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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- G N A T . T R A C E B A C K --
-- --
-- S p e c --
-- --
-- Copyright (C) 1999-2004 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. --
-- --
------------------------------------------------------------------------------
-- Run-time non-symbolic traceback support
-- This package provides a method for generating a traceback of the
-- current execution location. The traceback shows the locations of
-- calls in the call chain, up to either the top or a designated
-- number of levels.
-- The traceback information is in the form of absolute code locations.
-- These code locations may be converted to corresponding source locations
-- using the external addr2line utility, or from within GDB.
-- In order to use this facility, in some cases the binder must be invoked
-- with -E switch (store the backtrace with exception occurence). Please
-- refer to gnatbind documentation for more information.
-- To analyze the code locations later using addr2line or gdb, the necessary
-- units must be compiled with the debugging switch -g in the usual manner.
-- Note that it is not necessary to compile with -g to use Call_Chain. In
-- other words, the following sequence of steps can be used:
-- Compile without -g
-- Run the program, and call Call_Chain
-- Recompile with -g
-- Use addr2line to interpret the absolute call locations (note that
-- addr2line expects addresses in hexadecimal format).
-- This capability is currently supported on the following targets:
-- All x86 ports
-- AiX PowerPC
-- HP-UX
-- Irix
-- Solaris sparc
-- Tru64
-- VxWorks PowerPC
-- VxWorks Alpha
with System;
with Ada.Exceptions.Traceback;
package GNAT.Traceback is
pragma Elaborate_Body;
subtype Code_Loc is System.Address;
-- Code location used in building tracebacks
subtype Tracebacks_Array is Ada.Exceptions.Traceback.Tracebacks_Array;
-- Traceback array used to hold a generated traceback list.
----------------
-- Call_Chain --
----------------
procedure Call_Chain (Traceback : out Tracebacks_Array; Len : out Natural);
-- Store up to Traceback'Length tracebacks corresponding to the current
-- call chain. The first entry stored corresponds to the deepest level
-- of subprogram calls. Len shows the number of traceback entries stored.
-- It will be equal to Traceback'Length unless the entire traceback is
-- shorter, in which case positions in Traceback past the Len position
-- are undefined on return.
end GNAT.Traceback;
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