This change fine-tunes tracing output and adds additional
descriptions for delayed actions that were missing tracing.
Change-Id: Ib5e70e8f40ef564194cdb0e8d12c38e15388b987
Reviewed-on: https://go-review.googlesource.com/c/go/+/387919
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
This addresses a situation where Named.fromRHS is nil which
is causing validType to panic when the debug flag is set.
Change-Id: Ie1af3f4d412efc2ce2ee7707af5375ed130a1f2a
Reviewed-on: https://go-review.googlesource.com/c/go/+/393436
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
With all the unification/type-inference fixes in place now, we
should not see stack overflows anymore. Re-enable the panic if
we do overflow, so we can address those issues should they arise.
Fixes#51377.
Change-Id: Ied64435ea5936811504cb30bda1126c7d85980f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/392755
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
These fields were used for tracking the last scope/position that an
identifier was declared, so that we could report redeclaration
errors. However, redeclaration errors are now diagnosed by types2 (and
typecheck.Redeclared was removed in CL 388537), so these fields can be
safely pruned.
Updates #51691.
Change-Id: Ifd5ea3f6795fadb420913298d59287c95e4669a1
Reviewed-on: https://go-review.googlesource.com/c/go/+/394276
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
While building Go from source, workspace mode should be disabled,
even if the external environment tries to configure it otherwise.
Fixes#51558.
Change-Id: Icd7577860271f59a8f94406214b111280e4b65b5
Reviewed-on: https://go-review.googlesource.com/c/go/+/393879
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
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Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
The ELF compression header(Chdr) has Addralign field that is set to the
alignment of the uncompressed section which makes section able to have
a different alignment than the decompressed section. However `file` and
other tools require both Chdr.Addralign and Addralign to be equal.
Ref https://sourceware.org/bugzilla/show_bug.cgi?id=23919
Related #42136Fixes#51769
Change-Id: I3cf99dbd2359932576420a3c0d342c7e91b99227
Reviewed-on: https://go-review.googlesource.com/c/go/+/393916
Trust: mzh <mzh@golangcn.org>
Reviewed-by: Alessandro Arzilli <alessandro.arzilli@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Fangrui Song <maskray@google.com>
In last cycle we developed register ABI for ARM64, enabled by
default as a GOEXPERIMENT. This cycle we turn it on all the time.
Later CLs will clean up fallback code.
Change-Id: Idac4dcff634791cbc3d30988052ecd742b55ab8b
Reviewed-on: https://go-review.googlesource.com/c/go/+/394214
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
To pick up CL 394234.
Done by
go get -d golang.org/x/tools@c717623e3197
go mod tidy
go mod vendor
Change-Id: Ic67a7deb9a22b2679eec895210168f698d8d05eb
Reviewed-on: https://go-review.googlesource.com/c/go/+/394275
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Than McIntosh <thanm@google.com>
CL 342350 fixed deadcode panic with dead hidden closures. However, a
closure may contains nested dead hidden closures, so we need to mark
them dead as well.
Fixes#51839
Change-Id: Ib54581adfc1bdea60e74d733cd30fd8e783da983
Reviewed-on: https://go-review.googlesource.com/c/go/+/394079
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Reviewed-by: Cherry Mui <cherryyz@google.com>
Tweak the (*Data).parseUnits method to check a bit more carefully for
buffer read errors, so as to avoid infinite looping on malformed
inputs.
Fixes#51758.
Updates #47653.
Change-Id: I6d67fcb53392acf651ceec636789ab9e49ad5a5c
Reviewed-on: https://go-review.googlesource.com/c/go/+/393874
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
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When developing register ABI, for early testing the compiler
recognized a few magic names to trigger enabling register ABI.
After the development it is disabled (changed to a name that
cannot be spelled in the source code). Later in the development of
register ABI for ARM64 and PPC64, I don't think the magic names
were used. I think they can now be removed.
Keep the magic pragma for now in case it helps development.
Change-Id: Icbc34e2786a80fd8fffe4a464c569dc03a54cd09
Reviewed-on: https://go-review.googlesource.com/c/go/+/393877
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
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Reviewed-by: David Chase <drchase@google.com>
CL 372774 is for reflect, this CL is for internal/reflectlite.
Updates #50208
Change-Id: Ib7e8b1bc031feab218d1addd78388fcfe9b675b5
Reviewed-on: https://go-review.googlesource.com/c/go/+/393918
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Trust: Daniel Martí <mvdan@mvdan.cc>
This CL adds some initial support for spilling and reloading
registers in the new ABI for RISCV64.
Change-Id: I5e2b4d93c33c528809d569e5a442bb302074be78
Reviewed-on: https://go-review.googlesource.com/c/go/+/360215
Reviewed-by: Cherry Mui <cherryyz@google.com>
Trust: mzh <mzh@golangcn.org>
Run-TryBot: mzh <mzh@golangcn.org>
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CL 392918 changed n.Diag() to always return false, we can now get rid
of all its deadcode paths.
Updates #51691
Change-Id: I64c07970493e7bdcf89df9508ce88132ef4aa4d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/393915
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
CL 392918 changed t.Broke() to always return false, we can now get rid
of all its deadcode paths.
Updates #51691
Change-Id: I0a2a13def07364e780e4785621690452948e219a
Reviewed-on: https://go-review.googlesource.com/c/go/+/393914
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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The -trimpath flag has a strong effect on the resulting binary:
in particular, it determines whether runtime.GOROOT can report
a meaningful path in the absence of an explicit GOROOT environment variable.
For #51461
Change-Id: Id0d55572c0a0a4e2e4724363ed80dfa05b202186
Reviewed-on: https://go-review.googlesource.com/c/go/+/391810
Trust: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Also update cmd/dist to avoid setting gcflags and ldflags explicitly
when the set of flags to be set is empty (a verbose way of specifying
the default behavior).
Stamping was disabled for the Go standard library in CL 356014 due to
the cmd/dist flags causing cmd/go to (correctly) report the resulting
binaries as stale.
With cmd/dist fixed, we can also remove the special case in cmd/go,
which will allow tests of binaries in 'cmd' to read the build info
embedded in the test binary. That build info may be useful to
determine (say) whether runtime.GOROOT ought to work without GOROOT
set in the environment.
For #51483
Updates #37475
Change-Id: I64d04f5990190094eb6c0522db829d3bdfa50ef3
Reviewed-on: https://go-review.googlesource.com/c/go/+/391809
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
This fixes a build failure due to inability to locate the "vet" tool
when the test binary is built with -trimpath.
Updates #51461
Change-Id: I81838cc8842e4ff7900cab81af60501ebba86ff1
Reviewed-on: https://go-review.googlesource.com/c/go/+/391808
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Previously, we called path.Clean on the value of runtime.GOROOT() even
if it was empty, which would set it explicitly to ".".
That would cause (*Context).importGo to assume that errors resolving
paths in GOROOT are fatal and return early:
https://cs.opensource.google/go/go/+/master:src/go/build/build.go;l=1121-1127;drc=38174b3a3514629b84dcd76878b2f536b189dd7b
If we instead leave it empty (and are in module mode), then importGo
will fall back to letting the 'go' command resolve the path, which may
succeed if the 'go' command can infer the correct GOROOT (from its own
stamped-in default GOROOT or executable path).
Fixes#51483
Change-Id: I44dce7cec6c3d1c86670e629ddfbca8be461130c
Reviewed-on: https://go-review.googlesource.com/c/go/+/391805
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
This fixes many (but not all) of the tests that currently fail
(due to a bogus path reported by runtime.GOROOT) when run with
'go test -trimpath std cmd'.
Updates #51461
Change-Id: Ia2cc05705529c4859e7928f32eeceed647f2e986
Reviewed-on: https://go-review.googlesource.com/c/go/+/391806
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Previously, runtime.GOROOT() would return the string "go" in a binary
build with -trimpath. This change stamps the empty string instead,
using a sentinel value passed from cmd/go that looks like the GOROOT
environment variable (either "$GOROOT" or "%GOROOT%", depending on the
platform).
Fixes#51461
Change-Id: I1f10ef2435016a7b6213bd8c547df911f7feeae7
Reviewed-on: https://go-review.googlesource.com/c/go/+/390024
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
In the beginning the Go compiler was in C, and C had a function
'getgoroot' that returned GOROOT from either the environment or a
generated constant. 'getgoroot' was mechanically converted to Go
(as obj.Getgoroot) in CL 3046.
obj.Getgoroot begat obj.GOROOT. obj.GOROOT begat objabi.GOROOT,
which begat buildcfg.GOROOT.
As far as I can tell, today's buildcfg.GOROOT is functionally
identical to runtime.GOROOT(). Let's reduce some complexity by
defining it in those terms.
While we're thinking about buildcfg.GOROOT, also check whether it is
non-empty: if the toolchain is built with -trimpath, the value of
GOROOT might not be valid or meaningful if the user invokes
cmd/compile or cmd/link directly, or via a build tool other than
cmd/go that doesn't care as much about GOROOT. (As of CL 390024,
runtime.GOROOT will return the empty string instead of a bogus one
when built with -trimpath.)
For #51461.
Change-Id: I9fec020d5fa65d4aff0dd39b805f5ca93f86c36e
Reviewed-on: https://go-review.googlesource.com/c/go/+/393155
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Invoking a VCS tool requires that the VCS tool be installed, and also
adds latency to build commands. Unfortunately, we had been mistakenly
loading VCS metadata for tests of "main" packages.
Users almost never care about versioning for test binaries, because
'go test' runs the test in the source tree and test binaries are only
rarely used outside of 'go test'. So the user already knows exactly
which version the test is built against, because the source code is
right there — it's not worth the overhead to stamp.
Fixes#51723.
Change-Id: I96f191c5a765f5183e5e10b6dfb75a0381c99814
Reviewed-on: https://go-review.googlesource.com/c/go/+/393894
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Trust: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gopher Robot <gobot@golang.org>
When the test binary is built with the -trimpath flag,
runtime.GOROOT() is invalid, and must not be used to locate
GOROOT/lib/time/zoneinfo.zip. (We can use other sources instead.)
However, the test for the package expects zoneinfo.zip to definitely
exist. 'go test' runs the test binary in the directory containing its
source code — in this case GOROOT/src/time — so we can use that
information to find the zoneinfo.zip file when runtime.GOROOT isn't
available.
For #51483
Change-Id: I9de35252a988d146b5d746794323214d400e64e5
Reviewed-on: https://go-review.googlesource.com/c/go/+/391814
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
For #51698
Change-Id: Ifc5bef2cc41b163644ac80ace7c1470c8a130467
Reviewed-on: https://go-review.googlesource.com/c/go/+/393700
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Eli Bendersky <eliben@golang.org>
They should not share a shape with regular pointers. We could coalesce
multiple pointer-to-not-in-heap types, but doesn't seem worth it - just
make them fully stenciled.
Fixes#51733
Change-Id: Ie8158177226fbc46a798e71c51897a82f15153df
Reviewed-on: https://go-review.googlesource.com/c/go/+/393895
Trust: Keith Randall <khr@golang.org>
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Reviewed-by: David Chase <drchase@google.com>
go get github.com/google/pprof@latest
go mod vendor
Plus a tiny change to the pprof command to match an upstream interface
change.
Updates #36905.
Change-Id: I4c7bbe8c317a6eeb217fce971b208f96ab0727fa
Reviewed-on: https://go-review.googlesource.com/c/go/+/393370
Trust: Heschi Kreinick <heschi@google.com>
Run-TryBot: Heschi Kreinick <heschi@google.com>
Auto-Submit: Heschi Kreinick <heschi@google.com>
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Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
mkalldocs.sh runs gofmt on the output, but the test does not.
If go help documentation and gofmt disagree, the test will fail.
Fix that.
Change-Id: I837374a2d36cb5d71278ecefe2a7b6544622c576
Reviewed-on: https://go-review.googlesource.com/c/go/+/384256
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
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This is an in-process (non-exec'ing) replacement for cmd/internal/diff.
It uses an O(n log n) algorithm instead of the O(n²) algorithm
in standard diff binaries. It does not produce the absolute
shortest diffs, but the results are often more meaningful
than the standard diff, because it doesn't try to align
random blank lines or other noise.
Adding so that tests inside std (especially go/printer)
can print diffs.
Replacing cmd/internal/diff because we don't need two.
Change-Id: I9155dd925e4a813f5bfa84a8ad3dec8ffdbf8550
Reviewed-on: https://go-review.googlesource.com/c/go/+/384255
Trust: Russ Cox <rsc@golang.org>
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Reviewed-by: Peter Weinberger <pjw@google.com>
Trust: Peter Weinberger <pjw@google.com>
In last cycle we developed register ABI for ARM64, enabled by
default as a GOEXPERIMENT. This cycle we turn it on all the time.
Later CLs will clean up fallback code.
To support in-development platforms (e.g. RISC-V), separate the
boolean variables for in-development platforms and always-on
platforms.
Change-Id: I97c27f6aeccc85ccc57eed2abd783b176da3ad80
Reviewed-on: https://go-review.googlesource.com/c/go/+/393364
Trust: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
cmd/go/internal/cfg duplicates many of the fields of
internal/buildcfg, but initializes them from a Go environment file in
addition to the usual process environment.
internal/buildcfg doesn't (and shouldn't) know or care about that
environment file, but prior to this CL it exposed hooks for
cmd/go/internal/cfg to write data back to internal/buildcfg to
incorporate information from the file. It also produced quirky
GOEXPERIMENT strings when a non-trivial default was overridden,
seemingly so that 'go env' would produce those same quirky strings in
edge-cases where they are needed.
This change reverses that information flow: internal/buildcfg now
exports a structured type with methods — instead of top-level
functions communicating through global state — so that cmd/go can
utilize its marshaling and unmarshaling functionality without also
needing to write results back into buildcfg package state.
The quirks specific to 'go env' have been eliminated by distinguishing
between the raw GOEXPERIMENT value set by the user (which is what we
should report from 'go env') and the cleaned, canonical equivalent
(which is what we should use in the build cache key).
For #51461.
Change-Id: I4ef5b7c58b1fb3468497649a6d2fb6c19aa06c70
Reviewed-on: https://go-review.googlesource.com/c/go/+/393574
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
With the previous CL, internal/abi.IntArgRegs and FloatArgRegs
is controlled by RegabiArgs (or always enabled), so there is no
need to check for that goexperiment.
There are a few places we guard register-ABI specific code and
tests with the RegabiArgs flag. Switch to checking for the number
of argument registers instead.
Change-Id: I79fff9fd1e919684ffaf73aba9e7e85d5a9e1629
Reviewed-on: https://go-review.googlesource.com/c/go/+/393363
Trust: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
regabireflect goexperiment was helpful in the register ABI
development, to control code paths for reflect calls, before the
compiler can generate register ABI everywhere. It is not necessary
for now. Drop it.
Change-Id: I2731197d2f496e29616c426a01045c9b685946a4
Reviewed-on: https://go-review.googlesource.com/c/go/+/393362
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
Add my current public email in both A+C, but keep old one too.
Add my @changkun.de email to CONTRIBUTORS.
Change-Id: Ic5a585582a5f5142fbdd0a132235c19f05d9e680
Reviewed-on: https://go-review.googlesource.com/c/go/+/367116
Run-TryBot: Changkun Ou <mail@changkun.de>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ben Shi <powerman1st@163.com>
Fixes#51602. Previous test would not run in a pseudo-console (ConPTY).
New test avoids taskkill entirely by having the child request its own
console window be closed.
Verified that this runs locally (within a real console), over SSH
(within a pseudo-console), and that it breaks if #41884 were reverted.
Change-Id: If868b92ec36647e5d0e4107e29a2a6e048d35ced
GitHub-Last-Rev: b1421e4bed
GitHub-Pull-Request: golang/go#51681
Reviewed-on: https://go-review.googlesource.com/c/go/+/392874
Reviewed-by: Bryan Mills <bcmills@google.com>
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
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Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
TestDirentRepeat fails on FreeBSD 11, but seems to pass on newer
versions. Go 1.18 is the last release to support FreeBSD 11 per
https://golang.org/doc/go1.18#freebsd and there are no FreeBSD 11
builders anymore. Thus unskip TestDirentRepeat to verify the issue is
indeed fixed on FreeBSD 12 and later.
For #31416
Change-Id: I189ef06719ff830ffe2e402c74a75874c9e5b97b
Reviewed-on: https://go-review.googlesource.com/c/go/+/393618
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
pthread_attr_init on freebsd properly initializes the pthread_attr,
there is no need to zero it before the call. The comment and code were
probably copied from the linux/arm implementation.
This aligns the implementation on freebsd/arm with the implementation on
other freebsd architectures.
Fixes#44248
Change-Id: If82ebb115b877b6c6f4862018a9419ba8d870f12
Reviewed-on: https://go-review.googlesource.com/c/go/+/393617
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Hajime Hoshi <hajimehoshi@gmail.com>
Trust: Hajime Hoshi <hajimehoshi@gmail.com>
Use bytealg.IndexByteString in UTF16FromString instead of an open-coded
loop.
Change-Id: I366448382f2d0adeca6b254131e0087a1f489258
Reviewed-on: https://go-review.googlesource.com/c/go/+/393614
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Change-Id: Ide2567dc66e55880b938b5814879f012c88159b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/393697
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Matt Layher <mdlayher@gmail.com>
