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In the Go language a type assertion of a nil interface value
will always report false:
var err error
v, ok := err.(error) // always reports (nil, false)
Consequently, assertion on a reflect.Value.Interface()
will also report false:
var err error
rv := ValueOf(&err).Elem()
v, ok := rv.Interface().(error) // reports (nil, false)
However, prior to this change, a TypeAssert would report true:
var err error
rv := ValueOf(&err).Elem()
v, ok := TypeAssert[error](rv) // reports (nil, true)
when it should report false.
This fixes TypeAssert to match the Go language by
pushing the typ != v.typ check to the very end after
we have validated that neither v nor T are interface kinds.
Fixes #74404
Change-Id: Ie14d5cf18c8370c3e27ce4bdf4570c89519d8a16
Reviewed-on: https://go-review.googlesource.com/c/go/+/684675
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
Reviewed-by: Mateusz Poliwczak <mpoliwczak34@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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This is part of a series of CLs that aim to help allocations
in reflect and reduce how often interface arguments escape
for the print functions in fmt.
Before this change, the reflect.Value parameter for packEface leaks
immediately to the heap due to the various ODOTPTR operations on the
*emptyInterface. The -m=2 logs report:
parameter v leaks to <heap> for packEface with derefs=0:
flow: <heap> ← v:
from v.ptr (dot) at .\value.go:145:13
from e.word = v.ptr (assign) at .\value.go:145:10
After this change, the input leaks to the result, which is what
we want:
parameter v leaks to ~r0 with derefs=0:
flow: e = v:
from v.ptr (dot) at .\value.go:143:13
from e.Data = v.ptr (assign) at .\value.go:143:10
flow: ~r0 = e:
from &e (address-of) at .\value.go:147:32
from *(*any)(unsafe.Pointer(&e)) (indirection) at .\value.go:147:9
from return *(*any)(unsafe.Pointer(&e)) (return) at .\value.go:147:2
This change here is needed, but reflect.Value.Interface still leaks its
input to the heap for other reasons having to do with method values,
which we attempt to address in CL 530097, CL 530095, and CL 530096.
Updates #8618
Updates #71349
Change-Id: Ie77bc850ff261212eeafe190bd6f9a879676a51d
Reviewed-on: https://go-review.googlesource.com/c/go/+/528535
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: qiu laidongfeng2 <2645477756@qq.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Our prior CL 649078 teaches the compiler to use a pointer to
runtime.zeroVal as the data pointer for an interface in cases it where
it can see that a zero value struct or array is being used in
an interface conversion.
This applies to some uses with reflect, such as:
s := S{}
v := reflect.ValueOf(s)
This CL builds on that to do a cheap pointer check in reflect.IsZero
to see if the Value points to runtime.zeroVal, which means it is a zero
value.
An alternative might be to do an initial pointer check in the typ.Equal
function for types where it makes sense to do but doesn't already.
This CL gives a performance boost of -51.71% geomean for
BenchmarkZero/IsZero, with most of the impact there on
arrays of structs. (The left column is CL 649078 and the right column
is this CL).
goos: linux
goarch: amd64
pkg: reflect
cpu: Intel(R) Xeon(R) CPU @ 2.80GHz
│ find-zeroVal │ check-zeroVal │
│ sec/op │ sec/op vs base │
Zero/IsZero/ByteArray/size=16-4 4.171n ± 0% 3.123n ± 0% -25.13% (p=0.000 n=20)
Zero/IsZero/ByteArray/size=64-4 3.864n ± 0% 3.129n ± 0% -19.02% (p=0.000 n=20)
Zero/IsZero/ByteArray/size=1024-4 3.878n ± 0% 3.126n ± 0% -19.39% (p=0.000 n=20)
Zero/IsZero/BigStruct/size=1024-4 5.061n ± 0% 3.273n ± 0% -35.34% (p=0.000 n=20)
Zero/IsZero/SmallStruct/size=16-4 4.191n ± 0% 3.275n ± 0% -21.87% (p=0.000 n=20)
Zero/IsZero/SmallStructArray/size=64-4 8.636n ± 0% 3.127n ± 0% -63.79% (p=0.000 n=20)
Zero/IsZero/SmallStructArray/size=1024-4 80.055n ± 0% 3.126n ± 0% -96.10% (p=0.000 n=20)
Zero/IsZero/Time/size=24-4 3.865n ± 0% 3.274n ± 0% -15.29% (p=0.000 n=20)
geomean 6.587n 3.181n -51.71%
Note these are of course micro benchmarks with easily predicted
branches. The extra branch we introduce in the CL might hurt if there
was for example a tight loop where 50% of the values used the
global zeroVal and 50% didn't in a way that is not well predicted,
although if the typ.Equal for many types already does an initial
pointer check, it might not matter much.
For the older BenchmarkIsZero in reflect, this change does not help.
(The compiler does not use the global zeroVal as the data word for the
interfaces in this benchmark because values are part of a larger value
that is too big to be used in the global zeroVal, and also a piece of
the larger value is mutated and is not zero).
│ find-zeroVal │ check-zeroVal │
│ sec/op │ sec/op vs base │
IsZero/ArrayComparable-4 14.58n ± 0% 14.59n ± 0% ~ (p=0.177 n=20)
IsZero/ArrayIncomparable-4 163.8n ± 0% 167.5n ± 0% +2.26% (p=0.000 n=20)
IsZero/StructComparable-4 6.847n ± 0% 6.847n ± 0% ~ (p=0.703 n=20)
IsZero/StructIncomparable-4 35.41n ± 0% 35.10n ± 0% -0.86% (p=0.000 n=20)
IsZero/ArrayInt_4-4 8.631n ± 0% 8.363n ± 0% -3.10% (p=0.000 n=20)
IsZero/ArrayInt_1024-4 265.5n ± 0% 265.4n ± 0% ~ (p=0.288 n=20)
IsZero/ArrayInt_1024_NoZero-4 135.8n ± 0% 136.2n ± 0% +0.33% (p=0.000 n=20)
IsZero/Struct4Int-4 8.451n ± 0% 8.386n ± 0% -0.77% (p=0.000 n=20)
IsZero/ArrayStruct4Int_1024-4 265.2n ± 0% 266.0n ± 0% +0.30% (p=0.000 n=20)
IsZero/ArrayChanInt_1024-4 265.5n ± 0% 265.4n ± 0% ~ (p=0.605 n=20)
IsZero/StructInt_512-4 135.8n ± 0% 135.8n ± 0% ~ (p=0.396 n=20)
geomean 55.22n 55.12n -0.18%
Updates #71323
Change-Id: Ie083853a5bff03856277a293d94532a681f4a8d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/654135
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
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zero values
This is a small-ish adjustment to the change earlier in our
stack in CL 649555, which started creating read-only global storage
for a composite literal used in an interface conversion and setting
the interface data pointer to point to that global storage.
In some cases, there are execution-time performance benefits to point
to runtime.zeroVal in particular. In reflect, pointer checks against
the runtime.zeroVal memory address are used to side-step some work,
such as in reflect.Value.Set and reflect.Value.IsZero.
In this CL, we therefore dig up the zeroVal symbol, and we use the
machinery from earlier in our stack to use a pointer to zeroVal for
the interface data pointer if we see examples like:
sink = S{}
or:
s := S{}
sink = s
CL 649076 (also earlier in our stack) added most of the tests
along with debug diagnostics in convert.go to make it easier
to test this change.
We add a benchmark in reflect to show examples of performance benefit.
The left column is our immediately prior CL 649555, and the right is
this CL. (The arrays of structs here do not seem to benefit, which
we attempt to address in our next CL).
goos: linux
goarch: amd64
pkg: reflect
cpu: Intel(R) Xeon(R) CPU @ 2.80GHz
│ cl-649555 │ new │
│ sec/op │ sec/op vs base │
Zero/IsZero/ByteArray/size=16-4 4.176n ± 0% 4.171n ± 0% ~ (p=0.151 n=20)
Zero/IsZero/ByteArray/size=64-4 6.921n ± 0% 3.864n ± 0% -44.16% (p=0.000 n=20)
Zero/IsZero/ByteArray/size=1024-4 21.210n ± 0% 3.878n ± 0% -81.72% (p=0.000 n=20)
Zero/IsZero/BigStruct/size=1024-4 25.505n ± 0% 5.061n ± 0% -80.15% (p=0.000 n=20)
Zero/IsZero/SmallStruct/size=16-4 4.188n ± 0% 4.191n ± 0% ~ (p=0.106 n=20)
Zero/IsZero/SmallStructArray/size=64-4 8.639n ± 0% 8.636n ± 0% ~ (p=0.973 n=20)
Zero/IsZero/SmallStructArray/size=1024-4 79.99n ± 0% 80.06n ± 0% ~ (p=0.213 n=20)
Zero/IsZero/Time/size=24-4 7.232n ± 0% 3.865n ± 0% -46.56% (p=0.000 n=20)
Zero/SetZero/ByteArray/size=16-4 13.47n ± 0% 13.09n ± 0% -2.78% (p=0.000 n=20)
Zero/SetZero/ByteArray/size=64-4 14.14n ± 0% 13.70n ± 0% -3.15% (p=0.000 n=20)
Zero/SetZero/ByteArray/size=1024-4 24.22n ± 0% 20.18n ± 0% -16.68% (p=0.000 n=20)
Zero/SetZero/BigStruct/size=1024-4 24.24n ± 0% 20.18n ± 0% -16.73% (p=0.000 n=20)
Zero/SetZero/SmallStruct/size=16-4 13.45n ± 0% 13.10n ± 0% -2.60% (p=0.000 n=20)
Zero/SetZero/SmallStructArray/size=64-4 14.12n ± 0% 13.69n ± 0% -3.05% (p=0.000 n=20)
Zero/SetZero/SmallStructArray/size=1024-4 24.62n ± 0% 21.61n ± 0% -12.26% (p=0.000 n=20)
Zero/SetZero/Time/size=24-4 13.59n ± 0% 13.40n ± 0% -1.40% (p=0.000 n=20)
geomean 14.06n 10.19n -27.54%
Finally, here are results from the benchmark example from #71323.
Note however that almost all the benefit shown here is from our earlier
CL 649555, which is a more general purpose change and eliminates
the allocation using a different read-only global than this CL.
│ go1.24 │ new │
│ sec/op │ sec/op vs base │
InterfaceAny 112.6000n ± 5% 0.8078n ± 3% -99.28% (p=0.000 n=20)
ReflectValue 11.63n ± 2% 11.59n ± 0% ~ (p=0.330 n=20)
│ go1.24.out │ new.out │
│ B/op │ B/op vs base │
InterfaceAny 224.0 ± 0% 0.0 ± 0% -100.00% (p=0.000 n=20)
ReflectValue 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=20) ¹
│ go1.24.out │ new.out │
│ allocs/op │ allocs/op vs base │
InterfaceAny 1.000 ± 0% 0.000 ± 0% -100.00% (p=0.000 n=20)
ReflectValue 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=20) ¹
Updates #71359
Updates #71323
Change-Id: I64d8cf1a7900f011d2ec59b948388aeda1150676
Reviewed-on: https://go-review.googlesource.com/c/go/+/649078
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
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Help fix the asan builders.
Change-Id: I980f5171519643c3543bdefc6ea46fd0fca17c28
Reviewed-on: https://go-review.googlesource.com/c/go/+/674616
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
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This implementation is zero-alloc when T is a concrete type,
allocates when val contains a method or when T is a interface
and Value was obtained for example through Elem(), in which case
it has to be allocated to avoid sharing the same memory.
goos: linux
goarch: amd64
pkg: reflect
cpu: AMD Ryzen 5 4600G with Radeon Graphics
│ /tmp/bench2 │
│ sec/op │
TypeAssert/TypeAssert[int](int)-12 2.725n ± 1%
TypeAssert/TypeAssert[uint8](int)-12 2.599n ± 1%
TypeAssert/TypeAssert[fmt.Stringer](reflect_test.testTypeWithMethod)-12 8.470n ± 0%
TypeAssert/TypeAssert[fmt.Stringer](*reflect_test.testTypeWithMethod)-12 8.460n ± 1%
TypeAssert/TypeAssert[interface_{}](int)-12 4.181n ± 1%
TypeAssert/TypeAssert[interface_{}](reflect_test.testTypeWithMethod)-12 4.178n ± 1%
TypeAssert/TypeAssert[time.Time](time.Time)-12 2.839n ± 0%
TypeAssert/TypeAssert[func()_string](func()_string)-12 151.1n ± 1%
geomean 6.645n
│ /tmp/bench2 │
│ B/op │
TypeAssert/TypeAssert[int](int)-12 0.000 ± 0%
TypeAssert/TypeAssert[uint8](int)-12 0.000 ± 0%
TypeAssert/TypeAssert[fmt.Stringer](reflect_test.testTypeWithMethod)-12 0.000 ± 0%
TypeAssert/TypeAssert[fmt.Stringer](*reflect_test.testTypeWithMethod)-12 0.000 ± 0%
TypeAssert/TypeAssert[interface_{}](int)-12 0.000 ± 0%
TypeAssert/TypeAssert[interface_{}](reflect_test.testTypeWithMethod)-12 0.000 ± 0%
TypeAssert/TypeAssert[time.Time](time.Time)-12 0.000 ± 0%
TypeAssert/TypeAssert[func()_string](func()_string)-12 72.00 ± 0%
geomean ¹
Fixes #62121
Change-Id: I0911c70c5966672c930d387438643f94a40441c4
GitHub-Last-Rev: ce89a53097b53fc59ff3ce3996917f8484ad3967
GitHub-Pull-Request: golang/go#71639
Reviewed-on: https://go-review.googlesource.com/c/go/+/648056
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Replace a usage of runtime.SetFinalizer with runtime.AddCleanup in
the TestCallReturnsEmpty test. There is an additional use of
SetFinalizer in the reflect package which depends on object
resurrection and needs further refactoring to replace.
Updates #70907
Change-Id: I4c0e56c35745a225776bd611d026945efdaf96f5
Reviewed-on: https://go-review.googlesource.com/c/go/+/667595
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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The behavior is described in src/cmd/link/internal/ld/deadcode.go
but is not otherwise documented. Since the usage of those functions
could have significant caveats (longer builds, larger binaries),
we are informing the user.
Change-Id: I87571dd14aa16d7aac59fe45dfc52cb7c5b956c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/658255
Auto-Submit: Ian Lance Taylor <iant@google.com>
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For #71874.
Change-Id: I3850edfb3104305f3bf4847a73cdd826cc99837f
GitHub-Last-Rev: 574c1edb7a6152c71891fab011ac0aaeca955fc8
GitHub-Pull-Request: golang/go#71890
Reviewed-on: https://go-review.googlesource.com/c/go/+/651775
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Fixes #71905
Change-Id: I50a418f8552e071c6e5011af5b9accc7d41548d0
Reviewed-on: https://go-review.googlesource.com/c/go/+/651855
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Michael Pratt <mpratt@google.com>
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Currently method values aren't correctly handled in Seq because we call
canRangeFunc on the reciever type, not the method value type, when we're
handling a method value. reflect.Value.Type has the logic to obtain the
method value type from the Value.
This change slightly refactors reflect.Value.Type into a separate
function so we can obtain the correct type as an abi.Type and pass it
off to canRangeFunc (and canRangeFunc2).
Fixes #71874.
Change-Id: Ie62dfca2a84b8f2f816bb87ff1ed1a58a7bb8122
Reviewed-on: https://go-review.googlesource.com/c/go/+/651416
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In particular, we apply it only to functions where it is always
a code improvement to inline the call.
We also apply it to some constants.
In a few cases this may introduce a panic statement at the
caller, which is debatable, but making the potential for panic
evident is the purpose of the deprecation.
The gofix analyzer in gopls v0.18 will show a diagnostic for calls
to the annotated functions, and will offer to inline the call.
The new //go:fix annotation needs a special exemption in the
pragma check in the compiler.
Updates #32816
Change-Id: I43bf15648ac12251734109eb7102394f8a76d55e
Reviewed-on: https://go-review.googlesource.com/c/go/+/648995
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Commit-Queue: Alan Donovan <adonovan@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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goos: linux
goarch: amd64
pkg: reflect
cpu: AMD Ryzen 5 4600G with Radeon Graphics
│ /tmp/before │ /tmp/after │
│ sec/op │ sec/op vs base │
TypeForString-12 2.091n ± 1% 1.174n ± 1% -43.84% (p=0.000 n=20)
TypeForError-12 7.5810n ± 3% 0.9372n ± 1% -87.64% (p=0.000 n=20)
Change-Id: I22022f99b2dd2029f02d9ed8477b209adf7e9496
GitHub-Last-Rev: 64d2ac5bb2f3b2a659663832a4641ff4fc83bddd
GitHub-Pull-Request: golang/go#71654
Reviewed-on: https://go-review.googlesource.com/c/go/+/648395
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Change-Id: I0af1903ed1e4f2bf4ea273847b024520c577ef6d
Reviewed-on: https://go-review.googlesource.com/c/go/+/642496
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Auto-Submit: Ian Lance Taylor <iant@golang.org>
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mapiterinit allows external linkname. These users must allocate their
own iter struct for initialization by mapiterinit. Since the type is
unexported, they also must define the struct themselves. As a result,
they of course define the struct matching the old hiter definition (in
map_noswiss.go).
The old definition is smaller on 32-bit platforms. On those platforms,
mapiternext will clobber memory outside of the caller's allocation.
On all platforms, the pointer layout between the old hiter and new
maps.Iter does not match. Thus the GC may miss pointers and free
reachable objects early, or it may see non-pointers that look like heap
pointers and throw due to invalid references to free objects.
To avoid these issues, we must keep mapiterinit and mapiternext with the
old hiter definition. The most straightforward way to do this is to use
mapiterinit and mapiternext as a compatibility layer between the old and
new iter types.
The first step to that is to move normal map use off of these functions,
which is what this CL does.
Introduce new mapIterStart and mapIterNext functions that replace the
former functions everywhere in the toolchain. These have the same
behavior as the old functions.
This CL temporarily makes the old functions throw to ensure we don't
have hidden dependencies on them. We cannot remove them entirely because
GOEXPERIMENT=noswissmap still uses the old names, and internal/goobj
requires all builtins to exist regardless of GOEXPERIMENT. The next CL
will introduce the compatibility layer.
I want to avoid using linkname between runtime and reflect, as that
would also allow external linknames. So mapIterStart and mapIterNext are
duplicated in reflect, which can be done trivially, as it imports
internal/runtime/maps.
For #71408.
Change-Id: I6a6a636c6d4bd1392618c67ca648d3f061afe669
Reviewed-on: https://go-review.googlesource.com/c/go/+/643898
Auto-Submit: Michael Pratt <mpratt@google.com>
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Fixes #70760
Change-Id: Ia00723698b7e502fa2c63f8f1dbe1143af22e0a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/634799
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
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This finds the bug fixed in CL 630279.
reflect mutates the SwissMapType of a map[unsafe.Pointer]unsafe.Pointer,
which happened to already have the correct GroupSize for all of the maps
used in the reflect tests.
For #54766.
Change-Id: If4428e1e799598e7512edceb3cefb2ad00cfa712
Reviewed-on: https://go-review.googlesource.com/c/go/+/630676
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This was missed in CL 627716.
For #54766.
Change-Id: Ib987efa8abe6e89367e2e1b71a33b64ac6b01b1f
Reviewed-on: https://go-review.googlesource.com/c/go/+/630279
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
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Instead, have the runtime build the gc bitmaps on demand
at runtime.
Change-Id: If7a245bc62e4bce3ce80972410b0ed307d921abe
Reviewed-on: https://go-review.googlesource.com/c/go/+/616255
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Fixes #70189
Fixes #59411
Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest-noswissmap
Change-Id: I4ef7ecd7e996330189309cb2a658cf34bf9e1119
Reviewed-on: https://go-review.googlesource.com/c/go/+/625275
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
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Add all the specialized variants that exist for the existing maps.
Like the existing maps, the fast variants do not support indirect
key/elem.
Note that as of this CL, the Get and Put methods on Map/table are
effectively dead. They are only reachable from the internal/runtime/maps
unit tests.
For #54766.
Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest-swissmap
Change-Id: I95297750be6200f34ec483e4cfc897f048c26db7
Reviewed-on: https://go-review.googlesource.com/c/go/+/616463
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We use the same heuristics as existing maps.
For #54766.
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Change-Id: I44bb51483cae2c1714717f1b501850fb9e55a39a
Reviewed-on: https://go-review.googlesource.com/c/go/+/616461
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First, skip all the allocation count tests.
In some cases this aligns with existing skips for -race, but in others
we've got new issues. These are debug modes, so some performance loss is
expected, and this is clearly no worse than today where the tests fail.
Next, skip internal linking and static linking tests for msan and asan.
With asan we get an explicit failure that neither are supported by the C
and/or Go compilers. With msan, we only get the Go compiler telling us
internal linking is unavailable. With static linking, we segfault
instead. Filed #70080 to track that.
Next, skip some malloc tests with asan that don't quite work because of
the redzone.
This is because of some sizeclass assumptions that get broken with the
redzone and the fact that the tiny allocator is effectively disabled
(again, due to the redzone).
Next, skip some runtime/pprof tests with asan, because of extra
allocations.
Next, skip some malloc tests with asan that also fail because of extra
allocations.
Next, fix up memstats accounting for arenas when asan is enabled. There
is a bug where more is added to the stats than subtracted. This also
simplifies the accounting a little.
Next, skip race tests with msan or asan enabled; they're mutually
incompatible.
Fixes #70054.
Fixes #64256.
Fixes #64257.
For #70079.
For #70080.
Change-Id: I99c02a0b9d621e44f1f918b307aa4a4944c3ec60
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Use the new SwissTable-based map in internal/runtime/maps as the basis
for the runtime map when GOEXPERIMENT=swissmap.
Integration is complete enough to pass all.bash. Notable missing
features:
* Race integration / concurrent write detection
* Stack-allocated maps
* Specialized "fast" map variants
* Indirect key / elem
For #54766.
Cq-Include-Trybots: luci.golang.try:gotip-linux-ppc64_power10,gotip-linux-amd64-longtest-swissmap
Change-Id: Ie97b656b6d8e05c0403311ae08fef9f51756a639
Reviewed-on: https://go-review.googlesource.com/c/go/+/594596
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
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Change-Id: Ia0e3d668a2435b2ee72e1c641092445902168e4a
Reviewed-on: https://go-review.googlesource.com/c/go/+/587875
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It makes use of the hiter structure which matches runtime.hiter's.
This change mainly improves the performance of Next method of MapIter.
goos: darwin
goarch: arm64
pkg: reflect
cpu: Apple M2
│ ./old.txt │ ./new.txt │
│ sec/op │ sec/op vs base │
MapIterNext-8 61.95n ± 0% 54.95n ± 0% -11.28% (p=0.000 n=10)
for the change of `test/escape_reflect.go`:
removing mapiterkey, mapiterelem would cause leaking MapIter content
when calling SetIterKey and SetIterValue,
and this may cause map bucket to be allocated on heap instead of stack.
Reproduce:
```
{
m := map[int]int{1: 2} // escapes to heap after this change
it := reflect.ValueOf(m).MapRange()
it.Next()
var k, v int
reflect.ValueOf(&k).Elem().SetIterKey(it)
reflect.ValueOf(&v).Elem().SetIterValue(it)
println(k, v)
}
```
This CL would not introduce abi.NoEscape to fix this. It may need futher
optimization and tests on hiter field usage and its escape analysis.
Fixes #69416
Change-Id: Ibaa33bcf86228070b4a505b9512680791aa59f04
Reviewed-on: https://go-review.googlesource.com/c/go/+/612616
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Use assembler to make runtime.staticuint64s into a readonly array
so that the reflect package can safely create a slice without requiring
any allocation.
Fixes #2320
Fixes #68380
Change-Id: If2c97238eca782d0632db265c840581d4ecb9d18
Reviewed-on: https://go-review.googlesource.com/c/go/+/597855
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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CL 580779 accidentally committed an un-gofmt-ed all_test.go
Change-Id: I071ad8d8d08cab12032ff8d3eebecb55e808f14a
Reviewed-on: https://go-review.googlesource.com/c/go/+/610561
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Temporary measure to reduce the required MVP code.
For #54766.
Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest-swissmap
Change-Id: I44dc8acd0dc8280c6beb40451998e84bc85c238a
Reviewed-on: https://go-review.googlesource.com/c/go/+/580915
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The two map implementations are still identical, but now the compiler
targets the appropriate ABI depending on GOEXPERIMENT.
For #54766.
Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest,gotip-linux-amd64-longtest-swissmap
Change-Id: I8438f64f044ba9de30ddbf2b8ceb9b4edd2d5614
Reviewed-on: https://go-review.googlesource.com/c/go/+/580779
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The _swiss.go files are identical to the originals (except build tag).
Later CLs will change them.
For #54766.
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Change-Id: I9943e2d6f1cfa227ffbf27c9ddc9ce853695d225
Reviewed-on: https://go-review.googlesource.com/c/go/+/580778
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Add two tests that verify that MapOf sets the map NeedsKeyUpdate and
HashMightPanic flags in the created map. Missing these flags would cause
correctness issues not otherwise caught in the reflect tests.
For #54766.
Change-Id: Icd5f117e0794e7b4d1b70fa94e5afbe97c4543e3
Reviewed-on: https://go-review.googlesource.com/c/go/+/594656
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The abi.NoEscape function is introduced to replace all usages of
noescape wrapper in the standard library. However, the last usage in
reflect package is still present, because the inlining test failed if
abi.NoEscape were used. The reason is that reflect.noescape is treated
as a cheap call, while abi.NoEscape is not.
By treating abi.NoEscape a cheap call, the last usage of noescape in
reflect package can now be removed.
Change-Id: I798079780129221a5a26cbcb18c95ee30855b784
Reviewed-on: https://go-review.googlesource.com/c/go/+/601275
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Cleanup and friction reduction
For #65355.
Change-Id: Ia14c9dc584a529a35b97801dd3e95b9acc99a511
Reviewed-on: https://go-review.googlesource.com/c/go/+/600436
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Add linknames for most modules with ≥50 dependents.
Add linknames for a few other modules that we know
are important but are below 50.
Remove linknames from badlinkname.go that do not merit
inclusion (very small number of dependents).
We can add them back later if the need arises.
Fixes #67401. (For now.)
Change-Id: I1e49fec0292265256044d64b1841d366c4106002
Reviewed-on: https://go-review.googlesource.com/c/go/+/587756
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For #67401.
Change-Id: I015408a3f437c1733d97160ef2fb5da6d4efcc5c
Reviewed-on: https://go-review.googlesource.com/c/go/+/587598
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For #67401.
Change-Id: I3ae93042dffd0683b7e6d6225536ae667749515b
Reviewed-on: https://go-review.googlesource.com/c/go/+/587221
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Doing this because the slices functions are slightly faster and
slightly easier to use. It also removes one dependency layer.
This CL does not change packages that are used during bootstrap,
as the bootstrap compiler does not have the required slices functions.
It does not change the go/scanner package because the ErrorList
Len, Swap, and Less methods are part of the Go 1 API.
Change-Id: If52899be791c829198e11d2408727720b91ebe8a
Reviewed-on: https://go-review.googlesource.com/c/go/+/587655
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Note that this depends on the revert of CL 581395 to move zeroVal back.
For #67401.
Change-Id: I507c27c2404ad1348aabf1ffa3740e6b1957495b
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This reverts CL 581395, commit 2f5b420fb5984842afab37a9c2e66e6599107483.
It breaks a linkname from github.com/ugorji/go/codec.
For #67401.
A followup CL will document this dependence.
Change-Id: I66d6c39c03e769ab829ca4c3f4f61277b93380d3
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For #67401.
Change-Id: I51f5b561ee11eb242e3b1585d591281d0df4fc24
Reviewed-on: https://go-review.googlesource.com/c/go/+/587215
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Change-Id: Id63ede5d50a8b287bc0b96382f9f3ee6c2e0b834
Reviewed-on: https://go-review.googlesource.com/c/go/+/586856
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CL 585358 adds restrictions to disallow pull-only linknames
(currently off by default). Currently, there are quite some pull-
only linknames in user code in the wild. In order not to break
those, we add push linknames to allow them to be pulled. This CL
includes linknames found in a large code corpus (thanks Matthew
Dempsky and Michael Pratt for the analysis!), that are not
currently linknamed.
Updates #67401.
Change-Id: I32f5fc0c7a6abbd7a11359a025cfa2bf458fe767
Reviewed-on: https://go-review.googlesource.com/c/go/+/586137
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To be consistent with other tests.
Change-Id: Ibea1d3bf57a295f024e05173d17112ce46a4f0bc
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Change-Id: If1d3eba9a922ac6f9d78301bb8f07e445c712899
Reviewed-on: https://go-review.googlesource.com/c/go/+/525576
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See CL 557596, according to the go specification,
the iterated variable type should
be the same as the iterated integer type.
For #66056
Change-Id: I96c87440328c2c50c40d76ecf2f222a331be1ce9
GitHub-Last-Rev: 8f80e401e5d7e092290d94e2bfcac89f3e04c2c5
GitHub-Pull-Request: golang/go#67269
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Change-Id: Ic88ef6b60b5a772865603971411fd5d37ef45006
Reviewed-on: https://go-review.googlesource.com/c/go/+/584656
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CL 583755 removed all uses of the ifaceIndir function,
and the function itself. Unfortunately, ifaceIndir is accessed
using go:linkname by the popular github.com/goccy/go-json package.
A bug has been filed to fix this upstream:
https://github.com/goccy/go-json/issues/506
Until that bug is fixed and the fix is distributed,
keep this function available.
With luck we can remove this in the 1.24 release.
For #67279
Change-Id: I15fccf82d7a172a0b15cdbefb0a0a48381998938
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For #66056
Change-Id: Ib47c07b2527d8213584b72e2575a353f2deaed68
GitHub-Last-Rev: 525a5c3fa469fcccfb1ab67b61c7d12e024cfb33
GitHub-Pull-Request: golang/go#67268
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Fixes #66056
Change-Id: I1e24636e43e68cd57576c39b014e0826fb6c322c
GitHub-Last-Rev: 319ad8ea7cd5326d23f9fddb9607924326aaf927
GitHub-Pull-Request: golang/go#66824
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