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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There's no need for distinct hmap and hiter types for each map.
Shaves 9kB off cmd/go binary size.
Change-Id: I7bc3b2d8ec82e7fcd78c1cb17733ebd8b615990a
Reviewed-on: https://go-review.googlesource.com/c/go/+/521615
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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>
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Change-Id: I4d755e401acf670fb5a154ff59e4e4335ed2138e
GitHub-Last-Rev: a91d74ae55
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: 7e8ec44078
GitHub-Pull-Request: golang/go#60678
Reviewed-on: https://go-review.googlesource.com/c/go/+/501701
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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
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
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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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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.
This is a re-roll of CL 515277
Change-Id: Ia27529302f81c1c92fb9c3a7474739eca80bfca1
Reviewed-on: https://go-review.googlesource.com/c/go/+/520064
Auto-Submit: Austin Clements <austin@google.com>
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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.
Change-Id: Id94c0c0fb3004d1fda1b196790eebd949c621f28
Reviewed-on: https://go-review.googlesource.com/c/go/+/520063
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If we're not using the upper bits, don't bother issuing a
sign/zero extension operation.
For arm64, after CL 520916 which fixed a correctness bug with
extensions but as a side effect leaves many unnecessary ones
still in place.
Change-Id: I5f4fe4efbf2e9f80969ab5b9a6122fb812dc2ec0
Reviewed-on: https://go-review.googlesource.com/c/go/+/521496
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@google.com>
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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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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)
Fixes#62180.
For #20491.
Change-Id: If987cd9d112997c56171a7ef4fccadb360bb79bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/521596
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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.
Fixes#62119.
Updates #18678.
Change-Id: I283c6a10c46df573ff44da826f870417359226a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/521015
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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.
Change-Id: I7f7bf0cf8b22c1f6e05ff12b8be71d18fb3359d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/521177
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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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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Shave off a few allocations while reading a directory by checking
if the entry name is "." or ".." before allocating a string for it.
Change-Id: I05a87d7572bd4fc191db70aaa9e22a6102f68b4b
Reviewed-on: https://go-review.googlesource.com/c/go/+/520415
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This would have helped with debugging the failures caused by CL 515276.
Change-Id: Id641949d8bcd763de7f93778ad9bd3fdde95dcb2
Reviewed-on: https://go-review.googlesource.com/c/go/+/520062
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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
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This CL changes NewMethodExpr to directly construct the OMETHEXPR
node, instead of running through the generic OXDOT typechecking
machinery.
Change-Id: Ic2af0bab6ff1aef45e8463bccb1f69c50db68f65
Reviewed-on: https://go-review.googlesource.com/c/go/+/520919
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This CL refactors the common pattern for constructing OMETHEXPR nodes,
which is the most common use of ir.TypeNode currently.
Change-Id: I446a21af97ab5a4bc2f04bbd581c1ede8a5ede60
Reviewed-on: https://go-review.googlesource.com/c/go/+/520978
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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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No need for an explicit nil check. Slicing the input slice
down to zero capacity also preserves nil.
Change-Id: I1f53cc485373d0e65971cd87b6243650ac72612c
Reviewed-on: https://go-review.googlesource.com/c/go/+/521037
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Change-Id: I407f5d3d3a3e8b3d43ff154f731d885e831971e9
GitHub-Last-Rev: d6a400d1ba
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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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
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For #44221Fixes#62147
Change-Id: Ibcc0d11c8253f51a8f5771791ea4173a38a61950
Reviewed-on: https://go-review.googlesource.com/c/go/+/520917
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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
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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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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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As of this CL, all OLITERAL, OLINKSYMOFFSET, ONIL, and OTYPE nodes are
constructed as typed and typechecked.
Change-Id: I39b2ad772a9b0419c701890a505a0949f9ea456e
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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
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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
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The last use of this was removed in go.dev/cl/518757.
Change-Id: I41ddc9601bfa7e553b83c4c5a055104b2044d5d0
Reviewed-on: https://go-review.googlesource.com/c/go/+/520610
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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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Auto-Submit: Matthew Dempsky <mdempsky@google.com>
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
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
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This error checking code is all obsolete by types2.
Change-Id: I247cee2c847236dfbd5a878441ad712481692927
Reviewed-on: https://go-review.googlesource.com/c/go/+/520607
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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This CL updates several frontend passes to stop relying on
ir.CurFunc (at least directly).
Change-Id: I3c3529e81e27fb05d54a828f081f7c7efc31af67
Reviewed-on: https://go-review.googlesource.com/c/go/+/520606
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Steps towards eliminating implicit dependencies on base.Pos and
ir.CurFunc. Mechanical CL produced with gofmt -r.
Change-Id: I070015513cb955cbe87f9a148d81db8c0d4b0dc5
Reviewed-on: https://go-review.googlesource.com/c/go/+/520605
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Now that package initialization ordering is handled by types2 instead
of pkginit, we can get rid of this special case.
Change-Id: I4b94df02813b662498ae7d2e829119e3bb932d6e
Reviewed-on: https://go-review.googlesource.com/c/go/+/520604
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An *ir.Func is always ODCLFUNC, so no need to double-check this
anymore. The type system statically ensures we have the right Op.
Also, pkginit.initRequiredForCoverage appears to be unused, so we can
get rid of it completely.
Change-Id: If1abb35672b40f705f23c365ad2a828c2661e9c0
Reviewed-on: https://go-review.googlesource.com/c/go/+/520603
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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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Run-TryBot: Andy Pan <panjf2000@gmail.com>
Change-Id: I40595a3f598483d029473af465c756f8777ecc91
Reviewed-on: https://go-review.googlesource.com/c/go/+/520915
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Bypass: Ian Lance Taylor <iant@google.com>
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