lustrec / src / typing.ml @ ef34b4ae
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(********************************************************************) |
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(* *) |
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(* The LustreC compiler toolset / The LustreC Development Team *) |
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(* Copyright 2012 - -- ONERA - CNRS - INPT - LIFL *) |
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(* *) |
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(* LustreC is free software, distributed WITHOUT ANY WARRANTY *) |
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(* under the terms of the GNU Lesser General Public License *) |
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(* version 2.1. *) |
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(* *) |
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(* This file was originally from the Prelude compiler *) |
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(* *) |
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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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| Tstruct fl -> |
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List.exists (fun (f, t) -> occurs tvar t) fl |
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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 tl -> |
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List.iter generalize tl |
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| Tstruct fl -> |
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List.iter (fun (f, t) -> generalize t) fl |
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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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| Tstruct flist -> |
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{ty with tdesc = Tstruct (List.map (fun (f, t) -> (f, instantiate inst_vars inst_dim_vars t)) flist)} |
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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_struct fl -> Type_predef.type_struct (List.map (fun (f, ty) -> (f, type_coretype type_dim ty)) fl) |
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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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| Tstruct fl -> Tydec_struct (List.map (fun (f, t) -> (f, coretype_type t)) fl) |
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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_coretype_definition tname = |
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try |
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let top = Hashtbl.find type_table (Tydec_const tname) in |
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match top.top_decl_desc with |
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| TypeDef tdef -> tdef.tydef_desc |
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| _ -> assert false |
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with Not_found -> raise (Error (Location.dummy_loc, Unbound_type tname)) |
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|
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let get_type_definition tname = |
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type_coretype (fun d -> ()) (get_coretype_definition tname) |
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|
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(* Equality on ground types only *) |
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(* Should be used between local variables which must have a ground type *) |
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let rec eq_ground t1 t2 = |
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let t1 = repr t1 in |
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let t2 = repr t2 in |
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t1==t2 || |
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match t1.tdesc, t2.tdesc with |
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| Tint, Tint | Tbool, Tbool | Trat, Trat | Treal, Treal -> true |
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| Tenum tl, Tenum tl' when tl == tl' -> true |
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| Ttuple tl, Ttuple tl' when List.length tl = List.length tl' -> List.for_all2 eq_ground tl tl' |
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| Tstruct fl, Tstruct fl' when List.map fst fl = List.map fst fl' -> List.for_all2 (fun (_, t) (_, t') -> eq_ground t t') fl fl' |
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| (Tconst t, _) -> |
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let def_t = get_type_definition t in |
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eq_ground 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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eq_ground t1 def_t |
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| Tarrow (t1,t2), Tarrow (t1',t2') -> eq_ground t1 t1' && eq_ground t2 t2' |
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| Tclock t1', Tclock t2' -> eq_ground t1' t2' |
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| Tstatic (e1, t1'), Tstatic (e2, t2') |
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| Tarray (e1, t1'), Tarray (e2, t2') -> Dimension.is_eq_dimension e1 e2 && eq_ground t1' t2' |
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| _ -> false |
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|
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(** [unify t1 t2] unifies types [t1] and [t2] |
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using standard destructive unification. |
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Raises [Unify (t1,t2)] if the types are not unifiable. |
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[t1] is a expected/formal/spec type, [t2] is a computed/real/implem type, |
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so in case of unification error: expected type [t1], got type [t2]. |
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If [sub]-typing is allowed, [t2] may be a subtype of [t1]. |
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If [semi] unification is required, |
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[t1] should furthermore be an instance of [t2] |
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and constants are handled differently.*) |
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let unify ?(sub=false) ?(semi=false) t1 t2 = |
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let rec unif 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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match t1.tdesc,t2.tdesc with |
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(* strictly subtyping cases first *) |
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| _ , Tclock t2 when sub && (get_clock_base_type t1 = None) -> |
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unif t1 t2 |
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| _ , Tstatic (d2, t2) when sub && (get_static_value t1 = None) -> |
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unif t1 t2 |
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(* This case is not mandatory 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 semi) && (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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unif t2 t2'; |
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unif t1' t1 |
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end |
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| Ttuple tl, Ttuple tl' when List.length tl = List.length tl' -> |
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List.iter2 unif tl tl' |
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| Ttuple [t1] , _ -> unif t1 t2 |
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| _ , Ttuple [t2] -> unif t1 t2 |
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| Tstruct fl, Tstruct fl' when List.map fst fl = List.map fst fl' -> |
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List.iter2 (fun (_, t) (_, t') -> unif t t') fl fl' |
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| Tclock _, Tstatic _ |
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| Tstatic _, Tclock _ -> raise (Unify (t1, t2)) |
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| Tclock t1', Tclock t2' -> unif t1' t2' |
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| Tint, Tint | Tbool, Tbool | Trat, Trat | Treal, Treal |
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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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unif 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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unif 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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let eval_const = |
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if semi |
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then (fun c -> Some (Dimension.mkdim_ident Location.dummy_loc c)) |
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else (fun c -> None) in |
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begin |
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unif t1' t2'; |
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Dimension.eval Basic_library.eval_env eval_const e1; |
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Dimension.eval Basic_library.eval_env eval_const e2; |
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Dimension.unify ~semi:semi e1 e2; |
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end |
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| _,_ -> raise (Unify (t1, t2)) |
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in unif t1 t2 |
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|
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(* Expected type ty1, got type ty2 *) |
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let try_unify ?(sub=false) ?(semi=false) ty1 ty2 loc = |
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try |
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unify ~sub:sub ~semi:semi 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_struct_const_field loc (label, c) = |
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if Hashtbl.mem field_table label |
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then let tydef = Hashtbl.find field_table label in |
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let tydec = (typedef_of_top tydef).tydef_desc in |
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let tydec_struct = get_struct_type_fields tydec in |
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let ty_label = type_coretype (fun d -> ()) (List.assoc label tydec_struct) in |
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begin |
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try_unify ty_label (type_const loc c) loc; |
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type_coretype (fun d -> ()) tydec |
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end |
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else raise (Error (loc, Unbound_value ("struct field " ^ label))) |
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|
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and 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 ty (type_const loc e) 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 |
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let tydef = typedef_of_top (Hashtbl.find tag_table t) in |
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let tydec = |
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if is_user_type tydef.tydef_desc |
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then Tydec_const tydef.tydef_id |
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else tydef.tydef_desc in |
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type_coretype (fun d -> ()) tydec |
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else raise (Error (loc, Unbound_value ("enum tag " ^ t))) |
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| Const_struct fl -> |
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let ty_struct = new_var () in |
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begin |
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let used = |
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List.fold_left |
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(fun acc (l, c) -> |
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if List.mem l acc |
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then raise (Error (loc, Already_bound ("struct field " ^ l))) |
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else try_unify ty_struct (type_struct_const_field loc (l, c)) loc; l::acc) |
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[] fl in |
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try |
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let total = List.map fst (get_struct_type_fields (coretype_type ty_struct)) in |
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(* List.iter (fun l -> Format.eprintf "total: %s@." l) total; |
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List.iter (fun l -> Format.eprintf "used: %s@." l) used; *) |
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let undef = List.find (fun l -> not (List.mem l used)) total |
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in raise (Error (loc, Unbound_value ("struct field " ^ undef))) |
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with Not_found -> |
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ty_struct |
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end |
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| Const_string _ -> assert false (* string should only appear in annotations *) |
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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_add_const env const arg targ = |
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if const |
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then let d = |
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if is_dimension_type targ |
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then dimension_of_expr 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 targ) in |
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(match Types.get_static_value targ with |
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| None -> () |
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| Some d' -> try_unify targ real_static_type arg.expr_loc); |
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real_static_type |
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else targ |
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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_add_const env const real_arg (type_expr env in_main const real_arg) 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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try_unify ~sub:sub 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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An application may embed an homomorphic/internal function, in which case we need to split |
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it in many calls |
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*) |
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and type_appl env in_main loc const f args = |
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let targs = List.map (type_expr env in_main const) args in |
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if Basic_library.is_internal_fun f && List.exists is_tuple_type targs |
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then |
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try |
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let targs = Utils.transpose_list (List.map type_list_of_type targs) in |
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Types.type_of_type_list (List.map (type_simple_call env in_main loc const f) targs) |
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with |
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Utils.TransposeError (l, l') -> raise (Error (loc, WrongMorphism (l, l'))) |
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else |
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type_dependent_call env in_main loc const f (List.combine args targs) |
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|
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(* type a call with possible dependent types. [targs] is here a list of (argument, type) pairs. *) |
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and type_dependent_call env in_main loc const f targs = |
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let tins, touts = new_var (), new_var () in |
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let tfun = Type_predef.type_arrow tins touts in |
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type_subtyping_arg env in_main const (expr_of_ident f loc) tfun; |
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let tins = type_list_of_type tins in |
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if List.length targs <> List.length tins then |
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raise (Error (loc, WrongArity (List.length tins, List.length targs))) |
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else |
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begin |
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List.iter2 (fun (a,t) ti -> |
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let t' = type_add_const env (const || Types.get_static_value ti <> None) a t |
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in try_unify ~sub:true ti t' a.expr_loc) targs tins; |
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touts |
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end |
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|
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(* type a simple call without dependent types |
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but possible homomorphic extension. |
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[targs] is here a list of arguments' types. *) |
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and type_simple_call env in_main loc const f targs = |
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let tins, touts = new_var (), new_var () in |
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let tfun = Type_predef.type_arrow tins touts in |
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type_subtyping_arg env in_main const (expr_of_ident f loc) tfun; |
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(*Format.eprintf "try unify %a %a@." Types.print_ty tins Types.print_ty (type_of_type_list targs);*) |
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try_unify ~sub:true tins (type_of_type_list targs) loc; |
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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 resulting_ty = |
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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 = new_var () in |
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List.iter (fun e -> try_unify ty_elt (type_appl env in_main expr.expr_loc const "uminus" [e]) e.expr_loc) elist; |
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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_appl env in_main expr.expr_loc const "uminus" [e1] in |
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let ty = Type_predef.type_array d ty_elt in |
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expr.expr_type <- ty; |
432 |
ty |
433 |
| Expr_tuple elist -> |
434 |
let ty = new_ty (Ttuple (List.map (type_expr env in_main const) elist)) in |
435 |
expr.expr_type <- ty; |
436 |
ty |
437 |
| Expr_ite (c, t, e) -> |
438 |
type_subtyping_arg env in_main const c Type_predef.type_bool; |
439 |
let ty = type_appl env in_main expr.expr_loc const "+" [t; e] in |
440 |
expr.expr_type <- ty; |
441 |
ty |
442 |
| Expr_appl (id, args, r) -> |
443 |
(* application of non internal function is not legal in a constant |
444 |
expression *) |
445 |
(match r with |
446 |
| None -> () |
447 |
| Some (x, l) -> |
448 |
check_constant expr.expr_loc const false; |
449 |
let expr_x = expr_of_ident x expr.expr_loc in |
450 |
let typ_l = |
451 |
Type_predef.type_clock |
452 |
(type_const expr.expr_loc (Const_tag l)) in |
453 |
type_subtyping_arg env in_main ~sub:false const expr_x typ_l); |
454 |
let touts = type_appl env in_main expr.expr_loc const id (expr_list_of_expr args) in |
455 |
expr.expr_type <- touts; |
456 |
touts |
457 |
| Expr_fby (e1,e2) |
458 |
| Expr_arrow (e1,e2) -> |
459 |
(* fby/arrow is not legal in a constant expression *) |
460 |
check_constant expr.expr_loc const false; |
461 |
let ty = type_appl env in_main expr.expr_loc const "+" [e1; e2] in |
462 |
expr.expr_type <- ty; |
463 |
ty |
464 |
| Expr_pre e -> |
465 |
(* pre is not legal in a constant expression *) |
466 |
check_constant expr.expr_loc const false; |
467 |
let ty = type_appl env in_main expr.expr_loc const "uminus" [e] in |
468 |
expr.expr_type <- ty; |
469 |
ty |
470 |
| Expr_when (e1,c,l) -> |
471 |
(* when is not legal in a constant expression *) |
472 |
check_constant expr.expr_loc const false; |
473 |
let typ_l = Type_predef.type_clock (type_const expr.expr_loc (Const_tag l)) in |
474 |
let expr_c = expr_of_ident c expr.expr_loc in |
475 |
type_subtyping_arg env in_main ~sub:false const expr_c typ_l; |
476 |
let ty = type_appl env in_main expr.expr_loc const "uminus" [e1] in |
477 |
expr.expr_type <- ty; |
478 |
ty |
479 |
| Expr_merge (c,hl) -> |
480 |
(* merge is not legal in a constant expression *) |
481 |
check_constant expr.expr_loc const false; |
482 |
let typ_in, typ_out = type_branches env in_main expr.expr_loc const hl in |
483 |
let expr_c = expr_of_ident c expr.expr_loc in |
484 |
let typ_l = Type_predef.type_clock typ_in in |
485 |
type_subtyping_arg env in_main ~sub:false const expr_c typ_l; |
486 |
expr.expr_type <- typ_out; |
487 |
typ_out |
488 |
in |
489 |
Log.report ~level:3 (fun fmt -> Format.fprintf fmt "Type of expr %a: %a@." Printers.pp_expr expr Types.print_ty resulting_ty); |
490 |
resulting_ty |
491 |
|
492 |
and type_branches env in_main loc const hl = |
493 |
let typ_in = new_var () in |
494 |
let typ_out = new_var () in |
495 |
try |
496 |
let used_labels = |
497 |
List.fold_left (fun accu (t, h) -> |
498 |
unify typ_in (type_const loc (Const_tag t)); |
499 |
type_subtyping_arg env in_main const h typ_out; |
500 |
if List.mem t accu |
501 |
then raise (Error (loc, Already_bound t)) |
502 |
else t :: accu) [] hl in |
503 |
let type_labels = get_enum_type_tags (coretype_type typ_in) in |
504 |
if List.sort compare used_labels <> List.sort compare type_labels |
505 |
then let unbound_tag = List.find (fun t -> not (List.mem t used_labels)) type_labels in |
506 |
raise (Error (loc, Unbound_value ("branching tag " ^ unbound_tag))) |
507 |
else (typ_in, typ_out) |
508 |
with Unify (t1, t2) -> |
509 |
raise (Error (loc, Type_clash (t1,t2))) |
510 |
|
511 |
(** [type_eq env eq] types equation [eq] in environment [env] *) |
512 |
let type_eq env in_main undefined_vars eq = |
513 |
(* Check undefined variables, type lhs *) |
514 |
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 |
515 |
let ty_lhs = type_expr env in_main false expr_lhs in |
516 |
(* Check multiple variable definitions *) |
517 |
let define_var id uvars = |
518 |
try |
519 |
ignore(IMap.find id uvars); |
520 |
IMap.remove id uvars |
521 |
with Not_found -> |
522 |
raise (Error (eq.eq_loc, Already_defined id)) |
523 |
in |
524 |
(* check assignment of declared constant, assignment of clock *) |
525 |
let ty_lhs = |
526 |
type_of_type_list |
527 |
(List.map2 (fun ty id -> |
528 |
if get_static_value ty <> None |
529 |
then raise (Error (eq.eq_loc, Assigned_constant id)) else |
530 |
match get_clock_base_type ty with |
531 |
| None -> ty |
532 |
| Some ty -> ty) |
533 |
(type_list_of_type ty_lhs) eq.eq_lhs) in |
534 |
let undefined_vars = |
535 |
List.fold_left (fun uvars v -> define_var v uvars) undefined_vars eq.eq_lhs in |
536 |
(* Type rhs wrt to lhs type with subtyping, i.e. a constant rhs value may be assigned |
537 |
to a (always non-constant) lhs variable *) |
538 |
type_subtyping_arg env in_main false eq.eq_rhs ty_lhs; |
539 |
undefined_vars |
540 |
|
541 |
|
542 |
(* [type_coreclock env ck id loc] types the type clock declaration [ck] |
543 |
in environment [env] *) |
544 |
let type_coreclock env ck id loc = |
545 |
match ck.ck_dec_desc with |
546 |
| Ckdec_any | Ckdec_pclock (_,_) -> () |
547 |
| Ckdec_bool cl -> |
548 |
let dummy_id_expr = expr_of_ident id loc in |
549 |
let when_expr = |
550 |
List.fold_left |
551 |
(fun expr (x, l) -> |
552 |
{expr_tag = new_tag (); |
553 |
expr_desc= Expr_when (expr,x,l); |
554 |
expr_type = new_var (); |
555 |
expr_clock = Clocks.new_var true; |
556 |
expr_delay = Delay.new_var (); |
557 |
expr_loc=loc; |
558 |
expr_annot = None}) |
559 |
dummy_id_expr cl |
560 |
in |
561 |
ignore (type_expr env false false when_expr) |
562 |
|
563 |
let rec check_type_declaration loc cty = |
564 |
match cty with |
565 |
| Tydec_clock ty |
566 |
| Tydec_array (_, ty) -> check_type_declaration loc ty |
567 |
| Tydec_const tname -> |
568 |
if not (Hashtbl.mem type_table cty) |
569 |
then raise (Error (loc, Unbound_type tname)); |
570 |
| _ -> () |
571 |
|
572 |
let type_var_decl vd_env env vdecl = |
573 |
check_type_declaration vdecl.var_loc vdecl.var_dec_type.ty_dec_desc; |
574 |
let eval_const id = Types.get_static_value (Env.lookup_value env id) in |
575 |
let type_dim d = |
576 |
begin |
577 |
type_subtyping_arg (env, vd_env) false true (expr_of_dimension d) Type_predef.type_int; |
578 |
Dimension.eval Basic_library.eval_env eval_const d; |
579 |
end in |
580 |
let ty = type_coretype type_dim vdecl.var_dec_type.ty_dec_desc in |
581 |
let ty_status = |
582 |
if vdecl.var_dec_const |
583 |
then Type_predef.type_static (Dimension.mkdim_var ()) ty |
584 |
else ty in |
585 |
let new_env = Env.add_value env vdecl.var_id ty_status in |
586 |
type_coreclock (new_env,vd_env) vdecl.var_dec_clock vdecl.var_id vdecl.var_loc; |
587 |
vdecl.var_type <- ty_status; |
588 |
new_env |
589 |
|
590 |
let type_var_decl_list vd_env env l = |
591 |
List.fold_left (type_var_decl vd_env) env l |
592 |
|
593 |
let type_of_vlist vars = |
594 |
let tyl = List.map (fun v -> v.var_type) vars in |
595 |
type_of_type_list tyl |
596 |
|
597 |
let add_vdecl vd_env vdecl = |
598 |
if List.exists (fun v -> v.var_id = vdecl.var_id) vd_env |
599 |
then raise (Error (vdecl.var_loc, Already_bound vdecl.var_id)) |
600 |
else vdecl::vd_env |
601 |
|
602 |
let check_vd_env vd_env = |
603 |
ignore (List.fold_left add_vdecl [] vd_env) |
604 |
|
605 |
(** [type_node env nd loc] types node [nd] in environment env. The |
606 |
location is used for error reports. *) |
607 |
let type_node env nd loc = |
608 |
let is_main = nd.node_id = !Options.main_node in |
609 |
let vd_env_ol = nd.node_outputs@nd.node_locals in |
610 |
let vd_env = nd.node_inputs@vd_env_ol in |
611 |
check_vd_env vd_env; |
612 |
let init_env = env in |
613 |
let delta_env = type_var_decl_list vd_env init_env nd.node_inputs in |
614 |
let delta_env = type_var_decl_list vd_env delta_env nd.node_outputs in |
615 |
let delta_env = type_var_decl_list vd_env delta_env nd.node_locals in |
616 |
let new_env = Env.overwrite env delta_env in |
617 |
let undefined_vars_init = |
618 |
List.fold_left |
619 |
(fun uvs v -> IMap.add v.var_id () uvs) |
620 |
IMap.empty vd_env_ol in |
621 |
let undefined_vars = |
622 |
List.fold_left (type_eq (new_env, vd_env) is_main) undefined_vars_init nd.node_eqs |
623 |
in |
624 |
(* Typing asserts *) |
625 |
List.iter (fun assert_ -> |
626 |
let assert_expr = assert_.assert_expr in |
627 |
type_subtyping_arg (new_env, vd_env) is_main false assert_expr Type_predef.type_bool |
628 |
) nd.node_asserts; |
629 |
|
630 |
(* check that table is empty *) |
631 |
if (not (IMap.is_empty undefined_vars)) then |
632 |
raise (Error (loc, Undefined_var undefined_vars)); |
633 |
let ty_ins = type_of_vlist nd.node_inputs in |
634 |
let ty_outs = type_of_vlist nd.node_outputs in |
635 |
let ty_node = new_ty (Tarrow (ty_ins,ty_outs)) in |
636 |
generalize ty_node; |
637 |
(* TODO ? Check that no node in the hierarchy remains polymorphic ? *) |
638 |
nd.node_type <- ty_node; |
639 |
Env.add_value env nd.node_id ty_node |
640 |
|
641 |
let type_imported_node env nd loc = |
642 |
let new_env = type_var_decl_list nd.nodei_inputs env nd.nodei_inputs in |
643 |
let vd_env = nd.nodei_inputs@nd.nodei_outputs in |
644 |
check_vd_env vd_env; |
645 |
ignore(type_var_decl_list vd_env new_env nd.nodei_outputs); |
646 |
let ty_ins = type_of_vlist nd.nodei_inputs in |
647 |
let ty_outs = type_of_vlist nd.nodei_outputs in |
648 |
let ty_node = new_ty (Tarrow (ty_ins,ty_outs)) in |
649 |
generalize ty_node; |
650 |
(* |
651 |
if (is_polymorphic ty_node) then |
652 |
raise (Error (loc, Poly_imported_node nd.nodei_id)); |
653 |
*) |
654 |
let new_env = Env.add_value env nd.nodei_id ty_node in |
655 |
nd.nodei_type <- ty_node; |
656 |
new_env |
657 |
|
658 |
let type_top_const env cdecl = |
659 |
let ty = type_const cdecl.const_loc cdecl.const_value in |
660 |
let d = |
661 |
if is_dimension_type ty |
662 |
then dimension_of_const cdecl.const_loc cdecl.const_value |
663 |
else Dimension.mkdim_var () in |
664 |
let ty = Type_predef.type_static d ty in |
665 |
let new_env = Env.add_value env cdecl.const_id ty in |
666 |
cdecl.const_type <- ty; |
667 |
new_env |
668 |
|
669 |
let type_top_consts env clist = |
670 |
List.fold_left type_top_const env clist |
671 |
|
672 |
let rec type_top_decl env decl = |
673 |
match decl.top_decl_desc with |
674 |
| Node nd -> ( |
675 |
try |
676 |
type_node env nd decl.top_decl_loc |
677 |
with Error (loc, err) as exc -> ( |
678 |
if !Options.global_inline then |
679 |
Format.eprintf "Type error: failing node@.%a@.@?" |
680 |
Printers.pp_node nd |
681 |
; |
682 |
raise exc) |
683 |
) |
684 |
| ImportedNode nd -> |
685 |
type_imported_node env nd decl.top_decl_loc |
686 |
| Const c -> |
687 |
type_top_const env c |
688 |
| TypeDef _ -> List.fold_left type_top_decl env (consts_of_enum_type decl) |
689 |
| Open _ -> env |
690 |
|
691 |
let type_prog env decls = |
692 |
try |
693 |
List.fold_left type_top_decl env decls |
694 |
with Failure _ as exc -> raise exc |
695 |
|
696 |
(* Once the Lustre program is fully typed, |
697 |
we must get back to the original description of dimensions, |
698 |
with constant parameters, instead of unifiable internal variables. *) |
699 |
|
700 |
(* The following functions aims at 'unevaluating' dimension expressions occuring in array types, |
701 |
i.e. replacing unifiable second_order variables with the original static parameters. |
702 |
Once restored in this formulation, dimensions may be meaningfully printed. |
703 |
*) |
704 |
let uneval_vdecl_generics vdecl = |
705 |
if vdecl.var_dec_const |
706 |
then |
707 |
match get_static_value vdecl.var_type with |
708 |
| None -> (Format.eprintf "internal error: %a@." Types.print_ty vdecl.var_type; assert false) |
709 |
| Some d -> Dimension.uneval vdecl.var_id d |
710 |
|
711 |
let uneval_node_generics vdecls = |
712 |
List.iter uneval_vdecl_generics vdecls |
713 |
|
714 |
let uneval_top_generics decl = |
715 |
match decl.top_decl_desc with |
716 |
| Node nd -> |
717 |
uneval_node_generics (nd.node_inputs @ nd.node_outputs) |
718 |
| ImportedNode nd -> |
719 |
uneval_node_generics (nd.nodei_inputs @ nd.nodei_outputs) |
720 |
| Const _ |
721 |
| TypeDef _ |
722 |
| Open _ -> () |
723 |
|
724 |
let uneval_prog_generics prog = |
725 |
List.iter uneval_top_generics prog |
726 |
|
727 |
let rec get_imported_symbol decls id = |
728 |
match decls with |
729 |
| [] -> assert false |
730 |
| decl::q -> |
731 |
(match decl.top_decl_desc with |
732 |
| ImportedNode nd when id = nd.nodei_id && decl.top_decl_itf -> decl |
733 |
| Const c when id = c.const_id && decl.top_decl_itf -> decl |
734 |
| TypeDef _ -> get_imported_symbol (consts_of_enum_type decl @ q) id |
735 |
| _ -> get_imported_symbol q id) |
736 |
|
737 |
let check_env_compat header declared computed = |
738 |
uneval_prog_generics header; |
739 |
Env.iter declared (fun k decl_type_k -> |
740 |
let loc = (get_imported_symbol header k).top_decl_loc in |
741 |
let computed_t = |
742 |
instantiate (ref []) (ref []) |
743 |
(try Env.lookup_value computed k |
744 |
with Not_found -> raise (Error (loc, Declared_but_undefined k))) in |
745 |
(*Types.print_ty Format.std_formatter decl_type_k; |
746 |
Types.print_ty Format.std_formatter computed_t;*) |
747 |
try_unify ~sub:true ~semi:true decl_type_k computed_t loc |
748 |
) |
749 |
|
750 |
let check_typedef_top decl = |
751 |
(*Format.eprintf "check_typedef %a@." Printers.pp_short_decl decl;*) |
752 |
(*Printers.pp_var_type_dec_desc (typedef_of_top decl).tydef_id*) |
753 |
(*Format.eprintf "%a" Corelang.print_type_table ();*) |
754 |
match decl.top_decl_desc with |
755 |
| TypeDef ty -> |
756 |
let owner = decl.top_decl_owner in |
757 |
let itf = decl.top_decl_itf in |
758 |
let decl' = |
759 |
try Hashtbl.find type_table (Tydec_const (typedef_of_top decl).tydef_id) |
760 |
with Not_found -> raise (Error (decl.top_decl_loc, Declared_but_undefined ("type "^ ty.tydef_id))) in |
761 |
let owner' = decl'.top_decl_owner in |
762 |
let itf' = decl'.top_decl_itf in |
763 |
(match decl'.top_decl_desc with |
764 |
| Const _ | Node _ | ImportedNode _ -> assert false |
765 |
| TypeDef ty' when coretype_equal ty'.tydef_desc ty.tydef_desc && owner' = owner && itf && (not itf') -> () |
766 |
| _ -> raise (Error (decl.top_decl_loc, Type_mismatch ty.tydef_id))) |
767 |
| _ -> () |
768 |
|
769 |
let check_typedef_compat header = |
770 |
List.iter check_typedef_top header |
771 |
|
772 |
(* Local Variables: *) |
773 |
(* compile-command:"make -C .." *) |
774 |
(* End: *) |