start adding c structs for gates and ports

sim/gate.lua

@@ -1,6 +1,14 @@
 
 Gate = {}
 
+FFI.cdef[[
+	struct Gate {
+		int objref;
+		int definition_objref;
+		struct Port ports[1];
+	};
+]]
+
 function Gate.new(self, objref, definition, sim)
 	local o = {
 		objref = objref,
@@ -57,3 +65,21 @@ end
 function Gate.getsim(gate)
 	return gate.sim
 end
+
+function Gate.getdefinition(gate)
+	return gate.definition
+end
+
+-- Logic functions
+
+function Gate.init(gate)
+	Gate.getdefinition(gate).init(gate)
+end
+
+function Gate.logic(gate)
+	Gate.getdefinition(gate).logic(gate)
+end
+
+function Gate.input(gate, argv)
+	Gate.getdefinition(gate).input(gate, argv)
+end