waffle/fuzz/fuzz_targets/roundtrip.rs

#![no_main]
use libfuzzer_sys::fuzz_target;

use waffle::{FrontendError, Module};

fuzz_target!(|module: wasm_smith::Module| {
    let _ = env_logger::try_init();
    log::debug!("original module: {:?}", module);
    let orig_bytes = module.to_bytes();
    let mut parsed_module = match Module::from_wasm_bytes(&orig_bytes[..]) {
        Ok(m) => m,
        Err(e) => {
            match e.downcast::<FrontendError>() {
                Ok(FrontendError::UnsupportedFeature(_)) | Ok(FrontendError::TooLarge(_)) => {
                    // Just skip this case.
                    return;
                }
                Ok(e) => {
                    panic!("Frontend error: {:?}", e);
                }
                Err(e) => {
                    panic!("Other error when parsing module: {:?}", e);
                }
            }
        }
    };
    parsed_module.expand_all_funcs().unwrap();
    parsed_module.optimize();
    let _ = parsed_module.to_wasm_bytes();
});