201 lines
9.4 KiB
Ada
201 lines
9.4 KiB
Ada
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------------------------------------------------------------------------------
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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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-- (Windows Version) --
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-- --
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-- Copyright (C) 1992-2015, 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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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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pragma Preelaborable_Initialization (Address);
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Null_Address : constant Address;
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Storage_Unit : constant := 8;
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Word_Size : constant := 32;
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Memory_Size : constant := 2 ** 32;
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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 := Low_Order_First;
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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
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-- by the compiler. They are in the private part of System, where they
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-- can be accessed using the special circuitry in the Targparm unit
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-- whose source should be consulted for more detailed descriptions
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-- of the individual switch values.
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Backend_Divide_Checks : constant Boolean := False;
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Backend_Overflow_Checks : constant Boolean := True;
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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 := True;
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Stack_Check_Limits : constant Boolean := False;
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Support_Aggregates : constant Boolean := True;
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Support_Atomic_Primitives : 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 := False;
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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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---------------------------
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-- Underlying Priorities --
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---------------------------
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-- Important note: this section of the file must come AFTER the
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-- definition of the system implementation parameters to ensure
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-- that the value of these parameters is available for analysis
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-- of the declarations here (using Rtsfind at compile time).
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-- The underlying priorities table provides a generalized mechanism
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-- for mapping from Ada priorities to system priorities. In some
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-- cases a 1-1 mapping is not the convenient or optimal choice.
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type Priorities_Mapping is array (Any_Priority) of Integer;
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pragma Suppress_Initialization (Priorities_Mapping);
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-- Suppress initialization in case gnat.adc specifies Normalize_Scalars
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Underlying_Priorities : constant Priorities_Mapping :=
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(Priority'First ..
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Default_Priority - 8 => -15,
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Default_Priority - 7 => -7,
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Default_Priority - 6 => -6,
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Default_Priority - 5 => -5,
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Default_Priority - 4 => -4,
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Default_Priority - 3 => -3,
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Default_Priority - 2 => -2,
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Default_Priority - 1 => -1,
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Default_Priority => 0,
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Default_Priority + 1 => 1,
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Default_Priority + 2 => 2,
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Default_Priority + 3 => 3,
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Default_Priority + 4 => 4,
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Default_Priority + 5 => 5,
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Default_Priority + 6 ..
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Priority'Last => 6,
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Interrupt_Priority => 15);
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-- The default mapping preserves the standard 31 priorities of the Ada
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-- model, but maps them using compression onto the 7 priority levels
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-- available in NT and on the 16 priority levels available in 2000/XP.
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-- To replace the default values of the Underlying_Priorities mapping,
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-- copy this source file into your build directory, edit the file to
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-- reflect your desired behavior, and recompile using Makefile.adalib
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-- which can be found under the adalib directory of your gnat installation
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pragma Linker_Options ("-Wl,--stack=0x2000000");
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-- This is used to change the default stack (32 MB) size for non tasking
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-- programs. We change this value for GNAT on Windows here because the
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-- binutils on this platform have switched to a too low value for Ada
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-- programs. Note that we also set the stack size for tasking programs in
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-- System.Task_Primitives.Operations.
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end System;
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