------------------------------------------------------------------------------ -- -- -- 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) 2003-2024, 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 -- -- . -- -- -- -- 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 with System.Standard_Library; use System.Standard_Library; with System.Soft_Links; use System; 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_Untailored_Exception_Information (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural); pragma Import (Ada, Append_Info_Untailored_Exception_Information, "__gnat_append_info_u_e_info"); procedure To_Stderr (S : String); pragma Import (Ada, To_Stderr, "__gnat_to_stderr"); -- Little routine to output string to stderr Gnat_Argv : System.Address; pragma Import (C, Gnat_Argv, "gnat_argv"); procedure Fill_Arg (A : System.Address; Arg_Num : Integer); pragma Import (C, Fill_Arg, "__gnat_fill_arg"); function Len_Arg (Arg_Num : Integer) return Integer; pragma Import (C, Len_Arg, "__gnat_len_arg"); 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); if Gnat_Argv = System.Null_Address then To_Stderr ("Execution terminated by unhandled exception"); else declare Arg : aliased String (1 .. Len_Arg (0)); begin Fill_Arg (Arg'Address, 0); To_Stderr ("Execution of "); To_Stderr (Arg); To_Stderr (" terminated by unhandled exception"); end; end if; To_Stderr (Nline); Append_Info_Untailored_Exception_Information (Except, Nobuf, Ptr); end if; Unhandled_Terminate; end Ada.Exceptions.Last_Chance_Handler;