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| Filename | Latest commit message | Latest commit date |
|---|---|---|
dba926f240
The body of a range-over-func loop is compiled into a closure that the
iterator calls, so it runs in a frame of its own:
func foo() {
for range iter {
recover()
}
}
leaves the stack as
foo
runtime.gopanic
foo
iter
foo-range1
runtime.gorecover
The recover is written directly in foo, so it should recover, but the
runtime decides by the frame the call was made in, and that frame is the
body's, not foo's.
Whether such a call can recover depends only on the frame the loop is
in, so the runtime can decide that part on entry to the loop, while that
frame is the current one. rangeframe does that and returns the panic the
body may recover, and the body passes it back to gorecoverat, which
recovers it if it is still the one being processed:
var #recover = runtime.recoverrangefunc()
iter(func() {
runtime.gorecoverat(#recover)
})
This is the same shape as the token deferrangefunc hands out so that a
defer in the body defers to the containing function. A panic is a safe
token to hold onto, unlike the frame it stands for: it does not move
when the stack does, so nothing has to keep it up to date.
Fixes #71685
Change-Id: Iee454fcf757bd91828b9b1fe93076ca32456740e
Reviewed-on: https://go-review.googlesource.com/c/go/+/841045
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: David Chase <drchase@google.com>
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| SECURITY.md | ||
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