On 32-bit architectures without native 64-bit atomic instructions,
64-bit atomics are emulated using spinlocks. However,
the sigprof handling code expects to be able to perform
64-bit atomic operations in signal handlers. Spinning on an
acquired spinlock in a signal handler leads to a livelock.
This is issue #20146.

The original fix for #20146 did not include arm in
the list of architectures that need to work around portability
issues in the sigprof handler code. The unit test designed to
catch this issue does not fail on arm builds because arm uses
striped spinlocks, and thus the livelock takes many minutes
to reproduce. This is issue #24260. (This patch doesn't completely
fix #24260 on go1.10.2 due to issue #25785, which is probably
related to the arm cas kernel helpers. Those have been removed
at tip.)

With this patch applied, I was able to run the reproducer for
issue #24260 for more than 90 minutes without reproducing the
livelock. Without this patch, the livelock took as little as
8 minutes to reproduce.

Fixes #20146
Updates #24260

Change-Id: I64bf53a14d53c4932367d919ac55e17c99d87484
Reviewed-on: https://go-review.googlesource.com/117057
Run-TryBot: Philip Hofer <phofer@umich.edu>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

CL 116975 added TestCoverHTML. However, this test is failing
on Plan 9, because the GNU diff tool is called "ape/diff"
instead of "diff" on Plan 9.

This change replaces the "diff" command by the "ape/diff"
command on Plan 9.

Fixes #25795.

Change-Id: I15b49868cd09f3f977aa13fffdfc430c882bf757
Reviewed-on: https://go-review.googlesource.com/117415
Run-TryBot: David du Colombier <0intro@gmail.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Turns out it doesn't currently matter, as these ops are always issued
together with a BTSL which does clobber flags. So I can't write a test
that currently fails. But better to be future-proof.

BS{F,R}Q generates flags, so it doesn't need to be marked as clobbering.

Change-Id: I70daea154023fd435fac696bf3a384803c647cd3
Reviewed-on: https://go-review.googlesource.com/117375
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Solaris diff doesn't know about -d (a.k.a. --minimal).

Change-Id: I86146b4b93e3d0bdea52a0fde59afca20b5bab51
Reviewed-on: https://go-review.googlesource.com/117335Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

This is a refinement of CL 114855, which fixed the empty clause case,
but broke some other cases where segment boundaries can coincide
for other reasons.

Fixes #25767.

Change-Id: I2a387c83f9d651c8358f3e11b03f6167af0eb8bf
Reviewed-on: https://go-review.googlesource.com/116976
Run-TryBot: David Symonds <dsymonds@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

This change improves upon cycle detection by taking into account
cycles involving constants, variables, _and_ types. All new code
(except for the additional tests) is guarded by the useCycleMarking
(internal) flag and thus can be disabled on short notice if it
introduced new problems. (The intent is to remove this flag shortly
after 1.11 is released.)

The test suite has been extended with various additional (and mostly
esoteric) test cases which now correctly report cycles. A handful of
existing test cases now report additional errors, but those are mostly
esoteric cases. Overall, this is an improvement over the status quo.

Fixes #8699.
For #20770.

Change-Id: I6086719acd0d5200edca4a3dbe703d053496af31
Reviewed-on: https://go-review.googlesource.com/116815
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>

This adds a case for what was fixed in 4fe688c6 to prevent regression;
a follow-on change will address #25767.

Change-Id: Iced8cc10e2993ef7caf7e9c59ffbc7147d78ddd7
Reviewed-on: https://go-review.googlesource.com/116975
Run-TryBot: David Symonds <dsymonds@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

If a package is checked out in the right place, but uses, for instance,
an unusual Git remote configuration, don't refuse to update just because
cmd/go can't parse it. In most cases, `git pull -ff-only` (or the
equivalent in other VCSes) works just fine.

Updates #25432.

Change-Id: I1952a0e6e03f185f34029b186e1756c9549689e1
Reviewed-on: https://go-review.googlesource.com/113456
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

Users are sometimes confused why session tickets are not enabled even if
SessionTicketsDisabled is false.

Change-Id: I3b783d2cf3eed693a3ad6acb40a8003db7e0b648
Reviewed-on: https://go-review.googlesource.com/117255Reviewed-by: Adam Langley <agl@golang.org>

Prior to CL 108156, "go list" exited with code 0 if there were missing binary packages.
Restore that behavior to fix the failing TestBinaryOnlyPackages.

Fixes golang/go#25784.

Change-Id: Iaeca6bcc840f5ac8f2a016cef131f5c59a8261a8
Reviewed-on: https://go-review.googlesource.com/117036Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Fixes #20849

Change-Id: If2a330185aa7e95eb84dccdbc4c7f3e9b970cca1
Reviewed-on: https://go-review.googlesource.com/117056Reviewed-by: Matti Moell <matti.moell@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Updates #25784

Change-Id: I638eab82b026d3df89da532b5cc3f5c06b02d6c8
Reviewed-on: https://go-review.googlesource.com/117075Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>

Code has ended up depending on things like RSA's key generation being
deterministic given a fixed random Reader. This was never guaranteed and
would prevent us from ever changing anything about it.

This change makes certain calls randomly (based on the internal
fastrand) read an extra byte from the random Reader. This helps to
ensure that code does not depend on internal details.

I've not added this call in the key generation of ECDSA and DSA because,
in those cases, key generation is so obvious that it probably is
acceptable to do the obvious thing and not worry about code that depends
on that.

This does not affect tests that use a Reader of constant bytes (e.g. a
zeroReader) because shifting such a stream is a no-op. The stdlib uses
this internally (which is fine because it can be atomically updated if
the crypto libraries change).

It is possible that external tests could be doing the same and would
thus break if we ever, say, tweaked the way RSA key generation worked.
I feel that addressing that would be more effort than it's worth.

Fixes #21915

Change-Id: I84cff2e249acc921ad6eb5527171e02e6d39c530
Reviewed-on: https://go-review.googlesource.com/64451Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>

CL 113837 introduced some changes which were not properly gofmt'ed, fix them.

Change-Id: I89329063f9c468238051e45380d752e66efdb939
Reviewed-on: https://go-review.googlesource.com/116895
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: Ie355f06e9be93d7f7501f697a94ff83d6d0826a2
Reviewed-on: https://go-review.googlesource.com/114556Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: Idd88a1d9420545e3e326f8e3b57a38d8c7515555
GitHub-Last-Rev: 59528f552238eb4070cb9a66c1dbfafd6bc3808d
GitHub-Pull-Request: golang/go#25779
Reviewed-on: https://go-review.googlesource.com/116935Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

These got lost because I violated the cardinal rule of Gerrit
which is never click the Submit button in the web UI.

Change-Id: I8ccdfb5d8691960f244941036d33fb5a5a3f0c9a
Reviewed-on: https://go-review.googlesource.com/117015Reviewed-by: Russ Cox <rsc@golang.org>

This is needed when we are re-building to the wasm target.

Fixes #25774

Change-Id: I5dc47bd7e56c8570b8d2485273ef0d10f2feac6f
Reviewed-on: https://go-review.googlesource.com/116915Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

We want package analysis tools to be able to ask cmd/go for
cgo-translated files and for the names of files holding export
type information, instead of reinventing that logic themselves.
Allow them to do so, with the new list -cgo and -export flags.

Change-Id: I860df530d8dcc130f1f328413381b5664cc81c3b
Reviewed-on: https://go-review.googlesource.com/108156
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

They are unused since CL 114799.

Also remove consts _CTL_KERN and _KERN_OSRELEASE previously used by
getDarwinVersion.

Change-Id: I51b701e8effbe4dd4301b0e6d52e8885469032f4
Reviewed-on: https://go-review.googlesource.com/116955
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Removing the colon will make the "Usage" and "Command line flag syntax" in the docs, a header when interpreted by godoc.

Fixes #25749

Change-Id: Ifc5572e171db1aaef9775b1d6c86091a8f2528fd
GitHub-Last-Rev: 1b579734308cbcb96f17d945b9c7af70e259cb5b
GitHub-Pull-Request: golang/go#25750
Reviewed-on: https://go-review.googlesource.com/116555Reviewed-by: Rob Pike <r@golang.org>

This function was added during the Go 1.11 dev cycle and isn't part of
the API compatibility promise yet.

In the previous implementation, NewGCMWithNonceAndTagSize was being used
as a helper function for NewGCM, NewGCMWithTagSize, and NewGCMWithNonceSize.
With the removal of Nonce size from the name and parameters, we needed to
add an unexported helper function newGCMWithNonceAndTagSize.

Fixes #24977

Change-Id: Ie70f2a192d0556c4f890deb62e68cff6bbbccd33
Reviewed-on: https://go-review.googlesource.com/116435Reviewed-by: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

This line of the inlining tuning experiment
https://go-review.googlesource.com/c/go/+/109918/1/src/cmd/compile/internal/gc/inl.go#347
was incorrectly rewritten in a later patch to use the call
cost, not the panic cost, and thus the inlining of panic
didn't occur when it should.  I discovered this when I
realized that tests should have failed, but didn't.

Fix is to make the correct change, and also to modify the
tests that this causes to fail.  One test now asserts the
new normal, the other calls "ppanic" instead which is
designed to behave like panic but not be inlined.

Change-Id: I423bb7f08bd66a70d999826dd9b87027abf34cdf
Reviewed-on: https://go-review.googlesource.com/116656
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

Missed this in the prior submit.

For #24182.

Change-Id: If8349d39c80b7ff57bc0c857985f9e52241321b8
Reviewed-on: https://go-review.googlesource.com/116775
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Such errors are likely spurious and caused by previously reported
errors; they don't add valuable information. Simply drop them.

Fixes #24182.

Change-Id: I0ac48c41647c628aa7636b29eaedfd9d01913762
Reviewed-on: https://go-review.googlesource.com/116735Reviewed-by: Alan Donovan <adonovan@google.com>

Fixes #25330

Change-Id: I41b5b3459ed7808d18112ec02d734e2268099a81
Reviewed-on: https://go-review.googlesource.com/116596Reviewed-by: Daniel Theophanes <kardianos@gmail.com>

Change-Id: I77e31954f6d92f769934843bbba9f990f330f50a
Reviewed-on: https://go-review.googlesource.com/116675Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

SecKeychainItemExport is deprecated as of macOS 10.7. The minimum
supported version is macOS 10.10, so use SecItemExport instead.

While at it also bump macosx-version-min to 10.10 and
__MAC_OS_X_VERSION_MAX_ALLOWED to 101300 (for macOS 10.13).

Tested on macOS 10.10, 10.11 and 10.12.

Updates #23122

Change-Id: Id4cd6a5cea93315791253dc248e40e5615760a6c
Reviewed-on: https://go-review.googlesource.com/116396Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Every action has a short annotation.
The errorCheck function has a comment adapted from errchk script.

Removed redundant assigments to tmpDir.

Change-Id: Ifdd1284de046a0ce2aad26bd8da8a8e6a7707a8e
Reviewed-on: https://go-review.googlesource.com/115856
Run-TryBot: Yury Smolsky <yury@smolsky.by>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The wasm archtecture was missing a rule to handle OffPtr with a
negative offset. This commit makes it so OffPtr always gets lowered
to I64AddConst.

Fixes #25741

Change-Id: I1d48e2954e3ff31deb8cba9a9bf0cab7c4bab71a
Reviewed-on: https://go-review.googlesource.com/116595Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>

Updates #25284

Change-Id: I8ca382dd85b428ad6899d9277cf7f3ce34e35e9a
Reviewed-on: https://go-review.googlesource.com/116416
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>

Also, add a benchmark variant ("SkipServe") that only benchmarks the
ServeMux handler selection path.

name                  old time/op    new time/op    delta
ServeMux_SkipServe-4    74.2µs ± 2%    60.6µs ± 1%   -18.31%   (p=0.000 n=10+9)

name                  old alloc/op   new alloc/op   delta
ServeMux_SkipServe-4    2.62kB ± 0%   0.00kB ±NaN%  -100.00%  (p=0.000 n=10+10)

name                  old allocs/op  new allocs/op  delta
ServeMux_SkipServe-4       180 ± 0%        0 ±NaN%  -100.00%  (p=0.000 n=10+10)

Updates #25383

Change-Id: Icfbb3b977e309093d032e922d1b4f254df6f5955
Reviewed-on: https://go-review.googlesource.com/116378
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>

When using test -cover or -coverprofile the output for "no test files"
is the same format as for "no tests to run".

Fixes #24570

Change-Id: If05609411676d42d94c1feac4bc839974fae2cc1
Reviewed-on: https://go-review.googlesource.com/115095
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

There is no benefit in continuing compilation if there
are type-checking errors. This will increase robustness
of the compiler in the presence of errors.

Fixes #22909.

Change-Id: I1c70c667e5927646ba3d0f370e33705165620f12
Reviewed-on: https://go-review.googlesource.com/116335Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: Ifc774bb9267baa773e91c617204329d3e04bd4b7
Reviewed-on: https://go-review.googlesource.com/116363Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

Change-Id: I10dededb41162a99dbc42792a9d314c6dabddcca
Reviewed-on: https://go-review.googlesource.com/116362Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

Found while tracking down another issue.

Change-Id: If06eee72ce3e3f45dc00b3b68670e1e4d99c87a7
Reviewed-on: https://go-review.googlesource.com/116455
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Fixes #25019

Change-Id: I715e3bb560b2a0301240cecb09a5126ab04a666e
Reviewed-on: https://go-review.googlesource.com/116375Reviewed-by: Ian Lance Taylor <iant@golang.org>

In the old binary export format, parameter names for parameter lists
which contained only types where never written, so this problem didn't
come up.

Fixes #25101.

Change-Id: Ia8b817f7f467570b05f88d584e86b6ef4acdccc6
Reviewed-on: https://go-review.googlesource.com/116376Reviewed-by: Matthew Dempsky <mdempsky@google.com>

gccgo fails this test before CL 115577.

Updates #25284

Change-Id: Id4550b7b3e268f3c294420ed31c57ad3f1002b5e
Reviewed-on: https://go-review.googlesource.com/115635
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>