1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME COMPONENTS -- 4-- -- 5-- S Y S T E M . P U R E _ E X C E P T I O N S -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 2000-2009, Free Software Foundation, 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 3, 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. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNAT was originally developed by the GNAT team at New York University. -- 28-- Extensive contributions were provided by Ada Core Technologies Inc. -- 29-- -- 30------------------------------------------------------------------------------ 31 32-- This package provides an interface for raising predefined exceptions with 33-- an exception message. It can be used from Pure units. This unit is for 34-- internal use only, it is not generally available to applications. 35 36pragma Compiler_Unit; 37 38package System.Pure_Exceptions is 39 pragma Pure; 40 41 type Exception_Type is limited null record; 42 -- Type used to specify which exception to raise 43 44 -- Really Exception_Type is Exception_Id, but Exception_Id can't be 45 -- used directly since it is declared in the non-pure unit Ada.Exceptions, 46 47 -- Exception_Id is in fact simply a pointer to the type Exception_Data 48 -- declared in System.Standard_Library (which is also non-pure). So what 49 -- we do is to define it here as a by reference type (any by reference 50 -- type would do), and then Import the definitions from Standard_Library. 51 -- Since this is a by reference type, these will be passed by reference, 52 -- which has the same effect as passing a pointer. 53 54 -- This type is not private because keeping it by reference would require 55 -- defining it in a way (e.g a tagged type) that would drag other run time 56 -- files, which is unwanted in the case of e.g ravenscar where we want to 57 -- minimize the number of run time files needed by default. 58 59 CE : constant Exception_Type; -- Constraint_Error 60 PE : constant Exception_Type; -- Program_Error 61 SE : constant Exception_Type; -- Storage_Error 62 TE : constant Exception_Type; -- Tasking_Error 63 -- One of these constants is used in the call to specify the exception 64 65 procedure Raise_Exception (E : Exception_Type; Message : String); 66 pragma Import (Ada, Raise_Exception, "__gnat_raise_exception"); 67 pragma No_Return (Raise_Exception); 68 -- Raise specified exception with specified message 69 70private 71 pragma Import (C, CE, "constraint_error"); 72 pragma Import (C, PE, "program_error"); 73 pragma Import (C, SE, "storage_error"); 74 pragma Import (C, TE, "tasking_error"); 75 -- References to the exception structures in the standard library 76 77end System.Pure_Exceptions; 78