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diff --git a/gcc/ada/5xsystem.ads b/gcc/ada/5xsystem.ads new file mode 100644 index 00000000000..c7fa20898df --- /dev/null +++ b/gcc/ada/5xsystem.ads @@ -0,0 +1,236 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME COMPONENTS -- +-- -- +-- S Y S T E M -- +-- -- +-- S p e c -- +-- (OpenVMS GCC_ZCX 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 := 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 := 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 <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; |