| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- G N A T . E X C E P T I O N S -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- $Revision: 1.9 $ |
| -- -- |
| -- 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; |
