## lustrec / src / pathConditions.ml @ 3340aff0

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1 | 8446bf03 | ploc | open Lustre_types |
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2 | 40d33d55 | xavier.thirioux | open Corelang |

3 | open Log |
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4 | open Format |
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5 | |||

6 | module IdSet = Set.Make (struct type t = expr * int let compare = compare end) |
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7 | |||

8 | let inout_vars = ref [] |
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9 | |||

10 | 3e1d20e0 | ploc | (* This was used to add inout variables in the final signature. May have to be |

11 | reactivated later *) |
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12 | |||

13 | (* let print_tautology_var fmt v = *) |
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14 | (* match (Types.repr v.var_type).Types.tdesc with *) |
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15 | (* | Types.Tbool -> Format.fprintf fmt "(%s or not %s)" v.var_id v.var_id *) |
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16 | (* | Types.Tint -> Format.fprintf fmt "(%s > 0 or %s <= 0)" v.var_id v.var_id *) |
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17 | (* | Types.Treal -> Format.fprintf fmt "(%s > 0 or %s <= 0)" v.var_id v.var_id *) |
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18 | (* | _ -> Format.fprintf fmt "(true)" *) |
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19 | 40d33d55 | xavier.thirioux | |

20 | 3e1d20e0 | ploc | (* let print_path arg = match !inout_vars with *) |

21 | (* | [] -> Format.printf "%t@." arg *) |
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22 | (* | l -> Format.printf "%t and %a@." arg (Utils.fprintf_list ~sep:" and " (fun fmt elem -> print_tautology_var fmt elem)) l *) |
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23 | 40d33d55 | xavier.thirioux | |

24 | let rel_op = ["="; "!="; "<"; "<="; ">" ; ">=" ] |
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25 | |||

26 | 3e1d20e0 | ploc | (* Used when we were printing the expression directly. Now we are constructing |

27 | them as regular expressions. |
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28 | |||

29 | let rec print_pre fmt nb_pre = if nb_pre <= 0 then () else ( Format.fprintf |
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30 | fmt "pre "; print_pre fmt (nb_pre-1) ) |
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31 | *) |
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32 | |||

33 | let rec mk_pre n e = |
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34 | if n <= 0 then |
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35 | e |
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36 | else |
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37 | mkexpr e.expr_loc (Expr_pre e) |
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38 | |||

39 | 40d33d55 | xavier.thirioux | (* |

40 | 3e1d20e0 | ploc | let combine2 f sub1 sub2 = |

41 | let elem_e1 = List.fold_right IdSet.add (List.map fst sub1) IdSet.empty in |
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42 | let elem_e2 = List.fold_right IdSet.add (List.map fst sub2) IdSet.empty in |
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43 | let common = IdSet.inter elem_e1 elem_e2 in |
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44 | let sub1_filtered = List.filter (fun (v, _) -> not (IdSet.mem v common)) sub1 in |
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45 | let sub2_filtered = List.filter (fun (v, _) -> not (IdSet.mem v common)) sub2 in |
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46 | (List.map (fun (v, negv) -> (v, f negv e2)) sub1_filtered) @ |
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47 | (List.map (fun (v, negv) -> (v, f e1 negv)) sub2_filtered) @ |
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48 | (List.map (fun v -> (v, {expr with expr_desc = Expr_arrow(List.assoc v sub1, List.assoc v sub2)}) (IdSet.elements common)) ) |
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49 | 40d33d55 | xavier.thirioux | *) |

50 | |||

51 | let rec select (v: expr * int) (active: bool list) (modified: ((expr * int) * expr) list list) (orig: expr list) = |
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52 | match active, modified, orig with |
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53 | | true::active_tl, e::modified_tl, _::orig_tl -> (List.assoc v e)::(select v active_tl modified_tl orig_tl) |
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54 | | false::active_tl, _::modified_tl, e::orig_tl -> e::(select v active_tl modified_tl orig_tl) |
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55 | | [], [], [] -> [] |
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56 | | _ -> assert false |
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57 | |||

58 | let combine (f: expr list -> expr ) subs orig : ((expr * int) * expr) list = |
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59 | let elems = List.map (fun sub_i -> List.fold_right IdSet.add (List.map fst sub_i) IdSet.empty) subs in |
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60 | let all = List.fold_right IdSet.union elems IdSet.empty in |
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61 | List.map (fun v -> |
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62 | let active_subs = List.map (IdSet.mem v) elems in |
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63 | v, f (select v active_subs subs orig) |
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64 | ) (IdSet.elements all) |
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65 | |||

66 | 3e1d20e0 | ploc | |

67 | (* In a previous version, the printer was introducing fake description, ie |
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68 | tautologies, over inout variables to make sure they were not suppresed by |
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69 | some other algorithms *) |
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70 | |||

71 | (* Takes the variable on which these coverage criteria will apply, as well as |
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72 | the expression and its negated version. Returns the expr and the variable |
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73 | expression, as well as the two new boolean expressions descibing the two |
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74 | associated modes. *) |
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75 | let mcdc_var vi_as_expr expr expr_neg_vi = |
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76 | let loc = expr.expr_loc in |
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77 | let changed_expr = mkpredef_call loc "!=" [expr; expr_neg_vi] in |
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78 | let not_vi_as_expr = mkpredef_call loc "not" [vi_as_expr] in |
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79 | let expr1 = mkpredef_call loc "&&" [vi_as_expr; changed_expr] in |
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80 | let expr2 = mkpredef_call loc "&&" [not_vi_as_expr; changed_expr] in |
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81 | 8cacf677 | ploc | ((expr,vi_as_expr),[(true,expr1);(false,expr2)]) (* expr1 corresponds to atom |

82 | true while expr2 |
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83 | corresponds to atom |
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84 | false *) |
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85 | 3e1d20e0 | ploc | |

86 | (* Format.printf "%a@." Printers.pp_expr expr1; *) |
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87 | (* print_path (fun fmt -> Format.fprintf fmt "%a and (%a != %a)" *) |
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88 | (* Printers.pp_expr vi_as_expr *) |
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89 | (* Printers.pp_expr expr (\*v*\) *) |
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90 | (* Printers.pp_expr expr_neg_vi); *) |
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91 | (* Format.printf "%a@." Printers.pp_expr expr2; *) |
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92 | (* print_path (fun fmt -> Format.fprintf fmt "(not %a) and (%a != %a)" *) |
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93 | (* Printers.pp_expr vi_as_expr *) |
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94 | (* Printers.pp_expr expr (\*v*\) *) |
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95 | (* Printers.pp_expr expr_neg_vi) *) |
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96 | |||

97 | 8446bf03 | ploc | let rec compute_neg_expr cpt_pre (expr: Lustre_types.expr) = |

98 | 3e1d20e0 | ploc | let neg_list l = |

99 | List.fold_right (fun e (vl,el) -> let vl', e' = compute_neg_expr cpt_pre e in (vl'@vl), e'::el) l ([], []) |
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100 | in |
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101 | 40d33d55 | xavier.thirioux | match expr.expr_desc with |

102 | | Expr_tuple l -> |
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103 | 3e1d20e0 | ploc | let vl, neg = neg_list l in |

104 | vl, combine (fun l' -> {expr with expr_desc = Expr_tuple l'}) neg l |
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105 | |||

106 | 66359a5e | ploc | | Expr_ite (i,t,e) when (Types.is_bool_type t.expr_type) -> ( |

107 | 40d33d55 | xavier.thirioux | let list = [i; t; e] in |

108 | 3e1d20e0 | ploc | let vl, neg = neg_list list in |

109 | vl, combine (fun l -> |
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110 | 2fdbc781 | ploc | match l with |

111 | | [i'; t'; e'] -> {expr with expr_desc = Expr_ite(i', t', e')} |
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112 | | _ -> assert false |
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113 | ) neg list |
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114 | ) |
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115 | 40d33d55 | xavier.thirioux | | Expr_ite (i,t,e) -> ( (* We return the guard as a new guard *) |

116 | 3e1d20e0 | ploc | let vl = gen_mcdc_cond_guard i in |

117 | 40d33d55 | xavier.thirioux | let list = [i; t; e] in |

118 | 3e1d20e0 | ploc | let vl', neg = neg_list list in |

119 | vl@vl', combine (fun l -> |
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120 | 2fdbc781 | ploc | match l with |

121 | | [i'; t'; e'] -> {expr with expr_desc = Expr_ite(i', t', e')} |
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122 | | _ -> assert false |
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123 | ) neg list |
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124 | 40d33d55 | xavier.thirioux | ) |

125 | | Expr_arrow (e1, e2) -> |
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126 | 3e1d20e0 | ploc | let vl1, e1' = compute_neg_expr cpt_pre e1 in |

127 | let vl2, e2' = compute_neg_expr cpt_pre e2 in |
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128 | vl1@vl2, combine (fun l -> match l with |
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129 | | [x;y] -> { expr with expr_desc = Expr_arrow (x, y) } |
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130 | | _ -> assert false |
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131 | ) [e1'; e2'] [e1; e2] |
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132 | |||

133 | | Expr_pre e -> |
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134 | let vl, e' = compute_neg_expr (cpt_pre+1) e in |
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135 | vl, List.map |
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136 | (fun (v, negv) -> (v, { expr with expr_desc = Expr_pre negv } )) e' |
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137 | 40d33d55 | xavier.thirioux | |

138 | | Expr_appl (op_name, args, r) when List.mem op_name rel_op -> |
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139 | 3e1d20e0 | ploc | [], [(expr, cpt_pre), mkpredef_call expr.expr_loc "not" [expr]] |

140 | 40d33d55 | xavier.thirioux | |

141 | 3e1d20e0 | ploc | | Expr_appl (op_name, args, r) -> |

142 | let vl, args' = compute_neg_expr cpt_pre args in |
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143 | vl, List.map |
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144 | (fun (v, negv) -> (v, { expr with expr_desc = Expr_appl (op_name, negv, r) } )) |
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145 | args' |
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146 | 40d33d55 | xavier.thirioux | |

147 | 66359a5e | ploc | | Expr_ident _ when (Types.is_bool_type expr.expr_type) -> |

148 | 3e1d20e0 | ploc | [], [(expr, cpt_pre), mkpredef_call expr.expr_loc "not" [expr]] |

149 | | _ -> [] (* empty vars *) , [] |
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150 | and gen_mcdc_cond_var v expr = |
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151 | report ~level:1 (fun fmt -> |
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152 | Format.fprintf fmt ".. Generating MC/DC cond for boolean flow %s and expression %a@." |
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153 | v |
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154 | Printers.pp_expr expr); |
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155 | let vl, leafs_n_neg_expr = compute_neg_expr 0 expr in |
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156 | ff6ba54e | ploc | if List.length leafs_n_neg_expr >= 1 then ( |

157 | 3e1d20e0 | ploc | List.fold_left (fun accu ((vi, nb_pre), expr_neg_vi) -> |

158 | (mcdc_var (mk_pre nb_pre vi) expr expr_neg_vi)::accu |
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159 | ) vl leafs_n_neg_expr |
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160 | 40d33d55 | xavier.thirioux | ) |

161 | ff6ba54e | ploc | else |

162 | (* TODO: deal with the case length xxx = 1 with a simpler condition *) |
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163 | vl |
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164 | 40d33d55 | xavier.thirioux | |

165 | and gen_mcdc_cond_guard expr = |
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166 | 3e1d20e0 | ploc | report ~level:1 (fun fmt -> |

167 | Format.fprintf fmt".. Generating MC/DC cond for guard %a@." |
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168 | Printers.pp_expr expr); |
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169 | let vl, leafs_n_neg_expr = compute_neg_expr 0 expr in |
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170 | ff6ba54e | ploc | if List.length leafs_n_neg_expr >= 1 then ( |

171 | 3e1d20e0 | ploc | List.fold_left (fun accu ((vi, nb_pre), expr_neg_vi) -> |

172 | (mcdc_var (mk_pre nb_pre vi) expr expr_neg_vi)::accu |
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173 | ) vl leafs_n_neg_expr) |
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174 | else |
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175 | ff6ba54e | ploc | (* TODO: deal with the case length xxx = 1 with a simpler condition *) |

176 | 3e1d20e0 | ploc | vl |

177 | 40d33d55 | xavier.thirioux | |

178 | |||

179 | let rec mcdc_expr cpt_pre expr = |
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180 | match expr.expr_desc with |
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181 | 3e1d20e0 | ploc | | Expr_tuple l -> |

182 | let vl = |
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183 | List.fold_right (fun e accu_v -> |
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184 | let vl = mcdc_expr cpt_pre e in |
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185 | (vl@accu_v)) |
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186 | l |
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187 | [] |
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188 | in |
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189 | vl |
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190 | | Expr_ite (i,t,e) -> |
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191 | let vl_i = gen_mcdc_cond_guard i in |
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192 | let vl_t = mcdc_expr cpt_pre t in |
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193 | let vl_e = mcdc_expr cpt_pre e in |
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194 | vl_i@vl_t@vl_e |
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195 | | Expr_arrow (e1, e2) -> |
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196 | let vl1 = mcdc_expr cpt_pre e1 in |
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197 | let vl2 = mcdc_expr cpt_pre e2 in |
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198 | vl1@vl2 |
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199 | | Expr_pre e -> |
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200 | let vl = mcdc_expr (cpt_pre+1) e in |
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201 | vl |
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202 | | Expr_appl (f, args, r) -> |
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203 | let vl = mcdc_expr cpt_pre args in |
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204 | vl |
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205 | | _ -> [] |
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206 | 40d33d55 | xavier.thirioux | |

207 | let mcdc_var_def v expr = |
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208 | 66359a5e | ploc | if Types.is_bool_type expr.expr_type then |

209 | 3e1d20e0 | ploc | let vl = gen_mcdc_cond_var v expr in |

210 | vl |
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211 | 66359a5e | ploc | else |

212 | let vl = mcdc_expr 0 expr in |
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213 | vl |
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214 | |||

215 | 40d33d55 | xavier.thirioux | let mcdc_node_eq eq = |

216 | 3e1d20e0 | ploc | let vl = |

217 | 66359a5e | ploc | match eq.eq_lhs, Types.is_bool_type eq.eq_rhs.expr_type, (Types.repr eq.eq_rhs.expr_type).Types.tdesc, eq.eq_rhs.expr_desc with |

218 | 8cacf677 | ploc | | [lhs], true, _, _ -> gen_mcdc_cond_var lhs eq.eq_rhs |

219 | 66359a5e | ploc | | _::_, false, Types.Ttuple tl, Expr_tuple rhs -> |

220 | 3e1d20e0 | ploc | (* We iterate trough pairs, but accumulate variables aside. The resulting |

221 | expression shall remain a tuple defintion *) |
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222 | let vl = List.fold_right2 (fun lhs rhs accu -> |
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223 | let v = mcdc_var_def lhs rhs in |
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224 | (* we don't care about the expression it. We focus on the coverage |
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225 | expressions in v *) |
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226 | v@accu |
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227 | ) eq.eq_lhs rhs [] |
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228 | in |
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229 | vl |
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230 | | _ -> mcdc_expr 0 eq.eq_rhs |
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231 | in |
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232 | vl |
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233 | 40d33d55 | xavier.thirioux | |

234 | bde99c3f | xavier.thirioux | let mcdc_node_stmt stmt = |

235 | match stmt with |
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236 | 3e1d20e0 | ploc | | Eq eq -> let vl = mcdc_node_eq eq in vl |

237 | bde99c3f | xavier.thirioux | | Aut aut -> assert false |

238 | |||

239 | 40d33d55 | xavier.thirioux | let mcdc_top_decl td = |

240 | match td.top_decl_desc with |
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241 | 3e1d20e0 | ploc | | Node nd -> |

242 | let new_coverage_exprs = |
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243 | List.fold_right ( |
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244 | 8cacf677 | ploc | fun s accu_v -> |

245 | 3e1d20e0 | ploc | let vl' = mcdc_node_stmt s in |

246 | vl'@accu_v |
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247 | 8cacf677 | ploc | ) nd.node_stmts [] |

248 | 3e1d20e0 | ploc | in |

249 | 8cacf677 | ploc | (* We add coverage vars as boolean internal flows. *) |

250 | let fresh_cov_defs = List.flatten (List.map (fun ((_, atom), expr_l) -> List.map (fun (atom_valid, case) -> atom, atom_valid, case) expr_l) new_coverage_exprs) in |
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251 | 3e1d20e0 | ploc | let nb_total = List.length fresh_cov_defs in |

252 | 8cacf677 | ploc | let fresh_cov_vars = List.mapi (fun i (atom, atom_valid, cov_expr) -> |

253 | let loc = cov_expr.expr_loc in |
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254 | Format.fprintf Format.str_formatter "__cov_%i_%i" i nb_total; |
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255 | let cov_id = Format.flush_str_formatter () in |
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256 | let cov_var = mkvar_decl loc |
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257 | (cov_id, mktyp loc Tydec_bool, mkclock loc Ckdec_any, false, None, None) in |
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258 | let cov_def = Eq (mkeq loc ([cov_id], cov_expr)) in |
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259 | cov_var, cov_def, atom, atom_valid |
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260 | ) fresh_cov_defs |
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261 | 3e1d20e0 | ploc | in |

262 | 66359a5e | ploc | let fresh_vars, fresh_eqs = |

263 | List.fold_right |
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264 | 8cacf677 | ploc | (fun (v,eq,_,_) (accuv, accueq)-> v::accuv, eq::accueq ) |

265 | 66359a5e | ploc | fresh_cov_vars |

266 | ([], []) |
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267 | in |
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268 | let fresh_annots = (* We produce two sets of annotations: PROPERTY ones for |
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269 | kind2, and regular ones to keep track of the nature |
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270 | of the annotations. *) |
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271 | 3e1d20e0 | ploc | List.map |

272 | 8cacf677 | ploc | (fun (v, _, atom, atom_valid) -> |

273 | let e = expr_of_vdecl v in |
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274 | let ee = expr_to_eexpr e in |
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275 | let neg_ee = expr_to_eexpr (mkpredef_call e.expr_loc "not" [e]) in |
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276 | {annots = [["PROPERTY"], neg_ee; (* Using negated property to force |
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277 | model-checker to produce a |
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278 | suitable covering trace *) |
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279 | let _ = Printers.pp_expr Format.str_formatter atom in |
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280 | let atom_as_string = Format.flush_str_formatter () in |
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281 | let valid = if atom_valid then "true" else "false" in |
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282 | ["coverage";"mcdc";atom_as_string;valid], ee |
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283 | ]; |
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284 | annot_loc = v.var_loc}) |
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285 | fresh_cov_vars |
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286 | 66359a5e | ploc | in |

287 | Format.printf "%i coverage criteria generated for node %s@ " nb_total nd.node_id; |
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288 | 3e1d20e0 | ploc | (* And add them as annotations --%PROPERTY: var TODO *) |

289 | {td with top_decl_desc = Node {nd with |
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290 | 8cacf677 | ploc | node_locals = nd.node_locals@fresh_vars; |

291 | node_stmts = nd.node_stmts@fresh_eqs; |
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292 | node_annot = nd.node_annot@fresh_annots |
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293 | }} |
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294 | 3e1d20e0 | ploc | | _ -> td |

295 | 40d33d55 | xavier.thirioux | |

296 | |||

297 | let mcdc prog = |
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298 | (* If main node is provided add silly constraints to show in/out variables in the path condition *) |
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299 | if !Options.main_node <> "" then ( |
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300 | inout_vars := |
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301 | let top = List.find |
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302 | (fun td -> |
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303 | match td.top_decl_desc with |
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304 | | Node nd when nd.node_id = !Options.main_node -> true |
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305 | | _ -> false) |
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306 | prog |
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307 | in |
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308 | match top.top_decl_desc with |
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309 | | Node nd -> nd.node_inputs @ nd.node_outputs |
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310 | | _ -> assert false); |
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311 | 3e1d20e0 | ploc | List.map mcdc_top_decl prog |

312 | 40d33d55 | xavier.thirioux | |

313 | 66359a5e | ploc | |

314 | |||

315 | 40d33d55 | xavier.thirioux | (* Local Variables: *) |

316 | (* compile-command:"make -C .." *) |
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317 | (* End: *) |
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318 | |||

319 |