Fixes #2175.

R=alex.brainman, rsc, gustavo, adg
CC=golang-dev
https://golang.org/cl/4929047

This makes decimal a good test
case for the escape analysis.

With escape analysis:

benchmark                 old ns/op    new ns/op    delta
BenchmarkAtof64Decimal         1954          243  -87.56%
BenchmarkAtof64Float           2008          293  -85.41%
BenchmarkAtof64FloatExp       10106         8814  -12.78%
BenchmarkAtof64Big             5113         3486  -31.82%

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4861042

Also update $GOARM description.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4972041

R=ken2
CC=golang-dev
https://golang.org/cl/4971042

#include "go.h" (or "gg.h")

becomes

#include <u.h>
#include <libc.h>
#include "go.h"

so that go.y can #include <stdio.h>
after <u.h> but before "go.h".
This is necessary on Plan 9.

R=ken2
CC=golang-dev
https://golang.org/cl/4971041

Found with gcc 4.6 -Wunused -Wextra
but should be applicable to Plan 9 too.

R=ken2
CC=golang-dev
https://golang.org/cl/4958044

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4944043

Probably will spark some discussion.  ☺

R=lvd
CC=golang-dev
https://golang.org/cl/4948041

RFC2616 says servers should return this status code when
rejecting requests that are too large.

http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.14

R=bradfitz
CC=golang-dev
https://golang.org/cl/4962041

R=mikesamuel
CC=golang-dev
https://golang.org/cl/4956042

The following testcases now pass:

`<a href=x` tests that we do not error on partial unquoted attrs.
`<a href=x ` tests that spaces do end unquoted attrs on spaces.
`<a href=''` tests that we recognize the end of single quoted attrs.
`<a href=""` tests that we recognize the end of double quoted attrs.

R=golang-dev, nigeltao
CC=golang-dev
https://golang.org/cl/4932051

R=rsc
CC=golang-dev
https://golang.org/cl/4941047

Fixes #2182

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4952041

Fixes #2164.

R=r, rsc
CC=golang-dev
https://golang.org/cl/4927043

Scanning "0" with detected base did not actually set the nat to 0.

R=gri
CC=golang-dev
https://golang.org/cl/4923050

Merge escassign(N, x), escassign(x, N), escexpr(n), and escstmt(n) into esc(n).

1. Renaming
https://golang.org/cl/4917050/diff2/1:2001/src/cmd/gc/esc.c

2. Merging.
https://golang.org/cl/4917050/diff2/2001:4001/src/cmd/gc/esc.c

3. Simplify esccall.
https://golang.org/cl/4917050/diff2/4001:5002/src/cmd/gc/esc.c

R=lvd
CC=golang-dev
https://golang.org/cl/4917050

Based on idea in
http://patch-tracker.debian.org/patch/series/view/golang/1:59-1/008-emacs-mode-key-literal-indent.patch

Fixes #2174.

R=amdragon, ajmani, amdragon
CC=golang-dev
https://golang.org/cl/4922049

Pow10 failed for MinInt32 (endless loop until out of
memory).  Fix by returning 0 and +Inf for all arguments
where the result is not representable in a float64.
Fixes #2159.

R=rsc
CC=golang-dev
https://golang.org/cl/4930041

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4926046

R=golang-dev
CC=golang-dev, rsc
https://golang.org/cl/4941048

For now it's switch-on-and-offable with -s, and the effects can be inspected
with -m.  Defaults are the old codepaths.

R=rsc
CC=golang-dev
https://golang.org/cl/4634073

Fix for godoc on app engine.

R=dsymonds
CC=golang-dev
https://golang.org/cl/4922050

If you installed a 6g in /usr/bin it interferes
with test/run otherwise.

R=rsc
CC=golang-dev
https://golang.org/cl/4944046

My theory is that suse has larger TCP buffer sizes
by default.  I now check over 100MB, rather than over 2MB.
100MB is ~halfway between the 1MB limit and the 200MB
request that's attempted.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4926048

Fixes #2160

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4930049

exp/norm: Reduced the size of the byte buffer used by reorderBuffer by half by reusing space when combining.

R=r
CC=golang-dev
https://golang.org/cl/4939042

This allows code that wants to handle
[]byte separately to get at the actual slice
instead of just at individual bytes.
It seems to come up often enough.

R=r
CC=golang-dev
https://golang.org/cl/4942051

A side-effect is that, just like foo_386.go
is only built on 386, foo_386_test.go is only
built for testing on 386.

R=adg, r, mattn.jp
CC=golang-dev
https://golang.org/cl/4942050

It's a balance between fetching too much
and falling far enough behind that you can't
catch up.  We missed 20 commits in a row
when the builders were down for a few days.
This gives us a little more leeway.

R=adg
CC=golang-dev
https://golang.org/cl/4936047

The kludge is targeted at broken web browsers
like Chrome and IE, but it gets in the way of
sending 400 or 500-series error results with
formatted bodies in response to AJAX requests
made by pages executing in those browsers.

Now the AJAX cases will work and Chrome
and IE will be as broken with Go servers as
they are with all the other servers.

Fixes #2169.

R=bradfitz, dsymonds
CC=golang-dev
https://golang.org/cl/4930047

Some compilers care, sadly.

R=iant, ken
CC=golang-dev
https://golang.org/cl/4931042

ParseMAC parses a string representing MAC-48, EUI-48, or EUI-64 into
a HardwareAddr.

R=rsc, fshahriar
CC=golang-dev
https://golang.org/cl/4922048

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4937048

R=r, rsc
CC=golang-dev
https://golang.org/cl/4927046

CL 4938041 made some incorrect changes to the filter
function which caused a different doc/codelab/wiki/index.html
file to be generated.

Added FilterFileExports and FilterPackageExports function.
Same as the existing FileExpors/PackageExports functions
but using shared code. The old functions will be removed
in the next CL.

R=r, rsc
CC=golang-dev
https://golang.org/cl/4932048

When a line directive was encountered we would push a new 'z' entry into
the history to indicate the start of new file attributation, and a 'Z'
entry to change line numbering.  However we didn't pop the 'z' entry, so
we were actually corrupting the history stack.  The most obvious
occurance of this was in the code that build the symbol tables for the
DWARF information - where an internal stack in the linker would overflow
when more than a few line directives were encountered in a single stack
(Issue 1878).  So now we pop the 'z' entry when we encounter the end of
the file that the directive was in, which maintains the history stack
integrity.

Also, although new 'z' entries for new files had relative paths
expanded, the same was not done for line directives.  Now we do it for
line directives also - so that the now correct DWARF information has the
full path available.

Fixes #1878.

R=rsc
CC=golang-dev
https://golang.org/cl/4938042

Add -V flag to 6c command line to keep them fixed.

R=ken2
CC=golang-dev
https://golang.org/cl/4930046

Introduce extra scope for the variable declared by a
TypeSwitchGuard so that it doesn't conflict with vars
declared by the initial SimpleStmt of a type switch.

This is a replacement for CL 4896053 which caused
a build breakage.

Also:
- explicitly detect type switches (as opposed to detecting
  expression switches and then do extra testing for type switches)
- fix all outstanding TODOs in parser.go
- ran all tests

R=rsc
CC=golang-dev
https://golang.org/cl/4914044

This adds http.MaxBytesReader, similar to io.LimitReader,
but specific to http, and for preventing a class of DoS
attacks.

This also makes the 10MB ParseForm limit optional (if
not already set by a MaxBytesReader), documents it,
and also adds "PUT" as a valid verb for parsing forms
in the request body.

Improves issue 2093 (DoS protection)
Fixes #2165 (PUT form parsing)

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/4921049

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4937047