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Home > Programming > Application Development > LLVM Essentials
LLVM Essentials
LLVM Essentials

LLVM Essentials: Become familiar with the LLVM infrastructure and start using LLVM libraries to design a compiler

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LLVM Essentials

Chapter 2. Building LLVM IR

A high level programming language facilitates human interaction with the target machine. Most of the popular high level languages today have certain basic elements such as variables, loops, if-else decision making statements, blocks, functions, and so on. A variable holds value of data types; a basic block gives an idea of the scope of the variable. An if-else decision statement helps in selection of a path of code. A function makes a block of code reusable. High level languages may vary in type checking, type casting, variable declarations, complex data types, and so on. However, almost every other language has the basic building blocks listed earlier in this section.

A language may have its own parser which tokenizes the statement and extracts meaningful information such as identifier, its data type; a function name, its declaration, definition and calls; a loop condition, and so on. This meaningful information may be stored in a data structure where...

Creating an LLVM module

In the previous chapter, we got an idea as to how an LLVM IR looks. In LLVM, a module represents a single unit of code that is to be processed together. An LLVM module class is the top-level container for all other LLVM IR objects. The LLVM module contains global variables, functions, data layout, host triples, and so on. Let's create a simple LLVM module.

LLVM provides Module() constructor for creating a module. The first argument is the name of the module. The second argument is LLVMContext. Let's get these arguments in the main function and create a module as demonstrated here:

static LLVMContext &Context = getGlobalContext();
static Module *ModuleOb = new Module("my compiler", Context);

For these functions to work, we need to include certain header files:

#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
using namespace llvm;
static LLVMContext &Context = getGlobalContext();
static Module *ModuleOb = new...

Emitting a function in a module

Now that we have created a module, the next step is to emit a function. LLVM has an IRBuilder class that is used to generate LLVM IR and print it using the dump function of the Module object. LLVM provides the class llvm::Function to create a function and llvm::FunctionType() to associate a return type for the function. Let's assume that our foo() function returns an integer type.

Function *createFunc(IRBuilder<> &Builder, std::string Name) {
  FunctionType *funcType = llvm::FunctionType::get(Builder.getInt32Ty(), false);
  Function *fooFunc = llvm::Function::Create(
      funcType, llvm::Function::ExternalLinkage, Name, ModuleOb);
  return fooFunc;
}

Finally, call function verifyFunction() on fooFunc. This function performs a variety of consistency checks on the generated code, to determine if our compiler is doing everything right.

int main(int argc, char *argv[]) {
  static IRBuilder<> Builder(Context);
  Function *fooFunc = createFunc...

Adding a block to a function

A function consists of basic blocks. A basic block has an entry point. A basic block consists of a number of IR instructions, the last instruction being a terminator instruction. It has single exit point. LLVM provides the BasicBlock class to create and handle basic blocks. A basic block might have an entry point as its label, which indicates where to insert the next instructions. We can use the IRBuilder object to hold these new basic block IR.

BasicBlock *createBB(Function *fooFunc, std::string Name) {
  return BasicBlock::Create(Context, Name, fooFunc);
}

The overall code is as follows:

#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include <vector>
using namespace llvm;

static LLVMContext &Context = getGlobalContext();
static Module *ModuleOb = new Module("my compiler", Context);

Function *createFunc(IRBuilder<> &amp...

Emitting a global variable

Global variables have visibility of all the functions within a given module. LLVM provides the GlobalVariable class to create global variables and set its properties such as linkage type, alignment, and so on. The Module class has the method getOrInsertGlobal() to create a global variable. It takes two arguments—the first is the name of the variable and the second is the data type of the variable.

As global variables are part of a module, we create global variables after creating the module. Insert the following code just after creating the module in toy.cpp:

GlobalVariable *createGlob(IRBuilder<> &Builder, std::string Name) {
  ModuleOb->getOrInsertGlobal(Name, Builder.getInt32Ty());
  GlobalVariable *gVar = ModuleOb->getNamedGlobal(Name);
  gVar->setLinkage(GlobalValue::CommonLinkage);
  gVar->setAlignment(4);
  return gVar;
}

Linkage is what determines if multiple declarations of the same object refer to the same object, or to separate...

Emitting a return statement

A function might return a value or it may return void. Here in our example, we have defined that our function returns an integer. Let's assume that our function returns 0. The first step is to get a 0 value, which can be done using the Constant class.

Builder.CreateRet(Builder.getInt32(0));

The overall code is as follows:

#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include <vector>
using namespace llvm;

static LLVMContext &Context = getGlobalContext();
static Module *ModuleOb = new Module("my compiler", Context);

Function *createFunc(IRBuilder<> &Builder, std::string Name) {
  FunctionType *funcType = llvm::FunctionType::get(Builder.getInt32Ty(), false);
  Function *fooFunc = llvm::Function::Create(
      funcType, llvm::Function::ExternalLinkage, Name, ModuleOb);
  return fooFunc;
}

BasicBlock *createBB(Function...

Creating an LLVM module

In the previous chapter, we got an idea as to how an LLVM IR looks. In LLVM, a module represents a single unit of code that is to be processed together. An LLVM module class is the top-level container for all other LLVM IR objects. The LLVM module contains global variables, functions, data layout, host triples, and so on. Let's create a simple LLVM module.

LLVM provides Module() constructor for creating a module. The first argument is the name of the module. The second argument is LLVMContext. Let's get these arguments in the main function and create a module as demonstrated here:

static LLVMContext &Context = getGlobalContext();
static Module *ModuleOb = new Module("my compiler", Context);

For these functions to work, we need to include certain header files:

#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
using namespace llvm;
static LLVMContext &Context = getGlobalContext();
static Module *ModuleOb = new Module("my compiler", Context);

int main...

Emitting a function in a module

Now that we have created a module, the next step is to emit a function. LLVM has an IRBuilder class that is used to generate LLVM IR and print it using the dump function of the Module object. LLVM provides the class llvm::Function to create a function and llvm::FunctionType() to associate a return type for the function. Let's assume that our foo() function returns an integer type.

Function *createFunc(IRBuilder<> &Builder, std::string Name) {
  FunctionType *funcType = llvm::FunctionType::get(Builder.getInt32Ty(), false);
  Function *fooFunc = llvm::Function::Create(
      funcType, llvm::Function::ExternalLinkage, Name, ModuleOb);
  return fooFunc;
}

Finally, call function verifyFunction() on fooFunc. This function performs a variety of consistency checks on the generated code, to determine if our compiler is doing everything right.

int main(int argc, char *argv[]) {
  static IRBuilder<> Builder(Context);
  Function *fooFunc = createFunc(Builder...

Adding a block to a function

A function consists of basic blocks. A basic block has an entry point. A basic block consists of a number of IR instructions, the last instruction being a terminator instruction. It has single exit point. LLVM provides the BasicBlock class to create and handle basic blocks. A basic block might have an entry point as its label, which indicates where to insert the next instructions. We can use the IRBuilder object to hold these new basic block IR.

BasicBlock *createBB(Function *fooFunc, std::string Name) {
  return BasicBlock::Create(Context, Name, fooFunc);
}

The overall code is as follows:

#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include <vector>
using namespace llvm;

static LLVMContext &Context = getGlobalContext();
static Module *ModuleOb = new Module("my compiler", Context);

Function *createFunc(IRBuilder<> &Builder, std::string Name) {
  FunctionType *funcType...

Emitting a global variable

Global variables have visibility of all the functions within a given module. LLVM provides the GlobalVariable class to create global variables and set its properties such as linkage type, alignment, and so on. The Module class has the method getOrInsertGlobal() to create a global variable. It takes two arguments—the first is the name of the variable and the second is the data type of the variable.

As global variables are part of a module, we create global variables after creating the module. Insert the following code just after creating the module in toy.cpp:

GlobalVariable *createGlob(IRBuilder<> &Builder, std::string Name) {
  ModuleOb->getOrInsertGlobal(Name, Builder.getInt32Ty());
  GlobalVariable *gVar = ModuleOb->getNamedGlobal(Name);
  gVar->setLinkage(GlobalValue::CommonLinkage);
  gVar->setAlignment(4);
  return gVar;
}

Linkage is what determines if multiple declarations of the same object refer to the same object, or to separate ones...

Emitting a return statement

A function might return a value or it may return void. Here in our example, we have defined that our function returns an integer. Let's assume that our function returns 0. The first step is to get a 0 value, which can be done using the Constant class.

Builder.CreateRet(Builder.getInt32(0));

The overall code is as follows:

#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include <vector>
using namespace llvm;

static LLVMContext &Context = getGlobalContext();
static Module *ModuleOb = new Module("my compiler", Context);

Function *createFunc(IRBuilder<> &Builder, std::string Name) {
  FunctionType *funcType = llvm::FunctionType::get(Builder.getInt32Ty(), false);
  Function *fooFunc = llvm::Function::Create(
      funcType, llvm::Function::ExternalLinkage, Name, ModuleOb);
  return fooFunc;
}

BasicBlock *createBB(Function *fooFunc, std::string Name) {
  return BasicBlock...
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Page 1 of 11

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Key benefits

  • Learn to use the LLVM libraries to emit intermediate representation (IR) from high-level language
  • Build your own optimization pass for better code generation
  • Understand AST generation and use it in a meaningful way

Description

LLVM is currently the point of interest for many firms, and has a very active open source community. It provides us with a compiler infrastructure that can be used to write a compiler for a language. It provides us with a set of reusable libraries that can be used to optimize code, and a target-independent code generator to generate code for different backends. It also provides us with a lot of other utility tools that can be easily integrated into compiler projects. This book details how you can use the LLVM compiler infrastructure libraries effectively, and will enable you to design your own custom compiler with LLVM in a snap. We start with the basics, where you’ll get to know all about LLVM. We then cover how you can use LLVM library calls to emit intermediate representation (IR) of simple and complex high-level language paradigms. Moving on, we show you how to implement optimizations at different levels, write an optimization pass, generate code that is independent of a target, and then map the code generated to a backend. The book also walks you through CLANG, IR to IR transformations, advanced IR block transformations, and target machines. By the end of this book, you’ll be able to easily utilize the LLVM libraries in your own projects.

Who is this book for?

This book is intended for those who already know some of the concepts of compilers and want to quickly get familiar with the LLVM infrastructure and the rich set of libraries that it provides.

What you will learn

  • Get an introduction to LLVM modular design and LLVM tools
  • Convert frontend code to LLVM IR
  • Implement advanced LLVM IR paradigms
  • Understand the LLVM IR Optimization Pass Manager infrastructure and write an optimization pass
  • Absorb LLVM IR transformations
  • Understand the steps involved in converting LLVM IR to Selection DAG
  • Implement a custom target using the LLVM infrastructure
  • Get a grasp of C's frontend clang, an AST dump, and static analysis

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Dec 21, 2015
Length: 166 pages
Edition : 1st
Language : English
ISBN-13 : 9781785280801
Category :
Programming
Languages :
C++
Concepts :
Application Development
Tools :
LLVM

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Product Details

Publication date : Dec 21, 2015
Length: 166 pages
Edition : 1st
Language : English
ISBN-13 : 9781785280801
Category :
Programming
Languages :
C++
Concepts :
Application Development
Tools :
LLVM

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Table of Contents

8 Chapters
1. Playing with LLVM Chevron down icon Chevron up icon
1. Playing with LLVM
Modular design and collection of libraries
Getting familiar with LLVM IR
LLVM tools and using them in the command line
Summary
2. Building LLVM IR Chevron down icon Chevron up icon
2. Building LLVM IR
Creating an LLVM module
Emitting a function in a module
Adding a block to a function
Emitting a global variable
Emitting a return statement
Emitting function arguments
Emitting a simple arithmetic statement in a basic block
Emitting if-else condition IR
Emitting LLVM IR for loop
Summary
3. Advanced LLVM IR Chevron down icon Chevron up icon
3. Advanced LLVM IR
Memory access operations
Getting the address of an element
Reading from the memory
Writing into a memory location
Inserting a scalar into a vector
Extracting a scalar from a vector
Summary
4. Basic IR Transformations Chevron down icon Chevron up icon
4. Basic IR Transformations
Opt Tool
Pass and Pass Manager
Using other Pass info in current Pass
Instruction simplification example
Instruction Combining
Summary
5. Advanced IR Block Transformations Chevron down icon Chevron up icon
5. Advanced IR Block Transformations
Loop processing
Scalar evolution
LLVM intrinsics
Vectorization
Summary
6. IR to Selection DAG phase Chevron down icon Chevron up icon
6. IR to Selection DAG phase
Converting IR to selectionDAG
Legalizing SelectionDAG
Optimizing SelectionDAG
Instruction Selection
Scheduling and emitting machine instructions
Register allocation
Code Emission
Summary
7. Generating Code for Target Architecture Chevron down icon Chevron up icon
7. Generating Code for Target Architecture
Sample backend
Implementing frame lowering
Lowering instructions
Printing an instruction
Summary
Index Chevron down icon Chevron up icon
Index

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Amazon Customer Sep 02, 2016
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
I knew nothing about LLVM and was going to start playing with it. The web has too much information for a rookie and the book just saved me some time in learning.
Amazon Verified review Amazon
Amazon Customer Jul 24, 2017
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
this helps you to grasp the basic of LLVM in 3 hours.
Amazon Verified review Amazon
Gideon Buckwalter Jan 29, 2019
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Overall not bad, but the version of LLVM this book uses is somewhat out of date, so a lot of the examples did not compile without tweaking. The major focus of the book is on the C++ API for building IR code and optimization passes. I was hoping this would be a language reference for the intermediate representation, but it is not.I also noticed a surprising number of grammar mistakes which is unfortunate. Hopefully these will be fixed in the next edition.
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poorna shashank May 10, 2019
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Half of the book is filled with repititive code. Lots of the pages are redundant. I would have loved if he explained how a syntax is related to a concept in theory.Examples are very basic. Not recommended if you know compiler basics, llvm web documentation is better
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David Lamkins Nov 15, 2018
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Poorly edited: inconsistent use of terminology, tortured grammar, unclear and poorly-explained examples. way too much repetition, etc.
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About the 4 authors

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Profile icon Suyog Sarda
Suyog Sarda
Suyog Sarda is a professional software engineer and an open source enthusiast. He focuses on compiler development and compiler tools. He is an active contributor to the LLVM open source community. Suyog was also involved in code performance improvements for the ARM and X86 architectures. He has been a part of the compiler team for the Tizen project. His interest in compiler development lies more in code optimization and vectorization. Previously, he has authored a book on LLVM, titled LLVM Cookbook by Packt Publishing. Apart from compilers, Suyog is also interested in Linux Kernel Development. He has published a technical paper titled Secure Co-resident Virtualization in Multicore Systems by VM Pinning and Page Coloring at the IEEE Proceedings of the 2012 International Conference on Cloud Computing, Technologies, Applications, and Management at the Birla Institute of Technology, Dubai. He has earned a bachelor's degree in computer technology from the College of Engineering, Pune, India.
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Profile icon John Criswell
John Criswell
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Profile icon Mayur Pandey
Mayur Pandey
Mayur Pandey is a professional software engineer and open source enthusiast focused on compiler development and tools. He is an active contributor to the LLVM open source community. He has been a part of the compiler team for the Tizen project and has hands-on experience of other proprietary compilers. He has earned a bachelor's degree in Information Technology from Motilal Nehru National Institute of Technology, Allahabad, India. Currently, he lives in Bengaluru, India.
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Profile icon David Farago
David Farago
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