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optimization/9993: destructor not called for local object created within and returned from infinite loop

From: Jon_Udell at mentor dot com
To: gcc-gnats at gcc dot gnu dot org
Date: 7 Mar 2003 20:30:19 -0000
Subject: optimization/9993: destructor not called for local object created within and returned from infinite loop
Reply-to: Jon_Udell at mentor dot com
>Number:         9993
>Category:       optimization
>Synopsis:       destructor not called for local object created within and returned from infinite loop
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 07 20:36:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Jon Udell
>Release:        3.1
>Organization:
>Environment:
i686-pc-linux-gnu
>Description:
An object created in a do-while(1) loop for possible use as the return object of the function does not get destructed each time through the loop.

The erroneous output of the supplied program is:

Constructed with index 0
Constructed with index 1
Constructed with index 2
Destructed with index 2


The apparently correct output is:

Constructed with index 0
Destructed with index 0
Constructed with index 1
Destructed with index 1
Constructed with index 2
Copy constructed reusing index 2
Destructed with index 2
Destructed with index 2


One workaround is to explicitly return a dummy object after the loop even though the code will never be reached.  I'm guessing that with only the one return point inside the loop the compiler tries to create the object on the stack and return it without destructing it, forgetting to do the destruction when the return does not occur, and that putting in a second return point eliminates this optimization.

This problem does not exist on some previous versions of gcc that I am using, including:
gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-85) (i686)
gcc version 2.95.2 19991024 (release) (SunOS 5.8) 


>How-To-Repeat:
g++ temp.ii
a.out
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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