Book Image

Learn LLVM 12

By : Kai Nacke
Book Image

Learn LLVM 12

By: Kai Nacke

Overview of this book

LLVM was built to bridge the gap between compiler textbooks and actual compiler development. It provides a modular codebase and advanced tools which help developers to build compilers easily. This book provides a practical introduction to LLVM, gradually helping you navigate through complex scenarios with ease when it comes to building and working with compilers. You’ll start by configuring, building, and installing LLVM libraries, tools, and external projects. Next, the book will introduce you to LLVM design and how it works in practice during each LLVM compiler stage: frontend, optimizer, and backend. Using a subset of a real programming language as an example, you will then learn how to develop a frontend and generate LLVM IR, hand it over to the optimization pipeline, and generate machine code from it. Later chapters will show you how to extend LLVM with a new pass and how instruction selection in LLVM works. You’ll also focus on Just-in-Time compilation issues and the current state of JIT-compilation support that LLVM provides, before finally going on to understand how to develop a new backend for LLVM. By the end of this LLVM book, you will have gained real-world experience in working with the LLVM compiler development framework with the help of hands-on examples and source code snippets.
Table of Contents (17 chapters)
Section 1 – The Basics of Compiler Construction with LLVM
Section 2 – From Source to Machine Code Generation
Section 3 –Taking LLVM to the Next Level


In this chapter, you learned how to apply various sanitizers. You detected pointer errors with the address sanitizer, uninitialized memory access with the memory sanitizer, and detected data races with the thread sanitizer. Application errors are often triggered by malformed input, and you implemented fuzz testing to test your application with random data.

You instrumented your application with XRay to identify the performance bottlenecks, and you also learned about the various ways to visualize data. In this chapter, you also used the Clang Static Analyzer to find possible errors through interpretation of the source, and you learned how to build your own Clang plugin.

These skills will help you to raise the quality of the applications you build. It is certainly good to find runtime errors before your application users complain about them. Applying the knowledge gained in this chapter, you can not only find a wide range of common errors but also extend Clang with new...