New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45957 138bc75d-0d04-0410-961f-82ee72b054a4

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         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                                  --
+--                                                                          --
+--                            $Revision: 1.23 $                             --
+--                                                                          --
+-- This specification is adapted from the Ada Reference Manual for use with --
+-- GNAT.  In accordance with the copyright of that document, you can freely --
+-- copy and modify this specification,  provided that if you redistribute a --
+-- modified version,  any changes that you have made are clearly indicated. --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  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!
+
+pragma Warnings (Off);
+--  This is to stop bootstrap problems with the use of Inline_Always
+--  To be removed (along with redundant Inline pragmas) in 3.13.
+
+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).
+
+   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 ("+");
+   pragma Inline_Always ("+");
+
+   function "+" (Left : Storage_Offset; Right : Address) return Address;
+   pragma Convention (Intrinsic, "+");
+   pragma Inline ("+");
+   pragma Inline_Always ("+");
+
+   function "-" (Left : Address; Right : Storage_Offset) return Address;
+   pragma Convention (Intrinsic, "-");
+   pragma Inline ("-");
+   pragma Inline_Always ("-");
+
+   function "-" (Left, Right : Address) return Storage_Offset;
+   pragma Convention (Intrinsic, "-");
+   pragma Inline ("-");
+   pragma Inline_Always ("-");
+
+   function "mod"
+     (Left  : Address;
+      Right : Storage_Offset)
+      return  Storage_Offset;
+   pragma Convention (Intrinsic, "mod");
+   pragma Inline ("mod");
+   pragma Inline_Always ("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 (To_Address);
+   pragma Inline_Always (To_Address);
+
+   function To_Integer (Value : Address) return Integer_Address;
+   pragma Convention (Intrinsic, To_Integer);
+   pragma Inline (To_Integer);
+   pragma Inline_Always (To_Integer);
+
+end System.Storage_Elements;