118 lines
3.7 KiB
Go
118 lines
3.7 KiB
Go
// +build ignore
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package main
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// Test of maps with reflection.
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import "reflect"
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var a int
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var b bool
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func reflectMapKeysIndex() {
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m := make(map[*int]*bool) // @line mr1make
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m[&a] = &b
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mrv := reflect.ValueOf(m)
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print(mrv.Interface()) // @types map[*int]*bool
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print(mrv.Interface().(map[*int]*bool)) // @pointsto makemap@mr1make:11
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print(mrv) // @pointsto makeinterface:map[*int]*bool
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print(mrv) // @types map[*int]*bool
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keys := mrv.MapKeys()
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print(keys) // @pointsto <alloc in (reflect.Value).MapKeys>
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for _, k := range keys {
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print(k) // @pointsto <alloc in (reflect.Value).MapKeys>
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print(k) // @types *int
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print(k.Interface()) // @types *int
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print(k.Interface().(*int)) // @pointsto main.a
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v := mrv.MapIndex(k)
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print(v.Interface()) // @types *bool
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print(v.Interface().(*bool)) // @pointsto main.b
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}
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}
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func reflectSetMapIndex() {
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m := make(map[*int]*bool)
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mrv := reflect.ValueOf(m)
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mrv.SetMapIndex(reflect.ValueOf(&a), reflect.ValueOf(&b))
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print(m[nil]) // @pointsto main.b
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for _, k := range mrv.MapKeys() {
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print(k.Interface()) // @types *int
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print(k.Interface().(*int)) // @pointsto main.a
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}
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tmap := reflect.TypeOf(m)
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// types.EvalNode won't let us refer to non-exported types:
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// print(tmap) // #@types *reflect.rtype
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print(tmap) // @pointsto map[*int]*bool
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zmap := reflect.Zero(tmap)
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print(zmap) // @pointsto <alloc in reflect.Zero>
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print(zmap.Interface()) // @pointsto <alloc in reflect.Zero>
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print(tmap.Key()) // @pointsto *int
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print(tmap.Elem()) // @pointsto *bool
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print(reflect.Zero(tmap.Key())) // @pointsto <alloc in reflect.Zero>
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print(reflect.Zero(tmap.Key()).Interface()) // @pointsto <alloc in reflect.Zero>
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print(reflect.Zero(tmap.Key()).Interface()) // @types *int
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print(reflect.Zero(tmap.Elem())) // @pointsto <alloc in reflect.Zero>
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print(reflect.Zero(tmap.Elem()).Interface()) // @pointsto <alloc in reflect.Zero>
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print(reflect.Zero(tmap.Elem()).Interface()) // @types *bool
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}
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func reflectSetMapIndexInterface() {
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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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m := make(map[interface{}]interface{})
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reflect.ValueOf(m).SetMapIndex(reflect.ValueOf(&a), reflect.ValueOf(&b))
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for k, v := range m {
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print(k) // @types *int
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print(k.(*int)) // @pointsto main.a
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print(v) // @types *bool
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print(v.(*bool)) // @pointsto main.b
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}
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}
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func reflectSetMapIndexAssignable() {
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// SetMapIndex performs implicit assignability conversions.
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type I *int
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type J *int
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str := reflect.ValueOf("")
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// *int is assignable to I.
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m1 := make(map[string]I)
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reflect.ValueOf(m1).SetMapIndex(str, reflect.ValueOf(new(int))) // @line int
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print(m1[""]) // @pointsto new@int:58
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// I is assignable to I.
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m2 := make(map[string]I)
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reflect.ValueOf(m2).SetMapIndex(str, reflect.ValueOf(I(new(int)))) // @line I
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print(m2[""]) // @pointsto new@I:60
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// J is not assignable to I.
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m3 := make(map[string]I)
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reflect.ValueOf(m3).SetMapIndex(str, reflect.ValueOf(J(new(int))))
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print(m3[""]) // @pointsto
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}
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func reflectMakeMap() {
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t := reflect.TypeOf(map[*int]*bool(nil))
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v := reflect.MakeMap(t)
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print(v) // @types map[*int]*bool
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print(v) // @pointsto <alloc in reflect.MakeMap>
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}
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func main() {
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reflectMapKeysIndex()
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reflectSetMapIndex()
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reflectSetMapIndexInterface()
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reflectSetMapIndexAssignable()
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reflectMakeMap()
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// TODO(adonovan): reflect.MapOf(Type)
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}
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