------------------------------------------------------------------------------ -- -- -- 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) 1992-2023, 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 -- -- . -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- This version is for the AE653 Level A run time and for bare board targets 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; with Ada.Exceptions.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. Local_Traceback : Traceback.Tracebacks_Array (1 .. Max_Tracebacks); -- Introduce an intermediate copy of the traceback. The call to Call_Chain -- requires a parameter of type Ada.Exceptions.Traceback.Tracebacks_Array, -- and the result must be stored in an exception occurrence that has a -- component of type Ada.Exceptions.Tracebacks_Array. View conversions -- between these two types are not allowed by Ada 2005 (see RM 4.6 par. -- 24) because these types have a component of private type (Address). -- Hence we need to do explicit type conversions. -- ???This conversion should no longer be necessary. begin if Exception_Tracebacks /= 0 and then 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 Num_Tracebacks > 0 then this is -- a reraise, so we should not regenerate the traceback. -- We ask System.Traceback.Call_Chain to skip 5 frames to ensure that -- itself, ourselves and our caller and its 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 => Local_Traceback, Max_Len => Max_Tracebacks, Len => Excep.Num_Tracebacks, Exclude_Min => Code_Address_For_AAA, Exclude_Max => Code_Address_For_ZZZ, Skip_Frames => 5); -- Copy the resulting traceback to the exception occurrence Excep.Tracebacks (1 .. Excep.Num_Tracebacks) := Ada.Exceptions.Tracebacks_Array (Local_Traceback (1 .. Excep.Num_Tracebacks)); end if; end Call_Chain;