runtime: don't re-initialize itab while looking for missing function

The itab we're initializing again, just to figure out which method
is missing, might be stored in read-only memory.
This can only happen in certain weird generics situations, so it is
pretty rare, but it causes a runtime crash when it does happen.

Fixes #65962

Change-Id: Ia86e216fe33950a794ad8e475e76317f799e9136
Reviewed-on: https://go-review.googlesource.com/c/go/+/567615
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>

go/types, types2: add tracing to Checker.validType

Debugging support.

For #65711.

Change-Id: I2b8b03d2c6e02d32a4f9272313e852f17da35b3e
Reviewed-on: https://go-review.googlesource.com/c/go/+/567975
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

internal/coverage/encodemeta: simplify appending zero values

Appending zero values directly.

Change-Id: Icfb6e135b6aa16662dd67bdbf64ea0f63c612b2f
GitHub-Last-Rev: 57547b94087f216e943362e507b2339dd385f568
GitHub-Pull-Request: golang/go#65291
Reviewed-on: https://go-review.googlesource.com/c/go/+/558576
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

text/tabwriter: add recovered panic message to rethrow

Without it, there is little information to debug why the original write
failed.

Change-Id: I21615ab7ca402115d02becdbd11bbacde55b98b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/567955
Auto-Submit: Nicolas Hillegeer <aktau@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>

cmd/link: add option to enable full RELRO for ELF

-bindnow linker option enables full RELRO on ELF targets.

This options defaults to false and preserves
current behavior - partial relro for buildmode=pie.

Also, the following changes were made to align
internal linker's behavior with external ELF linkers:
- GNU_RELRO segment is marked Read-only
- .dynamic is a relro section for partial and full RELRO
- .got is a relro section for partial and full RELRO
- .got.plt is a relro section for full RELRO only

Supersedes #45681 (golang.org/cl/312509)

Change-Id: I51c4ef07b14beceb7cd6fd989f323e45f89a63ca
GitHub-Last-Rev: bc6826441065395b80a2b66cde67466c4d9bce2e
GitHub-Pull-Request: golang/go#58869
Reviewed-on: https://go-review.googlesource.com/c/go/+/473495
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime/cgo: ignore unknown warning options

For #65290
Fixes #65971

Change-Id: If15853f287e06b85bb1cb038b3785516d5812f84
Reviewed-on: https://go-review.googlesource.com/c/go/+/567556
Auto-Submit: Ian Lance Taylor <iant@google.com>
Commit-Queue: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>

cmd/internal/obj/ppc64: generate smaller machine code for OR/XOR of uint32 values

These binary operations can be done in two sequential instructions instead of loading a
constant into REGTMP and doing the binary op.

Change-Id: Ie0ab863f9e81afad140b92b265bca4d3f0fe90b1
Reviewed-on: https://go-review.googlesource.com/c/go/+/565215
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Run-TryBot: Paul Murphy <murp@ibm.com>

all: run go fmt

I ran go fmt to fix format on the entire repository.

Change-Id: I2f09166b6b8ba0ffb0ba27f6500efb0ea4cf21ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/566835
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Auto-Submit: Ian Lance Taylor <iant@golang.org>

testing: fix typo in comment

Change-Id: I5aa6093b0199df1ef5b0ad0fcfa651a4b990bfd5
GitHub-Last-Rev: b053d993eb497500ee63024ef12784f63fac6c0e
GitHub-Pull-Request: golang/go#65986
Reviewed-on: https://go-review.googlesource.com/c/go/+/567655
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
Auto-Submit: Carlos Amedee <carlos@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

crypto/internal/bigmod: remove unused ctGeq

Change-Id: I6d76fe4a307be0f976ccaeeedb6f08d672ae4851
GitHub-Last-Rev: a9554cdb47489b9160d3f03efd41898b244f13d0
GitHub-Pull-Request: golang/go#65992
Reviewed-on: https://go-review.googlesource.com/c/go/+/567675
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>

os: factor out newFileStatFromWin32FileAttributeData

The stat function is quite long on Windows. Simplify it a bit by
factoring out the creation of a fileStat from a Win32FileAttributeData.

This also makes it more consistent with the creation of fileStats
from other sources, which all have their own dedicated functions.

Change-Id: I0443f96d892b70ce7f3b5e92c5049e4e4a240c6c
Reviewed-on: https://go-review.googlesource.com/c/go/+/566435
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

database/sql: add error check

Change-Id: Ib9f7a1a4bf23f76457dabf85610f4799502631dc
GitHub-Last-Rev: afbb86fde12d2eeaa8121c25787b0e9c290edbc7
GitHub-Pull-Request: golang/go#65947
Reviewed-on: https://go-review.googlesource.com/c/go/+/566857
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>

encoding/xml: display closing space in error message

Fixes #48890

Change-Id: I7644d091ad92663bda52ef4905239ec499ef9207
Reviewed-on: https://go-review.googlesource.com/c/go/+/535535
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>

runtime,runtime/pprof: avoid tiny allocations in finalizer-related tests

A few tests rely on finalizers running, but are doing tiny allocations.
These tests will break if, for example, the testing package does is own
tiny allocations before calling the test function (see CL 478955). The
tiny allocator will group these allocations together and the ones done
for the tests themselves will live longer than desired. Use types which
have/are pointers for these tests so they won't be allocated by the tiny
allocator.

While here, pick up a small refactor suggested by Michael Knyszek to use
the BlockUntilEmptyFinalizerQueue helper to wait for the finalizers to
run in TestFinalizerRegisterABI.

Change-Id: I39f477d61f81dc76c87fae215339f8a38979cf94
Reviewed-on: https://go-review.googlesource.com/c/go/+/529555
Auto-Submit: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

cmd/compile/internal/syntax: rename test file to match issue

Follow-up on CL 565518 which addressed issue #65790 but added
testdata/issue65970.go instead of testdata/issue65790.go.
Rename that file to match the issue.

For #65790.

Change-Id: I647c297286355137fa950fb6722e31ae4340393b
Reviewed-on: https://go-review.googlesource.com/c/go/+/567875
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

cmd/compile/internal/inline: refactor fixpoint algorithm

This CL refactors the interleaved fixpoint algorithm so that calls can
be inlined in any order. This has no immediate effect, but it will
allow a subsequent CL to prioritize calls by inlheur score.

Change-Id: I11a84d228e9c94732ee75f0d3c99bc90d83fea09
Reviewed-on: https://go-review.googlesource.com/c/go/+/567695
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>

internal/abi: fix typo in comment

Change-Id: I27ad7ce266edc255c93012b24b6f275dd1512dc2
GitHub-Last-Rev: d196b48875861d4dff290fbda04546f0dedf0281
GitHub-Pull-Request: golang/go#65981
Reviewed-on: https://go-review.googlesource.com/c/go/+/567538
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>

net/http: make timeout errors match context.DeadlineExceeded

When returning an error which implements net.Error and reports
itself as a timeout, also report it as matching context.DeadlineExceeded.
This matches the behavior of timeout errors in the net package
and elsewhere.

Fixes #50856

Change-Id: I2ca911e3677a699af27ba89b1200401baa8b3b1b
Reviewed-on: https://go-review.googlesource.com/c/go/+/567537
Reviewed-by: Jonathan Amsterdam <jba@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

cmd/compile: compile len(ch) as call to runtime.chanlen

An upcoming CL will give this call more to do.
For now, separate out the compiler change that
stops inlining the computation.

Change-Id: I4c5cbd84a0694b306191bff38cc6ea2d69458d7d
Reviewed-on: https://go-review.googlesource.com/c/go/+/564556
Auto-Submit: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: use methods for timer

Continuing conversion from C to Go, change timer API to use methods.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I4cb88a366993a77aa4fad739793a7db7213cc38c
Reviewed-on: https://go-review.googlesource.com/c/go/+/564131
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: change timer.status to timer.state

The status enumeration is simple enough now that we can
view it as a bit set instead. Switch to a bit set, freeing up
the remaining bits for use in followup work to allow
garbage-collecting timers.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I5f331fe3db1b5cb52f8571091f97f8ba029f3ac9
Reviewed-on: https://go-review.googlesource.com/c/go/+/564130
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

runtime: use timer.lock in moveTimers

Continue using timer.lock to simplify timer operations.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: Iaf371315308425d132217eacb20b1e120a6833c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/564127
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: use timer.lock in adjusttimers

Continue using timer.lock to simplify timer operations.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I2298cede902cbf0aea268c54d741190007a733c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/564128
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: use timer.lock in runtimer

Continue using timer.lock to simplify timer operations.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I504335a010d6eb4d7d627145b64a896582158406
Reviewed-on: https://go-review.googlesource.com/c/go/+/564129
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

runtime: use timer.lock in cleantimers

Continue using timer.lock to simplify timer operations.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: Ic12fd2630e8ac23cddd00fa7e3240a1ac19da596
Reviewed-on: https://go-review.googlesource.com/c/go/+/564126
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

runtime: use timer.lock in modtimer

Continue using timer.lock to simplify timer operations.

Note the removal of a previous potential deadlock.
(Explained at new line 325, there was a lock inversion
between individual timer locks and the 'timers' lock.)

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I8c9be00d13c6acd171a8aa2882a4fc844498f754
Reviewed-on: https://go-review.googlesource.com/c/go/+/564125
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: add timer lock to lock ranking

No deadlocks yet!

Change-Id: I87fb3742a386d682fbcc8cb98e98771b54bc3fec
Reviewed-on: https://go-review.googlesource.com/c/go/+/564133
Reviewed-by: Austin Clements <austin@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: use timer.lock in deltimer

The state set is now simplified enough that all the CAS loops
are starting to look the same: they are just spin locks.
So introduce an actual timer.lock method and use it in deltimer.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: Ifd7f20eeede5c764ef10ecba64855c29a5ddbe39
Reviewed-on: https://go-review.googlesource.com/c/go/+/564124
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: merge timerDeleted into timerModified

When we make a change to a timer, we have to note the
desired change to t.when and then wait for the timer heap
owner to apply the change. There are two possible changes:
delete or set a new t.when. Most of the code for processing
these changes is the same, so we can simplify the code by
making both have the same state: timerDeleted is now
timerModified with t.nextwhen == 0.

This is part of a larger simplification of the state set.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I1a2a12f8250bcd40f7b08b83f22c3a82b124eda6
Reviewed-on: https://go-review.googlesource.com/c/go/+/564123
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: merge timerNoStatus into timerRemoved

For historical reasons, we have to treat a zero timer as
the same as an initialized timer that was stopped (removed).
The two states are already treated mostly identically.
Merge them.

This is part of a larger simplification of the state set.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I9c3aeb8f92bafb18c47489c1ec20a7b87ac5cd9c
Reviewed-on: https://go-review.googlesource.com/c/go/+/564122
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

runtime: merge timerMoving into timerModifying

timerMoving is just a kind of "locked for modification",
so merge it into timerModifying.

This is part of a larger simplification of the state set.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I5379122f96d9921ecda7a6a37cabd6c6b4d529a4
Reviewed-on: https://go-review.googlesource.com/c/go/+/564121
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: merge timerRemoving into timerModifying

timerRemoving is just a kind of "locked for modification",
so merge it into timerModifying. This does potentially remove
a fast path from deltimer, in that deltimer of timerRemoving
is a fast-path exit while deltimer of timerModifying has to
wait for the timer to settle. Since all the timerModifying
critical paths are bounded and short, this should not matter.

This is part of a larger simplification of the state set.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I039bf6a5a041a158dc3d1af8127f28eed50fc540
Reviewed-on: https://go-review.googlesource.com/c/go/+/564120
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: merge timerModifiedEarlier and timerModifierLater

Nothing actually needs to know the difference between these
two states, so merge them.

This is part of a larger simplification of the state set.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: Ia30699ac92e66467773942e7df1fb21470a6e51a
Reviewed-on: https://go-review.googlesource.com/c/go/+/564119
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

runtime: delete addtimer

modtimer can always be used in place of addtimer.
Do that and delete addtimer, avoiding duplicated logic.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I70291796bdac3bef5e0850f039f6f4a1da4498ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/564118
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: move all timer-locking code into time.go

No code changes, only code moves here.
Move all code that locks pp.timersLock into time.go
so that it is all in one place, for easier abstraction.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I1b59af7780431ec6479440534579deb1a3d9d7a3
Reviewed-on: https://go-review.googlesource.com/c/go/+/564117
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: delete clearDeletedTimers

adjusttimers already contains the same logic. Use it instead.
This avoids having two copies of the code and is faster.

adjusttimers was formerly O(n log n) but is now O(n).
clearDeletedTimers was formerly O(n² log n) and is now gone!

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I32bf24817a589033dc304b359f8df10ea21f48fc
Reviewed-on: https://go-review.googlesource.com/c/go/+/564116
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: simplify, speed up adjusttimers

The current adjusttimers does an O(n) loop and then queues
a bunch of reinsertions, each of which is O(log n), for a worst
case of O(n log n) time plus an allocation of n elements.

Reestablishing the heap invariant from an arbitrarily ordered
slice can be done in O(n) time, so it is both simpler and faster
to avoid the allocated temporary queue and just re-init the
heap if we have damaged it. The cost of doing so is no worse
than the O(n) loop we already did.

This change also avoids holding multiple timers locked (status
set to timerMoving) at any given moment, as well as holding
individual timers locked for unbounded amounts of time,
as opposed to fixed-size critical sections.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: If966c1d1e66db797f4b19e7b1abbc06ab651764d
Reviewed-on: https://go-review.googlesource.com/c/go/+/564115
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

go/build: add check for allowed vendor packages

Add a test that checks that all vendored packages in both src/ and
src/cmd are on an allowlist.

For #65678.

Change-Id: Ie9982f8b69c9c0fc6fef41c9dadeb464ecd7781a
Reviewed-on: https://go-review.googlesource.com/c/go/+/564355
Reviewed-by: Bryan Mills <bcmills@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>

cmd/go: fix TestScript/mod_vendor_goversion for CL 567476

Change-Id: I00b9934a4942a662a2eb14941c9d07e8750aa1b5
Reviewed-on: https://go-review.googlesource.com/c/go/+/567815
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Russ Cox <rsc@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>

reflect: add Overflow methods to Type

This CL adds new methods synonymous with the method of the same name
in reflect.Value to reflect.Type: OverflowComplex, OverflowFloat, OverflowInt, OverflowUint.

Fixes #60427

Change-Id: I7a0bb35629e59a7429820f13fcd3a6f120194bc6
GitHub-Last-Rev: 26c11bcffe0f418e7d5c37e14587e738d5d939d6
GitHub-Pull-Request: golang/go#65955
Reviewed-on: https://go-review.googlesource.com/c/go/+/567296
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

cmd/dist: let the three runtime -quick tests run simultaneously

For #65164

Change-Id: Ied19cebd113ef91c34f613cafbeb92a335d6420d
GitHub-Last-Rev: 8118be6e30ffc4edcd88b8a1d5ee3105e2c760de
GitHub-Pull-Request: golang/go#65444
Reviewed-on: https://go-review.googlesource.com/c/go/+/560597
Commit-Queue: Ian Lance Taylor <iant@golang.org>
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: Than McIntosh <thanm@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>

cmd/compile: mark pointer to noalg type as noalg

When the compiler writes PtrToThis field of noalg type, it generates
its pointer type. Mark them as noalg to prevent put them in typelinks.

Fixes #65957

Change-Id: Icbc3b18bc866f9138c7648e42dd500a80326f72b
Reviewed-on: https://go-review.googlesource.com/c/go/+/567335
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Auto-Submit: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>

go/types, types2: move Checker.langCompat from version.go to expr.go (cleanup)

This makes version.go holding core version checking code only.
No functional changes.

Change-Id: Ia88a48166cad2698765697dd7a8625b56ecc2226
Reviewed-on: https://go-review.googlesource.com/c/go/+/567536
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>

go/types, types2: consistently use singular when reporting version errors

Change-Id: I39af932b789cd18dc4bfc84f9667b1c32c9825f4
Reviewed-on: https://go-review.googlesource.com/c/go/+/567476
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

go/types, types2: initial support for parameterized type aliases

Permit type parameters on type alias declarations depending on
Go language version.

Implement various version checks such that at most one version
error is reported per type alias declaration.

Add tparams field to Alias type node.

Missing:
        - instantiation of alias types
        - API additions (requires proposal)

For #46477.

Change-Id: Ica658292bd096d3bceb513027d3353501a6c58e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/566856
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

go/types, types2: separate formatting from error handling functions

This change moves formatting-specific functionality into a new file
format.go and rearranges the code in the errors.go files to be in
the same order for go/types and types2, making them more similar.

No functionality change. This is a pure code reordering.

Change-Id: Ibd818792397be146ad510a6c7308c85d3bb65956
Reviewed-on: https://go-review.googlesource.com/c/go/+/566555
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>

go/types: generate initorder.go from types2 source

This CL reduces the amount of code that needs to be maintained
manually by about 320 LOC.

Change-Id: Ib797e86dd4abd3a9fe614787103f0e5cebd5e4ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/565838
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Robert Griesemer <gri@google.com>

go/types: generate mono.go from types2 source

This CL reduces the amount of code that needs to be maintained
manually by about 340 LOC.

Change-Id: If7b96c30e5a2f1ff28ebf4ca2f3ac3f73d6a8865
Reviewed-on: https://go-review.googlesource.com/c/go/+/565839
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Robert Findley <rfindley@google.com>

go/types, types2: call error handler for each sub-error as needed

Factor out calling or typechecker error handler from error_.report.
In error_.report, decide if the typechecker error handler needs to
be called once or multiple times.

This change enables the use of sub-errors for types2 and go/types,
with the error handler taking care of deciding how many "separate"
errors are reported via the API.

Use new error reporting in go/types mono and initorder computation;
with the above adjustments, these changes should now pass gopls tests.

Also: adjust some format strings to avoid vet errors.

Change-Id: If05a7044399b4783c596c69a8158619f83c21c70
Reviewed-on: https://go-review.googlesource.com/c/go/+/566537
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>

net/http/httputil: avoid ReverseProxy data race on 1xx response and error

ReverseProxy uses a httptrace.ClientTrace.Got1xxResponse trace hook
to capture 1xx response headers for proxying. This hook can be called
asynchrnously after RoundTrip returns. (This should only happen when
RoundTrip has failed for some reason.) Add synchronization so we don't
attempt to modifying the ResponseWriter headers map from the hook
after another goroutine has begun making use of it.

Fixes #65123

Change-Id: I8b7ecb1a140f7ba7e37b9d27b8a20bca41a118b1
Reviewed-on: https://go-review.googlesource.com/c/go/+/567216
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Auto-Submit: Damien Neil <dneil@google.com>

slices: Delete clears the tail when j == len(s)

Fixes #65669

Change-Id: Ifd2011dd604fef399e4352b804fc2f6a9e74096e
Reviewed-on: https://go-review.googlesource.com/c/go/+/566237
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>

cmd/compile: fix early deadcode with label statement

CL 517775 moved early deadcode into unified writer. with new way to
handle dead code with label statement involved: any statements after
terminating statement will be considered dead until next label
statement.

However, this is not safe, because code after label statement may still
refer to dead statements between terminating and label statement.

It's only safe to remove statements after terminating *and* label one.

Fixes #65593

Change-Id: Idb630165240931fad50789304a9e4535f51f56e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/565596
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>

runtime: use MapMaxKeyBytes,MapMaxElemBytes,MapBucketCount of internal/abi

For #59670

Change-Id: I9265e033bf3a84c3dc7b4a5d52c0df9672435f0d
GitHub-Last-Rev: 8e4099095cec9e774abe9b72212a1eab6f6f9fdb
GitHub-Pull-Request: golang/go#64774
Reviewed-on: https://go-review.googlesource.com/c/go/+/550117
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: fix the potential race of idle P's during injectglist

Fixes #63555

Change-Id: I26e7baf58fcb78e66e0feed5725e371e25d657cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/550175
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>

runtime: don't clobber saved frame pointer during arm64 racecall

During calls to the race detector on arm64, we switch to the g0 stack if
we aren't already on it. If we are already on the g0 stack, the race
detector library code can then create a stack frame using the stack
pointer coming from Go code. The race detector library can go on to
write values to the top of its stack frame. But the Go ABI for arm64
saves the caller's frame pointer in the word below the current stack
frame. So, the saved frame pointer on the stack can be clobbered by the
race detector. Decrement the stack pointer to account for where the
frame pointer is saved, like we do for asmcgocall.

Change-Id: I66e5e4a671c3befc10776bac6869810ecf71790d
Reviewed-on: https://go-review.googlesource.com/c/go/+/561515
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

runtime: disable use of runnext on wasm

When readying a goroutine, the scheduler typically places the readied
goroutine in pp.runnext, which will typically be the next goroutine to
run in the schedule.

In order to prevent a set of ping-pong goroutines from simply switching
back and forth via runnext and starving the rest of the run queue, a
goroutine scheduled via runnext shares a time slice (pp.schedtick) with
the previous goroutine.

sysmon detects "long-running goroutines", which really means Ps using
the same pp.schedtick for too long, and preempts them to allow the rest
of the run queue to run. Thus this avoids starvation via runnext.

However, wasm has no threads, and thus no sysmon. Without sysmon to
preempt, the possibility for starvation returns. Avoid this by disabling
runnext entirely on wasm. This means that readied goroutines always go
on the end of the run queue and thus cannot starve via runnext.

Note that this CL doesn't do anything about single long-running
goroutines. Without sysmon to preempt them, a single goroutine that
fails to yield will starve the run queue indefinitely.

For #65178.

Change-Id: I10859d088776125a2af8c9cd862b6e071da628b5
Cq-Include-Trybots: luci.golang.try:gotip-js-wasm,gotip-wasip1-wasm_wasmtime,gotip-wasip1-wasm_wazero
Reviewed-on: https://go-review.googlesource.com/c/go/+/559798
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

cmd/compile/internal/noder: add method wrapper comments

Add commentary explaining why and how we create method wrappers.

Change-Id: Idf35a77d0483f24c2163e11f5e001fd5536cca63
Reviewed-on: https://go-review.googlesource.com/c/go/+/558395
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

net: Correct the code snippet erroneously rolled back in CL550435

In CL https://golang.org/cl/550435, a segment that had already been reviewed and modified was rolled back due to an erroneous operation. Here, submit a correct code snippet.

Change-Id: I46adfad110d532aec5f557c350fe6dccbc583968
Reviewed-on: https://go-review.googlesource.com/c/go/+/565628
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: qiulaidongfeng <2645477756@qq.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Mateusz Poliwczak <mpoliwczak34@gmail.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Commit-Queue: Ian Lance Taylor <iant@golang.org>

net/http: prevent redirect loop in serveFile if "/" is a normal file

When FileServer(Dir("file")) is used where "file" is a normal file and
not a directory, the server enters a redirect loop.

The usage of a file inplace of a directory path is not documented in
http.Dir and it could be considered undefined behavior.

This CL updates serveFile to check if we are trying to traverse a normal
file instead of a directory and return an error, preventing the redirect
loop.

Fixes #63769

Change-Id: I81e289444e7d0bd72189c2e7b763f5540333e2d0
GitHub-Last-Rev: 754c9a1167916b5a8c3c827391d7e4a2ff3bc44d
GitHub-Pull-Request: golang/go#63860
Reviewed-on: https://go-review.googlesource.com/c/go/+/538719
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
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net/http/pprof: avoid panic with user-defined "GET /" route

With the new routing style in go 1.22, declaring

    http.Handle("GET /", h)

generates a conflict with route "/debug/pprof/" and the others declared in
the net/http/pprof package. You get an error such as:

panic: pattern "GET /" (registered at .../pprof.go:94): GET / matches
fewer methods than /debug/pprof/, but has a more general path pattern

This patch prevents that error.  Adding GET is correct because no other
method makes sense with the /debug/pprof routes. However, a tool using any
method other than GET will break.

We preserve the traditional behaviour when GODEBUG=httpmuxgo121=1 is
specified.

Updates #65723

Change-Id: I49c21f5f3e802ad7538062d824354b2e4d8a800e
GitHub-Last-Rev: 35e4012663f454fee8f00a321c43592ce4754feb
GitHub-Pull-Request: golang/go#65791
Reviewed-on: https://go-review.googlesource.com/c/go/+/565176
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cmd/internal, cmd/link: unify the relocation naming style of loong64

Change-Id: I2990701e71a63af7bdd6851b6008dc63cb1c1a83
Reviewed-on: https://go-review.googlesource.com/c/go/+/535616
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
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Reviewed-by: Cherry Mui <cherryyz@google.com>
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go/types: added test case for Checker.CheckExpr

For #65898.

Change-Id: I495e53060ac56b88a551ccd9901f25bbce97c714
Reviewed-on: https://go-review.googlesource.com/c/go/+/567215
Reviewed-by: Alan Donovan <adonovan@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
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os: avoid GetFileInformationByHandleEx call when stat'ing files on Windows

os.Stat and os.Lstat on Windows use GetFileInformationByHandleEx to
retrieve file information for reparse points and files that
GetFileAttributesEx does not handle.

However, GetFileInformationByHandleEx is only necessary for
reparse points, so we can avoid the call for regular files.

With this change we can drop the FAT hack that was added in CL 154377,
as files won't have the FILE_ATTRIBUTE_REPARSE_POINT attribute set
on that file system.

Change-Id: Id18639067a6c3fa1bb2c6706d5b79358c224fe37
Reviewed-on: https://go-review.googlesource.com/c/go/+/566397
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
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doc: document os.ModeSocket support on Windows

Updates #33357.

Change-Id: I66866475447e03f604202f34ddfbafdc0512cb72
Reviewed-on: https://go-review.googlesource.com/c/go/+/565135
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reflect: fix typo in comment

Change-Id: Ia8e666b128622391d72e42449c01c4e10f3c9e1e
GitHub-Last-Rev: c74cf13b70772a965a14630108544a89690d1383
GitHub-Pull-Request: golang/go#65938
Reviewed-on: https://go-review.googlesource.com/c/go/+/566855
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: qiulaidongfeng <2645477756@qq.com>
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syscall: fix typo in comment

Change-Id: I1804315fd3ec50ab1e3f480efd92c59e36fd47d0
GitHub-Last-Rev: 07d969ab71eabfe7034b62f45a1f4058b66ee014
GitHub-Pull-Request: golang/go#65921
Reviewed-on: https://go-review.googlesource.com/c/go/+/566615
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Reviewed-by: Carlos Amedee <carlos@golang.org>

archive/tar: check returned error before use hdr

Change-Id: I8c28dac73427e37d58d970b00d8f0f1413bede2e
GitHub-Last-Rev: a11a8036028ecf6f811b1470becc924b77a2c734
GitHub-Pull-Request: golang/go#65932
Reviewed-on: https://go-review.googlesource.com/c/go/+/566695
Auto-Submit: Ian Lance Taylor <iant@google.com>
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html/template: replace bytes.Compare call with bytes.Equal

Change-Id: I1bd3fdf0ceb9a83dbcc07f55b81489eb2c82c9ba
GitHub-Last-Rev: 05d49d7fb921e59529f7105a93b4b7fba51ab525
GitHub-Pull-Request: golang/go#65418
Reviewed-on: https://go-review.googlesource.com/c/go/+/560115
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Reviewed-by: Ian Lance Taylor <iant@google.com>

encoding/xml: remove unnecessary fmt.Sprintf call

Change-Id: Iba6014340d8b697a3a26b35e8d5a702ccf332e10
GitHub-Last-Rev: ef60463c7b98c2bdabe6d04e0f86947b7f395765
GitHub-Pull-Request: golang/go#65872
Reviewed-on: https://go-review.googlesource.com/c/go/+/565841
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database/sql: wrap errors with %w in driverArgsConnLocked

Use fmt.Errorf %w verb to wrap errors in driverArgsConnLocked,
which allows for easier unwrapping and checking of error types.

Add tests in sql_test.go to ensure that Stmt.Exec and Stmt.Query
correctly wrap underlying Valuer errors, adhering to the new change.

Fixes #64707.

Change-Id: Id9f80e265735d0849ee7abba63e58e4c26e658ad
GitHub-Last-Rev: 0df367e0fb5b213513d4e0ab7f5a87984798f96d
GitHub-Pull-Request: golang/go#64728
Reviewed-on: https://go-review.googlesource.com/c/go/+/550116
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
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cmd/compile: use quotes to wrap user-supplied token

Use quotes to wrap user-supplied token in the syntax error message.
Updates #65790

Change-Id: I631a63df4a6bb8615b7850a324d812190bc15f30
GitHub-Last-Rev: f291e1d5a6adee558d21bb7e0a3a17471bad7eb6
GitHub-Pull-Request: golang/go#65840
Reviewed-on: https://go-review.googlesource.com/c/go/+/565518
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go/types, types2: fix typo in comment

Change-Id: I410c5fdd9fa3aa7ce5eb1d688621c7684f03a6f9
GitHub-Last-Rev: c3f53de27fb8602b500180242e0be274dc242f8d
GitHub-Pull-Request: golang/go#65950
Reviewed-on: https://go-review.googlesource.com/c/go/+/566858
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html/template: escape additional tokens in MarshalJSON errors

Escape "</script" and "<!--" in errors returned from MarshalJSON errors
when attempting to marshal types in script blocks. This prevents any
user controlled content from prematurely terminating the script block.

Fixes #65697

Change-Id: Icf0e26c54ea7d9c1deed0bff11b6506c99ddef1b
Reviewed-on: https://go-review.googlesource.com/c/go/+/564196
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net/http: reject client-side retries in server timeout tests

This breaks an unbounded client-side retry loop if the server's
timeout happens to fire during its final read of the TLS handshake.

The retry loop was observed on wasm platforms at CL 557437.
I was also able to reproduce chains of dozens of retries on my
linux/amd64 workstation by adjusting some timeouts and adding a couple
of sleeps, as in this patch:
https://gist.github.com/bcmills/d0a0a57e5f64eebc24e8211d8ea502b3
However, on linux/amd64 on my workstation the test always eventually
breaks out of the retry loop due to timing jitter.

I couldn't find a retry-specific hook in the http.Client,
http.Transport, or tls.Config structs, so I have instead abused the
Transport.Proxy hook for this purpose. Separately, we may want to
consider adding a retry-specific hook, or changing the net/http
implementation to avoid transparently retrying in this case.

Fixes #65410.
Updates #65178.

Change-Id: I0e43c039615fe815f0a4ba99a8813c48b1fdc7e6
Reviewed-on: https://go-review.googlesource.com/c/go/+/559835
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std: fix more nilness findings

(found with x/tools/go/analysis/passes/nilness)

Change-Id: I1bdc7811efbecea95608e634f894cb6c656e3a5b
Reviewed-on: https://go-review.googlesource.com/c/go/+/564221
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cmd/gofmt: remove impossible err!=nil conditional

Change-Id: Ife63c766cefc14d2f6bdd3c706f913b1b6f99949
GitHub-Last-Rev: 04e23349e68a3ce12b7d33c0fd3ad8c7ffbd8aaa
GitHub-Pull-Request: golang/go#65929
Reviewed-on: https://go-review.googlesource.com/c/go/+/566099
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net: use bytealg.IndexByte in cgoLookupAddrPTR

Change-Id: I76f4dc1e8bda98936c1198cb45ce8141ca88845b
Reviewed-on: https://go-review.googlesource.com/c/go/+/566235
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crypto/tls: fix typo in comment

Change-Id: I77371ef99797e2b53f1292c9d6a4eb157f116f88
GitHub-Last-Rev: 7ce7d014c0c46b320f9e4b742ae9360d1b5cf4dc
GitHub-Pull-Request: golang/go#65836
Reviewed-on: https://go-review.googlesource.com/c/go/+/565440
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crypto/ecdsa: fix typo

Change-Id: I32580ffb31ffad05a7c8d3aa0c491aff9f55ea6a
GitHub-Last-Rev: 67516eaa18923f0f59a69e82b74ecba74af387d4
GitHub-Pull-Request: golang/go#65565
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os: add available godoc link

Change-Id: I430c9a7c4936d7a8c8c787aa63de9a796d20fdf3
Reviewed-on: https://go-review.googlesource.com/c/go/+/539597
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cmd/go: print the package containing the unmatched embed patterns

Fixes #49534

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syscall: add available godoc link

Change-Id: I0fcb79f471cdb8b464924d9b04c675f120861f67
Reviewed-on: https://go-review.googlesource.com/c/go/+/539835
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text: add available godoc link

Change-Id: Idbc110cfc4fd6bbbc8b79807ac14abf7b30e0e65
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regexp: add available godoc link

Signed-off-by: cui fliter <imcusg@gmail.com>
Change-Id: I85339293d4cfb691125f991ec7162e9be186efdc
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sync: add available godoc link

Change-Id: I9bc5fd29b0eec8ceadcfee2116de5e7524ef92c2
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doc/next: add the missing slashes ahead of net#Dialer and net#ListenConfig

Change-Id: I216189f181ee73d16602c5cc86eb4d6b439a142b
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crypto/x509: fix typo

Change-Id: I0911c59280e4a208a3deee1f70b47adc60fb734b
GitHub-Last-Rev: 12e95ade68c2f2dd8f87126eae9f3a75841ec8bc
GitHub-Pull-Request: golang/go#65833
Reviewed-on: https://go-review.googlesource.com/c/go/+/565439
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net/netip: introduce parsePrefixError for better error handling

Refactor ParsePrefix to return a parsePrefixError containing the input
string and a detailed message on failure, improving error context and
maintaining consistent error formatting within the netip package.

Change-Id: I8d9fb2f833b0f96f43a14622e66e225b54440410
GitHub-Last-Rev: e17bec3afa4efd6c52463bb93e8f694b42c0c2b7
GitHub-Pull-Request: golang/go#65798
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net: don't force cgo resolver for .local subdomain queries

The cgo resolver sends DNS queries for .local subdomain
lookups, just as we do in the go resolver.
We don't need to fallback to the cgo resolver for this
domains when nsswitch.conf uses only file and dns modules.

This has a benefit that we select a consistent resolver,
that is only based on the system configuration, regardless
of the queried domain.

Updates #63978

Change-Id: I9166103adb94d7ab52992925f413f361130e7c52
GitHub-Last-Rev: e2bc5874cb5c9165e3cc058e9effe36d0ce68cd6
GitHub-Pull-Request: golang/go#63986
Reviewed-on: https://go-review.googlesource.com/c/go/+/540555
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Reviewed-by: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Michael Pratt <mpratt@google.com>

time: use bytealg.IndexByte in byteString

Change-Id: I0d42bca7c6ee63c05a0ca09c165f2f591edf7c34
Reviewed-on: https://go-review.googlesource.com/c/go/+/565356
Auto-Submit: Ian Lance Taylor <iant@google.com>
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Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>

cmd/compile/internal/dwarfgen: refactor putvar and putAbstractVar

Currently, changing putvar or putAbstractVar involves:

1. changing the abbrevs array to add new abbrevs or modify existing ones
2. changing the DW_ABRV_XXX const block to add the new abbrevs, this const
   block must match the changes to the abbrevs array
3. change the code at the start of putvar and putAbstractVar that selects
   the abbrev to use
4. change the body of putvar/putAbstractVar to emit the right attributes in
   the right sequence

Each change must agree with all other, this is error prone and if an mistake
is made there is no compile time or runtime check detecting it. Erroneous
code will simply produce unreadable debug sections.

This commit adds a mechanism to automatically generate code for abbrev
selection as well as the abbrev definitions based on static examination of
the body of putvar and putAbstractVar.

TestPutVarAbbrevGenerator is responsible for checking that the generated
code is kept updated and will regenerated it by passing the '-generate'
option to it.

benchstat output:

                         |    old.txt    |               new.txt                |
                         |    sec/op     |    sec/op      vs base               |
Template                    153.8m ±  6%    153.0m ±  6%       ~ (p=0.853 n=10)
Unicode                     98.98m ± 19%   100.22m ± 15%       ~ (p=0.796 n=10)
GoTypes                    1013.7m ± 13%    943.6m ±  8%       ~ (p=0.353 n=10)
Compiler                    98.48m ± 10%    97.79m ±  6%       ~ (p=0.353 n=10)
SSA                          8.921 ± 31%     6.872 ± 37%       ~ (p=0.912 n=10)
Flate                       114.3m ± 21%    128.0m ± 36%       ~ (p=0.436 n=10)
GoParser                    219.0m ± 27%    214.9m ± 26%       ~ (p=0.631 n=10)
Reflect                     447.5m ± 20%    452.6m ± 22%       ~ (p=0.684 n=10)
Tar                         166.9m ± 27%    166.2m ± 27%       ~ (p=0.529 n=10)
XML                         218.6m ± 25%    219.3m ± 24%       ~ (p=0.631 n=10)
LinkCompiler                492.7m ± 12%    523.2m ± 13%       ~ (p=0.315 n=10)
ExternalLinkCompiler         1.684 ±  3%     1.684 ±  2%       ~ (p=0.684 n=10)
LinkWithoutDebugCompiler    296.0m ±  8%    304.9m ± 12%       ~ (p=0.579 n=10)
StdCmd                       69.59 ± 15%     70.76 ± 14%       ~ (p=0.436 n=10)
geomean                     516.0m          511.5m        -0.87%

                         |   old.txt    |               new.txt               |
                         | user-sec/op  | user-sec/op   vs base               |
Template                   281.5m ± 10%   269.6m ± 13%       ~ (p=0.315 n=10)
Unicode                    107.3m ±  8%   110.2m ±  8%       ~ (p=0.165 n=10)
GoTypes                     2.414 ± 16%    2.181 ±  9%       ~ (p=0.315 n=10)
Compiler                   116.0m ± 16%   119.1m ± 11%       ~ (p=0.971 n=10)
SSA                         25.47 ± 39%    17.75 ± 52%       ~ (p=0.739 n=10)
Flate                      205.2m ± 25%   256.2m ± 43%       ~ (p=0.393 n=10)
GoParser                   456.8m ± 28%   427.0m ± 24%       ~ (p=0.912 n=10)
Reflect                    960.3m ± 22%   990.5m ± 23%       ~ (p=0.280 n=10)
Tar                        299.8m ± 27%   307.9m ± 27%       ~ (p=0.631 n=10)
XML                        425.0m ± 21%   432.8m ± 24%       ~ (p=0.353 n=10)
LinkCompiler               768.1m ± 11%   796.9m ± 14%       ~ (p=0.631 n=10)
ExternalLinkCompiler        1.713 ±  5%    1.666 ±  4%       ~ (p=0.190 n=10)
LinkWithoutDebugCompiler   313.0m ±  9%   316.7m ± 12%       ~ (p=0.481 n=10)
geomean                    588.6m         579.5m        -1.55%

          |   old.txt    |                new.txt                |
          |  text-bytes  |  text-bytes   vs base                 |
HelloSize   842.9Ki ± 0%   842.9Ki ± 0%       ~ (p=1.000 n=10) ¹
CmdGoSize   10.95Mi ± 0%   10.95Mi ± 0%       ~ (p=1.000 n=10) ¹
geomean     3.003Mi        3.003Mi       +0.00%
¹ all samples are equal

          |   old.txt    |                new.txt                |
          |  data-bytes  |  data-bytes   vs base                 |
HelloSize   15.08Ki ± 0%   15.08Ki ± 0%       ~ (p=1.000 n=10) ¹
CmdGoSize   314.7Ki ± 0%   314.7Ki ± 0%       ~ (p=1.000 n=10) ¹
geomean     68.88Ki        68.88Ki       +0.00%
¹ all samples are equal

          |   old.txt    |                new.txt                |
          |  bss-bytes   |  bss-bytes    vs base                 |
HelloSize   396.8Ki ± 0%   396.8Ki ± 0%       ~ (p=1.000 n=10) ¹
CmdGoSize   428.8Ki ± 0%   428.8Ki ± 0%       ~ (p=1.000 n=10) ¹
geomean     412.5Ki        412.5Ki       +0.00%
¹ all samples are equal

          |   old.txt    |               new.txt               |
          |  exe-bytes   |  exe-bytes    vs base               |
HelloSize   1.310Mi ± 0%   1.310Mi ± 0%  -0.01% (p=0.000 n=10)
CmdGoSize   16.37Mi ± 0%   16.37Mi ± 0%  -0.00% (p=0.000 n=10)
geomean     4.631Mi        4.631Mi       -0.00%

Change-Id: I7edf37b5a47fd9aceef931ddf2c701e66a7b38b2
Reviewed-on: https://go-review.googlesource.com/c/go/+/563815
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
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sync: simplify the code with atomic.Pointer

Change-Id: I79797be6b385c9927d68350334d7f7387007085f
GitHub-Last-Rev: 3daa3b144f55f527d183d4ff35475ca4af3ee143
GitHub-Pull-Request: golang/go#65937
Reviewed-on: https://go-review.googlesource.com/c/go/+/566815
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Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Commit-Queue: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

path/filepath: add Localize

Add the Localize function, which takes an io/fs slash-separated path
and returns an operating system path.

Localize returns an error if the path cannot be represented on
the current platform.

Replace internal/safefile.FromFS with Localize,
which serves the same purpose as this function.

The internal/safefile package remains separate from path/filepath
to avoid a dependency cycle with the os package.

Fixes #57151

Change-Id: I75c88047ddea17808276761da07bf79172c4f6fc
Reviewed-on: https://go-review.googlesource.com/c/go/+/531677
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net/http: allow multiple spaces between method and path in mux patterns

Fixes #64910

Change-Id: I14fd1e35c95b14591e3ad7b889dc1ab19a008730
GitHub-Last-Rev: b8d436cdee93d103703e7e6d4bb28315c5035300
GitHub-Pull-Request: golang/go#65868
Reviewed-on: https://go-review.googlesource.com/c/go/+/565916
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Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>

expvar: avoid conflict with user-defined "GET /" route.

With the new routing style in go 1.22, declaring

    http.Handle("GET /", h)

generates a conflict with route "/debug/vars" declared in the expvar
package. You get an error such as:

panic: pattern "GET /" (registered at ...) conflicts with pattern
"/debug/vars" (registered at ...expvar.go:384): GET / matches fewer
methods than /debug/vars, but has a more general path pattern

This patch prevents that error.  Adding GET is correct because no other
method makes sense with /debug/vars.

We preserve the traditional behaviour when GODEBUG=httpmuxgo121=1 is
specified.

Fixes #65723

Change-Id: Id2b963ebad41a1ebdcceb73baf3436d59aac73a0
GitHub-Last-Rev: 9c2b9f74a7c8a3c756e9948814231b8f4e60b216
GitHub-Pull-Request: golang/go#65745
Reviewed-on: https://go-review.googlesource.com/c/go/+/564735
Reviewed-by: Damien Neil <dneil@google.com>
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runtime/coverage: remove refs to deprecated io/ioutil

Change-Id: I66965e6a61cf1726db06670978a4654b84f3fd72
GitHub-Last-Rev: 90023e48435029c94a316413b30e46c9ce0019d5
GitHub-Pull-Request: golang/go#65900
Reviewed-on: https://go-review.googlesource.com/c/go/+/566356
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Reviewed-by: Jorropo <jorropo.pgm@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

path/filepath: support multiple TestAbs runs on Windows

TestAbs modifies the absTests global variable on Windows, which makes
the test to fail if it is run more than once, i.e. executing
"go test -run ^TestAbs$ -count 2 path/filepath".

This CL fixes the issue by clipping the absTests slices before
appending more elements to it.

Change-Id: I8f1144b2f10b8fa1b847e6639c0bda7baafc2dac
Reviewed-on: https://go-review.googlesource.com/c/go/+/566396
Reviewed-by: Bryan Mills <bcmills@google.com>
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text/template: add "else with" action

Add "else with" action will reduce the template complexity in some use cases(#57646).
This action will be added:
  {{with pipeline}} T1 {{else with pipeline}} T0 {{end}}.

Fixes #57646

Change-Id: I90ed546ab671805f753343b00bd3c9d1a1d5581d
Reviewed-on: https://go-review.googlesource.com/c/go/+/545376
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Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

net/http: make FileServer look good on mobile

Currently when viewing directories on a phone, the text is small and
often hard to tap correctly.  This commit adds the viewport property to
the page to make it look correct on phones.  This commit also makes the
page behave in Standards Mode instead of Quirks Mode which does not
effect the behavior of this page but makes me feel good inside ☺️

Change-Id: I4babcf79085e85fba57453b7a235e4750a269a42
Reviewed-on: https://go-review.googlesource.com/c/go/+/552595
Auto-Submit: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Max Coplan <mchcopl@gmail.com>

net: skip TestReadLine if /etc/services does not exist

Fixes #65905

Change-Id: I42326d3b743e80d5226ea374eca5c9edaef4dd4d
Reviewed-on: https://go-review.googlesource.com/c/go/+/566535
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Reviewed-by: Damien Neil <dneil@google.com>
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