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🚀 LLVM Sauce

LLVM Sauce is a yummy Source to LLVM IR compiler. More specifically, it implements a frontend that takes in a Source program and outputs LLVM Intermediate Representation (IR). This IR can then be optimized, interpreted or compiled further with other tools.

A technical specification for the compiler can be found at here.

Features

Getting Started

System Requirements

  • A 64 bit Linux System

Notes:

  • Currently build and tested on Ubuntu 20.04.1, Debian Buster, NixOS 20.09 with LLVM 10.0.0.
  • Windows and MacOS are currently unsupported due to CMake dependencies on llvm-node.

Installing System Dependencies

System Dependencies:

  • LLVM Framework (technically any version should work)
  • Nodejs
  • Yarn
  • G++
  • CMake

Refer to this seperate guide on installing all the necessary system dependencies including the LLVM framework on an Ubuntu VM.

Refer to this seperate guide on installing system dependencies using Nix.

Setup

  1. Clone repository to your local file system
  2. Enter the project directory
  3. Install node dependencies
  4. Build project
  5. Run tests to ensure that everything is working!
$ git clone https://github.com/jiachen247/llvm-sauce.git
$ cd llvm-sauce
$ yarn install
$ yarn build

Compiling a Source file

After installation you can compile a Source program with the following command (substitute program.js for the file containing the program to be compiled):

$ node ./dist/index.js program.js

Note the following available compiler flags:

  • -o FILE , output=FILE: Write LLVM target LLVM IR bytecode to a file specified by FILE
  • -t , --tco: Optimize tail recursive calls to respect ES6 PTC semantics
  • -p , --printAST: Prints the Abstract Syntax Tree (AST) generated by the parser
  • -h , --help:

For example, to turn on tail call optimization use the follow command:

$ node ./dist/index.js --tco program.js

Running LLVM IR

Once you have compiled your program to LLVM IR, LLVM has two ways of running this IR by interpreting or compiling it further to machine code.

LLVM Interpreter (lli)

You can use lli by running the following:

$ node ./dist/index.js program.js -o program.ll
$ lli program.ll

LLVM Compiler (llc)

You can use llc by running the following:

$ node ./dist/index.js program.js -o program.ll
$ llc program.ll -O3  -o program.s
$ g++ --std=c++11 -no-pie program.s -o program
$ ./program

You can specify -O1, -O2, or -O3 to specify the llc optimization level.

Development Guide

In this section is some information that might be helpful for developers who want to contribute to the project.

Application Structure

The ./src folder is laid out in the following way:

├── codegen
│   ├── codegen.ts          // main codegen entry point
│   ├── constants.ts
│   ├── expression          // codegen for each expression grammar rule
│   │   ├── bop.ts
│   │   ├── call.ts
│   │   ├── identifier.ts
│   │   ├── literal.ts
│   │   ├── ternary.ts
│   │   └── uop.ts
│   ├── helper.ts            // contains utility and shared helper functions
│   ├── statement            // codegen for each statement grammar rule
│   │   ├── assignment.ts
│   │   ├── block.ts
│   │   ├── expression.ts
│   │   ├── function.ts
│   │   ├── ifelse.ts
│   │   ├── program.ts
│   │   └── return.ts
│   └── tailcall.ts           // contains tail call optimizations
├── context
│   └── environment.ts
├── index.ts                  // entry point into the program   
├── runtime                   // builds the compiler runtime
│   └── runtime.ts
└── types
    └── types.ts

Testing

Test cases can be found under ./tests with the source files as well as the generated IR. Tests consist comprehensive set of custom test cases we developed as well as examples from SICP chapter 1.

Run Custom Test Cases

To run custom test cases, run the following:

$ yarn test

To generate LLVM IR for the custom test cases to be checked into github run:

$ yarn generate-ir

Run SICP Test Cases

To run examples from chapter 1 of SICP (adapted from JS-Slang), run the following:

$ yarn test-sicp

Formatting ts files

To format all the TypeScript files under ./src run:

$ yarn format