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cmd/internal/obj: cache dwarfSym

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Follow-up to review feedback from
mdempsky on CL 40507.

Reduces mutex contention by about 1%.

Change-Id: I540ea6772925f4a59e58f55a3458eff15880c328
Reviewed-on: https://go-review.googlesource.com/40575
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2017-04-13 08:00:09 -07:00
parent adc80c0665
commit 7b5f94e76c
2 changed files with 10 additions and 6 deletions
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11
src/cmd/internal/obj/link.go
View File

@ -324,11 +324,12 @@ type LSym struct {
// A FuncInfo contains extra fields for STEXT symbols.
type FuncInfo struct {
Args int32
Locals int32
Text *Prog
Autom []*Auto
Pcln Pcln
Args int32
Locals int32
Text *Prog
Autom []*Auto
Pcln Pcln
dwarfSym *LSym
}
// Attribute is a set of symbol attributes.

5
src/cmd/internal/obj/objfile.go
View File

@ -560,7 +560,10 @@ func (ctxt *Link) dwarfSym(s *LSym) *LSym {
if s.Type != STEXT {
ctxt.Diag("dwarfSym of non-TEXT %v", s)
}
return ctxt.Lookup(dwarf.InfoPrefix+s.Name, int(s.Version))
if s.FuncInfo.dwarfSym == nil {
s.FuncInfo.dwarfSym = ctxt.Lookup(dwarf.InfoPrefix+s.Name, int(s.Version))
}
return s.FuncInfo.dwarfSym
}
// populateDWARF fills in the DWARF Debugging Information Entry for TEXT symbol s.