Bug 198603
| Summary: | OpeOffice.org crashes: use of C-Style casts in C++ on multiple-inherited objects | ||||||
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| Product: | [Fedora] Fedora | Reporter: | Simon Meaden <simonmeaden> | ||||
| Component: | gcc | Assignee: | Jakub Jelinek <jakub> | ||||
| Status: | CLOSED UPSTREAM | QA Contact: | |||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | medium | ||||||
| Version: | 5 | CC: | caolanm, jakub | ||||
| Target Milestone: | --- | ||||||
| Target Release: | --- | ||||||
| Hardware: | i386 | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2006-07-12 14:01:50 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Attachments: |
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Description
Simon Meaden
2006-07-12 08:59:07 UTC
I see this, but it makes no sense :-(
break main
run -draw
break sd_optsitem.cxx:190
cont
use save as and StarDraw 3 as format.
#2 0x036e010d in binfilter::SdOptionsPrint::IsDraw (this=0xbf9d0cd0)
at ../inc/optsitem.hxx:619
619 BOOL IsDraw() const { Init(); return (BOOL) bDraw; }
#1 0x036dda58 in binfilter::SdOptionsGeneric::Init (this=0xbf9d0cd0)
at
/usr/src/redhat/BUILD/OOB680_m5/binfilter/bf_sd/source/ui/app/sd_optsitem.cxx:140
140 /*N*/ const Sequence< OUString > aNames( GetPropertyNames(...
So IsDraw calls Init which calls GetPropertyNames, now GetPropertyNames is a
pure virtual method of SdOptionsGeneric, and SdOptionsPrint derives from
SdOptionsGeneric. So SdOptionsPrint::GetPropertyNames should get called when
this is a SdOptionsPrint.
Adding a few
printf("... %p ... %p",this, dynamic_cast<SdOptionsPrint*>(this));
to those methods and I get this...
SdOptionsPrint::IsDraw: 0xbff12a00 is really SdOptionsPrint ? 0xbff12a00
SdOptionsGeneric::Init: 0xbff12a00 is really SdOptionsPrint ? (nil)
what the hell !?
caolanm->jakub: Any hints as to what could be behind this horror ?
ah, it's a whacked cast on a multiple inherited object, something like http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22132 Created attachment 132296 [details]
simple testcase
testcase for the problem
So if I have a multiple-inherited const object and cast it using c-style casts to one of it's base classes then the result is different if I am casting away constness vs not casting away constness. caolanm->jakub: I can of course work around this instance in OOo, but there are undoubtedly others. Sounds a bit like http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22132 Tracking upstream. |