Map iteration previously started from a random bucket, but walked each
bucket from the beginning. Now, iteration always starts from the first
bucket and walks each bucket starting at a random offset. For
performance, the random offset is selected at the start of iteration
and reused for each bucket.

Iteration over a map with 8 or fewer elements--a single bucket--will
now be non-deterministic. There will now be only 8 different possible
map iterations.

Significant benchmark changes, on my OS X laptop (rough but consistent):

benchmark                              old ns/op     new ns/op     delta
BenchmarkMapIter                       128           121           -5.47%
BenchmarkMapIterEmpty                  4.26          4.45          +4.46%
BenchmarkNewEmptyMap                   114           111           -2.63%

Fixes #6719.

R=khr, bradfitz
CC=golang-codereviews
https://golang.org/cl/47370043

Still work to do. See http://golang.org/issue/7125

««« original CL description
net/http/cookiejar: document format of domain in PublicSuffix

Document what values a PublicSuffixList must accept as
a domain in a call to PublicSuffix.

R=bradfitz, nigeltao
CC=golang-codereviews
https://golang.org/cl/47560044

»»»

R=golang-codereviews, minux.ma
CC=golang-codereviews
https://golang.org/cl/51770044

R=golang-codereviews, iant, mjk
CC=golang-codereviews
https://golang.org/cl/52220043

R=golang-codereviews, minux.ma
CC=golang-codereviews
https://golang.org/cl/52240043

Having these flags misleads people into thinking they're acceptable
for code that "must be gofmt'd".

If an organization wishes to use gofmt internally with
different settings, they can fork gofmt trivially. But "gofmt"
as used by the community with open source Go code should not
support these old knobs.

Also removes the -comments flag.

Fixes #7101

R=r, gri
CC=golang-codereviews
https://golang.org/cl/52170043

Now with more syscall!

R=golang-codereviews, minux.ma
CC=golang-codereviews
https://golang.org/cl/52150043

Fix another issue (similar to Issue 6995) where there was a
data race when sharing a server handler's Request.Body with
another goroutine that out-lived the Handler's goroutine.

In some cases we were not closing the incoming Request.Body
(which would've required reading it until the end) if we
thought it we thought we were going to be forcibly closing the
underlying net.Conn later anyway. But that optimization
largely moved to the transfer.go *body later, and locking was
added to *body which then detected read-after-close, so now
calling the (*body).Close always is both cheap and correct.

No new test because TestTransportAndServerSharedBodyRace caught it,
albeit only sometimes. Running:

while ./http.test -test.cpu=8 -test.run=TestTransportAndServerSharedBodyRace; do true; done

... would reliably cause a race before, but not now.

Update #6995
Fixes #7092

R=golang-codereviews, khr
CC=golang-codereviews
https://golang.org/cl/51700043

For historical reasons, temp was returning a copy
of the created Node*, not the original Node*.
This meant that if analysis recorded information in the
returned node (for example, n->addrtaken = 1), the
analysis would not show up on the original Node*, the
one kept in fn->dcl and consulted during liveness
bitmap creation.

Correct this, and watch for it when setting addrtaken.

Fixes #7083.

R=khr, dave, minux.ma
CC=golang-codereviews
https://golang.org/cl/51010045

R=khr
CC=golang-codereviews
https://golang.org/cl/51820043

R=khr, dvyukov
CC=golang-codereviews
https://golang.org/cl/51830043

Void function can not return false.

R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/52000043

R=golang-codereviews, dave, bradfitz
CC=golang-codereviews
https://golang.org/cl/51000043

It's too sensitive.

Fixes bug 7095

R=golang-codereviews, iant, minux.ma, rsc
CC=golang-codereviews
https://golang.org/cl/50470043

The golden file for link.hello.darwin.amd64
was a little ahead of the checked-in code.

R=iant
TBR=iant
CC=golang-codereviews
https://golang.org/cl/51870043

R=iant
CC=golang-codereviews
https://golang.org/cl/51470043

Related changes included in this CL:

 - Add explicit start symbol to Prog.
 - Add omitRuntime bool to Prog.
 - Introduce p.Packages[""] to hold automatic symbols
 - Add SymOrder to Prog to preserve symbol order.
 - Add layout test (and fix bug that was putting everything in text section).

R=iant
CC=golang-codereviews
https://golang.org/cl/51260045

The hex dumps will diff better, and I hope they will avoid
a repeat of http://bugs.debian.org/716853.

The CL will probably show the testdata diffs as "binary",
but in fact the binary versions are being replaced by
textual hex dumps (output of hexdump -C).

R=iant
CC=golang-codereviews
https://golang.org/cl/51000044

Also fixes a dialgoogle test glitch after issue 6628 fix.

R=golang-codereviews, r
CC=golang-codereviews
https://golang.org/cl/50660044

On Plan 9, we can observe the following open file descriptors:

  0 r  c    0 (000000000000000a   0 00)     0        0 /dev/null
  1 rw |    0 (0000000001df6742   0 00) 65536       54 #|/data1
  2 rw |    0 (0000000001df6782   0 00) 65536        0 #|/data1
  3 rw M 1956 (0000000000d66dd2   0 00)  8192       12 /tmp/333163398
  4 r  c    0 (0000000000000001   0 00)     0      528 /dev/bintime
  5 r  M 1956 (0000000000d66dd1 854 00)  8192        0 /tmp/go-build843954301/os/exec/_test/exec.test
  6 r  M 1956 (0000000000d66dd1 854 00)  8192        0 /tmp/go-build843954301/os/exec/_test/exec.test
  7 r  M 1956 (0000000000d66dd1 854 00)  8192        0 /tmp/go-build843954301/os/exec/_test/exec.test
  8 r  M 1956 (0000000000d66dd1 854 00)  8192        0 /tmp/go-build843954301/os/exec/_test/exec.test
  9 r  M 1956 (0000000000d66dd1 854 00)  8192        0 /tmp/go-build843954301/os/exec/_test/exec.test
 10 r  M 1956 (0000000000d66dd1 854 00)  8192        0 /tmp/go-build843954301/os/exec/_test/exec.test
 11 r  c    0 (000000000000000f   0 00)     0       32 /dev/random
 12 r  M 1956 (0000000000d66dd1 854 00)  8192        0 /tmp/go-build843954301/os/exec/_test/exec.test
 13 r  c    0 (000000000000000a   0 00)     0        0 /dev/null
 14 rw |    0 (0000000001df6801   0 00) 65536        0 #|/data
 15 rw |    0 (0000000001df6802   0 00) 65536     1275 #|/data1

R=rsc, bradfitz, aram
CC=golang-codereviews
https://golang.org/cl/51420044

R=golang-codereviews, bradfitz, mg
CC=golang-codereviews
https://golang.org/cl/51580044

R=golang-codereviews, gnirheg.leahcim
CC=golang-codereviews
https://golang.org/cl/51670043

There were no docs explaining the meaning of Readdir's count
argument, for instance. Clarify that these mean the same as
the methods on *os.File.

R=golang-codereviews, minux.ma
CC=golang-codereviews
https://golang.org/cl/51630043

Consume as little as possible input when encountering
non-terminated rune, string, and raw string literals.
The old code consumed at least one extra character
which could lead to worse error recovery when parsing
erroneous sources.

Also made error messages in those cases more consistent.

Fixes #7091.

R=adonovan
CC=golang-codereviews
https://golang.org/cl/50630043

%x already adds the prefix unconditionally

R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/51550043

R=rsc, dave, aram, jeremyjackins, lucio.dere
CC=golang-codereviews, jas
https://golang.org/cl/50980043

Include the <sys/mman.h> header for OpenBSD mkerrors.sh. This brings
in constants used with madvise(2), mmap(2), msync(2) and mlockall(2).

Fixes #4929

R=golang-codereviews, minux.ma
CC=golang-codereviews
https://golang.org/cl/50930043

Remove the getsockname workaround for unix domain sockets on OpenBSD.
This was fixed in OpenBSD 5.2 and we now have a minimum requirement
for OpenBSD 5.4-current.

R=golang-codereviews, minux.ma
CC=golang-codereviews
https://golang.org/cl/50960043

Profiling of multithreaded applications works correctly on OpenBSD
5.4-current, so enable the profiling test.

R=golang-codereviews, minux.ma
CC=golang-codereviews
https://golang.org/cl/50940043

Fixes #6987

R=golang-codereviews, dvyukov
CC=golang-codereviews
https://golang.org/cl/49490043

     === RUN TestDialTimeout
     --- PASS: TestDialTimeout (0.21 seconds)

R=golang-codereviews, bradfitz, 0intro
CC=golang-codereviews, rsc
https://golang.org/cl/49710050

Update #7049

R=golang-codereviews, minux.ma, mikioh.mikioh
CC=golang-codereviews
https://golang.org/cl/49470052

Update Go so that it continues to work past the OpenBSD system ABI
break, with 64-bit time_t:

  http://www.openbsd.org/faq/current.html#20130813

Note: this makes OpenBSD 5.5 (currently 5.4-current) the minimum
supported release for Go.

Fixes #7049.

R=golang-codereviews, mikioh.mikioh
CC=golang-codereviews
https://golang.org/cl/13368046

R=golang-codereviews
TBR=golang-dev
CC=golang-codereviews
https://golang.org/cl/49920047

A user reported heavy contention on fmt's printer cache. Avoid
fmt.Sprint. We have to do reflection anyway, and there was
already an asString function to use strconv, so use it.

This CL also eliminates a redundant allocation + copy when
scanning into *[]byte (avoiding the intermediate string)
and avoids an extra alloc when assigning to a caller's RawBytes
(trying to reuse the caller's memory).

Fixes #7086

R=golang-codereviews, nightlyone
CC=golang-codereviews
https://golang.org/cl/50240044

Generated by addca.

R=gobot
CC=golang-codereviews
https://golang.org/cl/50500043

This seems to be the best target to benchmark sync.Pool changes.

This is resend of cl/49910043 which was LGTMed by
TBR=bradfitz

R=golang-codereviews
CC=golang-codereviews
https://golang.org/cl/50140045

R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/49160045

R=golang-codereviews, alex.brainman, bradfitz, mikioh.mikioh
CC=golang-codereviews
https://golang.org/cl/11393043

The %S and %N format verbs are used by cmd/gc to
represent Sym and Node structures, respectively.

In liblink, these two verbs are used only by the %D
format routine and never referenced externally.

This change will allow us to delete the duplicated
code for the %A, %D, %P, and %R format routines in
both the compiler and linker.

R=golang-codereviews, rsc
CC=golang-codereviews
https://golang.org/cl/49720043

Nodes of goto statements were corrupted when written
to export data.

Fixes #7023.

R=rsc, dave, minux.ma
CC=golang-codereviews
https://golang.org/cl/46190043