[LLVMdev] isa and friends as an alternative to dynamic cast?

[Reid Spencer]

My understanding is that EH works fine without RTTI. However, we use
typeid in LLVM in a few limited spots like lib/VMCore/Pass.cpp

Reid.

On Sat, 2005-04-23 at 20:12 -0700, Jeff Cohen wrote:
> As far as I can tell, exceptions work just fine without RTTI when using 
> gcc 3.4.2.  dynamic_cast, on the hand, crashes without RTTI (no 
> compilation error or warning is generated).
> 
> Jeff Cohen wrote:
> 
> > This may be the case with GCC, but VC++ allows exception handling to 
> > be enabled while RTTI is disabled.  According to VC++ documentation, 
> > RTTI is needed only to support dynamic_cast, the typeid operator, and 
> > the type_info class.
> >
> > Chris Lattner wrote:
> >
> >> On Thu, 21 Apr 2005, Jeff Cohen wrote:
> >>
> >>> That's a good point.
> >>
> >>
> >>
> >> I think there are some issues with doing this (e.g. EH doesn't work, 
> >> so the very few places we use it would have to be modified), but 
> >> other than that I fully support the idea.
> >>
> >> -Chris
> >
> >
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> >
> >
> 
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