| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S Y S T E M . S T O R A G E _ E L E M E N T S -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 2002-2003 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 implementation dependent sections of this file. -- |
| -- -- |
| -- 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 2, 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. See the GNU General Public License -- |
| -- for more details. You should have received a copy of the GNU General -- |
| -- Public License distributed with GNAT; see file COPYING. If not, write -- |
| -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- |
| -- MA 02111-1307, USA. -- |
| -- -- |
| -- As a special exception, if other files instantiate generics from this -- |
| -- unit, or you link this unit with other files to produce an executable, -- |
| -- this unit does not by itself cause the resulting executable to be -- |
| -- covered by the GNU General Public License. This exception does not -- |
| -- however invalidate any other reasons why the executable file might be -- |
| -- covered by the GNU Public License. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- Warning: declarations in this package are ambiguous with respect to the |
| -- extra declarations that can be introduced into System using Extend_System. |
| -- It is a good idea to avoid use clauses for this package! |
| |
| package System.Storage_Elements is |
| pragma Pure (Storage_Elements); |
| -- Note that we take advantage of the implementation permission to make |
| -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). |
| |
| -- We also add the pragma Pure_Function to the operations in this package, |
| -- because otherwise functions with parameters derived from Address are |
| -- treated as non-pure by the back-end (see exp_ch6.adb). This is because |
| -- in many cases such a parameter is used to hide read/out access to objects, |
| -- and it would be unsafe to treat such functions as pure. |
| |
| type Storage_Offset is range |
| -(2 ** (Standard."-" (Standard'Address_Size, 1))) .. |
| +(2 ** (Standard."-" (Standard'Address_Size, 1))) - 1; |
| |
| -- Note: the reason for the qualification of "-" here by Standard is |
| -- that we have a current bug in GNAT that otherwise causes a bogus |
| -- ambiguity when this unit is analyzed in an Rtsfind context. |
| |
| subtype Storage_Count is Storage_Offset range 0 .. Storage_Offset'Last; |
| |
| type Storage_Element is mod 2 ** Storage_Unit; |
| for Storage_Element'Size use Storage_Unit; |
| |
| type Storage_Array is |
| array (Storage_Offset range <>) of aliased Storage_Element; |
| for Storage_Array'Component_Size use Storage_Unit; |
| |
| -- Address arithmetic |
| |
| function "+" (Left : Address; Right : Storage_Offset) return Address; |
| pragma Convention (Intrinsic, "+"); |
| pragma Inline_Always ("+"); |
| pragma Pure_Function ("+"); |
| |
| function "+" (Left : Storage_Offset; Right : Address) return Address; |
| pragma Convention (Intrinsic, "+"); |
| pragma Inline_Always ("+"); |
| pragma Pure_Function ("+"); |
| |
| function "-" (Left : Address; Right : Storage_Offset) return Address; |
| pragma Convention (Intrinsic, "-"); |
| pragma Inline_Always ("-"); |
| pragma Pure_Function ("+"); |
| |
| function "-" (Left, Right : Address) return Storage_Offset; |
| pragma Convention (Intrinsic, "-"); |
| pragma Inline_Always ("-"); |
| pragma Pure_Function ("-"); |
| |
| function "mod" |
| (Left : Address; |
| Right : Storage_Offset) |
| return Storage_Offset; |
| pragma Convention (Intrinsic, "mod"); |
| pragma Inline_Always ("mod"); |
| pragma Pure_Function ("mod"); |
| |
| -- Conversion to/from integers |
| |
| type Integer_Address is mod Memory_Size; |
| |
| function To_Address (Value : Integer_Address) return Address; |
| pragma Convention (Intrinsic, To_Address); |
| pragma Inline_Always (To_Address); |
| pragma Pure_Function (To_Address); |
| |
| function To_Integer (Value : Address) return Integer_Address; |
| pragma Convention (Intrinsic, To_Integer); |
| pragma Inline_Always (To_Integer); |
| pragma Pure_Function (To_Integer); |
| |
| end System.Storage_Elements; |
