[webkit-dev] Webkit JavaScript question

[Lucius Fox]

Hi,

Can you please tell me what is the difference between
ByteCodeGenerator.h and JIT.h?

I assume ByteCodeGenerator is convert a raw .js file into JavaScript
VM opecode and will be executed by Webkit JavaScript VM.
and JIT convert a raw .js file into native machine code and will be
executed by operating system of the browser?

Is that correct?
If yes, when/how does Webkit decide to use which approach?