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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- G N A T . T R A C E B A C K . S Y M B O L I C --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1999-2012, AdaCore --
+-- --
+-- 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. --
+-- --
+------------------------------------------------------------------------------
+
+-- Run-time symbolic traceback support
+
+-- The full capability is currently supported on the following targets:
+
+-- HP-UX ia64
+-- GNU/Linux x86, x86_64, ia64
+-- FreeBSD x86, x86_64
+-- Solaris sparc and x86
+-- OpenVMS Alpha and ia64
+-- Windows
+
+-- Note: on targets other than those listed above, a dummy implementation of
+-- the body returns a series of LF separated strings of the form "0x..."
+-- corresponding to the addresses.
+
+-- The routines provided in this package assume that your application has
+-- been compiled with debugging information turned on, since this information
+-- is used to build a symbolic traceback.
+
+-- If you want to retrieve tracebacks from exception occurrences, it is also
+-- necessary to invoke the binder with -E switch. Please refer to the gnatbind
+-- documentation for more information.
+
+-- Note that it is also possible (and often recommended) to compute symbolic
+-- traceback outside the program execution, which in addition allows you
+-- to distribute the executable with no debug info:
+--
+-- - build your executable with debug info
+-- - archive this executable
+-- - strip a copy of the executable and distribute/deploy this version
+-- - at run time, compute absolute traceback (-bargs -E) from your
+-- executable and log it using Ada.Exceptions.Exception_Information
+-- - off line, compute the symbolic traceback using the executable archived
+-- with debug info and addr2line or gdb (using info line *<addr>) on the
+-- absolute addresses logged by your application.
+
+-- In order to retrieve symbolic information, functions in this package will
+-- read on disk all the debug information of the executable file (found via
+-- Argument (0), and looked in the PATH if needed) or shared libraries using
+-- OS facilities, and load them in memory, causing a significant cpu and
+-- memory overhead.
+
+-- Symbolic traceback from shared libraries is only supported for VMS, Windows
+-- and GNU/Linux. On other targets symbolic tracebacks are only supported for
+-- the main executable. You should consider using gdb to obtain symbolic
+-- traceback in such cases.
+
+-- On VMS, there is no restriction on using this facility with shared
+-- libraries. However, the OS should be at least v7.3-1 and OS patch
+-- VMS731_TRACE-V0100 must be applied in order to use this package.
+
+-- On platforms where the full capability is not supported, function
+-- Symbolic_Traceback return a list of addresses expressed as "0x..."
+-- separated by line feed.
+
+with Ada.Exceptions; use Ada.Exceptions;
+
+package GNAT.Traceback.Symbolic is
+ pragma Elaborate_Body;
+
+ function Symbolic_Traceback (Traceback : Tracebacks_Array) return String;
+ -- Build a string containing a symbolic traceback of the given call chain.
+ -- Note: This procedure may be installed by Set_Trace_Decorator, to get a
+ -- symbolic traceback on all exceptions raised (see GNAT.Exception_Traces).
+
+ function Symbolic_Traceback (E : Exception_Occurrence) return String;
+ -- Build string containing symbolic traceback of given exception occurrence
+
+end GNAT.Traceback.Symbolic;