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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [s-traceb-mastop.adb] - Blame information for rev 706

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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--                     S Y S T E M . T R A C E B A C K                      --
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--                                                                          --
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--                                 B o d y                                  --
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--                                                                          --
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--                     Copyright (C) 1999-2010, AdaCore                     --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This version uses System.Machine_State_Operations routines
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with System.Machine_State_Operations;
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package body System.Traceback is
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   use System.Machine_State_Operations;
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   ----------------
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   -- Call_Chain --
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   ----------------
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   procedure Call_Chain
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     (Traceback : System.Address;
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      Max_Len   : Natural;
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      Len       : out Natural;
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      Exclude_Min : System.Address := System.Null_Address;
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      Exclude_Max : System.Address := System.Null_Address;
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      Skip_Frames : Natural := 1)
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   is
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      type Tracebacks_Array is array (1 .. Max_Len) of Code_Loc;
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      pragma Suppress_Initialization (Tracebacks_Array);
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      M     : Machine_State;
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      Code  : Code_Loc;
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      Trace : Tracebacks_Array;
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      for Trace'Address use Traceback;
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      N_Skips  : Natural := 0;
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   begin
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      M := Allocate_Machine_State;
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      Set_Machine_State (M);
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      --  Skip the requested number of frames
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      loop
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         Code := Get_Code_Loc (M);
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         exit when Code = Null_Address or else N_Skips = Skip_Frames;
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         Pop_Frame (M);
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         N_Skips := N_Skips + 1;
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      end loop;
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      --  Now, record the frames outside the exclusion bounds, updating
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      --  the Len output value along the way.
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      Len := 0;
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      loop
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         Code := Get_Code_Loc (M);
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         exit when Code = Null_Address or else Len = Max_Len;
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         if Code < Exclude_Min or else Code > Exclude_Max then
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            Len := Len + 1;
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            Trace (Len) := Code;
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         end if;
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         Pop_Frame (M);
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      end loop;
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      Free_Machine_State (M);
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   end Call_Chain;
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   ------------------
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   -- C_Call_Chain --
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   ------------------
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   function C_Call_Chain
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     (Traceback : System.Address;
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      Max_Len   : Natural) return Natural
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   is
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      Val : Natural;
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   begin
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      Call_Chain (Traceback, Max_Len, Val);
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      return Val;
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   end C_Call_Chain;
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end System.Traceback;

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