lovm2

Is a lightweight virtual machine with a focus on simplicity and extendability.

Features

• dynamic typing
• generate bytecode using highlevel intermediate representation
• call into shared objects: lovm2_extend
• python bindings: pylovm2
• define own callbacks for interrupts

Generating Bytecode

use lovm2::prelude::*;
use lovm2::vm::Vm;

fn main() {
    let mut main_hir = HIR::new();

    // set the local variable n to 10
    main_hir.push(Assign::local(var!(n), 10));

    // `print` is a builtin function. the `var!` macro
    // ensures that the given identifier is not confused
    // with a string.
    main_hir.push(Call::new("print").arg(var!(n)).arg("Hello World"));
    // ... this is equivalent to the developer-friendly version:
    main_hir.push(call!(print, n, "Hello World"));

    let mut module = ModuleBuilder::new();

    // a module needs a code object called `main`
    // if you want to make it runnable
    module.add("main").hir(main_hir);

    // consumes the `ModuleBuilder` and transforms
    // it into a `Module`
    let module = module.build().unwrap();
    println!("{:#?}", module);

    // load the module and run it
    let mut vm = Vm::new();
    vm.load_and_import_all(module).expect("load error");
    vm.run().expect("run error");
}

Customer Reviews

This Thing Fast - Sonic

And I thought I was simple... - Pythagorean Theorem