gcc/ada/s-stoele.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --               S Y S T E M . S T O R A G E _ E L E M E N T S              --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.23 $                             --
  10 --                                                                          --
  11 -- This specification is adapted from the Ada Reference Manual for use with --
  12 -- GNAT.  In accordance with the copyright of that document, you can freely --
  13 -- copy and modify this specification,  provided that if you redistribute a --
  14 -- modified version,  any changes that you have made are clearly indicated. --
  15 --                                                                          --
  16 ------------------------------------------------------------------------------
  17
  18 --  Warning: declarations in this package are ambiguous with respect to the
  19 --  extra declarations that can be introduced into System using Extend_System.
  20 --  It is a good idea to avoid use clauses for this package!
  21
  22 pragma Warnings (Off);
  23 --  This is to stop bootstrap problems with the use of Inline_Always
  24 --  To be removed (along with redundant Inline pragmas) in 3.13.
  25
  26 package System.Storage_Elements is
  27 pragma Pure (Storage_Elements);
  28 --  Note that we take advantage of the implementation permission to make
  29 --  this unit Pure instead of Preelaborable; see RM 13.7.1(15).
  30
  31    type Storage_Offset is range
  32      -(2 ** (Standard."-" (Standard'Address_Size, 1))) ..
  33      +(2 ** (Standard."-" (Standard'Address_Size, 1))) - 1;
  34    --  Note: the reason for the qualification of "-" here by Standard is
  35    --  that we have a current bug in GNAT that otherwise causes a bogus
  36    --  ambiguity when this unit is analyzed in an Rtsfind context.
  37
  38    subtype Storage_Count is Storage_Offset range 0 .. Storage_Offset'Last;
  39
  40    type Storage_Element is mod 2 ** Storage_Unit;
  41    for Storage_Element'Size use Storage_Unit;
  42
  43    type Storage_Array is
  44      array (Storage_Offset range <>) of aliased Storage_Element;
  45    for Storage_Array'Component_Size use Storage_Unit;
  46
  47    --  Address arithmetic
  48
  49    function "+" (Left : Address; Right : Storage_Offset) return Address;
  50    pragma Convention (Intrinsic, "+");
  51    pragma Inline ("+");
  52    pragma Inline_Always ("+");
  53
  54    function "+" (Left : Storage_Offset; Right : Address) return Address;
  55    pragma Convention (Intrinsic, "+");
  56    pragma Inline ("+");
  57    pragma Inline_Always ("+");
  58
  59    function "-" (Left : Address; Right : Storage_Offset) return Address;
  60    pragma Convention (Intrinsic, "-");
  61    pragma Inline ("-");
  62    pragma Inline_Always ("-");
  63
  64    function "-" (Left, Right : Address) return Storage_Offset;
  65    pragma Convention (Intrinsic, "-");
  66    pragma Inline ("-");
  67    pragma Inline_Always ("-");
  68
  69    function "mod"
  70      (Left  : Address;
  71       Right : Storage_Offset)
  72       return  Storage_Offset;
  73    pragma Convention (Intrinsic, "mod");
  74    pragma Inline ("mod");
  75    pragma Inline_Always ("mod");
  76
  77    --  Conversion to/from integers
  78
  79    type Integer_Address is mod Memory_Size;
  80
  81    function To_Address (Value : Integer_Address) return Address;
  82    pragma Convention (Intrinsic, To_Address);
  83    pragma Inline (To_Address);
  84    pragma Inline_Always (To_Address);
  85
  86    function To_Integer (Value : Address) return Integer_Address;
  87    pragma Convention (Intrinsic, To_Integer);
  88    pragma Inline (To_Integer);
  89    pragma Inline_Always (To_Integer);
  90
  91 end System.Storage_Elements;