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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