[LLVMdev] isa and friends as an alternative to dynamic cast?
reid at x10sys.com
Sat Apr 23 20:22:33 PDT 2005
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
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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