Serial class source code link to where - github??

I am unable to find Arduino class Serial source code. ( I found Processing class Serial , but not Arduino)
Google returns everything but plain "class Serial" used in Arduino core code.
Seems silly, but I get "SoftwareSerial", Serial_Arduino, SerialJava and bunch of others no matter how many "exceptions" I specify.
If you know the Github link where up to date source SHOULD be please me know.
Thanks.

here

Delta_G:
That's because there isn't a class Serial. Serial is an instance of the HardwareSerial class.

SOLVED

Thanks, I guess I have given Google wrong instruction.
Just out of curiosity - is there any reference to the HardwareSerial class in Arduino documentation?
I guess I'll look.
Thanks again

is there any reference to the HardwareSerial class in Arduino documentation?

On the far right, near the bottom, is a section called Communication, with Serial and Stream.