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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--  A D A . E X C E P T I O N S . E X C E P T I O N _ P R O P A G A T I O N --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2011, 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, using the __builtin_setjmp/longjmp EH

--  mechanism.

with Ada.Unchecked_Conversion;

separate (Ada.Exceptions)

package body Exception_Propagation is

   --  Common binding to __builtin_longjmp for sjlj variants.

   procedure builtin_longjmp (buffer : System.Address; Flag : Integer);

   pragma No_Return (builtin_longjmp);

   pragma Import (Intrinsic, builtin_longjmp, "__builtin_longjmp");

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

   -- Propagate_Exception --

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

   procedure Propagate_Exception

   is

      Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;

      Excep       : constant EOA := Get_Current_Excep.all;

   begin

      --  Compute the backtrace for this occurrence if corresponding binder

      --  option has been set. Call_Chain takes care of the reraise case.

      Call_Chain (Excep);

      --  Note on above call to Call_Chain:

      --  We used to only do this if From_Signal_Handler was not set,

      --  based on the assumption that backtracing from a signal handler

      --  would not work due to stack layout oddities. However, since

      --   1. The flag is never set in tasking programs (Notify_Exception

      --      performs regular raise statements), and

      --   2. No problem has shown up in tasking programs around here so

      --      far, this turned out to be too strong an assumption.

      --  As, in addition, the test was

      --   1. preventing the production of backtraces in non-tasking

      --      programs, and

      --   2. introducing a behavior inconsistency between

      --      the tasking and non-tasking cases,

      --  we have simply removed it

      --  If the jump buffer pointer is non-null, transfer control using

      --  it. Otherwise announce an unhandled exception (note that this

      --  means that we have no finalizations to do other than at the outer

      --  level). Perform the necessary notification tasks in both cases.

      if Jumpbuf_Ptr /= Null_Address then

         if not Excep.Exception_Raised then

            Excep.Exception_Raised := True;

            Exception_Traces.Notify_Handled_Exception;

         end if;

         builtin_longjmp (Jumpbuf_Ptr, 1);

      else

         Exception_Traces.Notify_Unhandled_Exception;

         Exception_Traces.Unhandled_Exception_Terminate;

      end if;

   end Propagate_Exception;

end Exception_Propagation;