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47092 Commits

Author SHA1 Message Date
Robert Griesemer
16ad1ea841 cmd/compile/internal/types2: simplify error reporting API (cleanup)
- Remove specialized errorf functions for invalid AST/argument/operation.
  Instead use prefix constants with the error message.

- Replace several calls to Checker.errorf with calls to Checker.error
  if there are no arguments to format.

- Replace a handful of %s format verbs with %v to satisfy vet check.

- Add a basic test that checks that we're not using Checker.errorf when
  we should be using Checker.error.

Change-Id: I7bc7c14f3cf774689ec8cd5782ea31b6e30dbcd6
Reviewed-on: https://go-review.googlesource.com/c/go/+/300995
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
2021-03-13 00:38:58 +00:00
Michael Schaller
7b47f9a5f2 cmd/compile: mention that -m can be increased or given multiple times
-m can be increased or it can be given up to 4 times to increase the verbosity of the printed optimization decisions: https://github.com/golang/go/search?q=LowerM

Change-Id: I0cc304385be052664fad455ff075846a3a63f298
GitHub-Last-Rev: 140f085290
GitHub-Pull-Request: golang/go#44857
Reviewed-on: https://go-review.googlesource.com/c/go/+/299709
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-03-13 00:32:00 +00:00
Dmitri Shuralyov
3eebc26700 delete favicon.ico and robots.txt
The favicon.ico and robots.txt files have been with us in the root
directory since 2009 and 2011 respectively. Back then, the Go repo
had content for the golang.org website, which could be run locally.
Since these files were at the root of the website, they were added
to the corresponding location in the GOROOT tree—at the root.

In 2018, work started on factoring out golang.org website content
and code into a new golang.org/x/website repository (issue 29206).

The favicon.ico and robots.txt files were copied to x/website repo,
but some more work needed to be done before they would be picked up
and served when golangorg was executed in module mode. That work is
done by now (CL 293413 and CL 293414).

The scope of the godoc tool has also been reduced to just serving
Go package documentation and not the website (issue 32011), so it
can provide its own favicon.ico as needed (CL 300394).

This means these two files have no more use and can be deleted.
So long and goodbye!

Change-Id: Id71bdab6317c1dc481c9d85beaaac4b4eb92d379
Reviewed-on: https://go-review.googlesource.com/c/go/+/300549
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2021-03-12 22:45:44 +00:00
Jay Conrod
86bbf4beee cmd/go: fix godoc formatting for text from 'go help install'
Fixes #44846

Change-Id: I5a12c6437a91ce59307483ffcc70e084edc32197
Reviewed-on: https://go-review.googlesource.com/c/go/+/301329
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
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2021-03-12 21:22:32 +00:00
David Chase
78052f4c4e cmd/compile: minor cleanup -- remove dead code conditional on test
It would fail now if it were turned on.

Updsates #44816.

Change-Id: I19d94f0cb2dd84271f5304c796d7c81e1e64af25
Reviewed-on: https://go-review.googlesource.com/c/go/+/301270
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
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Reviewed-by: Cherry Zhang <cherryyz@google.com>
2021-03-12 21:19:20 +00:00
David Chase
7240a18adb cmd/compile: test register ABI for method, interface, closure calls
This is enabled with a ridiculous magic name for method,
or for last input type passed, that needs to be changed
to something inutterable before actual release.

Ridiculous method name: MagicMethodNameForTestingRegisterABI
Ridiculous last (input) type name: MagicLastTypeNameForTestingRegisterABI

RLTN is tested with strings.Contains, so you can have
MagicLastTypeNameForTestingRegisterABI1
and
MagicLastTypeNameForTestingRegisterABI2
if that is helpful

Includes test test/abi/fibish2.go

Updates #44816.

Change-Id: I592a6edc71ca9bebdd1d00e24edee1ceebb3e43f
Reviewed-on: https://go-review.googlesource.com/c/go/+/299410
Trust: David Chase <drchase@google.com>
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Reviewed-by: Cherry Zhang <cherryyz@google.com>
2021-03-12 21:18:15 +00:00
Roland Shoemaker
cdd08e615a cmd/go/internal/load: always set IsImportCycle when in a cycle
When hitting an import cycle in reusePackage, and there is already
an error set, make sure IsImportCycle is set so that we don't
end up stuck in a loop.

Fixes #25830

Change-Id: Iba966aea4a637dfc34ee22782a477209ac48c9bd
Reviewed-on: https://go-review.googlesource.com/c/go/+/301289
Trust: Roland Shoemaker <roland@golang.org>
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Reviewed-by: Jay Conrod <jayconrod@google.com>
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2021-03-12 19:10:07 +00:00
Matthew Dempsky
4662029264 runtime: simplify divmagic for span calculations
It's both simpler and faster to just unconditionally do two 32-bit
multiplies rather than a bunch of branching to try to avoid them.
This is safe thanks to the tight bounds derived in [1] and verified
during mksizeclasses.go.

Benchstat results below for compilebench benchmarks on my P920. See
also [2] for micro benchmarks comparing the new functions against the
originals (as well as several basic attempts at optimizing them).

name                      old time/op       new time/op       delta
Template                        295ms ± 3%        290ms ± 1%  -1.95%  (p=0.000 n=20+20)
Unicode                         113ms ± 3%        110ms ± 2%  -2.32%  (p=0.000 n=21+17)
GoTypes                         1.78s ± 1%        1.76s ± 1%  -1.23%  (p=0.000 n=21+20)
Compiler                        119ms ± 2%        117ms ± 4%  -1.53%  (p=0.007 n=20+20)
SSA                             14.3s ± 1%        13.8s ± 1%  -3.12%  (p=0.000 n=17+20)
Flate                           173ms ± 2%        170ms ± 1%  -1.64%  (p=0.000 n=20+19)
GoParser                        278ms ± 2%        273ms ± 2%  -1.92%  (p=0.000 n=20+19)
Reflect                         686ms ± 3%        671ms ± 3%  -2.18%  (p=0.000 n=19+20)
Tar                             255ms ± 2%        248ms ± 2%  -2.90%  (p=0.000 n=20+20)
XML                             335ms ± 3%        327ms ± 2%  -2.34%  (p=0.000 n=20+20)
LinkCompiler                    799ms ± 1%        799ms ± 1%    ~     (p=0.925 n=20+20)
ExternalLinkCompiler            1.90s ± 1%        1.90s ± 0%    ~     (p=0.327 n=20+20)
LinkWithoutDebugCompiler        385ms ± 1%        386ms ± 1%    ~     (p=0.251 n=18+20)
[Geo mean]                      512ms             504ms       -1.61%

name                      old user-time/op  new user-time/op  delta
Template                        286ms ± 4%        282ms ± 4%  -1.42%  (p=0.025 n=21+20)
Unicode                         104ms ± 9%        102ms ±14%    ~     (p=0.294 n=21+20)
GoTypes                         1.75s ± 3%        1.72s ± 2%  -1.36%  (p=0.000 n=21+20)
Compiler                        109ms ±11%        108ms ± 8%    ~     (p=0.187 n=21+19)
SSA                             14.0s ± 1%        13.5s ± 2%  -3.25%  (p=0.000 n=16+20)
Flate                           166ms ± 4%        164ms ± 4%  -1.34%  (p=0.032 n=19+19)
GoParser                        268ms ± 4%        263ms ± 4%  -1.71%  (p=0.011 n=18+20)
Reflect                         666ms ± 3%        654ms ± 4%  -1.77%  (p=0.002 n=18+20)
Tar                             245ms ± 5%        236ms ± 6%  -3.34%  (p=0.000 n=20+20)
XML                             320ms ± 4%        314ms ± 3%  -2.01%  (p=0.001 n=19+18)
LinkCompiler                    744ms ± 4%        747ms ± 3%    ~     (p=0.627 n=20+19)
ExternalLinkCompiler            1.71s ± 3%        1.72s ± 2%    ~     (p=0.149 n=20+20)
LinkWithoutDebugCompiler        345ms ± 6%        342ms ± 8%    ~     (p=0.355 n=20+20)
[Geo mean]                      484ms             477ms       -1.50%

[1] Daniel Lemire, Owen Kaser, Nathan Kurz. 2019. "Faster Remainder by
Direct Computation: Applications to Compilers and Software Libraries."
https://arxiv.org/abs/1902.01961

[2] https://github.com/mdempsky/benchdivmagic

Change-Id: Ie4d214e7a908b0d979c878f2d404bd56bdf374f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/300994
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Trust: Matthew Dempsky <mdempsky@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
2021-03-12 18:02:59 +00:00
Matthew Dempsky
735647d92e runtime: add alignment info to sizeclasses.go comments
I was curious about the minimum possible alignment for each size class
and the minimum size to guarantee any particular alignment (e.g., to
know at what class size you can start assuming heap bits are byte- or
word-aligned).

Change-Id: I205b750286e8914986533c4f60712c420c3e63e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/299909
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Trust: Matthew Dempsky <mdempsky@google.com>
2021-03-12 17:41:56 +00:00
Cherry Zhang
086357e8f6 cmd/go: include default GOEXPERIMENT in build config
Currently, the build config includes GOEXPERIMENT environment
variable if it is not empty, but that doesn't take the default
value (set at make.bash/bat/rc time) into consideration. This
may cause standard library packages appearing stale, as the
build config appears changed.

This CL changes it to use cfg.GOEXPERIMENT variable, which
includes the default value (if it is not overwritten).

May fix regabi and staticlockranking builders.

Change-Id: I242f887167f8e99192010be5c1a046eb88ab0c2a
Reviewed-on: https://go-review.googlesource.com/c/go/+/301269
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
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2021-03-12 16:51:16 +00:00
Josh Bleecher Snyder
9289c12002 Revert "testing/fstest: test that ReadDirFile on a non-dir fails"
This reverts commit 1853411d83.

Reason for revert: broke plan 9 builder. fixes #44967

Change-Id: Ib89448d37f7ab8bb05dbd89ce744431d807eb4da
Reviewed-on: https://go-review.googlesource.com/c/go/+/301190
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
2021-03-12 16:00:02 +00:00
Andy Pan
e8b82789cd A+C: add new e-mail addresses for Andy Pan
Change-Id: I2be9cba124b407f27823b3a3778331b6118112cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/300470
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
2021-03-12 02:56:04 +00:00
Dan Scales
e87c4bb3ef cmd/compile: fix noder.Addr() to not call typechecker
Simple change to avoid calling the old typechecker in noder.Addr(). This
fixes cases where generic code calls a pointer method with a non-pointer
receiver.

Added test typeparam/lockable.go that now works with this change.

For lockable.go to work, also fix incorrect check to decide whether to
translate an OXDOT now or later. We should delay translating an OXDOT
until instantiation (because we don't know how embedding, etc. will
work) if the receiver has any typeparam, not just if the receiver type
is a simple typeparam. We also have to handle OXDOT for now in
IsAddressable(), until we can remove calls to the old typechecker in
(*irgen).funcBody().

Change-Id: I77ee5efcef9a8f6c7133564106a32437e36ba4bb
Reviewed-on: https://go-review.googlesource.com/c/go/+/300990
Run-TryBot: Dan Scales <danscales@google.com>
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Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-03-12 02:30:33 +00:00
Andy Pan
71330963c0 internal/poll: fix some grammar errors
Change-Id: I25a6424bce9d372fa46e8bdd856095845d3397bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/300889
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
2021-03-12 02:21:04 +00:00
fanzha02
a607408403 cmd/internal/obj/arm64: add support for op(extended register) with RSP arguments
Refer to ARM reference manual, like add(extended register) instructions,
the extension is encoded in the "option" field. If "Rd" or "Rn" is
RSP and "option" is "010" then LSL is preferred. Therefore, the instrution
"add Rm<<imm, RSP, RSP" or "add Rm<<imm RSP" is valid and can be encoded
as add(extended register) instruction.

But the current assembler can not handle like "op R1<<1, RSP, RSP"
instructions, this patch adds the support.

Because MVN(extended register) does not exist, remove it.

Add test cases.

Change-Id: I968749d75c6b93a4f297b39c73cc292e6b1035ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/284900
Trust: fannie zhang <Fannie.Zhang@arm.com>
Run-TryBot: fannie zhang <Fannie.Zhang@arm.com>
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Reviewed-by: Cherry Zhang <cherryyz@google.com>
2021-03-12 01:47:01 +00:00
Dan Scales
71a6c13164 cmd/compile: call types.CheckSize() in g.typ()
Restore code to call types.CheckSize() in g.typ(). There are certain
cases (involving maps) where we need to do CheckSize here. In general,
the old typechecker calls CheckSize() a lot, and we want to eliminate
calling it eventually, so should get do types.CheckSize() when we create
a new concrete type.

However, the test typeparams/cons.go does not work with just calling
types.CheckSize() in g.typ() (which is why I disabled the calls
originally). The reason is that g.typ() is called recursively within
types.go, so it can be called on a partially-created recursive type,
which leads to an error in CheckSize(). So, we need to call CheckSize()
only on fully-created top-level types. So, I divided typ() into typ()
and typ1(), where typ() is now the external entry point, and typ1() is
called within types.go. Now, typ() can call CheckSize() safely.

I also added in an extra condition - we do not currently need to call
CheckSize() on non-fully-instantiated types, since they will not make it
to the backend.  That could change a bit with dictionaries.

Fixes #44895

Change-Id: I783aa7d2999dd882ddbd99a7c19a6ff6ee420102
Reviewed-on: https://go-review.googlesource.com/c/go/+/300989
Run-TryBot: Dan Scales <danscales@google.com>
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Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-03-12 00:52:00 +00:00
Matthew Dempsky
7fc638d6f1 cmd: move GOEXPERIMENT knob from make.bash to cmd/go
This CL changes GOEXPERIMENT to act like other GO[CONFIG] environment
variables. Namely, that it can be set at make.bash time to provide a
default value used by the toolchain, but then can be manually set when
running either cmd/go or the individual tools (compiler, assembler,
linker).

For example, it's now possible to test rsc.io/tmp/fieldtrack by simply
running:

GOEXPERIMENT=fieldtrack go test -gcflags=-l rsc.io/tmp/fieldtrack \
  -ldflags=-k=rsc.io/tmp/fieldtrack.tracked

without needing to re-run make.bash. (-gcflags=-l is needed because
the compiler's inlining abilities have improved, so calling a function
with a for loop is no longer sufficient to suppress inlining.)

Fixes #42681.

Change-Id: I2cf8995d5d0d05f6785a2ee1d3b54b2cfb3331ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/300991
Trust: Matthew Dempsky <mdempsky@google.com>
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2021-03-11 21:43:04 +00:00
Bryan C. Mills
b3896fc331 net/http: revert change to generated file from CL 296152
This file is generated, so the fix needs to happen upstream.
The file can then be regenerated using 'go generate net/http'.

Updates #44143

Change-Id: I13a1e7677470ba84a06976e5bbe24f4ce1e7cfb2
Reviewed-on: https://go-review.googlesource.com/c/go/+/301069
Trust: Bryan C. Mills <bcmills@google.com>
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Reviewed-by: David Chase <drchase@google.com>
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2021-03-11 20:46:21 +00:00
Michael Matloob
4dd9c7cadc cmd/go: remove some fsyncs when writing files
cache.Trim, dowloadZip, rewriteVersionList, writeDiskCache all use
renameio.WriteFile to write their respective files to disk. For the
uses in cache.Trim and downloadZip, instead do of renameio.WriteFile,
do a truncate to the length of the file, then write the relevant bytes
so that a corrupt file (which would contain null bytes because of
the truncate) could be detected. For rewriteVersionList, use
lockedfile.Transform to do the write (which does a truncate as part of
the write too. writeDiskCache stays the same in this CL.

Also desete renameio methods that aren't used and remove the
renameio.WriteFile wrapper and just use renameio.WriteToFile which it
wraps.

There is a possibility of corrupt files in the cache (which was true
even before this CL) so later CLs will add facilities to clear corrupt
files in the cache.

Change-Id: I0d0bda40095e4cb898314315bf313e71650d8d25
Reviewed-on: https://go-review.googlesource.com/c/go/+/277412
Trust: Michael Matloob <matloob@golang.org>
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Reviewed-by: Jay Conrod <jayconrod@google.com>
2021-03-11 20:01:00 +00:00
Josh Bleecher Snyder
43d5f213e2 cmd/compile: optimize multi-register shifts on amd64
amd64 can shift in bits from another register instead of filling with 0/1.
This pattern is helpful when implementing 128 bit shifts or arbitrary length shifts.
In the standard library, it shows up in pure Go math/big.

Benchmarks results on amd64 with -tags=math_big_pure_go.

name                          old time/op  new time/op  delta
NonZeroShifts/1/shrVU-8       4.45ns ± 3%  4.39ns ± 1%   -1.28%  (p=0.000 n=30+27)
NonZeroShifts/1/shlVU-8       4.13ns ± 4%  4.10ns ± 2%     ~     (p=0.254 n=29+28)
NonZeroShifts/2/shrVU-8       5.55ns ± 1%  5.63ns ± 2%   +1.42%  (p=0.000 n=28+29)
NonZeroShifts/2/shlVU-8       5.70ns ± 2%  5.14ns ± 1%   -9.82%  (p=0.000 n=29+28)
NonZeroShifts/3/shrVU-8       6.79ns ± 2%  6.35ns ± 2%   -6.46%  (p=0.000 n=28+29)
NonZeroShifts/3/shlVU-8       6.69ns ± 1%  6.25ns ± 1%   -6.60%  (p=0.000 n=28+27)
NonZeroShifts/4/shrVU-8       7.79ns ± 2%  7.06ns ± 2%   -9.48%  (p=0.000 n=30+30)
NonZeroShifts/4/shlVU-8       7.82ns ± 1%  7.24ns ± 1%   -7.37%  (p=0.000 n=28+29)
NonZeroShifts/5/shrVU-8       8.90ns ± 3%  7.93ns ± 1%  -10.84%  (p=0.000 n=29+26)
NonZeroShifts/5/shlVU-8       8.68ns ± 1%  7.92ns ± 1%   -8.76%  (p=0.000 n=29+29)
NonZeroShifts/10/shrVU-8      14.4ns ± 1%  12.3ns ± 2%  -14.79%  (p=0.000 n=28+29)
NonZeroShifts/10/shlVU-8      14.1ns ± 1%  11.9ns ± 2%  -15.55%  (p=0.000 n=28+27)
NonZeroShifts/100/shrVU-8      118ns ± 1%    96ns ± 3%  -18.82%  (p=0.000 n=30+29)
NonZeroShifts/100/shlVU-8      120ns ± 2%    98ns ± 2%  -18.46%  (p=0.000 n=29+28)
NonZeroShifts/1000/shrVU-8    1.10µs ± 1%  0.88µs ± 2%  -19.63%  (p=0.000 n=29+30)
NonZeroShifts/1000/shlVU-8    1.10µs ± 2%  0.88µs ± 2%  -20.28%  (p=0.000 n=29+28)
NonZeroShifts/10000/shrVU-8   10.9µs ± 1%   8.7µs ± 1%  -19.78%  (p=0.000 n=28+27)
NonZeroShifts/10000/shlVU-8   10.9µs ± 2%   8.7µs ± 1%  -19.64%  (p=0.000 n=29+27)
NonZeroShifts/100000/shrVU-8   111µs ± 2%    90µs ± 2%  -19.39%  (p=0.000 n=28+29)
NonZeroShifts/100000/shlVU-8   113µs ± 2%    90µs ± 2%  -20.43%  (p=0.000 n=30+27)

The assembly version is still faster, unfortunately, but the gap is narrowing.
Speedup from pure Go to assembly:

name                          old time/op  new time/op  delta
NonZeroShifts/1/shrVU-8       4.39ns ± 1%  3.45ns ± 2%  -21.36%  (p=0.000 n=27+29)
NonZeroShifts/1/shlVU-8       4.10ns ± 2%  3.47ns ± 3%  -15.42%  (p=0.000 n=28+30)
NonZeroShifts/2/shrVU-8       5.63ns ± 2%  3.97ns ± 0%  -29.40%  (p=0.000 n=29+25)
NonZeroShifts/2/shlVU-8       5.14ns ± 1%  3.77ns ± 2%  -26.65%  (p=0.000 n=28+26)
NonZeroShifts/3/shrVU-8       6.35ns ± 2%  4.79ns ± 2%  -24.52%  (p=0.000 n=29+29)
NonZeroShifts/3/shlVU-8       6.25ns ± 1%  4.42ns ± 1%  -29.29%  (p=0.000 n=27+26)
NonZeroShifts/4/shrVU-8       7.06ns ± 2%  5.64ns ± 1%  -20.05%  (p=0.000 n=30+29)
NonZeroShifts/4/shlVU-8       7.24ns ± 1%  5.34ns ± 2%  -26.23%  (p=0.000 n=29+29)
NonZeroShifts/5/shrVU-8       7.93ns ± 1%  6.56ns ± 2%  -17.26%  (p=0.000 n=26+30)
NonZeroShifts/5/shlVU-8       7.92ns ± 1%  6.27ns ± 1%  -20.79%  (p=0.000 n=29+25)
NonZeroShifts/10/shrVU-8      12.3ns ± 2%  10.2ns ± 2%  -17.21%  (p=0.000 n=29+29)
NonZeroShifts/10/shlVU-8      11.9ns ± 2%  10.5ns ± 2%  -12.45%  (p=0.000 n=27+29)
NonZeroShifts/100/shrVU-8     95.9ns ± 3%  77.7ns ± 1%  -19.00%  (p=0.000 n=29+30)
NonZeroShifts/100/shlVU-8     97.5ns ± 2%  66.8ns ± 2%  -31.47%  (p=0.000 n=28+30)
NonZeroShifts/1000/shrVU-8     884ns ± 2%   705ns ± 1%  -20.17%  (p=0.000 n=30+28)
NonZeroShifts/1000/shlVU-8     880ns ± 2%   590ns ± 1%  -32.96%  (p=0.000 n=28+25)
NonZeroShifts/10000/shrVU-8   8.74µs ± 1%  7.34µs ± 3%  -15.94%  (p=0.000 n=27+30)
NonZeroShifts/10000/shlVU-8   8.73µs ± 1%  6.00µs ± 1%  -31.25%  (p=0.000 n=27+28)
NonZeroShifts/100000/shrVU-8  89.6µs ± 2%  75.5µs ± 2%  -15.80%  (p=0.000 n=29+29)
NonZeroShifts/100000/shlVU-8  89.6µs ± 2%  68.0µs ± 3%  -24.09%  (p=0.000 n=27+30)

Change-Id: I18f58d8f5513d737d9cdf09b8f9d14011ffe3958
Reviewed-on: https://go-review.googlesource.com/c/go/+/297050
Trust: Josh Bleecher Snyder <josharian@gmail.com>
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2021-03-11 19:11:46 +00:00
Josh Bleecher Snyder
b0733ba12d hash/maphash: increase the buffer size
This helps a lot for larger writes.

name            old time/op    new time/op    delta
Hash8Bytes-8      16.5ns ± 4%    16.8ns ± 2%   +1.76%  (p=0.000 n=29+30)
Hash320Bytes-8    55.0ns ± 2%    41.4ns ± 2%  -24.64%  (p=0.000 n=28+28)
Hash1K-8           190ns ± 2%     130ns ± 3%  -31.65%  (p=0.000 n=30+30)
Hash8K-8          1.57µs ± 2%    1.05µs ± 3%  -33.01%  (p=0.000 n=30+29)

name            old speed      new speed      delta
Hash8Bytes-8     485MB/s ± 4%   476MB/s ± 2%   -1.73%  (p=0.000 n=29+30)
Hash320Bytes-8  5.82GB/s ± 2%  7.72GB/s ± 3%  +32.55%  (p=0.000 n=28+29)
Hash1K-8        5.39GB/s ± 2%  7.88GB/s ± 3%  +46.32%  (p=0.000 n=30+30)
Hash8K-8        5.21GB/s ± 2%  7.77GB/s ± 3%  +49.28%  (p=0.000 n=30+29)

Updates #42710

Change-Id: Idaf4b2a8a41fc62fc16b54c9358cf2cc7009cf29
Reviewed-on: https://go-review.googlesource.com/c/go/+/278760
Trust: Josh Bleecher Snyder <josharian@gmail.com>
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2021-03-11 19:04:42 +00:00
Josh Bleecher Snyder
64d323f45a hash/maphash: optimize Write and WriteString
The existing code makes copies of every byte it hashes.
When passed a large chunk of memory, Write and WriteString
can skip the copying and initSeed for most of it.

To ensure that Write, WriteByte, and WriteString continue to
generate output that depends only on the sequence of bytes,
expand the grouping test to include WriteString and interleaved calls.
Also, make the test process a lot more data, to ensure that
Write* handled full buffers correctly.

name            old time/op    new time/op    delta
Hash8Bytes-8      17.1ns ± 3%    16.5ns ± 2%   -3.26%  (p=0.000 n=29+27)
Hash320Bytes-8    74.9ns ± 2%    58.5ns ± 2%  -21.86%  (p=0.000 n=30+29)
Hash1K-8           246ns ± 3%     195ns ± 1%  -20.82%  (p=0.000 n=29+30)
Hash8K-8          1.87µs ± 2%    1.59µs ± 2%  -15.04%  (p=0.000 n=26+30)

name            old speed      new speed      delta
Hash8Bytes-8     468MB/s ± 3%   484MB/s ± 2%   +3.36%  (p=0.000 n=29+27)
Hash320Bytes-8  4.28GB/s ± 2%  5.47GB/s ± 2%  +27.97%  (p=0.000 n=30+29)
Hash1K-8        4.17GB/s ± 3%  5.26GB/s ± 1%  +26.28%  (p=0.000 n=29+30)
Hash8K-8        4.38GB/s ± 2%  5.16GB/s ± 2%  +17.70%  (p=0.000 n=26+30)

Updates #42710

Change-Id: If3cdec1580ffb3e36fab9865e5a9d089c0a34bec
Reviewed-on: https://go-review.googlesource.com/c/go/+/278758
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2021-03-11 19:00:06 +00:00
Josh Bleecher Snyder
ae9cd1299c hash/maphash: manually inline setSeed
Provides a minor performance win.

name            old time/op    new time/op    delta
Hash8Bytes-8      16.5ns ± 2%    16.5ns ± 4%    ~     (p=0.407 n=27+29)
Hash320Bytes-8    58.5ns ± 2%    55.0ns ± 2%  -6.01%  (p=0.000 n=29+28)
Hash1K-8           195ns ± 1%     190ns ± 2%  -2.23%  (p=0.000 n=30+30)
Hash8K-8          1.59µs ± 2%    1.57µs ± 2%  -0.88%  (p=0.002 n=30+30)

name            old speed      new speed      delta
Hash8Bytes-8     484MB/s ± 2%   485MB/s ± 4%    ~     (p=0.417 n=27+29)
Hash320Bytes-8  5.47GB/s ± 2%  5.82GB/s ± 2%  +6.39%  (p=0.000 n=29+28)
Hash1K-8        5.26GB/s ± 1%  5.39GB/s ± 2%  +2.29%  (p=0.000 n=30+30)
Hash8K-8        5.16GB/s ± 2%  5.21GB/s ± 2%  +0.89%  (p=0.002 n=30+30)

Updates #42710

Change-Id: Ia0d7264b648f96099202de21c6b69a9c1776f6c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/278759
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2021-03-11 18:50:12 +00:00
Josh Bleecher Snyder
86d6678429 testing/fstest: clarify TestFS docs
The sentence starts "fsys must only contain",
which leads the reader to believe that fsys must not contain others.
The rapid reversal leads to confusion.
I had to read it several times to be sure I'd parsed it correctly.

Remove "only"; rely on the rest of the sentence to clarify.

Change-Id: I9fb7935aed4f9839344d3a00b761d20981fba864
Reviewed-on: https://go-review.googlesource.com/c/go/+/296529
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2021-03-11 18:25:50 +00:00
Josh Bleecher Snyder
1853411d83 testing/fstest: test that ReadDirFile on a non-dir fails
ReadDirFile implementations should return an error for non-directories.

Change-Id: I99888562cb6cf829017904ae8c1e8887a416c4cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/296391
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2021-03-11 18:25:41 +00:00
Josh Bleecher Snyder
bbf79793bd io/fs: clarify additional File interface docs
Emphasize ReadDirFile. It isn't really optional,
and all filesystems have at least one directory (".").

The remaining two additional interfaces are optimizations.
Call them that.

Fully qualify package package io identifiers.

Change-Id: Ibc425a5dfd27e08c2c10c353f780e4a6304cfd87
Reviewed-on: https://go-review.googlesource.com/c/go/+/296390
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2021-03-11 18:25:30 +00:00
Paul E. Murphy
0a655598e1 cmd/link: fix glink resolver generation on ppc64le
AddSymRef grows the section to fit the relocation. This was not
being accounted for. Instead, add a relocation and explicitly
populate it so we patch the desired instructions.

Change-Id: I583147e2545aea34c854f9d35ca920c57be60b90
Reviewed-on: https://go-review.googlesource.com/c/go/+/300949
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2021-03-11 17:36:20 +00:00
Michael Anthony Knyszek
f009b5b226 runtime: support register ABI for finalizers
This change modifies runfinq to properly pass arguments to finalizers in
registers via reflectcall.

For #40724.

Change-Id: I414c0eff466ef315a0eb10507994e598dd29ccb2
Reviewed-on: https://go-review.googlesource.com/c/go/+/300112
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2021-03-11 17:26:22 +00:00
Ian Lance Taylor
415ca3f1f0 test: add test that caused a gofrontend internal error
For #44383

Change-Id: I3610105dad3574e210e226d3ba80a4ba5a7eeaa6
Reviewed-on: https://go-review.googlesource.com/c/go/+/300789
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2021-03-11 17:20:58 +00:00
Matt T. Proud
0fc370c5d2 docs: clarify when APIs use context.Background.
The Go standard library retrofitted context support onto existing APIs
using context.Background and later offered variants that directly
supported user-defined context value specification. This commit makes
that behavior clear in documentation and suggests context-aware
alternatives if the user is looking for one.

An example motivation is supporting code for use in systems that expect
APIs to be cancelable for lifecycle correctness or load
shedding/management reasons, as alluded to in
https://blog.golang.org/context-and-structs.

Updates #44143

Change-Id: I2d7f954ddf9b48264d5ebc8d0007058ff9bddf14
Reviewed-on: https://go-review.googlesource.com/c/go/+/296152
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Jean de Klerk <deklerk@google.com>
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2021-03-11 16:37:38 +00:00
Jason A. Donenfeld
b8e9ec856c syscall: use runtime.KeepAlive for ProcThreadAttributeList arguments
It turns out that if you write Go pointers to Go memory, the Go compiler
must be involved so that it generates various calls to the GC in the
process. Letting Windows write Go pointers to Go memory violated this.
So, we replace that with just a boring call to runtime.KeepAlive. That's
not a great API, but this is all internal code anyway. We fix it up
more elegantly for external consumption in x/sys/windows with CL 300369.

Fixes #44900.

Change-Id: Id6599a793af9c4815f6c9387b00796923f32cb97
Reviewed-on: https://go-review.googlesource.com/c/go/+/300349
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2021-03-11 13:49:01 +00:00
Tobias Klauser
9ece63f064 crypto/rand, internal/syscall/unix: add support for getrandom syscall on solaris
The getrandom syscall is available on Solaris and Illumos, see
https://docs.oracle.com/cd/E88353_01/html/E37841/getrandom-2.html and
https://illumos.org/man/2/getrandom

Change-Id: Id1c65d6a5b2fbc80d20b43d8b32dab137ca950ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/299134
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2021-03-11 08:19:39 +00:00
Tobias Klauser
79e3ee52f4 internal/syscall/unix: unify GetRandom implementation
The implementation of GetRandom for Linux, FreeBSD and DragonflyBSD can
be shared.

Also remove GRND_INSECURE on DragonflyBSD as pointed out by Ian in the
review of CL 269999.

Change-Id: I5bf4c1bd51ddb2ad600652a57e0bc1bafa1cf40d
Reviewed-on: https://go-review.googlesource.com/c/go/+/299133
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2021-03-11 08:19:31 +00:00
fanzha02
3a3b8164fd cmd/dist: refactor test constraints for misc/cgo/testsantizers
Currently, the cmd/dist runs test cases in misc/cgo/testsantizers only
when memeory sanitizer is supported, but the tsan tests in
misc/cgo/testsanitizers do not require support for -msan option, which
makes tsan tests can not be run on some unsupported -msan option platforms.

Therefore, this patch moves the test constraints from cmd/dist to
msan_test.go, so that the tsan tests in misc/cgo/testsanitizers
can be run on any system where the C compiler supports -fsanitize=thread
option.

Change-Id: I779c92eedd0270050f1a0b1a69ecce50c3712bc9
Reviewed-on: https://go-review.googlesource.com/c/go/+/297774
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2021-03-11 05:38:13 +00:00
eric fang
68f3344fe9 cmd/compile: remove 8-byte alignment requirement of stack slot on ppc64
This CL applies CL 267999 to ppc64.

Fixes #42385

Change-Id: I6462d647d1abdf7cec99607c40ef4d1fed1941e5
Reviewed-on: https://go-review.googlesource.com/c/go/+/297770
Reviewed-by: eric fang <eric.fang@arm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
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2021-03-11 02:32:05 +00:00
Dan Scales
fdded79e6e cmd/compile: fix handling of partially inferred type arguments
In the case of partially inferred type arguments, we need to use the
IndexExpr as the key in g.info.Inferred[] rather than the CallExpr.

Added an extra fromStrings1 call in the settable.go test that tests
partially inferred type arguments. This new call uses a new concrete
type SettableString as well.

I also added another implementation fromStrings3 (derived from a go2go
tests) that typechecks but intentionally causes a panic.

Change-Id: I74d35c5a741f72f37160a96fbec939451157f392
Reviewed-on: https://go-review.googlesource.com/c/go/+/300309
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2021-03-11 00:31:14 +00:00
Paul E. Murphy
1bad3831a0 cmd/internal/obj: remove param element from ppc64 optab
This is rarely used, and is implied based on the
memory type of the operand.  This is a step towards
simplifying the MOV* pseudo opcodes on ppc64.

Similarly, remove the bogus param value from AVMULESB.

Change-Id: Ibad4d045ec6d8c5163a468b2db1dfb762ef674ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/300177
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2021-03-10 21:55:05 +00:00
Michael Pratt
aa26687e45 runtime, time: disable preemption in addtimer
The timerpMask optimization updates a mask of Ps (potentially)
containing timers in pidleget / pidleput. For correctness, it depends on
the assumption that new timers can only be added to a P's own heap.

addtimer violates this assumption if it is preempted after computing pp.
That G may then run on a different P, but adding a timer to the original
P's heap.

Avoid this by disabling preemption while pp is in use.

Other uses of doaddtimer should be OK:

* moveTimers: always moves to the current P's heap
* modtimer, cleantimers, addAdjustedTimers, runtimer: does not add net
  new timers to the heap while locked

Fixes #44868

Change-Id: I4a5d080865e854931d0a3a09a51ca36879101d72
Reviewed-on: https://go-review.googlesource.com/c/go/+/300610
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2021-03-10 21:49:24 +00:00
Bryan C. Mills
f9ed8b3f1e cmd/go/internal/mvs: factor out an incremental implementation
The new Graph type implements an incremental version of the MVS
algorithm, with requirements pushed in by the caller instead of pulled
by an internal MVS traversal.

To avoid redundancy going forward (and to ensure adequate test
coverage of the incremental implementation), the existing buildList
function is reimplemented in terms of Graph.

For #36460

Change-Id: Idd0b6ab8f17cc41d83a2a4c25a95f82e9ce1eab0
Reviewed-on: https://go-review.googlesource.com/c/go/+/244760
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2021-03-10 21:01:25 +00:00
Bryan C. Mills
2ceb79db52 cmd/go/internal/modload: make EditBuildList report whether the build list was changed
For #36460

Change-Id: I8dd6e6f998a217a4287212815ce61209df6f007f
Reviewed-on: https://go-review.googlesource.com/c/go/+/296609
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2021-03-10 21:00:52 +00:00
Bryan C. Mills
b7f0fb6d9e cmd/go/internal/modload: fuse upgrading with downgrading in EditBuildList
Previosly, EditBuildList performed an mvs.Upgrade followed by an
mvs.Downgrade, with the Downgrade building on the result of the
Upgrade. Unfortunately, that approach potentially folds in irrelevant
dependencies from the first Upgrade, which are then preserved
unnecessarily by the Downgrade (see mod_get_downup_artifact.txt).

Now, we use the initial Upgrade only to compute the maximum allowed
versions of transitive dependencies, and apply the module upgrades and
downgrades together in a single operation.

For #36460

Change-Id: I7590c137111fed4a3b06531c88d90efd49e6943a
Reviewed-on: https://go-review.googlesource.com/c/go/+/290770
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2021-03-10 21:00:16 +00:00
Jay Conrod
a1a3d33b0d cmd/go: test remote lookup of packages with leading dots in path elements
Follow-up to CL 297530.

For #43985
For #34992

Change-Id: I2cfa6c41c013e627c3464c383ca42f5c9ebe521a
Reviewed-on: https://go-review.googlesource.com/c/go/+/297634
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2021-03-10 20:52:20 +00:00
Lynn Boger
ccf9acefa8 cmd/compile/internal: improve handling of DS form offsets on ppc64x
In the ppc64 ISA DS form loads and stores are restricted to offset
fields that are a multiple of 4. This is currently handled with checks
in the rules that generate MOVDload, MOVWload, MOVDstore and
MOVDstorezero to prevent invalid instructions from getting to the
assembler.

An unhandled case was discovered which led to the search for a better
solution to this problem. Now, instead of checking the offset in the
rules, this will be detected when processing these Ops in
ssaGenValues in ppc64/ssa.go. If the offset is not valid, the address
of the symbol to be loaded or stored will be computed using the base
register + offset, and that value used in the new base register.
With the full address in the base register, the offset field can be
zero in the instruction.

Updates #44739

Change-Id: I4f3c0c469ae70a63e3add295c9b55ea0e30ef9b3
Reviewed-on: https://go-review.googlesource.com/c/go/+/299789
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2021-03-10 19:33:23 +00:00
Michael Pratt
c41bf9ee81 runtime: check partial lock ranking order
To ease readability we typically keep the partial order lists sorted by
rank. This isn't required for correctness, it just makes it (slightly)
easier to read the lists.

Currently we must notice out-of-order entries during code review, which
is an error-prone process.

Add a test to enforce ordering, and fix the errors that have crept in.
Most of the existing errors were misordered lockRankHchan or
lockRankPollDesc.

While we're here, I've moved the correctness check that the partial
ordering satisfies the total ordering from init to a test case. This
will allow us to catch these errors without even running
staticlockranking.

Change-Id: I9c11abe49ea26c556439822bb6a3183129600c3b
Reviewed-on: https://go-review.googlesource.com/c/go/+/300171
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2021-03-10 19:07:29 +00:00
KimMachineGun
5ce51ea741 flag: panic if flag name begins with - or contains =
Fixes #41792

Change-Id: I9b4aae8a899e3c3ac9532d27932d275cfb1fab48
GitHub-Last-Rev: f06b1e1767
GitHub-Pull-Request: golang/go#42737
Reviewed-on: https://go-review.googlesource.com/c/go/+/271788
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Rob Pike <r@golang.org>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Rob Pike <r@golang.org>
2021-03-10 18:33:52 +00:00
Katie Hockman
d0b79e3513 encoding/xml: prevent infinite loop while decoding
This change properly handles a TokenReader which
returns an EOF in the middle of an open XML
element.

Thanks to Sam Whited for reporting this.

Fixes CVE-2021-27918
Fixes #44913

Change-Id: Id02a3f3def4a1b415fa2d9a8e3b373eb6cb0f433
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1004594
Reviewed-by: Russ Cox <rsc@google.com>
Reviewed-by: Roland Shoemaker <bracewell@google.com>
Reviewed-by: Filippo Valsorda <valsorda@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/300391
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
2021-03-10 18:19:03 +00:00
Roland Shoemaker
cd3b4ca9f2 archive/zip: fix panic in Reader.Open
When operating on a Zip file that contains a file prefixed with "../",
Open(...) would cause a panic in toValidName when attempting to strip
the prefixed path components.

Fixes CVE-2021-27919
Fixes #44916

Change-Id: Ic755d8126cb0897e2cbbdacf572439c38dde7b35
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1004761
Reviewed-by: Filippo Valsorda <valsorda@google.com>
Reviewed-by: Russ Cox <rsc@google.com>
Reviewed-by: Katie Hockman <katiehockman@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/300489
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
2021-03-10 18:18:28 +00:00
Dan Scales
1811aeae66 cmd/compile: deal with helper generic types that add methods to T
Deal with cases like: 'type P[T any] T' (used to add methods to an
arbitrary type T), In this case, P[T] has kind types.TTYPEPARAM (as does
T itself), but requires more code to substitute than a simple TTYPEPARAM
T. See the comment near the beginning of subster.typ() in stencil.go.

Add new test absdiff.go. This test has a case for complex types (which
I've commented out) that will only work when we deal better with Go
builtins in generic functions (like real and imag).

Remove change in fmt.go for TTYPEPARAMS that is no longer needed (since
all TTYPEPARAMS have a sym) and was sometimes causing an extra prefix
when formatting method names.

Separate out the setting of a TTYPEPARAM bound, since it can reference
the TTYPEPARAM being defined, so must be done separately. Also, we don't
currently (and may not ever) need bounds after types2 typechecking.

Change-Id: Id173057e0c4563b309b95e665e9c1151ead4ba77
Reviewed-on: https://go-review.googlesource.com/c/go/+/300049
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Dan Scales <danscales@google.com>
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-03-10 17:36:55 +00:00
Rob Findley
5edab39f49 cmd/gofmt: fix const association to avoid inaccurate comment
The const parseTypeParams was grouped with printer-related consts in
gofmt.go, implicitly suggesting that it must be kept in sync with
go/format/format.go.

Change-Id: Ia65dc15c27fef2c389f963071252adee32ec6bd6
Reviewed-on: https://go-review.googlesource.com/c/go/+/300451
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-03-10 17:10:00 +00:00
Rob Findley
489231111f go/types: add missing build tag to api_go1.18_test.go
This file has a go:build comment without a corresponding +build comment.

Change-Id: Id01604242a14d8ead16ffb9aa1b45eef7706956a
Reviewed-on: https://go-review.googlesource.com/c/go/+/300450
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-03-10 17:09:54 +00:00