nbp/holyjit

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1554 stars · 28 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

HolyJit is a generic-purpose Just-In-Time compiler library for Rust that extends the Rust compiler (as a rustc driver) to convert annotated interpreter code into JIT-compiled code. It lets developers write an ordinary Rust interpreter and annotate functions with a `jit!` macro to generate optimized JIT code without writing assembly.

Use cases

• build a JIT compiler for my scripting language written in Rust
• speed up an interpreter without writing assembly
• annotate Rust functions to be inlined into JIT-compiled code
• avoid the security pitfalls of hand-written JIT compilers
• reduce startup time of a JIT with macro-guided early compilation tiers

When to choose

• you are writing an interpreter in Rust and want JIT performance with minimal extra code
• you want a safe, high-level alternative to writing a MacroAssembler-based JIT
• you can adopt a rustc wrapper build workflow

When to avoid

• you need a maintained, production-ready JIT (last release 2019, project appears inactive)
• your code is not written in Rust
• you need JIT for a language runtime not built as a Rust interpreter

Facets

library · maturity abandoned

compiler interpreter developer-tools programming-languages compilers developer-tools performance rust cross-platform jit rustc-driver interpreter-optimization macro-annotations linux macos

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