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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

Cross-compiling with Clang command-line arguments

Now that you know each toolchain component, we will show you how to use Clang as a cross-compiler by using the appropriate driver arguments.

Note

All the examples in this section are tested in an x86_64 machine running Ubuntu 12.04. We use Ubuntu-specific tools to download some dependencies, but the Clang-related commands should work in any other OS environment without (or with minor) modifications.

Driver options for the target

Clang uses the –target=<triple> driver option to dynamically select the target triple for which code needs to be generated. Beyond the triple, other options can be used to make target selection more accurate:

  • The -march=<arch> option selects the target base architecture. The examples of the <arch> values include armv4t, armv6, armv7, and armv7f for ARM and mips32, mips32r2, mips64, and mips64r2 for MIPS. This option alone also selects a default base CPU to be used in the code generator.

  • To select a specific...

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