NekoVM

NekoVM
Mark Knol · MIT · source
Name	NekoVM

NekoVM NekoVM is a lightweight virtual machine and programming language runtime designed to execute bytecode and enable dynamic language interoperability. It was created to serve as an intermediate representation and execution engine for high-level languages, facilitating cross-platform deployment and embedding in systems that require compact runtime footprints. NekoVM has been used alongside several language implementations and tooling projects to provide scripting, web backend, and embedded runtime capabilities.

Overview

NekoVM functions as a stack-based virtual machine with a compact bytecode format, a garbage-collected heap, and a set of primitives for IO and reflection. Influences and parallels can be traced to virtual machines and projects such as Java Virtual Machine, BEAM (Erlang VM), Lua (programming language), CPython, V8 (JavaScript engine), Mono (software), Parrot (virtual machine), JavaScriptCore, HotSpot, Dalvik, ART (Android Runtime), WASM (WebAssembly), LLVM, Smalltalk, Scheme (programming language), Common Lisp, Ruby (programming language), PHP, Perl, Tcl, .NET Framework, GraalVM, Racket, Squeak, SEAL (software), Erlang (programming language), Haxe (programming language), ActionScript, Adobe Flash, Common Intermediate Language, OCaml, Haskell, F#, Scala, Kotlin.

History and Development

NekoVM emerged during a period of experimentation with portable runtimes and language virtualization, contemporaneous with work on Haxe (programming language), GWT, Google V8, Mozilla Rhino, Apache Harmony, OpenJDK, LLVM Project, Squeak Smalltalk, Alice (software), Mono (software), Wine (software), CPython, Lua (programming language), Perl 6 (Raku), Ruby (programming language), PHP, Node.js, Duktape, Parrot (virtual machine), Ericsson, Sun Microsystems, Oracle Corporation, Google, Mozilla Foundation, Facebook, Microsoft Corporation, Apple Inc., Samsung Electronics, Intel Corporation, ARM Holdings, Red Hat, Canonical (company).

Development focused on compactness, embeddability, and smooth integration with source languages and compilers. Contributors and maintainers interacted with communities around Haxe (programming language), GitHub, SourceForge, Bitbucket, GNU General Public License, MIT License, BSD licenses, Apache License, Eclipse Foundation, Linux Foundation, Free Software Foundation, Open Source Initiative, Mozilla Public License, Creative Commons.

Architecture and Components

NekoVM's architecture centers on a bytecode interpreter, a garbage collector, an object model, and IO primitives. Comparable components exist in Java Virtual Machine, BEAM (Erlang VM), CPython, V8 (JavaScript engine), Mono (software), HotSpot, LLVM, Parrot (virtual machine), Dalvik, ART (Android Runtime), WebKit, Node.js, QuickJS, Duktape, Squirrel (programming language), Lua (programming language), Racket, Scheme (programming language), Smalltalk.

Key subsystems include a bytecode loader, a GC tuned for small heaps akin to collectors in Lua (programming language), a runtime type system for dynamic dispatch resembling mechanisms in Ruby (programming language), and a foreign-function interface similar to those in CPython and Mono (software). Embedding APIs permit integration with hosts such as NGINX, Apache HTTP Server, Lighttpd, IIS, Express (web framework), Flask (web framework), Django, Spring Framework, ASP.NET, Node.js.

Language and Runtime Features

NekoVM exposes dynamic typing, runtime reflection, and first-class functions, features also present in JavaScript, Python (programming language), Ruby (programming language), Lua (programming language), Scheme (programming language), Smalltalk. It supports garbage collection, exceptions, closures, and basic concurrency primitives comparable to those in Erlang (programming language), GHC (Glasgow Haskell Compiler), Go (programming language), Rust (programming language), Java (programming language), C#. The runtime offers interoperability hooks used by language frontends such as Haxe (programming language), enabling compile targets similar to JavaScript, PHP, C++, C#.

IO and networking capabilities leverage patterns akin to libuv, asio (Boost), POSIX, Windows API, and bindings mirror approaches used by Node.js, Twisted (software), Tornado (web server), Nginx Unit.

Tooling and Ecosystem

An ecosystem of compilers, editors, and build tools surrounds NekoVM, intersecting with projects like Haxe (programming language), Visual Studio Code, Sublime Text, Vim, Emacs, Eclipse, IntelliJ IDEA, NetBeans, JetBrains, GitHub, GitLab, Travis CI, CircleCI, Jenkins, Azure DevOps, Docker, Kubernetes, Ansible, Terraform, Homebrew, apt (Debian), rpm (file format), Conda (package manager). Language server and debugging integrations follow models from Language Server Protocol, GDB, LLDB, Valgrind, Strace, Perf (Linux).

Libraries and modules for web development, templating, and database access draw inspiration from Express (web framework), Flask (web framework), Ruby on Rails, Django, Symfony, Laravel, Hibernate, Doctrine (PHP), SQLAlchemy, psycopg2, MySQL, PostgreSQL, SQLite, MongoDB, Redis, Elasticsearch.

Use Cases and Adoption

NekoVM has been adopted in scenarios requiring small footprint scripting, embedding in game engines, and rapid server-side prototyping. Comparable adopters include ecosystems around Love2D, Unity (game engine), Unreal Engine, Godot Engine, Corona SDK, Cocos2d-x, Electron (software framework), NW.js, Apache HTTP Server, NGINX, HAProxy, Lighttpd, IIS, LibreOffice, GIMP, Blender, Inkscape.

Academic and hobbyist users have explored NekoVM for language experimentation similar to work in PLT Scheme, Racket, SML/NJ, OCaml, Haskell (programming language), Clojure, Rust (programming language), Go (programming language), Swift (programming language). Enterprises concerned with embeddable scripting have compared it to Lua (programming language), Duktape, QuickJS, V8 (JavaScript engine), CPython.

Performance and Benchmarks

Performance characteristics of NekoVM typically favor low memory overhead and fast startup relative to heavier VMs such as HotSpot and Mono (software), while raw execution speed can trail optimized JIT VMs like V8 (JavaScript engine) and GraalVM. Benchmarking efforts often reference suites and tooling from SPEC CPU, TechEmpower Framework Benchmarks, Dhrystone, Whetstone, Phoronix Test Suite, Google Octane, JetStream, Kraken (benchmark) to compare throughput, latency, and memory usage against Node.js, Python (programming language), Ruby (programming language), Go (programming language), Rust (programming language), C++, Java (programming language), C#. Profiling and optimization practices draw on techniques used with gprof, perf (Linux), Valgrind, Callgrind, Google Perftools.

Category:Virtual machines