[pre propagation] done.

src/ast_to_c.ml

@@ -169,6 +169,7 @@ let pp_expression node_name =
     | ETuple _ ->
         Format.fprintf fmt "%a"
           pp_expression_list expression;
+    | EAuto _ -> failwith "todo"
     in
   pp_expression_aux
 

src/main.ml

@@ -9,16 +9,20 @@ let print_debug d s =
 let print_verbose v s =
   if v then Format.printf "\x1b[33;01;04mStatus:\x1b[0m %s\n" s else ()
 
-let run ast verbose debug passes =
+let exec_passes ast verbose debug passes f =
   let rec aux ast = function
-    | [] ->  Format.printf "%a" Ast_to_c.ast_to_c ast
+    | [] ->  f ast
     | (n, p) :: passes ->
+        verbose (Format.asprintf "Executing pass %s:\n" n);
         match p ast with
         | None -> (exit_error ("Error while in the pass "^n^".\n"); exit 0)
-        | Some ast -> aux ast passes
+        | Some ast -> (
+        debug (Format.asprintf "Current AST (after %s):\n%a\n" n Pp.pp_ast ast);
+        aux ast passes)
   in
   aux ast passes
 
+
 let _ =
   (** Usage and argument parsing. *)
   let default_passes = ["pre2vars"] in
@@ -45,7 +49,7 @@ let _ =
   if !source_file = "" then exit_error "No source file specified" else
   if !passes = [] then passes := default_passes;
   let print_verbose = print_verbose !verbose in
-  let print_debug = print_debug !verbose in
+  let print_debug = print_debug !debug in
 
   (** Definition of the passes table *)
   let passes_table : (string,  t_nodelist -> t_nodelist option) Hashtbl.t = Hashtbl.create 100 in
@@ -84,13 +88,19 @@ let _ =
       end
     in
 
-  if !ppast then Format.printf "%a" Pp.pp_ast ast
-  else
   let passes = List.map (fun (pass: string) -> (pass,
     match Hashtbl.find_opt passes_table pass with
     | None ->
       (exit_error (Format.sprintf "The pass %s does not exist." pass); exit 0)
     | Some f ->
       (print_debug ("The pass "^pass^" has been selected."); f))) !passes in
-    run ast print_verbose print_debug passes
+
+  print_debug (Format.asprintf "Initial AST (before executing any passes):\n%a"
+                Pp.pp_ast ast) ;
+  exec_passes ast print_verbose print_debug passes
+    begin
+    if !ppast
+      then (Format.printf "%a" Pp.pp_ast)
+      else (Format.printf "%a" Ast_to_c.ast_to_c)
+    end
 

src/parser.mly

@@ -342,14 +342,14 @@ expr:
       { let e1 = $1 in let t1 = type_exp e1 in
         let e2 = $3 in let t2 = type_exp e2 in
         if t2 = [TBool]
-         then EWhen (type_exp $1, $1, $3)
+         then EWhen (t1, e1, e2)
          else raise (MyParsingError ("The when does not type-check!",
                     current_location())) }
   | expr RESET expr
       { let e1 = $1 in let t1 = type_exp e1 in
         let e2 = $3 in let t2 = type_exp e2 in
         if t2 = [TBool]
-         then EReset (type_exp $1, $1, $3)
+         then EReset (t1, e1, e2)
          else raise (MyParsingError ("The reset does not type-check!",
                     current_location())) }
   /* Constants */

src/passes.ml

@@ -34,10 +34,60 @@ let expression_pass f: t_nodelist -> t_nodelist option =
   equation_pass aux
 
 let pre2vars =
-  let rec aux = function
+  let rec all_pre expr =
-    | EVar   (ty, v) -> EVar (ty, v)
+    match expr with
+    | EMonOp (ty, MOp_pre, expr) -> all_pre expr
+    | EMonOp _ -> false
+    | EVar _ -> true
+    | _ -> false
+  in
+  let rec pre_push expr : t_expression =
+    match expr with
+    | EVar _ -> EMonOp (Utils.type_exp expr, MOp_pre, expr)
+    | EConst _ -> expr (** pre(c) = c for any constant c *)
     | EMonOp (ty, mop, expr) ->
-               let expr = aux expr in EMonOp (ty, mop, expr)
+      begin
+        match mop with
+        | MOp_pre ->
+          if all_pre expr
+            then EMonOp (ty, mop, EMonOp (ty, mop, expr))
+            else pre_push (pre_push expr)
+        | _ -> EMonOp (ty, mop, pre_push expr)
+      end
+    | EBinOp (ty, bop, expr, expr') ->
+        let expr = pre_push expr in let expr' = pre_push expr' in
+        EBinOp (ty, bop, expr, expr')
+    | ETriOp (ty, top, expr, expr', expr'') ->
+        let expr = pre_push expr in let expr' = pre_push expr' in
+        let expr'' = pre_push expr'' in
+        ETriOp (ty, top, expr, expr', expr'')
+    | EComp  (ty, cop, expr, expr') ->
+        let expr = pre_push expr in let expr' = pre_push expr' in
+        EComp (ty, cop, expr, expr')
+    | EWhen  (ty, expr, expr') ->
+        let expr = pre_push expr in let expr' = pre_push expr' in
+        EWhen (ty, expr, expr')
+    | EReset (ty, expr, expr') ->
+        let expr = pre_push expr in let expr' = pre_push expr' in
+        EReset (ty, expr, expr')
+    | ETuple (ty, elist) ->
+        let elist =
+          List.fold_right (fun expr acc -> (pre_push expr) :: acc) elist [] in
+        ETuple (ty, elist)
+    | EApp   (ty, node, arg) ->
+        let arg = pre_push arg in
+        EApp (ty, node, arg)
+    | EAuto _ -> failwith "toto"
+  in
+  let rec aux (expr: t_expression) =
+    match expr with
+    | EVar   _ -> expr
+    | EMonOp (ty, mop, expr) ->
+      begin
+        match mop with
+        | MOp_pre -> pre_push expr
+        | _ -> let expr = aux expr in EMonOp (ty, mop, expr)
+      end
     | EBinOp (ty, bop, expr, expr') ->
         let expr = aux expr in let expr' = aux expr' in
         EBinOp (ty, bop, expr, expr')
@@ -62,6 +112,7 @@ let pre2vars =
     | EApp   (ty, node, arg) ->
         let arg = aux arg in
         EApp (ty, node, arg)
+    | EAuto _ -> failwith "todo"
   in
   expression_pass (Utils.somify aux)
 

src/test.node

@@ -6,14 +6,8 @@ tel
 node undiag_test (i: int) returns (o : bool);
 var l1, l2: int; l3: int;
 let
-	l3 = 1 -> 0;
+	l3 = (pre (1)) -> 0;
 	(l1, l2) = diagonal_int(i);
 	o = (not (not (l1 = l2))) and (l1 = l2) and true;
 tel
 
-node automaton () returns (o : bool);
-let
-	automaton
-	| Incr -> do o = (pre o) + 1 done
-	| Decr -> do o = (pre o) - 1 done
-tel

src/test_pre.node

@@ -0,0 +1,4 @@
+node n2 (i: int) returns (o: bool);
+let
+    o = pre (true and pre( i = pre(pre(i))));
+tel

src/utils.ml

@@ -32,5 +32,7 @@ let type_exp : t_expression -> full_ty = function
   | EConst (full_ty , _) -> full_ty
   | ETuple (full_ty , _) -> full_ty
   | EApp   (full_ty , _ , _) -> full_ty
+  | EAuto _ -> raise (MyParsingError ("bloup", Parsing.(symbol_start_pos(),
+  symbol_end_pos())))
 
 let somify f = fun e -> Some (f e)