1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME COMPONENTS -- 4-- -- 5-- S Y S T E M -- 6-- -- 7-- S p e c -- 8-- (Windows Version) -- 9-- -- 10-- Copyright (C) 1992-2012, 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 type Name is (SYSTEM_NAME_GNAT); 44 System_Name : constant Name := SYSTEM_NAME_GNAT; 45 46 -- System-Dependent Named Numbers 47 48 Min_Int : constant := Long_Long_Integer'First; 49 Max_Int : constant := Long_Long_Integer'Last; 50 51 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size; 52 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1; 53 54 Max_Base_Digits : constant := Long_Long_Float'Digits; 55 Max_Digits : constant := Long_Long_Float'Digits; 56 57 Max_Mantissa : constant := 63; 58 Fine_Delta : constant := 2.0 ** (-Max_Mantissa); 59 60 Tick : constant := 0.01; 61 62 -- Storage-related Declarations 63 64 type Address is private; 65 pragma Preelaborable_Initialization (Address); 66 Null_Address : constant Address; 67 68 Storage_Unit : constant := 8; 69 Word_Size : constant := 64; 70 Memory_Size : constant := 2 ** 64; 71 72 -- Address comparison 73 74 function "<" (Left, Right : Address) return Boolean; 75 function "<=" (Left, Right : Address) return Boolean; 76 function ">" (Left, Right : Address) return Boolean; 77 function ">=" (Left, Right : Address) return Boolean; 78 function "=" (Left, Right : Address) return Boolean; 79 80 pragma Import (Intrinsic, "<"); 81 pragma Import (Intrinsic, "<="); 82 pragma Import (Intrinsic, ">"); 83 pragma Import (Intrinsic, ">="); 84 pragma Import (Intrinsic, "="); 85 86 -- Other System-Dependent Declarations 87 88 type Bit_Order is (High_Order_First, Low_Order_First); 89 Default_Bit_Order : constant Bit_Order := Low_Order_First; 90 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning 91 92 -- Priority-related Declarations (RM D.1) 93 94 Max_Priority : constant Positive := 30; 95 Max_Interrupt_Priority : constant Positive := 31; 96 97 subtype Any_Priority is Integer range 0 .. 31; 98 subtype Priority is Any_Priority range 0 .. 30; 99 subtype Interrupt_Priority is Any_Priority range 31 .. 31; 100 101 Default_Priority : constant Priority := 15; 102 103private 104 105 type Address is mod Memory_Size; 106 Null_Address : constant Address := 0; 107 108 -------------------------------------- 109 -- System Implementation Parameters -- 110 -------------------------------------- 111 112 -- These parameters provide information about the target that is used 113 -- by the compiler. They are in the private part of System, where they 114 -- can be accessed using the special circuitry in the Targparm unit 115 -- whose source should be consulted for more detailed descriptions 116 -- of the individual switch values. 117 118 Backend_Divide_Checks : constant Boolean := False; 119 Backend_Overflow_Checks : constant Boolean := True; 120 Command_Line_Args : constant Boolean := True; 121 Configurable_Run_Time : constant Boolean := False; 122 Denorm : constant Boolean := True; 123 Duration_32_Bits : constant Boolean := False; 124 Exit_Status_Supported : constant Boolean := True; 125 Fractional_Fixed_Ops : constant Boolean := False; 126 Frontend_Layout : constant Boolean := False; 127 Machine_Overflows : constant Boolean := False; 128 Machine_Rounds : constant Boolean := True; 129 Preallocated_Stacks : constant Boolean := False; 130 Signed_Zeros : constant Boolean := True; 131 Stack_Check_Default : constant Boolean := False; 132 Stack_Check_Probes : constant Boolean := True; 133 Stack_Check_Limits : constant Boolean := False; 134 Support_Aggregates : constant Boolean := True; 135 Support_Atomic_Primitives : constant Boolean := True; 136 Support_Composite_Assign : constant Boolean := True; 137 Support_Composite_Compare : constant Boolean := True; 138 Support_Long_Shifts : constant Boolean := True; 139 Always_Compatible_Rep : constant Boolean := False; 140 Suppress_Standard_Library : constant Boolean := False; 141 Use_Ada_Main_Program_Name : constant Boolean := False; 142 ZCX_By_Default : constant Boolean := True; 143 144 --------------------------- 145 -- Underlying Priorities -- 146 --------------------------- 147 148 -- Important note: this section of the file must come AFTER the 149 -- definition of the system implementation parameters to ensure 150 -- that the value of these parameters is available for analysis 151 -- of the declarations here (using Rtsfind at compile time). 152 153 -- The underlying priorities table provides a generalized mechanism 154 -- for mapping from Ada priorities to system priorities. In some 155 -- cases a 1-1 mapping is not the convenient or optimal choice. 156 157 type Priorities_Mapping is array (Any_Priority) of Integer; 158 pragma Suppress_Initialization (Priorities_Mapping); 159 -- Suppress initialization in case gnat.adc specifies Normalize_Scalars 160 161 Underlying_Priorities : constant Priorities_Mapping := 162 (Priority'First .. 163 Default_Priority - 8 => -15, 164 Default_Priority - 7 => -7, 165 Default_Priority - 6 => -6, 166 Default_Priority - 5 => -5, 167 Default_Priority - 4 => -4, 168 Default_Priority - 3 => -3, 169 Default_Priority - 2 => -2, 170 Default_Priority - 1 => -1, 171 Default_Priority => 0, 172 Default_Priority + 1 => 1, 173 Default_Priority + 2 => 2, 174 Default_Priority + 3 => 3, 175 Default_Priority + 4 => 4, 176 Default_Priority + 5 => 5, 177 Default_Priority + 6 .. 178 Priority'Last => 6, 179 Interrupt_Priority => 15); 180 -- The default mapping preserves the standard 31 priorities of the Ada 181 -- model, but maps them using compression onto the 7 priority levels 182 -- available in NT and on the 16 priority levels available in 2000/XP. 183 184 -- To replace the default values of the Underlying_Priorities mapping, 185 -- copy this source file into your build directory, edit the file to 186 -- reflect your desired behavior, and recompile using Makefile.adalib 187 -- which can be found under the adalib directory of your gnat installation 188 189 pragma Linker_Options ("-Wl,--stack=0x2000000"); 190 -- This is used to change the default stack (32 MB) size for non tasking 191 -- programs. We change this value for GNAT on Windows here because the 192 -- binutils on this platform have switched to a too low value for Ada 193 -- programs. Note that we also set the stack size for tasking programs in 194 -- System.Task_Primitives.Operations. 195 196end System; 197