Dynamic Arrays & Class Properties

Brad Roberts braddr at bellevue.puremagic.com
Fri Aug 29 00:11:01 PDT 2008


On Fri, 29 Aug 2008, Steven Schveighoffer wrote:

> "Brad Roberts" wrote
> > 
> > On Thu, 28 Aug 2008, Jarrett Billingsley wrote:
> > 
> > > "Brad Roberts" <braddr at bellevue.puremagic.com> wrote in message
> > > news:alpine.DEB.1.10.0808281424310.21051 at bellevue.puremagic.com...
> > > > On Thu, 28 Aug 2008, Jarrett Billingsley wrote:
> > > >
> > > >> Be warned though: the DMD backend sometimes generates buggy or >>
> > > incorrect
> > > >> code when using -inline, so be sure to test thoroughly both with and
> > > >> without
> > > >> the flag.
> > > >
> > > > Can you substantiate that with reproducable bug reports?  I'm sure >
> > > Walter
> > > > would appreciate it and place high prioirty on fixing such problems.
> > > >
> > > > Thanks,
> > > > Brad
> > > 
> > > You know, I'd love to be able to track down every heisenbug that
> > > spuriously
> > > shows up and then disappears with the smallest change in my 25000-line
> > > library when I use -inline, but I unfortunately don't have the time.
> > 
> > How about starting with _one_?
> > 
> > Without substantiation that it's actually a bug with inlining and not just
> > a bug in your code or some other problem, these types of reports have to
> > be considered FUD.
> > 
> > Sigh,
> > Brad
> 
> Jarrett is right.  And it is REALLY difficult to narrow these things down. The
> problem is with these types of bugs, one seemingly unrelated change makes the
> whole thing start working, so I bet a lot of these types of things go
> unreported (as he said, who wants to paste a 25k line program to bugzilla?
> It'll just get ignored).
> 
> Here is one I stumbled across while helping someone debug Tango's filesystem
> abstraction.  This is the smallest I could get it to (took me about 2 hours to
> narrow it down).  I'd really appreciate if Walter or whoever would fix this
> one:
> 
> http://d.puremagic.com/issues/show_bug.cgi?id=2232
> 
> -Steve 

Trust me, I'm _well_ aware of the difficulty.  I'm also just as aware that 
saying it's buggy will never result in a bug being fixed.  Reports, such 
as yours, will.  Thanks for going through the effort of trimming it down 
to something relatively small.

I've tracked down bugs in quite a few different compilers over the years, 
in code bases much much larger than talked about in this thread.  It's a 
pain, but it's important.  I've also tracked down bugs that I coulda sworn 
were compiler bugs but turned out to be my own bugs.  Until you do the 
work, you can't ever be sure.

Ok Walter, don't make a liar outta me.. go look at Steve's report. :)

Thanks,
Brad


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