------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- S Y S T E M . P U R E _ E X C E P T I O N S -- -- -- -- S p e c -- -- -- -- Copyright (C) 2000-2019, Free Software Foundation, 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 3, 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. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- . -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- 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. pragma Compiler_Unit_Warning; package System.Pure_Exceptions is pragma Pure; 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. using a tagged type) that would drag in 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 System.Pure_Exceptions;