func (self *Gen) genCall(code *ir.Code, call *ast.CallExpr) *obj {
f := self.genExpr(code, call.Func) // evaluate the function first
if f == nil {
return nil
}
ft, isFunc := f.t.(*types.Func)
if !isFunc {
self.errorf(call.Token, "calling on a non-function")
return nil
}
if len(call.Args) != len(ft.Args) {
self.errorf(call.Token, "wrong number of arguments")
return nil
}
var args []*obj
for i, arg := range call.Args {
o := self.genExpr(code, arg)
if o == nil {
return nil
}
if !types.Equals(o.t, ft.Args[i]) {
self.errorf(call.Token, "wrong argument type")
return nil
}
args = append(args, o)
}
// TODO: push the ret first
ret := voidObj
for _, o := range args {
code.Push(o.o) // now we can push the stuff for call
}
code.Call(f.o)
var pops []ir.Obj
for _, o := range args {
pops = append(pops, o.o)
}
code.Pop(pops...)
return ret
}
