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--  Error message handling.
--  Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
--
--  GHDL is free software; you can redistribute it and/or modify it under
--  the terms of the GNU General Public License as published by the Free
--  Software Foundation; either version 2, or (at your option) any later
--  version.
--
--  GHDL is distributed in the hope that it will be useful, but WITHOUT 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
--  along with GHDL; see the file COPYING.  If not, write to the Free
--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
--  02111-1307, USA.

with Name_Table;
with Files_Map; use Files_Map;
with Str_Table;

with Vhdl.Errors; use Vhdl.Errors;

package body Errorout is
   --  Messages in a group.
   --  Set to 0 for individual messages,
   --  Set to 1 .. n for messages in a group.
   In_Group : Natural := 0;

   Report_Handler : Report_Msg_Handler;

   procedure Set_Report_Handler (Handler : Report_Msg_Handler) is
   begin
      Report_Handler := Handler;
   end Set_Report_Handler;

   function Natural_Image (Val: Natural) return String
   is
      Str: constant String := Natural'Image (Val);
   begin
      return Str (Str'First + 1 .. Str'Last);
   end Natural_Image;

   function Get_Error_Col (E : Error_Record) return Natural
   is
      Line_Pos : Source_Ptr;
   begin
      Line_Pos := File_Line_To_Position (E.File, E.Line);
      return Coord_To_Col (E.File, Line_Pos, E.Offset);
   end Get_Error_Col;

   --  Warnings.

   Warnings_Control : Warnings_Setting := Default_Warnings;

   procedure Enable_Warning (Id : Msgid_Warnings; Enable : Boolean) is
   begin
      Warnings_Control (Id).Enabled := Enable;
   end Enable_Warning;

   function Is_Warning_Enabled (Id : Msgid_Warnings) return Boolean is
   begin
      return Warnings_Control (Id).Enabled;
   end Is_Warning_Enabled;

   procedure Warning_Error (Id : Msgid_All_Warnings; As_Error : Boolean) is
   begin
      Warnings_Control (Id).Error := As_Error;
   end Warning_Error;

   function Is_Warning_Error (Id : Msgid_All_Warnings) return Boolean is
   begin
      return Warnings_Control (Id).Error;
   end Is_Warning_Error;

   function Warning_Image (Id : Msgid_Warnings) return String
   is
      Img : constant String := Msgid_Warnings'Image (Id);

      --  Prefix to strip.
      Prefix : constant String := "WARNID_";
      pragma Assert (Img'Length > Prefix'Length);
      pragma Assert (Img (1 .. Prefix'Length) = Prefix);
      Res : String (1 .. Img'Last - Prefix'Length);
      C : Character;
   begin
      --  Convert to lower cases, and '_' to '-'.
      for I in Res'Range loop
         C := Img (Prefix'Length + I);
         case C is
            when '_' =>
               C := '-';
            when 'A' .. 'Z' =>
               C := Character'Val (Character'Pos (C) + 32);
            when others =>
               raise Internal_Error;
         end case;
         Res (I) := C;
      end loop;

      return Res;
   end Warning_Image;

   procedure Save_Warnings_Setting (Res : out Warnings_Setting) is
   begin
      Res := Warnings_Control;
   end Save_Warnings_Setting;

   procedure Disable_All_Warnings is
   begin
      Warnings_Control := (others => (Enabled => False, Error => False));
   end Disable_All_Warnings;

   procedure Restore_Warnings_Setting (Res : Warnings_Setting) is
   begin
      Warnings_Control := Res;
   end Restore_Warnings_Setting;

   --  Error arguments

   function "+" (V : Location_Type) return Earg_Type is
   begin
      return (Kind => Earg_Location, Val_Loc => V);
   end "+";

   function "+" (V : Name_Id) return Earg_Type is
   begin
      return (Kind => Earg_Id, Val_Id => V);
   end "+";

   function "+" (V : Character) return Earg_Type is
   begin
      return (Kind => Earg_Char, Val_Char => V);
   end "+";

   function "+" (V : Uns32) return Earg_Type is
   begin
      return (Kind => Earg_Uns32, Val_Uns32 => V);
   end "+";

   function "+" (V : Int32) return Earg_Type is
   begin
      return (Kind => Earg_Int32, Val_Int32 => V);
   end "+";

   function "+" (V : String8_Len_Type) return Earg_Type is
   begin
      return (Kind => Earg_String8, Val_Str8 => V);
   end "+";

   function "+" (L : Location_Type) return Source_Coord_Type
   is
      Res : Source_Coord_Type;
   begin
      Files_Map.Location_To_Coord
        (L, Res.File, Res.Line_Pos, Res.Line, Res.Offset);
      return Res;
   end "+";

   procedure Report_Vhdl_Token (Tok : Vhdl.Tokens.Token_Type)
   is
      use Vhdl.Tokens;
   begin
      case Tok is
         when Tok_Identifier =>
            Report_Handler.Message ("an identifier");
         when Tok_Eof =>
            Report_Handler.Message ("end of file");
         when others =>
            Report_Handler.Message ("'");
            Report_Handler.Message (Image (Tok));
            Report_Handler.Message ("'");
      end case;
   end Report_Vhdl_Token;

   procedure Report_Msg (Id : Msgid_Type;
                         Origin : Report_Origin;
                         Loc : Source_Coord_Type;
                         Msg : String;
                         Args : Earg_Arr := No_Eargs)
   is
      procedure Location_To_Position (Location : Location_Type;
                                      File : out Source_File_Entry;
                                      Line : out Natural;
                                      Col : out Natural)
      is
         Name : Name_Id;
         Line_Pos : Source_Ptr;
         Offset : Natural;
      begin
         Location_To_Coord (Location, File, Line_Pos, Line, Offset);
         Coord_To_Position (File, Line_Pos, Offset, Name, Col);
      end Location_To_Position;

      New_Id : Msgid_Type;
   begin
      --  Discard warnings that aren't enabled.
      if Id in Msgid_Warnings and then not Is_Warning_Enabled (Id) then
         return;
      end if;

      --  Reclassify warnings to errors if -Werror.
      if Id in Msgid_All_Warnings and then Is_Warning_Error (Id) then
         New_Id := Msgid_Error;
      else
         New_Id := Id;
      end if;
      pragma Unreferenced (Id);

      if In_Group <= 1
        and then New_Id = Msgid_Error
      then
         if Nbr_Errors = Max_Nbr_Errors then
            --  Limit reached.  Emit a message on the first message.
            Report_Handler.Error_Start
              (Err => (Option, Msgid_Error,
                       No_Source_File_Entry, 0, 0, 0));
            Report_Handler.Message ("error limit reached");
            Report_Handler.Message_End.all;
         end if;

         Nbr_Errors := Nbr_Errors + 1;
      end if;

      --  Limit the number of errors.
      if New_Id = Msgid_Error and then Nbr_Errors > Max_Nbr_Errors then
         return;
      end if;

      Report_Handler.Error_Start
        (Err => (Origin, New_Id,
                 Loc.File, Loc.Line, Loc.Offset, 0));

      if In_Group > 0 then
         In_Group := In_Group + 1;
      end if;

      --  Display message.
      declare
         First, N : Positive;
         Argn : Integer;
      begin
         N := Msg'First;
         First := N;
         Argn := Args'First;
         while N <= Msg'Last loop
            if Msg (N) = '%' then
               Report_Handler.Message (Msg (First .. N - 1));
               First := N + 2;
               pragma Assert (N < Msg'Last);
               N := N + 1;
               case Msg (N) is
                  when '%' =>
                     Report_Handler.Message ("%");
                     Argn := Argn - 1;
                  when 'i' =>
                     --  Identifier.
                     declare
                        Arg : Earg_Type renames Args (Argn);
                        Id : Name_Id;
                     begin
                        Report_Handler.Message ("""");
                        case Arg.Kind is
                           when Earg_Vhdl_Node =>
                              Id := Vhdl.Nodes.Get_Identifier
                                (Arg.Val_Vhdl_Node);
                           when Earg_Id =>
                              Id := Arg.Val_Id;
                           when others =>
                              --  Invalid conversion to identifier.
                              raise Internal_Error;
                        end case;
                        Report_Handler.Message (Name_Table.Image (Id));
                        Report_Handler.Message ("""");
                     end;
                  when 'c' =>
                     --  Character
                     declare
                        Arg : Earg_Type renames Args (Argn);
                     begin
                        Report_Handler.Message ("'");
                        case Arg.Kind is
                           when Earg_Char =>
                              Report_Handler.Message ((1 => Arg.Val_Char));
                           when others =>
                              --  Invalid conversion to character.
                              raise Internal_Error;
                        end case;
                        Report_Handler.Message ("'");
                     end;
                  when 't' =>
                     --  A token
                     declare
                        Arg : Earg_Type renames Args (Argn);
                     begin
                        case Arg.Kind is
                           when Earg_Vhdl_Token =>
                              Report_Vhdl_Token (Arg.Val_Vhdl_Tok);
                           when others =>
                              --  Invalid conversion to character.
                              raise Internal_Error;
                        end case;
                     end;
                  when 'l' =>
                     --  Location
                     declare
                        Arg : Earg_Type renames Args (Argn);
                        Arg_Loc : Location_Type;
                        Arg_File : Source_File_Entry;
                        Arg_Line : Natural;
                        Arg_Col : Natural;
                     begin
                        case Arg.Kind is
                           when Earg_Location =>
                              Arg_Loc := Arg.Val_Loc;
                           when Earg_Vhdl_Node =>
                              Arg_Loc := Vhdl.Nodes.Get_Location
                                (Arg.Val_Vhdl_Node);
                           when others =>
                              raise Internal_Error;
                        end case;
                        Location_To_Position
                          (Arg_Loc, Arg_File, Arg_Line, Arg_Col);

                        --  Do not print the filename if in the same file as
                        --  the error location.
                        if Arg_File = Loc.File then
                           Report_Handler.Message ("line ");
                        else
                           Report_Handler.Message
                             (Name_Table.Image (Get_File_Name (Arg_File)));
                           Report_Handler.Message (":");
                        end if;
                        Report_Handler.Message (Natural_Image (Arg_Line));
                        Report_Handler.Message (":");
                        Report_Handler.Message (Natural_Image (Arg_Col));
                     end;
                  when 'n' =>


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