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 --          Copyright (C) 1992-2008, 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 child package of Sinfo contains some routines that permit in place
  27 --  alteration of existing tree nodes by changing the value in the Nkind
  28 --  field. Since Nkind functions logically in a manner similar to a variant
  29 --  record discriminant part, such alterations cannot be permitted in a
  30 --  general manner, but in some specific cases, the fields of related nodes
  31 --  have been deliberately layed out in a manner that permits such alteration.
  32
  33 with Atree; use Atree;
  34
  35 package body Sinfo.CN is
  36
  37    use Atree.Unchecked_Access;
  38    --  This package is one of the few packages which is allowed to make direct
  39    --  references to tree nodes (since it is in the business of providing a
  40    --  higher level of tree access which other clients are expected to use and
  41    --  which implements checks).
  42
  43    ------------------------------------------------------------
  44    -- Change_Character_Literal_To_Defining_Character_Literal --
  45    ------------------------------------------------------------
  46
  47    procedure Change_Character_Literal_To_Defining_Character_Literal
  48      (N : in out Node_Id)
  49    is
  50    begin
  51       Set_Nkind (N, N_Defining_Character_Literal);
  52       N := Extend_Node (N);
  53    end Change_Character_Literal_To_Defining_Character_Literal;
  54
  55    ------------------------------------
  56    -- Change_Conversion_To_Unchecked --
  57    ------------------------------------
  58
  59    procedure Change_Conversion_To_Unchecked (N : Node_Id) is
  60    begin
  61       Set_Do_Overflow_Check (N, False);
  62       Set_Do_Tag_Check (N, False);
  63       Set_Do_Length_Check (N, False);
  64       Set_Nkind (N, N_Unchecked_Type_Conversion);
  65    end Change_Conversion_To_Unchecked;
  66
  67    ----------------------------------------------
  68    -- Change_Identifier_To_Defining_Identifier --
  69    ----------------------------------------------
  70
  71    procedure Change_Identifier_To_Defining_Identifier (N : in out Node_Id) is
  72    begin
  73       Set_Nkind (N, N_Defining_Identifier);
  74       N := Extend_Node (N);
  75    end Change_Identifier_To_Defining_Identifier;
  76
  77    --------------------------------------------------------
  78    -- Change_Operator_Symbol_To_Defining_Operator_Symbol --
  79    --------------------------------------------------------
  80
  81    procedure Change_Operator_Symbol_To_Defining_Operator_Symbol
  82      (N : in out Node_Id)
  83    is
  84    begin
  85       Set_Nkind (N, N_Defining_Operator_Symbol);
  86       Set_Node2 (N, Empty); -- Clear unused Str2 field
  87       N := Extend_Node (N);
  88    end Change_Operator_Symbol_To_Defining_Operator_Symbol;
  89
  90    ----------------------------------------------
  91    -- Change_Operator_Symbol_To_String_Literal --
  92    ----------------------------------------------
  93
  94    procedure Change_Operator_Symbol_To_String_Literal (N : Node_Id) is
  95    begin
  96       Set_Nkind (N, N_String_Literal);
  97       Set_Node1 (N, Empty); -- clear Name1 field
  98    end Change_Operator_Symbol_To_String_Literal;
  99
 100    ------------------------------------------------
 101    -- Change_Selected_Component_To_Expanded_Name --
 102    ------------------------------------------------
 103
 104    procedure Change_Selected_Component_To_Expanded_Name (N : Node_Id) is
 105    begin
 106       Set_Nkind (N, N_Expanded_Name);
 107       Set_Chars (N, Chars (Selector_Name (N)));
 108    end Change_Selected_Component_To_Expanded_Name;
 109
 110 end Sinfo.CN;