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Commit Graph

4507 Commits

Author SHA1 Message Date
Dmitri Shuralyov
3e10c1ff81 doc/next: improve wording for proposal 67061
For #67061.
For #65614.

Change-Id: I0e324b02537e0d40c2092139d31941a1a85a0e69
Reviewed-on: https://go-review.googlesource.com/c/go/+/592196
Reviewed-by: Roland Shoemaker <roland@golang.org>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Bypass: Dmitri Shuralyov <dmitshur@golang.org>
2024-06-18 01:14:50 +00:00
thepudds
77cc7fbc84 doc/next: add motivation and details links for range-over-func iterators
The "Changes to the language" section at the top of the release notes
will likely ultimately include more explanation about iterators, or at
least, the Go project will likely publish additional introductory
material on iterators on the blog and so on.

As a perhaps temporary step given current interest, this CL updates the
release notes with two additional links for details and motivation.

The new package documentation for the iter package is up-to-date,
precise, and also more accessible than the language spec, while the 2022
pre-proposal GitHub discussion starts with perhaps the most compelling
motivation writeup so far. (We purposefully include "2022" in the text
to help illustrate this was not the result of an overly hasty process).

We also update the target of the existing language spec reference to be
closer to the new material.

For #61405.

Change-Id: I4bc0f99c40f31edfc5c0e635dca5f844b26b6eeb
Reviewed-on: https://go-review.googlesource.com/c/go/+/592935
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
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2024-06-17 22:41:42 +00:00
Robert Griesemer
adc5b559db spec: adjust for-range prose to include iterator functions where missing
Also add a missing table entry to the language versions section in the
appendix.

Fixes #67977.

Change-Id: I1f98abbbcc34a4ff31f390752635435eaf6120b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/592595
TryBot-Bypass: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
2024-06-13 20:48:21 +00:00
Robert Griesemer
8219848c94 spec: allow range-over-func to omit iteration variables
For #65236.

Change-Id: I5a11811cc52467ea4446db29c3f86b119f9b2409
Reviewed-on: https://go-review.googlesource.com/c/go/+/592295
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
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Reviewed-by: Ian Lance Taylor <iant@google.com>
2024-06-13 15:47:54 +00:00
Dmitri Shuralyov
97bc577812 doc/next: improve description of proposal 61308
For #61308.
For #65614.

Change-Id: I36b4f2392075d5a3fb9f53a28bd19b997e7be363
Reviewed-on: https://go-review.googlesource.com/c/go/+/592197
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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2024-06-12 18:56:34 +00:00
Cherry Mui
3622ad9705 doc/next: reword map iterator function notes
The notes don't define identifiers m and seq. Describe in words
instead.

While here, rename 3-structs.md to 4-structs.md.

For #65614.

Change-Id: I6690f552903d1870c70e28673c87ac84b7c5c041
Reviewed-on: https://go-review.googlesource.com/c/go/+/592195
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
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2024-06-12 18:30:46 +00:00
Ian Lance Taylor
ee4a42bd58 net: add GODEBUG=netedns0=0 to disable sending EDNS0 header
It reportedly breaks the DNS server on some modems.

For #6464
For #21160
For #44135
For #51127
For #51153
Fixes #67925

Change-Id: I54a11906159f00246d08a54cc8be7327e9ebfd2c
Reviewed-on: https://go-review.googlesource.com/c/go/+/591995
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Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
2024-06-12 17:31:13 +00:00
Cherry Mui
04b5d13256 doc/next: document GORISCV64 environment variable
For #65614.
Updates #61476.

Change-Id: Id677aa6d2a59366ab75a26f08a383d2d253f270e
Reviewed-on: https://go-review.googlesource.com/c/go/+/591895
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Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
2024-06-11 17:18:52 +00:00
Cherry Mui
1554e87c19 doc/next: document GOARM64 environment variable
For #65614.
Updates #60905.

Change-Id: I2dd9df3c7066357cf06268d918bad3c255b38aed
Reviewed-on: https://go-review.googlesource.com/c/go/+/591875
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
2024-06-11 17:18:41 +00:00
Cherry Mui
816538d517 doc/next: document locking down linkname usages
For #65614.
Updates #67401.

Change-Id: Ib38c134ea7ffc69434c79600ba75185e02809d0f
Reviewed-on: https://go-review.googlesource.com/c/go/+/591898
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2024-06-11 17:18:10 +00:00
Cherry Mui
6165bb11d7 doc/next: resolve a TODO for openbsd/riscv64 port
I think we want to keep the "experimental" as we did before. Also
added "64-bit" to be more specific.

For #65614.

Change-Id: I928d0ba6f1b53efa1f882f81f68bfb2446c7ab42
Reviewed-on: https://go-review.googlesource.com/c/go/+/591896
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
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2024-06-11 16:54:08 +00:00
Cherry Mui
5d759ac902 doc/next: reword linker -bindnow release notes
For #65614.

Change-Id: I1a2a4bc18601526053840a280e0604a8e1028ce6
Reviewed-on: https://go-review.googlesource.com/c/go/+/591899
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2024-06-11 16:47:18 +00:00
Robert Griesemer
7274921681 doc: document new default for GODEBUG gotypesalias setting in release notes
For #65614.

Change-Id: I9487521817348053170da293c01ac55f6e3dcd20
Reviewed-on: https://go-review.googlesource.com/c/go/+/590895
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
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2024-06-05 21:30:00 +00:00
Dmitri Shuralyov
e53d10dc04 doc: mark range-over-func as documented
The language change for the accepted range-over-func proposal #61405
was documented in CL 590616. Remove the corresponding 'TODO' entry.

Also improve formatting slightly, and switch to preferred relative
links. They'll work better in the long term and in more contexts.

While here, also simplify the suggested line to preview release notes
locally: setting the -content='' flag explicitly is no longer required
as of CL 589936.

For #65614.

Change-Id: I6cee951b9ede33900bca48c9f709e3b2c5e87337
Reviewed-on: https://go-review.googlesource.com/c/go/+/590756
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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2024-06-05 19:56:43 +00:00
Ian Lance Taylor
93bbf719a6 doc/next: mention new error on time.Parse timezone overflow
For #65614
For #67470

Change-Id: Iba2f263f8ca1fb10c383e12ff3455aa86b26421d
Reviewed-on: https://go-review.googlesource.com/c/go/+/590795
Commit-Queue: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
2024-06-05 17:30:16 +00:00
Robert Griesemer
f3ae135604 doc: document GOEXPERIMENT=aliastypeparams in release notes
For #65614.

Change-Id: I05b20a80b1163e1d3927c2f763ef6b7d20e6a937
Reviewed-on: https://go-review.googlesource.com/c/go/+/590617
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
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2024-06-05 15:56:51 +00:00
Robert Griesemer
1b07b774c0 doc: document "range-over-func" language change in release notes
For #65614.

Change-Id: Idbbcb6eb57b7294d52b174c1aba74ca7aa1b8efd
Reviewed-on: https://go-review.googlesource.com/c/go/+/590616
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
TryBot-Bypass: Robert Griesemer <gri@google.com>
2024-06-04 23:33:52 +00:00
Robert Griesemer
1724c26142 spec: better examples for range-over-func
For #65237.

Change-Id: Id38747efebd46633f453eadaf68d818064faa778
Reviewed-on: https://go-review.googlesource.com/c/go/+/590396
Reviewed-by: Robert Griesemer <gri@google.com>
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2024-06-04 21:07:21 +00:00
Robert Griesemer
535f81e74e spec: document for range loop over functions
For #61405.
Fixes #65237.

Change-Id: Ia7820c0ef089c828ea7ed3d2802c5185c945290e
Reviewed-on: https://go-review.googlesource.com/c/go/+/589397
TryBot-Bypass: Robert Griesemer <gri@google.com>
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2024-06-04 15:28:33 +00:00
Carlos Amedee
44d06616b5 doc/next: preannounce a new Linux kernel version requirement
This change adds a preannouncement to the release notes. Go 1.24
will require the Linux kernel to be at version 3.17 or later,
with an exception that systems running 3.10 or later will
continue to be supported if the kernel has been patched to
support the getrandom system call.

For #65614
For #67001

Change-Id: I61a3838b9ce4f48eb9f94830aa03372d589afdcd
Reviewed-on: https://go-review.googlesource.com/c/go/+/589015
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
2024-05-30 19:26:10 +00:00
Dmitri Shuralyov
c8cb31a36e doc/next: document proposal 62518 as not relevant
For #65614.

Change-Id: I03dc3a46052f1e55dc1ab46b45c886c96c4a1b39
Reviewed-on: https://go-review.googlesource.com/c/go/+/589216
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
2024-05-30 18:01:58 +00:00
Rhys Hiltner
ca7d300509 Revert "runtime: remove GODEBUG=runtimecontentionstacks"
This reverts commit 87e930f728 (CL 585639)

Reason for revert: This is part of a patch series that changed the
handling of contended lock2/unlock2 calls, reducing the maximum
throughput of contended runtime.mutex values, and causing a performance
regression on applications where that is (or became) the bottleneck.

Updates #66999
Updates #67585

Change-Id: I1e286d2a16d16e4af202cd5dc04b2d9c4ee71b32
Reviewed-on: https://go-review.googlesource.com/c/go/+/589097
Reviewed-by: Than McIntosh <thanm@google.com>
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2024-05-30 17:52:17 +00:00
Michael Matloob
8e2b3ac705 cmd/go: add release notes for go telemetry, and telemetry env values
This change fills in the release notes for the go telemetry command as
well as the unsettable GOTELEMETRY and GOTELEMETRYDIR go env values.

For #67111

Change-Id: Id6943f79f7ab2457787e1639d8d5fb1c1e2649dc
Reviewed-on: https://go-review.googlesource.com/c/go/+/587923
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
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2024-05-28 19:06:07 +00:00
Michael Anthony Knyszek
a2eae66c30 doc: add release notes for a couple minor tracing features
For #65614.

Change-Id: I759bf671b8f84c5224798b0dfaee6b158fdcc95a
Reviewed-on: https://go-review.googlesource.com/c/go/+/587927
Reviewed-by: Carlos Amedee <carlos@golang.org>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
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2024-05-24 21:37:09 +00:00
Dmitri Shuralyov
960cd14124 doc/README: suggest a way to preview next content, tweak release steps
Smaller edits are usually fine to do without previewing, since Markdown
can be intuitive. But for larger changes including re-ordering sections
and such, it can be helpful to quickly see the end result. Write down a
way to do that.

Update the release steps to capture that the doc/next content will move
to x/website before RC 1, when the complete release note draft is ready.

For #64169.

Change-Id: Ie554ed5294ce819fd0689e2249e6013826f0c71f
Reviewed-on: https://go-review.googlesource.com/c/go/+/587922
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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2024-05-24 16:43:34 +00:00
Dmitri Shuralyov
acc93dac83 doc/next: populate TODOs found with relnote todo
This is the first round of TODOs created based on relnote todo output.
There are many entries that need to be documented, expanded, reworded,
and this change makes progress on setting that up.

For this cycle, relnote todo implemented a simple heuristic of finding
CLs that mention accepted proposals (see issue 62376, or comment
https://go.dev/issue/62376#issuecomment-2101086794 specifically).
The "Items that don't need to be mentioned in Go 1.23 release notes but
are picked up by relnote todo." section in todo.md contains an attempt
at reviewing that list. The large number of items needed to be reviewed
made it impractical to spend much time on any individual one.

For #65614.

Change-Id: Id9d5f1795575a46df2ec4ed0088de07ee6075a90
Reviewed-on: https://go-review.googlesource.com/c/go/+/588015
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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2024-05-23 20:49:22 +00:00
Dmitri Shuralyov
a5339da341 doc/next: document go mod tidy -diff flag
Add a release note for the flag that CL 585401 added.

For #27005.
For #65614.

Change-Id: Ib26eb1b85c511d3cb41a29a8d9354577dd9a0e14
Reviewed-on: https://go-review.googlesource.com/c/go/+/587695
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2024-05-23 14:44:59 +00:00
Roland Shoemaker
9eeb627f60 crypto/tls: add ech client support
This CL adds a (very opinionated) client-side ECH implementation.

In particular, if a user configures a ECHConfigList, by setting the
Config.EncryptedClientHelloConfigList, but we determine that none of
the configs are appropriate, we will not fallback to plaintext SNI, and
will instead return an error. It is then up to the user to decide if
they wish to fallback to plaintext themselves (by removing the config
list).

Additionally if Config.EncryptedClientHelloConfigList is provided, we
will not offer TLS support lower than 1.3, since negotiating any other
version, while offering ECH, is a hard error anyway. Similarly, if a
user wishes to fallback to plaintext SNI by using 1.2, they may do so
by removing the config list.

With regard to PSK GREASE, we match the boringssl  behavior, which does
not include PSK identities/binders in the outer hello when doing ECH.

If the server rejects ECH, we will return a ECHRejectionError error,
which, if provided by the server, will contain a ECHConfigList in the
RetryConfigList field containing configs that should be used if the user
wishes to retry. It is up to the user to replace their existing
Config.EncryptedClientHelloConfigList with the retry config list.

Fixes #63369

Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest
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2024-05-23 03:10:12 +00:00
Mordy Ovits
fd1363240a doc: fix two instances of "the the" in godebug.md
Remove two instances of "the the" introduced recently
in CL 562343 and CL 562975.

Change-Id: Ib32ca80fcd6764343021c84135bd65853945c9ea
GitHub-Last-Rev: 0bd2c0b4bd
GitHub-Pull-Request: golang/go#67594
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2024-05-23 01:45:30 +00:00
Roland Shoemaker
56ec5d96bc crypto/tls: populate Leaf in X509KeyPair
Fixes #67065

Change-Id: I189e194de8aa94523eb64e1dd294a70cb81cbdf6
Reviewed-on: https://go-review.googlesource.com/c/go/+/585856
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2024-05-22 22:58:43 +00:00
Filippo Valsorda
587c3847da math/rand/v2: add ChaCha8.Read
Fixes #67059
Closes #67452
Closes #67498

Change-Id: I84eba2ed787a17e9d6aaad2a8a78596e3944909a
Reviewed-on: https://go-review.googlesource.com/c/go/+/587280
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2024-05-22 22:09:08 +00:00
Filippo Valsorda
032660573c crypto/tls: disable 3-DES by default
Fixes #66214

Change-Id: Iba8006a17fc7cd33c7485ab1a1ef8f56531c0ed1
Reviewed-on: https://go-review.googlesource.com/c/go/+/587295
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2024-05-22 21:30:50 +00:00
islishude
2bf686dfe9 net/http: add partitioned attribute to cookie type
Fixes #62490

Change-Id: Ibe7df96f50275c9321462e994a962031cb1f3018
GitHub-Last-Rev: 7df8738b80
GitHub-Pull-Request: golang/go#62499
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2024-05-22 18:33:05 +00:00
Dmitri Shuralyov
614f2284d9 doc/initial, doc/next: add draft notice to introduction
Go release notes always start out as a draft with a clear notice.
That notice is removed when the final release (go1.N.0) is made.
For example, the last time was in CL 562255.

Add this to the Go 1.23 draft and to the future fragment template.

Also switch to the main pkg.go.dev instance and use a relative issue
link in 3-tools.md while here.

For #64169.
For #65614.

Change-Id: I16bc0fa8a3a43ee7a9edd7fa253999041f1892e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/587415
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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2024-05-22 18:25:26 +00:00
Roland Shoemaker
0ec709f180 html: update jstmpllitinterp doc
We no longer do anything with this GODEBUG.

Fixes #66217

Change-Id: I998797b6a573013f5b9c8ded835acae572327d18
Reviewed-on: https://go-review.googlesource.com/c/go/+/584117
Reviewed-by: Cherry Mui <cherryyz@google.com>
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2024-05-22 18:04:29 +00:00
Damien Neil
cbd8f16adc crypto/tls: improved 0-RTT QUIC API
Add synchronous management of stored sessions to QUICConn.

This adds QUICStoreSession and QUICResumeSession events,
permitting a QUIC implementation to handle session resumption
as part of its regular event loop processing.

Fixes #63691

Change-Id: I9fe16207cc1986eac084869675bc36e227cbf3f0
Reviewed-on: https://go-review.googlesource.com/c/go/+/536935
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2024-05-22 17:23:54 +00:00
Roland Shoemaker
8524931a2c crypto/x509: reject serial numbers longer than 20 octets
Updates #65085

Change-Id: I8e5fb6c77c54f07247b30afea9fe8c548bf6d0be
Reviewed-on: https://go-review.googlesource.com/c/go/+/562975
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2024-05-22 17:23:31 +00:00
Roland Shoemaker
db13584bae crypto/x509: reject negative serial numbers
There is only one trusted certificate I could find in the web pki which
has a negative serial number. Removing this exception seems reasonable.

Updates #65085

Change-Id: I55435b3d75479dcb41d523383e4ff7894a1496ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/562343
Auto-Submit: Roland Shoemaker <roland@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
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Reviewed-by: Damien Neil <dneil@google.com>
2024-05-22 17:23:27 +00:00
Jes Cok
5f6a85637c doc: correct issue number for release note
Also simplify links.

Change-Id: I412d6c914d05bd093df46926a4f1742d664fefea
Reviewed-on: https://go-review.googlesource.com/c/go/+/587355
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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2024-05-22 16:06:02 +00:00
Filippo Valsorda
d0edd9acc8 crypto/tls: implement X25519Kyber768Draft00
Forced the testConfig CurvePreferences to exclude X25519Kyber768Draft00
to avoid bloating the transcripts, but I manually tested it and the
tests all update and pass successfully, causing 7436 insertions(+), 3251
deletions(-).

Fixes #67061

Change-Id: If6f13bca561835777ab0889a490487b7c2366c3c
Reviewed-on: https://go-review.googlesource.com/c/go/+/586656
Auto-Submit: Filippo Valsorda <filippo@golang.org>
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2024-05-22 14:56:25 +00:00
Filippo Valsorda
c96159c252 crypto/x509: cleanup signature generation
Centralizing some repetitive code, which would have prevented #45990.

This also fixes the deprecated Certificate.CreateCRL for RSA-PSS, not
that anyone cared, probably.

This has two other minor observable behavior changes: MD2 is now treated
as a completely unknown algorithm (why did we even have that!? removing
lets us treat hash == 0 as always meaning no prehash); and we now do the
signature verification self-check for all signing operations.

Change-Id: I3b34fe0c3b6eb6181d2145b0704834225cd45a27
Reviewed-on: https://go-review.googlesource.com/c/go/+/586015
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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2024-05-22 09:20:15 +00:00
Rhys Hiltner
87e930f728 runtime: remove GODEBUG=runtimecontentionstacks
Go 1.22 promised to remove the setting in a future release once the
semantics of runtime-internal lock contention matched that of
sync.Mutex. That work is done, remove the setting.

For #66999

Change-Id: I3c4894148385adf2756d8754e44d7317305ad758
Reviewed-on: https://go-review.googlesource.com/c/go/+/585639
Reviewed-by: Carlos Amedee <carlos@golang.org>
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2024-05-21 17:17:36 +00:00
Felix Geisendörfer
1b9dc3e178 runtime: increase profiling stack depth to 128
The current stack depth limit for alloc, mutex, block, threadcreate and
goroutine profiles of 32 frequently leads to truncated stack traces in
production applications. Increase the limit to 128 which is the same
size used by the execution tracer.

Create internal/profilerecord to define variants of the runtime's
StackRecord, MemProfileRecord and BlockProfileRecord types that can hold
arbitrarily big stack traces. Implement internal profiling APIs based on
these new types and use them for creating protobuf profiles and to act
as shims for the public profiling APIs using the old types.

This will lead to an increase in memory usage for applications that
use the impacted profile types and have stack traces exceeding the
current limit of 32. Those applications will also experience a slight
increase in CPU usage, but this will hopefully soon be mitigated via CL
540476 and 533258 which introduce frame pointer unwinding for the
relevant profile types.

For #43669.

Change-Id: Ie53762e65d0f6295f5d4c7d3c87172d5a052164e
Reviewed-on: https://go-review.googlesource.com/c/go/+/572396
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2024-05-21 14:38:45 +00:00
David Chase
22344e11f2 cmd/compile: add structs.HostLayout
This is for the proposal, plus a few bug fixes
that would/will be necessary when this is put into
actual use.

Fixes #66408.
Updates #63131.

Change-Id: I3a66e09d707dd579c59f155e7f53367f41214c30
Reviewed-on: https://go-review.googlesource.com/c/go/+/578355
Reviewed-by: Austin Clements <austin@google.com>
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2024-05-20 21:19:39 +00:00
David Chase
1028d973d2 doc: add release notes for hot block alignment
This is for the changes in CL 577935.

Change-Id: I8f70dd36c89aaede11a37744c0f279439e01eb13
Reviewed-on: https://go-review.googlesource.com/c/go/+/586895
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Keith Randall <khr@google.com>
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2024-05-20 20:23:04 +00:00
Lorenz Bauer
04bf36e973 encoding/binary: add Append, Encode and Decode
Add a function which appends the binary representation of a value to the end of a slice.
This allows users to encode values with zero allocations. Also add Encode and Decode
functions which mimic unicode/utf8.

goos: darwin
goarch: arm64
pkg: encoding/binary
cpu: Apple M1 Pro
                            │   base.txt    │             append.txt              │
                            │    sec/op     │    sec/op     vs base               │
ReadSlice1000Int32s-10         2.690µ ±  0%    2.532µ ± 3%   -5.86% (p=0.002 n=6)
ReadStruct-10                  205.8n ±  0%    201.4n ± 1%   -2.14% (p=0.002 n=6)
WriteStruct-10                 159.1n ±  0%    153.5n ± 0%   -3.55% (p=0.002 n=6)
WriteSlice1000Structs-10       129.8µ ±  0%    124.2µ ± 0%   -4.34% (p=0.002 n=6)
ReadSlice1000Structs-10        161.7µ ±  0%    160.3µ ± 0%   -0.89% (p=0.002 n=6)
ReadInts-10                    156.8n ±  0%    161.6n ± 0%   +3.09% (p=0.002 n=6)
WriteInts-10                   134.5n ±  0%    139.5n ± 2%   +3.72% (p=0.002 n=6)
WriteSlice1000Int32s-10        2.691µ ± 16%    2.551µ ± 4%   -5.20% (p=0.002 n=6)
PutUint16-10                  0.6448n ±  4%   0.6212n ± 1%        ~ (p=0.093 n=6)
AppendUint16-10                1.414n ±  0%    1.424n ± 1%        ~ (p=0.115 n=6)
PutUint32-10                  0.6210n ±  0%   0.6211n ± 0%        ~ (p=0.833 n=6)
AppendUint32-10                1.414n ±  0%    1.426n ± 1%   +0.85% (p=0.017 n=6)
PutUint64-10                  0.6210n ±  0%   0.6394n ± 1%   +2.95% (p=0.002 n=6)
AppendUint64-10                1.414n ±  0%    1.427n ± 2%        ~ (p=0.052 n=6)
LittleEndianPutUint16-10      0.6239n ±  0%   0.6271n ± 1%        ~ (p=0.063 n=6)
LittleEndianAppendUint16-10    1.421n ±  0%    1.432n ± 1%   +0.81% (p=0.002 n=6)
LittleEndianPutUint32-10      0.6240n ±  0%   0.6240n ± 0%        ~ (p=0.766 n=6)
LittleEndianAppendUint32-10    1.422n ±  1%    1.425n ± 0%        ~ (p=0.673 n=6)
LittleEndianPutUint64-10      0.6242n ±  0%   0.6238n ± 0%   -0.08% (p=0.030 n=6)
LittleEndianAppendUint64-10    1.420n ±  0%    1.449n ± 1%   +2.04% (p=0.002 n=6)
ReadFloats-10                  39.36n ±  0%    42.54n ± 1%   +8.08% (p=0.002 n=6)
WriteFloats-10                 33.65n ±  0%    35.27n ± 1%   +4.80% (p=0.002 n=6)
ReadSlice1000Float32s-10       2.656µ ±  0%    2.526µ ± 1%   -4.91% (p=0.002 n=6)
WriteSlice1000Float32s-10      2.765µ ±  0%    2.857µ ± 3%   +3.31% (p=0.002 n=6)
ReadSlice1000Uint8s-10         129.1n ±  1%    130.4n ± 1%        ~ (p=0.126 n=6)
WriteSlice1000Uint8s-10       144.90n ±  3%    18.67n ± 2%  -87.12% (p=0.002 n=6)
PutUvarint32-10                12.11n ±  0%    12.12n ± 0%        ~ (p=0.675 n=6)
PutUvarint64-10                30.82n ±  0%    30.79n ± 1%        ~ (p=0.658 n=6)
AppendStruct-10                                107.8n ± 0%
AppendSlice1000Structs-10                      119.0µ ± 0%
AppendInts-10                                  55.29n ± 0%
AppendSlice1000Int32s-10                       2.211µ ± 1%
geomean                        33.07n          48.18n        -7.03%

Fixes #60023

Change-Id: Ife3f217b11d5f3eaa5a53fe8a7e877552f751f94
Reviewed-on: https://go-review.googlesource.com/c/go/+/579157
Reviewed-by: Keith Randall <khr@google.com>
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2024-05-20 18:58:26 +00:00
Jes Cok
fd54936ea5 doc: simplify links for release notes
Change-Id: If9e3c5a58726ae3628d2e835d71f1a4708594c11
Reviewed-on: https://go-review.googlesource.com/c/go/+/586575
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Reviewed-by: Jonathan Amsterdam <jba@google.com>
2024-05-20 18:34:13 +00:00
aimuz
2b0f2f8169 maps: add All, Keys, Values, Insert, Collect
Fixed #61900.

Change-Id: Ic5962dc92b3102e7448635bef541414a2eaf415e
GitHub-Last-Rev: 3c6f74d617
GitHub-Pull-Request: golang/go#67521
Reviewed-on: https://go-review.googlesource.com/c/go/+/586716
Auto-Submit: Ian Lance Taylor <iant@google.com>
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2024-05-20 16:01:35 +00:00
Mauri de Souza Meneguzzo
192d65e46b sync/atomic: public And/Or ops and race instrumentation
This CL implements the new sync/atomic AND and OR apis as well as their race
counterparts.

Fixes #61395

Change-Id: I294eefe4b3ac27bc4ed237edcbfa88a8c646d86f
GitHub-Last-Rev: f174297007
GitHub-Pull-Request: golang/go#64331
Reviewed-on: https://go-review.googlesource.com/c/go/+/544455
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2024-05-17 18:37:29 +00:00
Chen.Zhidong
a523152ea1 net/http: add Pattern field in Request to return matched pattern info
Fixes #66405

Change-Id: Icd80944b6ca081aa7addd4fb85d2b3c29b6c9542
GitHub-Last-Rev: c6e32742c4
GitHub-Pull-Request: golang/go#66618
Reviewed-on: https://go-review.googlesource.com/c/go/+/574997
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Reviewed-by: Jonathan Amsterdam <jba@google.com>
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2024-05-16 18:42:34 +00:00
Jonathan Amsterdam
06b4578160 doc/README.md: give example of package-less symbol link
Change-Id: I84d7b6aae7319cc62628a2b5ee752a0680377a15
Reviewed-on: https://go-review.googlesource.com/c/go/+/586135
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2024-05-16 18:37:47 +00:00
Jonathan Amsterdam
4c1cc1c97f doc/next/64910.md: reword release note
Change-Id: I41a01dd2bcaf5716703946bad42830d4e8095c11
Reviewed-on: https://go-review.googlesource.com/c/go/+/586136
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2024-05-16 16:44:13 +00:00
Jes Cok
2b3d98f2ba doc: make symbol links simpler for relnotes
Change-Id: Ie8ff3d1d1398618b9a229aa3cb1ef2deaa58c3d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/586056
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2024-05-16 15:53:51 +00:00
qiulaidongfeng
6cd066f8b2 cmd/go: add -changed to query for non-defaults in the env
Fixes #34208

Change-Id: I8ec2d96262dcd7cbf870f6173690143c54190722
GitHub-Last-Rev: 6543df4784
GitHub-Pull-Request: golang/go#65655
Reviewed-on: https://go-review.googlesource.com/c/go/+/563137
Reviewed-by: Alan Donovan <adonovan@google.com>
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2024-05-16 14:34:32 +00:00
Jonathan Amsterdam
ee0bf1d1b6 doc/README.md: mention adding the proposal issue
Inform users that every accepted proposal should be mentioned
in the release notes to avoid generating a TODO.

Also, clarify instructions for the release team.

For #64169.

Change-Id: I03921739af31fc93f4b5808b2c7c98e28ad3da11
Reviewed-on: https://go-review.googlesource.com/c/go/+/584615
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2024-05-16 12:38:55 +00:00
Mateusz Poliwczak
722d59436b crypto/x509: add text and binary marshal methods to OID
Fixes #66249

Change-Id: I5973a19a087a35ad951e8a220d3e6e4456c7577f
GitHub-Last-Rev: 921ca8bd0c
GitHub-Pull-Request: golang/go#66599
Reviewed-on: https://go-review.googlesource.com/c/go/+/575295
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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2024-05-16 02:00:26 +00:00
Alan Donovan
7730e5b783 go/ast: add Preorder go1.23 iterator
This CL adds a new function Preorder that makes it
easier to iterate over the nodes of a syntax tree.
In particular, break, continue, and return retain
their usual continuations.

Fixes #66339

Change-Id: I438b3c23780c91ed589871ad3b8822d54e8fabc7
Reviewed-on: https://go-review.googlesource.com/c/go/+/570680
Reviewed-by: Robert Findley <rfindley@google.com>
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2024-05-15 21:44:50 +00:00
Robert Griesemer
bf279b71e2 go/types, types2: add Alias.{TypeParams, SetTypeParams, TypeArgs, Origin}
Fixes #67143.

Change-Id: I8bf9c2559f95d3d6a40874454208ae074b68875c
Reviewed-on: https://go-review.googlesource.com/c/go/+/583757
Reviewed-by: Alan Donovan <adonovan@google.com>
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2024-05-15 21:32:30 +00:00
Alan Donovan
3f7a030e02 runtime/debug: add SetCrashOutput(...CrashOptions) parameter
This is a placeholder for future options (e.g. JSON).

The parameter is temporarily variadic to avoid breaking
x/telemetry (see CL 585378), but I plan to remove
the "..." later this week.

Updates #67182

Change-Id: I3f6f39455d852f92902f8e3f007d3093cbe555db
Reviewed-on: https://go-review.googlesource.com/c/go/+/585557
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2024-05-15 21:04:14 +00:00
Russ Cox
6ccd8e4cf6 cmd/go: add support for godebug lines in go.mod and go.work
The fact that the go line sets both the language version and the
GODEBUG compatibility version can be a problem, especially since
the go line is also required to be ≥ the go lines of any required
dependency modules.

This change adds a new 'godebug' line to go.mod and go.work
to allow setting the GODEBUG values for the entire module.

It also adds a new meta-value default=go1.21 that means
take the defaults from Go 1.21 no matter what the go line says.

These were discussed in proposal #65573.

Fixes #65573.

Change-Id: I91746322a10178370ed1015ce5278372a024c824
Reviewed-on: https://go-review.googlesource.com/c/go/+/584476
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2024-05-15 13:52:10 +00:00
Russ Cox
bbdad50c09 doc/godebug: correct gotypealias=1 deprecation
Per the note earlier in the page, GODEBUGs are maintained for a
minimum of two years (four Go releases). Not said but certainly
implied is that they are maintained for four Go releases from the
point where people started needing to use them.

Since people would start needing gotypesalias=0 in Go 1.23,
it can be removed in Go 1.27.

Change-Id: Ifad63a1fff63c3f96f2ee192ca74bd1ce8bdb61f
Reviewed-on: https://go-review.googlesource.com/c/go/+/585457
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2024-05-15 12:20:56 +00:00
Than McIntosh
0767ffdf27 doc: add relnote fragment on stack slot merging
Add a blurb to the toolchain section talking about stack slot merging.

Updates #62737.

Change-Id: I26193a6a381c95ff5d79ce80b77c10c7561d00cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/581439
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2024-05-14 17:18:10 +00:00
Matt Layher
f6c3a3e3c8 slices: add Chunk
Chunk returns an iterator over consecutive sub-slices of up to n elements of s.

Fixes #53987.

Change-Id: I508274eca388db39550eb9e4d8abd5ce68d29d8d
Reviewed-on: https://go-review.googlesource.com/c/go/+/562935
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2024-05-10 17:28:50 +00:00
Ian Lance Taylor
0b5f72251b slices: add iterator-related functions
Fixes #61899

Change-Id: Icbde1ac8293723eefc3251008ae9711e756ed1b3
Reviewed-on: https://go-review.googlesource.com/c/go/+/568477
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2024-05-09 19:20:55 +00:00
qiulaidongfeng
524a774634 reflect: add iterative related methods
Fixes #66056

Change-Id: I1e24636e43e68cd57576c39b014e0826fb6c322c
GitHub-Last-Rev: 319ad8ea7c
GitHub-Pull-Request: golang/go#66824
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2024-05-09 11:54:18 +00:00
Alan Donovan
69e75c8581 runtime: properly frame panic values in tracebacks
This CL causes the printing of panic values to ensure that all
newlines in the output are immediately followed by a tab, so
that there is no way for a maliciously crafted panic value to
fool a program attempting to parse the traceback into thinking
that the panic value is in fact a goroutine stack.

See https://github.com/golang/go/issues/64590#issuecomment-1932675696

+ release note

Updates #64590
Updates #63455

Change-Id: I5142acb777383c0c122779d984e73879567dc627
Reviewed-on: https://go-review.googlesource.com/c/go/+/581215
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2024-05-08 19:10:41 +00:00
Russ Cox
9c4849bf20 math/rand/v2: add Uint
Uint was part of the approved proposal but was inadvertently left
out of Go 1.22. Add for Go 1.23.

Change-Id: Ifaf24447bd70c8524c2fd299eefdf4aa29e49e66
Reviewed-on: https://go-review.googlesource.com/c/go/+/583455
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2024-05-07 18:03:11 +00:00
Russ Cox
5a181c5042 iter: expose fundamental types to Go 1.23
These were previously only available with GOEXPERIMENT=rangefunc.

For #61897.

Change-Id: I86aea5ae8be1f7a2975b623325811221ed40d384
Reviewed-on: https://go-review.googlesource.com/c/go/+/557836
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2024-05-06 20:33:25 +00:00
Alan Donovan
6defff5005 cmd/vet: add stdversion analyzer
+ release note, test

Fixes #46136

Change-Id: Ib157c5343dde379f8d6f67bdfa64b3f6a6432bab
Reviewed-on: https://go-review.googlesource.com/c/go/+/582556
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2024-05-03 01:02:40 +00:00
Olivier Mengué
344075d936 spec: clarify when range expression is evaluated
Clarify that the range expression of a "for" loop is called *just* once to
rule out that it might be re-evaluated after each iteration.

Change-Id: Iedb61cd29e5238ac0168b8ac01c34d6208cc4312
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2024-05-02 22:43:51 +00:00
Jonathan Amsterdam
0e7f5cf30b doc/README.md: discourage RELNOTE in CLs
Release notes should always be files under doc/next. Make it clear that
this is the only way to add them: RELNOTE markers in CLs are no longer
supported.

Change-Id: I34d77eb876f57b84ecdc7e5ecbf3eb5c91e6fed8
Reviewed-on: https://go-review.googlesource.com/c/go/+/582075
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2024-04-26 21:24:36 +00:00
Robert Griesemer
5419f652b6 spec: clarify prose for range over numeric range expressions
Fixes #66967.

Change-Id: I7b9d62dcb83bad60b2ce74e2e2bf1a36c6a8ae38
Reviewed-on: https://go-review.googlesource.com/c/go/+/581256
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2024-04-26 00:39:16 +00:00
Robert Griesemer
db5f2b4153 spec: clarify when a range expression is evaluated
If the range expression is a numeric constant, the
range expression is also not evaluated.

Change-Id: I97201e5c136d3d1a87ed1500b19b7199b30bc9ff
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2024-04-25 01:05:15 +00:00
Alan Donovan
9b9de261bd go/types: add Alias.Rhs
This method returns the type on the right-hand side of an
alias declaration such as type L = R.

Fixes #66559

Change-Id: I396f2d999680ad251f47cdde20856ae20fc1c40a
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2024-04-24 21:50:16 +00:00
guoguangwu
4792ca7b93 doc: fix typos in docs
Change-Id: Ib51283b35d6d35acd7a90cd531ff6897a23d9894
GitHub-Last-Rev: dd485f332e
GitHub-Pull-Request: golang/go#66985
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2024-04-24 13:37:36 +00:00
Michael Anthony Knyszek
a088e230d4 unique: add unique package and implement Make/Handle
This change adds the unique package for canonicalizing values, as
described by the proposal in #62483.

Fixes #62483.

Change-Id: I1dc3d34ec12351cb4dc3838a8ea29a5368d59e99
Reviewed-on: https://go-review.googlesource.com/c/go/+/574355
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2024-04-22 18:14:07 +00:00
Jes Cok
f31fcc7538 doc: make symbol links simpler for relnotes
This is a follow-up to CL 578195.

Change-Id: I6466ff8753f05a9424a8098cd88490aab6b236c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/580277
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2024-04-19 14:33:17 +00:00
Nuno Gonçalves
a63907808d net/http: add field Cookie.Quoted bool
The current implementation of the http package strips double quotes
from the cookie-value during parsing, resulting in the serialized
cookie not including them. This patch addresses this limitation by
introducing a new field to track whether the original value was
enclosed in quotes.

Additionally, the internal representation of a cookie in the cookiejar
package has been adjusted to align with the new representation.

The syntax of cookies is outlined in RFC 6265 Section 4.1.1:
https://datatracker.ietf.org/doc/html/rfc6265\#section-4.1.1

Fixes #46443

Change-Id: Iac12a56397d77a6060a75757ab0daeacc60457f3
GitHub-Last-Rev: a76440e741
GitHub-Pull-Request: golang/go#66752
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2024-04-19 00:32:19 +00:00
Alan Donovan
01064622a2 go/types: add Func.Signature method
Unfortunately we can't enforce the repr invariant
that Func.typ != nil without thinking about the
object color invariants. For now, return a trivial
Signature if typ == nil, which should never happen
in bug-free client code.

Fixes golang/go#65772

Change-Id: I7f89c6d8fdc8dcd4b8880572e54bb0ed9b6136eb
Reviewed-on: https://go-review.googlesource.com/c/go/+/565375
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2024-04-18 22:17:27 +00:00
Jes Cok
a0205e650a doc: simplify symbol links for relnotes
This is a follow-up to CL 578195.

Change-Id: Iab38ee008df8b06c300b0027019cc0464bdadca1
Reviewed-on: https://go-review.googlesource.com/c/go/+/579796
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2024-04-18 16:00:16 +00:00
Michael Pratt
84fbdf01ff cmd/go: use cache for PGO preprocessing
This is the final CL in the series adding PGO preprocessing support to
cmd/go. Now that the tool is hooked up, we integrate with the build
cache to cache the result.

This is fairly straightforward. One difference is that the compile and
link do caching through updateBuildID. However, preprocessed PGO files
don't have a build ID, so it doesn't make much sense to hack our way
through that function when it is simple to just add to the cache
ourselves.

As as aside, we could add a build ID to the preproccessed file format,
though it is not clear if it is worthwhile. The one place a build ID
could be used is in buildActionID, which currently compute the file hash
of the preprocessed profile. With a build ID it could simply read the
build ID. This would save one complete read of the file per build
(cmd/go caches the hash), but each compile process also reads the entire
file, so this is a small change overall.

Fixes #58102.

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2024-04-18 15:39:17 +00:00
Jes Cok
076166ab4e net/http: add ParseCookie, ParseSetCookie
Fixes #66008

Change-Id: I64acb7da47a03bdef955f394682004906245a18b
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2024-04-17 17:43:50 +00:00
Ian Lance Taylor
b1ae67501a doc: fix tense in godebug (s/revert/reverted)
Change-Id: Ida6ed22102a6da36739c7581aeab297fdd7bc9f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/561715
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2024-04-16 17:29:58 +00:00
Ian Lance Taylor
315b6ae682 debug/elf: define non-standard but well-known symbol types
Fixes #66836

Change-Id: I603faca2acd2bcffabbcaca8b8670d46387d2a5b
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2024-04-16 00:01:16 +00:00
Mateusz Poliwczak
71d84ee7b4 net: add Unwrap to *DNSError
Fixes #63116

Change-Id: Iab8c415555ab85097be6d2d133b3349c5219a23b
GitHub-Last-Rev: 8a8177b9af
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2024-04-14 18:23:45 +00:00
Jes Cok
1962672620 doc: make use of simpler symbol links for relnotes
This is a practical use of CL 577915, follow-up to CL 577835.

Change-Id: Ibe7e2fa11b444afa1898dc6f6aba1512fe98f1fe
Reviewed-on: https://go-review.googlesource.com/c/go/+/578195
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2024-04-12 20:57:18 +00:00
Joe Tsai
1843464f01 all: consistently use "IEEE 754" over "IEEE-754"
There is no hyphen between the organization and the number.

For example, https://standards.ieee.org/ieee/754/6210/
shows the string "IEEE 754-2019" and not "IEEE-754-2019".

This assists in searching for "IEEE 754" in documentation
and not missing those using "IEEE-754".

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2024-04-11 20:22:45 +00:00
Johan Brandhorst-Satzkorn
890179d949 misc/wasm: drop wasmtime < 14 support
For Go 1.23, we decided to no longer support the old CLI interface
exposed by wasmtime. This removes the extra logic included to support
both the new and the old CLI interface. Now only versions of wasmtime
14 and newer are supported.

Fixes #63718

Change-Id: Iea31388dc41bc8d73caa923c7e4acae2228bf515
Reviewed-on: https://go-review.googlesource.com/c/go/+/577135
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2024-04-11 17:09:10 +00:00
Jonathan Amsterdam
5b5d6f87a8 doc/README.md: note simpler symbol links
Document that links to symbols in the standard library can be
written as "[foo]", without the actual link.

For #64169.

Change-Id: I9d8a33e85df70037320a169d55a2bb4a8a981ebf
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2024-04-10 19:41:39 +00:00
Jes Cok
236fe24ed5 doc: update relnote for sync.Map.Clear
Change-Id: I28baf375502ccf3b0dfcc8250650e914ac7bae78
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2024-04-10 17:07:25 +00:00
Olivier Mengué
74cce866f8 testing/fstest: return structured errors in TestFS
TestFS now returns a structured error built with errors.Join to allow to
inspect errors using errors.Is and errors.As.

All errors are now wrapped using fmt.Errorf and %w.

Fixes #63675.

Change-Id: I8fc3363f8ae70085af4afdb84c16be9ca70d7731
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2024-04-05 17:45:39 +00:00
Cuong Manh Le
d08a957298 all: add reflect.SliceAt function
Fixes #61308

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2024-04-02 21:51:18 +00:00
Ian Lance Taylor
27f41bb153 Revert "testing: add TB.SetGOMAXPROCS function"
This reverts CL 519235.

Reason for revert: Proposal is still in incoming.

For #62020

Change-Id: Icccb930209f36097f5d930c01eda6b5042bdddc1
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2024-03-22 13:07:36 +00:00
sivchari
5d29578fd5 testing: add TB.SetGOMAXPROCS function
Add a new method TB.SetGOMAXPROCS which sets variable of GOMAXPROCS.
This method aims to set a variable for the isolated lifetime of the test and cleans up.
And unset this when the test ends.
This method disables the test or benchmark from running in
parallel.

Fixes: #62020

Change-Id: Iae44109d0def35cc47049c3ca4cd5306173d52ee
Signed-off-by: sivchari <shibuuuu5@gmail.com>
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2024-03-21 20:26:36 +00:00
Dmitri Shuralyov
364687bda9 doc/go1.23: document "net/http".Request.CookiesNamed method
CL 511516 added the method but didn't include a release note for it
because it was authored and tested before the new release note flow.

For #61472.

Change-Id: I38f73e97093a2badaea658ed430e174b73e35b3a
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2024-03-20 18:08:20 +00:00
Jes Cok
f94d82b2c0 slices: add func Repeat
Fixes #65238

Change-Id: I32ae4d922788cc6fbbe80f5b558a075951e3c892
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2024-03-19 21:38:37 +00:00
qiulaidongfeng
d838e4dcdf archive/tar: add FileInfoNames interface
An optional interface FileInfoNames has been added.

If the parameter fi of FileInfoHeader implements the interface
the Gname/Uname of the return value Header
are provided by the method of the interface.

Also added testing.

Fixes #50102

Change-Id: I47976e238eb20ed43113b060e4f83a14ae49493e
GitHub-Last-Rev: a213613c79
GitHub-Pull-Request: golang/go#65273
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2024-03-15 16:01:50 +00:00
Russ Cox
453cbb8f67 doc: document new timer behavior
Change-Id: Ifa5894c67a36eb2c101b23b85775a3702512ca79
Reviewed-on: https://go-review.googlesource.com/c/go/+/571796
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Russ Cox <rsc@golang.org>
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2024-03-15 03:39:19 +00:00
Russ Cox
9a9b110f58 doc: fix various release notes mistakes
Change-Id: Ib7666b3df1d7190772748129c349d4dc7046ca5b
Reviewed-on: https://go-review.googlesource.com/c/go/+/571795
TryBot-Bypass: Russ Cox <rsc@golang.org>
Auto-Submit: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
2024-03-15 03:39:16 +00:00
Russ Cox
966609ad9e time: avoid stale receives after Timer/Ticker Stop/Reset return
A proposal discussion in mid-2020 on #37196 decided to change
time.Timer and time.Ticker so that their Stop and Reset methods
guarantee that no old value (corresponding to the previous configuration
of the Timer or Ticker) will be received after the method returns.

The trivial way to do this is to make the Timer/Ticker channels
unbuffered, create a goroutine per Timer/Ticker feeding the channel,
and then coordinate with that goroutine during Stop/Reset.
Since Stop/Reset coordinate with the goroutine and the channel
is unbuffered, there is no possibility of a stale value being sent
after Stop/Reset returns.

Of course, we do not want an extra goroutine per Timer/Ticker,
but that's still a good semantic model: behave like the channels
are unbuffered and fed by a coordinating goroutine.

The actual implementation is more effort but behaves like the model.
Specifically, the timer channel has a 1-element buffer like it always has,
but len(t.C) and cap(t.C) are special-cased to return 0 anyway, so user
code cannot see what's in the buffer except with a receive.
Stop/Reset lock out any stale sends and then clear any pending send
from the buffer.

Some programs will change behavior. For example:

	package main

	import "time"

	func main() {
		t := time.NewTimer(2 * time.Second)
		time.Sleep(3 * time.Second)
		if t.Reset(2*time.Second) != false {
			panic("expected timer to have fired")
		}
		<-t.C
		<-t.C
	}

This program (from #11513) sleeps 3s after setting a 2s timer,
resets the timer, and expects Reset to return false: the Reset is too
late and the send has already occurred. It then expects to receive
two values: the one from before the Reset, and the one from after
the Reset.

With an unbuffered timer channel, it should be clear that no value
can be sent during the time.Sleep, so the time.Reset returns true,
indicating that the Reset stopped the timer from going off.
Then there is only one value to receive from t.C: the one from after the Reset.

In 2015, I used the above example as an argument against this change.

Note that a correct version of the program would be:

	func main() {
		t := time.NewTimer(2 * time.Second)
		time.Sleep(3 * time.Second)
		if !t.Reset(2*time.Second) {
			<-t.C
		}
		<-t.C
	}

This works with either semantics, by heeding t.Reset's result.
The change should not affect correct programs.

However, one way that the change would be visible is when programs
use len(t.C) (instead of a non-blocking receive) to poll whether the timer
has triggered already. We might legitimately worry about breaking such
programs.

In 2020, discussing #37196, Bryan Mills and I surveyed programs using
len on timer channels. These are exceedingly rare to start with; nearly all
the uses are buggy; and all the buggy programs would be fixed by the new
semantics. The details are at [1].

To further reduce the impact of this change, this CL adds a temporary
GODEBUG setting, which we didn't know about yet in 2015 and 2020.
Specifically, asynctimerchan=1 disables the change and is the default
for main programs in modules that use a Go version before 1.23.
We hope to be able to retire this setting after the minimum 2-year window.
Setting asynctimerchan=1 also disables the garbage collection change
from CL 568341, although users shouldn't need to know that since
it is not a semantically visible change (unless we have bugs!).

As an undocumented bonus that we do not officially support,
asynctimerchan=2 disables the channel buffer change but keeps
the garbage collection change. This may help while we are
shaking out bugs in either of them.

Fixes #37196.

[1] https://github.com/golang/go/issues/37196#issuecomment-641698749

Change-Id: I8925d3fb2b86b2ae87fd2acd055011cbf7bd5916
Reviewed-on: https://go-review.googlesource.com/c/go/+/568341
Reviewed-by: Austin Clements <austin@google.com>
Auto-Submit: Russ Cox <rsc@golang.org>
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2024-03-14 18:25:25 +00:00