Subversion Repositories openrisc

------------------------------------------------------------------------------

--                                                                          --

--                         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;