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) 1992-2001 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 similart 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 layed out in a manner that permits such alteration.
  33 --  that determin
  34
  35 with Atree; use Atree;
  36
  37 package body Sinfo.CN is
  38
  39    use Atree.Unchecked_Access;
  40    --  This package is one of the few packages which is allowed to make direct
  41    --  references to tree nodes (since it is in the business of providing a
  42    --  higher level of tree access which other clients are expected to use and
  43    --  which implements checks).
  44
  45    ------------------------------------------------------------
  46    -- Change_Character_Literal_To_Defining_Character_Literal --
  47    ------------------------------------------------------------
  48
  49    procedure Change_Character_Literal_To_Defining_Character_Literal
  50      (N : in out Node_Id)
  51    is
  52    begin
  53       Set_Nkind (N, N_Defining_Character_Literal);
  54       N := Extend_Node (N);
  55    end Change_Character_Literal_To_Defining_Character_Literal;
  56
  57    ------------------------------------
  58    -- Change_Conversion_To_Unchecked --
  59    ------------------------------------
  60
  61    procedure Change_Conversion_To_Unchecked (N : Node_Id) is
  62    begin
  63       Set_Do_Overflow_Check (N, False);
  64       Set_Do_Tag_Check (N, False);
  65       Set_Do_Length_Check (N, False);
  66       Set_Nkind (N, N_Unchecked_Type_Conversion);
  67    end Change_Conversion_To_Unchecked;
  68
  69    ----------------------------------------------
  70    -- Change_Identifier_To_Defining_Identifier --
  71    ----------------------------------------------
  72
  73    procedure Change_Identifier_To_Defining_Identifier (N : in out Node_Id) is
  74    begin
  75       Set_Nkind (N, N_Defining_Identifier);
  76       N := Extend_Node (N);
  77    end Change_Identifier_To_Defining_Identifier;
  78
  79    --------------------------------------------------------
  80    -- Change_Operator_Symbol_To_Defining_Operator_Symbol --
  81    --------------------------------------------------------
  82
  83    procedure Change_Operator_Symbol_To_Defining_Operator_Symbol
  84      (N : in out Node_Id)
  85    is
  86    begin
  87       Set_Nkind (N, N_Defining_Operator_Symbol);
  88       Set_Node2 (N, Empty); -- Clear unused Str2 field
  89       N := Extend_Node (N);
  90    end Change_Operator_Symbol_To_Defining_Operator_Symbol;
  91
  92    ----------------------------------------------
  93    -- Change_Operator_Symbol_To_String_Literal --
  94    ----------------------------------------------
  95
  96    procedure Change_Operator_Symbol_To_String_Literal (N : Node_Id) is
  97    begin
  98       Set_Nkind (N, N_String_Literal);
  99       Set_Node1 (N, Empty); -- clear Name1 field
 100    end Change_Operator_Symbol_To_String_Literal;
 101
 102    ------------------------------------------------
 103    -- Change_Selected_Component_To_Expanded_Name --
 104    ------------------------------------------------
 105
 106    procedure Change_Selected_Component_To_Expanded_Name (N : Node_Id) is
 107    begin
 108       Set_Nkind (N, N_Expanded_Name);
 109       Set_Chars (N, Chars (Selector_Name (N)));
 110    end Change_Selected_Component_To_Expanded_Name;
 111
 112 end Sinfo.CN;