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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--                  G N A T . E X C E P T I O N _ T R A C E S               --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--                     Copyright (C) 2000-2010, AdaCore                     --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This package provides an interface allowing to control *automatic* output
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--  to standard error upon exception occurrences (as opposed to explicit
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--  generation of traceback information using GNAT.Traceback).
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--  This output includes the basic information associated with the exception
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--  (name, message) as well as a backtrace of the call chain at the point
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--  where the exception occurred. This backtrace is only output if the call
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--  chain information is available, depending if the binder switch dedicated
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--  to that purpose has been used or not.
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--  The default backtrace is in the form of absolute code locations which may
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--  be converted to corresponding source locations using the addr2line utility
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--  or from within GDB. Please refer to GNAT.Traceback for information about
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--  what is necessary to be able to exploit this possibility.
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--  The backtrace output can also be customized by way of a "decorator" which
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--  may return any string output in association with a provided call chain.
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--  The decorator replaces the default backtrace mentioned above.
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with GNAT.Traceback; use GNAT.Traceback;
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package GNAT.Exception_Traces is
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   --  The following defines the exact situations in which raises will
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   --  cause automatic output of trace information.
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   type Trace_Kind is
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     (Every_Raise,
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      --  Denotes the initial raise event for any exception occurrence, either
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      --  explicit or due to a specific language rule, within the context of a
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      --  task or not.
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      Unhandled_Raise
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      --  Denotes the raise events corresponding to exceptions for which there
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      --  is no user defined handler, in particular, when a task dies due to an
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      --  unhandled exception.
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     );
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   --  The following procedures can be used to activate and deactivate
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   --  traces identified by the above trace kind values.
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   procedure Trace_On (Kind : Trace_Kind);
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   --  Activate the traces denoted by Kind
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   procedure Trace_Off;
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   --  Stop the tracing requested by the last call to Trace_On.
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   --  Has no effect if no such call has ever occurred.
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   --  The following provide the backtrace decorating facilities
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   type Traceback_Decorator is access
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     function (Traceback : Tracebacks_Array) return String;
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   --  A backtrace decorator is a function which returns the string to be
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   --  output for a call chain provided by way of a tracebacks array.
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   procedure Set_Trace_Decorator (Decorator : Traceback_Decorator);
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   --  Set the decorator to be used for future automatic outputs. Restore
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   --  the default behavior (output of raw addresses) if the provided
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   --  access value is null.
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   --
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   --  Note: GNAT.Traceback.Symbolic.Symbolic_Traceback may be used as the
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   --  Decorator, to get a symbolic traceback. This will cause a significant
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   --  cpu and memory overhead.
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end GNAT.Exception_Traces;

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