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

Chapter 11: Debugging Using LLVM Tools

LLVM comes with a set of tools that helps you to identify certain errors in your application. All of these tools make use of the LLVM and Clang libraries.

In this chapter, you will learn how to instrument an application with sanitizers, how to use the most common sanitizer to identify a wide range of bugs, and how to implement fuzz testing for your application. This will help you to identify bugs that are usually not found with unit testing. You will also learn how to identify performance bottlenecks in your application, running the static analyzer to identify problems normally not found by the compiler, and creating your own Clang-based tool with which you can extend Clang with new functionality.

This chapter will cover the following topics:

  • Instrumenting an application with sanitizers
  • Finding bugs with libFuzzer
  • Performance profiling with XRay
  • Checking the source with the Clang Static Analyzer
  • Creating your own...