118 lines
5.7 KiB
Ada
118 lines
5.7 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S Y S T E M . S T O R A G E _ E L E M E N T S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2002-2013, 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 implementation dependent sections of this file. --
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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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-- Warning: declarations in this package are ambiguous with respect to the
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-- extra declarations that can be introduced into System using Extend_System.
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-- It is a good idea to avoid use clauses for this package.
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pragma Compiler_Unit_Warning;
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package System.Storage_Elements 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 2005,
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-- this is Pure in any case (AI-362).
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-- We also add the pragma Pure_Function to the operations in this package,
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-- because otherwise functions with parameters derived from Address are
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-- treated as non-pure by the back-end (see exp_ch6.adb). This is because
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-- in many cases such a parameter is used to hide read/out access to
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-- objects, and it would be unsafe to treat such functions as pure.
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type Storage_Offset is range
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-(2 ** (Integer'(Standard'Address_Size) - 1)) ..
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+(2 ** (Integer'(Standard'Address_Size) - 1)) - Long_Long_Integer'(1);
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-- Note: the reason for the Long_Long_Integer qualification here is to
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-- avoid a bogus ambiguity when this unit is analyzed in an rtsfind
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-- context. It may be possible to remove this in the future, but it is
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-- certainly harmless in any case ???
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subtype Storage_Count is Storage_Offset range 0 .. Storage_Offset'Last;
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type Storage_Element is mod 2 ** Storage_Unit;
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for Storage_Element'Size use Storage_Unit;
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pragma Universal_Aliasing (Storage_Element);
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-- This type is used by the expander to implement aggregate copy
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type Storage_Array is
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array (Storage_Offset range <>) of aliased Storage_Element;
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for Storage_Array'Component_Size use Storage_Unit;
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-- Address arithmetic
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function "+" (Left : Address; Right : Storage_Offset) return Address;
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pragma Convention (Intrinsic, "+");
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pragma Inline_Always ("+");
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pragma Pure_Function ("+");
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function "+" (Left : Storage_Offset; Right : Address) return Address;
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pragma Convention (Intrinsic, "+");
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pragma Inline_Always ("+");
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pragma Pure_Function ("+");
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function "-" (Left : Address; Right : Storage_Offset) return Address;
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pragma Convention (Intrinsic, "-");
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pragma Inline_Always ("-");
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pragma Pure_Function ("-");
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function "-" (Left, Right : Address) return Storage_Offset;
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pragma Convention (Intrinsic, "-");
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pragma Inline_Always ("-");
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pragma Pure_Function ("-");
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function "mod"
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(Left : Address;
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Right : Storage_Offset) return Storage_Offset;
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pragma Convention (Intrinsic, "mod");
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pragma Inline_Always ("mod");
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pragma Pure_Function ("mod");
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-- Conversion to/from integers
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type Integer_Address is mod Memory_Size;
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function To_Address (Value : Integer_Address) return Address;
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pragma Convention (Intrinsic, To_Address);
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pragma Inline_Always (To_Address);
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pragma Pure_Function (To_Address);
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function To_Integer (Value : Address) return Integer_Address;
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pragma Convention (Intrinsic, To_Integer);
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pragma Inline_Always (To_Integer);
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pragma Pure_Function (To_Integer);
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end System.Storage_Elements;
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