Merge WASM Files

[al3xfischer]

Summary

Is there any API to add a function from an other module?

Additional Details

I'm trying to merge two WASM files. In the first step, I want to merge the functions, but I'm not able to add the function from the module_b to the module_a. As use can see below, I'm using module.funcs.add_local but the method is expecting a LocalFunction but I didn't find a way to extract the function as a LocalFunction nor did I figure out a way to create it from the Function. I'm using add_local because I didn't find any other method that allowed me to add a new function to a module.

Is there an API for my use case, or is this currently not supported? (Or am I missing something?.. )

Thanks in advance

use anyhow::Error;
use walrus::*;

fn main() -> Result<(), Error> {
    let module_a = Module::from_file("fancy.wasm")?;

    let module_b = Module::from_file("add.wasm")?;
    //  module_b constians only one func
    let my_fancy_func = module_b.funcs.iter().next().unwrap();

    // let module_a.funcs.add(my_fancy_func)
    // mismachted types exepected struct 'LocalFunction', found 'walrus::Function'
    module_a.funcs.add_local(*my_fancy_func);
    
    Ok(())
}

[deltanedas]

i know this is year late but you can match on function.kind and you get FunctionKind::Local(LocalFunction)

the hard part is making sure all the local and what not play nice in the combined wasm which i have not yet managed