## lustrec / src / types.ml @ 45c13277

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1 | a2d97a3e | ploc | (********************************************************************) |
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2 | (* *) |
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3 | (* The LustreC compiler toolset / The LustreC Development Team *) |
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4 | (* Copyright 2012 - -- ONERA - CNRS - INPT - LIFL *) |
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5 | (* *) |
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6 | (* LustreC is free software, distributed WITHOUT ANY WARRANTY *) |
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7 | (* under the terms of the GNU Lesser General Public License *) |
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8 | (* version 2.1. *) |
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9 | (* *) |
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10 | (* This file was originally from the Prelude compiler *) |
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11 | (* *) |
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12 | (********************************************************************) |
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13 | 22fe1c93 | ploc | |

14 | (** Types definitions and a few utility functions on types. *) |
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15 | open Utils |
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16 | open Dimension |
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17 | |||

18 | type type_expr = |
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19 | {mutable tdesc: type_desc; |
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20 | tid: int} |
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21 | |||

22 | and type_desc = |
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23 | | Tconst of ident (* type constant *) |
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24 | | Tint |
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25 | | Treal |
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26 | | Tbool |
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27 | | Trat (* Actually unused for now. Only place where it can appear is |
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28 | in a clock declaration *) |
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29 | 6afa892a | xthirioux | | Tclock of type_expr (* A type expression explicitely tagged as carrying a clock *) |

30 | 22fe1c93 | ploc | | Tarrow of type_expr * type_expr |

31 | | Ttuple of type_expr list |
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32 | | Tenum of ident list |
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33 | 12af4908 | xthirioux | | Tstruct of (ident * type_expr) list |

34 | 22fe1c93 | ploc | | Tarray of dim_expr * type_expr |

35 | | Tstatic of dim_expr * type_expr (* a type carried by a dimension expression *) |
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36 | | Tlink of type_expr (* During unification, make links instead of substitutions *) |
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37 | | Tvar (* Monomorphic type variable *) |
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38 | | Tunivar (* Polymorphic type variable *) |
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39 | |||

40 | type error = |
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41 | Unbound_value of ident |
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42 | | Already_bound of ident |
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43 | | Already_defined of ident |
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44 | | Undefined_var of (unit IMap.t) |
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45 | 96f5fe18 | xthirioux | | Declared_but_undefined of ident |

46 | 22fe1c93 | ploc | | Unbound_type of ident |

47 | | Not_a_dimension |
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48 | | Not_a_constant |
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49 | 6afa892a | xthirioux | | Assigned_constant of ident |

50 | 22fe1c93 | ploc | | WrongArity of int * int |

51 | b616fe7a | xthirioux | | WrongMorphism of int * int |

52 | 22fe1c93 | ploc | | Type_clash of type_expr * type_expr |

53 | | Poly_imported_node of ident |
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54 | |||

55 | exception Unify of type_expr * type_expr |
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56 | exception Error of Location.t * error |
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57 | |||

58 | (* Pretty-print*) |
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59 | open Format |
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60 | 12af4908 | xthirioux | |

61 | let rec print_struct_ty_field fmt (label, ty) = |
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62 | fprintf fmt "%a : %a" pp_print_string label print_ty ty |
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63 | and print_ty fmt ty = |
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64 | 22fe1c93 | ploc | match ty.tdesc with |

65 | | Tvar -> |
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66 | fprintf fmt "_%s" (name_of_type ty.tid) |
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67 | | Tint -> |
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68 | fprintf fmt "int" |
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69 | | Treal -> |
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70 | fprintf fmt "real" |
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71 | | Tbool -> |
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72 | fprintf fmt "bool" |
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73 | | Tclock t -> |
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74 | fprintf fmt "%a clock" print_ty t |
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75 | | Tstatic (d, t) -> |
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76 | fprintf fmt "(%a:%a)" Dimension.pp_dimension d print_ty t |
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77 | | Tconst t -> |
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78 | fprintf fmt "%s" t |
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79 | | Trat -> |
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80 | fprintf fmt "rat" |
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81 | | Tarrow (ty1,ty2) -> |
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82 | 719f9992 | xthirioux | fprintf fmt "%a -> %a" print_ty ty1 print_ty ty2 |

83 | 22fe1c93 | ploc | | Ttuple tylist -> |

84 | fprintf fmt "(%a)" |
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85 | (Utils.fprintf_list ~sep:"*" print_ty) tylist |
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86 | | Tenum taglist -> |
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87 | 12af4908 | xthirioux | fprintf fmt "enum {%a }" |

88 | (Utils.fprintf_list ~sep:", " pp_print_string) taglist |
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89 | | Tstruct fieldlist -> |
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90 | fprintf fmt "struct {%a }" |
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91 | (Utils.fprintf_list ~sep:"; " print_struct_ty_field) fieldlist |
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92 | 22fe1c93 | ploc | | Tarray (e, ty) -> |

93 | fprintf fmt "%a^%a" print_ty ty Dimension.pp_dimension e |
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94 | | Tlink ty -> |
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95 | print_ty fmt ty |
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96 | | Tunivar -> |
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97 | fprintf fmt "'%s" (name_of_type ty.tid) |
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98 | |||

99 | 12af4908 | xthirioux | let rec print_node_struct_ty_field fmt (label, ty) = |

100 | fprintf fmt "%a : %a" pp_print_string label print_node_ty ty |
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101 | and print_node_ty fmt ty = |
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102 | 7291cb80 | xthirioux | match ty.tdesc with |

103 | 96f5fe18 | xthirioux | | Tvar -> begin |

104 | b35da910 | xthirioux | (*Format.eprintf "DEBUG:Types.print_node@.";*) |

105 | 96f5fe18 | xthirioux | fprintf fmt "_%s" (name_of_type ty.tid) |

106 | end |
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107 | 7291cb80 | xthirioux | | Tint -> |

108 | fprintf fmt "int" |
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109 | | Treal -> |
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110 | fprintf fmt "real" |
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111 | | Tbool -> |
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112 | fprintf fmt "bool" |
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113 | | Tclock t -> |
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114 | 6afa892a | xthirioux | fprintf fmt "%a clock" print_node_ty t |

115 | 7291cb80 | xthirioux | | Tstatic (_, t) -> |

116 | fprintf fmt "%a" print_node_ty t |
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117 | | Tconst t -> |
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118 | fprintf fmt "%s" t |
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119 | | Trat -> |
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120 | fprintf fmt "rat" |
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121 | | Tarrow (ty1,ty2) -> |
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122 | 6afa892a | xthirioux | fprintf fmt "%a -> %a" print_node_ty ty1 print_node_ty ty2 |

123 | 7291cb80 | xthirioux | | Ttuple tylist -> |

124 | fprintf fmt "(%a)" |
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125 | 6afa892a | xthirioux | (Utils.fprintf_list ~sep:"*" print_node_ty) tylist |

126 | 7291cb80 | xthirioux | | Tenum taglist -> |

127 | 12af4908 | xthirioux | fprintf fmt "enum {%a }" |

128 | (Utils.fprintf_list ~sep:", " pp_print_string) taglist |
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129 | | Tstruct fieldlist -> |
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130 | fprintf fmt "struct {%a }" |
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131 | (Utils.fprintf_list ~sep:"; " print_node_struct_ty_field) fieldlist |
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132 | 7291cb80 | xthirioux | | Tarray (e, ty) -> |

133 | 6afa892a | xthirioux | fprintf fmt "%a^%a" print_node_ty ty Dimension.pp_dimension e |

134 | 7291cb80 | xthirioux | | Tlink ty -> |

135 | 6afa892a | xthirioux | print_node_ty fmt ty |

136 | 7291cb80 | xthirioux | | Tunivar -> |

137 | fprintf fmt "'%s" (name_of_type ty.tid) |
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138 | |||

139 | 22fe1c93 | ploc | let pp_error fmt = function |

140 | | Unbound_value id -> |
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141 | fprintf fmt "Unknown value %s@." id |
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142 | | Unbound_type id -> |
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143 | fprintf fmt "Unknown type %s@." id |
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144 | | Already_bound id -> |
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145 | fprintf fmt "%s is already declared@." id |
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146 | | Already_defined id -> |
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147 | fprintf fmt "Multiple definitions of variable %s@." id |
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148 | | Not_a_constant -> |
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149 | fprintf fmt "This expression is not a constant@." |
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150 | 6afa892a | xthirioux | | Assigned_constant id -> |

151 | fprintf fmt "The constant %s cannot be assigned@." id |
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152 | 22fe1c93 | ploc | | Not_a_dimension -> |

153 | fprintf fmt "This expression is not a valid dimension@." |
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154 | | WrongArity (ar1, ar2) -> |
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155 | fprintf fmt "Expecting %d argument(s), found %d@." ar1 ar2 |
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156 | b616fe7a | xthirioux | | WrongMorphism (ar1, ar2) -> |

157 | fprintf fmt "Expecting %d argument(s) for homomorphic extension, found %d@." ar1 ar2 |
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158 | 22fe1c93 | ploc | | Undefined_var vmap -> |

159 | fprintf fmt "No definition provided for variable(s): %a@." |
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160 | (Utils.fprintf_list ~sep:"," pp_print_string) |
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161 | (fst (Utils.list_of_imap vmap)) |
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162 | 96f5fe18 | xthirioux | | Declared_but_undefined id -> |

163 | fprintf fmt "Node %s is declared but not defined@." id |
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164 | 22fe1c93 | ploc | | Type_clash (ty1,ty2) -> |

165 | Utils.reset_names (); |
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166 | fprintf fmt "Expected type %a, got type %a@." print_ty ty1 print_ty ty2 |
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167 | | Poly_imported_node id -> |
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168 | fprintf fmt "Imported nodes cannot have a polymorphic type@." |
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169 | |||

170 | |||

171 | let new_id = ref (-1) |
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172 | |||

173 | let new_ty desc = |
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174 | incr new_id; {tdesc = desc; tid = !new_id } |
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175 | |||

176 | let new_var () = |
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177 | new_ty Tvar |
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178 | |||

179 | let new_univar () = |
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180 | new_ty Tunivar |
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181 | |||

182 | let rec repr = |
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183 | function |
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184 | {tdesc = Tlink t'} -> |
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185 | repr t' |
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186 | | t -> t |
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187 | |||

188 | let get_static_value ty = |
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189 | 12af4908 | xthirioux | match (repr ty).tdesc with |

190 | | Tstatic (d, _) -> Some d |
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191 | | _ -> None |
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192 | |||

193 | let get_field_type ty label = |
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194 | match (repr ty).tdesc with |
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195 | | Tstruct fl -> (try Some (List.assoc label fl) with Not_found -> None) |
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196 | | _ -> None |
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197 | 22fe1c93 | ploc | |

198 | 6afa892a | xthirioux | let is_numeric_type ty = |

199 | match (repr ty).tdesc with |
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200 | | Tint |
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201 | | Treal -> true |
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202 | | _ -> false |
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203 | |||

204 | let is_bool_type ty = |
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205 | match (repr ty).tdesc with |
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206 | | Tbool -> true |
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207 | | _ -> false |
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208 | |||

209 | let get_clock_base_type ty = |
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210 | 8f1c7e91 | xthirioux | match (repr ty).tdesc with |

211 | 6afa892a | xthirioux | | Tclock ty -> Some ty |

212 | | _ -> None |
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213 | 8f1c7e91 | xthirioux | |

214 | 22fe1c93 | ploc | let rec is_dimension_type ty = |

215 | match (repr ty).tdesc with |
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216 | | Tint |
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217 | | Tbool -> true |
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218 | | Tclock ty' |
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219 | | Tstatic (_, ty') -> is_dimension_type ty' |
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220 | | _ -> false |
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221 | |||

222 | b616fe7a | xthirioux | let dynamic_type ty = |

223 | 22fe1c93 | ploc | let ty = repr ty in |

224 | match ty.tdesc with |
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225 | | Tstatic (_, ty') -> ty' |
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226 | | _ -> ty |
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227 | |||

228 | b616fe7a | xthirioux | let is_tuple_type ty = |

229 | match (repr ty).tdesc with |
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230 | | Ttuple _ -> true |
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231 | | _ -> false |
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232 | |||

233 | 22fe1c93 | ploc | let map_tuple_type f ty = |

234 | let ty = dynamic_type ty in |
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235 | match ty.tdesc with |
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236 | | (Ttuple ty_list) -> { ty with tdesc = Ttuple (List.map f ty_list) } |
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237 | | _ -> f ty |
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238 | b174e673 | xthirioux | |

239 | 8a183477 | xthirioux | let rec is_struct_type ty = |

240 | b174e673 | xthirioux | match (repr ty).tdesc with |

241 | | Tstruct _ -> true |
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242 | 8a183477 | xthirioux | | Tstatic (_, ty') -> is_struct_type ty' |

243 | b174e673 | xthirioux | | _ -> false |

244 | |||

245 | 22fe1c93 | ploc | let rec is_array_type ty = |

246 | match (repr ty).tdesc with |
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247 | | Tarray _ -> true |
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248 | b174e673 | xthirioux | | Tstatic (_, ty') -> is_array_type ty' (* looks strange !? *) |

249 | 22fe1c93 | ploc | | _ -> false |

250 | |||

251 | let array_type_dimension ty = |
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252 | match (dynamic_type ty).tdesc with |
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253 | | Tarray (d, _) -> d |
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254 | | _ -> assert false |
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255 | |||

256 | let rec array_type_multi_dimension ty = |
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257 | match (dynamic_type ty).tdesc with |
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258 | | Tarray (d, ty') -> d :: array_type_multi_dimension ty' |
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259 | | _ -> [] |
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260 | |||

261 | let array_element_type ty = |
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262 | match (dynamic_type ty).tdesc with |
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263 | | Tarray (_, ty') -> ty' |
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264 | | _ -> assert false |
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265 | |||

266 | let rec array_base_type ty = |
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267 | let ty = repr ty in |
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268 | match ty.tdesc with |
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269 | | Tarray (_, ty') |
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270 | | Tstatic (_, ty') -> array_base_type ty' |
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271 | | _ -> ty |
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272 | |||

273 | b174e673 | xthirioux | let is_address_type ty = |

274 | is_array_type ty || is_struct_type ty |
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275 | |||

276 | 22fe1c93 | ploc | let rec is_generic_type ty = |

277 | match (dynamic_type ty).tdesc with |
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278 | | Tarray (d, ty') -> |
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279 | (not (Dimension.is_dimension_const d)) || (is_generic_type ty') |
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280 | | _ -> false |
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281 | |||

282 | (** Splits [ty] into the [lhs,rhs] of an arrow type. Expects an arrow type |
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283 | (ensured by language syntax) *) |
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284 | let rec split_arrow ty = |
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285 | match (repr ty).tdesc with |
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286 | | Tarrow (tin,tout) -> tin,tout |
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287 | | Tstatic (_, ty') -> split_arrow ty' |
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288 | (* Functions are not first order, I don't think the var case |
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289 | needs to be considered here *) |
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290 | 870420a0 | ploc | | _ -> Format.eprintf "type %a is not a map@.Unable to split@.@?" print_ty ty; assert false |

291 | 22fe1c93 | ploc | |

292 | (** Returns the type corresponding to a type list. *) |
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293 | let type_of_type_list tyl = |
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294 | if (List.length tyl) > 1 then |
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295 | new_ty (Ttuple tyl) |
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296 | else |
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297 | List.hd tyl |
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298 | |||

299 | let type_list_of_type ty = |
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300 | match (repr ty).tdesc with |
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301 | | Ttuple tl -> tl |
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302 | | _ -> [ty] |
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303 | |||

304 | (** [is_polymorphic ty] returns true if [ty] is polymorphic. *) |
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305 | let rec is_polymorphic ty = |
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306 | match ty.tdesc with |
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307 | | Tenum _ | Tvar | Tint | Treal | Tbool | Trat | Tconst _ -> false |
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308 | | Tclock ty -> is_polymorphic ty |
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309 | | Tarrow (ty1,ty2) -> (is_polymorphic ty1) || (is_polymorphic ty2) |
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310 | | Ttuple tl -> List.exists (fun t -> is_polymorphic t) tl |
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311 | 12af4908 | xthirioux | | Tstruct fl -> List.exists (fun (_, t) -> is_polymorphic t) fl |

312 | 22fe1c93 | ploc | | Tlink t' -> is_polymorphic t' |

313 | | Tarray (d, ty) |
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314 | | Tstatic (d, ty) -> Dimension.is_polymorphic d || is_polymorphic ty |
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315 | | Tunivar -> true |
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316 | |||

317 | |||

318 | let mktyptuple nb typ = |
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319 | let array = Array.make nb typ in |
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320 | Ttuple (Array.to_list array) |
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321 | |||

322 | |||

323 | (* Local Variables: *) |
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324 | (* compile-command:"make -C .." *) |
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325 | (* End: *) |