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other/7399: Exception object destructors called pre-maturely.

From: lclay at ecustomers dot com
To: gcc-gnats at gcc dot gnu dot org
Date: 24 Jul 2002 21:28:06 -0000
Subject: other/7399: Exception object destructors called pre-maturely.
Reply-to: lclay at ecustomers dot com
>Number:         7399
>Category:       other
>Synopsis:       Exception object destructors called pre-maturely.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jul 24 14:36:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Larry Clay; Ecustomers Inc.
>Release:        g++ 2.96
>Organization:
>Environment:
linux 2.4.2-2 #1 on i686
>Description:
The context of this bug is a method that throws an exception containing an error message and a calling method that "catch"es the exception. The exception object "news" some memory in its constructor, and "deletes" it in its destructor. The destructor is called and the memory is deleted in the method that does the throw. Thus the catching method gets an exception object with a corrupted message buffer. 

For what its worth... the program the test program was based on works on windows when compiled with the visual c++ compiler. The test program fails on both linux and cygwin.
>How-To-Repeat:

Compile and run the program that comprises the second part of the attachment. Set and export the environment variable "MALLOC_CHECK_=1". When the test program is run, usually the message attached to the exception object has been corrupted when it is caught. Also, MALLOC_CHECK will report that the message buffer is free'd after already being free'd. 
>Fix:
I worked around this in our production code by giving the exception object a fixed length buffer that it can store the exception error message in. 
>Release-Note:
>Audit-Trail:
>Unformatted:
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