If an op generates a tuple, and part of that tuple is of flags type,
then treat the op as clobbering flags.

Normally this doesn't matter because we do:

v1 = ADDS        <int32, flags>
v2 = Select0 v1  <int32>
v3 = Select1 v1  <flags>

And v3 will do the right clobbering of flags.  But in the rare
cases where we issue a tuple-with-flag op and the flag portion
is dead, then we never issue a Select1.  But v1 still clobbers flags,
so we need to respect that.

Fixes builder failure in CL 28950.

Change-Id: I589089fd81aaeaaa9750bb8d85e7b10199aaa002
Reviewed-on: https://go-review.googlesource.com/29083Reviewed-by: Cherry Zhang <cherryyz@google.com>

Truncate and Round operate on absolute time, which means that
Truncate(Hour) may return a time with non-zero Minute(). Document that
more clearly, and remove the misleading example which suggests it is
safe.

Updates #16647

Change-Id: I930584ca030dd12849195d45e49ed2fb74e0c9ac
Reviewed-on: https://go-review.googlesource.com/28730Reviewed-by: Ian Lance Taylor <iant@golang.org>

This used to be used to give special semantics to the builtin
definitions of package runtime and unsafe, but none of those are
relevant anymore:

- The builtin runtime and unsafe packages do not risk triggering false
  import cycles since they no longer contain `import "runtime"`.

- bimport.go never creates ODCLTYPE, so no need to special case them.

- "incannedimport != 0" is only true when "importpkg != nil" anyway,
  so "incannedimport == 0 && importpkg == nil" is equivalent to just
  "importpkg == nil".

Change-Id: I076f15dd705d4962e7a4c33972e304ef67e7effb
Reviewed-on: https://go-review.googlesource.com/29084
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Updates #17068

Change-Id: I61b75ec07ca8705a678677d262e11b16848cddf3
Reviewed-on: https://go-review.googlesource.com/29079
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>

We already explicitly construct the "unsafe.Pointer" type in typeinit
because we need it for Types[TUNSAFEPTR]. No point in also having it
in builtin/unsafe.go if it just means (*importer).importtype needs to
fix it.

Change-Id: Ife8a5a73cbbe2bfcabe8b25ee4f7e0f5fd0570b4
Reviewed-on: https://go-review.googlesource.com/29082
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: I7bfb0e5e71fc26448b0d5d3801cd6e50c8b48f5d
Reviewed-on: https://go-review.googlesource.com/29078Reviewed-by: Robert Griesemer <gri@golang.org>

No code changes.

Change-Id: I7a22b3fbd6d727b276c7559f064cb0fdf385c02b
Reviewed-on: https://go-review.googlesource.com/28955Reviewed-by: Matthew Dempsky <mdempsky@google.com>

- also consistently use %v instead of %s when we have a (gc) Formatter
- rewrite done automatically using Formats test in -u (update) mode
- manual update of format strings that were not single string constants
- updated fmt.go, fmt_test.go accordingly
- fmt_test: permit "%T" always

Change-Id: I8f0704286aba5704600ad0c4a4484005b79b905d
Reviewed-on: https://go-review.googlesource.com/28954Reviewed-by: Matthew Dempsky <mdempsky@google.com>

- only accept a-z, A-Z as format verbs
- blacklist vendored math package (no need to include it)

Change-Id: Ica0fcbfe712369f79dd1d3472dfd4759b8bc3752
Reviewed-on: https://go-review.googlesource.com/28953Reviewed-by: Matthew Dempsky <mdempsky@google.com>

- process all directories recursively

Change-Id: I27a737013d17fd3c2cc8ae9de4722dcbe989e6e5
Reviewed-on: https://go-review.googlesource.com/28789Reviewed-by: Matthew Dempsky <mdempsky@google.com>

Atomic ops on ARM are implemented with kernel calls, so they are
not intrinsified.

Change-Id: I0e7cc2e5526ae1a3d24b4b89be1bd13db071f8ef
Reviewed-on: https://go-review.googlesource.com/28977
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>

The download page says "OS X 10.8 or later", but other pages said 10.7.
Say 10.8 everywhere.

Turns out Go doesn't even compile on OS X 10.7 (details in bug) and we
only run builders for OS X 10.8+, which is likely why 10.7
regressed. Until recently we only had OS X 10.10 builders, even.

We could run 10.7 builders, but there's basically no reason to do so,
especially with 10.12 coming out imminently.

Fixes #16625

Change-Id: Ida6e20fb6c54aea0a3757235b708ac1c053b8c04
Reviewed-on: https://go-review.googlesource.com/28870Reviewed-by: Chris Broadfoot <cbro@golang.org>

Fixes #16732

Change-Id: If0a7f9425cf75b9e31b3091c43cb23d6e039f568
Reviewed-on: https://go-review.googlesource.com/28782
TryBot-Result: Gobot Gobot <gobot@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

There's more work to do.

Updates #17068

Change-Id: I4e16c0e8e9ac739e1fe266224c3769f6c5b2e070
Reviewed-on: https://go-review.googlesource.com/29076Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

The new SSA backend for s390x can use R0 as a general purpose register.
This change modifies assembly code to either avoid using R0 entirely
or explicitly set R0 to 0.

R0 can still be safely used as 0 in address calculations.

Change-Id: I3efa723e9ef322a91a408bd8c31768d7858526c8
Reviewed-on: https://go-review.googlesource.com/28976Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This commit adds the following instructions to support the new SSA
backend for s390x:

32-bit operations:
ADDW
SUBW
NEGW
FNEGS

Conditional moves:
MOVDEQ
MOVDGE
MOVDGT
MOVDLE
MOVDLT
MOVDNE

Unordered branches (for floating point comparisons):
BLEU
BLTU

Modulo operations:
MODW
MODWU
MODD
MODDU

The modulo operations might be removed in a future commit because
I'd like to change DIV to produce a tuple once the old backend is
removed.

This commit also removes uses of REGZERO from the assembler. They
aren't necessary and R0 will be used as a GPR by SSA.

Change-Id: I05756c1cbb74bf4a35fc492f8f0cd34b50763dc9
Reviewed-on: https://go-review.googlesource.com/29075
Run-TryBot: Michael Munday <munday@ca.ibm.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

When possible, emit static data rather than
init functions for interface values.

This:

* cuts 32k off cmd/go
* removes several error values from runtime init
* cuts the size of the image/color/palette compiled package from 103k to 34k
* reduces the time to build the package in #15520 from 8s to 1.5s

Fixes #6289
Fixes #15528

Change-Id: I317112da17aadb180c958ea328ab380f83e640b4
Reviewed-on: https://go-review.googlesource.com/26668
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

The CL 28951 added TestLookupPort_Minimal, which was failing
on Plan 9, because lookupPort was not case-insensitive.

Change-Id: Ic80dd29dad4ffd1c84c2590e3d5d0e588ab2e6c2
Reviewed-on: https://go-review.googlesource.com/29051
TryBot-Result: Gobot Gobot <gobot@golang.org>
Run-TryBot: David du Colombier <0intro@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This list now matches the one in popt.go.

Change-Id: Ib24de531cc35252f0ef276e5c6d247654b021533
Reviewed-on: https://go-review.googlesource.com/28965
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

It's not intuitive, especially in the presence of subtests, so improve the
explanation and extend and explain the examples.

Change-Id: I6c4d3f8944b60b12311d0c0f0a8e952e7c35a9ed
Reviewed-on: https://go-review.googlesource.com/28995Reviewed-by: Andrew Gerrand <adg@golang.org>

Remove the naked returns and goto statements from parse.

Make tests more consistent in the got/want ordering, and clean up some
unnecessary helper functions.

Change-Id: Iaa244cb8c00dd6b42836d95448bf02caa72bfabd
Reviewed-on: https://go-review.googlesource.com/28890Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I70beb844cd6928dbfbfd8de365e0cb708e54f71e
Reviewed-on: https://go-review.googlesource.com/28496
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Adam Langley <agl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>

Since 2a8c81ff handshake messages are not written directly to wire but
buffered.  If an error happens at the wrong time the alert will be
written to the buffer but never flushed, causing an EOF on the client
instead of a more descriptive alert.

Thanks to Brendan McMillion for reporting this.

Fixes #17037

Change-Id: Ie093648aa3f754f4bc61c2e98c79962005dd6aa2
Reviewed-on: https://go-review.googlesource.com/28818Reviewed-by: Adam Langley <agl@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Adam Langley <agl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Changes generated with eg:

func before(n *gc.Node) bool { return n.Type.Recv() != nil }
func after(n *gc.Node) bool  { return n.IsMethod() }

func before(n *gc.Node) bool { return n.Type.Recv() == nil }
func after(n *gc.Node) bool  { return !n.IsMethod() }

Change-Id: I28e544490d17bbdc06ab11ed32464af5802ab206
Reviewed-on: https://go-review.googlesource.com/28968
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: I88dd0811db3a9864106def47b89848f5c8de94d4
Reviewed-on: https://go-review.googlesource.com/28545
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Part of adding PIE internal linking on linux/amd64.

Change-Id: I57f0596cb254cbe6569e4d4e39fe4f48437733f2
Reviewed-on: https://go-review.googlesource.com/28544Reviewed-by: Ian Lance Taylor <iant@golang.org>

Part of adding PIE internal linking on linux/amd64.

Change-Id: I5ce01d1974e5d4b1a8cbcc8b08157477631d8d24
Reviewed-on: https://go-review.googlesource.com/28543
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Part of adding PIE internal linking on linux/amd64.

Change-Id: I586e7c2afba349281168df5e20d2fdcb697f6e37
Reviewed-on: https://go-review.googlesource.com/28542Reviewed-by: Ian Lance Taylor <iant@golang.org>

Details: http://www.airs.com/blog/archives/189

Part of adding PIE internal linking on linux/amd64.

Change-Id: I8843a97f22f6f120346cccd694c7fff32f09f60b
Reviewed-on: https://go-review.googlesource.com/28541Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

When cmd/compile generates position-independent code on linux
(the -shared flag), it refers to runtime.tlsg as a TLS IE variable.

When cmd/link is linking a PIE executable internally, all TLS IE
relocations are generated by cmd/compile, and the variable they
refer to, runtime.tlsg, is local to the binary. This means we can
optimize this particular IE case to LE, and thus implement IE
support when internally linking.

To do this optimization in the linker, we need to rewrite the
PC-relative MOVD to a constant load. This may seem like an
unconscionable act born of enthusiasm, but it turns out this is
standard operating procedure for linkers. GNU gold does exactly
the same optimization. I spent some time reading it and documented
at least one missing feature from this version.

Part of adding PIE internal linking on linux/amd64.

Change-Id: I1eb068d0ec774724944c6b308aa5084582ecde0b
Reviewed-on: https://go-review.googlesource.com/28540Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Fixes #17038.

Change-Id: Iaf6294361050040830af1d60cd48f263223d9356
Reviewed-on: https://go-review.googlesource.com/28966
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Updates #17065

Change-Id: I113caced6de666a9b032ab2684ece79482aa7357
Reviewed-on: https://go-review.googlesource.com/28964
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

This reuses the machinery built for dynamic loading of shared
libraries. The significant difference with PIE is we generate
dynamic relocations for known internal symbols, not just
dynamic external symbols.

Part of adding PIE internal linking on linux/amd64.

Change-Id: I4afa24070bfb61f94f8d3648f2433d5343bac3fe
Reviewed-on: https://go-review.googlesource.com/28539Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

When internally linking with using rel.ro sections, this segment covers
the sections. To do this, move to other read-only sections, SELFROSECT
and SMACHOPLT, out of the way.

Part of adding PIE internal linking on linux/amd64.

Change-Id: I4fb3d180e92f7e801789ab89864010faf5a2cb6d
Reviewed-on: https://go-review.googlesource.com/28538
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Adds golang.org/x/net/idna to the Go repo from the
golang.org/x/net repo's git rev 7db922ba (Dec 2012).

Punycode is needed for http.Get("привет.рф") etc., which will
come in separate commits.

Updates #13835

Change-Id: I313ed82d292737579a3ec5dcf8a9e766f2f75138
Reviewed-on: https://go-review.googlesource.com/28961
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Also, flesh out the baked-in /etc/services table for LookupPort a bit.

This services map moves from a unix-specific file to a portable file
where nacl can use it.

Also, remove the duplicated entries in the protocol map in different
cases, and just canonicalize the input before looking in the map. Now
it handles any case, including MiXeD cAse.

In the process, add a test that service names for LookupPort are case
insensitive. They were on Windows, but not cgo. Now there's a test and
they're case insensitive in all 3+ paths. Maybe it breaks plan9. We'll
see.

Fixes #17045

Change-Id: Idce7d68703f371727c7505cda03a32bd842298cd
Reviewed-on: https://go-review.googlesource.com/28951
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>

Fixes #15486.

Change-Id: Id879dc9acef9232003df9a0f6f54312191374a60
Reviewed-on: https://go-review.googlesource.com/27530
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

CL 28484 mistakenly assumed that WSARecv returns WSAEINPROGRESS
when there is nothing to read. But the error is ERROR_IO_PENDING.
Fix that mistake.

I was about to write a test for it. But I have found
TestTCPReadWriteAllocs in net package that does nearly what I need,
but was conveniently disabled. So enable and extend the test.

Fixes #16988

Change-Id: I55e5cf8998a9cf29e92b398d702280bdf7d6fc85
Reviewed-on: https://go-review.googlesource.com/28990
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This is a temporary measure to work around #17057.
It will be reverted when #17057 is fixed.

Change-Id: I21c02f63f3530774c91065cfed5d9c566839ed9f
Reviewed-on: https://go-review.googlesource.com/28959Reviewed-by: Rob Pike <r@golang.org>

This was written for CL 27811,
but it got lost in the sea of new files.

Change-Id: I5c52cb23dda499b21a6bb32ed5c586779ccbc2f1
Reviewed-on: https://go-review.googlesource.com/28960Reviewed-by: Rob Pike <r@golang.org>