parsing_cocci/type_cocci.ml

   1 (*
   2  * Copyright 2010, INRIA, University of Copenhagen
   3  * Julia Lawall, Rene Rydhof Hansen, Gilles Muller, Nicolas Palix
   4  * Copyright 2005-2009, Ecole des Mines de Nantes, University of Copenhagen
   5  * Yoann Padioleau, Julia Lawall, Rene Rydhof Hansen, Henrik Stuart, Gilles Muller, Nicolas Palix
   6  * This file is part of Coccinelle.
   7  *
   8  * Coccinelle is free software: you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation, according to version 2 of the License.
  11  *
  12  * Coccinelle is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with Coccinelle.  If not, see <http://www.gnu.org/licenses/>.
  19  *
  20  * The authors reserve the right to distribute this or future versions of
  21  * Coccinelle under other licenses.
  22  *)
  23
  24
  25 (* for metavariables in general, but here because needed for metatypes *)
  26 type inherited = bool (* true if inherited *)
  27 type keep_binding = Unitary (* need no info *)
  28   | Nonunitary (* need an env entry *) | Saved (* need a witness *)
  29
  30 type meta_name = string * string (*Ast_cocci.meta_name*)
  31
  32 type typeC =
  33     ConstVol        of const_vol * typeC
  34   | BaseType        of baseType
  35   | SignedT         of sign * typeC option
  36   | Pointer         of typeC
  37   | FunctionPointer of typeC (* only return type *)
  38   | Array           of typeC (* drop size info *)
  39   | EnumName        of name
  40   | StructUnionName of structUnion * name
  41   | TypeName        of string
  42   | MetaType        of meta_name * keep_binding * inherited
  43   | Unknown (* for metavariables of type expression *^* *)
  44
  45 and name =
  46     NoName
  47   | Name of string
  48   | MV of meta_name * keep_binding * inherited
  49
  50 and tagged_string = string
  51
  52 and baseType = VoidType | CharType | ShortType | IntType | DoubleType
  53 | FloatType | LongType | LongLongType | BoolType
  54 | SizeType | SSizeType | PtrDiffType
  55
  56 and structUnion = Struct | Union
  57
  58 and sign = Signed | Unsigned
  59
  60 and const_vol = Const | Volatile
  61
  62 (* --------------------------------------------------------------------- *)
  63 (* Printer *)
  64 open Format
  65
  66 let rec type2c = function
  67     ConstVol(cv,ty) -> (const_vol cv) ^ (type2c ty)
  68   | BaseType(ty) -> baseType ty
  69   | SignedT(sgn,None) -> sign sgn
  70   | SignedT(sgn,Some ty) -> (sign sgn) ^ (type2c ty)
  71   | Pointer(ty) -> (type2c ty) ^ "*"
  72   | FunctionPointer(ty) -> (type2c ty) ^ "(*)(...)"
  73   | Array(ty) -> (type2c ty) ^ "[] "
  74   | EnumName(name) -> "enum " ^ (print_name name)
  75   | StructUnionName(kind,name) -> (structUnion kind) ^ (print_name name)
  76   | TypeName(name) -> name ^ " "
  77   | MetaType((rule,name),keep,inherited) -> name ^ " "
  78       (*
  79       let print_unitary = function
  80           Unitary -> print_string "unitary"
  81         | Nonunitary -> print_string "nonunitary"
  82         | Saved -> print_string "saved" in
  83       print_string "/* ";
  84       print_string "keep:"; print_unitary keep;
  85       print_string " inherited:"; print_bool inherited;
  86       print_string " */"
  87       *)
  88   | Unknown -> "unknown "
  89
  90 and print_name = function
  91     NoName -> ""
  92   | MV ((_,name),_,_) -> name ^ " "
  93   | Name name -> name ^ " "
  94
  95 and baseType = function
  96     VoidType -> "void "
  97   | CharType -> "char "
  98   | ShortType -> "short "
  99   | IntType -> "int "
 100   | DoubleType -> "double "
 101   | FloatType -> "float "
 102   | LongType -> "long "
 103   | LongLongType -> "long long "
 104   | BoolType -> "bool "
 105   | SizeType -> "size_t "
 106   | SSizeType -> "ssize_t "
 107   | PtrDiffType -> "ptrdiff_t "
 108
 109
 110 and structUnion = function
 111     Struct -> "struct "
 112   | Union -> "union "
 113
 114 and sign = function
 115     Signed -> "signed "
 116   | Unsigned -> "unsigned "
 117
 118 and const_vol = function
 119     Const -> "const "
 120   | Volatile -> "volatile "
 121
 122 let typeC t = print_string (type2c t)
 123
 124 (* t1 should be less informative than t1, eg t1 = Pointer(Unknown) and t2 =
 125 Pointer(int) *)
 126 (* only used in iso *)
 127 (* needs to do something for MetaType *)
 128 let compatible t1 = function
 129     None -> t1 = Unknown
 130   | Some t2 ->
 131       let rec loop = function
 132           (Unknown,_) -> true
 133         | (ConstVol(cv1,ty1),ConstVol(cv2,ty2)) when cv1 = cv2 ->
 134             loop(ty1,ty2)
 135         | (Pointer(ty1),Pointer(ty2)) -> loop(ty1,ty2)
 136         | (FunctionPointer(ty1),_) -> false (* not enough info *)
 137         | (_,FunctionPointer(ty2)) -> false (* not enough info *)
 138         | (Array(ty1),Array(ty2)) -> loop(ty1,ty2)
 139         | (_,_) -> t1=t2 in
 140       loop (t1,t2)