I can't help you with your specific question, but two procedural points.
First, while such a question is welcome in this group (golang-nuts), you
may reach an audience better able to answer it on the golang-dev
<https://groups.google.com/g/golang-dev> group, since it deals with the
internal details of the compiler. But I would also note that golang-dev
<https://groups.google.com/g/golang-dev> is in "Quiet Week"
<https://groups.google.com/g/golang-dev/c/onqurcX6pV8>, so will be less
active than normal.
However you proceed, I hope you get an answer.
On Sunday, June 27, 2021 at 10:57:17 PM UTC-4 cuiw...@gmail.com wrote:
> a defer call generate some code like:
>
> -
> - v42 (8) = StaticLECall <mem> {AuxCall{runtime.deferprocStack}}
> [8] v36 v41
> - v43 (8) = SelectN <mem> [0] v42
> - Defer v42 → b2 b3 (likely) (8)
>
>
> - b2: ← b1-
> -
> - v48 (7) = Copy <mem> v43
> - v49 (7) = VarKill <mem> {.autotmp_0} v48
> - v50 (9) = StaticLECall <mem> {AuxCall{runtime.deferreturn}} v49
> - v51 (9) = SelectN <mem> [0] v50
> - v52 (9) = MakeResult <mem> v51
> - Ret v52 (9)
>
>
> - b3: ← b1-
> -
> - v44 (8) = Copy <mem> v43
> - v45 (8) = StaticLECall <mem> {AuxCall{runtime.deferreturn}} v44
> - v46 (8) = SelectN <mem> [0] v45
> - v47 (8) = MakeResult <mem> v46
> - Ret v47 (8)
>
> my question is Under what circumstances the deferprocStack return 1?
> some useful info：
>
> https://github.com/golang/go/blob/master/src/cmd/compile/internal/amd64/ssa.go#L1287-L1289
>
> https://github.com/golang/go/blob/master/src/runtime/panic.go#L290-L328,
> in these lines it seems deferprocStack always return 0. i think i have miss
> some thing, please help me to find when it get to branch return 1.
>
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