Charlie Vieth [Wed, 24 Aug 2022 18:23:28 +0000 (14:23 -0400)]
bytes, strings: add ASCII fast path to EqualFold
This commit adds an ASCII fast path to bytes/strings EqualFold that
roughly doubles performance when all characters are ASCII.
It also changes strings.EqualFold to use `for range` for the first
string since this is ~10% faster than using utf8.DecodeRuneInString for
both (see #31666).
Change-Id: I058f3f97a08dc04d65af895674d85420f920abe1
Reviewed-on: https://go-review.googlesource.com/c/go/+/425459 Reviewed-by: Ian Lance Taylor <iant@google.com>
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Joe Tsai [Thu, 16 Jun 2022 00:29:25 +0000 (17:29 -0700)]
fmt: rely on utf8.AppendRune
This is both simpler and more performant.
The need for fmt.fmtC to manually check for utf8.MaxRune
is subtle to avoid overflow when converting uint64 to rune,
so a test case was added to exercise this edge case.
Change-Id: I0f2e6cce91dcd4cc6b88190c29807ca1c58e999d
Reviewed-on: https://go-review.googlesource.com/c/go/+/412335
Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
Auto-Submit: Robert Griesemer <gri@google.com>
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Ian Lance Taylor [Tue, 20 Sep 2022 19:24:07 +0000 (12:24 -0700)]
runtime: treat SI_TKILL like SI_USER on Linux
On Linux a signal sent using tgkill will have si_code == SI_TKILL,
not SI_USER. Treat the two cases the same. Add a Linux-specific test.
Change the test to use the C pause function rather than sleeping
for a second, as that achieves the same effect.
This is a roll forward of CL 431255 which was rolled back in CL 431715.
This new version skips flaky tests on more systems, and marks a new method
nosplit.
Change-Id: Ibf2d3e6fc43d63d0a71afa8fcca6a11fda03f291
Reviewed-on: https://go-review.googlesource.com/c/go/+/432136
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Joe Tsai [Thu, 8 Sep 2022 21:57:44 +0000 (14:57 -0700)]
time: optimize Parse for []byte arguments
When one has a []byte on hand, but desires to call the Parse function,
the conversion from []byte to string would allocate.
This occurs frequently through UnmarshalText and UnmarshalJSON.
This changes it such that the input string never escapes from
any of the Parse functions. Together with the compiler optimization
where the compiler stack allocates any string smaller than 32B
this makes most valid inputs for Parse(layout, string(input))
not require an allocation for the input string.
This optimization works well for most RFC3339 timestamps.
All timestamps with second resolution
(e.g., 2000-01-01T00:00:00Z or 2000-01-01T00:00:00+23:59)
or timestamps with nanosecond resolution in UTC
(e.g., 2000-01-01T00:00:00.123456789Z)
are less than 32B and benefit from this optimization.
Unfortunately, nanosecond timestamps with non-UTC timezones
(e.g., 2000-01-01T00:00:00.123456789+23:59)
do not benefit since they are 35B long.
Previously, this was not possible since the input leaked
to the error and calls to FixedZone with the zone name,
which causes the prover to give up and heap copy the []byte.
We fix this by copying the input string in both cases.
The advantage of this change is that you can now call Parse
with a []byte without allocating (most of the times).
The detriment is that the timezone and error path has an extra allocation.
Handling of timezones were already expensive (3 allocations and 160B allocated),
so the additional cost of another string allocation is relatively minor.
We should optimize for the common case, rather than the exceptional case.
Performance:
name old time/op new time/op delta
ParseRFC3339UTCBytes 54.4ns ± 1% 40.3ns ± 1% -25.91% (p=0.000 n=9+10)
Now that parsing of RFC3339 has been heavily optimized in CL 425197,
the performance gains by this optimization becomes relatively more notable.
Related to CL 345488.
Change-Id: I2a8a9cd6354b3bd46c2f57818ed2646a2e485f36
Reviewed-on: https://go-review.googlesource.com/c/go/+/429862 Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com>
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Erik Pellizzon [Mon, 19 Sep 2022 08:30:01 +0000 (08:30 +0000)]
crypto: use encoding append functions
Replace custom append functions in the hash functions with the implementation of the encoding/binary package that do the same thing.
The binary bigendian functions are already used in other parts of the code in the crypto package.
Change-Id: I76d2dbe143fc72a3b4ac06be312caf72bd71378a
GitHub-Last-Rev: 1c6c68279efbe2c5835d82db900f607c7bf36836
GitHub-Pull-Request: golang/go#55085
Reviewed-on: https://go-review.googlesource.com/c/go/+/431035
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Andy Pan [Sat, 27 Aug 2022 19:38:00 +0000 (03:38 +0800)]
all: replace package ioutil with os and io in src
For #45557
Change-Id: I56824135d86452603dd4ed4bab0e24c201bb0683
Reviewed-on: https://go-review.googlesource.com/c/go/+/426257
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mime/multipart: use %w when wrapping error in NextPart
Use "%w" instead of "%v" as format verb for error value in the NextPart
method. This way it will be possible to use common go error utilities
from std library when parsing from custom io.Readers.
This issue was discovered during attempts to use
http.Request.ParseMultipartForm together with http.MaxBytesHandler.
Change-Id: Idb82510fb536b66b51ed1d943737c4828f07c2f2
GitHub-Last-Rev: 8bc49c945c1b393bcfb4d8df545c93593c9bd7c4
GitHub-Pull-Request: golang/go#55133
Reviewed-on: https://go-review.googlesource.com/c/go/+/431675
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eric fang [Wed, 7 Sep 2022 08:34:52 +0000 (08:34 +0000)]
cmd/compile: Add some CMP and CMN optimization rules on arm64
This CL adds some optimizaion rules:
1, Converts CMP to CMN, or vice versa, when comparing with a negative
number.
2, For equal and not equal comparisons, CMP can be converted to CMN in
some cases. In theory we could do the same optimization for LT, LE, GT
and GE, but need to account for overflow, this CL doesn't handle them.
There are no noticeable performance changes.
Change-Id: Ia49266c019ab7908ebc9510c2f02e121b1607869
Reviewed-on: https://go-review.googlesource.com/c/go/+/429795 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com>
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Keith Randall [Mon, 19 Sep 2022 21:26:05 +0000 (17:26 -0400)]
runtime: make mSpanStateBox accessors nosplit
get, at least, is called from typedmemclr which must not be interruptible.
These were previously nosplit by accident before CL 424395 (the only
call they had was an intrinsic, so they were leaf functions, so they had
no prologue). After CL 424395 they contained a call (in noinline builds),
thus had a prologue, thus had a suspension point.
I have no idea how we might test this.
This is another motivating use case for having a nosplitrec directive
in the runtime.
Rob Pike [Sun, 18 Sep 2022 12:05:00 +0000 (22:05 +1000)]
flag: test IsBoolFlag when creating the usage message
Although I can't think of any reason to do this, it is possible for
a user-defined flag to implement IsBoolFlag but return "false".
This is nuts because checking the interface is satisfied should
obviously be sufficient, but the documentation kinda implies it's
not. And if you try this, you'll discover that the usage message
ignores the return value even though the rest of the package plays
nice. Bother.
So we fix it, as the fix is trivial: call the method when creating
the usage message.
Fixes #53473
Change-Id: I1ac80a876ad5626eebfc5ef6cb972cd3007afaad
Reviewed-on: https://go-review.googlesource.com/c/go/+/431102 Reviewed-by: Cherry Mui <cherryyz@google.com>
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Matthew Dempsky [Thu, 8 Sep 2022 21:31:42 +0000 (14:31 -0700)]
cmd/compile: skip emitting dictionaries with missing method expressions
The nounified frontend currently tries to construct dictionaries that
correspond to invalid instantiations (i.e., instantiations T[X] where
X does not satisfy the constraints specified on T's type parameter).
As a consequence, we may fail to find method expressions needed by the
dictionary.
The real fix for this is to avoid creating those dictionaries in the
first place, because they should never actually be needed at runtime.
But that seems scary for a backport: we've repeatedly attempted to
backport generics fixes, which have fixed one issue but introduced
another.
This CL is a minimally invasive solution to #54225, which avoids the
ICE by instead skipping emitting the invalid dictionary. If the
dictionary ends up not being needed (which I believe will always be
the case), then the linker's reachability analysis will simply ignore
its absence.
Or worst case, if the dictionary *is* reachable somehow, we've simply
turned an ICE into a link-time missing symbol failure. That's not
great for user experience, but it seems like a small trade off to
avoid risking breaking any other currently working code.
Updates #54225.
Change-Id: Ic379696079f4729b1dd6a66994a58cca50281a84
Reviewed-on: https://go-review.googlesource.com/c/go/+/429655 Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Keith Randall <khr@golang.org>
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Joel Sing [Sat, 3 Sep 2022 19:23:07 +0000 (05:23 +1000)]
cmd/compile: combine operations with immediate on riscv64
Replace two immediate operations with one, where possible.
Change-Id: Idc00e868155c9ca1d872aaaf70ea1f73e9eac4d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/428497 Reviewed-by: Wayne Zuo <wdvxdr@golangcn.org>
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Joel Sing [Sat, 17 Sep 2022 06:55:57 +0000 (16:55 +1000)]
internal/bytealg: correct alignment checks for compare/memequal on riscv64
On riscv64 we need 8 byte alignment for 8 byte loads - the existing check
was only ensuring 4 byte alignment, which potentially results in unaligned
loads being performed. Unaligned loads incur a significant performance penality
due to the resulting kernel traps and fix ups.
Adjust BenchmarkCompareBytesBigUnaligned so that this issue would have been
more readily visible.
Matthew Dempsky [Fri, 16 Sep 2022 21:27:01 +0000 (14:27 -0700)]
go/internal/gcimporter: fix ureader.go handling of local defined types
In unified IR, local defined types are promoted to a global defined
type with a "vargen" suffix. These shouldn't actually be exposed to
go/types users, because they're only relevant within function bodies,
which go/types doesn't support importing.
Moreover, in the case of defined types that were declared within a
generic function, they can have ambient type parameters, which the
go/types importer doesn't know how to handle (because they shouldn't
be needed for that use case).
While here, prune the gcimporter_test.go skip list, because some of
the listed failures have actually been fixed and all of them are
specific to the Go 1.18 (nounified) frontend. They all work correctly
with GOEXPERIMENT=unified.
Fixes #55110.
Change-Id: I7dd8b86355d910dfed1d47edbad7695144c3f84d
Reviewed-on: https://go-review.googlesource.com/c/go/+/431495 Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com> Reviewed-by: Cherry Mui <cherryyz@google.com>
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Matthew Dempsky [Fri, 16 Sep 2022 20:11:49 +0000 (13:11 -0700)]
test: add regress test for issue 55101
This test case already works with GOEXPERIMENT=unified, and it never
worked with Go 1.18 or Go 1.19. So this CL simply adds a regress test
to make sure it continues working.
Fixes #55101.
Change-Id: I7e06bfdc136ce124f65cdcf02d20a1050b841d42
Reviewed-on: https://go-review.googlesource.com/c/go/+/431455
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Resend of CL 315281 which was partially reverted by CL 354249 after the
original CL was suspected to cause test failures as reported in #48789.
It seems that both wait4 and wait6 lead to that particular deadlock, so
let's use wait6. That way we at least don't hit #13987 on netbsd.
Keith Randall [Sat, 17 Sep 2022 22:52:35 +0000 (18:52 -0400)]
cmd/compile: avoid using destination pointer base type in memmove optimization
The type of the source and destination of a memmove call isn't
always accurate. It will always be a pointer (or an unsafe.Pointer), but
the base type might not be accurate. This comes about because multiple
copies of a pointer with different base types are coalesced into a single value.
In the failing example, the IData selector of the input argument is a
*[32]byte in one branch of the type switch, and a *[]byte in the other branch.
During the expand_calls pass both IDatas become just copies of the input
register. Those copies are deduped and an arbitrary one wins (in this case,
*[]byte is the unfortunate winner).
Generally an op v can rely on v.Type during rewrite rules. But relying
on v.Args[i].Type is discouraged.
Fixes #55122
Change-Id: I348fd9accf2058a87cd191eec01d39cda612f120
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cuiweixie [Thu, 25 Aug 2022 14:08:10 +0000 (22:08 +0800)]
reflect: rtype.MethodByName using binary search
Change-Id: If36e9fd7d6b1993ca2d0d382e7fa52212170c798
Reviewed-on: https://go-review.googlesource.com/c/go/+/425481
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Damien Neil [Fri, 2 Sep 2022 21:48:28 +0000 (14:48 -0700)]
net/http: correctly test for leading header spaces in TestReadRequest_Bad
TestReadRequest_Bad's tests for leading whitespace in the first header
were also exercising the test verifying that a HEAD request has no
Content-Length. Also, the test intended to test a leading tab was
actually testing for a leading \t (literal backslash, literal t).
Change-Id: I05b46d05851b49bf75f1d1257c421b953b66ea9c
Reviewed-on: https://go-review.googlesource.com/c/go/+/428134 Reviewed-by: Cherry Mui <cherryyz@google.com>
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Roger Peppe [Thu, 3 Feb 2022 10:00:30 +0000 (10:00 +0000)]
time: implement Compare method
Fixes #50770.
Change-Id: If0104883bb409ec85827fa5b570f68099ad4fd1d
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Zeke Lu [Thu, 15 Sep 2022 03:57:43 +0000 (03:57 +0000)]
debug/elf: validate shstrndx
Changes:
1. When e_shstrndx holds the value SHN_UNDEF (0), the file has no section
name string table. In this case, do not try to set section names .
2. e_shstrndx should point to an SHT_STRTAB section. If it does not, returns
an error.
Change-Id: Ic8f228061d996fd7845dfa630719a1ba12d2bb60
GitHub-Last-Rev: aeb70ca8a08e7dbc36ed61bd5a2dabcf432540e9
GitHub-Pull-Request: golang/go#55001
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Michael Matloob [Wed, 15 Jun 2022 18:24:12 +0000 (14:24 -0400)]
cmd/go: clear GOPATH from build context when importing from module
In module mode, we shouldn't handle packages under GOPATH any
differently from other packages. Clear GOPATH from the build context
before Importing to ensure that.
Change-Id: If09094e72161f2c5da9102706781524e32f87782
GitHub-Last-Rev: 89949bc6ee8622be31c4e4db45ea6da11fd9053f
GitHub-Pull-Request: golang/go#54855
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misc/cgo: replace ioutil.ReadFile with os.ReadFile
For #45557
Change-Id: I25be5b437fa1c9b0e0c46802a9b37efc2d47bca0
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Since os.SEEK_SET was deprecated, use io.SeekStart instead.
Change-Id: I11ae496b071ab35412403ff73e52f3da73d5b120
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Now we have 8-byte alignment types on 32-bit system, so in some rare
case, e.g, generated wrapper for embedded interface, the function
argument may need more than 4 byte alignment. We could pad somehow, but
this is a rare case which makes it hard to ensure that we've got it right.
So relaxing the check for argument and return value region of the stack.
Fixes #54991
Change-Id: I34986e17a920254392a39439ad3dcb323da2ea8d
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cmd/compile,sync: make accessing address of zero offset struct field inline cost 0
Accessing the address of something often needs the same (or even less)
number of instructions as accessing the content of the thing. That would
help us rolling back the hack of CL 429766 to lower sync atomic types
inline cost.
Michael Anthony Knyszek [Sat, 17 Sep 2022 02:21:12 +0000 (02:21 +0000)]
runtime/internal/sys: make Len64 nosplit
CL 427615 causes failures when Len64 can't be inlined. It's unclear to
me why this wasn't a problem before, but it is used in sensitive
contexts and therefore really should be marked. Confirmed that the
failures in question reproduce without this change, and don't reproduce
with it.
Fixes #55117.
Change-Id: Ic3aa96af1420cc0c39551908d83f954725c712f5
Reviewed-on: https://go-review.googlesource.com/c/go/+/431058 Reviewed-by: Cherry Mui <cherryyz@google.com>
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Ian Lance Taylor [Thu, 15 Sep 2022 18:33:58 +0000 (11:33 -0700)]
runtime: treat SI_TKILL like SI_USER on Linux
On Linux a signal sent using tgkill will have si_code == SI_TKILL,
not SI_USER. Treat the two cases the same. Add a Linux-specific test.
Change the test to use the C pause function rather than sleeping
for a second, as that achieves the same effect.
Change-Id: I2a36646aecabcab9ec42ed9a048b07c2ff0a3987
Reviewed-on: https://go-review.googlesource.com/c/go/+/431255
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Return errors instead of calling t.Fatalf for timing-sensitive failure
modes. Scale the Sleep call to the timeout (so that it isn't too short
for the longer durations).
Fixes #54891.
Change-Id: I574e85e121becdda9ab8ee6bfd37c18a549d366d
Reviewed-on: https://go-review.googlesource.com/c/go/+/430955 Reviewed-by: Joel Sing <joel@sing.id.au>
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net: set AD bit in DNS queries when trust-ad in resolv.conf
Fixes #51152
Change-Id: Ib366e733434b4bb60ac93e6e622d9ba50bfe4e26
GitHub-Last-Rev: e98220d62fc4f5b60aa3e4839f46ecf8f8f75485
GitHub-Pull-Request: golang/go#54921
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Michael Anthony Knyszek [Thu, 8 Sep 2022 20:59:02 +0000 (20:59 +0000)]
runtime: tweak bgsweep "low-priority" heuristic
Currently bgsweep attempts to be a low-priority background goroutine
that runs mainly when the application is mostly idle. To avoid
complicating the scheduler further, it achieves this with a simple
heuristic: call Gosched after each span swept. While this is somewhat
inefficient as there's scheduling overhead on each iteration, it's
mostly fine because it tends to just come out of idle time anyway. In a
busy system, the call to Gosched quickly puts bgsweep at the back of
scheduler queues.
However, what's problematic about this heuristic is the number of
tracing events it produces. Average span sweeping latencies have been
measured as low as 30 ns, so every 30 ns in the sweep phase, with
available idle time, there would be a few trace events emitted. This
could result in an overwhelming number, making traces much larger than
they need to be. It also pollutes other observability tools, like the
scheduling latencies runtime metric, because bgsweep stays runnable the
whole time.
This change fixes these problems with two modifications to the
heursitic:
1. Check if there are any idle Ps before yielding. If there are, don't
yield.
2. Sweep at least 10 spans before trying to yield.
(1) is doing most of the work here. This change assumes that the
presence of idle Ps means that there is available CPU time, so bgsweep
is already making use of idle time and there's no reason it should stop.
This will have the biggest impact on the aforementioned issues.
(2) is a mitigation for the case where GOMAXPROCS=1, because we won't
ever observe a zero idle P count. It does mean that bgsweep is a little
bit higher priority than before because it yields its time less often,
so it could interfere with goroutine scheduling latencies more. However,
by sweeping 10 spans before volunteering time, we directly reduce trace
event production by 90% in all cases. The impact on scheduling latencies
should be fairly minimal, as sweeping a span is already so fast, that
sweeping 10 is unlikely to make a dent in any meaningful end-to-end
latency. In fact, it may even improve application latencies overall by
freeing up spans and sweep work from goroutines allocating memory. It
may be worth considering pushing this number higher in the future.
Another reason to do (2) is to reduce contention on npidle, which will
be checked as part of (1), but this is a fairly minor concern. The main
reason is to capture the GOMAXPROCS=1 case.
Fixes #54767.
Change-Id: I4361400f17197b8ab84c01f56203f20575b29fc6
Reviewed-on: https://go-review.googlesource.com/c/go/+/429615
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
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This change adds a metric to the runtime/metrics package which tracks
total mutex wait time for sync.Mutex and sync.RWMutex. The purpose of
this metric is to be able to quickly get an idea of the total mutex wait
time.
The implementation of this metric piggybacks off of the existing G
runnable tracking infrastructure, as well as the wait reason set on a G
when it goes into _Gwaiting.
Fixes #49881.
Change-Id: I4691abf64ac3574bec69b4d7d4428b1573130517
Reviewed-on: https://go-review.googlesource.com/c/go/+/427618 Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
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Michael Anthony Knyszek [Wed, 31 Aug 2022 18:21:48 +0000 (18:21 +0000)]
runtime: set G wait reason more consistently
Currently, wait reasons are set somewhat inconsistently. In a follow-up
CL, we're going to want to rely on the wait reason being there for
casgstatus, so the status quo isn't really going to work for that. Plus
this inconsistency means there are a whole bunch of cases where we could
be more specific about the G's status but aren't.
So, this change adds a new function, casGToWaiting which is like
casgstatus but also sets the wait reason. The goal is that by using this
API it'll be harder to forget to set a wait reason (or the lack thereof
will at least be explicit). This change then updates all casgstatus(gp,
..., _Gwaiting) calls to casGToWaiting(gp, ..., waitReasonX) instead.
For a number of these cases, we're missing a wait reason, and it
wouldn't hurt to add a wait reason for them, so this change also adds
those wait reasons.
For #49881.
Change-Id: Ia95e06ecb74ed17bb7bb94f1a362ebfe6bec1518
Reviewed-on: https://go-review.googlesource.com/c/go/+/427617 Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
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Michael Anthony Knyszek [Tue, 30 Aug 2022 22:18:01 +0000 (22:18 +0000)]
runtime: make the wait reason for a g blocked on a mutex more specific
This change adds 3 new waitReasons that correspond to sync.Mutex.Lock,
sync.RWMutex.RLock, and sync.RWMutex.Lock that are plumbed down into
semacquire1 by exporting new functions to the sync package from the
runtime.
Currently these three functions show up as "semacquire" in backtraces
which isn't very clear, though the stack trace itself should reveal
what's really going on. This represents a minor improvement to backtrace
readability, though blocking on an RWMutex.w.Lock will still show up as
blocking on a regular mutex (I suppose technically it is).
This is a step toward helping the runtime identify when a goroutine is
blocked on a mutex of some kind.
For #49881.
Change-Id: Ia409b4d27e117fe4bfdc25fa541e9c58d6d587b9
Reviewed-on: https://go-review.googlesource.com/c/go/+/427616
TryBot-Result: Gopher Robot <gobot@golang.org>
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Michael Anthony Knyszek [Fri, 6 May 2022 20:11:28 +0000 (20:11 +0000)]
runtime/metrics: add CPU stats
This changes adds a breakdown for estimated CPU usage by time. These
estimates are not based on real on-CPU counters, so each metric has a
disclaimer explaining so. They can, however, be more reasonably
compared to a total CPU time metric that this change also adds.
Fixes #47216.
Change-Id: I125006526be9f8e0d609200e193da5a78d9935be
Reviewed-on: https://go-review.googlesource.com/c/go/+/404307 Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Josh MacDonald <jmacd@lightstep.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com> Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
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Michael Anthony Knyszek [Tue, 30 Aug 2022 03:13:36 +0000 (03:13 +0000)]
runtime: shrink time histogram buckets
There are lots of useless buckets with too much precision. Introduce a
minimum level of precision with a minimum bucket bit. This cuts down on
the size of a time histogram dramatically (~3x). Also, pick a smaller
sub bucket count; we don't need 6% precision.
Also, rename super-buckets to buckets to more closely line up with HDR
histogram literature.
Change-Id: I199449650e4b34f2a6dca3cf1d8edb071c6655c0
Reviewed-on: https://go-review.googlesource.com/c/go/+/427615
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
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Robert Griesemer [Mon, 12 Sep 2022 22:51:32 +0000 (15:51 -0700)]
go/types, types2: allow (string...) signature with NewSignatureType
Includes cases where the core type of the variadic parameter is
a slice or bytestring. Permits a client to create the signature
for various instantiations of append.
Fixes #55030.
Change-Id: I0f4983eb00c088cbe1d87954ee0b2df0ccc3bc49
Reviewed-on: https://go-review.googlesource.com/c/go/+/430455
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
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Run-TryBot: Robert Griesemer <gri@google.com>
Cherry Mui [Thu, 15 Sep 2022 01:01:04 +0000 (21:01 -0400)]
cmd/link: suppress -no_pie deprecation warning on darwin
Apparently the new darwin linker starts to emit a warning about
-no_pie deprecation. Maybe we want to switch to PIE by default.
For now, suppress the warning. This also makes it easier for
backporting to previous releases.
For #54482.
Change-Id: I1a3b74c237a9d00ec3b030fc3a9940a31e5cd37e
Reviewed-on: https://go-review.googlesource.com/c/go/+/430937
Run-TryBot: Cherry Mui <cherryyz@google.com> Reviewed-by: Than McIntosh <thanm@google.com>
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Austin Clements [Mon, 29 Aug 2022 21:30:12 +0000 (17:30 -0400)]
cmd/dist: simplify exec.Cmd helpers for Go 1.19
When running on Go 1.19, we can further simplify some of the exec.Cmd
helpers due to API improvements. There's not much point in doing this
while the bootstrap is still 1.17, but this will queue up this
simplification in an obvious way for when we next upgrade the
bootstrap toolchain (#54265).
Austin Clements [Mon, 29 Aug 2022 21:24:01 +0000 (17:24 -0400)]
cmd/dist: simplify exec.Cmd helpers
Now that the required Go bootstrap version is 1.17, we can simplify
some of the logic for working with exec.Cmd.Env as those APIs have
been simplified.
Add printSelf function to prevent the function not found when running in godoc
sandbox. Beside, deleting the dummy test function to make the example show
the entire file, as we want to show the newly added printSelf function.
Russ Cox [Wed, 31 Aug 2022 18:37:11 +0000 (14:37 -0400)]
cmd/internal/objabi: record GO$GOARCH setting in object header
The object header string is meant to record the relevant toolchain
configuration, so that we don't import or link object files that are
incompatible with each other. One important part of compatibility
is the sub-architecture version (GOARM for GOARCH=arm, and so on).
Add the sub-architecture info to the object header line so that
binaries cannot be built that have inconsistent sub-architecture
configurations across the build.
This check is only important when the build system makes a mistake.
Builds using the go command don't make this kind of mistake anymore,
but we just debugged a difficult problem inside Google where a custom
build system had built part of a program with GOARM=5 and part of
a program with GOARM=7, resulting in corrupted execution when
signal-based preemption was attempted. Updating the check will avoid
this kind of problem in the future, in any custom build system, or if the
go command makes a mistake.
After this change:
% sed 3q pkg/darwin_amd64/runtime.a
!<arch>
__.PKGDEF 0 0 0 644 30525 `
go object darwin amd64 devel go1.20-102ebe10b7 Wed Aug 17 14:31:01 2022 -0400 GOAMD64=v1 X:regabiwrappers,regabiargs
%
Rob Pike [Thu, 16 Jun 2022 07:35:05 +0000 (17:35 +1000)]
text/template/parse: simplify I/O in lexing
The concurrent model for delivering tokens was fine for pedagogy,
but has caused a few problems as the package has evolved (that is,
got more complicated). It's easy to eliminate it, simplifying or
removing some of the hacks used to work around these prolems.
The old lexer would deliver tokens over a channel to the parsing
goroutine, and continue running until EOF. In this rewrite, we
instead run the machine until a token is ready, and shut it down
until the next token is needed. The mechanism is just to return nil
as the state function, which requires a bit more threading of return
values through the state functions but is not difficult. The change
is modest.
A couple of error messages change, but otherwise the change has no
external effect. This is just an internal cleanup, long overdue.
benchmark old ns/op new ns/op delta
BenchmarkParseLarge-20 122227296769966 -44.61%
BenchmarkVariableString-20 73.5 73.4 -0.16%
BenchmarkListString-20 1827 1841 +0.77%
benchmark old allocs new allocs delta
BenchmarkVariableString-20 3 3 +0.00%
BenchmarkListString-20 31 31 +0.00%
benchmark old bytes new bytes delta
BenchmarkVariableString-20 72 72 +0.00%
BenchmarkListString-20 1473 1473 +0.00%
Paul E. Murphy [Fri, 21 May 2021 16:26:01 +0000 (11:26 -0500)]
cmd/internal/obj/ppc64: add ISA 3.1 instructions
Use ppc64map (from x/arch) to generate ISA 3.1 support for the
assembler. A new file asm9_gtables.go is added which contains
generated code to encode ISA 3.1 instructions, a function to assist
filling out the oprange structure, a lookup table for the fixed
bits of each instructions, and a slice of string name. Generated
functions are shared if their bitwise encoding match, and the
translation from an obj.Prog structure matches.
The generated file is entirely self-contained, and does not require
regenerating any other files for changes within it. If opcodes in
a.out.go are reordered or changed, anames.go must be updated in
the same way as before.
Future improvements could shrink the generated opcode table
to 32 bit entries as there is much less variation of the
encoding of the prefix word, but it is not always identical
for instructions which share a similar encoding of arguments
(e.g PLWA and PLWZ).
Paul E. Murphy [Mon, 13 Jun 2022 15:59:31 +0000 (10:59 -0500)]
cmd/link: support -fno-plt compiled gcc objects on ppc64le
This is the initial trivial implemenation. Further improvements can be
made for local calls.
A test is added, but the -fno-plt option is ignored by gcc if binutils
does not support inline plt relocations, so the test is effectively
skipped on such hosts.
Joe Tsai [Tue, 13 Sep 2022 17:54:07 +0000 (10:54 -0700)]
time: move RFC 3339 optimizations to separate file
The optimizations were added in CL 425197 and CL 421877.
Move this functionality to a separate file to keep format.go smaller
and to document the justification for why this optimization exists.
Change-Id: I1e4e1ace19f9d596d8c0cf49ab6062f63a87b5bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/430675
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
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Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
Erik Pellizzon [Wed, 14 Sep 2022 10:13:06 +0000 (10:13 +0000)]
hash/crc32: remove redundant code
Merge the CRC32 Update and Write functions using an unexported function, to avoid duplication of code and make it more readable.
The only difference between them is the check of the initialization of the IEEE table, and a boolean value specifies that.
Throughout the crc32.go file, in the switches the default value is inserted inside the switch statement, this change uniforms the style of the MakeTable function, making it like the other pieces of code.
Change-Id: I3889f6c6671210c82f0d7250cea67907bccf3ce7
GitHub-Last-Rev: b8777ee213f2ebad0bb4a5dcdb812fd356d6d086
GitHub-Pull-Request: golang/go#55044
Reviewed-on: https://go-review.googlesource.com/c/go/+/430456
Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Jenny Rakoczy <jenny@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com>
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syscall: use fcntl F_DUP2FD_CLOEXEC in forkAndExecInChild on solaris
Use fcntl(oldfd, F_DUP2FD_CLOEXEC, newfd) to duplicate the file
descriptor and mark is as close-on-exec instead of dup2 & fcntl.
Note that the value for F_DUP2FD_CLOEXEC is different on Solaris and
Illumos and thus the definition is moved from zerrors_solaris_amd64.go
to solaris/illumos specific files.
Change-Id: I9a52801d1a01471ec3f065520575e3fafee92855
Reviewed-on: https://go-review.googlesource.com/c/go/+/428375
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Wayne Zuo [Thu, 15 Sep 2022 07:14:52 +0000 (15:14 +0800)]
cmd/compile: make encoding/binary appends cheaper to inline
Go 1.19 introduce new append-like APIs in package encoding/binary, this
change teaches the inliner to treat calls to these methods as cheap, so
that code using them will be more inlineable.
Updates #42958
Change-Id: Ie3dd4906e285430f435bdedbf8a11fdffce9302d
Reviewed-on: https://go-review.googlesource.com/c/go/+/431015
Auto-Submit: Keith Randall <khr@golang.org>
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Joe Tsai [Mon, 12 Sep 2022 17:15:37 +0000 (10:15 -0700)]
compress/flate: update NewReader documentation
Calling close is no longer necessary.
It was was originally necessary to cleanup goroutines
spawned to decompress the stream.
This has not been the case since CL 4548079.
Update the documentation to mention how it handles trailing data
after the end of the DEFLATE stream.
Change-Id: Ieacba264230560713b7b8d604665223fd096f4ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/430377
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Cherry Mui [Wed, 14 Sep 2022 23:50:00 +0000 (19:50 -0400)]
cmd/link: stop passing -pagezero_size to darwin linker
We added -pagezero_size in CL 72730, where it was intented for iOS.
The current code passes it only on macOS/AMD64 instead. It is not
really necessary there. Also, the new darwin linker starts to emit
a warning about deprecation of the flag. Stop passing it.
For #54482.
Change-Id: If9db7a1645c37d4284e48f075856912df8d8c1a0
Reviewed-on: https://go-review.googlesource.com/c/go/+/430936
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Kévin Dunglas [Tue, 30 Aug 2022 10:18:50 +0000 (10:18 +0000)]
net/http/httputil: forward 1xx responses in ReverseProxy
Support for 1xx responses has recently been merged in
net/http (CL 269997).
As discussed in this CL
(https://go-review.googlesource.com/c/go/+/269997/comments/1ff70bef_c25a829a),
support for forwarding 1xx responses in ReverseProxy has been extracted
in this separate patch.
According to RFC 7231, "a proxy MUST forward 1xx responses unless the
proxy itself requested the generation of the 1xx response".
Consequently, all received 1xx responses are automatically forwarded as long as the
underlying transport supports ClientTrace.Got1xxResponse.
Fixes #26088
Fixes #51914
Change-Id: I3a35ea023b798bfe56b7fb8696d5a49695229cfd
GitHub-Last-Rev: dab8a461fb65b547306cae9b4c664e60020a8fa6
GitHub-Pull-Request: golang/go#53164
Reviewed-on: https://go-review.googlesource.com/c/go/+/409536 Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
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go/types, types2: improve readability of _InvalidUntypedConversion docs
Remove an unnecessary 'an' from errorcodes.go.
Change-Id: Iabe8ce479077cbfff936d57c788a9b39d7e5b34e
Reviewed-on: https://go-review.googlesource.com/c/go/+/430495 Reviewed-by: Robert Findley <rfindley@google.com>
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Anuraag Agrawal [Fri, 10 Jun 2022 05:41:02 +0000 (05:41 +0000)]
strings: reuse the input string for Repeat count of 1
The existing implementation allocates a new string even when the
count is 1, where we know the output is the same as the input.
While we wouldn't expect a count of 1 for hardcoded values of the
parameter, it is expected when the parameter is computed based on
a different value (e.g., the length of a input slice).
Change-Id: I48e08e08f8f6d6914d62b3d6a61d563d637bec59
GitHub-Last-Rev: 068f58e08b8f5c4105e7a210f242ca1ff3a61177
GitHub-Pull-Request: golang/go#53321
Reviewed-on: https://go-review.googlesource.com/c/go/+/411477 Reviewed-by: Ian Lance Taylor <iant@google.com>
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Ian Lance Taylor [Fri, 9 Sep 2022 00:17:55 +0000 (17:17 -0700)]
go/build: remove unnecessary copies of package variables
These variables never change, we don't need second copies of them.
Also rename bPlusBuild to plusBuild, since it is the only remaining
variable with a "b" prefix.
Change-Id: I97089b001d23e9b0f2096e19d9ceed7a9bbb377d
Reviewed-on: https://go-review.googlesource.com/c/go/+/429636
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Ian Lance Taylor [Tue, 10 May 2022 23:16:19 +0000 (16:16 -0700)]
path/filepath: document that WalkDir uses OS paths
Fixes #52812
Change-Id: Idb70d0540bbf9ecdc64293c62a23f07ee3be883c
Reviewed-on: https://go-review.googlesource.com/c/go/+/405615
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Vladimir Varankin [Sat, 10 Sep 2022 20:07:36 +0000 (20:07 +0000)]
net/http: make DefaultTransport docs about HTTP proxy consistent
The changes improve the documentation for DefaultTransport, making
the style with how the HTTP proxy environment variables are being
referred to, consistent with the rest of the project's
documentation.
Also mention HTTPS_PROXY environment variables, as suggested in #32649.