V.E.L.O.C.I.T.Y.-OS: The JIT Compiler Core – From AST to Native Closures (Part 4)

Short summary

Part 4 of a 12-part series on building V.E.L.O.C.I.T.Y.-OS, a bare-metal operating system. This post focuses on implementing a Tier-1 closure-based JIT compiler that replaces tree-walk interpretation by eliminating hash-map variable lookups through pre-allocated slots at compile-time. The author discusses Rust lifetime constraints when accessing persistent databases wrapped in Arc references, which forces atomic reference count clones on every operation.

• •Closure-based JIT compiles AST to nested function chains at load-time, eliminating runtime branch misprediction penalties
• •Variable slots pre-allocated during compilation enable O(1) flat-array lookups instead of hash-map queries
• •Rust Arc-wrapping of database references forces atomic reference count clones on every variable and function-call operation

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