Yes, you can define structs and use getelementptr to access values. But, frontends can also bake in offsets calculated from getelementptr. They can also bake in

Yes, you can define structs and use getelementptr to access values. But, frontends can also bake in offsets calculated from getelementptr. They can also bake in sizeofs of structs, for example. And LLVM optimizations end up baking in hardcoded values in more subtle ways too.