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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             P R E P C O M P                              --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 2003-2009, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with Ada.Unchecked_Deallocation;

with Errout;   use Errout;

with Lib.Writ; use Lib.Writ;

with Opt;      use Opt;

with Osint;    use Osint;

with Prep;     use Prep;

with Scans;    use Scans;

with Scn;      use Scn;

with Sinput.L; use Sinput.L;

with Stringt;  use Stringt;

with Table;

with Types;    use Types;

package body Prepcomp is

   No_Preprocessing : Boolean := True;

   --  Set to False if there is at least one source that needs to be

   --  preprocessed.

   Source_Index_Of_Preproc_Data_File : Source_File_Index := No_Source_File;

   --  The following variable should be a constant, but this is not possible

   --  because its type GNAT.Dynamic_Tables.Instance has a component P of

   --  unitialized private type GNAT.Dynamic_Tables.Table_Private and there

   --  are no exported values for this private type. Warnings are Off because

   --  it is never assigned a value.

   pragma Warnings (Off);

   No_Mapping : Prep.Symbol_Table.Instance;

   pragma Warnings (On);

   type String_Ptr is access String;

   type String_Array is array (Positive range <>) of String_Ptr;

   type String_Array_Ptr is access String_Array;

   procedure Free is

      new Ada.Unchecked_Deallocation (String_Array, String_Array_Ptr);

   Symbol_Definitions : String_Array_Ptr := new String_Array (1 .. 4);

   --  An extensible array to temporarily stores symbol definitions specified

   --  on the command line with -gnateD switches.

   Last_Definition : Natural := 0;

   --  Index of last symbol definition in array Symbol_Definitions

   type Preproc_Data is record

      Mapping      : Symbol_Table.Instance;

      File_Name    : File_Name_Type := No_File;

      Deffile      : String_Id      := No_String;

      Undef_False  : Boolean        := False;

      Always_Blank : Boolean        := False;

      Comments     : Boolean        := False;

      List_Symbols : Boolean        := False;

      Processed    : Boolean        := False;

   end record;

   --  Structure to keep the preprocessing data for a file name or for the

   --  default (when Name_Id = No_Name).

   No_Preproc_Data : constant Preproc_Data :=

     (Mapping      => No_Mapping,

      File_Name    => No_File,

      Deffile      => No_String,

      Undef_False  => False,

      Always_Blank => False,

      Comments     => False,

      List_Symbols => False,

      Processed    => False);

   Default_Data : Preproc_Data := No_Preproc_Data;

   --  The preprocessing data to be used when no specific preprocessing data

   --  is specified for a source.

   Default_Data_Defined : Boolean := False;

   --  True if source for which no specific preprocessing is specified need to

   --  be preprocess with the Default_Data.

   Current_Data : Preproc_Data := No_Preproc_Data;

   package Preproc_Data_Table is new Table.Table

     (Table_Component_Type => Preproc_Data,

      Table_Index_Type     => Int,

      Table_Low_Bound      => 1,

      Table_Initial        => 5,

      Table_Increment      => 100,

      Table_Name           => "Prepcomp.Preproc_Data_Table");

   --  Table to store the specific preprocessing data

   Command_Line_Symbols : Symbol_Table.Instance;

   --  A table to store symbol definitions specified on the command line with

   --  -gnateD switches.

   package Dependencies is new Table.Table

     (Table_Component_Type => Source_File_Index,

      Table_Index_Type     => Int,

      Table_Low_Bound      => 1,

      Table_Initial        => 10,

      Table_Increment      => 100,

      Table_Name           => "Prepcomp.Dependencies");

   --  Table to store the dependencies on preprocessing files

   procedure Add_Command_Line_Symbols;

   --  Add the command line symbol definitions, if any, to Prep.Mapping table

   procedure Skip_To_End_Of_Line;

   --  Ignore errors and scan up to the next end of line or the end of file

   ------------------------------

   -- Add_Command_Line_Symbols --

   ------------------------------

   procedure Add_Command_Line_Symbols is

      Symbol_Id : Prep.Symbol_Id;

   begin

      for J in 1 .. Symbol_Table.Last (Command_Line_Symbols) loop

         Symbol_Id := Prep.Index_Of (Command_Line_Symbols.Table (J).Symbol);

         if Symbol_Id = No_Symbol then

            Symbol_Table.Increment_Last (Prep.Mapping);

            Symbol_Id := Symbol_Table.Last (Prep.Mapping);

         end if;

         Prep.Mapping.Table (Symbol_Id) := Command_Line_Symbols.Table (J);

      end loop;

   end Add_Command_Line_Symbols;

   ----------------------

   -- Add_Dependencies --

   ----------------------

   procedure Add_Dependencies is

   begin

      for Index in 1 .. Dependencies.Last loop

         Add_Preprocessing_Dependency (Dependencies.Table (Index));

      end loop;

   end Add_Dependencies;

   ---------------------------

   -- Add_Symbol_Definition --

   ---------------------------

   procedure Add_Symbol_Definition (Def : String) is

   begin

      --  If Symbol_Definitions is not large enough, double it

      if Last_Definition = Symbol_Definitions'Last then

         declare

            New_Symbol_Definitions : constant String_Array_Ptr :=

              new String_Array (1 .. 2 * Last_Definition);

         begin

            New_Symbol_Definitions (Symbol_Definitions'Range) :=

              Symbol_Definitions.all;

            Free (Symbol_Definitions);

            Symbol_Definitions := New_Symbol_Definitions;

         end;

      end if;

      Last_Definition := Last_Definition + 1;

      Symbol_Definitions (Last_Definition) := new String'(Def);

   end Add_Symbol_Definition;

   -------------------

   -- Check_Symbols --

   -------------------

   procedure Check_Symbols is

   begin

      --  If there is at least one switch -gnateD specified

      if Symbol_Table.Last (Command_Line_Symbols) >= 1 then

         Current_Data := No_Preproc_Data;

         No_Preprocessing := False;

         Current_Data.Processed := True;

         --  Start with an empty, initialized mapping table; use Prep.Mapping,

         --  because Prep.Index_Of uses Prep.Mapping.

         Prep.Mapping := No_Mapping;

         Symbol_Table.Init (Prep.Mapping);

         --  Add the command line symbols

         Add_Command_Line_Symbols;

         --  Put the resulting Prep.Mapping in Current_Data, and immediately

         --  set Prep.Mapping to nil.

         Current_Data.Mapping := Prep.Mapping;

         Prep.Mapping := No_Mapping;

         --  Set the default data

         Default_Data := Current_Data;

         Default_Data_Defined := True;

      end if;

   end Check_Symbols;

   ------------------------------

   -- Parse_Preprocessing_Data --

   ------------------------------

   procedure Parse_Preprocessing_Data_File (N : File_Name_Type) is

      OK            : Boolean := False;

      Dash_Location : Source_Ptr;

      Symbol_Data   : Prep.Symbol_Data;

      Symbol_Id     : Prep.Symbol_Id;

      T             : constant Nat := Total_Errors_Detected;

   begin

      --  Load the preprocessing data file

      Source_Index_Of_Preproc_Data_File := Load_Preprocessing_Data_File (N);

      --  Fail if preprocessing data file cannot be found

      if Source_Index_Of_Preproc_Data_File = No_Source_File then

         Get_Name_String (N);

         Fail ("preprocessing data file """

               & Name_Buffer (1 .. Name_Len)

               & """ not found");

      end if;

      --  Initialize scanner and set its behavior for processing a data file

      Scn.Scanner.Initialize_Scanner (Source_Index_Of_Preproc_Data_File);

      Scn.Scanner.Set_End_Of_Line_As_Token (True);

      Scn.Scanner.Reset_Special_Characters;

      For_Each_Line : loop

         <<Scan_Line>>

         Scan;

         exit For_Each_Line when Token = Tok_EOF;

         if Token = Tok_End_Of_Line then

            goto Scan_Line;

         end if;

         --  Line is not empty

         OK := False;

         No_Preprocessing := False;

         Current_Data := No_Preproc_Data;

         case Token is

            when Tok_Asterisk =>

               --  Default data

               if Default_Data_Defined then

                  Error_Msg

                    ("multiple default preprocessing data", Token_Ptr);

               else

                  OK := True;

                  Default_Data_Defined := True;

               end if;

            when Tok_String_Literal =>

               --  Specific data

               String_To_Name_Buffer (String_Literal_Id);

               Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));

               Current_Data.File_Name := Name_Find;

               OK := True;

               for Index in 1 .. Preproc_Data_Table.Last loop

                  if Current_Data.File_Name =

                       Preproc_Data_Table.Table (Index).File_Name

                  then

                     Error_Msg_File_1 := Current_Data.File_Name;

                     Error_Msg

                       ("multiple preprocessing data for{", Token_Ptr);

                     OK := False;

                     exit;

                  end if;

               end loop;

            when others =>

               Error_Msg ("`'*` or literal string expected", Token_Ptr);

         end case;

         --  If there is a problem, skip the line

         if not OK then

            Skip_To_End_Of_Line;

            goto Scan_Line;

         end if;

         --  Scan past the * or the literal string

         Scan;

         --  A literal string in second position is a definition file

         if Token = Tok_String_Literal then

            Current_Data.Deffile := String_Literal_Id;

            Current_Data.Processed := False;

            Scan;

         else

            --  If there is no definition file, set Processed to True now

            Current_Data.Processed := True;

         end if;

         --  Start with an empty, initialized mapping table; use Prep.Mapping,

         --  because Prep.Index_Of uses Prep.Mapping.

         Prep.Mapping := No_Mapping;

         Symbol_Table.Init (Prep.Mapping);

         --  Check the switches that may follow

         while Token /= Tok_End_Of_Line and then Token /= Tok_EOF loop

            if Token /= Tok_Minus then

               Error_Msg ("`'-` expected", Token_Ptr);

               Skip_To_End_Of_Line;

               goto Scan_Line;

            end if;

            --  Keep the location of the '-' for possible error reporting

            Dash_Location := Token_Ptr;

            --  Scan past the '-'

            Scan;

            OK := False;

            Change_Reserved_Keyword_To_Symbol;

            --  An identifier (or a reserved word converted to an

            --  identifier) is expected and there must be no blank space

            --  between the '-' and the identifier.

            if Token = Tok_Identifier

              and then Token_Ptr = Dash_Location + 1

            then

               Get_Name_String (Token_Name);

               --  Check the character in the source, because the case is

               --  significant.

               case Sinput.Source (Token_Ptr) is

                  when 'u' =>

                     --  Undefined symbol are False

                     if Name_Len = 1 then

                        Current_Data.Undef_False := True;

                        OK := True;

                     end if;

                  when 'b' =>

                     --  Blank lines

                     if Name_Len = 1 then

                        Current_Data.Always_Blank := True;

                        OK := True;

                     end if;

                  when 'c' =>

                     --  Comment removed lines

                     if Name_Len = 1 then

                        Current_Data.Comments := True;

                        OK := True;

                     end if;

                  when 's' =>

                     --  List symbols

                     if Name_Len = 1 then

                        Current_Data.List_Symbols := True;

                        OK := True;

                     end if;

                  when 'D' =>

                     --  Symbol definition

                     OK := Name_Len > 1;

                     if OK then

                        --  A symbol must be an Ada identifier; it cannot start

                        --  with an underline or a digit.

                        if Name_Buffer (2) = '_'

                          or else Name_Buffer (2) in '0' .. '9'

                        then

                           Error_Msg ("symbol expected", Token_Ptr + 1);

                           Skip_To_End_Of_Line;

                           goto Scan_Line;

                        end if;

                        --  Get the name id of the symbol

                        Symbol_Data.On_The_Command_Line := True;

                        Name_Buffer (1 .. Name_Len - 1) :=

                          Name_Buffer (2 .. Name_Len);

                        Name_Len := Name_Len - 1;

                        Symbol_Data.Symbol := Name_Find;

                        if Name_Buffer (1 .. Name_Len) = "if"

                          or else Name_Buffer (1 .. Name_Len) = "else"

                          or else Name_Buffer (1 .. Name_Len) = "elsif"

                          or else Name_Buffer (1 .. Name_Len) = "end"

                          or else Name_Buffer (1 .. Name_Len) = "not"

                          or else Name_Buffer (1 .. Name_Len) = "and"

                          or else Name_Buffer (1 .. Name_Len) = "then"

                        then

                           Error_Msg ("symbol expected", Token_Ptr + 1);

                           Skip_To_End_Of_Line;

                           goto Scan_Line;

                        end if;

                        --  Get the name id of the original symbol, with

                        --  possibly capital letters.

                        Name_Len := Integer (Scan_Ptr - Token_Ptr - 1);

                        for J in 1 .. Name_Len loop

                           Name_Buffer (J) :=

                             Sinput.Source (Token_Ptr + Text_Ptr (J));

                        end loop;

                        Symbol_Data.Original := Name_Find;

                        --  Scan past D<symbol>

                        Scan;

                        if Token /= Tok_Equal then

                           Error_Msg ("`=` expected", Token_Ptr);

                           Skip_To_End_Of_Line;

                           goto Scan_Line;

                        end if;

                        --  Scan past '='

                        Scan;

                        --  Here any reserved word is OK

                        Change_Reserved_Keyword_To_Symbol

                          (All_Keywords => True);

                        --  Value can be an identifier (or a reserved word)

                        --  or a literal string.

                        case Token is

                           when Tok_String_Literal =>

                              Symbol_Data.Is_A_String := True;

                              Symbol_Data.Value := String_Literal_Id;

                           when Tok_Identifier =>

                              Symbol_Data.Is_A_String := False;

                              Start_String;

                              for J in Token_Ptr .. Scan_Ptr - 1 loop

                                 Store_String_Char (Sinput.Source (J));

                              end loop;

                              Symbol_Data.Value := End_String;

                           when others =>

                              Error_Msg

                                ("literal string or identifier expected",

                                 Token_Ptr);

                              Skip_To_End_Of_Line;

                              goto Scan_Line;

                        end case;

                        --  If symbol already exists, replace old definition

                        --  by new one.

                        Symbol_Id := Prep.Index_Of (Symbol_Data.Symbol);

                        --  Otherwise, add a new entry in the table

                        if Symbol_Id = No_Symbol then

                           Symbol_Table.Increment_Last (Prep.Mapping);

                           Symbol_Id := Symbol_Table.Last (Mapping);

                        end if;

                        Prep.Mapping.Table (Symbol_Id) := Symbol_Data;

                     end if;

                  when others =>

                     null;

               end case;

               Scan;

            end if;

            if not OK then

               Error_Msg ("invalid switch", Dash_Location);

               Skip_To_End_Of_Line;

               goto Scan_Line;

            end if;

         end loop;

         --  Add the command line symbols, if any, possibly replacing symbols

         --  just defined.

         Add_Command_Line_Symbols;

         --  Put the resulting Prep.Mapping in Current_Data, and immediately

         --  set Prep.Mapping to nil.

         Current_Data.Mapping := Prep.Mapping;

         Prep.Mapping := No_Mapping;

         --  Record Current_Data

         if Current_Data.File_Name = No_File then

            Default_Data := Current_Data;

         else

            Preproc_Data_Table.Increment_Last;

            Preproc_Data_Table.Table (Preproc_Data_Table.Last) := Current_Data;

         end if;

         Current_Data := No_Preproc_Data;

      end loop For_Each_Line;

      Scn.Scanner.Set_End_Of_Line_As_Token (False);

      --  Fail if there were errors in the preprocessing data file

      if Total_Errors_Detected > T then

         Errout.Finalize (Last_Call => True);

         Errout.Output_Messages;

         Fail ("errors found in preprocessing data file """

               & Get_Name_String (N) & """");

      end if;

      --  Record the dependency on the preprocessor data file

      Dependencies.Increment_Last;

      Dependencies.Table (Dependencies.Last) :=

        Source_Index_Of_Preproc_Data_File;

   end Parse_Preprocessing_Data_File;

   ---------------------------

   -- Prepare_To_Preprocess --

   ---------------------------

   procedure Prepare_To_Preprocess

     (Source               : File_Name_Type;

      Preprocessing_Needed : out Boolean)

   is

      Default : Boolean := False;

      Index   : Int := 0;

   begin

      --  By default, preprocessing is not needed

      Preprocessing_Needed := False;

      if No_Preprocessing then

         return;

      end if;

      --  First, look for preprocessing data specific to the current source

      for J in 1 .. Preproc_Data_Table.Last loop

         if Preproc_Data_Table.Table (J).File_Name = Source then

            Index := J;

            Current_Data := Preproc_Data_Table.Table (J);

            exit;

         end if;

      end loop;

      --  If no specific preprocessing data, then take the default

      if Index = 0 then

         if Default_Data_Defined then

            Current_Data := Default_Data;

            Default := True;

         else

            --  If no default, then nothing to do

            return;

         end if;

      end if;

      --  Set the preprocessing flags according to the preprocessing data

      if Current_Data.Comments and then not Current_Data.Always_Blank then

         Comment_Deleted_Lines := True;

         Blank_Deleted_Lines   := False;

      else

         Comment_Deleted_Lines := False;

         Blank_Deleted_Lines   := True;

      end if;

      Undefined_Symbols_Are_False := Current_Data.Undef_False;

      List_Preprocessing_Symbols  := Current_Data.List_Symbols;

      --  If not already done it, process the definition file

      if Current_Data.Processed then

         --  Set Prep.Mapping

         Prep.Mapping := Current_Data.Mapping;

      else

         --  First put the mapping in Prep.Mapping, because Prep.Parse_Def_File

         --  works on Prep.Mapping.

         Prep.Mapping := Current_Data.Mapping;

         String_To_Name_Buffer (Current_Data.Deffile);

         declare

            N           : constant File_Name_Type    := Name_Find;

            Deffile     : constant Source_File_Index :=

                            Load_Definition_File (N);

            Add_Deffile : Boolean                    := True;

            T           : constant Nat               := Total_Errors_Detected;

         begin

            if Deffile = No_Source_File then

               Fail ("definition file """

                     & Get_Name_String (N)

                     & """ not found");

            end if;

            --  Initialize the preprocessor and set the characteristics of the

            --  scanner for a definition file.

            Prep.Setup_Hooks

              (Error_Msg         => Errout.Error_Msg'Access,

               Scan              => Scn.Scanner.Scan'Access,

               Set_Ignore_Errors => Errout.Set_Ignore_Errors'Access,

               Put_Char          => null,

               New_EOL           => null);

            Scn.Scanner.Set_End_Of_Line_As_Token (True);

            Scn.Scanner.Reset_Special_Characters;

            --  Initialize the scanner and process the definition file

            Scn.Scanner.Initialize_Scanner (Deffile);

            Prep.Parse_Def_File;

            --  Reset the behaviour of the scanner to the default

            Scn.Scanner.Set_End_Of_Line_As_Token (False);

            --  Fail if errors were found while processing the definition file

            if T /= Total_Errors_Detected then

               Errout.Finalize (Last_Call => True);

               Errout.Output_Messages;

               Fail ("errors found in definition file """

                     & Get_Name_String (N)

                     & """");

            end if;

            for Index in 1 .. Dependencies.Last loop

               if Dependencies.Table (Index) = Deffile then

                  Add_Deffile := False;

                  exit;

               end if;

            end loop;

            if Add_Deffile then

               Dependencies.Increment_Last;

               Dependencies.Table (Dependencies.Last) := Deffile;

            end if;

         end;

         --  Get back the mapping, indicate that the definition file is

         --  processed and store back the preprocessing data.

         Current_Data.Mapping := Prep.Mapping;

         Current_Data.Processed := True;

         if Default then

            Default_Data := Current_Data;

         else

            Preproc_Data_Table.Table (Index) := Current_Data;

         end if;

      end if;

      Preprocessing_Needed := True;

   end Prepare_To_Preprocess;

   ---------------------------------------------

   -- Process_Command_Line_Symbol_Definitions --

   ---------------------------------------------

   procedure Process_Command_Line_Symbol_Definitions is

      Symbol_Data : Prep.Symbol_Data;

      Found : Boolean := False;

   begin

      Symbol_Table.Init (Command_Line_Symbols);

      --  The command line definitions have been stored temporarily in

      --  array Symbol_Definitions.

      for Index in 1 .. Last_Definition loop

         --  Check each symbol definition, fail immediately if syntax is not

         --  correct.

         Check_Command_Line_Symbol_Definition

           (Definition => Symbol_Definitions (Index).all,

            Data       => Symbol_Data);

         Found := False;

         --  If there is already a definition for this symbol, replace the old

         --  definition by this one.

         for J in 1 .. Symbol_Table.Last (Command_Line_Symbols) loop

            if Command_Line_Symbols.Table (J).Symbol = Symbol_Data.Symbol then

               Command_Line_Symbols.Table (J) := Symbol_Data;

               Found := True;

               exit;

            end if;

         end loop;

         --  Otherwise, create a new entry in the table

         if not Found then

            Symbol_Table.Increment_Last (Command_Line_Symbols);

            Command_Line_Symbols.Table

              (Symbol_Table.Last (Command_Line_Symbols)) := Symbol_Data;

         end if;

      end loop;

   end Process_Command_Line_Symbol_Definitions;

   -------------------------

   -- Skip_To_End_Of_Line --

   -------------------------

   procedure Skip_To_End_Of_Line is

   begin

      Set_Ignore_Errors (To => True);

      while Token /= Tok_End_Of_Line and then Token /= Tok_EOF loop

         Scan;

      end loop;

      Set_Ignore_Errors (To => False);

   end Skip_To_End_Of_Line;

end Prepcomp;