net: consolidate the existing Windows version checks

Change-Id: I9c0ad69bd61923e9e272f157dc380a9120f08423
Reviewed-on: https://go-review.googlesource.com/c/go/+/565595
Reviewed-by: Bryan Mills <bcmills@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Damien Neil <dneil@google.com>

net: support TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT on newer Windows

Follows up CL 542275

Fixes #65817

Change-Id: I0b77c23f15d595d58492dfa20839a08e8670448b
Reviewed-on: https://go-review.googlesource.com/c/go/+/565495
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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cmd/compile,cmd/internal/obj: provide rotation pseudo-instructions for riscv64

Provide and use rotation pseudo-instructions for riscv64. The RISC-V bitmanip
extension adds support for hardware rotation instructions in the form of ROL,
ROLW, ROR, RORI, RORIW and RORW. These are easily implemented in the assembler
as pseudo-instructions for CPUs that do not support the bitmanip extension.

This approach provides a number of advantages, including reducing the rewrite
rules needed in the compiler, simplifying codegen tests and most importantly,
allowing these instructions to be used in assembly (for example, riscv64
optimised versions of SHA-256 and SHA-512). When bitmanip support is added,
these instruction sequences can simply be replaced with a single instruction
if permitted by the GORISCV64 profile.

Change-Id: Ia23402e1a82f211ac760690deb063386056ae1fa
Reviewed-on: https://go-review.googlesource.com/c/go/+/565015
TryBot-Result: Gopher Robot <gobot@golang.org>
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Reviewed-by: M Zhuo <mengzhuo1203@gmail.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
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cmd: update telemetry to d5a85b2

commands run:
go get golang.org/x/telemetry@d5a85b2
go mod tidy
go mod vendor

Fixes #66099

Change-Id: Ia9215855f1472fa885792d5b23a986f29759af18
Reviewed-on: https://go-review.googlesource.com/c/go/+/569421
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cmd: update to golang.org/x/sys@v0.18.0

This is a requirement of x/telemetry so update it before updating
telemetry.

Commands run (in both std and cmd):
go get golang.org/x/sys@v0.18.0
go mod tidy
go mod vendor

For #66099

Change-Id: I636f0c0be89c05b9213c461b1a2eb2a4afb8a84b
Reviewed-on: https://go-review.googlesource.com/c/go/+/569420
Reviewed-by: Bryan Mills <bcmills@google.com>
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net/ip: proper ipv6 address parsing

Fixes #57760

Change-Id: Ic3698a18e1c80833b07e0e06bc7328d9714794c6
GitHub-Last-Rev: d185467491e2bfc9fb68e48b1193581bebd7d77f
GitHub-Pull-Request: golang/go#57761
Reviewed-on: https://go-review.googlesource.com/c/go/+/461605
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
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internal/fuzz: remove useless code

Change-Id: I4534a116ef421379b2356bbe80760adae8cdd95f
GitHub-Last-Rev: a3fab3f1fa84111f3f3af7cf9f98e964f2423c73
GitHub-Pull-Request: golang/go#65892
Reviewed-on: https://go-review.googlesource.com/c/go/+/566315
Run-TryBot: Tim King <taking@google.com>
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net/http: add ResponseController http2 request without body read deadline test

Requires CL 464936

For #58237

Change-Id: I007b61f0f216d759f8e5327d77affbd9e8f8ff23
GitHub-Last-Rev: 30a10909b03bb0e8e4cd370a6f5ca386cd4ebc39
GitHub-Pull-Request: golang/go#58282
Reviewed-on: https://go-review.googlesource.com/c/go/+/465035
Reviewed-by: Damien Neil <dneil@google.com>
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internal/syscall/windows/registry: append .dll when loading kernel32

Win32 LoadLibrary supports loading a DLL omitting the .dll extension,
but it is better to be explicit and include the extension. This is
consistent with all other uses of LoadLibrary in the Go standard
library.

Change-Id: I7349d0a27db5f8ab59061434f37d10918e43b869
Reviewed-on: https://go-review.googlesource.com/c/go/+/569535
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encoding/binary: use built-in clear to simplify code

Change-Id: I2f3c7f4a4848ad0fbbf79bd8919b1e2abee72f3f
GitHub-Last-Rev: 06d0047b28fe1c8c87f84aca049b8c76778732b9
GitHub-Pull-Request: golang/go#66136
Reviewed-on: https://go-review.googlesource.com/c/go/+/569280
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
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net/http: remove misleading response headers on error

ServeContent API is to set some headers you want to see in the response
before calling ServeContent. But if there is an error, those headers
should be removed otherwise they might confused the client.

Removing those headers is useful in general in the case of an error,
so we remove them in http.Error.

Fixes #50905.

Change-Id: If8d2786c1512906ac93e6b388df6ab1c5ecd1ea9
GitHub-Last-Rev: 32b6f045a791cf7bc391f018452a05cc872041ba
GitHub-Pull-Request: golang/go#64312
Reviewed-on: https://go-review.googlesource.com/c/go/+/544019
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Reviewed-by: Damien Neil <dneil@google.com>

cmd/dist: fix typo in comment

Change-Id: If8bcde960348ebafec2ced0e22f315685de0bb82
GitHub-Last-Rev: 4477ade97fe831284f78183905ee5222b0d1a7cd
GitHub-Pull-Request: golang/go#66124
Reviewed-on: https://go-review.googlesource.com/c/go/+/569278
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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database/sql: remove useless error check

Change-Id: Id2d45a4b43b05deba4e2c31f7c03008c2f2c18a2
GitHub-Last-Rev: 587bed9a64da08d5b476d87333aed72649dad470
GitHub-Pull-Request: golang/go#66110
Reviewed-on: https://go-review.googlesource.com/c/go/+/569075
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Jorropo <jorropo.pgm@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

internal/trace: remove unreachable code

Change-Id: If5c9801e8954ce7f517b90ea6c30ea3e9eec09ee
GitHub-Last-Rev: 135c8473ae9bc4126f3acdf72b1aeb90b0022297
GitHub-Pull-Request: golang/go#66051
Reviewed-on: https://go-review.googlesource.com/c/go/+/568395
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cmd/compile: mark DIEs of captured variables

Adds a new custom attribute to the DIE of captured variables,
containing the offset for the variable inside the closure struct. This
can be used by debuggers to display the contents of a closure variable.

Based on a sample program (delve) this increases the executable size by 0.06%.

benchstat output:

                         │   old.txt    │                new.txt                │
                         │    sec/op    │     sec/op      vs base               │
Template                   153.0m ±  6%    152.5m ±  14%       ~ (p=0.684 n=10)
Unicode                    100.2m ± 15%    104.9m ±   7%       ~ (p=0.247 n=10)
GoTypes                    943.6m ±  8%    986.2m ±  10%       ~ (p=0.280 n=10)
Compiler                   97.79m ±  6%   101.63m ±  12%       ~ (p=0.393 n=10)
SSA                         6.872 ± 37%     9.413 ± 106%       ~ (p=0.190 n=10)
Flate                      128.0m ± 36%    125.0m ±  56%       ~ (p=0.481 n=10)
GoParser                   214.9m ± 26%    201.4m ±  68%       ~ (p=0.579 n=10)
Reflect                    452.6m ± 22%    412.2m ±  74%       ~ (p=0.739 n=10)
Tar                        166.2m ± 27%    155.9m ±  73%       ~ (p=0.393 n=10)
XML                        219.3m ± 24%    211.3m ±  76%       ~ (p=0.739 n=10)
LinkCompiler               523.2m ± 13%    513.5m ±  47%       ~ (p=0.631 n=10)
ExternalLinkCompiler        1.684 ±  2%     1.659 ±  25%       ~ (p=0.218 n=10)
LinkWithoutDebugCompiler   304.9m ± 12%    309.1m ±   7%       ~ (p=0.631 n=10)
StdCmd                      70.76 ± 14%     68.66 ±  53%       ~ (p=1.000 n=10)
geomean                    511.5m          515.4m         +0.77%

                         │   old.txt    │               new.txt                │
                         │ user-sec/op  │  user-sec/op   vs base               │
Template                   269.6m ± 13%   292.3m ±  17%       ~ (p=0.393 n=10)
Unicode                    110.2m ±  8%   101.7m ±  18%       ~ (p=0.247 n=10)
GoTypes                     2.181 ±  9%    2.356 ±  12%       ~ (p=0.280 n=10)
Compiler                   119.1m ± 11%   121.9m ±  15%       ~ (p=0.481 n=10)
SSA                         17.75 ± 52%    26.94 ± 123%       ~ (p=0.190 n=10)
Flate                      256.2m ± 43%   226.8m ±  73%       ~ (p=0.739 n=10)
GoParser                   427.0m ± 24%   422.3m ±  72%       ~ (p=0.529 n=10)
Reflect                    990.5m ± 23%   905.5m ±  75%       ~ (p=0.912 n=10)
Tar                        307.9m ± 27%   308.9m ±  64%       ~ (p=0.393 n=10)
XML                        432.8m ± 24%   427.6m ±  89%       ~ (p=0.796 n=10)
LinkCompiler               796.9m ± 14%   800.4m ±  56%       ~ (p=0.481 n=10)
ExternalLinkCompiler        1.666 ±  4%    1.671 ±  28%       ~ (p=0.971 n=10)
LinkWithoutDebugCompiler   316.7m ± 12%   325.6m ±   8%       ~ (p=0.579 n=10)
geomean                    579.5m         594.0m         +2.51%

          │   old.txt    │                new.txt                │
          │  text-bytes  │  text-bytes   vs base                 │
HelloSize   842.9Ki ± 0%   842.9Ki ± 0%       ~ (p=1.000 n=10) ¹
CmdGoSize   10.95Mi ± 0%   10.95Mi ± 0%       ~ (p=1.000 n=10) ¹
geomean     3.003Mi        3.003Mi       +0.00%
¹ all samples are equal

          │   old.txt    │                new.txt                │
          │  data-bytes  │  data-bytes   vs base                 │
HelloSize   15.08Ki ± 0%   15.08Ki ± 0%       ~ (p=1.000 n=10) ¹
CmdGoSize   314.7Ki ± 0%   314.7Ki ± 0%       ~ (p=1.000 n=10) ¹
geomean     68.88Ki        68.88Ki       +0.00%
¹ all samples are equal

          │   old.txt    │                new.txt                │
          │  bss-bytes   │  bss-bytes    vs base                 │
HelloSize   396.8Ki ± 0%   396.8Ki ± 0%       ~ (p=1.000 n=10) ¹
CmdGoSize   428.8Ki ± 0%   428.8Ki ± 0%       ~ (p=1.000 n=10) ¹
geomean     412.5Ki        412.5Ki       +0.00%
¹ all samples are equal

          │   old.txt    │               new.txt               │
          │  exe-bytes   │  exe-bytes    vs base               │
HelloSize   1.310Mi ± 0%   1.310Mi ± 0%  +0.02% (p=0.000 n=10)
CmdGoSize   16.37Mi ± 0%   16.38Mi ± 0%  +0.01% (p=0.000 n=10)
geomean     4.631Mi        4.632Mi       +0.02%

Change-Id: Ib416ee2d916ec61ad4a5c26bab09597595f57e04
Reviewed-on: https://go-review.googlesource.com/c/go/+/563816
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cmd/dist,internal: add GOARM64 environment variable

Adds GOARM64 environment variable with accepted range of values "v8.{0-9}",
"v9.{0-5}" and optional ",lse" and ",crypto" suffixes.

Right now it doesn't affect anything, but can be used in the future to
selectively target specific versions of different ARM64 hardware.

For #60905

Change-Id: I6d530041b6931aa884e34f719f8ec41b1cb03ece
Reviewed-on: https://go-review.googlesource.com/c/go/+/559555
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Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Shu-Chun Weng <scw@google.com>
Reviewed-by: Fannie Zhang <Fannie.Zhang@arm.com>

slices: document that Clone can return extra capacity

Change-Id: I8b9aa1f36ce554d8855ee70e15f0dd0a8cf1097a
Reviewed-on: https://go-review.googlesource.com/c/go/+/568342
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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net/textproto, mime/multipart: avoid unbounded read in MIME header

mime/multipart.Reader.ReadForm allows specifying the maximum amount
of memory that will be consumed by the form. While this limit is
correctly applied to the parsed form data structure, it was not
being applied to individual header lines in a form.

For example, when presented with a form containing a header line
that never ends, ReadForm will continue to read the line until it
runs out of memory.

Limit the amount of data consumed when reading a header.

Fixes CVE-2023-45290
Fixes #65383

Change-Id: I7f9264d25752009e95f6b2c80e3d76aaf321d658
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/2134435
Reviewed-by: Roland Shoemaker <bracewell@google.com>
Reviewed-by: Tatiana Bradley <tatianabradley@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/569341
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
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net/http, net/http/cookiejar: avoid subdomain matches on IPv6 zones

When deciding whether to forward cookies or sensitive headers
across a redirect, do not attempt to interpret an IPv6 address
as a domain name.

Avoids a case where a maliciously-crafted redirect to an
IPv6 address with a scoped addressing zone could be
misinterpreted as a within-domain redirect. For example,
we could interpret "::1%.www.example.com" as a subdomain
of "www.example.com".

Thanks to Juho Nurminen of Mattermost for reporting this issue.

Fixes CVE-2023-45289
Fixes #65065

Change-Id: I8f463f59f0e700c8a18733d2b264a8bcb3a19599
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/2131938
Reviewed-by: Tatiana Bradley <tatianabradley@google.com>
Reviewed-by: Roland Shoemaker <bracewell@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/569340
Reviewed-by: Damien Neil <dneil@google.com>
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crypto/x509: make sure pub key is non-nil before interface conversion

alreadyInChain assumes all keys fit a interface which contains the
Equal method (which they do), but this ignores that certificates may
have a nil key when PublicKeyAlgorithm is UnknownPublicKeyAlgorithm. In
this case alreadyInChain panics.

Check that the key is non-nil as part of considerCandidate (we are never
going to build a chain containing UnknownPublicKeyAlgorithm anyway).

Fixes #65390
Fixes CVE-2024-24783

Change-Id: Ibdccc0a487e3368b6812be35daad2512220243f3
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/2137282
Reviewed-by: Damien Neil <dneil@google.com>
Run-TryBot: Roland Shoemaker <bracewell@google.com>
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Reviewed-on: https://go-review.googlesource.com/c/go/+/569339
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os: fix 63703.md release notes

63703.md contains a paragraph that shouldn't be there,
remove it.

While here, fix a test error message related to the #63703
implementation.

Updates #63703.

Change-Id: I82a8b0b7dfa8f96530fb9a3a3aa971e03970f168
Reviewed-on: https://go-review.googlesource.com/c/go/+/569195
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
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cmd/go/internal/modload: make it clear -mod can't be set in some cases

We check that -mod can't be set to mod in workspace mode, but then we
set BuildMod to mod for go work sync below. Make it clear that that's
okay because we can't pass -mod=mod to go work sync (or the other go
mod commands that can run in workspace mode that set mod=mod: go mod
graph, go mod verify, and go mod why).

Change-Id: Idfe6fea6a420211886e4f838e050be4bf7d1b71d
Reviewed-on: https://go-review.googlesource.com/c/go/+/497617
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
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os: don't normalize volumes to drive letters in os.Readlink

This CL updates os.Readlink so it no longer tries to normalize volumes
to drive letters, which was not always even possible.

This behavior is controlled by the `winreadlinkvolume` setting.
For Go 1.23, it defaults to `winreadlinkvolume=1`.
Previous versions default to `winreadlinkvolume=0`.

Fixes #63703.

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Reviewed-on: https://go-review.googlesource.com/c/go/+/567735
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cmd/go: respect -coverpkg for unselected no-test packages

This patch fixes a bug in the code that reports coverage percentages
and/or profiles for packages without tests. Specifically, the code
added as part of the fix for issue 24570 (in CL 495447) didn't
properly consider the -coverpkg selection and would look for the build
action meta-data file for a package that wasn't actually selected for
coverage.

Fixes #65653.

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slices: simplify rotate code

The rotate-by-reverse code in fact does only 2 writes per entry, so
it is fine and simpler.

Change-Id: I5feea9698b5575f1f0ae9069cc1d074643529262
Reviewed-on: https://go-review.googlesource.com/c/go/+/562321
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net/http: adjust wording on ServeMux godoc

When reading through the docs, I found that the sentence flows better with
the `to` present.

Change-Id: I51c21fa33c7a13748c0814dd87c76b9a8d64e2ec
GitHub-Last-Rev: 0642bd7185343ba562c7057071d4689ead7a378e
GitHub-Pull-Request: golang/go#63587
Reviewed-on: https://go-review.googlesource.com/c/go/+/535935
Reviewed-by: Damien Neil <dneil@google.com>
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os: don't treat mount points as symbolic links

This CL changes the behavior of os.Lstat to stop setting the
os.ModeSymlink type mode bit for mount points on Windows. As a result,
filepath.EvalSymlinks no longer evaluates mount points, which was the
cause of many inconsistencies and bugs.

Additionally, os.Lstat starts setting the os.ModeIrregular type mode bit
for all reparse tags on Windows, except for those that are explicitly
supported by the os package, which, since this CL, doesn't include mount
points. This helps to identify files that need special handling outside
of the os package.

This behavior is controlled by the `winsymlink` GODEBUG setting.
For Go 1.23, it defaults to `winsymlink=1`.
Previous versions default to `winsymlink=0`.

Fixes #39786
Fixes #40176
Fixes #61893
Updates #63703
Updates #40180
Updates #63429

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net/http/cgi: close res.Body

Change-Id: I4682442f4f9f3d112b78582c3b9fc2d24c2d58a7
GitHub-Last-Rev: 0823701905b8facdde7204aa6d90df6facd6dc51
GitHub-Pull-Request: golang/go#66049
Reviewed-on: https://go-review.googlesource.com/c/go/+/568316
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Auto-Submit: Damien Neil <dneil@google.com>

cmd/go: add file with list of all counters we collect

Maintain a list of counters we collect and test that it hasn't
changed. If it has, fail a test and have the user update the list. The
update process will print a reminder to update the list of collected
counters.

Also run go mod vendor to pull in
golang.org/x/telemetry/counter/countertest.

For #58894

Change-Id: I661a9c3d67cb33f42a5519f4639af7aa05c3821d
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cmd/compile/internal: replace direct calls to Sym.LinksymABI

Using (*Sym).LinksymABI(abi) directly is not recommended.

Replace with (*ir.Name).LinksymABI(abi).

Change-Id: I95d5d35240d4e1856ba511d828f6edefcee81b4f
GitHub-Last-Rev: 6787b65716ab82d2f35cda4f3839bfd85baa41dd
GitHub-Pull-Request: golang/go#66094
Reviewed-on: https://go-review.googlesource.com/c/go/+/568855
Auto-Submit: Keith Randall <khr@golang.org>
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runtime: use .Pointers() instead of manual checking

Change-Id: Ib78c1513616089f4942297cd17212b1b11871fd5
GitHub-Last-Rev: f97fe5b5bffffe25dc31de7964588640cb70ec41
GitHub-Pull-Request: golang/go#65819
Reviewed-on: https://go-review.googlesource.com/c/go/+/565515
Reviewed-by: Jorropo <jorropo.pgm@gmail.com>
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Reviewed-by: Keith Randall <khr@golang.org>

cmd/compile/internal: use reflectdata.TypeLinksym

As the document of Sym.Linksym said, we replace
reflectdata.TypeSym(t).Linksym() with reflectdata.TypeLinksym(t).

Change-Id: I578eb159e552e60cd05d2aa1560f91797a6629ef
GitHub-Last-Rev: d096cba8f08506d7c5248dbf0179e5aef77e8f65
GitHub-Pull-Request: golang/go#66088
Reviewed-on: https://go-review.googlesource.com/c/go/+/568715
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
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doc/go1.23: document database/sql wrap errors

For #64707.
For #65614.

Change-Id: Ib07ac67d7652bc7c9e1363f70637938c7bb4bc72
GitHub-Last-Rev: a4d8ecacbc677111e39977bacfb8fb9b59fb4ce6
GitHub-Pull-Request: golang/go#66089
Reviewed-on: https://go-review.googlesource.com/c/go/+/568755
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internal/xcoff: fix typo in comment

Change-Id: I72f73016d0d1ba4f686bafd4ee62a43e4e38aead
GitHub-Last-Rev: 8c824caa3c7c5ac38fd59a1070d0f11d7e5fecfd
GitHub-Pull-Request: golang/go#66082
Reviewed-on: https://go-review.googlesource.com/c/go/+/568655
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
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math/rand, math/rand/v2: rename receiver variables

According to the https://go.dev/wiki/CodeReviewComments#receiver-names

Change-Id: Ib8bc57cf6a680e5c75d7346b74e77847945f6939
Reviewed-on: https://go-review.googlesource.com/c/go/+/568635
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lib/time: use consistent directory in mkzip usage message

Change-Id: I6de70064222038d7d15557be9e85b66f944ac554
GitHub-Last-Rev: fe7d6e94903620a525584eceec00e4801de0faa2
GitHub-Pull-Request: golang/go#66021
Reviewed-on: https://go-review.googlesource.com/c/go/+/568077
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fmt: allow padding and minus flags at the same time

Existing implementation did not allow setting both padding and minus flags at the same time because standard formatting does not allow that. But custom Formatter interface implementations might have use of it. This change moves the check from the place flags are parsed to where they are used in standard formatting.

Fixes #61784

Change-Id: If5909d45dc929ddf911453e1056a4661abe76e52
GitHub-Last-Rev: d99ec55d3bbd9b2a8f14c8ade2fb25d6e0c174c3
GitHub-Pull-Request: golang/go#61836
Reviewed-on: https://go-review.googlesource.com/c/go/+/516975
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
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doc: fix typo of gotypesalias

Change-Id: I943a7794dab919b7377661a4b9e2e1d9865f2922
GitHub-Last-Rev: 2a66fce2734bc453651c22968e2d55e157885398
GitHub-Pull-Request: golang/go#66063
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cmd/internal/buildid: fix typo in comment

Change-Id: I271f25aefaace61935d55a1b6b7c026d022d92a7
GitHub-Last-Rev: 304e3ee979f4fde58184e7035cd5d0d6b50bca74
GitHub-Pull-Request: golang/go#66023
Reviewed-on: https://go-review.googlesource.com/c/go/+/567918
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reflect: clean up unnecessary comments for rtype

For consistency, this CL cleans up unnecessary comments,
and moves these Overflow methods to exported area.

For #60427

Change-Id: I14d4ffbc3552d31c211ea1e0b7a0f7090a4a8b89
GitHub-Last-Rev: acdc6ad51bd9ad60a34fdfa8f00a7652cbe34510
GitHub-Pull-Request: golang/go#66019
Reviewed-on: https://go-review.googlesource.com/c/go/+/567917
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cmd/compile: remove bug workarounds in prove's loop inversion

I wrote theses checks because I got bad panics on some innocent functions,
turns out I was working around #63955 but I was not aware of that at the time.

The proper fix was included in CL 539977 this is now doing nothing.

Change-Id: I89329329933527b6f3cb817dc1e039a38f58da9a
Reviewed-on: https://go-review.googlesource.com/c/go/+/560975
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
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cmd/go/internal/vcs: use git log to avoid unnecessary objects

"git show" by default shows the diff from the previous commit. "-s"
suppress all output from the diff machinery. But it will still try to
fetch the relevant objects, which may be unavailable if the repository
is a partial clone.

Use "git log" instead, which only needs the commit object.

Fixes #65339

Change-Id: I766a680321cd22d5fdbd08d24cb777ef964bdb7c
GitHub-Last-Rev: 87a8ba435251f2a72aa18f2820ccb8ea5b379d69
GitHub-Pull-Request: golang/go#65341
Reviewed-on: https://go-review.googlesource.com/c/go/+/559075
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crypto: use and test purego tag consistently

Fixes #58636
Updates #23172

Change-Id: I578a5597f467be45a7d6fb7582b24855b2e6512b
Reviewed-on: https://go-review.googlesource.com/c/go/+/561935
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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syscall: call internal/runtime/syscall.Syscall6 in RawSyscall6

For #65355

Change-Id: I9168d9a767e3b2ece65ac6dcab6827ab6f6b11bb
Reviewed-on: https://go-review.googlesource.com/c/go/+/560136
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src/cmd: update golang.org/x/telemetry to 3d5706d and vendor it

Ran commands:
go get golang.org/x/telemetry@3d5706d
go mod vendor

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doc: close HTML tags

Add unclosed HTML tags and remove redundant </a> tags.

Change-Id: I3fffbcfd640001c9cc4f6085150344daa0c4369b
Reviewed-on: https://go-review.googlesource.com/c/go/+/568155
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bytes: add a colon after Output to make the Example in the document display correctly

The document address currently showing the problem is: https://pkg.go.dev/bytes#Buffer.ReadByte

Change-Id: Ib52747e38f72541f3ca2a595aa8eca5d91281c80
Reviewed-on: https://go-review.googlesource.com/c/go/+/568135
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os/exec: remove unnecessary fmt.Sprintf call

Change-Id: Ic0ac97a15dadd756d727fd8abe23359b0347af19
GitHub-Last-Rev: a96a3f5fe7fbfb41f38acadab3c03c4a76c89b78
GitHub-Pull-Request: golang/go#66052
Reviewed-on: https://go-review.googlesource.com/c/go/+/568317
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os: remove if nil!=nil in openFileNolog

Change-Id: I21cecc13570f3b61f3d6c4fede18dc63ddca1b69
GitHub-Last-Rev: 3c351e4aa84780d682fd7595ac2091defdcdfc62
GitHub-Pull-Request: golang/go#65958
Reviewed-on: https://go-review.googlesource.com/c/go/+/567355
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cmd/compile: add 0-sized-value simplification to copyelim

The problem was caused by faulty handling of unSSA-able
operations on zero-sized data in expand calls, but there
is no point to operations on zero-sized data.  This CL adds
a simplify step to the first place in SSA where all values
are processed and replaces anything producing a 0-sized
struct/array with the corresponding Struct/Array Make0
operation (of the appropriate type).

I attempted not generating them in ssagen, but that was a
larger change, and also had bugs. This is simple and obvious.
The only question is whether it would be worthwhile to do it
earlier (in numberlines or phielem).

Fixes #65808.

Change-Id: I0a596b3d272798015e7bb6b1a20411241759fe0e
Reviewed-on: https://go-review.googlesource.com/c/go/+/568258
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
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cmd/link/internal/riscv64: generate local text symbols for R_RISCV_CALL

Correctly generate local text symbols needed for R_RISCV_CALL when
external linking. R_RISCV_CALL was added in CL #520095 as a way of
marking AUIPC+JALR pairs, instead of overloading R_RISCV_PCREL_ITYPE.
However, genSymsLate was not updated to generate local text symbols
for the new relocation type, leading to HI20 symbol lookup failures.

This issue is detected by cmd/internal/obj/riscv.TestLargeCall,
however this is unfortunately skipped in short mode.

Fixes #65646

Change-Id: I8ee0f13791e0628f31657bf7dae2be8482b689b5
Reviewed-on: https://go-review.googlesource.com/c/go/+/567375
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
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cmd/compile: add missing Unalias call when writing type alias

Fixes #65778

Change-Id: I93af42967c7976d63b4f460b7ffbcb9a9c05ffe7
Reviewed-on: https://go-review.googlesource.com/c/go/+/565995
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Jorropo <jorropo.pgm@gmail.com>

cmd/compile: remove unnecessary fmt.Sprintf call

Change-Id: I38ba7cb0179ec9226a68629c53ea2d81fa19c059
GitHub-Last-Rev: a3d4fe2ac2d2f40033ae0244a264074d45b3ad52
GitHub-Pull-Request: golang/go#66024
Reviewed-on: https://go-review.googlesource.com/c/go/+/568115
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
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Commit-Queue: Ian Lance Taylor <iant@google.com>
Reviewed-by: qiulaidongfeng <2645477756@qq.com>
Auto-Submit: Robert Griesemer <gri@google.com>

cmd/internal/testdir: support -godebug

Similar with what we are doing for -goexperiment.

For #65778

Change-Id: I7dda69512a3ffb491e3de31941ae1c3d34fececf
Reviewed-on: https://go-review.googlesource.com/c/go/+/568156
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

go/types, types2: consistently use error_ type for sub-errors (cleanup)

Also, rename reportAltDecl/recordAltDecl to addAltDecl and
move function into errors.go.

Change-Id: Ie5210d1989f1e51fc5fec483dfa6dba8c4212b59
Reviewed-on: https://go-review.googlesource.com/c/go/+/567616
Reviewed-by: Robert Findley <rfindley@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
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go/types: generate typeset.go from types2 source

To simplify the translation, use extra atPos calls where needed
in the respective types2 source.

This CL reduces the amount of code that needs to be maintained
manually by about 420 LOC.

Change-Id: I839844a6e85ccb1111d76c43de23127d8f9fbbce
Reviewed-on: https://go-review.googlesource.com/c/go/+/567776
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
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go/types, types2: better error position for invalid (infinite) types

Provide an explicit start position to Checker.cycleError for better
control over the reported error.

For #65711.

Change-Id: Ie3016523442d75f348a033c1b944db493943f433
Reviewed-on: https://go-review.googlesource.com/c/go/+/567916
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
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Reviewed-by: Robert Griesemer <gri@google.com>

go/types, types2: disable incorrect optimization in type validity check

Fixes #65711.

Change-Id: I3196b7d053c9868b74c53623526f2da0ab878f53
Reviewed-on: https://go-review.googlesource.com/c/go/+/567976
Reviewed-by: Robert Griesemer <gri@google.com>
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Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>

cmd/compile: soften type matching when allocating stack slots

Currently we use pointer equality on types when deciding whether we can
reuse a stack slot. That's too strict, as we don't guarantee pointer
equality for the same type. In particular, it can vary based on whether
PtrTo has been called in the frontend or not.

Instead, use the type's LinkString, which is guaranteed to both be
unique for a type, and to not vary given two different type structures
describing the same type.

Update #65783

Change-Id: I64f55138475f04bfa30cfb819b786b7cc06aebe4
Reviewed-on: https://go-review.googlesource.com/c/go/+/565436
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>

net/http: remove Content-Length header in http.Error

Error replies to a request with an error message and HTTP code.
Delete any preexisting Content-Length header before writing the header;
if a Content-Length is present, it's probably for content that the
caller has given up on writing.

For #50905

Change-Id: Ia3d4ca008be46fa5d41afadf29ca5cacb1c47660
Reviewed-on: https://go-review.googlesource.com/c/go/+/554216
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>

runtime: move per-P timers state into its own struct

Continuing conversion from C to Go, introduce type timers
encapsulating all timer heap state, with methods for operations.
This should at least be easier to think about, instead of having
these fields strewn through the P struct. It should also be easier
to test.

I am skeptical about the pair of atomic int64 deadlines:
I think there are missed wakeups lurking.
Having the code in an abstracted API should make it easier
to reason through and fix if needed.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: If5ea3e0b946ca14076f44c85cbb4feb9eddb4f95
Reviewed-on: https://go-review.googlesource.com/c/go/+/564132
Reviewed-by: Austin Clements <austin@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Russ Cox <rsc@golang.org>

internal/trace: fix typo in comment

Change-Id: I7c82426ea9eb8ed100af08cd5aa302e9582055b3
GitHub-Last-Rev: 23535cd52f03ec611c8a11b4ac3993137cbc6655
GitHub-Pull-Request: golang/go#66013
Reviewed-on: https://go-review.googlesource.com/c/go/+/568075
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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encoding/json: make use of reflect.Type.{OverflowInt, OverflowUint}

CL 567296 added {OverflowComplex, OverflowFloat, OverflowInt, OverflowUint}
to reflect.Type, this CL uses these methods to simplify code.

For #60427

Change-Id: I229aef9e4095a2f025afd782081f6c9e6d7710f3
GitHub-Last-Rev: c824e5a1b5547e2cc23142fbcf0d6dd59f0e8506
GitHub-Pull-Request: golang/go#66000
Reviewed-on: https://go-review.googlesource.com/c/go/+/567775
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Joseph Tsai <joetsai@digital-static.net>
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Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

cmd/go/internal/envcmd: show GODEBUG in 'go env' output

Fixes #65777

Change-Id: I62067d8212bfd9f9475ecad036a1218ffc5c2130
GitHub-Last-Rev: a395b0293a4796e4ac5db64c1521ade4ede0dfd8
GitHub-Pull-Request: golang/go#65888
Reviewed-on: https://go-review.googlesource.com/c/go/+/566097
Reviewed-by: Bryan Mills <bcmills@google.com>
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runtime: don't re-initialize itab while looking for missing function

The itab we're initializing again, just to figure out which method
is missing, might be stored in read-only memory.
This can only happen in certain weird generics situations, so it is
pretty rare, but it causes a runtime crash when it does happen.

Fixes #65962

Change-Id: Ia86e216fe33950a794ad8e475e76317f799e9136
Reviewed-on: https://go-review.googlesource.com/c/go/+/567615
Reviewed-by: Cherry Mui <cherryyz@google.com>
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go/types, types2: add tracing to Checker.validType

Debugging support.

For #65711.

Change-Id: I2b8b03d2c6e02d32a4f9272313e852f17da35b3e
Reviewed-on: https://go-review.googlesource.com/c/go/+/567975
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
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internal/coverage/encodemeta: simplify appending zero values

Appending zero values directly.

Change-Id: Icfb6e135b6aa16662dd67bdbf64ea0f63c612b2f
GitHub-Last-Rev: 57547b94087f216e943362e507b2339dd385f568
GitHub-Pull-Request: golang/go#65291
Reviewed-on: https://go-review.googlesource.com/c/go/+/558576
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Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

text/tabwriter: add recovered panic message to rethrow

Without it, there is little information to debug why the original write
failed.

Change-Id: I21615ab7ca402115d02becdbd11bbacde55b98b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/567955
Auto-Submit: Nicolas Hillegeer <aktau@google.com>
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cmd/link: add option to enable full RELRO for ELF

-bindnow linker option enables full RELRO on ELF targets.

This options defaults to false and preserves
current behavior - partial relro for buildmode=pie.

Also, the following changes were made to align
internal linker's behavior with external ELF linkers:
- GNU_RELRO segment is marked Read-only
- .dynamic is a relro section for partial and full RELRO
- .got is a relro section for partial and full RELRO
- .got.plt is a relro section for full RELRO only

Supersedes #45681 (golang.org/cl/312509)

Change-Id: I51c4ef07b14beceb7cd6fd989f323e45f89a63ca
GitHub-Last-Rev: bc6826441065395b80a2b66cde67466c4d9bce2e
GitHub-Pull-Request: golang/go#58869
Reviewed-on: https://go-review.googlesource.com/c/go/+/473495
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runtime/cgo: ignore unknown warning options

For #65290
Fixes #65971

Change-Id: If15853f287e06b85bb1cb038b3785516d5812f84
Reviewed-on: https://go-review.googlesource.com/c/go/+/567556
Auto-Submit: Ian Lance Taylor <iant@google.com>
Commit-Queue: Ian Lance Taylor <iant@google.com>
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cmd/internal/obj/ppc64: generate smaller machine code for OR/XOR of uint32 values

These binary operations can be done in two sequential instructions instead of loading a
constant into REGTMP and doing the binary op.

Change-Id: Ie0ab863f9e81afad140b92b265bca4d3f0fe90b1
Reviewed-on: https://go-review.googlesource.com/c/go/+/565215
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
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all: run go fmt

I ran go fmt to fix format on the entire repository.

Change-Id: I2f09166b6b8ba0ffb0ba27f6500efb0ea4cf21ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/566835
Reviewed-by: Ian Lance Taylor <iant@google.com>
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testing: fix typo in comment

Change-Id: I5aa6093b0199df1ef5b0ad0fcfa651a4b990bfd5
GitHub-Last-Rev: b053d993eb497500ee63024ef12784f63fac6c0e
GitHub-Pull-Request: golang/go#65986
Reviewed-on: https://go-review.googlesource.com/c/go/+/567655
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
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crypto/internal/bigmod: remove unused ctGeq

Change-Id: I6d76fe4a307be0f976ccaeeedb6f08d672ae4851
GitHub-Last-Rev: a9554cdb47489b9160d3f03efd41898b244f13d0
GitHub-Pull-Request: golang/go#65992
Reviewed-on: https://go-review.googlesource.com/c/go/+/567675
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Reviewed-by: Filippo Valsorda <filippo@golang.org>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>

os: factor out newFileStatFromWin32FileAttributeData

The stat function is quite long on Windows. Simplify it a bit by
factoring out the creation of a fileStat from a Win32FileAttributeData.

This also makes it more consistent with the creation of fileStats
from other sources, which all have their own dedicated functions.

Change-Id: I0443f96d892b70ce7f3b5e92c5049e4e4a240c6c
Reviewed-on: https://go-review.googlesource.com/c/go/+/566435
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
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database/sql: add error check

Change-Id: Ib9f7a1a4bf23f76457dabf85610f4799502631dc
GitHub-Last-Rev: afbb86fde12d2eeaa8121c25787b0e9c290edbc7
GitHub-Pull-Request: golang/go#65947
Reviewed-on: https://go-review.googlesource.com/c/go/+/566857
Reviewed-by: Ian Lance Taylor <iant@google.com>
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encoding/xml: display closing space in error message

Fixes #48890

Change-Id: I7644d091ad92663bda52ef4905239ec499ef9207
Reviewed-on: https://go-review.googlesource.com/c/go/+/535535
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Reviewed-by: Carlos Amedee <carlos@golang.org>

runtime,runtime/pprof: avoid tiny allocations in finalizer-related tests

A few tests rely on finalizers running, but are doing tiny allocations.
These tests will break if, for example, the testing package does is own
tiny allocations before calling the test function (see CL 478955). The
tiny allocator will group these allocations together and the ones done
for the tests themselves will live longer than desired. Use types which
have/are pointers for these tests so they won't be allocated by the tiny
allocator.

While here, pick up a small refactor suggested by Michael Knyszek to use
the BlockUntilEmptyFinalizerQueue helper to wait for the finalizers to
run in TestFinalizerRegisterABI.

Change-Id: I39f477d61f81dc76c87fae215339f8a38979cf94
Reviewed-on: https://go-review.googlesource.com/c/go/+/529555
Auto-Submit: Michael Knyszek <mknyszek@google.com>
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cmd/compile/internal/syntax: rename test file to match issue

Follow-up on CL 565518 which addressed issue #65790 but added
testdata/issue65970.go instead of testdata/issue65790.go.
Rename that file to match the issue.

For #65790.

Change-Id: I647c297286355137fa950fb6722e31ae4340393b
Reviewed-on: https://go-review.googlesource.com/c/go/+/567875
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
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cmd/compile/internal/inline: refactor fixpoint algorithm

This CL refactors the interleaved fixpoint algorithm so that calls can
be inlined in any order. This has no immediate effect, but it will
allow a subsequent CL to prioritize calls by inlheur score.

Change-Id: I11a84d228e9c94732ee75f0d3c99bc90d83fea09
Reviewed-on: https://go-review.googlesource.com/c/go/+/567695
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Auto-Submit: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>

internal/abi: fix typo in comment

Change-Id: I27ad7ce266edc255c93012b24b6f275dd1512dc2
GitHub-Last-Rev: d196b48875861d4dff290fbda04546f0dedf0281
GitHub-Pull-Request: golang/go#65981
Reviewed-on: https://go-review.googlesource.com/c/go/+/567538
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>

net/http: make timeout errors match context.DeadlineExceeded

When returning an error which implements net.Error and reports
itself as a timeout, also report it as matching context.DeadlineExceeded.
This matches the behavior of timeout errors in the net package
and elsewhere.

Fixes #50856

Change-Id: I2ca911e3677a699af27ba89b1200401baa8b3b1b
Reviewed-on: https://go-review.googlesource.com/c/go/+/567537
Reviewed-by: Jonathan Amsterdam <jba@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

cmd/compile: compile len(ch) as call to runtime.chanlen

An upcoming CL will give this call more to do.
For now, separate out the compiler change that
stops inlining the computation.

Change-Id: I4c5cbd84a0694b306191bff38cc6ea2d69458d7d
Reviewed-on: https://go-review.googlesource.com/c/go/+/564556
Auto-Submit: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: use methods for timer

Continuing conversion from C to Go, change timer API to use methods.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I4cb88a366993a77aa4fad739793a7db7213cc38c
Reviewed-on: https://go-review.googlesource.com/c/go/+/564131
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: change timer.status to timer.state

The status enumeration is simple enough now that we can
view it as a bit set instead. Switch to a bit set, freeing up
the remaining bits for use in followup work to allow
garbage-collecting timers.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I5f331fe3db1b5cb52f8571091f97f8ba029f3ac9
Reviewed-on: https://go-review.googlesource.com/c/go/+/564130
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

runtime: use timer.lock in moveTimers

Continue using timer.lock to simplify timer operations.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: Iaf371315308425d132217eacb20b1e120a6833c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/564127
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: use timer.lock in adjusttimers

Continue using timer.lock to simplify timer operations.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I2298cede902cbf0aea268c54d741190007a733c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/564128
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: use timer.lock in runtimer

Continue using timer.lock to simplify timer operations.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I504335a010d6eb4d7d627145b64a896582158406
Reviewed-on: https://go-review.googlesource.com/c/go/+/564129
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

runtime: use timer.lock in cleantimers

Continue using timer.lock to simplify timer operations.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: Ic12fd2630e8ac23cddd00fa7e3240a1ac19da596
Reviewed-on: https://go-review.googlesource.com/c/go/+/564126
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

runtime: use timer.lock in modtimer

Continue using timer.lock to simplify timer operations.

Note the removal of a previous potential deadlock.
(Explained at new line 325, there was a lock inversion
between individual timer locks and the 'timers' lock.)

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I8c9be00d13c6acd171a8aa2882a4fc844498f754
Reviewed-on: https://go-review.googlesource.com/c/go/+/564125
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: add timer lock to lock ranking

No deadlocks yet!

Change-Id: I87fb3742a386d682fbcc8cb98e98771b54bc3fec
Reviewed-on: https://go-review.googlesource.com/c/go/+/564133
Reviewed-by: Austin Clements <austin@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: use timer.lock in deltimer

The state set is now simplified enough that all the CAS loops
are starting to look the same: they are just spin locks.
So introduce an actual timer.lock method and use it in deltimer.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: Ifd7f20eeede5c764ef10ecba64855c29a5ddbe39
Reviewed-on: https://go-review.googlesource.com/c/go/+/564124
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: merge timerDeleted into timerModified

When we make a change to a timer, we have to note the
desired change to t.when and then wait for the timer heap
owner to apply the change. There are two possible changes:
delete or set a new t.when. Most of the code for processing
these changes is the same, so we can simplify the code by
making both have the same state: timerDeleted is now
timerModified with t.nextwhen == 0.

This is part of a larger simplification of the state set.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I1a2a12f8250bcd40f7b08b83f22c3a82b124eda6
Reviewed-on: https://go-review.googlesource.com/c/go/+/564123
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: merge timerNoStatus into timerRemoved

For historical reasons, we have to treat a zero timer as
the same as an initialized timer that was stopped (removed).
The two states are already treated mostly identically.
Merge them.

This is part of a larger simplification of the state set.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I9c3aeb8f92bafb18c47489c1ec20a7b87ac5cd9c
Reviewed-on: https://go-review.googlesource.com/c/go/+/564122
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

runtime: merge timerMoving into timerModifying

timerMoving is just a kind of "locked for modification",
so merge it into timerModifying.

This is part of a larger simplification of the state set.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I5379122f96d9921ecda7a6a37cabd6c6b4d529a4
Reviewed-on: https://go-review.googlesource.com/c/go/+/564121
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: merge timerRemoving into timerModifying

timerRemoving is just a kind of "locked for modification",
so merge it into timerModifying. This does potentially remove
a fast path from deltimer, in that deltimer of timerRemoving
is a fast-path exit while deltimer of timerModifying has to
wait for the timer to settle. Since all the timerModifying
critical paths are bounded and short, this should not matter.

This is part of a larger simplification of the state set.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I039bf6a5a041a158dc3d1af8127f28eed50fc540
Reviewed-on: https://go-review.googlesource.com/c/go/+/564120
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: merge timerModifiedEarlier and timerModifierLater

Nothing actually needs to know the difference between these
two states, so merge them.

This is part of a larger simplification of the state set.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: Ia30699ac92e66467773942e7df1fb21470a6e51a
Reviewed-on: https://go-review.googlesource.com/c/go/+/564119
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

runtime: delete addtimer

modtimer can always be used in place of addtimer.
Do that and delete addtimer, avoiding duplicated logic.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I70291796bdac3bef5e0850f039f6f4a1da4498ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/564118
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: move all timer-locking code into time.go

No code changes, only code moves here.
Move all code that locks pp.timersLock into time.go
so that it is all in one place, for easier abstraction.

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I1b59af7780431ec6479440534579deb1a3d9d7a3
Reviewed-on: https://go-review.googlesource.com/c/go/+/564117
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

runtime: delete clearDeletedTimers

adjusttimers already contains the same logic. Use it instead.
This avoids having two copies of the code and is faster.

adjusttimers was formerly O(n log n) but is now O(n).
clearDeletedTimers was formerly O(n² log n) and is now gone!

[This is one CL in a refactoring stack making very small changes
in each step, so that any subtle bugs that we miss can be more
easily pinpointed to a small change.]

Change-Id: I32bf24817a589033dc304b359f8df10ea21f48fc
Reviewed-on: https://go-review.googlesource.com/c/go/+/564116
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>