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debug/gosym: bulk allocate Syms

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name                old time/op    new time/op    delta
115/NewLineTable-8    80.7ns ± 1%    81.7ns ± 3%     ~     (p=0.408 n=10+8)
115/NewTable-8        76.3µs ± 2%    63.3µs ± 3%  -17.03%  (p=0.000 n=9+9)
115/LineToPC-8        56.8µs ± 2%    56.8µs ± 3%     ~     (p=0.905 n=10+9)
115/PCToLine-8         252ns ± 1%     256ns ± 5%     ~     (p=0.183 n=10+10)

name                old alloc/op   new alloc/op   delta
115/NewLineTable-8      384B ± 0%      384B ± 0%     ~     (all equal)
115/NewTable-8         164kB ± 0%     172kB ± 0%   +4.97%  (p=0.000 n=10+10)
115/LineToPC-8         0.00B          0.00B          ~     (all equal)
115/PCToLine-8         0.00B          0.00B          ~     (all equal)

name                old allocs/op  new allocs/op  delta
115/NewLineTable-8      3.00 ± 0%      3.00 ± 0%     ~     (all equal)
115/NewTable-8         1.04k ± 0%     0.01k ± 0%  -98.75%  (p=0.000 n=10+10)
115/LineToPC-8          0.00           0.00          ~     (all equal)
115/PCToLine-8          0.00           0.00          ~     (all equal)

Change-Id: Ibfe6c0cb86737dee8209cb1f58f5b796aa7b30aa
Reviewed-on: https://go-review.googlesource.com/c/go/+/353134
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2021-10-06 12:40:35 -07:00
parent 629ffebd45
commit f7a95d2c17
1 changed files with 3 additions and 1 deletions
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4
src/debug/gosym/pclntab.go
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@ -297,6 +297,7 @@ func (t *LineTable) go12Funcs() []Func {
ft := t.funcTab()
funcs := make([]Func, ft.Count())
syms := make([]Sym, len(funcs))
for i := range funcs {
f := &funcs[i]
f.Entry = ft.pc(i)
@ -304,13 +305,14 @@ func (t *LineTable) go12Funcs() []Func {
info := t.funcData(uint32(i))
f.LineTable = t
f.FrameSize = int(info.deferreturn())
f.Sym = &Sym{
syms[i] = Sym{
Value: f.Entry,
Type: 'T',
Name: t.funcName(info.nameoff()),
GoType: 0,
Func: f,
}
f.Sym = &syms[i]
}
return funcs
}