gcc/ada/prep.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                                 P R E P                                  --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2002-2019, 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 with GNAT.Dynamic_Tables;
  27
  28 with Namet; use Namet;
  29 with Types; use Types;
  30
  31 package Prep is
  32
  33    -----------------
  34    -- Symbol Data --
  35    -----------------
  36
  37    type Symbol_Data is record
  38       Symbol : Name_Id := No_Name;
  39       --  The symbol in lower case
  40
  41       Original : Name_Id := No_Name;
  42       --  The symbol as originally given in the definition file or on
  43       --  the command line.
  44
  45       On_The_Command_Line : Boolean := False;
  46       --  Set to True if symbol is defined on the command line.
  47       --  Used to prevent replacement of command line symbols by definition
  48       --  file symbols.
  49
  50       Is_A_String : Boolean := False;
  51       --  Indicate if the value of the symbol has been specified as a string
  52       --  or simply as a sequence of characters.
  53
  54       Value : String_Id := No_String;
  55       --  The value of the symbol (string or sequence of characters)
  56
  57    end record;
  58
  59    True_Value : Symbol_Data :=
  60      (Symbol              => No_Name,
  61       Original            => No_Name,
  62       On_The_Command_Line => False,
  63       Is_A_String         => False,
  64       Value               => No_String);
  65
  66    type Symbol_Id is new Nat;
  67    No_Symbol : constant Symbol_Id := 0;
  68
  69    package Symbol_Table is new GNAT.Dynamic_Tables
  70      (Table_Component_Type => Symbol_Data,
  71       Table_Index_Type     => Symbol_Id,
  72       Table_Low_Bound      => 1,
  73       Table_Initial        => 10,
  74       Table_Increment      => 100);
  75    --  The table of all symbols
  76
  77    Mapping : Symbol_Table.Instance;
  78    --  The mapping table of symbols to values used by procedure Parse_Def_File
  79    --  and Preprocess.
  80
  81    function Index_Of (Symbol : Name_Id) return Symbol_Id;
  82    --  Return the index in the Mapping table of Symbol.
  83    --  Return No_Symbol if Symbol in not in the Mapping table.
  84
  85    --  Access to procedure types used by procedure Initialize below:
  86
  87    type Error_Msg_Proc is access procedure
  88      (Msg : String; Flag_Location : Source_Ptr);
  89
  90    type Scan_Proc is access procedure;
  91
  92    type Set_Ignore_Errors_Proc is access procedure (To : Boolean);
  93
  94    type Put_Char_Proc is access procedure (C : Character);
  95
  96    type New_EOL_Proc is access procedure;
  97
  98    procedure Initialize;
  99    --  Initialize the preprocessor's global structures
 100
 101    procedure Setup_Hooks
 102      (Error_Msg         : Error_Msg_Proc;
 103       Scan              : Scan_Proc;
 104       Set_Ignore_Errors : Set_Ignore_Errors_Proc;
 105       Put_Char          : Put_Char_Proc;
 106       New_EOL           : New_EOL_Proc);
 107    --  Set the i/o hooks used by the preprocessor
 108
 109    procedure Parse_Def_File;
 110    --  Parse the definition file. The definition file must have already been
 111    --  loaded and the scanner initialized.
 112
 113    procedure Preprocess (Source_Modified : out Boolean);
 114    --  Preprocess the input file. The input file must have already been loaded
 115    --  and the scanner initialized. Source_Modified is set to True iff the
 116    --  preprocessor modified the source text.
 117
 118    procedure Check_Command_Line_Symbol_Definition
 119      (Definition  : String;
 120       Data        : out Symbol_Data);
 121    --  Check the validity of a command line definition <symbol>=<value>.
 122    --  Return the symbol and its value in Data if the definition is valid,
 123    --  fail if it is not valid.
 124
 125    procedure Change_Reserved_Keyword_To_Symbol
 126      (All_Keywords : Boolean := False);
 127    --  If Token is an Ada reserved word (other than IF, ELSIF, ELSE,
 128    --  END, AND, OR, THEN when All_Keywords is False), change it to
 129    --  Tok_Identifier with the corresponding Token_Name.
 130
 131    procedure List_Symbols (Foreword : String);
 132    --  List the symbols used for preprocessing a file, with their values.
 133    --  If Foreword is not empty, Output Foreword before the list.
 134
 135 end Prep;