1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
------------------------------------------------------------------------------
-- --
-- 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) 2003-2005, Free Software Foundation, Inc. --
-- --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT. The copyright notice above, and the license provisions that follow --
-- apply solely to the contents of the part following the private keyword. --
-- --
-- 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- 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;
-- Used for Adafinal
with System.Soft_Links;
-- Used for Task_Termination_Handler
-- Task_Termination_NT
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;
-- Let's 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;
-- 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.
if 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;
|
