File : system.ads


------------------------------------------------------------------------------
--                                                                          --
--                        GNAT RUN-TIME COMPONENTS                          --
--                                                                          --
--                               S Y S T E M                                --
--                                                                          --
--                                 S p e c                                  --
--                          (GNU-Linux/x86 Version)                         --
--                                                                          --
--                            $Revision: 1.8 $
--                                                                          --
--          Copyright (C) 1992-2002 Free Software Foundation, Inc.          --
--                                                                          --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT. The copyright notice above, and the license provisions that follow --
-- apply solely to the  contents of the part following the private keyword. --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- ware  Foundation;  either version 2,  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 --
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-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
-- MA 02111-1307, USA.                                                      --
--                                                                          --
-- As a special exception,  if other files  instantiate  generics from this --
-- unit, or you link  this unit with other files  to produce an executable, --
-- this  unit  does not  by itself cause  the resulting  executable  to  be --
-- covered  by the  GNU  General  Public  License.  This exception does not --
-- however invalidate  any other reasons why  the executable file  might be --
-- covered by the  GNU Public License.                                      --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
--                                                                          --
------------------------------------------------------------------------------

package System is
pragma Pure (System);
--  Note that we take advantage of the implementation permission to
--  make this unit Pure instead of Preelaborable, see RM 13.7(36)

   type Name is (SYSTEM_NAME_GNAT); 
   System_Name : constant Name := SYSTEM_NAME_GNAT; 

   --  System-Dependent Named Numbers

   Min_Int               : constant := Long_Long_Integer'First; 
   Max_Int               : constant := Long_Long_Integer'Last; 

   Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size; 
   Max_Nonbinary_Modulus : constant := Integer'Last; 

   Max_Base_Digits       : constant := Long_Long_Float'Digits; 
   Max_Digits            : constant := Long_Long_Float'Digits; 

   Max_Mantissa          : constant := 63; 
   Fine_Delta            : constant := 2.0 ** (-Max_Mantissa); 

   Tick                  : constant := 1.0; 

   --  Storage-related Declarations

   type Address is private; 
   Null_Address : constant Address; 

   Storage_Unit : constant := 8; 
   Word_Size    : constant := 32; 
   Memory_Size  : constant := 2 ** 32; 

   --  Address comparison

   function "<"  (Left, Right : Address) return Boolean; 
   function "<=" (Left, Right : Address) return Boolean; 
   function ">"  (Left, Right : Address) return Boolean; 
   function ">=" (Left, Right : Address) return Boolean; 
   function "="  (Left, Right : Address) return Boolean; 

   pragma Import (Intrinsic, "<");
   pragma Import (Intrinsic, "<=");
   pragma Import (Intrinsic, ">");
   pragma Import (Intrinsic, ">=");
   pragma Import (Intrinsic, "=");

   --  Other System-Dependent Declarations

   type Bit_Order is (High_Order_First, Low_Order_First); 
   Default_Bit_Order : constant Bit_Order := Low_Order_First; 

   --  Priority-related Declarations (RM D.1)

   Max_Priority           : constant Positive := 30; 
   Max_Interrupt_Priority : constant Positive := 31; 

   subtype Any_Priority       is Integer      range  0 .. 31; 
   subtype Priority           is Any_Priority range  0 .. 30; 
   subtype Interrupt_Priority is Any_Priority range 31 .. 31; 

   Default_Priority : constant Priority := 15; 

private

   type Address is mod Memory_Size; 
   Null_Address : constant Address := 0; 

   --------------------------------------
   -- System Implementation Parameters --
   --------------------------------------

   --  These parameters provide information about the target that is used
   --  by the compiler. They are in the private part of System, where they
   --  can be accessed using the special circuitry in the Targparm unit
   --  whose source should be consulted for more detailed descriptions
   --  of the individual switch values.

   AAMP                      : constant Boolean := False; 
   Backend_Divide_Checks     : constant Boolean := False; 
   Backend_Overflow_Checks   : constant Boolean := False; 
   Command_Line_Args         : constant Boolean := True; 
   Denorm                    : constant Boolean := True; 
   Fractional_Fixed_Ops      : constant Boolean := False; 
   Frontend_Layout           : constant Boolean := False; 
   Functions_Return_By_DSP   : constant Boolean := False; 
   Long_Shifts_Inlined       : constant Boolean := True; 
   High_Integrity_Mode       : constant Boolean := False; 
   Machine_Overflows         : constant Boolean := False; 
   Machine_Rounds            : constant Boolean := True; 
   OpenVMS                   : constant Boolean := False; 
   Signed_Zeros              : constant Boolean := True; 
   Stack_Check_Default       : constant Boolean := False; 
   Stack_Check_Probes        : constant Boolean := False; 
   Use_Ada_Main_Program_Name : constant Boolean := False; 
   ZCX_By_Default            : constant Boolean := False; 
   GCC_ZCX_Support           : constant Boolean := False; 
   Front_End_ZCX_Support     : constant Boolean := True; 
end System;