Technology

Copy-and-Patch: A Copy-and-Patch Tutorial

Source

Hacker News

Published

Oct 14, 2025

TL;DR

AI Generated

The article introduces Copy-and-Patch Compilation, a method for fast runtime code compilation. It involves writing stencils in C to implement operations, compiling them into native code, and then copying and patching the code back into a C file for execution. The tutorial demonstrates creating a JIT compilation engine to specialize a function for computing 1 + 2 at runtime. By using stencils and JIT compilation, the article showcases a method for dynamic code generation and execution. The process involves defining stencils, copying and patching code, and creating a JIT function to generate specialized code.

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