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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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--                            (Compiler 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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--  This version of System is a generic version that is used in building the
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--  compiler. Right now, we have a host/target problem if we try to use the
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--  "proper" System, and since the compiler itself does not care about most
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--  System parameters, this generic version works fine.
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pragma Restrictions (No_Implicit_Dynamic_Code);
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--  We want to avoid trampolines in the compiler, so it can be used in systems
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--  which prevent execution of code on the stack, e.g. in windows environments
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--  with DEP (Data Execution Protection) enabled.
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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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   --  Note that we do NOT add pragma Preelaborable_Initialization in this
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   --  version of System, since it is used for the compiler only, and typical
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   --  earlier bootstrap compilers don't support this pragma. We don't need
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   --  it in this context, so there is no problem in omitting it.
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   Null_Address : constant Address;
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   Storage_Unit : constant := Standard'Storage_Unit;
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   Word_Size    : constant := Standard'Word_Size;
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   Memory_Size  : constant := 2 ** Standard'Address_Size;
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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 :=
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                         Bit_Order'Val (Standard'Default_Bit_Order);
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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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   --  This version of system.ads is used only for building the compiler.
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   --  We really ought to use the proper target system (i.e. the one that
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   --  corresponds to the host for the compiler), but that causes as yet
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   --  unsolved makefile problems. For the most part the setting of these
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   --  parameters is not too critical for the compiler version (e.g. we
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   --  do not use floating-point anyway in the compiler).
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   AAMP                      : constant Boolean := False;
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   Backend_Divide_Checks     : constant Boolean := False;
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   Backend_Overflow_Checks   : constant Boolean := False;
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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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   OpenVMS                   : constant Boolean := False;
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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 := False;
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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 := False;
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   GCC_ZCX_Support           : constant Boolean := False;
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   --  Obsolete entries, to be removed eventually (bootstrap issues!)
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   Front_End_ZCX_Support     : constant Boolean := False;
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   High_Integrity_Mode       : constant Boolean := False;
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   Long_Shifts_Inlined       : constant Boolean := True;
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   Functions_Return_By_DSP   : constant Boolean := False;
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end System;

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