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runtime: refactor defer processing

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This CL refactors gopanic, Goexit, and deferreturn to share a common
state machine for processing pending defers. The new state machine
removes a lot of redundant code and does overall less work.

It should also make it easier to implement further optimizations
(e.g., TODOs added in this CL).

Change-Id: I71d3cc8878a6f951d8633505424a191536c8e6b3
Reviewed-on: https://go-review.googlesource.com/c/go/+/513837
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Matthew Dempsky 2023-07-27 16:20:36 -07:00
parent 6eaad824e5
commit 9eb1d5317b
5 changed files with 287 additions and 464 deletions
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3
src/runtime/stack.go
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@ -763,10 +763,7 @@ func adjustdefers(gp *g, adjinfo *adjustinfo) {
for d := gp._defer; d != nil; d = d.link {
adjustpointer(adjinfo, unsafe.Pointer(&d.fn))
adjustpointer(adjinfo, unsafe.Pointer(&d.sp))
adjustpointer(adjinfo, unsafe.Pointer(&d._panic))
adjustpointer(adjinfo, unsafe.Pointer(&d.link))
adjustpointer(adjinfo, unsafe.Pointer(&d.varp))
adjustpointer(adjinfo, unsafe.Pointer(&d.fd))
}
}