------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- S Y S T E M -- -- -- -- S p e c -- -- (OpenVMS DEC Threads Version) -- -- -- -- Copyright (C) 1992-2004 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(36) 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 := 0.01; -- Storage-related Declarations type Address is private; Null_Address : constant Address; Storage_Unit : constant := 8; Word_Size : constant := 32; Memory_Size : constant := 2 ** 32; -- 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 := 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. 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 := 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 := True; 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 := False; Front_End_ZCX_Support : constant Boolean := True; -- Obsolete entries, to be removed eventually (bootstrap issues!) High_Integrity_Mode : constant Boolean := False; Long_Shifts_Inlined : constant Boolean := False; -------------------------- -- 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 Threads OpenVMS, we use the full range of 31 priorities -- in the Ada model, but map them by compression onto the more limited -- range of priorities available in OpenVMS. -- 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 => 16, 1 => 17, 2 => 18, 3 => 18, 4 => 18, 5 => 18, 6 => 19, 7 => 19, 8 => 19, 9 => 20, 10 => 20, 11 => 21, 12 => 21, 13 => 22, 14 => 23, Default_Priority => 24, 16 => 25, 17 => 25, 18 => 25, 19 => 26, 20 => 26, 21 => 26, 22 => 27, 23 => 27, 24 => 27, 25 => 28, 26 => 28, 27 => 29, 28 => 29, 29 => 30, Priority'Last => 30, Interrupt_Priority => 31); ---------------------------- -- Special VMS Interfaces -- ---------------------------- procedure Lib_Stop (I : in Integer); pragma Interface (C, Lib_Stop); pragma Import_Procedure (Lib_Stop, "LIB$STOP", Mechanism => (Value)); -- Interface to VMS condition handling. Used by RTSfind and pragma -- {Import,Export}_Exception. Put here because this is the only -- VMS specific package that doesn't drag in tasking. end System;