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Getting started with LLVM core libraries

By : Bruno Lopes, Auler

4.3 (18)

Getting started with LLVM core libraries

4.3 (18)

By: Bruno Lopes, Auler

Overview of this book

In today’s fast-paced world of change, companies expect you to do more, with less. Drawing on over a decade of Change Management experience as a consultant with Fortune 500 companies including IBM and NCR, Emily Carr shares the secrets to making change happen smoothly.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Build and Install LLVM

1. Build and Install LLVM

Understanding LLVM versions

Obtaining prebuilt packages

Building from sources

Summary

2. External Projects

2. External Projects

Introducing Clang extras

Using the DragonEgg plugin

Summary

3. Tools and Design

3. Tools and Design

Introducing LLVM's basic design principles and its history

Understanding LLVM today

Interacting with the compiler driver

Using standalone tools

Delving into the LLVM internal design

Writing your first LLVM project

Navigating the LLVM source – general advice

Summary

4. The Frontend

4. The Frontend

Introducing Clang

Learning the frontend phases with Clang

Putting it together

Summary

5. The LLVM Intermediate Representation

5. The LLVM Intermediate Representation

Overview

Exercising basic tools to manipulate the IR formats

Introducing the LLVM IR language syntax

Writing a custom LLVM IR generator

Optimizing at the IR level

Summary

6. The Backend

6. The Backend

Overview

Learning the backend code structure

Knowing the backend libraries

Learning how to use TableGen for LLVM backends

Understanding the instruction selection phase

Scheduler

Machine instructions

Register allocation

Prologue and epilogue

Understanding the machine code framework

Writing your own machine pass

Summary

7. The Just-in-Time Compiler

7. The Just-in-Time Compiler

Getting to know the LLVM JIT engine basics

Introducing the llvm::JIT framework

Introducing the llvm::MCJIT framework

Using LLVM JIT compilation tools

Other resources

Summary

8. Cross-platform Compilation

8. Cross-platform Compilation

Comparing GCC and LLVM

Understanding target triples

Preparing your toolchain

Cross-compiling with Clang command-line arguments

Generating a Clang cross-compiler

Testing

Additional resources

Summary

9. The Clang Static Analyzer

9. The Clang Static Analyzer

Understanding the role of a static analyzer

Testing the static analyzer

Extending the static analyzer with your own checkers

More resources

Summary

10. Clang Tools with LibTooling

10. Clang Tools with LibTooling

Generating a compile command database

The clang-tidy tool

Refactoring tools

Writing your own tool

More resources

Summary

Index

Index

Chapter 2. External Projects

Projects that live outside the core LLVM and Clang repositories need to be separately downloaded. In this chapter, we introduce a variety of other official LLVM projects and explain how to build and install them. Readers only interested in core LLVM tools may skip this chapter or come back when required.

In this chapter, we will cover what are and how to install the following projects:

Clang extra tools
Compiler-RT
DragonEgg
LLVM test suite
LLDB
libc++

Beyond the projects covered in this chapter, there are two official LLVM projects outside the scope of this book: Polly, the polyhedral optimizer, and lld, the LLVM linker, which is currently in development.

Prebuilt binary packages do not include any of the external projects presented in this chapter, except for Compiler-RT. Therefore, unlike the previous chapter, we will only cover techniques that involve downloading the source code and build them ourselves.

Do not expect the same level of maturity as that of...

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