The documentation for TokenReader suggests that implementations of the
interface may return a token and io.EOF together, indicating that it is
the last token in the stream. This is similar to io.Reader. However, if
you wrap such a TokenReader in a Decoder it complained about the EOF.
A test was added to ensure this behavior on Decoder's.

Change-Id: I9083c91d9626180d3bcf5c069a017050f3c7c4a8
Reviewed-on: https://go-review.googlesource.com/c/go/+/130556
Run-TryBot: Sam Whited <sam@samwhited.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Updates #6239
Updates #27707

Change-Id: I0a62c1374db485dd830bf02e59625997d9247fc3
Reviewed-on: https://go-review.googlesource.com/c/go/+/203890
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fcntl can't be called using syscall.Syscall as it doesn't work on AIX.
Moreover, fcntl isn't exported by syscall package.

However, it can be accessed by exporting it from runtime package
using export_aix_test.go.

Change-Id: Ib6af66d9d7eacb9ca0525ebc4cd4c92951735f1a
Reviewed-on: https://go-review.googlesource.com/c/go/+/204059
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Change-Id: I2629711ce02d935130fb2aab29f9028b62ba9fe6
Reviewed-on: https://go-review.googlesource.com/c/go/+/204318
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

ENFILE is returned from accept when the whole system has run out of
file descriptors. Mark the error as temporary, so that accept loops
continue working.

Fixes #35131
Updates #1891

Change-Id: Idf44c084731898ff4c720d06c250d3b8a42de312
Reviewed-on: https://go-review.googlesource.com/c/go/+/203117
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

The flags -headerpad, -Wl,-no_pie and -pagezero_size are incompatible with
the -fembed-bitcode flag used by `gomobile build`. Than McIntosh
suggested we might not need the offending flags; this change removes
the flags on darwin/arm64 and -headerpad, -pagezero_size on darwin/arm.

The -Wl,-no_pie flag is left for darwin/arm because linking fails
without it:

ld: warning: PIE disabled. Absolute addressing (perhaps -mdynamic-no-pic) not allowed in code signed PIE, but used in _runtime.rodata from /var/folders/qq/qxn86k813bn9fjxydm095rxw0000gp/T/workdir-host-darwin-amd64-zenly-ios/tmp/go-link-225285265/go.o. To fix this warning, don't compile with -mdynamic-no-pic or link with -Wl,-no_pie

Discussion: https://groups.google.com/d/msg/golang-dev/U1jK3xmmGAk/j0_ty46EDAAJ

I've verified the CL on the builders, built the "flappy" example from
gomobile with `gomobile build`, and verified that flappy runs on an
iPhone 5S.

Updates #32963

Change-Id: I783abc93ccf3c1d2b7ca00144b7164ba223d3529
Reviewed-on: https://go-review.googlesource.com/c/go/+/201358Reviewed-by: Cherry Zhang <cherryyz@google.com>

Number literal strings returned by the lexer (internal/syntax package) and other
arguments to SetString never contain leading whitespace. There's no need (anymore)
to trim the argument.

Change-Id: Ib060d109f46f79a364a5c8aa33c4f625fe849264
Reviewed-on: https://go-review.googlesource.com/c/go/+/203997Reviewed-by: Robert Griesemer <gri@golang.org>

This fixes the Plan 9 support for the new timer code.

Updates #6239
Updates #27707

Change-Id: Ia498c399b8924910b97fcde07545fae3588aad47
Reviewed-on: https://go-review.googlesource.com/c/go/+/204045Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

The C fnctl takes all int parameters, so consistently use int32.
We already used int32 on Darwin.

Change-Id: I69a012145d012771d7308d705d133159fc1aceaa
Reviewed-on: https://go-review.googlesource.com/c/go/+/204101
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

On some platforms (currently ARM and ARM64), when calling into
VDSO we store the G to the gsignal stack, if there is one, so if
we receive a signal during VDSO we can find the G.

When an M exits, it frees the gsignal stack. But m.gsignal.stack
still points to that stack. When we call nanotime on this M, we
will write to the already freed gsignal stack, which is bad.
Prevent this by unlinking the freed stack from the M.

Should fix #35235.

Change-Id: I338b1fc8ec62aae036f38afaca3484687e11a40d
Reviewed-on: https://go-review.googlesource.com/c/go/+/204158
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

For a discussion, see the issue.

Fixes #35189.

Change-Id: I46c87a45bddf2ea8c33bc101d58880b7922e0f78
Reviewed-on: https://go-review.googlesource.com/c/go/+/204044Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

The rules for extracting the interface data word don't leave
the result typed correctly. If I do i.([1]*int)[0], the result
should have type *int, not [1]*int. Using (IData x) for the result
keeps the typing of the original top-level Value.

I don't think this would ever cause a real codegen bug, bug fixing it
at least makes the typing shown in ssa.html more consistent.

Change-Id: I239d821c394e58347639387981b0510d13b2f7b7
Reviewed-on: https://go-review.googlesource.com/c/go/+/204042
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

This change deletes several internal packages, replaces imports to
them with the equivalent golang.org/x/mod packages, updates x/mod, and
re-runs 'go mod vendor'.

Packages are replaced as follows:

cmd/go/internal/modfile → golang.org/x/mod/modfile
cmd/go/internal/module → golang.org/x/mod/module
cmd/go/internal/semver → golang.org/x/mod/semver
cmd/go/internal/sumdb → golang.org/x/mod/sumdb
cmd/go/internal/dirhash → golang.org/x/mod/sumdb/dirhash
cmd/go/internal/note → golang.org/x/mod/sumdb/note
cmd/go/internal/tlog → golang.org/x/mod/sumdb/tlog

Updates #31761
Fixes #34924

Change-Id: Ie3bf677bb0be49af969f654a0214243a6547eb57
Reviewed-on: https://go-review.googlesource.com/c/go/+/202698
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

In my experimentation, I had found that most non-SSAable expressions were
converted to autotmp variables during AST evaluation. However, this was not true
generally, as witnessed by issue #35213, which has a non-SSAable field reference
of a struct that is not converted to an autotmp. So, I fixed openDeferSave() to
handle non-SSAable nodes more generally, and make sure that these non-SSAable
expressions are not evaluated more than once (which could incorrectly repeat side
effects).

Fixes #35213

Change-Id: I8043d5576b455e94163599e930ca0275e550d594
Reviewed-on: https://go-review.googlesource.com/c/go/+/203888
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

This is a partial revert of CL 203218.

cmd/go/internal/modfile is about to be deleted and replaced with
golang.org/x/mod/modfile in CL 202698. cmd/internal/diff is not
visible from golang.org/x/mod/modfile, and it doesn't make sense to
extract it into a new package there.

Updates #31761

Change-Id: I3bbbc4cae81120020e1092c1138524729530b415
Reviewed-on: https://go-review.googlesource.com/c/go/+/204103
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

This is a follow-up on https://golang.org/cl/202581.

Updates #33649.

Change-Id: Ib078fed983792c5493bdbed6d33e21b86856894a
Reviewed-on: https://go-review.googlesource.com/c/go/+/204041
Run-TryBot: Robert Griesemer <gri@golang.org>
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>

Previously, we were using srcDir, which would apply the wrong module
dependencies (including the wrong 'replace' and 'exclude' directives)
when locating an import path within a module.

Fixes #34860

Change-Id: Ie59dcc2075a7b51ba40f7cd2f62dae27bf58c9b0
Reviewed-on: https://go-review.googlesource.com/c/go/+/203820Reviewed-by: Jay Conrod <jayconrod@google.com>

Updates #25911
Fixes #35220

Change-Id: Id063722d181a12d926801d2e5bb1a9becb463a90
Reviewed-on: https://go-review.googlesource.com/c/go/+/204040
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Also remove unused test hook.

Updates #35117

Change-Id: I6f05ba234fb09e4b44e77c1539c02d1aed49910a
Reviewed-on: https://go-review.googlesource.com/c/go/+/204060Reviewed-by: Bryan C. Mills <bcmills@google.com>

Netpoll must be always be initialized when TestNetpollBreak is launched.
However, when it is run in standalone, it won't be the case, so it must
be forced.

Updates: #27707

Change-Id: I28147f3834f3d6aca982c6a298feadc09b55f66e
Reviewed-on: https://go-review.googlesource.com/c/go/+/204058
Run-TryBot: Clément Chigot <clement.chigot%atos.net@gtempaccount.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

The connection count must only be decremented if the persistent
connection was also removed.

Fixes #34941

Change-Id: I5070717d5d9effec78016005fa4910593500c8cf
Reviewed-on: https://go-review.googlesource.com/c/go/+/202087Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

When compiling for GOARCH=386 GOOS=android, the compiler was attaching
R_TLS_LE relocations inappropriately -- as of Go 1.13 the TLS access
recipe for Android refers to a runtime symbol and no longer needs this
type of relocation (which was causing a crash when the linker tried to
process it).

Updates #29674.
Fixes #34788.

Change-Id: Ida01875011b524586597b1f7e273aa14e11815d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/200337
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Elias Naur <mail@eliasnaur.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

Change-Id: Ie6fc3e9789aea6e5949e66186db6f2b071b6fdff
Reviewed-on: https://go-review.googlesource.com/c/go/+/204037
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

CL 203284 added a compiler intrinsics from atomic Load8 and Store8 on
several architectures, but missed the lowering on MIPS. This CL fixes
that.

Updates #10958, #24543.

Change-Id: I82e88971554fe8c33ad2bf195a633c44b9ac4cf7
Reviewed-on: https://go-review.googlesource.com/c/go/+/203977
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

TestPreemptM doesn't test preemptM, it tests signalM. Rename it and
co-locate it with the other tests related to signals.

Change-Id: I7b95f2ba96530c49cfa8d5bf33282946b5f2d9af
Reviewed-on: https://go-review.googlesource.com/c/go/+/203891
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

TestPreemptM tests signal delivery using SIGUSR1, but (for unknown
reasons) SIGUSR1 is blocked by default on android/arm and
android/arm64, causing the test to fail.

This fixes the test by ensuring that SIGUSR1 is unblocked for this
test.

Updates #10958, #24543.

Change-Id: I9f81fbab53f96c74622aabcb6f5276f79e2b6d33
Reviewed-on: https://go-review.googlesource.com/c/go/+/203957
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

As suggested by comments from the review of CL 168478, this adds
Go code to do reverse bytes and removes the asm code, as well
as making a few cosmetic changes.

Change-Id: I08276a11222e03c3b42f4c9dc0d10a371a418be7
Reviewed-on: https://go-review.googlesource.com/c/go/+/203937
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Munday <mike.munday@ibm.com>

Mostly replaced [:x] slice operation with [:x:x]. 

According to @mdempsky, compiler specially recognizes when you combine
a pointer conversion with a full slice operation in a single expression
and makes an exception.

Updates golang/go#34972

Change-Id: I07d9de3b31da254d55f50d14c18155f8fc8f3ece
Reviewed-on: https://go-review.googlesource.com/c/go/+/203442Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>

n.Opt() is used in walkCheckPtrArithmetic to prevent infinite loops. The
fact that it's used today because n.Opt() is not used for OCONVNOP
during walk.go. If that changes, then it's not safe to repalce it
anymore. So doing hard fail if that case happens, the author of new
changes will be noticed and must change the usage of n.Opt() inside
walkCheckPtrArithmetic, too.

Change-Id: Ic7094baa1759c647fc10e82457c19026099a0d47
Reviewed-on: https://go-review.googlesource.com/c/go/+/202497
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

Windows uses '\' not '/'.

Fixes #35175.

Change-Id: Ib3d01dcf148fc0675496d5213f5bcc9cf210a6fc
Reviewed-on: https://go-review.googlesource.com/c/go/+/203889Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>

The asm encoder generally assumes that the lowest 5 bits of the
REG_XX constants match the machine instruction encoding, i.e.
the lowest 5 bits is the register number. This was not true for
FCR registers and M registers. Make it so.

MOV Rx, FCRy was encoded as two machine instructions. The first
is unnecessary. Remove.

Change-Id: Ib988e6b109ba8f564337cdd31019c1a6f1881f5b
Reviewed-on: https://go-review.googlesource.com/c/go/+/203717
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>

For #10958, #24543, but makes sense on its own.

Change-Id: I2a87dab66b82a1863e4b6512b1f8def51463ce2a
Reviewed-on: https://go-review.googlesource.com/c/go/+/203284
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

We already have Load8, And8, and Or8.

For #10958, #24543, but makes sense on its own.

Change-Id: I478529fc643edc57efdeccaae413c99edd19b2eb
Reviewed-on: https://go-review.googlesource.com/c/go/+/203283
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

Change-Id: Idac8473d1752059bf2f617fd7a781000ee2c3af4
GitHub-Last-Rev: 02a3aa1a3241d3ed4422518f1c954cd54bbe858e
GitHub-Pull-Request: golang/go#35141
Reviewed-on: https://go-review.googlesource.com/c/go/+/203218
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

"declared and not used" is technically correct, but might confuse
the user. Switching "and" to "but" will hopefully create the
contrast for the users: they did one thing (declaration), but
not the other --- actually using the variable.

This new message is still not ideal (specifically, declared is not
entirely precise here), but at least it matches the other parsers
and is one step in the right direction.

Change-Id: I725c7c663535f9ab9725c4b0bf35b4fa74b0eb20
Reviewed-on: https://go-review.googlesource.com/c/go/+/203282
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

This is a 2nd attempt at fixing CL 162337 which had an off-by-one error.
We were unconditionally getting the position of the start of the next line
from the last import without checking whether it is the end of the file or not.

Fix the code to check for that and move the testcase added in CL 190523
to the end of the file for it to trigger the issue properly.

Fixes #18929

Change-Id: I59e77256e256570b160fea6a17bce9ef49e810df
Reviewed-on: https://go-review.googlesource.com/c/go/+/190480
Run-TryBot: Agniva De Sarker <agniva.quicksilver@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

Allows Go asm calls referencing a function in a .syso file to be
passed through to the external linker, that would have otherwise
raised a "relocation target X not defined" error in cmd/link.

Fixes #33139

Change-Id: I2a8eb6063ebcd05fac96f141acf7652cf9189766
Reviewed-on: https://go-review.googlesource.com/c/go/+/198798
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Remove skipping of TestRemoveUnreadableDir on Windows.

Fixes #26295

Change-Id: I364a3caa55406c855ece807759f6298f7e4ddf1e
Reviewed-on: https://go-review.googlesource.com/c/go/+/203599
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

In the second step of make.bash, cmd/dist builds cmd/go by invoking
the compiler, linker, and other tools directly on transitive
dependencies of cmd/go. Essentially, cmd/dist acts as a minimal
version of 'go install' when building go_toolchain.

Until now, cmd/go has had no transitive dependencies in vendor
directories. This changes in CL 202698, where several packages are
deleted and equivalent versions in golang.org/x/mod are used
instead. So this CL adds support to cmd/dist for vendor directories.

Updates #31761

Change-Id: Iab4cdc7e505069a8df296287d16fbaa871944955
Reviewed-on: https://go-review.googlesource.com/c/go/+/203537
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

Correctly track whether the closing } of a block (or a function body)
is present or not in the AST and report correct End() positions in
each case.

There are more cases like this but this CL addresses an immediate
issue and sets a precedent for how to fix similar cases if a need
arises.

Fixes #33649.

Change-Id: Id6662ddaac09f3c15f8003edc9275fe2b0c41c78
Reviewed-on: https://go-review.googlesource.com/c/go/+/202581
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>