| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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; |
