Fixes #17302

Change-Id: I375d5d4f2714ff415542f4fe56a548e53c5e8ba6
Reviewed-on: https://go-review.googlesource.com/30134Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Swapper returns a func that swaps two elements in a slice.

Updates #16721

Change-Id: I7f2287a675c10a05019e02b7d62fb870af31216f
Reviewed-on: https://go-review.googlesource.com/30088
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
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Reviewed-by: Russ Cox <rsc@golang.org>

Code movement only, to look more like the equivalent http2 code, and
to make an upcoming fix look more obvious.

Updates #16002 (to be fixed once this code is in)

Change-Id: Iaa4f965be14e98f9996e7c4624afe6e19bed1a80
Reviewed-on: https://go-review.googlesource.com/30087
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>

readRecord was not returning early if c.in.decrypt failed and ran
through the rest of the function. It does set c.in.err, so the various
checks in the callers do ultimately notice before acting on the result,
but we should avoid running the rest of the function at all.

Also rename 'err' to 'alertValue' since it isn't actually an error.

Change-Id: I6660924716a85af704bd3fe81521b34766238695
Reviewed-on: https://go-review.googlesource.com/24709
Run-TryBot: Adam Langley <agl@golang.org>
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Reviewed-by: Adam Langley <agl@golang.org>

CL 20909 gave Mpint methods nice go-like names, but it
didn't update the names in the error strings. Fix them.

Same for a couple of Mpflt methods.

Change-Id: I9c99653d4b922e32fd5ba18aba768a589a4c7869
Reviewed-on: https://go-review.googlesource.com/30091Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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This commit makes the process of load/store merging more incremental
for both big and little endian operations. It also adds support for
32-bit shifts (needed to merge 16- and 32-bit loads/stores).

In addition, the merging of little endian stores is now supported.
Little endian stores are now up to 30 times faster.

Change-Id: Iefdd81eda4a65b335f23c3ff222146540083ad9c
Reviewed-on: https://go-review.googlesource.com/29956
Run-TryBot: Michael Munday <munday@ca.ibm.com>
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Reviewed-by: Keith Randall <khr@golang.org>

Convconst is not used in the new backend, and all its callers
were deleted in CL 29168 (cmd/compile: delete lots of the legacy
backend). iconv was an helper function for Convconst.

Updates #16357

Change-Id: I65c7345586d7af81cdc2fb09c68f744ffb161a17
Reviewed-on: https://go-review.googlesource.com/30090Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Updates bundled http2 to x/net git rev a333c53 for:

   http2: add Transport support for IdleConnTimeout
   https://golang.org/cl/30075

And add tests.

The bundled http2 also includes a change adding a Ping method to
http2.ClientConn, but that type isn't exposed in the standard
library. Nevertheless, the code gets compiled and adds a dependency on
"crypto/rand", requiring an update to go/build's dependency
test. Because net/http already depends on crypto/tls, which uses
crypto/rand, it's not really a new dependency.

Fixes #16808

Change-Id: I1ec8666ea74762f27c70a6f30a366a6647f923f7
Reviewed-on: https://go-review.googlesource.com/30078
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>

The endcgo function call is currently deferred in case a cgo
callback into Go panics and unwinds through cgocall. Typical cgo
calls do not have callbacks into Go, and even fewer panic, so we
pay the cost of this defer for no typical benefit.

Amazingly, there is another defer on the cgocallback path also used
to cleanup in case the Go code called by cgo panics. This CL folds
the first defer into the second, to reduce the cost of typical cgo
calls.

This reduces the overhead for a no-op cgo call significantly:

	name       old time/op  new time/op  delta
	CgoNoop-8  93.5ns ± 0%  51.1ns ± 1%  -45.34%  (p=0.016 n=4+5)

The total effect between Go 1.7 and 1.8 is even greater, as CL 29656
reduced the cost of defer recently. Hopefully a future Go release
will drop the cost of defer to nothing, making this optimization
unnecessary. But until then, this is nice.

Change-Id: Id1a5648f687a87001d95bec6842e4054bd20ee4f
Reviewed-on: https://go-review.googlesource.com/30080
Run-TryBot: David Crawshaw <crawshaw@golang.org>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>

Consistently access function parameters using the FP pseudo-register
instead of SP (e.g., x+0(FP) instead of x+4(SP) or x+8(SP), depending
on register size). Two reasons: 1) doc/asm says the SP pseudo-register
should use negative offsets in the range [-framesize, 0), and 2)
cmd/vet only validates parameter offsets when indexed from the FP
pseudo-register.

No binary changes to the compiled object files for any of the affected
package/OS/arch combinations.

Change-Id: I0efc6079bc7519fcea588c114ec6a39b245d68b0
Reviewed-on: https://go-review.googlesource.com/30085Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

At this point in the compiler we haven't assigned Xoffset values for
PAUTO variables anyway, so just immediately store the stack offsets
into Xoffset rather than into a global map.

Change-Id: I61eb471c857c8b145fd0895cbd98fd4e8d3c3365
Reviewed-on: https://go-review.googlesource.com/30081
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Keith Randall <khr@golang.org>

There are only three Prog types that we were creating with an OLITERAL
Node: ATEXT, ATYPE, and AFUNCDATA. ATEXT's value we later overwrite in
defframe, and ATYPE's we don't even need. AFUNCDATA only needs integer
constants, so get rid of all the non-int constant logic and skip
creating a Node representation for the constant.

While here, there are a few other Naddr code paths that are no longer
needed, so turn those into Fatalfs.

Passes toolstash/buildall.

Change-Id: I4cc9b92c3011890afd4f31ebeba8b1b42b753cab
Reviewed-on: https://go-review.googlesource.com/30074
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

I decided not to expand the API for this per discusion on #16220.

Fixes #16220

Change-Id: I65cb2eacd4ec28c79438a8f7c30024524a484ce6
Reviewed-on: https://go-review.googlesource.com/30082Reviewed-by: Daniel Theophanes <kardianos@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Naddr used to translate PFUNC Nodes into references to the function
literal wrapper, and then Afunclit could be used to rewrite it to
reference the function text itself. But now everywhere we use Naddr on
PFUNC Nodes, we immediately call Afunclit anyway. So just merge
Afunclit's behavior into Naddr.

Passes toolstash/buildall.

Change-Id: If2ca6d7f314c1a0711df9b8209aace16ba4b8bc0
Reviewed-on: https://go-review.googlesource.com/30073
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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To prevent leaking connections, close any open Rows when the
context is cancelled. Also enforce context cancel while reading
rows off of the wire.

Change-Id: I62237ecdb7d250d6734f6ce3d2b0bcb16dc6fda7
Reviewed-on: https://go-review.googlesource.com/29957Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #17288.

Change-Id: I2ddd01d14667d5c6a2e19bd70489da8d9869d308
Reviewed-on: https://go-review.googlesource.com/30072
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Fix an old TODO and use atomic.Value for holding the Transport's
alternate protocol map. It is very frequently accessed and almost
never set or updated.

Change-Id: Ic5a71c504bdac76678114c6390d1fc0673e07aa9
Reviewed-on: https://go-review.googlesource.com/29967
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
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Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

No fast path currently for solaris, windows, nacl, plan9.

Fixes #13451

Change-Id: I24b3233a2e3a57fc6445e276a5c0d7b097884007
Reviewed-on: https://go-review.googlesource.com/29951Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Currently any script tag is treated as a javascript container, although
<script type="text/template"> must not be. Check "type" attribute of
"script" tag. If it is present and it is not a JS MIME type, do not
transition to elementScript state.

Fixes #12149, where // inside text template was treated as regexp.
Fixes #6701

Change-Id: I8fc9e504f7280bdd800f40383c061853665ac8a2
Reviewed-on: https://go-review.googlesource.com/14336
Run-TryBot: Russ Cox <rsc@golang.org>
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Reviewed-by: Russ Cox <rsc@golang.org>

All other architectures merge stack-zeroing ranges if there are at
most two pointers/registers of memory between them, but x86 is
erroneously coded to require *exactly* two.

Shaves a tiny amount of text size off cmd/go when building for
GOARCH=386 and eliminates an unnecessary inconsistency between x86's
defframe and the other GOARCHes'.

   text	   data	    bss	    dec	    hex	filename
5241015	 191051	  93336	5525402	 544f9a	go.before
5240224	 191051	  93336	5524611	 544c83	go.after

Change-Id: Ib15ec8c07bca11e824640f0ab32abfc4bb160496
Reviewed-on: https://go-review.googlesource.com/30050
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Introduced in CL 9263 (prepare to unexport gc.Mp*) and CL 9267
(prepare Node.Val to be unexported), their only callers were in
the old backend and all got deleted in CL 29168 (cmd/compile:
delete lots of the legacy backend).

Update #16357

Change-Id: I0a5d76b98b418e8ec0984c033c3bc0ac3fc5f38a
Reviewed-on: https://go-review.googlesource.com/29997Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Move all parse/format related functionality into strconv.go
and thoroughly test them. This also reduces the amount of noise
inside reader.go and writer.go.

There was zero functionality change other than moving code around.

Change-Id: I3bc288d10c20ebb3814b30b75d8acd7be62b85d7
Reviewed-on: https://go-review.googlesource.com/28470
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
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Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

RFC 6265, section 4.2.2 says:
<<<
Although cookies are serialized linearly in the Cookie header,
servers SHOULD NOT rely upon the serialization order.  In particular,
if the Cookie header contains two cookies with the same name (e.g.,
that were set with different Path or Domain attributes), servers
SHOULD NOT rely upon the order in which these cookies appear in the
header.
>>>

This statement seems to indicate that cookies should conceptually
be thought of as a map of keys to sets of values (map[key][]value).
However, in practice, everyone pretty much treats cookies as a
map[key]value and the API for Request.Cookie seems to indicate that.

We should update the documentation for Request.Cookie to warn the
user what happens when there is are multiple cookies with the same
key. I deliberately did not want to say *which* cookie is returned.

Change-Id: Id3e0e24b2b14ca2d9ea8b13f82ba739edaa71cf0
Reviewed-on: https://go-review.googlesource.com/29364Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: I573278c9aee80e62463b2542774dabeec7c3b098
Reviewed-on: https://go-review.googlesource.com/29969
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

In https://golang.org/cl/28951 I cleaned up the lookupProtocol and
lookupPort paths to be consistently case-insensitive across operating
systems and to share the same baked-in maps of port & proto values
that can be relied on to exist on any platform.

I missed the fallback to the baked-in maps on Windows, though, which
broke Windows XP. This should fix it.

Fixes #17175

Change-Id: Iecd434fb684304137ee27f5521cfaa8c351a1bde
Reviewed-on: https://go-review.googlesource.com/29968
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>

IntLiteral was only called by the gins functions in
cmd/compile/internal/{arm64,mips64,ppc64}/gsubr.go
but CL 29220 (cmd/compile: remove gins) deleted them,
so IntLiteral is now unused.

Change-Id: I2652b6d2ace6fdadc1982f65e749f3982513371e
Reviewed-on: https://go-review.googlesource.com/29996Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
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Fixes #17276

Change-Id: I0188cf9bc5fdb48c71ad929cc54206d03e0b96e4
Reviewed-on: https://go-review.googlesource.com/29995Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
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This makes function fit in 16 bytes, saving 16 bytes.

Change-Id: Iac5d2add42f6dae985b2a5cbe19ad4bd4bcc92ec
Reviewed-on: https://go-review.googlesource.com/29151
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
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Reviewed-by: Keith Randall <khr@golang.org>

When offset < 0 and -offset fits in instruction, generate SUB
instruction, instead of ADD with constant from the pool.

Fixes #13280.

Change-Id: I57d97fe9300fe1f6554365e2262393ef50acbdd3
Reviewed-on: https://go-review.googlesource.com/30014
Run-TryBot: Cherry Zhang <cherryyz@google.com>
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Reviewed-by: David Chase <drchase@google.com>

Remove duplicate vars, commented out code  and duplicate lines.
When choosing between 2 aliases, on with more uses was chosen.

Change-Id: I7bc15f1693de3f6d378cef9c09469970a659db40
Reviewed-on: https://go-review.googlesource.com/29152
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Reviewed-by: Keith Randall <khr@golang.org>

Fixes #17270.

Change-Id: I4affa57e10baf1a758bc0977265d160f220b2945
Reviewed-on: https://go-review.googlesource.com/29960
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Also add compiler debug ouput and add a test.

Fixes #15390.

Change-Id: Iceba1414c29bcc213b87837387bf8ded1f3157f1
Reviewed-on: https://go-review.googlesource.com/30011
Run-TryBot: Cherry Zhang <cherryyz@google.com>
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This change adds support for decoding and encoding the bool type. The
encoding is a single byte, with a zero value for false and a non-zero
value for true.

Closes #16856.

Change-Id: I1d1114b320263691473bb100cad0f380e0204186
Reviewed-on: https://go-review.googlesource.com/28514Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: I6d413f747e6a6c30c5e0e9afdffd5ec18dce7e08
Reviewed-on: https://go-review.googlesource.com/29974Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This change reverts CL 18814 which is a workaroud for older DragonFly
BSD kernels, and fixes #13945 and #13947 in a more general way the
same as other platforms except NetBSD.

This is a followup to CL 29491.

Updates #16329.

Change-Id: I771670bc672c827f2b3dbc7fd7417c49897cb991
Reviewed-on: https://go-review.googlesource.com/29971
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Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change setsig, setsigstack, getsig, raise, raiseproc to take uint32 for
signal number parameter, as that is the type mostly used for signal
numbers.  Same for dieFromSignal, sigInstallGoHandler, raisebadsignal.

Remove setsig restart parameter, as it is always either true or
irrelevant.

Don't check the handler in setsigstack, as the only caller does that
anyhow.

Don't bother to convert the handler from sigtramp to sighandler in
getsig, as it will never be called when the handler is sigtramp or
sighandler.

Don't check the return value from rt_sigaction in the GNU/Linux version
of setsigstack; no other setsigstack checks it, and it never fails.

Change-Id: I6bbd677e048a77eddf974dd3d017bc3c560fbd48
Reviewed-on: https://go-review.googlesource.com/29953
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #17231

Change-Id: I0d6007ab504f2277cb6affc9e2050157a6ad4d5e
Reviewed-on: https://go-review.googlesource.com/29970Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
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This change replaces the use of CryptGenRandom with RtlGenRandom in
Windows to generate cryptographically random numbers during process
startup. RtlGenRandom uses the same RNG as CryptGenRandom, but it has many
fewer DLL dependencies and so does not affect process startup time as
much.

This makes running simple Go program on my computers faster.

Windows XP:
benchmark                      old ns/op     new ns/op     delta
BenchmarkRunningGoProgram-2     47408573      10784148      -77.25%

Windows 7 (VM):
benchmark                    old ns/op     new ns/op     delta
BenchmarkRunningGoProgram     16260390      12792150      -21.33%

Windows 7:
benchmark                      old ns/op     new ns/op     delta
BenchmarkRunningGoProgram-2     13600778      10050574      -26.10%

Fixes #15589

Change-Id: I2816239a2056e3d4a6dcd86a6fa2bb619c6008fe
Reviewed-on: https://go-review.googlesource.com/29700Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Mark nil check operations as faulting if their arg is zero.
This lets the late nilcheck pass remove duplicates.

Fixes #17242.

Change-Id: I4c9938d8a5a1e43edd85b4a66f0b34004860bcd9
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Run-TryBot: Keith Randall <khr@golang.org>
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Reviewed-by: Cherry Zhang <cherryyz@google.com>

Also add GP<->FP move addressing mode to FMOVS, FMOVD
instructions.

Ceil-8                 37.1ns ± 0%   7.9ns ± 0%  -78.64%          (p=0.000 n=4+5)
Dim-8                  20.9ns ± 1%  11.3ns ± 0%  -45.93%          (p=0.008 n=5+5)
Floor-8                22.9ns ± 0%   7.9ns ± 0%  -65.41%          (p=0.029 n=4+4)
Gamma-8                 117ns ± 0%    94ns ± 1%  -19.50%          (p=0.016 n=4+5)
PowInt-8                121ns ± 0%   108ns ± 1%  -11.07%          (p=0.008 n=5+5)
PowFrac-8               331ns ± 0%   318ns ± 0%   -3.93%          (p=0.000 n=5+4)
Trunc-8                18.8ns ± 0%   7.9ns ± 0%  -57.83%          (p=0.016 n=4+5)

Change-Id: I709b7f1a914b28adc27414522db551e2630cfb92
Reviewed-on: https://go-review.googlesource.com/29734
Run-TryBot: Cherry Zhang <cherryyz@google.com>
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Reviewed-by: David Chase <drchase@google.com>