This allows the result of Type to be computed much faster.
Performance:
old new delta
1.76ns 0.66ns -62.27%
Change-Id: Ie007fd175aaa41b2f67c71fa2a34ab8d292dd0e0
Reviewed-on: https://go-review.googlesource.com/c/go/+/400335
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As is already done in strings package.
Change-Id: Ia45e6443ddf6beac5e70a1cc493119030e173139
GitHub-Last-Rev: 1174c25035
GitHub-Pull-Request: golang/go#52348
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This code was trying to iterate codepoints, but didn't reslice the string,
so it was reading the first codepoint over and over, if the string length was
not a multiple of the first codepoint length, this would cause to overshoot
past the end of the string.
This was a latent bug introduced in CL 384265 but was revealed to
Ngolo-fuzzing in OSS-Fuzz in CL 397277.
Fixes#52353
Change-Id: I13f0352e6ad13a42878927f3b1c18c58360dd40c
GitHub-Last-Rev: 424f6cfad1
GitHub-Pull-Request: golang/go#52356
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No test because we already have a test in the syscall package.
The issue reports 1 failure per 100,000 iterations, which is rare enough
that our builders won't catch the problem.
Fixes#52226
Change-Id: I17633ff6cf676b6d575356186dce42cdacad0746
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There are some symbol attributes that are encoded in the object
file. Currently, they are lost when cloning a symbol to external.
Copy them over.
Also delete CopyAttributes as it is no longer called anywhere.
Change-Id: I1497e3223a641704bf35aa3e904dd0eda2f8ec3e
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No separate test because this makes no difference for valid PE files.
Fixes#52350
Change-Id: I2aa011a4e8b34cb08052222e94c52627ebe99fbf
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The current implementation, although more succinct, relies on a runtime
lookup to a "constant" unexported map (which also needs to be
initialized at runtime).
The proposed implementation is able to be optimized by the compiler at
build-time, resulting in *much* more efficient instructions.
Additionally, unused string literals may even be removed altogether
from the generated binary in some cases.
This change is fully backwards-compatible behavior-wise with the
existing implementation.
Change-Id: I36450320aacff5b322195820552f2831d4fecd52
GitHub-Last-Rev: e2058f132e
GitHub-Pull-Request: golang/go#49811
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Refuse to create certificates with negative serial numbers, as they
are explicitly disallowed by RFC 5280.
We still allow parsing certificates with negative serial numbers,
because in the past there were buggy CA implementations which would
produce them (although there are currently *no* trusted certificates
that have this issue). We may want to revisit this decision if we can
find metrics about the prevalence of this issue in enterprise settings.
Change-Id: I131262008db99b6354f542f335abc68775a2d6d0
Reviewed-on: https://go-review.googlesource.com/c/go/+/400494
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Fixes#52239
Change-Id: I08b75e613e3c976855e39d01a6757d94e4207bf8
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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
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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
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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
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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
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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
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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
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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.
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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
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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.
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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
Reviewed-on: https://go-review.googlesource.com/c/go/+/399157
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
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
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Auto-Submit: Russ Cox <rsc@golang.org>
