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 --                                                                          --
  10 -- This specification is adapted from the Ada Reference Manual for use with --
  11 -- GNAT.  In accordance with the copyright of that document, you can freely --
  12 -- copy and modify this specification,  provided that if you redistribute a --
  13 -- modified version,  any changes that you have made are clearly indicated. --
  14 --                                                                          --
  15 ------------------------------------------------------------------------------
  16
  17 --  Warning: declarations in this package are ambiguous with respect to the
  18 --  extra declarations that can be introduced into System using Extend_System.
  19 --  It is a good idea to avoid use clauses for this package!
  20
  21 pragma Warnings (Off);
  22 --  This is to stop bootstrap problems with the use of Inline_Always
  23 --  To be removed (along with redundant Inline pragmas) in 3.13.
  24
  25 package System.Storage_Elements is
  26 pragma Pure (Storage_Elements);
  27 --  Note that we take advantage of the implementation permission to make
  28 --  this unit Pure instead of Preelaborable; see RM 13.7.1(15).
  29
  30    type Storage_Offset is range
  31      -(2 ** (Standard."-" (Standard'Address_Size, 1))) ..
  32      +(2 ** (Standard."-" (Standard'Address_Size, 1))) - 1;
  33    --  Note: the reason for the qualification of "-" here by Standard is
  34    --  that we have a current bug in GNAT that otherwise causes a bogus
  35    --  ambiguity when this unit is analyzed in an Rtsfind context.
  36
  37    subtype Storage_Count is Storage_Offset range 0 .. Storage_Offset'Last;
  38
  39    type Storage_Element is mod 2 ** Storage_Unit;
  40    for Storage_Element'Size use Storage_Unit;
  41
  42    type Storage_Array is
  43      array (Storage_Offset range <>) of aliased Storage_Element;
  44    for Storage_Array'Component_Size use Storage_Unit;
  45
  46    --  Address arithmetic
  47
  48    function "+" (Left : Address; Right : Storage_Offset) return Address;
  49    pragma Convention (Intrinsic, "+");
  50    pragma Inline ("+");
  51    pragma Inline_Always ("+");
  52
  53    function "+" (Left : Storage_Offset; Right : Address) return Address;
  54    pragma Convention (Intrinsic, "+");
  55    pragma Inline ("+");
  56    pragma Inline_Always ("+");
  57
  58    function "-" (Left : Address; Right : Storage_Offset) return Address;
  59    pragma Convention (Intrinsic, "-");
  60    pragma Inline ("-");
  61    pragma Inline_Always ("-");
  62
  63    function "-" (Left, Right : Address) return Storage_Offset;
  64    pragma Convention (Intrinsic, "-");
  65    pragma Inline ("-");
  66    pragma Inline_Always ("-");
  67
  68    function "mod"
  69      (Left  : Address;
  70       Right : Storage_Offset)
  71       return  Storage_Offset;
  72    pragma Convention (Intrinsic, "mod");
  73    pragma Inline ("mod");
  74    pragma Inline_Always ("mod");
  75
  76    --  Conversion to/from integers
  77
  78    type Integer_Address is mod Memory_Size;
  79
  80    function To_Address (Value : Integer_Address) return Address;
  81    pragma Convention (Intrinsic, To_Address);
  82    pragma Inline (To_Address);
  83    pragma Inline_Always (To_Address);
  84
  85    function To_Integer (Value : Address) return Integer_Address;
  86    pragma Convention (Intrinsic, To_Integer);
  87    pragma Inline (To_Integer);
  88    pragma Inline_Always (To_Integer);
  89
  90 end System.Storage_Elements;