Cherry Mui [Fri, 12 Sep 2025 17:46:31 +0000 (13:46 -0400)]
cmd/link: support race mode with MSVC clang
I couldn't make --print-file-name work with -msvc clang. (The
library name is synchronization.lib, but even with that name it
still doesn't print the full path.) Assume it always
synchronization.lib.
Change-Id: I22e8f14824f7f7e96b71b913217b1f604f1e2da7
Reviewed-on: https://go-review.googlesource.com/c/go/+/703398 Reviewed-by: Than McIntosh <thanm@golang.org> Reviewed-by: Florian Zenker <floriank@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
test/codegen: check zerobase for newobject on 0-sized types
This CL also adds riscv64 checks
Change-Id: I693e4e606f470615f6b49085592d6d5ca61473d3
Reviewed-on: https://go-review.googlesource.com/c/go/+/703716 Reviewed-by: Pengcheng Wang <wangpengcheng.pp@bytedance.com>
Auto-Submit: Keith Randall <khr@google.com> Reviewed-by: Mark Freeman <markfreeman@google.com> Reviewed-by: Joel Sing <joel@sing.id.au>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@google.com>
qmuntal [Tue, 26 Aug 2025 09:47:51 +0000 (11:47 +0200)]
runtime: deduplicate syscall assembly for darwin
The darwin port provides different syscall functions that only
differ on how they handle the errors, and they are all written
in assembly.
This duplication can be removed by factoring out the error handling
logic to arch-agnostic Go code and leaving the assembly functions
with the only reponsibility of making the syscall and mapping
parameters between ABIs.
Updates #51087
Cq-Include-Trybots: luci.golang.try:gotip-darwin-arm64-longtest,gotip-darwin-amd64-longtest
Change-Id: I9524377f3ef9c9a638412c7e87c8f46a33ee3453
Reviewed-on: https://go-review.googlesource.com/c/go/+/699135 Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Mark Freeman <markfreeman@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
database64128 [Wed, 27 Aug 2025 09:38:13 +0000 (17:38 +0800)]
net: use context.AfterFunc in connect
This saves a goroutine when ctx can be but is not canceled during
the connect call.
The redundant fd.Close() call is removed, because the caller closes
the fd on error.
Change-Id: I124d7e480294a48ef74d5650d8ef0489bdfc64d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/699256
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Sean Liao <sean@liao.dev> Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Sean Liao <sean@liao.dev> Reviewed-by: Mark Freeman <markfreeman@google.com>
Alan Donovan [Thu, 11 Sep 2025 15:02:03 +0000 (11:02 -0400)]
cmd/go/internal/work: copy vet tool's stdout to our stdout
The go command connects both the stdout and stderr files of
its child commands (cmd/compile, cmd/vet, etc) to the go
command's own stderr. If the child command is supposed to
produce structure output on stderr, as is the case for
go vet -json or go fix -diff, it will be merged with the
error stream, making it useless.
This change to the go vet <-> unitchecker protocol specifies
the name of a file into which the vet tool should write its
stdout. On success, the go command will then copy the entire
content of that file to its own stdout, under a lock.
This ensures that partial writes to stdout in case of failure,
concurrent writes to stdout by parallel vet tasks, or other
junk on stderr, cannot interfere with the integrity of the
go command's structure output on stdout.
CL 702835 is the corresponding change on the x/tools side.
For #75432
Change-Id: Ib4db25b6b0095d359152d7543bd9bf692551bbfa
Reviewed-on: https://go-review.googlesource.com/c/go/+/702815
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Matloob <matloob@google.com>
Auto-Submit: Alan Donovan <adonovan@google.com>
Cherry Mui [Fri, 12 Sep 2025 16:36:38 +0000 (12:36 -0400)]
cmd/link: don't count tbss section in TestFlagD
TestFlagD looks for a data-like section at the lowest address.
On OpenBSD, the .tbss section matches the current condition, which
has address 0, causing the test fail. Don't count TLS sections.
Also, print the section name on error.
Fixes #75444.
Change-Id: Ic0aa1a2bb7c6bd5c0023d4482405a482095ff68b
Reviewed-on: https://go-review.googlesource.com/c/go/+/703375 Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This fires in just one place; stkframe.go's stkobjinit. But, it does
make the struct literal entirely constants.
Change-Id: Ice76cb3cddd97adee011fdaab40597839da2e89f
Reviewed-on: https://go-review.googlesource.com/c/go/+/701300 Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Mark Freeman <markfreeman@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
cmd/compile, reflect: further allow inlining of TypeFor
Previous CLs optimized direct use of abi.Type, but reflect.Type is
indirected, so was not benefiting.
For TypeFor, we can use toRType directly without a nil check because the
types are statically known.
Normally, I'd think SSA would remove the nil check, but due to some
oddity (specifically, late fuse being required to remove the nil check,
but opt doesn't run that late) means that the nil check persists and
gets in the way.
Manually writing the code in this instance seems to fix the problem.
It also exposed another problem; depending on the ordering, writeType
could get to a type symbol before SSA, thereby preventing Extra from
being created on the symbol for later lookups that don't go through
TypeLinksym directly. In writeType, for non-shape types, call
TypeLinksym to ensure that the type is set up for later callers. That
change itself passed toolstash -cmp.
All up, this stack put through compilecmp shows a lot of improvement in
various reflect-using packages, and reflect itself. It is too big to fit
in the commit message but here's some info:
compilecmp master -> HEAD
master (d767064170): cmd/compile: mark abi.PtrType.Elem sym as used
HEAD (846a94c568): cmd/compile, reflect: further allow inlining of TypeFor
Change-Id: I9eb750cf0b7ebf532589f939431feb0a899e42ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/701301 Reviewed-by: Mark Freeman <markfreeman@google.com> Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com> Reviewed-by: Keith Randall <khr@golang.org>
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Michael Matloob [Mon, 17 Mar 2025 15:45:52 +0000 (11:45 -0400)]
internal/goexperiment: add a sizespecializedmalloc goexperiment setting
Change-Id: I6a6a696497f2a0b0d403bbb11d7502f62edec78b
Reviewed-on: https://go-review.googlesource.com/c/go/+/696535
Auto-Submit: Michael Matloob <matloob@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Michael Matloob <matloob@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Cherry Mui [Thu, 11 Sep 2025 21:42:30 +0000 (17:42 -0400)]
cmd/link: support MSVC clang
Currently on Windows, for cgo, we support MinGW-based C toolchain,
that is, with a -windows-gnu target. This CL makes it work with
clang with a -windows-msvc target. The LLVM toolchain bundled in
MSVC (https://learn.microsoft.com/en-us/cpp/build/clang-support-msbuild)
is such an example.
Currently it is expecting lld-link as the C linker, which is also
bundled in MSVC, can be requested with -fuse-ld=lld, but is not
the default.
This is the first step, which makes it generate a working cgo
binary. There are still more work to do, e.g. there are some
linker warnings, and the binary doesn't have symbol table.
all.bat doesn't pass with this setting.
Change-Id: I54d33f7dd5f5eeeafa0735cd52f4127fe4865636
Reviewed-on: https://go-review.googlesource.com/c/go/+/703055 Reviewed-by: Than McIntosh <thanm@golang.org> Reviewed-by: Florian Zenker <floriank@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Support is added for the generic RISC-V CSR operations; CSRRC, CSRRCI,
CSRRS, CSRRSI, CSRRW, CSRRWI. These instructions require special
handling as their second operand is a symbolic CSR register name and
not an immediate value or a register. CSR names are implemented as
special operands.
RISC-V CSRs are not currently saved and restored when a go routine is
asynchronously pre-empted so it is only safe to use these instructions
in hand written assembler. Note that CSRRS was already partially
supported by the assembler so this restriction predates this commit.
We mention it here as this commit makes CSRRS much easier to use.
Change-Id: I9ff8d804328b418a879d463e7d9cc31f489c7a00
Reviewed-on: https://go-review.googlesource.com/c/go/+/630519 Reviewed-by: Junyang Shao <shaojunyang@google.com> Reviewed-by: Joel Sing <joel@sing.id.au>
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Michael Matloob [Fri, 8 Aug 2025 21:35:43 +0000 (17:35 -0400)]
cmd/go: run cgo and cgo compiles in their own actions
This change splits package builds further into even more actions.
Between the cache action (and cover action, if present) and the actual
build action we insert three layers of actions:
Check Cache Action
| |
| V
| Run Cover Action (if cover requested)
| |
| V
New Layer 1 | Run Cgo Action (if package is built with cgo)
| | | | (multiple arrows representing fan-out to
| V V V multiple actions)
New Layer 2 | gcc Compile Action for each C/C++/S/F/M file (if cgo)
| |/ (arrow represeting fan-in to single action)
| V
New Layer 3 | Cgo collect action (if cgo)
| |
\ V
Build action
The first run cgo action takes the input source files and runs cgo on
them to produce the cgo-processed go files, which are given to the
compiler, and to produce additional C files to compile and headers to
use in the following compilations. The action also takes care of running
SWIG before running cgo if there are swig files. This will produce
additional cgo sources that are inputs to cgo.
The run cgo action action fans out to multiple actions to do each of the
C/C++/Obj-C/assembly/Fortran compilations for the non-Go files in the
package, as well as those produced as outputs by the cgo command
invocation.
These actions then join into a single noop "collect" action which
primarily exists so that we don't pollute the build action's
dependencies with a bunch of non-go compile actions. (The build action
expects its dependencies to mostly be other build actions).
All of this work in the new actions was previously being done in the
build action itself. There's still a remnant of the original cgo logic
left in the build action to run the cgo command with -dynimport to
produce a go file to be built with the rest of the package, and do some
checks.
Most of this CL consists of moving code around. Just like the previous
CL breaking out the coverage logic into a separate action, we don't
cache the outputs of the cgo actions, and just treat all the actions
used to build a single package as one cacheable unit. This makes things
a bit simpler. If we decide in a future CL to cache the outputs
separately, we could remove the dependency on the cover action on the
check cache action (which in turn depends on all the package's
dependencies) and could start non-go compilation pretty much as early as
we want in the build.
The 'cgoAction' function in action.go takes care of creating the layers
of cgo action dependencies, which are inserted as dependencies of the
build action. It's mostly straightforward, except for the fact that we
need to tell each non-go compile action which non-go file to compile, so
we need to compute the names of the generated files. (Alternatively we
could give each action a number and have it build the nth file produced
by the run cgo action, but that seems even more complicated). The actors
produced to run the action logic are pretty light wrappers around the
execution logic in exec.go.
In the 'build' function in exec.go, most of the new code mainly checks
for the information from the cgo actions to use instead of running it,
and then passes it to the processCgoOutputs function. The only other
weird thing in the build functian is that we we call the logic to
compute the nonGoOverlay separately just for the C files that are being
built with gccgo. We compute the overlay for the non-go files used in a
cgo build in the run cgo action.
The 'cgo' function that previously ran the cgo logic for the build has
now been split into three: the first half, which runs cgo is now in the
runCgo function, the center part, which compiles the non-go files is now
partly in creating the invididual non-go compile actions, as well as the
cgoCompileActor's Act function. And the final part, which runs
cgo -dynimport is now in processCgoOutputs. These parts communicate with
each other through the providers that are set on the cgo actions.
One further improvement we can make to this change in the future is to
compile the dynimport file separately from the build action: its output
is only needed by the linker. This would remove any dependencies from
dependent packages' build actions on the cgo compile actions, allowing
more flexibility for scheduling actions.
Fixes #9887
Change-Id: Ie3c70bbf985148ba73094cddfc78c39dc6faad6e
Reviewed-on: https://go-review.googlesource.com/c/go/+/694475 Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Matloob <matloob@google.com>
David Finkel [Sun, 31 Aug 2025 17:34:47 +0000 (13:34 -0400)]
testing: exit B.Loop early upon saturation
There's a cap of 1 billion benchmark iterations because more than that
is usually not going to give more useful data. Unfortunately, the
existing implementation neglected to check whether the 1e9 cap had
already been exceeded when it adjusted the number of iterations in the
B.Loop slow path (stopOrScaleBLoop), since it's only when that cap is hit
that it needed to terminate early.
As a result, for _very_ cheap benchmarks (e.g. testing assembly
implementations with just a few instructions), the B.Loop would stop
incrementing the number of iterations, but wouldn't terminate early,
making it re-enter the slow-path _every_ iteration until the benchmark
time was exhausted.
This wasn't normally visible with the default -benchtime 2s, but when
raised to 5s, it would cause benchmarks that took <5ns/op to be reported
as exactly 5ns/op. (which looks a bit suspicious)
Notably, one can use -count for larger groupings to compute statistics.
golang.org/x/perf/cmd/benchstat is valuable for coalescing larger
run-counts from -count into more useful statistics.
Add a test which allows for fewer iterations on slow/contended
platforms but guards against reintroducing a bug of this nature.
Fixes #75210
Change-Id: Ie7f0b2e6c737b064448434f3ed565bfef8c4f020
Reviewed-on: https://go-review.googlesource.com/c/go/+/700275 Reviewed-by: Junyang Shao <shaojunyang@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Damien Neil <dneil@google.com> Reviewed-by: Sean Liao <sean@liao.dev>
Auto-Submit: Sean Liao <sean@liao.dev>
Alan Donovan [Thu, 11 Sep 2025 17:40:24 +0000 (13:40 -0400)]
cmd/go/internal/work: remove deps[1]="fmt" vet hack
The Builder.vet operation has not needed an artificial
dependency on the fmt package since CL 176439 in 2019.
Remove it now.
Change-Id: I398a6d2d57175c12843520d9f19ffd023e676123
Reviewed-on: https://go-review.googlesource.com/c/go/+/702856
Auto-Submit: Alan Donovan <adonovan@google.com> Reviewed-by: Michael Matloob <matloob@golang.org> Reviewed-by: Michael Matloob <matloob@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Joe Tsai [Wed, 10 Sep 2025 00:24:20 +0000 (17:24 -0700)]
archive/tar: fix typo in benchmark name
This was accidentally introduced in CL 662835.
Change-Id: I5c7ac67337e33e82037414377912b57d2a45be91
Reviewed-on: https://go-review.googlesource.com/c/go/+/702275 Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Mark Freeman <markfreeman@google.com>
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Dmitri Shuralyov [Wed, 10 Sep 2025 19:08:27 +0000 (15:08 -0400)]
syscall: actually remove unreachable code
CL 702415 claimed to remove unreachable code, but in reality merely hid
it from vet's unreachable pass. Since the unreachable code isn't serving
an active role in the test, do remove it to simplify code.
Change-Id: I5905b8b566e4ca013bdd1202d1492e3eae6a5ede
Reviewed-on: https://go-review.googlesource.com/c/go/+/702575 Reviewed-by: Ian Lance Taylor <iant@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Mark Freeman <markfreeman@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
debug/macho: filter non-external symbols when reading imported symbols without LC_DYSYMTAB
File.ImportedSymbols will return symbols with a type that has one of the
N_STAB (0xe0) bits set and no section. That's not the expected behavior,
as those symbols might not be external.
We should expand the type check to also account for the N_EXT bit.
The section check is not necessary, as N_EXT symbols never have it set.
I have found this issue in the wild by running "go tool cgo -dynimport",
but unfortuantely I couldn't get a minimal C code that generates
N_STAB symbols without section, so this CL doesn't add any new test.
Change-Id: Ib0093ff66b50c7cc2f39d83936314fc293236917
Reviewed-on: https://go-review.googlesource.com/c/go/+/702296 Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Keith Randall [Thu, 21 Aug 2025 00:33:14 +0000 (17:33 -0700)]
runtime/internal/maps: only conditionally clear groups when sparse
We only want to do the work of clearing slots
if they are full. But we also don't want to do too
much work to figure out whether a slot is full or not,
especially if clearing a slot is cheap.
1) We decide group-by-group instead of slot-by-slot.
If any slot in a group is full, we zero the whole group.
2) If groups are unlikely to be empty, don't bother
testing for it.
3) If groups are 50%/50% likely to be empty, also don't
bother testing, as it confuses the branch predictor. See #75097.
4) But if a group is really large, do the test anyway, as
clearing is expensive.
Fixes #75097
Change-Id: I9191865dd3e0fe887751cffe6082ac27d8d8439c
Reviewed-on: https://go-review.googlesource.com/c/go/+/697876 Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Keith Randall <khr@google.com> Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Youlin Feng <fengyoulin@live.com>
Change-Id: I69adff73d1c9631e07df63fc84c80ec0204d49d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/700835 Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
TestReadMetricsSched/running can take some time to enter in steady state
on busy systems. We currently only allow 1 second for that, we should
let it run unlimitedly until success or the test time's out.
Fixes #75049
Change-Id: I452059e1837caf12a2d2d9cae1f70a0ef2d4f518
Reviewed-on: https://go-review.googlesource.com/c/go/+/702295
Auto-Submit: Damien Neil <dneil@google.com> Reviewed-by: Damien Neil <dneil@google.com>
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Keith Randall [Fri, 5 Sep 2025 17:19:17 +0000 (10:19 -0700)]
cmd/compile: when CSEing two values, prefer the statement marked one
Fixes #75249
Change-Id: Ifd61bf5341f23ce2c9735e607e00d987489caacf
Reviewed-on: https://go-review.googlesource.com/c/go/+/701295 Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Alexander Musman <alexander.musman@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reason for revert: Causes miscompilations. See issue 75365.
Change-Id: Icd1fcfeb23d2ec524b16eb556030f43875e1c90d
Reviewed-on: https://go-review.googlesource.com/c/go/+/702455 Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Mark Freeman <markfreeman@google.com>
Dmitri Shuralyov [Wed, 10 Sep 2025 14:55:19 +0000 (10:55 -0400)]
go/token, syscall: annotate if blocks that defeat vet's unreachable pass
Since putting code in an "if true" block is unusual, make it easier
for readers to understand the purpose of doing this.
For #73998.
Change-Id: I3fd8d65130211c7c01d424366a3c662482d80add
Reviewed-on: https://go-review.googlesource.com/c/go/+/702416 Reviewed-by: Alan Donovan <adonovan@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Revert "crypto/internal/fips140: update frozen module version to "v1.0.0""
This reverts CL 701518. This should land just before CL 701520 to avoid
breaking the builders for long.
Fixes #75343
Change-Id: If1ae1fe933fe443ca9776888967d80875b02f41a
Reviewed-on: https://go-review.googlesource.com/c/go/+/702255 Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Joe Tsai [Tue, 9 Sep 2025 00:33:47 +0000 (17:33 -0700)]
encoding/json/v2: document context annotation with SemanticError
When the json package calls
Marshaler, MarshalerTo, Unmarshaler, or UnmarshalerFrom methods
and a SemanticError is returned, it will automatically
annotate the error with context.
Document this behavior.
Change-Id: Id8e775a7c1c2a6ffc29ea518913591915e8aff87
Reviewed-on: https://go-review.googlesource.com/c/go/+/701956 Reviewed-by: Damien Neil <dneil@google.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Ian Lance Taylor [Sat, 6 Sep 2025 05:24:37 +0000 (22:24 -0700)]
runtime: when using cgo on 386, call C sigaction function
On 386 the C sigaction function assumes that the caller does not set
the SA_RESTORER flag. It does not copy the C sa_restorer field to
the kernel sa_restorer field. The effect is that the kernel sees
the SA_RESTORER flag but a NULL sa_restorer field, and the program
crashes when returning from a signal handler.
On the other hand, the C sigaction function will return the SA_RESTORER
flag and the sa_restorer field stored in the kernel.
This means that if the Go runtime installs a signal handler,
with SA_RESTORER as is required when calling the kernel,
and the Go program calls C code that calls the C sigaction function
to query the current signal handler, that C code will get a result
that it can't pass back to sigaction.
This CL fixes the problem by using the C sigaction function
for 386 programs that use cgo. This reuses the functionality
used on amd64 and other GOARCHs to support the race detector.
See #75253, or runtime/testdata/testprogcgo/eintr.go, for sample
code that used to fail on 386. No new test case is required,
we just remove the skip we used to have for eintr.go.
Fixes #75253
Change-Id: I803059b1fb9e09e9fbb43f68eccb6a59a92c2991
Reviewed-on: https://go-review.googlesource.com/c/go/+/701375
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Auto-Submit: Ian Lance Taylor <iant@golang.org>
Change-Id: I987d9f49fbd2650eef4224f72271bf752c54d39c
Reviewed-on: https://go-review.googlesource.com/c/go/+/700538 Reviewed-by: Mark Freeman <markfreeman@google.com> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com>
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Change-Id: I43681ca029880025558b33ddc4295da3947c9b28
Reviewed-on: https://go-review.googlesource.com/c/go/+/700537
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Change-Id: Iea1da734ff8eaf1b5a2822ae2bdb7f4fd9b65651
Reviewed-on: https://go-review.googlesource.com/c/go/+/699635 Reviewed-by: Mark Ryan <markdryan@rivosinc.com> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@golang.org>
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Meng Zhuo [Mon, 18 Aug 2025 09:59:43 +0000 (17:59 +0800)]
cmd/compile: simplify zerorange on riscv64
Drop large zeroing cases, part of removing duff support.
Change-Id: Ia2936f649901886f3eb1d7ba1f90e3bf40ea2dee
Reviewed-on: https://go-review.googlesource.com/c/go/+/697615 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Julian Zhu <jz531210@gmail.com> Reviewed-by: Mark Ryan <markdryan@rivosinc.com> Reviewed-by: Keith Randall <khr@google.com>
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matloob [Mon, 25 Aug 2025 21:22:01 +0000 (17:22 -0400)]
cmd/cgo: run gcc to get errors and debug info in parallel
This change kicks off the work to load the debug info when processing
each file, and then waits for all the files to be processed before
starting the single-goroutined part that processes them. The processing
is very order dependent so we won't try to make it concurrent. Though
in a later CL we can wait for only the relevant package to have been
processed concurrently before doing the single-goroutined processing for
it instead of waiting for all packages to be processed concurrently
before the single goroutine section.
We use a par.Queue to make sure we're not running too many gcc compiles
at the same time. The change to cmd/dist makes the par package available
to cgo.
Fixes #75167
Change-Id: I6a6a6964fb7f3a3684118b5ee66f1ad856b3ee59
Reviewed-on: https://go-review.googlesource.com/c/go/+/699020 Reviewed-by: Michael Matloob <matloob@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Michael Pratt <mpratt@google.com>
For programs with very large environments, calling unsetenv(3) for each
environment variable can be very expensive because of CGo overhead, but
clearenv(3) is much faster. The only thing we have to track is whether
GODEBUG is being unset by the operation, which can be done very quickly
without resorting to doing unsetenv(3) for every variable.
This change makes syscall.Clearenv() >98% faster when run in an
environment with as little as 100 environment variables. (Note that due
to golang/go#27217, it is necessary to modify BenchmarkClearenv to use
t.StopTimer() and -benchtime=100x in order to get these benchmark times
-- otherwise syscall.Setenv() time is included and the benchmarks give a
more pessimistic 50% performance improvement.)
The above benchmarks are CGo builds, which require CGo overhead for
every setenv(2). If you run the same benchmarks for a non-CGo package
(i.e., outside of the "syscall" package), you get slightly more modest
performance improvements:
When slicing, ignore expressions which could be elided, as in slicing
starting at 0 or ending at len(v).
Fixes #75278
Change-Id: I9c18e29c3d4da9bef89bd25bb261d3cb60e66392
Reviewed-on: https://go-review.googlesource.com/c/go/+/701216
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Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Mark Freeman <markfreeman@google.com>
Change-Id: I510a80d59cf78680b57d68780d35d212d24030e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/700816 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com>
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Auto-Submit: Keith Randall <khr@golang.org>
Melnikov Denis [Thu, 21 Aug 2025 15:00:57 +0000 (18:00 +0300)]
cmd/compile: improve stp merging for non-sequent cases
Original algorithm merges stores with the first
mergeable store in the chain, but it misses some
cases. Additional reordering stores in increasing order
of memory access in the chain allows merging in these cases.
Fixes #71987
There are the results of sweet benchmarks and
the difference between sizes of sections .text
Change-Id: Ieb4fdfd656aca458f65fc45938de70550632bd13
Reviewed-on: https://go-review.googlesource.com/c/go/+/698097 Reviewed-by: Keith Randall <khr@golang.org>
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Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Mark Freeman <markfreeman@google.com> Reviewed-by: Keith Randall <khr@google.com>
cmd/compile: use constant zero register instead of specialized zero instructions on mips64x
Refer to CL 633075, mips64x has a constant zero register that can be used to do this.
Change-Id: I7b60f9a9fe0015299f48b9219ba0eddd3c02e07a
Reviewed-on: https://go-review.googlesource.com/c/go/+/700935
Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com>
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Ch1n-ch1nless [Thu, 21 Aug 2025 14:41:13 +0000 (17:41 +0300)]
cmd/compile: introduce CCMP generation
Introduce new aux type "ARM64ConditionalParams", which contains condition code, NZCV flags and constant with indicator of using it for CCMP instructions
Updates #71268
Change-Id: I322a6cb7077c9a2c4415893c5eb7ff7692d5a2de
Reviewed-on: https://go-review.googlesource.com/c/go/+/698037 Reviewed-by: Mark Freeman <markfreeman@google.com> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com>
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Auto-Submit: Keith Randall <khr@golang.org>
matloob [Mon, 18 Aug 2025 20:41:06 +0000 (16:41 -0400)]
cmd/go: split generating cover files into its own action
This change breaks up the build action into multiple actions: a first
action checks to see what's cached and determines what the following
actions need to do. Then the optional cover action will generate cover
instrumented files if this is a cover build. Finally the build action
does the rest of this work. For simplicity of implementation, the new
actions do not cache their outputs separately from the build action
itself. It might be better to make changes in future CLs to enable that,
but it does add a reasonable amount of complexity. The purpose of this
CL is to split up the cover and build actions, so that in the next CL we
can insert cgo actions in the middle to enable running the cgo compile
actions in parallel.
For #9887
Change-Id: I6a6a696459feade17a144e5341096475676ae99f
Reviewed-on: https://go-review.googlesource.com/c/go/+/697135 Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Matloob <matloob@google.com>
cmd/compile: fold constant in ADDshift op on loong64
Removes 918 instructions from the go binary on loong64.
file before after Δ
go 16331201632948 -172
gofmt 323470 323334 -136
asm 568024 568024 -0
cgo 488030 487890 -140
compile 25010502500728 -322
cover 530124 530124 -0
link 723532 723520 -12
preprofile 240568 240568 -0
vet 819392 819256 -136
Change-Id: Id4015c66b2073323b7ad257b3ed05bb99f81e9a1
Reviewed-on: https://go-review.googlesource.com/c/go/+/701655
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Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Mark Freeman <markfreeman@google.com>
cmd/compile: optimize loads from abi.Type.{Size_,PtrBytes,Kind_}
With the previous CL in place, we can now pretty easily optimize a few
more loads from abi.Type. I've done Size_, PtrBytes, and Kind_, which
are easily calculated.
Among std/cmd, this rule fires a number of times:
75 abi.Type field Kind_
50 abi.PtrType field Elem
14 abi.Type field Hash
4 abi.Type field Size_
2 abi.Type field PtrBytes
The other ones that show up when compiling std/cmd are TFlag and GCData,
but these are not trivially calculated. Doing TFlag would probably be a
decent help given it's often used in things like switches where
statically knowing the kind could eliminate a bunch of dead code.
Change-Id: Ic7fd2113fa7479af914d06916edbca60cc71819f
Reviewed-on: https://go-review.googlesource.com/c/go/+/701298 Reviewed-by: Mark Freeman <markfreeman@google.com> Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
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cmd/compile: consolidate logic for rewriting fixed loads
Many CLs have worked with this bit of code, extending the cases more and
more for various fixed addresses and constants. But, I find that it's
getting duplicitive, and I don't find the current setup very clear that
something like isFixed32 _only_ works for a specific element within the
type data.
This CL rewrites these rules (pun unintended) into a single set of
rewrite rules with shared logic, which stops hardcoding offsets and type
compatibility checks.
This should open the door to optimizing further type:... field loads, of
which most can be done entirely statically but are not yet today outside
Hash and Elem.
Passes toolstash -cmp.
Change-Id: I754138ce1785c6036eada9ed53f0ce2ad2a58b63
Reviewed-on: https://go-review.googlesource.com/c/go/+/701297 Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
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Change-Id: I9feffa3906f1e1e9fd54f24113130322411cc9d4
Reviewed-on: https://go-review.googlesource.com/c/go/+/701155
Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Mark Freeman <markfreeman@google.com> Reviewed-by: Keith Randall <khr@golang.org>
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matloob [Mon, 25 Aug 2025 21:16:05 +0000 (17:16 -0400)]
cmd/cgo: run recordTypes for each of the debugs at the end of Translate
Save the debug information in a slice and then process all of them at
the end of the loop.
For #75167
Change-Id: I6a6a6964dffa784b0aa776334562333ecf247023
Reviewed-on: https://go-review.googlesource.com/c/go/+/699019
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Ian Lance Taylor [Mon, 1 Sep 2025 16:18:08 +0000 (09:18 -0700)]
debug/pe: permit symbols with no name
They are reportedly generated by llvm-mingw clang21.
Fixes #75219
Change-Id: I7fa7e13039bc7eee826cc19826985ca0e357a9ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/700137 Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Michael Pratt <mpratt@google.com>
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Auto-Submit: Ian Lance Taylor <iant@golang.org>
encoding/json/internal/jsonflags: fix comment with wrong field name
Flags struct has field Values but in the comments use Value.
Fix it to correct name Values.
Change-Id: Ib47e62538599a788c69fda27a7e2a97b8cf73263
Reviewed-on: https://go-review.googlesource.com/c/go/+/701415 Reviewed-by: Joseph Tsai <joetsai@digital-static.net> Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
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Richard Miller [Thu, 4 Sep 2025 10:42:56 +0000 (11:42 +0100)]
os: reject OpenDir of a non-directory file in Plan 9
Check that the path argument to OpenDir in Plan 9 is a directory,
and return error syscall.ENOTDIR if it is not.
Fixes #75196
Change-Id: I3bec6b6b40a38c21264b5d22ff3e7dfbf8c1c6d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/700855 Reviewed-by: Damien Neil <dneil@google.com>
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database64128 [Fri, 29 Aug 2025 09:52:54 +0000 (17:52 +0800)]
crypto/tls: use context.AfterFunc in handshakeContext
This saves a goroutine when ctx can be canceled but is not canceled
during the handshakeContext call.
Use ctx consistently, because in this path (c.quic == nil) handshakeCtx
will only be canceled when ctx is canceled.
Change-Id: I7f4565119f30d589dce026b0d7ef3c324220525a
Reviewed-on: https://go-review.googlesource.com/c/go/+/699895 Reviewed-by: Roland Shoemaker <roland@golang.org>
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Change-Id: I02e5d4bedf131e491f1a262aa3cbc0896cbc9488
Reviewed-on: https://go-review.googlesource.com/c/go/+/700817
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CL 700336 let the compiler see into the abi.PtrType.Elem field,
but forgot the MarkTypeSymUsedInInterface to ensure that the symbol
is marked as referenced.
I am not sure how to write a test for this, but I noticed this when
working on further optimizations where I "fixed" this issue and
confusingly failed toolstash -cmp, with diffs like:
Change-Id: Ib8de8a32aeb8a7ea6fcf5d728a2e4944ef227ab2
Reviewed-on: https://go-review.googlesource.com/c/go/+/701296
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Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Keith Randall <khr@google.com>
cmd/compile: simplify specific addition operations using the ADDV16 instruction
On loong64, the addi.d instruction can only directly handle 12-bit
immediate numbers. If a larger immediate number needs to be processed,
it must first be placed in a register, and then the add.d instruction
is used to complete the processing of the larger immediate number.
If a larger immediate number c satisfies is32Bit(c) && c&0xffff == 0,
then the ADDV16 instruction can be used to complete the addition operation.
Removes 164 instructions from the go binary on loong64.
Change-Id: I404de93cc4eaaa12fe424f5a0d61b03231215d1a
Reviewed-on: https://go-review.googlesource.com/c/go/+/700536 Reviewed-by: Meidan Li <limeidan@loongson.cn> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com> Reviewed-by: abner chenc <chenguoqi@loongson.cn>
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qiulaidongfeng [Wed, 13 Aug 2025 14:33:14 +0000 (22:33 +0800)]
cmd/fix: remove all functionality except for buildtag
For #73605
Change-Id: I4b46b5eb72471c215f2cc208c1b0cdd1fbdbf81a
Reviewed-on: https://go-review.googlesource.com/c/go/+/695855 Reviewed-by: Michael Matloob <matloob@golang.org> Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Alan Donovan <adonovan@google.com>
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Auto-Submit: Alan Donovan <adonovan@google.com>
runtime: simplify openbsd check in usesLibcall and mStackIsSystemAllocated
The openbsd/mips64 runtime code was removed in CL 649659.
For #61546
Change-Id: I03f16c3396baddb0ee9aa751dd6f699a835e7586
Reviewed-on: https://go-review.googlesource.com/c/go/+/700976
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com> Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Joel Sing <joel@sing.id.au> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@golang.org>
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Change-Id: I488b55a21eaaf74373c2789a34bf9b3945ced072
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Nicholas S. Husin [Wed, 3 Sep 2025 18:25:59 +0000 (14:25 -0400)]
net/http: fix cookie value of "" being interpreted as empty string.
In issue #46443, we have established that double-quotes in cookie values
should be kept as part of the value, rather than being discarded.
However, we have missed the edge case of "" until now. This CL fixes
said edge case.
Fixes #75244
Change-Id: I627ad2376931514aa5dcc8961ad804e42b7d9434
Reviewed-on: https://go-review.googlesource.com/c/go/+/700755 Reviewed-by: Nicholas Husin <husin@google.com>
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Michael Anthony Knyszek [Thu, 7 Aug 2025 18:53:00 +0000 (18:53 +0000)]
cmd/trace: don't filter events for profile by whether they have stack
Right now the profile-from-trace code blindly discards events that don't
have a stack, but this means it can discard 'end' events for goroutine
time ranges that don't have stacks, like when a goroutine exits a
syscall. This means we drop stack samples we *do* have, because we
correctly already only use the stack trace of the corresponding 'start'
event for a time-range-of-interest anyway.
This change means that some events will be tracked that have no stack in
their start event, but that's fine. It won't end up in the profile
anyway because the stack is empty! And the rest of the code appears to
be robust to an empty stack already.
Thank you to Rhys Hiltner for reporting this issue and for the
reproducer, which I have worked into a test for this change.
Fixes #74850.
Change-Id: I943b97ecf6b82803e4a778a0f83a14473d32254e
Reviewed-on: https://go-review.googlesource.com/c/go/+/694156 Reviewed-by: Rhys Hiltner <rhys.hiltner@gmail.com> Reviewed-by: Michael Pratt <mpratt@google.com>
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crypto/x509: don't force system roots load in SetFallbackRoots
This change removes the need from SetFallbackRoots to force loading
of all system CAs, it postpones that to initSystemRoots.
This change also introduces few tests for SetFallbackRoots (linux only),
with the use of user and mount namespaces, such that we can control
the system CAs in the test.
Updates #73691
Change-Id: Ic37270f7825b96d5c3ed8358bbf1895a760a1312
Reviewed-on: https://go-review.googlesource.com/c/go/+/677496 Reviewed-by: Michael Pratt <mpratt@google.com>
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Xiaolin Zhao [Fri, 29 Aug 2025 08:20:16 +0000 (16:20 +0800)]
cmd/internal/obj/loong64: fix the usage of offset in the instructions [X]VLDREPL.{B/H/W/D}
The previously defined usage of offset was ambiguous and not easy to understand.
For example, to fetch 4 bytes of data from the address base+8 and
broadcast it to each word element of vector register V5, the assembly
implementation is as follows:
previous: VMOVQ 2(base), V5.W4
current: VMOVQ 8(base), V5.W4
Change-Id: I8bc84e35033ab63bd10f4c61618789f94314f78c
Reviewed-on: https://go-review.googlesource.com/c/go/+/699875 Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: abner chenc <chenguoqi@loongson.cn>
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Julien Cretel [Sun, 31 Aug 2025 19:34:07 +0000 (19:34 +0000)]
path{,/filepath}: speed up Match
This change adds benchmarks for Match and speeds it up by simplifying
scanChunk (to the point of making it inlineable) and eliminating some
branches in matchChunk.
Here are some benchmark results (no change to allocations):
The osArchInit function was introduced as a workaround for a Linux kernel bug
that corrupted vector registers on x86 CPUs during signal delivery.
The bug was introduced in Linux 5.2 and fixed in 5.3.15, 5.4.2, and all 5.5 and later kernels.
The fix was also back-ported by major distros.
Change-Id: I59990a7df104843955301c5cb8a547614eba145b
GitHub-Last-Rev: 8425af458bfaad0d64d21ff3f3e0049d186f44ed
GitHub-Pull-Request: golang/go#75246
Reviewed-on: https://go-review.googlesource.com/c/go/+/700555 Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Michael Pratt <mpratt@google.com>
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cmd/compile/internal/ssa: load constant values from abi.PtrType.Elem
This CL makes the generated code for reflect.TypeFor as simple as an
intrinsic function.
Fixes #75203
Change-Id: I7bb48787101f07e77ab5c583292e834c28a028d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/700336
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Alessandro Arzilli [Mon, 18 Aug 2025 13:49:50 +0000 (15:49 +0200)]
cmd/compile: export to DWARF types only referenced through interfaces
Delve and viewcore use DWARF type DIEs to display and explore the
runtime value of interface variables.
This has always been slightly problematic since the runtime type of an
interface variable might only be reachable through interfaces and thus
be missing from debug_info (see issue #46670).
Prior to commit f4de2ecf this was not a severe problem since a struct
literal caused the allocation of a struct into an autotemp variable,
which was then used by dwarfgen to make sure that the DIE for that type
would be generated.
After f4de2ecf such autotemps are no longer being generated and
go1.25.0 ends up having many more instances of interfaces with
unreadable runtime type (https://github.com/go-delve/delve/issues/4080).
This commit fixes this problem by scanning the relocation of the
function symbol and adding to the function's DIE symbol references to
all types used by the function to create interfaces.
Fixes go-delve/delve#4080
Updates #46670
Change-Id: I3e9db1c0d1662905373239816a72604ac533b09e
Reviewed-on: https://go-review.googlesource.com/c/go/+/696955 Reviewed-by: Michael Pratt <mpratt@google.com>
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Auto-Submit: Michael Pratt <mpratt@google.com> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Than McIntosh <thanm@golang.org> Reviewed-by: Florian Lehner <lehner.florian86@gmail.com>
Co-authored-by: David Anderson <dave@natulte.net>
Change-Id: I54795763bdc5f62da469c2ae20618c36b64396f3
Reviewed-on: https://go-review.googlesource.com/c/go/+/700355
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