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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) 2000-2018, 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 unit
  27 --  is an internal unit intended only for use by the implementation and which
  28 --  should not be directly WITH'ed by user code. It also checks for Ada 2005
  29 --  units that should only be WITH'ed in Ada 2005 mode, and Ada 2012 units
  30 --  that should only be WITH'ed in Ada 2012 mode.
  31
  32 with Types; use Types;
  33
  34 package Impunit is
  35
  36    type Kind_Of_Unit is
  37      (Implementation_Unit,
  38       --  Unit from predefined library intended to be used only by the compiler
  39       --  generated code, or from the implementation of the run time. Use of
  40       --  such a unit generates a warning unless the client is compiled with
  41       --  the -gnatg switch. If we are being super strict, this should be an
  42       --  error for the case of Ada units, but that seems over strenuous.
  43
  44       Not_Predefined_Unit,
  45       --  This is not a predefined unit, so no checks are needed
  46
  47       Ada_95_Unit,
  48       --  This unit is defined in the Ada 95 RM, and can be freely with'ed in
  49       --  both Ada 95 mode and Ada 05 mode. Note that in Ada 83 mode, no child
  50       --  units are allowed, so you can't even name such a unit.
  51
  52       Ada_2005_Unit,
  53       --  This unit is defined in the Ada 2005 RM. Withing this unit from an
  54       --  Ada 95 mode program will generate a warning (again, strictly speaking
  55       --  this should be an error, but that seems over-strenuous).
  56
  57       Ada_2012_Unit);
  58       --  This unit is defined in the Ada 2012 RM. Withing this unit from an
  59       --  Ada 95 or 2005 mode program will generate a warning (again, strictly
  60       --  speaking this should be an error, but that seems over-strenuous).
  61
  62    function Get_Kind_Of_Unit (U : Unit_Number_Type) return Kind_Of_Unit;
  63    --  Given the unit number of a unit, this function determines the type
  64    --  of the unit, as defined above. If the result is Implementation_Unit,
  65    --  then the name of a possible alternative equivalent unit is placed in
  66    --  Error_Msg_String/Slen on return. If there is no alternative name, or if
  67    --  the result is not Implementation_Unit, then Error_Msg_Slen is zero on
  68    --  return, indicating that no alternative name was found.
  69
  70    function Get_Kind_Of_File (File : String) return Kind_Of_Unit;
  71    --  Same as Get_Kind_Of_Unit, for a given filename
  72
  73    function Is_Known_Unit (Nam : Node_Id) return Boolean;
  74    --  Nam is the possible name of a child unit, represented as a selected
  75    --  component node. This function determines whether the name matches one of
  76    --  the known library units, and if so, returns True. If the name does not
  77    --  match any known library unit, False is returned.
  78
  79    function Not_Impl_Defined_Unit (U : Unit_Number_Type) return Boolean;
  80    --  This function returns True if U represents a unit that is permitted by
  81    --  the restriction No_Implementation_Units (i.e. a unit in the Ada, System,
  82    --  and Interfaces hierarchies that is defined in the RM, or a user defined
  83    --  unit. It returns False if U represents a unit that is not permitted by
  84    --  this restriction, which includes units in these three hierarchies that
  85    --  are GNAT implementation defined. It also returns False for any units in
  86    --  the GNAT hierarchy, which is not strictly conforming, but so obviously
  87    --  useful that it is a reasonable deviation from the standard.
  88
  89 end Impunit;