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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) 1999-2010, 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 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 version uses System.Machine_State_Operations routines

with System.Machine_State_Operations;

package body System.Traceback is

   use System.Machine_State_Operations;

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

   -- 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)

   is

      type Tracebacks_Array is array (1 .. Max_Len) of Code_Loc;

      pragma Suppress_Initialization (Tracebacks_Array);

      M     : Machine_State;

      Code  : Code_Loc;

      Trace : Tracebacks_Array;

      for Trace'Address use Traceback;

      N_Skips  : Natural := 0;

   begin

      M := Allocate_Machine_State;

      Set_Machine_State (M);

      --  Skip the requested number of frames

      loop

         Code := Get_Code_Loc (M);

         exit when Code = Null_Address or else N_Skips = Skip_Frames;

         Pop_Frame (M);

         N_Skips := N_Skips + 1;

      end loop;

      --  Now, record the frames outside the exclusion bounds, updating

      --  the Len output value along the way.

      Len := 0;

      loop

         Code := Get_Code_Loc (M);

         exit when Code = Null_Address or else Len = Max_Len;

         if Code < Exclude_Min or else Code > Exclude_Max then

            Len := Len + 1;

            Trace (Len) := Code;

         end if;

         Pop_Frame (M);

      end loop;

      Free_Machine_State (M);

   end Call_Chain;

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

   -- 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;

end System.Traceback;