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Commit Graph

54386 Commits

Author SHA1 Message Date
Robert Griesemer
19095e109d go/types, types2: remove need for invalidAST prefix in error calls
Since we already provide the error code, the prefix can be deduced
automatically.

Except for the changes in errors.go, the updates were made with
regex find-and-replaces:

check\.error\((.+), InvalidSyntaxTree, invalidAST\+    =>
check.error($1, InvalidSyntaxTree,

check\.errorf\((.+), InvalidSyntaxTree, invalidAST\+    =>
check.errorf($1, InvalidSyntaxTree,

Change-Id: Ia02fc56ac7a8524bdf0c404ff2696435408327e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/441975
Run-TryBot: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2022-10-12 23:00:28 +00:00
Ian Lance Taylor
1a7f08cf40 os/signal: document behavior of SIGPIPE on non-Go thread
Fixes #56150

Change-Id: Id990783562950ba8be7ce9526b7a811625f2190a
Reviewed-on: https://go-review.googlesource.com/c/go/+/442415
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
2022-10-12 22:55:31 +00:00
Michael Anthony Knyszek
6a2a11fc28 misc/cgo/test: add asan and msan arena tests
While we're here, replace a couple uses of os.Environ with cmd.Environ.

For #51317.

Change-Id: Ic5cf4a887a7975a8281223eec0f94df230b6f095
Reviewed-on: https://go-review.googlesource.com/c/go/+/431955
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
2022-10-12 20:44:43 +00:00
Michael Anthony Knyszek
e0d01b8467 arena: add experimental arena package
This change adds the arenas package and a function to reflect for
allocating from an arena via reflection, but all the new API is placed
behind a GOEXPERIMENT.

For #51317.

Change-Id: I026d46294e26ab386d74625108c19a0024fbcedc
Reviewed-on: https://go-review.googlesource.com/c/go/+/423361
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2022-10-12 20:23:36 +00:00
Michael Anthony Knyszek
7866538d25 runtime: add safe arena support to the runtime
This change adds an API to the runtime for arenas. A later CL can
potentially export it as an experimental API, but for now, just the
runtime implementation will suffice.

The purpose of arenas is to improve efficiency, primarily by allowing
for an application to manually free memory, thereby delaying garbage
collection. It comes with other potential performance benefits, such as
better locality, a better allocation strategy, and better handling of
interior pointers by the GC.

This implementation is based on one by danscales@google.com with a few
significant differences:
* The implementation lives entirely in the runtime (all layers).
* Arena chunks are the minimum of 8 MiB or the heap arena size. This
  choice is made because in practice 64 MiB appears to be way too large
  of an area for most real-world use-cases.
* Arena chunks are not unmapped, instead they're placed on an evacuation
  list and when there are no pointers left pointing into them, they're
  allowed to be reused.
* Reusing partially-used arena chunks no longer tries to find one used
  by the same P first; it just takes the first one available.
* In order to ensure worst-case fragmentation is never worse than 25%,
  only types and slice backing stores whose sizes are 1/4th the size of
  a chunk or less may be used. Previously larger sizes, up to the size
  of the chunk, were allowed.
* ASAN, MSAN, and the race detector are fully supported.
* Sets arena chunks to fault that were deferred at the end of mark
  termination (a non-public patch once did this; I don't see a reason
  not to continue that).

For #51317.

Change-Id: I83b1693a17302554cb36b6daa4e9249a81b1644f
Reviewed-on: https://go-review.googlesource.com/c/go/+/423359
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
2022-10-12 20:23:30 +00:00
Michael Anthony Knyszek
4c383951b9 runtime: make (*mheap).sysAlloc more general
This change makes (*mheap).sysAlloc take an explicit list of hints and a
boolean as to whether or not any newly-created heapArenas should be
registered in the full arena list.

This is a refactoring in preparation for arenas.

For #51317.

Change-Id: I0584a033fce3fcb60c5d0bc033d5fb8bd23b2378
Reviewed-on: https://go-review.googlesource.com/c/go/+/432078
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
2022-10-12 20:23:24 +00:00
Michael Anthony Knyszek
987f94fa03 runtime: factor out GC assist credit accounting
No-op change in preparation for arenas.

For #51317.

Change-Id: I0777f21763fcd34957b7e709580cf2b7a962ba67
Reviewed-on: https://go-review.googlesource.com/c/go/+/423365
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2022-10-12 20:23:16 +00:00
Michael Anthony Knyszek
69fc74f3ee runtime: factor out mheap span initialization
This change refactors span heap initialization. This change should just
be a no-op and just prepares for adding support for arenas.

For #51317.

Change-Id: Ie6f877ca10f86d26e7b6c4857b223589a351e253
Reviewed-on: https://go-review.googlesource.com/c/go/+/423364
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
2022-10-12 20:23:11 +00:00
Bryan C. Mills
9ec69908aa os: use the correct constant for P_PID on NetBSD
Dragonfly and FreeBSD both used numerical values for these constants
chosen to be the same as on Solaris. For some reason, NetBSD did not,
and happens to interpret value 0 as P_ALL instead of P_PID
(see 3323ceb782/sys/sys/idtype.h (L43-L44)).

Using the correct value for P_PID should cause wait6 to wait for the
correct process, which may help to avoid the deadlocks reported in

For #50138.
Updates #13987.

Change-Id: I0eacd1faee4a430d431fe48f9ccf837f49c42f39
Reviewed-on: https://go-review.googlesource.com/c/go/+/442478
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Benny Siegert <bsiegert@gmail.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
2022-10-12 19:58:47 +00:00
Bill Zissimopoulos
4a4de14166 runtime: fix invalid pointer in windows/arm64 badsignal2
Initializes the R3 register with an available address in the stack. The addressed location is used to receive the number of bytes written by WriteFile.

Fixes #56080

Change-Id: I0368eb7a31d2d6a098fa9c26e074eb1114a92704
GitHub-Last-Rev: 23dbdb5378
GitHub-Pull-Request: golang/go#56153
Reviewed-on: https://go-review.googlesource.com/c/go/+/442216
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Bryan Mills <bcmills@google.com>
2022-10-12 19:16:52 +00:00
Damien Neil
5bef938125 net/http: fix some test flakes caused by test refactoring
Skip TestTransportPersistConnLeakShortBody in HTTP/2 mode;
it's flaky and was previously HTTP/1-only.

Don't run TestTransportEventTrace and TestTransportIgnores408
in parallel.

Change-Id: I76bc540fac9317185ef7d414c9deafb35bc926b6
Reviewed-on: https://go-review.googlesource.com/c/go/+/442495
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
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2022-10-12 18:11:14 +00:00
Abirdcfly
28a6f9cf2b cmd/go: add Context parameter to download function
Updates #38714

Change-Id: Ie5c7761ec003f84e649fa4c90be184a5ff6a0879
Reviewed-on: https://go-review.googlesource.com/c/go/+/419554
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Joedian Reid <joedian@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
2022-10-12 14:36:26 +00:00
Than McIntosh
0394cbed2e cmd/{cover,covdata}: minor code cleanups
Delete some unused code, and fix a few warnings from staticcheck.

Change-Id: I3d3a6f13dccffda060449948769c305d93a0389c
Reviewed-on: https://go-review.googlesource.com/c/go/+/441936
Reviewed-by: Bryan Mills <bcmills@google.com>
2022-10-12 12:50:46 +00:00
Cuong Manh Le
4bcf94b023 all: prevent fakePC overflow on 386 in libfuzzer mode
fakePC uses hash.Sum32, which returns an uint32. However, libfuzzer
trace/hook functions declare fakePC argument as int, causing overflow on
386 archs.

Fixing this by changing fakePC argument to uint to prevent the overflow.

Fixes #56141

Change-Id: I3994c461319983ab70065f90bf61539a363e0a2a
Reviewed-on: https://go-review.googlesource.com/c/go/+/441996
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2022-10-12 00:12:53 +00:00
Robert Griesemer
e9fd40a866 go/types: add errorcalls_test, apply it, and fix errorf call sites
The errorcalls_test makes sure that we use error instead of errorf
where possible. Copied from types2 and adjusted for go/types.

Change-Id: Ib0572308c87e4415bf89aec8d64e662abe94754b
Reviewed-on: https://go-review.googlesource.com/c/go/+/441958
Reviewed-by: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
2022-10-11 22:10:42 +00:00
Robert Griesemer
140bc24445 cmd/compile/internal/types2: adjust errorcalls_test and apply it
Checker.errorf calls now have an error code and thus require at
least 4 arguments.

Change-Id: Id01c30d5d3cc747ab0b3ba4001e88985192f2d80
Reviewed-on: https://go-review.googlesource.com/c/go/+/441957
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
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2022-10-11 20:50:09 +00:00
Robert Griesemer
2dbc5736b2 go/types: replace invalid(AST|Arg|Op) with errorf and message prefix
This brings go/types error reporting closer to types2.

Except for removing the error functions and one manual correction,
these changes were made by regex-replacing:

check\.invalidAST\((.*), "      =>
check.errorf($1, InvalidSyntaxTree, invalidAST+"

check\.invalidOp\((.*), "       =>
check.errorf($1, invalidOp+"

check\.invalidArg\((.*), "      =>
check.errorf($1, invalidArg+"

A follow-up CL ensures that we use error instead of errorf where
possible.

Change-Id: Iac53dcd9c122b058f98d26d0fb307ef1dfe4e79b
Reviewed-on: https://go-review.googlesource.com/c/go/+/441955
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
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Reviewed-by: Robert Findley <rfindley@google.com>
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2022-10-11 20:49:20 +00:00
Michael Matloob
2e0b97dde6 cmd/go: set dependency go versions for go install --mod=readonly mod@vers
When running go install --mod=readonly module@version. modfetch.GoSumFile
was not set, so the checksumOk check that's done when checking whether
we need to set the GoVersion from the go mod file was failing. Bypass
the checksumOk check when there's no GoSumFile.

For #54908

Change-Id: I56cf9d36a505b1223e6bf82a7d455746e2f09849
Reviewed-on: https://go-review.googlesource.com/c/go/+/439855
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
2022-10-11 20:37:36 +00:00
Ian Lance Taylor
b6e7e16208 math/big: error on buffer length overflow in Rat.GobDecode
Fixes #56156

Change-Id: Ib85ff45f0b0d0eac83c39606ee20b3a312e6e919
Reviewed-on: https://go-review.googlesource.com/c/go/+/442335
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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2022-10-11 20:20:16 +00:00
Michael Matloob
01604129ae cmd/go: do not exit with non-zero code from go list -e -export
go list -e -export puts errors running build actions on the load.Package
corresponding to the failed action rather than exiting with a non zero
exit code.

For #25842

Change-Id: I1fea85cc5a0557f514fe9d4ed3b6a858376fdcde
Reviewed-on: https://go-review.googlesource.com/c/go/+/437298
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
2022-10-11 18:38:10 +00:00
Park Zhou
f1e50a1697 go/parser: simplify code (cleanup)
Change-Id: I0c8823b9c3c12f0f581b24db6a7aa5a0cd913224
Reviewed-on: https://go-review.googlesource.com/c/go/+/407537
Auto-Submit: Robert Griesemer <gri@google.com>
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
2022-10-11 17:48:57 +00:00
Bryan C. Mills
0f64a49460 os/exec: remove protection against a duplicate Close on StdinPipe
As of CL 438347, multiple concurrents calls to Close should be safe.

This removes some indirection and may also make some programs that use
type-assertions marginally more efficient. For example, if a program
calls (*exec.Cmd).StdinPipe to obtain a pipe and then sets that as the
Stdout of another command, that program will now allow the second
command to inherit the file descriptor directly instead of copying
everything through a goroutine.

This will also cause calls to Close after the first to return an error
wrapping os.ErrClosed instead of nil. However, it seems unlikely that
programs will depend on that error behavior: if a program is calling
Write in a loop followed by Close, then if a racing Close occurs it is
likely that the Write would have already reported an error. (The only
programs likely to notice a change are those that call Close — without
Write! — after a call to Wait.)

Updates #56043.
Updates #9307.
Updates #6270.

Change-Id: Iec734b23acefcc7e7ad0c8bc720085bc45988efb
Reviewed-on: https://go-review.googlesource.com/c/go/+/439195
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
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2022-10-11 14:31:32 +00:00
Than McIntosh
1b316e3571 internal/coverage: minor code cleanups
Delete some unused code, various cleanups to fix staticcheck warnings.

Change-Id: Ie475d57735a83351a4977f0dd4bc1387ce06a20e
Reviewed-on: https://go-review.googlesource.com/c/go/+/441935
Reviewed-by: David Chase <drchase@google.com>
2022-10-11 12:40:42 +00:00
Joel Sing
4274ffd4b8 cmd/compile: fold negation into subtraction on riscv64
Fold negation into subtraction and avoid double negation.

This removes around 500 instructions from the Go binary on riscv64.

Change-Id: I4aac6c87baa2a0759b180ba87876d488a23df6d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/431105
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Joedian Reid <joedian@golang.org>
Reviewed-by: Wayne Zuo <wdvxdr@golangcn.org>
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Mui <cherryyz@google.com>
2022-10-11 04:04:13 +00:00
Joel Sing
ba8c94b5f2 cmd/compile: convert SLT/SLTU with constant into immediate form on riscv64
Convert SLT/SLTU with a suitably valued constant into a SLTI/SLTIU instruction.
This can reduce instructions and avoid register loads. Now that we generate
more SLTI/SLTIU instructions, absorb these into branches when it makes sense
to do so.

Removes more than 800 instructions from the Go binary on linux/riscv64.

Change-Id: I42c4e00486697acd4da7669d441b5690795f18ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/428499
Reviewed-by: Wayne Zuo <wdvxdr@golangcn.org>
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Joedian Reid <joedian@golang.org>
2022-10-11 04:03:17 +00:00
Joel Sing
0ca355318f cmd/compile: combine masking and zero extension on riscv64
Combine masking with a negative value and zero extension into a single
AND operation.

Change-Id: I0b2a735b696d65568839fc4504445eeac3d869a6
Reviewed-on: https://go-review.googlesource.com/c/go/+/428498
Reviewed-by: Joedian Reid <joedian@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Run-TryBot: Joel Sing <joel@sing.id.au>
2022-10-11 04:02:34 +00:00
Ian Lance Taylor
bb2a96b79d test: add test case that caused a bogus error from gofrontend
For #56109

Change-Id: I999763e463fac57732a92f5e396f8fa8c35bd2e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/440297
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Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Auto-Submit: Ian Lance Taylor <iant@golang.org>
2022-10-10 21:47:48 +00:00
Cuong Manh Le
fce449680a cmd/compile: fix missing walk pass for static initialization slice
CL 403995 fixed static init of literal contains dynamic exprs, by
ensuring their init are ordered properly. However, we still need to walk
the generated init codes before appending to parent init. Otherwise,
codes that requires desugaring will be unhandled, causing the compiler
backend crashing.

Fixes #56105

Change-Id: Ic25fd4017473f5412c8e960a91467797a234edfd
Reviewed-on: https://go-review.googlesource.com/c/go/+/440455
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Reviewed-by: Keith Randall <khr@golang.org>
2022-10-10 21:39:15 +00:00
Than McIntosh
506e690a26 runtime: mark arenaIdx.l1 and arenaIdx.l2 methods as nosplit
Mark the "l1" and "l2" methods on "arenaIdx" with //go:nosplit, since
these methods are called from a nosplit context (for example, from
"spanOf").

Fixes #56044.
Updates #21314.

Change-Id: I48c7aa756b59a13162c89ef21066f83371ae50f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/441859
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
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2022-10-10 19:56:54 +00:00
Than McIntosh
4a459cbbad cmd/compile: tweak inliners handling of coverage counter updates
This patch fixes up a bug in the inliner's special case code for
coverage counter updates, which was not properly working for
-covermode=atomic compilations.

Updates #56044.

Change-Id: I9e309312b123121c3df02862623bdbab1f6c6a4b
Reviewed-on: https://go-review.googlesource.com/c/go/+/441858
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
2022-10-10 19:56:43 +00:00
qmuntal
742e0a9720 cmd/go: support shared libraries in 'go version' on Windows
This change modifies 'go version' to support shared windows libraries.

Updates #48187

Change-Id: I2e8436b8df84fe76677106fa9ca02dcd1fb90e77
Reviewed-on: https://go-review.googlesource.com/c/go/+/391855
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Joedian Reid <joedian@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
2022-10-10 18:54:31 +00:00
Robert Griesemer
388fbf287c go/types, types2: use zero error code to indicate unset error code
Use InvalidSyntaxError where the zero error code was used before.
Fix a couple of places that didn't set an error code.
Panic in error reporting if no error code is provided.

Change-Id: I3a537d42b720deb5c351bf38871e04919325e231
Reviewed-on: https://go-review.googlesource.com/c/go/+/439566
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Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
2022-10-10 16:03:16 +00:00
Robert Griesemer
578523e4a0 internal/types/errors: add InvalidSyntaxTree error
Type checkers should use InvalidSyntaxTree as error code
for invalid syntax tree errors instead of zero. This way
the zero value can be used to mark an unset error code.

Also, add an example for BlankPkgName (and adjust the
test harness slightly to make it work).

Change-Id: Ic15fa0e8e46be698e52352f2f0e4915b75e509d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/439565
Reviewed-by: Robert Findley <rfindley@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
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2022-10-10 16:02:27 +00:00
Robert Griesemer
6688efd5df cmd/compile/internal/types2: use internal/types/errors instead of local error codes
Change-Id: If9b5c2c5d1b89146250bcd19965797baab315876
Reviewed-on: https://go-review.googlesource.com/c/go/+/439564
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2022-10-10 16:01:34 +00:00
Robert Griesemer
9770b8be68 go/types: use internal/types/errors instead of local error codes
This change adds a new dependency to go/types.

Change-Id: I7e40b95c8c1e1356b638fc1aa2ef16ce91e9a496
Reviewed-on: https://go-review.googlesource.com/c/go/+/439563
Reviewed-by: Robert Griesemer <gri@google.com>
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2022-10-10 15:25:37 +00:00
Robert Griesemer
470d146276 internal/types/errors: rename UntypedNil to UntypedNilUse
This avoids a conflict when dot-importing this package in
go/types and types2.

Change-Id: Ia6fc45ef21c28ea595b49f5321b5c0d441763e2b
Reviewed-on: https://go-review.googlesource.com/c/go/+/439562
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2022-10-10 15:21:11 +00:00
Robert Griesemer
49372957ab internal/types/errors: export error codes
Adjust self-test accordingly.

Change-Id: I69987a306760da9eaf832275af0e9a8b6131a349
Reviewed-on: https://go-review.googlesource.com/c/go/+/439561
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2022-10-10 15:21:10 +00:00
Robert Griesemer
b440c15db7 internal/types/errors: add package
The internal/types/errors package defines all error codes used by
the type checkers. This is the 1st step of several that factor out
the error codes from go/types and types2; the package is not yet
used.

- The file codes.go is a copy of go/types/errorcodes.go. The
  only change is the updated package name (types -> errors).

- The file codes_test.go is a copy of go/types/errorcodes_test.go
  with updated package name (types_test -> errors_test) and minor
  changes to walkCodes so that it doesn't require the pkgFiles
  helper function (the test only parses a single file).

Change-Id: Idb977b1220737b56b330de1d977f698f022daafc
Reviewed-on: https://go-review.googlesource.com/c/go/+/439560
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2022-10-10 15:20:17 +00:00
Robert Griesemer
665992b515 go/types, types2: better error for generic type decl. with missing constraint
If a generic type declaration is missing a constraint, syntactically
it is an array type declaration with an undefined array length.
Mention the possibility of a missing constraint in the error message
for the undefined array length.

For #56064.
For #55961.
For #51145.

Change-Id: Ic161aeda9ea44faa8aa3bf3e9d62b3b13a95d4c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/439559
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2022-10-10 15:17:24 +00:00
Motiejus Jakštys
213504e543 cmd/cgo: use -O2 when testing compiler features
Add "-O2" to all compiler/linker tests. This makes compiler/linker
feature probing better resemble actual compiling later.

Why?
----

zig c++ is a clang front-end[1] that accepts, among other things, the
target over the command line. This command:

    zig c++ -target x86_64-linux-gnu main.o -o main

Will:
1. Pre-compile libc++.a.
2. Link the program with libc++.a from (1).

Currently Go only is learning about one flag from the linker, that is,
"--no-gc-sections". The resulting command that tests for the flag
support is this:

    c++ -Wl,--no-gc-sections -x c - -o

This causes Zig to pre-compile libc++.a in debug mode. Then the actual
compiler+linker command from CGo adds a few more flags, including "-O2":

    c++ <...> -Wl,--no-gc-sections -O2 <...>

From Zig perspective, debug-mode libc++.a is different from the
optimized one; that causes Zig to compile a new libc++.a. Specifically,
Zig adds "-fno-omit-frame-pointer" for debug builds, and
"-fomit-frame-pointer" for optimized builds.

As a result, we have to two sets of libc++.a for every arch/os tuple.
That takes CPU time and a bit of disk space.

Zig performance impact
----------------------

First compilation of a simple CGo application is faster by ~2.5 seconds
or ~60%:

    $ CC="zig c++ -target x86_64-linux-gnu.2.28" hyperfine \
        --warmup 3 --runs 10 \
        --prepare 'rm -fr ~/.cache/zig ~/.cache/go-build /tmp/go-*' \
        --parameter-list go go1.19,go1.19-O2 \
        '/code/go/bin/{go} build .'
    Benchmark 1: /code/go/bin/go1.19 build .
      Time (mean ± σ):      6.168 s ±  0.059 s    [User: 7.465 s, System: 1.578 s]
      Range (min … max):    6.111 s …  6.242 s    10 runs

    Benchmark 2: /code/go/bin/go1.19-O2 build .
      Time (mean ± σ):      3.816 s ±  0.080 s    [User: 4.730 s, System: 1.130 s]
      Range (min … max):    3.657 s …  3.958 s    10 runs

    Summary
      '/code/go/bin/go1.19-O2 build .' ran
        1.62 ± 0.04 times faster than '/code/go/bin/go1.19 build .'

If we add C++ to the mix, the difference grows to almost ~23 seconds, or
almost 90%:

    $ CC="zig c++ -target x86_64-linux-gnu.2.28" hyperfine \
        --warmup 1 --runs 3 \
        --prepare 'rm -fr ~/.cache/zig ~/.cache/go-build /tmp/go-*' \
        --parameter-list go go1.19,go1.19-O2 \
        '/code/go/bin/{go} build .'

    Benchmark 1: CC="zig c++ -target x86_64-linux-gnu.2.28" /code/go/bin/go1.19 build .
      Time (mean ± σ):     51.137 s ±  0.183 s    [User: 234.165 s, System: 15.005 s]
      Range (min … max):   50.934 s … 51.288 s    3 runs

    Benchmark 2: CC="zig c++ -target x86_64-linux-gnu.2.28" /code/go/bin/go1.19-O2 build .
      Time (mean ± σ):     27.102 s ±  0.068 s    [User: 119.816 s, System: 8.513 s]
      Range (min … max):   27.038 s … 27.174 s    3 runs

    Summary
      '/code/go/bin/go1.19-O2 build .' ran
        1.89 ± 0.01 times faster than '/code/go/bin/go1.19 build .'

The difference is just due to the fact that Zig will not be instructed
to compile libc++.a for debug builds; Go doesn't need that.

Non-Zig performance impact
--------------------------

A.k.a. does "-O2" for this check worsen performance?

No statistically significant performance differences with both clang-15
and gcc-11. Also, it affects only the first compile of a CGo progam, as
the linker tests are cached across invocations. go1.19 binary is the
go1.19 tag; go1.19-O2 is go1.19 + this patch.

    $ hyperfine --warmup 3 --runs 20 \
        --prepare 'rm -fr ~/.cache/go-build/ /tmp/go-*' \
        --parameter-list go go1.19,go1.19-O2 \
        --parameter-list cc gcc-11,clang-15 \
        'CC={cc} /code/go/bin/{go} build .'
    Benchmark 1: CC=gcc-11 /code/go/bin/go1.19 build .
      Time (mean ± σ):     681.1 ms ±  13.7 ms    [User: 501.6 ms, System: 247.1 ms]
      Range (min … max):   654.1 ms … 707.2 ms    20 runs

    Benchmark 2: CC=gcc-11 /code/go/bin/go1.19-O2 build .
      Time (mean ± σ):     676.8 ms ±  10.2 ms    [User: 500.4 ms, System: 245.6 ms]
      Range (min … max):   664.4 ms … 696.4 ms    20 runs

    Benchmark 3: CC=clang-15 /code/go/bin/go1.19 build .
      Time (mean ± σ):     860.1 ms ±  17.1 ms    [User: 530.0 ms, System: 394.9 ms]
      Range (min … max):   839.4 ms … 920.0 ms    20 runs

    Benchmark 4: CC=clang-15 /code/go/bin/go1.19-O2 build .
      Time (mean ± σ):     864.5 ms ±  26.6 ms    [User: 537.8 ms, System: 390.1 ms]
      Range (min … max):   841.9 ms … 955.5 ms    20 runs
    Summary
      'CC=gcc-11 /code/go/bin/go1.19-O2 build .' ran
        1.01 ± 0.03 times faster than 'CC=gcc-11 /code/go/bin/go1.19 build .'
        1.27 ± 0.03 times faster than 'CC=clang-15 /code/go/bin/go1.19 build .'
        1.28 ± 0.04 times faster than 'CC=clang-15 /code/go/bin/go1.19-O2 build .'

cgo.go
------

    package main

    // #define _FILE_OFFSET_BITS 64
    // #include <unistd.h>
    // #include <fcntl.h>
    // #include <stdio.h>
    // char* hello() { return "hello, world"; }
    // void phello() { printf("%s, your lucky number is %p\n", hello(), fcntl); }
    import "C"

    func main() {
            C.phello()
    }

    func Chello() string {
            return C.GoString(C.hello())
    }

Alternatives considered
-----------------------

There are a few alternatives:

1. Add "-O2" for linker-only tests. That looks like too much catering to
   zig alone. If we can add it, then add for everything.
2. Add "-fomit-frame-pointer" instead of "-O2". This flag does not
   universally imply debug mode, thus same argument applies as to (1).
3. Add "-O2" for this particular test (`--no-gc-sections`). This is
   brittle and not future-proof: a future linker test may omit this
   flag.

Hardware
--------

Tested on a 4-core (8 HT) Intel(R) Core(TM) i7-8665U CPU on Debian 11,
Linux 5.10.0-15-amd64.

[1]: https://andrewkelley.me/post/zig-cc-powerful-drop-in-replacement-gcc-clang.html

Change-Id: I5223a5cf53fc5d2b77ac94a6c5712c32c7fbdf36
GitHub-Last-Rev: 2e998b831a
GitHub-Pull-Request: golang/go#55966
Reviewed-on: https://go-review.googlesource.com/c/go/+/436884
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2022-10-08 16:45:06 +00:00
Zeke Lu
28a05f541d cmd/go/internal/modload: improve error message for failing to read module listed in go.work
Run "go build ./x" in this workspace:

  -- go.work --
  use ./y
  -- x/go.mod --
  module x

  go 1.19
  -- x/m.go --
  package m

It fails with: "go: open /tmp/foo/y/go.mod: no such file or directory".
It's unclear where the name "y" comes from.
This change will emit error like: "go: cannot load module listed in
go.work file: open /tmp/foo/y/go.mod: no such file or directory"

Fixes #55952.

Change-Id: Ia45dd915e3fbd6e33340f352b3d6235c6c31190b
GitHub-Last-Rev: 410de1b4a7
GitHub-Pull-Request: golang/go#56050
Reviewed-on: https://go-review.googlesource.com/c/go/+/438147
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2022-10-08 09:29:15 +00:00
Ian Lance Taylor
4fe1971b2d os: use poll.fdMutex for Plan 9 files
This permits us to safely support concurrent access to files on Plan 9.
Concurrent access was already safe on other systems.

This does introduce a change: if one goroutine calls a blocking read
on a pipe, and another goroutine closes the pipe, then before this CL
the close would occur. Now the close will be delayed until the blocking
read completes.

Also add tests that concurrent I/O and Close on a pipe are OK.

For #50436
For #56043

Change-Id: I969c869ea3b8c5c2f2ef319e441a56a3c64e7bf5
Reviewed-on: https://go-review.googlesource.com/c/go/+/438347
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: David du Colombier <0intro@gmail.com>
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2022-10-08 03:57:40 +00:00
eric fang
669ec549b5 cmd/compile: enable carry chain scheduling for arm64
This is a follow up of CL 393656 on arm64.

This CL puts ScoreCarryChainTail before ScoreMemory and after
ScoreReadFlags, so that the scheduling of the carry chain will not
break the scheduling of ScoreVarDef.

Benchmarks:
name                                  old time/op    new time/op    delta
ScalarMult/P256-8                       42.0µs ± 0%    42.0µs ± 0%   -0.13%  (p=0.032 n=5+5)
ScalarMult/P224-8                        135µs ± 0%      96µs ± 0%  -29.04%  (p=0.008 n=5+5)
ScalarMult/P384-8                        573µs ± 1%     355µs ± 0%  -38.05%  (p=0.008 n=5+5)
ScalarMult/P521-8                       1.50ms ± 4%    0.77ms ± 0%  -48.78%  (p=0.008 n=5+5)
MarshalUnmarshal/P256/Uncompressed-8     505ns ± 1%     506ns ± 0%     ~     (p=0.460 n=5+5)
MarshalUnmarshal/P256/Compressed-8      6.75µs ± 0%    6.73µs ± 0%   -0.27%  (p=0.016 n=5+5)
MarshalUnmarshal/P224/Uncompressed-8     927ns ± 0%     818ns ± 0%  -11.76%  (p=0.008 n=5+5)
MarshalUnmarshal/P224/Compressed-8       136µs ± 0%      96µs ± 0%  -29.58%  (p=0.008 n=5+5)
MarshalUnmarshal/P384/Uncompressed-8    1.77µs ± 0%    1.36µs ± 1%  -23.14%  (p=0.008 n=5+5)
MarshalUnmarshal/P384/Compressed-8      56.5µs ± 0%    31.9µs ± 0%  -43.59%  (p=0.016 n=5+4)
MarshalUnmarshal/P521/Uncompressed-8    2.91µs ± 0%    2.03µs ± 1%  -30.32%  (p=0.008 n=5+5)
MarshalUnmarshal/P521/Compressed-8       148µs ± 0%      68µs ± 1%  -54.28%  (p=0.008 n=5+5)

Change-Id: I4bf4e3265d7e1ee85765ff2bf006ca5a794d4979
Reviewed-on: https://go-review.googlesource.com/c/go/+/432275
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
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Reviewed-by: Keith Randall <khr@golang.org>
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2022-10-08 01:46:00 +00:00
Jeremy Brewer
40c7e94cc5 modload: provide a clearer error for standard library packages from newer releases
An older version of go compiling a main module that references a
standard library package from a newer release (e.g. net/netip added in
go 1.18) currently produces a confusing error message. This changes adds
a new error message including go version diagnostics.

Fixes #48966

Change-Id: I1e8319dafcf1f67d1b1ca869fe84190c3b3f3c3e
Reviewed-on: https://go-review.googlesource.com/c/go/+/432075
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2022-10-07 20:20:51 +00:00
Bryan C. Mills
9be09916d9 cmd/go/internal/modload: remove the needSum argument from the fetch function
With moduleHasRootPackage eliminated in the previous CL, needSum is
now invariantly true at all call sites.

Change-Id: I00e44117e545ea0d3de82604dfa018b013ab8f0c
Reviewed-on: https://go-review.googlesource.com/c/go/+/440296
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2022-10-07 18:28:14 +00:00
Andrew Pogrebnoy
c7cc2b94c6 runtime: move epoll syscalls to runtime/internal/syscall
This change moves Linux epoll's syscalls implementation to the
"runtime/internal/syscall" package. The intention in this CL was to
minimise behavioural changes but make the code more generalised. This
also will allow adding new syscalls (like epoll_pwait2) without the
need to implement assembly stubs for each arch.

It also drops epoll_create as not all architectures provide this call.
epoll_create1 was added to the kernel in version 2.6.27 and Go requires
Linux kernel version 2.6.32 or later since Go 1.18. So it is safe to
always use epoll_create1.

This is a resubmit as the previous CL 421994 was reverted due to test
failures after the merge with the master. The issue was fixed in
CL 438615

For #53824
For #51087

Change-Id: I1bd0f23a85b4f9b80178c5dd36fd3e95ff4f9648
Reviewed-on: https://go-review.googlesource.com/c/go/+/440115
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2022-10-07 18:28:11 +00:00
Bryan C. Mills
67cd77b88f cmd/go/internal/modload: remove unused moduleHasRootPackage function
Change-Id: Iaf118150b8cf48aa42db3477bffdb92bd39f632a
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2022-10-07 18:27:19 +00:00
Wayne Zuo
90a3527427 cmd/compile: intrinsify Sub64 on loong64
This is a follow up of CL 420095  on loong64.

file                                    before    after     Δ       %
compile/internal/ssa.a                  35649482  35653274  +3792   +0.011%
compile/internal/ssagen.a               4099858   4098728   -1130   -0.028%
ecdh.a                                  227896    226896    -1000   -0.439%
internal/nistec/fiat.a                  1212254   1128184   -84070  -6.935%
tls.a                                   3256800   3256802   +2      +0.000%
big.a                                   1708518   1702496   -6022   -0.352%
bits.a                                  106762    105734    -1028   -0.963%
math.a                                  578762    577288    -1474   -0.255%
netip.a                                 555922    555610    -312    -0.056%
net.a                                   3286528   3286530   +2      +0.000%
golang.org/x/crypto/internal/poly1305.a 109546    107686    -1860   -1.698%
total                                   260392768 260299668 -93100  -0.036%

Change-Id: Ieffca705aae5666501f284502d986ca179dde494
Reviewed-on: https://go-review.googlesource.com/c/go/+/428557
Reviewed-by: Carlos Amedee <carlos@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
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2022-10-07 18:16:26 +00:00
Wayne Zuo
97760ed651 cmd/compile: intrinsify Add64 on loong64
This is a follow up of CL 420094  on loong64.

Reduce go toolchain size slightly on linux/loong64.

compilecmp HEAD~1 -> HEAD
HEAD~1 (8a32354219): internal/trace: use strings.Builder
HEAD (1767784ac3): cmd/compile: intrinsify Add64 on loong64
platform: linux/loong64

file      before    after     Δ       %
addr2line 3882616   3882536   -80     -0.002%
api       5528866   5528450   -416    -0.008%
asm       5133780   5133796   +16     +0.000%
cgo       4668787   4668491   -296    -0.006%
compile   25163409  25164729  +1320   +0.005%
cover     4658055   4658007   -48     -0.001%
dist      3437783   3437727   -56     -0.002%
doc       3883069   3883205   +136    +0.004%
fix       3383254   3383070   -184    -0.005%
link      6747559   6747023   -536    -0.008%
nm        3793923   3793939   +16     +0.000%
objdump   4256628   4256812   +184    +0.004%
pack      2356328   2356144   -184    -0.008%
pprof     14233370  14131910  -101460 -0.713%
test2json 2638668   2638476   -192    -0.007%
trace     13392065  13360781  -31284  -0.234%
vet       7456388   7455588   -800    -0.011%
total     132498256 132364392 -133864 -0.101%

file                                    before    after     Δ       %
compile/internal/ssa.a                  35644590  35649482  +4892   +0.014%
compile/internal/ssagen.a               4101250   4099858   -1392   -0.034%
internal/edwards25519/field.a           226064    201718    -24346  -10.770%
internal/nistec/fiat.a                  1689922   1212254   -477668 -28.266%
tls.a                                   3256798   3256800   +2      +0.000%
big.a                                   1718552   1708518   -10034  -0.584%
bits.a                                  107786    106762    -1024   -0.950%
cmplx.a                                 169434    168214    -1220   -0.720%
math.a                                  581302    578762    -2540   -0.437%
netip.a                                 556096    555922    -174    -0.031%
net.a                                   3286526   3286528   +2      +0.000%
runtime.a                               8644786   8644510   -276    -0.003%
strconv.a                               519098    518374    -724    -0.139%
golang.org/x/crypto/internal/poly1305.a 115398    109546    -5852   -5.071%
total                                   260913122 260392768 -520354 -0.199%

Change-Id: I75b2bb7761fa5a0d0d032d4ebe3582d092ea77be
Reviewed-on: https://go-review.googlesource.com/c/go/+/428556
Reviewed-by: Carlos Amedee <carlos@golang.org>
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: David Chase <drchase@google.com>
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2022-10-07 18:16:10 +00:00
Tobias Klauser
c4674e0134 net/netip: add test for AddrFromSlice
AddrFromSlice is not covered by any other test so far.

Change-Id: I91034c6cac95a023fc419c855873a395b1afdab7
Reviewed-on: https://go-review.googlesource.com/c/go/+/435916
Reviewed-by: Carlos Amedee <carlos@golang.org>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Damien Neil <dneil@google.com>
2022-10-07 17:54:18 +00:00