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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;
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