gcc/ada/uintp.h

   1 /****************************************************************************
   2  *                                                                          *
   3  *                         GNAT COMPILER COMPONENTS                         *
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   5  *                                U I N T P                                 *
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  22  * GNAT was originally developed  by the GNAT team at  New York University. *
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  25  ****************************************************************************/
  26
  27 /* This file corresponds to the Ada package specification Uintp. It was
  28    created manually from the files uintp.ads and uintp.adb  */
  29
  30 /* Support for universal integer arithmetic */
  31
  32 struct Uint_Entry
  33 {
  34   Pos Length;
  35   Int Loc;
  36 };
  37
  38 /* See if a Uint is within the range of an integer.  */
  39 #define UI_Is_In_Int_Range  uintp__ui_is_in_int_range
  40 extern Boolean UI_Is_In_Int_Range       (Uint);
  41
  42 /* Obtain Int value from Uint input. This will abort if the result is
  43    out of range.  */
  44 #define UI_To_Int uintp__ui_to_int
  45 extern Int UI_To_Int                    (Uint);
  46
  47 /* Convert an Int into a Uint.  */
  48 #define UI_From_Int uintp__ui_from_int
  49 extern Uint UI_From_Int                 (int);
  50
  51 /* Similarly, but return a GCC INTEGER_CST.  Overflow is tested by the
  52    constant-folding used to build the node.  TYPE is the GCC type of the
  53    resulting node.  */
  54 extern tree UI_To_gnu                   (Uint, tree);
  55
  56 /* Universal integers are represented by the Uint type which is an index into
  57    the Uints_Ptr table containing Uint_Entry values.  A Uint_Entry contains an
  58    index and length for getting the "digits" of the universal integer from the
  59    Udigits_Ptr table.
  60
  61    For efficiency, this method is used only for integer values larger than the
  62    constant Uint_Bias.  If a Uint is less than this constant, then it contains
  63    the integer value itself.  The origin of the Uints_Ptr table is adjusted so
  64    that a Uint value of Uint_Bias indexes the first element.  */
  65
  66 #define Uints_Ptr (uintp__uints__table - Uint_Table_Start)
  67 extern struct Uint_Entry *uintp__uints__table;
  68
  69 #define Udigits_Ptr uintp__udigits__table
  70 extern int *uintp__udigits__table;
  71
  72 #define Uint_0 (Uint_Direct_Bias + 0)
  73 #define Uint_1 (Uint_Direct_Bias + 1)