Lowering for OpConvert was removed for all architectures in CL#108496,
prior to the riscv64 port being upstreamed. Remove lowering of OpConvert
on riscv64, which brings it inline with all other architectures. This
results in 1,600+ instructions being removed from the riscv64 go binary.
Change-Id: Iaaf1f8b397875926604048b66ad8ac91a98c871e
Reviewed-on: https://go-review.googlesource.com/c/go/+/533335
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
As observed in https://go.dev/issue/61666#issuecomment-1739476954,
if a -run flag value matches no tests, dist test output doesn't do much
to help users notice that was what happened. It is valid and sometimes
intended¹ to match no tests, so I want to reserve failed status with
exit code 1 to the actionable outcome where at least 1 test failed.
But it seems reasonable to extend the existing "some were excluded"
mechanism of reporting partial testing to be more helpful.
In non-JSON mode, which is more likely to be used manually by humans,
print a special² last line that will hopefully be easier to notice when
matching no tests wasn't intended. Change nothing for -json mode since
that's likely used by machines and they can make sense of 0 JSON events.
The go test command already has this behavior, so this brings dist test
closer³ to it. (Slightly unfortunate duplicate maintenance for us, and
the need for the rare dist test users to learn its CLI quirks; oh well.)
¹ It might seem counter-intuitive at first: what's the point of calling
dist test and asking it to run no tests? One possible answer is that
it permits writing code capable of running N intended tests, where N
is 0 or higher. That is, it allows for 0 to not be a special case that
the caller would have no choice but handle differently.
² I initially considered making it say something like "N of M tests were
excluded", but decided to leave it alone since the current coordinator
code still has that text hardcoded and I don't want to break it. Hence
the new status that I expect only humans will see. And it seems better
this way anyway.
³ In particular, the "matched no tests" and "no tests to run" phrases
were selected precisely because they're already used in cmd/go output.
Change-Id: I6768d9932587195ae6dbc6e2c4742479e265733b
Reviewed-on: https://go-review.googlesource.com/c/go/+/532115
Reviewed-by: Austin Clements <austin@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This makes some improvements to the xorBytes assembler
implementation for PPC64 targets.
The loops to process large streams of bytes has been changed to
do 64 bytes at a time. Other changes were made to prevent
degradations in some of the common sizes like 8, 16.
The case for < 8 bytes on power10 has been modified to use
the LXVL and STXVL instructions.
Change-Id: I7477d12d5375d484af8c274443d595ccdafbda7c
Reviewed-on: https://go-review.googlesource.com/c/go/+/530877
Reviewed-by: Paul Murphy <murp@ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Jayanth Krishnamurthy <jayanth.krishnamurthy@ibm.com>
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Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Change-Id: If9089f8afd78de3e62cd575f642ff96ab69e2099
GitHub-Last-Rev: 14165018d6
GitHub-Pull-Request: golang/go#63386
Reviewed-on: https://go-review.googlesource.com/c/go/+/532895
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Jorropo <jorropo.pgm@gmail.com>
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Auto-Submit: Michael Pratt <mpratt@google.com>
Convert expand calls into a smaller number of focused
recursive rewrites, and rely on an enhanced version of
"decompose" to clean up afterwards.
Debugging information seems to emerge intact.
Change-Id: Ic46da4207e3a4da5c8e2c47b637b0e35abbe56bb
Reviewed-on: https://go-review.googlesource.com/c/go/+/507295
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
The branch taken by the bytealg.Count algorithm used to process a single
32 bytes block per loop iteration. Throughput of the algorithm can be
improved by unrolling two iterations per loop: the lack of data
dependencies between each iteration allows for better utilization of the
CPU pipeline. The improvement is most significant on medium size payloads
that fit in the L1 cache; beyond the L1 cache size, memory bandwidth is
likely the bottleneck and the change does not show any measurable
improvements.
goos: linux
goarch: amd64
pkg: bytes
cpu: Intel(R) Xeon(R) CPU @ 2.60GHz
│ old.txt │ new.txt │
│ sec/op │ sec/op vs base │
CountSingle/10 4.800n ± 0% 4.811n ± 0% +0.23% (p=0.000 n=10)
CountSingle/32 5.445n ± 0% 5.430n ± 0% ~ (p=0.085 n=10)
CountSingle/4K 81.38n ± 1% 63.12n ± 0% -22.43% (p=0.000 n=10)
CountSingle/4M 133.0µ ± 7% 130.1µ ± 4% ~ (p=0.280 n=10)
CountSingle/64M 4.079m ± 1% 4.070m ± 3% ~ (p=0.796 n=10)
geomean 1.029µ 973.3n -5.41%
│ old.txt │ new.txt │
│ B/s │ B/s vs base │
CountSingle/10 1.940Gi ± 0% 1.936Gi ± 0% -0.22% (p=0.000 n=10)
CountSingle/32 5.474Gi ± 0% 5.488Gi ± 0% ~ (p=0.075 n=10)
CountSingle/4K 46.88Gi ± 1% 60.43Gi ± 0% +28.92% (p=0.000 n=10)
CountSingle/4M 29.39Gi ± 7% 30.02Gi ± 4% ~ (p=0.280 n=10)
CountSingle/64M 15.32Gi ± 1% 15.36Gi ± 3% ~ (p=0.796 n=10)
geomean 11.75Gi 12.42Gi +5.71%
Change-Id: I1098228c726a2ee814806dcb438b7e92febf4370
Reviewed-on: https://go-review.googlesource.com/c/go/+/532457
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Like on other BSDs, use faccessat(AT_FDCWD, path, mode, AT_EACCESS)
Change-Id: I5b7649815651725ab9245aed3c8c1941ff9b7606
Reviewed-on: https://go-review.googlesource.com/c/go/+/532675
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
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Reviewed-by: Ian Lance Taylor <iant@google.com>
CL 469555 changed Compact to use append instead of bytes.Buffer.
appendCompact iterates over input src slice and performs escaping
of certain characters.
To optimize copying it does not copy characters one by one
but keeps track of the start offset of the data to copy when
it reaches next character to escape or the end of the input.
This start offset may become greater than input character offset
so copying of preceding data should check this condition.
CL 469555 removed boundary checks for copying data preceding
escaped characters and this change restores them.
Fixes https://github.com/golang/go/issues/63379
Change-Id: I5b7856239f256c67faf58834705675c0aea08cc2
GitHub-Last-Rev: 661576fb54
GitHub-Pull-Request: golang/go#63400
Reviewed-on: https://go-review.googlesource.com/c/go/+/533275
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
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Reviewed-by: Joseph Tsai <joetsai@digital-static.net>
Reviewed-by: Benny Siegert <bsiegert@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
That way we don't need to call into the runtime for every
type assertion (to an interface type).
name old time/op new time/op delta
TypeAssert-24 3.78ns ± 3% 1.00ns ± 1% -73.53% (p=0.000 n=10+8)
Change-Id: I0ba308aaf0f24a5495b4e13c814d35af0c58bfde
Reviewed-on: https://go-review.googlesource.com/c/go/+/529316
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Mostly a reorganization to make further changes easier.
This reorganization will make it easier to add a cache in front
of the runtime call.
Leave the old code alone for dynamic type assertions (aka generics).
Change-Id: Ia7dcb7aeb1f63baf93584ccd792e8e31510e8aea
Reviewed-on: https://go-review.googlesource.com/c/go/+/529196
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
It is currently slightly better to pass the whole interface to these
functions, so that we don't need to spill/restore the data word across
the function call.
I'm adding a cache in front of these calls, which means we'll no longer
need a spill/restore in the common case, so it is better to just pass
the itab word.
It also makes unifying the logic between I2I and I2I2 versions easier.
Change-Id: I3c3e9fbb1e54890482840d76a1df79f4325bb5bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/528075
Reviewed-by: Keith Randall <khr@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
That way we don't need to call into the runtime when the type being
switched on has been seen many times before.
The cache is just a hash table of a sample of all the concrete types
that have been switched on at that source location. We record the
matching case number and the resulting itab for each concrete input
type.
The caches seldom get large. The only two in a run of all.bash that
get more than 100 entries, even with the sampling rate set to 1, are
test/fixedbugs/issue29264.go, with 101
test/fixedbugs/issue29312.go, with 254
Both happen at the type switch in fmt.(*pp).handleMethods, perhaps
unsurprisingly.
name old time/op new time/op delta
SwitchInterfaceTypePredictable-24 25.8ns ± 2% 2.5ns ± 3% -90.43% (p=0.000 n=10+10)
SwitchInterfaceTypeUnpredictable-24 37.5ns ± 2% 11.2ns ± 1% -70.02% (p=0.000 n=10+10)
Change-Id: I4961ac9547b7f15b03be6f55cdcb972d176955eb
Reviewed-on: https://go-review.googlesource.com/c/go/+/526658
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@google.com>
For type switches where the targets are interface types,
call into the runtime once instead of doing a sequence
of assert* calls.
name old time/op new time/op delta
SwitchInterfaceTypePredictable-24 26.6ns ± 1% 25.8ns ± 2% -2.86% (p=0.000 n=10+10)
SwitchInterfaceTypeUnpredictable-24 39.3ns ± 1% 37.5ns ± 2% -4.57% (p=0.000 n=10+10)
Not super helpful by itself, but this code organization allows
followon CLs that add caching to the lookups.
Change-Id: I7967f85a99171faa6c2550690e311bea8b54b01c
Reviewed-on: https://go-review.googlesource.com/c/go/+/526657
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
- Un-export Convertop: it's only used by tcConv.
- Remove AssignOp1: introduced in CL 349614, only used by irgen.
- Un-export Assignop: it was exported to be used by irgen only.
Change-Id: I7e78b35d90f165c537cf32a104156bf2a13ca8b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/532516
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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The types2 typechecker already reported all invalid conversions required
by the Go language spec. However, the conversion involves go pragma is
not specified in the spec, so is not checked by types2.
Fixing this by handling the error gracefully during typecheck, just like
how old typechecker did before CL 394575.
Fixes#63333
Change-Id: I04c4121971c62d96f75ded1794ab4bdf3a6cd0ea
Reviewed-on: https://go-review.googlesource.com/c/go/+/532515
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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When the httpmuxgo121 GODEBUG setting was active, we were registering
patterns in the old and the new way. Fix to register only in the old
way.
Change-Id: Ibc1fd41e7f4d162ee5bc34575df409e1db5657cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/533095
Run-TryBot: Jonathan Amsterdam <jba@google.com>
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Reviewed-by: Damien Neil <dneil@google.com>
CallExpr.X -> CallExpr.Fun
This consistent with go/ast and cmd/compile/internal/syntax.
OPRINTN -> OPRINTLN
This op represents the "println" builtin; might as well spell it the
same way.
Change-Id: Iead1b007776658c717879cf0997b3c48028428f4
Reviewed-on: https://go-review.googlesource.com/c/go/+/532795
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
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Add a new form of RLDC which maps directly to the ISA definition
of rldc: RLDC Rs, $sh, $mb, Ra. This is used to generate mask
constants described below.
Using MOVD $-1, Rx; RLDC Rx, $sh, $mb, Rx, any mask constant
can be generated. A mask is a contiguous series of 1 bits, which
may wrap.
Change-Id: Ifcaae1114080ad58b5fdaa3e5fc9019e2051f282
Reviewed-on: https://go-review.googlesource.com/c/go/+/531120
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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Run-TryBot: Paul Murphy <murp@ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
The change that keeps on giving. Only track brace depth in tJS if we are
already inside of a template literal. If we start tracking depth outside
of nested literals it can cause the parser to think we're still in a JS
context when we've actually closed the string interp.
I believe this _mostly_ captures the expected parsing, but since the
JS parser does not implement proper lexical goal symbols, it may not
be entirely accurate. At some point in the future we may be able to
significantly reduce the complexity of this implementation by
implementing a lexical parser that more closely follows the ECMAScript
specification, and structuring escaping rules based on which symbol an
action appears in. This would also allow us to catch errors, which
we currently cannot reasonable do (although perhaps this is beyond the
scope of what html/template _should_ be doing).
Updates #61619
Change-Id: I56e1dbc0d0705ef8fb7a5454ebe2421d4e162ef6
Reviewed-on: https://go-review.googlesource.com/c/go/+/532595
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Reviewed-by: Damien Neil <dneil@google.com>
The Windows unhandled exception mechanism fails to call the callback
set in SetUnhandledExceptionFilter if the stack can't be correctly
unwound.
Some cgo glue code was not properly chaining the frame pointer, making
the stack unwind to fail in case of an exception inside a cgo call.
This CL fix that and adds a test case to avoid regressions.
Fixes#50951
Change-Id: Ic782b5257fe90b05e3def8dbf0bb8d4ed37a190b
Reviewed-on: https://go-review.googlesource.com/c/go/+/525475
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
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Check for shifted 16b constants, and transform them to avoid the load
penalty. This should be much faster than loading, and reduce binary
size by reducing the constant pool size.
Change-Id: I6834e08be7ca88e3b77449d226d08d199db84299
Reviewed-on: https://go-review.googlesource.com/c/go/+/531119
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
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As of CL 495447 we now synthesize coverage data (including coverage
profiles) for packages that have no tests, if they are included in a
"go test -cover" run. The code that set up the "run" actions for such
tests wasn't setting the objdir for the action, which meant that the
coverage profile temp file fragment ("_cover_.out") was being created
in the dir where the test was run, and in addition the same fragment
could be written to by more than one package (which could lead to a
corrupted file). This CL updates the code to properly set the objdir,
and to create the dir when needed.
Updates #24570.
Fixes#63356.
Change-Id: Iffe131cf50f07ce91085b816a039308e0ca84776
Reviewed-on: https://go-review.googlesource.com/c/go/+/532555
Reviewed-by: Russ Cox <rsc@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
A hostname without a port leaves the port implied by the protocol.
For HTTPS, the implied port is 443, not 80.
Change-Id: I873a076068f84c8041abf10a435d9499635730a0
Reviewed-on: https://go-review.googlesource.com/c/go/+/454975
Auto-Submit: Damien Neil <dneil@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
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For cgo callbacks, currently cgocallbackg locks the OS thread and
then call cgocallbackg1, which invokes the actual callback, and
then unlocks the OS thread in a deferred call. cgocallback then
continues assuming we are on the same M. This assumes there is no
preemption point between the deferred unlockOSThread and returning
to the caller (cgocallbackg). But this is not always true. E.g.
when open defer is not used (e.g. PIE or shared build mode on 386),
there is a preemption point in deferreturn after invoking the
deferred function (when it checks whether there are still defers
to run).
Instead of relying on and requiring the defer implementation has
no preemption point, we move the unlockOSThread to the caller, and
ensuring no preemption by setting incgo to true before unlocking.
This doesn't cover the panicking path, so we also adds an
unlockOSThread there. There we don't need to worry about preemption,
because we're panicking out of the callback and we have unwound the
g0 stack, instead of reentering cgo.
Fixes#62102.
Change-Id: I0e0b9f9091be88d01675c0acb7339b81402545be
Reviewed-on: https://go-review.googlesource.com/c/go/+/532615
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When printing synthetic syntax (not created by the parser),
the tree for <-((<-chan int)(nil)) without any ParenExpr nodes
was misprinted so that it was parsed back as a receive of
a receive. This changes emits parens around the channel type.
Fixes#63362
Change-Id: I2041ced224f0bca001cee5d37f7a127265d21020
Reviewed-on: https://go-review.googlesource.com/c/go/+/532556
Auto-Submit: Robert Griesemer <gri@google.com>
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Uses ,ABI instead of <ABI> because of problems with shell escaping
and windows file names, however if someone goes to all the trouble
of escaping the linker syntax and uses that instead, that works too.
Examples:
```
GOSSAFUNC=runtime.exitsyscall go build main.go
\# runtime
dumped SSA for exitsyscall,0 to ../../src/loopvar/ssa.html
dumped SSA for exitsyscall,1 to ../../src/loopvar/ssa.html
GOSSADIR=`pwd` GOSSAFUNC=runtime.exitsyscall go build main.go
\# runtime
dumped SSA for exitsyscall,0 to ../../src/loopvar/runtime.exitsyscall,0.html
dumped SSA for exitsyscall,1 to ../../src/loopvar/runtime.exitsyscall,1.html
GOSSAFUNC=runtime.exitsyscall,0 go build main.go
\# runtime
dumped SSA for exitsyscall,0 to ../../src/loopvar/ssa.html
GOSSAFUNC=runtime.exitsyscall\<1\> go build main.go
\# runtime
dumped SSA for exitsyscall,1 to ../../src/loopvar/ssa.html
```
Change-Id: Ia1138b61c797d0de49dbfae702dc306b9650a7f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/532475
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User can trust new CA on android but it seems that go build package are not able to use it.
This PR will add the folder where user CA trusted certificate is added to.
Change-Id: I9ea7801b35847ea3eb4eedd875227743ba99af00
GitHub-Last-Rev: c49ffd270b
GitHub-Pull-Request: golang/go#50240
Reviewed-on: https://go-review.googlesource.com/c/go/+/473035
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Than McIntosh <thanm@google.com>
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Reviewed-by: Roland Shoemaker <roland@golang.org>
Auto-Submit: Roland Shoemaker <roland@golang.org>
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The additional empty line was inadvertently introduced by CL 526676,
causing only part of the Time godoc to be rendered on pkg.go.dev.
Change-Id: I868315752eb160ebaab227c8b5369054c557cb7e
Reviewed-on: https://go-review.googlesource.com/c/go/+/531877
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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See the comment in the (very small) fix for a detailed description.
Use the opportunity to introduce a generic clone function which may
be useful elsewhere.
Fixes#63260.
Change-Id: Ic63c6b8bc443011b1a201908254f7d062e1aec71
Reviewed-on: https://go-review.googlesource.com/c/go/+/532157
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If there is no second parameter added during append, there will be no prompt when executing go vet. Add an analyzer to detect this situation
Update #60448
Change-Id: If9848835424f310c54e3e9377aaaad4a1516871a
Reviewed-on: https://go-review.googlesource.com/c/go/+/498416
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For constant signed values which require 34b to represent,
the assembler will generate a pli instruction on
linux/power10/PPC64 instead of loading a constant.
Similarly, ADD is extended to support 34b signed constants.
On linux/power10/PPC64, this generates a paddi instruction.
For assembler consistency, a second form is added if paddi
cannot be used. The second form is provided for assembly
writers.
Change-Id: I98144306af766b02fbbe36b72856a23cdf51d247
Reviewed-on: https://go-review.googlesource.com/c/go/+/528317
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These primitives will be used by the new And/Or sync/atomic apis.
For #61395
Change-Id: I9ad92634add0357092e49b5a4a40c177e242a0b6
GitHub-Last-Rev: cf3fb0dce6
GitHub-Pull-Request: golang/go#63294
Reviewed-on: https://go-review.googlesource.com/c/go/+/531716
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Change-Id: I679c906057577d4a795c07a2f572b969c3ee14d5
GitHub-Last-Rev: fba371d2d6
GitHub-Pull-Request: golang/go#63350
Reviewed-on: https://go-review.googlesource.com/c/go/+/532218
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This enables publicationBarrier to be used as an intrinsic
on riscv64, optimizing the required function call and return
instructions for invoking the "runtime.publicationBarrier"
function.
This function is called by mallocgc. The benchmark results for malloc tested on Lichee-Pi-4A(TH1520, RISC-V 2.0G C910 x4) are as follows.
goos: linux
goarch: riscv64
pkg: runtime
│ old.txt │ new.txt │
│ sec/op │ sec/op vs base │
Malloc8-4 92.78n ± 1% 90.77n ± 1% -2.17% (p=0.001 n=10)
Malloc16-4 156.5n ± 1% 151.7n ± 2% -3.10% (p=0.000 n=10)
MallocTypeInfo8-4 131.7n ± 1% 130.6n ± 2% ~ (p=0.165 n=10)
MallocTypeInfo16-4 186.5n ± 2% 186.2n ± 1% ~ (p=0.956 n=10)
MallocLargeStruct-4 1.345µ ± 1% 1.355µ ± 1% ~ (p=0.093 n=10)
geomean 216.9n 214.5n -1.10%
Change-Id: Ieab6c02309614bac5c1b12b5ee3311f988ff644d
Reviewed-on: https://go-review.googlesource.com/c/go/+/531719
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Change-Id: Ib6a0e1e1583e45e3d239455e8b131c81602b2d5d
GitHub-Last-Rev: dc82635562
GitHub-Pull-Request: golang/go#63200
Reviewed-on: https://go-review.googlesource.com/c/go/+/530875
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Updates #55999
Change-Id: I6e48e6649e19a9b2d776745c05eefb3995b6dd00
Reviewed-on: https://go-review.googlesource.com/c/go/+/518625
Reviewed-by: Aaron Bieber <deftly@gmail.com>
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Change-Id: I8740a2a7ebb3045d8daa97bcb0da7f31f6f7b881
Reviewed-on: https://go-review.googlesource.com/c/go/+/531996
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Reviewed-by: Ian Lance Taylor <iant@google.com>
Like on linux and freebsd, use faccessat(AT_FDCWD, path, mode, AT_EACCESS)
Change-Id: Ia76ba67023b6deba6f0cdaf30a0b9cee0c140bb8
Reviewed-on: https://go-review.googlesource.com/c/go/+/531876
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I recently reviewed some code that did time calculations using
`time.UnixMicro(0).UTC()`. I commented that because time calculations
are independent of the location, they should drop the `.UTC()`, and they
replied that it made their tests fail.
I looked into it and eventually discovered it was because they were
using AddDate. Dramatically simplified, their code did something like:
orig := time.Date(2013, time.March, 23, 12, 00, 0, 0, time.UTC)
want := time.Date(2013, time.March, 23, 0, 0, 0, 0, time.UTC)
epoch := time.UnixMicro(0)
days := int(orig.Sub(epoch).Hours() / 24)
got := epoch.AddDate(0, 0, days)
if !got.Equal(want) {
t.Errorf("ay caramba: %v vs %v", got.UTC(), want.UTC())
}
The issue is that their tests run in Pacific time, which is currently
PST (UTC-8) but was PDT (UTC-7) in January 1970.
It turns out they were implementing some business policy that really
cares abut calendar days so AddDate is correct, but it's certainly a bit
confusing!
The idea with this change is to remove the risk that readers make a
false shortcut in their mind: "Locations do not affect time
calculations". To do this we remove some text from the core time.Time
doc and shift it to the areas of the library that deal with these
intrinsically confusing operations.
Change-Id: I8200e9edef7d1cdd8516719e34814eb4b78d30a2
Reviewed-on: https://go-review.googlesource.com/c/go/+/526676
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Change-Id: I6365cdf22ad5e669908519d0ee8b78d76ae8f1b9
Reviewed-on: https://go-review.googlesource.com/c/go/+/532075
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[[ is a compound command part of the language with structure,
whereas [ is simply a standard program with string arguments.
The former has a few significant advantages over the latter:
* Better syntax, e.g. && and || rather than -a and -o,
as well as == rather than = for comparisons
* No need for fork+exec to evaluate each conditional
* Forgetting the closing token is an early parse error
The only advantage of [ over [[ is that [[ is Bash syntax,
whereas [ and "test" are portable POSIX Shell utilities.
However, this is a Bash script, so that is not a concern.
Change-Id: I8a4bdd16845bd67bf67a348d7d96d45d5b131d85
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CL 531516 converted origRlimitNofile from an atomic.Value to
atomic.Pointer[Rlimit]. i.e., it changed from storing a value to storing
a pointer.
After storing a pointer to lim, the remainder of this function
immediately modifies it, thus mutating the value pointer to by
origRlimitNofile (and thus defeating the point of origRlimitNofile).
This broke the android-amd64-emu builder because it is (apparently) the
only builder where the original RLIMIT_NOFILE Cur != Max.
TestRlimitRestored is skipped on every other builder.
Change-Id: I12076350eeddfd221823ad651e7e7eca59d2bdcd
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