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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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--                            (Windows 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 := True;
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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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   Preallocated_Stacks       : constant Boolean := False;
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   Signed_Zeros              : constant Boolean := True;
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   Stack_Check_Default       : constant Boolean := False;
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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 := False;
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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 := False;
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   GCC_ZCX_Support           : constant Boolean := True;
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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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   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 ..
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      Default_Priority - 8    => -15,
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      Default_Priority - 7    => -7,
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      Default_Priority - 6    => -6,
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      Default_Priority - 5    => -5,
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      Default_Priority - 4    => -4,
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      Default_Priority - 3    => -3,
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      Default_Priority - 2    => -2,
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      Default_Priority - 1    => -1,
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      Default_Priority        => 0,
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      Default_Priority + 1    => 1,
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      Default_Priority + 2    => 2,
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      Default_Priority + 3    => 3,
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      Default_Priority + 4    => 4,
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      Default_Priority + 5    => 5,
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      Default_Priority + 6 ..
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      Priority'Last           => 6,
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      Interrupt_Priority      => 15);
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   --  The default mapping preserves the standard 31 priorities of the Ada
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   --  model, but maps them using compression onto the 7 priority levels
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   --  available in NT and on the 16 priority levels available in 2000/XP.
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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 using Makefile.adalib
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   --  which can be found under the adalib directory of your gnat installation
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   pragma Linker_Options ("-Wl,--stack=0x2000000");
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   --  This is used to change the default stack (32 MB) size for non tasking
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   --  programs. We change this value for GNAT on Windows here because the
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   --  binutils on this platform have switched to a too low value for Ada
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   --  programs. Note that we also set the stack size for tasking programs in
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   --  System.Task_Primitives.Operations.
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end System;

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