185 lines
9.0 KiB
Ada
185 lines
9.0 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- S Y S T E M --
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-- --
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-- S p e c --
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-- (Compiler Version) --
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-- --
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-- Copyright (C) 1992-2020, Free Software Foundation, Inc. --
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-- --
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-- This specification is derived from the Ada Reference Manual for use with --
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-- GNAT. The copyright notice above, and the license provisions that follow --
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-- apply solely to the contents of the part following the private keyword. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This version of System is a generic version that is used in building the
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-- compiler. Right now, we have a host/target problem if we try to use the
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-- "proper" System, and since the compiler itself does not care about most
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-- System parameters, this generic version works fine.
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pragma Restrictions (No_Implicit_Dynamic_Code);
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-- We want to avoid trampolines in the compiler, so it can be used in systems
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-- which prevent execution of code on the stack, e.g. in windows environments
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-- with DEP (Data Execution Protection) enabled.
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pragma Restrictions (No_Finalization);
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-- Use restriction No_Finalization to avoid pulling finalization (not allowed
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-- in GNAT) inside sem_spark.adb, when defining type Perm_Tree_Access as an
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-- access type on incomplete type Perm_Tree_Wrapper (which is required for
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-- defining a recursive type).
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package System is
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pragma Pure;
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-- Note that we take advantage of the implementation permission to make
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-- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
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-- 2005, this is Pure in any case (AI-362).
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pragma No_Elaboration_Code_All;
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-- Allow the use of that restriction in units that WITH this unit
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type Name is (SYSTEM_NAME_GNAT);
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System_Name : constant Name := SYSTEM_NAME_GNAT;
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-- System-Dependent Named Numbers
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Min_Int : constant := Long_Long_Integer'First;
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Max_Int : constant := Long_Long_Integer'Last;
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Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
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Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
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Max_Base_Digits : constant := Long_Long_Float'Digits;
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Max_Digits : constant := Long_Long_Float'Digits;
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Max_Mantissa : constant := 63;
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Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
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Tick : constant := 0.01;
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-- Storage-related Declarations
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type Address is private;
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-- Note that we do NOT add pragma Preelaborable_Initialization in this
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-- version of System, since it is used for the compiler only, and typical
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-- earlier bootstrap compilers don't support this pragma. We don't need
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-- it in this context, so there is no problem in omitting it.
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Null_Address : constant Address;
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Storage_Unit : constant := Standard'Storage_Unit;
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Word_Size : constant := Standard'Word_Size;
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Memory_Size : constant := 2 ** Standard'Address_Size;
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-- Address comparison
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function "<" (Left, Right : Address) return Boolean;
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function "<=" (Left, Right : Address) return Boolean;
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function ">" (Left, Right : Address) return Boolean;
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function ">=" (Left, Right : Address) return Boolean;
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function "=" (Left, Right : Address) return Boolean;
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pragma Import (Intrinsic, "<");
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pragma Import (Intrinsic, "<=");
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pragma Import (Intrinsic, ">");
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pragma Import (Intrinsic, ">=");
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pragma Import (Intrinsic, "=");
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-- Other System-Dependent Declarations
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type Bit_Order is (High_Order_First, Low_Order_First);
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Default_Bit_Order : constant Bit_Order :=
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Bit_Order'Val (Standard'Default_Bit_Order);
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pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
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-- Priority-related Declarations (RM D.1)
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Max_Priority : constant Positive := 30;
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Max_Interrupt_Priority : constant Positive := 31;
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subtype Any_Priority is Integer range 0 .. 31;
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subtype Priority is Any_Priority range 0 .. 30;
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subtype Interrupt_Priority is Any_Priority range 31 .. 31;
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Default_Priority : constant Priority := 15;
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private
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type Address is mod Memory_Size;
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Null_Address : constant Address := 0;
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--------------------------------------
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-- System Implementation Parameters --
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--------------------------------------
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-- These parameters provide information about the target that is used by
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-- the compiler. They are in the private part of System, where they can be
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-- accessed using the special circuitry in the Targparm unit whose source
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-- should be consulted for more detailed descriptions of the individual
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-- switch values.
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-- This version of system.ads is used only for building the compiler.
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-- We really ought to use the proper target system (i.e. the one that
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-- corresponds to the host for the compiler), but that causes as yet
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-- unsolved makefile problems. For the most part the setting of these
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-- parameters is not too critical for the compiler version (e.g. we
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-- do not use floating-point anyway in the compiler).
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AAMP : constant Boolean := False;
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Backend_Divide_Checks : constant Boolean := False;
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Backend_Overflow_Checks : constant Boolean := False;
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Command_Line_Args : constant Boolean := True;
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Configurable_Run_Time : constant Boolean := False;
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Denorm : constant Boolean := True;
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Duration_32_Bits : constant Boolean := False;
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Exit_Status_Supported : constant Boolean := True;
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Fractional_Fixed_Ops : constant Boolean := False;
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Frontend_Layout : constant Boolean := False;
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Machine_Overflows : constant Boolean := False;
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Machine_Rounds : constant Boolean := True;
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Preallocated_Stacks : constant Boolean := False;
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Signed_Zeros : constant Boolean := True;
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Stack_Check_Default : constant Boolean := False;
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Stack_Check_Probes : constant Boolean := False;
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Stack_Check_Limits : constant Boolean := False;
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Support_Aggregates : constant Boolean := True;
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Support_Composite_Assign : constant Boolean := True;
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Support_Composite_Compare : constant Boolean := True;
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Support_Long_Shifts : constant Boolean := True;
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Always_Compatible_Rep : constant Boolean := True;
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Suppress_Standard_Library : constant Boolean := False;
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Use_Ada_Main_Program_Name : constant Boolean := False;
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Frontend_Exceptions : constant Boolean := False;
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ZCX_By_Default : constant Boolean := True;
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-- Obsolete entries, to be removed eventually (bootstrap issues)
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Front_End_ZCX_Support : constant Boolean := False;
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High_Integrity_Mode : constant Boolean := False;
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Long_Shifts_Inlined : constant Boolean := True;
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Functions_Return_By_DSP : constant Boolean := False;
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Support_64_Bit_Divides : constant Boolean := True;
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GCC_ZCX_Support : constant Boolean := True;
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end System;
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