185 lines
9.0 KiB
Ada
185 lines
9.0 KiB
Ada
|
------------------------------------------------------------------------------
|
||
|
|
-- --
|
||
|
|
-- GNAT RUN-TIME COMPONENTS --
|
||
|
|
-- --
|
||
|
|
-- S Y S T E M --
|
||
|
|
-- --
|
||
|
|
-- S p e c --
|
||
|
|
-- (Compiler Version) --
|
||
|
|
-- --
|
||
|
|
-- Copyright (C) 1992-2020, 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).
|
||
|
|
|
||
|
|
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).
|
||
|
|
|
||
|
|
AAMP : constant Boolean := False;
|
||
|
|
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;
|
||
|
|
Fractional_Fixed_Ops : constant Boolean := False;
|
||
|
|
Frontend_Layout : constant Boolean := False;
|
||
|
|
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;
|
||
|
|
|
||
|
|
-- Obsolete entries, to be removed eventually (bootstrap issues)
|
||
|
|
|
||
|
|
Front_End_ZCX_Support : constant Boolean := False;
|
||
|
|
High_Integrity_Mode : constant Boolean := False;
|
||
|
|
Long_Shifts_Inlined : constant Boolean := True;
|
||
|
|
Functions_Return_By_DSP : constant Boolean := False;
|
||
|
|
Support_64_Bit_Divides : constant Boolean := True;
|
||
|
|
GCC_ZCX_Support : constant Boolean := True;
|
||
|
|
|
||
|
|
end System;
|