+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME COMPONENTS --
--- --
--- G N A T . E X C E P T I O N S --
--- --
--- S p e c --
--- --
--- $Revision: 1.1 $
--- --
--- 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;
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