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------------------------------------------------------------------------------

--                                                                          --

--                        GNAT RUN-TIME COMPONENTS                          --

--                                                                          --

--                               S Y S T E M                                --

--                                                                          --

--                                 S p e c                                  --

--                            (Compiler Version)                            --

--                                                                          --

--          Copyright (C) 1992-2009, 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 --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  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.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  This version of System is a generic version that is used in building the

--  compiler. Right now, we have a host/target problem if we try to use the

--  "proper" System, and since the compiler itself does not care about most

--  System parameters, this generic version works fine.

pragma Restrictions (No_Implicit_Dynamic_Code);

--  We want to avoid trampolines in the compiler, so it can be used in systems

--  which prevent execution of code on the stack, e.g. in windows environments

--  with DEP (Data Execution Protection) enabled.

package System is

   pragma Pure;

   --  Note that we take advantage of the implementation permission to make

   --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada

   --  2005, this is Pure in any case (AI-362).

   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 := 2 ** Integer'Size - 1;

   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 := 0.01;

   --  Storage-related Declarations

   type Address is private;

   --  Note that we do NOT add pragma Preelaborable_Initialization in this

   --  version of System, since it is used for the compiler only, and typical

   --  earlier bootstrap compilers don't support this pragma. We don't need

   --  it in this context, so there is no problem in omitting it.

   Null_Address : constant Address;

   Storage_Unit : constant := Standard'Storage_Unit;

   Word_Size    : constant := Standard'Word_Size;

   Memory_Size  : constant := 2 ** Standard'Address_Size;

   --  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 :=

                         Bit_Order'Val (Standard'Default_Bit_Order);

   pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning

   --  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.

   --  This version of system.ads is used only for building the compiler.

   --  We really ought to use the proper target system (i.e. the one that

   --  corresponds to the host for the compiler), but that causes as yet

   --  unsolved makefile problems. For the most part the setting of these

   --  parameters is not too critical for the compiler version (e.g. we

   --  do not use floating-point anyway in the compiler).

   AAMP                      : constant Boolean := False;

   Backend_Divide_Checks     : constant Boolean := False;

   Backend_Overflow_Checks   : constant Boolean := False;

   Command_Line_Args         : constant Boolean := True;

   Configurable_Run_Time     : constant Boolean := False;

   Denorm                    : constant Boolean := True;

   Duration_32_Bits          : constant Boolean := False;

   Exit_Status_Supported     : constant Boolean := True;

   Fractional_Fixed_Ops      : constant Boolean := False;

   Frontend_Layout           : constant Boolean := False;

   Machine_Overflows         : constant Boolean := False;

   Machine_Rounds            : constant Boolean := True;

   OpenVMS                   : constant Boolean := False;

   Preallocated_Stacks       : constant Boolean := False;

   Signed_Zeros              : constant Boolean := True;

   Stack_Check_Default       : constant Boolean := False;

   Stack_Check_Probes        : constant Boolean := False;

   Stack_Check_Limits        : constant Boolean := False;

   Support_64_Bit_Divides    : constant Boolean := True;

   Support_Aggregates        : constant Boolean := True;

   Support_Composite_Assign  : constant Boolean := True;

   Support_Composite_Compare : constant Boolean := True;

   Support_Long_Shifts       : constant Boolean := True;

   Always_Compatible_Rep     : constant Boolean := True;

   Suppress_Standard_Library : constant Boolean := False;

   Use_Ada_Main_Program_Name : constant Boolean := False;

   ZCX_By_Default            : constant Boolean := False;

   GCC_ZCX_Support           : constant Boolean := False;

   --  Obsolete entries, to be removed eventually (bootstrap issues!)

   Front_End_ZCX_Support     : constant Boolean := False;

   High_Integrity_Mode       : constant Boolean := False;

   Long_Shifts_Inlined       : constant Boolean := True;

   Functions_Return_By_DSP   : constant Boolean := False;

end System;