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

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--    A D A . E X C E P T I O N S . L A S T _ C H A N C E _ H A N D L E R   --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 2003-2009, 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.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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

--  Default version for most targets

pragma Warnings (Off);

pragma Compiler_Unit;

pragma Warnings (On);

with System.Standard_Library; use System.Standard_Library;

with System.Soft_Links;

procedure Ada.Exceptions.Last_Chance_Handler

  (Except : Exception_Occurrence)

is

   procedure Unhandled_Terminate;

   pragma No_Return (Unhandled_Terminate);

   pragma Import (C, Unhandled_Terminate, "__gnat_unhandled_terminate");

   --  Perform system dependent shutdown code

   function Exception_Message_Length

     (X : Exception_Occurrence) return Natural;

   pragma Import (Ada, Exception_Message_Length, "__gnat_exception_msg_len");

   procedure Append_Info_Exception_Message

     (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural);

   pragma Import

     (Ada, Append_Info_Exception_Message, "__gnat_append_info_e_msg");

   procedure Append_Info_Exception_Information

     (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural);

   pragma Import

     (Ada, Append_Info_Exception_Information, "__gnat_append_info_e_info");

   procedure To_Stderr (S : String);

   pragma Import (Ada, To_Stderr, "__gnat_to_stderr");

   --  Little routine to output string to stderr

   Ptr   : Natural := 0;

   Nobuf : String (1 .. 0);

   Nline : constant String := String'(1 => ASCII.LF);

   --  Convenient shortcut

begin

   --  Do not execute any task termination code when shutting down the system.

   --  The Adafinal procedure would execute the task termination routine for

   --  normal termination, but we have already executed the task termination

   --  procedure because of an unhandled exception.

   System.Soft_Links.Task_Termination_Handler :=

     System.Soft_Links.Task_Termination_NT'Access;

   --  We shutdown the runtime now. The rest of the procedure needs to be

   --  careful not to use anything that would require runtime support. In

   --  particular, functions returning strings are banned since the sec stack

   --  is no longer functional. This is particularly important to note for the

   --  Exception_Information output. We used to allow the tailored version to

   --  show up here, which turned out to be a bad idea as it might involve a

   --  traceback decorator the length of which we don't control. Potentially

   --  heavy primary/secondary stack use or dynamic allocations right before

   --  this point are not welcome, moving the output before the finalization

   --  raises order of outputs concerns, and decorators are intended to only

   --  be used with exception traces, which should have been issued already.

   System.Standard_Library.Adafinal;

   --  Print a message only when exception traces are not active

   if Exception_Trace /= RM_Convention then

      null;

   --  Check for special case of raising _ABORT_SIGNAL, which is not

   --  really an exception at all. We recognize this by the fact that

   --  it is the only exception whose name starts with underscore.

   elsif To_Ptr (Except.Id.Full_Name) (1) = '_' then

      To_Stderr (Nline);

      To_Stderr ("Execution terminated by abort of environment task");

      To_Stderr (Nline);

   --  If no tracebacks, we print the unhandled exception in the old style

   --  (i.e. the style used before ZCX was implemented). We do this to

   --  retain compatibility.

   elsif Except.Num_Tracebacks = 0 then

      To_Stderr (Nline);

      To_Stderr ("raised ");

      To_Stderr

        (To_Ptr (Except.Id.Full_Name) (1 .. Except.Id.Name_Length - 1));

      if Exception_Message_Length (Except) /= 0 then

         To_Stderr (" : ");

         Append_Info_Exception_Message (Except, Nobuf, Ptr);

      end if;

      To_Stderr (Nline);

   --  Traceback exists

   else

      To_Stderr (Nline);

      To_Stderr ("Execution terminated by unhandled exception");

      To_Stderr (Nline);

      Append_Info_Exception_Information (Except, Nobuf, Ptr);

   end if;

   Unhandled_Terminate;

end Ada.Exceptions.Last_Chance_Handler;