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// +build ignore
package main
type I interface {
f()
}
type C int
func (*C) f() {}
type D struct{ ptr *int }
func (D) f() {}
type E struct{}
func (*E) f() {}
var a, b int
var unknown bool // defeat dead-code elimination
func interface1() {
var i interface{} = &a
var j interface{} = D{&b}
k := j
if unknown {
k = i
}
print(i) // @types *int
print(j) // @types D
print(k) // @types *int | D
print(i.(*int)) // @pointsto main.a
print(j.(*int)) // @pointsto
print(k.(*int)) // @pointsto main.a
print(i.(D).ptr) // @pointsto
print(j.(D).ptr) // @pointsto main.b
print(k.(D).ptr) // @pointsto main.b
}
func interface2() {
var i I = (*C)(&a)
var j I = D{&a}
k := j
if unknown {
k = i
}
print(i) // @types *C
print(j) // @types D
print(k) // @types *C | D
print(k) // @pointsto makeinterface:main.D | makeinterface:*main.C
k.f()
// @calls main.interface2 -> (*main.C).f
// @calls main.interface2 -> (main.D).f
print(i.(*C)) // @pointsto main.a
print(j.(D).ptr) // @pointsto main.a
print(k.(*C)) // @pointsto main.a
switch x := k.(type) {
case *C:
print(x) // @pointsto main.a
case D:
print(x.ptr) // @pointsto main.a
case *E:
print(x) // @pointsto
}
}
func interface3() {
// There should be no backflow of concrete types from the type-switch to x.
var x interface{} = 0
print(x) // @types int
switch x.(type) {
case int:
case string:
}
}
func interface4() {
var i interface{} = D{&a}
if unknown {
i = 123
}
print(i) // @types int | D
j := i.(I) // interface narrowing type-assertion
print(j) // @types D
print(j.(D).ptr) // @pointsto main.a
var l interface{} = j // interface widening assignment.
print(l) // @types D
print(l.(D).ptr) // @pointsto main.a
m := j.(interface{}) // interface widening type-assertion.
print(m) // @types D
print(m.(D).ptr) // @pointsto main.a
}
// Interface method calls and value flow:
type J interface {
f(*int) *int
}
type P struct {
x int
}
func (p *P) f(pi *int) *int {
print(p) // @pointsto p@i5p:6
print(pi) // @pointsto i@i5i:6
return &p.x
}
func interface5() {
var p P // @line i5p
var j J = &p
var i int // @line i5i
print(j.f(&i)) // @pointsto p.x@i5p:6
print(&i) // @pointsto i@i5i:6
print(j) // @pointsto makeinterface:*main.P
}
// @calls main.interface5 -> (*main.P).f
func interface6() {
f := I.f
print(f) // @pointsto (main.I).f$thunk
f(new(struct{ D }))
}
// @calls main.interface6 -> (main.I).f$thunk
// @calls (main.I).f$thunk -> (*struct{main.D}).f
func main() {
interface1()
interface2()
interface3()
interface4()
interface5()
interface6()
}
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