WebAssembly Debugging with LLDB

WebAssembly support in Swift started as a community project and became an official part of Swift 6.2. As Swift on WebAssembly matures, developers need robust debugging tools to match. This talk presents our work adding native debugging support for Swift targeting Wasm in LLDB. WebAssembly has some unique characteristics, such as its segmented memory address space, and we'll explore how we made that work with LLDB's architecture. Additionally, we'll cover how extensions to the GDB remote protocol enable debugging across various Wasm runtimes, including the WebAssembly Micro Runtime (WAMR), JavaScriptCore (JSC), and WasmKit.