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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             G N A T B I 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 ALI;      use ALI;

with ALI.Util; use ALI.Util;

with Bcheck;   use Bcheck;

with Binde;    use Binde;

with Binderr;  use Binderr;

with Bindgen;  use Bindgen;

with Bindusg;

with Butil;    use Butil;

with Casing;   use Casing;

with Csets;

with Debug;    use Debug;

with Fmap;

with Fname;    use Fname;

with Namet;    use Namet;

with Opt;      use Opt;

with Osint;    use Osint;

with Osint.B;  use Osint.B;

with Output;   use Output;

with Rident;   use Rident;

with Snames;

with Switch;   use Switch;

with Switch.B; use Switch.B;

with Targparm; use Targparm;

with Types;    use Types;

with System.Case_Util; use System.Case_Util;

with System.OS_Lib;    use System.OS_Lib;

with Ada.Command_Line.Response_File; use Ada.Command_Line;

procedure Gnatbind is

   Total_Errors : Nat := 0;

   --  Counts total errors in all files

   Total_Warnings : Nat := 0;

   --  Total warnings in all files

   Main_Lib_File : File_Name_Type;

   --  Current main library file

   First_Main_Lib_File : File_Name_Type := No_File;

   --  The first library file, that should be a main subprogram if neither -n

   --  nor -z are used.

   Std_Lib_File : File_Name_Type;

   --  Standard library

   Text     : Text_Buffer_Ptr;

   Next_Arg : Positive;

   Output_File_Name_Seen : Boolean := False;

   Output_File_Name      : String_Ptr := new String'("");

   L_Switch_Seen : Boolean := False;

   Mapping_File : String_Ptr := null;

   function Gnatbind_Supports_Auto_Init return Boolean;

   --  Indicates if automatic initialization of elaboration procedure

   --  through the constructor mechanism is possible on the platform.

   procedure List_Applicable_Restrictions;

   --  List restrictions that apply to this partition if option taken

   procedure Scan_Bind_Arg (Argv : String);

   --  Scan and process binder specific arguments. Argv is a single argument.

   --  All the one character arguments are still handled by Switch. This

   --  routine handles -aO -aI and -I-. The lower bound of Argv must be 1.

   function Is_Cross_Compiler return Boolean;

   --  Returns True iff this is a cross-compiler

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

   -- Gnatbind_Supports_Auto_Init --

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

   function Gnatbind_Supports_Auto_Init return Boolean is

      function gnat_binder_supports_auto_init return Integer;

      pragma Import (C, gnat_binder_supports_auto_init,

                     "__gnat_binder_supports_auto_init");

   begin

      return gnat_binder_supports_auto_init /= 0;

   end Gnatbind_Supports_Auto_Init;

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

   -- Is_Cross_Compiler --

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

   function Is_Cross_Compiler return Boolean is

      Cross_Compiler : Integer;

      pragma Import (C, Cross_Compiler, "__gnat_is_cross_compiler");

   begin

      return Cross_Compiler = 1;

   end Is_Cross_Compiler;

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

   -- List_Applicable_Restrictions --

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

   procedure List_Applicable_Restrictions is

      --  Define those restrictions that should be output if the gnatbind

      --  -r switch is used. Not all restrictions are output for the reasons

      --  given below in the list, and this array is used to test whether

      --  the corresponding pragma should be listed. True means that it

      --  should not be listed.

      No_Restriction_List : constant array (All_Restrictions) of Boolean :=

        (No_Exception_Propagation => True,

         --  Modifies code resulting in different exception semantics

         No_Exceptions            => True,

         --  Has unexpected Suppress (All_Checks) effect

         No_Implicit_Conditionals => True,

         --  This could modify and pessimize generated code

         No_Implicit_Dynamic_Code => True,

         --  This could modify and pessimize generated code

         No_Implicit_Loops        => True,

         --  This could modify and pessimize generated code

         No_Recursion             => True,

         --  Not checkable at compile time

         No_Reentrancy            => True,

         --  Not checkable at compile time

         Max_Entry_Queue_Length    => True,

         --  Not checkable at compile time

         Max_Storage_At_Blocking  => True,

         --  Not checkable at compile time

         others => False);

      Additional_Restrictions_Listed : Boolean := False;

      --  Set True if we have listed header for restrictions

      function Restriction_Could_Be_Set (R : Restriction_Id) return Boolean;

      --  Returns True if the given restriction can be listed as an additional

      --  restriction that could be set.

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

      -- Restriction_Could_Be_Set --

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

      function Restriction_Could_Be_Set (R : Restriction_Id) return Boolean is

         CR : Restrictions_Info renames Cumulative_Restrictions;

      begin

         case R is

            --  Boolean restriction

            when All_Boolean_Restrictions =>

               --  The condition for listing a boolean restriction as an

               --  additional restriction that could be set is that it is

               --  not violated by any unit, and not already set.

               return CR.Violated (R) = False and then CR.Set (R) = False;

            --  Parameter restriction

            when All_Parameter_Restrictions =>

               --  If the restriction is violated and the level of violation is

               --  unknown, the restriction can definitely not be listed.

               if CR.Violated (R) and then CR.Unknown (R) then

                  return False;

               --  We can list the restriction if it is not set

               elsif not CR.Set (R) then

                  return True;

               --  We can list the restriction if is set to a greater value

               --  than the maximum value known for the violation.

               else

                  return CR.Value (R) > CR.Count (R);

               end if;

            --  No other values for R possible

            when others =>

               raise Program_Error;

         end case;

      end Restriction_Could_Be_Set;

   --  Start of processing for List_Applicable_Restrictions

   begin

      --  Loop through restrictions

      for R in All_Restrictions loop

         if not No_Restriction_List (R)

            and then Restriction_Could_Be_Set (R)

         then

            if not Additional_Restrictions_Listed then

               Write_Eol;

               Write_Line

                 ("The following additional restrictions may be" &

                  " applied to this partition:");

               Additional_Restrictions_Listed := True;

            end if;

            Write_Str ("pragma Restrictions (");

            declare

               S : constant String := Restriction_Id'Image (R);

            begin

               Name_Len := S'Length;

               Name_Buffer (1 .. Name_Len) := S;

            end;

            Set_Casing (Mixed_Case);

            Write_Str (Name_Buffer (1 .. Name_Len));

            if R in All_Parameter_Restrictions then

               Write_Str (" => ");

               Write_Int (Int (Cumulative_Restrictions.Count (R)));

            end if;

            Write_Str (");");

            Write_Eol;

         end if;

      end loop;

   end List_Applicable_Restrictions;

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

   -- Scan_Bind_Arg --

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

   procedure Scan_Bind_Arg (Argv : String) is

      pragma Assert (Argv'First = 1);

   begin

      --  Now scan arguments that are specific to the binder and are not

      --  handled by the common circuitry in Switch.

      if Opt.Output_File_Name_Present

        and then not Output_File_Name_Seen

      then

         Output_File_Name_Seen := True;

         if Argv'Length = 0

           or else (Argv'Length >= 1 and then Argv (1) = '-')

         then

            Fail ("output File_Name missing after -o");

         else

            Output_File_Name := new String'(Argv);

         end if;

      elsif Argv'Length >= 2 and then Argv (1) = '-' then

         --  -I-

         if Argv (2 .. Argv'Last) = "I-" then

            Opt.Look_In_Primary_Dir := False;

         --  -Idir

         elsif Argv (2) = 'I' then

            Add_Src_Search_Dir (Argv (3 .. Argv'Last));

            Add_Lib_Search_Dir (Argv (3 .. Argv'Last));

         --  -Ldir

         elsif Argv (2) = 'L' then

            if Argv'Length >= 3 then

               --  Remember that the -L switch was specified, so that if this

               --  is on OpenVMS, the export names are put in uppercase.

               --  This is not known before the target parameters are read.

               L_Switch_Seen := True;

               Opt.Bind_For_Library := True;

               Opt.Ada_Init_Name :=

                 new String'(Argv (3 .. Argv'Last) & Opt.Ada_Init_Suffix);

               Opt.Ada_Final_Name :=

                 new String'(Argv (3 .. Argv'Last) & Opt.Ada_Final_Suffix);

               Opt.Ada_Main_Name :=

                 new String'(Argv (3 .. Argv'Last) & Opt.Ada_Main_Name_Suffix);

               --  This option (-Lxxx) implies -n

               Opt.Bind_Main_Program := False;

            else

               Fail

                 ("Prefix of initialization and finalization " &

                  "procedure names missing in -L");

            end if;

         --  -Sin -Slo -Shi -Sxx -Sev

         elsif Argv'Length = 4

           and then Argv (2) = 'S'

         then

            declare

               C1 : Character := Argv (3);

               C2 : Character := Argv (4);

            begin

               --  Fold to upper case

               if C1 in 'a' .. 'z' then

                  C1 := Character'Val (Character'Pos (C1) - 32);

               end if;

               if C2 in 'a' .. 'z' then

                  C2 := Character'Val (Character'Pos (C2) - 32);

               end if;

               --  Test valid option and set mode accordingly

               if C1 = 'E' and then C2 = 'V' then

                  null;

               elsif C1 = 'I' and then C2 = 'N' then

                  null;

               elsif C1 = 'L' and then C2 = 'O' then

                  null;

               elsif C1 = 'H' and then C2 = 'I' then

                  null;

               elsif (C1 in '0' .. '9' or else C1 in 'A' .. 'F')

                       and then

                     (C2 in '0' .. '9' or else C2 in 'A' .. 'F')

               then

                  null;

               --  Invalid -S switch, let Switch give error, set default of IN

               else

                  Scan_Binder_Switches (Argv);

                  C1 := 'I';

                  C2 := 'N';

               end if;

               Initialize_Scalars_Mode1 := C1;

               Initialize_Scalars_Mode2 := C2;

            end;

         --  -aIdir

         elsif Argv'Length >= 3

           and then Argv (2 .. 3) = "aI"

         then

            Add_Src_Search_Dir (Argv (4 .. Argv'Last));

         --  -aOdir

         elsif Argv'Length >= 3

           and then Argv (2 .. 3) = "aO"

         then

            Add_Lib_Search_Dir (Argv (4 .. Argv'Last));

         --  -nostdlib

         elsif Argv (2 .. Argv'Last) = "nostdlib" then

            Opt.No_Stdlib := True;

         --  -nostdinc

         elsif Argv (2 .. Argv'Last) = "nostdinc" then

            Opt.No_Stdinc := True;

         --  -static

         elsif Argv (2 .. Argv'Last) = "static" then

            Opt.Shared_Libgnat := False;

         --  -shared

         elsif Argv (2 .. Argv'Last) = "shared" then

            Opt.Shared_Libgnat := True;

         --  -F=mapping_file

         elsif Argv'Length >= 4 and then Argv (2 .. 3) = "F=" then

            if Mapping_File /= null then

               Fail ("cannot specify several mapping files");

            end if;

            Mapping_File := new String'(Argv (4 .. Argv'Last));

         --  -Mname

         elsif Argv'Length >= 3 and then Argv (2) = 'M' then

            if not Is_Cross_Compiler then

               Write_Line

                 ("gnatbind: -M not expected to be used on native platforms");

            end if;

            Opt.Bind_Alternate_Main_Name := True;

            Opt.Alternate_Main_Name := new String'(Argv (3 .. Argv'Last));

         --  All other options are single character and are handled by

         --  Scan_Binder_Switches.

         else

            Scan_Binder_Switches (Argv);

         end if;

      --  Not a switch, so must be a file name (if non-empty)

      elsif Argv'Length /= 0 then

         if Argv'Length > 4

           and then Argv (Argv'Last - 3 .. Argv'Last) = ".ali"

         then

            Add_File (Argv);

         else

            Add_File (Argv & ".ali");

         end if;

      end if;

   end Scan_Bind_Arg;

   procedure Check_Version_And_Help is

      new Check_Version_And_Help_G (Bindusg.Display);

--  Start of processing for Gnatbind

begin

   --  Set default for Shared_Libgnat option

   declare

      Shared_Libgnat_Default : Character;

      pragma Import

        (C, Shared_Libgnat_Default, "__gnat_shared_libgnat_default");

      SHARED : constant Character := 'H';

      STATIC : constant Character := 'T';

   begin

      pragma Assert

        (Shared_Libgnat_Default = SHARED

         or else

        Shared_Libgnat_Default = STATIC);

      Shared_Libgnat := (Shared_Libgnat_Default = SHARED);

   end;

   --  Scan the switches and arguments

   --  First, scan to detect --version and/or --help

   Check_Version_And_Help ("GNATBIND", "1995");

   --  Use low level argument routines to avoid dragging in the secondary stack

   Next_Arg := 1;

   Scan_Args : while Next_Arg < Arg_Count loop

      declare

         Next_Argv : String (1 .. Len_Arg (Next_Arg));

      begin

         Fill_Arg (Next_Argv'Address, Next_Arg);

         if Next_Argv'Length > 0 then

            if Next_Argv (1) = '@' then

               if Next_Argv'Length > 1 then

                  declare

                     Arguments : constant Argument_List :=

                                   Response_File.Arguments_From

                                     (Response_File_Name        =>

                                        Next_Argv (2 .. Next_Argv'Last),

                                      Recursive                 => True,

                                      Ignore_Non_Existing_Files => True);

                  begin

                     for J in Arguments'Range loop

                        Scan_Bind_Arg (Arguments (J).all);

                     end loop;

                  end;

               end if;

            else

               Scan_Bind_Arg (Next_Argv);

            end if;

         end if;

      end;

      Next_Arg := Next_Arg + 1;

   end loop Scan_Args;

   if Use_Pragma_Linker_Constructor then

      if Bind_Main_Program then

         Fail ("switch -a must be used in conjunction with -n or -Lxxx");

      elsif not Gnatbind_Supports_Auto_Init then

         Fail ("automatic initialisation of elaboration " &

               "not supported on this platform");

      end if;

   end if;

   --  Test for trailing -o switch

   if Opt.Output_File_Name_Present

     and then not Output_File_Name_Seen

   then

      Fail ("output file name missing after -o");

   end if;

   --  Output usage if requested

   if Usage_Requested then

      Bindusg.Display;

   end if;

   --  Check that the Ada binder file specified has extension .adb and that

   --  the C binder file has extension .c

   if Opt.Output_File_Name_Present

     and then Output_File_Name_Seen

   then

      Check_Extensions : declare

         Length : constant Natural := Output_File_Name'Length;

         Last   : constant Natural := Output_File_Name'Last;

      begin

         if Ada_Bind_File then

            if Length <= 4

              or else Output_File_Name (Last - 3 .. Last) /= ".adb"

            then

               Fail ("output file name should have .adb extension");

            end if;

         else

            if Length <= 2

              or else Output_File_Name (Last - 1 .. Last) /= ".c"

            then

               Fail ("output file name should have .c extension");

            end if;

         end if;

      end Check_Extensions;

   end if;

   Osint.Add_Default_Search_Dirs;

   --  Carry out package initializations. These are initializations which

   --  might logically be performed at elaboration time, but Namet at least

   --  can't be done that way (because it is used in the Compiler), and we

   --  decide to be consistent. Like elaboration, the order in which these

   --  calls are made is in some cases important.

   Csets.Initialize;

   Namet.Initialize;

   Snames.Initialize;

   --  Acquire target parameters

   Targparm.Get_Target_Parameters;

   --  Initialize Cumulative_Restrictions with the restrictions on the target

   --  scanned from the system.ads file. Then as we read ALI files, we will

   --  accumulate additional restrictions specified in other files.

   Cumulative_Restrictions := Targparm.Restrictions_On_Target;

   --  On OpenVMS, when -L is used, all external names used in pragmas Export

   --  are in upper case. The reason is that on OpenVMS, the macro-assembler

   --  MACASM-32, used to build Stand-Alone Libraries, only understands

   --  uppercase.

   if L_Switch_Seen and then OpenVMS_On_Target then

      To_Upper (Opt.Ada_Init_Name.all);

      To_Upper (Opt.Ada_Final_Name.all);

      To_Upper (Opt.Ada_Main_Name.all);

   end if;

   --  Acquire configurable run-time mode

   if Configurable_Run_Time_On_Target then

      Configurable_Run_Time_Mode := True;

   end if;

   --  Output copyright notice if in verbose mode

   if Verbose_Mode then

      Write_Eol;

      Display_Version ("GNATBIND", "1995");

   end if;

   --  Output usage information if no files

   if not More_Lib_Files then

      Bindusg.Display;

      Exit_Program (E_Fatal);

   end if;

   --  If a mapping file was specified, initialize the file mapping

   if Mapping_File /= null then

      Fmap.Initialize (Mapping_File.all);

   end if;

   --  The block here is to catch the Unrecoverable_Error exception in the

   --  case where we exceed the maximum number of permissible errors or some

   --  other unrecoverable error occurs.

   begin

      --  Initialize binder packages

      Initialize_Binderr;

      Initialize_ALI;

      Initialize_ALI_Source;

      if Verbose_Mode then

         Write_Eol;

      end if;

      --  Input ALI files

      while More_Lib_Files loop

         Main_Lib_File := Next_Main_Lib_File;

         if First_Main_Lib_File = No_File then

            First_Main_Lib_File := Main_Lib_File;

         end if;

         if Verbose_Mode then

            if Check_Only then

               Write_Str ("Checking: ");

            else

               Write_Str ("Binding: ");

            end if;

            Write_Name (Main_Lib_File);

            Write_Eol;

         end if;

         Text := Read_Library_Info (Main_Lib_File, True);

         declare

            Id : ALI_Id;

            pragma Warnings (Off, Id);

         begin

            Id := Scan_ALI

                    (F             => Main_Lib_File,

                     T             => Text,

                     Ignore_ED     => False,

                     Err           => False,

                     Ignore_Errors => Debug_Flag_I);

         end;

         Free (Text);

      end loop;

      --  No_Run_Time mode

      if No_Run_Time_Mode then

         --  Set standard configuration parameters

         Suppress_Standard_Library_On_Target := True;

         Configurable_Run_Time_Mode          := True;

      end if;

      --  For main ALI files, even if they are interfaces, we get their

      --  dependencies. To be sure, we reset the Interface flag for all main

      --  ALI files.

      for Index in ALIs.First .. ALIs.Last loop

         ALIs.Table (Index).SAL_Interface := False;

      end loop;

      --  Add System.Standard_Library to list to ensure that these files are

      --  included in the bind, even if not directly referenced from Ada code

      --  This is suppressed if the appropriate targparm switch is set.

      if not Suppress_Standard_Library_On_Target then

         Name_Buffer (1 .. 12) := "s-stalib.ali";

         Name_Len := 12;

         Std_Lib_File := Name_Find;

         Text := Read_Library_Info (Std_Lib_File, True);

         declare

            Id : ALI_Id;

            pragma Warnings (Off, Id);

         begin

            Id :=

              Scan_ALI

                (F             => Std_Lib_File,

                 T             => Text,

                 Ignore_ED     => False,

                 Err           => False,

                 Ignore_Errors => Debug_Flag_I);

         end;

         Free (Text);

      end if;

      --  Acquire all information in ALI files that have been read in

      for Index in ALIs.First .. ALIs.Last loop

         Read_ALI (Index);

      end loop;

      --  Quit if some file needs compiling

      if No_Object_Specified then

         raise Unrecoverable_Error;

      end if;

      --  Build source file table from the ALI files we have read in

      Set_Source_Table;

      --  If there is main program to bind, set Main_Lib_File to the first

      --  library file, and the name from which to derive the binder generate

      --  file to the first ALI file.

      if Bind_Main_Program then

         Main_Lib_File := First_Main_Lib_File;

         Set_Current_File_Name_Index (To => 1);

      end if;

      --  Check that main library file is a suitable main program

      if Bind_Main_Program

        and then ALIs.Table (ALIs.First).Main_Program = None

        and then not No_Main_Subprogram

      then

         Error_Msg_File_1 := Main_Lib_File;

         Error_Msg ("{ does not contain a unit that can be a main program");

      end if;

      --  Perform consistency and correctness checks

      Check_Duplicated_Subunits;

      Check_Versions;

      Check_Consistency;

      Check_Configuration_Consistency;

      --  List restrictions that could be applied to this partition

      if List_Restrictions then

         List_Applicable_Restrictions;

      end if;

      --  Complete bind if no errors

      if Errors_Detected = 0 then

         Find_Elab_Order;

         if Errors_Detected = 0 then

            --  Display elaboration order if -l was specified