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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              I M P U N I T                               --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2000-2010, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
  19 -- http://www.gnu.org/licenses for a complete copy of the license.          --
  20 --                                                                          --
  21 -- GNAT was originally developed  by the GNAT team at  New York University. --
  22 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  23 --                                                                          --
  24 ------------------------------------------------------------------------------
  25
  26 --  This package contains data and functions used to determine if a given
  27 --  unit is an internal unit intended only for use by the implementation
  28 --  and which should not be directly WITH'ed by user code. It also checks
  29 --  for Ada 05 units that should only be WITH'ed in Ada 05 mode.
  30
  31 with Types; use Types;
  32
  33 package Impunit is
  34
  35    type Kind_Of_Unit is
  36      (Implementation_Unit,
  37       --  Unit from predefined library intended to be used only by the
  38       --  compiler generated code, or from the implementation of the run time.
  39       --  Use of such a unit generates a warning unless the client is compiled
  40       --  with the -gnatg switch. If we are being super strict, this should be
  41       --  an error for the case of Ada units, but that seems over strenuous.
  42
  43       Not_Predefined_Unit,
  44       --  This is not a predefined unit, so no checks are needed
  45
  46       Ada_95_Unit,
  47       --  This unit is defined in the Ada 95 RM, and can be freely with'ed
  48       --  in both Ada 95 mode and Ada 05 mode. Note that in Ada 83 mode, no
  49       --  child units are allowed, so you can't even name such a unit.
  50
  51       Ada_2005_Unit,
  52       --  This unit is defined in the Ada 2005 RM. Withing this unit from a
  53       --  Ada 95 mode program will generate a warning (again, strictly speaking
  54       --  this should be an error, but that seems over-strenuous).
  55
  56       Ada_2012_Unit);
  57       --  This unit is defined in the Ada 2012 RM. Withing this unit from a Ada
  58       --  95 mode or Ada 2005 program will generate a warning (again, strictly
  59       --  speaking this should be an error, but that seems over-strenuous).
  60
  61    function Get_Kind_Of_Unit (U : Unit_Number_Type) return Kind_Of_Unit;
  62    --  Given the unit number of a unit, this function determines the type
  63    --  of the unit, as defined above. If the result is Implementation_Unit,
  64    --  then the name of a possible atlernative equivalent unit is placed in
  65    --  Error_Msg_String/Slen on return. If there is no alternative name, or
  66    --  if the result is not Implementation_Unit, then Error_Msg_Slen is zero
  67    --  on return, indicating that no alternative name was found.
  68
  69    function Is_Known_Unit (Nam : Node_Id) return Boolean;
  70    --  Nam is the possible name of a child unit, represented as a selected
  71    --  component node. This function determines whether the name matches
  72    --  one of the known library units, and if so, returns True. If the name
  73    --  does not match any known library unit, False is returned.
  74
  75 end Impunit;