Having a trailing dot in the string doesn't really simplify
the checking loop in isDomainName. Avoid this unnecessary allocation.
Also make the valid domain names more explicit by adding some more
test cases.

benchmark            old ns/op    new ns/op    delta
BenchmarkDNSNames       2420.0        983.0  -59.38%

benchmark           old allocs   new allocs    delta
BenchmarkDNSNames           12            0  -100.00%

benchmark            old bytes    new bytes    delta
BenchmarkDNSNames          336            0  -100.00%

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12662043

Renders code coverage as an overlay, replicating the look of the
HTML that go tool cover produces.

Also some cleanups.

R=adonovan, bradfitz
CC=golang-dev
https://golang.org/cl/12684043

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/12603045

MOVBS and MOVHS are defined as duplicates of MOVB and MOVH,
and perform sign-extension moving.
No change is made to code generation.

Update #1837

R=rsc, bradfitz
CC=golang-dev
https://golang.org/cl/12682043

- adjusted test files so that they actually type-check
- adjusted go1.txt, go1.1.txt, next.txt
- to run, provide build tag: api_tool

Fixes #4538.

R=bradfitz
CC=golang-dev
https://golang.org/cl/12300043

The ResponseWriter's ReadFrom method was causing side effects on
the output before any data was read.

Now, bail out early and do a normal copy (which does a read
before writing) when our input and output are known to not to
be the pair of types we need for sendfile.

Fixes #5660

R=golang-dev, rsc, nightlyone
CC=golang-dev
https://golang.org/cl/12632043

I moved the pointer block from one end of the frame
to the other toward the end of working on the last CL,
and of course that made the optimization no longer work.

Now it works again:

0030 (bug361.go:12) DATA    gclocals·0+0(SB)/4,$4
0030 (bug361.go:12) DATA    gclocals·0+4(SB)/4,$3
0030 (bug361.go:12) GLOBL   gclocals·0+0(SB),8,$8

Fixes arm build (this time for sure!).

TBR=golang-dev
CC=cshapiro, golang-dev, iant
https://golang.org/cl/12627044

Sort non-pointer-containing data to the low end of the
stack frame, and make the bitmaps only cover the
pointer-containing top end.

Generates significantly less garbage collection bitmap
for programs with large byte buffers on the stack.

Only 2% shorter for godoc, but 99.99998% shorter
in some test cases.

Fixes arm build.

TBR=golang-dev
CC=cshapiro, golang-dev, iant
https://golang.org/cl/12541047

We weren't seeing additions. (stuff to put in next.txt)

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/12678043

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/12519046

R=gri
CC=golang-dev
https://golang.org/cl/12639043

The receiver name is optional. when Method's receiver name messing,
the functionList regex can't match the Method,
e.g. `func (*T) ProtoMessage() {}`.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12530044

Fixes #5900.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12669043

Individual variables bigger than 10 MB are now
moved to the heap, as if they had escaped on
their own.

This avoids ridiculous stacks for programs that
do things like
        x := [1<<30]byte{}
        ... use x ...

If 10 MB is too small, we can raise the limit.

Fixes #6077.

R=ken2
CC=golang-dev
https://golang.org/cl/12650045

Readdir's result should never contain a nil.

Fixes #5960.

R=golang-dev, rsc, bradfitz
CC=golang-dev
https://golang.org/cl/12261043

Fixes #5334.

R=golang-dev, dave, rsc
CC=golang-dev
https://golang.org/cl/8653047

R=golang-dev
CC=golang-dev
https://golang.org/cl/12634044

Generated by addca.

R=gobot
CC=golang-dev
https://golang.org/cl/12671043

Fixes #4938.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12657044

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12585044

GetQueuedCompletionStatusEx allows to dequeue a batch of completion
notifications, which is more efficient than dequeueing one by one.

benchmark                           old ns/op    new ns/op    delta
BenchmarkClientServerParallel4         100605        90945   -9.60%
BenchmarkClientServerParallel4-2        90225        74504  -17.42%

R=golang-dev, alex.brainman
CC=golang-dev
https://golang.org/cl/12436044

This allows to skip GetQueuedCompletionStatus if an IO operation completes synchronously.
benchmark                    old ns/op    new ns/op    delta
BenchmarkTCP4Persistent          27669        25863   -6.53%
BenchmarkTCP4Persistent-2        18173        15908  -12.46%
BenchmarkTCP4Persistent-4        10390         9766   -6.01%

R=golang-dev, mikioh.mikioh, alex.brainman
CC=golang-dev
https://golang.org/cl/12409044

Fixes #5896.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12645043

Fixes #6058.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12643043

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/12642043

s/commandLine/CommandLine/g

Fixes #4209.

R=golang-dev, dsymonds, bradfitz
CC=golang-dev
https://golang.org/cl/12587043

Fixes bug 6055.

R=golang-dev, bradfitz, dvyukov, khr
CC=golang-dev
https://golang.org/cl/12536045

In prep for Robert's forthcoming cmd/api rewrite which
depends on the go.tools subrepo, we'll need to be more
careful about how and when we run cmd/api.

Rather than implement this policy in both run.bash and
run.bat, this change moves the policy and mechanism into
cmd/api/run.go, which will then evolve.

The plan is in a TODO in run.go.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/12482044

Fixes #6061.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12609043

The test takes up to 64 seconds on windows builders.
I've tried to reduce number of iterations in the test,
but it does not affect run time.
Fixes #6054.

R=golang-dev, alex.brainman
CC=golang-dev
https://golang.org/cl/12531043

Previously, all word aligned locations in the local variables
area were scanned as conservative roots.  With this change, a
bitmap is generated describing the locations of pointer values
in local variables.

With this change the argument bitmap information has been
changed to only store information about arguments.  The locals
member, has been removed.  In its place, the bitmap data for
local variables is now used to store the size of locals.  If
the size is negative, the magnitude indicates the size of the
local variables area.

R=rsc
CC=golang-dev
https://golang.org/cl/12328044

Remove NOPROF/DUPOK from everything.

Edits done with a script, except pclinetest.asm which depended
on the DUPOK flag on main().

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12613044

There were some issues with the code sometimes using base64.StdEncoding,
and sometimes base64.URLEncoding.
Encoding basic authentication is now always done by the same code.

Fixes #5970.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12397043

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12620043

The gc compiler only gives an error about an unused label if
it has not given any errors in an earlier pass.  Remove all
unused labels in this test because they don't test anything
useful and they cause gccgo to give unexpected errors.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12580044

The gc compiler only gives an error about fallthrough in a
type switch if it has not given any errors in an earlier pass.
Remove all functions in this test that use fallthrough in a
type switch because they don't test anything useful and they
cause gccgo to give unexpected errors.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12614043

We can then include this file in assembly to replace
cryptic constants like "7" with meaningful constants
like "(NOPROF|DUPOK|NOSPLIT)".

Converting just pkg/runtime/asm*.s for now.  Dropping NOPROF
and DUPOK from lots of places where they aren't needed.
More .s files to come in a subsequent changelist.

A nonzero number in the textflag field now means
"has not been converted yet".

R=golang-dev, daniel.morsing, rsc, khr
CC=golang-dev
https://golang.org/cl/12568043

Fixes #6063

R=golang-dev, r, dave
CC=dvyukov, golang-dev
https://golang.org/cl/12586043

HTTP/1.0 connections are closed implicitly, unless otherwise specified.

Note that this change does not test or fix "request too large" responses.
Reasoning: (a) it complicates tests and fixes, (b) they should be rare,
and (c) this is just a minor wire optimization, and thus not really worth worrying
about in this context.

Fixes #5955.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12435043

A response to a HEAD request is supposed to look the same as a
response to a GET request, just without a body.

HEAD requests are incredibly rare in the wild.

The Go net/http package has so far treated HEAD requests
specially: a Write on our default ResponseWriter returned
ErrBodyNotAllowed, telling handlers that something was wrong.
This was to optimize the fast path for HEAD requests, but:

1) because HEAD requests are incredibly rare, they're not
   worth having a fast path for.

2) Letting the http.Handler handle but do nop Writes is still
   very fast.

3) this forces ugly error handling into the application.
   e.g. https://code.google.com/p/go/source/detail?r=6f596be7a31e
   and related.

4) The net/http package nowadays does Content-Type sniffing,
   but you don't get that for HEAD.

5) The net/http package nowadays does Content-Length counting
   for small (few KB) responses, but not for HEAD.

6) ErrBodyNotAllowed was useless. By the time you received it,
   you had probably already done all your heavy computation
   and I/O to calculate what to write.

So, this change makes HEAD requests like GET requests.

We now count content-length and sniff content-type for HEAD
requests. If you Write, it doesn't return an error.

If you want a fast-path in your code for HEAD, you have to do
it early and set all the response headers yourself. Just like
before. If you choose not to Write in HEAD requests, be sure
to set Content-Length if you know it. We won't write
"Content-Length: 0" because you might've just chosen to not
write (or you don't know your Content-Length in advance).

Fixes #5454

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/12583043