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Commit Graph

55524 Commits

Author SHA1 Message Date
Changkun Ou
f07910bd57 sync: document memory model for Swap/CompareAnd{Swap,Delete} in Map
CL 381316 documented the memory model of Map's APIs. However, the newly
introduced Swap, CompareAndSwap, and CompareAndDelete are missing from
this documentation as CL 399094 did not add this info.

This CL specifies the defined read/write operations of the new Map APIs.

For #51972

Change-Id: I519a04040a0b429a3f978823a183cd62e42c90ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/459715
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Changkun Ou <mail@changkun.de>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
2023-01-20 19:38:29 +00:00
Robert Griesemer
5724daa682 go/types, types2: use go.dev/issue/nnnnn when referring to an issue (cleanup)
Apply the following regex substitutions, in order:

golang/go#(\d+)  =>  go.dev/issue/$1
issue #?(\d+)    =>  go.dev/issue/$1

Providing a link uniformly makes it easier to find the respective issue.

Change-Id: I9b60ffa1adb95be181f6711c2f171be3afe2b315
Reviewed-on: https://go-review.googlesource.com/c/go/+/462856
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
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2023-01-20 18:13:03 +00:00
Robert Griesemer
4b23068712 types2: add *Config to typecheck functions for tests, factor more code
Some tests in go/types can still not use the typecheck helper functions
because they need a specific fileset for position information.

(We could use a single global file set for all tests to make this work.)

Change-Id: I73552b08a00f08d809c319d3d2328acee9532619
Reviewed-on: https://go-review.googlesource.com/c/go/+/461694
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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Reviewed-by: Robert Findley <rfindley@google.com>
2023-01-20 18:13:01 +00:00
Robert Griesemer
e38cb25b33 go/types: generate instantiate.go
Change-Id: Iad8b78bbf52eb2b0de05471bfd5a5506dc45e055
Reviewed-on: https://go-review.googlesource.com/c/go/+/461693
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
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2023-01-20 18:12:59 +00:00
Robert Griesemer
2507e7897b go/types: provision for generating initorder.go, but disabled for now
Add the code to generate initorder.go but do not enable the generation
of that file for now because the generated  use uses error_ which has
implications for gopls use (error_ produces a single error instead of
pultiple \t-indented follow-on errors).

Change-Id: I5cd8acdeb8845dbb4716f19cf90d88191dd4216c
Reviewed-on: https://go-review.googlesource.com/c/go/+/461692
Reviewed-by: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
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Reviewed-by: Robert Griesemer <gri@google.com>
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2023-01-20 18:12:57 +00:00
Dmitri Shuralyov
1011ccad5c cmd/dist: mark linux/sparc64 as a broken port, remove incomplete map
The linux/sparc64 port is incomplete—it doesn't work, and it doesn't
have a builder. Now that dist supports broken ports, mark it as such.

The incomplete map was created to hide ports that aren't functional
from dist list output. Now that we have the broken port concept, it
seems largely redundant, so remove it for now.

For #56679.
Updates #28944.

Change-Id: I34bd23e913ed6d786a4d0aa8d2852f2b926fe4b6
Reviewed-on: https://go-review.googlesource.com/c/go/+/458516
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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2023-01-20 17:52:28 +00:00
Dmitri Shuralyov
399ad79fa6 cmd/dist: add map of broken ports and -force flag
It's empty so far. The next CL adds linux/sparc64.

Also add -force flag to the bootstrap.bash script
so that it's possible to use it with broken ports.

For #56679.

Change-Id: I09c733d0df0a68df34fb808eae29be010a6da461
Reviewed-on: https://go-review.googlesource.com/c/go/+/458515
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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2023-01-20 17:52:26 +00:00
Dmitri Shuralyov
e7495d8737 cmd/dist: remove GOTESTONLY environment variable
This hook was added for the Go build system (x/build) to be able to set
the run flag value, but it's no longer used anywhere. Remove it for now.

Updates #46054.

Change-Id: I64e7d68d2b270303f3bd54f73079600f209e350a
Reviewed-on: https://go-review.googlesource.com/c/go/+/455519
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
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2023-01-20 17:47:38 +00:00
Dmitri Shuralyov
09d852ceac cmd/dist: remove hardcoded timeout scale for arm and mips{,le,64,64le}
Fixes #57117.

Change-Id: If36da5b138a5e92e27688719ffc1c4dafd590957
Reviewed-on: https://go-review.googlesource.com/c/go/+/455518
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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2023-01-20 17:47:35 +00:00
Anit Gandhi
62a994837a crypto/tls: improve client auth failure alerts
This change makes it easier for clients to debug mutual TLS connection failures. Currently, there are a few situations where invalid client auth leads to a generic "bad certificate" alert. 3 specific situations have a more appropriate TLS alert code, based on the alert descriptions in the appendix of both RFC5246 and RFC8446.
  1. The server is configured to require client auth, but no client cert was provided; the appropriate alert is "certificate required". This applies only to TLS 1.3, which first defined the certificate_required alert code.
  2. The client provided a cert that was signed by an authority that is not in the server's trusted set of CAs; the appropriate alert is "unknown certificate authority".
  3. The client provided an expired (or not yet valid) cert; the appropriate alert is "expired certificate".
Otherwise, we still fall back to "bad certificate".

Fixes #52113

Change-Id: I7d5860fe911cad8a1615f16bfe488a37e936dc36
GitHub-Last-Rev: 34eeab587b
GitHub-Pull-Request: golang/go#53251
Reviewed-on: https://go-review.googlesource.com/c/go/+/410496
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Run-TryBot: Roland Shoemaker <roland@golang.org>
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Reviewed-by: Roland Shoemaker <roland@golang.org>
2023-01-20 16:19:42 +00:00
Ian Lance Taylor
8b79c41dd5 cmd/go: update test for change in panic(nil) behavior
panic(nil) now panics with runtime.PanicNilError.

For #25448

Change-Id: I58994aa80d4d11f0c5fcd988714f7b4b45c6b5ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/462293
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
2023-01-20 15:49:29 +00:00
Daniel Martí
c641d48afd go/types: use internal/lazyregexp for goVersionRx
With benchinit, we see a noticeable improvement in init times:

	name     old time/op    new time/op    delta
	GoTypes    83.4µs ± 0%    43.7µs ± 1%  -47.57%  (p=0.029 n=4+4)

	name     old alloc/op   new alloc/op   delta
	GoTypes    26.5kB ± 0%    18.8kB ± 0%  -29.15%  (p=0.029 n=4+4)

	name     old allocs/op  new allocs/op  delta
	GoTypes       238 ± 0%       154 ± 0%  -35.29%  (p=0.029 n=4+4)

Port the same change to cmd/compile/internal/types and types2.

Updates #26775.

Change-Id: Ia1f7c4a4ce9a22d66e2aa9c9b9c341036993adca
Reviewed-on: https://go-review.googlesource.com/c/go/+/460544
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2023-01-20 09:35:03 +00:00
Daniel Martí
8259ac4986 encoding/gob: shave off some init time cost
Avoid unnecessary allocations when calling reflect.TypeOf;
we can use nil pointers, which fit into an interface without allocating.
This saves about 1% of CPU time.

The builtin types are limited to typeIds between 0 and firstUserId,
and since firstUserId is 64, builtinIdToType does not need to be a map.
We can simply use an array of length firstUserId, which is simpler.
This saves about 1% of CPU time.

idToType is similar to firstUserId in that it is a map keyed by typeIds.
The difference is that it can grow with the user's types.
However, each added type gets the next available typeId,
meaning that we can use a growing slice, similar to the case above.
nextId then becomes the current length of the slice.
This saves about 1% of CPU time.

typeInfoMap is stored globally as an atomic.Value,
where each modification loads the map, makes a whole copy,
adds the new element, and stores the modified copy.
This is perfectly fine when the user registers types,
as that can happen concurrently and at any point in the future.

However, during init time, we sequentially register many types,
and the overhead of copying maps adds up noticeably.
During init time, use a regular global map instead,
which gets replaced by the atomic.Value when our init work is done.
This saves about 2% of CPU time.

Finally, avoid calling checkId in bootstrapType;
we have just called setTypeId, whose logic for getting nextId is simple,
so the extra check doesn't gain us much.
This saves about 1% of CPU time.

Using benchinit, which transforms GODEBUG=inittrace=1 data into Go
benchmark compatible output, results in a nice improvement:

	name         old time/op    new time/op    delta
	EncodingGob     175µs ± 0%     162µs ± 0%  -7.45%  (p=0.016 n=5+4)

	name         old alloc/op   new alloc/op   delta
	EncodingGob    39.0kB ± 0%    36.1kB ± 0%  -7.35%  (p=0.016 n=5+4)

	name         old allocs/op  new allocs/op  delta
	EncodingGob       588 ± 0%       558 ± 0%  -5.10%  (p=0.000 n=5+4)

Updates #26775.

Change-Id: I28618e8b96ef440480e666ef2cd5c4a9a332ef21
Reviewed-on: https://go-review.googlesource.com/c/go/+/460543
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Rob Pike <r@golang.org>
Run-TryBot: Rob Pike <r@golang.org>
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2023-01-20 09:34:41 +00:00
Daniel Martí
f53137f95c internal/profile: use internal/lazyregexp for the legacy parser
Per benchinit, this makes a big difference to init times:

	name             old time/op    new time/op    delta
	InternalProfile     185µs ± 1%       6µs ± 1%  -96.51%  (p=0.008 n=5+5)

	name             old alloc/op   new alloc/op   delta
	InternalProfile     101kB ± 0%       4kB ± 0%  -95.72%  (p=0.008 n=5+5)

	name             old allocs/op  new allocs/op  delta
	InternalProfile       758 ± 0%        25 ± 0%  -96.70%  (p=0.008 n=5+5)

The fixed 0.2ms init cost is saved for any importer of net/http/pprof,
but also for cmd/compile, as it supports PGO now.
A Go program parsing profiles might not even need to compile these
regular expressions at all, if it doesn't encounter any legacy files.
I suspect this will be the case with most invocations of cmd/compile.

Updates #26775.

Change-Id: I8374dc64459f0b6bb09bbdf9d0b6c55d7ae1646e
Reviewed-on: https://go-review.googlesource.com/c/go/+/460545
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2023-01-20 09:27:47 +00:00
Daniel Martí
1bef0707a5 cmd/link: use strings.LastIndexByte to fix a TODO
Go 1.20 will require Go 1.17 to bootstrap, so we can stop worrying about
older Go bootstrap versions. https://go.dev/issues/44505 fixed most of
those TODOs, but this one was presumably forgotten about.

Change-Id: I0c19ec4eec65cd807e7db9a57c5969845d915c07
Reviewed-on: https://go-review.googlesource.com/c/go/+/461155
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
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2023-01-20 09:27:21 +00:00
Jakub Ciolek
8354f6b5bb cmd/compile: use a boolean as a avoid clobbering flags mov marker
The Value type implements Aux interface because it is being used as a
"avoid clobbering flags" marker by amd64, x86 and s390x SSA parts.

Create a boolean that implements the Aux interface. Use it as the marker
instead. We no longer need Value to implement Aux.

Resolves a TODO.

See CL 275756 for more info.

Change-Id: I8a1eddf7e738b8aa31e82f3c4c590bafd2cdc56b
Reviewed-on: https://go-review.googlesource.com/c/go/+/461156
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Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
2023-01-20 05:01:15 +00:00
Srinivas Pokala
3e77efc720 cmd/internal/obj/s390x, runtime: fix breakpoint in s390x
Currently runtime.Breakpoint generates SIGSEGV in s390x.
The solution to this is add new asm instruction BRRK of
type FORMAT_E for the breakpoint exception.

Fixes #52103

Change-Id: I8358a56e428849a5d28d5ade141e1d7310bee084
Reviewed-on: https://go-review.googlesource.com/c/go/+/457456
Reviewed-by: Keith Randall <khr@golang.org>
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2023-01-20 05:00:12 +00:00
Jorropo
5c67ebbb31 cmd/compile: AMD64v3 remove unnecessary TEST comparision in isPowerOfTwo
With GOAMD64=V3 the canonical isPowerOfTwo function:
  func isPowerOfTwo(x uintptr) bool {
    return x&(x-1) == 0
  }

Used to compile to:
  temp := BLSR(x) // x&(x-1)
  flags = TEST(temp, temp)
  return flags.zf

However the blsr instruction already set ZF according to the result.
So we can remove the TEST instruction if we are just checking ZF.
Such as in multiple pieces of code around memory allocations.

This make the code smaller and faster.

Change-Id: Ia12d5a73aa3cb49188c0b647b1eff7b56c5a7b58
Reviewed-on: https://go-review.googlesource.com/c/go/+/448255
Run-TryBot: Jakub Ciolek <jakub@ciolek.dev>
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2023-01-20 04:58:59 +00:00
Jorropo
fc814056aa cmd/compile: rewrite empty makeslice to zerobase pointer
make\(\[\][a-zA-Z0-9]+, 0\) is seen 52 times in the go source.
And at least 391 times on internet:
https://grep.app/search?q=make%5C%28%5C%5B%5C%5D%5Ba-zA-Z0-9%5D%2B%2C%200%5C%29&regexp=true
This used to compile to calling runtime.makeslice.
However we can copy what we do for []T{}, just use a zerobase pointer.

On my machine this is 10x faster (from 3ns to 0.3ns).
Note that an empty loop also runs in 0.3ns,
so this really is free when you count superscallar execution.

Change-Id: I1cfe7e69f5a7a4dabbc71912ce6a4f8a2d4a7f3c
Reviewed-on: https://go-review.googlesource.com/c/go/+/454036
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@google.com>
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2023-01-20 04:57:35 +00:00
liu-xuewen
57236fe9f7 runtime: remove 104 byte stack guard
The number 104 appears to date back to the
first implementation of split stacks in
https://go.googlesource.com/go/+/b987f7a757f53f460973622a36eebb696f9b5060.
That change introduces a 104 byte stack guard.
it doesn't makes any sense today.

Change-Id: I73069f6d1a827653af63e616f0119fbac809882e
GitHub-Last-Rev: bcf9000590
GitHub-Pull-Request: golang/go#56594
Reviewed-on: https://go-review.googlesource.com/c/go/+/448036
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Reviewed-by: Keith Randall <khr@google.com>
2023-01-20 04:55:48 +00:00
Keith Randall
12befc3ce3 cmd/compile: improve scheduling pass
Convert the scheduling pass from scheduling backwards to scheduling forwards.

Forward scheduling makes it easier to prioritize scheduling values as
soon as they are ready, which is important for things like nil checks,
select ops, etc.

Forward scheduling is also quite a bit clearer. It was originally
backwards because computing uses is tricky, but I found a way to do it
simply and with n lg n complexity. The new scheme also makes it easy
to add new scheduling edges if needed.

Fixes #42673
Update #56568

Change-Id: Ibbb38c52d191f50ce7a94f8c1cbd3cd9b614ea8b
Reviewed-on: https://go-review.googlesource.com/c/go/+/270940
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2023-01-20 04:54:01 +00:00
Marcel Meyer
b419db6c15 all: fix typos in go file comments
This is the second round to look for spelling mistakes. This time the
manual sifting of the result list was made easier by filtering out
capitalized and camelcase words.

grep -r --include '*.go' -E '^// .*$' . | aspell list | grep -E -x '[A-Za-z]{1}[a-z]*' | sort | uniq

This PR will be imported into Gerrit with the title and first
comment (this text) used to generate the subject and body of
the Gerrit change.

Change-Id: Ie8a2092aaa7e1f051aa90f03dbaf2b9aaf5664a9
GitHub-Last-Rev: fc2bd6e0c5
GitHub-Pull-Request: golang/go#57737
Reviewed-on: https://go-review.googlesource.com/c/go/+/461595
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2023-01-20 03:27:26 +00:00
Robert Griesemer
f52b8fa83f go/types: generate infer.go
Also, remove pos parameter from inferB (was unused).

Change-Id: I050f64d9fe916628499a55ca46f15c1f58ed4d1d
Reviewed-on: https://go-review.googlesource.com/c/go/+/461691
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2023-01-20 01:31:26 +00:00
Robert Griesemer
cf9adf4a3e cmd/compile/internal/types2: remove useConstraintTypeInference flg (cleanup)
This useConstraintTypeInference flag was debugging purposes only and
is not needed anymore. It's already gone in go/types.

Also, adjust/fix some comments.

Change-Id: I713be5759f05c618fcf26e16cf53dfb3626bba93
Reviewed-on: https://go-review.googlesource.com/c/go/+/461690
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2023-01-20 01:31:24 +00:00
fangguizhen
e590afcf2c bytes, strings: rename field in CutSuffix tests
Change-Id: I63181f6540fc1bfcfc988a16bf9fafbd3575cfdf
GitHub-Last-Rev: d90528730a
GitHub-Pull-Request: golang/go#57909
Reviewed-on: https://go-review.googlesource.com/c/go/+/462284
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2023-01-20 01:25:45 +00:00
Alice
ae400d003f misc/cgo/testsanitizers: use fmt.Printf instead fmt.Println
Change-Id: Ie46bc3cbfb2622b5eb70618557ff5398866f5607
GitHub-Last-Rev: a665ef84dd
GitHub-Pull-Request: golang/go#57813
Reviewed-on: https://go-review.googlesource.com/c/go/+/462044
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2023-01-20 01:23:37 +00:00
fangguizhen
f33e8f6698 time: no need to wrap error with errors.New
Change-Id: Ibd519ed6419f8f21c89a111a0326d0788aca9d19
GitHub-Last-Rev: 45e3224f9a
GitHub-Pull-Request: golang/go#57819
Reviewed-on: https://go-review.googlesource.com/c/go/+/462046
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Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
2023-01-20 01:07:08 +00:00
Damien Neil
045b33ecfe net/http: close Request.Body when pconn write loop exits early
The pconn write loop closes a request's body after sending the
request, but in the case where the write loop exits with an
unsent request in writech the body is never closed.

Close the request body in this case.

Fixes #49621

Change-Id: Id94a92937bbfc0beb1396446f4dee32fd2059c7e
Reviewed-on: https://go-review.googlesource.com/c/go/+/461675
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Damien Neil <dneil@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2023-01-20 01:06:03 +00:00
Ian Lance Taylor
78558d5e10 archive/zip: use base offset 0 if it has a valid entry
In CL 408734 we introduced a fall back to base offset 0 if reading a
directory entry at the computed base offset failed. We have now found
a file in the wild for which the computed base offset is incorrect,
but happens to refer to a valid directory entry. In this CL, we change
the fallback such that if the first directory header relative to base
offset 0 is valid, we just use base offset 0.

Change-Id: Ia9ace20c1065d1f651035f16f7d91d741ab1dbf4
Reviewed-on: https://go-review.googlesource.com/c/go/+/461598
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Run-TryBot: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
2023-01-20 01:04:11 +00:00
Wayne Zuo
5454834f01 cmd/internal/obj/riscv: add check for invalid shift amount input
Current RISCV64 assembler do not check the invalid shift amount. This CL
adds the check to avoid generating invalid instructions.

Fixes #57755

Change-Id: If33877605e161baefd98c50db1f71641ca057507
Reviewed-on: https://go-review.googlesource.com/c/go/+/461755
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Than McIntosh <thanm@google.com>
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2023-01-19 23:30:35 +00:00
Keith Randall
45dc81d856 cmd/compile: add memory argument to GetCallerSP
We need to make sure that when we get the stack pointer, we get it
at the right time.

V = GetCallerSP
Call()
W = GetCallerSP

If Call causes a stack growth, then we will be in a situation
where V != W. So it matters when GetCallerSP operations get scheduled.
Add a memory argument to GetCallerSP so it can't be reordered with
things like calls.

Change-Id: I6cc801134c38e358c5a1ec0c09d38379a16a4184
Reviewed-on: https://go-review.googlesource.com/c/go/+/453515
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Martin Möhrmann <martin@golang.org>
Reviewed-by: Robert Griesemer <gri@google.com>
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2023-01-19 22:43:22 +00:00
Dmitri Shuralyov
440ef8c4d2 cmd/internal/osinfo: report Node.js version
Seeing the Node.js version that was used during a particular test run
should be helpful during the upcoming migration from Node.js 14 to 18.
Add minimal support for that.

For golang/go#57614.

Change-Id: Id55ba25a7ee4a803788316d4a646cd4b6f4297e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/460655
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Richard Musiol <neelance@gmail.com>
Reviewed-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
2023-01-19 22:43:17 +00:00
Keith Randall
f959fb3872 cmd/compile: add anchored version of SP
The SPanchored opcode is identical to SP, except that it takes a memory
argument so that it (and more importantly, anything that uses it)
must be scheduled at or after that memory argument.

This opcode ensures that a LEAQ of a variable gets scheduled after the
corresponding VARDEF for that variable.

This may lead to less CSE of LEAQ operations. The effect is very small.
The go binary is only 80 bytes bigger after this CL. Usually LEAQs get
folded into load/store operations, so the effect is only for pointerful
types, large enough to need a duffzero, and have their address passed
somewhere. Even then, usually the CSEd LEAQs will be un-CSEd because
the two uses are on different sides of a function call and the LEAQ
ends up being rematerialized at the second use anyway.

Change-Id: Ib893562cd05369b91dd563b48fb83f5250950293
Reviewed-on: https://go-review.googlesource.com/c/go/+/452916
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Martin Möhrmann <martin@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
2023-01-19 22:43:12 +00:00
Dmitri Shuralyov
47a0d46716 cmd/compile/internal/ssa: generate code via a //go:generate directive
The standard way to generate code in a Go package is via //go:generate
directives, which are invoked by the developer explicitly running:

	go generate import/path/of/said/package

Switch to using that approach here.

This way, developers don't need to learn and remember a custom way that
each particular Go package may choose to implement its code generation.
It also enables conveniences such as 'go generate -n' to discover how
code is generated without running anything (this works on all packages
that rely on //go:generate directives), being able to generate multiple
packages at once and from any directory, and so on.

Change-Id: I0e5b6a1edeff670a8e588befeef0c445613803c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/460135
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
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Reviewed-by: Keith Randall <khr@golang.org>
2023-01-19 22:42:34 +00:00
Russ Cox
213495a4a6 internal/godebug: export non-default-behavior counters in runtime/metrics
Allow GODEBUG users to report how many times a setting
resulted in non-default behavior.

Record non-default-behaviors for all existing GODEBUGs.

Also rework tests to ensure that runtime is in sync with runtime/metrics.All,
and generate docs mechanically from metrics.All.

For #56986.

Change-Id: Iefa1213e2a5c3f19ea16cd53298c487952ef05a4
Reviewed-on: https://go-review.googlesource.com/c/go/+/453618
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Russ Cox <rsc@golang.org>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
2023-01-19 22:26:43 +00:00
Russ Cox
aa51c40b1c runtime: replace panic(nil) with panic(new(runtime.PanicNilError))
Long ago we decided that panic(nil) was too unlikely to bother
making a special case for purposes of recover. Unfortunately,
it has turned out not to be a special case. There are many examples
of code in the Go ecosystem where an author has written panic(nil)
because they want to panic and don't care about the panic value.

Using panic(nil) in this case has the unfortunate behavior of
making recover behave as though the goroutine isn't panicking.
As a result, code like:

	func f() {
		defer func() {
			if err := recover(); err != nil {
				log.Fatalf("panicked! %v", err)
			}
		}()
		call1()
		call2()
	}

looks like it guarantees that call2 has been run any time f returns,
but that turns out not to be strictly true. If call1 does panic(nil),
then f returns "successfully", having recovered the panic, but
without calling call2.

Instead you have to write something like:

	func f() {
		done := false
		defer func() {
			if err := recover(); !done {
				log.Fatalf("panicked! %v", err)
			}
		}()
		call1()
		call2()
		done = true
	}

which defeats nearly the whole point of recover. No one does this,
with the result that almost all uses of recover are subtly broken.

One specific broken use along these lines is in net/http, which
recovers from panics in handlers and sends back an HTTP error.
Users discovered in the early days of Go that panic(nil) was a
convenient way to jump out of a handler up to the serving loop
without sending back an HTTP error. This was a bug, not a feature.
Go 1.8 added panic(http.ErrAbortHandler) as a better way to access the feature.
Any lingering code that uses panic(nil) to abort an HTTP handler
without a failure message should be changed to use http.ErrAbortHandler.

Programs that need the old, unintended behavior from net/http
or other packages can set GODEBUG=panicnil=1 to stop the run-time error.

Uses of recover that want to detect panic(nil) in new programs
can check for recover returning a value of type *runtime.PanicNilError.

Because the new GODEBUG is used inside the runtime, we can't
import internal/godebug, so there is some new machinery to
cross-connect those in this CL, to allow a mutable GODEBUG setting.
That won't be necessary if we add any other mutable GODEBUG settings
in the future. The CL also corrects the handling of defaulted GODEBUG
values in the runtime, for #56986.

Fixes #25448.

Change-Id: I2b39c7e83e4f7aa308777dabf2edae54773e03f5
Reviewed-on: https://go-review.googlesource.com/c/go/+/461956
Reviewed-by: Robert Griesemer <gri@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>
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2023-01-19 22:21:50 +00:00
Russ Cox
8d71ae8c77 cmd/go/internal/modindex: remove copy of build.Package
modindex defines its own type Package that must be exactly the
same as build.Package (there are conversions between them).
The normal reason to do this is to provide a different method set,
but there aren't any different methods. And if we needed to do that,
we could write

	type Package build.Package

instead of repeating the struct definition. Remove the type entirely
in favor of direct use of build.Package.

This makes the modindex package not break when fields are
added to go/build.Package.

Change-Id: I8ffe9f8832bbc62be93a72e6a09d807ddbce216b
Reviewed-on: https://go-review.googlesource.com/c/go/+/462255
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Russ Cox <rsc@golang.org>
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2023-01-19 21:42:39 +00:00
Bryan C. Mills
c16c2c49e2 cmd/go: shorten TestScript/test_shuffle and skip it in short mode
test_shuffle was added in CL 310033. It takes about 4½ seconds on my
workstation prior to this CL, most of which is spent linking and
running test binaries in 'go test'.

We can reduce that time somewhat (to 3¾ seconds) by simply running the
test fewer times (cases of 'off', 'on', positive, zero, and negative
values seem sufficient), but we should also avoid that linking
overhead at all in short mode.

Fixes #57709.

Change-Id: I908a70435ccfb1ca16ed23aec17512bf2b267b21
Reviewed-on: https://go-review.googlesource.com/c/go/+/461455
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2023-01-19 20:46:11 +00:00
Bryan C. Mills
2f8f51724a cmd/go/internal/lockedfile: avoid failing tests due to arbitrary timeouts
The mustBlock helper returns a function that verifies that the blocked
operation does eventually complete. However, it used an arbitrary
10-second timeout in place of “eventually”.

Since the test is checking a synchronization library, bugs are likely
to manifest as deadlocks. It may be useful to log what operation is in
flight if such a deadlock occurs; however, since we can't bound how
long a “reasonable” operation should take, the log message should only
be informational — it should not cause the test to fail.

While we're here, let's also set a better example by not leaking
time.After timers in the tests..

Fixes #57592.

Change-Id: I4e74e42390679bffac7a286824acb71b08994c17
Reviewed-on: https://go-review.googlesource.com/c/go/+/461000
Reviewed-by: Damien Neil <dneil@google.com>
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2023-01-19 20:46:09 +00:00
Bryan C. Mills
24a9d7bc18 cmd/go/internal/vcweb: simplify hgHandler cancellation
This uses the new Cancel and WaitDelay fields of os/exec.Cmd
(added in #50436) to interrupt or kill the 'hg serve' command
when its incoming http.Request is canceled.

This should keep the vcweb hg handler from getting stuck if 'hg serve'
hangs after the request either completes or is canceled.

Fixes #57597 (maybe).

Change-Id: I53cf58e8ab953fd48c0c37f596f99e885a036d9b
Reviewed-on: https://go-review.googlesource.com/c/go/+/460997
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
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2023-01-19 20:46:08 +00:00
Bryan C. Mills
e08642cae1 net: delete TestTCPSelfConnect
This test is flaky, apparently due to a typo'd operator in CL 21447
that causes it to compare “same port OR IP” instead of
“same port AND IP”.

If we merely fixed the comparison, the test would hopefully stop being
flaky itself, but we would still be left with another problem:
repeatedly dialing a port that we believe to be unused can interfere
with other tests, which may open the previously-unused port and then
attempt a single Dial and expect it to succeed. Arbitrary other Dial
calls for that port may cause the wrong connection to be accepted,
leading to spurious test failures.

Moreover, the test can be extremely expensive for the amount of data
we hope to get from it, depending on the system's port-reuse
algorithms and dial implementations. It is already scaled back by up
to 1000x on a huge number of platforms due to latency, and may even be
ineffective on those platforms because of the arbitrary 1ms Dial
timeout. And the incremental value from it is quite low, too: it tests
the workaround for what is arguably a bug in the Linux kernel, which
ought to be fixed (and tested) upstream instead of worked around in
every open-source project that dials local ports.

Instead of trying to deflake this test, let's just get rid of it.

Fixes #18290.

Change-Id: I8a58b93d67916a33741c9ab29ef99c49c46b32c4
Reviewed-on: https://go-review.googlesource.com/c/go/+/460657
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2023-01-19 20:46:05 +00:00
Bryan C. Mills
fbf14ae166 runtime: remove arbitrary GOARCH constraints in finalizer tests
These tests were only run on GOARCH=amd64, but the rationale given in
CL 11858043 was GC precision on 32-bit platforms. Today, we have far
more 64-bit platforms than just amd64, and I believe that GC precision
on 32-bit platforms has been substantially improved as well.
The GOARCH restriction seems unnecessary.

Updates #57166.
Updates #5368.

Change-Id: I45c608b6fa721012792c96d4ed94a6d772b90210
Reviewed-on: https://go-review.googlesource.com/c/go/+/456120
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2023-01-19 20:45:58 +00:00
Bryan C. Mills
caf8fb1e82 cmd/go: use Cancel and WaitDelay to terminate test subprocesses
Updates #50436.
Updates #56163.
Fixes #24050.

Change-Id: I1b00eb8fb60e0879f029642b5bad97b2e139fee6
Reviewed-on: https://go-review.googlesource.com/c/go/+/456116
Reviewed-by: Ian Lance Taylor <iant@google.com>
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2023-01-19 20:45:56 +00:00
Bryan C. Mills
e49cb0208b os: clean up tests
- Use testenv.Command instead of exec.Command to try to get more
  useful timeout behavior.

- Parallelize tests that appear not to require global state.
  (And add explanatory comments for a few that are not
  parallelizable for subtle reasons.)

- Consolidate some “Helper” tests with their parent tests.

- Use t.TempDir instead of os.MkdirTemp when appropriate.

- Factor out subtests for repeated test helpers.

For #36107.
Updates #22315.

Change-Id: Ic24b6957094dcd40908a59f48e44c8993729222b
Reviewed-on: https://go-review.googlesource.com/c/go/+/458015
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2023-01-19 20:45:37 +00:00
Bryan C. Mills
f2884bf423 os: deflake TestPipeEOF and TestFifoEOF
- Consolidate the two test bodies as one helper function.
- Eliminate arbitrary timeout.
- Shorten arbitrary sleeps in short mode.
- Simplify goroutines.
- Mark the tests as parallel.

Fixes #36107.
Updates #24164.

Change-Id: I14fe4395963a7256cb6d2d743d348a1ade077d5b
Reviewed-on: https://go-review.googlesource.com/c/go/+/457336
Reviewed-by: Rob Pike <r@golang.org>
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2023-01-19 20:45:34 +00:00
Tobias Klauser
3bb8864e9f net/netip: fix type name in TestNoAllocs sub-test names and comments
netaddr.IP became netip.Addr

Change-Id: Ifa762d0f804c603e6289d63672e4808e75dc36a8
Reviewed-on: https://go-review.googlesource.com/c/go/+/461748
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2023-01-19 20:44:19 +00:00
fangguizhen
b1a1d7f425 cmd/go: fix comment typo
Change-Id: I2a5cfdac31c7ffad36348f76f0e583fbf1b11d95
GitHub-Last-Rev: 8373113fe9
GitHub-Pull-Request: golang/go#57821
Reviewed-on: https://go-review.googlesource.com/c/go/+/462048
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2023-01-19 20:43:45 +00:00
Kevin Parsons
f89badf6b4 make.bat: support existing toolchain paths with spaces
Previously if the default go toolchain (from "where go") contained spaces, then running make.bat would fail.

Fixes it to correctly treat paths with spaces. This is especially useful given that the default Go install path is under "C:\Program Files".

Fixes #57918

Change-Id: Icacf8dd5178b608225f02e4a11a8753d78bed262
GitHub-Last-Rev: 4cd8a790e4
GitHub-Pull-Request: golang/go#57836
Reviewed-on: https://go-review.googlesource.com/c/go/+/462275
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2023-01-19 20:43:23 +00:00
Joe Tsai
9894ded194 time: revert strict parsing of RFC 3339
CL 444277 fixed Time.UnmarshalText and Time.UnmarshalJSON to properly
unmarshal timestamps according to RFC 3339 instead of according
to Go's bespoke time syntax that is a superset of RFC 3339.

However, this change seems to have broken an AWS S3 unit test
that relies on parsing timestamps with single digit hours.
It is unclear whether S3 emits these timestamps in production or
whether this is simply a testing artifact that has been cargo culted
across many code bases. Either way, disable strict parsing for now
and re-enable later with better GODEBUG support.

Updates #54580

Change-Id: Icced2c7f9a6b2fc06bbd9c7e90f90edce24c2306
Reviewed-on: https://go-review.googlesource.com/c/go/+/462286
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2023-01-18 19:59:26 +00:00
Russ Cox
6fcbd0369d cmd: update x/tools to latest internal Go 1.20 branch
Import x/tools as of CL 462596 (070db2996ebe, Jan 18 2022),
to bring in two vet analysis fixes (printf and loopclosure).

For #57911.
Fixes #57903.
Fixes #57904.

Change-Id: I82fe4e9bd56fb8e64394ee8618c155316942a517
Reviewed-on: https://go-review.googlesource.com/c/go/+/462555
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2023-01-18 19:33:46 +00:00