Rounding ties to even is statistically useful for some applications.
This implementation completes IEEE float64 rounding mode support (in
addition to Round, Ceil, Floor, Trunc).

This function avoids subtle faults found in ad-hoc implementations, and
is simple enough to be inlined by the compiler.

Fixes #21748

Change-Id: I09415df2e42435f9e7dabe3bdc0148e9b9ebd609
Reviewed-on: https://go-review.googlesource.com/61211Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Eliminates lots of ad hoc code for recognizing the same thing in
different ways.

Passes toolstash-check.

Change-Id: Ic0bb005308e96331b4ef30f455b860e476725b61
Reviewed-on: https://go-review.googlesource.com/73190
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

A single database connection ususally maps to a single session.
A connection pool is logically also a session pool. Most
sessions have a way to reset the session state which is desirable
to prevent one bad query from poisoning another later query with
temp table name conflicts or other persistent session resources.

It also lets drivers provide users with better error messages from
queryies when the underlying transport or query method fails.
Internally the driver connection should now be marked as bad, but
return the actual connection. When ResetSession is called on the
connection it should return driver.ErrBadConn to remove it from
the connection pool. Previously drivers had to choose between
meaningful error messages or poisoning the connection pool.

Lastly update TestPoolExhaustOnCancel from relying on a
WAIT query fixing a flaky timeout issue exposed by this
change.

Fixes #22049
Fixes #20807

Change-Id: I2b5df6d954a38d0ad93bf1922ec16e74c827274c
Reviewed-on: https://go-review.googlesource.com/73033
Run-TryBot: Daniel Theophanes <kardianos@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Fixes #20986.

Change-Id: Ic3cf5c0ab260f259ecff7b92cfdf5f4ae432aef3
Reviewed-on: https://go-review.googlesource.com/73072
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>

Instead of the hand-written control flow analysis in debug info
generation, use a reverse postorder traversal, which is basically the
same thing. It should be slightly faster.

More importantly, the previous version simply gave up in the case of
non-reducible functions, and produced output that caused a later stage
to crash. It turns out that there's a non-reducible function in
compress/flate, so that wasn't a theoretical issue.

With this change, all blocks will be visited, even for non-reducible
functions.

Change-Id: Id47536764ee93203c6b4105a1a3013fe3265aa12
Reviewed-on: https://go-review.googlesource.com/73110
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>

Fixes #19183

Change-Id: I11502d855f5b521b03ed7a63a990cca2d0ed4083
Reviewed-on: https://go-review.googlesource.com/70931Reviewed-by: Ian Lance Taylor <iant@golang.org>

This reverts commit 2620ac3a.

Reason for revert: broke all the builds.

Change-Id: I26fc09a13f5f80fa708de66c843442ff9d934694
Reviewed-on: https://go-review.googlesource.com/73050Reviewed-by: Russ Cox <rsc@golang.org>

Fix a bug introduced in patch 2 of
https://go-review.googlesource.com/72630 (sense of a map
lookup test was accidentally flipped).

Change-Id: Icc6096ee50be4605fa7542b9fd855c13b8aff090
Reviewed-on: https://go-review.googlesource.com/72850
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>

A single database connection ususally maps to a single session.
A connection pool is logically also a session pool. Most
sessions have a way to reset the session state which is desirable
to prevent one bad query from poisoning another later query with
temp table name conflicts or other persistent session resources.

It also lets drivers provide users with better error messages from
queryies when the underlying transport or query method fails.
Internally the driver connection should now be marked as bad, but
return the actual connection. When ResetSession is called on the
connection it should return driver.ErrBadConn to remove it from
the connection pool. Previously drivers had to choose between
meaningful error messages or poisoning the connection pool.

Lastly update TestPoolExhaustOnCancel from relying on a
WAIT query fixing a flaky timeout issue exposed by this
change.

Fixes #22049
Fixes #20807

Change-Id: Idffa1a7ca9ccfe633257c4a3ae299b864f46c5b6
Reviewed-on: https://go-review.googlesource.com/67630Reviewed-by: Ian Lance Taylor <iant@golang.org>

Drivers shouldn't need to implement both Queryer and QueryerContext,
they should just implement QueryerContext. Same with Execer and
ExecerContext. This CL tests for QueryContext and ExecerContext
first so drivers do not need to implement Queryer and Execer
with an empty definition.

Fixes #21663

Change-Id: Ifbaa71da669f4bc60f8da8c41a04a4afed699a9f
Reviewed-on: https://go-review.googlesource.com/65733Reviewed-by: Ian Lance Taylor <iant@golang.org>

This change modifies go to create iOS arm64 binaries that pass iTunes
upload validation. Tested with xcode 9.0.1 macOS 10.13.

Fixes #22402.

Change-Id: I3f14c6ac85065e2da88d06edc8682947f6f1cd47
Reviewed-on: https://go-review.googlesource.com/72730Reviewed-by: David Crawshaw <crawshaw@golang.org>

Also includes all derived values as well as
vendored packages.

Generated by running
    UNICODE_VERSION=10.0.0 go generate
in golang.org/x/text

and modified by hand to add the tests and
entries in next.txt for new script and properties.

Closes Issue #21471

Change-Id: I1d10ee3887bd1fd3d5a756ee0d04bd6ec2814ba1
Reviewed-on: https://go-review.googlesource.com/63953
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Bonventre <andybons@golang.org>

The ErrQuote variable is only returned when a parsing error
occurs within a quoted string. Make that clear in the message.

Change-Id: I06ad5a9edb41afedde193c4f8b93551bb8342bbb
Reviewed-on: https://go-review.googlesource.com/72794Reviewed-by: Avelino <t@avelino.xxx>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

We should be referring to ParseError.Err, which is the underlying error,
not ParseError.Error, which is the error method.

Change-Id: Ic3cef5ecbe1ada5fa14b9573222f29da8fc9a8d5
Reviewed-on: https://go-review.googlesource.com/72450Reviewed-by: Tim Cooper <tim.cooper@layeh.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Make netpollopen return what Windows GetLastError API returns.
It is probably copy / paste error from long time ago.

Change-Id: I28f78718c15fef3e8b5f5d11a259533d7e9c6185
Reviewed-on: https://go-review.googlesource.com/72592Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>

If n.Type==nil after typechecking, then we should have already
reported a more useful error somewhere else. Just return 0 in
evalunsafe without trying to do anything else that's likely to cause
problems.

Also, further split out issue7525.go into more test files, because
cmd/compile reports at most one typechecking loop per compilation
unit.

Fixes #22351.

Change-Id: I3ebf505f72c48fcbfef5ec915606224406026597
Reviewed-on: https://go-review.googlesource.com/72251
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Robert Griesemer <gri@golang.org>

decoder.decode() was defering close of lzw.decoders created for each
frame in a loop, thus increasing heap usage (referenced object + defered
function) until decode() returns. Memory increased proportionally to the
number of frames. Fix this by moving the sImageDescriptor case block
into its own method.

Fixes #22237

Change-Id: I819617ea7e539e13c04bc11112f339645391ddb9
Reviewed-on: https://go-review.googlesource.com/70370
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>

Fixes #22282.

Change-Id: I4097e9cbd590ab6c8b1511a3b752c6ac98ac819b
Reviewed-on: https://go-review.googlesource.com/72792Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

When enhanced DWARF location list generation is enabled (via internal
option -dwarflocationlists), variable entries were missing for "large"
(non-decomposable) locals and formals. From the debugging perspective,
this makes it appear that the variable doesn't exist, which is
probably not what we want. This change insures that a formal/local DIE
is created for these vars (with correct type, line, etc) but with a
conservative ("no info") location.

Change-Id: I10b2e9a51a60c7b4c748e987cdec5f2d8b2837d5
Reviewed-on: https://go-review.googlesource.com/72630
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>

Fixes #22377.

Change-Id: I0a0e1bde558df964f0961dc4cfc305e72d590e1a
Reviewed-on: https://go-review.googlesource.com/72690Reviewed-by: Alan Donovan <adonovan@google.com>

The addressing mode of global variable was missing, whereas the
compiler may make use of it, causing "illegal combination" error.
This CL adds support of that addressing mode.

Fixes #22390.

Change-Id: Ic8eade31aba73e6fb895f758ee7f277f8f1832ef
Reviewed-on: https://go-review.googlesource.com/72610
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>

* replace a copy of IsMethod with a call of it.
* a few more switches where they simplify the code.
* prefer composite literals over "n := new(...); n.x = y; ...".
* use defers to get rid of three goto labels.
* rewrite updateHasCall into two funcs to remove gotos.

Passes toolstash-check on std cmd.

Change-Id: Icb5442a89a87319ef4b640bbc5faebf41b193ef1
Reviewed-on: https://go-review.googlesource.com/72070
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

Currently, benchmarking compile performance under -l=4 is confounded
by -l=2 enabling eager typechecking of unused inline function bodies
for debugging. This isn't logically an "inlining aggressiveness"
level, so instead move this logic under the -d umbrella flag.

Change-Id: I713f68952efbe25b6941d3ebc2f3707ccbbd6240
Reviewed-on: https://go-review.googlesource.com/72253
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

Increasing the map size with the benchmark iteration count
introduced non-linearities and made benchmark runs slow when
increasing benchtime.

Rework the benchmark to use a map size independent of the
iteration count and instead re-fill it when it becomes empty.

Fixes #21546

Change-Id: Iafb6eb225e81830263f30b3aba0d449c361aec32
Reviewed-on: https://go-review.googlesource.com/57650
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

Previously, the code would only check (w*h), not (w*h*bpp).

Fixes #22304

Change-Id: Iaca26d916fe4b894d460448c416b1e0b9fd68e44
Reviewed-on: https://go-review.googlesource.com/72350Reviewed-by: Rob Pike <r@golang.org>

Running test.bash goes from 30s to 10s on a linux workstation.

(The coming pkg cache work in cmd/go would presumably do the same thing,
but this makes all.bash faster today.)

Change-Id: I8c9b0400071a412fce55b386e939906bb1c1d84d
Reviewed-on: https://go-review.googlesource.com/72330
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

CL 72150 fixes #22352 by reverting the problematic parts of that CL
where the line number and column number were inconsistent with each other.
This CL adds back functionality to address the issue that CL 72150
was trying to solve in the first place. That is, it reports the starting
line of the record, so that users have a frame of reference to start with
when debugging what went wrong.

In the event of gnarly CSV files with multiline quoted strings, a parse
failure likely occurs somewhere between the start of the record and
the point where the parser finally detected an error.
Since ParserError.{Line,Column} reports where the *error* occurs, we
add a RecordLine field to report where the record starts.

Also take this time to cleanup and modernize TestRead.

Fixes #19019
Fixes #22352

Change-Id: I16cebf0b81922c35f75804c7073e9cddbfd11a04
Reviewed-on: https://go-review.googlesource.com/72310Reviewed-by: Ian Lance Taylor <iant@golang.org>

For #22095

Change-Id: Idcfdfe8a94db8626392658bb93429454238f648a
Reviewed-on: https://go-review.googlesource.com/70835
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Code essentially mirrors AMD64 implementation.

Change-Id: I39f7f099ce11fdc3772df039998cc11947bb22a2
Reviewed-on: https://go-review.googlesource.com/72270
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

windows version of Pipe function is implemented by calling
syscall.Pipe which returns handles inheritable by client process,
and then adjusting returned handles with syscall.CloseOnExec.

Just create non-inheritable handles in the first place.
Now that we don't have a race window in the code, drop use
of syscall.ForkLock.

Change-Id: Ie325da7c2397b5995db4a5ddb0117e2ce1745187
Reviewed-on: https://go-review.googlesource.com/72010Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

NewEncoder returns an io.Writer that writes all incoming bytes as
hexadecimal characters to the underlying io.Writer. NewDecoder returns an
io.Reader that does the inverse.

Fixes #21590

Change-Id: Iebe0813faf365b42598f19a9aa41768f571dc0a8
Reviewed-on: https://go-review.googlesource.com/70210Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

For #22095

Change-Id: Iba3dffc782cecc15ea0e90a971a2734729984945
Reviewed-on: https://go-review.googlesource.com/70834
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

For #22095

Change-Id: Ica6b3391541fe5a0355620d7c4a5107cf53eee82
Reviewed-on: https://go-review.googlesource.com/70833
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

The Reader implementation is slow because it operates on a rune-by-rune
basis via bufio.Reader.ReadRune. We speed this up by operating on entire
lines that we read from bufio.Reader.ReadSlice.

In order to ensure that we read the full line, we augment ReadSlice
in our Reader.readLine method to automatically expand the slice if
bufio.ErrBufferFull is every hit.

This change happens to fix #19410 because it no longer relies on
rune-by-rune parsing and only searches for the relevant delimiter rune.

In order to keep column accounting simple and consistent, this change
reverts parts of CL 52830.

This CL is an alternative to CL 36270 and builds on some of the ideas
from that change by Diogo Pinela.

name                                     old time/op    new time/op    delta
Read-8                                   3.12µs ± 1%    2.54µs ± 2%  -18.76%   (p=0.000 n=10+9)
ReadWithFieldsPerRecord-8                3.12µs ± 1%    2.53µs ± 1%  -18.91%    (p=0.000 n=9+9)
ReadWithoutFieldsPerRecord-8             3.13µs ± 0%    2.57µs ± 3%  -18.07%  (p=0.000 n=10+10)
ReadLargeFields-8                        52.3µs ± 1%     5.3µs ± 2%  -89.93%   (p=0.000 n=10+9)
ReadReuseRecord-8                        2.05µs ± 1%    1.40µs ± 1%  -31.48%   (p=0.000 n=10+9)
ReadReuseRecordWithFieldsPerRecord-8     2.05µs ± 1%    1.41µs ± 0%  -31.03%   (p=0.000 n=10+9)
ReadReuseRecordWithoutFieldsPerRecord-8  2.06µs ± 1%    1.40µs ± 1%  -31.70%   (p=0.000 n=9+10)
ReadReuseRecordLargeFields-8             50.9µs ± 0%     4.1µs ± 3%  -92.01%  (p=0.000 n=10+10)

name                                     old alloc/op   new alloc/op
Read-8                                       664B ± 0%      664B ± 0%
ReadWithFieldsPerRecord-8                    664B ± 0%      664B ± 0%
ReadWithoutFieldsPerRecord-8                 664B ± 0%      664B ± 0%
ReadLargeFields-8                          3.94kB ± 0%    3.94kB ± 0%
ReadReuseRecord-8                           24.0B ± 0%     24.0B ± 0%
ReadReuseRecordWithFieldsPerRecord-8        24.0B ± 0%     24.0B ± 0%
ReadReuseRecordWithoutFieldsPerRecord-8     24.0B ± 0%     24.0B ± 0%
ReadReuseRecordLargeFields-8               2.98kB ± 0%    2.98kB ± 0%

name                                     old allocs/op  new allocs/op
Read-8                                       18.0 ± 0%      18.0 ± 0%
ReadWithFieldsPerRecord-8                    18.0 ± 0%      18.0 ± 0%
ReadWithoutFieldsPerRecord-8                 18.0 ± 0%      18.0 ± 0%
ReadLargeFields-8                            24.0 ± 0%      24.0 ± 0%
ReadReuseRecord-8                            8.00 ± 0%      8.00 ± 0%
ReadReuseRecordWithFieldsPerRecord-8         8.00 ± 0%      8.00 ± 0%
ReadReuseRecordWithoutFieldsPerRecord-8      8.00 ± 0%      8.00 ± 0%
ReadReuseRecordLargeFields-8                 12.0 ± 0%      12.0 ± 0%

Updates #22352
Updates #19019
Fixes #16791
Fixes #19410

Change-Id: I31c27cfcc56880e6abac262f36c947179b550bbf
Reviewed-on: https://go-review.googlesource.com/72150Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

On systems that use kqueue, we always register descriptors for both
EVFILT_READ and EVFILT_WRITE. On at least FreeBSD and OpenBSD, when
the write end of a pipe is registered for EVFILT_READ and EVFILT_WRITE
events, and the read end of the pipe is closed, kqueue reports an
EVFILT_READ event with EV_EOF set, but does not report an EVFILT_WRITE
event. Since the write to the pipe is waiting for an EVFILT_WRITE
event, closing the read end of a pipe can cause the write end to hang
rather than attempt another write which will fail with EPIPE.

Fix this by treating EVFILT_READ with EV_EOF set as making both reads
and writes ready to proceed.

The real test for this is in CL 71770, which tests using various
timeouts with pipes.

Updates #22114

Change-Id: Ib23fbaaddbccd8eee77bdf18f27a7f0aa50e2742
Reviewed-on: https://go-review.googlesource.com/71973Reviewed-by: Matthew Dempsky <mdempsky@google.com>

Fixes #22342.

Change-Id: Ic942162e98dce5749e381a31d58b0bf16c7d6f98
Reviewed-on: https://go-review.googlesource.com/72132
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>

Since inlining budget calculation is fixed in CL 70151
runtime.nextFreeFast is no longer inlineable on MIPS64x because
it does not support Ctz64 as intrinsic. Skip the test.

Updates #22239.

Change-Id: Id00d55628ddb4b48d27aebfa10377a896765d569
Reviewed-on: https://go-review.googlesource.com/72271
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

This hack existed because cmd/go used to install (write) and then run
cmd/cgo in the same invocation, and writing and then running a program
is a no-no in modern multithreaded Unix programs (see #22315).

As of CL 68338, cmd/go no longer installs any programs that it then
tries to use. It never did this for any program other than cgo, and
CL 68338 removed that special case for cgo.

Now this special case, added for #3001 long ago, can be removed too.

Change-Id: I338f1f8665e9aca823e33ef7dda9d19f665e4281
Reviewed-on: https://go-review.googlesource.com/71571
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

build.go - commands and misc helpers
action.go - action graph construction
exec.go - action graph execution
gc.go - gc toolchain
gccgo.go - gccgo toolchain

Change-Id: I39b6e2490ac05334c2321e9ad88df694a6efa82f
Reviewed-on: https://go-review.googlesource.com/70671
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>

It uses the build ID, which is soon to be internal to package work.
Luckily it is also only called from package work.

Change-Id: I5e6662cfe667bdc9190f086be733105ad65a3191
Reviewed-on: https://go-review.googlesource.com/70670
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>