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+------------------------------------------------------------------------------
+-- --
+-- 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. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- 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;