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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                                 F M A P                                  --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 2001-2009, 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 Opt;    use Opt;

with Osint;  use Osint;

with Output; use Output;

with Table;

with Types;  use Types;

with System.OS_Lib; use System.OS_Lib;

with Unchecked_Conversion;

with GNAT.HTable;

package body Fmap is

   No_Mapping_File : Boolean := False;

   --  Set to True when the specified mapping file cannot be read in

   --  procedure Initialize, so that no attempt is made to open the mapping

   --  file in procedure Update_Mapping_File.

   function To_Big_String_Ptr is new Unchecked_Conversion

     (Source_Buffer_Ptr, Big_String_Ptr);

   Max_Buffer : constant := 1_500;

   Buffer : String (1 .. Max_Buffer);

   --  Used to bufferize output when writing to a new mapping file

   Buffer_Last : Natural := 0;

   --  Index of last valid character in Buffer

   type Mapping is record

      Uname : Unit_Name_Type;

      Fname : File_Name_Type;

   end record;

   package File_Mapping is new Table.Table (

     Table_Component_Type => Mapping,

     Table_Index_Type     => Int,

     Table_Low_Bound      => 0,

     Table_Initial        => 1_000,

     Table_Increment      => 1_000,

     Table_Name           => "Fmap.File_Mapping");

   --  Mapping table to map unit names to file names

   package Path_Mapping is new Table.Table (

     Table_Component_Type => Mapping,

     Table_Index_Type     => Int,

     Table_Low_Bound      => 0,

     Table_Initial        => 1_000,

     Table_Increment      => 1_000,

     Table_Name           => "Fmap.Path_Mapping");

   --  Mapping table to map file names to path names

   type Header_Num is range 0 .. 1_000;

   function Hash (F : Unit_Name_Type) return Header_Num;

   --  Function used to compute hash of unit name

   No_Entry : constant Int := -1;

   --  Signals no entry in following table

   package Unit_Hash_Table is new GNAT.HTable.Simple_HTable (

     Header_Num => Header_Num,

     Element    => Int,

     No_Element => No_Entry,

     Key        => Unit_Name_Type,

     Hash       => Hash,

     Equal      => "=");

   --  Hash table to map unit names to file names. Used in conjunction with

   --  table File_Mapping above.

   function Hash (F : File_Name_Type) return Header_Num;

   --  Function used to compute hash of file name

   package File_Hash_Table is new GNAT.HTable.Simple_HTable (

     Header_Num => Header_Num,

     Element    => Int,

     No_Element => No_Entry,

     Key        => File_Name_Type,

     Hash       => Hash,

     Equal      => "=");

   --  Hash table to map file names to path names. Used in conjunction with

   --  table Path_Mapping above.

   Last_In_Table : Int := 0;

   package Forbidden_Names is new GNAT.HTable.Simple_HTable (

     Header_Num => Header_Num,

     Element    => Boolean,

     No_Element => False,

     Key        => File_Name_Type,

     Hash       => Hash,

     Equal      => "=");

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

   -- Add_Forbidden_File_Name --

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

   procedure Add_Forbidden_File_Name (Name : File_Name_Type) is

   begin

      Forbidden_Names.Set (Name, True);

   end Add_Forbidden_File_Name;

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

   -- Add_To_File_Map --

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

   procedure Add_To_File_Map

     (Unit_Name : Unit_Name_Type;

      File_Name : File_Name_Type;

      Path_Name : File_Name_Type)

   is

      Unit_Entry : constant Int := Unit_Hash_Table.Get (Unit_Name);

      File_Entry : constant Int := File_Hash_Table.Get (File_Name);

   begin

      if Unit_Entry = No_Entry or else

        File_Mapping.Table (Unit_Entry).Fname /= File_Name

      then

         File_Mapping.Increment_Last;

         Unit_Hash_Table.Set (Unit_Name, File_Mapping.Last);

         File_Mapping.Table (File_Mapping.Last) :=

           (Uname => Unit_Name, Fname => File_Name);

      end if;

      if File_Entry = No_Entry or else

        Path_Mapping.Table (File_Entry).Fname /= Path_Name

      then

         Path_Mapping.Increment_Last;

         File_Hash_Table.Set (File_Name, Path_Mapping.Last);

         Path_Mapping.Table (Path_Mapping.Last) :=

           (Uname => Unit_Name, Fname => Path_Name);

      end if;

   end Add_To_File_Map;

   ----------

   -- Hash --

   ----------

   function Hash (F : File_Name_Type) return Header_Num is

   begin

      return Header_Num (Int (F) rem Header_Num'Range_Length);

   end Hash;

   function Hash (F : Unit_Name_Type) return Header_Num is

   begin

      return Header_Num (Int (F) rem Header_Num'Range_Length);

   end Hash;

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

   -- Initialize --

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

   procedure Initialize (File_Name : String) is

      Src : Source_Buffer_Ptr;

      Hi  : Source_Ptr;

      BS  : Big_String_Ptr;

      SP  : String_Ptr;

      First : Positive := 1;

      Last  : Natural  := 0;

      Uname : Unit_Name_Type;

      Fname : File_Name_Type;

      Pname : File_Name_Type;

      procedure Empty_Tables;

      --  Remove all entries in case of incorrect mapping file

      function Find_File_Name return File_Name_Type;

      --  Return Error_File_Name if the name buffer contains "/", otherwise

      --  call Name_Find. "/" is the path name in the mapping file to indicate

      --  that a source has been suppressed, and thus should not be found by

      --  the compiler.

      function Find_Unit_Name return Unit_Name_Type;

      --  Return the unit name in the name buffer. Return Error_Unit_Name if

      --  the name buffer contains "/".

      procedure Get_Line;

      --  Get a line from the mapping file, where a line is SP (First .. Last)

      procedure Report_Truncated;

      --  Report a warning when the mapping file is truncated

      --  (number of lines is not a multiple of 3).

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

      -- Empty_Tables --

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

      procedure Empty_Tables is

      begin

         Unit_Hash_Table.Reset;

         File_Hash_Table.Reset;

         Path_Mapping.Set_Last (0);

         File_Mapping.Set_Last (0);

         Last_In_Table := 0;

      end Empty_Tables;

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

      -- Find_File_Name --

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

      function Find_File_Name return File_Name_Type is

      begin

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

            --  A path name of "/" is the indication that the source has been

            --  "suppressed". Return Error_File_Name so that the compiler does

            --  not find the source, even if it is in the include path.

            return Error_File_Name;

         else

            return Name_Find;

         end if;

      end Find_File_Name;

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

      -- Find_Unit_Name --

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

      function Find_Unit_Name return Unit_Name_Type is

      begin

         return Unit_Name_Type (Find_File_Name);

      end Find_Unit_Name;

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

      -- Get_Line --

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

      procedure Get_Line is

         use ASCII;

      begin

         First := Last + 1;

         --  If not at the end of file, skip the end of line

         while First < SP'Last

           and then (SP (First) = CR

                      or else SP (First) = LF

                      or else SP (First) = EOF)

         loop

            First := First + 1;

         end loop;

         --  If not at the end of file, find the end of this new line

         if First < SP'Last and then SP (First) /= EOF then

            Last := First;

            while Last < SP'Last

              and then SP (Last + 1) /= CR

              and then SP (Last + 1) /= LF

              and then SP (Last + 1) /= EOF

            loop

               Last := Last + 1;

            end loop;

         end if;

      end Get_Line;

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

      -- Report_Truncated --

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

      procedure Report_Truncated is

      begin

         Write_Str ("warning: mapping file """);

         Write_Str (File_Name);

         Write_Line (""" is truncated");

      end Report_Truncated;

   --  Start of processing for Initialize

   begin

      Empty_Tables;

      Name_Len := File_Name'Length;

      Name_Buffer (1 .. Name_Len) := File_Name;

      Read_Source_File (Name_Enter, 0, Hi, Src, Config);

      if Src = null then

         Write_Str ("warning: could not read mapping file """);

         Write_Str (File_Name);

         Write_Line ("""");

         No_Mapping_File := True;

      else

         BS := To_Big_String_Ptr (Src);

         SP := BS (1 .. Natural (Hi))'Unrestricted_Access;

         loop

            --  Get the unit name

            Get_Line;

            --  Exit if end of file has been reached

            exit when First > Last;

            if (Last < First + 2) or else (SP (Last - 1) /= '%')

              or else (SP (Last) /= 's' and then SP (Last) /= 'b')

            then

               Write_Line

                 ("warning: mapping file """ & File_Name &

                  """ is incorrectly formatted");

               Write_Line ("Line = """ & SP (First .. Last) & '"');

               Empty_Tables;

               return;

            end if;

            Name_Len := Last - First + 1;

            Name_Buffer (1 .. Name_Len) := SP (First .. Last);

            Uname := Find_Unit_Name;

            --  Get the file name

            Get_Line;

            --  If end of line has been reached, file is truncated

            if First > Last then

               Report_Truncated;

               Empty_Tables;

               return;

            end if;

            Name_Len := Last - First + 1;

            Name_Buffer (1 .. Name_Len) := SP (First .. Last);

            Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));

            Fname := Find_File_Name;

            --  Get the path name

            Get_Line;

            --  If end of line has been reached, file is truncated

            if First > Last then

               Report_Truncated;

               Empty_Tables;

               return;

            end if;

            Name_Len := Last - First + 1;

            Name_Buffer (1 .. Name_Len) := SP (First .. Last);

            Pname := Find_File_Name;

            --  Add the mappings for this unit name

            Add_To_File_Map (Uname, Fname, Pname);

         end loop;

      end if;

      --  Record the length of the two mapping tables

      Last_In_Table := File_Mapping.Last;

   end Initialize;

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

   -- Mapped_File_Name --

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

   function Mapped_File_Name (Unit : Unit_Name_Type) return File_Name_Type is

      The_Index : constant Int := Unit_Hash_Table.Get (Unit);

   begin

      if The_Index = No_Entry then

         return No_File;

      else

         return File_Mapping.Table (The_Index).Fname;

      end if;

   end Mapped_File_Name;

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

   -- Mapped_Path_Name --

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

   function Mapped_Path_Name (File : File_Name_Type) return File_Name_Type is

      Index : Int := No_Entry;

   begin

      if Forbidden_Names.Get (File) then

         return Error_File_Name;

      end if;

      Index := File_Hash_Table.Get (File);

      if Index = No_Entry then

         return No_File;

      else

         return Path_Mapping.Table (Index).Fname;

      end if;

   end Mapped_Path_Name;

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

   -- Reset_Tables --

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

   procedure Reset_Tables is

   begin

      File_Mapping.Init;

      Path_Mapping.Init;

      Unit_Hash_Table.Reset;

      File_Hash_Table.Reset;

      Forbidden_Names.Reset;

      Last_In_Table := 0;

   end Reset_Tables;

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

   -- Update_Mapping_File --

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

   procedure Update_Mapping_File (File_Name : String) is

      File    : File_Descriptor;

      N_Bytes : Integer;

      File_Entry : Int;

      Status : Boolean;

      --  For the call to Close

      procedure Put_Line (Name : Name_Id);

      --  Put Name as a line in the Mapping File

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

      -- Put_Line --

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

      procedure Put_Line (Name : Name_Id) is

      begin

         Get_Name_String (Name);

         --  If the Buffer is full, write it to the file

         if Buffer_Last + Name_Len + 1 > Buffer'Last then

            N_Bytes := Write (File, Buffer (1)'Address, Buffer_Last);

            if N_Bytes < Buffer_Last then

               Fail ("disk full");

            end if;

            Buffer_Last := 0;

         end if;

         --  Add the line to the Buffer

         Buffer (Buffer_Last + 1 .. Buffer_Last + Name_Len) :=

           Name_Buffer (1 .. Name_Len);

         Buffer_Last := Buffer_Last + Name_Len + 1;

         Buffer (Buffer_Last) := ASCII.LF;

      end Put_Line;

   --  Start of Update_Mapping_File

   begin

      --  If the mapping file could not be read, then it will not be possible

      --  to update it.

      if No_Mapping_File then

         return;

      end if;

      --  Only Update if there are new entries in the mappings

      if Last_In_Table < File_Mapping.Last then

         File := Open_Read_Write (Name => File_Name, Fmode => Binary);

         if File /= Invalid_FD then

            if Last_In_Table > 0 then

               Lseek (File, 0, Seek_End);

            end if;

            for Unit in Last_In_Table + 1 .. File_Mapping.Last loop

               Put_Line (Name_Id (File_Mapping.Table (Unit).Uname));

               Put_Line (Name_Id (File_Mapping.Table (Unit).Fname));

               File_Entry :=

                 File_Hash_Table.Get (File_Mapping.Table (Unit).Fname);

               Put_Line (Name_Id (Path_Mapping.Table (File_Entry).Fname));

            end loop;

            --  Before closing the file, write the buffer to the file. It is

            --  guaranteed that the Buffer is not empty, because Put_Line has

            --  been called at least 3 times, and after a call to Put_Line, the

            --  Buffer is not empty.

            N_Bytes := Write (File, Buffer (1)'Address, Buffer_Last);

            if N_Bytes < Buffer_Last then

               Fail ("disk full");

            end if;

            Close (File, Status);

            if not Status then

               Fail ("disk full");

            end if;

         elsif not Quiet_Output then

            Write_Str ("warning: could not open mapping file """);

            Write_Str (File_Name);

            Write_Line (""" for update");

         end if;

      end if;

   end Update_Mapping_File;

end Fmap;