File : a-elchha-minimal.adb
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) 2012-2014, 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 -- --
19 -- --
20 -- --
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 last chance handler for no propagation runtimes
33
34 -- It dumps the non-symbolic traceback from the point where the exception
35 -- was triggered.
36
37 with Ada.Exceptions.Traceback; use Ada.Exceptions.Traceback;
38 with Ada.Unchecked_Conversion;
39 with System.Machine_Reset;
40 with System.Traceback;
41
42 with GNAT.IO; use GNAT.IO;
43 with GNAT.Debug_Utilities; use GNAT.Debug_Utilities;
44 -- We rely on GNAT packages for the output. Usually, Ada predefined units
45 -- cannot depends on GNAT units, as the user could use the GNAT hierarchy.
46 -- However, this implementation of Last_Chance_Handler is a default one, that
47 -- could be redefined by the user.
48
49 procedure Ada.Exceptions.Last_Chance_Handler
50 (Msg : System.Address; Line : Integer)
51 is
52 procedure Put (Str : System.Address);
53 -- Put for a nul-terminated string (a C string)
54
55 ---------
56 -- Put --
57 ---------
58
59 procedure Put (Str : System.Address) is
60
61 type C_String_Ptr is access String (1 .. Positive'Last);
62 function To_C_String_Ptr is new Ada.Unchecked_Conversion
63 (System.Address, C_String_Ptr);
64
65 Msg_Str : constant C_String_Ptr := To_C_String_Ptr (Str);
66 begin
67 for J in Msg_Str'Range loop
68 exit when Msg_Str (J) = Character'Val (0);
69 Put (Msg_Str (J));
70 end loop;
71 end Put;
72
73 Traceback : Tracebacks_Array (1 .. 64);
74 Len : Natural;
75
76 begin
77 Put_Line ("In last chance handler");
78 if Line /= 0 then
79 Put ("Predefined exception raised at ");
80 Put (Msg);
81 Put (':');
82 Put (Line);
83 else
84 Put ("User defined exception, message: ");
85 Put (Msg);
86 end if;
87 New_Line;
88
89 Put_Line ("Call stack traceback locations:");
90
91 -- Dump backtrace PC values
92
93 System.Traceback.Call_Chain (Traceback, Traceback'Length, Len);
94
95 for J in 1 .. Len loop
96 Put (Image_C (Traceback (J)));
97 Put (" ");
98 end loop;
99
100 New_Line;
101
102 -- Stop the program
103 System.Machine_Reset.Stop;
104 end Ada.Exceptions.Last_Chance_Handler;