helm/software/matita/contribs/assembly/compiler/linearfe.ma

   1 (**************************************************************************)
   2 (*       ___                                                              *)
   3 (*      ||M||                                                             *)
   4 (*      ||A||       A project by Andrea Asperti                           *)
   5 (*      ||T||                                                             *)
   6 (*      ||I||       Developers:                                           *)
   7 (*      ||T||         The HELM team.                                      *)
   8 (*      ||A||         http://helm.cs.unibo.it                             *)
   9 (*      \   /                                                             *)
  10 (*       \ /        This file is distributed under the terms of the       *)
  11 (*        v         GNU General Public License Version 2                  *)
  12 (*                                                                        *)
  13 (**************************************************************************)
  14
  15 (* ********************************************************************** *)
  16 (*                                                                        *)
  17 (* Sviluppato da:                                                         *)
  18 (*   Cosimo Oliboni, oliboni@cs.unibo.it                                  *)
  19 (*                                                                        *)
  20 (* ********************************************************************** *)
  21
  22 include "compiler/env_to_flatenv.ma".
  23 include "compiler/astfe_tree.ma".
  24
  25 (* ************************************************ *)
  26 (* SUCCESSIONE APPIATITA DI ASSEGNAMENTI SU FLATENV *)
  27 (* ************************************************ *)
  28
  29 inductive jumpLabel : Type ≝
  30   BEGIN_LABEL: jumpLabel
  31 | N_LABEL: nat → jumpLabel
  32 | END_LABEL: jumpLabel.
  33
  34 (*
  35    L1 := goto L1
  36    EXPR L1 L2 := if(EXPR) then { goto L1; } else { goto L2; }
  37 *)
  38 inductive jumpBlock (e:aux_flatEnv_type) : Type ≝
  39   JUMPBLOCK_ABS: jumpLabel → jumpBlock e
  40 | JUMPBLOCK_COND: astfe_base_expr e → jumpLabel → jumpLabel → jumpBlock e.
  41
  42 inductive linearfe_stm (e:aux_flatEnv_type) : Type ≝
  43   LINEARFE_STM_ASG: ∀t:ast_type.
  44                     astfe_var e false t → astfe_expr e t → linearfe_stm e
  45 | LINEARFE_STM_INIT: ∀b:bool.∀t:ast_type.
  46                      astfe_id e b t → astfe_init e t → linearfe_stm e.
  47
  48 (* LABEL + [ init/assegnamenti ] + if(EXPR) then { goto LABEL; } else { goto LABEL; } *)
  49 inductive linearfe_elem (e:aux_flatEnv_type) : Type ≝
  50  LINEARFE_ELEM: jumpLabel → list (linearfe_stm e) → jumpBlock e → linearfe_elem e.
  51
  52 (* -------------------------- *)
  53
  54 definition linearfe_prog ≝ λe.list (linearfe_elem e).
  55
  56 (* -------------------------- *)
  57
  58 (* programma vuoto *)
  59 definition empty_linearfe_prog ≝ nil (linearfe_elem empty_flatEnv).