The runtime tests may be invoked from a parent that has SIGQUIT
blocked. For example, Java invokes subprocesses this way. In this
situation, TestCrashDumpsAllThreads and TestPanicSystemstack will fail
because they depend on SIGQUIT to get tracebacks, and any subprocess
test that times out will fail to kill the subprocess.

Fix this by detecting if SIGQUIT is blocked and, if so, skipping tests
that depend on it and using SIGKILL to kill timed-out subprocesses.

Based on a fix by Carl Henrik Lunde in
https://golang.org/issue/19196#issuecomment-316145733

Fixes #19196.

Change-Id: Ia20bf15b96086487d0ef6b75239dcc260c21714c
Reviewed-on: https://go-review.googlesource.com/50330
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

If we are using vfork, and if something (such as TSAN) is intercepting
the sigaction function, then we must call the system call, not the
libc function. Otherwise the intercepted sigaction call in the child
may trash the data structures in the parent.

Change-Id: Id9588bfeaa934f32c920bf829c5839be5cacf243
Reviewed-on: https://go-review.googlesource.com/50251Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Reviewed-by: Austin Clements <austin@google.com>

Fixes #21075

Change-Id: Idfe5002dfe17943844d9427e27f82ce894b92e80
Reviewed-on: https://go-review.googlesource.com/50270Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Fixes #21089

Change-Id: Idd65c7185b3e19f33958eb165cb5b09c06db3d56
Reviewed-on: https://go-review.googlesource.com/50110Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The Go ecosystem provides many tools to make Go
development more productive and seamless. Document
the availability of the editor plugins and IDEs,
add an overview of feature support and screencasts.

Updates #20398.
Updates #20402.
Updates #20399.
Updates #20401.
Updates #20569.

Change-Id: I0c6cb48eb4e3848807aaad78390493e14f097916
Reviewed-on: https://go-review.googlesource.com/45772Reviewed-by: Steve Francia <spf@golang.org>

Currently we trace mark assists even if they're satisfied entirely by
stealing. This means even if background marking is keeping up with
allocation, we'll still emit a trace event every N bytes of
allocation. The event will be a few microseconds, if that, but they're
frequent enough that, when zoomed out in the trace view, it looks like
all of the time is spent in mark assists even if almost none is.

Change this so we only emit a trace event if the assist actually has
to do assisting. This makes the traces of these events far more
useful.

Change-Id: If4aed1c413b814341ef2fba61d2f10751d00451b
Reviewed-on: https://go-review.googlesource.com/50030
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Rick Hudson <rlh@golang.org>

Load/store-merging and move optimizations can result in unaligned
memory accesses. This is fine so long as the load/store instruction
used does not take a relative offset. In the SSA rules this means we
must not merge (MOVDaddr (SB)) ops into loads/stores unless we can
guarantee the alignment of the target.

Fixes #21048.

Change-Id: I70f13a62a148d5f0a56e704e8f76e36b4a4226d9
Reviewed-on: https://go-review.googlesource.com/49250
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

Fixes #21077

Change-Id: Ic61d7313907f58ff4027fd2eee1ddb8c1656304d
Reviewed-on: https://go-review.googlesource.com/49712Reviewed-by: Dmitri Shuralyov <shurcool@gmail.com>

tSweepTerm and pauseStart are supposed to be when STW was triggered,
but right now they're captured a bit before STW. Move these down to
immediately before we trigger STW.

Fixes #19590.

Change-Id: Icd48a5c4d45c9b36187ff986e4f178b5064556c1
Reviewed-on: https://go-review.googlesource.com/49612
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Currently, Windows stacks are either 128kB or 2MB depending on whether
the binary uses cgo. This is because we assume that Go system stacks
and the small amount of C code invoked by the standard library can
operate within smaller stacks, but general Windows C code assumes
larger stacks.

However, it's easy to call into arbitrary C code using the syscall
package on Windows without ever importing cgo into a binary. Such
binaries need larger system stacks even though they don't use cgo.

Fix this on 64-bit by increasing the system stack size to 2MB always.
This only costs address space, which is free enough on 64-bit to not
worry about. We keep (for now) the existing heuristic on 32-bit, where
address space comes at more of a premium.

Updates #20975.

Change-Id: Iaaaa9a2fcbadc825cddc797aaaea8d34ef8debf2
Reviewed-on: https://go-review.googlesource.com/49331
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

Change-Id: Ie6a88b70d7c45c59995ee2f57fb28f9a3cbb404d
Reviewed-on: https://go-review.googlesource.com/49470Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Add Adam Kisala (individual CLA)
Add Aditya Mukerjee (individual CLA)
Add Akhil Indurti (individual CLA)
Add André Carvalho (individual CLA)
Add Andy Walker (individual CLA)
Add Awn Umar (individual CLA)
Add Bastian Ike (individual CLA)
Add Brian Downs (individual CLA)
Add Cody Oss (individual CLA)
Add Costin Chirvasuta (corporate CLA for Google Inc.)
Add Dan Ballard (individual CLA)
Add Dong-hee Na (individual CLA)
Add Dylan Waits (individual CLA)
Add Evan Hicks (individual CLA)
Add Fannie Zhang (corporate CLA for ARM Ltd.)
Add Francisco Rojas (individual CLA)
Add Gabriel Nicolas Avellaneda (individual CLA)
Add Gabríel Arthúr Pétursson (individual CLA)
Add Greg Poirier (individual CLA)
Add Iccha Sethi (individual CLA)
Add Ivan Moscoso (individual CLA)
Add Jamie Kerr (individual CLA)
Add Joe Kyo (individual CLA)
Add Joey Geiger (individual CLA)
Add John R. Lenton (individual CLA)
Add Johnny Luo (individual CLA)
Add Josh Roppo (individual CLA)
Add Kate Manson (individual CLA)
Add Leo Rudberg (corporate CLA for Google Inc.)
Add Ma Peiqi (individual CLA)
Add Martynas Budriūnas (corporate CLA for Google Inc.)
Add Maryan Hratson (individual CLA)
Add Michael Edwards (individual CLA)
Add Michael Hendricks (individual CLA)
Add Pablo Santiago Blum de Aguiar (individual CLA)
Add Pat Moroney (individual CLA)
Add Shi Han Ng (individual CLA)
Add Steven Buss (corporate CLA for Google Inc.)
Add Suzy Mueller (corporate CLA for Google Inc.)
Add Taro Aoki (individual CLA)
Add Tim Heckman (individual CLA)
Add Tony Walker (individual CLA)
Add Yasha Bubnov (individual CLA)

Updates #12042

Change-Id: Iee063dd6c5a39de16907acfb5af87e81a05ab417
Reviewed-on: https://go-review.googlesource.com/49351Reviewed-by: Andrew Bonventre <andybons@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Fixes #20796
Fixes #16283

Change-Id: Ib11992fbd2bc1fbb3b14ae5a6bf0da2e4c12f641
Reviewed-on: https://go-review.googlesource.com/49311Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Framepointer is the default now. Only print an X: list
if the settings are _not_ the default.

Before:

$ go tool compile -V
compile version devel +a5f30d9508 Sun Jul 16 14:43:48 2017 -0400 X:framepointer
$ go1.8 tool compile -V
compile version go1.8 X:framepointer
$

After:

$ go tool compile -V
compile version devel +a5f30d9508 Sun Jul 16 14:43:48 2017 -0400
$ go1.9 tool compile -V # imagined
compile version go1.9
$

Perpetuates #18317.

Change-Id: I981ba5c62be32e650a166fc9740703122595639b
Reviewed-on: https://go-review.googlesource.com/49252
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Missed in CL 49253 because I submitted from the Gerrit UI and
had not mailed the latest copy. Sigh.

Change-Id: I540f960278df43e2eaf1aac188eb124a1ff240dd
Reviewed-on: https://go-review.googlesource.com/49256
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

The init func was using testing.Short, but that's not available
until after flag parsing. Found by CL 49251.

Change-Id: Ia7b871043375260873fa2c7e81e1d43c1c83d33f
Reviewed-on: https://go-review.googlesource.com/49253
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Fixes #21043

Change-Id: I12db4f67ddee80500ff323f84e8fa34511650e63
Reviewed-on: https://go-review.googlesource.com/49230Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Per note at top of doc, we don't use fixed-width spaces
in fixed-width phrases like "go doc".

Also ASN.1 NULL is not code so it's not <code> at all.

Change-Id: I791e4e6030b8b8d42f4621d2f4bf32fef93cf343
Reviewed-on: https://go-review.googlesource.com/47693
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: I55f50e45f8872f063c3b6c9e89261d14689e77ce
Reviewed-on: https://go-review.googlesource.com/47692
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: Ia3e351169a4ebe6db5e5f37b668f23dc8c992c78
Reviewed-on: https://go-review.googlesource.com/48877
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I04849883dd2e1f6d083e9f57d2a8c1bd7d258953
Reviewed-on: https://go-review.googlesource.com/48878
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>

Fixes #20450

Change-Id: I2256282a8880e99508e98fefedfb94a7cccacbcf
Reviewed-on: https://go-review.googlesource.com/48969
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>

Change-Id: I062ec0606a741c8aa1b74f3f4b4e4fd47f76fed5
Reviewed-on: https://go-review.googlesource.com/48775Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: I33f0e2362e85287b493d9279d43b760733e2abcb
Reviewed-on: https://go-review.googlesource.com/48831
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>

Change-Id: Ib491d144387a7675af370f7b925fe6e62440d153
Reviewed-on: https://go-review.googlesource.com/48966
Run-TryBot: Kevin Burke <kev@inburke.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Kevin Burke <kev@inburke.com>

Change-Id: Ic47198bc8bf5baabfcf4d0599825eab30d7b126c
Reviewed-on: https://go-review.googlesource.com/48853Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

The existing example for Decoder.Decode (Stream) had excessive
indentation in the godoc interface for the const jsonStream,
making it hard to read. This fixes the indentation in the
example_test.go to improve the readability in godoc.

Helps #21026.

Change-Id: I16f56b82182da1dcc73cca44e535a7f5695e975d
Reviewed-on: https://go-review.googlesource.com/48910Reviewed-by: Dmitri Shuralyov <shurcool@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: Iec9a7bf61566ee08c4d15adb39d43c7a29c79122
Reviewed-on: https://go-review.googlesource.com/48962Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: I9c0c601ec5957475e949dcc4a8c2116724d01215
Reviewed-on: https://go-review.googlesource.com/48961Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>

It had been implemented. Refer to https://golang.org/pkg/archive/zip/#FileHeader.Comment

Change-Id: I81572562c3111b58189baa3510b9ba688fe269c9
Reviewed-on: https://go-review.googlesource.com/48857Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: I5ca5a6689f0679154c24820466f5cf0011d0aaa6
Reviewed-on: https://go-review.googlesource.com/48959Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

kicking off contributing again with a classic

Change-Id: Ifb0aed8f1dc854f85751ce0495967a3c4315128d
Reviewed-on: https://go-review.googlesource.com/49016Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: I5c32a968303848304cbd6fe1e83bed0af11f6440
Reviewed-on: https://go-review.googlesource.com/48960Reviewed-by: Caleb Spare <cespare@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Add a example for string.Compare that return the three possible results.

Change-Id: I103cf39327c1868fb249538d9e22b11865ba4b70
Reviewed-on: https://go-review.googlesource.com/49011Reviewed-by: Heschi Kreinick <heschi@google.com>

Clarifying that FindString only provides left-most match

Change-Id: Ic6ecec12cca759fd4b3565ef5901a110843ffd56
Reviewed-on: https://go-review.googlesource.com/48609Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: Ib6a59735381ce744553f1ac96eeb65a194c8da10
Reviewed-on: https://go-review.googlesource.com/48860Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: I52efa7aa72a23256e5ca56470ffeba975ed8f739
Reviewed-on: https://go-review.googlesource.com/48760Reviewed-by: Bryan Mills <bcmills@google.com>

Change-Id: I69d1359d8868d4c5b173e4d831e38cea7dfeb713
Reviewed-on: https://go-review.googlesource.com/48859Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: I259e25b9d0b069912053a250e9739e04fafca54d
Reviewed-on: https://go-review.googlesource.com/48892
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: Ibdd57489543d57a24d1e3c41210abd9fbc930b8f
Reviewed-on: https://go-review.googlesource.com/48867Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>