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net/url: avoid string concatenation in resolvePath
ame old time/op new time/op delta String-12 8.09µs ± 7% 8.20µs ± 5% ~ (p=0.347 n=20+19) ResolvePath-12 223ns ± 8% 170ns ± 7% -23.84% (p=0.000 n=20+19) QueryEscape/#00-12 72.9ns ± 5% 73.6ns ± 6% ~ (p=0.337 n=20+20) QueryEscape/#01-12 467ns ± 5% 467ns ± 7% ~ (p=0.612 n=19+20) QueryEscape/#02-12 257ns ± 8% 262ns ± 8% ~ (p=0.080 n=20+20) QueryEscape/#03-12 553ns ±12% 568ns ± 8% +2.73% (p=0.048 n=20+19) QueryEscape/#04-12 4.45µs ± 7% 4.52µs ± 5% ~ (p=0.163 n=20+20) PathEscape/#00-12 119ns ± 9% 121ns ± 6% ~ (p=0.140 n=20+20) PathEscape/#01-12 458ns ± 7% 483ns ± 4% +5.49% (p=0.000 n=20+20) PathEscape/#02-12 255ns ± 7% 257ns ± 7% ~ (p=0.560 n=20+20) PathEscape/#03-12 556ns ± 8% 559ns ± 8% ~ (p=0.799 n=20+20) PathEscape/#04-12 4.14µs ± 6% 4.28µs ± 8% +3.30% (p=0.003 n=20+20) QueryUnescape/#00-12 72.2ns ± 8% 74.9ns ± 5% +3.66% (p=0.006 n=20+19) QueryUnescape/#01-12 223ns ± 7% 230ns ± 8% +2.84% (p=0.016 n=20+20) QueryUnescape/#02-12 200ns ± 7% 203ns ±10% ~ (p=0.533 n=20+20) QueryUnescape/#03-12 480ns ± 7% 500ns ± 8% +4.15% (p=0.006 n=20+20) QueryUnescape/#04-12 2.61µs ± 8% 2.70µs ± 7% +3.39% (p=0.009 n=20+20) PathUnescape/#00-12 74.6ns ± 6% 75.4ns ± 6% ~ (p=0.425 n=20+20) PathUnescape/#01-12 226ns ± 3% 227ns ± 8% ~ (p=0.453 n=15+20) PathUnescape/#02-12 202ns ±11% 202ns ± 6% ~ (p=0.963 n=20+20) PathUnescape/#03-12 484ns ± 9% 494ns ± 9% ~ (p=0.078 n=20+19) PathUnescape/#04-12 2.60µs ± 6% 2.61µs ± 8% ~ (p=0.776 n=20+19) Split-12 6.47ns ± 0% 6.47ns ± 0% ~ (p=0.760 n=18+18) name old alloc/op new alloc/op delta String-12 1.50kB ± 0% 1.50kB ± 0% ~ (all equal) ResolvePath-12 24.0B ± 0% 16.0B ± 0% -33.33% (p=0.000 n=20+20) QueryEscape/#00-12 8.00B ± 0% 8.00B ± 0% ~ (all equal) QueryEscape/#01-12 64.0B ± 0% 64.0B ± 0% ~ (all equal) QueryEscape/#02-12 32.0B ± 0% 32.0B ± 0% ~ (all equal) QueryEscape/#03-12 64.0B ± 0% 64.0B ± 0% ~ (all equal) QueryEscape/#04-12 832B ± 0% 832B ± 0% ~ (all equal) PathEscape/#00-12 16.0B ± 0% 16.0B ± 0% ~ (all equal) PathEscape/#01-12 64.0B ± 0% 64.0B ± 0% ~ (all equal) PathEscape/#02-12 32.0B ± 0% 32.0B ± 0% ~ (all equal) PathEscape/#03-12 64.0B ± 0% 64.0B ± 0% ~ (all equal) PathEscape/#04-12 704B ± 0% 704B ± 0% ~ (all equal) QueryUnescape/#00-12 8.00B ± 0% 8.00B ± 0% ~ (all equal) QueryUnescape/#01-12 24.0B ± 0% 24.0B ± 0% ~ (all equal) QueryUnescape/#02-12 24.0B ± 0% 24.0B ± 0% ~ (all equal) QueryUnescape/#03-12 64.0B ± 0% 64.0B ± 0% ~ (all equal) QueryUnescape/#04-12 320B ± 0% 320B ± 0% ~ (all equal) PathUnescape/#00-12 8.00B ± 0% 8.00B ± 0% ~ (all equal) PathUnescape/#01-12 24.0B ± 0% 24.0B ± 0% ~ (all equal) PathUnescape/#02-12 24.0B ± 0% 24.0B ± 0% ~ (all equal) PathUnescape/#03-12 64.0B ± 0% 64.0B ± 0% ~ (all equal) PathUnescape/#04-12 320B ± 0% 320B ± 0% ~ (all equal) name old allocs/op new allocs/op delta String-12 63.0 ± 0% 63.0 ± 0% ~ (all equal) ResolvePath-12 3.00 ± 0% 2.00 ± 0% -33.33% (p=0.000 n=20+20) QueryEscape/#00-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) QueryEscape/#01-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) QueryEscape/#02-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) QueryEscape/#03-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) QueryEscape/#04-12 2.00 ± 0% 2.00 ± 0% ~ (all equal) PathEscape/#00-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) PathEscape/#01-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) PathEscape/#02-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) PathEscape/#03-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) PathEscape/#04-12 2.00 ± 0% 2.00 ± 0% ~ (all equal) QueryUnescape/#00-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) QueryUnescape/#01-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) QueryUnescape/#02-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) QueryUnescape/#03-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) QueryUnescape/#04-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) PathUnescape/#00-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) PathUnescape/#01-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) PathUnescape/#02-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) PathUnescape/#03-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) PathUnescape/#04-12 1.00 ± 0% 1.00 ± 0% ~ (all equal) Fixes #43587 Change-Id: I66c47e78e92555180ce3554a2d4a21038362c41e Reviewed-on: https://go-review.googlesource.com/c/go/+/282673 Trust: Ian Lance Taylor <iant@golang.org> Trust: Daniel Martí <mvdan@mvdan.cc> Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
This commit is contained in:
Ian Lance Taylor
parent
62d424d794
commit
371ea545c0
@ -1015,6 +1015,8 @@ func resolvePath(base, ref string) string {
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)
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first := true
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remaining := full
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// We want to return a leading '/', so write it now.
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dst.WriteByte('/')
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for i >= 0 {
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i = strings.IndexByte(remaining, '/')
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if i < 0 {
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@ -1029,10 +1031,12 @@ func resolvePath(base, ref string) string {
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}
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if elem == ".." {
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str := dst.String()
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// Ignore the leading '/' we already wrote.
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str := dst.String()[1:]
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index := strings.LastIndexByte(str, '/')
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dst.Reset()
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dst.WriteByte('/')
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if index == -1 {
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first = true
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} else {
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@ -1051,7 +1055,12 @@ func resolvePath(base, ref string) string {
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dst.WriteByte('/')
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}
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return "/" + strings.TrimPrefix(dst.String(), "/")
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// We wrote an initial '/', but we don't want two.
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r := dst.String()
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if len(r) > 1 && r[1] == '/' {
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r = r[1:]
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}
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return r
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}
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// IsAbs reports whether the URL is absolute.
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