How does one write system-level tools such as debuggers and profilers by reflection?

Reflection makes it easy to write system-level tools such as debuggers and profilers.

I know that C debuggers uses the ptrace syscall to implement themselves.

How can one implement a debugger by reflection?

UPDATE

What's the principle to implemen开发者_高级运维t a debugger with reflection?

Do you have a specific use case for writing your own java debugger?

Java comes with a debugger, jdb. There are plenty of debugger interfaces out there that are very powerful that can be run locally and remotely. In a development environment, most IDEs (eclipse, intelliJ, NetBeans, ...etc) have built-in debugger interfaces that provide excellent functionality and use jdb.