diff --git a/asllib/Logging.ml b/asllib/Logging.ml
new file mode 100644
index 000000000..c981b0a16
--- /dev/null
+++ b/asllib/Logging.ml
@@ -0,0 +1,223 @@
+open AST
+open ASTUtils
+open StaticEnv
+
+let should_log = ref false
+
+(*-------------------- Helpers --------------------*)
+
+let set l =
+  let rec set_aux acc l =
+    match l with
+    | [] -> List.rev acc
+    | x :: xs ->
+        if List.mem x acc then set_aux acc xs else set_aux (x :: acc) xs
+  in
+  set_aux [] l
+
+let difference l1 l2 = List.filter (fun x -> not (List.mem x l2)) l1
+let intersection l1 l2 = List.filter (fun x -> List.mem x l2) l1
+let subset l1 l2 = List.for_all (fun x -> List.mem x l2) l1
+let equal l1 l2 = subset l1 l2 && subset l2 l1
+let pp_sep f () = Format.fprintf f ", "
+
+let func_sig_to_string f =
+  let params = List.map fst f.parameters in
+  let parameters =
+    if list_is_empty params then ""
+    else Format.asprintf "{%s}" (String.concat ", " params)
+  in
+  let arguments =
+    String.concat ", "
+      (List.map (Format.asprintf "%a" PP.pp_typed_identifier) f.args)
+  in
+  let return =
+    match f.return_type with
+    | None -> ""
+    | Some ty -> Format.asprintf " => %a" PP.pp_ty ty
+  in
+  Format.asprintf "%s %s(%s)%s" f.name parameters arguments return
+
+let with_file name f =
+  let oc =
+    open_out_gen [ Open_wronly; Open_creat; Open_trunc; Open_text ] 0o666 name
+  in
+  f oc;
+  flush oc;
+  close_out oc
+
+(*-------------------- Calculating required parameter declarations --------------------*)
+
+let rec parameters_of_expr ~env e =
+  match e.desc with
+  | E_Var x -> if is_undefined x env then [ x ] else []
+  | E_Binop (_, e1, e2) ->
+      parameters_of_expr ~env e1 @ parameters_of_expr ~env e2
+  | E_Unop (_, e) -> parameters_of_expr ~env e
+  | E_Literal _ -> []
+  | _ ->
+      Format.eprintf "@[parameters_of_expr:@.%a@.%a@]@." PP.pp_pos e PP.pp_expr
+        e;
+      failwith "Unsupported"
+
+let parameters_of_constraint ~env c =
+  match c with
+  | Constraint_Exact e -> parameters_of_expr ~env e
+  | Constraint_Range (e1, e2) ->
+      parameters_of_expr ~env e1 @ parameters_of_expr ~env e2
+
+let rec parameters_of_ty ~env ~consider_int ty =
+  match ty.desc with
+  | T_Bits (e, _) -> parameters_of_expr ~env e
+  | T_Tuple tys -> list_concat_map (parameters_of_ty ~consider_int ~env) tys
+  | T_Int (WellConstrained cs) ->
+      if consider_int then list_concat_map (parameters_of_constraint ~env) cs
+      else []
+  | T_Int UnConstrained | T_Real | T_String | T_Bool | T_Array _ | T_Named _ ->
+      []
+  | _ ->
+      Format.eprintf "@[parameters_of_expr:@.%a@.%a@]@." PP.pp_pos ty PP.pp_ty
+        ty;
+      failwith "Unsupported"
+
+let types_in_func_sig func_sig =
+  let types_in_args = List.map snd func_sig.args in
+  let return_type =
+    match func_sig.return_type with None -> [] | Some ty -> [ ty ]
+  in
+  return_type @ types_in_args
+
+let required_declarations ~env func_sig =
+  let types = types_in_func_sig func_sig in
+  let parameters =
+    list_concat_map (parameters_of_ty ~consider_int:true ~env) types
+  in
+  set parameters
+
+(*-------------------- Parameter declarations which need updating --------------------*)
+
+let parameter_declarations = ref (IMap.empty : ISet.t IMap.t)
+
+let add_parameter_declaration ~loc func_sig ~inferred ~declared =
+  let string_opt =
+    let missing = difference inferred declared in
+    let has_missing = not (list_is_empty missing) in
+    let misordered = inferred <> declared in
+    if not (has_missing || misordered) then None
+    else
+      let pp_string_list =
+        Format.pp_print_list ~pp_sep Format.pp_print_string
+      in
+      let pp_missing f missing =
+        if has_missing then
+          Format.fprintf f "MISSING: %a@." pp_string_list missing
+      in
+      let pp_misordered f (inferred, declared) =
+        if (not has_missing) && misordered then
+          Format.fprintf f "MISORDERED: expected {%a}, actual {%a}@."
+            pp_string_list inferred pp_string_list declared
+      in
+      Some
+        (Format.asprintf "%a@.%s@.%a%a@." PP.pp_pos loc
+           (func_sig_to_string func_sig)
+           pp_missing missing pp_misordered (inferred, declared))
+  in
+  match string_opt with
+  | None -> ()
+  | Some str ->
+      let updater = function
+        | None -> Some (ISet.singleton str)
+        | Some s -> Some (ISet.add str s)
+      in
+      parameter_declarations :=
+        IMap.update func_sig.name updater !parameter_declarations
+
+let log_parameter_declarations ~loc ~env (func_sig : func) type_checker_inferred
+    =
+  if
+    !should_log
+    && (not (Builder.is_stdlib_name func_sig.name))
+    && not (func_sig.body = SB_Primitive)
+  then
+    let inferred = required_declarations ~env func_sig in
+    let _ = assert (equal type_checker_inferred inferred) in
+    let declared = List.map fst func_sig.parameters in
+    add_parameter_declaration ~loc func_sig ~inferred ~declared
+
+let print_parameter_declarations () =
+  if !should_log && not (IMap.is_empty !parameter_declarations) then
+    with_file "declarations.txt" (fun oc ->
+        IMap.iter
+          (fun name s ->
+            Printf.fprintf oc "*** Function %s: %i declarations ***\n" name
+              (ISet.cardinal s);
+            ISet.iter
+              (fun str ->
+                Printf.fprintf oc "%s" (Format.asprintf "@[<v 4>%s@]" str))
+              s;
+            Printf.fprintf oc "\n")
+          !parameter_declarations)
+
+(*-------------------- Parameter instantiations which need manual updating --------------------*)
+
+let parameter_instantiations = ref (IMap.empty : (int * ISet.t) IMap.t)
+
+let add_parameter_instantiation name func =
+  let updater = function
+    | None -> Some (1, ISet.singleton (func_sig_to_string func))
+    | Some (i, s) -> Some (i + 1, ISet.add (func_sig_to_string func) s)
+  in
+  parameter_instantiations := IMap.update name updater !parameter_instantiations
+
+let can_infer_parameters func_sig =
+  match (func_sig.parameters, func_sig.args) with
+  | [ (n, _) ], [ (_, { desc = T_Bits ({ desc = E_Var n' }, _) }) ] ->
+      (Builder.is_stdlib_name func_sig.name || func_sig.body = SB_Primitive)
+      && String.equal n n'
+  | _ -> false
+
+let log_parameter_instantiations ~env name func eqs =
+  if
+    !should_log
+    && (not (list_is_empty eqs)) (* there are instantiations *)
+    && not (can_infer_parameters func)
+    (* which are not inferred *)
+  then
+    let env = { env with local = empty_local } in
+    let return_params =
+      match func.return_type with
+      | None -> ISet.empty
+      | Some ty ->
+          parameters_of_ty ~env ~consider_int:false ty
+          |> ISet.of_list
+          |> ISet.filter (fun name -> List.mem_assoc name func.parameters)
+    in
+    if ISet.is_empty return_params (* and are not return parameters *) then
+      let parameters =
+        List.fold_left
+          (fun acc (x, _) -> if List.mem x acc then acc else x :: acc)
+          [] eqs
+      in
+      let new_parameters =
+        (* and are not already in argument list *)
+        List.filter (fun x -> not (List.mem_assoc x func.args)) parameters
+      in
+      if not (list_is_empty new_parameters) then
+        add_parameter_instantiation name func
+
+let print_parameter_instantiations ?(verbose = false) () =
+  if !should_log && not (IMap.is_empty !parameter_instantiations) then
+    let sorted =
+      !parameter_instantiations |> IMap.bindings
+      |> List.sort (fun (_, (n1, _)) (_, (n2, _)) -> n2 - n1)
+    in
+    let total = List.fold_left (fun acc (_, (i, _)) -> acc + i) 0 sorted in
+    with_file "instantiations.txt" (fun oc ->
+        Printf.fprintf oc "Total call sites: %i\n\n" total;
+        List.iter
+          (fun (n, (i, s)) ->
+            Printf.fprintf oc "%6i %s\n" i n;
+            if verbose then (
+              ISet.iter (Printf.fprintf oc "         %s\n") s;
+              Printf.fprintf oc "\n"))
+          sorted)
diff --git a/asllib/Typing.ml b/asllib/Typing.ml
index 4fec69aac..dcc265fb8 100644
--- a/asllib/Typing.ml
+++ b/asllib/Typing.ml
@@ -1210,6 +1210,7 @@ module Annotate (C : ANNOTATE_CONFIG) : S = struct
       | _ -> fatal_from loc @@ Error.MismatchedReturnValue name
     in
     let () = if false then Format.eprintf "Annotated call to %S.@." name1 in
+    let _ = Logging.log_parameter_instantiations ~env name callee eqs3 in
     (name1, args1, eqs3, ret_ty_opt) |: TypingRule.AnnotateCallArgTyped
   (* End *)
 
@@ -2554,6 +2555,10 @@ module Annotate (C : ANNOTATE_CONFIG) : S = struct
         in
         ISet.fold folder potential_params (env3, parameters)
     in
+    let _ =
+      Logging.log_parameter_declarations ~loc ~env:env1 func_sig
+        (List.map fst parameters)
+    in
     let () =
       if false then
         let open Format in
@@ -3025,7 +3030,11 @@ module Annotate (C : ANNOTATE_CONFIG) : S = struct
       let ast_rev, env = fold_topo ast ([], env) in
       (List.rev ast_rev, env)
 
-  let type_check_ast ast = type_check_ast_in_env empty_global ast
+  let type_check_ast ast =
+    let res = type_check_ast_in_env empty_global ast in
+    Logging.print_parameter_declarations ();
+    Logging.print_parameter_instantiations ();
+    res
   (* End *)
 end
 
diff --git a/asllib/aslref.ml b/asllib/aslref.ml
index 9b0c0ba0d..37f8d97b2 100644
--- a/asllib/aslref.ml
+++ b/asllib/aslref.ml
@@ -34,6 +34,7 @@ type args = {
   show_rules : bool;
   strictness : Typing.strictness;
   output_format : Error.output_format;
+  log_parameters : bool;
 }
 
 let push thing ref = ref := thing :: !ref
@@ -51,6 +52,7 @@ let parse_args () =
   let show_version = ref false in
   let push_file file_type s = target_files := (file_type, s) :: !target_files in
   let output_format = ref Error.HumanReadable in
+  let log_parameters = ref false in
 
   let speclist =
     [
@@ -97,6 +99,10 @@ let parse_args () =
         Arg.String (push_file NormalV1),
         "Use ASLv1 parser for this file. (default)" );
       ("--version", Arg.Set show_version, " Print version and exit.");
+      ( "--log-parameters",
+        Arg.Set log_parameters,
+        " Log parameter declarations and instantiations for proposed ASL1 \
+         changes." );
     ]
     |> Arg.align ?limit:None
   in
@@ -124,6 +130,7 @@ let parse_args () =
       strictness = !strictness;
       show_rules = !show_rules;
       output_format = !output_format;
+      log_parameters = !log_parameters;
     }
   in
 
@@ -158,6 +165,8 @@ let or_exit f =
 let () =
   let args = parse_args () in
 
+  let () = Logging.should_log := args.log_parameters in
+
   let extra_main =
     match args.opn with
     | None -> []