Hi,
I have the following:
package myf
func F1(x *int, ch chan bool) {
*x += 1
ch <- false
}
func F2() {
var x int
ch := make(chan bool) // or with buffer
go F1(&x, ch)
<-ch
}
I get this when I build with go 1.15.5 via go build -gcflags '-m -m' :
3:6: can inline F1 with cost 7 as: func(*int, chan bool) { *x += 1; ch <-
false }
8:6: cannot inline F2: unhandled op GO
3:9: x does not escape
3:17: ch does not escape
9:6: x escapes to heap:
9:6: flow: {heap} = &x:
9:6: from &x (address-of) at ./heap.go:11:8
9:6: from F1(&x, ch) (call parameter) at ./heap.go:11:7
9:6: moved to heap: x
So x is allocated on the heap and needs gc when F2() returns. I know F2()
will wait for F1() and passing &x is safe if it was local. So how can I
tell this to go compiler and avoid allocation/gc costs? Do we need a new
*go:local* directive to mark such variables?
Thanks..
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