Daniel Martí [Fri, 19 Aug 2022 11:00:01 +0000 (12:00 +0100)]
go/printer: reduce allocations to improve performance
First, we know that Go source files almost always weigh at least a few
kilobytes, so we can kickstart the output buffer to be a reasonable size
and reduce the initial number of incremental allocations and copies when
appending bytes or strings to output.
Second, in nodeSize we use a nested printer, but we don't actually need
its printed bytes - we only need to know how many bytes it prints.
For that reason, use a throwaway buffer: the part of our output buffer
between length and capacity, as we haven't used it yet.
Third, use a sync.Pool to reuse allocated printers.
The current API doesn't allow reusing printers,
and some programs like gofmt will print many files in sequence.
Those changes combined result in a modest reduction in allocations and
CPU usage. The benchmark uses testdata/parser.go, which has just over
two thousand lines of code, which is pretty standard size-wise.
We also split the Print benchmark to cover both a medium-sized ast.File
as well as a pretty small ast.Decl node. The latter is a somewhat common
scenario in gopls, which has code actions which alter small bits of the
AST and print them back out to rewrite only a few lines in a file.
name old time/op new time/op delta
PrintFile-16 5.43ms ± 1% 4.85ms ± 3% -10.68% (p=0.000 n=9+10)
PrintDecl-16 19.1µs ± 0% 18.5µs ± 1% -3.04% (p=0.000 n=10+10)
name old speed new speed delta
PrintFile-16 9.56MB/s ± 1% 10.69MB/s ± 3% +11.81% (p=0.000 n=8+10)
PrintDecl-16 1.67MB/s ± 0% 1.73MB/s ± 1% +3.05% (p=0.000 n=10+10)
name old alloc/op new alloc/op delta
PrintFile-16 332kB ± 0% 107kB ± 2% -67.87% (p=0.000 n=10+10)
PrintDecl-16 3.92kB ± 0% 3.28kB ± 0% -16.38% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
PrintFile-16 3.45k ± 0% 2.42k ± 0% -29.90% (p=0.000 n=10+10)
PrintDecl-16 56.0 ± 0% 46.0 ± 0% -17.86% (p=0.000 n=10+10)
Change-Id: I475a3babca77532b2d51888f49710f74763d81d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/424924
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all: transfer reflect.{SliceHeader, StringHeader} to unsafeheader.{Slice, String}
After we deprecated reflect.{SliceHeader, StringHeader}, it is recommended
to use unsafe.{Slice, String} to replace its work. However, the compiler
and linker cannot be migrated for the time being.
As a temporary strategy, using the "internal/unsafeheader" package like
other code is the most suitable choice at present.
For #53003.
Change-Id: I69d0ef72e2d95caabd0706bbb247a719d225c758
Reviewed-on: https://go-review.googlesource.com/c/go/+/429755
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As discussed in CL 401434 there are substantial misuses of these in the
wild, and they are a potential source of unsafety even for code that
does not use them directly.
Since proposal #53003 has already been implemented, now is the right
time to deprecate reflect.{SliceHeader, StringHeader}.
For #53003.
Change-Id: I724cf46d4b22d2ed3cbf2b948e6aac5ee4bf0f6e
Reviewed-on: https://go-review.googlesource.com/c/go/+/428757
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cui fliter [Wed, 7 Sep 2022 08:04:36 +0000 (08:04 +0000)]
strconv: remove redundant type conversion
Change-Id: I25c8e8b701d6489f360fea30d09090826276b950
GitHub-Last-Rev: c2c8319dd5fa2a53fe82b10ecbf45eb54b5d6a68
GitHub-Pull-Request: golang/go#54924
Reviewed-on: https://go-review.googlesource.com/c/go/+/428976
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Kir Kolyshkin [Wed, 7 Sep 2022 01:09:11 +0000 (18:09 -0700)]
os: fix wrong error msg from TestDoubleCloseError
When the type assertion fails, the test mistakenly prints the expected
(rather than the actual) type.
When the error string doesn't match, the text mistakenly prints the
original (rather than the converted) error (although there might not be
any difference in the output, the code looks wrong).
Fix both issues.
Change-Id: Ia7dd0632fc677f458fec25d899c46268a12f76e7
Reviewed-on: https://go-review.googlesource.com/c/go/+/428916
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Joe Tsai [Tue, 23 Aug 2022 01:19:24 +0000 (18:19 -0700)]
time: optimize FixedZone by caching unnamed zones by the hour
FixedZone is transitively called by Time.UnmarshalJSON or Time.UnmarshalText
for any RFC 3339 timestamp that is not in UTC.
This function is relatively slow since it allocates 3 times.
Given that RFC 3339 never has a zone name and most offsets are by the hour,
we can cache unnamed zones on hour offsets.
Caching a Location should be safe since it has no exported fields or methods
that can mutate the Location. It is functionally immutable.
The only way to observe that the Location was cached is either
by pointer comparison or by shallow copying the struct value.
Neither operation seems sensible to do with a *time.Location.
Performance:
name old time/op new time/op delta
UnmarshalText 268ns ± 2% 182ns ± 1% -32.01% (p=0.000 n=10+10)
Change-Id: Iab5432f34bdbb485512bb8b5464e076c03fd106f
Reviewed-on: https://go-review.googlesource.com/c/go/+/425116
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all: use unsafe.{Slice, SliceData, String, StringData} to simplify code
Because most of these APIs are recently supported, we can only do some
advancement work as much as possible under the premise of compatibility.
For #54854.
Change-Id: Id15d11288bf23902570d54eaf2704a5264210b2e
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Robert Griesemer [Wed, 7 Sep 2022 21:32:22 +0000 (14:32 -0700)]
spec: describe slice-to-array conversions
For #46505.
Change-Id: I1a30fd895496befd16626afb48717ac837ed5778
Reviewed-on: https://go-review.googlesource.com/c/go/+/429315 Reviewed-by: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Robert Griesemer <gri@google.com>
Michael Anthony Knyszek [Wed, 7 Sep 2022 20:31:00 +0000 (20:31 +0000)]
runtime: use searchIdx in scavengeOne
This is an optimization that prevents N^2 behavior within a chunk, but
was accidentally skipped. There should be no functional change as a
result of this CL.
Fixes #54892.
Change-Id: I861967a2268699fdc3464bd41bc56618b5628e6b
Reviewed-on: https://go-review.googlesource.com/c/go/+/429255
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Michael Anthony Knyszek [Wed, 7 Sep 2022 20:14:46 +0000 (20:14 +0000)]
runtime: make mheap.pagesInUse an atomic.Uintptr
This change fixes an old TODO that made it a uint64 because it would
make alignment within mheap more complicated. Now that we don't have to
worry about it since we're using atomic types as much as possible,
switch to using a Uintptr. This likely will improve performance a tiny
bit on 32-bit platforms, but really it's mostly cleanup.
Change-Id: Ie705799a111ccad977fc1f43de8b50cf611be303
Reviewed-on: https://go-review.googlesource.com/c/go/+/429221 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com>
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Michael Anthony Knyszek [Wed, 7 Sep 2022 20:03:25 +0000 (20:03 +0000)]
runtime: remove atomic store requirement on pageAlloc.chunks
pageAlloc.chunks used to require an atomic store when growing the heap
because the scavenger would look at the list without locking the heap
lock. However, the scavenger doesn't do that anymore, and it looks like
nothing really does at all.
This change updates the comment and makes the store non-atomic.
Change-Id: Ib452d147861060f9f6e74e2d98ee111cf89ce8f5
Reviewed-on: https://go-review.googlesource.com/c/go/+/429219
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Michael Anthony Knyszek [Wed, 7 Sep 2022 19:58:34 +0000 (19:58 +0000)]
runtime: use atomic types in mspanset.go for alignment and type safety
Right now, span sets use a lot of unsafe.Pointer and naked atomics
operations. This change modifies it to use atomic types everywhere and
wraps any atomic.UnsafePointer in a type to improve type safety.
This change should functionally be a no-op.
Change-Id: I32e6c460faaf6ec41ab1163158f6da7938eef3de
Reviewed-on: https://go-review.googlesource.com/c/go/+/429218 Reviewed-by: Keith Randall <khr@golang.org>
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Lynn Boger [Tue, 30 Aug 2022 20:51:57 +0000 (15:51 -0500)]
cmd/compile/internal: merge rules in PPC64.rules
This uses rulegen syntax which allows similar rules
to be combined, saving lines in the rules file.
The Lsh16x32 rule had an incorrect value and that was
fixed.
Change-Id: I637410e39d8554825076aca5ac24083ce05ab186
Reviewed-on: https://go-review.googlesource.com/c/go/+/429035 Reviewed-by: Keith Randall <khr@google.com>
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Change-Id: I0407d96e2ba1376cc33fe91b52b6a8d7e81f59ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/428277
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Change-Id: I1c9f91e983fb26b3e46c65513a4f14508774e543
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Change-Id: I5780c3f26302fd5cf21e4a1f0bc1777abb658c82
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Change-Id: I761766e147202970f82ce804dbaf5d491508995c
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Change-Id: I56bd5d6b1333a96339340e5af5e6470cc7fb11a2
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Change-Id: Ifb51cb4ed98a93742ce4b221137a0ad73b939b06
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Change-Id: I427776e5b2d9c7279932548c86c8faded0eed041
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Change-Id: I2ec419f475f9c5d5ef1d4557cb5862a55a699d9c
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Change-Id: I4e05b892373713365f60258f64b3de94382ad983
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Change-Id: I644f696d00b5bce448e0a00835b3162f5203f346
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Change-Id: I559986b5408d3967c58c9abc6e8f4b04b25496a6
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Paul E. Murphy [Thu, 1 Sep 2022 14:23:49 +0000 (09:23 -0500)]
cmd/asm: improve argument to obj.Prog assignment on PPC64
These can be simplified with the knowledge of how arguments are
assigned to obj.Prog objects on PPC64. If the argument is not
a register type, the Reg argument (a2 in optab) of obj.Prog is
not used, and those arguments are placed into RestArgs (a3, a4, a5
in optab).
This relaxes the special case handling enforced by IsPPC64RLD and
IsPPC64ISEL. Instead, arguments are assigned as noted above, and
incorrect usage of such opcodes is checked by optab rules, not by
the assembler front-end.
Likewise, add support for handling 6 argument opcodes, these do
not exist today, but will be added with ISA 3.1 (Power10).
Finally, to maintain backwards compatibility, some 4-arg opcodes
whose middle arguments are a register and immediate, could swap
these arguments and generate identical machine code. This likely
wasn't intended, but is possible. These are explicitly fixed up
in the backend, and the asm tests are extended to check these.
Change-Id: I5f8190212427dfe8e6f062185bfefb5fa4fd0e75
Reviewed-on: https://go-review.googlesource.com/c/go/+/427516 Reviewed-by: Cherry Mui <cherryyz@google.com>
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cmd/compile: Add shiftIsBounded check for logic shifts of arm64
This CL adds shiftIsBounded checks for the Lsh* and Rsh* rules in arm64.
There is no need to check the shift value again with CMP + CSEL when the
shift value is valid.
Change-Id: I54620de64f02a1b5a11089add237248ae2de01b4
Reviewed-on: https://go-review.googlesource.com/c/go/+/417714 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Heschi Kreinick <heschi@google.com>
Matthew Dempsky [Wed, 7 Sep 2022 02:30:30 +0000 (19:30 -0700)]
cmd/compile/internal/noder: fix type switch case vars package
When naming case variables, the unified frontend was using
typecheck.Lookup, which uses the current package, rather than
localIdent, which uses the package the variable was originally
declared in. When inlining across package boundaries, this could cause
the case variables to be associated with the wrong package.
In practice, I don't believe this has any negative consequences, but
it's inconsistent and triggered an ICE in typecheck.ClosureType, which
expected all captured variables to be declared in the same package.
Easy fix is to ensure case variables are declared in the correct
package by using localIdent.
Matthew Dempsky [Wed, 7 Sep 2022 02:28:11 +0000 (19:28 -0700)]
test: add failing test case for inlined type switches
The unified frontend ICEs when inlining a function that contains a
function literal, which captures both a type switch case variable and
another variable.
Updates #54912.
Change-Id: I0e16d371ed5df48a70823beb0bf12110a5a17266
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Matthew Dempsky [Wed, 7 Sep 2022 09:04:13 +0000 (02:04 -0700)]
test: fix typo in escape_unsafe.go
The toStringData test was meant to test reflect.StringHeader, not
reflect.SliceHeader. It's not supported to convert *string to
*reflect.SliceHeader anyway.
Change-Id: Iaa4912eafd241886c6337bd7607cdf2412a15ead
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Joe Tsai [Wed, 24 Aug 2022 02:27:49 +0000 (19:27 -0700)]
reflect: fix stale Value.kind documentation
The lowests fives bits are the kind, and the next five bits are attributes,
not the other way around.
Change-Id: I5e1d13b195b766e99f66bb1227cc7f84e85dc49d
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Change-Id: I583e167dac033037e82e55a9ae6c6f0c47a34c7f
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Kir Kolyshkin [Wed, 7 Sep 2022 00:48:26 +0000 (17:48 -0700)]
os: fix wrong error msg from TestReadClosed
If test would fail, the error message will have wrong error and its
type, because e is used after the failed type assertion.
To fix, use the original err.
While at it,
- combine the checks for error type and value into one statement;
- use the standard "got ..., want ..." format.
Fixes: 212d2f82e050 ("os: add ErrClosed, return for use of closed File")
Change-Id: I862a96607b461ab89cce6bed2443b28aa2c16468
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Change-Id: Ie100a2a6f272b84fa2da6ac7b64452985242d788
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Change-Id: I2ed993a804dd830b9ff445c467eb224b7aaa3401
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Ian Lance Taylor [Wed, 7 Sep 2022 01:14:31 +0000 (01:14 +0000)]
Revert "sync: convert Once.done to atomic type"
This reverts commit CL 427140.
Reason for revert: Comments say that done should be the first field.
Change-Id: Id131da064146b44e1182289546aeb877867e63cc
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Change-Id: I0d1195fcb4eceb12c4be3190b05a82079dc496a3
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Joel Sing [Sat, 27 Aug 2022 20:11:43 +0000 (06:11 +1000)]
cmd/compile: remove redundant SEQZ/SNEZ on riscv64
In particular, (SEQZ (SNEZ x)) can arise from (Not (IsNonNil x)).
Change-Id: Ie249cd1934d71087e0f774cf8f6c937ceeed7ad5
Reviewed-on: https://go-review.googlesource.com/c/go/+/428215
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Joel Sing [Mon, 29 Aug 2022 20:32:09 +0000 (06:32 +1000)]
cmd/compile: avoid zero extension after properly typed atomic operation on riscv64
LoweredAtomicLoad8 is implemented using MOVBU, hence it is already zero
extended. LoweredAtomicCas32 and LoweredAtomicCas64 return a properly
typed boolean.
Change-Id: Ie0acbaa19403d59c7e5f76d060cc13ee51eb7834
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Joel Sing [Mon, 29 Aug 2022 10:36:51 +0000 (20:36 +1000)]
cmd/compile: improve Slicemask on riscv64
Implement Slicemask the same way every other architecture does - negate
then arithmetic right shift. This sets or clears the sign bit, before
extending it to the entire register.
Removes around 2,500 instructions from the Go binary on linux/riscv64.
Change-Id: I4d675b826e7eb23fe2b1e6e46b95dcd49ab49733
Reviewed-on: https://go-review.googlesource.com/c/go/+/426354 Reviewed-by: Meng Zhuo <mzh@golangcn.org> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com>
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runtime: simplify code using unsafe.{Slice,String}
Updates #54854
Change-Id: Ie18665e93e477b6f220acf4c6c070b2af4343064
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Andy Pan [Tue, 6 Sep 2022 17:16:14 +0000 (01:16 +0800)]
net: fix a typo in BenchmarkSendFile
Change-Id: Ic463bd6d52e7d1d50d2dbd2122b4d514e0b4af60
Reviewed-on: https://go-review.googlesource.com/c/go/+/428755 Reviewed-by: Ian Lance Taylor <iant@google.com>
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Kir Kolyshkin [Tue, 28 Jun 2022 22:40:29 +0000 (15:40 -0700)]
os/exec: LookPath: use eaccess for exec check on linux
Having an executable bit set for a binary is not enough for it to be
executable -- there might be more checks in the kernel. For example,
binaries on a filesystem mounted with "noexec" flag couldn't be
executed. There might be other scenarios involving ACLs, SELinux,
file capabilities, and so on.
As a result, LookPath might either find a non-executable (while going
over $PATH elements), or return a false positive that the argument
provided is an executable.
One possible fix would be to perform the check by using access(2)
syscall with X_OK flag.
Now, since access(2) uses real (rather than effective) uid and gid,
when used by a setuid or setgid binary, it checks permissions of the
(real) user who started the binary, rather than the actual effective
permissions. Therefore, using access with X_OK won't work as expected
for setuid/setgid binaries.
To fix this, modern platforms added ways to check against effective uid
and gid, with the most common being the faccessat(2) call with the
AT_EACCESS flag, as described by POSIX.1-2008 (in Linux, only
faccessat2(2) supports flags such as AT_EACCESS). Let's use it, and fall
back to checking permission bits if faccessat is not available.
Wrap the logic into unix.Eaccess, which is currently only implemented on
Linux. While many other OSes (Free/Net/OpenBSD, AIX, Solaris/Illumos, and
Darwin) do implement faccessat(2) with AT_EACCESS, it is not wired in
syscall package (except for AIX), so these platforms are left out for now.
In the future, eaccess can be implemented for these OSes, too.
Alas, a call to unix.Eaccess is not enough since we have to filter out
directories, so use both stat and Eaccess.
One minor change introduced by this commit is that LookPath and Command
now returns "is a directory" error when the argument contains a slash
and is a directory. This is similar to what e.g. bash does on Linux:
$ bash -c /etc
bash: line 1: /etc: Is a directory
Add a test case, which, unfortunately, requires root, is specific to
Linux, and needs a relatively new kernel (supporting faccessat2). Other
platforms either have different semantics for tmpfs with noexec, or have
different ways to set up a binary which has x bit set but nevertheless
could not be executed.
Change-Id: If49b6ef6bf4dd23b2c32bebec8832d83e511a4bb
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Michael Pratt [Fri, 2 Sep 2022 20:50:41 +0000 (16:50 -0400)]
cmd/link,runtime: remove unused fields from inlinedCall
The parent, file, and line fields are no longer used now that we have
parentPc to find the parent and NOPs in the parent to attach file/line
pcdata to.
Removing these fields reduces the binary size of cmd/go on linux-amd64
by 1.1%.
Fixes #54849.
Change-Id: If58f08622736b2b322288608776f8bedf0c3fd17
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For defer/go calls, the function/method value are evaluated immediately.
So after devirtualizing, it may trigger a panic when implicitly deref
a nil pointer receiver, causing the program behaves unexpectedly.
It's safer to not devirtualizing defer/go calls at all.
Fixes #52072
Change-Id: I562c2860e3e577b36387dc0a12ae5077bc0766bf
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