Why isn't GDB designed and implemented by using Object-Oriented methodology?

[xingxing pan]

When meeting so many structs and function pointer in the source codes,
dose anyone have the thought to redesign and implement GDB using
Object-Oriented  methodology?
Since one of the debugger's functions is to slow down the execution of
the debugee, implementing GDB by using Object-Oriented  language will
not observably affect the performance.

Open Source is a good idea. But it seems open the process of design is
much more important. After all, the development of a software is a
process, not just only a result presented by the source codes.With the
source codes, one can hardly see the design process.