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
|
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- G N A T . E X C E P T I O N _ T R A C E S --
-- --
-- B o d y --
-- --
-- Copyright (C) 2000-2002 Ada Core Technologies, 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 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. --
-- --
------------------------------------------------------------------------------
with System.Standard_Library; use System.Standard_Library;
with System.Soft_Links; use System.Soft_Links;
package body GNAT.Exception_Traces is
-- Calling the decorator directly from where it is needed would require
-- introducing nasty dependencies upon the spec of this package (typically
-- in a-except.adb). We also have to deal with the fact that the traceback
-- array within an exception occurrence and the one the decorator shall
-- accept are of different types. These are two reasons for which a wrapper
-- with a System.Address argument is indeed used to call the decorator
-- provided by the user of this package. This wrapper is called via a
-- soft-link, which either is null when no decorator is in place or "points
-- to" the following function otherwise.
function Decorator_Wrapper
(Traceback : System.Address;
Len : Natural)
return String;
-- The wrapper to be called when a decorator is in place for exception
-- backtraces.
--
-- Traceback is the address of the call chain array as stored in the
-- exception occurrence and Len is the number of significant addresses
-- contained in this array.
Current_Decorator : Traceback_Decorator := null;
-- The decorator to be called by the wrapper when it is not null, as set
-- by Set_Trace_Decorator. When this access is null, the wrapper is null
-- also and shall then not be called.
-----------------------
-- Decorator_Wrapper --
-----------------------
function Decorator_Wrapper
(Traceback : System.Address;
Len : Natural)
return String
is
Decorator_Traceback : Tracebacks_Array (1 .. Len);
for Decorator_Traceback'Address use Traceback;
-- Handle the "transition" from the array stored in the exception
-- occurrence to the array expected by the decorator.
pragma Import (Ada, Decorator_Traceback);
begin
return Current_Decorator.all (Decorator_Traceback);
end Decorator_Wrapper;
-------------------------
-- Set_Trace_Decorator --
-------------------------
procedure Set_Trace_Decorator (Decorator : Traceback_Decorator) is
begin
Current_Decorator := Decorator;
if Current_Decorator /= null then
Traceback_Decorator_Wrapper := Decorator_Wrapper'Access;
else
Traceback_Decorator_Wrapper := null;
end if;
end Set_Trace_Decorator;
-- Trace_On/Trace_Off control the kind of automatic output to occur
-- by way of the global Exception_Trace variable.
---------------
-- Trace_Off --
---------------
procedure Trace_Off is
begin
Exception_Trace := RM_Convention;
end Trace_Off;
--------------
-- Trace_On --
--------------
procedure Trace_On (Kind : Trace_Kind) is
begin
case Kind is
when Every_Raise =>
Exception_Trace := Every_Raise;
when Unhandled_Raise =>
Exception_Trace := Unhandled_Raise;
end case;
end Trace_On;
end GNAT.Exception_Traces;
|
