mirror of
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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
57 lines
1.9 KiB
Go
57 lines
1.9 KiB
Go
// +build ignore
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package main
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import "reflect"
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import "unsafe"
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var a, b int
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var unknown bool
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func reflectIndirect() {
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ptr := &a
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// Pointer:
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print(reflect.Indirect(reflect.ValueOf(&ptr)).Interface().(*int)) // @pointsto main.a
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// Non-pointer:
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print(reflect.Indirect(reflect.ValueOf([]*int{ptr})).Interface().([]*int)[0]) // @pointsto main.a
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}
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func reflectNewAt() {
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var x [8]byte
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print(reflect.NewAt(reflect.TypeOf(3), unsafe.Pointer(&x)).Interface()) // @types *int
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}
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// TODO(adonovan): report the location of the caller, not NewAt.
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// #warning "unsound: main.reflectNewAt contains a reflect.NewAt.. call"
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// @warning "unsound: reflect.NewAt.. call"
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func reflectTypeOf() {
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t := reflect.TypeOf(3)
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if unknown {
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t = reflect.TypeOf("foo")
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}
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// TODO(adonovan): make types.Eval let us refer to unexported types.
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print(t) // #@types *reflect.rtype
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print(reflect.Zero(t).Interface()) // @types int | string
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newint := reflect.New(t).Interface() // @line rtonew
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print(newint) // @types *int | *string
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print(newint.(*int)) // @pointsto <alloc in reflect.New>
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print(newint.(*string)) // @pointsto <alloc in reflect.New>
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}
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func reflectTypeElem() {
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print(reflect.Zero(reflect.TypeOf(&a).Elem()).Interface()) // @types int
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print(reflect.Zero(reflect.TypeOf([]string{}).Elem()).Interface()) // @types string
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print(reflect.Zero(reflect.TypeOf(make(chan bool)).Elem()).Interface()) // @types bool
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print(reflect.Zero(reflect.TypeOf(make(map[string]float64)).Elem()).Interface()) // @types float64
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print(reflect.Zero(reflect.TypeOf([3]complex64{}).Elem()).Interface()) // @types complex64
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print(reflect.Zero(reflect.TypeOf(3).Elem()).Interface()) // @types
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}
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func main() {
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reflectIndirect()
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reflectNewAt()
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reflectTypeOf()
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reflectTypeElem()
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}
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