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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                           I N T E R F A C E S                            --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2002-2003 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- This specification is derived from the Ada Reference Manual for use with --
  12 -- GNAT. The copyright notice above, and the license provisions that follow --
  13 -- apply solely to the implementation dependent sections of this file.      --
  14 --                                                                          --
  15 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  16 -- terms of the  GNU General Public License as published  by the Free Soft- --
  17 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  18 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  19 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  20 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  21 -- for  more details.  You should have  received  a copy of the GNU General --
  22 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  23 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  24 -- MA 02111-1307, USA.                                                      --
  25 --                                                                          --
  26 -- As a special exception,  if other files  instantiate  generics from this --
  27 -- unit, or you link  this unit with other files  to produce an executable, --
  28 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  29 -- covered  by the  GNU  General  Public  License.  This exception does not --
  30 -- however invalidate  any other reasons why  the executable file  might be --
  31 -- covered by the  GNU Public License.                                      --
  32 --                                                                          --
  33 -- GNAT was originally developed  by the GNAT team at  New York University. --
  34 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  35 --                                                                          --
  36 ------------------------------------------------------------------------------
  37
  38 --  This is the OpenVMS version of this package which adds Float_Representation
  39 --  pragmas to the IEEE floating point types to ensure they remain IEEE in
  40 --  the presence of a configuration pragma Float_Representation (Vax_Float).
  41
  42 --  It assumes integer sizes of 8, 16, 32 and 64 are available, and that IEEE
  43 --  floating-point formats are available.
  44
  45 package Interfaces is
  46 pragma Pure (Interfaces);
  47
  48    type Integer_8  is range -2 **  7 .. 2 **  7 - 1;
  49    for Integer_8'Size use  8;
  50
  51    type Integer_16 is range -2 ** 15 .. 2 ** 15 - 1;
  52    for Integer_16'Size use 16;
  53
  54    type Integer_32 is range -2 ** 31 .. 2 ** 31 - 1;
  55    for Integer_32'Size use 32;
  56
  57    type Integer_64 is range -2 ** 63 .. 2 ** 63 - 1;
  58    for Integer_64'Size use 64;
  59
  60    type Unsigned_8  is mod 2 **  8;
  61    for Unsigned_8'Size use  8;
  62
  63    type Unsigned_16 is mod 2 ** 16;
  64    for Unsigned_16'Size use 16;
  65
  66    type Unsigned_32 is mod 2 ** 32;
  67    for Unsigned_32'Size use 32;
  68
  69    type Unsigned_64 is mod 2 ** 64;
  70    for Unsigned_64'Size use 64;
  71
  72    function Shift_Left
  73      (Value  : Unsigned_8;
  74       Amount : Natural)
  75      return    Unsigned_8;
  76
  77    function Shift_Right
  78      (Value  : Unsigned_8;
  79       Amount : Natural)
  80       return   Unsigned_8;
  81
  82    function Shift_Right_Arithmetic
  83      (Value  : Unsigned_8;
  84       Amount : Natural)
  85       return   Unsigned_8;
  86
  87    function Rotate_Left
  88      (Value  : Unsigned_8;
  89       Amount : Natural)
  90       return   Unsigned_8;
  91
  92    function Rotate_Right
  93      (Value  : Unsigned_8;
  94       Amount : Natural)
  95       return   Unsigned_8;
  96
  97    function Shift_Left
  98      (Value  : Unsigned_16;
  99       Amount : Natural)
 100      return    Unsigned_16;
 101
 102    function Shift_Right
 103      (Value  : Unsigned_16;
 104       Amount : Natural)
 105       return   Unsigned_16;
 106
 107    function Shift_Right_Arithmetic
 108      (Value  : Unsigned_16;
 109       Amount : Natural)
 110       return   Unsigned_16;
 111
 112    function Rotate_Left
 113      (Value  : Unsigned_16;
 114       Amount : Natural)
 115       return   Unsigned_16;
 116
 117    function Rotate_Right
 118      (Value  : Unsigned_16;
 119       Amount : Natural)
 120       return   Unsigned_16;
 121
 122    function Shift_Left
 123      (Value  : Unsigned_32;
 124       Amount : Natural)
 125      return    Unsigned_32;
 126
 127    function Shift_Right
 128      (Value  : Unsigned_32;
 129       Amount : Natural)
 130       return   Unsigned_32;
 131
 132    function Shift_Right_Arithmetic
 133      (Value  : Unsigned_32;
 134       Amount : Natural)
 135       return   Unsigned_32;
 136
 137    function Rotate_Left
 138      (Value  : Unsigned_32;
 139       Amount : Natural)
 140       return   Unsigned_32;
 141
 142    function Rotate_Right
 143      (Value  : Unsigned_32;
 144       Amount : Natural)
 145       return   Unsigned_32;
 146
 147    function Shift_Left
 148      (Value  : Unsigned_64;
 149       Amount : Natural)
 150      return    Unsigned_64;
 151
 152    function Shift_Right
 153      (Value  : Unsigned_64;
 154       Amount : Natural)
 155       return   Unsigned_64;
 156
 157    function Shift_Right_Arithmetic
 158      (Value  : Unsigned_64;
 159       Amount : Natural)
 160       return   Unsigned_64;
 161
 162    function Rotate_Left
 163      (Value  : Unsigned_64;
 164       Amount : Natural)
 165       return   Unsigned_64;
 166
 167    function Rotate_Right
 168      (Value  : Unsigned_64;
 169       Amount : Natural)
 170       return   Unsigned_64;
 171
 172    pragma Import (Intrinsic, Shift_Left);
 173    pragma Import (Intrinsic, Shift_Right);
 174    pragma Import (Intrinsic, Shift_Right_Arithmetic);
 175    pragma Import (Intrinsic, Rotate_Left);
 176    pragma Import (Intrinsic, Rotate_Right);
 177
 178    --  Floating point types. We use the digits value to define the IEEE
 179    --  forms, otherwise a configuration pragma specifying VAX float can
 180    --  default the digits to an illegal value for IEEE.
 181    --  Note: it is harmless, and explicitly permitted, to include additional
 182    --  types in interfaces, so it is not wrong to have IEEE_Extended_Float
 183    --  defined even if the extended format is not available.
 184
 185    type IEEE_Float_32       is digits 6;
 186    pragma Float_Representation (IEEE_Float, IEEE_Float_32);
 187
 188    type IEEE_Float_64       is digits 15;
 189    pragma Float_Representation (IEEE_Float, IEEE_Float_64);
 190
 191    type IEEE_Extended_Float is digits 15;
 192    pragma Float_Representation (IEEE_Float, IEEE_Extended_Float);
 193
 194 end Interfaces;