nan-boxing

Single-pass SSA bytecode compiler and threaded-code stack VM for a Python subset. NaN-boxed values, inline caching, super-instruction fusion, pure-function memoization, mark-sweep GC, interpreter snapshots, and coverage-guided fuzzing. Runs in the browser as a WebAssembly module, or in the CLI as a script, a standalone binary, or a pool of workers.

• Updated Sep 1, 2026
• Rust

望舒 Wangshu — A high-performance embeddable Lua 5.1 VM in pure Go (no cgo): NaN-boxing, arena GC, inline caches, coroutines, and a tiered method JIT (interpreter → wasm → native amd64/arm64). Up to 17x faster than gopher-lua on numeric kernels, byte-equal with PUC Lua 5.1.5.

• Updated Sep 8, 2026
• Go

NaN boxing in Zig

• Updated Jan 30, 2025
• Zig

Tracing JIT compiler for the Wren scripting language

• Updated Aug 14, 2026
• C

A demonstration of NaN boxing for runtime type checking

• Updated Aug 27, 2023
• C

恋语——中文编程语言 | LLVM JIT/AOT 工业级性能 | 开源免费

• Updated Jun 29, 2026
• C

r8e — r(unmachin)e: A secure, minimal JavaScript engine in 166KB. ES2023 compliant. No JIT. Deterministic GC. Five-layer security. Built-in UI rendering.

• Updated Mar 26, 2026
• C

A from-scratch, ahead-of-time JavaScript/TypeScript to WebAssembly compiler in Rust — swc frontend, a small enum IR, wasm-encoder codegen, wasmtime runtime. No JIT, no interpreter.

• Updated Jul 21, 2026
• Rust

Rust-syntax scripting language with a register-based VM, generational GC, coroutines, and C++20 embedding API — designed for game engine integration

• Updated Apr 4, 2026
• C++

Experimental Forth-like VM using doubles and NaN-boxing as data representation.

• Updated Apr 10, 2013
• C