During package initialization, the compiler tries to optimize:
var A = "foo"
var B = A
into
var A = "foo"
var B = "foo"
so that we can statically initialize both A and B and skip emitting
dynamic initialization code to assign "B = A".
However, this isn't safe in the presence of cmd/link's -X flag, which
might overwrite an initialized string-typed variable at link time. In
particular, if cmd/link changes A's static initialization, it won't
know it also needs to change B's static initialization.
To address this, this CL disables this optimization for string-typed
variables.
Fixes#34675.
Change-Id: I1c18f3b855f6d7114aeb39f96aaaf1b452b88236
Reviewed-on: https://go-review.googlesource.com/c/go/+/198657
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
It's pointless to reach all ms via allgs, and doing so introduces a
race, since the m member of a g can change underneath it. Instead
iterate directly through the allm linked list.
Updates: #31528
Updates: #34130
Change-Id: I34b88402b44339b0a5b4cd76eafd0ce6e43e2be1
Reviewed-on: https://go-review.googlesource.com/c/go/+/198417
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This CL is a follow up for 198080.
Added a private writeTo method to the Node interface,
in order to use the same builder for printing all nodes
in the tree. Benchmark output against master:
benchmark old ns/op new ns/op delta
BenchmarkParseLarge-8 24594994 25292054 +2.83%
BenchmarkVariableString-8 117 118 +0.85%
BenchmarkListString-8 10475 3353 -67.99%
benchmark old allocs new allocs delta
BenchmarkVariableString-8 3 3 +0.00%
BenchmarkListString-8 149 31 -79.19%
benchmark old bytes new bytes delta
BenchmarkVariableString-8 72 72 +0.00%
BenchmarkListString-8 5698 1608 -71.78%
Change-Id: I2b1cf07cda65c1b80083fb99671289423700feba
Reviewed-on: https://go-review.googlesource.com/c/go/+/198278
Reviewed-by: Rob Pike <r@golang.org>
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
If a request for a PTR record returned a response with a non-PTR
answer, goLookupPTR would loop forever. Skipping non-PTR answers
guarantees progress through the DNS response.
Fixes#34660
Change-Id: I56f9d21e5342d07e7d843d253267e93a29707904
Reviewed-on: https://go-review.googlesource.com/c/go/+/198460
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Currently cgoCheckPointer is only used with one optional argument.
Using a slice for the optional arguments is quite expensive, hence
replace it with a single interface{}. This results in ~30% improvement.
When checking struct fields, they quite often end up being without
pointers. Check this before calling cgoCheckPointer, which results in
additional ~20% improvement.
Inline some p == nil checks from cgoIsGoPointer which gives
additional ~15% improvement.
All of this translates to:
name old time/op new time/op delta
CgoCall/add-int-32 46.9ns ± 1% 46.6ns ± 1% -0.75% (p=0.000 n=18+20)
CgoCall/one-pointer-32 143ns ± 1% 87ns ± 1% -38.96% (p=0.000 n=20+20)
CgoCall/eight-pointers-32 767ns ± 0% 327ns ± 1% -57.30% (p=0.000 n=18+16)
CgoCall/eight-pointers-nil-32 110ns ± 1% 89ns ± 2% -19.10% (p=0.000 n=19+19)
CgoCall/eight-pointers-array-32 5.09µs ± 1% 3.56µs ± 2% -30.09% (p=0.000 n=19+19)
CgoCall/eight-pointers-slice-32 3.92µs ± 0% 2.57µs ± 2% -34.48% (p=0.000 n=20+20)
Change-Id: I2aa9f5ae8962a9a41a7fb1db0c300893109d0d75
Reviewed-on: https://go-review.googlesource.com/c/go/+/198081
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Because errors like:
certificate has expired or is not yet valid
make it difficult to distinguish between "certificate has expired" and
"my local clock is skewed". Including our idea of the local time
makes it easier to identify the clock-skew case, and including the
violated certificate constraint saves folks the trouble of looking it
up in the target certificate.
Change-Id: I52e0e71705ee36f6afde1bb5a47b9b42ed5ead5b
GitHub-Last-Rev: db2ca4029c
GitHub-Pull-Request: golang/go#34646
Reviewed-on: https://go-review.googlesource.com/c/go/+/198046
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Add a test that causes generation of arch.ZeroRange calls of various sizes 8-136
bytes in the compiler. This is to test that ZeroRanges of various sizes actually
compile on different architectures, but is not testing runtime correctness (which
is hard to do).
Updates #34604
Change-Id: I4131eb86669bdfe8d4e36f4ae5c2a7b069abd6c4
Reviewed-on: https://go-review.googlesource.com/c/go/+/198045
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
CL 196846 implemented memory mapped output files but forgot to provide
an implementation for Msync. This rectifies that with a simple call to
FlushViewOfFile.
Change-Id: I5aebef9baf3a2a6ad54ceda096952a5d7d660bfe
Reviewed-on: https://go-review.googlesource.com/c/go/+/198418
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
TestEnvOverride sets PATH to /wibble before executing a CGI.
So customized Perl that is starting with '#!/usr/bin/env bash' will fail
because /usr/bin/env can't lookup bash.
Fixes#27790
Change-Id: I25e433061a7ff9da8c86429e934418fc15f12f90
Reviewed-on: https://go-review.googlesource.com/c/go/+/196845
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
By lazily starting the signal watch loop only on Notify,
we are able to have deadlock detection even when
"os/signal" is imported.
Thanks to Ian Lance Taylor for the solution and discussion.
With this change in, fix a runtime gorountine count test that
assumed that os/signal.init would unconditionally start the
signal watching goroutine, but alas no more.
Fixes#21576.
Change-Id: I6eecf82a887f59f2ec8897f1bcd67ca311ca42ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/101036
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
In #33848, we propose to use 'go 1.14' in the go.mod file to enable
new default behavior. That means that 'go mod init' needs to start
generating that directive by default, which requires the presence of
the updated version tag in the build environment.
Updates #33848
Change-Id: I9f3b8845fdfd843fd76de32f4b55d8f765d691de
Reviewed-on: https://go-review.googlesource.com/c/go/+/198318
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
nextNonSpace has an identical code except the call to
backup at the end.
Change-Id: Iefa5b13950007da38323a800fb6b0ce3d436254b
Reviewed-on: https://go-review.googlesource.com/c/go/+/198277
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
ADUFFCOPY and ADUFFZERO instructions weren't handled by rewriteToUseTOC.
These instructions are considered as a simple branch except with -dynlink
where they become an indirect call.
Fixes#34604
Change-Id: I16ca6a152164966fb9cbf792219a8a39aad2b53b
Reviewed-on: https://go-review.googlesource.com/c/go/+/197842
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
As mentioned in godoc, strings.Builder is more efficient for
concatenating and building strings.
Running a simple bench test on VariableNode.String() gives:
benchmark old ns/op new ns/op delta
BenchmarkParseLarge-8 25676831 24453285 -4.77%
BenchmarkVariableString-8 296 115 -61.15%
benchmark old allocs new allocs delta
BenchmarkVariableString-8 8 3 -62.50%
benchmark old bytes new bytes delta
BenchmarkVariableString-8 112 72 -35.71%
Change-Id: I13c9340080738fcad1edeed859d33ba608e4b05a
Reviewed-on: https://go-review.googlesource.com/c/go/+/198078
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
While understanding why syscall.Read is 2x slower on darwin/amd64, I found
out that, contrary to popular belief, the slowdown is not due to the migration
to use libSystem.dylib instead of direct SYSCALLs, i.e., CL 141639 (and #17490),
but due to a subtle change introduced in CL 141639.
Previously, syscall.Read used syscall.Syscall(SYS_READ), whose preamble called
runtime.entersyscall, but after CL 141639, syscall.Read changes to call
runtime.syscall_syscall instead, which in turn calls runtime.entersyscallblock
instead of runtime.entersyscall. And the entire 2x slow down can be attributed
to this change.
I think this is unnecessary as even though syscalls like Read might block, it
does not always block, so there is no need to handoff P proactively for each
Read. Additionally, we have been fine with not handing off P for each Read
prior to Go 1.12, so we probably don't need to change it. This changes restores
the pre-Go 1.12 behavior, where syscall preamble uses runtime.entersyscall,
and we rely on sysmon to take P back from g blocked in syscalls.
Change-Id: If76e97b5a7040cf1c10380a567c4f5baec3121ba
Reviewed-on: https://go-review.googlesource.com/c/go/+/197938
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The new yaml.v2 release broke the longtest builder. Update the expected
data.
Updates #28856
Change-Id: I98ec9e32e55bdb6b26b67e46dc16f34f77c2d40f
Reviewed-on: https://go-review.googlesource.com/c/go/+/198117
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Fix linking with a package having a .syso file in external link mode,
that would otherwise cause an error before executing the external
linker because it can't find symbols that are exported in the said
.syso file.
Fixes#33139
Change-Id: Id3ee737fba1c6f1e37910593dfedf9c84486d398
Reviewed-on: https://go-review.googlesource.com/c/go/+/186417
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Followup to https://golang.org/cl/197997
If you know the number of elements, you don't need append at all.
Either use append to grow, or allocate and index. Here we choose
number 2.
Change-Id: Ic58637231789640ff7b293ece04a95a8de7ccf8f
Reviewed-on: https://go-review.googlesource.com/c/go/+/198097
Reviewed-by: Ian Lance Taylor <iant@golang.org>
When comparing two T-typed values t1 and t2 using the T_eq function,
we used to generate:
pl := &t1
pr := &t2
return T_eq(pl, pr, unsafe.Sizeof(T{}))
This CL changes it to simply generate:
return T_eq(&t1, &t2, unsafe.Sizeof(T{}))
Surprisingly, this does not pass toolstash. For some reason, it seems
like SSA wasn't able to SSA-ify the pl and pr variables in all cases.
Change-Id: I111fbb068a1741fa169c9922cb8cdb6e21579aa4
Reviewed-on: https://go-review.googlesource.com/c/go/+/197601
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
walkcompare already called walkexpr on n.Left and n.Right, which in
turn calls anylit when appropriate.
Passes toolstash-check.
Change-Id: I6912ac5a42b977c04db9d85cb2e7295e275e083d
Reviewed-on: https://go-review.googlesource.com/c/go/+/197600
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
The required vars slice capacity is known so it can be specified before appending.
Change-Id: Ifa2fe97602e84198c4d01e5a1b0529f3f65f2df1
GitHub-Last-Rev: a0580df208
GitHub-Pull-Request: golang/go#34613
Reviewed-on: https://go-review.googlesource.com/c/go/+/197997
Reviewed-by: Andrew Bonventre <andybons@golang.org>
Updates #30322
This change adds the Unwrap method to NumError. NumError is the only custom error type of the strconv that has a nested exported error.
Change-Id: I8774886348880365a83f72a1d106276def27dffe
GitHub-Last-Rev: 712f3df884
GitHub-Pull-Request: golang/go#34213
Reviewed-on: https://go-review.googlesource.com/c/go/+/194563
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Update the list of expected "id" outputs in
TestGroupCleanupUserNamespace with SELinux context information as used
on CentOS.
Fixes#34547
Change-Id: I426bbe2d04e2039c87490362a1891ec3de6e36e0
Reviewed-on: https://go-review.googlesource.com/c/go/+/197841
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This allows to inline the common case in which the Source is a
rngSource. On linux/amd64 in a VM:
name old time/op new time/op delta
Read3-4 33.8ns ± 8% 18.5ns ± 8% -45.38% (p=0.000 n=10+10)
Read64-4 371ns ± 8% 70ns ± 7% -81.00% (p=0.000 n=10+10)
Read1000-4 5.33µs ± 5% 0.86µs ± 3% -83.85% (p=0.000 n=9+9)
Change-Id: Ibf47b0e9ecdfe62ffcb66d6a92f191800bdc740e
Reviewed-on: https://go-review.googlesource.com/c/go/+/191539
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The required slice capacity is already known. Thus, preallocate a slice with the correct capacity before appending to it.
Change-Id: I45ac2c5f1701caeb3dda20451d371713ae7e7365
GitHub-Last-Rev: 2bf575be65
GitHub-Pull-Request: golang/go#34602
Reviewed-on: https://go-review.googlesource.com/c/go/+/197917
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Avoid interface calls, enable inlining, and store the rngSource close to the
Mutex to exploit better memory locality.
Also add a benchmark to properly measure the threadsafe nature of globalRand.
On a linux/amd64 VM:
name old time/op new time/op delta
Int63Threadsafe-4 36.4ns ±12% 20.6ns ±11% -43.52% (p=0.000 n=30+30)
Int63ThreadsafeParallel-4 79.3ns ± 5% 56.5ns ± 5% -28.69% (p=0.000 n=29+30)
Change-Id: I6ab912c1a1e9afc7bacd8e72c82d4d50d546a510
Reviewed-on: https://go-review.googlesource.com/c/go/+/191538
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This change adds an optional "producer" section that reports the source
language and compiler version. See
https://github.com/WebAssembly/tool-conventions/blob/master/ProducersSection.md.
It also removes the now redundant "go.version" section.
Fixes#33295.
Change-Id: Ib4c80528728caf9e524fbd3f26822cbbc8b05a75
Reviewed-on: https://go-review.googlesource.com/c/go/+/196804
Run-TryBot: Richard Musiol <neelance@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Agniva De Sarker <agniva.quicksilver@gmail.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
In the GOPATH section of the 'How To Write Go Code' document, it is
mentioned two times in the span of a few lines that one can set GOPATH
to a custom workspace path. The two paragraphs say basically the same
thing, and they both link to golang.org/wiki/SettingGOPATH, so I'm
quite sure the duplication is not intentional.
This change deletes the second occurrence.
Change-Id: I16f8bb8657041a23ed272eacf9adbc5637e8e34a
Reviewed-on: https://go-review.googlesource.com/c/go/+/197839
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
CL 197817 replaced a use of n.Rlist with n.Right in a Fprintf call,
but it left the corresponding format as %.v, which broke the
TestFormats test on the longtest builder.
Since with n.Right is custom to use %v (and not %.v), replace the
format with %v.
Fixes the longtest builder.
Change-Id: Icf5bf820a936c51e633c25ada1a71a1ffb6d28c2
Reviewed-on: https://go-review.googlesource.com/c/go/+/197837
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This CL changes cmd/compile to use Node.Right instead of
Node.Rlist for OAS2FUNC/OAS2RECV/OAS2MAPR/OAS2DOTTYPE nodes.
Fixes#32293
Change-Id: I4c9d9100be2d98d15e016797f934f64d385f5faa
Reviewed-on: https://go-review.googlesource.com/c/go/+/197817
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This was missing from the original StructOf CL because I couldn't
think of a use for it. Now I can: even with types used entirely
by reflect, unexported fields can be set using UnsafeAddr.
Change-Id: I5e7e3d81d16e8817cdd69d85796ce33930ef523b
Reviewed-on: https://go-review.googlesource.com/c/go/+/85661
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
As mentioned in https://golang.org/issue/34062#issuecomment-529692313
src/cmd refers to older version of golang.org/x/tools.
Hence, not checking if multiple errors are used in the same fmt.Errorf.
Updating golang.org/x/tools version to latest in src/cmd.
Fixes#34062
Change-Id: I358dec2c3d3af2b19add766b8488b919109b81d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/196843
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
First, be consistent about declaring typ as &b.Func.Config.Types and
not &config.Types. Not particularly better, and it barely changes the
output, but we're more consistent now.
Second, remove a bit of duplication when handling the typ, auxint, and
aux variables.
Third and last, remove a stray canFail assignment; we ended up setting
that in add, not breakf, so it's not necessary to set it manually if we
don't use breakf.
Updates #33644.
Change-Id: I75999cb223a201969266fbfeae043599fa27fac5
Reviewed-on: https://go-review.googlesource.com/c/go/+/196803
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
