Self-hosted code is JavaScript code that SpiderMonkey uses to implement some of its intrinsic functions for JavaScript. Because it is written in JavaScript, it gets all the benefits of our JITs, like inlining and inline caches.

SpiderMonkey is the JavaScript engine used in Mozilla Firefox and other Mozilla products. Readers can learn about JavaScript language features, engine internals, and performance optimizations. With documentation, blog posts, and developer tools, SpiderMonkey provides resources for JavaScript developers and browser engine enthusiasts.

SpiderMonkey

Self-hosted code in SpiderMonkey is JavaScript used to implement intrinsic functions, benefiting from just-in-time compilation. Changes require building to take effect. Debugging can be done using dbg(), and specification step comments in the codebase can aid in implementation. The getSelfHostedValue() function helps explore self-hosted functions. Developers can also define their own self-hosted functions for use in JS Shell and XPC shell.

5 Things You Might Not Know about Developing Self-Hosted Code

1. When you change self-hosted code, you need to build

5. You can define your own self-hosted functions