On Thu, Apr 13, 2017 at 10:45 PM, 刘桂祥 <liuguixiang...@gmail.com> wrote:
> go1.7.1
>
> go run -gcflags '-N -l -m' example.go
It is the -m flag that is generating the output you see.
If there is some other bug, please let us know what it is.
Ian
> 在 2017年4月14日星期五 UTC+8下午1:18:26，Ian Lance Taylor写道：
>>
>> On Thu, Apr 13, 2017 at 8:33 PM, 刘桂祥 <liuguix...@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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