How to Do Hot Code Loading at Runtime When All You're Doing Is Generating Machine Instructions

A lot of hot code swapping, where you make a change to your source file and the running program updates, is just done in dynamic languages. But zig is all about compiling the binaries and not having an interpreter or any kind of virtual machine at runtime. So how do you do hot code loading when all you're doing is generating machine instructions? You don't have any kind of interpreter running atruntime.