1 (**************************************************************************)
4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
8 (* ||A|| http://helm.cs.unibo.it *)
10 (* \ / This file is distributed under the terms of the *)
11 (* v GNU General Public License Version 2 *)
13 (**************************************************************************)
15 (* ********************************************************************** *)
18 (* Cosimo Oliboni, oliboni@cs.unibo.it *)
20 (* ********************************************************************** *)
22 include "compiler/preast_tree.ma".
23 include "compiler/ast_tree.ma".
24 include "compiler/sigma.ma".
26 (* ************************* *)
27 (* PASSO 1 : da PREAST a AST *)
28 (* ************************* *)
30 lemma pippo : ∀t1,t2:ast_base_type.
31 (eq_ast_base_type t1 t2 = true) → (t1 = t2).
32 unfold eq_ast_base_type;
42 PREAST_EXPR_BYTE8 : byte8 → preast_expr
43 PREAST_EXPR_WORD16: word16 → preast_expr
44 PREAST_EXPR_WORD32: word32 → preast_expr
45 PREAST_EXPR_NEG: preast_expr → preast_expr
46 PREAST_EXPR_NOT: preast_expr → preast_expr
47 PREAST_EXPR_COM: preast_expr → preast_expr
48 PREAST_EXPR_ADD: preast_expr → preast_expr → preast_expr
49 PREAST_EXPR_SUB: preast_expr → preast_expr → preast_expr
50 PREAST_EXPR_MUL: preast_expr → preast_expr → preast_expr
51 PREAST_EXPR_DIV: preast_expr → preast_expr → preast_expr
52 PREAST_EXPR_SHR: preast_expr → preast_expr → preast_expr
53 PREAST_EXPR_SHL: preast_expr → preast_expr → preast_expr
54 PREAST_EXPR_GT : preast_expr → preast_expr → preast_expr
55 PREAST_EXPR_GTE: preast_expr → preast_expr → preast_expr
56 PREAST_EXPR_LT : preast_expr → preast_expr → preast_expr
57 PREAST_EXPR_LTE: preast_expr → preast_expr → preast_expr
58 PREAST_EXPR_EQ : preast_expr → preast_expr → preast_expr
59 PREAST_EXPR_NEQ: preast_expr → preast_expr → preast_expr
60 PREAST_EXPR_B8toW16 : preast_expr → preast_expr
61 PREAST_EXPR_B8toW32 : preast_expr → preast_expr
62 PREAST_EXPR_W16toB8 : preast_expr → preast_expr
63 PREAST_EXPR_W16toW32: preast_expr → preast_expr
64 PREAST_EXPR_W32toB8 : preast_expr → preast_expr
65 PREAST_EXPR_W32toW16: preast_expr → preast_expr
66 PREAST_EXPR_ID: preast_var → preast_expr
68 definition preast_to_ast_expr_check ≝
69 λe:aux_env_type.λv:Σt'.ast_expr e t'.λt:ast_base_type.
71 [ sigma_intro t' expr ⇒
72 match eq_ast_base_type t' t
73 return λb.eq_ast_base_type t' t = b → option (ast_expr e t)
75 [ true ⇒ λp.Some ? (eq_rect ? t' (λt.ast_expr e t) expr t (pippo ?? p))
77 ] (refl_eq ? (eq_ast_base_type t' t))
80 let rec preast_to_ast_expr (preast:preast_expr) (e:aux_env_type) on preast : option (Σt:ast_base_type.ast_expr e t) ≝
82 (* in pretty print diventa Some ? "≪AST_BASE_TYPE_BYTE8,AST_EXPR_BYTE8 e val≫" *)
83 [ PREAST_EXPR_BYTE8 val ⇒ Some ? ≪AST_BASE_TYPE_BYTE8, AST_EXPR_BYTE8 e val≫
84 | PREAST_EXPR_WORD16 val ⇒ Some ? ≪AST_BASE_TYPE_WORD16, AST_EXPR_WORD16 e val≫
85 | PREAST_EXPR_WORD32 val ⇒ Some ? ≪AST_BASE_TYPE_WORD32, AST_EXPR_WORD32 e val≫
86 | PREAST_EXPR_NEG subExpr ⇒
87 opt_map ?? (preast_to_ast_expr subExpr e)
88 (λsigmaRes:Σt:ast_base_type.ast_expr e t.Some ? ≪sigmaFst ?? sigmaRes, AST_EXPR_NEG e (sigmaFst ?? sigmaRes) (sigmaSnd ?? sigmaRes)≫)
89 | PREAST_EXPR_NOT subExpr ⇒
90 opt_map ?? (preast_to_ast_expr subExpr e)
91 (λsigmaRes:Σt:ast_base_type.ast_expr e t.Some ? ≪sigmaFst ?? sigmaRes, AST_EXPR_NOT e (sigmaFst ?? sigmaRes) (sigmaSnd ?? sigmaRes)≫)
92 | PREAST_EXPR_COM subExpr ⇒
93 opt_map ?? (preast_to_ast_expr subExpr e)
94 (λsigmaRes:Σt:ast_base_type.ast_expr e t.Some ? ≪sigmaFst ?? sigmaRes, AST_EXPR_COM e (sigmaFst ?? sigmaRes) (sigmaSnd ?? sigmaRes)≫)
95 | PREAST_EXPR_ADD subExpr1 subExpr2 ⇒
96 opt_map ?? (preast_to_ast_expr subExpr1 e)
97 (λsigmaRes1:Σt:ast_base_type.ast_expr e t.opt_map ?? (preast_to_ast_expr subExpr2 e)
98 (λsigmaRes2.opt_map ?? (preast_to_ast_expr_check e sigmaRes2 (sigmaFst ?? sigmaRes1))
99 (λres2.Some ? (≪sigmaFst ?? sigmaRes1,AST_EXPR_ADD e (sigmaFst ?? sigmaRes1) (sigmaSnd ?? sigmaRes1) res2≫))))
104 PREAST_VAR_ID: aux_str_type → preast_var
105 PREAST_VAR_ARRAY: preast_var → preast_expr → preast_var
106 PREAST_VAR_STRUCT: preast_var → nat → preast_var.
108 and preast_to_ast_var (preast:preast_var) (e:aux_env_type) on preast : option (Σb:bool.Σt:ast_type.ast_var e b t) ≝
112 PREAST_INIT_VAL_BYTE8: byte8 → preast_init_val
113 PREAST_INIT_VAL_WORD16: word16 → preast_init_val
114 PREAST_INIT_VAL_WORD32: word32 → preast_init_val
115 PREAST_INIT_VAL_ARRAY: ne_list preast_init_val → preast_init_val
116 PREAST_INIT_VAL_STRUCT: ne_list preast_init_val → preast_init_val.
118 let rec preast_to_ast_init_val (preast:preast_init_val) (e:aux_env_type) on preast : option (sigma ast_type (ast_init e)) ≝
122 PREAST_INIT_VAR: preast_var → preast_init
123 PREAST_INIT_VAL: preast_init_val → preast_init.
125 definition preast_to_ast_init : preast_init → Πe:aux_env_type.option (sigma ast_type (ast_init e)) ≝
126 λpreast:preast_init.λe:aux_env_type.None ?.
129 PREAST_STM_ASG: preast_var → preast_expr → preast_stm
130 PREAST_STM_WHILE: preast_expr → preast_decl → preast_stm
131 PREAST_STM_IF: ne_list (Prod preast_expr preast_decl) → option preast_decl → preast_stm
133 let rec preast_to_ast_stm (preast:preast_stm) (e:aux_env_type) on preast : option (ast_stm e) ≝
136 PREAST_NO_DECL: list preast_stm → preast_decl
137 PREAST_DECL: bool → aux_str_type → ast_type → option preast_expr → preast_decl → preast_decl.
139 and preast_to_ast_decl (preast:preast_decl) (e:aux_env_type) on preast : option (ast_decl e) ≝
143 PREAST_ROOT: preast_decl → preast_root.
145 definition preast_to_ast ≝
146 λpreast:preast_root.match preast with
147 [ PREAST_ROOT decl ⇒ opt_map ?? (preast_to_ast_decl decl empty_env)
148 (λres.Some ? (AST_ROOT res)) ].