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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                        GNAT RUN-TIME COMPONENTS                          --
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--                                                                          --
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--                               S Y S T E M                                --
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--                                                                          --
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--                                 S p e c                                  --
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--                       (OpenVMS DEC Threads Version)                      --
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--                                                                          --
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--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- This specification is derived from the Ada Reference Manual for use with --
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-- GNAT. The copyright notice above, and the license provisions that follow --
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-- apply solely to the  contents of the part following the private keyword. --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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package System is
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   pragma Pure;
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   --  Note that we take advantage of the implementation permission to make
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   --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
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   --  2005, this is Pure in any case (AI-362).
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   type Name is (SYSTEM_NAME_GNAT);
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   System_Name : constant Name := SYSTEM_NAME_GNAT;
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   --  System-Dependent Named Numbers
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   Min_Int               : constant := Long_Long_Integer'First;
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   Max_Int               : constant := Long_Long_Integer'Last;
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   Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;
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   Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
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   Max_Base_Digits       : constant := Long_Long_Float'Digits;
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   Max_Digits            : constant := Long_Long_Float'Digits;
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   Max_Mantissa          : constant := 63;
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   Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
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   Tick                  : constant := 0.01;
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   --  Storage-related Declarations
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   type Address is private;
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   pragma Preelaborable_Initialization (Address);
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   Null_Address : constant Address;
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   Storage_Unit : constant := 8;
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   Word_Size    : constant := 32;
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   Memory_Size  : constant := 2 ** 32;
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   --  Address comparison
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   function "<"  (Left, Right : Address) return Boolean;
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   function "<=" (Left, Right : Address) return Boolean;
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   function ">"  (Left, Right : Address) return Boolean;
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   function ">=" (Left, Right : Address) return Boolean;
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   function "="  (Left, Right : Address) return Boolean;
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   pragma Import (Intrinsic, "<");
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   pragma Import (Intrinsic, "<=");
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   pragma Import (Intrinsic, ">");
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   pragma Import (Intrinsic, ">=");
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   pragma Import (Intrinsic, "=");
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   --  Other System-Dependent Declarations
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   type Bit_Order is (High_Order_First, Low_Order_First);
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   Default_Bit_Order : constant Bit_Order := Low_Order_First;
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   pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
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   --  Priority-related Declarations (RM D.1)
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   Max_Priority           : constant Positive := 30;
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   Max_Interrupt_Priority : constant Positive := 31;
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   subtype Any_Priority       is Integer      range  0 .. 31;
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   subtype Priority           is Any_Priority range  0 .. 30;
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   subtype Interrupt_Priority is Any_Priority range 31 .. 31;
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   Default_Priority : constant Priority := 15;
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private
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   type Address is mod Memory_Size;
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   Null_Address : constant Address := 0;
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   --------------------------------------
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   -- System Implementation Parameters --
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   --------------------------------------
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   --  These parameters provide information about the target that is used
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   --  by the compiler. They are in the private part of System, where they
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   --  can be accessed using the special circuitry in the Targparm unit
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   --  whose source should be consulted for more detailed descriptions
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   --  of the individual switch values.
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   Backend_Divide_Checks     : constant Boolean := False;
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   Backend_Overflow_Checks   : constant Boolean := True;
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   Command_Line_Args         : constant Boolean := True;
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   Configurable_Run_Time     : constant Boolean := False;
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   Denorm                    : constant Boolean := False;
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   Duration_32_Bits          : constant Boolean := False;
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   Exit_Status_Supported     : constant Boolean := True;
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   Fractional_Fixed_Ops      : constant Boolean := False;
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   Frontend_Layout           : constant Boolean := False;
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   Machine_Overflows         : constant Boolean := False;
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   Machine_Rounds            : constant Boolean := True;
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   OpenVMS                   : constant Boolean := True;
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   Preallocated_Stacks       : constant Boolean := False;
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   Signed_Zeros              : constant Boolean := True;
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   Stack_Check_Default       : constant Boolean := True;
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   Stack_Check_Probes        : constant Boolean := True;
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   Stack_Check_Limits        : constant Boolean := False;
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   Support_64_Bit_Divides    : constant Boolean := True;
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   Support_Aggregates        : constant Boolean := True;
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   Support_Composite_Assign  : constant Boolean := True;
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   Support_Composite_Compare : constant Boolean := True;
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   Support_Long_Shifts       : constant Boolean := True;
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   Always_Compatible_Rep     : constant Boolean := True;
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   Suppress_Standard_Library : constant Boolean := False;
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   Use_Ada_Main_Program_Name : constant Boolean := False;
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   ZCX_By_Default            : constant Boolean := True;
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   GCC_ZCX_Support           : constant Boolean := False;
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   --------------------------
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   -- Underlying Priorities --
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   ---------------------------
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   --  Important note: this section of the file must come AFTER the
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   --  definition of the system implementation parameters to ensure
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   --  that the value of these parameters is available for analysis
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   --  of the declarations here (using Rtsfind at compile time).
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   --  The underlying priorities table provides a generalized mechanism
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   --  for mapping from Ada priorities to system priorities. In some
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   --  cases a 1-1 mapping is not the convenient or optimal choice.
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   --  For DEC Threads OpenVMS, we use the full range of 31 priorities
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   --  in the Ada model, but map them by compression onto the more limited
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   --  range of priorities available in OpenVMS.
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   --  To replace the default values of the Underlying_Priorities mapping,
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   --  copy this source file into your build directory, edit the file to
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   --  reflect your desired behavior, and recompile with the command:
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   --     $ gcc -c -O3 -gnatpgn system.ads
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   --  then recompile the run-time parts that depend on this package:
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   --     $ gnatmake -a -gnatn -O3 <your application>
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   --  then force rebuilding your application if you need different options:
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   --     $ gnatmake -f <your options> <your application>
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   type Priorities_Mapping is array (Any_Priority) of Integer;
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   pragma Suppress_Initialization (Priorities_Mapping);
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   --  Suppress initialization in case gnat.adc specifies Normalize_Scalars
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   Underlying_Priorities : constant Priorities_Mapping :=
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     (Priority'First => 16,
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      1  => 17,
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      2  => 18,
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      3  => 18,
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      4  => 18,
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      5  => 18,
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      6  => 19,
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      7  => 19,
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      8  => 19,
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      9  => 20,
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      10 => 20,
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      11 => 21,
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      12 => 21,
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      13 => 22,
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      14 => 23,
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      Default_Priority   => 24,
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      16 => 25,
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      17 => 25,
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      18 => 25,
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      19 => 26,
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      20 => 26,
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      21 => 26,
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      22 => 27,
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      23 => 27,
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      24 => 27,
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      25 => 28,
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      26 => 28,
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      27 => 29,
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      28 => 29,
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      29 => 30,
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      Priority'Last      => 30,
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      Interrupt_Priority => 31);
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   ----------------------------
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   -- Special VMS Interfaces --
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   ----------------------------
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   procedure Lib_Stop (I : Integer);
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   pragma Interface (C, Lib_Stop);
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   pragma Import_Procedure (Lib_Stop, "LIB$STOP", Mechanism => (Value));
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   --  Interface to VMS condition handling. Used by RTSfind and pragma
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   --  {Import,Export}_Exception. Put here because this is the only
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   --  VMS specific package that doesn't drag in tasking.
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   ADA_GNAT : constant Boolean := True;
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   pragma Export_Object (ADA_GNAT, "ADA$GNAT");
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   --  Ubiquitous global symbol identifying a GNAT compiled image to VMS Debug.
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   --  Do not remove!
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end System;

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