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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                            B A C K _ E N D                               --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2009, 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 Atree;     use Atree;

with Debug;     use Debug;

with Elists;    use Elists;

with Lib;       use Lib;

with Osint;     use Osint;

with Opt;       use Opt;

with Osint.C;   use Osint.C;

with Namet;     use Namet;

with Nlists;    use Nlists;

with Stand;     use Stand;

with Sinput;    use Sinput;

with Stringt;   use Stringt;

with Switch;    use Switch;

with Switch.C;  use Switch.C;

with System;    use System;

with Types;     use Types;

package body Back_End is

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

   -- Call_Back_End --

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

   procedure Call_Back_End (Mode : Back_End_Mode_Type) is

      --  The Source_File_Record type has a lot of components that are

      --  meaningless to the back end, so a new record type is created

      --  here to contain the needed information for each file.

      type File_Info_Type is record

         File_Name        : File_Name_Type;

         Num_Source_Lines : Nat;

      end record;

      File_Info_Array : array (1 .. Last_Source_File) of File_Info_Type;

      procedure gigi

        (gnat_root                     : Int;

         max_gnat_node                 : Int;

         number_name                   : Nat;

         nodes_ptr                     : Address;

         next_node_ptr                 : Address;

         prev_node_ptr                 : Address;

         elists_ptr                    : Address;

         elmts_ptr                     : Address;

         strings_ptr                   : Address;

         string_chars_ptr              : Address;

         list_headers_ptr              : Address;

         number_file                   : Nat;

         file_info_ptr                 : Address;

         gigi_standard_boolean         : Entity_Id;

         gigi_standard_integer         : Entity_Id;

         gigi_standard_long_long_float : Entity_Id;

         gigi_standard_exception_type  : Entity_Id;

         gigi_operating_mode           : Back_End_Mode_Type);

      pragma Import (C, gigi);

   begin

      --  Skip call if in -gnatdH mode

      if Debug_Flag_HH then

         return;

      end if;

      for J in 1 .. Last_Source_File loop

         File_Info_Array (J).File_Name        := Full_Debug_Name (J);

         File_Info_Array (J).Num_Source_Lines := Num_Source_Lines (J);

      end loop;

      gigi

        (gnat_root          => Int (Cunit (Main_Unit)),

         max_gnat_node      => Int (Last_Node_Id - First_Node_Id + 1),

         number_name        => Name_Entries_Count,

         nodes_ptr          => Nodes_Address,

         next_node_ptr      => Next_Node_Address,

         prev_node_ptr      => Prev_Node_Address,

         elists_ptr         => Elists_Address,

         elmts_ptr          => Elmts_Address,

         strings_ptr        => Strings_Address,

         string_chars_ptr   => String_Chars_Address,

         list_headers_ptr   => Lists_Address,

         number_file        => Num_Source_Files,

         file_info_ptr                 => File_Info_Array'Address,

         gigi_standard_boolean         => Standard_Boolean,

         gigi_standard_integer         => Standard_Integer,

         gigi_standard_long_long_float => Standard_Long_Long_Float,

         gigi_standard_exception_type  => Standard_Exception_Type,

         gigi_operating_mode           => Mode);

   end Call_Back_End;

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

   -- Scan_Compiler_Arguments --

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

   procedure Scan_Compiler_Arguments is

      Next_Arg : Pos := 1;

      type Arg_Array is array (Nat) of Big_String_Ptr;

      type Arg_Array_Ptr is access Arg_Array;

      flag_stack_check : Int;

      pragma Import (C, flag_stack_check);

      --  Import from toplev.c

      save_argc : Nat;

      pragma Import (C, save_argc);

      --  Import from toplev.c

      save_argv : Arg_Array_Ptr;

      pragma Import (C, save_argv);

      --  Import from toplev.c

      Output_File_Name_Seen : Boolean := False;

      --  Set to True after having scanned file_name for switch "-gnatO file"

      --  Local functions

      function Len_Arg (Arg : Pos) return Nat;

      --  Determine length of argument number Arg on the original command line

      --  from gnat1.

      procedure Scan_Back_End_Switches (Switch_Chars : String);

      --  Procedure to scan out switches stored in Switch_Chars. The first

      --  character is known to be a valid switch character, and there are no

      --  blanks or other switch terminator characters in the string, so the

      --  entire string should consist of valid switch characters, except that

      --  an optional terminating NUL character is allowed.

      --

      --  Back end switches have already been checked and processed by GCC in

      --  toplev.c, so no errors can occur and control will always return. The

      --  switches must still be scanned to skip "-o" or internal GCC switches

      --  with their argument.

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

      -- Len_Arg --

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

      function Len_Arg (Arg : Pos) return Nat is

      begin

         for J in 1 .. Nat'Last loop

            if save_argv (Arg).all (Natural (J)) = ASCII.NUL then

               return J - 1;

            end if;

         end loop;

         raise Program_Error;

      end Len_Arg;

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

      -- Scan_Back_End_Switches --

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

      procedure Scan_Back_End_Switches (Switch_Chars : String) is

         First : constant Positive := Switch_Chars'First + 1;

         Last  : constant Natural  := Switch_Last (Switch_Chars);

      begin

         --  Skip -o or internal GCC switches together with their argument

         if Switch_Chars (First .. Last) = "o"

           or else Is_Internal_GCC_Switch (Switch_Chars)

         then

            Next_Arg := Next_Arg + 1;

         --  Do not record -quiet switch

         elsif Switch_Chars (First .. Last) = "quiet" then

            null;

         --  Store any other GCC switches

         else

            Store_Compilation_Switch (Switch_Chars);

            --  Special check, the back end switch -fno-inline also sets the

            --  front end flag to entirely inhibit all inlining.

            if Switch_Chars (First .. Last) = "fno-inline" then

               Opt.Suppress_All_Inlining := True;

            --  Another special check, the switch -fpreserve-control-flow

            --  which is also a back end switch sets the front end flag

            --  that inhibits improper control flow transformations.

            elsif Switch_Chars (First .. Last) = "fpreserve-control-flow" then

               Opt.Suppress_Control_Flow_Optimizations := True;

            end if;

         end if;

      end Scan_Back_End_Switches;

   --  Start of processing for Scan_Compiler_Arguments

   begin

      --  Acquire stack checking mode directly from GCC

      Opt.Stack_Checking_Enabled := (flag_stack_check /= 0);

      --  Loop through command line arguments, storing them for later access

      while Next_Arg < save_argc loop

         Look_At_Arg : declare

            Argv_Ptr : constant Big_String_Ptr := save_argv (Next_Arg);

            Argv_Len : constant Nat            := Len_Arg (Next_Arg);

            Argv     : constant String         :=

                         Argv_Ptr (1 .. Natural (Argv_Len));

         begin

            --  If the previous switch has set the Output_File_Name_Present

            --  flag (that is we have seen a -gnatO), then the next argument

            --  is the name of the output object file.

            if Output_File_Name_Present

              and then not Output_File_Name_Seen

            then

               if Is_Switch (Argv) then

                  Fail ("Object file name missing after -gnatO");

               else

                  Set_Output_Object_File_Name (Argv);

                  Output_File_Name_Seen := True;

               end if;

            --  If the previous switch has set the Search_Directory_Present

            --  flag (that is if we have just seen -I), then the next argument

            --  is a search directory path.

            elsif Search_Directory_Present then

               if Is_Switch (Argv) then

                  Fail ("search directory missing after -I");

               else

                  Add_Src_Search_Dir (Argv);

                  Search_Directory_Present := False;

               end if;

            elsif not Is_Switch (Argv) then -- must be a file name

               Add_File (Argv);

            --  We must recognize -nostdinc to suppress visibility on the

            --  standard GNAT RTL sources. This is also a gcc switch.

            elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdinc" then

               Opt.No_Stdinc := True;

               Scan_Back_End_Switches (Argv);

            --  We must recognize -nostdlib to suppress visibility on the

            --  standard GNAT RTL objects.

            elsif Argv (Argv'First + 1 .. Argv'Last) = "nostdlib" then

               Opt.No_Stdlib := True;

            elsif Is_Front_End_Switch (Argv) then

               Scan_Front_End_Switches (Argv);

            --  All non-front-end switches are back-end switches

            else

               Scan_Back_End_Switches (Argv);

            end if;

         end Look_At_Arg;

         Next_Arg := Next_Arg + 1;

      end loop;

   end Scan_Compiler_Arguments;

end Back_End;