On Thu, Apr 13, 2017 at 8:33 PM, 刘桂祥 <liuguixiang...@gmail.com> wrote:
> // example.go
> package main
>
>
> import "runtime"
>
>
> type S struct{}
>
>
> func main() {
> var stats runtime.MemStats
>
>
> runtime.ReadMemStats(&stats)
> println(stats.Mallocs)
> var x S
> runtime.ReadMemStats(&stats)
> println(stats.Mallocs)
> _ = *ref(x)
> runtime.ReadMemStats(&stats)
> println(stats.Mallocs)
> }
>
>
> func ref(z S) *S {
> return &z
> }
>
> go build -gcflags '-N -l' example.go && ./example
> or
> go run -gcflags '-N -l' example.go
>
> results:
> ./example.go:21: &z escapes to heap
> ./example.go:20: moved to heap: z
> ./example.go:10: main &stats does not escape
> ./example.go:13: main &stats does not escape
> ./example.go:16: main &stats does not escape
> 61
> 61
> 61
That looks like the output from -gcflags="-m -l". Are you really sure
you typed -N? What version of Go are you using?
Ian
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