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  • Book Overview & Buying Getting started with LLVM core libraries
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Getting started with LLVM core libraries

Getting started with LLVM core libraries

By : Bruno Lopes, Auler
4.3 (18)
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Getting started with LLVM core libraries

Getting started with LLVM core libraries

4.3 (18)
By: Bruno Lopes, Auler
Buy this Book

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.
Table of Contents (12 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Build and Install LLVM
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1. Build and Install LLVM
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Understanding LLVM versions
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Obtaining prebuilt packages
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Building from sources
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Summary
2
2. External Projects
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2. External Projects
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Introducing Clang extras
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Using the DragonEgg plugin
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Summary
3
3. Tools and Design
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3. Tools and Design
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Introducing LLVM's basic design principles and its history
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Understanding LLVM today
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Interacting with the compiler driver
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Using standalone tools
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Delving into the LLVM internal design
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Writing your first LLVM project
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Navigating the LLVM source – general advice
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Summary
4
4. The Frontend
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4. The Frontend
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Introducing Clang
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Learning the frontend phases with Clang
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Putting it together
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Summary
5
5. The LLVM Intermediate Representation
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5. The LLVM Intermediate Representation
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Overview
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Exercising basic tools to manipulate the IR formats
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Introducing the LLVM IR language syntax
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Writing a custom LLVM IR generator
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Optimizing at the IR level
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Summary
6
6. The Backend
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6. The Backend
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Overview
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Learning the backend code structure
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Knowing the backend libraries
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Learning how to use TableGen for LLVM backends
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Understanding the instruction selection phase
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Scheduler
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Machine instructions
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Register allocation
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Prologue and epilogue
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Understanding the machine code framework
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Writing your own machine pass
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Summary
7
7. The Just-in-Time Compiler
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7. The Just-in-Time Compiler
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Getting to know the LLVM JIT engine basics
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Introducing the llvm::JIT framework
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Introducing the llvm::MCJIT framework
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Using LLVM JIT compilation tools
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Other resources
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Summary
8
8. Cross-platform Compilation
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8. Cross-platform Compilation
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Comparing GCC and LLVM
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Understanding target triples
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Preparing your toolchain
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Cross-compiling with Clang command-line arguments
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Generating a Clang cross-compiler
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Testing
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Additional resources
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Summary
9
9. The Clang Static Analyzer
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9. The Clang Static Analyzer
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Understanding the role of a static analyzer
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Testing the static analyzer
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Extending the static analyzer with your own checkers
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More resources
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Summary
10
10. Clang Tools with LibTooling
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10. Clang Tools with LibTooling
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Generating a compile command database
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The clang-tidy tool
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Refactoring tools
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Writing your own tool
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More resources
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Summary
11
Index
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Index

Learning the frontend phases with Clang

To transform a source code program into LLVM IR bitcode, there are a few intermediate steps the source code must pass through. The following figure illustrates all of them, and they are the topics of this section:

Learning the frontend phases with Clang

Lexical analysis

The very first frontend step processes the source code's textual input by splitting language constructs into a set of words and tokens, removing characters such as comments, white spaces, and tabs. Each word or token must be part of the language subset, and reserved language keywords are converted into internal compiler representations. The reserved words are defined in include/clang/Basic/TokenKinds.def. For example, see the definition of the while reserved word and the < symbol, two known C/C++ tokens, highlighted in the TokenKinds.def excerpt here:

TOK(identifier)          // abcde123
// C++11 String Literals.
TOK(utf32_string_literal) // U"foo"
…
PUNCTUATOR(r_paren,             ")")
PUNCTUATOR...
CONTINUE READING
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Tech Concepts
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Programming languages
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Getting started with LLVM core libraries
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