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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                     S Y S T E M . T R A C E B A C K                      --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1999-2009, Free Software Foundation, 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 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.      --

--                                                                          --

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

--  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.

pragma Compiler_Unit;

pragma Polling (Off);

--  We must turn polling off for this unit, because otherwise we get

--  elaboration circularities with System.Exception_Tables.

package System.Traceback is

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

   -- Call_Chain --

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

   procedure Call_Chain

     (Traceback   : System.Address;

      Max_Len     : Natural;

      Len         : out Natural;

      Exclude_Min : System.Address := System.Null_Address;

      Exclude_Max : System.Address := System.Null_Address;

      Skip_Frames : Natural := 1);

   --  Store up to Max_Len code locations in Traceback, corresponding to

   --  the current call chain.

   --

   --    Traceback is the address of an array of addresses where the

   --    result will be stored.

   --

   --    Max_Len is the length of the Traceback array. If the call chain is

   --    longer than this, then additional entries are discarded, and the

   --    traceback is missing some of the highest level entries.

   --

   --    Len is the returned number of addresses stored in the Traceback array

   --

   --    Exclude_Min/Exclude_Max, if non null, provide a range of addresses

   --    to ignore from the computation of the traceback.

   --

   --    Skip_Frames says how many of the most recent calls should at least

   --    be excluded from the result, regardless of the exclusion bounds and

   --    starting with this procedure itself: 1 means exclude the frame for

   --    this procedure, 2 means 1 + exclude the frame for this procedure's

   --    caller, ...

   --

   --  On return, the Traceback array is filled in, and Len indicates the

   --  number of stored entries. The first entry is the most recent call,

   --  and the last entry is the highest level call.

   function C_Call_Chain

     (Traceback : System.Address;

      Max_Len   : Natural)

      return      Natural;

   pragma Export (C, C_Call_Chain, "system__traceback__c_call_chain");

   --  Version that can be used directly from C

end System.Traceback;