File : g-trasym.adb


------------------------------------------------------------------------------
--                                                                          --
--                         GNAT RUN-TIME COMPONENTS                         --
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--             G N A T . T R A C E B A C K . S Y M B O L I C                --
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--                            $Revision: 1.5 $
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--              Copyright (C) 1999 Ada Core Technologies, Inc.              --
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------------------------------------------------------------------------------

--  Run-time symbolic traceback support
--  This file has been modified by Juergen Pfeifer (31-Dec-1999) for
--  the purpose to support the Ada for Linux Team implementation of
--  convert_addresses. This implementation has the advantage to run
--  on the binutils as they are deployed on Linux.

with System.Soft_Links;
with Ada.Exceptions.Traceback; use Ada.Exceptions.Traceback;

package body GNAT.Traceback.Symbolic is

   package TSL renames System.Soft_Links;

   ------------------------
   -- Symbolic_Traceback --
   ------------------------

   function Symbolic_Traceback (Traceback : Tracebacks_Array) return String is
      procedure convert_addresses
        (addrs    : System.Address;
         n_addr   : Integer;
         buf      : System.Address;
         len      : System.Address);
      pragma Import (C, convert_addresses, "convert_addresses");
      --  This is the ALT Linux specific version adapted to the binutils
      --  deployed with most Linuxes. These binutils already have an
      --  addr2line tool that demangles Ada symbolic names, but there are
      --  version dependant variants for the option names. Therefore our
      --  implementation spawns a shell script that does normalization of
      --  the option and then executes addr2line and communicates with it
      --  through a bidirectional pipe.
      --
      --  Note that this procedure is *not* thread-safe.

      B_Size : constant Integer := 256 * Traceback'Length;
      Len    : Integer := B_Size;
      Res    : String (1 .. B_Size);

   begin
      if Traceback'Length > 0 then
         TSL.Lock_Task.all;
         convert_addresses
           (Traceback'Address, Traceback'Length, Res (1)'Address, Len'Address);
         TSL.Unlock_Task.all;
         return Res (1 .. Len);
      else
         return "";
      end if;
   end Symbolic_Traceback;

   function Symbolic_Traceback (E : Exception_Occurrence) return String is
   begin
      return Symbolic_Traceback (Tracebacks (E));
   end Symbolic_Traceback;

end GNAT.Traceback.Symbolic;