Some confusing code of the kernel

[Yuxin Ren]

Thank you very much.
But how can I know which file is compiled?


On Wed, May 28, 2014 at 6:55 AM, Adam Lackorzynski <
adam at os.inf.tu-dresden.de> wrote:

> Hi,
>
> On Tue May 27, 2014 at 13:51:31 -0800, Yuxin Ren wrote:
> > Now I am learning the kernel code of Fiasco.
> > But as I do not know much about C++, I feel confused about some code.
>
> Some C++ knowledge is required I think...
>
> > In the file obj_space-virt.cpp, we have such code
> > EXTENSION class Generic_obj_space :
> Obj_space_virt<Generic_obj_space<SPACE>
> > >
> >
> > And similarly, in the file obj_space-phys.cpp, we have
> > EXTENSION class Generic_obj_space : Obj_space_phys<Generic_obj_space<
> SPACE
> > > >
> >
> > 1. What's the meaning of these tow line code? Does it mean that the class
> > Generic_obj_space
> > inherit from both class Obj_space_virt and class Obj_space_phys?
>
> It inherits from just Obj_space_phys which however takes another class
> as a parameter to implement some specific functionality at compile time.
>
> > 2. I note that class Obj_space_virt and Obj_space_phys have some methods
> > with the same name,
> > such as lookup_local method. When such a method is called, how can I know
> > which class is invoked?
>
> That depends on the type of the object the method is called on. In this
> particular case with obj_space-*.cpp, only one file of the two files is
> compiled, so only one version of Generic_obj_space can ever exist.
>
>
>
> Adam
> --
> Adam                 adam at os.inf.tu-dresden.de
>   Lackorzynski         http://os.inf.tu-dresden.de/~adam/
>
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