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
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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
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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
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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
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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
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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
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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
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Otherwise we panic if either pool is nil.
Change-Id: I8598e3c0f3a5294135f1c330e319128d552ebb67
Reviewed-on: https://go-review.googlesource.com/c/go/+/399161
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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
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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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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
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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
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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
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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
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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
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runtime.getitab need filled fun[0] to identify whether
implemented the interface.
Fixes#51700Fixes#52228
Change-Id: I0173b98f4e1b45e3a0183a5b60229d289140d1e6
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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
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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)
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gofmt is rewriting +build comments into //go:build anyway, so update
the test script to support both.
Change-Id: Ia6d950cfaa2fca9f184b8b2d3625a551bff88dde
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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
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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
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No test because I'm too lazy to figure out how to create such files.
Fixes#52259
Change-Id: I7a07f49993cf046888729e9206ed53dddcf9cb13
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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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Fixes#52278
Change-Id: Ibf67c7b019feec277d316e04d93b458efea133fb
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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
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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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Now that gofmt is reformatting these, we can't get away with
not knowing about directives such as //export and //extern (for gccgo).
Otherwise "//export foo" and "//extern foo" turn into "// export foo",
and "// extern foo", which are completely different meanings.
For #51082.
Change-Id: Id0970331fa0b52ab5fa621631b5fa460767068bb
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[This CL is part of a sequence implementing the proposal #51082.
The design doc is at https://go.dev/s/godocfmt-design.]
Run the updated gofmt, which reformats doc comments,
on the main repository. Vendored files are excluded.
For #51082.
Change-Id: I7332f099b60f716295fb34719c98c04eb1a85407
Reviewed-on: https://go-review.googlesource.com/c/go/+/384268
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
[This CL is part of a sequence implementing the proposal #51082.
The design doc is at https://go.dev/s/godocfmt-design.]
Use the new per-Package go/doc API instead of the
top-level functions from go/doc. These handle links better.
For #51082.
Change-Id: I169b46d973673abdb6f126352c9f1e30f9fe1122
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[This CL is part of a sequence implementing the proposal #51082.
The design doc is at https://go.dev/s/godocfmt-design.]
Use go/doc/comment to implement the existing go/doc comment APIs,
as well as adding new APIs more tailored to the new world.
For #51082.
Change-Id: I05b97ecedbf7cf7b8dede7ace6736ed6d89204a9
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[This CL is part of a sequence implementing the proposal #51082.
The design doc is at https://go.dev/s/godocfmt-design.]
Reformat alldocs.go using the new doc comment formatter.
This file is so large it gets its own gofmt CL.
For #51082.
Change-Id: Ie14cf1aad776e6f4180d88245d05a86e5fb6a3b0
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[This CL is part of a sequence implementing the proposal #51082.
The design doc is at https://go.dev/s/godocfmt-design.]
Use go/doc/comment to reformat doc comments into a
standard form, enabling future expansion later and generally
making it easier to edit and read doc comments.
For #51082.
Change-Id: I6ab3b80846f03d781951111e4c36f86f47d21bb2
Reviewed-on: https://go-review.googlesource.com/c/go/+/384264
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
[This CL is part of a sequence implementing the proposal #51082.
The design doc is at https://go.dev/s/godocfmt-design.]
Implement lists, like:
Three numbers:
- One
- Two
- Three
For #51082.
Change-Id: Id87d9c19bca677be968f3803809a9ea6c705f3ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/397286
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
[This CL is part of a sequence implementing the proposal #51082.
The design doc is at https://go.dev/s/godocfmt-design.]
Implement indented code blocks.
For #51082.
Change-Id: I0eacbf56e101424a875386cb6f26174b239561f5
Reviewed-on: https://go-review.googlesource.com/c/go/+/397285
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
