| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- S Y S T E M -- |
| -- -- |
| -- S p e c -- |
| -- (Compiler Version) -- |
| -- -- |
| -- Copyright (C) 1992-2021, 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 3, 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. -- |
| -- -- |
| -- As a special exception under Section 7 of GPL version 3, you are granted -- |
| -- additional permissions described in the GCC Runtime Library Exception, -- |
| -- version 3.1, as published by the Free Software Foundation. -- |
| -- -- |
| -- You should have received a copy of the GNU General Public License and -- |
| -- a copy of the GCC Runtime Library Exception along with this program; -- |
| -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This version of System is a generic version that is used in building the |
| -- compiler. Right now, we have a host/target problem if we try to use the |
| -- "proper" System, and since the compiler itself does not care about most |
| -- System parameters, this generic version works fine. |
| |
| pragma Restrictions (No_Implicit_Dynamic_Code); |
| -- We want to avoid trampolines in the compiler, so it can be used in systems |
| -- which prevent execution of code on the stack, e.g. in windows environments |
| -- with DEP (Data Execution Protection) enabled. |
| |
| pragma Restrictions (No_Finalization); |
| -- Use restriction No_Finalization to avoid pulling finalization (not allowed |
| -- in GNAT) inside sem_spark.adb, when defining type Perm_Tree_Access as an |
| -- access type on incomplete type Perm_Tree_Wrapper (which is required for |
| -- defining a recursive type). |
| |
| pragma Restrictions (No_Tasking); |
| -- Make it explicit that tasking is not used in the compiler, which also |
| -- allows generating simpler and more efficient code. |
| |
| package System is |
| pragma Pure; |
| -- Note that we take advantage of the implementation permission to make |
| -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada |
| -- 2005, this is Pure in any case (AI-362). |
| |
| pragma No_Elaboration_Code_All; |
| -- Allow the use of that restriction in units that WITH this unit |
| |
| 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 := 2 ** Integer'Size - 1; |
| |
| 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 := 0.01; |
| |
| -- Storage-related Declarations |
| |
| type Address is private; |
| -- Note that we do NOT add pragma Preelaborable_Initialization in this |
| -- version of System, since it is used for the compiler only, and typical |
| -- earlier bootstrap compilers don't support this pragma. We don't need |
| -- it in this context, so there is no problem in omitting it. |
| 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 := |
| Bit_Order'Val (Standard'Default_Bit_Order); |
| pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning |
| |
| -- Priority-related Declarations (RM D.1) |
| |
| Max_Priority : constant Positive := 30; |
| Max_Interrupt_Priority : constant Positive := 31; |
| |
| subtype Any_Priority is Integer range 0 .. 31; |
| subtype Priority is Any_Priority range 0 .. 30; |
| subtype Interrupt_Priority is Any_Priority range 31 .. 31; |
| |
| Default_Priority : constant Priority := 15; |
| |
| 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. |
| |
| -- This version of system.ads is used only for building the compiler. |
| -- We really ought to use the proper target system (i.e. the one that |
| -- corresponds to the host for the compiler), but that causes as yet |
| -- unsolved makefile problems. For the most part the setting of these |
| -- parameters is not too critical for the compiler version (e.g. we |
| -- do not use floating-point anyway in the compiler). |
| |
| Backend_Divide_Checks : constant Boolean := False; |
| Backend_Overflow_Checks : constant Boolean := False; |
| Command_Line_Args : constant Boolean := True; |
| Configurable_Run_Time : constant Boolean := False; |
| Denorm : constant Boolean := True; |
| Duration_32_Bits : constant Boolean := False; |
| Exit_Status_Supported : constant Boolean := True; |
| Machine_Overflows : constant Boolean := False; |
| Machine_Rounds : constant Boolean := True; |
| Preallocated_Stacks : constant Boolean := False; |
| Signed_Zeros : constant Boolean := True; |
| Stack_Check_Default : constant Boolean := False; |
| Stack_Check_Probes : constant Boolean := False; |
| Stack_Check_Limits : constant Boolean := False; |
| Support_Aggregates : constant Boolean := True; |
| Support_Composite_Assign : constant Boolean := True; |
| Support_Composite_Compare : constant Boolean := True; |
| Support_Long_Shifts : constant Boolean := True; |
| Always_Compatible_Rep : constant Boolean := True; |
| Suppress_Standard_Library : constant Boolean := False; |
| Use_Ada_Main_Program_Name : constant Boolean := False; |
| Frontend_Exceptions : constant Boolean := False; |
| ZCX_By_Default : constant Boolean := True; |
| |
| end System; |
