gcc/ada/uintp.h

   1 /****************************************************************************
   2  *                                                                          *
   3  *                         GNAT COMPILER COMPONENTS                         *
   4  *                                                                          *
   5  *                                U I N T P                                 *
   6  *                                                                          *
   7  *                              C Header File                               *
   8  *                                                                          *
   9  *            Copyright (C) 1992-2010, Free Software Foundation, Inc.       *
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  11  * GNAT is free software;  you can  redistribute it  and/or modify it under *
  12  * terms of the  GNU General Public License as published  by the Free Soft- *
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  14  * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
  15  * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
  16  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License *
  17  * for  more details.  You should have  received  a copy of the GNU General *
  18  * Public License  distributed with GNAT; see file COPYING3.  If not, go to *
  19  * http://www.gnu.org/licenses for a complete copy of the license.          *
  20  *                                                                          *
  21  * GNAT was originally developed  by the GNAT team at  New York University. *
  22  * Extensive contributions were provided by Ada Core Technologies Inc.      *
  23  *                                                                          *
  24  ****************************************************************************/
  25
  26 /* This file corresponds to the Ada package specification Uintp. It was
  27    created manually from the files uintp.ads and uintp.adb  */
  28
  29 /* Support for universal integer arithmetic */
  30
  31 struct Uint_Entry
  32 {
  33   Pos Length;
  34   Int Loc;
  35 };
  36
  37 /* See if a Uint is within the range of an integer.  */
  38 #define UI_Is_In_Int_Range  uintp__ui_is_in_int_range
  39 extern Boolean UI_Is_In_Int_Range       (Uint);
  40
  41 /* Obtain Char_Code value from Uint input.  Value must be in range.  */
  42 #define UI_To_CC uintp__ui_to_cc
  43 extern Char_Code UI_To_CC               (Uint);
  44
  45 /* Convert a Char_Code into a Uint.  */
  46 #define UI_From_CC uintp__ui_from_cc
  47 extern Uint UI_From_CC                  (Char_Code);
  48
  49 /* Obtain Int value from Uint input.  Abort if the result is out of range.  */
  50 #define UI_To_Int uintp__ui_to_int
  51 extern Int UI_To_Int                    (Uint);
  52
  53 /* Similarly, but return a GCC INTEGER_CST.  */
  54 extern tree UI_To_gnu                   (Uint, tree);
  55
  56 /* Convert an Int into a Uint.  */
  57 #define UI_From_Int uintp__ui_from_int
  58 extern Uint UI_From_Int                 (int);
  59
  60 /* Similarly, but take a GCC INTEGER_CST.  */
  61 extern Uint UI_From_gnu                 (tree);
  62
  63 /* Uint values are represented as multiple precision integers stored in a
  64    multi-digit format using UI_Base as the base.  This value is chosen so
  65    that the product UI_Base*UI_Base is within the range of Int values.  */
  66 #define UI_Base uintp__base
  67 extern const int UI_Base;
  68
  69 /* Types for the fat pointer of Int vectors and the template it points to.  */
  70 typedef struct {int Low_Bound, High_Bound; } Vector_Template;
  71 typedef struct {const int *Array; Vector_Template *Bounds; }
  72         __attribute ((aligned (sizeof (char *) * 2))) Int_Vector;
  73
  74 /* Create and return the Uint value from the Int vector.  */
  75 #define Vector_To_Uint uintp__vector_to_uint
  76 extern Uint Vector_To_Uint              (Int_Vector, Boolean);
  77
  78 /* Universal integers are represented by the Uint type which is an index into
  79    the Uints_Ptr table containing Uint_Entry values.  A Uint_Entry contains an
  80    index and length for getting the "digits" of the universal integer from the
  81    Udigits_Ptr table.
  82
  83    For efficiency, this method is used only for integer values larger than the
  84    constant Uint_Bias.  If a Uint is less than this constant, then it contains
  85    the integer value itself.  The origin of the Uints_Ptr table is adjusted so
  86    that a Uint value of Uint_Bias indexes the first element.  */
  87
  88 #define Uints_Ptr (uintp__uints__table - Uint_Table_Start)
  89 extern struct Uint_Entry *uintp__uints__table;
  90
  91 #define Udigits_Ptr uintp__udigits__table
  92 extern int *uintp__udigits__table;