Ref: The RISC-V Instruction Set Manual Volume I: Unprivileged ISA
11.6 Single-Precision Floating-Point Computational Instructions
Change-Id: I89aa3a4df7576fdd47f4a6ee608ac16feafd093c
Reviewed-on: https://go-review.googlesource.com/c/go/+/506036 Reviewed-by: Joel Sing <joel@sing.id.au>
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Joel Sing [Sat, 11 Mar 2023 15:15:43 +0000 (02:15 +1100)]
syscall: add support for openbsd/ppc64
Add syscall support for the openbsd/ppc64 port.
Updates #56001
Change-Id: I695c5c296e90645515de0c8f89f1bc57e976679d
Reviewed-on: https://go-review.googlesource.com/c/go/+/475636 Reviewed-by: Eric Grosse <grosse@gmail.com> Reviewed-by: Cherry Mui <cherryyz@google.com>
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Joel Sing [Sat, 18 Mar 2023 08:51:52 +0000 (19:51 +1100)]
runtime: rework asmcgocall on ppc64x
On some platforms asmcgocall can be called with a nil g. Additionally, it
can be called when already on a the system (g0) stack or on a signal stack.
In these cases we do not need to switch (and/or cannot switch) to the
system stack and as a result, do not need to save the g.
Rework asmcgocall on ppc64x to follow the pattern used on other architectures,
such as amd64 and arm64, where a separate nosave path is called in the above
cases. The nil g case will be needed to support openbsd/ppc64.
Updates #56001
Change-Id: I431d4200bcbc4aaddeb617aefe18590165ff2927
Reviewed-on: https://go-review.googlesource.com/c/go/+/478775 Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com> Reviewed-by: Paul Murphy <murp@ibm.com>
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Matthew Dempsky [Sun, 20 Aug 2023 17:05:29 +0000 (10:05 -0700)]
cmd/compile/internal/types: overhaul and simplify API
This CL removes a lot of the redundant methods for accessing struct
fields and signature parameters. In particular, users never have to
write ".Slice()" or ".FieldSlice()" anymore; the exported APIs just do
what you want.
Further internal refactorings to follow.
Change-Id: I45212f6772fe16aad39d0e68b82d71b0796e5639
Reviewed-on: https://go-review.googlesource.com/c/go/+/521295
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Rather than constructing a new runtime._defer struct type at each
defer statement, we can use a single shared one. Also, by naming it
runtime._defer, we avoid emitting new runtime and DWARF type
descriptors in every package that contains a "defer" statement.
Shaves ~1kB off cmd/go.
Change-Id: I0bd819aec9f856546e684abf620e339a7555e73f
Reviewed-on: https://go-review.googlesource.com/c/go/+/521676 Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
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Matthew Dempsky [Fri, 18 Aug 2023 22:52:34 +0000 (15:52 -0700)]
spec: clarify that []byte("") must be non-nil
The example text below suggests that []byte("") always evaluates to
the non-nil value []byte{}, but the text proper doesn't explicitly
require that. This CL makes it clear that it must not evaluate to
[]byte(nil), which otherwise was allowed by the wording.
Change-Id: I6564bfd5e2fd0c820d9b55d17406221ff93ce80c
Reviewed-on: https://go-review.googlesource.com/c/go/+/521035 Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
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Jes Cok [Sat, 19 Aug 2023 00:21:00 +0000 (00:21 +0000)]
os/exec: don't convert byte slice to string when using verb %s
Change-Id: I4d755e401acf670fb5a154ff59e4e4335ed2138e
GitHub-Last-Rev: a91d74ae55f84a0e572d2ace335ec42038d7a76f
GitHub-Pull-Request: golang/go#62150
Reviewed-on: https://go-review.googlesource.com/c/go/+/520918
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The go resolver shouldn't attempt to query .onion domains, but
the restriction was not restricted for search domains.
Also before this change query for "sth.onion" would
not be suffixed with any search domain (for "go.dev" search
domain, it should query fine the "std.onion.go.dev" domain).
Change-Id: I0f3e1387e0d59721381695f94586e3743603c30e
GitHub-Last-Rev: 7e8ec44078529353c18c8fe34e5207014ce1e685
GitHub-Pull-Request: golang/go#60678
Reviewed-on: https://go-review.googlesource.com/c/go/+/501701
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Matthew Dempsky [Sun, 20 Aug 2023 17:23:03 +0000 (10:23 -0700)]
cmd/compile/internal/compare: simplify unit test framework
This CL refactors the compare unit tests to be simpler and to stop
using the types API in non-idiomatic ways, to facilitate further
refactoring of the API.
Change-Id: I864a66b2842a0d8dd45f4e3d773144d71666caf2
Reviewed-on: https://go-review.googlesource.com/c/go/+/521275
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Matthew Dempsky [Sun, 20 Aug 2023 06:04:46 +0000 (23:04 -0700)]
cmd/compile/internal/abi: stop using types.Func
This is supposed to be an internal type within package types. At least
for now, users of the types package should stick to the types.Type
APIs as much as possible.
This CL also unexports FuncType and a few others to prevent
backsliding.
Change-Id: I053fc115a5e6a57c148c8149851a45114756072f
Reviewed-on: https://go-review.googlesource.com/c/go/+/521255
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Austin Clements [Tue, 1 Aug 2023 18:41:42 +0000 (14:41 -0400)]
runtime: drop stack-allocated pcvalueCaches
Now that pcvalue keeps its cache on the M, we can drop all of the
stack-allocated pcvalueCaches and stop carefully passing them around
between lots of operations. This significantly simplifies a fair
amount of code and makes several structures smaller.
This series of changes has no statistically significant effect on any
runtime Stack benchmarks.
I also experimented with making the cache larger, now that the impact
is limited to the M struct, but wasn't able to measure any
improvements.
Austin Clements [Tue, 1 Aug 2023 17:54:32 +0000 (13:54 -0400)]
runtime: move pcvalue cache to M
Currently, the pcvalue cache is stack allocated for each operation
that needs to look up a lot of pcvalues. It's not always clear where
to put it, a lot of the time we just pass a nil cache, it doesn't get
reused across operations, and we put a surprising amount of effort
into threading these caches around.
This CL moves it to the M, where it can be long-lived and used by all
pcvalue lookups, and we don't have to carefully thread it across
operations.
This is a re-roll of CL 515276 with a fix for reentrant use of the
pcvalue cache from the signal handler.
Keith Randall [Fri, 18 Aug 2023 19:38:32 +0000 (12:38 -0700)]
cmd/compile: ensure we keep top 32 bits zeroed for 32-bit arm64 ops
When rewriting, for example, MSUBW, we need to ensure that the result
has its 32 top bits zeroed. That's what the instruction is spec'd to do.
Normally, we'd only use MSUBW for computations on 32-bit values, and
as such the top 32 bits aren't normally used. But some situations, like
if we cast the result to a uint64, the top 32 bits do matter.
This comes up in 62131 because we have a rule saying, MOVWUreg applied
to a MSUBW is unnecessary, as the arg to MOVWUreg already has zeroed
top 32 bits. But if MSUBW is later rewritten to another op that doesn't
zero the top 32 bits (SUB, probably), getting rid of the MOVWUreg earlier
causes a problem.
So change rewrite rules to always maintain the top 32 bits as zero if the
instruction is spec'd to provide that. We need to introduce a few *W operations
to make that happen.
Fixes #62131
Change-Id: If3d160821e285fd7454746b735a243671bff8894
Reviewed-on: https://go-review.googlesource.com/c/go/+/520916
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Bryan C. Mills [Mon, 21 Aug 2023 16:55:43 +0000 (12:55 -0400)]
context: fix synchronization in ExampleAfterFunc_cond
Condition variables are subtle and error-prone, and this example
demonstrates exactly the sorts of problems that they introduce.
Unfortunately, we're stuck with them for the foreseeable future.
As previously implemented, this example was racy: since the callback
passed to context.AfterFunc did not lock the mutex before calling
Broadcast, it was possible for the Broadcast to occur before the
goroutine was parked in the call to Wait, causing in a missed wakeup
resulting in deadlock.
The example also had a more insidious problem: it was not safe for
multiple goroutines to call waitOnCond concurrently, but the whole
point of using a sync.Cond is generally to synchronize concurrent
goroutines. waitOnCond must use Broadcast to ensure that it wakes up
the target goroutine, but the use of Broadcast in this way would
produce spurious wakeups for all of the other goroutines waiting on
the same condition variable. Since waitOnCond did not recheck the
condition in a loop, those spurious wakeups would cause waitOnCond
to spuriously return even if its own ctx was not yet done.
Fixing the aforementioned bugs exposes a final problem, inherent to
the use of condition variables in this way. This one is a performance
problem: for N concurrent calls to waitOnCond, the resulting CPU cost
is at least O(N²). This problem cannot be addressed without either
reintroducing one of the above bugs or abandoning sync.Cond in the
example entirely. Given that this example was already published in Go
1.21, I worry that Go users may think that it is appropriate to use a
sync.Cond in conjunction with context.AfterFunc, so I have chosen to
retain the Cond-based example and document its pitfalls instead of
removing or replacing it entirely.
I described this class of bugs and performance issues — and suggested
some channel-based alternatives — in my GopherCon 2018 talk,
“Rethinking Classical Concurrency Patterns”. The section on condition
variables starts on slide 37. (https://youtu.be/5zXAHh5tJqQ?t=679)
Bryan C. Mills [Fri, 18 Aug 2023 19:38:44 +0000 (15:38 -0400)]
cmd/go: find GOROOT using os.Executable when installed to GOROOT/bin/GOOS_GOARCH
When running make.bash in a cross-compiled configuration
(for example, GOARCH different from GOHOSTARCH), cmd/go
is installed to GOROOT/bin/GOOS_GOARCH instead of GOROOT/bin.
That means that we need to look for GOROOT in both ../.. and ../../..,
not just the former.
cmd/compile: move racewalk comment to walk/race.go
This comment got left behind in some refactoring and now refers to
code "below" that is no longer below. Move it to be with the code it's
referring to.
Andy Pan [Thu, 10 Aug 2023 06:02:03 +0000 (14:02 +0800)]
runtime: document maxStack and m.createstack in more details
Change-Id: If93b6cfa5a598a5f4101c879a0cd88a194e4a6aa
Reviewed-on: https://go-review.googlesource.com/c/go/+/518116 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>
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This CL refactors common patterns for constructing field and method
selector expressions. Notably, XDotField and XDotMethod are now the
only two functions where a SelecterExpr with OXDOT is constructed.
Change-Id: I4c087225d8b295c4a6a92281ffcbcabafe2dc94d
Reviewed-on: https://go-review.googlesource.com/c/go/+/520979
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
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Matthew Dempsky [Sat, 19 Aug 2023 00:43:15 +0000 (17:43 -0700)]
cmd/compile/internal/typecheck: refactor and simplify DeclFunc
This CL refactors typecheck.DeclFunc to require the caller to have
already constructed the ir.Func and signature type using ir.NewFunc
and types.NewSignature, and simplifies typecheck.DeclFunc to simply
return the slices of param and results ONAMEs.
typecheck.DeclFunc was the last reason that ir.Field still exists, so
this CL also gets rid of that.
Change-Id: Ib398420bac2fd135a235810b8af1635fa754965c
Reviewed-on: https://go-review.googlesource.com/c/go/+/520977
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Mateusz Poliwczak [Sat, 19 Aug 2023 07:52:34 +0000 (07:52 +0000)]
net: return "cannot unmarshal" error while parsing DNS messages
Change-Id: I407f5d3d3a3e8b3d43ff154f731d885e831971e9
GitHub-Last-Rev: d6a400d1ba6a09e726c9b4e4774a7e8a611611e8
GitHub-Pull-Request: golang/go#62155
Reviewed-on: https://go-review.googlesource.com/c/go/+/520980
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CL 521036 was prepared and tested before the revert CL 521155,
and it so happens that the reflectdata import ended up unused.
Drop it to fix the build.
Change-Id: I230c8fee616fc58cc82f3e5da886bcee2e02a3d3
Reviewed-on: https://go-review.googlesource.com/c/go/+/521175
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Joe Tsai [Tue, 14 Mar 2023 22:35:36 +0000 (15:35 -0700)]
expvar: emit valid JSON strings
Map.String and expvarHandler used the %q flag with fmt.Fprintf
to escape Go strings, which does so according to the Go grammar,
which is not always compatible with JSON strings.
Rather than calling json.Marshal for every string,
which will always allocate, declare a local appendJSONQuote
function that does basic string escaping.
Also, we declare an unexported appendJSON method on every
concrete Var type so that the final JSON output can be
constructed with far fewer allocations.
The resulting logic is both more correct and also much faster.
This does not alter the whitespace style of Map.String or expvarHandler,
but may alter the representation of JSON strings.
Performance:
name old time/op new time/op delta
MapString 5.10µs ± 1% 1.56µs ± 1% -69.33% (p=0.000 n=10+9)
name old alloc/op new alloc/op delta
MapString 1.21kB ± 0% 0.66kB ± 0% -45.12% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
MapString 37.0 ± 0% 7.0 ± 0% -81.08% (p=0.000 n=10+10)
Fixes #59040
Change-Id: I46a2125f43550b91d52019e5edc003d9dd19590f
Reviewed-on: https://go-review.googlesource.com/c/go/+/476336 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
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Ian Lance Taylor [Fri, 18 Aug 2023 23:34:29 +0000 (16:34 -0700)]
encoding/csv: correct Column docs
For #44221
Fixes #62147
Change-Id: Ibcc0d11c8253f51a8f5771791ea4173a38a61950
Reviewed-on: https://go-review.googlesource.com/c/go/+/520917
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Andy Pan [Fri, 18 Aug 2023 05:39:57 +0000 (13:39 +0800)]
encoding/gob: prevent panic from index out of range in Decoder.typeString
I believe this bug is introduced by CL 460543 which optimizes the allocations
by changing the type of `idToType` from map to slice, but didn't update the
access code in `Decoder.typeString` that is safe for map but not for slice.
Fixes #62117
Change-Id: I0f2e4cc2f34c54dada1f83458ba512a6fde6dcbe
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The only remaining use for typecheck.NeedRuntimeType is to make sure
that method expressions with anonymous receiver types (e.g.,
"struct{T}.M") have the promoted-method wrapper generated. But the
unified frontend takes care of arranging for this now.
Change-Id: I89340cb6a81343f35e0de1062610cbb993d3b6bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/521036
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Joe Tsai [Thu, 17 Aug 2023 04:27:15 +0000 (21:27 -0700)]
encoding: optimize growth behavior in Encoding.AppendDecode
The Encoding.DecodedLen API only returns the maximum length of the
expected decoded output, since it does not know about padding.
Since we have the input, we can do better by computing the
input length without padding, and then perform the DecodedLen
calculation as if there were no padding.
This avoids over-growing the destination slice if possible.
Over-growth is still possible since the input may contain
ignore characters like newlines and carriage returns,
but those a rarely encountered in practice.
Change-Id: I38b8f91de1f4fbd3a7128c491a25098bd385cf74
Reviewed-on: https://go-review.googlesource.com/c/go/+/520267
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Joe Tsai [Fri, 18 Aug 2023 01:13:01 +0000 (18:13 -0700)]
time: make Duration.String inlineable
Perform the [32]byte to string conversion in an inlinable method.
Thus, if the result does not escape in the context of the caller,
we can entirely avoid a call to runtime.slicebytetostring.
Change-Id: Iae8ec2a532776ed6cf99597f19e3f7f21c694c3a
Reviewed-on: https://go-review.googlesource.com/c/go/+/520602
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j178 [Fri, 18 Aug 2023 04:04:35 +0000 (12:04 +0800)]
errors: optimize Is and As by reusing reflection of target
goos: darwin
goarch: amd64
pkg: errors
cpu: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
│ old │ new │
│ sec/op │ sec/op vs base │
Is-12 133.4n ± 0% 126.8n ± 3% -4.91% (p=0.001 n=10)
As-12 464.1n ± 1% 307.2n ± 0% -33.80% (p=0.000 n=10)
geomean 248.8n 197.4n -20.66%
│ old │ new │
│ B/op │ B/op vs base │
Is-12 24.00 ± 0% 24.00 ± 0% ~ (p=1.000 n=10) ¹
As-12 40.00 ± 0% 40.00 ± 0% ~ (p=1.000 n=10) ¹
geomean 30.98 30.98 +0.00%
¹ all samples are equal
│ old │ new │
│ allocs/op │ allocs/op vs base │
Is-12 1.000 ± 0% 1.000 ± 0% ~ (p=1.000 n=10) ¹
As-12 2.000 ± 0% 2.000 ± 0% ~ (p=1.000 n=10) ¹
geomean 1.414 1.414 +0.00%
¹ all samples are equal
Change-Id: I0844f3ab77e63b5f773594157dcffaffffd5e70d
Reviewed-on: https://go-review.googlesource.com/c/go/+/520756
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Matthew Dempsky [Fri, 18 Aug 2023 07:32:11 +0000 (00:32 -0700)]
cmd/compile/internal/gc: steps towards work-queue
This CL reorganizes the top-level functions for handling package-level
declarations, runtime type descriptors, and SSA compilation to work in
a loop. This generalizes the loop that previously existed in dumpdata.
Change-Id: I0e51e60f6ef9e7f96a4a3ccd5801f7baf83eba9a
Reviewed-on: https://go-review.googlesource.com/c/go/+/520611
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Matthew Dempsky [Fri, 18 Aug 2023 07:09:06 +0000 (00:09 -0700)]
cmd/compile/internal/ir: remove AsNode
Except for a single call site in escape analysis, every use of
ir.AsNode involves a types.Object that's known to contain
an *ir.Name. Asserting directly to that type makes the code simpler
and more efficient.
The one use in escape analysis is extended to handle nil correctly
without it.
Change-Id: I694ae516903e541341d82c2f65a9155e4b0a9809
Reviewed-on: https://go-review.googlesource.com/c/go/+/520775
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Matthew Dempsky [Fri, 18 Aug 2023 06:23:40 +0000 (23:23 -0700)]
cmd/compile/internal/ir: remove Ntype
This type used to provide extra type safety around which syntactic
nodes could also represent types, but now the only remaining use is
ir.TypeNode, and it always ends up as an ir.Node anyway. So we might
as well use Node instead.
Change-Id: Ia0842864794365b0e155dc5af154c673ffa2967b
Reviewed-on: https://go-review.googlesource.com/c/go/+/520609
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Matthew Dempsky [Fri, 18 Aug 2023 06:04:08 +0000 (23:04 -0700)]
cmd/compile/internal/ir: remove OFUNCINST and InstExpr
These were only ever used by the pre-unified generics frontend. I
initially kept them because I thought they'd be useful for the unified
frontend eventually too, but that hasn't manifested.
Change-Id: Iaa31a76ac4d62533ec269d2a7141442b8e344180
Reviewed-on: https://go-review.googlesource.com/c/go/+/520608
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Andy Pan [Fri, 18 Aug 2023 03:54:48 +0000 (11:54 +0800)]
encoding/json: use base64.Encoding.AppendEncode
For #53693
Change-Id: I6a428a4a10a2e2efa03296f539e190f0743c1f46
Reviewed-on: https://go-review.googlesource.com/c/go/+/520755 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Joseph Tsai <joetsai@digital-static.net> Reviewed-by: Ian Lance Taylor <iant@google.com>
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Ian Lance Taylor [Fri, 18 Aug 2023 16:44:16 +0000 (09:44 -0700)]
spec: correct type parameter name used in example
Change-Id: I40595a3f598483d029473af465c756f8777ecc91
Reviewed-on: https://go-review.googlesource.com/c/go/+/520915 Reviewed-by: Ian Lance Taylor <iant@google.com>
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Chris O'Hara [Wed, 16 Aug 2023 01:14:53 +0000 (11:14 +1000)]
runtime/internal/wasitest: skip racy TCP echo test
The wasip1 TCP echo test introduced in CL 493358 has a race
condition with port selection. The test runner probes for a free
port and then asks the WASM runtime to listen on the port, which
may be taken by another process in the interim.
Due to limitations with WASI preview 1, the guest is unable to
query the port it's listening on. The test cannot ask the WASM
runtime to listen on port 0 (choose a free port) since there's
currently no way for the test to query the selected port and
connect to it.
Given the race condition is unavoidable, this test is now disabled
by default and requires opt-in via an environment variable.
This commit also eliminates the hard-coded connection timeout.
Fixes #61820.
Change-Id: I375145c1a1d03ad45c44f528da3347397e6dcb01
Reviewed-on: https://go-review.googlesource.com/c/go/+/519895
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Michael Anthony Knyszek [Thu, 17 Aug 2023 18:36:00 +0000 (18:36 +0000)]
runtime/pprof: increase contention upper bound in TestMutexProfile
Currently TestMutexProfile expects contention to reported as somewhere
between 0.9x and 2.0x the expected amount introduced. While bounding
from below is fine (especially since the goroutine holding the mutex
doesn't even start to sleep until the required number of goroutines are
blocked on a mutex), bounding from above can easily lead to flakiness.
Delays and non-determinism can come from anywhere in the system,
and nevertheless clocks keep ticking. The result is that goroutines
could easily appear to be blocked on a mutex much longer than just the
sleep time.
However, the contention upper bound is still useful, especially for
identifying wildly incorrect values. Set the contention total to be
proportional to the total wall-time spent in the actual sampling mutex
block sampling portion of the code. This should be a generous
upper-bound on how much contention there could be, because it should in
theory capture any delays from the environment in it as well.
Still, rounding errors could be an issue, and on Windows the time
granularity is quite low (~15ms, or 15% of what each goroutine is
supposed to add to the mutex profile), so getting unlucky with where
time measurements fall within each tick could also be a problem. Add an
extra 10%, which seems to make it much less likely to fail in a Windows
gomote.
Fixes #62094.
Change-Id: I59a10a73affd077185dada8474b91d0bc43b4a43
Reviewed-on: https://go-review.googlesource.com/c/go/+/520635
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Cherry Mui [Fri, 18 Aug 2023 15:10:23 +0000 (11:10 -0400)]
cmd/link: don't mangle string symbol names
String symbol names could contain weird characters as we put the
string literal into the symbol name. So it may appear to need
mangling. However, as string symbols are grouped into a single
"go:string.*" symbol, the individual symbol names actually don't
matter. So don't mangle them.
Also make the mangling code more defensive in case of weird
symbol names.
Fixes #62098.
Change-Id: I533012567a9fffab69debda934f426421c7abb04
Reviewed-on: https://go-review.googlesource.com/c/go/+/520856 Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
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This CL implements the remainder of the zero-copy string->[]byte
conversion optimization initially attempted in go.dev/cl/520395, but
fixes the tracking of mutations due to ODEREF/ODOTPTR assignments, and
adds more comprehensive tests that I should have included originally.
However, this CL also keeps it behind the -d=zerocopy flag. The next
CL will enable it by default (for easier rollback).
Updates #2205.
Change-Id: Ic330260099ead27fc00e2680a59c6ff23cb63c2b
Reviewed-on: https://go-review.googlesource.com/c/go/+/520599
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Joe Tsai [Thu, 22 Jun 2023 18:44:55 +0000 (11:44 -0700)]
encoding: require unique alphabet for base32 and base64
In order for decoding to faithfully reproduce the encoded input,
the symbols must be unique (i.e., provide a bijective mapping).
Thus, reject duplicate symbols in NewEncoding.
As a minor optimization, modify WithPadding to use the decodeMap
to quickly check whether the padding character is used in O(1)
instead of O(32) or O(64).
Change-Id: I5631f6ff9335c35d59d020dc0e307e3520786fbc
Reviewed-on: https://go-review.googlesource.com/c/go/+/520335 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Robert Griesemer [Mon, 14 Aug 2023 21:21:53 +0000 (14:21 -0700)]
spec: fix unification rule for inexact interface unification
Irrespective of whether unification is exact or inexact, method
signatures of interfaces must always match exactly: a type never
satisfies/implements an interface if relevant method signatures
are different (i.e., not identical, possibly after substitution).
This change matches the fix https://go.dev/cl/519435.
For #61879.
Change-Id: I28b0a32d32626d85afd32e107efce141235a923d
Reviewed-on: https://go-review.googlesource.com/c/go/+/519455
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Ian Lance Taylor [Thu, 17 Aug 2023 20:03:21 +0000 (13:03 -0700)]
cmd/internal/buildid: don't crash on 0 phdr.p_align field
A 0 in phdr.p_align is the same as 1, meaning no alignment.
Fixes #62097
Change-Id: I931bab443fd6a89b5b45c8f99ead217f02e9b453
Reviewed-on: https://go-review.googlesource.com/c/go/+/520597
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This CL enables the latent support for string->[]byte conversions
added go.dev/cl/520259.
One catch is that we need to make sure []byte("") evaluates to a
non-nil slice, even if "" is (nil, 0). This CL addresses that by
adding a "ptr != nil" check for OSTR2BYTESTMP, unless the NonNil flag
is set.
The existing uses of OSTR2BYTESTMP (which aren't concerned about
[]byte("") evaluating to nil) are updated to set this flag.
Fixes #2205.
Change-Id: I35a9cb16c164cd86156b7560915aba5108d8b523
Reviewed-on: https://go-review.googlesource.com/c/go/+/520395
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This CL removes the extra complexity from escape analysis that was
only needed to support go/defer normalization. It does not affect
analysis results at all.
Change-Id: I75785e0cb4c4ce19bea3b8df0bf95821bd885291
Reviewed-on: https://go-review.googlesource.com/c/go/+/520261
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Normalizing go/defer statements to always use functions with zero
parameters and zero results was added to escape analysis, because that
was the earliest point at which all three frontends converged. Now
that we only have the unified frontend, we can do it during typecheck,
which is where we perform all other desugaring and normalization
rewrites.
Change-Id: Iebf7679b117fd78b1dffee2974bbf85ebc923b23
Reviewed-on: https://go-review.googlesource.com/c/go/+/520260 Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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I previously used a clumsy hack to copy Closgen back and forth while
inlining, to handle when an inlined function contains closures, which
need to each be uniquely numbered.
The real solution was to name the closures using r.inlCaller, rather
than r.curfn. This CL adds a helper method to do exactly this.
Change-Id: I510553b5d7a8f6581ea1d21604e834fd6338cb06
Reviewed-on: https://go-review.googlesource.com/c/go/+/520339
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Matthew Dempsky [Thu, 17 Aug 2023 02:45:12 +0000 (19:45 -0700)]
cmd/compile: cleanup Func construction
This CL moves more common Func-setup logic into ir.NewFunc. In
particular, it now handles constructing the Name and wiring them
together, setting the Typecheck bit, and setting Sym.Func.
Relatedly, this CL also extends typecheck.DeclFunc to append the
function to typecheck.Target.Funcs, so that callers no longer need to
do this.
Change-Id: Ifa0aded8df0517188eb295d0dccc107af85f1e8a
Reviewed-on: https://go-review.googlesource.com/c/go/+/520338
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This CL extends ir.NewClosureFunc to take the signature type argument,
and to handle naming the closure and adding it to typecheck.Target.
It also removes the code for typechecking OCLOSURE and ODCLFUNC nodes,
by having them always constructed as typechecked. ODCLFUNC node
construction will be further simplified in the followup CL.
Change-Id: Iabde4557d33051ee470a3bc4fd49599490024cba
Reviewed-on: https://go-review.googlesource.com/c/go/+/520337
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Joe Tsai [Thu, 23 Mar 2023 08:01:46 +0000 (01:01 -0700)]
log/slog: simplify and optimize RFC3339 handling
In CL 421877 and CL 444278, time.Time.AppendFormat has been
specially optimized for the time.RFC3339Nano representation.
Relying on that optimization and modify the output to obtain the
fixed-width millisecond resolution that slog uses.
This both removes a lot of code and also improves performance:
name old time/op new time/op delta
WriteTime 93.0ns ± 1% 80.8ns ± 0% -13.17% (p=0.000 n=8+9)
Change-Id: I61e8f4476c111443e3e2098a45b2c21a76137345
Reviewed-on: https://go-review.googlesource.com/c/go/+/478757 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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chanxuehong [Thu, 17 Aug 2023 01:58:22 +0000 (01:58 +0000)]
math/big, math/rand: use the built-in max function
Change-Id: I71a38dd20bfaf2b1aed18892d54eeb017d3d7d66
GitHub-Last-Rev: 8da43b2cbd563ed123690709e519c9f84272b332
GitHub-Pull-Request: golang/go#61955
Reviewed-on: https://go-review.googlesource.com/c/go/+/518595
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First, we already optimize directly called closures. For example,
given:
var x int // already stack allocated today
p := func() *int { return &x }()
we don't need to move x to the heap, because we can statically track
where &x flows. This CL extends the same idea to work for indirectly
called closures too, as long as we know everywhere that they're
called. For example:
var x int // stack allocated after this CL
f := func() *int { return &x }
p := f()
This will allow a subsequent CL to move the generation of go/defer
wrappers earlier.
Second, this CL adds tracking to detect when pointer values flow to
the pointee operand of an indirect assignment statement (i.e., flows
to p in "*p = x") or to builtins that modify memory (append, copy,
clear). This isn't utilized in the current CL, but a subsequent CL
will make use of it to better optimize string->[]byte conversions.
Updates #2205.
Change-Id: I610f9c531e135129c947684833e288ce64406f35
Reviewed-on: https://go-review.googlesource.com/c/go/+/520259
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Jes Cok [Wed, 16 Aug 2023 10:53:49 +0000 (10:53 +0000)]
fmt: amend comment for getField
Change-Id: I52c9ed0c1a178f3ae3eb4f135d8f11018075fe3b
GitHub-Last-Rev: 407aa89c88fc7bb3e4ad9ef55c2a0c5c2f92642c
GitHub-Pull-Request: golang/go#62061
Reviewed-on: https://go-review.googlesource.com/c/go/+/519935
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Joe Tsai [Thu, 22 Jun 2023 18:03:17 +0000 (11:03 -0700)]
encoding: reject negative runes in Encoding.WithPadding
A negative rune (other than NoPadding) makes no semantic sense.
Doing so relies on integer overflow of converting a rune to a byte
and would thus be equivalent to passing the positive byte value
of byte(padding).
This may cause existing code to panic.
An alternative is treat negative runes as equivalent to NoPadding.
However, the code already panics to report erroneous padding values,
so this is in line with the existing API.
Change-Id: I02499705519581598adc0c8525d90e25278dc056
Reviewed-on: https://go-review.googlesource.com/c/go/+/505236
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Joe Tsai [Sun, 5 Mar 2023 03:53:14 +0000 (19:53 -0800)]
io: reduce allocations in Pipe constructor
Rather than having PipeWriter and PipeReader a wrapper type on pipe,
make them have the same underlying memory representation and
rely instead of simply casting the same *pipe pointer
as either a *PipeReader or *PipeWriter to control the set of methods.
This reduces the number of allocations by 2,
going from a total of 6 down to 4 allocations.
Change-Id: I09207a00c4b7afb44c7773d752c5628a07e24fda
Reviewed-on: https://go-review.googlesource.com/c/go/+/473535 Reviewed-by: Ian Lance Taylor <iant@google.com>
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Joe Tsai [Mon, 20 Feb 2023 07:19:20 +0000 (23:19 -0800)]
encoding: add AppendEncode and AppendDecode
Implement append-like equivalent of Encode and Decode functions.
Fixes #53693
Change-Id: I79d8d834e3c8f77fad32be2fd391e33d4d1527ea
Reviewed-on: https://go-review.googlesource.com/c/go/+/504884 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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ch3nnn [Wed, 16 Aug 2023 12:28:11 +0000 (12:28 +0000)]
fmt: fix receiver names are different
"buffer" call the receiver "b" in other method, don't call it "bp" in
another. Keep the same receiver names, as prescribed in Go Code Review
Comments (https://go.dev/s/style#receiver-names).
Change-Id: I9fafc799a9e4102419ed743b941bca74e908f5c0
GitHub-Last-Rev: c8b851d372f3966e3c5eec7c331ad05aacb1ebda
GitHub-Pull-Request: golang/go#62066
Reviewed-on: https://go-review.googlesource.com/c/go/+/520016
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Matthew Dempsky [Tue, 15 Aug 2023 21:02:37 +0000 (14:02 -0700)]
cmd/compile/internal/escape: flip transient to !persists
I want to add more location properties (e.g., to track indirect stores
and calls), and it's easier to reason about them if they're all
consistent that "true" means more consequences than less.
Change-Id: I3f8674bb11877ba33082a0f5f7d8e55ad6d7a4cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/520257
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Russ Cox [Mon, 26 Jun 2023 21:12:44 +0000 (17:12 -0400)]
runtime: change mutex profile to count every blocked goroutine
The pprof mutex profile was meant to match the Google C++ (now Abseil)
mutex profiler, originally designed and implemented by Mike Burrows.
When we worked on the Go version, pjw and I missed that C++ counts the
time each thread is blocked, even if multiple threads are blocked on a
mutex. That is, if 100 threads are blocked on the same mutex for the
same 10ms, that still counts as 1000ms of contention in C++. In Go, to
date, /debug/pprof/mutex has counted that as only 10ms of contention.
If 100 goroutines are blocked on one mutex and only 1 goroutine is
blocked on another mutex, we probably do want to see the first mutex
as being more contended, so the Abseil approach is the more useful one.
This CL adopts "contention scales with number of goroutines blocked",
to better match Abseil [1]. However, it still makes sure to attribute the
time to the unlock that caused the backup, not subsequent innocent
unlocks that were affected by the congestion. In this way it still gives
more accurate profiles than Abseil does.
Bryan C. Mills [Tue, 15 Aug 2023 22:01:16 +0000 (18:01 -0400)]
os: skip Chown tests for auxiliary groups that fail due to permission errors
This addresses the failure mode described in
https://git.alpinelinux.org/aports/commit/community/go/tests-filter-overflow-gid.patch?id=9851dde0f5d2a5a50f7f3b5323d1b2ff22e1d028,
but without special-casing an implementation-specific group ID.
Jes Cok [Wed, 16 Aug 2023 10:59:58 +0000 (10:59 +0000)]
log/slog: remove redundant dot in doc
Change-Id: Ic4fcfe7335dab219790c19ded3bbb7265857404f
GitHub-Last-Rev: afc69c79b2f8d71441eb4cabaefe8cca9acc8231
GitHub-Pull-Request: golang/go#62062
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