https://www3.nd.edu/~dthain/compilerbook/

Introduction to Compilers and Language Design

A free online textbook by Douglas Thain

A compiler translates a program written in a high level language into
a program written in a lower level language. For students of computer
science, building a compiler from scratch is a rite of passage: a
challenging and fun project that offers insight into many different
aspects of computer science, some deeply theoretical, and others
highly practical.

This book offers a one semester introduction into compiler
construction, enabling the reader to build a simple compiler that
accepts a C-like language and translates it into working X86 or ARM
assembly language. It is most suitable for undergraduate students who
have some experience programming in C, and have taken courses in data
structures and computer architecture.

This is a free online textbook: you are welcome to access the chapter
PDFs directly below. If you prefer to hold a real book, you can also
purchase a hardcover or paperback below. The textbook and materials
have been developed by Prof. Douglas Thain as part of the CSE 40243
compilers class at the University of Notre Dame. Join our mailing
list to receive occasional announcements of new editions and other
updates.

                   Douglas Thain,
                   Introduction to Compilers and Language Design,
                   2nd edition, 2020. (Revision Date: January 15,
Book Cover (2nd    2021)
edition)           http://compilerbook.org

                   Paperback ISBN: 979-8-655-18026-0

                   Buy Paperback via Amazon

                   Douglas Thain,
                   Introduction to Compilers and Language Design,
                   1st edition, 2019.
                   http://compilerbook.org
Book Cover (1st
edition)           Hardcover ISBN: 978-0-359-13804-3
                   Paperback ISBN: 978-0-359-14283-5

                   Buy Hardcover at Lulu
                   Buy Paperback at Lulu
                   Buy Paperback at Amazon

The author grants permission to download, print, and use these PDFs
for personal and academic use. Commercial printing or distribution is
prohibited. Instead of copying PDFs locally, please point students to
this page (compilerbook.org) so that they can access the latest
version.

Introduction to Compilers and Language Design
Second Edition
(Single PDF Download)

Chapter 0   Front Matter
Chapter 1   Introduction
Chapter 2   A Quick Tour
Chapter 3   Scanning
Chapter 4   Parsing
Chapter 5   Parsing in Practice
Chapter 6   The Abstract Syntax Tree
Chapter 7   Semantic Analysis
Chapter 8   Intermediate Representation
Chapter 9   Memory Organization
Chapter 10  Assembly Language
Chapter 11  Code Generation
Chapter 12  Optimization
Appendix A  Sample Course Project
Appendix B  The B-Minor Language
Appendix C  Coding Conventions

Code Resources. The compilerbook-examples github repository contains
additional resources that correspond to the book, including several
scanners and parsers, a starter code structure for the project
compiler, and sample test cases for each stage of the scanner,
parser, typechecker, and code generator.
Errata. Found a typo or mistake? Please send an email to the author
dthain at nd dot edu with the title "Compiler Book Errata" and I'll
be happy to correct it and acknowledge you in the next edition.