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-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME COMPONENTS --
--- --
--- S Y S T E M --
--- --
--- S p e c --
--- (OpenVMS DEC Threads Version) --
--- --
--- Copyright (C) 2002-2003 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;
- 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 := False;
- GCC_ZCX_Support : constant Boolean := False;
- 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;
-
- --------------------------
- -- 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 <your application>
-
- -- then force rebuilding your application if you need different options:
-
- -- $ gnatmake -f <your options> <your application>
-
- 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;
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