Book Image

Learn LLVM 17 - Second Edition

By : Kai Nacke, Amy Kwan
Book Image

Learn LLVM 17 - Second Edition

By: Kai Nacke, Amy Kwan

Overview of this book

LLVM was built to bridge the gap between the theoretical knowledge found in compiler textbooks and the practical demands of compiler development. With a modular codebase and advanced tools, LLVM empowers developers to build compilers with ease. This book serves as a practical introduction to LLVM, guiding you progressively through complex scenarios and ensuring that you navigate the challenges of building and working with compilers like a pro. The book starts by showing you how to configure, build, and install LLVM libraries, tools, and external projects. You’ll then be introduced to LLVM's design, unraveling its applications in each compiler stage: frontend, optimizer, and backend. Using a real programming language subset, you'll build a frontend, generate LLVM IR, optimize it through the pipeline, and generate machine code. Advanced chapters extend your expertise, covering topics such as extending LLVM with a new pass, using LLVM tools for debugging, and enhancing the quality of your code. You'll also focus on just-in-time compilation issues and the current state of JIT-compilation support with LLVM. Finally, you’ll develop a new backend for LLVM, gaining insights into target description and how instruction selection works. By the end of this book, you'll have hands-on experience with the LLVM compiler development framework through real-world examples and source code snippets.
Table of Contents (20 chapters)
1
Part 1: The Basics of Compiler Construction with LLVM
4
Part 2: From Source to Machine Code Generation
10
Part 3: Taking LLVM to the Next Level
14
Part 4: Roll Your Own Backend

Summary

In this chapter, you learned about creating passes that run beyond instruction selection, specifically exploring the creation behind machine function passes in the backend! You also discovered how to add a new experimental target into clang, and some of the driver, ABI, and toolchain changes that are required. Finally, while considering the supreme discipline of compiler construction, you learned how to cross-compile your application for another target architecture.

Now that we’re at the end of Learn LLVM 17, you are equipped with the knowledge to use LLVM in creative ways in your projects and have explored many interesting topics. The LLVM ecosystem is very active, and new features are added all the time, so be sure to follow its development!

As compiler developers ourselves, it was a pleasure for us to write about LLVM and discover some new features along the way. Have fun with LLVM!