142 lines
6.2 KiB
Ada
142 lines
6.2 KiB
Ada
------------------------------------------------------------------------------
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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) 2003-2014, 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 Compiler_Unit_Warning;
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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;
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Info : in out String;
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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_Untailored_Exception_Information
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(X : Exception_Occurrence;
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Info : in out String;
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Ptr : in out Natural);
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pragma Import
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(Ada, Append_Info_Untailored_Exception_Information,
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"__gnat_append_info_u_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_Untailored_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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