Support for EOP 'enhanced orthogonal persistence'

[Kamirus]

As I was testing the debugger with the unreleased version of moc I've encountered the following error when starting the debugger via dfx debug my.wasm

[2025-07-14T13:09:05Z WARN  wasmi_debugger::debugger] memory64 must be enabled for 64-bit memories (at offset 0x78a)
memory64 must be enabled for 64-bit memories (at offset 0x78a)
exit code: Some(0)

This is probably due to the fact that the --enhanced-orthogonal-persistence moc flag is on by default (not released yet, but soon), which uses WASM 64bit. More on EOP in the docs.
moc versions higher than 0.14.14 can use the --legacy-persistence flag to restore the original behavior, but this is a temporary measure as the support for the classical persistence will be phased out.

Is the debugger limited to 32bit only?

[hapeeeeee]

I’m not sure about this issue. The motoko_debugger project was originally running on the virtual machine provided by https://github.com/wasmi-labs/wasmi at that time.

Back then, the code included the following lines:

 assert!(
     !memory_type.memory64,
     "wasmi does not support the `memory64` Wasm proposal"
 );
 assert!(
     !memory_type.shared,
     "wasmi does not support the `threads` Wasm proposal"
 );

But in the current version of the project, only this remains:

assert!(
    !memory_type.shared,
    "wasmi does not support the `threads` Wasm proposal"
);

You can see this in https://github.com/wasmi-labs/wasmi/blob/d73abed8de82131092e6f536ce3bffb7d2cc433d/crates/wasmi/src/module/utils.rs

So perhaps the current wasmi project already supports 64-bit Wasm files?
This question needs further confirmation, but if wasmi already supports it, then I think it will be quite easy for us to add support too.