ssa: ChangeInterface

internal/runtime/z_face.go

@@ -198,6 +198,9 @@ func Interface(pkgPath, name string, methods []Imethod) *InterfaceType {
 
 // NewItab returns a new itab.
 func NewItab(inter *InterfaceType, typ *Type) *Itab {
+	if typ == nil {
+		return nil
+	}
 	n := len(inter.Methods)
 	size := itabHdrSize + uintptr(n)*pointerSize
 	ptr := AllocU(size)
@@ -246,7 +249,17 @@ func methods(u *abi.UncommonType, from string) []abi.Method {
 	return u.ExportedMethods()
 }
 
-func IfaceData(i iface) unsafe.Pointer {
+func IfaceType(i iface) *abi.Type {
+	if i.tab == nil {
+		return nil
+	}
+	return i.tab._type
+}
+
+func IfacePtrData(i iface) unsafe.Pointer {
+	if i.tab == nil {
+		panic(errorString("invalid memory address or nil pointer dereference").Error())
+	}
 	if i.tab._type.Kind_&abi.KindDirectIface != 0 {
 		return unsafe.Pointer(&i.data)
 	}