413842fb8bae1632ed34c8b0e7ef163cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/424902
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
All code may be generic. Remove machinery to select parsing
mode (generic vs non-generic) since the parser doesn't support
this anymore. Adjust tests to more closely match corresponding
types2 code.
Change-Id: Id2398afe64d58714974ec96656fdf67c02ff5d04
Reviewed-on: https://go-review.googlesource.com/c/go/+/424900
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
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Generics are part of the language now; there's no need anymore
to switch back to a syntax without generics. Remove the associated
machinery and adjust short tests accordingly.
Change-Id: I6b16c5c75fd9354ee87e3b9bee110f49f514565a
Reviewed-on: https://go-review.googlesource.com/c/go/+/424857
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The validity of an import path string is checked by the type checker
(and possibly other tools); it doesn't need to be done by the parser.
Remove the respective code and tests.
Also, adjust a corresponding go/types test which resolves a TODO.
For #54511.
Change-Id: Id1fc80df4e3e83be3ef123da3946ccb8f759779f
Reviewed-on: https://go-review.googlesource.com/c/go/+/424855
Run-TryBot: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
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Reviewed-by: Robert Findley <rfindley@google.com>
Since the examples tests are now identical between the two type checkers,
remove the local copy of the examples tests and (for now) use the tests
in go/types/testdata/examples instead. Eventually we may decide to move
all tests out of the type checker directories and place them in a
shared space (e.g. internal/types/testdata).
For #54511.
Change-Id: Ibd8599d09e781b2219a23114b4b2049757971181
Reviewed-on: https://go-review.googlesource.com/c/go/+/424695
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
Follow-up on CL 424674. With this change, the files in
testdata/examples are identical to the corresponding
files for types2.
For #54511.
Change-Id: Ic61c089bbf61492094e31057ad2635803f50a30d
Reviewed-on: https://go-review.googlesource.com/c/go/+/424714
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
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This was never permitted in Go but the flexibility to do so
was introduced through the generics prototype code where we
experimented with parentheses to enclose type parameters.
Restore original (pre-generics) behavior.
Fixes#51655.
Change-Id: Ia7a4b2e393e0214a70e840c8663cf4474c5c754b
Reviewed-on: https://go-review.googlesource.com/c/go/+/424694
Run-TryBot: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
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Older kernels which require the double check of the __kuser_cmpxchg
result are no longer supported as of Go 1.18 which requires at least
Linux 2.6.32.
For #45964
Change-Id: Ic3d6691bf006353ac51b9d43e742d970e3d4e961
Reviewed-on: https://go-review.googlesource.com/c/go/+/424556
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
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Reviewed-by: Cherry Mui <cherryyz@google.com>
Offsetwriter refers to the design of SectionReader and removes
the section parameter n.
Since the size of the written data is determined by the user,
we cannot know where the end offset of the original data is.
The offset of SeekEnd is not valid in Seek method.
Fixes#45899.
Change-Id: I9d9445aecfa0dd4fc5168f2f65e1e3055c201b45
Reviewed-on: https://go-review.googlesource.com/c/go/+/406776
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Joedian Reid <joedian@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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AppendRune appends the UTF-16 encoding of a rune to a []uint16.
BenchmarkEncodeValidASCII-12 24.61ns 16B 1allocs
BenchmarkEncodeValidJapaneseChars-12 18.79ns 8B 1allocs
BenchmarkAppendRuneValidASCII-12 6.826ns 0B 0allocs
BenchmarkAppendRuneValidJapaneseChars-12 3.547ns 0B 0allocs
The ASCII case is written to be inlineable.
Fixes#51896
Change-Id: I593b1029f603297ef6e80e036f2fee2a0938d38d
Reviewed-on: https://go-review.googlesource.com/c/go/+/409054
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Though it increases the execution time, the function is already quite
fast for most users, the allocation is much more important.
name old time/op new time/op delta
ByteReplacerWriteString-8 1.23µs ± 0% 2.16µs ± 1% +75.31% (p=0.000 n=10+10)
name old alloc/op new alloc/op delta
ByteReplacerWriteString-8 2.69kB ± 0% 0.00kB -100.00% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
ByteReplacerWriteString-8 1.00 ± 0% 0.00 -100.00% (p=0.000 n=10+10)
Change-Id: I6a36df5fcb8e11ef27e6c7b252aa88e869592f3c
Reviewed-on: https://go-review.googlesource.com/c/go/+/424136
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Support for Linux kernel versions requiring the fallback to CloseOnExec
was dropped from recent Go versions. The minimum Linux kernel version is
2.6.32 as of Go 1.18. The SOCK_CLOEXEC flag for the socket syscall is
supported since kernel version 2.6.27.
Follows a similar change for net.sysSocket in CL 403634.
For #45964
Change-Id: I8b6311f07c4ed7900a9af3ecb2e146c49db08665
Reviewed-on: https://go-review.googlesource.com/c/go/+/422374
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The constants for these were auto-generated from the C includes
into zerrors_linux* files quite some time ago. The generator is
currently broken, but some new flags need to be added nevertheless.
As the flags won't change and the values are the same for all
architectures, we can just define them statically (as it's already
done in the runtime package):
- remove the CLONE_* constants from zerrors_linux_*.go;
- patch mkerrors.sh to not generate CLONE_ constants
(in case it will be fixed and used in the future);
- add the constants and some comments about them to exec_linux.go,
using Linux v5.17 include/uapi/sched.h as the ultimate source.
This adds the following new flags:
- CLONE_CLEAR_SIGHAND
- CLONE_INTO_CGROUP
- CLONE_NEWCGROUP
- CLONE_NEWTIME
- CLONE_PIDFD
For #51246.
Change-Id: I0c635723926218bd403d37e113ee4d62194463a8
Reviewed-on: https://go-review.googlesource.com/c/go/+/407574
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In order to prevent false sharing of cache lines, structs are
padded with some number of bytes. These bytes are unused, serving
only to make the size of the struct a multiple of the size of the
cache line.
The current calculation of how much to pad is an overestimation,
when the struct size is already a multiple of the cache line size
without padding. For these cases, no padding is necessary, and
the size of the inner pad field should be 0. The bug is that the
pad field is sized to a whole 'nother cache line, wasting space.
Here is the current formula that can never return 0:
cpu.CacheLinePadSize - unsafe.Sizeof(myStruct{})%cpu.CacheLinePadSize
This change simply mods that calculation by cpu.CacheLinePadSize,
so that 0 will be returned instead of cpu.CacheLinePadSize.
Change-Id: I26a2b287171bf47a3b9121873b2722f728381b5e
Reviewed-on: https://go-review.googlesource.com/c/go/+/414214
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Avoid allocating large amounts of memory for corrupt input.
No test case because the problem can only happen for invalid data.
Let the fuzzer find cases like this.
Fixes#53369
Change-Id: I67c5e75bf181ad84988d6d6da12507df0e6df8e8
Reviewed-on: https://go-review.googlesource.com/c/go/+/413979
Reviewed-by: Joseph Tsai <joetsai@digital-static.net>
Run-TryBot: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Joedian Reid <joedian@golang.org>
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For #23870
Change-Id: I3bbe0f751254d1354a59a88b45e6f944c7a2fb4d
Reviewed-on: https://go-review.googlesource.com/c/go/+/417874
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Reviewed-by: Than McIntosh <thanm@google.com>
Occasionally the signal will be sent to a Go thread, which will cause
the program to exit with SIGQUIT rather than SIGSEGV.
Add TestSignalForwardingGo to test the case where the signal is
expected to be delivered to a Go thread.
Fixes#53907
Change-Id: Iaefb964c2be4a815c11c507fa89648f8a7740ba9
Reviewed-on: https://go-review.googlesource.com/c/go/+/419014
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A single dot in a search statement doesn't affect DNS lookup, so just ignore it and a syntax error.
Fixes#54124
Change-Id: Idd43bd34c5c16af50cba51f0b6e24f992eec6e57
Reviewed-on: https://go-review.googlesource.com/c/go/+/423875
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Call only initHPETTimecounter on the system stack.
Use O_CLOEXEC flag when opening the HPET device.
FreeBSD 12.3-RELEASE-p2, AMD FX-8300
paulzhol@relic:~/go/src/time % ~/gocode/bin/benchcmp old_hpet.txt new_hpet.txt
benchcmp is deprecated in favor of benchstat: https://pkg.go.dev/golang.org/x/perf/cmd/benchstat
benchmark old ns/op new ns/op delta
BenchmarkNow-8 1420 1397 -1.62%
BenchmarkNowUnixNano-8 1421 1404 -1.20%
BenchmarkNowUnixMilli-8 1423 1405 -1.26%
BenchmarkNowUnixMicro-8 1423 1404 -1.34%
Update #50947
Change-Id: I553b5427fb0b86d7e070af4516b36326bc0aaf00
Reviewed-on: https://go-review.googlesource.com/c/go/+/391856
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Unified IR is now at feature parity with the non-unified frontend.
Change-Id: I2a8cd41267a66f5eb1f425b89d18c6d501676e07
Reviewed-on: https://go-review.googlesource.com/c/go/+/422235
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Since the spec tests are now identical between the two type checkers,
remove the local copy of the spec tests and (for now) use the tests
in go/types/testdata/spec instead. Eventually we may decide to move
all tests out of the type checker directories and place them in a
shared space (e.g. internal/types/testdata).
For #54511.
Change-Id: Ibc62230553a5ff215160dcc97696b333ae9cf685
Reviewed-on: https://go-review.googlesource.com/c/go/+/424676
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
