122 lines
5.2 KiB
Ada
122 lines
5.2 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- 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 --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This is the default version, using the __builtin_setjmp/longjmp EH
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-- mechanism.
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with System.Storage_Elements; use System.Storage_Elements;
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pragma Warnings (Off);
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-- Since several constructs give warnings in 3.14a1, including unreferenced
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-- variables and pragma Unreferenced itself.
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separate (Ada.Exceptions)
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package body Exception_Propagation is
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---------------------
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-- Setup_Exception --
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---------------------
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procedure Setup_Exception
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(Excep : EOA;
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Current : EOA;
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Reraised : Boolean := False)
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is
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pragma Unreferenced (Excep, Current, Reraised);
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begin
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-- In the GNAT-SJLJ case this "stack" only exists implicitly, by way of
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-- local occurrence declarations together with save/restore operations
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-- generated by the front-end, and this routine has nothing to do.
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null;
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end Setup_Exception;
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-------------------------
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-- Propagate_Exception --
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-------------------------
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procedure Propagate_Exception
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(E : Exception_Id;
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From_Signal_Handler : Boolean)
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is
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pragma Inspection_Point (E);
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Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;
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Excep : constant EOA := Get_Current_Excep.all;
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begin
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-- Compute the backtrace for this occurrence if corresponding binder
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-- option has been set. Call_Chain takes care of the reraise case.
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Call_Chain (Excep);
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-- Note on above call to Call_Chain:
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-- We used to only do this if From_Signal_Handler was not set,
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-- based on the assumption that backtracing from a signal handler
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-- would not work due to stack layout oddities. However, since
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-- 1. The flag is never set in tasking programs (Notify_Exception
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-- performs regular raise statements), and
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-- 2. No problem has shown up in tasking programs around here so
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-- far, this turned out to be too strong an assumption.
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-- As, in addition, the test was
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-- 1. preventing the production of backtraces in non-tasking
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-- programs, and
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-- 2. introducing a behavior inconsistency between
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-- the tasking and non-tasking cases,
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-- we have simply removed it
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-- If the jump buffer pointer is non-null, transfer control using
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-- it. Otherwise announce an unhandled exception (note that this
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-- means that we have no finalizations to do other than at the outer
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-- level). Perform the necessary notification tasks in both cases.
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if Jumpbuf_Ptr /= Null_Address then
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if not Excep.Exception_Raised then
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Excep.Exception_Raised := True;
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Exception_Traces.Notify_Handled_Exception;
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end if;
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builtin_longjmp (To_Jmpbuf_Address (Jumpbuf_Ptr), 1);
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else
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Exception_Traces.Notify_Unhandled_Exception;
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Exception_Traces.Unhandled_Exception_Terminate;
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end if;
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end Propagate_Exception;
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end Exception_Propagation;
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