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------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- S Y S T E M . A S S E R T I O N S --
-- --
-- B o d y --
-- --
-- $Revision: 1.5 $ --
-- --
-- Copyright (C) 1992,1993,1994,1995,1996 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 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). --
-- --
------------------------------------------------------------------------------
-- Note: it would be much simpler to use Ada.Exceptions.Raise_Exception,
-- but that would drag in a lot of the runtime, and especially in the
-- compiler itself, which uses assertions, we do not want these extra
-- units included indirectly as a result of using assertions. The result
-- is that we duplicate subtantial chunks of Ada.Exceptions in this unit.
with System;
with System.Task_Specific_Data; use System.Task_Specific_Data;
with System.Standard_Library;
with Unchecked_Conversion;
package body System.Assertions is
type Buffer_Ptr is access System.Standard_Library.Exception_Message_Buffer;
-- A thin pointer to String
function To_Buffer_Ptr is
new Unchecked_Conversion (System.Address, Buffer_Ptr);
-- Conversion from address to string access for exception msg manipulation
--------------------------
-- Raise_Assert_Failure --
--------------------------
procedure Raise_Assert_Failure (Msg : String) is
begin
-- Set message in place with negative length. There is a special
-- arrangement with regard to negative lengths. When a negative
-- length is set, then the next call to set the length to zero
-- (which will happen when the exception is raised using the
-- normal assert statement), results in negating the length so
-- it now has the proper positive value.
Set_Message_Length (-Msg'Length);
To_Buffer_Ptr (Get_Message_Addr).all (1 .. Msg'Length) := Msg;
-- The following is for back compatibility with the bootstrap
-- path, and can be removed later on.
Assert_Msg (1 .. Msg'Length) := Msg;
Assert_Msg_Length := Msg'Length;
-- Now raise the actual exception. This looks like a raise with no
-- message, but because of the special handling for negative lengths
-- as set above, this acts as a raise with message.
raise Assert_Failure;
end Raise_Assert_Failure;
end System.Assertions;
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