590549fbed
2011-08-29 Tristan Gingold <gingold@adacore.com> * a-exexpr.adb (Propagate_Exception): Remove all the parameters as they were unused. * a-exexpr-gcc.adb (Propagate_Exception): Ditto. * a-except-2005.adb (Propagate_Exception): Adjust spec. (Raise_Current_Excep): Adjust call. (Raise_From_Signal_Handler): Call now simply call Raise_Current_Excep. 2011-08-29 Thomas Quinot <quinot@adacore.com> * exp_disp.adb: Minor reformatting. From-SVN: r178215
102 lines
4.7 KiB
Ada
102 lines
4.7 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) 1992-2011, 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 Ada.Unchecked_Conversion;
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separate (Ada.Exceptions)
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package body Exception_Propagation is
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-- Common binding to __builtin_longjmp for sjlj variants.
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procedure builtin_longjmp (buffer : System.Address; Flag : Integer);
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pragma No_Return (builtin_longjmp);
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pragma Import (Intrinsic, builtin_longjmp, "__builtin_longjmp");
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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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is
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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 (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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