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45988 Commits

Author SHA1 Message Date
Russ Cox
0575e35e50 cmd/compile: require 'go 1.16' go.mod line for //go:embed
This will produce better errors when earlier versions of
Go compile code using //go:embed. (The import will cause
a compilation error but then the go command will add to
the output that the Go toolchain in use looks too old
and maybe that's the problem.)

This CL also adds a test for disallowing embed of a var inside a func.
It's a bit too difficult to rebase down into that CL.

The build system configuration check is delayed in order to
make it possible to use errorcheck for these tests.

Change-Id: I12ece4ff2d8d53380b63f54866e8f3497657d54c
Reviewed-on: https://go-review.googlesource.com/c/go/+/282718
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-01-19 20:07:52 +00:00
Cherry Zhang
ccb2e90688 cmd/link: exit before Asmb2 if error
If there are already errors emitted, don't run the Asmb2 pass
and just exit. At the point of Asmb2 relocations are already
resolved and errors should have been reported, if any. Asmb2 is
unlikely to emit additional useful users errors. Instead, the
invalid input may cause inconsistencies and crash the linker, or
it may emit some internal errors which are more confusing than
helpful. Exit on error before Asmb2.

Fixes #43748.

Change-Id: Icf6e27f2eef5b6259e921ec0e64bebad5dd805f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/284576
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
2021-01-19 17:33:33 +00:00
Jay Conrod
ca5774a5a5 embed: treat uninitialized FS as empty
As described in the FS documentation.

This prevents http.FS and other clients from panicking when the
go:embed directive is missing.

For #43682
Related #43698

Change-Id: Iecf26d229a099e55d24670c3119cd6c6d17ecc6e
Reviewed-on: https://go-review.googlesource.com/c/go/+/283852
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-01-19 16:31:09 +00:00
Joel Sing
d047c91a6c cmd/link,runtime: switch openbsd/amd64 to pthreads
This switches openbsd/amd64 to thread creation via pthreads, rather than doing
direct system calls.

Update #36435

Change-Id: I1105d5c392aa3e4c445d99c8cb80b927712e3529
Reviewed-on: https://go-review.googlesource.com/c/go/+/250180
Trust: Joel Sing <joel@sing.id.au>
Run-TryBot: Joel Sing <joel@sing.id.au>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2021-01-19 12:49:13 +00:00
Joel Sing
61debffd97 runtime: factor out usesLibcall
Rather than inline lists of GOOS values, factor out the code that checks
if a runtime makes system calls via libcall.

Change-Id: Ib19d7e63a2b4b8314f1841c0ff26e1b3a16b4b22
Reviewed-on: https://go-review.googlesource.com/c/go/+/259239
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
TryBot-Result: Go Bot <gobot@golang.org>
2021-01-19 12:48:38 +00:00
Joel Sing
9fed39d281 runtime: factor out mStackIsSystemAllocated
Rather than repeat long lists of GOOS values, factor out the code that checks
if a runtime starts on a system allocated stack. Note that this adds aix to
one case, which appears to have been previously missed.

Change-Id: I5cecb0bb47dd79cde8d723e5a42ba541e43cbfff
Reviewed-on: https://go-review.googlesource.com/c/go/+/250179
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
TryBot-Result: Go Bot <gobot@golang.org>
2021-01-19 12:07:43 +00:00
Jason A. Donenfeld
dbab079835 runtime: free Windows event handles after last lock is dropped
Calls to lock may need to use global members of mOS that also need to be
cleaned up before the thread exits. Before this commit, these resources
would leak. Moving them to be cleaned up in unminit, however, would race
with gstack on unix. So this creates a new helper, mdestroy, to release
resources that must be destroyed only after locks are no longer
required. We also move highResTimer lifetime to the same semantics,
since it doesn't help to constantly acquire and release the timer object
during dropm.

Updates #43720.

Change-Id: Ib3f598f3fda1b2bbcb608099616fa4f85bc1c289
Reviewed-on: https://go-review.googlesource.com/c/go/+/284137
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
2021-01-18 18:16:12 +00:00
Jason A. Donenfeld
5a8fbb0d2d os: do not close syscall.Stdin in TestReadStdin
By calling NewConsoleFile on syscall.Stdin, we wind up closing it when
the function returns, which causes errors when all the tests are run in
a loop. To fix this, we instead create a duplicate handle of stdin.

Fixes #43720.

Change-Id: Ie6426e6306c7e1e39601794f4ff48bbf2fe67502
Reviewed-on: https://go-review.googlesource.com/c/go/+/284140
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
2021-01-18 17:21:53 +00:00
Jason A. Donenfeld
682a1d2176 runtime: detect errors in DuplicateHandle
These functions rely on DuplicateHandle succeeding, but they don't check
the return value, which might be masking subtle bugs that cause other
problems down the line.

Updates #43720.

Change-Id: I77f0e6645affa534777ffc173144a52e4afa5f81
Reviewed-on: https://go-review.googlesource.com/c/go/+/284135
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Austin Clements <austin@google.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
2021-01-15 23:38:58 +00:00
Dmitri Shuralyov
9f83418b83 cmd/link: remove GOROOT write in TestBuildForTvOS
Tests should avoid writing to GOROOT when possible. Such writes
would fail if GOROOT is non-writeable, and it can interfere with
other tests that don't expect GOROOT to change during test execution.

Updates #28387.

Change-Id: I7d72614f218df3375540f5c2f9c9f8c11034f602
Reviewed-on: https://go-review.googlesource.com/c/go/+/284293
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-01-15 21:46:25 +00:00
Russ Cox
ec9470162f cmd/compile: allow embed into any string or byte slice type
The current implementation requires saying "string" or "[]byte"
and disallows aliases, defined types, and even "[]uint8".
This was not 100% intended and mostly just fell out of when
the checks were being done in the implementation (too early,
before typechecking).

After discussion on #43217 (forked into #43602),
the consensus was to allow all string and byte slice types,
same as we do for string conversions in the language itself.
This CL does that.

It's more code than you'd expect because the decision has
to be delayed until after typechecking.

But it also more closely aligns with the version that's
already on dev.regabi.

Fixes #43602.

Change-Id: Iba919cfadfbd5d7116f2bf47e2512fb1d5c36731
Reviewed-on: https://go-review.googlesource.com/c/go/+/282715
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
2021-01-15 20:37:59 +00:00
Russ Cox
54198b04db cmd/compile: disallow embed of var inside func
Allowing embedding into []byte inside a func creates an
unfortunate problem: either all calls start with the same
underlying data and can see each other's changes to the
underlying data (surprising and racy!) or all calls start
by making their own copy of the underlying data
(surprising and expensive!).

After discussion on #43216, the consensus was to remove
support for all vars embedded inside functions.

Fixes #43216.


Change-Id: I01e62b5f0dcd9e8566c6d2286218e97803f54704
Reviewed-on: https://go-review.googlesource.com/c/go/+/282714
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
2021-01-15 20:37:17 +00:00
Russ Cox
b386c735e7 cmd/go: fix go generate docs
The docs were never updated for the change to the placement
of the DO NOT EDIT line.

Also, the description of the DO NOT EDIT line interrupted the
description of the //go:generate line, which made for some
confusing references in the text that followed. Move it lower.

Fixes #41196.

Change-Id: I6af2a199fa98d45f5ccac7cdf7e9e54257699e61
Reviewed-on: https://go-review.googlesource.com/c/go/+/283633
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2021-01-15 20:36:53 +00:00
Jason A. Donenfeld
bb5075a525 syscall: remove RtlGenRandom and move it into internal/syscall
There's on need to expose this to the frozen syscall package, and it
also doesn't need to be unsafe. So we move it into internal/syscall and
have the generator make a safer function signature.

Fixes #43704.

Change-Id: Iccae69dc273a0aa97ee6846eb537f1dc1412f2de
Reviewed-on: https://go-review.googlesource.com/c/go/+/283992
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
2021-01-15 18:42:27 +00:00
Bryan C. Mills
1deae0b597 os: invoke processKiller synchronously in testKillProcess
Previously, testKillProcess needlessly invoked processKiller in a
separate goroutine and failed to wait for that goroutine to complete,
causing the calls to t.Fatalf in that goroutine to potentially occur
after the test function had already returned.

Fixes #43722

Change-Id: I5d03cb24af51bb73f0ff96419dac57ec39776967
Reviewed-on: https://go-review.googlesource.com/c/go/+/284153
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
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2021-01-15 18:29:43 +00:00
Filippo Valsorda
ff196c3e84 crypto/x509: update iOS bundled roots to version 55188.40.9
Updates #38843

Change-Id: If76844e1caf23f98d814de89f77610de59d96a34
Reviewed-on: https://go-review.googlesource.com/c/go/+/284134
Trust: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
2021-01-15 15:33:02 +00:00
Jay Conrod
e125ccd10e cmd/go: in 'go mod edit', validate versions given to -retract and -exclude
Fixes #43280

Change-Id: Icb6c6807fe32a89202a2709d4a1c8d8af967628f
Reviewed-on: https://go-review.googlesource.com/c/go/+/283853
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-01-14 22:01:23 +00:00
Cherry Zhang
eb330020dc cmd/dist, cmd/go: pass -arch for C compilation on Darwin
On Apple Silicon Mac, the C compiler has an annoying default
target selection, depending on the ancestor processes'
architecture. In particular, if the shell or IDE is x86, when
running "go build" even with a native ARM64 Go toolchain, the C
compiler defaults to x86, causing build failures. We pass "-arch"
flag explicitly to avoid this situation.

Fixes #43692.
Fixes #43476.
Updates golang/vscode-go#1087.

Change-Id: I80b6a116a114e11e273c6886e377a1cc969fa3f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/283812
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-01-14 21:55:29 +00:00
Quim Muntal
84e8a06f62 cmd/cgo: remove unnecessary space in cgo export header
The cgo header has an unnecessary space in the exported function
definition on non-windows goos.

This was introduced in go1.16 so it would be good to fix it before
release.

Example:

// Current behavior, notice there is an unecessary space
// between extern and void
extern  void Foo();

// With this CL
extern void Foo();

Change-Id: Ic2c21f8d806fe35a7be7183dbfe35ac605b6e4f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/283892
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Katie Hockman <katie@golang.org>
2021-01-14 21:49:46 +00:00
Ian Lance Taylor
0c86b999c3 cmd/test2json: document passing -test.paniconexit0
For #29062
Fixes #43263

Change-Id: I160197c94cc4f936967cc22c82cec01663a14fe6
Reviewed-on: https://go-review.googlesource.com/c/go/+/283873
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
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2021-01-14 20:38:03 +00:00
Jay Conrod
9135795891 cmd/go/internal/load: report positions for embed errors
Fixes #43469
Fixes #43632

Change-Id: I862bb9da8bc3e4f15635bc33fd7cb5f12b917d71
Reviewed-on: https://go-review.googlesource.com/c/go/+/283638
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Jay Conrod <jayconrod@google.com>
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2021-01-14 17:42:00 +00:00
Junchen Li
d9b79e53bb cmd/compile: fix wrong complement for arm64 floating-point comparisons
Consider the following example,

  func test(a, b float64, x uint64) uint64 {
    if a < b {
      x = 0
    }
    return x
  }

  func main() {
    fmt.Println(test(1, math.NaN(), 123))
  }

The output is 0, but the expectation is 123.

This is because the rewrite rule

  (CSEL [cc] (MOVDconst [0]) y flag) => (CSEL0 [arm64Negate(cc)] y flag)

converts

  FCMP NaN, 1
  CSEL MI, 0, 123, R0 // if 1 < NaN then R0 = 0 else R0 = 123

to

  FCMP NaN, 1
  CSEL GE, 123, 0, R0 // if 1 >= NaN then R0 = 123 else R0 = 0

But both 1 < NaN and 1 >= NaN are false. So the output is 0, not 123.

The root cause is arm64Negate not handle negation of floating comparison
correctly. According to the ARM manual, the meaning of MI, GE, and PL
are

  MI: Less than
  GE: Greater than or equal to
  PL: Greater than, equal to, or unordered

Because NaN cannot be compared with other numbers, the result of such
comparison is unordered. So when NaN is involved, unlike integer, the
result of !(a < b) is not a >= b, it is a >= b || a is NaN || b is NaN.
This is exactly what PL means. We add NotLessThanF to represent PL. Then
the negation of LessThanF is NotLessThanF rather than GreaterEqualF. The
same reason for the other floating comparison operations.

Fixes #43619

Change-Id: Ia511b0027ad067436bace9fbfd261dbeaae01bcd
Reviewed-on: https://go-review.googlesource.com/c/go/+/283572
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Keith Randall <khr@golang.org>
2021-01-14 17:23:11 +00:00
Jay Conrod
c73232d08f cmd/go/internal/load: refactor setErrorPos to PackageError.setPos
Renamed setErrorPos to setPos, made it a method of PackageError,
and removed its Package parameter and return value. This makes it
more clear that setPos modifies PackageError and does not create a new
Package.

Change-Id: I26c58d3d456c7c18a5c2598e1e8e158b1e6b4b36
Reviewed-on: https://go-review.googlesource.com/c/go/+/283637
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-01-14 16:50:30 +00:00
Jay Conrod
6aa28d3e06 go/build: report positions for go:embed directives
For #43469
For #43632

Change-Id: I9ac2da690344935da0e1dbe00b134dfcee65ec8a
Reviewed-on: https://go-review.googlesource.com/c/go/+/283636
Run-TryBot: Jay Conrod <jayconrod@google.com>
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Trust: Jay Conrod <jayconrod@google.com>
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2021-01-14 16:50:23 +00:00
Jay Conrod
7eb31d999c cmd/go: add hints to more missing sum error messages
When a command fails due to a module zip sum missing from go.sum,
if the module is in the build list, the go command will print a
'go mod download' command the user can run to fix it.

Previously, a hint was only printed if the module provided a package
in 'all'. We don't print a 'go get' hint, since we may not want to add
a new requirement to go.mod.

Fixes #43572

Change-Id: I88c61b1b42ad56c04e4482f6a1bb97ce758aaeff
Reviewed-on: https://go-review.googlesource.com/c/go/+/282712
Run-TryBot: Jay Conrod <jayconrod@google.com>
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2021-01-13 23:37:31 +00:00
Bryan C. Mills
ba76567bc2 cmd/go/internal/modload: delete unused *mvsReqs.next method
For #36460
Updates #36465

Change-Id: Id818dce21d39a48cf5fc9c015b30497dce9cd1ef
Reviewed-on: https://go-review.googlesource.com/c/go/+/278596
Trust: Bryan C. Mills <bcmills@google.com>
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TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
2021-01-12 21:39:59 +00:00
Eric Chiang
665def2c11 encoding/asn1: document unmarshaling behavior for IMPLICIT string fields
Fixes #42570.

Change-Id: I73e339cdebe1720c141861a12e28a94cef13c75b
Reviewed-on: https://go-review.googlesource.com/c/go/+/269798
Reviewed-by: Katie Hockman <katie@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
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Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Katie Hockman <katie@golang.org>
2021-01-12 18:32:48 +00:00
Jakub Warczarek
81ea89adf3 cmd/go: fix non-script staleness checks interacting badly with GOFLAGS
Fixes #43012.

Change-Id: Idc7a64b53c411e6dadd98521a48e15e664737d42
GitHub-Last-Rev: b56c0880c3
GitHub-Pull-Request: golang/go#43155
Reviewed-on: https://go-review.googlesource.com/c/go/+/277453
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
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2021-01-11 21:34:46 +00:00
Rebecca Stambler
759309029f doc: update editors.html for Go 1.16
Rerank editor plugins based on popularity (Go 2019 survey), and remove
Atom, as it is no longer popular.

Change-Id: I06d39b67eec24a920439b9ea1198b6e2a939874e
Reviewed-on: https://go-review.googlesource.com/c/go/+/283073
Trust: Rebecca Stambler <rstambler@golang.org>
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
2021-01-11 19:45:02 +00:00
Cherry Zhang
c3b4c7093a cmd/internal/objfile: don't require runtime.symtab symbol for XCOFF
For some reason (that I didn't look into), externally linked
AIX binaries don't have runtime.symtab symbol. Since recent Go
releases (Go 1.3 maybe?), that symbol is empty and not necessary
anyway. Don't require it.

Fixes #40972.

Change-Id: I73a1f0142195ea6debdba8a4f6e12cadc3980dc5
Reviewed-on: https://go-review.googlesource.com/c/go/+/279995
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
2021-01-11 18:19:08 +00:00
Jay Conrod
59bfc18e34 cmd/go: add hint to read 'go help vcs' to GOVCS errors
Fixes #43596

Change-Id: Iff925d077b5de64161e88c9471402bc7e8885fcd
Reviewed-on: https://go-review.googlesource.com/c/go/+/282713
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-01-08 22:55:41 +00:00
Jay Conrod
cd6f3a54e4 cmd/go: revise 'go help' documentation for modules
Module-related help pages now contain a brief summary and point to the
reference documentation at golang.org/ref/mod for details.

Help pages for commands like 'go get' still describe the basic usage
and summarize flags but don't provide as much background detail.

Fixes #41427
Fixes #43419

Change-Id: Icacd38e0f33c352c447cc5a496c99674493abde2
Reviewed-on: https://go-review.googlesource.com/c/go/+/282615
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-01-08 20:21:06 +00:00
Jay Conrod
6192b98751 cmd/go: make hints in error messages more consistent
* All commands the user can run to fix the problem now appear alone on
  a separate line after a tab.
* Removed -d from 'go get' commands.
* Replaced 'go mod tidy' with 'go mod download $modpath' when a
  package might be provided by a module missing a sum.
* Errors about 'path@version' syntax are more explicit.

Fixes #29415
Fixes #42087
Fixes #43430
Fixes #43523

Change-Id: I4427c2c4506a727a2c727d652fd2d506bb134d3b
Reviewed-on: https://go-review.googlesource.com/c/go/+/282121
Trust: Jay Conrod <jayconrod@google.com>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
2021-01-08 20:19:51 +00:00
Jay Conrod
25886cf4bd cmd/go: preserve sums for indirect deps fetched by 'go mod download'
Previously, commands that wrote go.sum (except 'go mod tidy') would
retain sums for zip files of directly required modules. Sums of
indirect dependencies wouldn't be retained unless they were used to
load packages.

With this change, sums for indirect dependencies will be retained if
they're available. This allows users to add missing sums with
'go mod download example.com/mod', which previously only worked for
directly required modules.

Note that 'go mod download' without arguments now adds sums for every
module in the build list. That matches 1.15 behavior.

For #41103

Change-Id: I4cce2bf1c73578dae836bdb5adb32da071554f1a
Reviewed-on: https://go-review.googlesource.com/c/go/+/282692
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2021-01-08 19:48:42 +00:00
Michael Anthony Knyszek
6250833911 runtime/metrics: mark histogram metrics as cumulative
All the current histogram metrics accumulate counts from program start
to infinity, and can be reasonably used to compute rates (also to
generate windowed distributions).

Change-Id: I5196c59867de34fba41bb8552606fa315460cef9
Reviewed-on: https://go-review.googlesource.com/c/go/+/282633
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2021-01-08 18:15:53 +00:00
Michael Anthony Knyszek
8f6a9acbb3 runtime/metrics: remove unused StopTheWorld Description field
This change removes the as-of-yet unused StopTheWorld field in the
Description struct. Adding a new field to a struct is much easier than
removing it, so let's save it for when we actually need it.

Change-Id: I8074b8569187c1a148500575fa8a661534e875d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/282632
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Reviewed-by: Austin Clements <austin@google.com>
2021-01-08 18:15:43 +00:00
Russ Cox
6598c65646 cmd/compile: fix exponential-time init-cycle reporting
I have a real 7,000-line Go program (not so big)
that took over two minutes to report a trivial init cycle.
I thought the compiler was in an infinite loop but
it was actually just very slow.

CL 170062 rewrote init cycle reporting but replaced
a linear-time algorithm with an exponential one:
it explores all paths through the call graph of functions
involved in the cycle.

The net effect was that  Go 1.12 took 0.25 seconds to load,
typecheck, and then diagnose the cycle in my program,
while Go 1.13 takes 600X longer.

This CL makes the new reporting code run in linear time,
restoring the speed of Go 1.12 but preserving the semantic
fixes from CL 170062.

Change-Id: I7d6dc95676d577d9b96f5953b516a64db93249bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/282314
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2021-01-08 17:14:20 +00:00
Russ Cox
fefad1dc85 test: fix timeout code for invoking compiler
When running go tool compile,
go tool is running compile as a subprocess.
Killing go tool with Process.Kill leaves the subprocess behind.
Send an interrupt signal first, which it can forward on
to the compile subprocess.

Also report the timeout in errorcheck -t.

Change-Id: I7ae0029bbe543ed7e60e0fea790dd0739d10bcaa
Reviewed-on: https://go-review.googlesource.com/c/go/+/282313
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2021-01-08 17:14:00 +00:00
Russ Cox
6728118e0a cmd/go: pass signals forward during "go tool"
This way, if a SIGINT is sent to the go command,
it is forwarded on to the underlying tool.

Otherwise trying to use os.Process.Signal to kill
"go tool compile" only kills the "go tool" not the "compile".

Change-Id: Iac7cd4f06096469f5e76164df813a379c0da3822
Reviewed-on: https://go-review.googlesource.com/c/go/+/282312
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2021-01-08 17:13:48 +00:00
Russ Cox
e65c543f3c go/build/constraint: add parser for build tag constraint expressions
This package implements a parser for the new //go:build constraint lines.
The parser also handles // +build lines, to be able to process legacy files.

This will not be used in the standard library until Go 1.17,
but it seems worth publishing in Go 1.16 so that code that
needs to process both kinds of lines once Go 1.17 comes out
will be able to build using Go 1.16 as well.

For #41184. Design in https://golang.org/design/draft-gobuild.

Change-Id: I756c0de4081c5039e8b7397200e5274f223ab111
Reviewed-on: https://go-review.googlesource.com/c/go/+/240604
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2021-01-08 17:08:44 +00:00
Austin Clements
0c5afc4fb7 testing/fstest,os: clarify racy behavior of TestFS
The testing.TestFS function assumes that the file system it's testing
doesn't change under it. Clarify this in the documentation and fix the
use of os.TestDirFS that's currently susceptible to this race.

Fixes #42637.

Change-Id: Ia7792380726177f8953d150ee87381b66cb01cb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/282452
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2021-01-08 16:34:00 +00:00
Michael Anthony Knyszek
32afcc9436 runtime/metrics: change unit on *-by-size metrics to match bucket unit
This change modifies the *-by-size metrics' units to be based off the
bucket's unit (bytes) as opposed to the unit of the counts (objects).
This convention is more in-line with distributions in other metrics
systems.

Change-Id: Id3b68a09f52f0e1ff9f4346f613ae1cbd9f52f73
Reviewed-on: https://go-review.googlesource.com/c/go/+/282352
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2021-01-08 16:28:15 +00:00
Ian Lance Taylor
c6513bca5a io/fs: minor corrections to Glob doc
The documentation for Glob was copied from filepath.Glob, and needs a bit
of tweaking: paths are not rooted at slash; the separator is always '/'.

Fixes #43537

Change-Id: Id64daa137e2762b66a82a5b9e60bbe603f4e2f5c
Reviewed-on: https://go-review.googlesource.com/c/go/+/282173
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2021-01-08 15:41:36 +00:00
Keith Randall
304f769ffc cmd/compile: don't short-circuit copies whose source is volatile
Current optimization: When we copy a->b and then b->c, we might as well
copy a->c instead of b->c (then b might be dead and go away).

*Except* if a is a volatile location (might be clobbered by a call).
In that case, we really do want to copy a immediately, because there
might be a call before we can do the a->c copy.

User calls can't happen in between, because the rule matches up the
memory states. But calls inserted for memory barriers, particularly
runtime.typedmemmove, can.

(I guess we could introduce a register-calling-convention version
of runtime.typedmemmove, but that seems a bigger change than this one.)

Fixes #43570

Change-Id: Ifa518bb1a6f3a8dd46c352d4fd54ea9713b3eb1a
Reviewed-on: https://go-review.googlesource.com/c/go/+/282492
Trust: Keith Randall <khr@golang.org>
Trust: Josh Bleecher Snyder <josharian@gmail.com>
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2021-01-08 05:00:06 +00:00
Michael Anthony Knyszek
ae97717133 runtime,runtime/metrics: use explicit histogram boundaries
This change modifies the semantics of
runtime/metrics.Float64Histogram.Buckets to remove implicit buckets to
that extend to positive and negative infinity and instead defines all
bucket boundaries as explicitly listed.

Bucket boundaries remain the same as before except
/gc/heap/allocs-by-size:objects and /gc/heap/frees-by-size:objects no
longer have a bucket that extends to negative infinity.

This change simplifies the Float64Histogram API, making it both easier
to understand and easier to use.

Also, add a test for allocs-by-size and frees-by-size that checks them
against MemStats.

Fixes #43443.

Change-Id: I5620f15bd084562dadf288f733c4a8cace21910c
Reviewed-on: https://go-review.googlesource.com/c/go/+/281238
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2021-01-08 03:43:44 +00:00
Meng Zhuo
a9ccd2d795 go/build: skip string literal while findEmbed
The findEmbed function looking for comment by readbyte,
however it might have constant or variables that contains
comment.
Maybe we should use ast parser in the future.

Fixes #43373

Change-Id: I92544384fc4c11363d8b2f6b9898c8dea1602767
Reviewed-on: https://go-review.googlesource.com/c/go/+/280332
Trust: Matthew Dempsky <mdempsky@google.com>
Trust: Meng Zhuo <mzh@golangcn.org>
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2021-01-08 02:18:40 +00:00
yangwenmai
d92f8add32 archive/tar: fix typo in comment
Change-Id: Ifcc565b34b3c3bb7ee62bb0525648a5d2895bf0b
Reviewed-on: https://go-review.googlesource.com/c/go/+/282013
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
2021-01-08 02:03:24 +00:00
Ian Lance Taylor
cab1202183 cmd/link: accept extra blocks in TestFallocate
For #41127

Change-Id: I794a082299c6dce4202223197ece1864bed36810
Reviewed-on: https://go-review.googlesource.com/c/go/+/282555
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
2021-01-08 01:58:34 +00:00
Meng Zhuo
ee4d32249b io/fs: minor corrections to Glob release date
io/fs is introduced in 2020, not 2009 nor 2010

Change-Id: I7d63aae17b1f8c3af1ded2f639e3fb76ff2aea81
Reviewed-on: https://go-review.googlesource.com/c/go/+/282232
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2021-01-08 01:48:01 +00:00
Ian Lance Taylor
54bd1ccce2 cmd: update to latest golang.org/x/tools
In particular bring in CL 201973, which reverts support for multiple
keys in a struct tag.

For #40281
For #43083
For #43226

Change-Id: I66e76639cbbca55bdbff6956acdb0a97650fdd31
Reviewed-on: https://go-review.googlesource.com/c/go/+/282412
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2021-01-08 01:33:44 +00:00