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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
55 lines
1.8 KiB
Go
55 lines
1.8 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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// @warning "unsound: main.reflectNewAt contains a 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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