Virtual functions and Kernel Code

[vasdenjas]

Hi,

I'm trying to write a (very) simple kernel in C++ using object orientation. I wanted to implement device drivers using something similar to an "interface" in Java, in other words, and entirely virtual abstract base class. However, when I try to compile any code with virtual functions, it doesn't link. I understand that I will probably have to re-write some of the C++ library, but can someone tell me where to start, and what to look for.

I'm using gcc (g++) version 3.2.2, and ld version 2.13.90

Thanks

[carbonBased]

What's the exact error you get?

I created a _minimal_ C++ run-time implementation for Trion... it does little more then stop LD's complains about missing symbols.

If I recall correctly, the only thing I had to define to get virtual functions working was something like this:

       void __cxa_pure_virtual(void)
        {
                console.WriteLine("Kernel Panic: Calling pure virtual method.");
        }

Which I have defined inside an extern "C" { } block.

I _believe_ that's all you should need.  I have implemented other functions, however, to take care of global constructors and destructors, so if you need any help in those areas, let me know.

These will probably be of use, as well:
        void  __cxa_atexit(void (*arg1)(void*), void* arg2, void* arg3) { }
        void* __dso_handle = &__dso_handle;

Keep in mind, these are all specific to gcc 3.x, and will not satisfy LD with pre 3.x compilers.

Cheers,
Jeff

[vasdenjas]

Hi,

Thanks. Thats exactly what I needed. I thought it was far more complicated.