| commit | bdb480fd623e58d0d1d0689a3755367379ea57bc | [log] [tgz] |
|---|---|---|
| author | Cuong Manh Le <cuong.manhle.vn@gmail.com> | Tue Sep 08 15:28:43 2020 +0700 |
| committer | Cuong Manh Le <cuong.manhle.vn@gmail.com> | Wed Sep 09 07:50:01 2020 +0000 |
| tree | 4875cdbf806e7088be9a261cf61135bda02138e9 | |
| parent | 1e6ad65b43ee392676a69f769b1942edd8af0e86 [diff] |
cmd/compile: fix mishandling of unsafe-uintptr arguments in go/defer
Currently, the statement:
go g(uintptr(f()))
gets rewritten into:
tmp := f()
newproc(8, g, uintptr(tmp))
runtime.KeepAlive(tmp)
which doesn't guarantee that tmp is still alive by time the g call is
scheduled to run.
This CL fixes the issue, by wrapping g call in a closure:
go func(p unsafe.Pointer) {
g(uintptr(p))
}(f())
then this will be rewritten into:
tmp := f()
go func(p unsafe.Pointer) {
g(uintptr(p))
runtime.KeepAlive(p)
}(tmp)
runtime.KeepAlive(tmp) // superfluous, but harmless
So the unsafe.Pointer p will be kept alive at the time g call runs.
Updates #24491
Change-Id: Ic10821251cbb1b0073daec92b82a866c6ebaf567
Reviewed-on: https://go-review.googlesource.com/c/go/+/253457
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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