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* [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault
@ 2011-02-24 7:13 isahib at xtra dot co.nz
2011-02-25 10:50 ` [Bug c++/47873] " redi at gcc dot gnu.org
` (13 more replies)
0 siblings, 14 replies; 15+ messages in thread
From: isahib at xtra dot co.nz @ 2011-02-24 7:13 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
Summary: Multiple Inheritance - Covariant Virtual Function -
Segfault
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: isahib@xtra.co.nz
Created attachment 23448
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23448
gcc-4.6 -save-temps output, demos bug
The attached BugReport.ii demos a reproducible bug in a complex multiple
inheritance scheme. When the covariant virtual function BugReport::Object::This
is overridden and called in a derived class then the program segfaults.
ggc-4.6 -v
==========
Using built-in specs.
COLLECT_GCC=gcc-4.6
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.6.0/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.6-20110216-1'
--with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++,go --prefix=/usr
--program-suffix=-4.6 --enable-shared --enable-multiarch
--enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.6 --libdir=/usr/lib --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-plugin --enable-gold --enable-ld=default --with-plugin-ld=ld.gold
--enable-objc-gc --with-arch-32=i586 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.6.0 20110216 (experimental) [trunk revision 170225] (Debian
4.6-20110216-1)
gcc-4.6 build command line
==========================
-std=c++0x -Wall -Wextra -pedantic -g -save-temps
Shell output
============
Segmentation fault
Gdb output
==========
Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/47873] Multiple Inheritance - Covariant Virtual Function - Segfault
2011-02-24 7:13 [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault isahib at xtra dot co.nz
@ 2011-02-25 10:50 ` redi at gcc dot gnu.org
2011-02-25 11:18 ` redi at gcc dot gnu.org
` (12 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: redi at gcc dot gnu.org @ 2011-02-25 10:50 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-02-25 10:47:00 UTC ---
do you think you could make the example more confusing? maybe if you named
every namespace, class and member function the same, instead of only doing that
for most of them? ;)
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/47873] Multiple Inheritance - Covariant Virtual Function - Segfault
2011-02-24 7:13 [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault isahib at xtra dot co.nz
2011-02-25 10:50 ` [Bug c++/47873] " redi at gcc dot gnu.org
@ 2011-02-25 11:18 ` redi at gcc dot gnu.org
2011-02-25 12:09 ` redi at gcc dot gnu.org
` (11 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: redi at gcc dot gnu.org @ 2011-02-25 11:18 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-02-25 11:08:07 UTC ---
this doesn't segfault with 4.5
I have a reduced version with no stdlib or c++0x dependencies, and with less
confusing naming - will attach shortly
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/47873] Multiple Inheritance - Covariant Virtual Function - Segfault
2011-02-24 7:13 [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault isahib at xtra dot co.nz
2011-02-25 10:50 ` [Bug c++/47873] " redi at gcc dot gnu.org
2011-02-25 11:18 ` redi at gcc dot gnu.org
@ 2011-02-25 12:09 ` redi at gcc dot gnu.org
2011-02-25 12:35 ` [Bug c++/47873] [4.6 Regression] " redi at gcc dot gnu.org
` (10 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: redi at gcc dot gnu.org @ 2011-02-25 12:09 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #23448|0 |1
is obsolete| |
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-02-25 11:37:37 UTC ---
Created attachment 23465
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23465
reduced testcase
reduced testcase which removes c++0x and libstdc++ dependencies, removes the
java-style access control, re-indents and renames some of the identically-named
namespaces, classes and function to make it slightly more readable
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/47873] [4.6 Regression] Multiple Inheritance - Covariant Virtual Function - Segfault
2011-02-24 7:13 [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault isahib at xtra dot co.nz
` (2 preceding siblings ...)
2011-02-25 12:09 ` redi at gcc dot gnu.org
@ 2011-02-25 12:35 ` redi at gcc dot gnu.org
2011-02-25 13:33 ` [Bug c++/47873] [4.6 Regression] virtual " redi at gcc dot gnu.org
` (9 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: redi at gcc dot gnu.org @ 2011-02-25 12:35 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2011.02.25 11:38:32
Summary|Multiple Inheritance - |[4.6 Regression] Multiple
|Covariant Virtual Function |Inheritance - Covariant
|- Segfault |Virtual Function - Segfault
Ever Confirmed|0 |1
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-02-25 11:38:32 UTC ---
confirmed, no crash with 4.5 or earlier
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/47873] [4.6 Regression] virtual Inheritance - Covariant Virtual Function - Segfault
2011-02-24 7:13 [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault isahib at xtra dot co.nz
` (3 preceding siblings ...)
2011-02-25 12:35 ` [Bug c++/47873] [4.6 Regression] " redi at gcc dot gnu.org
@ 2011-02-25 13:33 ` redi at gcc dot gnu.org
2011-02-26 19:59 ` redi at gcc dot gnu.org
` (8 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: redi at gcc dot gnu.org @ 2011-02-25 13:33 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Summary|[4.6 Regression] Multiple |[4.6 Regression] virtual
|Inheritance - Covariant |Inheritance - Covariant
|Virtual Function - Segfault |Virtual Function - Segfault
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-02-25 13:07:26 UTC ---
minimal testcase with no namespaces or multiple inheritance
the segfault goes away if Ent is an empty class or if virtual inheritance isn't
used
struct Base
{
virtual ~Base(){}
virtual Base& This() { return *this; }
};
struct Ent : virtual Base
{
void *m_Body;
Ent& This() { return *this; }
virtual Ent& body()
{
return This();
}
};
struct Msg : virtual Ent
{
Msg()
{
body();
}
Msg& This() { return *this; }
};
int main()
{
Msg m;
return 0;
}
miscompiled by gcc-4.6-20110219 snapshot
Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0 0x0000000000000000 in ?? ()
#1 0x00000000004007ff in Ent::body (this=0x7fffffffe598) at bug.cc:17
#2 0x00000000004009ca in Msg::Msg (this=0x7fffffffe590,
__in_chrg=<value optimized out>, __vtt_parm=<value optimized out>)
at bug.cc:27
#3 0x0000000000400719 in main () at bug.cc:35
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/47873] [4.6 Regression] virtual Inheritance - Covariant Virtual Function - Segfault
2011-02-24 7:13 [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault isahib at xtra dot co.nz
` (4 preceding siblings ...)
2011-02-25 13:33 ` [Bug c++/47873] [4.6 Regression] virtual " redi at gcc dot gnu.org
@ 2011-02-26 19:59 ` redi at gcc dot gnu.org
2011-02-27 19:31 ` jason at gcc dot gnu.org
` (7 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: redi at gcc dot gnu.org @ 2011-02-26 19:59 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-02-26 19:45:08 UTC ---
*** Bug 47874 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/47873] [4.6 Regression] virtual Inheritance - Covariant Virtual Function - Segfault
2011-02-24 7:13 [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault isahib at xtra dot co.nz
` (5 preceding siblings ...)
2011-02-26 19:59 ` redi at gcc dot gnu.org
@ 2011-02-27 19:31 ` jason at gcc dot gnu.org
2011-02-28 6:53 ` isahib at xtra dot co.nz
` (6 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: jason at gcc dot gnu.org @ 2011-02-27 19:31 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |jason at gcc dot gnu.org
--- Comment #7 from Jason Merrill <jason at gcc dot gnu.org> 2011-02-27 17:12:45 UTC ---
Looking.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/47873] [4.6 Regression] virtual Inheritance - Covariant Virtual Function - Segfault
2011-02-24 7:13 [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault isahib at xtra dot co.nz
` (6 preceding siblings ...)
2011-02-27 19:31 ` jason at gcc dot gnu.org
@ 2011-02-28 6:53 ` isahib at xtra dot co.nz
2011-02-28 7:48 ` isahib at xtra dot co.nz
` (5 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: isahib at xtra dot co.nz @ 2011-02-28 6:53 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
--- Comment #8 from Ibaidul Sahib <isahib at xtra dot co.nz> 2011-02-28 06:39:39 UTC ---
Confirmed that this testcase runs fine with gcc 4.4.5/4.5.2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47874 still fails on gcc
4.4.5/4.5.2
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/47873] [4.6 Regression] virtual Inheritance - Covariant Virtual Function - Segfault
2011-02-24 7:13 [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault isahib at xtra dot co.nz
` (7 preceding siblings ...)
2011-02-28 6:53 ` isahib at xtra dot co.nz
@ 2011-02-28 7:48 ` isahib at xtra dot co.nz
2011-02-28 9:45 ` redi at gcc dot gnu.org
` (4 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: isahib at xtra dot co.nz @ 2011-02-28 7:48 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
--- Comment #9 from Ibaidul Sahib <isahib at xtra dot co.nz> 2011-02-28 06:53:23 UTC ---
(In reply to comment #1)
> do you think you could make the example more confusing? maybe if you named
> every namespace, class and member function the same, instead of only doing that
> for most of them? ;)
Abusive C++ :-) stripped from a real program but had mental problems
simplifying it further without losing the original context. Thanks for the
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873#c5
sample.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/47873] [4.6 Regression] virtual Inheritance - Covariant Virtual Function - Segfault
2011-02-24 7:13 [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault isahib at xtra dot co.nz
` (8 preceding siblings ...)
2011-02-28 7:48 ` isahib at xtra dot co.nz
@ 2011-02-28 9:45 ` redi at gcc dot gnu.org
2011-02-28 23:25 ` jason at gcc dot gnu.org
` (3 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: redi at gcc dot gnu.org @ 2011-02-28 9:45 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-02-28 09:31:32 UTC ---
(In reply to comment #8)
> Confirmed that this testcase runs fine with gcc 4.4.5/4.5.2
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47874 still fails on gcc
> 4.4.5/4.5.2
ah, I didn't realise it fails on different versions, sorry. I'll try to reduce
it and reopen Bug 47874
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/47873] [4.6 Regression] virtual Inheritance - Covariant Virtual Function - Segfault
2011-02-24 7:13 [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault isahib at xtra dot co.nz
` (9 preceding siblings ...)
2011-02-28 9:45 ` redi at gcc dot gnu.org
@ 2011-02-28 23:25 ` jason at gcc dot gnu.org
2011-03-02 19:50 ` jason at gcc dot gnu.org
` (2 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: jason at gcc dot gnu.org @ 2011-02-28 23:25 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
--- Comment #11 from Jason Merrill <jason at gcc dot gnu.org> 2011-02-28 21:41:24 UTC ---
Author: jason
Date: Mon Feb 28 21:41:21 2011
New Revision: 170576
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=170576
Log:
PR c++/47873
* class.c (update_vtable_entry_for_fn): Check BINFO_LOST_PRIMARY_P
after checking for a non-thunk.
Added:
trunk/gcc/testsuite/g++.dg/inherit/covariant18.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/class.c
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/47873] [4.6 Regression] virtual Inheritance - Covariant Virtual Function - Segfault
2011-02-24 7:13 [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault isahib at xtra dot co.nz
` (10 preceding siblings ...)
2011-02-28 23:25 ` jason at gcc dot gnu.org
@ 2011-03-02 19:50 ` jason at gcc dot gnu.org
2011-05-20 9:50 ` isahib at xtra dot co.nz
2011-05-20 10:27 ` redi at gcc dot gnu.org
13 siblings, 0 replies; 15+ messages in thread
From: jason at gcc dot gnu.org @ 2011-03-02 19:50 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
--- Comment #12 from Jason Merrill <jason at gcc dot gnu.org> 2011-03-02 19:49:50 UTC ---
Fixed.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/47873] [4.6 Regression] virtual Inheritance - Covariant Virtual Function - Segfault
2011-02-24 7:13 [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault isahib at xtra dot co.nz
` (11 preceding siblings ...)
2011-03-02 19:50 ` jason at gcc dot gnu.org
@ 2011-05-20 9:50 ` isahib at xtra dot co.nz
2011-05-20 10:27 ` redi at gcc dot gnu.org
13 siblings, 0 replies; 15+ messages in thread
From: isahib at xtra dot co.nz @ 2011-05-20 9:50 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
--- Comment #13 from Ibaidul Sahib <isahib at xtra dot co.nz> 2011-05-20 09:29:00 UTC ---
(In reply to comment #12)
> Fixed.
Thanks I have tested this and the bug is fixed.
ggc-4.6 -v
==========
gcc version 4.6.1 20110329 (prerelease) (Debian 4.6.0-2)
uname -a
========
Linux debian 2.6.38-2-amd64 #1 SMP Sun May 8 13:51:57 UTC 2011 x86_64 GNU/Linux
BTW who is responsible for changing the bug report Status to Verified/Closed,
QA or me?
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug c++/47873] [4.6 Regression] virtual Inheritance - Covariant Virtual Function - Segfault
2011-02-24 7:13 [Bug c++/47873] New: Multiple Inheritance - Covariant Virtual Function - Segfault isahib at xtra dot co.nz
` (12 preceding siblings ...)
2011-05-20 9:50 ` isahib at xtra dot co.nz
@ 2011-05-20 10:27 ` redi at gcc dot gnu.org
13 siblings, 0 replies; 15+ messages in thread
From: redi at gcc dot gnu.org @ 2011-05-20 10:27 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47873
--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-05-20 09:46:30 UTC ---
(In reply to comment #13)
> BTW who is responsible for changing the bug report Status to Verified/Closed,
> QA or me?
Don't bother, we don't use that status - RESOLVED+FIXED is all that's needed
^ permalink raw reply [flat|nested] 15+ messages in thread
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2011-02-25 11:18 ` redi at gcc dot gnu.org
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