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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--    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   --
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--                                                                          --
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--                                 B o d y                                  --
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--                                                                          --
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--          Copyright (C) 2003-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  Default version for most targets
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pragma Warnings (Off);
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pragma Compiler_Unit;
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pragma Warnings (On);
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with System.Standard_Library; use System.Standard_Library;
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with System.Soft_Links;
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procedure Ada.Exceptions.Last_Chance_Handler
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  (Except : Exception_Occurrence)
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is
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   procedure Unhandled_Terminate;
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   pragma No_Return (Unhandled_Terminate);
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   pragma Import (C, Unhandled_Terminate, "__gnat_unhandled_terminate");
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   --  Perform system dependent shutdown code
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   function Exception_Message_Length
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     (X : Exception_Occurrence) return Natural;
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   pragma Import (Ada, Exception_Message_Length, "__gnat_exception_msg_len");
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   procedure Append_Info_Exception_Message
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     (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural);
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   pragma Import
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     (Ada, Append_Info_Exception_Message, "__gnat_append_info_e_msg");
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   procedure Append_Info_Exception_Information
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     (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural);
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   pragma Import
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     (Ada, Append_Info_Exception_Information, "__gnat_append_info_e_info");
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   procedure To_Stderr (S : String);
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   pragma Import (Ada, To_Stderr, "__gnat_to_stderr");
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   --  Little routine to output string to stderr
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   Ptr   : Natural := 0;
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   Nobuf : String (1 .. 0);
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   Nline : constant String := String'(1 => ASCII.LF);
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   --  Convenient shortcut
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begin
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   --  Do not execute any task termination code when shutting down the system.
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   --  The Adafinal procedure would execute the task termination routine for
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   --  normal termination, but we have already executed the task termination
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   --  procedure because of an unhandled exception.
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   System.Soft_Links.Task_Termination_Handler :=
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     System.Soft_Links.Task_Termination_NT'Access;
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   --  We shutdown the runtime now. The rest of the procedure needs to be
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   --  careful not to use anything that would require runtime support. In
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   --  particular, functions returning strings are banned since the sec stack
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   --  is no longer functional. This is particularly important to note for the
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   --  Exception_Information output. We used to allow the tailored version to
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   --  show up here, which turned out to be a bad idea as it might involve a
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   --  traceback decorator the length of which we don't control. Potentially
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   --  heavy primary/secondary stack use or dynamic allocations right before
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   --  this point are not welcome, moving the output before the finalization
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   --  raises order of outputs concerns, and decorators are intended to only
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   --  be used with exception traces, which should have been issued already.
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   System.Standard_Library.Adafinal;
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   --  Print a message only when exception traces are not active
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   if Exception_Trace /= RM_Convention then
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      null;
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   --  Check for special case of raising _ABORT_SIGNAL, which is not
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   --  really an exception at all. We recognize this by the fact that
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   --  it is the only exception whose name starts with underscore.
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   elsif To_Ptr (Except.Id.Full_Name) (1) = '_' then
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      To_Stderr (Nline);
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      To_Stderr ("Execution terminated by abort of environment task");
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      To_Stderr (Nline);
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   --  If no tracebacks, we print the unhandled exception in the old style
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   --  (i.e. the style used before ZCX was implemented). We do this to
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   --  retain compatibility.
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   elsif Except.Num_Tracebacks = 0 then
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      To_Stderr (Nline);
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      To_Stderr ("raised ");
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      To_Stderr
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        (To_Ptr (Except.Id.Full_Name) (1 .. Except.Id.Name_Length - 1));
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      if Exception_Message_Length (Except) /= 0 then
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         To_Stderr (" : ");
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         Append_Info_Exception_Message (Except, Nobuf, Ptr);
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      end if;
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      To_Stderr (Nline);
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   --  Traceback exists
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   else
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      To_Stderr (Nline);
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      To_Stderr ("Execution terminated by unhandled exception");
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      To_Stderr (Nline);
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      Append_Info_Exception_Information (Except, Nobuf, Ptr);
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   end if;
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   Unhandled_Terminate;
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end Ada.Exceptions.Last_Chance_Handler;

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