Developer Builds Closure-Based JIT Compiler to Eliminate AST Interpreter Overhead

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A developer working on V.E.L.O.C.I.T.Y.-OS, a self-described bare-metal operating system project, has published Part 4 of a 12-part technical series detailing the construction of a Just-In-Time compiler. The JIT compiler targets the project's custom Neural Document Architecture language, replacing a recursive tree-walk interpreter that was causing excessive dispatch overhead. Rather than generating native machine code directly, the Tier-1 implementation compiles AST nodes at load-time into chains of nested Rust closures, resolving opcode matches and scope checks before runtime. Variable slots are pre-allocated at load-time so the runtime engine traverses flat function pointer chains instead of performing repeated hash map lookups. The broader roadmap outlines plans for x86-64 code generation, bare-metal drivers, and eventually handing system control to a self-optimizing local language model.

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