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37151 Commits

Author SHA1 Message Date
Rob Pike
12f217459d doc: update Implementation and Performance sections of the FAQ
Changes are mostly about making more about now than about the past,
changing some verb tenses, and mentioning gollvm (which should
be pronounced "gollum" if you ask me).

Update #26107

Change-Id: I6c14f42b9fc2684259d4ba8bc149d7ec9bb83d15
Reviewed-on: https://go-review.googlesource.com/123917
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-15 09:18:16 +00:00
Rob Pike
ca69a916ca doc: rearrange the description of GOMAXPROCS
The old text was written when it was only 1 by default, which
changed a long time ago.

Also add a note that GOMAXPROCS does not limit the total
number of threads.

Change-Id: I104ccd7266d11335320a4d7f5671fb09ed641f88
Reviewed-on: https://go-review.googlesource.com/123916
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-15 09:12:39 +00:00
Keith Randall
2598ed0758 misc/cgo: fix test on iOS
The test in CL 123715 doesn't work on iOS, it needs to use a different
version scheme to determine whether SecKeyAlgorithm and friends exist.
Restrict the old version test to OSX only.

The same problem occurs on iOS: the functions tested don't exist before
iOS 10.  But we don't have builders below iOS 10, so it isn't a big issue.
If we ever get older builders, or someone wants to run all.bash on an
old iOS, they'll need to figure out the right incantation.

Update #24161
Update #26355

Change-Id: Ia3ace86b00486dc172ed00c0c6d668a95565bff7
Reviewed-on: https://go-review.googlesource.com/123959
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-07-15 06:06:38 +00:00
Dan Kortschak
c2eba53e7f cmd/vet,sync: check lock values more precisely
Fixes #26165

Change-Id: I1f3bd193af9b6f8461c736330952b6e50d3e00d9
Reviewed-on: https://go-review.googlesource.com/121876
Reviewed-by: Alan Donovan <adonovan@google.com>
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-07-14 06:48:21 +00:00
Brad Fitzpatrick
00ebfcde7f net/http: don't cancel Request.Context on pipelined Server requests
See big comment in code.

Fixes #23921

Change-Id: I2dbd1acc2e9da07a71f9e0640aafe0c59a335627
Reviewed-on: https://go-review.googlesource.com/123875
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-13 23:44:42 +00:00
Adam Shannon
6f96cf2793 os/exec: document ExtraFiles is not supported on windows
Fixes #26182

Change-Id: I1181e191f4742f166c9b67a6f41332a237cf0ede
Reviewed-on: https://go-review.googlesource.com/123855
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-13 22:29:48 +00:00
Baokun Lee
00f32fbe7a cmd/go: fix module replace flag parsed bug
In CL 122404, we change -replace syntax from => to =.
And we also need to change this and the tests.

Fixes golang/go#26373.

Change-Id: I2d4e85e10c1578540cc7673b93d849270940d776
Reviewed-on: https://go-review.googlesource.com/123778
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
2018-07-13 22:06:20 +00:00
Brad Fitzpatrick
5e60479ba4 cmd/go: remove windows Skip in test that wasn't removed
Was supposed to be removed from CL 123757

Change-Id: I74405adab58be103f8e4a0c2405567f480a0e622
Reviewed-on: https://go-review.googlesource.com/123895
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2018-07-13 21:59:41 +00:00
Russ Cox
3239e9d3dc cmd/go: fix TestModFindModulePath on Windows
The os.RemoveAll(tg.tempdir) was not a good idea.

Change-Id: I6f78cff887044186649cbf3ee04a58abdbcb71e2
Reviewed-on: https://go-review.googlesource.com/123757
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2018-07-13 20:51:56 +00:00
Russ Cox
f50448f531 regexp: reword Match documentation to be more like Find
Before:

  // Find returns a slice holding the text of the leftmost match in b of the regular expression.

  // Match checks whether a textual regular expression matches a byte slice.

After:

  // Match reports whether the byte slice b contains any match of the regular expression re.

The use of different wording for Find and Match always makes me think
that Match required the entire string to match while Find clearly allows
a substring to match.

This CL makes the Match wording correspond more closely to Find,
to try to avoid that confusion.

Change-Id: I97fb82d5080d3246ee5cf52abf28d2a2296a5039
Reviewed-on: https://go-review.googlesource.com/123736
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-13 18:52:46 +00:00
Than McIntosh
204c618f0a cmd/link: eliminate a couple of unused DWARF attrs
The linker's DWARF generation occasionally computes and attaches an
attribute X to a type even though the type's abbrev doesn't have the
specified attr. For example, the DW_TAG_subroutine_type abbrev entry
has no type attribute, but a type attr is given to it (wasting
memory). Similarly there are some places where a byte size attr is
added to a DIE whose abbrev lacks that attr. This patch trims away a
few of these not-needed attrs, saving some very tiny amount of memory.

Updates #26186

Change-Id: I69e853df468ac54b07772a614b4106d7c4dae01d
Reviewed-on: https://go-review.googlesource.com/123296
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-07-13 18:37:29 +00:00
Ian Lance Taylor
ebdba42d9e runtime: check tgkill error in Debug tests
Updates #25519

Change-Id: Ibcdf948fd38d8d02d467b62213566ec0d7ce0d6a
Reviewed-on: https://go-review.googlesource.com/123180
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
2018-07-13 17:17:54 +00:00
Julien Salleyron
5201b1ad22 http/http/httputil: add ReverseProxy.ErrorHandler
This permits specifying an ErrorHandler to customize the RoundTrip
error handling if the backend fails to return a response.

Fixes #22700
Fixes #21255

Change-Id: I8879f0956e2472a07f584660afa10105ef23bf11
Reviewed-on: https://go-review.googlesource.com/77410
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-07-13 16:45:34 +00:00
Jakub Čajka
86a0e67a03 cmd/go: call flag.Parse to properly initialize test environment variables
Executing tests in src/cmd/go/internal/modfetch/codehost/git_test.go in enviroment
witout outside connectivity in to the internet results in tests failure:

2018/07/13 14:31:14 git clone --mirror https://vcs-test.golang.org/git/gitrepo1 /tmp/gitrepo-test-996701800/gitrepo2 in : exit status 128:
        Cloning into bare repository '/tmp/gitrepo-test-996701800/gitrepo2'...
        fatal: unable to access 'https://vcs-test.golang.org/git/gitrepo1/': Could not resolve host: vcs-test.golang.org
FAIL    cmd/go/internal/modfetch/codehost       0.307s

Fixes #26007

Change-Id: Ia39d8b3215c920dad6c0c58ffabb0b2ab39bb55c
Reviewed-on: https://go-review.googlesource.com/123735
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-07-13 16:41:10 +00:00
Johan Brandhorst
28502b5023 net/http: correct use of byte slice in js syscall
syscall/js does not allow []byte to be used in direct inputs to
its JavaScript manipulation methods since
bafe466a95.
Unfortunately, this use of a byte slice was missed, so any
uses of the WASM Roundtripper with a body will panic.
This ensures the byte slice is appropriately converted
before being passed to syscall.

Fixes #26349

Change-Id: I83847645d71ce310c1eee3decddbac990fae166b
GitHub-Last-Rev: 3914bda2ff
GitHub-Pull-Request: golang/go#26350
Reviewed-on: https://go-review.googlesource.com/123537
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Richard Musiol <neelance@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-07-13 14:52:22 +00:00
Dmitry Doroginin
05e02d77c3 cmd/go/internal/modload: more aggressive symlink analysis in FindModulePath
Fixes golang/go#26217.

Change-Id: I0c456047ee31aa78b72acc413446651ca8c3882a
GitHub-Last-Rev: b700554d883b43b57c6619e31a5f8fcb22b1d71f
GitHub-Pull-Request: golang/vgo#5
Reviewed-on: https://go-review.googlesource.com/123755
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2018-07-13 14:16:27 +00:00
Kunpei Sakai
8a330454dc net/url: don't escape sub-delims in fragment
According to RFC-3986, the sub-delims chars should not be escaped in
fragment.
So this change fixes current behavior a bit.

Fixes #19917

Change-Id: I1a8deb93255d979532f75bae183c3fb53a05d395
Reviewed-on: https://go-review.googlesource.com/61650
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-07-13 03:53:00 +00:00
Keith Randall
a2419221fd misc/cgo/test: fix issue 24161 test for 1.11 and earlier
The test uses functions from C that were introduced in OSX 1.12.
Include stubs for those functions when compiling for 1.11 and earlier.
This test really a compile-time test, it doesn't matter much what the
executed code actually does.
Use a nasty #define hack to work around the fact that cgo doesn't
support static global variables.

Update #24161
Fixes #26355

Change-Id: Icf6f7bc9b6b36cacc81d5d0e033a2ebaff7e0298
Reviewed-on: https://go-review.googlesource.com/123715
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-07-13 00:03:31 +00:00
Rob Pike
489a2632f4 doc: update Concurrency, Functions and Methods, and Control Flow sections
Many parts of the FAQ are dusty and need cleaning up.
This is the first of a series of changes to bring it up to date.
Since it was first written at the time of release, some of the
ideas and background have changed, and some historical
remarks are largely irrelevant now.

Update #26107.

Change-Id: I1f36df7d8ecc8a1a033d5ac4fa1edeece25ed6b4
Reviewed-on: https://go-review.googlesource.com/123496
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-12 22:49:31 +00:00
Rebecca Stambler
6f8e8e14c8 go/types: record type information after detecting error
The existing implementation stops recording type information once it
encounters an error. This results in missing type information that is
needed by various tools. This change handles a few commonly encountered
cases by continuing to check subtrees after errors. Also, add tests for
cases where the package fails to type-check.

Updates #22467

Change-Id: I1bb48d4cb8ae5548dca63bdd785ea2f69329e92b
Reviewed-on: https://go-review.googlesource.com/123578
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
2018-07-12 22:12:51 +00:00
Brad Fitzpatrick
71d2908648 net/http: update bundled http2
Updates bundled x/net/http2 to git rev d0887baf81f4 for:

    http2: ignore unknown 1xx responses like HTTP/1
    https://golang.org/cl/123615

    http2: fix bug in earlier CL 123615
    https://golang.org/cl/123675

Also along for the ride, but without any effect:

    http2: export a field of an internal type for use by net/http
    https://golang.org/cl/123656

Fixes #26189
Updates #17739

Change-Id: I1955d844d74113efbcbbdaa7d7a7faebb2225b45
Reviewed-on: https://go-review.googlesource.com/123676
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-12 21:49:56 +00:00
Russ Cox
24e5fae92e cmd/go: fix tests from x/vgo repo
This CL fixes up tests from the x/vgo repo that are failing
on some of the builders.
It will be submitted together with CL 123576.

Change-Id: I6bec81a93ad4f7116e8edc8c15beafa25747530c
Reviewed-on: https://go-review.googlesource.com/123580
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-07-12 20:46:52 +00:00
Russ Cox
f7248f0594 cmd/go: merge module support from x/vgo repo
This CL corresponds to CL 123361, the final manual CL in that repo,
making this the final manual sync.

All future commits will happen in this repo (the main Go repo),
and we'll update x/vgo automatically with a fixed patch+script.

Change-Id: I572243309c1809727604fd704705a23c30e85d1a
Reviewed-on: https://go-review.googlesource.com/123576
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2018-07-12 20:46:50 +00:00
Brad Fitzpatrick
f22dd66b23 net/http: make Transport.CloseIdleConnections close non-bundled http2.Transport
Previously Transport.CloseIdleConnections only closed the HTTP/2
Transport's idle connections if the HTTP/2 transport was configured
automatically via the bundled copy (in h2_bundle.go).

This makes it also work if the user called http2.ConfigureTransport
themselves using golang.org/x/net/http2 instead of the bundled copy.

No tests because we have no current way to run such cross-repo tests,
at least in any efficient or non-flaky way.

Tested by hand that:

    package main

    import (
        "net/http"

        "golang.org/x/net/http2"
    )

    func main() {
        tr := &http.Transport{}
        http2.ConfigureTransport(tr)
        tr.CloseIdleConnections()
    }

... now works and calls the x/net/http2.Transport.CloseIdleConnections
code. (I threw in a print statement locally)

Fixes #22891 once CL 123656 is also in.

Change-Id: Id697fd3e7877c3a988bc3c3368b88940ba56cfd0
Reviewed-on: https://go-review.googlesource.com/123657
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-12 20:05:15 +00:00
Keith Randall
b888a6227f cmd/cgo: fix cgo bad typedefs
Two fixes:

1) Typedefs of the bad typedefs should also not be rewritten to the
   underlying type.  They shouldn't just be uintptr, though, they should
   retain the C naming structure.  For example, in C:

   typedef const __CFString * CFStringRef;
   typedef CFStringRef SecKeyAlgorithm;

   we want the Go:

   type _Ctype_CFStringRef uintptr
   type _Ctype_SecKeyAlgorithm = _Ctype_CFStringRef

2) We need more types than just function arguments/return values.
   At least we need types of global variables, so when we see a reference to:

   extern const SecKeyAlgorithm kSecKeyAlgorithmECDSASignatureDigestX962SHA1;

   we know that we need to investigate the type SecKeyAlgorithm.
   Might as well just find every typedef and check the badness of all of them.
   This requires looping until a fixed point of known types is reached.
   Usually it takes just 2 iterations, sometimes 3.

Fixes #24161

Change-Id: I32ca7e48eb4d4133c6242e91d1879636f5224ea9
Reviewed-on: https://go-review.googlesource.com/123177
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-12 19:15:12 +00:00
Keith Randall
85cfa4d55e cmd/compile: handle degenerate write barrier case
If both branches of a write barrier test go to the same block,
then there's no unsafe points.

This can only happen if the resulting memory state is somehow dead,
which can only occur in degenerate cases, like infinite loops. No
point in cleaning up the useless branch in these situations.

Fixes #26024.

Change-Id: I93a7df9fdf2fc94c6c4b1fe61180dc4fd4a0871f
Reviewed-on: https://go-review.googlesource.com/123655
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-07-12 19:06:09 +00:00
David Chase
0029cd479e cmd/compile: add LocalAddr that takes SP,mem operands
Lack of a well-defined order between VarDef and related
address operations sometimes causes problems with store order
and write barrier transformations; glitches in the order are
made irreparable (by later optimizations) if the two parts of
the glitch straddle a split in the original block caused by
insertion of a write barrier diamond.

Fix this by creating a LocalAddr for addresses of locals
(what VarDef matters for) that takes a memory input to
help make the order explicit.  Addr is modified to only
be legal for SB operand, so there is no overlap between
Addr and LocalAddr uses (there may be some downstream
cleanup from this).

Changes to generic.rules and rewrite.go ensure that codegen
tests continue to pass; CSE of LocalAddr is impaired, not
quite sure of the cost.

Fixes #26105.

Change-Id: Id4192b4440aa4e9d7ba54a465c456df9b530b515
Reviewed-on: https://go-review.googlesource.com/122483
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
2018-07-12 18:45:31 +00:00
Russ Cox
bb364d49a9 cmd/go: delete TestGoBuildDashA*
The behavior of -a no longer changes depending on which kind
of branch of Go you are using (the new build cache fixed all that).
These tests are not doing anything useful (and failing).

Change-Id: I1c65120a3e05286e888951d61bca4a903e2c1158
Reviewed-on: https://go-review.googlesource.com/123575
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-07-12 17:30:14 +00:00
Brad Fitzpatrick
becd2a83c7 syscall: convert Windows AddrinfoW.Addr from uintptr to syscall.Pointer
API compatibility violation, but it wasn't safe before and people
should be using golang.org/x/sys/windows instead.

Fixes #24820

Change-Id: I3b43493f56b3116924b9d848a294899279f314fd
Reviewed-on: https://go-review.googlesource.com/123455
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-07-12 15:36:15 +00:00
Xia Bin
c19f86fbfb runtime: fix reference to funcdata.go in comment
Change-Id: I6c8699cd71b41cf8d178a0af3a745a19dcf60905
Reviewed-on: https://go-review.googlesource.com/123536
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-07-12 15:13:10 +00:00
Keith Rarick
33c7f88eaf time: fix typo in Truncate example
The existing example code uses variable name d, but
prints t in its output. It's needlessly confusing.

Change-Id: I67bef3c732e84d2d89819f96b4b62663630fd69e
Reviewed-on: https://go-review.googlesource.com/123516
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-07-12 15:01:16 +00:00
Brad Fitzpatrick
a7bcb5390d net/http: update bundled http2
Updates bundled x/net/http2 to git rev cffdcf67 for:

    http2: use GetBody unconditionally on Transport retry, when available
    https://golang.org/cl/123476

    http2: a closed stream cannot receive data
    https://golang.org/cl/111676

Updates #25009
Updates #25023

Change-Id: I84f50cc50c0fa5a3c34f0037a9cb1ef468e5f0d9
Reviewed-on: https://go-review.googlesource.com/123515
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-12 14:28:16 +00:00
Xia Bin
3df1f00bfc doc: ArgsSizeUnknown it's defined in cmd/internal/objabi now
Change-Id: I877c82788f3edbcb0b334b42049c1a06f36a6477
Reviewed-on: https://go-review.googlesource.com/123517
Reviewed-by: Rob Pike <r@golang.org>
2018-07-12 08:22:37 +00:00
Ian Lance Taylor
964c15f360 test: add test of valid code that gccgo failed to compile
Updates #26340

Change-Id: I3bc7cd544ea77df660bbda7de99a009b63d5be1b
Reviewed-on: https://go-review.googlesource.com/123477
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-07-12 05:29:12 +00:00
Brad Fitzpatrick
10d977d76b net/http: add tests to validate that Client.Timeout closes connections
For #23399

Change-Id: I9bc7c21fda6bfa89af2e7656e5c85aa9edd4f29e
Reviewed-on: https://go-review.googlesource.com/123435
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-12 05:07:44 +00:00
Rob Pike
d87f635626 doc: clarify a sentence about *_js.go
Change "have to" to "need to" for clarity and to avoid a
peculiar English idiom.

Change-Id: Iec2b1f841d0353dd7925f8f934fe82d4ed059d7d
Reviewed-on: https://go-review.googlesource.com/123495
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-12 04:33:03 +00:00
Matthew Dempsky
cc422e64d0 cmd/compile: fix ICE due to missing inline function body
For golang.org/cl/74110, I forgot that you can use range-based for
loops to extract key values from a map value.

This wasn't a problem for the binary format importer, because it was
more tolerant about missing inline function bodies. However, the
indexed importer is more particular about this.

We could potentially just make it more lenient like the binary
importer, but tweaking the logic here is easy enough and seems like
the preferable solution.

Fixes #26341.

Change-Id: I54564dcd0be60ea393f8a0f6954b7d3d61e96ee5
Reviewed-on: https://go-review.googlesource.com/123475
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
2018-07-12 00:13:37 +00:00
Russ Cox
6b89194c28 cmd/dist: enable build cache always
GOCACHE=off is not a reliable signal of user intent.

At startup the go command fills in an empty GOCACHE with the effective setting.
If $HOME is set, then GOCACHE ends up somewhere in $HOME/.cache.
But if $HOME is unset, then the go command sets GOCACHE=off explicitly.

That environment is used for invoking "go tool dist".

So if the machine has no $HOME, then go tool dist ends up with the cache
disabled even though the user was not trying to disable the cache.
This affects the linux-ppc64le builder, which appears to be unique
among builders in not having $HOME set. So that builder is running
with no build cache.

Now that there is a cmd/go test that needs the cache to be on,
the linux-ppc64le builder is failing.

In the next release we intend to force the use of the build cache
always. This CL is not doing that: it's only forcing the use of the
build cache during all.bash, which won't affect the majority of
our users (they run pre-build binary releases).

If this is a problem we can roll it back and fix the linux-ppc64le
builders some other way.

While we're here, print a few more useful variables in 'go tool dist env'
and sort the output.

Change-Id: I66548aa8990d0794cbc0f2069b739ab1834898dd
Reviewed-on: https://go-review.googlesource.com/123297
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>
2018-07-12 00:10:07 +00:00
Brad Fitzpatrick
40bc0a7709 doc: mention that *_js.go files are now ignored and treated like a GOOS
Fixes #26329

Change-Id: Id87fd106e69d3d9682653eb753b1de616adeed2b
Reviewed-on: https://go-review.googlesource.com/123416
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-11 22:09:15 +00:00
Caleb Martinez
a07ee41a33 time: add clarification to Timer.Stop documentation
Fixes #26220

Change-Id: I05703912be594d985ad3ccb3a9757ae21ec738ab
GitHub-Last-Rev: e4649847e0
GitHub-Pull-Request: golang/go#26293
Reviewed-on: https://go-review.googlesource.com/122715
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-11 22:06:22 +00:00
Brad Fitzpatrick
4b74506da1 doc: update the minimum support Windows version
Also, remove some test code that was trying to work on XP and fix up
some comments referencing XP.

Fixes #26191
Updates #23380

Change-Id: I0b7319fe1954afddb22d396e5ec91d8c960268d8
Reviewed-on: https://go-review.googlesource.com/123415
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-07-11 22:05:38 +00:00
Ian Lance Taylor
cda1947fd1 runtime: don't say "different packages" if they may not be different
Fix the panic message produced for an interface conversion error to
only say "types from different packages" if they are definitely from
different packges. If they may be from the same package, say "types
from different scopes."

Updates #18911
Fixes #26094

Change-Id: I0cea50ba31007d88e70c067b4680009ede69bab9
Reviewed-on: https://go-review.googlesource.com/123395
Reviewed-by: Austin Clements <austin@google.com>
2018-07-11 21:34:05 +00:00
Austin Clements
12ed0ddec1 cmd/link: use BestSpeed for DWARF compression
DWARF compression accounts for roughly 30% of the linker's time. This
CL switches from DefaultCompression to BestSpeed, which virtually
eliminates this time. This roughly halves the overhead of handling
DWARF in the linker:

name \ time/op         nodwarf     dwarf        dwarf-speed
BuildCmdGoAll          10.0s ±11%   10.6s ± 5%   10.8s ± 5%
             nodwarf                  +6.41%       +8.03%
               dwarf                                 ~
LinkCmdGo              626ms ± 5%  1096ms ± 2%   860ms ± 2%
             nodwarf                 +75.17%      +37.36%
               dwarf                              -21.59%

Previously, enabling DWARF had a 75% overhead in link time for cmd/go.
This change reduces this overhead to 37% (a 22% reduction).

The effect on binary size is minimal compared to DefaultCompression,
and still substantially better than no compression:

             cmd/go bytes
nodwarf      10106953
dwarf        12159049 nodwarf+20%
dwarf-speed  12408905 nodwarf+23%
dwarf-nozlib 17766473 nodwarf+76%

Updates #26318.

Change-Id: I33bb7caa038a2753c29104501663daf4839e7054
Reviewed-on: https://go-review.googlesource.com/123356
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
2018-07-11 20:23:02 +00:00
Austin Clements
9300d223a3 runtime: document philosophy behind runtime atomic usage
Based on Dmitry Vyukov's comments in CL 65210.

Change-Id: I5dce7286b0d180cd43cad3aaf70f537fafcda588
Reviewed-on: https://go-review.googlesource.com/123275
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
2018-07-11 20:21:32 +00:00
Brad Fitzpatrick
631402f142 net/http: fix rare Transport leak, remove incorrect defensive logic
Remove some incorrect code that was present after since I added
support for idle timeouts in CL 22670.

This code actually caused a bug (a rare goroutine leak) rather than
prevent a bogus connection reuse.

The t.idleMu mutex already protects most the invariants, including an
explicit Stop call. There's only one Stop call on that timer, and it's
guarded by t.idleMu. What idleMu doesn't protect against is the timer
firing on its own. But we don't need code to protect against that case
because the goroutine that is created via AfterFunc when the timer
fires already checks the invariants:

  // closeConnIfStillIdle closes the connection if it's still sitting idle.
  // This is what's called by the persistConn's idleTimer, and is run in its
  // own goroutine.
  func (pc *persistConn) closeConnIfStillIdle() {
     t := pc.t
     t.idleMu.Lock()
     defer t.idleMu.Unlock()
     if _, ok := t.idleLRU.m[pc]; !ok {
       // Not idle.
       return
     }

(note the "Not idle." part).

Tested by hand with the repro code from #25621. No more leaks.

Fixes #25621

Change-Id: Idf011a4cb1fcd01f55a5a6269e4c0ee5f4446786
Reviewed-on: https://go-review.googlesource.com/123315
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-11 19:20:39 +00:00
Ian Lance Taylor
787ff17dea test: add test case that failed with gccgo
Updates #26335

Change-Id: Ibfb1e232a0c66fa699842c8908ae5ff0f5d2177d
Reviewed-on: https://go-review.googlesource.com/123316
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-07-11 18:14:35 +00:00
Joel Sing
8ec35ab66a runtime: correct new thread stack for openbsd MAP_STACK
OpenBSD 6.4 will require the stack pointer to be pointing at an area that is
marked as MAP_STACK when entering and exiting syscalls. Adjust the stack pointer
used for a new thread such that it points within the stack, not at the top of
it (i.e. outside).

Fixes #26142

Change-Id: I905bd8e5be3dfc325392e7ac490fb56a7c71b3aa
Reviewed-on: https://go-review.googlesource.com/122735
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-07-11 17:58:23 +00:00
Richard Musiol
6fe7b43416 misc/wasm: free up memory on exit
Private fields of the Go class are not used any more after the program
has exited. Delete them to allow JavaScript's garbage collection to
clean up the WebAssembly instance.

Updates #26193.

Change-Id: I349784a49eaad0c22ceedd4f859df97132775537
Reviewed-on: https://go-review.googlesource.com/122296
Run-TryBot: Richard Musiol <neelance@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Paul Jolly <paul@myitcv.org.uk>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-07-11 10:22:17 +00:00
Hana (Hyang-Ah) Kim
5e70b132c2 cmd/pprof: disable readline UI support for TERM=dumb
In general, dumb terminal indicates terminal with limited capability.
It may provide no support for special character sequences, e.g., no
handling of ANSI escape sequences. Its input/output handling behavior
may deviate from what's described in termios or terminfo. E.g., in
the shell in emacs, even after successfully setting the terminal to
raw mode, the terminal behaves as if it's still operating in canonical
mode since emacs is doing input processing first.

Readline support can be broken in various ways in dumb terminal mode,
so we want to disable readline or advanced UI features. The easiest
way to detect dumb terminal is to check the environment variable "TERM".

Fixes #26254

Change-Id: I6b652eb555bc03b84405aae08b0b25d111fbb8b0
Reviewed-on: https://go-review.googlesource.com/122879
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-07-11 01:08:56 +00:00
Ian Lance Taylor
8d6fc84986 internal/poll: don't take read lock in SetBlocking
Taking a read lock in SetBlocking could cause SetBlocking to block
waiting for a Read in another goroutine to complete. Since SetBlocking
is called by os.(*File).Fd, that could lead to deadlock if the
goroutine calling Fd is going to use it to unblock the Read.
Use an atomic store instead.

Updates #24481

Change-Id: I79413328e06ddf28b6d5b8af7a0e29d5b4e1e6ff
Reviewed-on: https://go-review.googlesource.com/123176
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-07-11 00:34:18 +00:00