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 #36817Fixes#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>
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>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
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>
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>
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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>
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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>
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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>
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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>
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
For #43985
Change-Id: I1a16f66800c5c648703f0a0d2ad75024525a710f
Reviewed-on: https://go-review.googlesource.com/c/go/+/291389
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
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This update was created using the updatecontrib command:
go get golang.org/x/build/cmd/updatecontrib
cd gotip
updatecontrib
With manual changes based on publicly available information
to canonicalize letter case and formatting for a few names.
For #12042.
Change-Id: I030b77e8ebcc7fe02106f0f264acdfb0b56e20d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/291189
Trust: Carlos Amedee <carlos@golang.org>
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* 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
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A caller is not always in a function.
For example, a call can appear in top level declarations.
e.g. var x = f()
Change-Id: I29c4c3b7663249434fb2b8a6d0003267c77268cf
Reviewed-on: https://go-review.googlesource.com/c/go/+/290849
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Robert Griesemer <gri@golang.org>
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
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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
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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>
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
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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>
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This is an exact port of CL 288632 to go/types.
Change-Id: Ie46e13355bdd0713b392e042844bab8491a16504
Reviewed-on: https://go-review.googlesource.com/c/go/+/290629
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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
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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>
Trust: Robert Findley <rfindley@google.com>
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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
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
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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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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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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
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Fixes#44150
Change-Id: Ibe5bfba01491dd8c2f0696fab40a1673230d76e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/290349
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Fixes#44171
Change-Id: I2d3437a2f5b9fa0358e4664e1a8eacebed975eed
Reviewed-on: https://go-review.googlesource.com/c/go/+/290512
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This vet check was added in CL 243397.
For #40700.
Change-Id: Ibff6df9395d37bb2b84a791443578009f23af4fb
GitHub-Last-Rev: e47c38f630
GitHub-Pull-Request: golang/go#44147
Reviewed-on: https://go-review.googlesource.com/c/go/+/290330
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
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
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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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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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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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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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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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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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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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Add missed heading tag in CL 276373.
For #40700
Change-Id: Ida9e8861589bbc296a5a1cecbf9fe33fa09ed0ca
GitHub-Last-Rev: d218f8d4b7
GitHub-Pull-Request: golang/go#44111
Reviewed-on: https://go-review.googlesource.com/c/go/+/289869
Reviewed-by: Tim King <taking@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Trust: Tim King <taking@google.com>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
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
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
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
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Define g register as R14 on AMD64. It is not used now, but will
be in later CLs.
The name "R14" is still recognized.
Change-Id: I9a066b15bf1051113db8c6640605e350cea397b9
Reviewed-on: https://go-review.googlesource.com/c/go/+/289195
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
racecallbackthunk is called from C, and it needs to follow C ABI.
The assembly code preserves C callee-save registers. It must not
be called via wrappers, which may not preserve those registers.
Change-Id: Icd72c399f4424d73c4882860d85057fe2671f6aa
Reviewed-on: https://go-review.googlesource.com/c/go/+/289194
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
rt0_go is not actually ABIInternal, and it actually has callers
(e.g. _rt0_amd64).
Change-Id: Id730176e620ad9f443e6bfca6ded81a1367531ba
Reviewed-on: https://go-review.googlesource.com/c/go/+/289193
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Currently, when using cgo, the g pointer is set via a separate
call to setg_gcc or with inline assembly in threadentry. This CL
changes it to call setg_gcc in crosscall_amd64, like other g-
register platforms. When we have an actual g register on AMD64,
we'll need to set the register immediately before calling into
Go.
Change-Id: Ib1171e05cd0dabba3b7d12e072084d141051cf3d
Reviewed-on: https://go-review.googlesource.com/c/go/+/289192
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
This is a port of CL 279424, which didn't make it into master in time
for go1.16. Move it to dev.regabi so that it may be merged.
Notably, this port no longer removes the _InvalidInitSig error code,
instead opting to deprecate it. Now that error codes are 'locked in' for
go1.16, even if their API may not yet be exposed, we should follow the
practice of not changing their values. In the future, code generation
can make it easier to keep error code values constant.
For #43308
Change-Id: I5260b93fd063393d38d6458e45a67e7f9b7426ed
Reviewed-on: https://go-review.googlesource.com/c/go/+/289714
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>
Symbol's Attributes and ABI are in the same word. In the
concurrent backend, we may read one symbol's ABI (the callee)
while setting its attributes in another goroutine.
Fix racecompile build.
Change-Id: I500e869bafdd72080119ab243db94eee3afcf926
Reviewed-on: https://go-review.googlesource.com/c/go/+/289290
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>
On the dev.typeparams and dev.go2go branches, check_test.go has been
updated to automatically discover test data. This is convenient, so port
it to dev.regabi.
Change-Id: I5da9a9a5139c35a2693e64364eb9928ece1cd7c6
Reviewed-on: https://go-review.googlesource.com/c/go/+/289713
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>
