------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- G N A T . E X C E P T I O N _ T R A C E S -- -- -- -- S p e c -- -- -- -- Copyright (C) 2000-2003 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, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, 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. -- -- -- ------------------------------------------------------------------------------ -- This package provides an interface allowing to control *automatic* output -- to standard error upon exception occurrences (as opposed to explicit -- generation of traceback information using GNAT.Traceback). -- -- This output includes the basic information associated with the exception -- (name, message) as well as a backtrace of the call chain at the point -- where the exception occurred. This backtrace is only output if the call -- chain information is available, depending if the binder switch dedicated -- to that purpose has been used or not. -- -- The default backtrace is in the form of absolute code locations which may -- be converted to corresponding source locations using the addr2line utility -- or from within GDB. Please refer to GNAT.Traceback for information about -- what is necessary to be able to exploit thisg possibility. -- -- The backtrace output can also be customized by way of a "decorator" which -- may return any string output in association with a provided call chain. with GNAT.Traceback; use GNAT.Traceback; package GNAT.Exception_Traces is -- The following defines the exact situations in which raises will -- cause automatic output of trace information. type Trace_Kind is (Every_Raise, -- Denotes the initial raise event for any exception occurrence, either -- explicit or due to a specific language rule, within the context of a -- task or not. Unhandled_Raise -- Denotes the raise events corresponding to exceptions for which there -- is no user defined handler, in particular, when a task dies due to an -- unhandled exception. ); -- The following procedures can be used to activate and deactivate -- traces identified by the above trace kind values. procedure Trace_On (Kind : Trace_Kind); -- Activate the traces denoted by Kind. procedure Trace_Off; -- Stop the tracing requested by the last call to Trace_On. -- Has no effect if no such call has ever occurred. -- The following provide the backtrace decorating facilities type Traceback_Decorator is access function (Traceback : Tracebacks_Array) return String; -- A backtrace decorator is a function which returns the string to be -- output for a call chain provided by way of a tracebacks array. procedure Set_Trace_Decorator (Decorator : Traceback_Decorator); -- Set the decorator to be used for future automatic outputs. Restore -- the default behavior (output of raw addresses) if the provided -- access value is null. end GNAT.Exception_Traces;