1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--             A D A . E X C E P T I O N S . C A L L _ C H A I N            --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2013, 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
32pragma Warnings (Off);
33--  Allow withing of non-Preelaborated units in Ada 2005 mode where this
34--  package will be categorized as Preelaborate. See AI-362 for details.
35--  It is safe in the context of the run-time to violate the rules.
36
37with System.Traceback;
38
39pragma Warnings (On);
40
41separate (Ada.Exceptions)
42procedure Call_Chain (Excep : EOA) is
43
44   Exception_Tracebacks : Integer;
45   pragma Import (C, Exception_Tracebacks, "__gl_exception_tracebacks");
46   --  Boolean indicating whether tracebacks should be stored in exception
47   --  occurrences.
48
49begin
50   if Exception_Tracebacks /= 0 and Excep.Num_Tracebacks = 0 then
51
52      --  If Exception_Tracebacks = 0 then the program was not
53      --  compiled for storing tracebacks in exception occurrences
54      --  (-bargs -E switch) so that we do not generate them.
55      --
56      --  If Excep.Num_Tracebacks /= 0 then this is a reraise, no need
57      --  to store a new (wrong) chain.
58
59      --  We ask System.Traceback.Call_Chain to skip 3 frames to ensure that
60      --  itself, ourselves and our caller are not part of the result. Our
61      --  caller is always an exception propagation actor that we don't want
62      --  to see, and it may be part of a separate subunit which pulls it
63      --  outside the AAA/ZZZ range.
64
65      System.Traceback.Call_Chain
66        (Traceback   => Excep.Tracebacks'Address,
67         Max_Len     => Max_Tracebacks,
68         Len         => Excep.Num_Tracebacks,
69         Exclude_Min => Code_Address_For_AAA,
70         Exclude_Max => Code_Address_For_ZZZ,
71         Skip_Frames => 3);
72   end if;
73
74end Call_Chain;
75