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cmd/compile: fix bug in DWARF inl handling of unused autos

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The DWARF inline info generation hooks weren't properly
handling unused auto vars in certain cases, triggering an assert (now
fixed). Also with this change, introduce a new autom "flavor" to
use for autom entries that are added to insure that a specific
auto type makes it into the linker (this is a follow-on to the fix
for 22941).

Fixes #22962.

Change-Id: I7a2d8caf47f6ca897b12acb6a6de0eb25f5cac8f
Reviewed-on: https://go-review.googlesource.com/81557
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Than McIntosh 2017-12-01 15:23:30 -05:00
parent 03c93eaa0b
commit 88c2fb9d04
9 changed files with 52 additions and 7 deletions
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2
src/cmd/internal/obj/objfile.go
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@ -351,6 +351,8 @@ func (w *objWriter) writeSym(s *LSym) {
w.writeInt(objabi.A_AUTO)
} else if a.Name == NAME_PARAM {
w.writeInt(objabi.A_PARAM)
} else if a.Name == NAME_DELETED_AUTO {
w.writeInt(objabi.A_DELETED_AUTO)
} else {
log.Fatalf("%s: invalid local variable type %d", s.Name, a.Name)
}