------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- G N A T . E X C E P T I O N S -- -- -- -- S p e c -- -- -- -- -- -- Copyright (C) 2000-2001 Ada Core Technologies, 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, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, 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. -- -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- -- -- ------------------------------------------------------------------------------ -- This package provides an interface for raising predefined exceptions -- with an exception message. It can be used from Pure units. This unit -- is for internal use only, it is not generally available to applications. package GNAT.Exceptions is pragma Pure (Exceptions); type Exception_Type is limited null record; -- Type used to specify which exception to raise. -- Really Exception_Type is Exception_Id, but Exception_Id can't be -- used directly since it is declared in the non-pure unit Ada.Exceptions, -- Exception_Id is in fact simply a pointer to the type Exception_Data -- declared in System.Standard_Library (which is also non-pure). So what -- we do is to define it here as a by reference type (any by reference -- type would do), and then Import the definitions from Standard_Library. -- Since this is a by reference type, these will be passed by reference, -- which has the same effect as passing a pointer. -- This type is not private because keeping it by reference would require -- defining it in a way (e.g a tagged type) that would drag other run time -- files, which is unwanted in the case of e.g ravenscar where we want to -- minimize the number of run time files needed by default. CE : constant Exception_Type; -- Constraint_Error PE : constant Exception_Type; -- Program_Error SE : constant Exception_Type; -- Storage_Error TE : constant Exception_Type; -- Tasking_Error -- One of these constants is used in the call to specify the exception procedure Raise_Exception (E : Exception_Type; Message : String); pragma Import (Ada, Raise_Exception, "__gnat_raise_exception"); pragma No_Return (Raise_Exception); -- Raise specified exception with specified message private pragma Import (C, CE, "constraint_error"); pragma Import (C, PE, "program_error"); pragma Import (C, SE, "storage_error"); pragma Import (C, TE, "tasking_error"); -- References to the exception structures in the standard library end GNAT.Exceptions;