Calling a deferred function currently requires changing from a uintptr
to the function code to a Go function value. That is done by setting
the value of a func local variable using unsafe.Pointer. The local
variable will always be on the stack. Adjust the code that sets the
local variable to avoid generating a write barrier.
A write barrier is never needed here. Also, for deferreturn, we must
avoid write barriers entirely when called from a cgo function; that
requires more than just this, but this is a start.
The test for this is runtime tests that use the go tool; these are not
currently run, but they will be in the future.
Reviewed-on: https://go-review.googlesource.com/46455
From-SVN: r249559
-a459f1fdfe0bd365bf2def730e1529052c6487fd
+73b14da15ec731837ce2a45db658142bfbf5fe22
The first line of this file holds the git revision number of the last
merge done from the gofrontend repository.
// The gc compiler does this using assembler
// code in jmpdefer.
var fn func(unsafe.Pointer)
- *(**uintptr)(unsafe.Pointer(&fn)) = &pfn
+ *(*uintptr)(unsafe.Pointer(&fn)) = uintptr(unsafe.Pointer(&pfn))
fn(d.arg)
}
gp._defer = d.link
var fn func(unsafe.Pointer)
- *(**uintptr)(unsafe.Pointer(&fn)) = &pfn
+ *(*uintptr)(unsafe.Pointer(&fn)) = uintptr(unsafe.Pointer(&pfn))
fn(d.arg)
freedefer(d)
if pfn != 0 {
var fn func(unsafe.Pointer)
- *(**uintptr)(unsafe.Pointer(&fn)) = &pfn
+ *(*uintptr)(unsafe.Pointer(&fn)) = uintptr(unsafe.Pointer(&pfn))
fn(d.arg)
}
if pfn != 0 {
var fn func(unsafe.Pointer)
- *(**uintptr)(unsafe.Pointer(&fn)) = &pfn
+ *(*uintptr)(unsafe.Pointer(&fn)) = uintptr(unsafe.Pointer(&pfn))
fn(d.arg)
if p.recovered {