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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) 1999-2008, 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 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, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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 occurrence). 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:
+
+-- AiX PowerPC
+-- HP-UX
+-- GNU/Linux x86
+-- Irix MIPS
+-- LynxOS x86
+-- Solaris x86
+-- Solaris sparc
+-- Tru64 alpha
+-- OpenVMS/Alpha
+-- OpenVMS/ia64
+-- VxWorks PowerPC
+-- VxWorks x86
+-- Windows NT/XP
+
+-- Note: see also GNAT.Traceback.Symbolic, a child unit in file g-trasym.ads
+-- providing symbolic trace back capability for a subset of the above targets.
+
+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;