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c++/1672: dynamic_cast<> gives wrong value under certain circumstances

To: gcc-gnats at gcc dot gnu dot org
Subject: c++/1672: dynamic_cast<> gives wrong value under certain circumstances
From: mac at dgp dot toronto dot edu
Date: 16 Jan 2001 21:11:07 -0000
Reply-To: mac at dgp dot toronto dot edu

>Number:         1672
>Category:       c++
>Synopsis:       dynamic_cast<> gives wrong value under certain circumstances
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 16 13:16:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     mac@dgp.toronto.edu
>Release:        gcc version 2.95.3 20001229 (prerelease)
>Organization:
>Environment:
i386-linux
>Description:
Upcasting and then downcasting (using dynamic_cast<>) a 
pointer sometimes results in a wrong value.  The simple
attached program demonstrates this.  On my machine that
program resulted in the following output:

B1's constructor:
   this == 0xbffffa00
   pa == 0xbffffa08
   dynamic_cast<B1*>(pa) == 0xbffffa04
dynamic_cast: dynamic_cast.cc:28: B1::B1(): Assertion `this == dynamic_cast<B1*>(pa)' failed.

The assertion should not have failed.  It seems that having
this diamond shaped class hierarchy is necessary for this
behaviour to appear.
>How-To-Repeat:
Compile and run the attached source.
  g++ dynamic_cast.ii
is sufficient.  The assertion should not fail, but does (on
all the machines I tried).
>Fix:
Not found.
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="dynamic_cast.ii"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="dynamic_cast.ii"

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