1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME COMPONENTS -- 4-- -- 5-- S Y S T E M -- 6-- -- 7-- S p e c -- 8-- (HP-UX Version) -- 9-- -- 10-- Copyright (C) 1992-2016, Free Software Foundation, Inc. -- 11-- -- 12-- This specification is derived from the Ada Reference Manual for use with -- 13-- GNAT. The copyright notice above, and the license provisions that follow -- 14-- apply solely to the contents of the part following the private keyword. -- 15-- -- 16-- GNAT is free software; you can redistribute it and/or modify it under -- 17-- terms of the GNU General Public License as published by the Free Soft- -- 18-- ware Foundation; either version 3, or (at your option) any later ver- -- 19-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 20-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 21-- or FITNESS FOR A PARTICULAR PURPOSE. -- 22-- -- 23-- As a special exception under Section 7 of GPL version 3, you are granted -- 24-- additional permissions described in the GCC Runtime Library Exception, -- 25-- version 3.1, as published by the Free Software Foundation. -- 26-- -- 27-- You should have received a copy of the GNU General Public License and -- 28-- a copy of the GCC Runtime Library Exception along with this program; -- 29-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 30-- <http://www.gnu.org/licenses/>. -- 31-- -- 32-- GNAT was originally developed by the GNAT team at New York University. -- 33-- Extensive contributions were provided by Ada Core Technologies Inc. -- 34-- -- 35------------------------------------------------------------------------------ 36 37package System is 38 pragma Pure; 39 -- Note that we take advantage of the implementation permission to make 40 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada 41 -- 2005, this is Pure in any case (AI-362). 42 43 pragma No_Elaboration_Code_All; 44 -- Allow the use of that restriction in units that WITH this unit 45 46 type Name is (SYSTEM_NAME_GNAT); 47 System_Name : constant Name := SYSTEM_NAME_GNAT; 48 49 -- System-Dependent Named Numbers 50 51 Min_Int : constant := Long_Long_Integer'First; 52 Max_Int : constant := Long_Long_Integer'Last; 53 54 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size; 55 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1; 56 57 Max_Base_Digits : constant := Long_Long_Float'Digits; 58 Max_Digits : constant := Long_Long_Float'Digits; 59 60 Max_Mantissa : constant := 63; 61 Fine_Delta : constant := 2.0 ** (-Max_Mantissa); 62 63 Tick : constant := 0.01; 64 65 -- Storage-related Declarations 66 67 type Address is private; 68 pragma Preelaborable_Initialization (Address); 69 Null_Address : constant Address; 70 71 Storage_Unit : constant := 8; 72 Word_Size : constant := 32; 73 Memory_Size : constant := 2 ** 32; 74 75 -- Address comparison 76 77 function "<" (Left, Right : Address) return Boolean; 78 function "<=" (Left, Right : Address) return Boolean; 79 function ">" (Left, Right : Address) return Boolean; 80 function ">=" (Left, Right : Address) return Boolean; 81 function "=" (Left, Right : Address) return Boolean; 82 83 pragma Import (Intrinsic, "<"); 84 pragma Import (Intrinsic, "<="); 85 pragma Import (Intrinsic, ">"); 86 pragma Import (Intrinsic, ">="); 87 pragma Import (Intrinsic, "="); 88 89 -- Other System-Dependent Declarations 90 91 type Bit_Order is (High_Order_First, Low_Order_First); 92 Default_Bit_Order : constant Bit_Order := High_Order_First; 93 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning 94 95 -- Priority-related Declarations (RM D.1) 96 97 Max_Priority : constant Positive := 30; 98 Max_Interrupt_Priority : constant Positive := 31; 99 100 subtype Any_Priority is Integer range 0 .. 31; 101 subtype Priority is Any_Priority range 0 .. 30; 102 subtype Interrupt_Priority is Any_Priority range 31 .. 31; 103 104 Default_Priority : constant Priority := 15; 105 106private 107 108 type Address is mod Memory_Size; 109 Null_Address : constant Address := 0; 110 111 -------------------------------------- 112 -- System Implementation Parameters -- 113 -------------------------------------- 114 115 -- These parameters provide information about the target that is used 116 -- by the compiler. They are in the private part of System, where they 117 -- can be accessed using the special circuitry in the Targparm unit 118 -- whose source should be consulted for more detailed descriptions 119 -- of the individual switch values. 120 121 Backend_Divide_Checks : constant Boolean := False; 122 Backend_Overflow_Checks : constant Boolean := True; 123 Command_Line_Args : constant Boolean := True; 124 Configurable_Run_Time : constant Boolean := False; 125 Denorm : constant Boolean := True; 126 Duration_32_Bits : constant Boolean := False; 127 Exit_Status_Supported : constant Boolean := True; 128 Fractional_Fixed_Ops : constant Boolean := False; 129 Frontend_Layout : constant Boolean := False; 130 Machine_Overflows : constant Boolean := False; 131 Machine_Rounds : constant Boolean := True; 132 Preallocated_Stacks : constant Boolean := False; 133 Signed_Zeros : constant Boolean := True; 134 Stack_Check_Default : constant Boolean := False; 135 Stack_Check_Probes : constant Boolean := True; 136 Stack_Check_Limits : constant Boolean := False; 137 Support_Aggregates : constant Boolean := True; 138 Support_Composite_Assign : constant Boolean := True; 139 Support_Composite_Compare : constant Boolean := True; 140 Support_Long_Shifts : constant Boolean := True; 141 Always_Compatible_Rep : constant Boolean := False; 142 Suppress_Standard_Library : constant Boolean := False; 143 Use_Ada_Main_Program_Name : constant Boolean := False; 144 Frontend_Exceptions : constant Boolean := False; 145 ZCX_By_Default : constant Boolean := True; 146 147 -------------------------- 148 -- Underlying Priorities -- 149 --------------------------- 150 151 -- Important note: this section of the file must come AFTER the 152 -- definition of the system implementation parameters to ensure 153 -- that the value of these parameters is available for analysis 154 -- of the declarations here (using Rtsfind at compile time). 155 156 -- The underlying priorities table provides a generalized mechanism 157 -- for mapping from Ada priorities to system priorities. In some 158 -- cases a 1-1 mapping is not the convenient or optimal choice. 159 160 -- For HP/UX DCE Threads, we use the full range of 31 priorities 161 -- in the Ada model, but map them by compression onto the more limited 162 -- range of priorities available in HP/UX. 163 -- For POSIX Threads, this table is ignored. 164 165 -- To replace the default values of the Underlying_Priorities mapping, 166 -- copy this source file into your build directory, edit the file to 167 -- reflect your desired behavior, and recompile with the command: 168 169 -- $ gcc -c -O2 -gnatpgn system.ads 170 171 -- then recompile the run-time parts that depend on this package: 172 173 -- $ gnatmake -a -gnatn -O2 <your application> 174 175 -- then force rebuilding your application if you need different options: 176 177 -- $ gnatmake -f <your options> <your application> 178 179 type Priorities_Mapping is array (Any_Priority) of Integer; 180 pragma Suppress_Initialization (Priorities_Mapping); 181 -- Suppress initialization in case gnat.adc specifies Normalize_Scalars 182 183 Underlying_Priorities : constant Priorities_Mapping := 184 185 (Priority'First => 16, 186 187 1 => 17, 188 2 => 18, 189 3 => 18, 190 4 => 18, 191 5 => 18, 192 6 => 19, 193 7 => 19, 194 8 => 19, 195 9 => 20, 196 10 => 20, 197 11 => 21, 198 12 => 21, 199 13 => 22, 200 14 => 23, 201 202 Default_Priority => 24, 203 204 16 => 25, 205 17 => 25, 206 18 => 25, 207 19 => 26, 208 20 => 26, 209 21 => 26, 210 22 => 27, 211 23 => 27, 212 24 => 27, 213 25 => 28, 214 26 => 28, 215 27 => 29, 216 28 => 29, 217 29 => 30, 218 219 Priority'Last => 30, 220 221 Interrupt_Priority => 31); 222 223end System; 224