86 lines
2.5 KiB
Go
86 lines
2.5 KiB
Go
// +build ignore
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package main
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import "reflect"
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// Test of channels with reflection.
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var a, b int
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func chanreflect1() {
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ch := make(chan *int, 0) // @line cr1make
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crv := reflect.ValueOf(ch)
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crv.Send(reflect.ValueOf(&a))
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print(crv.Interface()) // @types chan *int
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print(crv.Interface().(chan *int)) // @pointsto makechan@cr1make:12
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print(<-ch) // @pointsto main.a
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}
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func chanreflect1i() {
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// Exercises reflect.Value conversions to/from interfaces:
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// a different code path than for concrete types.
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ch := make(chan interface{}, 0)
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reflect.ValueOf(ch).Send(reflect.ValueOf(&a))
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v := <-ch
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print(v) // @types *int
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print(v.(*int)) // @pointsto main.a
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}
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func chanreflect2() {
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ch := make(chan *int, 0)
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ch <- &b
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crv := reflect.ValueOf(ch)
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r, _ := crv.Recv()
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print(r.Interface()) // @types *int
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print(r.Interface().(*int)) // @pointsto main.b
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}
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func chanOfRecv() {
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// MakeChan(<-chan) is a no-op.
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t := reflect.ChanOf(reflect.RecvDir, reflect.TypeOf(&a))
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print(reflect.Zero(t).Interface()) // @types <-chan *int
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print(reflect.MakeChan(t, 0).Interface().(<-chan *int)) // @pointsto
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print(reflect.MakeChan(t, 0).Interface().(chan *int)) // @pointsto
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}
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func chanOfSend() {
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// MakeChan(chan<-) is a no-op.
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t := reflect.ChanOf(reflect.SendDir, reflect.TypeOf(&a))
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print(reflect.Zero(t).Interface()) // @types chan<- *int
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print(reflect.MakeChan(t, 0).Interface().(chan<- *int)) // @pointsto
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print(reflect.MakeChan(t, 0).Interface().(chan *int)) // @pointsto
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}
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func chanOfBoth() {
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t := reflect.ChanOf(reflect.BothDir, reflect.TypeOf(&a))
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print(reflect.Zero(t).Interface()) // @types chan *int
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ch := reflect.MakeChan(t, 0)
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print(ch.Interface().(chan *int)) // @pointsto <alloc in reflect.MakeChan>
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ch.Send(reflect.ValueOf(&b))
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ch.Interface().(chan *int) <- &a
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r, _ := ch.Recv()
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print(r.Interface().(*int)) // @pointsto main.a | main.b
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print(<-ch.Interface().(chan *int)) // @pointsto main.a | main.b
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}
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var unknownDir reflect.ChanDir // not a constant
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func chanOfUnknown() {
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// Unknown channel direction: assume all three.
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// MakeChan only works on the bi-di channel type.
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t := reflect.ChanOf(unknownDir, reflect.TypeOf(&a))
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print(reflect.Zero(t).Interface()) // @types <-chan *int | chan<- *int | chan *int
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print(reflect.MakeChan(t, 0).Interface()) // @types chan *int
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}
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func main() {
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chanreflect1()
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chanreflect1i()
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chanreflect2()
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chanOfRecv()
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chanOfSend()
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chanOfBoth()
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chanOfUnknown()
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}
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