> you can pass integers and pointers around No, not even that (the second thing, passing pointers)! WASM has a different address space (starting from 0), effec

> you can pass integers and pointers around No, not even that (the second thing, passing pointers)! WASM has a different address space (starting from 0), effectively indexing into the WASM module's linear memory. A pointer/reference from the outside env can not be dereferenced from within the WASM bytecode. The multiple linear memory proposal can circumvent this (allowing you to build something somewhat similar to a simple MMU/address translation engine), but language support for that feature is sparse (AFAIK, Rust does not expose any way to access a different than the default linear memory for example). There is various hacks around it, but sharing memory block-wise between WASM and outside env is involved already.