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Diffstat (limited to 'gcc-4.9/gcc/ada/a-elchha.adb')
| -rw-r--r-- | gcc-4.9/gcc/ada/a-elchha.adb | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/ada/a-elchha.adb b/gcc-4.9/gcc/ada/a-elchha.adb new file mode 100644 index 000000000..f029c3bd2 --- /dev/null +++ b/gcc-4.9/gcc/ada/a-elchha.adb @@ -0,0 +1,136 @@ +------------------------------------------------------------------------------ +-- -- +-- 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) 2003-2013, 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 Compiler_Unit_Warning; + +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; |