(* *********************************************************************)
(*                                                                     *)
(*              The Compcert verified compiler                         *)
(*                                                                     *)
(*          Xavier Leroy, Collège de France and Inria Paris            *)
(*                                                                     *)
(*  Copyright Institut National de Recherche en Informatique et en     *)
(*  Automatique.  All rights reserved.  This file is distributed       *)
(*  under the terms of the GNU General Public License as published by  *)
(*  the Free Software Foundation, either version 2 of the License, or  *)
(*  (at your option) any later version.  This file is also distributed *)
(*  under the terms of the INRIA Non-Commercial License Agreement.     *)
(*                                                                     *)
(* *********************************************************************)
(** Known built-in functions *)
Require Export Builtins0 Builtins1.
Inductive builtin_function : Type :=
| BI_standard (b: standard_builtin)
| BI_platform (b: platform_builtin).
Definition builtin_function_sig (b: builtin_function) : signature :=
match b with
| BI_standard b => standard_builtin_sig b
| BI_platform b => platform_builtin_sig b
end.
Definition builtin_function_sem (b: builtin_function) : builtin_sem (sig_res (builtin_function_sig b)) :=
match b with
| BI_standard b => standard_builtin_sem b
| BI_platform b => platform_builtin_sem b
end.
Definition lookup_builtin_function (name: string) (sg: signature) : option builtin_function :=
match lookup_builtin standard_builtin_sig name sg standard_builtin_table with
| Some b => Some (BI_standard b)
| None =>
match lookup_builtin platform_builtin_sig name sg platform_builtin_table with
| Some b => Some (BI_platform b)
| None => None
end end.

Lemma lookup_builtin_function_sig:
forall name sg b, lookup_builtin_function name sg = Some b -> builtin_function_sig b = sg.