As of CL 438347, multiple concurrents calls to Close should be safe.
This removes some indirection and may also make some programs that use
type-assertions marginally more efficient. For example, if a program
calls (*exec.Cmd).StdinPipe to obtain a pipe and then sets that as the
Stdout of another command, that program will now allow the second
command to inherit the file descriptor directly instead of copying
everything through a goroutine.
This will also cause calls to Close after the first to return an error
wrapping os.ErrClosed instead of nil. However, it seems unlikely that
programs will depend on that error behavior: if a program is calling
Write in a loop followed by Close, then if a racing Close occurs it is
likely that the Write would have already reported an error. (The only
programs likely to notice a change are those that call Close — without
Write! — after a call to Wait.)
Updates #56043.
Updates #9307.
Updates #6270.
Change-Id: Iec734b23acefcc7e7ad0c8bc720085bc45988efb
Reviewed-on: https://go-review.googlesource.com/c/go/+/439195
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Auto-Submit: Bryan Mills <bcmills@google.com>
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Delete some unused code, various cleanups to fix staticcheck warnings.
Change-Id: Ie475d57735a83351a4977f0dd4bc1387ce06a20e
Reviewed-on: https://go-review.googlesource.com/c/go/+/441935
Reviewed-by: David Chase <drchase@google.com>
Fold negation into subtraction and avoid double negation.
This removes around 500 instructions from the Go binary on riscv64.
Change-Id: I4aac6c87baa2a0759b180ba87876d488a23df6d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/431105
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Convert SLT/SLTU with a suitably valued constant into a SLTI/SLTIU instruction.
This can reduce instructions and avoid register loads. Now that we generate
more SLTI/SLTIU instructions, absorb these into branches when it makes sense
to do so.
Removes more than 800 instructions from the Go binary on linux/riscv64.
Change-Id: I42c4e00486697acd4da7669d441b5690795f18ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/428499
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Combine masking with a negative value and zero extension into a single
AND operation.
Change-Id: I0b2a735b696d65568839fc4504445eeac3d869a6
Reviewed-on: https://go-review.googlesource.com/c/go/+/428498
Reviewed-by: Joedian Reid <joedian@golang.org>
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For #56109
Change-Id: I999763e463fac57732a92f5e396f8fa8c35bd2e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/440297
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CL 403995 fixed static init of literal contains dynamic exprs, by
ensuring their init are ordered properly. However, we still need to walk
the generated init codes before appending to parent init. Otherwise,
codes that requires desugaring will be unhandled, causing the compiler
backend crashing.
Fixes#56105
Change-Id: Ic25fd4017473f5412c8e960a91467797a234edfd
Reviewed-on: https://go-review.googlesource.com/c/go/+/440455
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Mark the "l1" and "l2" methods on "arenaIdx" with //go:nosplit, since
these methods are called from a nosplit context (for example, from
"spanOf").
Fixes#56044.
Updates #21314.
Change-Id: I48c7aa756b59a13162c89ef21066f83371ae50f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/441859
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This patch fixes up a bug in the inliner's special case code for
coverage counter updates, which was not properly working for
-covermode=atomic compilations.
Updates #56044.
Change-Id: I9e309312b123121c3df02862623bdbab1f6c6a4b
Reviewed-on: https://go-review.googlesource.com/c/go/+/441858
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
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Use InvalidSyntaxError where the zero error code was used before.
Fix a couple of places that didn't set an error code.
Panic in error reporting if no error code is provided.
Change-Id: I3a537d42b720deb5c351bf38871e04919325e231
Reviewed-on: https://go-review.googlesource.com/c/go/+/439566
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Type checkers should use InvalidSyntaxTree as error code
for invalid syntax tree errors instead of zero. This way
the zero value can be used to mark an unset error code.
Also, add an example for BlankPkgName (and adjust the
test harness slightly to make it work).
Change-Id: Ic15fa0e8e46be698e52352f2f0e4915b75e509d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/439565
Reviewed-by: Robert Findley <rfindley@google.com>
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This change adds a new dependency to go/types.
Change-Id: I7e40b95c8c1e1356b638fc1aa2ef16ce91e9a496
Reviewed-on: https://go-review.googlesource.com/c/go/+/439563
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This avoids a conflict when dot-importing this package in
go/types and types2.
Change-Id: Ia6fc45ef21c28ea595b49f5321b5c0d441763e2b
Reviewed-on: https://go-review.googlesource.com/c/go/+/439562
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The internal/types/errors package defines all error codes used by
the type checkers. This is the 1st step of several that factor out
the error codes from go/types and types2; the package is not yet
used.
- The file codes.go is a copy of go/types/errorcodes.go. The
only change is the updated package name (types -> errors).
- The file codes_test.go is a copy of go/types/errorcodes_test.go
with updated package name (types_test -> errors_test) and minor
changes to walkCodes so that it doesn't require the pkgFiles
helper function (the test only parses a single file).
Change-Id: Idb977b1220737b56b330de1d977f698f022daafc
Reviewed-on: https://go-review.googlesource.com/c/go/+/439560
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If a generic type declaration is missing a constraint, syntactically
it is an array type declaration with an undefined array length.
Mention the possibility of a missing constraint in the error message
for the undefined array length.
For #56064.
For #55961.
For #51145.
Change-Id: Ic161aeda9ea44faa8aa3bf3e9d62b3b13a95d4c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/439559
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Add "-O2" to all compiler/linker tests. This makes compiler/linker
feature probing better resemble actual compiling later.
Why?
----
zig c++ is a clang front-end[1] that accepts, among other things, the
target over the command line. This command:
zig c++ -target x86_64-linux-gnu main.o -o main
Will:
1. Pre-compile libc++.a.
2. Link the program with libc++.a from (1).
Currently Go only is learning about one flag from the linker, that is,
"--no-gc-sections". The resulting command that tests for the flag
support is this:
c++ -Wl,--no-gc-sections -x c - -o
This causes Zig to pre-compile libc++.a in debug mode. Then the actual
compiler+linker command from CGo adds a few more flags, including "-O2":
c++ <...> -Wl,--no-gc-sections -O2 <...>
From Zig perspective, debug-mode libc++.a is different from the
optimized one; that causes Zig to compile a new libc++.a. Specifically,
Zig adds "-fno-omit-frame-pointer" for debug builds, and
"-fomit-frame-pointer" for optimized builds.
As a result, we have to two sets of libc++.a for every arch/os tuple.
That takes CPU time and a bit of disk space.
Zig performance impact
----------------------
First compilation of a simple CGo application is faster by ~2.5 seconds
or ~60%:
$ CC="zig c++ -target x86_64-linux-gnu.2.28" hyperfine \
--warmup 3 --runs 10 \
--prepare 'rm -fr ~/.cache/zig ~/.cache/go-build /tmp/go-*' \
--parameter-list go go1.19,go1.19-O2 \
'/code/go/bin/{go} build .'
Benchmark 1: /code/go/bin/go1.19 build .
Time (mean ± σ): 6.168 s ± 0.059 s [User: 7.465 s, System: 1.578 s]
Range (min … max): 6.111 s … 6.242 s 10 runs
Benchmark 2: /code/go/bin/go1.19-O2 build .
Time (mean ± σ): 3.816 s ± 0.080 s [User: 4.730 s, System: 1.130 s]
Range (min … max): 3.657 s … 3.958 s 10 runs
Summary
'/code/go/bin/go1.19-O2 build .' ran
1.62 ± 0.04 times faster than '/code/go/bin/go1.19 build .'
If we add C++ to the mix, the difference grows to almost ~23 seconds, or
almost 90%:
$ CC="zig c++ -target x86_64-linux-gnu.2.28" hyperfine \
--warmup 1 --runs 3 \
--prepare 'rm -fr ~/.cache/zig ~/.cache/go-build /tmp/go-*' \
--parameter-list go go1.19,go1.19-O2 \
'/code/go/bin/{go} build .'
Benchmark 1: CC="zig c++ -target x86_64-linux-gnu.2.28" /code/go/bin/go1.19 build .
Time (mean ± σ): 51.137 s ± 0.183 s [User: 234.165 s, System: 15.005 s]
Range (min … max): 50.934 s … 51.288 s 3 runs
Benchmark 2: CC="zig c++ -target x86_64-linux-gnu.2.28" /code/go/bin/go1.19-O2 build .
Time (mean ± σ): 27.102 s ± 0.068 s [User: 119.816 s, System: 8.513 s]
Range (min … max): 27.038 s … 27.174 s 3 runs
Summary
'/code/go/bin/go1.19-O2 build .' ran
1.89 ± 0.01 times faster than '/code/go/bin/go1.19 build .'
The difference is just due to the fact that Zig will not be instructed
to compile libc++.a for debug builds; Go doesn't need that.
Non-Zig performance impact
--------------------------
A.k.a. does "-O2" for this check worsen performance?
No statistically significant performance differences with both clang-15
and gcc-11. Also, it affects only the first compile of a CGo progam, as
the linker tests are cached across invocations. go1.19 binary is the
go1.19 tag; go1.19-O2 is go1.19 + this patch.
$ hyperfine --warmup 3 --runs 20 \
--prepare 'rm -fr ~/.cache/go-build/ /tmp/go-*' \
--parameter-list go go1.19,go1.19-O2 \
--parameter-list cc gcc-11,clang-15 \
'CC={cc} /code/go/bin/{go} build .'
Benchmark 1: CC=gcc-11 /code/go/bin/go1.19 build .
Time (mean ± σ): 681.1 ms ± 13.7 ms [User: 501.6 ms, System: 247.1 ms]
Range (min … max): 654.1 ms … 707.2 ms 20 runs
Benchmark 2: CC=gcc-11 /code/go/bin/go1.19-O2 build .
Time (mean ± σ): 676.8 ms ± 10.2 ms [User: 500.4 ms, System: 245.6 ms]
Range (min … max): 664.4 ms … 696.4 ms 20 runs
Benchmark 3: CC=clang-15 /code/go/bin/go1.19 build .
Time (mean ± σ): 860.1 ms ± 17.1 ms [User: 530.0 ms, System: 394.9 ms]
Range (min … max): 839.4 ms … 920.0 ms 20 runs
Benchmark 4: CC=clang-15 /code/go/bin/go1.19-O2 build .
Time (mean ± σ): 864.5 ms ± 26.6 ms [User: 537.8 ms, System: 390.1 ms]
Range (min … max): 841.9 ms … 955.5 ms 20 runs
Summary
'CC=gcc-11 /code/go/bin/go1.19-O2 build .' ran
1.01 ± 0.03 times faster than 'CC=gcc-11 /code/go/bin/go1.19 build .'
1.27 ± 0.03 times faster than 'CC=clang-15 /code/go/bin/go1.19 build .'
1.28 ± 0.04 times faster than 'CC=clang-15 /code/go/bin/go1.19-O2 build .'
cgo.go
------
package main
// #define _FILE_OFFSET_BITS 64
// #include <unistd.h>
// #include <fcntl.h>
// #include <stdio.h>
// char* hello() { return "hello, world"; }
// void phello() { printf("%s, your lucky number is %p\n", hello(), fcntl); }
import "C"
func main() {
C.phello()
}
func Chello() string {
return C.GoString(C.hello())
}
Alternatives considered
-----------------------
There are a few alternatives:
1. Add "-O2" for linker-only tests. That looks like too much catering to
zig alone. If we can add it, then add for everything.
2. Add "-fomit-frame-pointer" instead of "-O2". This flag does not
universally imply debug mode, thus same argument applies as to (1).
3. Add "-O2" for this particular test (`--no-gc-sections`). This is
brittle and not future-proof: a future linker test may omit this
flag.
Hardware
--------
Tested on a 4-core (8 HT) Intel(R) Core(TM) i7-8665U CPU on Debian 11,
Linux 5.10.0-15-amd64.
[1]: https://andrewkelley.me/post/zig-cc-powerful-drop-in-replacement-gcc-clang.html
Change-Id: I5223a5cf53fc5d2b77ac94a6c5712c32c7fbdf36
GitHub-Last-Rev: 2e998b831a
GitHub-Pull-Request: golang/go#55966
Reviewed-on: https://go-review.googlesource.com/c/go/+/436884
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Run "go build ./x" in this workspace:
-- go.work --
use ./y
-- x/go.mod --
module x
go 1.19
-- x/m.go --
package m
It fails with: "go: open /tmp/foo/y/go.mod: no such file or directory".
It's unclear where the name "y" comes from.
This change will emit error like: "go: cannot load module listed in
go.work file: open /tmp/foo/y/go.mod: no such file or directory"
Fixes#55952.
Change-Id: Ia45dd915e3fbd6e33340f352b3d6235c6c31190b
GitHub-Last-Rev: 410de1b4a7
GitHub-Pull-Request: golang/go#56050
Reviewed-on: https://go-review.googlesource.com/c/go/+/438147
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This permits us to safely support concurrent access to files on Plan 9.
Concurrent access was already safe on other systems.
This does introduce a change: if one goroutine calls a blocking read
on a pipe, and another goroutine closes the pipe, then before this CL
the close would occur. Now the close will be delayed until the blocking
read completes.
Also add tests that concurrent I/O and Close on a pipe are OK.
For #50436
For #56043
Change-Id: I969c869ea3b8c5c2f2ef319e441a56a3c64e7bf5
Reviewed-on: https://go-review.googlesource.com/c/go/+/438347
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An older version of go compiling a main module that references a
standard library package from a newer release (e.g. net/netip added in
go 1.18) currently produces a confusing error message. This changes adds
a new error message including go version diagnostics.
Fixes#48966
Change-Id: I1e8319dafcf1f67d1b1ca869fe84190c3b3f3c3e
Reviewed-on: https://go-review.googlesource.com/c/go/+/432075
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With moduleHasRootPackage eliminated in the previous CL, needSum is
now invariantly true at all call sites.
Change-Id: I00e44117e545ea0d3de82604dfa018b013ab8f0c
Reviewed-on: https://go-review.googlesource.com/c/go/+/440296
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This change moves Linux epoll's syscalls implementation to the
"runtime/internal/syscall" package. The intention in this CL was to
minimise behavioural changes but make the code more generalised. This
also will allow adding new syscalls (like epoll_pwait2) without the
need to implement assembly stubs for each arch.
It also drops epoll_create as not all architectures provide this call.
epoll_create1 was added to the kernel in version 2.6.27 and Go requires
Linux kernel version 2.6.32 or later since Go 1.18. So it is safe to
always use epoll_create1.
This is a resubmit as the previous CL 421994 was reverted due to test
failures after the merge with the master. The issue was fixed in
CL 438615
For #53824
For #51087
Change-Id: I1bd0f23a85b4f9b80178c5dd36fd3e95ff4f9648
Reviewed-on: https://go-review.googlesource.com/c/go/+/440115
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AddrFromSlice is not covered by any other test so far.
Change-Id: I91034c6cac95a023fc419c855873a395b1afdab7
Reviewed-on: https://go-review.googlesource.com/c/go/+/435916
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This commit was dedicated to adding an example of using B.ReportMetrics
with B.RunParallel called ExampleB_ReportMetric_parallel. In this
example, the same algorithm for ExampleB_ReportMetric was used, instead
with a concurrent for loop using PB.Next instead of a standard one.
There is also notes noting when to use the B.ReportMetric methods when
running concurrent testing.
Fixes#50756
Change-Id: I2a621b4e367af5f4ec47d38a0da1035a8d52f628
Reviewed-on: https://go-review.googlesource.com/c/go/+/437815
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Replace the ad-hoc approach to running tests in HTTP/1 and HTTP/2
modes with a 'run' function that executes a test in various modes.
By default, these modes are HTTP/1 and HTTP/2, but tests can
opt-in to HTTPS/1 as well.
The 'run' function also takes care of post-test cleanup (running the
afterTest function).
The 'run' function runs tests in parallel by default. Tests which
can't run in parallel (generally because they use global test hooks)
pass a testNotParallel option to disable parallelism.
Update clientServerTest to use t.Cleanup to clean up after itself,
rather than leaving this up to tests to handle.
Drop an unnecessary mutex in SetReadLoopBeforeNextReadHook.
Test hooks can't be set in parallel, and we want the race detector
to notify us if two simultaneous tests try to set a hook.
Fixes#56032
Change-Id: I16be64913c426fc93d84abc6ad85dbd3bc191224
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Move the writev definition for solaris from package
internal/syscall/unix to package syscall. This corresponds to where
writev is defined on aix, darwin and openbsd as well and is
go:linkname'ed from internal/poll. This also allows updating the
generated wrappers more easily if needed.
Change-Id: I671ed8232d25319f8e63f549f786d77a17602148
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Wait or Run will populate its ProcessState when the command completes.
Fixes#56002.
Change-Id: I21547431f5d2d3e0fc0734fd1705421a0ac4209c
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egrep and fgrep are obsolescent now.
This PR updates all egrep and fgrep commands to grep -E and grep -F.
Running egrep/fgrep command with grep v3.8 will output the following warning to stderr:
egrep: warning: egrep is obsolescent; using grep -E
see also:
https://www.phoronix.com/news/GNU-Grep-3.8-Stop-egrep-fgrephttps://lists.gnu.org/archive/html/info-gnu/2022-09/msg00001.html
Change-Id: Iea1ca9ae72264530c67727b5e27cf1b7a362dd97
GitHub-Last-Rev: 3584884bd4
GitHub-Pull-Request: golang/go#55299
Reviewed-on: https://go-review.googlesource.com/c/go/+/432256
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
This cuts the wall duration for 'go test os/exec' and
'go test -race os/exec' roughly in half on my machine,
which is an even more significant speedup with a high '-count'.
For better or for worse, it may also increase the repro rate
of #34988.
Tests that use Setenv or Chdir or check for FDs opened during the test
still cannot be parallelized, but they are only a few of those.
Change-Id: I8d284d8bff05787853f825ef144aeb7a4126847f
Reviewed-on: https://go-review.googlesource.com/c/go/+/439196
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
This test has been disabled for over nine years (since CL 12869049).
Although it still compiles, it seems likely to have rotted since then,
and if it was going to detect a real bug it also seems like that bug
would have been encountered and reported by users since then (and
would presumably have its own regression tests).
To eliminate overhead from mainining it (or skipping over it while
maintaining other tests), let's just delete it.
Fixes#5780.
Change-Id: I2a85cba20cba98a1dc6fc82336ae5e22d2242e99
Reviewed-on: https://go-review.googlesource.com/c/go/+/439197
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
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In practice this only shows up when a vendored package, imported on the
command line, imports an internal package.
Change-Id: I34c161d1f1ef15a87c58a422f17d11f77fbac53f
Reviewed-on: https://go-review.googlesource.com/c/go/+/439735
Run-TryBot: Michael Matloob <matloob@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
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Reviewed-by: Bryan Mills <bcmills@google.com>
When it calculates the smallest n such that:
n >= i && n % buildInfoAlign == 0
the expression should be
(i+buildInfoAlign-1)&^(buildInfoAlign-1)
instead of
(i+buildInfoAlign-1)&^buildInfoAlign
Fixes#54968.
Change-Id: Ibb7bdf568a521545b2609acc85e2ab4e05da5dae
GitHub-Last-Rev: 479ebc140a
GitHub-Pull-Request: golang/go#54971
Reviewed-on: https://go-review.googlesource.com/c/go/+/429815
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
For example:
movb a0, a0
srai $1, a0, a0
the assembler will expand to:
slli $56, a0, a0
srai $56, a0, a0
srai $1, a0, a0
this CL optimize to:
slli $56, a0, a0
srai $57, a0, a0
Remove 270+ instructions from Go binary on linux/riscv64.
Change-Id: I375e19f9d3bd54f2781791d8cbe5970191297dc8
Reviewed-on: https://go-review.googlesource.com/c/go/+/428496
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Change-Id: I375233dc700adbc58a6d4af995d07b352bf85b11
GitHub-Last-Rev: ef12920523
GitHub-Pull-Request: golang/go#55994
Reviewed-on: https://go-review.googlesource.com/c/go/+/437715
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
This fixes a bug introduced by CL 426094 that caused the
golang.org/x/website/internal/web tests to fail.
Fixes#56034
Change-Id: Ic64967c6d440ad260b7283a18972b20023320ab6
Reviewed-on: https://go-review.googlesource.com/c/go/+/437976
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Change-Id: I6be77e7b7c919f26bed7b6690cce6741888ba78a
GitHub-Last-Rev: 4ef4a7b425
GitHub-Pull-Request: golang/go#56051
Reviewed-on: https://go-review.googlesource.com/c/go/+/438991
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
