File : a-excach.adb
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- A D A . E X C E P T I O N S . C A L L _ C H A I N --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2009, Free Software Foundation, 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 3, 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. --
-- --
-- --
-- --
-- --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
pragma Warnings (Off);
-- Allow withing of non-Preelaborated units in Ada 2005 mode where this
-- package will be categorized as Preelaborate. See AI-362 for details.
-- It is safe in the context of the run-time to violate the rules!
with System.Traceback;
pragma Warnings (On);
separate (Ada.Exceptions)
procedure Call_Chain (Excep : EOA) is
Exception_Tracebacks : Integer;
pragma Import (C, Exception_Tracebacks, "__gl_exception_tracebacks");
-- Boolean indicating whether tracebacks should be stored in exception
-- occurrences.
begin
if Exception_Tracebacks /= 0 and Excep.Num_Tracebacks = 0 then
-- If Exception_Tracebacks = 0 then the program was not
-- compiled for storing tracebacks in exception occurrences
-- (-bargs -E switch) so that we do not generate them.
--
-- If Excep.Num_Tracebacks /= 0 then this is a reraise, no need
-- to store a new (wrong) chain.
-- We ask System.Traceback.Call_Chain to skip 3 frames to ensure that
-- itself, ourselves and our caller are not part of the result. Our
-- caller is always an exception propagation actor that we don't want
-- to see, and it may be part of a separate subunit which pulls it
-- outside the AAA/ZZZ range.
System.Traceback.Call_Chain
(Traceback => Excep.Tracebacks'Address,
Max_Len => Max_Tracebacks,
Len => Excep.Num_Tracebacks,
Exclude_Min => Code_Address_For_AAA,
Exclude_Max => Code_Address_For_ZZZ,
Skip_Frames => 3);
end if;
end Call_Chain;