gcc/ada/get_targ.ads

------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                             G E T _ T A R G                              --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--          Copyright (C) 1992-2011, Free Software Foundation, Inc.         --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license.          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

--  This package provides an Import to the C functions which provide
--  values related to types on the target system. It is only needed for
--  exp_dbug and the elaboration of ttypes.

--  NOTE:  Any changes in this package must be reflected in jgettarg.ads
--  and aa_getta.ads!

--  Note that all these values return sizes of C types with corresponding
--  names. This allows GNAT to define the corresponding Ada types to have
--  the same representation. There is one exception to this: the
--  Wide_Character_Type uses twice the size of a C char, instead of the
--  size of wchar_t.

with Types; use Types;

package Get_Targ is
   pragma Preelaborate;

   function Get_Bits_Per_Unit return Pos;
   pragma Import (C, Get_Bits_Per_Unit, "get_target_bits_per_unit");

   function Get_Bits_Per_Word return Pos;
   pragma Import (C, Get_Bits_Per_Word, "get_target_bits_per_word");

   function Get_Char_Size return Pos; -- Standard.Character'Size
   pragma Import (C, Get_Char_Size, "get_target_char_size");

   function Get_Wchar_T_Size return Pos; -- Interfaces.C.wchar_t'Size
   pragma Import (C, Get_Wchar_T_Size, "get_target_wchar_t_size");

   function Get_Short_Size return Pos; -- Standard.Short_Integer'Size
   pragma Import (C, Get_Short_Size, "get_target_short_size");

   function Get_Int_Size return Pos; -- Standard.Integer'Size
   pragma Import (C, Get_Int_Size, "get_target_int_size");

   function Get_Long_Size return Pos; -- Standard.Long_Integer'Size
   pragma Import (C, Get_Long_Size, "get_target_long_size");

   function Get_Long_Long_Size return Pos; -- Standard.Long_Long_Integer'Size
   pragma Import (C, Get_Long_Long_Size, "get_target_long_long_size");

   function Get_Float_Size return Pos; -- Standard.Float'Size
   pragma Import (C, Get_Float_Size, "get_target_float_size");

   function Get_Double_Size return Pos; -- Standard.Long_Float'Size
   pragma Import (C, Get_Double_Size, "get_target_double_size");

   function Get_Long_Double_Size return Pos; -- Standard.Long_Long_Float'Size
   pragma Import (C, Get_Long_Double_Size, "get_target_long_double_size");

   function Get_Pointer_Size return Pos; -- System.Address'Size
   pragma Import (C, Get_Pointer_Size, "get_target_pointer_size");

   function Get_Maximum_Alignment return Pos;
   pragma Import (C, Get_Maximum_Alignment, "get_target_maximum_alignment");

   function Get_Float_Words_BE return Nat;
   pragma Import (C, Get_Float_Words_BE, "get_float_words_be");

   function Get_Words_BE return Nat;
   pragma Import (C, Get_Words_BE, "get_words_be");

   function Get_Bytes_BE return Nat;
   pragma Import (C, Get_Bytes_BE, "get_bytes_be");

   function Get_Bits_BE return Nat;
   pragma Import (C, Get_Bits_BE, "get_bits_be");

   function Get_Strict_Alignment return Nat;
   pragma Import (C, Get_Strict_Alignment, "get_target_strict_alignment");

   function Get_System_Allocator_Alignment return Nat;
   pragma Import (C, Get_System_Allocator_Alignment,
                  "get_target_system_allocator_alignment");

   function Get_Double_Float_Alignment return Nat;
   pragma Import (C, Get_Double_Float_Alignment,
                  "get_target_double_float_alignment");

   function Get_Double_Scalar_Alignment return Nat;
   pragma Import (C, Get_Double_Scalar_Alignment,
                  "get_target_double_scalar_alignment");

   function Get_Max_Unaligned_Field return Pos;
   --  Returns the maximum supported size in bits for a field that is
   --  not aligned on a storage unit boundary.

   function Width_From_Size  (Size : Pos) return Pos;
   function Digits_From_Size (Size : Pos) return Pos;
   --  Calculate values for 'Width or 'Digits from 'Size

end Get_Targ;