func (tc *typechecker) resolve(obj *ast.Object) {
// check for declaration cycles
if tc.cyclemap[obj] {
tc.Errorf(obj.Pos(), "illegal cycle in declaration of %s", obj.Name)
obj.Kind = ast.Bad
return
}
tc.cyclemap[obj] = true
defer func() {
delete(tc.cyclemap, obj)
}()
// resolve non-type objects
typ, _ := obj.Type.(*Type)
if typ == nil {
switch obj.Kind {
case ast.Bad:
// ignore
case ast.Con:
tc.declConst(obj)
case ast.Var:
tc.declVar(obj)
obj.Type = tc.typeFor(nil, obj.Decl.(*ast.ValueSpec).Type, false)
case ast.Fun:
obj.Type = NewType(Function)
t := obj.Decl.(*ast.FuncDecl).Type
tc.declSignature(obj.Type.(*Type), nil, t.Params, t.Results)
default:
// type objects have non-nil types when resolve is called
if debug {
fmt.Printf("kind = %s\n", obj.Kind)
}
panic("unreachable")
}
return
}
// resolve type objects
if typ.Form == Unresolved {
tc.typeFor(typ, typ.Obj.Decl.(*ast.TypeSpec).Type, false)
// provide types for all methods
for _, obj := range typ.Scope.Objects {
if obj.Kind == ast.Fun {
assert(obj.Type == nil)
obj.Type = NewType(Method)
f := obj.Decl.(*ast.FuncDecl)
t := f.Type
tc.declSignature(obj.Type.(*Type), f.Recv, t.Params, t.Results)
}
}
}
}
// checkObj type checks an object.
func (c *checker) checkObj(obj *ast.Object, ref bool) {
if obj.Type != nil {
// object has already been type checked
return
}
switch obj.Kind {
case ast.Bad:
// ignore
case ast.Con:
// TODO(gri) complete this
case ast.Typ:
typ := &Name{Obj: obj}
obj.Type = typ // "mark" object so recursion terminates
typ.Underlying = Underlying(c.makeType(obj.Decl.(*ast.TypeSpec).Type, ref))
case ast.Var:
// TODO(gri) complete this
case ast.Fun:
// TODO(gri) complete this
default:
panic("unreachable")
}
}