I edited my code to import test/pri in test/pub:
pri/a.go:
package pri
import (
"fmt"
)
const (
Dummy = 1
)
func rua() int64 {
fmt.Println("rua in pri")
return int64(1)
}
pub/b.go:
package pub
import (
"unsafe"
pri "test/pri"
)
var _ = unsafe.Sizeof(0)
var _ = pri.Dummy
//go:noescape
//go:linkname rua pri.rua
func rua() int64
func Rua() int64 {
return rua()
}
But this still don't work.
# command-line-arguments
test/pub.Rua: pri.rua: not defined
test/pub.Rua: undefined: pri.rua
Besides, this package
<https://github.com/aristanetworks/goarista/blob/46272bfb1c042fc2825d312fe33d494e9d13dd6b/atime/nanotime.go>
doesn't
import "runtime" at all, but it can use "runtime.nanotime" in go:linkname.
在 2017年1月20日星期五 UTC+8下午1:34:43，Ian Lance Taylor写道：
>
> On Wed, Jan 18, 2017 at 6:55 PM, Cholerae Hu <[email protected]
> <javascript:>> wrote:
> > I'm trying to play with go:linkname, and I wrote a demo for this.
> >
> > directory structure:
> >
> > [test]$ tree
> > .
> > ├── main.go
> > ├── pri
> > │ └── a.go
> > └── pub
> > ├── issue15006.s
> > └── b.go
> >
> > a.go:
> >
> > package pri
> >
> >
> > import (
> > "fmt"
> > )
> > func rua() int64 {
> > fmt.Println("rua in pri")
> > return 1
> > }
> >
> > b.go:
> >
> > package pub
> >
> >
> > import (
> > "unsafe"
> > )
> >
> >
> > var _ = unsafe.Sizeof(0)
> >
> >
> > //go:noescape
> > //go:linkname rua test/pri.rua
> > func rua() int64
> >
> >
> > func Rua() int64 {
> > return rua()
> > }
> >
> > main.go:
> >
> > package main
> >
> >
> > import (
> > "test/pub"
> > )
> >
> >
> > func main() {
> > println(pub.Rua())
> > }
> >
> > issue15006.s is a workaround for issue 15006 and it's totally empty.
> >
> > Than I ran `go run main.go` and got an error:
> >
> > # command-line-arguments
> > test/pub.Rua: test/pri.rua: not defined
> > test/pub.Rua: undefined: test/pri.rua
> >
> > So what's wrong with this demo?
>
> Nothing in your program imports test/pri. go:linkname only changes
> the name used for a symbol. It doesn't cause a package to be
> imported.
>
> Ian
>
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