1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME COMPONENTS -- 4-- -- 5-- 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 -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 2003-2009, Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNAT was originally developed by the GNAT team at New York University. -- 28-- Extensive contributions were provided by Ada Core Technologies Inc. -- 29-- -- 30------------------------------------------------------------------------------ 31 32-- Default version for most targets 33 34pragma Warnings (Off); 35pragma Compiler_Unit; 36pragma Warnings (On); 37 38with System.Standard_Library; use System.Standard_Library; 39with System.Soft_Links; 40 41procedure Ada.Exceptions.Last_Chance_Handler 42 (Except : Exception_Occurrence) 43is 44 procedure Unhandled_Terminate; 45 pragma No_Return (Unhandled_Terminate); 46 pragma Import (C, Unhandled_Terminate, "__gnat_unhandled_terminate"); 47 -- Perform system dependent shutdown code 48 49 function Exception_Message_Length 50 (X : Exception_Occurrence) return Natural; 51 pragma Import (Ada, Exception_Message_Length, "__gnat_exception_msg_len"); 52 53 procedure Append_Info_Exception_Message 54 (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural); 55 pragma Import 56 (Ada, Append_Info_Exception_Message, "__gnat_append_info_e_msg"); 57 58 procedure Append_Info_Exception_Information 59 (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural); 60 pragma Import 61 (Ada, Append_Info_Exception_Information, "__gnat_append_info_e_info"); 62 63 procedure To_Stderr (S : String); 64 pragma Import (Ada, To_Stderr, "__gnat_to_stderr"); 65 -- Little routine to output string to stderr 66 67 Ptr : Natural := 0; 68 Nobuf : String (1 .. 0); 69 70 Nline : constant String := String'(1 => ASCII.LF); 71 -- Convenient shortcut 72 73begin 74 -- Do not execute any task termination code when shutting down the system. 75 -- The Adafinal procedure would execute the task termination routine for 76 -- normal termination, but we have already executed the task termination 77 -- procedure because of an unhandled exception. 78 79 System.Soft_Links.Task_Termination_Handler := 80 System.Soft_Links.Task_Termination_NT'Access; 81 82 -- We shutdown the runtime now. The rest of the procedure needs to be 83 -- careful not to use anything that would require runtime support. In 84 -- particular, functions returning strings are banned since the sec stack 85 -- is no longer functional. This is particularly important to note for the 86 -- Exception_Information output. We used to allow the tailored version to 87 -- show up here, which turned out to be a bad idea as it might involve a 88 -- traceback decorator the length of which we don't control. Potentially 89 -- heavy primary/secondary stack use or dynamic allocations right before 90 -- this point are not welcome, moving the output before the finalization 91 -- raises order of outputs concerns, and decorators are intended to only 92 -- be used with exception traces, which should have been issued already. 93 94 System.Standard_Library.Adafinal; 95 96 -- Print a message only when exception traces are not active 97 98 if Exception_Trace /= RM_Convention then 99 null; 100 101 -- Check for special case of raising _ABORT_SIGNAL, which is not 102 -- really an exception at all. We recognize this by the fact that 103 -- it is the only exception whose name starts with underscore. 104 105 elsif To_Ptr (Except.Id.Full_Name) (1) = '_' then 106 To_Stderr (Nline); 107 To_Stderr ("Execution terminated by abort of environment task"); 108 To_Stderr (Nline); 109 110 -- If no tracebacks, we print the unhandled exception in the old style 111 -- (i.e. the style used before ZCX was implemented). We do this to 112 -- retain compatibility. 113 114 elsif Except.Num_Tracebacks = 0 then 115 To_Stderr (Nline); 116 To_Stderr ("raised "); 117 To_Stderr 118 (To_Ptr (Except.Id.Full_Name) (1 .. Except.Id.Name_Length - 1)); 119 120 if Exception_Message_Length (Except) /= 0 then 121 To_Stderr (" : "); 122 Append_Info_Exception_Message (Except, Nobuf, Ptr); 123 end if; 124 125 To_Stderr (Nline); 126 127 -- Traceback exists 128 129 else 130 To_Stderr (Nline); 131 To_Stderr ("Execution terminated by unhandled exception"); 132 To_Stderr (Nline); 133 134 Append_Info_Exception_Information (Except, Nobuf, Ptr); 135 end if; 136 137 Unhandled_Terminate; 138end Ada.Exceptions.Last_Chance_Handler; 139