gcc/ada/5osystem.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAT RUN-TIME COMPONENTS                          --
   4 --                                                                          --
   5 --                               S Y S T E M                                --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                             (OS/2 Version)                               --
   9 --                                                                          --
  10 --                            $Revision: 1.9 $
  11 --                                                                          --
  12 --          Copyright (C) 1992-2001 Free Software Foundation, Inc.          --
  13 --                                                                          --
  14 -- This specification is derived from the Ada Reference Manual for use with --
  15 -- GNAT. The copyright notice above, and the license provisions that follow --
  16 -- apply solely to the  contents of the part following the private keyword. --
  17 --                                                                          --
  18 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  19 -- terms of the  GNU General Public License as published  by the Free Soft- --
  20 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  21 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  22 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  23 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  24 -- for  more details.  You should have  received  a copy of the GNU General --
  25 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  26 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  27 -- MA 02111-1307, USA.                                                      --
  28 --                                                                          --
  29 -- As a special exception,  if other files  instantiate  generics from this --
  30 -- unit, or you link  this unit with other files  to produce an executable, --
  31 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  32 -- covered  by the  GNU  General  Public  License.  This exception does not --
  33 -- however invalidate  any other reasons why  the executable file  might be --
  34 -- covered by the  GNU Public License.                                      --
  35 --                                                                          --
  36 -- GNAT was originally developed  by the GNAT team at  New York University. --
  37 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  38 --                                                                          --
  39 ------------------------------------------------------------------------------
  40
  41 package System is
  42 pragma Pure (System);
  43 --  Note that we take advantage of the implementation permission to
  44 --  make this unit Pure instead of Preelaborable, see RM 13.7(36)
  45
  46    type Name is (SYSTEM_NAME_GNAT);
  47    System_Name : constant Name := SYSTEM_NAME_GNAT;
  48
  49    --  System-Dependent Named Numbers
  50
  51    Min_Int               : constant := Long_Long_Integer'First;
  52    Max_Int               : constant := Long_Long_Integer'Last;
  53
  54    Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;
  55    Max_Nonbinary_Modulus : constant := Integer'Last;
  56
  57    Max_Base_Digits       : constant := Long_Long_Float'Digits;
  58    Max_Digits            : constant := Long_Long_Float'Digits;
  59
  60    Max_Mantissa          : constant := 63;
  61    Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
  62
  63    Tick                  : constant := Standard'Tick;
  64
  65    --  Storage-related Declarations
  66
  67    type Address is private;
  68    Null_Address : constant Address;
  69
  70    Storage_Unit : constant := Standard'Storage_Unit;
  71    Word_Size    : constant := Standard'Word_Size;
  72    Memory_Size  : constant := 2 ** Standard'Address_Size;
  73
  74    --  Address comparison
  75
  76    function "<"  (Left, Right : Address) return Boolean;
  77    function "<=" (Left, Right : Address) return Boolean;
  78    function ">"  (Left, Right : Address) return Boolean;
  79    function ">=" (Left, Right : Address) return Boolean;
  80    function "="  (Left, Right : Address) return Boolean;
  81
  82    pragma Import (Intrinsic, "<");
  83    pragma Import (Intrinsic, "<=");
  84    pragma Import (Intrinsic, ">");
  85    pragma Import (Intrinsic, ">=");
  86    pragma Import (Intrinsic, "=");
  87
  88    --  Other System-Dependent Declarations
  89
  90    type Bit_Order is (High_Order_First, Low_Order_First);
  91    Default_Bit_Order : constant Bit_Order :=
  92                          Bit_Order'Val (Standard'Default_Bit_Order);
  93
  94    --  Priority-related Declarations (RM D.1)
  95
  96    Max_Priority : constant Positive := 30;
  97
  98    Max_Interrupt_Priority : constant Positive := 31;
  99
 100    subtype Any_Priority is Integer
 101      range 0 .. Standard'Max_Interrupt_Priority;
 102
 103    subtype Priority is Any_Priority
 104      range 0 .. Standard'Max_Priority;
 105
 106    --  Functional notation is needed in the following to avoid visibility
 107    --  problems when this package is compiled through rtsfind in the middle
 108    --  of another compilation.
 109
 110    subtype Interrupt_Priority is Any_Priority
 111      range
 112        Standard."+" (Standard'Max_Priority,  1) ..
 113          Standard'Max_Interrupt_Priority;
 114
 115    Default_Priority : constant Priority :=
 116      Standard."/" (Standard."+" (Priority'First, Priority'Last), 2);
 117
 118 private
 119
 120    type Address is mod Memory_Size;
 121    Null_Address : constant Address := 0;
 122
 123    --------------------------------------
 124    -- System Implementation Parameters --
 125    --------------------------------------
 126
 127    --  These parameters provide information about the target that is used
 128    --  by the compiler. They are in the private part of System, where they
 129    --  can be accessed using the special circuitry in the Targparm unit
 130    --  whose source should be consulted for more detailed descriptions
 131    --  of the individual switch values.
 132
 133    AAMP                      : constant Boolean := False;
 134    Command_Line_Args         : constant Boolean := True;
 135    Denorm                    : constant Boolean := True;
 136    Frontend_Layout           : constant Boolean := False;
 137    Functions_Return_By_DSP   : constant Boolean := False;
 138    Long_Shifts_Inlined       : constant Boolean := True;
 139    High_Integrity_Mode       : constant Boolean := False;
 140    Machine_Overflows         : constant Boolean := False;
 141    Machine_Rounds            : constant Boolean := True;
 142    OpenVMS                   : constant Boolean := False;
 143    Signed_Zeros              : constant Boolean := True;
 144    Stack_Check_Default       : constant Boolean := False;
 145    Stack_Check_Probes        : constant Boolean := False;
 146    Use_Ada_Main_Program_Name : constant Boolean := False;
 147    ZCX_By_Default            : constant Boolean := False;
 148    GCC_ZCX_Support           : constant Boolean := False;
 149    Front_End_ZCX_Support     : constant Boolean := False;
 150
 151 end System;