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Commit Graph

51732 Commits

Author SHA1 Message Date
Matthew Dempsky
1cfe1007cd cmd/compile: remove typecheckdef and Name.Walkdef
The only remaining use for typecheckdef after CL 393256 is to
typecheck the ONAME node that represents function names, so we might
as well just move that code into tcFunc instead.

Updates #51691.

Change-Id: Icbca51d4b0fb33c90faa95f16254c7171b171d8a
Reviewed-on: https://go-review.googlesource.com/c/go/+/393367
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
2022-03-17 00:12:40 +00:00
Robert Findley
8d4da2c7b5 all: update vendored golang.org/x/tools
Update the vendored golang.org/x/tools to pick up the fix for #51717.

This also picks up some changes to support Fuzz tests in the tests
analyzer, but they are currently still guarded by an internal flag.

Fixes #51717
Updates #36905

Change-Id: Ibcd5006624dd9cd9797c811093985e8775c57d51
Reviewed-on: https://go-review.googlesource.com/c/go/+/393373
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Trust: Robert Findley <rfindley@google.com>
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2022-03-17 00:08:36 +00:00
Keith Randall
e5e638e512 cmd/compile: allow noop conversions when comparing expressions
Allows mapclear optimization to trigger in more cases, including
some generic instantiations.

Fixes #51699

Change-Id: Ic54f7686e5fcb8fbcad640aa77ed326d7338b938
Reviewed-on: https://go-review.googlesource.com/c/go/+/393434
Trust: Keith Randall <khr@golang.org>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2022-03-16 23:03:54 +00:00
Russ Cox
ed4db86118 cmd/api: remove debug print
Left over from CL 392414.

Change-Id: I32ff1d660ba03d6c2005ad247e2129daf83aac04
Reviewed-on: https://go-review.googlesource.com/c/go/+/393361
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
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Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
2022-03-16 20:39:14 +00:00
Cherry Mui
91631bc7e0 cmd/link: mark unexported methods for plugins
When plugin is used, we already mark all exported methods
reachable. However, when the plugin and the host program share
a common package, an unexported method could also be reachable
from both the plugin and the host via interfaces. We need to mark
them as well.

Fixes #51621.

Change-Id: I1a70d3f96b66b803f2d0ab14d00ed0df276ea500
Reviewed-on: https://go-review.googlesource.com/c/go/+/393365
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Reviewed-by: Than McIntosh <thanm@google.com>
2022-03-16 20:10:07 +00:00
Matthew Dempsky
81d3c25c6c cmd/compile: remove unused code from typecheckdef
typecheckdef used to be used to handle references to package-level
declarations that hadn't yet been typechecked yet. It's no longer
needed, as the current IR frontends construct package-level
declarations with proper types upfront.

Exception: this code is still used for compiler-generated function
declarations, so that code needs to be kept. Eventually that code can
be moved elsewhere, but for now this CL makes it obvious that the rest
of the code paths really are unused.

Updates #51691.

Change-Id: I5322edb686aaf5dc4627288f3d9ba910a017b41d
Reviewed-on: https://go-review.googlesource.com/c/go/+/393256
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
2022-03-16 18:34:31 +00:00
Matthew Dempsky
d661bdeabf cmd/compile: remove OIOTA
OIOTA used to be used to represent "iota" in the pre-typechecked IR,
before we knew whether it was safe to replace it with a constant
(because it could be redefined as a global symbol later).

However, now types2 handles constant folding, including handling of
"iota". So this can go away.

Updates #51691.

Change-Id: I3cec45b22c4c8f1c357dcc4003292c21ae32aa90
Reviewed-on: https://go-review.googlesource.com/c/go/+/393255
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
2022-03-16 18:34:22 +00:00
Matthew Dempsky
1024503f84 cmd/compile: Fatalf in Type.SetBroke(true) and Node.SetDiag(true)
Type.Broke and Node.Diag were used in the legacy typechecker to allow
reporting of multiple errors in a compilation unit, while suppressing
unhelpful follow-on errors. However, that's no longer needed now that
types2 handles (most) user-visible diagnostics.

Updates #51691.

Change-Id: I919c1598d8acebe5703939256bdca3e8d021f7ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/392918
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
2022-03-16 18:33:53 +00:00
Matthew Dempsky
a1bf50eefe cmd/compile: detect invalid NIH conversions within unified IR
Unified IR currently relies on typecheck to diagnose invalid
//go:notinheap conversions, which prevents removing all of
its (otherwise) dead error-reporting code.

This CL updates the unified IR reader to instead proactively diagnose
these invalid conversions. This logic can be removed again once #46731
is implemented, but in the mean time it allows progress on #51691.

Updates #46731.
Updates #51691.

Change-Id: Ifae81aaad770209ec7a67bc10b55660f291e403e
Reviewed-on: https://go-review.googlesource.com/c/go/+/392917
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
2022-03-16 18:30:48 +00:00
Bryan C. Mills
c0158b6a00 go/internal/srcimporter: use the 'go' command from the Importer's GOROOT
We have no guarantee in general that there is any 'go' command in
$PATH at all, let alone the correct one. However, we can expect that
if a 'go' command is not in scope, the Importer should have a correct
GOROOT setting: otherwise, it would not be able to import anything
from 'std' at all.

Given that information, when we run `go tool cgo` we should use
GOROOT/bin/go specifically, not whatever 'go' we find in $PATH.

This fixes a failure in go/types.TestStdlib that manifests as a
timeout in when the 'go' command is not present in $PATH, due to
repeated retries for every package that transitively depends on
runtime/cgo.

For #51461

Change-Id: I30cc4613f6f02a04e83c8d55657ef01888c7770f
Reviewed-on: https://go-review.googlesource.com/c/go/+/391807
Trust: Bryan Mills <bcmills@google.com>
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2022-03-16 17:41:38 +00:00
Russ Cox
3efc7215cb fmt, strconv: document use of Unicode replacement character in %q
Fixes #51526.

Change-Id: I365a763454bd201f804df29f800416b1731b8ebc
Reviewed-on: https://go-review.googlesource.com/c/go/+/390436
Trust: Russ Cox <rsc@golang.org>
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Reviewed-by: Rob Pike <r@golang.org>
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2022-03-16 16:28:38 +00:00
Kir Kolyshkin
33e752edd3 syscall: ensure that Getwd returns absolute path
Since Linux kernel 2.6.36, the pathname returned by the getcwd() system
call can be prefixed with the string "(unreachable)" in some cases [1].

Getcwd should return an absolute path, and doing otherwise is a
conformance issue; it also can be dangerous, since the path returned
can be an existing relative path.

Fix by returning ENOENT in case the path is not absolute. This is
essentially the same as what glibc does (since [2]).

[1] https://man7.org/linux/man-pages/man2/getcwd.2.html#BUGS
[2] https://sourceware.org/git/?p=glibc.git;a=commit;h=52a713fdd0a30e1bd79818e2e3c4ab44ddca1a94

Change-Id: I444c80eb3c836ff7d32c64c8b65d5112fa8c710f
Reviewed-on: https://go-review.googlesource.com/c/go/+/387174
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
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2022-03-16 16:07:26 +00:00
Russ Cox
a3fcc755db internal/txtar: bring back to main repo, for tests in std
This used to be cmd/go/internal/txtar,
and then it was moved to golang.org/x/tools/txtar
and revendored from there into cmd/vendor/golang.org/x/tools/txtar.

We have a use for txtar in a new test in the standard library,
which cannot access cmd/vendor. But we also don't really want
to vendor it into the standard library as is, because that would
be the first vendoring of x/tools in std, and it would be better
to keep std separate from x/tools, even for testing.

Instead, since a little copying is better than a little dependency,
just make a copy in internal/txtar. The package does not change.

Having done that, replace the uses in cmd/go so that there's
only one copy in the main repo.

Change-Id: I70b5cc05da3f6ebcc0fd9052ebcb3d369fb57956
Reviewed-on: https://go-review.googlesource.com/c/go/+/384254
Trust: Russ Cox <rsc@golang.org>
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2022-03-16 16:06:15 +00:00
Cherry Mui
95395fdbe3 syscall: call ABIInternal entersyscall on register ABI platforms
Currently, when register ABI is used, syscall.Syscall calls
entersyscall via a wrapper, so the actual entersyscall records the
caller PC and SP of the wrapper. At the point of the actual
syscall, the wrapper frame is gone, so the recorded PC and SP are
technically invalid. Furthermore, in some functions on some
platforms (e.g. Syscall9 on NetBSD/AMD64), that frame is
overwritten. If we unwind the stack from the recorded syscallpc
and syscallsp, it may go wrong. Fix this by calling the
ABIInternal function directly.

exitsyscall calls are changed as well. It doesn't really matter,
just changed for consistency.

Change-Id: Iead8dd22cf32b05e382414fef664b7c4c1719b7c
Reviewed-on: https://go-review.googlesource.com/c/go/+/376356
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
2022-03-16 15:40:39 +00:00
Bryan C. Mills
1a2f726195 runtime/pprof: do not require a GOROOT/src prefix in tests
When paths are trimmed, the reported file locations begin with the
package import path (not GOROOT/src).

Updates #51461

Change-Id: Idbd408a02e8d03329d10e30b0b08263e69e66285
Reviewed-on: https://go-review.googlesource.com/c/go/+/391812
Trust: Bryan Mills <bcmills@google.com>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
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2022-03-16 15:20:22 +00:00
fanzha02
5fd0ed7aaf cmd/compile: set conversions to unsafe.Pointer as an escaping operation when -asan is enabled
When ASan is enabled, treat conversions to unsafe.Pointer as
an escaping operation. In this way, all pointer operations on
the stack objects will become operations on the escaped heap
objects. As we've already supported ASan detection of error
memory accesses to heap objects. With this trick, we can use
-asan option to report errors on bad stack operations.

Add test cases.

Updates #44853.

CustomizedGitHooks: yes
Change-Id: I4e7fe46a3ce01f0d219e6a67dc50f4aff7d2ad87
Reviewed-on: https://go-review.googlesource.com/c/go/+/325629
Trust: Fannie Zhang <Fannie.Zhang@arm.com>
Reviewed-by: Keith Randall <khr@golang.org>
2022-03-16 07:03:20 +00:00
Meng Zhuo
d34287a4f6 cmd/link: default generic ABI compression for ELF
This CL change all debug dwarf headers to generic ABI
"Compression header" for ELF
(http://www.sco.com/developers/gabi/latest/ch4.sheader.html#compression_header)

Fixes #50796

Change-Id: I188625e596f11cd120dbd802ac2d79341d5eaf41
Reviewed-on: https://go-review.googlesource.com/c/go/+/380755
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2022-03-16 05:32:52 +00:00
Matthew Dempsky
6e49c592de go/types: return Universe for (*Package)(nil).Scope()
Port of go.dev/cl/325469.

Fixes #46594.

Change-Id: I4bcdafecaa86885360599c204678871646bb221b
Reviewed-on: https://go-review.googlesource.com/c/go/+/385997
Trust: Matthew Dempsky <mdempsky@google.com>
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2022-03-16 00:34:27 +00:00
Matthew Dempsky
1cb34fbb26 go/types, cmd/compile: remove unused Interface.obj field
Change-Id: I6d0f629f9c7379074a03c8f13b99924d872872a3
Reviewed-on: https://go-review.googlesource.com/c/go/+/385996
Trust: Matthew Dempsky <mdempsky@google.com>
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2022-03-16 00:34:15 +00:00
Russ Cox
0d71234ee4 reflect: avoid panic in reflect.Kind.String for negative Kind
Kind(-1).String() used to panic; let's not.

Change-Id: I1dfc0e3298beb37d77713d8327579bbde90dd156
Reviewed-on: https://go-review.googlesource.com/c/go/+/393015
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2022-03-15 20:06:05 +00:00
Cherry Mui
db3045b4be cmd/asm: support -d=pctab flag
To debug PC data generation.

Change-Id: Id7ac8d607cc27ad52db490bd758c3a768c3e1df2
Reviewed-on: https://go-review.googlesource.com/c/go/+/388015
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2022-03-15 18:37:49 +00:00
Bryan Mills
b4428325e2 Revert "os: raise open file rlimit at startup"
This reverts CL 392415.

Reason for revert: new test is failing on at least darwin-amd64-10_14, darwin-amd64-10_15, and openbsd-arm64-jsing.

Updates #46279.

Change-Id: I2890b72f8ee74f31000d65f7d47b5bb0ed5d6007
Reviewed-on: https://go-review.googlesource.com/c/go/+/393016
Trust: Bryan Mills <bcmills@google.com>
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2022-03-15 18:09:24 +00:00
Ian Lance Taylor
201a2e9c2f compress/gzip: add example of compressing reader
For #51092

Change-Id: If0a233651ac75f113569ddfffd056084f6092564
Reviewed-on: https://go-review.googlesource.com/c/go/+/389514
Trust: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Joseph Tsai <joetsai@digital-static.net>
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2022-03-15 17:59:01 +00:00
Ian Lance Taylor
4e26ab0ed8 cmd/go: document that 'go run' strips debug info
Change-Id: Ie7293a33862853ac56ee0a9017b201d8ff0ba1f0
Reviewed-on: https://go-review.googlesource.com/c/go/+/392574
Trust: Ian Lance Taylor <iant@golang.org>
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2022-03-15 17:29:54 +00:00
Russ Cox
1178255f85 all: untab /* */ doc comments
A long time ago, gofmt insisted on inserting tabs in /* */ comments
at the top level of the file, like this:

	/*
		Package doc comment.
	*/
	package p

Gofmt still insists on the tab for comments not at top level,
but it has relaxed the rules about top-level comments.
A few very old doc comments are indented, left over from the old rule.

We are considering formatting doc comments, and so to make
everything consistent, standardize on unindented doc comments
by removing tabs in the few doc comments that are still indented this way.

Also update some cmd/gofmt testdata to match.

Change-Id: I293742e39b52f8a48ec41f72ca4acdafa7ce43bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/384261
Trust: Russ Cox <rsc@golang.org>
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2022-03-15 17:17:30 +00:00
Keith Randall
9b112cec83 internal/cpu: don't run SSE3 disable test if GOAMD64>1
That feature can't be disabled if the microarchitectural version
requires it.

Change-Id: Iad8aaa8089d2f023e9ae5044c6da33224499f09b
Reviewed-on: https://go-review.googlesource.com/c/go/+/392994
Run-TryBot: Keith Randall <khr@golang.org>
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2022-03-15 17:04:57 +00:00
Russ Cox
b054c7dc17 os: raise open file rlimit at startup
Some systems set an artificially low soft limit on open file count,
for compatibility with code that uses select and its hard-coded
maximum file descriptor (limited by the size of fd_set).

Go does not use select, so it should not be subject to these limits.
On some systems the limit is 256, which is very easy to run into, even
in simple programs like gofmt when they parallelize walking a file tree.

After a long discussion on go.dev/issue/46279, we decided the best
approach was for Go to raise the limit unconditionally for itself, and
then leave old software to set the limit back as needed. Code that
really wants Go to leave the limit alone can set the hard limit, which
Go of course has no choice but to respect.

Fixes #46279.

Change-Id: Id6107503437d47a870a41be25e822fc79cea08b2
Reviewed-on: https://go-review.googlesource.com/c/go/+/392415
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2022-03-15 15:21:54 +00:00
Archana R
7b15e297a2 cmd/compile: fix PrefetchStreamed builtin implementation on PPC64
This CL fixes encoding of PrefetchStreamed on PPC64 to be consistent
with what is implemented on AMD64 and ARM64 platforms which is
prefetchNTA (prefetch non-temporal access). Looking at the definition
of prefetchNTA, the closest corresponding Touch hint (TH) value to be
used on PPC64 is 16 that states that the address is accessed in a
transient manner. Current usage of TH=8 may cause degraded
performance.

Change-Id: I393bf5a9b971a22f632b3cbfb4fa659062af9a27
Reviewed-on: https://go-review.googlesource.com/c/go/+/390316
Reviewed-by: Paul Murphy <murp@ibm.com>
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2022-03-15 15:12:55 +00:00
Ian Lance Taylor
e475cf2e70 syscall: add race annotations to Windows ReadFile and WriteFile
For #51618
Fixes #51673

Change-Id: Ie63408d62303293d80afed8d5cf1cb164a8abecc
Reviewed-on: https://go-review.googlesource.com/c/go/+/392774
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2022-03-15 02:22:54 +00:00
fanzha02
49f16625c8 cmd/internal/obj/arm64: add TRN1 and TRN2 instructions support
Add test cases.

Fixes #51628

Change-Id: I433367d87e6bb5da5579c4be540079b92701c1fa
Reviewed-on: https://go-review.googlesource.com/c/go/+/392294
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Trust: Fannie Zhang <Fannie.Zhang@arm.com>
2022-03-15 01:25:23 +00:00
eric fang
44a0da4ff1 cmd/internal/obj/arm64: refactor the handling of shifted RSP
Some arithmetic operation instructions such as ADD and SUB support two
formats of left shift (<<) operation, namely shifted register format and
extended register format. And the encoding, supported registers and shifted
amount are both different.

The assembly parser doesn't distinguish them and parses them into TYPE_SHIFT
type, because the parser can't tell them apart and in most cases extended
left-shift can be replaced by shifted left-shift. The only exception is
when the second source register or the destination register is RSP.

This CL converts this case into the extended format in the preprocess stage,
which helps to simplify some of the logic of the new assembler implementation
and also makes this situation look more reasonable.

Change-Id: I2cd7d2d663b38a7ba77a9fef1092708b8cb9bc3d
Reviewed-on: https://go-review.googlesource.com/c/go/+/311709
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2022-03-15 01:00:36 +00:00
Rob Pike
41a82aa9c3 text/template/parse: allow space after continue or break
Trivial fix: We must skip space after either of these keywords
before we expect a closing delimiter.

Also delete the stutter-generating extra 'in' in the error message.
(See what I did there?)

Fixes #51670

Change-Id: If5415632c36eaac6699bdc0aa6ce18be956c9b53
Reviewed-on: https://go-review.googlesource.com/c/go/+/392615
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
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2022-03-15 00:19:35 +00:00
Keith Randall
15728ce950 cmd/compile: disable rewrite loop detector for deadcode-only changes
We're guaranteed we won't infinite loop on deadcode-only changes,
because each change converts valid -> invalid, and there are only a
finite number of valid values.

The loops this test is looking for are those generated by rule
applications, so it isn't useful to check for loops when rules aren't
involved.

Fixes #51639

Change-Id: Idf1abeab9d47baafddc3a1197d5064faaf07ef78
Reviewed-on: https://go-review.googlesource.com/c/go/+/392760
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2022-03-15 00:05:18 +00:00
Russ Cox
b7041c7ad1 cmd/api: require proposal # for new API features
Having the proposal numbers recorded in the API files
should help significantly when it comes time to audit
the new API additions at the end of each release cycle.

Change-Id: Id18e8cbdf892228a10ac17e4e21c7e17de5d4ff7
Reviewed-on: https://go-review.googlesource.com/c/go/+/392414
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2022-03-14 21:43:16 +00:00
Keith Randall
5ccd8e5133 internal/cpu: disallow disabling options that are required for microarch
e.g., if GOAMD64=v3, don't allow GODEBUG=cpu.XXX=off for XXX which
are required for v3.

Change-Id: Ib58a4c8b13c5464ba476448ba44bbb261218787c
Reviewed-on: https://go-review.googlesource.com/c/go/+/391694
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2022-03-14 21:23:36 +00:00
Robert Griesemer
41fe746857 go/types, types2: use correct underlying type in union set computation
Fixes #51658.

Change-Id: Ibf415d7e12849b8f50b58d74713613d4e65bc347
Reviewed-on: https://go-review.googlesource.com/c/go/+/392575
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2022-03-14 18:03:37 +00:00
Cuong Manh Le
8419ec295c cmd/compile: fix wrong dict param when getting dict type
CL 338129 added getDictionaryType to get the dictionary type from the
specified dict param, but still using the one in info.dictParam, which
is wrong.

Fixes #51413

Change-Id: Ie13460c1e5751c4c5fc44479a44f6eed8b3b06e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/391994
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2022-03-14 17:55:47 +00:00
Bryan C. Mills
676858f3d4 cmd/go: use testGOROOT in TestListTemplateContextFunction
This test uses testgo to run 'go list', so it should use the correct
GOROOT for testgo. (This may be particularly relevant when the test
binary itself is build with -trimpath, in which case runtime.GOROOT()
is not valid.)

Updates #51483

Change-Id: I79b310f88e3a200122d6289073df1385e3e97cca
Reviewed-on: https://go-review.googlesource.com/c/go/+/391801
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2022-03-14 17:51:51 +00:00
Bryan C. Mills
d99ff03821 go/build: set PWD for go subcommands
Since these commands already include an explicit Env field,
they will not be fixed automatically by proposal #50599.

Change-Id: Ia8157a71cf0cfe208bdc0da9aef54be3d26c795f
Reviewed-on: https://go-review.googlesource.com/c/go/+/391804
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2022-03-14 16:40:05 +00:00
Bryan C. Mills
471d319fb2 debug/buildinfo: use testenv.GoToolPath in tests instead of resolving "go" from $PATH
Updates #37475.

Change-Id: I8c3237438da3e9521ce3be26a0b5d5ca36944b17
Reviewed-on: https://go-review.googlesource.com/c/go/+/391803
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2022-03-14 16:33:16 +00:00
Cuong Manh Le
7900576bac cmd/compile: remove unified IR stmtTypeDeclHack
After CL 385998, unified IR quirks mode was gone, it's time to remove
stmtTypeDeclHack, too.

Change-Id: Id73dd1d6c11b91c0c6c6cbe85f1b06977a9876d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/392214
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2022-03-14 11:03:14 +00:00
Uzondu Enudeme
ab0f7611d7 net/url: add OmitHost bool to url.URL
Previously, myscheme:/path and myscheme:///path were treated as the same URL
although materially different. The distinction made clear by RFC 3986 sec. 5.3 where
a different recomposition behavior is expected when a URI reference has an undefined
host(authority) as in myscheme:/path vs. one with an empty host(authority)
as in myscheme:///path.

This change fixes the Parse/String roundtrip limitation for URLs with an undefined
host and a single slash.

Fixes #46059

Change-Id: I1b8d6042135513616374ff8c8dfb1cdb640f8efe
Reviewed-on: https://go-review.googlesource.com/c/go/+/391294
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
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2022-03-14 09:19:01 +00:00
Tobias Klauser
3c2e73c8c3 runtime/pprof: use syscall.RUSAGE_SELF
Change-Id: Idc37429de5a48e708eda868ca7fa26b28620bac0
Reviewed-on: https://go-review.googlesource.com/c/go/+/391854
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2022-03-13 21:31:06 +00:00
Ian Lance Taylor
842d37ee5f syscall: add race annotations to Pread and Pwrite
Fixes #51618

Change-Id: Ife894d8c313dce8c4929f40fa0ac90a069f77a89
Reviewed-on: https://go-review.googlesource.com/c/go/+/391954
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2022-03-12 23:32:36 +00:00
eh-steve
baf61e4a67 encoding/hex: implement Decode with a lookup table
Implement hex decode using a 256 byte lookup table instead of branching logic.

In happy flow, uses 3x 64 byte (or 5x 32 byte) cache lines.

	name             old time/op    new time/op    delta
	Decode/256-64       223ns ± 3%     135ns ± 2%  -39.64%  (p=0.000 n=8+8)
	Decode/1024-64      872ns ± 2%     512ns ± 2%  -41.25%  (p=0.000 n=8+8)
	Decode/4096-64     3.43µs ± 1%    2.01µs ± 2%  -41.31%  (p=0.001 n=7+7)
	Decode/16384-64    13.9µs ± 1%     8.0µs ± 1%  -42.69%  (p=0.000 n=8+7)

	name             old speed      new speed      delta
	Decode/256-64    1.15GB/s ± 3%  1.90GB/s ± 2%  +65.66%  (p=0.000 n=8+8)
	Decode/1024-64   1.17GB/s ± 2%  2.00GB/s ± 2%  +70.22%  (p=0.000 n=8+8)
	Decode/4096-64   1.20GB/s ± 1%  2.04GB/s ± 2%  +70.39%  (p=0.001 n=7+7)
	Decode/16384-64  1.18GB/s ± 1%  2.06GB/s ± 1%  +74.49%  (p=0.000 n=8+7)

Also reduces amd64 object size by 766 bytes, despite the extra RODATA due to removal of `fromHexChar()` and duplicated inlined versions of it and simplification of `Decode()`.

Change-Id: I0988c7a30562ec154eff11db6e27954e0ce2b611
GitHub-Last-Rev: 64818018af
GitHub-Pull-Request: golang/go#51432
Reviewed-on: https://go-review.googlesource.com/c/go/+/390037
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
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2022-03-11 21:51:20 +00:00
Paul E. Murphy
7b1ba972dc cmd/asm: add support for bdnz/bdz extended mnemonics on PPC64
Support BDNZ and BDZ mnemonics, they are commonly used
POWER instructions. The raw BC mnemonic is not easy
to read.

Likewise, cleanup code surrounding these changes.

Change-Id: I72f1dad5013f7856bd0dd320bfb17b5a9f3c69ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/390696
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
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2022-03-11 14:06:56 +00:00
Tobias Klauser
c1f22134f2 runtime/pprof, syscall: report MaxRSS on all unix platforms
All unix platforms currently supported by Go provide the getrusage
syscall. On aix and solaris the Getrusage syscall wrapper is not
available yet, so add and use it to report MaxRSS in memory profiles.

Change-Id: Ie880a3058171031fd2e12ccf9adfb85ce18858b1
Reviewed-on: https://go-review.googlesource.com/c/go/+/391434
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2022-03-11 06:03:26 +00:00
Robert Griesemer
fe75fe3c7a spec: various minor clarifications
- Allow for a type parameter as length/capacity to make.
- Be slightly more precise in prose for append.
- Add a couple of links.

Change-Id: Ib97e528bab1ab55d271beeeb53d9bb7a07047b9b
Reviewed-on: https://go-review.googlesource.com/c/go/+/391754
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2022-03-11 06:00:18 +00:00
Robert Griesemer
59d80227ef spec: clean up intro and replace bolded text with prose
- Remove "Draft" disclaimer. We're not done but the spec
  is in usable shape with respect to generics features.

- Remove section on "Earlier version" and fold information
  into the "Intro" section.

- Remove caveat for shifts: the rules for arithmetic operators
  on type parameters apply for them as well.

- Simply state that we don't support arguments of type parameter
  type for the built-ins real, imag, and complex.

Fixes #51182.

Change-Id: I6df1427de685cfe7055b64e91753aa7ebff70565
Reviewed-on: https://go-review.googlesource.com/c/go/+/391695
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2022-03-11 06:00:14 +00:00
Bryan C. Mills
751b8798dd cmd/compile/internal/amd64: fix "missing objdump" skip in TestGoAMD64v1
The skip was erroneously applied to errors from the call to StdoutPipe
instead of Start, and even then was a bit too broad.

Change-Id: I417c9a74692383230fc6d99ebb4149fdc532533e
Reviewed-on: https://go-review.googlesource.com/c/go/+/391800
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2022-03-11 05:22:30 +00:00