Function from_java_class

wasmtime-jni/src/wasm_value.rs:459–489

(
    env: &JNIEnv<'j>,
    clazz: JClass<'j>,
    for_return: bool,
)

}

pub(crate) fn from_java_class<'j>(
    env: &JNIEnv<'j>,
    clazz: JClass<'j>,
    for_return: bool,
) -> Result<Option<WasmTy>, Error> {
    if clazz.is_null() {
        return Ok(None); // FIXME: this should be an exception, right?
    }

    let voidp: JClass = env.get_static_field(VOID, PRIMITIVE, CLASS)?.l()?.into();

    let ty: WasmTy = match clazz {
        _ if env.is_assignable_from(clazz, I64)? => ValType::I64.into(),
        _ if env.is_assignable_from(clazz, I32)? => ValType::I32.into(),
        _ if env.is_assignable_from(clazz, F64)? => ValType::F64.into(),
        _ if env.is_assignable_from(clazz, F32)? => ValType::F32.into(),
        _ if env.is_assignable_from(clazz, WASM_VOID)? => return Ok(None),
        _ if env.is_assignable_from(clazz, VOID)? => return Ok(None),
        _ if env.is_assignable_from(clazz, voidp)? => return Ok(None),
        _ => {
            let name = get_class_name(env, clazz)?;
            if !for_return {
                return Err(anyhow!("Unsupported Java class as argument: {}", name));
            } else {
                return Err(anyhow!("Unsupported Java class as result: {}", name));
            }
        }
    };

    Ok(Some(ty))
}

pub(crate) fn from_java<'j, 'b: 'j>(
    env: &'b JNIEnv<'j>,