109 lines
3.0 KiB
Go
109 lines
3.0 KiB
Go
// +build ignore
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package main
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import "reflect"
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// Test of arrays & slices with reflection.
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var a int
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func arrayreflect1() {
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sl := make([]*int, 10) // @line ar1make
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sl[0] = &a
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srv := reflect.ValueOf(sl).Slice(0, 0)
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print(srv.Interface()) // @types []*int
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print(srv.Interface().([]*int)) // @pointsto makeslice@ar1make:12
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print(srv.Interface().([]*int)[42]) // @pointsto main.a
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}
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func arrayreflect2() {
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var arr [10]*int
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sl := arr[:]
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sl[0] = &a
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srv := reflect.ValueOf(sl).Slice(0, 0)
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print(srv.Interface()) // @types []*int
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print(srv.Interface().([]*int)) // pointsto TODO
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print(srv.Interface().([]*int)[42]) // @pointsto main.a
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}
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func arrayreflect3() {
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srv := reflect.ValueOf("hi").Slice(0, 0)
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print(srv.Interface()) // @types string
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type S string
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srv2 := reflect.ValueOf(S("hi")).Slice(0, 0)
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print(srv2.Interface()) // @types main.S
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}
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func arrayreflect4() {
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rv1 := reflect.ValueOf("hi")
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rv2 := rv1 // backflow!
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if unknown {
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rv2 = reflect.ValueOf(123)
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}
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// We see backflow through the assignment above causing an
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// imprecise result for rv1. This is because the SSA builder
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// doesn't yet lift structs (like reflect.Value) into
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// registers so these are all loads/stores to the stack.
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// Under Das's algorithm, the extra indirection results in
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// (undirected) unification not (directed) flow edges.
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// TODO(adonovan): precision: lift aggregates.
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print(rv1.Interface()) // @types string | int
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print(rv2.Interface()) // @types string | int
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}
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func arrayreflect5() {
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sl1 := make([]byte, 0)
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sl2 := make([]byte, 0)
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srv := reflect.ValueOf(sl1)
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print(srv.Interface()) // @types []byte
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print(srv.Interface().([]byte)) // @pointsto makeslice@testdata/arrayreflect.go:62:13
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print(srv.Bytes()) // @pointsto makeslice@testdata/arrayreflect.go:62:13
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srv2 := reflect.ValueOf(123)
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srv2.SetBytes(sl2)
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print(srv2.Interface()) // @types []byte | int
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print(srv2.Interface().([]byte)) // @pointsto makeslice@testdata/arrayreflect.go:63:13
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print(srv2.Bytes()) // @pointsto makeslice@testdata/arrayreflect.go:63:13
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}
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func arrayreflect6() {
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sl1 := []*bool{new(bool)}
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sl2 := []*int{&a}
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srv1 := reflect.ValueOf(sl1)
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print(srv1.Index(42).Interface()) // @types *bool
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print(srv1.Index(42).Interface().(*bool)) // @pointsto alloc@testdata/arrayreflect.go:79:20
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srv2 := reflect.ValueOf(sl2)
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print(srv2.Index(42).Interface()) // @types *int
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print(srv2.Index(42).Interface().(*int)) // @pointsto main.a
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p1 := &sl1[0]
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p2 := &sl2[0]
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prv1 := reflect.ValueOf(p1)
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print(prv1.Elem().Interface()) // @types *bool
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print(prv1.Elem().Interface().(*bool)) // @pointsto alloc@testdata/arrayreflect.go:79:20
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prv2 := reflect.ValueOf(p2)
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print(prv2.Elem().Interface()) // @types *int
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print(prv2.Elem().Interface().(*int)) // @pointsto main.a
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}
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func main() {
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arrayreflect1()
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arrayreflect2()
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arrayreflect3()
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arrayreflect4()
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arrayreflect5()
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arrayreflect6()
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}
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var unknown bool
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