Locate the Serial library code in Arduino 1.0 IDE

Hi all,
as I write in the title I'm interested to locate the code Arduino 1.0 uses when I call a generic Serial.*** function.
I need to know how Serial.flush() is implemented in the latest IDE. I've found the releases notes but after reading the Reference page I'm a bit confused, so the curiosity to read the source code!

thanks

The Serial object is an instance of the HardwareSerial class, which is derived from the Stream class now.

The flush() function used to empty the incoming serial data buffer. Now, it blocks until all pending output data has been sent.

The Serial object is an instance of the HardwareSerial class

That's what I was looking for!
Thank you very much!