[haiku-development] Re: Paladin crashes when making project
- From: Stephan Assmus <superstippi@xxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Wed, 25 Mar 2009 15:39:54 +0100
Hi Stephan,
On 2009-03-25 at 15:28:37 [+0100], Stephan Lichtenauer
<fbsdlists@xxxxxxxxxxxxxx> wrote:
> just to quickly introduce myself: I am - quite impressed by the
> dedication with which you are driving this project - watching Haiku for
> several years now and also lurking on IRC and the mailing lists for some
> time. Finally I have decided now that it is time to have a closer look at
> it and begin to seriously try some things out.
Seems like we can slowly begin to pick the fruits now, can't we? :-)
> I am running Haiku VMWare pre alpha download R29625 running on VMWare
> Fusion 2.0.2. I have downloaded & installed Paladin 1.0rc4 from
> haikuware.com and created a simple project called "Hello" with one file
> "test.c" which is containing the classical "Hello world" code.
>
> Now when I click on the "Make" (Alt-M) menu item, Paladin crashes with
> this stack trace:
>
> [Switching to team /boot/apps/Paladin/Paladin (6588) thread build thread
> (6618)]
> 0x00452614 in BString::_IsShareable () from /boot/beos/system/lib/
> libbe.so
> (gdb) bt
> #0 0x00452614 in BString::_IsShareable () from /boot/beos/system/lib/
> libbe.so
> #1 0x0044ccf6 in BString::BString () from /boot/beos/system/lib/ libbe.so
> #2 0x00236d5a in Project::CompileFile ()
> #3 0x0023c327 in ProjectBuilder::BuildThread ()
> #4 0x0050ac98 in thread_entry () from /boot/beos/system/lib/libroot.so
> #5 0x70080fec in ?? ()
>
> When googling I have found some information about RC2 crashing with gcc4
> hybrid builds but I the stack trace looked differently...
>
> Does somebody have any idea what is going wrong here? Is there additional
> information I could obtain?
Your best bet would be to look a the Paladin source code. I assume it's
available, but I don't know. The Haiku BString implementation has grown
"copy on write" capabilities, which the BeOS version didn't have. This is
the constructor which is used by Paladin:
BString::BString(const BString& string)
: fPrivateData(NULL)
{
// check if source is sharable - if so, share else clone
if (string._IsShareable()) {
fPrivateData = string.fPrivateData;
atomic_add(&_ReferenceCount(), 1);
// string cannot go away right now
} else
_Init(string.String(), string.Length());
}
Looking at BString::IsShareable():
inline bool
BString::_IsShareable() const
{
return fPrivateData != NULL && _ReferenceCount() >= 0;
}
Pretty much the only explaination is that Paladin passes an invalid BString
to the copy constructor of another string. Or there is a bug in Haiku's
BString implementation, but that is rather unlikely, since it's had lots of
exposure already.
Best regards,
-Stephan
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