mirror of
https://github.com/golang/go
synced 2024-11-19 09:34:52 -07:00
2299ac6bf3
This information can be used to specialize such calls, e.g. - report location of unsound calls (done for reflect.NewAt) - exploit argument information (done for constant 'dir' parameter to reflect.ChanOf) + tests. R=crawshaw CC=golang-dev https://golang.org/cl/14517046
75 lines
2.2 KiB
Go
75 lines
2.2 KiB
Go
// +build ignore
|
|
|
|
package main
|
|
|
|
import "reflect"
|
|
|
|
// Test of channels with reflection.
|
|
|
|
var a, b int
|
|
|
|
func chanreflect1() {
|
|
ch := make(chan *int, 0) // @line cr1make
|
|
crv := reflect.ValueOf(ch)
|
|
crv.Send(reflect.ValueOf(&a))
|
|
print(crv.Interface()) // @types chan *int
|
|
print(crv.Interface().(chan *int)) // @pointsto makechan@cr1make:12
|
|
print(<-ch) // @pointsto main.a
|
|
}
|
|
|
|
func chanreflect2() {
|
|
ch := make(chan *int, 0)
|
|
ch <- &b
|
|
crv := reflect.ValueOf(ch)
|
|
r, _ := crv.Recv()
|
|
print(r.Interface()) // @types *int
|
|
print(r.Interface().(*int)) // @pointsto main.b
|
|
}
|
|
|
|
func chanOfRecv() {
|
|
// MakeChan(<-chan) is a no-op.
|
|
t := reflect.ChanOf(reflect.RecvDir, reflect.TypeOf(&a))
|
|
print(reflect.Zero(t).Interface()) // @types <-chan *int
|
|
print(reflect.MakeChan(t, 0).Interface().(<-chan *int)) // @pointsto
|
|
print(reflect.MakeChan(t, 0).Interface().(chan *int)) // @pointsto
|
|
}
|
|
|
|
func chanOfSend() {
|
|
// MakeChan(chan<-) is a no-op.
|
|
t := reflect.ChanOf(reflect.SendDir, reflect.TypeOf(&a))
|
|
print(reflect.Zero(t).Interface()) // @types chan<- *int
|
|
print(reflect.MakeChan(t, 0).Interface().(chan<- *int)) // @pointsto
|
|
print(reflect.MakeChan(t, 0).Interface().(chan *int)) // @pointsto
|
|
}
|
|
|
|
func chanOfBoth() {
|
|
t := reflect.ChanOf(reflect.BothDir, reflect.TypeOf(&a))
|
|
print(reflect.Zero(t).Interface()) // @types chan *int
|
|
ch := reflect.MakeChan(t, 0)
|
|
print(ch.Interface().(chan *int)) // @pointsto <alloc in reflect.MakeChan>
|
|
ch.Send(reflect.ValueOf(&b))
|
|
ch.Interface().(chan *int) <- &a
|
|
r, _ := ch.Recv()
|
|
print(r.Interface().(*int)) // @pointsto main.a | main.b
|
|
print(<-ch.Interface().(chan *int)) // @pointsto main.a | main.b
|
|
}
|
|
|
|
var unknownDir reflect.ChanDir // not a constant
|
|
|
|
func chanOfUnknown() {
|
|
// Unknown channel direction: assume all three.
|
|
// MakeChan only works on the bi-di channel type.
|
|
t := reflect.ChanOf(unknownDir, reflect.TypeOf(&a))
|
|
print(reflect.Zero(t).Interface()) // @types <-chan *int | chan<- *int | chan *int
|
|
print(reflect.MakeChan(t, 0).Interface()) // @types chan *int
|
|
}
|
|
|
|
func main() {
|
|
chanreflect1()
|
|
chanreflect2()
|
|
chanOfRecv()
|
|
chanOfSend()
|
|
chanOfBoth()
|
|
chanOfUnknown()
|
|
}
|