1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME COMPONENTS -- 4-- -- 5-- S Y S T E M -- 6-- -- 7-- S p e c -- 8-- (Compiler Version) -- 9-- -- 10-- Copyright (C) 1992-2015, 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 37-- This version of System is a generic version that is used in building the 38-- compiler. Right now, we have a host/target problem if we try to use the 39-- "proper" System, and since the compiler itself does not care about most 40-- System parameters, this generic version works fine. 41 42pragma Restrictions (No_Implicit_Dynamic_Code); 43-- We want to avoid trampolines in the compiler, so it can be used in systems 44-- which prevent execution of code on the stack, e.g. in windows environments 45-- with DEP (Data Execution Protection) enabled. 46 47package System is 48 pragma Pure; 49 -- Note that we take advantage of the implementation permission to make 50 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada 51 -- 2005, this is Pure in any case (AI-362). 52 53 pragma No_Elaboration_Code_All; 54 -- Allow the use of that restriction in units that WITH this unit 55 56 type Name is (SYSTEM_NAME_GNAT); 57 System_Name : constant Name := SYSTEM_NAME_GNAT; 58 59 -- System-Dependent Named Numbers 60 61 Min_Int : constant := Long_Long_Integer'First; 62 Max_Int : constant := Long_Long_Integer'Last; 63 64 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size; 65 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1; 66 67 Max_Base_Digits : constant := Long_Long_Float'Digits; 68 Max_Digits : constant := Long_Long_Float'Digits; 69 70 Max_Mantissa : constant := 63; 71 Fine_Delta : constant := 2.0 ** (-Max_Mantissa); 72 73 Tick : constant := 0.01; 74 75 -- Storage-related Declarations 76 77 type Address is private; 78 -- Note that we do NOT add pragma Preelaborable_Initialization in this 79 -- version of System, since it is used for the compiler only, and typical 80 -- earlier bootstrap compilers don't support this pragma. We don't need 81 -- it in this context, so there is no problem in omitting it. 82 Null_Address : constant Address; 83 84 Storage_Unit : constant := Standard'Storage_Unit; 85 Word_Size : constant := Standard'Word_Size; 86 Memory_Size : constant := 2 ** Standard'Address_Size; 87 88 -- Address comparison 89 90 function "<" (Left, Right : Address) return Boolean; 91 function "<=" (Left, Right : Address) return Boolean; 92 function ">" (Left, Right : Address) return Boolean; 93 function ">=" (Left, Right : Address) return Boolean; 94 function "=" (Left, Right : Address) return Boolean; 95 96 pragma Import (Intrinsic, "<"); 97 pragma Import (Intrinsic, "<="); 98 pragma Import (Intrinsic, ">"); 99 pragma Import (Intrinsic, ">="); 100 pragma Import (Intrinsic, "="); 101 102 -- Other System-Dependent Declarations 103 104 type Bit_Order is (High_Order_First, Low_Order_First); 105 Default_Bit_Order : constant Bit_Order := 106 Bit_Order'Val (Standard'Default_Bit_Order); 107 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning 108 109 -- Priority-related Declarations (RM D.1) 110 111 Max_Priority : constant Positive := 30; 112 Max_Interrupt_Priority : constant Positive := 31; 113 114 subtype Any_Priority is Integer range 0 .. 31; 115 subtype Priority is Any_Priority range 0 .. 30; 116 subtype Interrupt_Priority is Any_Priority range 31 .. 31; 117 118 Default_Priority : constant Priority := 15; 119 120private 121 122 type Address is mod Memory_Size; 123 Null_Address : constant Address := 0; 124 125 -------------------------------------- 126 -- System Implementation Parameters -- 127 -------------------------------------- 128 129 -- These parameters provide information about the target that is used by 130 -- the compiler. They are in the private part of System, where they can be 131 -- accessed using the special circuitry in the Targparm unit whose source 132 -- should be consulted for more detailed descriptions of the individual 133 -- switch values. 134 135 -- This version of system.ads is used only for building the compiler. 136 -- We really ought to use the proper target system (i.e. the one that 137 -- corresponds to the host for the compiler), but that causes as yet 138 -- unsolved makefile problems. For the most part the setting of these 139 -- parameters is not too critical for the compiler version (e.g. we 140 -- do not use floating-point anyway in the compiler). 141 142 AAMP : constant Boolean := False; 143 Backend_Divide_Checks : constant Boolean := False; 144 Backend_Overflow_Checks : constant Boolean := False; 145 Command_Line_Args : constant Boolean := True; 146 Configurable_Run_Time : constant Boolean := False; 147 Denorm : constant Boolean := True; 148 Duration_32_Bits : constant Boolean := False; 149 Exit_Status_Supported : constant Boolean := True; 150 Fractional_Fixed_Ops : constant Boolean := False; 151 Frontend_Layout : constant Boolean := False; 152 Machine_Overflows : constant Boolean := False; 153 Machine_Rounds : constant Boolean := True; 154 Preallocated_Stacks : constant Boolean := False; 155 Signed_Zeros : constant Boolean := True; 156 Stack_Check_Default : constant Boolean := False; 157 Stack_Check_Probes : constant Boolean := False; 158 Stack_Check_Limits : constant Boolean := False; 159 Support_Aggregates : constant Boolean := True; 160 Support_Composite_Assign : constant Boolean := True; 161 Support_Composite_Compare : constant Boolean := True; 162 Support_Long_Shifts : constant Boolean := True; 163 Always_Compatible_Rep : constant Boolean := True; 164 Suppress_Standard_Library : constant Boolean := False; 165 Use_Ada_Main_Program_Name : constant Boolean := False; 166 Frontend_Exceptions : constant Boolean := True; 167 ZCX_By_Default : constant Boolean := False; 168 169 -- Obsolete entries, to be removed eventually (bootstrap issues) 170 171 Front_End_ZCX_Support : constant Boolean := False; 172 High_Integrity_Mode : constant Boolean := False; 173 Long_Shifts_Inlined : constant Boolean := True; 174 Functions_Return_By_DSP : constant Boolean := False; 175 Support_64_Bit_Divides : constant Boolean := True; 176 GCC_ZCX_Support : constant Boolean := False; 177 178end System; 179