Commit Graph

39337 Commits

Author SHA1 Message Date
Cherry Zhang 03cea563d1 [dev.regabi] all: merge master (5faf941) into dev.regabi
Merge List:

+ 2021-02-16 5faf941df0 internal/goversion: update Version to 1.17
+ 2021-02-16 6f3da9d2f6 README: pull gopher image from website
+ 2021-02-16 098504c73f cmd/link: generate trampoline for inter-dependent packages
+ 2021-02-16 1004a7cb31 runtime/metrics: update documentation to current interface
+ 2021-02-16 6530f2617f doc/go1.16: remove draft notice
+ 2021-02-16 353e111455 doc/go1.16: fix mismatched id attribute
+ 2021-02-16 f0d23c9dbb internal/poll: netpollcheckerr before sendfile
+ 2021-02-16 0cb3415154 doc: remove all docs not tied to distribution
+ 2021-02-16 626ef08127 doc: remove install.html and install-source.html
+ 2021-02-16 30641e36aa internal/poll: if copy_file_range returns 0, assume it failed
+ 2021-02-15 33d72fd412 doc/faq: update generics entry to reflect accepted proposal
+ 2021-02-15 852ce7c212 cmd/go: provide a more helpful suggestion for "go vet -?"
+ 2021-02-13 66c27093d0 cmd/link: fix typo in link_test.go

Change-Id: I98f047b79b93c5ceb344dd43408bcb919b23aeb3
2021-02-16 16:18:19 -05:00
Cherry Zhang b8fb049c7a [dev.regabi] cmd/go: copy internal/abi in TestNewReleaseRebuildsStalePackagesInGOPATH
The internal/abi package is used by runtime and needs to be
copied.

Fix longtest builders.

Change-Id: I7a962df3db2c6bf68cc6a7da74b579f381920009
Reviewed-on: https://go-review.googlesource.com/c/go/+/292592
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
2021-02-16 21:17:18 +00:00
Bryan C. Mills 5faf941df0 internal/goversion: update Version to 1.17
(The corresponding update for the last release cycle was CL 248038.)

For #40705.

Change-Id: I13becdc4c3718a1c6986876ec56879cce3bcb34f
Reviewed-on: https://go-review.googlesource.com/c/go/+/275297
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
2021-02-16 21:07:42 +00:00
Rob Findley ed55da46ab [dev.regabi] go/types: overlapping embedded interfaces requires go1.14
This is an exact port of CL 290911 to go/types.

For #31793

Change-Id: I28c42727735f467a5984594b455ca58ab3375591
Reviewed-on: https://go-review.googlesource.com/c/go/+/291319
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-02-16 21:01:52 +00:00
Rob Findley 7696c94334 [dev.regabi] go/types: type alias decl requires go1.9
This is a port of CL 289570 to go/types. It has some notable differences
with that CL:
 + A new _BadDecl error code is added, to indicate declarations with bad
   syntax.
 + declInfo is updated hold not an 'alias' bool, but an aliasPos
   token.Pos to identify the location of the type aliasing '=' token.
   This allows for error messages to be accurately placed on the '='

For #31793

Change-Id: Ib15969f9cd5be30228b7a4c6406f978d6fc58018
Reviewed-on: https://go-review.googlesource.com/c/go/+/291318
Trust: Robert Findley <rfindley@google.com>
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-02-16 21:01:14 +00:00
Michael Anthony Knyszek c2358a1ae7 [dev.regabi] runtime: stub out spillArgs and unspillArgs
Currently these two functions assume that constants in internal/abi are
set correctly, but we actually just made them zero if
GOEXPERIMENT_REGABI is set. This means reflectcall is broken. Fix it by
stubbing out these routines even if GOEXPERIMENT_REGABI is set.

Change-Id: I4c8df6d6af28562c5bb7b85f48c03d37daa9ee0d
Reviewed-on: https://go-review.googlesource.com/c/go/+/292650
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
2021-02-16 20:42:26 +00:00
Michael Anthony Knyszek 8cfbf34dd9 internal/abi: set register count constants to zero for regabi experiment
This change sets the register count constants to zero for the
GOEXPERIMENT regabi because currently the users of it (i.e. reflect)
will be broken, since they expect Go functions that implement the new
ABI.

Change-Id: Id3e874c61821a36605eb4e1cccdee36a2759f303
Reviewed-on: https://go-review.googlesource.com/c/go/+/292649
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
2021-02-16 19:40:58 +00:00
Cherry Zhang d28aae26b0 [dev.regabi] cmd/link: recognize internal/abi as runtime package
The runtime imports the internal/abi package. Recognize
internal/abi as a runtime dependent, to make trampoline generation
algorithm work.

Fix ARM build.

Change-Id: I26b6778aa41dcb959bc226ff04abe08a5a82c4f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/292610
Reviewed-by: Than McIntosh <thanm@google.com>
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
2021-02-16 18:21:51 +00:00
Cherry Zhang 098504c73f cmd/link: generate trampoline for inter-dependent packages
Currently, in the trampoline generation pass we expect packages
are laid out in dependency order, so a cross-package jump always
has a known target address so we can check if a trampoline is
needed. With linknames, there can be cycles in the package
dependency graph, making this algorithm no longer work. For them,
as the target address is unkown we conservatively generate a
trampoline. This may generate unnecessary trampolines (if the
packages turn out laid together), but package cycles are extremely
rare so this is fine.

Updates #44073.

Change-Id: I2dc2998edacbda27d726fc79452313a21d07787a
Reviewed-on: https://go-review.googlesource.com/c/go/+/292490
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
2021-02-16 17:42:55 +00:00
Branden J Brown 1004a7cb31 runtime/metrics: update documentation to current interface
The package documentation referenced sample metadata that was removed in CL 282632. Update this documentation to be less specific
about what metadata is available.

Additionally, the documentation on the Sample type referred to Descriptions instead of All as the source of metrics names.

Fixes #44280.

Change-Id: I24fc63a744bf498cb4cd5bda56c1599f6dd75929
Reviewed-on: https://go-review.googlesource.com/c/go/+/292309
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
2021-02-16 16:26:30 +00:00
Michael Anthony Knyszek e0215315f5 [dev.regabi] reflect: support for register ABI on amd64 for reflect.(Value).Call
This change adds support for the new register ABI on amd64 to
reflect.(Value).Call. If internal/abi's register counts are non-zero,
reflect will try to set up arguments in registers on the Call path.

Note that because the register ABI becomes ABI0 with zero registers
available, this should keep working as it did before.

This change does not add any tests for the register ABI case because
there's no way to do so at the moment.

For #40724.

Change-Id: I8aa089a5aa5a31b72e56b3d9388dd3f82203985b
Reviewed-on: https://go-review.googlesource.com/c/go/+/272568
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
2021-02-16 15:51:50 +00:00
Wei Fu f0d23c9dbb internal/poll: netpollcheckerr before sendfile
In net/http package, the ServeContent/ServeFile doesn't check the I/O
timeout error from chunkWriter or *net.TCPConn, which means that both
HTTP status and headers might be missing when WriteTimeout happens. If
the poll.SendFile() doesn't check the *poll.FD state before sending
data, the client will only receive the response body with status and
report "malformed http response/status code".

This patch is to enable netpollcheckerr before sendfile, which should
align with normal *poll.FD.Write() and Splice().

Fixes #43822

Change-Id: I32517e3f261bab883a58b577b813ef189214b954
Reviewed-on: https://go-review.googlesource.com/c/go/+/285914
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
2021-02-16 11:01:41 +00:00
Russ Cox 0cb3415154 doc: remove all docs not tied to distribution
They have moved to x/website in CL 291693.
The docs that are left are the ones that are edited at the same time
as development in this repository and are tied to the specific version
of Go being developed. Those are:

 - the language spec
 - the memory model
 - the assembler manual
 - the current release's release notes

Change-Id: I437c4d33ada1b1716b1919c3c939c2cacf407e83
Reviewed-on: https://go-review.googlesource.com/c/go/+/291711
Trust: Russ Cox <rsc@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
2021-02-16 02:07:02 +00:00
Ian Lance Taylor 30641e36aa internal/poll: if copy_file_range returns 0, assume it failed
On current Linux kernels copy_file_range does not correctly handle
files in certain special file systems, such as /proc. For those file
systems it fails to copy any data and returns zero. This breaks Go's
io.Copy for those files.

Fix the problem by assuming that if copy_file_range returns 0 the
first time it is called on a file, that that file is not supported.
In that case fall back to just using read. This will force an extra
system call when using io.Copy to copy a zero-sized normal file,
but at least it will work correctly.

For #36817
Fixes #44272

Change-Id: I02e81872cb70fda0ce5485e2ea712f219132e614
Reviewed-on: https://go-review.googlesource.com/c/go/+/291989
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2021-02-16 00:46:04 +00:00
Rob Pike 852ce7c212 cmd/go: provide a more helpful suggestion for "go vet -?"
For the command

	go vet -?

the output was,

	usage: go vet [-n] [-x] [-vettool prog] [build flags] [vet flags] [packages]
	Run 'go help vet' for details.
	Run 'go tool vet -help' for the vet tool's flags.

but "go help vet" is perfunctory at best. (That's another issue I'm
working on—see https://go-review.googlesource.com/c/tools/+/291909—
but vendoring is required to sort that out.) Add another line and rewrite
a bit to make it actually helpful:

	usage: go vet [-n] [-x] [-vettool prog] [build flags] [vet flags] [packages]
	Run 'go help vet' for details.
	Run 'go tool vet help' for a full list of flags and analyzers.
	Run 'go tool vet -help' for an overview.

Change-Id: I9d8580f0573321a57d55875ac3185988ce3eaf64
Reviewed-on: https://go-review.googlesource.com/c/go/+/291929
Trust: Rob Pike <r@golang.org>
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2021-02-15 01:37:28 +00:00
Ikko Ashimine 66c27093d0 cmd/link: fix typo in link_test.go
specfic -> specific

Change-Id: Icad0f70c77c866a1031a2929b90fef61fe92aaee
GitHub-Last-Rev: f66b56491c
GitHub-Pull-Request: golang/go#44246
Reviewed-on: https://go-review.googlesource.com/c/go/+/291829
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
2021-02-13 15:15:13 +00:00
Rob Findley b81efb7ec4 [dev.regabi] go/types: add support for language version checking
This is a port of CL 289509 to go/types. It differs from that CL in
codes added to errors, to fit the new factoring of check_test.go, and to
allow go/types to import regexp in deps_test.go

For #31793

Change-Id: Ia9e4c7f5aac1493001189184227c2ebc79a76e77
Reviewed-on: https://go-review.googlesource.com/c/go/+/291317
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-02-13 00:40:18 +00:00
Rob Findley a7e9b4b948 [dev.regabi] go/types: untyped shift counts must fit into uint
This is a port of CL 283872 to go/types. It differs from that CL only in
added error codes.

For #43697

Change-Id: I62277834cef1c0359bcf2c6ee4388731babbc855
Reviewed-on: https://go-review.googlesource.com/c/go/+/291316
Trust: Robert Findley <rfindley@google.com>
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-02-13 00:39:59 +00:00
Rob Findley 060fa49bd2 [dev.regabi] go/types: refuse excessively long constants
This is a port of CL 289049 to go/types. In that CL, tests were written
using the ability of tests/run.go to generate test packages dynamically.
For this CL, similar functionality is added to the go/types errmap
tests: tests are refactored to decouple the loading of source code from
the filesystem, so that tests for long constants may be generated
dynamically rather than checked-in as a large testdata file.

Change-Id: I92c7cb61a8d42c6593570ef7ae0af86b501fa34e
Reviewed-on: https://go-review.googlesource.com/c/go/+/290949
Trust: Robert Findley <rfindley@google.com>
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-02-13 00:39:48 +00:00
Michael Anthony Knyszek baa6c75dce [dev.regabi] internal/abi: add new internal/abi package for ABI constants
This change creates a new internal std package internal/abi which is
intended to hold constants with platform-specific values related to
our ABI that is useful to different std packages, such as runtime and
reflect.

For #40724.

Change-Id: Ie7ae7f687629cd3d613ba603e9371f0887601fe6
Reviewed-on: https://go-review.googlesource.com/c/go/+/272567
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Austin Clements <austin@google.com>
2021-02-12 22:11:52 +00:00
Cherry Zhang d1fd9a8863 [dev.regabi] all: merge master (ff0e93e) into dev.regabi
Conflicts:

- src/cmd/compile/internal/gc/walk.go

  gc/walk.go is changed in CL 290950 on the master branch but
  deleted in the dev.regabi branch and moved over to the walk
  package. This CL includes porting CL 290950 over to the new
  walk.

Merge List:

+ 2021-02-12 ff0e93ea31 doc/go1.16: note that package path elements beginning with '.' are disallowed
+ 2021-02-11 249da7ec02 CONTRIBUTORS: update for the Go 1.16 release
+ 2021-02-11 864d4f1c6b cmd/go: multiple small 'go help' fixes
+ 2021-02-11 26ceae85a8 spec: More precise wording in section on function calls.
+ 2021-02-11 930c2c9a68 cmd/go: reject embedded files that can't be packed into modules
+ 2021-02-11 e5b08e6d5c io/fs: allow backslash in ValidPath, reject in os.DirFS.Open
+ 2021-02-10 ed8079096f cmd/compile: mark concrete call of reflect.(*rtype).Method as REFLECTMETHOD
+ 2021-02-09 e9c9683597 cmd/go: suppress errors from 'go get -d' for packages that only conditionally exist
+ 2021-02-09 e0ac989cf3 archive/tar: detect out of bounds accesses in PAX records resulting from padded lengths
+ 2021-02-09 c9d6f45fec runtime/metrics: fix a couple of documentation typpos
+ 2021-02-09 cea4e21b52 io/fs: backslash is always a glob meta character
+ 2021-02-08 dc725bfb3c doc/go1.16: mention new vet check for asn1.Unmarshal

Change-Id: Ib28fffa7dfbff7f6cdbfaf4a304757fead7bbf19
2021-02-12 16:35:21 -05:00
Jay Conrod 864d4f1c6b cmd/go: multiple small 'go help' fixes
* Link to privacy policies for proxy.golang.org and sum.golang.org in
  'go help modules'. It's important that both policies are linked from
  the go command's documentation.
* Fix wording and typo in 'go help vcs' following comments in CL 290992,
  which adds reference documentation for GOVCS.
* Fix whitespace on GOVCS in 'go help environment'.

For #41730

Change-Id: I86abceacd4962b748361244026f219157c9285e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/291230
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
2021-02-11 18:02:48 +00:00
Russ Cox 930c2c9a68 cmd/go: reject embedded files that can't be packed into modules
If the file won't be packed into a module,
don't put those files into embeds.
Otherwise people will be surprised when things work
locally but not when imported by another module.

Observed on CL 290709

Change-Id: Ia0ef7d0e0f5e42473c2b774e57c843e68a365bc7
Reviewed-on: https://go-review.googlesource.com/c/go/+/290809
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
2021-02-11 01:10:35 +00:00
Russ Cox e5b08e6d5c io/fs: allow backslash in ValidPath, reject in os.DirFS.Open
Rejecting backslash introduces problems with presenting
underlying OS file systems that contain names with backslash.
Rejecting backslash also does not Windows-proof the syntax,
because colon can also be a path separator. And we are not
going to reject colon from all names. So don't reject backslash
either.

There is a similar problem on Windows with names containing
slashes, but those are more difficult (though not impossible)
to create.

Also document and enforce that paths must be UTF-8.

Fixes #44166.

Change-Id: Iac7a9a268025c1fd31010dbaf3f51e1660c7ae2a
Reviewed-on: https://go-review.googlesource.com/c/go/+/290709
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
2021-02-11 01:10:28 +00:00
Cherry Zhang ed8079096f cmd/compile: mark concrete call of reflect.(*rtype).Method as REFLECTMETHOD
For functions that call reflect.Type.Method (or MethodByName), we
mark it as REFLECTMETHOD, which tells the linker that methods
can be retrieved via reflection and the linker keeps all exported
methods live. Currently, this marking expects exactly the
interface call reflect.Type.Method (or MethodByName). But now the
compiler can devirtualize that call to a concrete call
reflect.(*rtype).Method (or MethodByName), which is not handled
and causing the linker to discard methods too aggressively.
Handle the latter in this CL.

Fixes #44207.

Change-Id: Ia4060472dbff6ab6a83d2ca8e60a3e3f180ee832
Reviewed-on: https://go-review.googlesource.com/c/go/+/290950
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2021-02-10 22:44:54 +00:00
Cherry Zhang 59703d53e2 [dev.regabi] cmd/link: stop using ABI aliases if wrapper is enabled
If ABI wrappers are enabled, we should not see ABI aliases at
link time. Stop resolving them. One exception is shared linkage,
where we still use ABI aliases as we don't always know the ABI
for symbols from shared libraries.

Change-Id: Ia89a788094382adeb4c4ef9b0312aa6e8c2f79ef
Reviewed-on: https://go-review.googlesource.com/c/go/+/290032
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
2021-02-10 15:40:37 +00:00
Bryan C. Mills e9c9683597 cmd/go: suppress errors from 'go get -d' for packages that only conditionally exist
Fixes #44106
Fixes #29268

Change-Id: Id113f2ced274d43fbf66cb804581448218996f81
Reviewed-on: https://go-review.googlesource.com/c/go/+/289769
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
2021-02-09 18:40:13 +00:00
Rob Findley 168d6a49a5 [dev.regabi] go/types: use 512 bits as max. integer precision
This is a port of CL 288633 to go/types. It differs from that CL
in the implementation of opName, which now uses ast Exprs.

Additionally, a couple tests had to be updated:
 + TestEvalArith is updated to not overflow.
 + stmt0.src is updated to have an error positioned on the '<<'
   operator.

Change-Id: I628357c33a1e7b0bb5bb7de5736f1fb10ce404e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/290630
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-02-09 14:17:01 +00:00
Rob Findley 0a62067708 [dev.regabi] go/types: adjust importer to match compiler importer
This is an exact port of CL 288632 to go/types.

Change-Id: Ie46e13355bdd0713b392e042844bab8491a16504
Reviewed-on: https://go-review.googlesource.com/c/go/+/290629
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-02-09 14:15:43 +00:00
Rob Findley 1c58fcf7ed [dev.regabi] go/types: handle untyped constant arithmetic overflow
This is a port of CL 287832 for go/types. It differs from that CL in its
handling of position data. Unlike the syntax package, which has a
unified Operation node, go/types checks operations for ast.UnaryExpr,
IncDecStmt, and BinaryExpr. It was simpler to keep the existing position
logic. Notably, this correctly puts the errors on the operator.

Change-Id: Id1e3aefe863da225eb0a9b3628cfc8a5684c0c4f
Reviewed-on: https://go-review.googlesource.com/c/go/+/290569
Run-TryBot: Robert Findley <rfindley@google.com>
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Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Robert Findley <rfindley@google.com>
2021-02-09 14:15:25 +00:00
Rob Findley 493363ccff [dev.regabi] go/types: must not import a package called "init"
This is a port of CL 287494 to go/types. The additional checks in
test/fixedbugs are included, though they won't be executed by go/types.
Support for errorcheckdir checks will be added to go/types in a later
CL.

Change-Id: I37e202ea5daf7d7b8fc6ae93a4c4dbd11762480f
Reviewed-on: https://go-review.googlesource.com/c/go/+/290570
Reviewed-by: Robert Griesemer <gri@golang.org>
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2021-02-09 14:00:14 +00:00
Emmanuel T Odeke e0ac989cf3 archive/tar: detect out of bounds accesses in PAX records resulting from padded lengths
Handles the case in which padding of a PAX record's length field
violates invariants about the formatting of record, whereby it no
longer matches the prescribed format:

    "%d %s=%s\n", <length>, <keyword>, <value>

as per:

    https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_03

0-padding, and paddings of other sorts weren't handled and we assumed
that only non-padded decimal lengths would be passed in.
Added test cases to ensure that the parsing still proceeds as expected.

The prior crashing repro:

    0000000000000000000000000000000030 mtime=1432668921.098285006\n30 ctime=2147483649.15163319

exposed the fallacy in the code, that assumed that the length would ALWAYS be a
non-padded decimal length string.

This bug has existed since Go1.1 as per CL 6700047.

Thanks to Josh Bleecher Snyder for fuzzing this package, and thanks to Tom
Thorogood for advocacy, raising parity with GNU Tar, but for providing more test cases.

Fixes #40196

Change-Id: I32e0af4887bc9221481bd9e8a5120a79f177f08c
Reviewed-on: https://go-review.googlesource.com/c/go/+/289629
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2021-02-09 05:28:50 +00:00
Rob Findley c48d1503ba [dev.regabi] go/types: report unused packages in source order
This is a port of CL 287072 to go/types.

Change-Id: I08f56995f0323c1f238d1b44703a481d393471d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/289720
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2021-02-09 03:59:20 +00:00
Rob Findley 813958f13c [dev.regabi] go/types: factor out sorting of methods
This is a port of CL 285993 to go/types.

Change-Id: I7560cf1176fea5de2c54786a086e547c73294a60
Reviewed-on: https://go-review.googlesource.com/c/go/+/289717
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2021-02-09 03:57:38 +00:00
Rob Findley 11d15c171b [dev.regabi] go/types: convert untyped arguments to delete
This is a port of CL 285059 to go/types. The error assertion is updated
to match go/types error for assignment, which has been improved.

Change-Id: Icdd2751edea0abef7c84feadcbf9265d71239ade
Reviewed-on: https://go-review.googlesource.com/c/go/+/289716
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2021-02-09 03:28:12 +00:00
Ian Lance Taylor c9d6f45fec runtime/metrics: fix a couple of documentation typpos
Fixes #44150

Change-Id: Ibe5bfba01491dd8c2f0696fab40a1673230d76e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/290349
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2021-02-09 02:00:01 +00:00
Ian Lance Taylor cea4e21b52 io/fs: backslash is always a glob meta character
Fixes #44171

Change-Id: I2d3437a2f5b9fa0358e4664e1a8eacebed975eed
Reviewed-on: https://go-review.googlesource.com/c/go/+/290512
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2021-02-09 01:22:45 +00:00
Rob Findley 618e3c15bd [dev.regabi] go/types: consistently report nil type as "untyped nil"
This is a port of CL 284052 to go/types. The port is not entirely
faithful, as untyped conversion has been refactored in go/types.
Additionally, a comment was added to reference issue #13061 in the
implicitType method.

For #13061

Change-Id: Iec17611f6432c988624023d1d74121ff34eb0c83
Reviewed-on: https://go-review.googlesource.com/c/go/+/289715
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2021-02-08 23:25:48 +00:00
Cherry Zhang 50449de66a [dev.regabi] all: merge master (1901853) into dev.regabi
Merge List:

+ 2021-02-08 1901853098 runtime/metrics: fix panic in readingAllMetric example
+ 2021-02-08 ed3e4afa12 syscall/plan9: remove spooky fd action at a distance
+ 2021-02-05 724d0720b3 doc/go1.16: add missed heading tag in vet section
+ 2021-02-05 b54cd94d47 embed, io/fs: clarify that leading and trailing slashes are disallowed
+ 2021-02-05 4516afebed testing/fstest: avoid symlink-induced failures in tester
+ 2021-02-04 8869086d8f runtime: fix typo in histogram.go
+ 2021-02-03 e491c6eea9 math/big: fix comment in divRecursiveStep

Change-Id: I5e2bd18f42251eeb4ad0bf5c93a08c6a9b873d7b
2021-02-08 14:01:08 -05:00
Cherry Zhang 7b0dfb177f [dev.regabi] runtime: use g register in some assembly functions on AMD64
Now that we have a g register, just use it.

Note: functions that can be called from ABI0 context (e.g.
morestack) is unchanged. Functions that switch g is also
unchanged, because we need to set the new g in both the register
and TLS.

TODO: other OSes.

Change-Id: I692a82a7caa8417ff620a59676a6275f56747b94
Reviewed-on: https://go-review.googlesource.com/c/go/+/289718
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2021-02-08 18:48:12 +00:00
Cherry Zhang 2e60c00f56 [dev.regabi] cmd/internal/obj/x86: use g register in stack bounds check
In ABIInternal context, we can directly use the g register for
stack bounds check.

Change-Id: I8b1073a3343984a6cd76cf5734ddc4a8cd5dc73f
Reviewed-on: https://go-review.googlesource.com/c/go/+/289711
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Reviewed-by: David Chase <drchase@google.com>
2021-02-08 17:49:38 +00:00
Cherry Zhang 22f9e1ccbc [dev.regabi] runtime: initialize special registers before sigpanic
In case that we are panicking in ABI0 context or external code,
special registers are not initialized. Initialized them in
injected code before calling sigpanic.

TODO: Windows, Plan 9.

Change-Id: I0919b80e7cc55463f3dd94f1f63cba305717270a
Reviewed-on: https://go-review.googlesource.com/c/go/+/289710
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2021-02-08 17:48:48 +00:00
Cherry Zhang 5d7dc53888 [dev.regabi] cmd/compile, runtime: reserve R14 as g registers on AMD64
This is a proof-of-concept change for using the g register on
AMD64. getg is now lowered to R14 in the new ABI. The g register
is not yet used in all places where it can be used (e.g. stack
bounds check, runtime assembly code).

Change-Id: I10123ddf38e31782cf58bafcdff170aee0ff0d1b
Reviewed-on: https://go-review.googlesource.com/c/go/+/289196
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Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: David Chase <drchase@google.com>
2021-02-08 16:30:07 +00:00
Changkun Ou 1901853098 runtime/metrics: fix panic in readingAllMetric example
medianBucket can return if the total is greater than thresh.
However, if a histogram has no counts, total and thresh
will both be zero and cause panic.

Adding an equal sign to prevent the potential panic.

Fixes #44148

Change-Id: Ifb8a781990f490d142ae7c035b4e01d6a07ae04d
Reviewed-on: https://go-review.googlesource.com/c/go/+/290171
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2021-02-08 16:09:01 +00:00
Ori Bernstein ed3e4afa12 syscall/plan9: remove spooky fd action at a distance
Change Plan 9 fork/exec to use the O_CLOEXEC file
descriptor, instead of relying on spooky at a
distance.

Historically, Plan 9 has set the O_CLOEXEC flag on
the underlying channels in the kernel, rather
than the file descriptors -- if two fds pointed
at a single channel, as with dup, changing the
flags on one of them would be observable on the
other.

The per-Chan semantics are ok, if unexpected,
when a chan is only handled within a single
process, but this isn't always the case.

Forked processes share Chans, but even more of
a problem is the interaction between /srv and
OCEXEC, which can lead to unexectedly closed
file descriptors in completely unrelated
proceses. For example:

	func exists() bool {
		// If some other thread execs here,
		// we don't want to leak the fd, so
		// open it O_CLOEXEC
		fd := Open("/srv/foo", O_CLOEXEC)
		if fd != -1 {
			Close(fd)
			return true
		}
		return false
	}

would close the connection to any file descriptor
(maybe even for the root fs) in ALL other processes
that have it open if an exec were to happen(!),
which is quite undesriable.

As a result, 9front will be changing this behavior
for the next release.

Go is the only code observed so far that relies on
this behavior on purpose, and  It's easy to make the
code work with both semantics: simply using the file
descriptor that was opened with O_CEXEC instead of
throwing it away.

So we do that here.

Fixes #43524

Change-Id: I4887f5c934a5e63e5e6c1bb59878a325abc928d3
GitHub-Last-Rev: 96bb21bd1e
GitHub-Pull-Request: golang/go#43533
Reviewed-on: https://go-review.googlesource.com/c/go/+/281833
Reviewed-by: David du Colombier <0intro@gmail.com>
Reviewed-by: Richard Miller <millerresearch@gmail.com>
Reviewed-by: Jacob Moody <j4kem00dy@gmail.com>
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2021-02-08 15:56:59 +00:00
Cherry Zhang a21de9ec73 [dev.regabi] cmd/link: resolve symbol ABI in shared linkage
In shared build mode and linkage, currently we assume all
function symbols are ABI0 (except for generated type algorithm
functions), and alias them to ABIInternal. When the two ABIs
actually differ (as it is now), this is not actually correct.
This CL resolves symbol ABI based on their mangled names.
If the symbol's name has a ".abi0" or ".abiinternal" suffix, it
is of the corresponding ABI. The symbol without the suffix is
the other ABI. For functions without ABI wrapper generated,
only one ABI exists but we don't know what it is, so we still
use alias (for now).

Change-Id: I2165f149bc83d513e81eb1eb4ee95464335b0e75
Reviewed-on: https://go-review.googlesource.com/c/go/+/289289
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2021-02-08 15:50:35 +00:00
Jay Conrod b54cd94d47 embed, io/fs: clarify that leading and trailing slashes are disallowed
Fixes #44012

Change-Id: I5782cea301a65ae12ba870ff1e6b2e0a2651dc09
Reviewed-on: https://go-review.googlesource.com/c/go/+/290071
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2021-02-05 22:35:11 +00:00
Russ Cox 4516afebed testing/fstest: avoid symlink-induced failures in tester
Do not require directory entry and Stat result to match for symlinks,
because they won't (Stat dereferences the symlink).

Fixes #44113.

Change-Id: Ifc6dbce5719906e2f42254a7172f1ef787464a9e
Reviewed-on: https://go-review.googlesource.com/c/go/+/290009
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2021-02-05 21:03:18 +00:00
Cherry Zhang 8fa84772ba [dev.regabi] runtime: delete gosave function
The runtime.gosave function is not used anywhere. Delete.

Note: there is also a gosave<> function, which is actually used
and not deleted.

Change-Id: I64149a7afdd217de26d1e6396233f2becfad7153
Reviewed-on: https://go-review.googlesource.com/c/go/+/289719
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2021-02-05 20:05:30 +00:00
Cherry Zhang 946351d5a2 [dev.regabi] runtime: zero X15 in racecall
racecall can be called in ABIInternal context (e.g. raceread
calling racecalladdr calling racecall) without wrapper. racecall
calls C code, which doesn't preserve our special registers. Set
them explicitly in racecall upon returning from C.

Change-Id: Ic990479c1fca6bb8a3b151325c7a89be8331a530
Reviewed-on: https://go-review.googlesource.com/c/go/+/289709
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2021-02-05 17:34:54 +00:00