Part 3 of several.

* Linux has grown a SetsockoptByte.
* SetsockoptIPMreqn is handled directly by syscall_linux.go and syscall_freebsd.go.

R=golang-dev, mikioh.mikioh, r, bradfitz
CC=golang-dev
https://golang.org/cl/10775043

Generated by addca.

R=gobot
CC=golang-dev
https://golang.org/cl/10868046

The lzw.NewReader doc comment says, "It is the caller's responsibility
to call Close on the ReadCloser when finished reading."

Thanks to Andrew Bonventre for noticing this.

R=r, dsymonds, adg
CC=andybons, golang-dev
https://golang.org/cl/10821043

R=dsymonds
CC=golang-dev
https://golang.org/cl/10933044

Instead, leave the error testing to the type checker, eventually.

Fixes #5827.

R=adonovan
CC=golang-dev
https://golang.org/cl/10917043

ReadMIMEHeader is used by net/http, net/mail, and
mime/multipart.

Don't do so many small allocations. Calculate up front
how much we'll probably need.

benchmark                  old ns/op    new ns/op    delta
BenchmarkReadMIMEHeader         8433         7467  -11.45%

benchmark                 old allocs   new allocs    delta
BenchmarkReadMIMEHeader           23           14  -39.13%

benchmark                  old bytes    new bytes    delta
BenchmarkReadMIMEHeader         1705         1343  -21.23%

R=golang-dev, r, iant, adg
CC=golang-dev
https://golang.org/cl/8179043

Generated by addca.

R=gobot
CC=golang-dev
https://golang.org/cl/10840044

origin/master is always a remote branch, and it doesn't make sense to
switch to a remote branch. master is the default branch that tracks it.

R=adg
CC=golang-dev, matt.jibson
https://golang.org/cl/10869046

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/10761048

Fixes #5760.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/10871043

This does not include AES-GCM yet. Also, it assumes that the handshake and
certificate signature hash are always SHA-256, which is true of the ciphersuites
that we currently support.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/10762044

R=gri, r
CC=golang-dev
https://golang.org/cl/10679047

using m->tls[0] to save ucontext pointer is not re-entry safe, and
the old code didn't set it before the early return when signal is
received on non-Go threads.

so misc/cgo/test used to hang when testing issue 5337.

R=golang-dev, bradfitz, rsc
CC=golang-dev
https://golang.org/cl/10076045

Escape analysis needs the right curfn value on a dclfunc node, otherwise it will not analyze the function.
When generating method value wrappers, we forgot to set the curfn correctly.

Fixes #5753.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/10383048

A struct with a single field was considered as equivalent to the
field type, which is incorrect is the field is blank.

Fields with padding could make the compiler think some
types are comparable when they are not.

Fixes #5698.

R=rsc, golang-dev, daniel.morsing, bradfitz, gri, r
CC=golang-dev
https://golang.org/cl/10271046

R=golang-dev, dsymonds, dominik.honnef
CC=golang-dev
https://golang.org/cl/9293043

TBR=golang-dev
CC=golang-dev
https://golang.org/cl/10856043

When deleting a timer, a panic due to nil deref
would leave a lock held, possibly leading to a deadlock
in a defer. Instead return false on a nil timer.

Fixes #5745.

R=golang-dev, daniel.morsing, dvyukov, rsc, iant
CC=golang-dev
https://golang.org/cl/10373047

R=golang-dev, dave, rsc
CC=golang-dev
https://golang.org/cl/10458045

This CL provides stable in-place sorting by use of
bottom up merge sort with in-place merging done by
the SymMerge algorithm from P.-S. Kim and A. Kutzner.

The additional space needed for stable sorting (in the form of
stack space) is logarithmic in the inputs size n.
Number of calls to Less and Swap grow like O(n * log n) and
O(n * log n * log n):
Stable sorting random data uses significantly more calls
to Swap than the unstable quicksort implementation (5 times more
on n=100, 10 times more on n=1e4 and 23 times more on n=1e8).
The number of calls to Less is practically the same for Sort and
Stable.

Stable sorting 1 million random integers takes 5 times longer
than using Sort.

BenchmarkSortString1K      50000       328662 ns/op
BenchmarkStableString1K    50000       380231 ns/op  1.15 slower
BenchmarkSortInt1K         50000       157336 ns/op
BenchmarkStableInt1K       50000       191167 ns/op  1.22 slower
BenchmarkSortInt64K         1000     14466297 ns/op
BenchmarkStableInt64K        500     16190266 ns/op  1.12 slower

BenchmarkSort1e2          200000        64923 ns/op
BenchmarkStable1e2         50000       167128 ns/op  2.57 slower
BenchmarkSort1e4            1000     14540613 ns/op
BenchmarkStable1e4           100     58117289 ns/op  4.00 slower
BenchmarkSort1e6               5   2429631508 ns/op
BenchmarkStable1e6             1  12077036952 ns/op  4.97 slower

R=golang-dev, bradfitz, iant, 0xjnml, rsc
CC=golang-dev
https://golang.org/cl/9612044

Design doc at golang.org/s/go12slice.

R=golang-dev, r, nightlyone
CC=golang-dev
https://golang.org/cl/10761045

Design doc at golang.org/s/go12slice.
This is an experimental feature and may not be included in the release.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/10743046

This fixes an issue where linking directly to an example makes it not
runnable and visible only in a tiny window. To see the bug in action,
visit this link: http://golang.org/pkg/strings/#example_Map

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/10679050

TBR=golang-dev
CC=golang-dev
https://golang.org/cl/10849043

There are various problems, and both Dmitriy and I
will be away for the next week. Make the runtime a bit
more stable while we're gone.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/10848043

fn can clearly hold a closure in memory.
argp/pc point into stack and so can hold
in memory a block that was previously
a large stack serment.

R=golang-dev, dave, rsc
CC=golang-dev
https://golang.org/cl/10784043

Depending on net/http means depending on cgo.
When the tree is in a shaky state it's nice to see sync/atomic
pass even if cgo or net causes broken binaries.

R=golang-dev, dave, r
CC=golang-dev
https://golang.org/cl/10753044

This change adds a basic compiler plugin for Go. The plugin
integrates "go build" with Vim's ":make" command and the
quickfix list.

Fixes #5751.

R=golang-dev, dsymonds, niklas.schnelle, 0xjnml
CC=golang-dev
https://golang.org/cl/10466043

After loading a frame of a GIF, check that each pixel
is inside the frame's palette.

Fixes #5401.

R=nigeltao, r
CC=golang-dev
https://golang.org/cl/10597043

A casualty of https://golang.org/cl/10195044.

If x is an 32-bit int and u is a 64-bit ulong,
        u = (uint)x // converts to uint before extension, so zero fills
        u = (ulong)x // sign-extends

TBR=iant, r
CC=golang-dev
https://golang.org/cl/10814043

Exported inlined functions that perform a string conversion
using a non-exported named type may miss it in export data.

Fixes #5755.

R=rsc, golang-dev, ality, r
CC=golang-dev
https://golang.org/cl/10464043

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/10741043

On amd64 the frames are very close to the limit for a
nosplit (textflag 7) function, in part because the C compiler
does not make any attempt to reclaim space allocated for
completely registerized variables. Avoid a few short-lived
variables to reclaim two words.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/10758043

Fixes #5794

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/10747044

If authentication failed, the initial error was being thrown away.

Fixes #5700.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/10744043

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/10760043

Keeping the string "compactframe" because that's what
I always search for to find this code. But point to the real place too.

TBR=iant
CC=golang-dev
https://golang.org/cl/10676047

Currently it replaces GOGCTRACE env var (GODEBUG=gctrace=1).
The plan is to extend it with other type of debug tracing,
e.g. GODEBUG=gctrace=1,schedtrace=100.

R=rsc
CC=bradfitz, daniel.morsing, gobot, golang-dev
https://golang.org/cl/10026045

The last patch for preemptive scheduler,
with this change stoptheworld issues preemption
requests every 100us.
Update #543.

R=golang-dev, daniel.morsing, rsc
CC=golang-dev
https://golang.org/cl/10264044

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/10730045