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Diffstat (limited to 'gcc/ada/5wsystem.ads')
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1 files changed, 201 insertions, 0 deletions
diff --git a/gcc/ada/5wsystem.ads b/gcc/ada/5wsystem.ads new file mode 100644 index 00000000000..70e11949afd --- /dev/null +++ b/gcc/ada/5wsystem.ads @@ -0,0 +1,201 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME COMPONENTS -- +-- -- +-- S Y S T E M -- +-- -- +-- S p e c -- +-- (NT Version) -- +-- -- +-- $Revision: 1.19 $ +-- -- +-- Copyright (C) 1992-2001 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. -- +-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- +-- -- +------------------------------------------------------------------------------ + +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 := Standard'Tick; + + -- Storage-related Declarations + + type Address is private; + Null_Address : constant Address; + + Storage_Unit : constant := Standard'Storage_Unit; + Word_Size : constant := Standard'Word_Size; + Memory_Size : constant := 2 ** Standard'Address_Size; + + -- 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 .. Standard'Max_Interrupt_Priority; + + subtype Priority is Any_Priority + range 0 .. Standard'Max_Priority; + + -- Functional notation is needed in the following to avoid visibility + -- problems when this package is compiled through rtsfind in the middle + -- of another compilation. + + subtype Interrupt_Priority is Any_Priority + range + Standard."+" (Standard'Max_Priority, 1) .. + Standard'Max_Interrupt_Priority; + + Default_Priority : constant Priority := + Standard."/" (Standard."+" (Priority'First, Priority'Last), 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. + + AAMP : constant Boolean := False; + Command_Line_Args : constant Boolean := True; + Denorm : constant Boolean := True; + Frontend_Layout : constant Boolean := False; + Functions_Return_By_DSP : constant Boolean := False; + Long_Shifts_Inlined : constant Boolean := True; + High_Integrity_Mode : constant Boolean := False; + Machine_Overflows : constant Boolean := False; + Machine_Rounds : constant Boolean := True; + OpenVMS : constant Boolean := False; + Signed_Zeros : constant Boolean := True; + Stack_Check_Default : constant Boolean := False; + Stack_Check_Probes : 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 := 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. + + type Priorities_Mapping is array (Any_Priority) of Integer; + pragma Suppress_Initialization (Priorities_Mapping); + -- Suppress initialization in case gnat.adc specifies Normalize_Scalars + + -- On NT, the default mapping preserves the standard 31 priorities + -- of the Ada model, but maps them using compression onto the 7 + -- priority levels available in NT. + + -- 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> + + Underlying_Priorities : constant Priorities_Mapping := + + (Priority'First .. 1 => -15, + + 2 .. Default_Priority - 2 => -2, + + Default_Priority - 1 => -1, + + Default_Priority => 0, + + Default_Priority + 1 .. 19 => 1, + + 20 .. Priority'Last => 2, + + Interrupt_Priority => 15); + +end System; |