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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             S I N F O . C N                              --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2001, 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 2,  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 COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- GNAT was originally developed  by the GNAT team at  New York University. --
  23 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  24 --                                                                          --
  25 ------------------------------------------------------------------------------
  26
  27 --  This child package of Sinfo contains some routines that permit in place
  28 --  alteration of existing tree nodes by changing the value in the Nkind
  29 --  field. Since Nkind functions logically in a manner similar to a variant
  30 --  record discriminant part, such alterations cannot be permitted in a
  31 --  general manner, but in some specific cases, the fields of related nodes
  32 --  have been deliberately laid out in a manner that permits such alteration.
  33
  34 package Sinfo.CN is
  35
  36    procedure Change_Identifier_To_Defining_Identifier (N : in out Node_Id);
  37    --  N must refer to a node of type N_Identifier. This node is modified to
  38    --  be of type N_Defining_Identifier. The scanner always returns identifiers
  39    --  as N_Identifier. The parser then uses this routine to change the node
  40    --  to be a defining identifier where the context demands it. This routine
  41    --  also allocates the necessary extension node. Note that this procedure
  42    --  may (but is not required to) change the Id of the node in question.
  43
  44    procedure Change_Character_Literal_To_Defining_Character_Literal
  45      (N : in out Node_Id);
  46    --  Similar processing for a character literal
  47
  48    procedure Change_Operator_Symbol_To_Defining_Operator_Symbol
  49      (N : in out Node_Id);
  50    --  Similar processing for an operator symbol
  51
  52    procedure Change_Conversion_To_Unchecked (N : Node_Id);
  53    --  Change checked conversion node to unchecked conversion node, clearing
  54    --  irrelevant check flags (other fields in the two nodes are identical)
  55
  56    procedure Change_Operator_Symbol_To_String_Literal (N : Node_Id);
  57    --  The scanner returns any string that looks like an operator symbol as
  58    --  a N_Operator_Symbol node. The parser then uses this procedure to change
  59    --  the node to a normal N_String_Literal node if the context is not one
  60    --  in which an operator symbol is required. There are some cases where the
  61    --  parser cannot tell, in which case this transformation happens later on.
  62
  63    procedure Change_Selected_Component_To_Expanded_Name (N : Node_Id);
  64    --  The parser always generates Selected_Component nodes. The semantics
  65    --  modifies these to Expanded_Name nodes where appropriate. Note that
  66    --  on return the Chars field is set to a copy of the contents of the
  67    --  Chars field of the Selector_Name field.
  68
  69 end Sinfo.CN;