1------------------------------------------------------------------------------ 2-- -- 3-- GNAT LIBRARY COMPONENTS -- 4-- -- 5-- G N A T . M O S T _ R E C E N T _ E X C E P T I O N -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 2000 Ada Core Technologies, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 2, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- 17-- for more details. You should have received a copy of the GNU General -- 18-- Public License distributed with GNAT; see file COPYING. If not, write -- 19-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- 20-- MA 02111-1307, USA. -- 21-- -- 22-- As a special exception, if other files instantiate generics from this -- 23-- unit, or you link this unit with other files to produce an executable, -- 24-- this unit does not by itself cause the resulting executable to be -- 25-- covered by the GNU General Public License. This exception does not -- 26-- however invalidate any other reasons why the executable file might be -- 27-- covered by the GNU Public License. -- 28-- -- 29-- GNAT was originally developed by the GNAT team at New York University. -- 30-- Extensive contributions were provided by Ada Core Technologies Inc. -- 31-- -- 32------------------------------------------------------------------------------ 33 34-- This package provides routines for accessing the most recently raised 35-- exception. This may be useful for certain logging activities. It may 36-- also be useful for mimicing implementation dependent capabilities in 37-- Ada 83 compilers, but see also GNAT.Current_Exceptions for this usage. 38 39with Ada.Exceptions; 40package GNAT.Most_Recent_Exception is 41 42 ----------------- 43 -- Subprograms -- 44 ----------------- 45 46 function Occurrence 47 return Ada.Exceptions.Exception_Occurrence; 48 -- Returns the Exception_Occurrence for the most recently raised 49 -- exception in the current task. If no exception has been raised 50 -- in the current task prior to the call, returns Null_Occurrence. 51 52 function Occurrence_Access 53 return Ada.Exceptions.Exception_Occurrence_Access; 54 -- Similar to the above, but returns an access to the occurrence value. 55 -- This value is in a task specific location, and may be validly accessed 56 -- as long as no further exception is raised in the calling task. 57 58 -- Note: unlike the routines in GNAT.Current_Exception, these functions 59 -- access the most recently raised exception, regardless of where they 60 -- are called. Consider the following example: 61 62 -- exception 63 -- when Constraint_Error => 64 -- begin 65 -- ... 66 -- exception 67 -- when Tasking_Error => ... 68 -- end; 69 -- 70 -- -- Assuming a Tasking_Error was raised in the inner block, 71 -- -- a call to GNAT.Most_Recent_Exception.Occurrence will 72 -- -- return information about this Tasking_Error exception, 73 -- -- not about the Constraint_Error exception being handled 74 -- -- by the current handler code. 75 76 77end GNAT.Most_Recent_Exception; 78