सारस | SARAS

Started with following LLVM's tutorial

Note: This was tested with llvm-libs-17.0.5

In development, a hobby project only

JIT is broken right now, 'jit' branch par code hai uska Compiler work kar raha hai

To actually try, or see usage with sample programs, see go to Practical Usage section after building :)

Meaning of the name 'saras':

S -> Sai

A -> Abhay

R -> Rabin

A -> Aditya Gupta

S -> Salman

Building

First install cmake (to build C++ project) & llvm (IR to machine code)

cmake -B build
cmake --build build

Install

cmake --install build

Use

./build/saras --help
Usage: SARAS [options] 

Optional arguments:
-h --help       shows help message and exits
-v --version    prints version information and exits
-l --lexer      Stop at Lexer, only print Tokens read [default: false]
-p --parser     Stop at Parser stage, saves Abstract Syntax Tree in graph*.png files [default: false]
-ir             Stop at IR stage, prints LLVM Intermediate Representation for all expressions and functions [default: false]
--interactive   DEFAULT, provides an interactive console to type [default: true]

उदाहरण | Examples

# प्रकर मतलब प्रक्रिया

प्रकर विरहंक(क)
    यदि क < 1 तब
        1
    अथवा
       क*विरहंक(क-1)

विरहंक(5)

Tokens

Virhanka Numbers

aka Factorials

# virhanka.saras

fn virhanka(n)
    if n < 1 then
        1
    else
        n*virhanka(n-1)

virhanka(5)

Generated with graphviz, code in visualizer.hpp

Generated LLVM IR:

Generated with llvm-as < t.ll | opt -analyze --enable-new-pm=0 -view-cfg

Practical Usage

This language is very limited currently, and doesn't include support for linking with the C Runtime to be able to actually run standalone program, ie. basically it does not support writing a 'main' function, or a start entry.

So, as of now saras can be used to write small functions, and then be used as a library to use with a C/C++/Rust program etc., which should define the entrypoint.

Look for files inside the programs/ directory to look for examples.

Currently we have a caller code in C, which will call the virhanka (aka. factorial) function defined in 'saras' language syntax. Currently it has saras files such as 'virhanka.saras', 'विरहंक.सारस' etc..

An example set of commands to run these programs:

# First compile saras code to object code
./build/saras -c programs/विरहंक.सारस

# Then compile and link our saras code with caller code written in C
g++ programs/caller_code_hindi.cpp विरहंक.o

# Finally run the program
./a.out

Todo

• https://stackoverflow.com/questions/35526075/llvm-how-to-implement-print-function-in-my-language
• JIT (chap 4)
• Optimisation (chap 4)

Happy Diwali