Function function_interposition

tests/all/linker.rs:97–126

()

#[test]
#[cfg_attr(miri, ignore)]
fn function_interposition() -> Result<()> {
    let mut store = Store::<()>::default();
    let mut linker = Linker::new(store.engine());
    linker.allow_shadowing(true);
    let mut module = Module::new(
        store.engine(),
        r#"(module (func (export "green") (result i32) (i32.const 7)))"#,
    )?;
    for _ in 0..4 {
        let instance = linker.instantiate(&mut store, &module)?;
        let green = instance.get_export(&mut store, "green").unwrap().clone();
        linker.define(&mut store, "red", "green", green)?;
        module = Module::new(
            store.engine(),
            r#"(module
                (import "red" "green" (func (result i32)))
                (func (export "green") (result i32) (i32.mul (call 0) (i32.const 2)))
            )"#,
        )?;
    }
    let instance = linker.instantiate(&mut store, &module)?;
    let func = instance
        .get_export(&mut store, "green")
        .unwrap()
        .into_func()
        .unwrap();
    let func = func.typed::<(), i32>(&store)?;
    assert_eq!(func.call(&mut store, ())?, 112);
    Ok(())
}

// Same as `function_interposition`, but the linker's name for the function
// differs from the module's name.