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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                              C O M P E R R                               --

--                                                                          --

--                                 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 AdaCore.                         --

--                                                                          --

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

--  This package contains routines called when a fatal internal compiler error

--  is detected. Calls to these routines cause termination of the current

--  compilation with appropriate error output.

with Atree;    use Atree;

with Debug;    use Debug;

with Errout;   use Errout;

with Gnatvsn;  use Gnatvsn;

with Lib;      use Lib;

with Namet;    use Namet;

with Opt;      use Opt;

with Osint;    use Osint;

with Output;   use Output;

with Sinfo;    use Sinfo;

with Sinput;   use Sinput;

with Sprint;   use Sprint;

with Sdefault; use Sdefault;

with Targparm; use Targparm;

with Treepr;   use Treepr;

with Types;    use Types;

with Ada.Exceptions; use Ada.Exceptions;

with System.OS_Lib;     use System.OS_Lib;

with System.Soft_Links; use System.Soft_Links;

package body Comperr is

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

   -- Local Data --

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

   Abort_In_Progress : Boolean := False;

   --  Used to prevent runaway recursion if something segfaults

   --  while processing a previous abort.

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

   -- Local Subprograms --

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

   procedure Repeat_Char (Char : Character; Col : Nat; After : Character);

   --  Output Char until current column is at or past Col, and then output

   --  the character given by After (if column is already past Col on entry,

   --  then the effect is simply to output the After character).

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

   -- Compiler_Abort --

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

   procedure Compiler_Abort

     (X            : String;

      Code         : Integer := 0;

      Fallback_Loc : String := "")

   is

      --  The procedures below output a "bug box" with information about

      --  the cause of the compiler abort and about the preferred method

      --  of reporting bugs. The default is a bug box appropriate for

      --  the FSF version of GNAT, but there are specializations for

      --  the GNATPRO and Public releases by AdaCore.

      XF : constant Positive := X'First;

      --  Start index, usually 1, but we won't assume this

      procedure End_Line;

      --  Add blanks up to column 76, and then a final vertical bar

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

      -- End_Line --

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

      procedure End_Line is

      begin

         Repeat_Char (' ', 76, '|');

         Write_Eol;

      end End_Line;

      Is_GPL_Version : constant Boolean := Gnatvsn.Build_Type = GPL;

      Is_FSF_Version : constant Boolean := Gnatvsn.Build_Type = FSF;

   --  Start of processing for Compiler_Abort

   begin

      Cancel_Special_Output;

      --  Prevent recursion through Compiler_Abort, e.g. via SIGSEGV

      if Abort_In_Progress then

         Exit_Program (E_Abort);

      end if;

      Abort_In_Progress := True;

      --  Generate a "standard" error message instead of a bug box in case of

      --  .NET compiler, since we do not support all constructs of the

      --  language. Of course ideally, we should detect this before bombing

      --  on e.g. an assertion error, but in practice most of these bombs

      --  are due to a legitimate case of a construct not being supported (in

      --  a sense they all are, since for sure we are not supporting something

      --  if we bomb!) By giving this message, we provide a more reasonable

      --  practical interface, since giving scary bug boxes on unsupported

      --  features is definitely not helpful.

      --  Similarly if we are generating SCIL, an error message is sufficient

      --  instead of generating a bug box.

      --  Note that the call to Error_Msg_N below sets Serious_Errors_Detected

      --  to 1, so we use the regular mechanism below in order to display a

      --  "compilation abandoned" message and exit, so we still know we have

      --  this case (and -gnatdk can still be used to get the bug box).

      if (VM_Target = CLI_Target or else CodePeer_Mode)

        and then Serious_Errors_Detected = 0

        and then not Debug_Flag_K

        and then Sloc (Current_Error_Node) > No_Location

      then

         if VM_Target = CLI_Target then

            Error_Msg_N

              ("unsupported construct in this context",

               Current_Error_Node);

         else

            Error_Msg_N ("cannot generate 'S'C'I'L", Current_Error_Node);

         end if;

      end if;

      --  If we are in CodePeer mode, we must also delete SCIL files

      if CodePeer_Mode then

         Delete_SCIL_Files;

      end if;

      --  If any errors have already occurred, then we guess that the abort

      --  may well be caused by previous errors, and we don't make too much

      --  fuss about it, since we want to let programmer fix the errors first.

      --  Debug flag K disables this behavior (useful for debugging)

      if Serious_Errors_Detected /= 0 and then not Debug_Flag_K then

         Errout.Finalize (Last_Call => True);

         Errout.Output_Messages;

         Set_Standard_Error;

         Write_Str ("compilation abandoned due to previous error");

         Write_Eol;

         Set_Standard_Output;

         Source_Dump;

         Tree_Dump;

         Exit_Program (E_Errors);

      --  Otherwise give message with details of the abort

      else

         Set_Standard_Error;

         --  Generate header for bug box

         Write_Char ('+');

         Repeat_Char ('=', 29, 'G');

         Write_Str ("NAT BUG DETECTED");

         Repeat_Char ('=', 76, '+');

         Write_Eol;

         --  Output GNAT version identification

         Write_Str ("| ");

         Write_Str (Gnat_Version_String);

         Write_Str (" (");

         --  Output target name, deleting junk final reverse slash

         if Target_Name.all (Target_Name.all'Last) = '\'

           or else Target_Name.all (Target_Name.all'Last) = '/'

         then

            Write_Str (Target_Name.all (1 .. Target_Name.all'Last - 1));

         else

            Write_Str (Target_Name.all);

         end if;

         --  Output identification of error

         Write_Str (") ");

         if X'Length + Column > 76 then

            if Code < 0 then

               Write_Str ("GCC error:");

            end if;

            End_Line;

            Write_Str ("| ");

         end if;

         if X'Length > 70 then

            declare

               Last_Blank : Integer := 70;

            begin

               for P in 39 .. 68 loop

                  if X (XF + P) = ' ' then

                     Last_Blank := P;

                  end if;

               end loop;

               Write_Str (X (XF .. XF - 1 + Last_Blank));

               End_Line;

               Write_Str ("|    ");

               Write_Str (X (XF + Last_Blank .. X'Last));

            end;

         else

            Write_Str (X);

         end if;

         if Code > 0 then

            Write_Str (", Code=");

            Write_Int (Int (Code));

         elsif Code = 0 then

            --  For exception case, get exception message from the TSD. Note

            --  that it would be neater and cleaner to pass the exception

            --  message (obtained from Exception_Message) as a parameter to

            --  Compiler_Abort, but we can't do this quite yet since it would

            --  cause bootstrap path problems for 3.10 to 3.11.

            Write_Char (' ');

            Write_Str (Exception_Message (Get_Current_Excep.all.all));

         end if;

         End_Line;

         --  Output source location information

         if Sloc (Current_Error_Node) <= No_Location then

            if Fallback_Loc'Length > 0 then

               Write_Str ("| Error detected around ");

               Write_Str (Fallback_Loc);

            else

               Write_Str ("| No source file position information available");

            end if;

            End_Line;

         else

            Write_Str ("| Error detected at ");

            Write_Location (Sloc (Current_Error_Node));

            End_Line;

         end if;

         --  There are two cases now. If the file gnat_bug.box exists,

         --  we use the contents of this file at this point.

         declare

            Lo  : Source_Ptr;

            Hi  : Source_Ptr;

            Src : Source_Buffer_Ptr;

         begin

            Namet.Unlock;

            Name_Buffer (1 .. 12) := "gnat_bug.box";

            Name_Len := 12;

            Read_Source_File (Name_Enter, 0, Hi, Src);

            --  If we get a Src file, we use it

            if Src /= null then

               Lo := 0;

               Outer : while Lo < Hi loop

                  Write_Str ("| ");

                  Inner : loop

                     exit Inner when Src (Lo) = ASCII.CR

                       or else Src (Lo) = ASCII.LF;

                     Write_Char (Src (Lo));

                     Lo := Lo + 1;

                  end loop Inner;

                  End_Line;

                  while Lo <= Hi

                    and then (Src (Lo) = ASCII.CR

                                or else Src (Lo) = ASCII.LF)

                  loop

                     Lo := Lo + 1;

                  end loop;

               end loop Outer;

            --  Otherwise we use the standard fixed text

            else

               if Is_FSF_Version then

                  Write_Str

                    ("| Please submit a bug report; see" &

                     " http://gcc.gnu.org/bugs.html.");

                  End_Line;

               elsif Is_GPL_Version then

                  Write_Str

                    ("| Please submit a bug report by email " &

                     "to report@adacore.com.");

                  End_Line;

                  Write_Str

                    ("| GAP members can alternatively use GNAT Tracker:");

                  End_Line;

                  Write_Str

                    ("| http://www.adacore.com/ " &

                     "section 'send a report'.");

                  End_Line;

                  Write_Str

                    ("| See gnatinfo.txt for full info on procedure " &

                     "for submitting bugs.");

                  End_Line;

               else

                  Write_Str

                    ("| Please submit a bug report using GNAT Tracker:");

                  End_Line;

                  Write_Str

                    ("| http://www.adacore.com/gnattracker/ " &

                     "section 'send a report'.");

                  End_Line;

                  Write_Str

                    ("| alternatively submit a bug report by email " &

                     "to report@adacore.com,");

                  End_Line;

                  Write_Str

                    ("| including your customer number #nnn " &

                     "in the subject line.");

                  End_Line;

               end if;

               Write_Str

                 ("| Use a subject line meaningful to you" &

                  " and us to track the bug.");

               End_Line;

               Write_Str

                 ("| Include the entire contents of this bug " &

                  "box in the report.");

               End_Line;

               Write_Str

                 ("| Include the exact gcc or gnatmake command " &

                  "that you entered.");

               End_Line;

               Write_Str

                 ("| Also include sources listed below in gnatchop format");

               End_Line;

               Write_Str

                 ("| (concatenated together with no headers between files).");

               End_Line;

               if not Is_FSF_Version then

                  Write_Str

                    ("| Use plain ASCII or MIME attachment.");

                  End_Line;

               end if;

            end if;

         end;

         --  Complete output of bug box

         Write_Char ('+');

         Repeat_Char ('=', 76, '+');

         Write_Eol;

         if Debug_Flag_3 then

            Write_Eol;

            Write_Eol;

            Print_Tree_Node (Current_Error_Node);

            Write_Eol;

         end if;

         Write_Eol;

         Write_Line ("Please include these source files with error report");

         Write_Line ("Note that list may not be accurate in some cases, ");

         Write_Line ("so please double check that the problem can still ");

         Write_Line ("be reproduced with the set of files listed.");

         Write_Line ("Consider also -gnatd.n switch (see debug.adb).");

         Write_Eol;

         begin

            Dump_Source_File_Names;

         --  If we blow up trying to print the list of file names, just output

         --  informative msg and continue.

         exception

            when others =>

               Write_Str ("list may be incomplete");

         end;

         Write_Eol;

         Set_Standard_Output;

         Tree_Dump;

         Source_Dump;

         raise Unrecoverable_Error;

      end if;

   end Compiler_Abort;

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

   -- Delete_SCIL_Files --

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

   procedure Delete_SCIL_Files is

      Main      : Node_Id;

      Unit_Name : Node_Id;

      Success : Boolean;

      pragma Unreferenced (Success);

      procedure Decode_Name_Buffer;

      --  Replace "__" by "." in Name_Buffer, and adjust Name_Len accordingly

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

      -- Decode_Name_Buffer --

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

      procedure Decode_Name_Buffer is

         J : Natural;

         K : Natural;

      begin

         J := 1;

         K := 0;

         while J <= Name_Len loop

            K := K + 1;

            if J < Name_Len

              and then Name_Buffer (J) = '_'

              and then Name_Buffer (J + 1) = '_'

            then

               Name_Buffer (K) := '.';

               J := J + 1;

            else

               Name_Buffer (K) := Name_Buffer (J);

            end if;

            J := J + 1;

         end loop;

         Name_Len := K;

      end Decode_Name_Buffer;

   --  Start of processing for Decode_Name_Buffer

   begin

      --  If parsing was not successful, no Main_Unit is available, so return

      --  immediately.

      if Main_Source_File = No_Source_File then

         return;

      end if;

      --  Retrieve unit name, and remove old versions of SCIL/<unit>.scil and

      --  SCIL/<unit>__body.scil, ditto for .scilx files.

      Main := Unit (Cunit (Main_Unit));

      case Nkind (Main) is

         when N_Subprogram_Body | N_Package_Declaration =>

            Unit_Name := Defining_Unit_Name (Specification (Main));

         when N_Package_Body =>

            Unit_Name := Corresponding_Spec (Main);

         --  Should never happen, but can be ignored in production

         when others =>

            pragma Assert (False);

            return;

      end case;

      case Nkind (Unit_Name) is

         when N_Defining_Identifier =>

            Get_Name_String (Chars (Unit_Name));

         when N_Defining_Program_Unit_Name =>

            Get_Name_String (Chars (Defining_Identifier (Unit_Name)));

            Decode_Name_Buffer;

         --  Should never happen, but can be ignored in production

         when others =>

            pragma Assert (False);

            return;

      end case;

      Delete_File

        ("SCIL/" & Name_Buffer (1 .. Name_Len) & ".scil", Success);

      Delete_File

        ("SCIL/" & Name_Buffer (1 .. Name_Len) & ".scilx", Success);

      Delete_File

        ("SCIL/" & Name_Buffer (1 .. Name_Len) & "__body.scil", Success);

      Delete_File

        ("SCIL/" & Name_Buffer (1 .. Name_Len) & "__body.scilx", Success);

   end Delete_SCIL_Files;

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

   -- Repeat_Char --

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

   procedure Repeat_Char (Char : Character; Col : Nat; After : Character) is

   begin

      while Column < Col loop

         Write_Char (Char);

      end loop;

      Write_Char (After);

   end Repeat_Char;

end Comperr;