------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- S Y S T E M -- -- -- -- S p e c -- -- (DEC Unix Version) -- -- -- -- Copyright (C) 1992-2005 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 2, 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. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNAT; see file COPYING. If not, write -- -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, USA. -- -- -- -- As a special exception, if other files instantiate generics from this -- -- unit, or you link this unit with other files to produce an executable, -- -- this unit does not by itself cause the resulting executable to be -- -- covered by the GNU General Public License. This exception does not -- -- however invalidate any other reasons why the executable file might be -- -- covered by the GNU Public License. -- -- -- -- 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 (System); -- 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 := Integer'Last; 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 := 1.0 / 1024.0; -- Storage-related Declarations type Address is private; 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; -- Priority-related Declarations (RM D.1) Max_Priority : constant Positive := 60; Max_Interrupt_Priority : constant Positive := 63; subtype Any_Priority is Integer range 0 .. 63; subtype Priority is Any_Priority range 0 .. 60; subtype Interrupt_Priority is Any_Priority range 61 .. 63; Default_Priority : constant Priority := 30; 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. AAMP : constant Boolean := False; Backend_Divide_Checks : constant Boolean := False; Backend_Overflow_Checks : constant Boolean := False; Command_Line_Args : constant Boolean := True; Compiler_System_Version : constant Boolean := False; Configurable_Run_Time : constant Boolean := False; Denorm : constant Boolean := False; Duration_32_Bits : constant Boolean := False; Exit_Status_Supported : constant Boolean := True; Fractional_Fixed_Ops : constant Boolean := False; Frontend_Layout : constant Boolean := False; Functions_Return_By_DSP : 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 := True; Stack_Check_Probes : constant Boolean := True; 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; Suppress_Standard_Library : constant Boolean := False; Use_Ada_Main_Program_Name : constant Boolean := False; ZCX_By_Default : constant Boolean := True; GCC_ZCX_Support : constant Boolean := True; Front_End_ZCX_Support : constant Boolean := False; -- Obsolete entries, to be removed eventually (bootstrap issues!) High_Integrity_Mode : constant Boolean := False; Long_Shifts_Inlined : constant Boolean := True; -- Note: Denorm is False because denormals are only handled properly -- if the -mieee switch is set, and we do not require this usage. --------------------------- -- Underlying Priorities -- --------------------------- -- Important note: this section of the file must come AFTER the -- definition of the system implementation parameters to ensure -- that the value of these parameters is available for analysis -- of the declarations here (using Rtsfind at compile time). -- The underlying priorities table provides a generalized mechanism -- for mapping from Ada priorities to system priorities. In some -- cases a 1-1 mapping is not the convenient or optimal choice. -- For Dec Unix 4.0d, we use a default 1-to-1 mapping that provides -- the full range of 64 priorities available from the operating system. -- On DU prior to 4.0d, less than 64 priorities are available so there -- are two possibilities: -- Limit your range of priorities to the range provided by the -- OS (e.g 16 .. 32 on 4.0b) -- Replace the standard table as described below -- To replace the default values of the Underlying_Priorities mapping, -- copy this source file into your build directory, edit the file to -- reflect your desired behavior, and recompile with the command: -- $ gcc -c -O3 -gnatpgn system.ads -- then recompile the run-time parts that depend on this package: -- $ gnatmake -a -gnatn -O3 -- then force rebuilding your application if you need different options: -- $ gnatmake -f type Priorities_Mapping is array (Any_Priority) of Integer; pragma Suppress_Initialization (Priorities_Mapping); -- Suppress initialization in case gnat.adc specifies Normalize_Scalars Underlying_Priorities : constant Priorities_Mapping := (Priority'First => 0, 1 => 1, 2 => 2, 3 => 3, 4 => 4, 5 => 5, 6 => 6, 7 => 7, 8 => 8, 9 => 9, 10 => 10, 11 => 11, 12 => 12, 13 => 13, 14 => 14, 15 => 15, 16 => 16, 17 => 17, 18 => 18, 19 => 19, 20 => 20, 21 => 21, 22 => 22, 23 => 23, 24 => 24, 25 => 25, 26 => 26, 27 => 27, 28 => 28, 29 => 29, Default_Priority => 30, 31 => 31, 32 => 32, 33 => 33, 34 => 34, 35 => 35, 36 => 36, 37 => 37, 38 => 38, 39 => 39, 40 => 40, 41 => 41, 42 => 42, 43 => 43, 44 => 44, 45 => 45, 46 => 46, 47 => 47, 48 => 48, 49 => 49, 50 => 50, 51 => 51, 52 => 52, 53 => 53, 54 => 54, 55 => 55, 56 => 56, 57 => 57, 58 => 58, 59 => 59, Priority'Last => 60, 61 => 61, 62 => 62, Interrupt_Priority'Last => 63); end System;