Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/a-elchha.adb @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
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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) 2003-2017, 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 | |
34 pragma Compiler_Unit_Warning; | |
35 | |
36 with System.Standard_Library; use System.Standard_Library; | |
37 with System.Soft_Links; | |
38 | |
39 procedure Ada.Exceptions.Last_Chance_Handler | |
40 (Except : Exception_Occurrence) | |
41 is | |
42 procedure Unhandled_Terminate; | |
43 pragma No_Return (Unhandled_Terminate); | |
44 pragma Import (C, Unhandled_Terminate, "__gnat_unhandled_terminate"); | |
45 -- Perform system dependent shutdown code | |
46 | |
47 function Exception_Message_Length | |
48 (X : Exception_Occurrence) return Natural; | |
49 pragma Import (Ada, Exception_Message_Length, "__gnat_exception_msg_len"); | |
50 | |
51 procedure Append_Info_Exception_Message | |
52 (X : Exception_Occurrence; | |
53 Info : in out String; | |
54 Ptr : in out Natural); | |
55 pragma Import | |
56 (Ada, Append_Info_Exception_Message, "__gnat_append_info_e_msg"); | |
57 | |
58 procedure Append_Info_Untailored_Exception_Information | |
59 (X : Exception_Occurrence; | |
60 Info : in out String; | |
61 Ptr : in out Natural); | |
62 pragma Import | |
63 (Ada, Append_Info_Untailored_Exception_Information, | |
64 "__gnat_append_info_u_e_info"); | |
65 | |
66 procedure To_Stderr (S : String); | |
67 pragma Import (Ada, To_Stderr, "__gnat_to_stderr"); | |
68 -- Little routine to output string to stderr | |
69 | |
70 Ptr : Natural := 0; | |
71 Nobuf : String (1 .. 0); | |
72 | |
73 Nline : constant String := String'(1 => ASCII.LF); | |
74 -- Convenient shortcut | |
75 | |
76 begin | |
77 -- Do not execute any task termination code when shutting down the system. | |
78 -- The Adafinal procedure would execute the task termination routine for | |
79 -- normal termination, but we have already executed the task termination | |
80 -- procedure because of an unhandled exception. | |
81 | |
82 System.Soft_Links.Task_Termination_Handler := | |
83 System.Soft_Links.Task_Termination_NT'Access; | |
84 | |
85 -- We shutdown the runtime now. The rest of the procedure needs to be | |
86 -- careful not to use anything that would require runtime support. In | |
87 -- particular, functions returning strings are banned since the sec stack | |
88 -- is no longer functional. This is particularly important to note for the | |
89 -- Exception_Information output. We used to allow the tailored version to | |
90 -- show up here, which turned out to be a bad idea as it might involve a | |
91 -- traceback decorator the length of which we don't control. Potentially | |
92 -- heavy primary/secondary stack use or dynamic allocations right before | |
93 -- this point are not welcome, moving the output before the finalization | |
94 -- raises order of outputs concerns, and decorators are intended to only | |
95 -- be used with exception traces, which should have been issued already. | |
96 | |
97 System.Standard_Library.Adafinal; | |
98 | |
99 -- Print a message only when exception traces are not active | |
100 | |
101 if Exception_Trace /= RM_Convention then | |
102 null; | |
103 | |
104 -- Check for special case of raising _ABORT_SIGNAL, which is not | |
105 -- really an exception at all. We recognize this by the fact that | |
106 -- it is the only exception whose name starts with underscore. | |
107 | |
108 elsif To_Ptr (Except.Id.Full_Name) (1) = '_' then | |
109 To_Stderr (Nline); | |
110 To_Stderr ("Execution terminated by abort of environment task"); | |
111 To_Stderr (Nline); | |
112 | |
113 -- If no tracebacks, we print the unhandled exception in the old style | |
114 -- (i.e. the style used before ZCX was implemented). We do this to | |
115 -- retain compatibility. | |
116 | |
117 elsif Except.Num_Tracebacks = 0 then | |
118 To_Stderr (Nline); | |
119 To_Stderr ("raised "); | |
120 To_Stderr | |
121 (To_Ptr (Except.Id.Full_Name) (1 .. Except.Id.Name_Length - 1)); | |
122 | |
123 if Exception_Message_Length (Except) /= 0 then | |
124 To_Stderr (" : "); | |
125 Append_Info_Exception_Message (Except, Nobuf, Ptr); | |
126 end if; | |
127 | |
128 To_Stderr (Nline); | |
129 | |
130 -- Traceback exists | |
131 | |
132 else | |
133 To_Stderr (Nline); | |
134 To_Stderr ("Execution terminated by unhandled exception"); | |
135 To_Stderr (Nline); | |
136 | |
137 Append_Info_Untailored_Exception_Information (Except, Nobuf, Ptr); | |
138 end if; | |
139 | |
140 Unhandled_Terminate; | |
141 end Ada.Exceptions.Last_Chance_Handler; |