1 files changed, 42 insertions, 0 deletions
diff --git a/cpu/netlist_ast.ml b/cpu/netlist_ast.ml
new file mode 100644
index 0000000..1866ed3
--- /dev/null
+++ b/cpu/netlist_ast.ml
@@ -0,0 +1,42 @@
+type ident = string
+
+module Env = struct
+  include Map.Make(struct
+    type t = ident
+    let compare = compare
+  end)
+
+  let of_list l =
+    List.fold_left (fun env (x, ty) -> add x ty env) empty l
+end
+
+type ty = int			(* just one for a bit... *)
+type value = bool array
+
+type binop = Or | Xor | And | Nand
+
+type arg =
+    | Avar of ident
+    | Aconst of value
+
+type exp =
+    | Earg of arg
+    | Ereg of ident
+    | Enot of arg
+    | Ebinop of binop * arg * arg
+    | Emux of arg * arg * arg
+    | Erom of int (*addr size*) * int (*word size*) * arg (*read_addr*)
+    | Eram of int (*addr size*) * int (*word size*)
+        * arg (*read_addr*) * arg (*write_enable*)
+        * arg (*write_addr*) * arg (*data*)
+    | Econcat of arg * arg
+    | Eslice of int * int * arg
+    | Eselect of int * arg
+
+type equation = ident * exp
+
+type program =
+    { p_eqs : equation list;
+      p_inputs : ident list;
+      p_outputs : ident list;
+      p_vars : ty Env.t; }