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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

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

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          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 is the default version of this package

--  Note: this unit must be compiled using -fno-optimize-sibling-calls.

--  See comment below in body of Call_Chain for details on the reason.

pragma Compiler_Unit;

package body System.Traceback is

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

   -- C_Call_Chain --

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

   function C_Call_Chain

     (Traceback : System.Address;

      Max_Len   : Natural)

      return      Natural

   is

      Val : Natural;

   begin

      Call_Chain (Traceback, Max_Len, Val);

      return Val;

   end C_Call_Chain;

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

   -- Call_Chain --

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

   function Backtrace

     (Traceback   : System.Address;

      Len         : Integer;

      Exclude_Min : System.Address;

      Exclude_Max : System.Address;

      Skip_Frames : Integer)

      return        Integer;

   pragma Import (C, Backtrace, "__gnat_backtrace");

   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)

   is

   begin

      --  Note: Backtrace relies on the following call actually creating a

      --  stack frame. To ensure that this is the case, it is essential to

      --  compile this unit without sibling call optimization.

      --  We want the underlying engine to skip its own frame plus the

      --  ones we have been requested to skip ourselves.

      Len := Backtrace (Traceback   => Traceback,

                        Len         => Max_Len,

                        Exclude_Min => Exclude_Min,

                        Exclude_Max => Exclude_Max,

                        Skip_Frames => Skip_Frames + 1);

   end Call_Chain;

end System.Traceback;