Currently, the following example cannot run in playground:

    func a() {
        fmt.Println("A")
    }

    func ExampleA() {
        a()
    }

This CL solves it.

Fixes #23095

Change-Id: I5a492ff886a743f20cb4ae646e8453bde9c5f0da
Reviewed-on: https://go-review.googlesource.com/83615
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

This adds support for RSASSA-PSS signatures in handshake messages as
required by TLS 1.3. Even if TLS 1.2 is negotiated, it must support PSS
when advertised in the Client Hello (this will be done later as the
testdata will change).

Updates #9671

Change-Id: I8006b92e017453ae408c153233ce5ccef99b5c3f
Reviewed-on: https://go-review.googlesource.com/79736Reviewed-by: Filippo Valsorda <filippo@golang.org>

On some systems removing files can cause a directory to be re-shuffled,
so simply continuing to read files can cause us to miss some.
Close and re-open the directory when looping, to avoid that.

Read more files each time through the loop, to reduce the chance of
having to re-open.

Fixes #20841

Change-Id: I98a14774ca63786ad05ba5000cbdb01ad2884332
Reviewed-on: https://go-review.googlesource.com/121255
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The current implementation does not generate wrappers for methods of
embedded non-interface types. We can only skip the wrapper if
kindDirectIface of the generated struct type matches kindDirectIface
of the embedded type. Panic if that is not the case.

It would be better to actually generate wrappers, but that can be done
later.

Updates #15924
Fixes #24782

Change-Id: I01f5c76d9a07f44e1b04861bfe9f9916a04e65ca
Reviewed-on: https://go-review.googlesource.com/121316Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Allow a zone to be included with the ip address that is parsed when
using DefaultResolver's LookupHost or LookupIPAddr

Fixes #20790
Fixes #20767

Change-Id: I4e0baf9ade6a095af10a1b85ca6216788ba680ae
Reviewed-on: https://go-review.googlesource.com/79935
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The new function js.TypedArrayOf returns a JavaScript typed array for
a given slice.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Typed_arrays

This change also changes js.ValueOf to not accept a []byte any more.

Fixes #25532.

Change-Id: I8c7bc98ca4e21c3514d19eee7a1f92388d74ab2a
Reviewed-on: https://go-review.googlesource.com/121215
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The current resolver uses a global lookupGroup which merges LookupIPAddr
calls together for lookups for the same hostname if used concurrently.
As a result only one of the resolvers is actually used to perform the
DNS lookup but the result is shared by all the resolvers.

This commit limits the scope of the lookupGroup to the resolver itself
allowing each resolver to make its own requests without sharing the
result with other resolvers.

Fixes #22908

Change-Id: Ibba896eebb05e59f18ce4132564ea1f2b4b6c6d9
Reviewed-on: https://go-review.googlesource.com/80775
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This patch ports the existing optimized P256 implementation to arm64.

name            old time/op    new time/op    delta
pkg:crypto/ecdsa goos:linux goarch:arm64
SignP256           539µs ±13%      43µs ± 2%  -91.95%  (p=0.000 n=20+20)
SignP384          13.2ms ± 1%    13.2ms ± 1%     ~     (p=0.739 n=10+10)
VerifyP256        1.57ms ± 0%    0.12ms ± 0%  -92.40%  (p=0.000 n=18+20)
KeyGeneration      391µs ± 0%      25µs ± 0%  -93.62%  (p=0.000 n=9+9)
pkg:crypto/elliptic goos:linux goarch:arm64
BaseMult          1.66ms ± 0%    1.65ms ± 1%     ~     (p=0.079 n=9+10)
BaseMultP256       389µs ± 0%      22µs ± 1%  -94.28%  (p=0.000 n=19+20)
ScalarMultP256    1.03ms ± 0%    0.09ms ± 0%  -91.25%  (p=0.000 n=19+20)

name            old alloc/op   new alloc/op   delta
pkg:crypto/ecdsa goos:linux goarch:arm64
SignP256          5.47kB ± 0%    3.20kB ± 0%  -41.50%  (p=0.000 n=20+20)
SignP384          2.32MB ± 0%    2.32MB ± 0%     ~     (p=0.739 n=10+10)
VerifyP256        7.65kB ± 4%    0.98kB ± 0%  -87.24%  (p=0.000 n=20+20)
KeyGeneration     1.41kB ± 0%    0.69kB ± 0%  -51.05%  (p=0.000 n=9+10)
pkg:crypto/elliptic goos:linux goarch:arm64
BaseMult            224B ± 0%      224B ± 0%     ~     (all equal)
BaseMultP256      1.12kB ± 0%    0.29kB ± 0%  -74.29%  (p=0.000 n=20+20)
ScalarMultP256    1.59kB ± 7%    0.26kB ± 0%  -83.91%  (p=0.000 n=20+20)

name            old allocs/op  new allocs/op  delta
pkg:crypto/ecdsa goos:linux goarch:arm64
SignP256            67.0 ± 0%      35.0 ± 0%  -47.76%  (p=0.000 n=20+20)
SignP384           17.5k ± 0%     17.5k ± 0%     ~     (p=0.725 n=10+10)
VerifyP256          97.2 ± 3%      17.0 ± 0%  -82.52%  (p=0.000 n=20+20)
KeyGeneration       21.0 ± 0%      13.0 ± 0%  -38.10%  (p=0.000 n=10+10)
pkg:crypto/elliptic goos:linux goarch:arm64
BaseMult            5.00 ± 0%      5.00 ± 0%     ~     (all equal)
BaseMultP256        16.0 ± 0%       6.0 ± 0%  -62.50%  (p=0.000 n=20+20)
ScalarMultP256      19.9 ± 6%       5.0 ± 0%  -74.87%  (p=0.000 n=20+20)

Fixes #22806

Change-Id: I0f187074f8c3069bf8692d59e2cf95bdc6061fe7
Reviewed-on: https://go-review.googlesource.com/99755
Run-TryBot: Vlad Krasnov <vlad@cloudflare.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brendan McMillion <brendan@cloudflare.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Updates #19761

Change-Id: Iac3bd4c40002f8e348452b50bff54dee3210d447
Reviewed-on: https://go-review.googlesource.com/121236Reviewed-by: Ian Lance Taylor <iant@golang.org>

RFC 2045 doesn't permit non-ASCII bytes, but some systems send them
anyhow. With this change, we accept them. This does make it harder to
validate quotedprintable data, but on balance this seems like the best
approach given the existence of systems that generate invalid data.

Fixes #22597

Change-Id: I9f80f90a60b76ada2b5dea658b8dc8aace56cdbd
Reviewed-on: https://go-review.googlesource.com/121095Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

At least on Darwin, if getaddrinfo can't open a file descriptor it
returns EAI_NONAME ("no such host") rather than a meaningful error.
Limit the number of concurrent getaddrinfo calls to the number of file
descriptors we can open, to make that meaningless error less likely.

We don't apply the same limit to Go lookups, because for that we will
return a meaningful "too many open files" error.

Fixes #25694

Change-Id: I601857190aeb64f11e22b4a834c1c6a722a0788d
Reviewed-on: https://go-review.googlesource.com/121176Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Some headers, which are set or modified by the http library,
are not written to the standard http.Request.Header and are
not included as part of http.Response.Request.Header.

Exposing all headers alleviates this problem.

This is not a complete solution to 19761 since it does not have http/2 support.

Updates #19761

Change-Id: Ie8d4f702f4f671666b120b332378644f094e288b
Reviewed-on: https://go-review.googlesource.com/67430
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

On Wasm, the offset was not folded into LoweredAddr, so it was
not rematerializeable. This led to the address-taken operation
in some cases generated too early, before the local variable
becoming live. The liveness code thinks the variable live when
the address is taken, then backs it up to live at function
entry, then complains about it, because nothing other than
arguments should be live on entry.

This CL folds the offset into the address operation, so it is
rematerializeable and so generated right before use, after the
variable actually becomes live.

It might be possible to relax the liveness code not to think a
variable live when its address being taken, but until the address
actually being used. But it would be quite complicated. As we're
late in Go 1.11 freeze, it would be better not to do it. Also,
I think the address operation is rematerializeable now on all
architectures, so this is probably less necessary.

This may also be a slight optimization, as the address+offset is
now rematerializeable, which can be generated on the Wasm stack,
without using any "registers" which are emulated by local
variables on Wasm. I don't know how to do benchmarks on Wasm. At
least, cmd/go binary size shrinks 9K.

Fixes #25966.

Change-Id: I01e5869515d6a3942fccdcb857f924a866876e57
Reviewed-on: https://go-review.googlesource.com/120599
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Richard Musiol <neelance@gmail.com>

This is the same retry loop we use in _cgo_try_pthread_create in runtime/cgo.

Fixes #25078

Change-Id: I7ef4d4fc7fb89cbfb674c4f93cbdd7a033dd8983
Reviewed-on: https://go-review.googlesource.com/121096
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #21219

Change-Id: I1a2ec1afe06586ed33a3a855b77536490cac3a38
Reviewed-on: https://go-review.googlesource.com/121115
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #26042

Change-Id: Ica16f14a65c03659a19926852cca5e554c99baf1
Reviewed-on: https://go-review.googlesource.com/120935Reviewed-by: Ian Lance Taylor <iant@golang.org>

Revert the code changes of CL 96975 and CL 70931, but keep the tests,
appropriately modified for the code changes. This restores the 1.9
handling of form-data entries with missing or empty file names.

Changing the handling of this simply confused existing programs for no
useful benefit. Go back to the old behavior.

Updates #19183
Fixes #24041

Change-Id: I4ebc32433911e6360b9fd79d8f63a6d884822e0e
Reviewed-on: https://go-review.googlesource.com/121055
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Also updates comment on isConnected field of netFD for clarification.

Change-Id: Icb1b0332e3b4c7802eae00ddc26cd5ba54c82dc2
Reviewed-on: https://go-review.googlesource.com/120955
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

No code changes, only revised comments in an attempt to make
escape analysis slightly less confusing.

Updates #23109.

Change-Id: I5ee6cea0946ced63f6210ac4484a088bcdd862fb
Reviewed-on: https://go-review.googlesource.com/121001
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

documentation.

Fixes #25684.

Change-Id: I9d0e47dff2446c27a3df88fb9ccfefef7419470b
Reviewed-on: https://go-review.googlesource.com/120556Reviewed-by: Robert Griesemer <gri@golang.org>

NewInterface2 was introduced with https://go-review.googlesource.com/114317
which fixed #25301. Changed the name to NewInterfaceType to better match
Go naming styles, per discussion with @josharian, @iant, et al.

Change-Id: Ifa4708a5efd4f708295b33c3d20fdc5812e1b4fc
Reviewed-on: https://go-review.googlesource.com/120875Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

This commit changes how JavaScript values are referenced by Go code.
After this change, a JavaScript value is always represented by the same
ref, even if passed multiple times from JavaScript to Go. This allows
Go's == operator to work as expected on js.Value (strict equality).
Additionally, the performance of some operations of the syscall/js
package got improved by saving additional roundtrips to JavaScript code.

Fixes #25802.

Change-Id: Ide6ffe66c6aa1caf5327a2d3ddbe48fe7c180461
Reviewed-on: https://go-review.googlesource.com/120561
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: I589a60459a3b0811da77d46428eca57c741b1184
GitHub-Last-Rev: f9ab775b9d7f869916af6de9abb7c1d5f0005f1b
GitHub-Pull-Request: golang/go#26063
Reviewed-on: https://go-review.googlesource.com/120917Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Fixes #26025

Change-Id: I43b3c9019ca8d2844e4d664c2090e506b2171077
Reviewed-on: https://go-review.googlesource.com/120975Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The abbreviations list in zoneinfo_abbrs_windows.go was last updated
in June 2017, and it's currently outdated. Update it.

Change-Id: Ie2bf4268787f5aefe98ee110c2c279451e18fd97
Reviewed-on: https://go-review.googlesource.com/120559
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

Map delete must clear value every time because
newly added map optimizations of compound-assignment
operators (CL #91557) rely on this behavior of map delete.

It slows down map delete operation for non-reference types:

name                   old time/op    new time/op    delta
MapDelete/Int32/100      23.9ns ± 2%    27.8ns ± 4%  +16.04%  (p=0.000 n=20+20)
MapDelete/Int32/1000     21.5ns ± 2%    25.2ns ± 2%  +17.06%  (p=0.000 n=20+19)
MapDelete/Int32/10000    24.2ns ± 6%    27.2ns ± 5%  +12.39%  (p=0.000 n=19+19)
MapDelete/Int64/100      24.2ns ± 4%    27.7ns ± 2%  +14.55%  (p=0.000 n=20+20)
MapDelete/Int64/1000     22.1ns ± 2%    24.8ns ± 2%  +12.36%  (p=0.000 n=10+20)

Fixes #25936

Change-Id: I8499b790cb5bb019938161b3e50f3243d9bbb79c
Reviewed-on: https://go-review.googlesource.com/120255
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>

cmd/go can sometimes take up to 400s on windows due
to various issues (disk I/O on builders being the
latest cause). Increase the timeout scale to account
for this.

Change-Id: I1fd4964472a70fb0f33cf6ed73298c034b9c1fb0
Reviewed-on: https://go-review.googlesource.com/120762
Run-TryBot: Andrew Bonventre <andybons@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

For non-unit increment, loopbce checks to see if the
increment evenly divides the difference between (constant)
loop start and end.  This test panics when the increment
is zero.

Fix: check for zero, if found, don't optimize the loop.

Also added missing copyright notice to loopbce.go.

Fixes #26043.

Change-Id: I5f460104879cacc94481949234c9ce8c519d6380
Reviewed-on: https://go-review.googlesource.com/120759
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #26050

Change-Id: I21697ac30eb3bc423263cba885bce5fea8f81d94
Reviewed-on: https://go-review.googlesource.com/120796
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Bonventre <andybons@golang.org>

Beginning on Go 1.9, ServeMux has been dropping the port number from the Host
header and in the path pattern. This commit explicitly mentions the change in
behavior and adds a simple test case to ensure consistency.

Fixes #23351.

Change-Id: I0270c8bd96cda92c13ac6437cdf66c2807b3042d
Reviewed-on: https://go-review.googlesource.com/120557Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Reword the package summary to be a little easier to read.

Change-Id: I84a9301a02e228b46165410a429548b3774762d5
GitHub-Last-Rev: 1342c7219f0ed06144d3bca9acd77790707e4b77
GitHub-Pull-Request: golang/go#26052
Reviewed-on: https://go-review.googlesource.com/120795Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Previously, it would return an empty string if it
could not determine the user's cache directory.
Return an error instead.

Change-Id: I74f00b1ad3858efa3fe2700c599271ebfe5764b6
Reviewed-on: https://go-review.googlesource.com/120757
Run-TryBot: Andrew Bonventre <andybons@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

It will not be present in go1.11beta1 but will be present
in subsequent releases.

Change-Id: I298fb682945345bb4a34ec83802fd644f75bdd98
Reviewed-on: https://go-review.googlesource.com/120756Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This is so the values can not be changed and the type is easy to see.

Requested on https://go-review.googlesource.com/c/go/+/120561.

Change-Id: If2ed48ca3ba8874074687bfb2375d2f5592e8e0d
Reviewed-on: https://go-review.googlesource.com/120564Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: Icf56188fdb2b8ce6789830a35608203fdb9a3df6
Reviewed-on: https://go-review.googlesource.com/120560Reviewed-by: Paul Jolly <paul@myitcv.org.uk>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

semasleep on Darwin was refactored in https://golang.org/cl/118736 to
use the pthread_cond_timedwait function from libc. The new code
incorrectly assumed that pthread_cond_timedwait took a timeout relative
to the current time, when it in fact it takes a timeout specified in
absolute time. semasleep thus specified a timeout well in the past,
causing it to immediately exceed the timeout and spin hot. This was the
source of a large performance hit to CockroachDB (#26019).

Adjust semasleep to instead call pthread_cond_timedwait_relative_np,
which properly interprets its timeout parameter as relative to the
current time.

pthread_cond_timedwait_relative_np is non-portable, but using
pthread_cond_timedwait correctly would require two calls to
gettimeofday: one in the runtime package to convert the relative timeout
to absolute time, then another in the pthread library to convert back to
a relative offset [0], as the Darwin kernel expects a relative offset.

[0]: https://opensource.apple.com/source/libpthread/libpthread-301.30.1/src/pthread_cond.c.auto.html

Fix #26019.

Change-Id: I1a8c2429f79513b43d2b256365cd9166d235af8b
Reviewed-on: https://go-review.googlesource.com/120635Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

This change fixes a typo in doc/contribute.html (afects -> affects)
and rewords a few slightly akward sentences.

Change-Id: I6bfbacba0de29464fce134b0fdaf3898a97b8d57
Reviewed-on: https://go-review.googlesource.com/120105Reviewed-by: Rob Pike <r@golang.org>

Add a test by making misc/cgo/testshared/src/trivial.go marginally less
trivial.

Fixes #25970.

Change-Id: I8815d0c56b8850fcdbf9b45f8406f37bd21b6865
Reviewed-on: https://go-review.googlesource.com/120235
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: Ib8fa0a12363993033201ff707c315f4030811f89
Reviewed-on: https://go-review.googlesource.com/120595
Run-TryBot: Andrew Bonventre <andybons@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

We want to compress DWARF even on macOS, but the native toolchain isn't
going to understand it. Add a flag that can be used to disable
compression, then add Darwin to the whitelist used during internal
linking.

Unlike GNU ld, the Darwin linker doesn't have a handy linker flag to do
compression. But since we're already doing surgery to put the DWARF in
the output executable in the first place, compressing it at the same
time isn't unduly difficult. This does have the slightly odd effect of
compressing some Apple proprietary debug sections, which absolutely
nothing will understand. Leaving them uncompressed didn't make much
sense, though, since I doubt they're useful without (say) __debug_info.

Updates #11799

Change-Id: Ie00b0215c630a798c59d009a641e2d13f0e7ea01
Reviewed-on: https://go-review.googlesource.com/120155
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>