Instead of erroring on actions inside comments, use existing escaping
pipeline to quash the output of actions inside comments.

If a template maintainer uses a comment to disable template code:

  {{if .}}Hello, {{.}}!{{end}}

->

  <!--{{if true}}Hello, {{.}}!{{end}}-->

will result in

  <!--Hello, !-->

regardless of the value of {{.}}.

In a later CL, comment elision will result in the entire commented-out
section being dropped from the template output.

Any side-effects in pipelines, such as panics, will still be realized.

R=nigeltao
CC=golang-dev
https://golang.org/cl/5078041

Non semantics-changing refactoring in preparation for comment elision.

R=nigeltao
CC=golang-dev
https://golang.org/cl/5071043

Fixes #2275.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5082041

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5030057

fixes #2221

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4952052

MFENCE was introduced only on the Pentium4 (SSE2),
while XADD was introduced on the 486.
Fixes #2268.

R=golang-dev, rsc
CC=fshahriar, golang-dev
https://golang.org/cl/5056045

Minorly improves runtime by about 2-3%

R=gri, jeff
CC=golang-dev
https://golang.org/cl/5052045

Fixes #2272

R=rsc
CC=golang-dev
https://golang.org/cl/5043051

R=r
CC=golang-dev
https://golang.org/cl/5056049

The algtype-based test broke when algtype
got a bit more fine-grained, so replace with
an explicit check for the invalid key types.

R=ken2
CC=golang-dev
https://golang.org/cl/5071041

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5070041

cgo: cgo to use GOARCH from the environment, not runtime.GOARCH (otherwise it results in necessity of having 8cgo and 6cgo)

R=rsc, adg
CC=golang-dev
https://golang.org/cl/4978061

Fixes #2256.

R=ken2
CC=golang-dev
https://golang.org/cl/5044047

        This line was triggering a null dereference warning
        under clang-3.0. The line was added in a46819aa9150
        but compared to it's sibling in 6l it appears to be
        leftover debugging.

R=rsc
CC=golang-dev
https://golang.org/cl/5049042

R=dsymonds, r
CC=golang-dev
https://golang.org/cl/5050049

Previously /etc/hosts would be ignored altogether, this change returns matching results
from that file without talking to a DNS server.

R=rsc
CC=golang-dev
https://golang.org/cl/5061042

R=rsc
CC=golang-dev
https://golang.org/cl/5046041

R=agl
CC=golang-dev
https://golang.org/cl/5030054

A port of Provos and Mazières's adapative hashing algorithm. See http://www.usenix.org/events/usenix99/provos/provos_html/node1.html

R=bradfitz, agl, rsc, dchest
CC=golang-dev
https://golang.org/cl/4964078

Mostly useful for the coming crypto/bcrypt package

R=bradfitz, agl, rsc, agl
CC=golang-dev
https://golang.org/cl/5013043

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5059046

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5030045

R=dsymonds
CC=golang-dev
https://golang.org/cl/5045045

This addresses several use cases:

(1) <h{{.HeaderLevel}}> used to build hierarchical documents.
(2) <input on{{.EventType}}=...> used in widgets.
(3) <div {{" dir=ltr"}}> used to embed bidi-hints.

It also makes sure that we treat the two templates below the same:

<img src={{if .Avatar}}"{{.Avatar}}"{{else}}"anonymous.png"{{end}}>
<img src="{{if .Avatar}}{{.Avatar}}{{else}}anonymous.png{{end}}">

This splits up tTag into a number of sub-states and adds testcases.

R=nigeltao
CC=golang-dev
https://golang.org/cl/5043042

The template

  <{{.}}

would violate the structure preservation property if allowed and not
normalized, because when {{.}} emitted "", the "<" would be part of
a text node, but if {{.}} emitted "a", the "<" would not be part of
a text node.

This change rewrites '<' in text nodes and RCDATA text nodes to
'&lt;' allowing template authors to write the common, and arguably more
readable:

    Your price: {{.P1}} < list price {{.P2}}

while preserving the structure preservation property.

It also lays the groundwork for comment elision, rewriting

    Foo <!-- comment with secret project details --> Bar

to

    Foo  Bar

R=nigeltao
CC=golang-dev
https://golang.org/cl/5043043

HTML5 uses "Valid URL potentially surrounded by spaces" for
attrs: http://www.w3.org/TR/html5/index.html#attributes-1

    <a href=" {{.}}">

should be escaped to filter out "javascript:..." as data.

R=nigeltao
CC=golang-dev
https://golang.org/cl/5027045

The typical UNIX method for controlling long running process is to
send the process signals. Since this doesn't get you very far, various
ad-hoc, remote-control protocols have been used over time by programs
like Apache and BIND.

Implementing an SSH server means that Go code will have a standard,
secure way to do this in the future.

R=bradfitz, borman, dave, gustavo, dsymonds, r, adg, rsc, rogpeppe, lvd, kevlar, raul.san
CC=golang-dev
https://golang.org/cl/4962064

Documentation more along the lines of os.FileInfo
Fixes #2180.

R=golang-dev, dsymonds
CC=golang-dev, mike.rosset
https://golang.org/cl/4958055

gotest src/pkg/exp/template/html was crashing because the exception handler overflowed the goroutine stack.

R=alex.brainman, golang-dev
CC=golang-dev
https://golang.org/cl/5031049

R=alex.brainman
CC=golang-dev
https://golang.org/cl/5047045

Credit to jp for proof of concept.

R=alex.brainman, jp, rsc, dvyukov
CC=golang-dev
https://golang.org/cl/4960057

filepath.Glob is documented to return nil if no files match
and an error only if the pattern is invalid.  This change
fixes it to work as documented and adds a regression test.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5040045

R=golang-dev, dsymonds
CC=golang-dev, mshields
https://golang.org/cl/5042045

bug330.go:11:6: error: expected numeric type
bug330.go:12:6: error: expected numeric type

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5031050

R=r
CC=golang-dev
https://golang.org/cl/5039045

clean up duplicate environment for CGI.
overriding former by latter.
On windows, When there are duplicated environments like following,

SCRIPT_FILENAME=c:/progra~1/php/php-cgi.exe
SCRIPT_FILENAME=/foo.php

CreateProcess use first entry.

If make cgi.Handle like following,

        cgih = cgi.Handler{
                Path: "c:/strawberry/perl/bin/perl.exe",
                Dir:  "c:/path/to/webroot",
                Root: "c:/path/to/webroot",
                Args: []string{"foo.php"},
                Env:  []string{"SCRIPT_FILENAME=foo.php"},
        }

http/cgi should behave "SCRIPT_FILENAME is foo.php".
But currently, http/cgi is set duplicate environment entries.
So, browser show binary dump of "php-cgi.exe" that is specified indented
SCRIPT_FILENAME in first entry.
This change clean up duplicates, and use latters.

R=golang-dev, bradfitz, bradfitz
CC=golang-dev
https://golang.org/cl/5010044

is going to support returning multiple matches for a single repeated group.

R=r, rsc, mpvl
CC=golang-dev
https://golang.org/cl/5014045

Trie now uses sparse block when this makes sense.

R=r, r
CC=golang-dev
https://golang.org/cl/5010043

I found a simple test case that does require doing the fixed point TODO
in computeOutCtx.

I found a way though to do this and simplify away the escapeRange
hackiness that was added in https://golang.org/cl/5012044/

R=nigeltao
CC=golang-dev
https://golang.org/cl/5015052

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5004052