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[dev.regabi] cmd/compile: simplify dwarfgen.declPos

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The previous code was way overcomplicating things. To find out if a
variable is a closure pseudo-variable, one only needs to check
IsClosureVar. Checking Captured and Byval are only meant to be used by
closure conversion.

Passes toolstash -cmp.

Change-Id: I22622cba36ba7f60b3275d17999a8b6bb7c6719a
Reviewed-on: https://go-review.googlesource.com/c/go/+/280995
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Matthew Dempsky 2021-01-01 02:23:48 -08:00
parent 9ed1577779
commit 7d55669847
1 changed files with 2 additions and 16 deletions
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18
src/cmd/compile/internal/dwarfgen/dwarf.go
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@ -127,22 +127,8 @@ func Info(fnsym *obj.LSym, infosym *obj.LSym, curfn interface{}) ([]dwarf.Scope,
}
func declPos(decl *ir.Name) src.XPos {
if decl.Defn != nil && (decl.Captured() || decl.Byval()) {
// It's not clear which position is correct for captured variables here:
// * decl.Pos is the wrong position for captured variables, in the inner
// function, but it is the right position in the outer function.
// * decl.Name.Defn is nil for captured variables that were arguments
// on the outer function, however the decl.Pos for those seems to be
// correct.
// * decl.Name.Defn is the "wrong" thing for variables declared in the
// header of a type switch, it's their position in the header, rather
// than the position of the case statement. In principle this is the
// right thing, but here we prefer the latter because it makes each
// instance of the header variable local to the lexical block of its
// case statement.
// This code is probably wrong for type switch variables that are also
// captured.
return decl.Defn.Pos()
if decl.IsClosureVar() {
decl = decl.Defn.(*ir.Name)
}
return decl.Pos()
}