c++/3175: CTOR/DTOR Mismatch Error

[bcrowder at station dot sony dot com]

>Number:         3175
>Category:       c++
>Synopsis:       CTOR/DTOR Mismatch Error
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 13 11:26:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Brian Crowder
>Release:        gcc version 2.95.3 20010315 (release)
>Organization:
>Environment:
Linux 2.4.2 SMP
>Description:
The attached C++ code generates an unbalanced cascade of
constructor/destructor pairs resulting in one-too-many
DTORs being executed.

We discovered this bug while porting a piece of C++ code
Win32/MSVC++6.0.  The code frequently passes handles for
reference counted objects by value, and we were finding
that at the end of a given call-stack, our reference count
was short by one, causing the associated data to be
released prematurely.  Changing any of several pass-by-value
functions to accept or return values via const reference
provides a workaround.  Also, explicitly creating temporary
variables before function calls also seems to provide a
workaround of sorts.

Interestingly, instrumented with Insure++, our application
behaves correctly, but not when built normally.  My insure
license just ran out, so I haven't had a chance to test
this demonstration code.
>How-To-Repeat:
test.cpp is my demo C++ code
savetemps.out is the reporting from "g++ -v -save-temps test.cpp"
test.ii is the preprocessed source
gcc was built with no additional command-line options (just "configure; make bootstrap")

The source is built with the following command line:
g++ -o test test.cpp
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="test.ii"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="test.ii"

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