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39562 Commits

Author SHA1 Message Date
Josh Bleecher Snyder
ee1c76dccd runtime: simplify constant strings in asm
As of CL 163747, we can write arbitrary length strings
in assembly DATA instructions.

Make use of it here to improve readability.

Change-Id: I556279ca893f527874e3b26112c43573834ccd9c
Reviewed-on: https://go-review.googlesource.com/c/go/+/167386
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2019-03-14 00:12:28 +00:00
Russ Cox
7c04110c52 fmt: put back named results in ss.scanBasePrefix
CL 165619 removed these names when it removed
the use of the plain 'return'. But the names help for
documentation purposes even without being mentioned
directly in the function, so removing them makes the
code less readable. Put them back. I renamed found
to zeroFound to make the meaning clearer.

Change-Id: I1010931f08290af0b0ede7d21b1404c2eea196a0
Reviewed-on: https://go-review.googlesource.com/c/go/+/165899
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2019-03-14 00:08:15 +00:00
Josh Bleecher Snyder
66f5d4e035 cmd/compile: int64(uint64 >> x) >= 0 if x > 0
This rewrite rule triggers only once, in math/big.quotToFloat64,
as part of converting a uint64 to a float64.

Nevertheless, it is cheap; let's add it.

Change-Id: I3ed4a197a559110fec1bc04b3a8abb4c7fcc2c89
Reviewed-on: https://go-review.googlesource.com/c/go/+/167500
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2019-03-14 00:03:38 +00:00
Josh Bleecher Snyder
61945fc502 cmd/compile: don't generate panicshift for masked int shifts
We know that a & 31 is non-negative for all a, signed or not.
We can avoid checking that and needing to write out an
unreachable call to panicshift.

Change-Id: I32f32fb2c950d2b2b35ac5c0e99b7b2dbd47f917
Reviewed-on: https://go-review.googlesource.com/c/go/+/167499
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
2019-03-14 00:03:29 +00:00
Matthew Dempsky
2d21bf4252 cmd/compile: cleanup OREAL/OIMAG constant folding
Based on suggestion from gri@ on golang.org/cl/166980.

Passes toolstash-check.

Change-Id: I79b66bb09b5635f3a9daecaa5d605b661a0ab108
Reviewed-on: https://go-review.googlesource.com/c/go/+/167501
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2019-03-13 23:31:04 +00:00
Josh Bleecher Snyder
870cfe6484 test/codegen: gofmt
Change-Id: I33f5b5051e5f75aa264ec656926223c5a3c09c1b
Reviewed-on: https://go-review.googlesource.com/c/go/+/167498
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Matt Layher <mdlayher@gmail.com>
2019-03-13 21:44:45 +00:00
Bryan C. Mills
2989abc91e cmd/dist: add a test in misc/reboot to verify that the toolchain can self-bootstrap
Fixes #30758

Change-Id: I8e49958602de9caa47bb5710828158e51744f375
Reviewed-on: https://go-review.googlesource.com/c/go/+/167478
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2019-03-13 21:16:24 +00:00
Daniel Martí
1a24bf10bc builtin: make len's godoc less ambiguous
The len godoc uses a blockquote to list the rules for its semantics.

The item that describes channels is a bit long, so it's split in two
lines. However, the first line ends with a semicolon, and the second
line can be read as a sentence of its own, so it's easy to misinterpret
that the two lines are separate.

Making that easy mistake would lead to an incorrect understanding of
len:

	if v is nil, len(v) is zero.

This could lead us to think that len(nil) is valid and should return
zero. When in fact, that statement only applies to nil channels.

To make this less ambiguous, add a bit of indentation to the follow-up
line, to align with the channel body. If lists are added to godoc in the
future via #7873, perhaps this text can be simplified.

Fixes #30349.

Change-Id: I84226edc812d429493137bcc65c332e92d4e6c87
Reviewed-on: https://go-review.googlesource.com/c/go/+/167403
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2019-03-13 20:57:32 +00:00
Brad Fitzpatrick
6aa710f723 cmd/go/internal/work: remove commented-out import
Somebody wasn't using goimports. :)

Change-Id: Ibad3c0781ea70d538592b2e90d8b578e4fae8173
Reviewed-on: https://go-review.googlesource.com/c/go/+/167385
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2019-03-13 20:52:57 +00:00
Hana Kim
bf94fc3ae3 cmd/go: fix the default build output name for versioned binaries
`go build` has chosen the last element of the package import path
as the default output name when -o option is given. That caused
the output of a package build when the module root is the major
version component such as 'v2'.

A similar issue involving `go install` was fixed in
https://golang.org/cl/128900. This CL refactors the logic added
with the change and makes it available as
internal/load.DefaultExecName.

This CL makes 'go test' to choose the right default test binary
name when the tested package is in the module root. (E.g.,
instead of v2.test, choose pkg.test for the test of 'path/pkg/v2')

Fixes #27283.

Change-Id: I6905754f0906db46e3ce069552715f45356913ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/140863
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2019-03-13 20:18:44 +00:00
Matthew Dempsky
0a04c0430e cmd/compile: restore constant folding optimization within OADDSTR
Change-Id: Ib55f2458c75aee49302f0dd4e2a819f9931a5ed3
Reviewed-on: https://go-review.googlesource.com/c/go/+/166982
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2019-03-13 18:24:16 +00:00
Matthew Dempsky
a1b5cb1d04 cmd/compile: simplify isGoConst
The only ways to construct an OLITERAL node are (1) a basic literal
from the source package, (2) constant folding within evconst (which
only folds Go language constants), (3) the universal "nil" constant,
and (4) implicit conversions of nil to some concrete type.

Passes toolstash-check.

Change-Id: I30fc6b07ebede7adbdfa4ed562436cbb7078a2ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/166981
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
2019-03-13 18:24:02 +00:00
Matthew Dempsky
3def15cd20 cmd/compile: move all constant folding logic into evconst
All setconst calls now happen within evconst. While here, get rid of
callrecv, which (incompletely) duplicates the logic of hascallchan.

Passes toolstash-check.

Change-Id: Ic67b9dd2a1b397d4bc25e8c8b6f81daf4f6cfb75
Reviewed-on: https://go-review.googlesource.com/c/go/+/166980
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2019-03-13 18:23:41 +00:00
Ilya Tocar
3aa7bbdbcb runtime: simplify readUnaligned
We already have a pure go code sequence that is compiled into single load.
Just use it everywhere, instead of pointer hackery.
Passes toolstash-check.

Change-Id: I0c42b5532fa9a5665da3385913609c6d42aaff27
Reviewed-on: https://go-review.googlesource.com/c/go/+/118568
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
2019-03-13 17:50:18 +00:00
Clément Chigot
82bd93991a syscall: add Chroot and Dup2 for aix/ppc64
Change-Id: Ib98c7ad91d83ce68811f5c671200462c5fee0fca
Reviewed-on: https://go-review.googlesource.com/c/go/+/167398
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
2019-03-13 16:52:32 +00:00
Michael Munday
04f1b65cc6 cmd/compile: try and access last argument first in rulegen
This reduces the number of extra bounds check hints we need to
insert. For example, rather than producing:

	_ = v.Args[2]
	x := v.Args[0]
	y := v.Args[1]
	z := v.Args[2]

We now produce:

	z := v.Args[2]
	x := v.Args[0]
	y := v.Args[1]

This gets rid of about 7000 lines of code from the rewrite rules.

Change-Id: I1291cf0f82e8d035a6d65bce7dee6cedee04cbcd
Reviewed-on: https://go-review.googlesource.com/c/go/+/167397
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2019-03-13 15:11:37 +00:00
Bryan C. Mills
5d4fa147c7 cmd/go/internal/modload: remove unused InitGoMod function
Change-Id: I0223d935184017e841d56abe114d78b670457c5a
Reviewed-on: https://go-review.googlesource.com/c/go/+/167437
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2019-03-13 14:51:16 +00:00
Carlos Eduardo Seo
4ba69a9a17 cmd/compile: add processor level selection support to ppc64{,le}
ppc64{,le} processor level selection allows the compiler to generate instructions
targeting newer processors and processor-specific optimizations without breaking
compatibility with our current baseline. This feature introduces a new environment
variable, GOPPC64.

GOPPC64 is a GOARCH=ppc64{,le} specific option, for a choice between different
processor levels (i.e. Instruction Set Architecture versions) for which the
compiler will target. The default is 'power8'.

Change-Id: Ic152e283ae1c47084ece4346fa002a3eabb3bb9e
Reviewed-on: https://go-review.googlesource.com/c/go/+/163758
Run-TryBot: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
2019-03-13 14:44:02 +00:00
David Chase
82af9e6749 cmd/compile: move statement marks from jumps to targets
When a jump at the end of a block is about to be marked as
a statement, if the first real instruction in the target
block is also a statement for the same line, remove the
mark from the jump.

This is a first effort at a minimal-harm heuristic.
A better heuristic might skip over any "not-statement"
values preceding a definitely marked value.

Fixes #29443.

Change-Id: Ibd52783713b4936e0c2dfda8d708bf186f33b00a
Reviewed-on: https://go-review.googlesource.com/c/go/+/159977
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alessandro Arzilli <alessandro.arzilli@gmail.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2019-03-13 14:40:36 +00:00
Bryan C. Mills
bd680d94a0 cmd/go/internal/{modconv,modfetch,modload}: set modfetch proxy URL in tests
Fixes #30571

Change-Id: Id4c74e83ee58a080d1c2894ae5ebdbf4aeb1ce42
Reviewed-on: https://go-review.googlesource.com/c/go/+/167084
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2019-03-13 14:37:02 +00:00
Daniel Martí
2f02daaa46 cmd/go/internal/base: remove MergeEnvLists
This internally exported function allowed merging environment variable
lists, and was mostly a convenience for the rest of cmd/go/internal.
It seems to date all the way back to 2013.

However, since CL 37586 in early 2017, os/exec has already taken care of
deduplicating environment variable lists. Thus, it's unnecessary for
cmd/go to take care of that before calling exec.Cmd.Start.

Moreover, because os/exec will deduplicate the list in any case, we're
adding extra work in all these scenarios.

Finally, remove an unnecessary addition of GOROOT= in internal/tool.
cfg.OrigEnv may not have the correct GOROOT set up, but os.Environ does;
cmd/go's main function makes sure of that.

Change-Id: I1f92f65fb927dc15bc7b0397cfd1a572b6337bb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/164703
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2019-03-13 13:51:03 +00:00
Daniel Martí
5f40351708 encoding/base64: speed up the decoder
Most of the decoding time is spent in the first Decode loop, since the
rest of the function only deals with the few remaining bytes. Any
unnecessary work done in that loop body matters tremendously.

One such unnecessary bottleneck was the use of the enc.decodeMap table.
Since enc is a pointer receiver, and the field is used within the
non-inlineable function decode64, the decoder must perform a nil check
at every iteration.

To fix that, move the enc.decodeMap uses to the parent function, where
we can lift the nil check outside the loop. That gives roughly a 15%
speed-up. The function no longer performs decoding per se, so rename it.
While at it, remove the now unnecessary receivers.

An unfortunate side effect of this change is that the loop now contains
eight bounds checks on src instead of just one. However, not having to
slice src plus the nil check removal well outweigh the added cost.

The other piece that made decode64 slow was that it wasn't inlined, and
had multiple branches. Use a simple bitwise-or trick suggested by Roger
Peppe, and collapse the rest of the bitwise logic into a single
expression. Inlinability and the reduced branching give a further 10%
speed-up.

Finally, add these two functions to TestIntendedInlining, since we want
them to stay inlinable.

Apply the same refactor to decode32 for consistency, and to let 32-bit
architectures see a similar performance gain for large inputs.

name                 old time/op    new time/op    delta
DecodeString/2-8       47.3ns ± 1%    45.8ns ± 0%   -3.28%  (p=0.002 n=6+6)
DecodeString/4-8       55.8ns ± 2%    51.5ns ± 0%   -7.71%  (p=0.004 n=5+6)
DecodeString/8-8       64.9ns ± 0%    61.7ns ± 0%   -4.99%  (p=0.004 n=5+6)
DecodeString/64-8       238ns ± 0%     198ns ± 0%  -16.54%  (p=0.002 n=6+6)
DecodeString/8192-8    19.5µs ± 0%    14.6µs ± 0%  -24.96%  (p=0.004 n=6+5)

name                 old speed      new speed      delta
DecodeString/2-8     84.6MB/s ± 1%  87.4MB/s ± 0%   +3.38%  (p=0.002 n=6+6)
DecodeString/4-8      143MB/s ± 2%   155MB/s ± 0%   +8.41%  (p=0.004 n=5+6)
DecodeString/8-8      185MB/s ± 0%   195MB/s ± 0%   +5.29%  (p=0.004 n=5+6)
DecodeString/64-8     369MB/s ± 0%   442MB/s ± 0%  +19.78%  (p=0.002 n=6+6)
DecodeString/8192-8   560MB/s ± 0%   746MB/s ± 0%  +33.27%  (p=0.004 n=6+5)

Updates #19636.

Change-Id: Ib839577b0e3f5a2bb201f5cae580c61365d92894
Reviewed-on: https://go-review.googlesource.com/c/go/+/151177
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: roger peppe <rogpeppe@gmail.com>
2019-03-13 10:39:58 +00:00
Mikio Hara
a5fdd58c84 runtime, internal/poll, net: report event scanning error on read event
This change makes it possible the runtime-integrated network poller and
APIs in the package internal/poll to report an event scanning error on a
read event.

The latest Go releases open up the way of the manipulation of the poller
for users. On the other hand, it starts misleading users into believing
that the poller accepts any user-configured file or socket perfectly
because of not reporting any error on event scanning, as mentioned in
issue 30426. The initial implementation of the poller was designed for
just well-configured, validated sockets produced by the package net.
However, the assumption is now obsolete.

Fixes #30624.

Benchmark results on linux/amd64:

benchmark                              old ns/op     new ns/op     delta
BenchmarkTCP4OneShot-4                 24649         23979         -2.72%
BenchmarkTCP4OneShotTimeout-4          25742         24411         -5.17%
BenchmarkTCP4Persistent-4              5139          5222          +1.62%
BenchmarkTCP4PersistentTimeout-4       4919          4892          -0.55%
BenchmarkTCP6OneShot-4                 21182         20767         -1.96%
BenchmarkTCP6OneShotTimeout-4          23364         22305         -4.53%
BenchmarkTCP6Persistent-4              4351          4366          +0.34%
BenchmarkTCP6PersistentTimeout-4       4227          4255          +0.66%
BenchmarkTCP4ConcurrentReadWrite-4     2309          1839          -20.36%
BenchmarkTCP6ConcurrentReadWrite-4     2180          1791          -17.84%

benchmark                              old allocs     new allocs   delta
BenchmarkTCP4OneShot-4                 26             26           +0.00%
BenchmarkTCP4OneShotTimeout-4          26             26           +0.00%
BenchmarkTCP4Persistent-4              0              0            +0.00%
BenchmarkTCP4PersistentTimeout-4       0              0            +0.00%
BenchmarkTCP6OneShot-4                 26             26           +0.00%
BenchmarkTCP6OneShotTimeout-4          26             26           +0.00%
BenchmarkTCP6Persistent-4              0              0            +0.00%
BenchmarkTCP6PersistentTimeout-4       0              0            +0.00%
BenchmarkTCP4ConcurrentReadWrite-4     0              0            +0.00%
BenchmarkTCP6ConcurrentReadWrite-4     0              0            +0.00%

benchmark                              old bytes     new bytes     delta
BenchmarkTCP4OneShot-4                 2000          2000          +0.00%
BenchmarkTCP4OneShotTimeout-4          2000          2000          +0.00%
BenchmarkTCP4Persistent-4              0             0             +0.00%
BenchmarkTCP4PersistentTimeout-4       0             0             +0.00%
BenchmarkTCP6OneShot-4                 2144          2144          +0.00%
BenchmarkTCP6OneShotTimeout-4          2144          2145          +0.05%
BenchmarkTCP6Persistent-4              0             0             +0.00%
BenchmarkTCP6PersistentTimeout-4       0             0             +0.00%
BenchmarkTCP4ConcurrentReadWrite-4     0             0             +0.00%
BenchmarkTCP6ConcurrentReadWrite-4     0             0             +0.00%

Change-Id: Iab60e504dff5639e688dc5420d852f336508c0af
Reviewed-on: https://go-review.googlesource.com/c/go/+/166497
Run-TryBot: Mikio Hara <mikioh.public.networking@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2019-03-13 08:53:02 +00:00
Clément Chigot
a891f2e2ae cmd: always allow bigtoc generation with gcc on aix/ppc64
-mcmodel=large and -Wl,-bbigtoc must always be passed to gcc in order to
prevent TOC overflow error. However, a warning is still issued by ld. It
is removed as it doesn't give any useful information.

Change-Id: I95a78e8993cc7b5c0f329654d507409785f7eea6
Reviewed-on: https://go-review.googlesource.com/c/go/+/164008
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2019-03-13 04:17:56 +00:00
Agniva De Sarker
b6544a2a87 testing/cover: improve message when a package has no statements
Fixes #25492

Change-Id: Ic1496857524dad0c0a77f3bb80fa084c9bf00aa9
Reviewed-on: https://go-review.googlesource.com/c/go/+/155777
Run-TryBot: Agniva De Sarker <agniva.quicksilver@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
2019-03-13 04:11:58 +00:00
Clément Chigot
0ff9df6b53 cmd: disable DWARF with old ld on aix/ppc64
DWARF relocations isn't working with some older ld, because of
-Wl,-bnoobjreorder which is needed on Go.
This commit checks ld's version and disable DWARF generation in cmd/link
if it's too old. Some tests must therefore be skipped.

Change-Id: I2e794c263eb0dfe0b42e7062fb80c26f086b44d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/164007
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2019-03-13 02:33:58 +00:00
Robert Griesemer
bea58ef352 cmd/compile: don't report redundant error for invalid integer literals
Fixes #30722.

Change-Id: Ia4c6e37282edc44788cd8af3f6cfa10895a19e4f
Reviewed-on: https://go-review.googlesource.com/c/go/+/166519
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2019-03-12 22:59:12 +00:00
Robert Griesemer
fbc5acbd70 cmd/compile: remove work-arounds for handling underscores in numbers
With math/big supporting underscores directly, there is no need to
manually remove them before calling the math/big conversion routines.

Updates #28493.

Change-Id: I6f865c8f87c3469ffd6c33f960ed540135055226
Reviewed-on: https://go-review.googlesource.com/c/go/+/166417
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2019-03-12 22:59:06 +00:00
Robert Griesemer
cfa93ba51f math/big: add support for underscores '_' in numbers
The primary change is in nat.scan which now accepts underscores for base 0.
While at it, streamlined error handling in that function as well.
Also, improved the corresponding test significantly by checking the
expected result values also in case of scan errors.

The second major change is in scanExponent which now accepts underscores when
the new sepOk argument is set. While at it, essentially rewrote that
function to match error and underscore handling of nat.scan more closely.
Added a new test for scanExponent which until now was only tested
indirectly.

Finally, updated the documentation for several functions and added many
new test cases to clients of nat.scan.

A major portion of this CL is due to much better test coverage.

Updates #28493.

Change-Id: I7f17b361b633fbe6c798619d891bd5e0a045b5c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/166157
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
2019-03-12 22:58:58 +00:00
Daniel Martí
c4078a1998 text/tabwriter: use a single defer per Write call
Lines with single cells prompt a flush. Unfortunately, a call to
Writer.Flush also means two defers, which is an expensive operation to
do if many lines consist of single cells.

This is common when formatting code with aligned comments. Most lines
aren't going to have any comments at all, so the performance hit is
going to be noticeable.

The Write method already has a "defer handlePanic" of its own, so we
don't need to worry about panics leaking out. The error will now mention
"Write" instead of "Flush" if a panic is encountered during that nested
flush, but arguably that's a good thing; the user called Write, not
Flush.

For the reset call, add a non-deferred call as part of flushNoDefers, as
that's still necessary. Otherwise, the exported Flush method still does
a "defer b.reset".

The current tabwriter benchmarks are unaffected, since they don't
contain many single-cell lines, and because lines are written one at a
time. For that reason, we add a benchmark which has both of these
characteristics.

name    old time/op    new time/op    delta
Code-8    2.72µs ± 0%    1.77µs ± 0%  -34.88%  (p=0.000 n=6+5)

name    old alloc/op   new alloc/op   delta
Code-8      648B ± 0%      648B ± 0%     ~     (all equal)

name    old allocs/op  new allocs/op  delta
Code-8      13.0 ± 0%      13.0 ± 0%     ~     (all equal)

Perhaps unsurprisingly, go/printer also gets a bit faster, as it too
buffers its output before writing it to tabwriter.

name     old time/op  new time/op  delta
Print-8  6.53ms ± 0%  6.39ms ± 0%  -2.22%  (p=0.008 n=5+5)

Change-Id: Ie01fea5ced43886a9eb796cb1e6c810f7a810853
Reviewed-on: https://go-review.googlesource.com/c/go/+/166797
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2019-03-12 22:34:30 +00:00
Bryan C. Mills
01d1dc4172 cmd/go: fix typo in GoGetInsecure to actually set GOPROXY
I typo'd this variable in CL 165745, and neither I, the reviewer, nor the TryBots noticed.
But the longtest builder noticed, and it's not happy about it.

Updates #30571

Change-Id: I5e3d267346407855ec0d1f340a72dc2c521ecc63
Reviewed-on: https://go-review.googlesource.com/c/go/+/167086
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2019-03-12 21:08:33 +00:00
Bryan C. Mills
af13cfc3a2 ../test: set GOPATH in nosplit.go
This test invokes 'go build', so in module mode it needs a module
cache to guard edits to go.mod.

Fixes #30776

Change-Id: I89ebef1fad718247e7f972cd830e31d6f4a83e4c
Reviewed-on: https://go-review.googlesource.com/c/go/+/167085
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2019-03-12 20:46:29 +00:00
Josh Bleecher Snyder
53948127d3 cmd/compile: make rulegen magic variable prediction more precise
The sheer length of the generated rules files makes my
editor and git client unhappy.
This change is a small step towards shortening them.

We recognize a few magic variables during rulegen: b, config, fe, typ.
Of these, only b appears prone to false positives.
By tightening the heuristic and fixing one case in MIPS.rules,
we can make the heuristic enough that it has no failures.
That allows us to remove the hedge assignments to _,
removing 3000 pointless lines of code.

Change-Id: I080cde5db28c8277cb3fd9ddcd829306c9a27785
Reviewed-on: https://go-review.googlesource.com/c/go/+/166979
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2019-03-12 20:13:46 +00:00
Bryan C. Mills
f54b8909ac cmd/go/internal/modload: treat a 'std' module outside GOROOT/src as an ordinary module
Fixes #30756

Change-Id: I046d43df56faac8fc09d53dc1e87a014dd6d530b
Reviewed-on: https://go-review.googlesource.com/c/go/+/167080
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
2019-03-12 20:10:13 +00:00
Bryan C. Mills
718fdd7b48 cmd/go/internal/cfg: remove unused Gopath variable
Change-Id: Ib268157674824fd7552d3c36a61eccf8c720eaeb
Reviewed-on: https://go-review.googlesource.com/c/go/+/167083
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2019-03-12 20:09:48 +00:00
Shubham Sharma
fda1dc2939 cmd/go: document GOGCCFLAGS
Fixes #30123

Change-Id: I310b89a344a262bb758d39dfdd485ed2940cc6aa
Reviewed-on: https://go-review.googlesource.com/c/go/+/166577
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2019-03-12 19:38:53 +00:00
Bryan C. Mills
334e750917 cmd: ensure that GOPATH is always valid in subprocesses that execute 'go build'
GOPATH/pkg contains, among other things, the module cache (and associated lockfiles).

Fixes #30776

Change-Id: I305cb3c0daab8cedd2e6ad235d4733f66af18723
Reviewed-on: https://go-review.googlesource.com/c/go/+/167082
Reviewed-by: Jay Conrod <jayconrod@google.com>
2019-03-12 18:58:04 +00:00
Bryan C. Mills
49448badb6 cmd/internal/obj/x86: avoid os.Chdir in issue19518_test.go
Chdir leaves the test in the wrong working directory if objdumpOutput
calls t.Fatalf (or panics), and it isn't necessary here anyway. Set
the Dir field on the commands instead.

Change-Id: I9f0eb0d4f8d15043f1e13472126ca1a1ce4b7cb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/167081
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
2019-03-12 18:55:20 +00:00
Robert Griesemer
a083648165 spec: document new Go2 number literals
This CL documents the new binary and octal integer literals,
hexadecimal floats, generalized imaginary literals and digit
separators for all number literals in the spec.

Added empty lines between abutting paragraphs in some places
(a more thorough cleanup can be done in a separate CL).

A minor detail: A single 0 was considered an octal zero per the
syntax (decimal integer literals always started with a non-zero
digit). The new octal literal syntax allows 0o and 0O prefixes
and when keeping the respective octal_lit syntax symmetric with
all the others (binary_lit, hex_lit), a single 0 is not automatically
part of it anymore. Rather than complicating the new octal_lit syntax
to include 0 as before, it is simpler (and more natural) to accept
a single 0 as part of a decimal_lit. This is purely a notational
change.

R=Go1.13

Updates #12711.
Updates #19308.
Updates #28493.
Updates #29008.

Change-Id: Ib9fdc6e781f6031cceeed37aaed9d05c7141adec
Reviewed-on: https://go-review.googlesource.com/c/go/+/161098
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2019-03-12 16:13:39 +00:00
Ben Hoyt
4b4f222a0d bytes, strings: speed up TrimSpace 4-5x for common ASCII cases
This change adds a fast path for ASCII strings to both
strings.TrimSpace and bytes.TrimSpace. It doesn't slow down the
non-ASCII path much, if at all.

I added benchmarks for strings.TrimSpace as it didn't have any, and
I fleshed out the benchmarks for bytes.TrimSpace as it just had one
case (for ASCII). The benchmarks (and the code!) are now the same
between the two versions. Below are the benchmark results:

strings.TrimSpace:

name                      old time/op  new time/op  delta
TrimSpace/NoTrim-8        18.6ns ± 0%   3.8ns ± 0%  -79.53%  (p=0.000 n=5+4)
TrimSpace/ASCII-8         33.5ns ± 2%   6.0ns ± 3%  -82.05%  (p=0.008 n=5+5)
TrimSpace/SomeNonASCII-8  97.1ns ± 1%  88.6ns ± 1%   -8.68%  (p=0.008 n=5+5)
TrimSpace/JustNonASCII-8   144ns ± 0%   143ns ± 0%     ~     (p=0.079 n=4+5)

bytes.TrimSpace:

name                      old time/op  new time/op  delta
TrimSpace/NoTrim-8        18.9ns ± 1%   4.1ns ± 1%  -78.34%  (p=0.008 n=5+5)
TrimSpace/ASCII-8         29.9ns ± 0%   6.3ns ± 1%  -79.06%  (p=0.008 n=5+5)
TrimSpace/SomeNonASCII-8  91.5ns ± 0%  82.3ns ± 0%  -10.03%  (p=0.008 n=5+5)
TrimSpace/JustNonASCII-8   150ns ± 0%   150ns ± 0%     ~     (all equal)

Fixes #29122

Change-Id: Ica45cd86a219cadf60173ec9db260133cd1d7951
Reviewed-on: https://go-review.googlesource.com/c/go/+/152917
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2019-03-12 15:52:17 +00:00
Elias Naur
10aede26d0 misc/android: fix detection of GOROOT tests
strings.HasPrefix is not good enough to determine whether a path
is a subdirectory of another because it does not respect path
boundaries. filepath.Rel is good eonugh as long as we filter out results
that use parent directories, "..".

Hopefully fix the android emulator builders on the subrepositories.

Change-Id: I17ee7e0028c0b0b26a6c5f67629f53c9a660c6e5
Reviewed-on: https://go-review.googlesource.com/c/go/+/167117
Run-TryBot: Elias Naur <mail@eliasnaur.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2019-03-12 15:47:18 +00:00
Bryan C. Mills
d6891bd480 cmd/go: search the target for patterns when -mod=vendor is set
This fixes the root cause of the bootstrap failure reported in
https://groups.google.com/d/msg/golang-dev/xcVJDj5GJ84/U0pVnUOnBwAJ.

Updates #30228

Change-Id: I9ce0898922a5aac1f61ceff30319cf88031676c4
Reviewed-on: https://go-review.googlesource.com/c/go/+/167079
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
2019-03-12 15:44:29 +00:00
Bryan C. Mills
781da44091 cmd/dist: write and use a go.mod file in the bootstrap directory
Updates #30228

Change-Id: Ica28525b31a8a787875c147e16274eba8f4dbffc
Reviewed-on: https://go-review.googlesource.com/c/go/+/167078
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
2019-03-12 15:43:46 +00:00
Bryan C. Mills
6c527aa583 cmd/dist: revert mod=vendor change accidentally included in CL 164623
I thought I had removed all of the 'mod=vendor' hacks I had inserted
previously, but apparently missed this one in a bad merge or rebase.

Updates #30228

Change-Id: Ia5aea754bf986458373fefd08fa9dd3941e31e43
Reviewed-on: https://go-review.googlesource.com/c/go/+/167077
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
2019-03-12 14:57:47 +00:00
fanzha02
a85afef277 cmd/compile: add handling for new floating-point comparisons flags
The CL 164718 adds new condition flags for floating-point comparisons
in arm64 backend, but dose not add the handling in rewrite.go for
corresponding Ops, which causes issue 30679. And this CL fixes this
issue.

Fixes #30679

Change-Id: I8acc749f78227c3e9e74fa7938f05fb442fb62c6
Reviewed-on: https://go-review.googlesource.com/c/go/+/166579
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2019-03-12 14:01:26 +00:00
Brian Kessler
ef891e1c83 math/big: implement Int.TrailingZeroBits
Implemented via the underlying nat.trailingZeroBits.

Fixes #29578

Change-Id: If9876c5a74b107cbabceb7547bef4e44501f6745
Reviewed-on: https://go-review.googlesource.com/c/go/+/160681
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2019-03-12 13:18:27 +00:00
Tobias Klauser
14a58d65e3 internal/bytealg: share code for equal functions on arm
Move the shared code into byteal.memeqbody. This will allow to implement
optimizations (e.g. for #29001) in a single function.

Change-Id: Iaa34ddeb7068d92c35a8b4e581b7fd92da56535c
Reviewed-on: https://go-review.googlesource.com/c/go/+/166677
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2019-03-12 07:27:56 +00:00
Tobias Klauser
21a634e2e9 os: drop special case for FreeBSD 10.4 in newFile
Support for FreeBSD 10 will be dropped with Go 1.13, so revert the
workaround introduced in CL 157099.

Updates #29633
Updates #27619

Change-Id: I1a2e50d3f807a411389f3db07c0f4535a590da02
Reviewed-on: https://go-review.googlesource.com/c/go/+/165801
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2019-03-12 06:33:01 +00:00
Bryan C. Mills
9fedec79ed go/build: bypass importGo if srcDir is in GOROOT/src
This fixes the builder flake observed in
https://build.golang.org/log/84fe80f8f091b9cef639b3ae2422a673f1462810,
which could be replicated by running

	GOPROXY=off GOPATH=$(mktemp -d) go test go/internal/srcimporter

Updates #30228
Fixes #30760

Change-Id: Ibf8b7a2e211611960b074b74af91acd4f0196edb
Reviewed-on: https://go-review.googlesource.com/c/go/+/166977
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
2019-03-12 05:00:20 +00:00
Bryan C. Mills
8b2a2d0394 Revert "cmd/go: change the default value of GO111MODULE to 'on'"
This reverts commit cf4691650c
(CL 162698).

Reason for revert: broke make.bash bootstrapping from head.

Change-Id: I3de6d26b1af9038c6b92dec88667bfa734060a41
Reviewed-on: https://go-review.googlesource.com/c/go/+/166985
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2019-03-12 02:07:34 +00:00