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Commit Graph

52459 Commits

Author SHA1 Message Date
Archana R
5c707f5f3a internal/bytealg: optimize indexbyte function for ppc64le/power9
Added specific code For POWER9 that does not need prealignment prior
to load vector. Optimized vector loop to jump out as soon as there is
a match instead of accumulating matches for 4 indices and then processing
the same. For small input size 10, the caller function dominates
performance.

name                      old time/op    new time/op    delta
IndexByte/10                9.20ns ± 0%   10.40ns ± 0%  +13.08%
IndexByte/32                9.77ns ± 0%    9.20ns ± 0%   -5.84%
IndexByte/4K                 171ns ± 0%     136ns ± 0%  -20.51%
IndexByte/4M                 154µs ± 0%     126µs ± 0%  -17.92%
IndexByte/64M               2.48ms ± 0%    2.03ms ± 0%  -18.27%
IndexAnyASCII/1:32          10.2ns ± 1%     9.2ns ± 0%   -9.19%
IndexAnyASCII/1:64          11.3ns ± 0%    10.1ns ± 0%  -11.29%
IndexAnyUTF8/1:64           11.4ns ± 0%     9.8ns ± 0%  -13.73%
IndexAnyUTF8/16:64           156ns ± 1%     131ns ± 0%  -16.23%
IndexAnyUTF8/256:64         2.27µs ± 0%    1.86µs ± 0%  -18.03%
LastIndexAnyUTF8/1:64       11.8ns ± 0%    10.5ns ± 0%  -10.81%
LastIndexAnyUTF8/16:64       165ns ±11%     132ns ± 0%  -19.75%
LastIndexAnyUTF8/256:2      1.68µs ± 0%    1.44µs ± 0%  -14.33%
LastIndexAnyUTF8/256:4      1.68µs ± 0%    1.49µs ± 0%  -11.10%
LastIndexAnyUTF8/256:8      1.68µs ± 0%    1.50µs ± 0%  -11.05%
LastIndexAnyUTF8/256:64     2.30µs ± 0%    1.90µs ± 0%  -17.56%
Change-Id: I3d2550bdfdea38fece2da9960bbe62fe6cb1840c
Reviewed-on: https://go-review.googlesource.com/c/go/+/397614
Reviewed-by: Paul Murphy <murp@ibm.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Archana Ravindar <aravind5@in.ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2022-04-15 16:05:09 +00:00
Bobby Powers
2c73f5f32f net/http: remove cloneURL call in WithContext
Fixes #52239

Change-Id: I08b75e613e3c976855e39d01a6757d94e4207bf8
Reviewed-on: https://go-review.googlesource.com/c/go/+/399155
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Damien Neil <dneil@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
2022-04-15 15:57:52 +00:00
Joe Tsai
35a92f92bd encoding/binary: add AppendVarint AppendUvarint
This adds a straight-forward implementation of the functionality.
A more performant version could be added that unrolls the loop
as is done in google.golang.org/protobuf/encoding/protowire,
but usages that demand high performance can use that package instead.

Fixes #51644

Change-Id: I9d3b615a60cdff47e5200e7e5d2276adf4c93783
Reviewed-on: https://go-review.googlesource.com/c/go/+/400176
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
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2022-04-15 01:19:37 +00:00
hopehook
5a4f0b6f1e runtime: don't discard value from panic while panicking
In issue #17671, there are a endless loop if printing
the panic value panics, CL 30358 has fixed that.

As issue #52257 pointed out, above change should not
discard the value from panic while panicking.

With this CL, when we recover from a panic in error.Error()
or stringer.String(), and the recovered value is string,
then we can print it normally.

Fixes #52257

Change-Id: Icfcc4a1a390635de405eea04904b4607ae9e3055
Reviewed-on: https://go-review.googlesource.com/c/go/+/399874
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
2022-04-15 01:08:38 +00:00
Keith Randall
78bea702cd cmd/compile: turn jump tables off with -N
The noopt builder is broken, because with -N we get two OpSB opcodes
(one for the function as a whole, one introduced by the jumptable
rewrite rule), and they fight each other for a register.

Without -N, the two OpSB get CSEd, so optimized builds are ok.

Maybe we fix regalloc to deal with this case, but it's simpler
(and maybe more correct?) to disable jump tables with -N.

Change-Id: I75c87f12de6262955d1df787f47c53de976f8a5f
Reviewed-on: https://go-review.googlesource.com/c/go/+/400455
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2022-04-15 00:53:40 +00:00
Roland Shoemaker
cc43e191ce crypto/x509: don't allow too long serials
Don't create certificates that have serial numbers that are longer
than 20 octets (when encoded), since these are explicitly disallowed
by RFC 5280.

Change-Id: I292b7001f45bed0971b2d519b6de26f0b90860ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/400377
Reviewed-by: Roland Shoemaker <roland@golang.org>
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Reviewed-by: Damien Neil <dneil@google.com>
2022-04-14 22:52:29 +00:00
Keith Randall
c4b2288755 cmd/compile: add jump table codegen test
Change-Id: Ic67f676f5ebe146166a0d3c1d78a802881320e49
Reviewed-on: https://go-review.googlesource.com/c/go/+/400375
Run-TryBot: Keith Randall <khr@golang.org>
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2022-04-14 21:16:29 +00:00
Keith Randall
3d8cb26504 cmd/compile: modify switches of strings to use jump table for lengths
Reorganize the way we rewrite expression switches on strings, so that
jump tables are naturally used for the outer switch on the string length.

The changes to the prove pass in this CL are required so as to not repeat
the test for string length in each case.

name                         old time/op  new time/op  delta
SwitchStringPredictable    2.28ns ± 9%  2.08ns ± 5%   -9.04%  (p=0.000 n=10+10)
SwitchStringUnpredictable  10.5ns ± 1%   9.5ns ± 1%   -9.08%  (p=0.000 n=9+10)

Update #5496
Update #34381

Change-Id: Ie6846b1dd27f3e472f7c30dfcc598c68d440b997
Reviewed-on: https://go-review.googlesource.com/c/go/+/395714
Run-TryBot: Keith Randall <khr@golang.org>
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2022-04-14 21:16:11 +00:00
Keith Randall
01b9ae22ed cmd/compile: constant-fold switches early in compilation
So that the inliner knows all the other cases are dead and doesn't
accumulate any cost for them.

The canonical case for this is switching on runtime.GOOS, which occurs
several places in the stdlib.

Fixes #50253

Change-Id: I44823aaebb6c1b03c9b0c12d10086db81954350f
Reviewed-on: https://go-review.googlesource.com/c/go/+/399694
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2022-04-14 19:37:30 +00:00
Keith Randall
1ba96d8c09 cmd/compile: implement jump tables
Performance is kind of hard to exactly quantify.

One big difference between jump tables and the old binary search
scheme is that there's only 1 branch statement instead of O(n) of
them. That can be both a blessing and a curse, and can make evaluating
jump tables very hard to do.

The single branch can become a choke point for the hardware branch
predictor. A branch table jump must fit all of its state in a single
branch predictor entry (technically, a branch target predictor entry).
With binary search that predictor state can be spread among lots of
entries. In cases where the case selection is repetitive and thus
predictable, binary search can perform better.

The big win for a jump table is that it doesn't consume so much of the
branch predictor's resources. But that benefit is essentially never
observed in microbenchmarks, because the branch predictor can easily
keep state for all the binary search branches in a microbenchmark. So
that benefit is really hard to measure.

So predictable switch microbenchmarks are ~useless - they will almost
always favor the binary search scheme. Fully unpredictable switch
microbenchmarks are better, as they aren't lying to us quite so
much. In a perfectly unpredictable situation, a jump table will expect
to incur 1-1/N branch mispredicts, where a binary search would incur
lg(N)/2 of them. That makes the crossover point at about N=4. But of
course switches in real programs are seldom fully unpredictable, so
we'll use a higher crossover point.

Beyond the branch predictor, jump tables tend to execute more
instructions per switch but have no additional instructions per case,
which also argues for a larger crossover.

As far as code size goes, with this CL cmd/go has a slightly smaller
code segment and a slightly larger overall size (from the jump tables
themselves which live in the data segment).

This is a case where some FDO (feedback-directed optimization) would
be really nice to have. #28262

Some large-program benchmarks might help make the case for this
CL. Especially if we can turn on branch mispredict counters so we can
see how much using jump tables can free up branch prediction resources
that can be gainfully used elsewhere in the program.

name                         old time/op  new time/op  delta
Switch8Predictable         1.89ns ± 2%  1.27ns ± 3%  -32.58%  (p=0.000 n=9+10)
Switch8Unpredictable       9.33ns ± 1%  7.50ns ± 1%  -19.60%  (p=0.000 n=10+9)
Switch32Predictable        2.20ns ± 2%  1.64ns ± 1%  -25.39%  (p=0.000 n=10+9)
Switch32Unpredictable      10.0ns ± 2%   7.6ns ± 2%  -24.04%  (p=0.000 n=10+10)

Fixes #5496
Update #34381

Change-Id: I3ff56011d02be53f605ca5fd3fb96b905517c34f
Reviewed-on: https://go-review.googlesource.com/c/go/+/357330
Run-TryBot: Keith Randall <khr@golang.org>
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2022-04-14 19:30:00 +00:00
Than McIntosh
dd97871282 debug/dwarf: better stmt list attr checking in LineReader
Check for insane statement list attribute values when
constructing LineReader's for a compilation unit.

Fixes #52354.

Change-Id: Icb5298db31f6c5fe34c44e0ed4fe277a7cd676b9
Reviewed-on: https://go-review.googlesource.com/c/go/+/400255
Run-TryBot: Than McIntosh <thanm@google.com>
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2022-04-14 18:00:13 +00:00
Joe Tsai
62b8ec744b math: improve documentation of Copysign
Name the arguments in a way that is more self-describing.
Many code editor tools show a snippet of the function and
its arguments. However, "x" and "y" are not helpful in determining
which is the sign and which is the magnitude,
short of reading the documentation itself.

Name the sign argument as "sign" to be explicit.
This follows the same naming convention as IsInf.

Change-Id: Ie3055009e475f96c92d5ea7bfe9828eed908c78b
Reviewed-on: https://go-review.googlesource.com/c/go/+/400177
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
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2022-04-14 17:42:53 +00:00
Keith Randall
cb702a2a56 cmd/compile: fold constant shifts into (SHL|SHR|SAR)Xload ops
We should prefer a constant shift op to a X shift op.
That way we don't have to materialize the constant to shift by.

Should fix GOAMD64=v3 builder

Change-Id: I56b45d2940c959382b970e3f962ed4a09cc2a239
Reviewed-on: https://go-review.googlesource.com/c/go/+/400254
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Wayne Zuo <wdvxdr@golangcn.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
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2022-04-14 15:54:48 +00:00
Jorropo
d255203742 cmd/compile: remove unused offset calculation in ssagen#rtcall
This offR accumulation isn't used and some really similar code is done
later in the Load results block.

Change-Id: I2f77a7bfd568e7e5eb9fc519e7c552401b3af9b8
GitHub-Last-Rev: 2c91e5c898
GitHub-Pull-Request: golang/go#52316
Reviewed-on: https://go-review.googlesource.com/c/go/+/400094
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2022-04-13 20:30:44 +00:00
zhangyunhao
72e77a7f41 sort: use pdqsort
- Across all benchmarks, pdqsort is never significantly slower than the previous algorithm.
- In common patterns, pdqsort is often faster (i.e. 10x faster in sorted slices).

The pdqsort is described at https://arxiv.org/pdf/2106.05123.pdf

This CL is inspired by both C++ implementation and Rust implementation.
- C++ implementation: https://github.com/orlp/pdqsort
- Rust implementation: https://docs.rs/pdqsort/latest/pdqsort/

For #50154

name                   old time/op  new time/op  delta
SearchWrappers-16      72.8ns ± 3%  75.1ns ± 2%   +3.25%  (p=0.000 n=20+10)
SortString1K-16        85.2µs ± 3%  86.2µs ± 5%     ~     (p=0.247 n=19+10)
SortString1K_Slice-16  84.6µs ± 4%  86.1µs ± 4%     ~     (p=0.120 n=20+10)
StableString1K-16       112µs ± 5%   112µs ± 5%     ~     (p=0.604 n=19+10)
SortInt1K-16           44.8µs ± 3%  43.2µs ± 2%   -3.68%  (p=0.000 n=20+10)
SortInt1K_Sorted-16    28.2µs ± 3%   3.3µs ± 3%  -88.16%  (p=0.000 n=19+10)
SortInt1K_Reversed-16  29.4µs ± 3%   4.8µs ± 2%  -83.59%  (p=0.000 n=20+10)
SortInt1K_Mod8-16      25.1µs ± 2%  20.0µs ± 2%  -20.35%  (p=0.000 n=18+10)
StableInt1K-16         51.3µs ± 3%  50.9µs ± 2%     ~     (p=0.562 n=20+9)
StableInt1K_Slice-16   49.5µs ± 2%  50.7µs ± 4%   +2.55%  (p=0.009 n=19+10)
SortInt64K-16          4.73ms ± 3%  4.49ms ± 4%   -5.08%  (p=0.000 n=20+10)
SortInt64K_Slice-16    4.51ms ± 3%  4.35ms ± 1%   -3.42%  (p=0.000 n=20+8)
StableInt64K-16        4.85ms ± 2%  4.82ms ± 2%     ~     (p=0.267 n=20+10)
Sort1e2-16             27.9µs ± 1%  28.1µs ± 2%     ~     (p=0.198 n=20+10)
Stable1e2-16           56.6µs ± 2%  55.0µs ± 2%   -2.88%  (p=0.000 n=20+10)
Sort1e4-16             5.51ms ± 1%  5.36ms ± 1%   -2.58%  (p=0.000 n=19+9)
Stable1e4-16           17.8ms ± 1%  17.3ms ± 1%   -2.40%  (p=0.000 n=20+10)
Sort1e6-16              833ms ± 1%   807ms ± 1%   -3.02%  (p=0.000 n=20+10)
Stable1e6-16            3.49s ± 2%   3.44s ± 1%   -1.41%  (p=0.001 n=20+10)

Change-Id: Iecded047d237b9330b5a4101001a5fdc2f50646a
Reviewed-on: https://go-review.googlesource.com/c/go/+/371574
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
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2022-04-13 20:16:24 +00:00
Roland Shoemaker
9298f604f4 crypto/x509: add CertPool.Clone
Export the previously private method copy as Clone.

Fixes #35044

Change-Id: I5403d6a3b9f344c980c1c89a6823e1a49dcda26b
Reviewed-on: https://go-review.googlesource.com/c/go/+/400175
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2022-04-13 19:04:59 +00:00
Dmitri Shuralyov
1f11660f54 [dev.boringcrypto] misc/boring: add new releases to RELEASES file
Change-Id: I5d2d64acd501bae90e2027f55ac6398f71dafca3
Reviewed-on: https://go-review.googlesource.com/c/go/+/400157
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2022-04-13 18:41:53 +00:00
Roland Shoemaker
d65a41329e crypto/x509: support nil pools in CertPool.Equal
Otherwise we panic if either pool is nil.

Change-Id: I8598e3c0f3a5294135f1c330e319128d552ebb67
Reviewed-on: https://go-review.googlesource.com/c/go/+/399161
Reviewed-by: Damien Neil <dneil@google.com>
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2022-04-13 18:06:43 +00:00
Roland Shoemaker
a78db879b3 crypto/x509: omit empty extensions SEQUENCE
In CreateCertificate, if there are no extensions, don't include the
extensions SEQUENCE in the encoded certificate.

Why, you might ask, does the encoding/asn1 tag 'optional' not do
the same thing as 'omitempty'? Good question, no clue, fixing that
would probably break things in horrific ways.

Fixes #52319

Change-Id: I84fdd5ff3e4e0b0a59e3bf86e7439753b1e1477b
Reviewed-on: https://go-review.googlesource.com/c/go/+/399827
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2022-04-13 18:05:20 +00:00
Wayne Zuo
66f03f79da cmd/compile: add SHLX&SHRX without load
Change-Id: I79eb5e7d6bcb23f26d3a100e915efff6dae70391
Reviewed-on: https://go-review.googlesource.com/c/go/+/399061
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2022-04-13 17:48:36 +00:00
Wayne Zuo
517781b391 cmd/compile: add SARXQload and SARXLload
Change-Id: I4e8dc5009a5b8af37d71b62f1322f94806d3e9d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/399056
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2022-04-13 17:48:12 +00:00
Dmitri Shuralyov
bc3e5d0ab7 [dev.boringcrypto] misc/boring: remove -trust and individual reviewers
The -trust flag has become obsolete.

A list of individual reviewers may become out of date, and these
scripts (and their backports) are probably not the optimal place
for it.

Change-Id: Ibf1bc508f0192b160c955e3deabae34f4d1ab54c
Reviewed-on: https://go-review.googlesource.com/c/go/+/399538
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2022-04-13 15:20:22 +00:00
Meng Zhuo
b55a2fb3b0 runtime: port memmove, memclr to register ABI on riscv64
This allows memmove and memclr to be invoked using the new
register ABI on riscv64.

Change-Id: I3308d52e06547836cffcc533740fe535624e78d8
Reviewed-on: https://go-review.googlesource.com/c/go/+/361975
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2022-04-13 01:15:22 +00:00
hopehook
65558a4f3d cmd/asm: update comment to refer to #44505
Updates #44505

Change-Id: I400110c33e69decf133fe9c4b582a450b7258b39
Reviewed-on: https://go-review.googlesource.com/c/go/+/399514
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2022-04-12 23:50:58 +00:00
Cherry Mui
9c7f0b1ccd cmd/link: mangle symbol ABI name for linker-generated symbols
The ABI mangling code skips symbols that are not loaded from Go
objects. Usually that is fine, as other symbols don't need name
mangling. But trampolines are linker generated and have the same
symbol version (ABI) as the underlying symbol. We need to avoid
symbol name collisions for trampolines, such as a trampoline to
f<ABI0> and a trampoline to f<ABIInternal>. We could explicitly
incorportate the ABI into the trampoline name. But as we already
have the name mangling scheme we could just use that.

The original code excludes external symbols probably because
symbols from C object don't need mangling. But a C symbol and a
Go symbol shouldn't have same name, and so the condition won't
apply.

Also exclude static symbols as they don't need mangling.

Change-Id: I298eb1d64bc0c3da0154f0146b95c4d26ca2f47a
Reviewed-on: https://go-review.googlesource.com/c/go/+/399894
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2022-04-12 23:24:32 +00:00
Keith Randall
1f97f960e7 cmd/link: don't sort pclntab entries
They are already in a good order. The sort here does nothing, as
all the SymValues are 0. Sorting just arbitrarily permutes items
because everything is equal and the sort isn't stable.

Not sure why the ordering of these symbols matter. That ordering was
added in CL 243223.

Change-Id: Iee153394afdb39387701cfe0375bc022cf4bd489
Reviewed-on: https://go-review.googlesource.com/c/go/+/399540
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2022-04-12 23:13:38 +00:00
Roland Shoemaker
fc1d4c11df cmd/go: fix TestScript/test_fuzz_minimize_interesting flake
check_testdata/check_testdata.go used the encoding of the corpus entry
file, rather than the input string itself, when checking the expected
size of the minimized value. Instead, use the actual byte length, which
should bypass flakiness.

While we are here, use somewhat simpler fuzz targets, that use byte
slices rather than strings, and only execute the targets when fuzzing (
skipping the 'run' phase.)

Fixes #52285

Change-Id: I48c3780934891eec4a9e38d93abb4666091cb580
Reviewed-on: https://go-review.googlesource.com/c/go/+/399814
Run-TryBot: Roland Shoemaker <roland@golang.org>
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2022-04-12 22:35:20 +00:00
Archana R
6183920a33 math/big: Implement shlVU and shrVU in ASM for PPC64
Currently the shift left and shift right functions are coded in .go
on PPC64. Implementing them in ASM just like AMD and ARM results in
overall speedup of shift benchmarks on POWER8/9/10.

name                        old time/op  new time/op  delta
NonZeroShifts/1/shrVU       8.50ns ± 0%  5.21ns ± 0%  -38.66%
NonZeroShifts/1/shlVU       8.85ns ± 1%  5.24ns ± 0%  -40.78%
NonZeroShifts/2/shrVU       9.16ns ± 0%  5.51ns ± 0%  -39.80%
NonZeroShifts/2/shlVU       9.24ns ± 2%  5.61ns ± 0%  -39.28%
NonZeroShifts/3/shrVU       10.6ns ± 0%   6.8ns ± 0%  -35.78%
NonZeroShifts/3/shlVU       10.7ns ± 2%   6.4ns ± 0%  -40.82%
NonZeroShifts/4/shrVU       12.4ns ± 0%   7.7ns ± 0%  -38.12%
NonZeroShifts/4/shlVU       12.3ns ± 1%   7.5ns ± 0%  -38.67%
NonZeroShifts/5/shrVU       13.2ns ± 0%   8.5ns ± 0%  -35.51%
NonZeroShifts/5/shlVU       13.3ns ± 2%   9.3ns ± 0%  -30.05%
NonZeroShifts/10/shrVU      16.5ns ± 0%  13.1ns ± 0%  -20.12%
NonZeroShifts/10/shlVU      16.8ns ± 1%  14.1ns ± 0%  -16.02%
NonZeroShifts/100/shrVU      122ns ± 0%    94ns ± 0%  -22.87%
NonZeroShifts/100/shlVU      115ns ± 0%   103ns ± 0%  -10.50%
NonZeroShifts/1000/shrVU    1.10µs ± 0%  0.91µs ± 0%  -17.03%
NonZeroShifts/1000/shlVU    1.02µs ± 0%  0.93µs ± 0%   -8.74%
NonZeroShifts/10000/shrVU   10.9µs ± 0%   9.1µs ± 0%  -16.66%
NonZeroShifts/10000/shlVU   10.1µs ± 0%   9.3µs ± 0%   -8.19%
NonZeroShifts/100000/shrVU   109µs ± 0%    91µs ± 0%  -16.01%
NonZeroShifts/100000/shlVU   101µs ± 0%    94µs ± 0%   -7.16%

Change-Id: Ia31951cc29a4169beb494d2951427cbe1e963b11
Reviewed-on: https://go-review.googlesource.com/c/go/+/384474
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Reviewed-by: Ian Lance Taylor <iant@google.com>
2022-04-12 22:32:01 +00:00
Bryan C. Mills
d85694ab4f doc/go1.19: document cmd/go changes involving -trimpath
Updates #51461.

Change-Id: Ie878a9f630062d62027de895750a070b50428a9f
Reviewed-on: https://go-review.googlesource.com/c/go/+/399214
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2022-04-12 22:05:26 +00:00
Damien Neil
f66925e854 syscall: check correct group in Faccessat
The Faccessat call checks the user, group, or other permission bits of a
file to see if the calling process can access it. The test to see if the
group permissions should be used was made with the wrong group id, using
the process's group id rather than the file's group id. Fix this to use
the correct group id.

No test since we cannot easily change file permissions when not running
as root and the test is meaningless if running as root.

For #52313

Change-Id: I4e2c84754b0af7830b40fd15dedcbc58374d75ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/399539
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2022-04-12 21:12:19 +00:00
Bryan C. Mills
4569fe6410 cmd/go: allow '-buildvcs=auto' and treat it as the default
When we added VCS stamping in the Go 1.18 release, we defaulted to
-buildvcs=true, on the theory that most folks will actually want VCS
information stamped.

We also made -buildvcs=true error out if a VCS directory is found and
no VCS tool is available, on the theory that a user who builds with
'-buildvcs=true' will be very surprised if the VCS metadata is
silently missing.

However, that causes a problem for CI environments that don't have the
appropriate VCS tool installed. (And we know that's a common situation
because we're in that situation ourselves — see #46693!)

The new '-buildvcs=auto' setting provides a middle ground: it stamps
VCS information by default when the tool is present (and reports
explicit errors if the tool errors out), but omits the metadata
when the tool isn't present at all.

Fixes #51748.
Updates #51999.

Change-Id: Iebc955c2af0abca9b7517f62ca48b1d944eb2df4
Reviewed-on: https://go-review.googlesource.com/c/go/+/398855
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2022-04-12 20:22:45 +00:00
Wayne Zuo
6f5590edf6 cmd/compile: always write fun[0] in incomplete itab
runtime.getitab need filled fun[0] to identify whether
implemented the interface.

Fixes #51700
Fixes #52228

Change-Id: I0173b98f4e1b45e3a0183a5b60229d289140d1e6
Reviewed-on: https://go-review.googlesource.com/c/go/+/399058
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2022-04-12 17:06:19 +00:00
tenkoh
5bf6c97e76 cmd/go: open correct path when loading embeds from root directory
The existing implementation of `load.resolveEmbed`
uses an expression like `path[len(pkgdir)+1:]`.
Though the `+1` is intended to remove a prefix slash,
the expression returns an incorrect path when `pkgdir`
is "/". (ex.: when removing "/" from "/foo", want "foo",
but got "oo")

It seems that `str.TrimFilePathPrefix` would solve
the problem, but the function contains the same bug.

So, this commit fixes `str.TrimFilePathPrefix` then
applies it to `load.resolveEmbed` to solve the issue.
The fix is quite simple. First, remove prefix. Then
check whether the remained first letter is equal to
`filepath.Separator`. If so, remove it then return.

Fixed #49570

Change-Id: I26ab727ee4dfcbf51ed9bd0a573957ced2154515
Reviewed-on: https://go-review.googlesource.com/c/go/+/396694
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2022-04-12 16:47:01 +00:00
Tobias Klauser
8f1d5d0a41 cmd/go/internal/modload: remove aix from stat_openfile.go comment
syscall.Access is supported and used on aix since CL 263540.

Change-Id: Ie50cc3da68b49b22d622d94faec0231c52502037
Reviewed-on: https://go-review.googlesource.com/c/go/+/396374
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2022-04-12 16:45:11 +00:00
Julie Qiu
45c3387d77 encoding/pem: fix stack overflow in Decode
Previously, Decode called decodeError, a recursive function that was
prone to stack overflows when given a large PEM file containing errors.

Credit to Juho Nurminen of Mattermost who reported the error.

Fixes CVE-2022-24675
Fixes #51853

Change-Id: Iffe768be53c8ddc0036fea0671d290f8f797692c
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1391157
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Filippo Valsorda <valsorda@google.com>
(cherry picked from commit 794ea5e828010e8b68493b2fc6d2963263195a02)
Reviewed-on: https://go-review.googlesource.com/c/go/+/399820
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2022-04-12 15:19:32 +00:00
Lynn Boger
9ccf5b8e86 runtime: improve memmove for ppc64x
This improves performance of memmove for larger moves by
unrolling the main loop from 32 byte to 64 byte moves.

The improvement of the relevant sizes on a power9:

Memmove/64      5.11ns ± 0%    5.00ns ± 0%   -2.21%
Memmove/128     8.26ns ± 0%    5.88ns ± 0%  -28.83%
Memmove/256     12.7ns ± 0%     8.6ns ± 0%  -31.94%
Memmove/512     17.9ns ± 0%    14.3ns ± 0%  -19.87%
Memmove/1024    33.3ns ± 0%    27.0ns ± 0%  -18.92%
Memmove/2048    72.1ns ± 0%    51.8ns ± 0%  -28.25%
Memmove/4096     126ns ± 0%     110ns ± 0%  -12.63%


Change-Id: I74162a9f152d7752a8281da1b89a66da99a3fdc9
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2022-04-12 13:54:06 +00:00
Wayne Zuo
d6320f1a58 cmd/compile: add SARX instruction for GOAMD64>=3
name                    old time/op  new time/op  delta
ShiftArithmeticRight-8  0.68ns ± 5%  0.30ns ± 6%  -56.14%  (p=0.000 n=10+10)

Change-Id: I052a0d7b9e6526d526276444e588b0cc288beff4
Reviewed-on: https://go-review.googlesource.com/c/go/+/399055
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2022-04-12 12:59:27 +00:00
Matthew Dempsky
2b31abc528 test: add //go:build support to run.go
gofmt is rewriting +build comments into //go:build anyway, so update
the test script to support both.

Change-Id: Ia6d950cfaa2fca9f184b8b2d3625a551bff88dde
Reviewed-on: https://go-review.googlesource.com/c/go/+/399794
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2022-04-12 05:46:57 +00:00
Bryan C. Mills
f2d9ab263b cmd/go: set GOROOT explicitly for 'go generate' subprocesses
Code generators may reasonably expect to find the GOROOT for which the
code is being generated.

If the generator invokes 'go run' (which ought to be reasonable to do)
and the user has set 'GOFLAGS=trimpath' (which also ought to be
reasonable), then either 'go generate' or 'go run' needs to set GOROOT
explicitly.

I would argue that it is more appropriate for 'go generate' to set
GOROOT than for 'go run' to do so, since a user may reasonably invoke
'go run' to reproduce a user-reported bug in a standalone Go program,
but should not invoke 'go generate' except to regenerate code for a Go
package.

Updates #51461.

Change-Id: Iceba233b4eebd57c40cf5dcd4af9031d210dc9d8
Reviewed-on: https://go-review.googlesource.com/c/go/+/399157
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2022-04-12 03:13:39 +00:00
Bryan C. Mills
e299381cd1 cmd/go: fix TestScript/build_trimpath_goroot when built with a mismatched GOROOT_FINAL
Fixes #52236.
Updates #51461.

Change-Id: Ie91e0256afd45e9bbd60fd8cdc696363027ab696
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2022-04-12 03:13:28 +00:00
Bryan Mills
d4dbad53ca Revert "cmd/compile/internal: fix test error on loong64"
This reverts CL 367043.

Reason for revert: auto-submitted prematurely, breaking tests on most builders.

Change-Id: I6da319fb042b629bcd6f549be638497a357e7d28
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2022-04-12 03:07:42 +00:00
Xiaodong Liu
ace7672526 cmd/compile/internal: fix test error on loong64
For TestLogOpt test case, add loong64 support to test the host
architecture and os.

The Ctz64 is not intrinsified on loong64 for TestIntendedInlining.

Contributors to the loong64 port are:
  Weining Lu <luweining@loongson.cn>
  Lei Wang <wanglei@loongson.cn>
  Lingqin Gong <gonglingqin@loongson.cn>
  Xiaolin Zhao <zhaoxiaolin@loongson.cn>
  Meidan Li <limeidan@loongson.cn>
  Xiaojuan Zhai <zhaixiaojuan@loongson.cn>
  Qiyuan Pu <puqiyuan@loongson.cn>
  Guoqi Chen <chenguoqi@loongson.cn>

This port has been updated to Go 1.15.6:
  https://github.com/loongson/go

Updates #46229

Change-Id: I4ca290bf725425a9a6ac2c6767a5bf4ff2339d0e
Reviewed-on: https://go-review.googlesource.com/c/go/+/367043
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2022-04-12 02:20:36 +00:00
champly
ca7c6ef33d runtime/chan.go: improve closed channel receive performance
Use this benchmark ut:

```go
func BenchmarkReceiveDataFromClosedChan(b *testing.B) {
	count := b.N
	ch := make(chan struct{}, count)
	for i := 0; i < count; i++ {
		ch <- struct{}{}
	}

	b.ResetTimer()
	for range ch {
	}
}
```

Benchmark 10 times(`go test -bench=.`), and then use `benchstat` got the result:

```shell
name                         old time/op  new time/op  delta
ReceiveDataFromClosedChan-5  12.0ns ± 1%  11.4ns ± 0%  -5.54%  (p=0.000 n=10+8)
```

Fixes:  #52067

Change-Id: I8db398cc8c04a46cb66ffb6768ab72a87903812f
GitHub-Last-Rev: 1e0142416f
GitHub-Pull-Request: golang/go#52068
Reviewed-on: https://go-review.googlesource.com/c/go/+/396884
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2022-04-12 02:18:23 +00:00
Ian Lance Taylor
a362d54614 os: mark Solaris nam/door/port files as irregular
No test because I'm too lazy to figure out how to create such files.

Fixes #52259

Change-Id: I7a07f49993cf046888729e9206ed53dddcf9cb13
Reviewed-on: https://go-review.googlesource.com/c/go/+/399435
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2022-04-12 01:41:47 +00:00
hopehook
370cadd0e4 cmd/compile: add a test case and some comments for deadlock on syntax error
After CL 398014 fixed a compiler deadlock on syntax errors,
this CL adds a test case and more details for that.

How it was fixed:

CL 57751 introduced a channel "sem" to limit the number of
simultaneously open files.

Unfortunately, when the number of syntax processing goroutines
exceeds this limit, will easily trigger deadlock.

In the original implementation, "sem" only limited the number
of open files, not the number of concurrent goroutines, which
will cause extra goroutines to block on "sem". When the p.err
of the following iteration happens to be held by the blocking
goroutine, it will fall into a circular wait, which is a deadlock.

CL 398014 fixed the above deadlock, also see issue #52127.

First, move "sem <- struct{}{}" to the outside of the syntax
processing goroutine, so that the number of concurrent goroutines
does not exceed the number of open files, to ensure that all
goroutines in execution can eventually write to p.err.

Second, move the entire syntax processing logic into a separate
goroutine to avoid blocking on the producer side.

Change-Id: I1bb89bfee3d2703784f0c0d4ded82baab2ae867a
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2022-04-12 01:18:27 +00:00
nimelehin
be0262a127 cmd/compile: fix compilation crash with several blank labels
Fixes #52278

Change-Id: Ibf67c7b019feec277d316e04d93b458efea133fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/399574
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2022-04-12 00:32:31 +00:00
zhouguangyuan
ec5e5dba6f runtime: fix name of type parameter
CL 372774 is for reflect, this CL is for _type in runtime.
Add a test case to ensure the name method of _type can be exercised.

Updates #50208

Change-Id: I26ccf8c5c574dd9e78510cf29eb40ae7c8d449ab
Reviewed-on: https://go-review.googlesource.com/c/go/+/393917
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2022-04-12 00:32:29 +00:00
Maxime Soulé
ff14e844d2 net/http/httptest: allow multiple fields be present in one Trailer field
Fixes #51761

Change-Id: Ibaa17076ba51b666e25333e78180b8c7c4c940ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/393616
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2022-04-11 23:17:38 +00:00
Keith Randall
ea7e3e3c0f runtime: align m.procid to 8 bytes on 32-bit systems
https://go-review.googlesource.com/c/go/+/383434 started using
atomic Load64 on this field, which breaks 32 bit platforms which
require 64-bit alignment of uint64s that are passed to atomic operations.

Not sure why this doesn't break everywhere, but I saw it break on
my laptop during all.bash.

Change-Id: Ida27b23068b3cc7208fce3c97b69a464ccf68209
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2022-04-11 22:49:56 +00:00
yangwenmai
11c450fa58 A+C: add Wen Yang (individual CLA)
Change-Id: Iaac18d78b4a11698d0b5f70b1d5143c0da8a6943
Reviewed-on: https://go-review.googlesource.com/c/go/+/399299
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2022-04-11 22:24:03 +00:00