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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . T R A C E B A C K . S Y M B O L I C --
-- --
-- S p e c --
-- --
-- Copyright (C) 1999-2024, 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:
-- GNU/Linux x86, x86_64
-- Windows x86, x86_64
-- 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 Windows and
-- 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.
with Ada.Exceptions;
package System.Traceback.Symbolic is
pragma Elaborate_Body;
function Symbolic_Traceback
(Traceback : System.Traceback_Entries.Tracebacks_Array) return String;
function Symbolic_Traceback_No_Hex
(Traceback : System.Traceback_Entries.Tracebacks_Array) return String;
-- Build a string containing a symbolic traceback of the given call
-- chain. Note: These procedures may be installed by Set_Trace_Decorator,
-- to get a symbolic traceback on all exceptions raised (see
-- System.Exception_Traces).
function Symbolic_Traceback
(E : Ada.Exceptions.Exception_Occurrence) return String;
function Symbolic_Traceback_No_Hex
(E : Ada.Exceptions.Exception_Occurrence) return String;
-- Build string containing symbolic traceback of given exception occurrence
-- In the above, _No_Hex means do not print any hexadecimal addresses, even
-- if the symbol is not available. This is useful for getting deterministic
-- output from tests.
procedure Enable_Cache (Include_Modules : Boolean := False);
-- Read symbolic information from binary files and cache them in memory.
-- This will speed up the above functions but will require more memory. If
-- Include_Modules is true, shared modules (or DLL) will also be cached.
-- This procedure may do nothing if not supported. The profile of this
-- subprogram may change in the future (new parameters can be added
-- with default value), but backward compatibility for direct calls
-- is supported.
end System.Traceback.Symbolic;
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