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[dev.typeparams] runtime: simplify freedefer

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Currently, freedefer manually zeros all the fields in the _defer
because simply assigning _defer{} used to cause a nosplit stack
overflow. freedefer is no longer nosplit, so go back to the simpler,
more robust code.

Change-Id: I881f557bab3b1ee7ab29b68e7fb56d0fe6d35d8d
Reviewed-on: https://go-review.googlesource.com/c/go/+/339669
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Austin Clements 2021-08-03 17:03:42 -04:00
parent 1a0630aef4
commit 88bd92bb6d
1 changed files with 1 additions and 13 deletions
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14
src/runtime/panic.go
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@ -372,19 +372,7 @@ func freedefer(d *_defer) {
unlock(&sched.deferlock)
}
// These lines used to be simply `*d = _defer{}` but that
// started causing a nosplit stack overflow via typedmemmove.
d.started = false
d.openDefer = false
d.sp = 0
d.pc = 0
d.framepc = 0
d.varp = 0
d.fd = nil
// d._panic and d.fn must be nil already.
// If not, we would have called freedeferpanic or freedeferfn above,
// both of which throw.
d.link = nil
*d = _defer{}
pp.deferpool = append(pp.deferpool, d)