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Commit Graph

48338 Commits

Author SHA1 Message Date
tkawakita
3463852b76 math/big: fix typo of comment (BytesScanner to ByteScanner)
Change-Id: I0c2d26d6ede1452008992efbea7392162da65014
Reviewed-on: https://go-review.googlesource.com/c/go/+/331651
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2021-06-29 16:57:13 +00:00
Cuong Manh Le
fd4b587da3 cmd/compile: suppress details error for invalid variadic argument type
CL 255241 made error message involving variadic calls clearer. To do it,
we added a check that the type of variadic argument must be a slice.
That's why the compiler crashes for invalid variadic argument type.

Instead, we can just omit the details error message, and report not
enough arguments error, which matches the behavior of go/types and types2.

Fixes #46957

Change-Id: I638d7e8f031f0ee344d5d802104fd93a60aae00a
Reviewed-on: https://go-review.googlesource.com/c/go/+/331569
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2021-06-29 04:38:12 +00:00
eric fang
e2e05af6e1 cmd/internal/obj/arm64: fix an encoding error of CMPW instruction
For arm64 CMP, ADD and other similar extended register instructions,
if there is no extension, the default extion is LSL<<0, but the default
encoding value (the value of 'option' field) of 32-bit instruction and
64-bit instruction is different, 32-bit is 2 and 64-bit is 3. But the
current assembler incorrectly encodes the value of 32-bit instruction
to 3. This CL fixes this error.

Change-Id: I0e09af2c9c5047a4ed2db7d1183290283db9c31c
Reviewed-on: https://go-review.googlesource.com/c/go/+/329749
Reviewed-by: eric fang <eric.fang@arm.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: eric fang <eric.fang@arm.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
2021-06-29 02:34:20 +00:00
Matthew Dempsky
4bb0847b08 cmd/compile,runtime: change unsafe.Slice((*T)(nil), 0) to return []T(nil)
This CL removes the unconditional OCHECKNIL check added in
walkUnsafeSlice by instead passing it as a pointer to
runtime.unsafeslice, and hiding the check behind a `len == 0` check.

While here, this CL also implements checkptr functionality for
unsafe.Slice and disallows use of unsafe.Slice with //go:notinheap
types.

Updates #46742.

Change-Id: I743a445ac124304a4d7322a7fe089c4a21b9a655
Reviewed-on: https://go-review.googlesource.com/c/go/+/331070
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
2021-06-28 23:31:13 +00:00
Matthew Dempsky
1519271a93 spec: change unsafe.Slice((*T)(nil), 0) to return []T(nil)
Updates #46742.

Change-Id: I044933a657cd1a5cdb29863e49751df5fe9c258a
Reviewed-on: https://go-review.googlesource.com/c/go/+/331069
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Trust: Matthew Dempsky <mdempsky@google.com>
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-06-28 23:31:05 +00:00
Mia Zhu
5385e2386b runtime/internal/atomic: drop Cas64 pointer indirection in comments
Change-Id: Ieff0065cbd81e045594ce12e10338b0666816d70
GitHub-Last-Rev: d842f5cb3e
GitHub-Pull-Request: golang/go#46949
Reviewed-on: https://go-review.googlesource.com/c/go/+/331309
Trust: Keith Randall <khr@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2021-06-28 21:17:28 +00:00
Matthew Dempsky
956c81bfe6 cmd/go: add GOEXPERIMENT to go env output
This CL adds GOEXPERIMENT to `go env` output, and also makes it
configurable via `GOENV`. Thanks to Baokun Lee's CL 304350 for the
test and initial work on this.

Fixes #45226.

Change-Id: Ie7f92a8a503b6a2a4df3f6598f0b2bf2915e2e7d
Reviewed-on: https://go-review.googlesource.com/c/go/+/328751
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Trust: Bryan C. Mills <bcmills@google.com>
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2021-06-28 20:51:30 +00:00
Matthew Dempsky
a1d27269d6 cmd/go: prep for 'go env' refactoring
This CL refactors code a little to make it easier to add GOEXPERIMENT
support in the future.

Change-Id: I87903056f7863049e58be72047b2b8a60a213baf
Reviewed-on: https://go-review.googlesource.com/c/go/+/329654
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-06-28 20:51:04 +00:00
hao
901510ed4e cmd/link/internal/ld: skip the windows ASLR test when CGO_ENABLED=0
the test case is still using gcc when CGO is disabled.

Change-Id: I2d255bfaeb92816c8343ab72fd7984b6632d421d
GitHub-Last-Rev: de14748bd5
GitHub-Pull-Request: golang/go#46120
Reviewed-on: https://go-review.googlesource.com/c/go/+/319169
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
2021-06-28 16:42:42 +00:00
Koichi Shiraishi
361159c055 cmd/cgo: fix 'see gmp.go' to 'see doc.go'
Change-Id: I303edc9dfbf4185b5b461b121ab504f6ed9f8630
Reviewed-on: https://go-review.googlesource.com/c/go/+/330839
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
2021-06-28 16:41:43 +00:00
Matthew Dempsky
c95464f0ea internal/buildcfg: refactor GOEXPERIMENT parsing code somewhat
This CL extracts out a ParseGOEXPERIMENT helper function that parses
GOOS/GOARCH/GOEXPERIMENT values and returns active and baseline
experiment flag sets and an error value, without affecting any global
state. This will be used in the subsequent CL for 'go env' support for
GOEXPERIMENT to validate configuration changes.

The existing package initialization for Experiment and
experimentBaseline and also UpdateExperiments are updated to use it as
well.

Change-Id: Ic2ed3fd36d2a6f7f3d8172fccb865e02505c0052
Reviewed-on: https://go-review.googlesource.com/c/go/+/331109
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
2021-06-27 05:06:30 +00:00
Cherry Mui
ed01ceaf48 runtime/race: use race build tag on syso_test.go
All other test files in the runtime/race package have race build
tag, except syso_test.go. The test is only relevant if the race
detector is supported. So apply the build tag.

Fixes #46931.

Change-Id: Icdb94214d3821b4ccf61133412ef39b4d7cc7691
Reviewed-on: https://go-review.googlesource.com/c/go/+/331050
Trust: Cherry Mui <cherryyz@google.com>
Reviewed-by: Elias Naur <mail@eliasnaur.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
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2021-06-25 21:07:44 +00:00
Bryan C. Mills
d1916e5e84 go/types: in TestCheck/issues.src, import regexp/syntax instead of cmd/compile/internal/syntax
TestCheck/issues.src was failing after running
	rm -r $(go env GOROOT)/pkg/*/cmd
as the builders do when building binary releases.

For users who write programs that depend on go/types, it should be
reasonable for end users to run the tests for go/types as part of 'go
test all', and those tests should pass even if they installed Go from
a binary release.

The test case in issues.src was importing cmd/compile/internal/syntax
in order to check the reported package name.

I tried to fix the problem by having the test import from source
instead of from export data. Unfortunately, that changed the behavior
under test: the go/types.Package.Imports reports (and is documented to
report) a different set of imported packages when loading from source
as compared to when loading from export data.

For this particular test, after CL 313035 that difference resulted in
go/types treating the "syntax" name as ambiguous when importing from
source, because a transitive dependency on "regexp/syntax" is found
when loading from source but omitted when loading from export data.

The simple fix to make the package unambiguous again is to adapt the
test to import regexp/syntax directly. That not only makes the package
unambiguous with all importers, but also avoids depending on a
cmd-internal package that cannot be loaded from export data in binary
distributions of the Go toolchain.

For #43232

Change-Id: Iba45a680ea20d26daa86ac538fd8f1938e8b73ab
Reviewed-on: https://go-review.googlesource.com/c/go/+/330431
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
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Reviewed-by: Robert Findley <rfindley@google.com>
2021-06-25 21:05:10 +00:00
Bryan C. Mills
5160896c69 go/types: in TestStdlib, import from source instead of export data
TestStdlib was failing after running
	rm -r $(go env GOROOT)/pkg/*/cmd
as the builders do when building binary releases.¹

For users who write programs that depend on go/types, it should be
reasonable to run the tests for go/types as part of 'go test all', and
those tests should pass even if they installed Go from a binary
release.

I had originally drafted this as a fallback to import from source only
if the affected packages can't be imported by the default export-data
importer. Unfortunately, I realized that we don't currently have a
builder that tests the actual release (#46900), so it is quite likely
that the fallback path would bit-rot and produce unexpected test
regressions.

So instead, we now unconditionally import from source in TestStdlib.
That makes the test substantially slower (~15s instead of ~5s on my
workstation), but with less risk of regression, and TestStdlib is
skipped in short mode already so short-mode test time is unaffected.

If we change the builders to test the actual release configuration, we
can consider restoring the faster path when export data is available.

¹df58bbac08/cmd/release/release.go (L533-L545)

For #43232

Change-Id: I764ec56926c104053bb2ef23cf258c8f0f773290
Reviewed-on: https://go-review.googlesource.com/c/go/+/330252
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
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Reviewed-by: Robert Griesemer <gri@golang.org>
2021-06-25 21:04:07 +00:00
Tao Qingyun
d01bc571f7 runtime: make ncgocall a global counter
ncgocall was stored per M, runtime.NumCgoCall lost the counter when a M die.

Fixes #46789

Change-Id: I85831fbb2713f4c30d1800d07e1f47aa0031970e
GitHub-Last-Rev: cbc15fa870
GitHub-Pull-Request: golang/go#46842
Reviewed-on: https://go-review.googlesource.com/c/go/+/329729
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Alexander Rakoczy <alex@golang.org>
2021-06-25 17:31:39 +00:00
Rob Findley
37f9a8f69d go/types: fix a bug in package qualification logic
CL 313035 had a bug, initializing pkgPathMap by walking the imported
package being considered rather than check.pkg.

Fix this, and enhance our tests to exercise this bug as well as other
edge cases.

Also fix error assertions in issues.src to not use quotation marks
inside the error regexp. The check tests only matched the error regexp
up to the first quotation mark.

Fixes #46905

Change-Id: I6aa8eae4bec6495006a5c03fc063db0d66b44cd6
Reviewed-on: https://go-review.googlesource.com/c/go/+/330629
Trust: Robert Findley <rfindley@google.com>
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2021-06-25 01:08:06 +00:00
Matthew Dempsky
c309c89db5 reflect: document that InterfaceData is a low-entropy RNG
Change-Id: Ie26b9060630e2e774ac23d8492eaaf785bfca6b7
Reviewed-on: https://go-review.googlesource.com/c/go/+/330709
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
2021-06-24 20:04:22 +00:00
Cuong Manh Le
cce621431a cmd/compile: fix wrong type in SSA generation for OSLICE2ARRPTR
Fixes #46907

Change-Id: I6a2728d2f2159df583b32f40f6100d3e90c34dd7
Reviewed-on: https://go-review.googlesource.com/c/go/+/330672
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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2021-06-24 18:58:27 +00:00
Bryan C. Mills
600a2a4ffb cmd/go: don't try to add replaced versions that won't be selected
In Go 1.12, we added a heuristic to 'go mod tidy' to resolve packages
by adding replaced-but-not-required modules before falling back to
searching for modules from the network. Unfortunately, that heuristic
fails when the replaced version is already lower than the selected
version: adding such a module to the build list doesn't change the
selected version of that module, and so it doesn't make progress
toward resolving the missing package.

Fixes #46659

Change-Id: I75e2387d5290e769f6b0fa1231dcc4605db68597
Reviewed-on: https://go-review.googlesource.com/c/go/+/330432
Trust: Bryan C. Mills <bcmills@google.com>
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Reviewed-by: Jay Conrod <jayconrod@google.com>
2021-06-24 18:12:53 +00:00
Bryan C. Mills
a9bb38222a net: remove hard-coded timeout in dialClosedPort test helper
The helper function claims that dialing a closed port should be
"nearly instantaneous", but that is empirically not the case on
OpenBSD or Windows. The tests do not appear to be particularly
sensitive to the exact upper bound otherwise, so let's just
remove the arbitrary latency assumption.

Fixes #46884

Change-Id: If00c9fdc3063da6aaf60d365d4a2ee2c94dc6df1
Reviewed-on: https://go-review.googlesource.com/c/go/+/330250
Trust: Bryan C. Mills <bcmills@google.com>
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2021-06-24 03:45:33 +00:00
Andy Pan
86d72fa2cb time: handle invalid UTF-8 byte sequences in quote to prevent panic
Fixes #46883
Updates CL 267017

Change-Id: I15c307bfb0aaa2877a148d32527681f79df1a650
Reviewed-on: https://go-review.googlesource.com/c/go/+/330289
Reviewed-by: Kevin Burke <kev@inburke.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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2021-06-24 03:20:33 +00:00
Bryan C. Mills
44a12e5f33 cmd/go: search breadth-first instead of depth-first for test dependency cycles
When we are looking for a dependency cycle involving a specific
package, we need to keep track of visited packages in order to avoid
repeatedly traversing a cycle that does not involve that package.

If we're keeping track of all visited packages anyway, we're already
spending O(N) memory on the traversal, so we may as well use
breadth-first search. That not only keeps the bookkeeping simple, but
also guarantees that we will find a shortest path (rather than a
completely arbitrary one).

Fixes #45863

Change-Id: I810c7337857e42dcb83630abbdea75021554be45
Reviewed-on: https://go-review.googlesource.com/c/go/+/330430
Trust: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
2021-06-24 02:25:23 +00:00
Bryan C. Mills
73496e0df0 net: use absDomainName in the Windows lookupPTR test helper
The real net code uses subtle heuristics to transform a domain name
to its absolute form. Since lookupPTR isn't checking that
transformation specifically, it should use the real code instead of
using a different heuristic.

Fixes #46882

Change-Id: I503357e0f62059c37c359cd54b44d343c7d5ab2a
Reviewed-on: https://go-review.googlesource.com/c/go/+/330249
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
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2021-06-24 00:39:41 +00:00
siddharth
222ed1b38a os: enable TestFifoEOF on openbsd
The test successfully runs on currently supported versions (6.8 and
6.9) of openbsd.

Fixes #25877

Change-Id: I2694f08c5596b486453c2ac829f17b8bc455f828
Reviewed-on: https://go-review.googlesource.com/c/go/+/329732
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2021-06-24 00:14:41 +00:00
Ian Lance Taylor
0ebd5a8de0 cmd/go: update ToolTags based on GOARCH value
The build.Context ToolTags value is set based on the set of enabled
experiments, which in turn depends on GOARCH. Before this CL the set
of experiments was being set based on GOARCH in the environment.
That is normally fine, but fails with cmd/go when somebody has run
"go env -w GOARCH=val"; in that case cmd/go changes its GOARCH value
after initialization. The new GOARCH value was affect the set of
enabled experiments, which can affect the ToolTags value. With this
CL, we update ToolTags in cmd/go based on the GOARCH value it is using.

This is a pretty ugly fix. We should do something cleaner for 1.18.

Fixes #46815

Change-Id: Ie9416781a168248813c3da8afdc257acdd3fef7e
Reviewed-on: https://go-review.googlesource.com/c/go/+/329930
Trust: Ian Lance Taylor <iant@golang.org>
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2021-06-22 16:59:10 +00:00
Robert Griesemer
5bd09e5efc spec: unsafe.Add/Slice are not permitted in statement context
Add unsafe.Add and unsafe.Slice to the list of built-in functions
which are not permitted in statement context. The compiler and
type checker already enforce this restriction, this just fixes
a documentation oversight.

For #19367.
For #40481.

Change-Id: Iabc63a8db048eaf40a5f5b5573fdf00b79d54119
Reviewed-on: https://go-review.googlesource.com/c/go/+/329925
Trust: Robert Griesemer <gri@golang.org>
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2021-06-22 16:01:58 +00:00
Xing Gao
666315b4d3 runtime/internal/atomic: remove incorrect pointer indirection in comment
Change-Id: I9d743b7f6b001158299bea4af4aede678654bc8e
GitHub-Last-Rev: 7e07834abc
GitHub-Pull-Request: golang/go#46851
Reviewed-on: https://go-review.googlesource.com/c/go/+/329730
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ben Shi <powerman1st@163.com>
2021-06-22 14:07:22 +00:00
Rob Findley
63daa774b5 go/types: guard against checking instantiation when generics is disabled
When type checking t[_], where t is a type name, it was possible to leak
an error message related to generics. Fix this by guarding on
typeparams.Enabled.

In order to test this fix, we need to be able to run the new go/types
test only if type parameters are disabled. Introduce the .go1 test data
suffix (similar to .go2) to control this behavior.

Originally found via fuzzing, though the test case was manually
simplified.

Updates #46404

Change-Id: Ib1e2c27cf974c2a5ca5b9d6d01b84a30ba4d583b
Reviewed-on: https://go-review.googlesource.com/c/go/+/329793
Trust: Robert Findley <rfindley@google.com>
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2021-06-22 11:31:57 +00:00
Rob Findley
197a5ee2ab cmd/gofmt: remove stale documentation for the -G flag
This documentation remained from the original dev.typeparams merge. This
flag no longer exists.

Change-Id: Ic9a82071c512614dc1382780d69ef13253fca21d
Reviewed-on: https://go-review.googlesource.com/c/go/+/329792
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2021-06-22 02:44:43 +00:00
Rob Findley
9afd158eb2 go/parser: parse an ast.IndexExpr for a[]
To be consistent with Go 1.16, and to preserve as much information in
the AST as possible, parse an ast.IndexExpr with BadExpr Index for the
invalid expression a[].

A go/types test had to be adjusted to account for an additional error
resulting from this change.

We don't have a lot of test coverage for parser error recovery, so
rather than write an ad-hoc test for this issue, add a new go/types test
that checks that the indexed operand is used.

Updates #46403

Change-Id: I21e6ff4179746aaa50e530d4091fded450e69824
Reviewed-on: https://go-review.googlesource.com/c/go/+/329791
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2021-06-22 02:37:43 +00:00
Bryan C. Mills
1bd5a20e3c cmd/go: add a -go flag to 'go mod graph'
For #46366

Change-Id: I8417e6e4dbb8cb56ff7afc16893a01b7bb938217
Reviewed-on: https://go-review.googlesource.com/c/go/+/329529
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2021-06-21 21:21:09 +00:00
Bryan C. Mills
761edf71f6 cmd/internal/moddeps: use a temporary directory for GOMODCACHE if needed
CL 328770 should be sufficient to fix the specific failure in the
report, but when attempting to reproduce it I noticed a related
failure mode, triggered by the environment variables set in
src/run.bash.

The failure mode is currently masked on the Go project builders due to
the lack of any 'longtest' builder running as a non-root user
(#10719).

It is also masked from Go contributors running 'run.bash' locally
because 'run.bash' does not actually run all of the tests unless
GO_TEST_SHORT=0 is set in the environment (#29266, #46054).

Fixes #46695

Change-Id: I272c09dae462734590dce59b3d3c5b6d3f733c92
Reviewed-on: https://go-review.googlesource.com/c/go/+/328771
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
2021-06-21 20:53:11 +00:00
Bryan C. Mills
a0400420ad cmd/internal/moddeps: use -mod=readonly instead of -mod=mod
TestAllDependencies is attempting to check that the modules in GOROOT
satisfy certain properties; it should not modify those modules itself.

The “quick” part of the test checks that vendored packages are present
and complete, without constructing a parallel GOROOT. It shouldn't
resolve new dependencies or change formatting in any way.

The longer version of the test already constructs a parallel GOROOT
and tidies the modules within it. That part of the test will flag any
modifications needed to the go.mod and go.sum files, without modifying
the original GOROOT.

From what I can tell, the failure mode in #46695 is caused by running
the test on a module rooted in $GOROOT proper. There is no such module
in the mainline Go repo, but it may have been introduced in the fork
and could also be introduced by stray edits in contributor CLs. It
should be diagnosed clearly.

For #46695

Change-Id: I62b90ccbd54cb3e3b413017021c952a7b1d455e7
Reviewed-on: https://go-review.googlesource.com/c/go/+/328770
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
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Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
2021-06-21 20:51:39 +00:00
Ian Lance Taylor
3f9ec83b10 cmd/go: document GOPPC64 environment variable
Change-Id: I2d2c02eec4ac6eca218fa5334d32650c1620692c
Reviewed-on: https://go-review.googlesource.com/c/go/+/329689
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Carlos Eduardo Seo <carlos.seo@linaro.org>
2021-06-21 18:59:43 +00:00
Rob Findley
20bdfba325 go/scanner: fall back to next() when encountering 0 bytes in parseIdentifier
CL 308611 optimized parseIdentifier for ASCII, but inadvertently skipped
error handling for 0 bytes. Don't take the optimized path when
encountering 0.

Fixes #46855

Change-Id: Ic584e077eb74c012611fefa20eb71ca09c81b3c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/329790
Trust: Robert Findley <rfindley@google.com>
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Reviewed-by: Robert Griesemer <gri@golang.org>
2021-06-21 17:37:39 +00:00
Daniel Theophanes
44f9a3566c database/sql: fix deadlock test in prepare statement
The issue go#46783 correctly diagnosed the context timeout
caused an intermittent failure when the context was canceled
prior to the BeginTx call. However due to the asynchronous nature
of canceling a Tx through a context on fast systems, the tx.Prepare
also succeeded. On slower systems or if a time.Sleep was inserted
between the BeginTx and Prepare, the Prepare would fail.

Resolve this by moving the context cancel after the Prepare.
This will still trigger the deadlock which I tested locally.
In addition, I interspersed multiple time.Sleep calls and the
test still functioned.

Fixes #46852

Change-Id: I9cbf90d3c12b2555493a37799738772b615ae39d
Reviewed-on: https://go-review.googlesource.com/c/go/+/329830
Run-TryBot: Daniel Theophanes <kardianos@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Bryan C. Mills <bcmills@google.com>
2021-06-21 17:37:23 +00:00
Derek Parker
16e82be454 runtime: fix crash during VDSO calls on PowerPC
This patch reinstates a fix for PowerPC with regard to making VDSO calls
while receiving a signal, and subsequently crashing. The crash happens
because certain VDSO calls can modify the r30 register, which is where g
is stored. This change was reverted for PowerPC because r30 is supposed
to be a non-volatile register. This is true, but that only makes a
guarantee across function calls, but not "within" a function call. This
patch was seemingly fine before because the Linux kernel still had hand
rolled assembly VDSO function calls, however with a recent change to C
function calls it seems the compiler used can generate instructions
which temporarily clobber r30. This means that when we receive a signal
during one of these calls the value of r30 will not be the g as the
runtime expects, causing a segfault.

You can see from this assembly dump how the register is clobbered during
the call:

(the following is from a 5.13rc2 kernel)

```
Dump of assembler code for function __cvdso_clock_gettime_data:
   0x00007ffff7ff0700 <+0>:     cmplwi  r4,15
   0x00007ffff7ff0704 <+4>:     bgt     0x7ffff7ff07f0 <__cvdso_clock_gettime_data+240>
   0x00007ffff7ff0708 <+8>:     li      r9,1
   0x00007ffff7ff070c <+12>:    slw     r9,r9,r4
   0x00007ffff7ff0710 <+16>:    andi.   r10,r9,2179
   0x00007ffff7ff0714 <+20>:    beq     0x7ffff7ff0810 <__cvdso_clock_gettime_data+272>
   0x00007ffff7ff0718 <+24>:    rldicr  r10,r4,4,59
   0x00007ffff7ff071c <+28>:    lis     r9,32767
   0x00007ffff7ff0720 <+32>:    std     r30,-16(r1)
   0x00007ffff7ff0724 <+36>:    std     r31,-8(r1)
   0x00007ffff7ff0728 <+40>:    add     r6,r3,r10
   0x00007ffff7ff072c <+44>:    ori     r4,r9,65535
   0x00007ffff7ff0730 <+48>:    lwz     r8,0(r3)
   0x00007ffff7ff0734 <+52>:    andi.   r9,r8,1
   0x00007ffff7ff0738 <+56>:    bne     0x7ffff7ff07d0 <__cvdso_clock_gettime_data+208>
   0x00007ffff7ff073c <+60>:    lwsync
   0x00007ffff7ff0740 <+64>:    mftb    r30      <---- RIGHT HERE
=> 0x00007ffff7ff0744 <+68>:    ld      r12,40(r6)
```

What I believe is happening is that the kernel changed the PowerPC VDSO
calls to use standard C calls instead of using hand rolled assembly. The
hand rolled assembly calls never touched r30, so this change was safe to
roll back. That does not seem to be the case anymore as on the 5.13rc2
kernel the compiler *is* generating assembly which modifies r30, making
this change again unsafe and causing a crash when the program receives a
signal during these calls (which will happen often due to async
preempt). This change happened here:
https://lwn.net/ml/linux-kernel/235e5571959cfa89ced081d7e838ed5ff38447d2.1601365870.git.christophe.leroy@csgroup.eu/.

I realize this was reverted due to unexplained hangs in PowerPC
builders, but I think we should reinstate this change and investigate
those issues separately:
f4ca3c1e0a

Fixes #46803

Change-Id: Ib18d7bbfc80a1a9cb558f0098878d41081324b52
GitHub-Last-Rev: c3002bcfca
GitHub-Pull-Request: golang/go#46767
Reviewed-on: https://go-review.googlesource.com/c/go/+/328110
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
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Reviewed-by: Cherry Mui <cherryyz@google.com>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
2021-06-21 16:58:36 +00:00
Cherry Mui
2e542c3c06 runtime/pprof: deflake TestMorestack more
Apparently, TestMorestack is still flaky on darwin/arm64 builder
after CL 307730. Let it spend more time in copying the stack.
With this CL, on my Apple M1 machine it passes reliably in short
mode for 1000 runs, and reliably gets 250+ samples in the 5-second
interval in long mode.

May fix #46755.

Change-Id: I07b36c1cf63ad35f7820e1f8e837e29376a37b2a
Reviewed-on: https://go-review.googlesource.com/c/go/+/329869
Trust: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Michael Pratt <mpratt@google.com>
2021-06-21 16:48:36 +00:00
Jay Conrod
ced0fdbad0 doc/go1.17: note deprecation of 'go get' for installing commands
Fixes #43684

Change-Id: I8982f6816c002c71e62f37a926c8543e34b8b785
Reviewed-on: https://go-review.googlesource.com/c/go/+/329549
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-06-21 15:39:45 +00:00
Filippo Valsorda
7a5e7047a4 doc/go1.17: add Go 1.18 pre-announcements
Updates #41682
Updates #45428

Change-Id: Ia31d454284f0e114bd29ba398a2858fc90454032
Reviewed-on: https://go-review.googlesource.com/c/go/+/327811
Trust: Filippo Valsorda <filippo@golang.org>
Trust: Katie Hockman <katie@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
2021-06-21 14:58:02 +00:00
Filippo Valsorda
85a2e24afd doc/go1.17: add security-related release notes
Change-Id: I573def0f48fe66a1bc60fff321ab007c76b47ef0
Reviewed-on: https://go-review.googlesource.com/c/go/+/327810
Reviewed-by: Katie Hockman <katie@golang.org>
Trust: Katie Hockman <katie@golang.org>
Trust: Filippo Valsorda <filippo@golang.org>
2021-06-21 14:57:47 +00:00
Rob Findley
1de332996c doc/go1.17: document go/parser.SkipObjectResolution
Documents the mode added in CL 306149 to skip object resolution.

Fixes #46298

Change-Id: I6a14aaa00790f9f7e4e4ba17033355f5e878d74b
Reviewed-on: https://go-review.googlesource.com/c/go/+/329009
Trust: Robert Findley <rfindley@google.com>
Trust: Robert Griesemer <gri@golang.org>
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2021-06-21 14:12:09 +00:00
Bryan C. Mills
117ebe0f52 cmd/go: do not require the module cache to exist for 'go mod edit'
Updates #46695

Change-Id: I4afbc1401ef4183d94c1ac6271394fac1fff95ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/328769
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
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Reviewed-by: Jay Conrod <jayconrod@google.com>
2021-06-21 14:10:22 +00:00
Andrew G. Morgan
460900a7b5 os/signal: test with a significantly longer fatal timeout
We've observed some occasional os-arch specific timeouts
in signal.TestSignalTrace(). While the main purpose of a
short timeout is to ensure the passing tests complete
quickly, the unexpected failure path can tolerate waiting
longer (the test is not intended to test how slow or
overloaded the OS is at the time it is run).

Fixes #46736
Change-Id: Ib392fc6ce485a919612784ca88ed76c30f4898e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/329502
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
2021-06-20 11:17:27 +00:00
Daniel Theophanes
b73cc4b02b database/sql: do not rely on timeout for deadlock test
Fixes #46783

Change-Id: I8a8d1716279a041a7411c0c47a440a7997b39c80
Reviewed-on: https://go-review.googlesource.com/c/go/+/328649
Run-TryBot: Daniel Theophanes <kardianos@gmail.com>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Carlos Amedee <carlos@golang.org>
2021-06-19 00:46:21 +00:00
Nigel Tao
86743e7d86 image: add RGBA64Image interface
The new RGBA64At method is equivalent to the existing At method (and the
new SetRGBA64 method is equivalent to the existing Set method in the
image/draw package), but they can avoid allocations from converting
concrete color types to the color.Color interface type.

Also update api/go1.17.txt and doc/go1.17.html

Fixes #44808

Change-Id: I8671f3144512b1200fa373840ed6729a5d61bc35
Reviewed-on: https://go-review.googlesource.com/c/go/+/311129
Trust: Nigel Tao <nigeltao@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
2021-06-18 23:57:09 +00:00
Matthew Dempsky
9401172166 runtime: clarify Frames.Next documentation
I wrote code that relied on this API, but I misunderstood the original
description of the "more" result. As a consequence, my code always
stopped one frame early.

This CL expands the documentation to be more explicit and specifically
call out my confusion (i.e., that the "more" result indicates whether
the *next* Next call will return a valid Frame, and not whether this
call did).

Change-Id: If135f8f8c05425073d45377c4179e4f79e6bd6ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/329389
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2021-06-18 22:05:09 +00:00
Ian Lance Taylor
57aaa19aae runtime: disable CPU profiling before removing the SIGPROF handler
Otherwise, in c-archive or c-shared mode, there is the chance of
getting a SIGPROF just after the signal handler is removed but before
profiling is disabled, in which case the program will die.

Fixes #46498

Change-Id: I5492beef45fec9fb9a7f58724356d6aedaf799ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/329290
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-06-18 16:56:48 +00:00
Nick Miyake
6f22d2c682 doc/go1.17: fix typo
Change-Id: Ie8629e0f710d3eb95b4bbcc9c680ffc5004c2f15
GitHub-Last-Rev: 52f48f429c
GitHub-Pull-Request: golang/go#46812
Reviewed-on: https://go-review.googlesource.com/c/go/+/329289
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Tobias Klauser <tobias.klauser@gmail.com>
2021-06-18 11:01:12 +00:00
Michael Pratt
45f251ad6c cmd/pprof,runtime/pprof: disable test on more broken platforms
runtime/pprof has a more complete list of platforms with broken
profiling than I used in cmd/pprof in https://golang.org/cl/325809.
Duplicate that list in cmd/pprof and clean it up a bit in runtime/pprof
for easier reference.

Change-Id: I8f2580aac223de9b73cfff4355f49916f7b76493
Reviewed-on: https://go-review.googlesource.com/c/go/+/329149
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2021-06-17 21:58:54 +00:00