make sim local; start circuit compiler

sim/compile.lua

@@ -1,6 +1,44 @@
 
+local ffi = FFI or require("ffi")
+Simulation = Simulation or {}
+
+ffi.cdef([[
+	struct Net {
+		
+	};
+]])
+
 function Simulation.compile(sim)
+	-- assemble a list of all groups
+	local groups = {}
+	for wire_idx, wire in pairs(sim.wires) do
+		local group = Wire.getgroup(wire)
+		groups[group] = group
+	end
+	local num_groups = 0
+	for group_id, group in pairs(groups) do
+		num_groups = num_groups+1
+	end
 	
+	-- construct each gate into an array
+	
+	-- construct each group into an array
+	local group_idx = 0
+	local array_nets = ffi.new("struct Net["..num_groups.."]")
+	for group_id, group in pairs(groups) do
+		local c_net = ffi.new("struct Net")
+		
+		local ports_update = {}
+		for port_id, port in pairs(group.in_ports) do
+			if port.causeupdate then
+				num_ports_update = num
+			end
+		end
+		--c_net.ports_update = ffi.new("struct Port["..
+		
+		array_nets[group_idx] = c_net
+		group_idx = group_idx + 1
+	end
 end
 
 function Simulation.decompile(sim)