Implementation Details

[Ruby The Roobster via Digitalmars-d-learn]

As of late, I have taken up an interest in learning about how the 
D language is implemented at a compiler level, specifically the 
GC implementation.  Unfortunately, the source code is poorly 
documented, and is too large to simply read all of it in a 
reasonable amount of time.  If anyone here can help me, or at 
least point me to relevant resources, I would be very grateful.