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

--                                                                          --

--                        GNAT RUN-TIME COMPONENTS                          --

--                                                                          --

--                               S Y S T E M                                --

--                                                                          --

--                                 S p e c                                  --

--                         (Darwin/x86_64 Version)                          --

--                                                                          --

--          Copyright (C) 1992-2011, 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.      --

--                                                                          --

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

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;

   pragma Preelaborable_Initialization (Address);

   Null_Address : constant Address;

   Storage_Unit : constant := 8;

   Word_Size    : constant := 64;

   Memory_Size  : constant := 2 ** 64;

   --  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 := Low_Order_First;

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

   --  Priority-related Declarations (RM D.1)

   --  The values defined here are derived from the following Darwin

   --  sources:

   --

   --  Libc/pthreads/pthread.c

   --    pthread_init calls host_info to retrieve the HOST_PRIORITY_INFO.

   --    This file includes "pthread_internals".

   --  Libc/pthreads/pthread_internals.h

   --    This file includes <mach/mach.h>.

   --  xnu/osfmk/mach/mach.h

   --    This file includes <mach/mach_types.h>.

   --  xnu/osfmk/mach/mach_types.h

   --    This file includes <mach/host_info.h>.

   --  xnu/osfmk/mach/host_info.h

   --    This file contains the definition of the host_info_t data structure

   --    and the function prototype for host_info.

   --  xnu/osfmk/kern/host.c

   --    This file defines the function host_info which sets the

   --    priority_info field of struct host_info_t. This file includes

   --    <kern/processor.h>.

   --  xnu/osfmk/kern/processor.h

   --    This file includes <kern/sched.h>.

   --  xnu/osfmk/kern/sched.h

   --    This file defines the values for each level of priority.

   Max_Interrupt_Priority : constant Positive := 63;

   Max_Priority           : constant Positive := Max_Interrupt_Priority - 1;

   subtype Any_Priority is Integer range 0 .. Max_Interrupt_Priority;

   subtype Priority is Any_Priority range 0 .. Max_Priority;

   subtype Interrupt_Priority is Any_Priority

     range Priority'Last + 1 .. Max_Interrupt_Priority;

   Default_Priority : constant Priority :=

     (Priority'Last - Priority'First) / 2;

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.

   Backend_Divide_Checks     : constant Boolean := False;

   Backend_Overflow_Checks   : constant Boolean := True;

   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;

   Preallocated_Stacks       : constant Boolean := False;

   Signed_Zeros              : constant Boolean := True;

   Stack_Check_Default       : constant Boolean := False;

   Stack_Check_Probes        : constant Boolean := True;

   Stack_Check_Limits        : constant Boolean := False;

   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 := False;

   Suppress_Standard_Library : constant Boolean := False;

   Use_Ada_Main_Program_Name : constant Boolean := False;

   ZCX_By_Default            : constant Boolean := True;

end System;