Replace reflect.PtrTo with reflect.PointerTo.
Fixes#59599
Change-Id: I49407193e2050543ef983cd637703acc682d9f51
Change-Id: I49407193e2050543ef983cd637703acc682d9f51
GitHub-Last-Rev: 7bc9ccf1dc
GitHub-Pull-Request: golang/go#61440
Reviewed-on: https://go-review.googlesource.com/c/go/+/511035
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Same as https://go-review.googlesource.com/c/go/+/510635, reduces risk of overflow
Change-Id: I18f5560d73af76c3e853464a89ad7e42dbbd5894
GitHub-Last-Rev: 652c8c6712
GitHub-Pull-Request: golang/go#61547
Reviewed-on: https://go-review.googlesource.com/c/go/+/512200
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Change-Id: I0a55cdc38ae496e2070f0b9ef317a41f82352afd
GitHub-Last-Rev: c19527a26b
GitHub-Pull-Request: golang/go#61407
Reviewed-on: https://go-review.googlesource.com/c/go/+/510635
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The invention of base32 and base64 predates the invention of UTF-8
and was never meant to output valid UTF-8.
By default, the output is always valid ASCII (and thus valid UTF-8)
except when the user specifies an alphabet or padding value
that is larger than '\x7f'. If that is done,
then the exact byte symbol is used rather than the UTF-8 encoding.
Fixes#60689
Change-Id: I4ec88d974ec0658ad1a578bbd65a809e27c73ea7
Reviewed-on: https://go-review.googlesource.com/c/go/+/505237
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Size is defined as returning -1 if the type is not fixed-size.
Before this CL cases like Size((*[]int)(nil)) would crash.
Fixes#60892
Change-Id: Iee8e20a0aee24b542b78cb4160c3b2c5a3eb02c2
Reviewed-on: https://go-review.googlesource.com/c/go/+/504575
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Fixes#10275
Change-Id: I2b3d54f3eb0f85d65324ddc3c3b2a797d42a16c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/496537
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This change wraps the errors from the CharsetReader function so the caller can distinguish different error conditions.
Context: I have an XML file with an unknown encoding which I like to handle separately. I like to use the CharsetReader for this but the error type has not been forwarded.
Change-Id: I6739a0dee04ec376cd20536be2806ce7f50c5213
GitHub-Last-Rev: ada9dd510f
GitHub-Pull-Request: golang/go#60199
Reviewed-on: https://go-review.googlesource.com/c/go/+/494897
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This updates the doc comment to reflect the behavior of the method.
On error the method returns a partial result.
Fixes#59991
Change-Id: I71e9dfa37e0488c85abd3eeede2a1a34cb74239b
GitHub-Last-Rev: 389488e536
GitHub-Pull-Request: golang/go#60084
Reviewed-on: https://go-review.googlesource.com/c/go/+/494055
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Found by running
$ go run golang.org/x/tools/go/analysis/passes/nilness/cmd/nilness@latest std
No actual bugs--other than one panic(nil)--but a
few places where error nilness was unclear.
Change-Id: Ia916ba30f46f29c1bcf928cc62280169b922463a
Reviewed-on: https://go-review.googlesource.com/c/go/+/486675
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Like https://go.dev/cl/481376 did for encoding/gob,
but now for encoding/xml, which had very similar code.
One minor difference is that encoding/xml now needs a SetLen before the
call to Index, as otherwise we index just past the length.
Still, calling Grow and SetLen is easier to understand,
and avoids needing to make a new zero value.
goos: linux
goarch: amd64
pkg: encoding/xml
cpu: AMD Ryzen 7 PRO 5850U with Radeon Graphics
│ old │ new │
│ sec/op │ sec/op vs base │
Unmarshal-8 6.904µ ± 1% 6.980µ ± 1% +1.10% (p=0.009 n=6)
│ old │ new │
│ B/op │ B/op vs base │
Unmarshal-8 7.656Ki ± 0% 7.586Ki ± 0% -0.92% (p=0.002 n=6)
│ old │ new │
│ allocs/op │ allocs/op vs base │
Unmarshal-8 188.0 ± 0% 185.0 ± 0% -1.60% (p=0.002 n=6)
Change-Id: Id83feb467a9c59c80c7936aa892780aae7e8b809
Reviewed-on: https://go-review.googlesource.com/c/go/+/483135
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Test added.
Fixes#22860
Change-Id: I08304834a2b7b10b4ac729bf36761692eb4731da
Reviewed-on: https://go-review.googlesource.com/c/go/+/113075
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Fixes the misuse of "a" vs "an", according to English grammatical
expectations and using https://www.a-or-an.com/
Change-Id: I53ac724070e3ff3d33c304483fe72c023c7cda47
Reviewed-on: https://go-review.googlesource.com/c/go/+/480536
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Growing by one is a simpler, and often cheaper,
operation compared to appending one (newly created) zero value.
The method was introduced in Go 1.20.
growSlice in dec_helpers.go is left alone,
as it grows using the builtin append instead of reflect.Append.
No noticeable performance difference on any of our benchmarks,
as this code only runs for slices large enough to not fit in
saferio.SliceCap, and none of our benchmarks use data that large.
goos: linux
goarch: amd64
pkg: encoding/gob
cpu: AMD Ryzen 7 PRO 5850U with Radeon Graphics
│ old │ new │
│ sec/op │ sec/op vs base │
DecodeBytesSlice-8 11.37µ ± 1% 11.46µ ± 4% ~ (p=0.315 n=10)
DecodeInterfaceSlice-8 96.49µ ± 1% 95.75µ ± 1% ~ (p=0.436 n=10)
geomean 33.12µ 33.12µ +0.01%
│ old │ new │
│ B/op │ B/op vs base │
DecodeBytesSlice-8 22.39Ki ± 0% 22.39Ki ± 0% ~ (p=1.000 n=10)
DecodeInterfaceSlice-8 80.25Ki ± 0% 80.25Ki ± 0% ~ (p=0.650 n=10)
geomean 42.39Ki 42.39Ki +0.00%
│ old │ new │
│ allocs/op │ allocs/op vs base │
DecodeBytesSlice-8 169.0 ± 0% 169.0 ± 0% ~ (p=1.000 n=10) ¹
DecodeInterfaceSlice-8 3.178k ± 0% 3.178k ± 0% ~ (p=1.000 n=10) ¹
geomean 732.9 732.9 +0.00%
Change-Id: I468aebf4ae6f197a1fd35f6fee809ca591c1788f
Reviewed-on: https://go-review.googlesource.com/c/go/+/481376
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I almost exclusively use these benchmarks with -benchtime already.
Change-Id: I6539cbba6abbdb6b275502e122f4e16856d8b9e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/481375
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fieldType is a struct with only a string and an integer,
so its size will barely be three times that of a pointer.
The indirection doesn't save us any memory or append/grow cost,
but it does cause a significant amount of allocations at init time.
goos: linux
goarch: amd64
pkg: encoding/gob
cpu: AMD Ryzen 7 PRO 5850U with Radeon Graphics
│ old │ new │
│ sec/op │ sec/op vs base │
EndToEndPipe-16 730.9n ± 5% 741.6n ± 5% ~ (p=0.529 n=10)
EncodingGob 173.7µ ± 0% 171.1µ ± 0% -1.46% (p=0.000 n=10)
geomean 11.27µ 11.26µ -0.01%
│ old │ new │
│ B/op │ B/op vs base │
EndToEndPipe-16 1.766Ki ± 0% 1.766Ki ± 0% ~ (p=1.000 n=10) ¹
EncodingGob 38.27Ki ± 0% 34.30Ki ± 0% -10.38% (p=0.000 n=10)
geomean 8.221Ki 7.782Ki -5.33%
¹ all samples are equal
│ old │ new │
│ allocs/op │ allocs/op vs base │
EndToEndPipe-16 2.000 ± 0% 2.000 ± 0% ~ (p=1.000 n=10) ¹
EncodingGob 642.0 ± 0% 615.0 ± 0% -4.21% (p=0.000 n=10)
geomean 35.83 35.07 -2.13%
¹ all samples are equal
Change-Id: I852a799834d2e9b7b915da74e871a4052d13892e
Reviewed-on: https://go-review.googlesource.com/c/go/+/479400
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After the previous commit, both calls use the non-pointer type,
so we can deduplicate. No noticeable difference in init cost.
Change-Id: I0f0fb91d42655787cb58b4442ad3da4194560af4
Reviewed-on: https://go-review.googlesource.com/c/go/+/479399
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wireType itself is just a struct with seven pointer fields,
so an indirection doesn't feel necessary to noticeably reduce the amount
of memory that typeInfo takes for each Go type registered in gob.
The indirection does add a small amount of overhead though,
particularly one extra allocation when registering a type,
which is done a number of times as part of init.
For consistency, also update wireTypeUserInfo to not use a pointer.
Measuring via one of the end-to-end benchmarks and benchinit:
goos: linux
goarch: amd64
pkg: encoding/gob
cpu: AMD Ryzen 7 PRO 5850U with Radeon Graphics
│ old │ new │
│ sec/op │ sec/op vs base │
EndToEndPipe-16 736.8n ± 5% 733.9n ± 5% ~ (p=0.971 n=10)
EncodingGob 177.6µ ± 0% 173.6µ ± 0% -2.27% (p=0.000 n=10)
geomean 11.44µ 11.29µ -1.34%
│ old │ new │
│ B/op │ B/op vs base │
EndToEndPipe-16 1.766Ki ± 0% 1.766Ki ± 0% ~ (p=1.000 n=10) ¹
EncodingGob 38.47Ki ± 0% 38.27Ki ± 0% -0.50% (p=0.000 n=10)
geomean 8.241Ki 8.220Ki -0.25%
¹ all samples are equal
│ old │ new │
│ allocs/op │ allocs/op vs base │
EndToEndPipe-16 2.000 ± 0% 2.000 ± 0% ~ (p=1.000 n=10) ¹
EncodingGob 652.0 ± 0% 642.0 ± 0% -1.53% (p=0.000 n=10)
geomean 36.11 35.83 -0.77%
¹ all samples are equal
Change-Id: I528080b7d990ed595683f155a1ae25dcd26394b2
Reviewed-on: https://go-review.googlesource.com/c/go/+/479398
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The reflect method was added in Go 1.13, in 2019.
gob's own version dates all the way back to 2011.
The behavior appears to be the same, and all tests still pass.
gob does have special cases like always encoding arrays even when they
are the zero value, but that is done via the sendZero boolean field.
Change-Id: I9057b7436963e231fdbf2f6c4b1edb58a2b13305
Reviewed-on: https://go-review.googlesource.com/c/go/+/479397
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Doing this work at init time does make the first encode or decode call
slightly faster, but the cost is still paid upfront.
However, not all programs which directly or indirectly import
encoding/gob end up encoding or decoding any values.
For example, a program might only be run with the -help flag,
or it might only use gob encoding when a specific mode is enabled.
Moreover, any work done at init time needs to happen sequentially and
before the main function can start, blocking the entire program.
Using benchinit, we see a moderate saving at init time:
goos: linux
goarch: amd64
cpu: AMD Ryzen 7 PRO 5850U with Radeon Graphics
│ old │ new │
│ sec/op │ sec/op vs base │
EncodingGob 188.9µ ± 0% 175.4µ ± 0% -7.15% (p=0.000 n=10)
│ old │ new │
│ B/op │ B/op vs base │
EncodingGob 39.78Ki ± 0% 38.46Ki ± 0% -3.32% (p=0.000 n=10)
│ old │ new │
│ allocs/op │ allocs/op vs base │
EncodingGob 668.0 ± 0% 652.0 ± 0% -2.40% (p=0.000 n=10)
Change-Id: I75a5df18c9b1d02566e5885a966360d8a525913a
Reviewed-on: https://go-review.googlesource.com/c/go/+/479396
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A GeneralizedTime value may contain an optional fractional seconds
element (according to X.680 46.2, restricted by X.690 11.7.3). This
change adds support for this fractional part, up to nine digits, so that
Unmarshal won't fail when decoding a DER encoded GeneralizedTime value
with fractional digits. Also, test cases related to this change have
been added.
X.680 and X.690 can be found at:
https://www.itu.int/rec/T-REC-X.680https://www.itu.int/rec/T-REC-X.690Fixes#15842
Change-Id: If217c007e01b686db508a940e9e2ed3bfb901879
Reviewed-on: https://go-review.googlesource.com/c/go/+/108355
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I noticed the one in path/filepath while reading the docs,
and the other ones were found via some quick grepping.
Change-Id: I386f2f74ef816a6d18aa2f58ee6b64dbd0147c9e
Reviewed-on: https://go-review.googlesource.com/c/go/+/478795
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I edited dec_helpers.go without realizing that it is a generated file.
Fix the generator to generate the current version (which generates
a small comment change).
Change-Id: I70e3bc78eb0728d23c08972611218f288dc1d29c
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Fixes#59172
Change-Id: I54d5e724f10117a40ec5dd58c810f6bbb2475933
GitHub-Last-Rev: d1a986698c
GitHub-Pull-Request: golang/go#59173
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Use the explicit API for acquiring an empty available buffer,
rather than the hack that's implemented in terms of Bytes and Len.
Change-Id: If286ed42693acd61ffe28dc849ed4b76c3ae4434
Reviewed-on: https://go-review.googlesource.com/c/go/+/476337
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The folded name logic (despite all attempts to optimize it)
was fundamentally an O(n) operation where every field in a struct
needed to be linearly scanned in order to find a match.
This made unmashaling of unknown fields always O(n).
Instead of optimizing the comparison for each field,
make it such that we can look up a name in O(1).
We accomplish this by maintaining a map keyed by pre-folded names,
which we can pre-calculate when processing the struct type.
Using a stack-allocated buffer, we can fold the input name and
look up its presence in the map.
Also, instead of mapping from names to indexes,
map directly to a pointer to the field information.
The memory cost of this is the same and avoids an extra slice index.
The new logic is both simpler and faster.
Performance:
name old time/op new time/op delta
CodeDecoder 2.47ms ± 4% 2.42ms ± 2% -1.83% (p=0.022 n=10+9)
UnicodeDecoder 259ns ± 2% 248ns ± 1% -4.32% (p=0.000 n=10+10)
DecoderStream 150ns ± 1% 149ns ± 1% ~ (p=0.516 n=10+10)
CodeUnmarshal 3.13ms ± 2% 3.09ms ± 2% -1.37% (p=0.022 n=10+9)
CodeUnmarshalReuse 2.50ms ± 1% 2.45ms ± 1% -1.96% (p=0.001 n=8+9)
UnmarshalString 67.1ns ± 5% 64.5ns ± 5% -3.90% (p=0.005 n=10+10)
UnmarshalFloat64 60.1ns ± 4% 58.4ns ± 2% -2.89% (p=0.002 n=10+8)
UnmarshalInt64 51.0ns ± 4% 49.2ns ± 1% -3.53% (p=0.001 n=10+8)
Issue10335 80.7ns ± 2% 79.2ns ± 1% -1.82% (p=0.016 n=10+8)
Issue34127 28.6ns ± 3% 28.8ns ± 3% ~ (p=0.388 n=9+10)
Unmapped 177ns ± 2% 177ns ± 2% ~ (p=0.956 n=10+10)
Change-Id: I478b2b958f5a63a69c9a991a39cd5ffb43244a2a
Reviewed-on: https://go-review.googlesource.com/c/go/+/471196
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Use append for HTMLEscape similar to Indent and Compact.
Move it to indent.go alongside Compact, as it shares similar logic.
In a future CL, we will modify appendCompact to be written in terms
of appendHTMLEscape, but we need to first move the JSON decoder logic
out of the main loop of appendCompact.
Change-Id: I131c64cd53d5d2b4ca798b37349aeefe17b418c7
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v.SetZero() is faster than v.Set(reflect.Zero(v.Type()))
and was recently added in Go 1.20.
Benchmark numbers are largely unchanged since this mainly
affects the unmarshaling of large numbers of JSON nulls,
which our benchmarks do not heavily exercise.
Change-Id: I464f60f63c9027e63a99fd5da92e7ab782018329
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With native support for fuzzing in the Go toolchain,
rely instead on the fuzz tests declared in fuzz_test.go.
Change-Id: I601842cd0bc7e64ea3bfdafbbbc3534df11acf59
Reviewed-on: https://go-review.googlesource.com/c/go/+/471197
Reviewed-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Reviewed-by: Than McIntosh <thanm@google.com>
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The Grow method is generally a more efficient way to grow a slice.
The older approach of using reflect.MakeSlice has to
waste effort zeroing the elements overwritten by the older slice
and has to allocate the slice header on the heap.
Performance:
name old time/op new time/op delta
CodeDecoder 2.41ms ± 2% 2.42ms ± 2% ~
CodeUnmarshal 3.12ms ± 3% 3.13ms ± 3% ~
CodeUnmarshalReuse 2.49ms ± 3% 2.52ms ± 3% ~
name old alloc/op new alloc/op delta
CodeDecoder 2.00MB ± 1% 1.99MB ± 1% ~
CodeUnmarshal 3.05MB ± 0% 2.92MB ± 0% -4.23%
CodeUnmarshalReuse 1.68MB ± 0% 1.68MB ± 0% -0.32%
name old allocs/op new allocs/op delta
CodeDecoder 77.1k ± 0% 77.0k ± 0% -0.09%
CodeUnmarshal 92.7k ± 0% 91.3k ± 0% -1.47%
CodeUnmarshalReuse 77.1k ± 0% 77.0k ± 0% -0.07%
The Code benchmarks (which are the only ones that uses slices)
are largely unaffected. There is a slight reduction in allocations.
A histogram of slice lengths from the Code testdata is as follows:
≤1: 392
≤2: 256
≤4: 252
≤8: 152
≤16: 126
≤32: 78
≤64: 62
≤128: 46
≤256: 18
≤512: 10
≤1024: 8
A bulk majority of slice lengths are 8 elements or under.
Use of reflect.Value.Grow performs better for larger slices since
it can avoid the zeroing of memory and has a faster growth rate.
However, Grow grows starting from 1 element,
with a 2x growth rate until some threshold (currently 512),
Starting from 1 ensures better utilization of the heap,
but at the cost of more frequent regrowth early on.
In comparison, the previous logic always started
with a minimum of 4 elements, which leads to a wasted capacity
of 75% for the highly frequent case of a single element slice.
The older code always had a growth rate of 1.5x,
and so wastes less memory for number of elements below 512.
All in all, there are too many factors that hurt or help performance.
Rergardless, the simplicity of favoring reflect.Value.Grow
over manually managing growth rates is a welcome simplification.
Change-Id: I62868a7f112ece3c2da3b4f6bdf74d397110243c
Reviewed-on: https://go-review.googlesource.com/c/go/+/471175
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Reviewed-by: Ian Lance Taylor <iant@google.com>
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Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
As part of the effort to rely less on bytes.Buffer,
switch most operations to use more natural append-like operations.
This makes it easier to swap bytes.Buffer out with a buffer type
that only needs to support a minimal subset of operations.
As a simplification, we can remove the use of the scratch buffer
and use the available capacity of the buffer itself as the scratch.
Also, declare an inlineable mayAppendQuote function to conditionally
append a double-quote if necessary.
Performance:
name old time/op new time/op delta
CodeEncoder 405µs ± 2% 397µs ± 2% -1.94% (p=0.000 n=20+20)
CodeEncoderError 453µs ± 1% 444µs ± 4% -1.83% (p=0.000 n=19+19)
CodeMarshal 559µs ± 4% 548µs ± 2% -2.02% (p=0.001 n=19+17)
CodeMarshalError 724µs ± 3% 716µs ± 2% -1.13% (p=0.030 n=19+20)
EncodeMarshaler 24.9ns ±15% 22.9ns ± 5% ~ (p=0.086 n=20+17)
EncoderEncode 14.0ns ±27% 15.0ns ±20% ~ (p=0.365 n=20+20)
There is a slight performance gain across the board due to
the elimination of the scratch buffer. Appends are done directly
into the unused capacity of the underlying buffer,
avoiding an additional copy. See #53685
Updates #27735
Change-Id: Icf6d612a7f7a51ecd10097af092762dd1225d49e
Reviewed-on: https://go-review.googlesource.com/c/go/+/469558
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
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This is part of the effort to reduce direct reliance on bytes.Buffer
so that we can use a buffer with better pooling characteristics.
Unify these two methods as a single version that uses generics
to reduce duplicated logic. Unfortunately, we lack a generic
version of utf8.DecodeRune (see #56948), so we cast []byte to string.
The []byte variant is slightly slower for multi-byte unicode since
casting results in a stack-allocated copy operation.
Fortunately, this code path is used only for TextMarshalers.
We can also delete TestStringBytes, which exists to ensure
that the two duplicate implementations remain in sync.
Performance:
name old time/op new time/op delta
CodeEncoder 399µs ± 2% 409µs ± 2% +2.59% (p=0.000 n=9+9)
CodeEncoderError 450µs ± 1% 451µs ± 2% ~ (p=0.684 n=10+10)
CodeMarshal 553µs ± 2% 562µs ± 3% ~ (p=0.075 n=10+10)
CodeMarshalError 733µs ± 3% 737µs ± 2% ~ (p=0.400 n=9+10)
EncodeMarshaler 24.9ns ±12% 24.1ns ±13% ~ (p=0.190 n=10+10)
EncoderEncode 12.3ns ± 3% 14.7ns ±20% ~ (p=0.315 n=8+10)
name old speed new speed delta
CodeEncoder 4.87GB/s ± 2% 4.74GB/s ± 2% -2.53% (p=0.000 n=9+9)
CodeEncoderError 4.31GB/s ± 1% 4.30GB/s ± 2% ~ (p=0.684 n=10+10)
CodeMarshal 3.51GB/s ± 2% 3.46GB/s ± 3% ~ (p=0.075 n=10+10)
CodeMarshalError 2.65GB/s ± 3% 2.63GB/s ± 2% ~ (p=0.400 n=9+10)
name old alloc/op new alloc/op delta
CodeEncoder 327B ±347% 447B ±232% +36.93% (p=0.034 n=9+10)
CodeEncoderError 142B ± 1% 143B ± 0% ~ (p=1.000 n=8+7)
CodeMarshal 1.96MB ± 2% 1.96MB ± 2% ~ (p=0.468 n=10+10)
CodeMarshalError 2.04MB ± 3% 2.03MB ± 1% ~ (p=0.971 n=10+10)
EncodeMarshaler 4.00B ± 0% 4.00B ± 0% ~ (all equal)
EncoderEncode 0.00B 0.00B ~ (all equal)
name old allocs/op new allocs/op delta
CodeEncoder 0.00 0.00 ~ (all equal)
CodeEncoderError 4.00 ± 0% 4.00 ± 0% ~ (all equal)
CodeMarshal 1.00 ± 0% 1.00 ± 0% ~ (all equal)
CodeMarshalError 6.00 ± 0% 6.00 ± 0% ~ (all equal)
EncodeMarshaler 1.00 ± 0% 1.00 ± 0% ~ (all equal)
EncoderEncode 0.00 0.00 ~ (all equal)
There is a very slight performance degradation for CodeEncoder
due to an increase in allocation sizes. However, the number of allocations
did not change. This is likely due to remote effects of the growth rate
differences between bytes.Buffer and the builtin append function.
We shouldn't overly rely on the growth rate of bytes.Buffer anyways
since that is subject to possibly change in #51462.
As the benchtime increases, the alloc/op goes down indicating
that the amortized memory cost is fixed.
Updates #27735
Change-Id: Ie35e480e292fe082d7986e0a4d81212c1d4202b3
Reviewed-on: https://go-review.googlesource.com/c/go/+/469556
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
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Reviewed-by: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
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This is part of the effort to reduce direct reliance on bytes.Buffer
so that we can use a buffer with better pooling characteristics.
Avoid direct use of bytes.Buffer in Compact and Indent and
instead modify the logic to rely only on append.
This avoids reliance on the bytes.Buffer.Truncate method,
which makes switching to a custom buffer implementation easier.
Performance:
name old time/op new time/op delta
EncodeMarshaler 25.5ns ± 8% 25.7ns ± 9% ~ (p=0.724 n=10+10)
name old alloc/op new alloc/op delta
EncodeMarshaler 4.00B ± 0% 4.00B ± 0% ~ (all equal)
name old allocs/op new allocs/op delta
EncodeMarshaler 1.00 ± 0% 1.00 ± 0% ~ (all equal)
Updates #27735
Change-Id: I8cded03fab7651d43b5a238ee721f3472530868e
Reviewed-on: https://go-review.googlesource.com/c/go/+/469555
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This reverts CL 461958 and CL 465855.
Reason for revert: This introduced an irreconcilable inconsistency with Encode
Fixes#58391.
Change-Id: Ifd01a04d433b24c092b73e627b8149a5851c2bca
Reviewed-on: https://go-review.googlesource.com/c/go/+/469615
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By convention, use `err` as prefix for variables of type `error`.
Change-Id: I9401d5d47e994a27be245b2c8b1edd55cdd52db1
Reviewed-on: https://go-review.googlesource.com/c/go/+/467536
Auto-Submit: Ian Lance Taylor <iant@google.com>
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CL 461958 fixed a potential panic,
but also introduced an observable regression where
invalid input could be detected before the panic occurs.
Adjust the check to preserve prior behavior,
while also preventing the panic.
Change-Id: I52819f88a6a64883fbc9fd512697c38c29ca0ccd
Reviewed-on: https://go-review.googlesource.com/c/go/+/465855
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The namespace defined by xmlns="value" can be overridden in every included tag
by the empty namespace xmlns="" without a prefix.
Method to calculate indent of XML handles depth of tag and its associated namespace is
still active even when no indent is required.
An XMLName field in a struct means that namespace must be enforced even if empty.
This occurs only on an inner tag as an override of any non-empty namespace of its outer tag.
An attribute is added to have the required namespace display.
Fixes#7113
Change-Id: I57f2308e98c66f04108ab136d350bdc3a6091e98
Reviewed-on: https://go-review.googlesource.com/c/go/+/108796
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Updates #57237
Change-Id: Ib626610130cae9c1d1aff5dd2a5035ffde0e127f
Reviewed-on: https://go-review.googlesource.com/c/go/+/463985
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Updates #57237
Change-Id: I149c8b7eeac91b87b5810250f96d48ca87135807
Reviewed-on: https://go-review.googlesource.com/c/go/+/463218
Reviewed-by: Ian Lance Taylor <iant@google.com>
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hex.Decode never checks the length of dst and triggers a panic
if there are insufficient bytes in the slice.
There isn't document on what the behavior *should* be in this case.
Two possibilities:
1. Error dst has insufficient space (as done in this change)
2. Reduce the length of the decode to min(dst, src)
Option 1 was chosen because it seems the least surprising or
subtle.
Change-Id: I3bf029e3d928202de716830434285e3c165f26dd
Reviewed-on: https://go-review.googlesource.com/c/go/+/461958
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https://go.dev/cl/460543 stopped using the "expect" parameter in
bootstrapType, but we forgot to actually remove it.
While here, staticcheck correctly points out that we can use the copy
builtin to fill builtinIdToTypeSlice, now that it and idToType are an
array and slice respectively.
Change-Id: I48078415ab9bdd5633cf41f33ab4dc78eb30b48a
Reviewed-on: https://go-review.googlesource.com/c/go/+/462301
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Avoid unnecessary allocations when calling reflect.TypeOf;
we can use nil pointers, which fit into an interface without allocating.
This saves about 1% of CPU time.
The builtin types are limited to typeIds between 0 and firstUserId,
and since firstUserId is 64, builtinIdToType does not need to be a map.
We can simply use an array of length firstUserId, which is simpler.
This saves about 1% of CPU time.
idToType is similar to firstUserId in that it is a map keyed by typeIds.
The difference is that it can grow with the user's types.
However, each added type gets the next available typeId,
meaning that we can use a growing slice, similar to the case above.
nextId then becomes the current length of the slice.
This saves about 1% of CPU time.
typeInfoMap is stored globally as an atomic.Value,
where each modification loads the map, makes a whole copy,
adds the new element, and stores the modified copy.
This is perfectly fine when the user registers types,
as that can happen concurrently and at any point in the future.
However, during init time, we sequentially register many types,
and the overhead of copying maps adds up noticeably.
During init time, use a regular global map instead,
which gets replaced by the atomic.Value when our init work is done.
This saves about 2% of CPU time.
Finally, avoid calling checkId in bootstrapType;
we have just called setTypeId, whose logic for getting nextId is simple,
so the extra check doesn't gain us much.
This saves about 1% of CPU time.
Using benchinit, which transforms GODEBUG=inittrace=1 data into Go
benchmark compatible output, results in a nice improvement:
name old time/op new time/op delta
EncodingGob 175µs ± 0% 162µs ± 0% -7.45% (p=0.016 n=5+4)
name old alloc/op new alloc/op delta
EncodingGob 39.0kB ± 0% 36.1kB ± 0% -7.35% (p=0.016 n=5+4)
name old allocs/op new allocs/op delta
EncodingGob 588 ± 0% 558 ± 0% -5.10% (p=0.000 n=5+4)
Updates #26775.
Change-Id: I28618e8b96ef440480e666ef2cd5c4a9a332ef21
Reviewed-on: https://go-review.googlesource.com/c/go/+/460543
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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End-of-line comments are not doc comments,
so Deprecated notes in them are not recognized
as deprecation notices. Rewrite the comments.
Change-Id: I275fa9aec403132fda45853e52daa22bc06fcd36
Reviewed-on: https://go-review.googlesource.com/c/go/+/453617
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This reverts CL 105636.
Reason for revert: Fails with existing XML data. At this stage in the release cycle we should revert, and try again next time with some way to support existing XML.
For #8068
Change-Id: Ia84cbf3a84878ac7190f72998545dee22c36c45e
Reviewed-on: https://go-review.googlesource.com/c/go/+/453996
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Change-Id: I69065f8adf101fdb28682c55997f503013a50e29
Reviewed-on: https://go-review.googlesource.com/c/go/+/449757
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Joedian Reid <joedian@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
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Add test.
Fixes#20396
Change-Id: I89e9013eb338f831e1908e390b284794df78fb6b
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qiulaidongfeng
chanxuehong
Jes Cok
Joe Tsai
Ian Lance Taylor
Sean Liao
Thuy Linh Luu
IvoGoman
Alan Donovan
Daniel Martí
Constantin Konstantinidis
cui fliter
Mateusz Poliwczak
Michael Teichgraeber
Johan Abildskov
Oleksandr Redko
cuiweixie
Benjamin Prosnitz
Russ Cox