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) 1992-2020, 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 := -2 ** (Standard'Max_Integer_Size - 1); 52 Max_Int : constant := 2 ** (Standard'Max_Integer_Size - 1) - 1; 53 54 Max_Binary_Modulus : constant := 2 ** Standard'Max_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 := Standard'Max_Integer_Size - 1; 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 := Standard'Word_Size; 73 Memory_Size : constant := 2 ** Word_Size; 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 := Low_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 Machine_Overflows : constant Boolean := False; 129 Machine_Rounds : constant Boolean := True; 130 Preallocated_Stacks : constant Boolean := False; 131 Signed_Zeros : constant Boolean := True; 132 Stack_Check_Default : constant Boolean := False; 133 Stack_Check_Probes : constant Boolean := True; 134 Stack_Check_Limits : constant Boolean := False; 135 Support_Aggregates : constant Boolean := True; 136 Support_Atomic_Primitives : constant Boolean := True; 137 Support_Composite_Assign : constant Boolean := True; 138 Support_Composite_Compare : constant Boolean := True; 139 Support_Long_Shifts : constant Boolean := True; 140 Always_Compatible_Rep : constant Boolean := False; 141 Suppress_Standard_Library : constant Boolean := False; 142 Use_Ada_Main_Program_Name : constant Boolean := False; 143 Frontend_Exceptions : constant Boolean := False; 144 ZCX_By_Default : constant Boolean := True; 145 146 --------------------------- 147 -- Underlying Priorities -- 148 --------------------------- 149 150 -- Important note: this section of the file must come AFTER the 151 -- definition of the system implementation parameters to ensure 152 -- that the value of these parameters is available for analysis 153 -- of the declarations here (using Rtsfind at compile time). 154 155 -- The underlying priorities table provides a generalized mechanism 156 -- for mapping from Ada priorities to system priorities. In some 157 -- cases a 1-1 mapping is not the convenient or optimal choice. 158 159 type Priorities_Mapping is array (Any_Priority) of Integer; 160 pragma Suppress_Initialization (Priorities_Mapping); 161 -- Suppress initialization in case gnat.adc specifies Normalize_Scalars 162 163 Underlying_Priorities : constant Priorities_Mapping := 164 (Priority'First .. 165 Default_Priority - 8 => -15, 166 Default_Priority - 7 => -7, 167 Default_Priority - 6 => -6, 168 Default_Priority - 5 => -5, 169 Default_Priority - 4 => -4, 170 Default_Priority - 3 => -3, 171 Default_Priority - 2 => -2, 172 Default_Priority - 1 => -1, 173 Default_Priority => 0, 174 Default_Priority + 1 => 1, 175 Default_Priority + 2 => 2, 176 Default_Priority + 3 => 3, 177 Default_Priority + 4 => 4, 178 Default_Priority + 5 => 5, 179 Default_Priority + 6 .. 180 Priority'Last => 6, 181 Interrupt_Priority => 15); 182 -- The default mapping preserves the standard 31 priorities of the Ada 183 -- model, but maps them using compression onto the 7 priority levels 184 -- available in NT and on the 16 priority levels available in 2000/XP. 185 186 pragma Linker_Options ("-Wl,--stack=0x2000000"); 187 -- This is used to change the default stack (32 MB) size for non tasking 188 -- programs. We change this value for GNAT on Windows here because the 189 -- binutils on this platform have switched to a too low value for Ada 190 -- programs. Note that we also set the stack size for tasking programs in 191 -- System.Task_Primitives.Operations. 192 193end System; 194