We used to have to keep on-stack copies of these types.
Now they can be registerized.

[0]T is kind of trivial but might as well handle it.

This change enables another change I'm working on to improve how x.(T)
expressions are handled (#17405).  This CL helps because now all
types that are direct interface types are registerizeable (e.g. [1]*byte).

No higher-degree arrays for now because non-constant indexes are hard.

Update #17405

Change-Id: I2399940965d17b3969ae66f6fe447a8cefdd6edd
Reviewed-on: https://go-review.googlesource.com/32416
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>

This is an extension of
https://go-review.googlesource.com/c/31662/
to mark all the temporaries, not just the ssa-generated ones.

Before-and-after ls -l `go tool -n compile` shows a 3%
reduction in size (or rather, a prior 3% inflation for
failing to filter temps out properly.)

Replaced name-dependent "is it a temp?" tests with calls to
*Node.IsAutoTmp(), which depends on AutoTemp.  Also replace
calls to istemp(n) with n.IsAutoTmp(), to reduce duplication
and clean up function name space.  Generated temporaries
now come with a "." prefix to avoid (apparently harmless)
clashes with legal Go variable names.

Fixes #17644.
Fixes #17240.

Change-Id: If1417f29c79a7275d7303ddf859b51472890fd43
Reviewed-on: https://go-review.googlesource.com/32255
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

Change-Id: I8a28a88a655d9929f8641f71573dc01dc53be00f
Reviewed-on: https://go-review.googlesource.com/32443Reviewed-by: Alan Donovan <adonovan@google.com>

This picks up just a trivial fix,
making vet (and thus me) happy.

Change-Id: Ib82ae44c081ff1ec5c078196a6cd5e1a3505d03b
Reviewed-on: https://go-review.googlesource.com/32427
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: Ic66eb2939d83559610e62cbb181a8faa6193ecc4
Reviewed-on: https://go-review.googlesource.com/32426
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Makes vet happy.

Change-Id: I00de44a844afa57901b31991acf9e7ac834a9572
Reviewed-on: https://go-review.googlesource.com/32425
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #17592.

Change-Id: I914fa8c0729012990878b6e5c3e99b0f9b0e2be8
Reviewed-on: https://go-review.googlesource.com/32350
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>

-M, -P, and -R were for debugging backend passes that no longer
exists.

-g is used for debugging instructions generated with Gins, but the SSA
backend mostly generates instructions directly. The handful of
instructions still generated with Gins are pretty useless for
debugging.

-x was used to debug the old lexer, but now it only causes us to print
file names as they're parsed, and only if we manually hack the
compiler to enable tracing.

Change-Id: Ia58d4bc9c1312693466171a3fcefc1221e9a2381
Reviewed-on: https://go-review.googlesource.com/32428
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Adds an assembly implementation of sha256.block for ppc64le to improve its
performance.  This implementation is largely based on the original amd64
implementation, which unrolls the 64 iterations of the inner loop.

Fixes #17652

benchmark               old ns/op     new ns/op     delta
BenchmarkHash8Bytes     1263          767           -39.27%
BenchmarkHash1K         14048         7766          -44.72%
BenchmarkHash8K         102245        55626         -45.60%

benchmark               old MB/s     new MB/s     speedup
BenchmarkHash8Bytes     6.33         10.43        1.65x
BenchmarkHash1K         72.89        131.85       1.81x
BenchmarkHash8K         80.12        147.27       1.84x

Change-Id: Ib4adf429423b20495580400be10bd7e171bcc70b
Reviewed-on: https://go-review.googlesource.com/32318Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Adds an assembly implementation of sha512.block for ppc64le to improve its
performance.  This implementation is largely based on the original amd64
implementation, unrolling the 80 iterations of the inner loop.

Fixes #17660

benchmark               old ns/op     new ns/op     delta
BenchmarkHash8Bytes     1715          1133          -33.94%
BenchmarkHash1K         10098         5513          -45.41%
BenchmarkHash8K         68004         35278         -48.12%

benchmark               old MB/s     new MB/s     speedup
BenchmarkHash8Bytes     4.66         7.06         1.52x
BenchmarkHash1K         101.40       185.72       1.83x
BenchmarkHash8K         120.46       232.21       1.93x

Change-Id: Ifd55a49a24cb159b3a09a8e928c3f37727aca103
Reviewed-on: https://go-review.googlesource.com/32320Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

These were accidentally removed by a rollback cl: golang.org/cl/32441

Change-Id: I0cfa8b3397be324dabfb8f33b6548a03c10571eb
Reviewed-on: https://go-review.googlesource.com/32334Reviewed-by: Alan Donovan <adonovan@google.com>

This reverts commit b33030a7.

Reason for revert: We're going to try to get the code in this change
submitted in smaller, more carefully reviewed changes.

Change-Id: I4175f4b297f0e69fb78b11f9dc0bd82f27865be7
Reviewed-on: https://go-review.googlesource.com/32441Reviewed-by: Russ Cox <rsc@golang.org>

Fixes #16997

Change-Id: I9ca27d8cff1905584862997d0e8a11ce3c4c21cb
Reviewed-on: https://go-review.googlesource.com/30750Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Also add a link to more information about isolation levels as defined by the
SQL standard. Fixes #17682.

Change-Id: I94c53b713f4c882af40cf15fe5f1e5dbc53ea741
Reviewed-on: https://go-review.googlesource.com/32418Reviewed-by: Daniel Theophanes <kardianos@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: If6eb3a7c9ad48a517e584567b1003479c1df6cca
Reviewed-on: https://go-review.googlesource.com/32136Reviewed-by: Daniel Theophanes <kardianos@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Fixes #17686.

Change-Id: I7d07c367e50b448579f9855bea43df76ddb82bd0
Reviewed-on: https://go-review.googlesource.com/32420Reviewed-by: Rob Pike <r@golang.org>

Does not handle imports of packages with exported aliases yet.

For #17592.

Change-Id: Iee63fb9d521014995003a417271fbe0384ae04ef
Reviewed-on: https://go-review.googlesource.com/32108Reviewed-by: Alan Donovan <adonovan@google.com>

The map[typeOff]*_type object is created at run time and stored in
the moduledata. The moduledata object is marked by the linker as
SNOPTRDATA, so the reference is ignored by the GC. Running
misc/cgo/testplugin/test.bash with GOGC=1 will eventually collect
the typemap and crash.

This bug probably comes up in -linkshared binaries in Go 1.7.
I don't know why we haven't seen a report about this yet.

Fixes #17680

Change-Id: I0e9b5c006010e8edd51d9471651620ba665248d3
Reviewed-on: https://go-review.googlesource.com/32430
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Plumb the import path of a plugin package through to the linker, and
use it as the prefix on the exported symbol names.

Before this we used the basename of the plugin file as the prefix,
which could conflict and result in multiple loaded plugins sharing
symbols that are distinct.

Fixes #17155
Fixes #17579

Change-Id: I7ce966ca82d04e8507c0bcb8ea4ad946809b1ef5
Reviewed-on: https://go-review.googlesource.com/32355Reviewed-by: Ian Lance Taylor <iant@golang.org>

Previously, we were off by one.

Also fix a comment typo.

Change-Id: Ib94d23acc56d5fccd44144f71655481f98803ac8
Reviewed-on: https://go-review.googlesource.com/32149Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

This is convenient for direct use of `go tool cgo`. We can also use it
from the go tool to reduce the length of the file names that cgo
generates.

Update #17070.

Change-Id: I8466a0a2cc68a732d17d07319e303497715bac8c
Reviewed-on: https://go-review.googlesource.com/32354
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

Disabled by https://golang.org/cl/53020044 due to false positives.
Reenable and model properly.

Fixes #17306.

Change-Id: I28405ddfcd17f58cf1427c300273212729154359
Reviewed-on: https://go-review.googlesource.com/31589
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>

This field is a zero length array and has little use. Since Go 1.5, trailing
zero-length arrays take up space. Both syscall.UnixRights() and
syscall.ParseSocketControlMessage() depend on being able to do an unsafe cast
of socket control message data to Cmsghdr this is only safe if the socket
control message data is greater than or equal to the size of Cmsghdr. Since
control message data that is equal in size to Cmsghdr without X__cmsg_data is
a valid socket control message, we must remove X__cmsg_data or not perform the
unsafe cast.

Removing X__cmsg_data will prevent Go code that uses X__cmsg_data from
compiling, but removing the unsafe cast will cause Go code that uses
X__cmsg_data to fail or exhibit undefined behavior at runtime. It was
therefore decided that removing X__cmsg_data was the better option.

Fixes #17649

Change-Id: I39f323f978eca09d62da5785c5c5c9c7cbdf8c31
Reviewed-on: https://go-review.googlesource.com/32319Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Prior to this change, it was implied that transaction properties
would be carried in the context value. However, no such properties
were defined, not even common ones. Define two common properties:
isolation level and read-only. Drivers may choose to support
additional transaction properties. It is not expected any
further transaction properties will be added in the future.

Change-Id: I2f680115a14a1333c65ba6f943d9a1149d412918
Reviewed-on: https://go-review.googlesource.com/31258
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This updates the runtime to HEAD to keep it aligned and fixes some bugs.

http://llvm.org/viewvc/llvm-project?view=revision&revision=285454
fixes the crash on darwin related to unaligned data section (#17065).

http://llvm.org/viewvc/llvm-project?view=revision&revision=285451
enables core dumps by default (#16527).

http://llvm.org/viewvc/llvm-project?view=revision&revision=285455
adds a hook to obtain number of races reported so far (#15972).
Can now be obtained with:

//go:nosplit
func RaceReportCount() int {
	var n uint64
	racecall(&__tsan_report_count, uintptr(unsafe.Pointer(&n)), 0, 0, 0)
	return int(n)
}

Fixes #16527.
Fixes #17065.
Update #15972.

Change-Id: I8f869cb6275c9521a47303f3810a9965e9314357
Reviewed-on: https://go-review.googlesource.com/32160
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

No point in computing this info on startup.
Compute it at build time.
This lets us spend more time computing & checking the size classes.

Improve the div magic for rounding to the start of an object.
We can now use 32-bit multiplies & shifts, which should help
32-bit platforms.

The static data is <1KB.

The actual size classes are not changed by this CL.

Change-Id: I6450cec7d1b2b4ad31fd3f945f504ed2ec6570e7
Reviewed-on: https://go-review.googlesource.com/32219
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>

This fixes systems for which ccache is the default compiler.

Also remove a couple of temporary files created by TestImportMain.

Fixes #17668.

Change-Id: I1edefdcec5f417be0533c146253c35ff4928c1c0
Reviewed-on: https://go-review.googlesource.com/32328Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Provides redirection support for 307, 308 server statuses.
Provides redirection support for DELETE method.

Updates old tests that assumed all redirects were treated
the way 301, 302 and 303 are processed.

Fixes #9348
Fixes #10767
Fixes #13994

Change-Id: Iffa8dbe0ff28a1afa8da59869290ec805b1dd2c4
Reviewed-on: https://go-review.googlesource.com/29852
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: Iec469846dc8b5a747ad81690000f1f6f53721ea1
Reviewed-on: https://go-review.googlesource.com/32372Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The GZIP format records the ModTime as an uint32 counting seconds since
the Unix epoch. The zero value is explicitly defined in section 2.3.1
as meaning no timestamp is available.

Currently, the Writer always encodes the ModTime even if it is the zero
time.Time value, which causes the Writer to try and encode the value
-62135596800 into the uint32 MTIME field. This causes an overflow and
results in our GZIP files having MTIME fields indicating a date in 2042-07-13.

We alter the Writer to only encode ModTime if the value does not underflow
the MTIME field (i.e., it is newer than the Unix epoch). We do not attempt
to fix what happens when the timestamp overflows in the year 2106.

We alter the Reader to only decode ModTime if the value is non-zero.
There is no risk of overflowing time.Time when decoding.

Fixes #17663

Change-Id: Ie1b65770c6342cd7b14aeebe10e5a49e6c9eb730
Reviewed-on: https://go-review.googlesource.com/32325Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Updates http2 to x/net git rev 76c1a11e for:

     http2: initialize Server.IdleTimeout from http.Server as http1 does
     https://golang.org/cl/32230

     http2: change how Server.IdleTimeout is initialized from http.Server
     https://golang.org/cl/32323

Fixes #14204

Change-Id: I099f89fcd0d8bc0e42da163ae0a3b786fd81292f
Reviewed-on: https://go-review.googlesource.com/32322
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Because git.

Change-Id: Ia1e7c6ba0e8c4d47f993487d2483cbb213b465e5
Reviewed-on: https://go-review.googlesource.com/32351
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

After the final slash, dots are %-escaped when constructing a symbol name,
so that in the actual symbol table, the import path githost.com/my.git
becomes githost.com/my%2egit. In this case, -X githost.com/my.git.Value=foo
needs to set githost.com/my%2egit.Value. This is a detail of the object format
and not something users should know or depend on, so apply the escaping
as needed.

People who have run across this already and figured out and started using
the escaped forms with -X will find those forms not working anymore.
That is, -X githost.com/my%2egit.Value=foo is the Go 1.7 workaround but
will stop working in Go 1.8 once this proper fix is in place.
People who need to keep scripts working with older and newer versions of Go
can safely pass both forms, and one will be ignored:

    -X githost.com/my%2egit.Value=foo -X githost.com/my.git.Value=foo

Fixes #16710.

Change-Id: I0e994ccdd412a4eb8349fefce9aeb3bfc9a83cd8
Reviewed-on: https://go-review.googlesource.com/31970
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Also fix behavior of Buffers.WriteTo when writev returns an error.

Fixes #16266.

Change-Id: Idc9503408ce2cb460663768fab86035cbab11aef
Reviewed-on: https://go-review.googlesource.com/31584
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Writes gzip-format uncompressed files.

Change-Id: Id5dc01852e21732978700fd9efcc2d4a5899ffeb
Reviewed-on: https://go-review.googlesource.com/32260
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Reviewed-by: Michael Matloob <matloob@golang.org>

The filepath.Abs function in windows did not call Clean as the
documentation claimed.  This change not only fixes that behavior but
also adjusts TestAbs to verify Abs calls Clean as documented.

Fixes #17210

Change-Id: I20c5f5026042fd7bd9d929ff5b17c8b2653f8afe
Reviewed-on: https://go-review.googlesource.com/32292Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: I017c2ef7cc6248d3f4e38a791cd2576e941984ed
Reviewed-on: https://go-review.googlesource.com/32156
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Improves the error message by moving the field name before the body
of a struct, in the error message for unknown fields for structs.

* Exhibit:
Given program:

package main

import "time"

func main() {
  _ = struct {
    about      string
    before     map[string]uint
    update     map[string]int
    updateTime time.Time
    expect     map[string]int
  }{
    about:   "this one",
    updates: map[string]int{"gopher": 10},
  }
}

* Before:
./issue17631.go:20: unknown struct { about string; before map[string]uint;
 update map[string]int; updateTime time.Time; expect map[string]int } field
'updates' in struct literal

* After:
./issue17631.go:20: unknown field 'updates' in struct literal of type { about string;
before map[string]uint; update map[string]int; updateTime time.Time;
expect map[string]int }

Fixes #17631

Change-Id: I76842616411b931b5ad7a76bd42860dfde7739f4
Reviewed-on: https://go-review.googlesource.com/32240Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

I did 'export GORACE=atexit_sleep_ms=0' in a console
and then was puzzled as to why race tests fail.
Existing GORACE env var may (or may not) override
the one that we setup.
Filter out GORACE as we do for other important env vars.

Change-Id: I29be86b0cbb9b5dc7f9efb15729ade86fc79b0e0
Reviewed-on: https://go-review.googlesource.com/32163Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: Iec35f9b62982da40de400397bc456149216303dc
Reviewed-on: https://go-review.googlesource.com/32297Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>