LLVM Techniques, Tips, and Best Practices

LLVM Techniques, Tips, and Best Practices
PDF, ePUB

Book Description
Learn how you can build the next big programming language, compiler, or source code analyzer using LLVM and Clang

Key Features

  • Explore Clang, LLVM’s middle-end and backend, in a pragmatic way
  • Develop your LLVM skillset and get to grips with a variety of common use cases
  • Engage with real-world LLVM development through various coding examples

Book Description

Every programmer or engineer, at some point in their career, works with compilers for optimizing their applications. Compilers convert a high-level programming language into low-level machine-executable code. LLVM provides the infrastructure, reusable libraries, and tools needed for developers to build their own compilers. With LLVM's extensive set of tooling, you can effectively generate code for different backends as well as optimize them.
In this book, you'll explore the LLVM compiler infrastructure and understand how to use it to solve different problems. You'll start by looking at the structure and design philosophy of important components in LLVM and gradually move on to using Clang libraries to build tools that help you analyze high-level source code. As you advance, the book will show you how to process LLVM IR – a powerful way to transform and optimize the source program for various purposes. Equipped with this knowledge, you'll be able to leverage LLVM and Clang to create a wide range of useful programming language tools, including compilers, interpreters, IDEs, and source code analyzers.
By the end of this LLVM book, you'll have developed the skills to create powerful tools using the LLVM framework to overcome different real-world challenges.

What you will learn

  • Find out how LLVM’s build system works and how to reduce the building resources
  • Get to grips with running custom testing with LLVM’s LIT framework
  • Build different types of plugins and extensions for Clang
  • Customize Clang’s toolchain and compiler flags
  • Write LLVM passes for the new PassManager
  • Discover how to inspect and modify LLVM IR
  • Understand how to use LLVM’s PGO (profile-guided optimizations) framework
  • Create custom compiler sanitizers

Who This Book Is For

This book is for software engineers of all experience levels who work with LLVM. If you are an academic researcher, this book will help you learn useful LLVM skills in a short time and enable you to build your prototypes and projects quickly. Programming language enthusiasts will also find this book useful for building a new programming language with the help of LLVM.

Content

Section 1: Build System and LLVM-Specific Tooling
1. Saving Resources When Building LLVM
2. Exploring LLVM's Build System Features
3. Testing with LLVM LIT
4. TableGen Development

Section 2: Frontend Development
5. Exploring Clang's Architecture
6. Extending the Preprocessor
7. Handling AST
8. Working with Compiler Flags and Toolchains

Section 3: "Middle-End" Development
9. Working with PassManager and AnalysisManager
10. Processing LLVM IR
11. Gearing Up with Support Utilities
12. Learning LLVM IR Instrumentation

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