128 lines
5.5 KiB
Ada
128 lines
5.5 KiB
Ada
------------------------------------------------------------------------------
|
|
-- --
|
|
-- 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) 1992-2006 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 2, 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. See the GNU General Public License --
|
|
-- for more details. You should have received a copy of the GNU General --
|
|
-- Public License distributed with GNAT; see file COPYING. If not, write --
|
|
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
|
|
-- Boston, MA 02110-1301, USA. --
|
|
-- --
|
|
-- As a special exception, if other files instantiate generics from this --
|
|
-- unit, or you link this unit with other files to produce an executable, --
|
|
-- this unit does not by itself cause the resulting executable to be --
|
|
-- covered by the GNU General Public License. This exception does not --
|
|
-- however invalidate any other reasons why the executable file might be --
|
|
-- covered by the GNU Public License. --
|
|
-- --
|
|
-- 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 System.Storage_Elements; use System.Storage_Elements;
|
|
|
|
pragma Warnings (Off);
|
|
-- Since several constructs give warnings in 3.14a1, including unreferenced
|
|
-- variables and pragma Unreferenced itself.
|
|
|
|
separate (Ada.Exceptions)
|
|
package body Exception_Propagation is
|
|
|
|
procedure builtin_longjmp (buffer : Address; Flag : Integer);
|
|
pragma No_Return (builtin_longjmp);
|
|
pragma Import (C, builtin_longjmp, "_gnat_builtin_longjmp");
|
|
|
|
---------------------
|
|
-- Setup_Exception --
|
|
---------------------
|
|
|
|
procedure Setup_Exception
|
|
(Excep : EOA;
|
|
Current : EOA;
|
|
Reraised : Boolean := False)
|
|
is
|
|
pragma Unreferenced (Excep, Current, Reraised);
|
|
begin
|
|
-- In the GNAT-SJLJ case this "stack" only exists implicitely, by way of
|
|
-- local occurrence declarations together with save/restore operations
|
|
-- generated by the front-end, and this routine has nothing to do.
|
|
|
|
null;
|
|
end Setup_Exception;
|
|
|
|
-------------------------
|
|
-- Propagate_Exception --
|
|
-------------------------
|
|
|
|
procedure Propagate_Exception
|
|
(E : Exception_Id;
|
|
From_Signal_Handler : Boolean)
|
|
is
|
|
pragma Inspection_Point (E);
|
|
|
|
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;
|