gcc/ada/sinfo-cn.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             S I N F O . C N                              --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --          Copyright (C) 1992-2001 Free Software Foundation, Inc.          --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- GNAT was originally developed  by the GNAT team at  New York University. --
  24 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  25 --                                                                          --
  26 ------------------------------------------------------------------------------
  27
  28 --  This child package of Sinfo contains some routines that permit in place
  29 --  alteration of existing tree nodes by changing the value in the Nkind
  30 --  field. Since Nkind functions logically in a manner similart to a variant
  31 --  record discriminant part, such alterations cannot be permitted in a
  32 --  general manner, but in some specific cases, the fields of related nodes
  33 --  have been deliberately layed out in a manner that permits such alteration.
  34 --  that determin
  35
  36 with Atree; use Atree;
  37
  38 package body Sinfo.CN is
  39
  40    use Atree.Unchecked_Access;
  41    --  This package is one of the few packages which is allowed to make direct
  42    --  references to tree nodes (since it is in the business of providing a
  43    --  higher level of tree access which other clients are expected to use and
  44    --  which implements checks).
  45
  46    ------------------------------------------------------------
  47    -- Change_Character_Literal_To_Defining_Character_Literal --
  48    ------------------------------------------------------------
  49
  50    procedure Change_Character_Literal_To_Defining_Character_Literal
  51      (N : in out Node_Id)
  52    is
  53    begin
  54       Set_Nkind (N, N_Defining_Character_Literal);
  55       N := Extend_Node (N);
  56    end Change_Character_Literal_To_Defining_Character_Literal;
  57
  58    ------------------------------------
  59    -- Change_Conversion_To_Unchecked --
  60    ------------------------------------
  61
  62    procedure Change_Conversion_To_Unchecked (N : Node_Id) is
  63    begin
  64       Set_Do_Overflow_Check (N, False);
  65       Set_Do_Tag_Check (N, False);
  66       Set_Do_Length_Check (N, False);
  67       Set_Nkind (N, N_Unchecked_Type_Conversion);
  68    end Change_Conversion_To_Unchecked;
  69
  70    ----------------------------------------------
  71    -- Change_Identifier_To_Defining_Identifier --
  72    ----------------------------------------------
  73
  74    procedure Change_Identifier_To_Defining_Identifier (N : in out Node_Id) is
  75    begin
  76       Set_Nkind (N, N_Defining_Identifier);
  77       N := Extend_Node (N);
  78    end Change_Identifier_To_Defining_Identifier;
  79
  80    --------------------------------------------------------
  81    -- Change_Operator_Symbol_To_Defining_Operator_Symbol --
  82    --------------------------------------------------------
  83
  84    procedure Change_Operator_Symbol_To_Defining_Operator_Symbol
  85      (N : in out Node_Id)
  86    is
  87    begin
  88       Set_Nkind (N, N_Defining_Operator_Symbol);
  89       Set_Node2 (N, Empty); -- Clear unused Str2 field
  90       N := Extend_Node (N);
  91    end Change_Operator_Symbol_To_Defining_Operator_Symbol;
  92
  93    ----------------------------------------------
  94    -- Change_Operator_Symbol_To_String_Literal --
  95    ----------------------------------------------
  96
  97    procedure Change_Operator_Symbol_To_String_Literal (N : Node_Id) is
  98    begin
  99       Set_Nkind (N, N_String_Literal);
 100       Set_Node1 (N, Empty); -- clear Name1 field
 101    end Change_Operator_Symbol_To_String_Literal;
 102
 103    ------------------------------------------------
 104    -- Change_Selected_Component_To_Expanded_Name --
 105    ------------------------------------------------
 106
 107    procedure Change_Selected_Component_To_Expanded_Name (N : Node_Id) is
 108    begin
 109       Set_Nkind (N, N_Expanded_Name);
 110       Set_Chars (N, Chars (Selector_Name (N)));
 111    end Change_Selected_Component_To_Expanded_Name;
 112
 113 end Sinfo.CN;