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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) 2003-2024, 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 --
-- <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
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;
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