The book "Project Oberon: The Design of an Operating System and Compiler" http://www.amazon.com/Project-Oberon-Design-Operating-Compiler/dp/0201544288/ref=sr_1_

The book "Project Oberon: The Design of an Operating System and Compiler" http://www.amazon.com/Project-Oberon-Design-Operating-Compiler/dp/0201544288/ref=sr_1_1?ie=UTF8&qid=1366902572&sr=8-1&keywords=project+oberon http://www.amazon.com/Project-Oberon-Design-Operating-Compil... contains a detailed explanation of the design for the Oberon compiler and operating system. Not only it is well written with clear explanations, but it also includes the full source code for the compiler and operating system in less than 550 pages! I learned some interesting compiler techniques from reading that book.