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3371b79a96
(reflect.Value).Send
(reflect.Value).TrySend
(reflect.Value).Recv
(reflect.Value).TryRecv
(reflect.Type).ChanOf
(reflect.Type).In
(reflect.Type).Out
reflect.Indirect
reflect.MakeChan
Also:
- specialize genInvoke when the receiver is a reflect.Type under the
assumption that there's only one possible concrete type. This
makes all reflect.Type operations context-sensitive since the calls
are no longer dynamic.
- Rename all variables to match the actual parameter names used in
the reflect API.
- Add pointer.Config.Reflection flag
(exposed in oracle as --reflect, default false) to enable reflection.
It currently adds about 20% running time. I'll make it true after
the presolver is implemented.
- Simplified worklist datatype and solver main loop slightly
(~10% speed improvement).
- Use addLabel() utility to add a label to a PTS.
(Working on my 3 yr old 2x2GHz+4GB Mac vs 8x4GHz+24GB workstation,
one really notices the cost of pointer analysis.
Note to self: time to implement presolver.)
R=crawshaw
CC=golang-dev
https://golang.org/cl/13242062
79 lines
2.5 KiB
Go
79 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 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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// TODO(adonovan): the analysis can't yet take advantage of the
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// ChanOf(dir) parameter so the results are less precise than they
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// should be: all three directions are returned.
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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 | chan<- *int | 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 <alloc in reflect.MakeChan>
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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 | chan<- *int | 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 <alloc in reflect.MakeChan>
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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 | chan<- *int | 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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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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