lustrec / src / typing.ml @ 8f1c7e91
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(* ---------------------------------------------------------------------------- |
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* SchedMCore - A MultiCore Scheduling Framework |
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* Copyright (C) 2009-2011, ONERA, Toulouse, FRANCE - LIFL, Lille, FRANCE |
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* |
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* This file is part of Prelude |
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* |
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* Prelude is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public License |
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* as published by the Free Software Foundation ; either version 2 of |
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* the License, or (at your option) any later version. |
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* |
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* Prelude is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY ; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this program ; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
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* USA |
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*---------------------------------------------------------------------------- *) |
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|
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(** Main typing module. Classic inference algorithm with destructive |
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unification. *) |
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|
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let debug fmt args = () (* Format.eprintf "%a" *) |
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(* Though it shares similarities with the clock calculus module, no code |
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is shared. Simple environments, very limited identifier scoping, no |
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identifier redefinition allowed. *) |
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|
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open Utils |
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(* Yes, opening both modules is dirty as some type names will be |
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overwritten, yet this makes notations far lighter.*) |
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open LustreSpec |
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open Corelang |
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open Types |
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open Format |
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|
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let pp_typing_env fmt env = |
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Env.pp_env print_ty fmt env |
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|
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(** [occurs tvar ty] returns true if the type variable [tvar] occurs in |
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type [ty]. False otherwise. *) |
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let rec occurs tvar ty = |
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let ty = repr ty in |
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match ty.tdesc with |
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| Tvar -> ty=tvar |
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| Tarrow (t1, t2) -> |
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(occurs tvar t1) || (occurs tvar t2) |
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| Ttuple tl -> |
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List.exists (occurs tvar) tl |
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| Tarray (_, t) |
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| Tstatic (_, t) |
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| Tclock t |
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| Tlink t -> occurs tvar t |
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| Tenum _ | Tconst _ | Tunivar | Tint | Treal | Tbool | Trat -> false |
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|
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(** Promote monomorphic type variables to polymorphic type variables. *) |
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(* Generalize by side-effects *) |
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let rec generalize ty = |
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match ty.tdesc with |
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| Tvar -> |
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(* No scopes, always generalize *) |
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ty.tdesc <- Tunivar |
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| Tarrow (t1,t2) -> |
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generalize t1; generalize t2 |
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| Ttuple tlist -> |
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List.iter generalize tlist |
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| Tstatic (d, t) |
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| Tarray (d, t) -> Dimension.generalize d; generalize t |
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| Tclock t |
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| Tlink t -> |
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generalize t |
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| Tenum _ | Tconst _ | Tunivar | Tint | Treal | Tbool | Trat -> () |
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|
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(** Downgrade polymorphic type variables to monomorphic type variables *) |
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let rec instantiate inst_vars inst_dim_vars ty = |
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let ty = repr ty in |
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match ty.tdesc with |
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| Tenum _ | Tconst _ | Tvar | Tint | Treal | Tbool | Trat -> ty |
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| Tarrow (t1,t2) -> |
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{ty with tdesc = |
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Tarrow ((instantiate inst_vars inst_dim_vars t1), (instantiate inst_vars inst_dim_vars t2))} |
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| Ttuple tlist -> |
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{ty with tdesc = Ttuple (List.map (instantiate inst_vars inst_dim_vars) tlist)} |
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| Tclock t -> |
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{ty with tdesc = Tclock (instantiate inst_vars inst_dim_vars t)} |
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| Tstatic (d, t) -> |
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{ty with tdesc = Tstatic (Dimension.instantiate inst_dim_vars d, instantiate inst_vars inst_dim_vars t)} |
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| Tarray (d, t) -> |
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{ty with tdesc = Tarray (Dimension.instantiate inst_dim_vars d, instantiate inst_vars inst_dim_vars t)} |
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| Tlink t -> |
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(* should not happen *) |
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{ty with tdesc = Tlink (instantiate inst_vars inst_dim_vars t)} |
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| Tunivar -> |
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try |
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List.assoc ty.tid !inst_vars |
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with Not_found -> |
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let var = new_var () in |
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inst_vars := (ty.tid, var)::!inst_vars; |
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var |
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|
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(* [type_coretype cty] types the type declaration [cty] *) |
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let rec type_coretype type_dim cty = |
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match (*get_repr_type*) cty with |
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| Tydec_any -> new_var () |
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| Tydec_int -> Type_predef.type_int |
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| Tydec_real -> Type_predef.type_real |
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| Tydec_float -> Type_predef.type_real |
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| Tydec_bool -> Type_predef.type_bool |
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| Tydec_clock ty -> Type_predef.type_clock (type_coretype type_dim ty) |
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| Tydec_const c -> Type_predef.type_const c |
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| Tydec_enum tl -> Type_predef.type_enum tl |
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| Tydec_array (d, ty) -> |
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begin |
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type_dim d; |
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Type_predef.type_array d (type_coretype type_dim ty) |
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end |
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|
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(* [coretype_type is the reciprocal of [type_typecore] *) |
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let rec coretype_type ty = |
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match (repr ty).tdesc with |
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| Tvar -> Tydec_any |
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| Tint -> Tydec_int |
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| Treal -> Tydec_real |
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| Tbool -> Tydec_bool |
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| Tconst c -> Tydec_const c |
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| Tclock t -> Tydec_clock (coretype_type t) |
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| Tenum tl -> Tydec_enum tl |
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| Tarray (d, t) -> Tydec_array (d, coretype_type t) |
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| Tstatic (_, t) -> coretype_type t |
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| _ -> assert false |
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|
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let get_type_definition tname = |
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try |
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type_coretype (fun d -> ()) (Hashtbl.find type_table (Tydec_const tname)) |
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with Not_found -> raise (Error (Location.dummy_loc, Unbound_type tname)) |
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|
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(** [unify t1 t2] unifies types [t1] and [t2]. Raises [Unify |
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(t1,t2)] if the types are not unifiable.*) |
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(* Standard destructive unification *) |
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let rec unify t1 t2 = |
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let t1 = repr t1 in |
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let t2 = repr t2 in |
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if t1=t2 then |
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() |
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else |
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(* No type abbreviations resolution for now *) |
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match t1.tdesc,t2.tdesc with |
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(* This case is not mandory but will keep "older" types *) |
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| Tvar, Tvar -> |
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if t1.tid < t2.tid then |
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t2.tdesc <- Tlink t1 |
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else |
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t1.tdesc <- Tlink t2 |
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| (Tvar, _) when (not (occurs t1 t2)) -> |
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t1.tdesc <- Tlink t2 |
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| (_,Tvar) when (not (occurs t2 t1)) -> |
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t2.tdesc <- Tlink t1 |
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| Tarrow (t1,t2), Tarrow (t1',t2') -> |
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begin |
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unify t1 t1'; |
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unify t2 t2' |
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end |
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| Ttuple tlist1, Ttuple tlist2 -> |
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if (List.length tlist1) <> (List.length tlist2) then |
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raise (Unify (t1, t2)) |
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else |
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List.iter2 unify tlist1 tlist2 |
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| Tclock _, Tstatic _ |
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| Tstatic _, Tclock _ -> raise (Unify (t1, t2)) |
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| Tclock t1', _ -> unify t1' t2 |
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| _, Tclock t2' -> unify t1 t2' |
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| Tint, Tint | Tbool, Tbool | Trat, Trat |
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| Tunivar, _ | _, Tunivar -> () |
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| (Tconst t, _) -> |
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let def_t = get_type_definition t in |
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unify def_t t2 |
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| (_, Tconst t) -> |
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let def_t = get_type_definition t in |
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unify t1 def_t |
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| Tenum tl, Tenum tl' when tl == tl' -> () |
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| Tstatic (e1, t1'), Tstatic (e2, t2') |
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| Tarray (e1, t1'), Tarray (e2, t2') -> |
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begin |
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unify t1' t2'; |
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Dimension.eval Basic_library.eval_env (fun c -> None) e1; |
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Dimension.eval Basic_library.eval_env (fun c -> None) e2; |
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Dimension.unify e1 e2; |
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end |
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| _,_ -> raise (Unify (t1, t2)) |
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|
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(** [semi_unify t1 t2] checks whether type [t1] is an instance of type [t2]. Raises [Unify |
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(t1,t2)] if the types are not semi-unifiable.*) |
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(* Standard destructive semi-unification *) |
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let rec semi_unify t1 t2 = |
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let t1 = repr t1 in |
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let t2 = repr t2 in |
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if t1=t2 then |
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() |
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else |
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(* No type abbreviations resolution for now *) |
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match t1.tdesc,t2.tdesc with |
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(* This case is not mandory but will keep "older" types *) |
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| Tvar, Tvar -> |
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if t1.tid < t2.tid then |
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t2.tdesc <- Tlink t1 |
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else |
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t1.tdesc <- Tlink t2 |
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| (Tvar, _) -> raise (Unify (t1, t2)) |
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| (_,Tvar) when (not (occurs t2 t1)) -> |
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t2.tdesc <- Tlink t1 |
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| Tarrow (t1,t2), Tarrow (t1',t2') -> |
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begin |
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semi_unify t1 t1'; |
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semi_unify t2 t2' |
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end |
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| Ttuple tlist1, Ttuple tlist2 -> |
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if (List.length tlist1) <> (List.length tlist2) then |
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raise (Unify (t1, t2)) |
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else |
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List.iter2 semi_unify tlist1 tlist2 |
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| Tclock _, Tstatic _ |
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| Tstatic _, Tclock _ -> raise (Unify (t1, t2)) |
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| Tclock t1', _ -> semi_unify t1' t2 |
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| _, Tclock t2' -> semi_unify t1 t2' |
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| Tint, Tint | Tbool, Tbool | Trat, Trat |
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| Tunivar, _ | _, Tunivar -> () |
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| (Tconst t, _) -> |
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let def_t = get_type_definition t in |
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semi_unify def_t t2 |
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| (_, Tconst t) -> |
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let def_t = get_type_definition t in |
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semi_unify t1 def_t |
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| Tenum tl, Tenum tl' when tl == tl' -> () |
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| Tstatic (e1, t1'), Tstatic (e2, t2') |
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| Tarray (e1, t1'), Tarray (e2, t2') -> |
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begin |
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semi_unify t1' t2'; |
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Dimension.eval Basic_library.eval_env (fun c -> Some (Dimension.mkdim_ident Location.dummy_loc c)) e1; |
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Dimension.eval Basic_library.eval_env (fun c -> Some (Dimension.mkdim_ident Location.dummy_loc c)) e2; |
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Dimension.semi_unify e1 e2; |
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end |
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| _,_ -> raise (Unify (t1, t2)) |
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|
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let try_unify ty1 ty2 loc = |
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try |
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unify ty1 ty2 |
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with |
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| Unify _ -> |
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raise (Error (loc, Type_clash (ty1,ty2))) |
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| Dimension.Unify _ -> |
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raise (Error (loc, Type_clash (ty1,ty2))) |
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|
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let try_semi_unify ty1 ty2 loc = |
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try |
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semi_unify ty1 ty2 |
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with |
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| Unify _ -> |
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raise (Error (loc, Type_clash (ty1,ty2))) |
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| Dimension.Unify _ -> |
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raise (Error (loc, Type_clash (ty1,ty2))) |
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|
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let rec type_const loc c = |
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match c with |
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| Const_int _ -> Type_predef.type_int |
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| Const_real _ -> Type_predef.type_real |
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| Const_float _ -> Type_predef.type_real |
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| Const_array ca -> let d = Dimension.mkdim_int loc (List.length ca) in |
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let ty = new_var () in |
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List.iter (fun e -> try_unify (type_const loc e) ty loc) ca; |
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Type_predef.type_array d ty |
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| Const_tag t -> |
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if Hashtbl.mem tag_table t |
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then type_coretype (fun d -> ()) (Hashtbl.find tag_table t) |
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else raise (Error (loc, Unbound_value ("enum tag " ^ t))) |
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|
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(* The following typing functions take as parameter an environment [env] |
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and whether the element being typed is expected to be constant [const]. |
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[env] is a pair composed of: |
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- a map from ident to type, associating to each ident, i.e. |
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variables, constants and (imported) nodes, its type including whether |
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it is constant or not. This latter information helps in checking constant |
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propagation policy in Lustre. |
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- a vdecl list, in order to modify types of declared variables that are |
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later discovered to be clocks during the typing process. |
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*) |
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let check_constant loc const_expected const_real = |
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if const_expected && not const_real |
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then raise (Error (loc, Not_a_constant)) |
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|
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let rec type_standard_args env in_main const expr_list = |
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let ty_list = List.map (fun e -> dynamic_type (type_expr env in_main const e)) expr_list in |
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let ty_res = new_var () in |
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List.iter2 (fun e ty -> try_unify ty_res ty e.expr_loc) expr_list ty_list; |
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ty_res |
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|
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(* emulates a subtyping relation between types t and (d : t), |
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used during node applications and assignments *) |
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and type_subtyping_arg env in_main ?(sub=true) const real_arg formal_type = |
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let loc = real_arg.expr_loc in |
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let const = const || (Types.get_static_value formal_type <> None) in |
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let real_type = type_expr env in_main const real_arg in |
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let real_type = |
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if const |
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then let d = |
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if is_dimension_type real_type |
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then dimension_of_expr real_arg |
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else Dimension.mkdim_var () in |
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let eval_const id = Types.get_static_value (Env.lookup_value (fst env) id) in |
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Dimension.eval Basic_library.eval_env eval_const d; |
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let real_static_type = Type_predef.type_static d (Types.dynamic_type real_type) in |
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(match Types.get_static_value real_type with |
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| None -> () |
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| Some d' -> try_unify real_type real_static_type loc); |
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real_static_type |
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else real_type in |
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(*Format.eprintf "subtyping const %B real %a:%a vs formal %a@." const Printers.pp_expr real_arg Types.print_ty real_type Types.print_ty formal_type;*) |
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let real_types = type_list_of_type real_type in |
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let formal_types = type_list_of_type formal_type in |
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if (List.length real_types) <> (List.length formal_types) |
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then raise (Unify (real_type, formal_type)) |
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else List.iter2 (type_subtyping loc sub) real_types formal_types |
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|
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and type_subtyping loc sub real_type formal_type = |
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match (repr real_type).tdesc, (repr formal_type).tdesc with |
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| Tstatic _ , Tstatic _ when sub -> try_unify formal_type real_type loc |
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| Tstatic (r_d, r_ty), _ when sub -> try_unify formal_type r_ty loc |
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| _ -> try_unify formal_type real_type loc |
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|
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and type_ident env in_main loc const id = |
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type_expr env in_main const (expr_of_ident id loc) |
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|
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(* typing an application implies: |
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- checking that const formal parameters match real const (maybe symbolic) arguments |
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- checking type adequation between formal and real arguments |
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*) |
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and type_appl env in_main loc const f args = |
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let tfun = type_ident env in_main loc const f in |
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let tins, touts = split_arrow tfun in |
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let tins = type_list_of_type tins in |
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let args = expr_list_of_expr args in |
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List.iter2 (type_subtyping_arg env in_main const) args tins; |
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touts |
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|
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(** [type_expr env in_main expr] types expression [expr] in environment |
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[env], expecting it to be [const] or not. *) |
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and type_expr env in_main const expr = |
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let res = |
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match expr.expr_desc with |
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| Expr_const c -> |
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let ty = type_const expr.expr_loc c in |
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let ty = Type_predef.type_static (Dimension.mkdim_var ()) ty in |
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expr.expr_type <- ty; |
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ty |
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| Expr_ident v -> |
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let tyv = |
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try |
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Env.lookup_value (fst env) v |
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with Not_found -> |
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Format.eprintf "Failure in typing expr %a@." Printers.pp_expr expr; |
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raise (Error (expr.expr_loc, Unbound_value ("identifier " ^ v))) |
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in |
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let ty = instantiate (ref []) (ref []) tyv in |
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let ty' = |
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if const |
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then Type_predef.type_static (Dimension.mkdim_var ()) (new_var ()) |
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else new_var () in |
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try_unify ty ty' expr.expr_loc; |
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expr.expr_type <- ty; |
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ty |
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| Expr_array elist -> |
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let ty_elt = type_standard_args env in_main const elist in |
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let d = Dimension.mkdim_int expr.expr_loc (List.length elist) in |
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let ty = Type_predef.type_array d ty_elt in |
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expr.expr_type <- ty; |
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ty |
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| Expr_access (e1, d) -> |
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type_subtyping_arg env in_main true (expr_of_dimension d) Type_predef.type_int; |
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let ty_elt = new_var () in |
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let d = Dimension.mkdim_var () in |
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type_subtyping_arg env in_main const e1 (Type_predef.type_array d ty_elt); |
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expr.expr_type <- ty_elt; |
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ty_elt |
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| Expr_power (e1, d) -> |
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let eval_const id = Types.get_static_value (Env.lookup_value (fst env) id) in |
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type_subtyping_arg env in_main true (expr_of_dimension d) Type_predef.type_int; |
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Dimension.eval Basic_library.eval_env eval_const d; |
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let ty_elt = type_standard_args env in_main const [e1] in |
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let ty = Type_predef.type_array d ty_elt in |
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expr.expr_type <- ty; |
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ty |
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| Expr_tuple elist -> |
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let ty = new_ty (Ttuple (List.map (type_expr env in_main const) elist)) in |
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expr.expr_type <- ty; |
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ty |
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| Expr_ite (c, t, e) -> |
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type_subtyping_arg env in_main const c Type_predef.type_bool; |
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let ty = type_standard_args env in_main const [t; e] in |
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expr.expr_type <- ty; |
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ty |
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| Expr_appl (id, args, r) -> |
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(* application of non internal function is not legal in a constant |
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expression *) |
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(match r with |
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| None -> () |
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| Some (x, l) -> |
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check_constant expr.expr_loc const false; |
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let expr_x = expr_of_ident x expr.expr_loc in |
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let typ_l = |
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Type_predef.type_clock |
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(type_const expr.expr_loc (Const_tag l)) in |
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type_subtyping_arg env in_main ~sub:false const expr_x typ_l); |
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let touts = type_appl env in_main expr.expr_loc const id args in |
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expr.expr_type <- touts; |
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touts |
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| Expr_fby (e1,e2) |
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| Expr_arrow (e1,e2) -> |
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(* fby/arrow is not legal in a constant expression *) |
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check_constant expr.expr_loc const false; |
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let ty = type_standard_args env in_main const [e1; e2] in |
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expr.expr_type <- ty; |
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ty |
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| Expr_pre e -> |
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(* pre is not legal in a constant expression *) |
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check_constant expr.expr_loc const false; |
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let ty = type_standard_args env in_main const [e] in |
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expr.expr_type <- ty; |
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ty |
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| Expr_when (e1,c,l) -> |
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(* when is not legal in a constant expression *) |
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check_constant expr.expr_loc const false; |
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let typ_l = Type_predef.type_clock (type_const expr.expr_loc (Const_tag l)) in |
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let expr_c = expr_of_ident c expr.expr_loc in |
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type_subtyping_arg env in_main ~sub:false const expr_c typ_l; |
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update_clock env in_main c expr.expr_loc typ_l; |
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let ty = type_standard_args env in_main const [e1] in |
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expr.expr_type <- ty; |
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ty |
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| Expr_merge (c,hl) -> |
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(* merge is not legal in a constant expression *) |
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check_constant expr.expr_loc const false; |
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let typ_in, typ_out = type_branches env in_main expr.expr_loc const hl in |
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let expr_c = expr_of_ident c expr.expr_loc in |
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let typ_l = Type_predef.type_clock typ_in in |
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type_subtyping_arg env in_main ~sub:false const expr_c typ_l; |
447 |
update_clock env in_main c expr.expr_loc typ_l; |
448 |
expr.expr_type <- typ_out; |
449 |
typ_out |
450 |
| Expr_uclock (e,k) | Expr_dclock (e,k) -> |
451 |
let ty = type_expr env in_main const e in |
452 |
expr.expr_type <- ty; |
453 |
ty |
454 |
| Expr_phclock (e,q) -> |
455 |
let ty = type_expr env in_main const e in |
456 |
expr.expr_type <- ty; |
457 |
ty |
458 |
in (*Format.eprintf "typing %B %a at %a = %a@." const Printers.pp_expr expr Location.pp_loc expr.expr_loc Types.print_ty res;*) res |
459 |
|
460 |
and type_branches env in_main loc const hl = |
461 |
let typ_in = new_var () in |
462 |
let typ_out = new_var () in |
463 |
try |
464 |
let used_labels = |
465 |
List.fold_left (fun accu (t, h) -> |
466 |
unify typ_in (type_const loc (Const_tag t)); |
467 |
type_subtyping_arg env in_main const h typ_out; |
468 |
if List.mem t accu |
469 |
then raise (Error (loc, Already_bound t)) |
470 |
else t :: accu) [] hl in |
471 |
let type_labels = get_enum_type_tags (coretype_type typ_in) in |
472 |
if List.sort compare used_labels <> List.sort compare type_labels |
473 |
then let unbound_tag = List.find (fun t -> not (List.mem t used_labels)) type_labels in |
474 |
raise (Error (loc, Unbound_value ("branching tag " ^ unbound_tag))) |
475 |
else (typ_in, typ_out) |
476 |
with Unify (t1, t2) -> |
477 |
raise (Error (loc, Type_clash (t1,t2))) |
478 |
|
479 |
and update_clock env in_main id loc typ = |
480 |
(*Log.report ~level:1 (fun fmt -> Format.fprintf fmt "update_clock %s with %a@ " id print_ty typ);*) |
481 |
try |
482 |
let vdecl = List.find (fun v -> v.var_id = id) (snd env) |
483 |
in vdecl.var_type <- typ |
484 |
with |
485 |
Not_found -> |
486 |
raise (Error (loc, Unbound_value ("clock " ^ id))) |
487 |
|
488 |
(** [type_eq env eq] types equation [eq] in environment [env] *) |
489 |
let type_eq env in_main undefined_vars eq = |
490 |
(* Check undefined variables, type lhs *) |
491 |
let expr_lhs = expr_of_expr_list eq.eq_loc (List.map (fun v -> expr_of_ident v eq.eq_loc) eq.eq_lhs) in |
492 |
let ty_lhs = type_expr env in_main false expr_lhs in |
493 |
(* Check multiple variable definitions *) |
494 |
let define_var id uvars = |
495 |
try |
496 |
ignore(IMap.find id uvars); |
497 |
IMap.remove id uvars |
498 |
with Not_found -> |
499 |
raise (Error (eq.eq_loc, Already_defined id)) |
500 |
in |
501 |
let undefined_vars = |
502 |
List.fold_left (fun uvars v -> define_var v uvars) undefined_vars eq.eq_lhs in |
503 |
(* Type rhs wrt to lhs type with subtyping, i.e. a constant rhs value may be assigned |
504 |
to a (always non-constant) lhs variable *) |
505 |
type_subtyping_arg env in_main false eq.eq_rhs ty_lhs; |
506 |
undefined_vars |
507 |
|
508 |
|
509 |
(* [type_coreclock env ck id loc] types the type clock declaration [ck] |
510 |
in environment [env] *) |
511 |
let type_coreclock env ck id loc = |
512 |
match ck.ck_dec_desc with |
513 |
| Ckdec_any | Ckdec_pclock (_,_) -> () |
514 |
| Ckdec_bool cl -> |
515 |
let dummy_id_expr = expr_of_ident id loc in |
516 |
let when_expr = |
517 |
List.fold_left |
518 |
(fun expr (x, l) -> |
519 |
{expr_tag = new_tag (); |
520 |
expr_desc= Expr_when (expr,x,l); |
521 |
expr_type = new_var (); |
522 |
expr_clock = Clocks.new_var true; |
523 |
expr_delay = Delay.new_var (); |
524 |
expr_loc=loc; |
525 |
expr_annot = None}) |
526 |
dummy_id_expr cl |
527 |
in |
528 |
ignore (type_expr env false false when_expr) |
529 |
|
530 |
let rec check_type_declaration loc cty = |
531 |
match cty with |
532 |
| Tydec_clock ty |
533 |
| Tydec_array (_, ty) -> check_type_declaration loc ty |
534 |
| Tydec_const tname -> |
535 |
if not (Hashtbl.mem type_table cty) |
536 |
then raise (Error (loc, Unbound_type tname)); |
537 |
| _ -> () |
538 |
|
539 |
let type_var_decl vd_env env vdecl = |
540 |
check_type_declaration vdecl.var_loc vdecl.var_dec_type.ty_dec_desc; |
541 |
let eval_const id = Types.get_static_value (Env.lookup_value env id) in |
542 |
let type_dim d = |
543 |
begin |
544 |
type_subtyping_arg (env, vd_env) false true (expr_of_dimension d) Type_predef.type_int; |
545 |
Dimension.eval Basic_library.eval_env eval_const d; |
546 |
end in |
547 |
let ty = type_coretype type_dim vdecl.var_dec_type.ty_dec_desc in |
548 |
let ty_status = |
549 |
if vdecl.var_dec_const |
550 |
then Type_predef.type_static (Dimension.mkdim_var ()) ty |
551 |
else ty in |
552 |
let new_env = Env.add_value env vdecl.var_id ty_status in |
553 |
type_coreclock (new_env,vd_env) vdecl.var_dec_clock vdecl.var_id vdecl.var_loc; |
554 |
vdecl.var_type <- ty_status; |
555 |
new_env |
556 |
|
557 |
let type_var_decl_list vd_env env l = |
558 |
List.fold_left (type_var_decl vd_env) env l |
559 |
|
560 |
let type_of_vlist vars = |
561 |
let tyl = List.map (fun v -> v.var_type) vars in |
562 |
type_of_type_list tyl |
563 |
|
564 |
let add_vdecl vd_env vdecl = |
565 |
if List.exists (fun v -> v.var_id = vdecl.var_id) vd_env |
566 |
then raise (Error (vdecl.var_loc, Already_bound vdecl.var_id)) |
567 |
else vdecl::vd_env |
568 |
|
569 |
let check_vd_env vd_env = |
570 |
ignore (List.fold_left add_vdecl [] vd_env) |
571 |
|
572 |
(** [type_node env nd loc] types node [nd] in environment env. The |
573 |
location is used for error reports. *) |
574 |
let type_node env nd loc = |
575 |
let is_main = nd.node_id = !Options.main_node in |
576 |
let vd_env_ol = nd.node_outputs@nd.node_locals in |
577 |
let vd_env = nd.node_inputs@vd_env_ol in |
578 |
check_vd_env vd_env; |
579 |
let init_env = env in |
580 |
let delta_env = type_var_decl_list vd_env init_env nd.node_inputs in |
581 |
let delta_env = type_var_decl_list vd_env delta_env nd.node_outputs in |
582 |
let delta_env = type_var_decl_list vd_env delta_env nd.node_locals in |
583 |
let new_env = Env.overwrite env delta_env in |
584 |
let undefined_vars_init = |
585 |
List.fold_left |
586 |
(fun uvs v -> IMap.add v.var_id () uvs) |
587 |
IMap.empty vd_env_ol in |
588 |
let undefined_vars = |
589 |
List.fold_left (type_eq (new_env, vd_env) is_main) undefined_vars_init nd.node_eqs |
590 |
in |
591 |
(* check that table is empty *) |
592 |
if (not (IMap.is_empty undefined_vars)) then |
593 |
raise (Error (loc, Undefined_var undefined_vars)); |
594 |
let ty_ins = type_of_vlist nd.node_inputs in |
595 |
let ty_outs = type_of_vlist nd.node_outputs in |
596 |
let ty_node = new_ty (Tarrow (ty_ins,ty_outs)) in |
597 |
generalize ty_node; |
598 |
(* TODO ? Check that no node in the hierarchy remains polymorphic ? *) |
599 |
nd.node_type <- ty_node; |
600 |
Env.add_value env nd.node_id ty_node |
601 |
|
602 |
let type_imported_node env nd loc = |
603 |
let new_env = type_var_decl_list nd.nodei_inputs env nd.nodei_inputs in |
604 |
let vd_env = nd.nodei_inputs@nd.nodei_outputs in |
605 |
check_vd_env vd_env; |
606 |
ignore(type_var_decl_list vd_env new_env nd.nodei_outputs); |
607 |
let ty_ins = type_of_vlist nd.nodei_inputs in |
608 |
let ty_outs = type_of_vlist nd.nodei_outputs in |
609 |
let ty_node = new_ty (Tarrow (ty_ins,ty_outs)) in |
610 |
generalize ty_node; |
611 |
(* |
612 |
if (is_polymorphic ty_node) then |
613 |
raise (Error (loc, Poly_imported_node nd.nodei_id)); |
614 |
*) |
615 |
let new_env = Env.add_value env nd.nodei_id ty_node in |
616 |
nd.nodei_type <- ty_node; |
617 |
new_env |
618 |
|
619 |
let type_imported_fun env nd loc = |
620 |
let new_env = type_var_decl_list nd.fun_inputs env nd.fun_inputs in |
621 |
let vd_env = nd.fun_inputs@nd.fun_outputs in |
622 |
check_vd_env vd_env; |
623 |
ignore(type_var_decl_list vd_env new_env nd.fun_outputs); |
624 |
let ty_ins = type_of_vlist nd.fun_inputs in |
625 |
let ty_outs = type_of_vlist nd.fun_outputs in |
626 |
let ty_node = new_ty (Tarrow (ty_ins,ty_outs)) in |
627 |
generalize ty_node; |
628 |
(* |
629 |
if (is_polymorphic ty_node) then |
630 |
raise (Error (loc, Poly_imported_node nd.fun_id)); |
631 |
*) |
632 |
let new_env = Env.add_value env nd.fun_id ty_node in |
633 |
nd.fun_type <- ty_node; |
634 |
new_env |
635 |
|
636 |
let type_top_consts env clist = |
637 |
List.fold_left (fun env cdecl -> |
638 |
let ty = type_const cdecl.const_loc cdecl.const_value in |
639 |
let d = |
640 |
if is_dimension_type ty |
641 |
then dimension_of_const cdecl.const_loc cdecl.const_value |
642 |
else Dimension.mkdim_var () in |
643 |
let ty = Type_predef.type_static d ty in |
644 |
let new_env = Env.add_value env cdecl.const_id ty in |
645 |
cdecl.const_type <- ty; |
646 |
new_env) env clist |
647 |
|
648 |
let type_top_decl env decl = |
649 |
match decl.top_decl_desc with |
650 |
| Node nd -> ( |
651 |
try |
652 |
type_node env nd decl.top_decl_loc |
653 |
with Error (loc, err) as exc -> ( |
654 |
if !Options.global_inline then |
655 |
Format.eprintf "Type error: failing node@.%a@.@?" |
656 |
Printers.pp_node nd |
657 |
; |
658 |
raise exc) |
659 |
) |
660 |
| ImportedNode nd -> |
661 |
type_imported_node env nd decl.top_decl_loc |
662 |
| ImportedFun nd -> |
663 |
type_imported_fun env nd decl.top_decl_loc |
664 |
| Consts clist -> |
665 |
type_top_consts env clist |
666 |
| Open _ -> env |
667 |
|
668 |
let type_prog env decls = |
669 |
try |
670 |
List.fold_left type_top_decl env decls |
671 |
with Failure _ as exc -> raise exc |
672 |
|
673 |
(* Once the Lustre program is fully typed, |
674 |
we must get back to the original description of dimensions, |
675 |
with constant parameters, instead of unifiable internal variables. *) |
676 |
|
677 |
(* The following functions aims at 'unevaluating' dimension expressions occuring in array types, |
678 |
i.e. replacing unifiable second_order variables with the original static parameters. |
679 |
Once restored in this formulation, dimensions may be meaningfully printed. |
680 |
*) |
681 |
let uneval_vdecl_generics vdecl = |
682 |
if vdecl.var_dec_const |
683 |
then |
684 |
match get_static_value vdecl.var_type with |
685 |
| None -> (Format.eprintf "internal error: %a@." Types.print_ty vdecl.var_type; assert false) |
686 |
| Some d -> Dimension.uneval vdecl.var_id d |
687 |
|
688 |
let uneval_node_generics vdecls = |
689 |
List.iter uneval_vdecl_generics vdecls |
690 |
|
691 |
let uneval_top_generics decl = |
692 |
match decl.top_decl_desc with |
693 |
| Node nd -> |
694 |
uneval_node_generics (nd.node_inputs @ nd.node_outputs) |
695 |
| ImportedNode nd -> |
696 |
uneval_node_generics (nd.nodei_inputs @ nd.nodei_outputs) |
697 |
| ImportedFun nd -> |
698 |
() |
699 |
| Consts clist -> () |
700 |
| Open _ -> () |
701 |
|
702 |
let uneval_prog_generics prog = |
703 |
List.iter uneval_top_generics prog |
704 |
|
705 |
let check_env_compat header declared computed = |
706 |
uneval_prog_generics header; |
707 |
Env.iter declared (fun k decl_type_k -> |
708 |
let computed_t = instantiate (ref []) (ref []) (Env.lookup_value computed k) in |
709 |
(*Types.print_ty Format.std_formatter decl_type_k; |
710 |
Types.print_ty Format.std_formatter computed_t;*) |
711 |
try_semi_unify decl_type_k computed_t Location.dummy_loc |
712 |
) |
713 |
|
714 |
(* Local Variables: *) |
715 |
(* compile-command:"make -C .." *) |
716 |
(* End: *) |