Bytecode-to-Source Mapping
Summary
This article explains how a VM maps bytecode back to source lines, covering strategies like a parallel lines array, run-length encoding, and starting-offset predecessor structures. It discusses trade-offs in memory usage and lookup performance, includes runnable code for a binary-search approach, and compares how JVM and Lua handle line number information. A practical read for developers building interpreters, debuggers, or related tooling.