remove gate ffi struct

sim/gate.lua

@@ -3,21 +3,11 @@ local ffi = FFI or require("ffi")
 
 Gate = {}
 
-ffi.cdef [[
-	struct OutPort {
-		struct Net* net;
-		int state;
-	};
-	struct Gate {
-		int in_queue;
-		struct OutPort ports[0];
-	};
-]]
-
 function Gate.new(objref, definition)
 	local gate = {
 		-- Logic Critical
-		c = nil,
+		in_queue = ffi.new("int"),
+		port_states = ffi.new("int["..(#definition.ports+1).."]"),
 		logic = definition.logic,
 		ports = {},
 		port_nets = {},
@@ -25,23 +15,20 @@ function Gate.new(objref, definition)
 		objref = objref,
 		definition = definition,
 	}
-	local cdata = ffi.new("char["..(ffi.sizeof("struct Gate") + ffi.sizeof("struct OutPort")*(#definition.ports+1)).."]")
-	gate.c = ffi.cast("struct Gate*", cdata)
-	gate.c.in_queue = 0
 	return gate
 end
 
 -- Logic Critical
 function Gate.getportstate(gate, index)
-	return gate.c.ports[index].state
+	return gate.port_states[index]
 end
 
 -- Logic Critical
 function Gate.setportstate(gate, index, state)
-	if state ~= gate.c.ports[index].state then
+	if state ~= gate.port_states[index] then
 		local group = gate.port_nets[index]
-		group.state_num = group.state_num - gate.c.ports[index].state + state
-		gate.c.ports[index].state = state
+		group.state_num = group.state_num - gate.port_states[index] + state
+		gate.ports_states[index] = state
 		
 		if ((group.state_num>0) ~= (group.state==1)) and (group.in_queue==0) then
 			Simulation.queuegroup(GSim, group)