added

vendor/github.com/glycerine/zygomys/zygo/address.go

@@ -0,0 +1,21 @@
+package zygo
+
+type Address struct {
+	function *SexpFunction
+	position int
+}
+
+func (a Address) IsStackElem() {}
+
+func (stack *Stack) PushAddr(function *SexpFunction, pc int) {
+	stack.Push(Address{function, pc})
+}
+
+func (stack *Stack) PopAddr() (*SexpFunction, int, error) {
+	elem, err := stack.Pop()
+	if err != nil {
+		return MissingFunction, 0, err
+	}
+	addr := elem.(Address)
+	return addr.function, addr.position, nil
+}