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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             A L I . U T I L                              --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2011, 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 Debug;   use Debug;

with Binderr; use Binderr;

with Opt;     use Opt;

with Output;  use Output;

with Osint;   use Osint;

with Scans;   use Scans;

with Scng;

with Sinput.C;

with Snames;  use Snames;

with Styleg;

package body ALI.Util is

   --  Empty procedures needed to instantiate Scng. Error procedures are

   --  empty, because we don't want to report any errors when computing

   --  a source checksum.

   procedure Post_Scan;

   procedure Error_Msg (Msg : String; Flag_Location : Source_Ptr);

   procedure Error_Msg_S (Msg : String);

   procedure Error_Msg_SC (Msg : String);

   procedure Error_Msg_SP (Msg : String);

   --  Instantiation of Styleg, needed to instantiate Scng

   package Style is new Styleg

     (Error_Msg, Error_Msg_S, Error_Msg_SC, Error_Msg_SP);

   --  A Scanner is needed to get checksum of a source (procedure

   --  Get_File_Checksum).

   package Scanner is new Scng

     (Post_Scan, Error_Msg, Error_Msg_S, Error_Msg_SC, Error_Msg_SP, Style);

   type Header_Num is range 0 .. 1_000;

   function Hash (F : File_Name_Type) return Header_Num;

   --  Function used to compute hash of ALI file name

   package Interfaces is new Simple_HTable (

     Header_Num => Header_Num,

     Element    => Boolean,

     No_Element => False,

     Key        => File_Name_Type,

     Hash       => Hash,

     Equal      => "=");

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

   -- Checksums_Match --

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

   function Checksums_Match (Checksum1, Checksum2 : Word) return Boolean is

   begin

      return Checksum1 = Checksum2 and then Checksum1 /= Checksum_Error;

   end Checksums_Match;

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

   -- Error_Msg --

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

   procedure Error_Msg (Msg : String; Flag_Location : Source_Ptr) is

      pragma Warnings (Off, Msg);

      pragma Warnings (Off, Flag_Location);

   begin

      null;

   end Error_Msg;

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

   -- Error_Msg_S --

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

   procedure Error_Msg_S (Msg : String) is

      pragma Warnings (Off, Msg);

   begin

      null;

   end Error_Msg_S;

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

   -- Error_Msg_SC --

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

   procedure Error_Msg_SC (Msg : String) is

      pragma Warnings (Off, Msg);

   begin

      null;

   end Error_Msg_SC;

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

   -- Error_Msg_SP --

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

   procedure Error_Msg_SP (Msg : String) is

      pragma Warnings (Off, Msg);

   begin

      null;

   end Error_Msg_SP;

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

   -- Get_File_Checksum --

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

   function Get_File_Checksum (Fname : File_Name_Type) return Word is

      Full_Name    : File_Name_Type;

      Source_Index : Source_File_Index;

   begin

      Full_Name := Find_File (Fname, Osint.Source);

      --  If we cannot find the file, then return an impossible checksum,

      --  impossible because checksums have the high order bit zero, so

      --  that checksums do not match.

      if Full_Name = No_File then

         return Checksum_Error;

      end if;

      Source_Index := Sinput.C.Load_File (Get_Name_String (Full_Name));

      if Source_Index = No_Source_File then

         return Checksum_Error;

      end if;

      Scanner.Initialize_Scanner (Source_Index);

      --  Make sure that the project language reserved words are not

      --  recognized as reserved words, but as identifiers. The byte info for

      --  those names have been set if we are in gnatmake.

      Set_Name_Table_Byte (Name_Project,          0);

      Set_Name_Table_Byte (Name_Extends,          0);

      Set_Name_Table_Byte (Name_External,         0);

      Set_Name_Table_Byte (Name_External_As_List, 0);

      --  Scan the complete file to compute its checksum

      loop

         Scanner.Scan;

         exit when Token = Tok_EOF;

      end loop;

      return Scans.Checksum;

   end Get_File_Checksum;

   ----------

   -- Hash --

   ----------

   function Hash (F : File_Name_Type) return Header_Num is

   begin

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

   end Hash;

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

   -- Initialize_ALI_Source --

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

   procedure Initialize_ALI_Source is

   begin

      --  When (re)initializing ALI data structures the ALI user expects to

      --  get a fresh set of data structures. Thus we first need to erase the

      --  marks put in the name table by the previous set of ALI routine calls.

      --  This loop is empty and harmless the first time in.

      for J in Source.First .. Source.Last loop

         Set_Name_Table_Info (Source.Table (J).Sfile, 0);

         Source.Table (J).Source_Found := False;

      end loop;

      Source.Init;

      Interfaces.Reset;

   end Initialize_ALI_Source;

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

   -- Post_Scan --

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

   procedure Post_Scan is

   begin

      null;

   end Post_Scan;

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

   -- Read_Withed_ALIs --

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

   procedure Read_Withed_ALIs

     (Id            : ALI_Id;

      Ignore_Errors : Boolean := False)

   is

      Afile  : File_Name_Type;

      Text   : Text_Buffer_Ptr;

      Idread : ALI_Id;

   begin

      --  Process all dependent units

      for U in ALIs.Table (Id).First_Unit .. ALIs.Table (Id).Last_Unit loop

         for

           W in Units.Table (U).First_With .. Units.Table (U).Last_With

         loop

            Afile := Withs.Table (W).Afile;

            --  Only process if not a generic (Afile /= No_File) and if

            --  file has not been processed already.

            if Afile /= No_File

              and then Get_Name_Table_Info (Afile) = 0

            then

               Text := Read_Library_Info (Afile);

               --  Unless Ignore_Errors is true, return with an error if source

               --  cannot be found. We used to skip this check when we did not

               --  compile library generics separately, but we now always do,

               --  so there is no special case here anymore.

               if Text = null then

                  if not Ignore_Errors then

                     Error_Msg_File_1 := Afile;

                     Error_Msg_File_2 := Withs.Table (W).Sfile;

                     Error_Msg ("{ not found, { must be compiled");

                     Set_Name_Table_Info (Afile, Int (No_Unit_Id));

                     return;

                  end if;

               else

                  --  Enter in ALIs table

                  Idread :=

                    Scan_ALI

                      (F         => Afile,

                       T         => Text,

                       Ignore_ED => False,

                       Err       => False);

                  Free (Text);

                  if ALIs.Table (Idread).Compile_Errors

                    and then not Ignore_Errors

                  then

                     Error_Msg_File_1 := Withs.Table (W).Sfile;

                     Error_Msg ("{ had errors, must be fixed, and recompiled");

                     Set_Name_Table_Info (Afile, Int (No_Unit_Id));

                  elsif ALIs.Table (Idread).No_Object

                    and then not Ignore_Errors

                  then

                     Error_Msg_File_1 := Withs.Table (W).Sfile;

                     Error_Msg ("{ must be recompiled");

                     Set_Name_Table_Info (Afile, Int (No_Unit_Id));

                  end if;

                  --  If the Unit is an Interface to a Stand-Alone Library,

                  --  set the Interface flag in the Withs table, so that its

                  --  dependant are not considered for elaboration order.

                  if ALIs.Table (Idread).SAL_Interface then

                     Withs.Table (W).SAL_Interface := True;

                     Interface_Library_Unit := True;

                     --  Set the entry in the Interfaces hash table, so that

                     --  other units that import this unit will set the flag

                     --  in their entry in the Withs table.

                     Interfaces.Set (Afile, True);

                  else

                     --  Otherwise, recurse to get new dependents

                     Read_Withed_ALIs (Idread);

                  end if;

               end if;

            --  If the ALI file has already been processed and is an interface,

            --  set the flag in the entry of the Withs table.

            elsif Interface_Library_Unit and then Interfaces.Get (Afile) then

               Withs.Table (W).SAL_Interface := True;

            end if;

         end loop;

      end loop;

   end Read_Withed_ALIs;

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

   -- Set_Source_Table --

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

   procedure Set_Source_Table (A : ALI_Id) is

      F     : File_Name_Type;

      S     : Source_Id;

      Stamp : Time_Stamp_Type;

   begin

      Sdep_Loop : for D in

        ALIs.Table (A).First_Sdep .. ALIs.Table (A).Last_Sdep

      loop

         F := Sdep.Table (D).Sfile;

         if F /= No_File then

            --  If this is the first time we are seeing this source file,

            --  then make a new entry in the source table.

            if Get_Name_Table_Info (F) = 0 then

               Source.Increment_Last;

               S := Source.Last;

               Set_Name_Table_Info (F, Int (S));

               Source.Table (S).Sfile := F;

               Source.Table (S).All_Timestamps_Match := True;

               --  Initialize checksum fields

               Source.Table (S).Checksum := Sdep.Table (D).Checksum;

               Source.Table (S).All_Checksums_Match := True;

               --  In check source files mode, try to get time stamp from file

               if Opt.Check_Source_Files then

                  Stamp := Source_File_Stamp (F);

                  --  If we got the stamp, then set the stamp in the source

                  --  table entry and mark it as set from the source so that

                  --  it does not get subsequently changed.

                  if Stamp (Stamp'First) /= ' ' then

                     Source.Table (S).Stamp := Stamp;

                     Source.Table (S).Source_Found := True;

                  --  If we could not find the file, then the stamp is set

                  --  from the dependency table entry (to be possibly reset

                  --  if we find a later stamp in subsequent processing)

                  else

                     Source.Table (S).Stamp := Sdep.Table (D).Stamp;

                     Source.Table (S).Source_Found := False;

                     --  In All_Sources mode, flag error of file not found

                     if Opt.All_Sources then

                        Error_Msg_File_1 := F;

                        Error_Msg ("cannot locate {");

                     end if;

                  end if;

               --  First time for this source file, but Check_Source_Files

               --  is off, so simply initialize the stamp from the Sdep entry

               else

                  Source.Table (S).Source_Found := False;

                  Source.Table (S).Stamp := Sdep.Table (D).Stamp;

               end if;

            --  Here if this is not the first time for this source file,

            --  so that the source table entry is already constructed.

            else

               S := Source_Id (Get_Name_Table_Info (F));

               --  Update checksum flag

               if not Checksums_Match

                        (Sdep.Table (D).Checksum, Source.Table (S).Checksum)

               then

                  Source.Table (S).All_Checksums_Match := False;

               end if;

               --  Check for time stamp mismatch

               if Sdep.Table (D).Stamp /= Source.Table (S).Stamp then

                  Source.Table (S).All_Timestamps_Match := False;

                  --  When we have a time stamp mismatch, we go look for the

                  --  source file even if Check_Source_Files is false, since

                  --  if we find it, then we can use it to resolve which of the

                  --  two timestamps in the ALI files is likely to be correct.

                  if not Check_Source_Files then

                     Stamp := Source_File_Stamp (F);

                     if Stamp (Stamp'First) /= ' ' then

                        Source.Table (S).Stamp := Stamp;

                        Source.Table (S).Source_Found := True;

                     end if;

                  end if;

                  --  If the stamp in the source table entry was set from the

                  --  source file, then we do not change it (the stamp in the

                  --  source file is always taken as the "right" one).

                  if Source.Table (S).Source_Found then

                     null;

                  --  Otherwise, we have no source file available, so we guess

                  --  that the later of the two timestamps is the right one.

                  --  Note that this guess only affects which error messages

                  --  are issued later on, not correct functionality.

                  else

                     if Sdep.Table (D).Stamp > Source.Table (S).Stamp then

                        Source.Table (S).Stamp := Sdep.Table (D).Stamp;

                     end if;

                  end if;

               end if;

            end if;

            --  Set the checksum value in the source table

            S := Source_Id (Get_Name_Table_Info (F));

            Source.Table (S).Checksum := Sdep.Table (D).Checksum;

         end if;

      end loop Sdep_Loop;

   end Set_Source_Table;

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

   -- Set_Source_Table --

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

   procedure Set_Source_Table is

   begin

      for A in ALIs.First .. ALIs.Last loop

         Set_Source_Table (A);

      end loop;

   end Set_Source_Table;

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

   -- Time_Stamp_Mismatch --

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

   function Time_Stamp_Mismatch

     (A         : ALI_Id;

      Read_Only : Boolean := False) return File_Name_Type

   is

      Src : Source_Id;

      --  Source file Id for the current Sdep entry

   begin

      for D in ALIs.Table (A).First_Sdep .. ALIs.Table (A).Last_Sdep loop

         Src := Source_Id (Get_Name_Table_Info (Sdep.Table (D).Sfile));

         if Opt.Minimal_Recompilation

           and then Sdep.Table (D).Stamp /= Source.Table (Src).Stamp

         then

            --  If minimal recompilation is in action, replace the stamp

            --  of the source file in the table if checksums match.

            --  ??? It is probably worth updating the ALI file with a new

            --  field to avoid recomputing it each time.

            if Checksums_Match

                 (Get_File_Checksum (Sdep.Table (D).Sfile),

                  Source.Table (Src).Checksum)

            then

               if Verbose_Mode then

                  Write_Str ("   ");

                  Write_Str (Get_Name_String (Sdep.Table (D).Sfile));

                  Write_Str (": up to date, different timestamps " &

                             "but same checksum");

                  Write_Eol;

               end if;

               Sdep.Table (D).Stamp := Source.Table (Src).Stamp;

            end if;

         end if;

         if (not Read_Only) or else Source.Table (Src).Source_Found then

            if not Source.Table (Src).Source_Found

              or else Sdep.Table (D).Stamp /= Source.Table (Src).Stamp

            then

               --  If -dt debug flag set, output time stamp found/expected

               if Source.Table (Src).Source_Found and then Debug_Flag_T then

                  Write_Str ("Source: """);

                  Get_Name_String (Sdep.Table (D).Sfile);

                  Write_Str (Name_Buffer (1 .. Name_Len));

                  Write_Line ("""");

                  Write_Str ("   time stamp expected: ");

                  Write_Line (String (Sdep.Table (D).Stamp));

                  Write_Str ("      time stamp found: ");

                  Write_Line (String (Source.Table (Src).Stamp));

               end if;

               --  Return the source file

               return Source.Table (Src).Sfile;

            end if;

         end if;

      end loop;

      return No_File;

   end Time_Stamp_Mismatch;

end ALI.Util;