Re: CNI & Exception handling

[Bryce McKinlay <mckinlay at redhat dot com>]

Andrew Haley wrote:

> RamrajPrabu Balasubramanian writes:
> > Hi,
> >       The project I'm working on involves writing CNI wrappers to existing 
> > c++ classes that we have. the problem is these c++ classes throw exceptions 
> > and there are a lot of them. I know catching c++ exceptions and rethrowing 
> > them as java exceptions casuses the " mixing java and c++ exceptions in same 
> > translation unit is not  allowed" error.
> >       Getting past this hurdle is very important for us to adopt gcj in our 
> > projects, can some one suggest some ways to handle these c++ exceptions 
> > without changing our existing c++ code ?
>
> The obvious solution is to have a layer that catches C++ exceptions
> and returns appropriate flags.  Another layer, separately compiled,
> can throw Java exceptions.
>  

Andrew,

Do you have an idea of how difficult it would be to relax this 
restriction? Would it be possible to, say, only allow one type of 
exceptions to be *caught* in a given compilation unit? Or, could we make 
libgcj's personality routine handle C++ exceptions as well (for CNI 
code)? Currently, this does seem like a pretty nasty limitation for CNI.

Regards

Bryce