## lustrec / src / types.ml @ e42fb618

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1 | b38ffff3 | 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 | 0cbf0839 | 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 | 6b4d172f | xthirioux | | Tclock of type_expr (* A type expression explicitely tagged as carrying a clock *) |

30 | 0cbf0839 | 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 | aa223e69 | xthirioux | | Tstruct of (ident * type_expr) list |

34 | 0cbf0839 | 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 | 0b78e972 | xthirioux | | Declared_but_undefined of ident |

46 | 0cbf0839 | ploc | | Unbound_type of ident |

47 | | Not_a_dimension |
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48 | | Not_a_constant |
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49 | 6b4d172f | xthirioux | | Assigned_constant of ident |

50 | 0cbf0839 | ploc | | WrongArity of int * int |

51 | 14d694c7 | xthirioux | | WrongMorphism of int * int |

52 | 6aeb3388 | xthirioux | | Type_mismatch of ident |

53 | 0cbf0839 | ploc | | Type_clash of type_expr * type_expr |

54 | | Poly_imported_node of ident |
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55 | |||

56 | exception Unify of type_expr * type_expr |
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57 | exception Error of Location.t * error |
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58 | |||

59 | (* Pretty-print*) |
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60 | open Format |
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61 | aa223e69 | xthirioux | |

62 | let rec print_struct_ty_field fmt (label, ty) = |
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63 | fprintf fmt "%a : %a" pp_print_string label print_ty ty |
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64 | and print_ty fmt ty = |
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65 | 0cbf0839 | ploc | match ty.tdesc with |

66 | | Tvar -> |
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67 | fprintf fmt "_%s" (name_of_type ty.tid) |
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68 | | Tint -> |
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69 | fprintf fmt "int" |
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70 | | Treal -> |
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71 | fprintf fmt "real" |
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72 | | Tbool -> |
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73 | fprintf fmt "bool" |
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74 | | Tclock t -> |
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75 | fprintf fmt "%a clock" print_ty t |
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76 | | Tstatic (d, t) -> |
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77 | fprintf fmt "(%a:%a)" Dimension.pp_dimension d print_ty t |
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78 | | Tconst t -> |
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79 | fprintf fmt "%s" t |
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80 | | Trat -> |
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81 | fprintf fmt "rat" |
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82 | | Tarrow (ty1,ty2) -> |
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83 | f6fa97f9 | xthirioux | fprintf fmt "%a -> %a" print_ty ty1 print_ty ty2 |

84 | 0cbf0839 | ploc | | Ttuple tylist -> |

85 | fprintf fmt "(%a)" |
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86 | (Utils.fprintf_list ~sep:"*" print_ty) tylist |
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87 | | Tenum taglist -> |
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88 | aa223e69 | xthirioux | fprintf fmt "enum {%a }" |

89 | (Utils.fprintf_list ~sep:", " pp_print_string) taglist |
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90 | | Tstruct fieldlist -> |
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91 | fprintf fmt "struct {%a }" |
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92 | (Utils.fprintf_list ~sep:"; " print_struct_ty_field) fieldlist |
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93 | 0cbf0839 | ploc | | Tarray (e, ty) -> |

94 | fprintf fmt "%a^%a" print_ty ty Dimension.pp_dimension e |
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95 | | Tlink ty -> |
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96 | print_ty fmt ty |
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97 | | Tunivar -> |
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98 | fprintf fmt "'%s" (name_of_type ty.tid) |
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99 | |||

100 | aa223e69 | xthirioux | let rec print_node_struct_ty_field fmt (label, ty) = |

101 | fprintf fmt "%a : %a" pp_print_string label print_node_ty ty |
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102 | and print_node_ty fmt ty = |
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103 | 8b3afe43 | xthirioux | match ty.tdesc with |

104 | 0b78e972 | xthirioux | | Tvar -> begin |

105 | 66e38617 | xthirioux | (*Format.eprintf "DEBUG:Types.print_node@.";*) |

106 | 0b78e972 | xthirioux | fprintf fmt "_%s" (name_of_type ty.tid) |

107 | end |
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108 | 8b3afe43 | xthirioux | | Tint -> |

109 | fprintf fmt "int" |
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110 | | Treal -> |
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111 | fprintf fmt "real" |
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112 | | Tbool -> |
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113 | fprintf fmt "bool" |
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114 | | Tclock t -> |
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115 | 6b4d172f | xthirioux | fprintf fmt "%a clock" print_node_ty t |

116 | 8b3afe43 | xthirioux | | Tstatic (_, t) -> |

117 | fprintf fmt "%a" print_node_ty t |
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118 | | Tconst t -> |
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119 | fprintf fmt "%s" t |
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120 | | Trat -> |
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121 | fprintf fmt "rat" |
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122 | | Tarrow (ty1,ty2) -> |
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123 | 6b4d172f | xthirioux | fprintf fmt "%a -> %a" print_node_ty ty1 print_node_ty ty2 |

124 | 8b3afe43 | xthirioux | | Ttuple tylist -> |

125 | fprintf fmt "(%a)" |
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126 | 6b4d172f | xthirioux | (Utils.fprintf_list ~sep:"*" print_node_ty) tylist |

127 | 8b3afe43 | xthirioux | | Tenum taglist -> |

128 | aa223e69 | xthirioux | fprintf fmt "enum {%a }" |

129 | (Utils.fprintf_list ~sep:", " pp_print_string) taglist |
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130 | | Tstruct fieldlist -> |
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131 | fprintf fmt "struct {%a }" |
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132 | (Utils.fprintf_list ~sep:"; " print_node_struct_ty_field) fieldlist |
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133 | 8b3afe43 | xthirioux | | Tarray (e, ty) -> |

134 | 6b4d172f | xthirioux | fprintf fmt "%a^%a" print_node_ty ty Dimension.pp_dimension e |

135 | 8b3afe43 | xthirioux | | Tlink ty -> |

136 | 6b4d172f | xthirioux | print_node_ty fmt ty |

137 | 8b3afe43 | xthirioux | | Tunivar -> |

138 | fprintf fmt "'%s" (name_of_type ty.tid) |
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139 | |||

140 | 0cbf0839 | ploc | let pp_error fmt = function |

141 | | Unbound_value id -> |
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142 | fprintf fmt "Unknown value %s@." id |
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143 | | Unbound_type id -> |
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144 | fprintf fmt "Unknown type %s@." id |
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145 | | Already_bound id -> |
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146 | fprintf fmt "%s is already declared@." id |
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147 | | Already_defined id -> |
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148 | fprintf fmt "Multiple definitions of variable %s@." id |
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149 | | Not_a_constant -> |
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150 | fprintf fmt "This expression is not a constant@." |
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151 | 6b4d172f | xthirioux | | Assigned_constant id -> |

152 | fprintf fmt "The constant %s cannot be assigned@." id |
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153 | 0cbf0839 | ploc | | Not_a_dimension -> |

154 | fprintf fmt "This expression is not a valid dimension@." |
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155 | | WrongArity (ar1, ar2) -> |
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156 | fprintf fmt "Expecting %d argument(s), found %d@." ar1 ar2 |
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157 | 14d694c7 | xthirioux | | WrongMorphism (ar1, ar2) -> |

158 | fprintf fmt "Expecting %d argument(s) for homomorphic extension, found %d@." ar1 ar2 |
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159 | 6aeb3388 | xthirioux | | Type_mismatch id -> |

160 | fprintf fmt "Definition and declaration of type %s don't agree@." id |
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161 | 0cbf0839 | ploc | | Undefined_var vmap -> |

162 | fprintf fmt "No definition provided for variable(s): %a@." |
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163 | (Utils.fprintf_list ~sep:"," pp_print_string) |
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164 | (fst (Utils.list_of_imap vmap)) |
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165 | 0b78e972 | xthirioux | | Declared_but_undefined id -> |

166 | 70e1006b | xthirioux | fprintf fmt "%s is declared but not defined@." id |

167 | 0cbf0839 | ploc | | Type_clash (ty1,ty2) -> |

168 | Utils.reset_names (); |
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169 | fprintf fmt "Expected type %a, got type %a@." print_ty ty1 print_ty ty2 |
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170 | | Poly_imported_node id -> |
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171 | fprintf fmt "Imported nodes cannot have a polymorphic type@." |
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172 | |||

173 | |||

174 | let new_id = ref (-1) |
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175 | |||

176 | let new_ty desc = |
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177 | incr new_id; {tdesc = desc; tid = !new_id } |
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178 | |||

179 | let new_var () = |
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180 | new_ty Tvar |
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181 | |||

182 | let new_univar () = |
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183 | new_ty Tunivar |
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184 | |||

185 | let rec repr = |
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186 | function |
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187 | {tdesc = Tlink t'} -> |
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188 | repr t' |
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189 | | t -> t |
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190 | |||

191 | let get_static_value ty = |
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192 | aa223e69 | xthirioux | match (repr ty).tdesc with |

193 | | Tstatic (d, _) -> Some d |
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194 | | _ -> None |
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195 | |||

196 | let get_field_type ty label = |
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197 | match (repr ty).tdesc with |
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198 | | Tstruct fl -> (try Some (List.assoc label fl) with Not_found -> None) |
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199 | | _ -> None |
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200 | 0cbf0839 | ploc | |

201 | 6b4d172f | xthirioux | let is_numeric_type ty = |

202 | match (repr ty).tdesc with |
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203 | | Tint |
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204 | | Treal -> true |
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205 | | _ -> false |
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206 | |||

207 | let is_bool_type ty = |
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208 | match (repr ty).tdesc with |
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209 | | Tbool -> true |
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210 | | _ -> false |
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211 | |||

212 | let get_clock_base_type ty = |
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213 | c518d082 | xthirioux | match (repr ty).tdesc with |

214 | 6b4d172f | xthirioux | | Tclock ty -> Some ty |

215 | | _ -> None |
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216 | c518d082 | xthirioux | |

217 | 0cbf0839 | ploc | let rec is_dimension_type ty = |

218 | match (repr ty).tdesc with |
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219 | | Tint |
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220 | | Tbool -> true |
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221 | | Tclock ty' |
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222 | | Tstatic (_, ty') -> is_dimension_type ty' |
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223 | | _ -> false |
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224 | |||

225 | 14d694c7 | xthirioux | let dynamic_type ty = |

226 | 0cbf0839 | ploc | let ty = repr ty in |

227 | match ty.tdesc with |
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228 | | Tstatic (_, ty') -> ty' |
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229 | | _ -> ty |
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230 | |||

231 | 14d694c7 | xthirioux | let is_tuple_type ty = |

232 | match (repr ty).tdesc with |
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233 | | Ttuple _ -> true |
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234 | | _ -> false |
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235 | |||

236 | 0cbf0839 | ploc | let map_tuple_type f ty = |

237 | let ty = dynamic_type ty in |
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238 | match ty.tdesc with |
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239 | | (Ttuple ty_list) -> { ty with tdesc = Ttuple (List.map f ty_list) } |
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240 | | _ -> f ty |
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241 | 51768260 | xthirioux | |

242 | d96d54ac | xthirioux | let rec is_struct_type ty = |

243 | 51768260 | xthirioux | match (repr ty).tdesc with |

244 | | Tstruct _ -> true |
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245 | d96d54ac | xthirioux | | Tstatic (_, ty') -> is_struct_type ty' |

246 | 51768260 | xthirioux | | _ -> false |

247 | |||

248 | 0cbf0839 | ploc | let rec is_array_type ty = |

249 | match (repr ty).tdesc with |
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250 | | Tarray _ -> true |
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251 | 51768260 | xthirioux | | Tstatic (_, ty') -> is_array_type ty' (* looks strange !? *) |

252 | 0cbf0839 | ploc | | _ -> false |

253 | |||

254 | let array_type_dimension ty = |
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255 | match (dynamic_type ty).tdesc with |
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256 | | Tarray (d, _) -> d |
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257 | | _ -> assert false |
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258 | |||

259 | let rec array_type_multi_dimension ty = |
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260 | match (dynamic_type ty).tdesc with |
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261 | | Tarray (d, ty') -> d :: array_type_multi_dimension ty' |
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262 | | _ -> [] |
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263 | |||

264 | let array_element_type ty = |
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265 | match (dynamic_type ty).tdesc with |
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266 | | Tarray (_, ty') -> ty' |
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267 | | _ -> assert false |
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268 | |||

269 | let rec array_base_type ty = |
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270 | let ty = repr ty in |
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271 | match ty.tdesc with |
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272 | | Tarray (_, ty') |
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273 | | Tstatic (_, ty') -> array_base_type ty' |
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274 | | _ -> ty |
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275 | |||

276 | 51768260 | xthirioux | let is_address_type ty = |

277 | is_array_type ty || is_struct_type ty |
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278 | |||

279 | 0cbf0839 | ploc | let rec is_generic_type ty = |

280 | match (dynamic_type ty).tdesc with |
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281 | | Tarray (d, ty') -> |
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282 | (not (Dimension.is_dimension_const d)) || (is_generic_type ty') |
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283 | | _ -> false |
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284 | |||

285 | (** Splits [ty] into the [lhs,rhs] of an arrow type. Expects an arrow type |
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286 | (ensured by language syntax) *) |
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287 | let rec split_arrow ty = |
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288 | match (repr ty).tdesc with |
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289 | | Tarrow (tin,tout) -> tin,tout |
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290 | | Tstatic (_, ty') -> split_arrow ty' |
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291 | (* Functions are not first order, I don't think the var case |
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292 | needs to be considered here *) |
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293 | 5b5625e1 | ploc | | _ -> Format.eprintf "type %a is not a map@.Unable to split@.@?" print_ty ty; assert false |

294 | 0cbf0839 | ploc | |

295 | (** Returns the type corresponding to a type list. *) |
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296 | let type_of_type_list tyl = |
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297 | if (List.length tyl) > 1 then |
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298 | new_ty (Ttuple tyl) |
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299 | else |
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300 | List.hd tyl |
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301 | |||

302 | let type_list_of_type ty = |
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303 | match (repr ty).tdesc with |
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304 | | Ttuple tl -> tl |
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305 | | _ -> [ty] |
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306 | |||

307 | (** [is_polymorphic ty] returns true if [ty] is polymorphic. *) |
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308 | let rec is_polymorphic ty = |
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309 | match ty.tdesc with |
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310 | | Tenum _ | Tvar | Tint | Treal | Tbool | Trat | Tconst _ -> false |
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311 | | Tclock ty -> is_polymorphic ty |
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312 | | Tarrow (ty1,ty2) -> (is_polymorphic ty1) || (is_polymorphic ty2) |
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313 | | Ttuple tl -> List.exists (fun t -> is_polymorphic t) tl |
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314 | aa223e69 | xthirioux | | Tstruct fl -> List.exists (fun (_, t) -> is_polymorphic t) fl |

315 | 0cbf0839 | ploc | | Tlink t' -> is_polymorphic t' |

316 | | Tarray (d, ty) |
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317 | | Tstatic (d, ty) -> Dimension.is_polymorphic d || is_polymorphic ty |
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318 | | Tunivar -> true |
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319 | |||

320 | |||

321 | let mktyptuple nb typ = |
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322 | let array = Array.make nb typ in |
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323 | Ttuple (Array.to_list array) |
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324 | |||

325 | |||

326 | (* Local Variables: *) |
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327 | (* compile-command:"make -C .." *) |
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328 | (* End: *) |