Function log_wasm

crates/fuzzing/src/oracles.rs:54–79

Logs a wasm file to the filesystem to make it easy to figure out what wasm was used when debugging.

(wasm: &[u8])

/// Logs a wasm file to the filesystem to make it easy to figure out what wasm
/// was used when debugging.
pub fn log_wasm(wasm: &[u8]) {
    super::init_fuzzing();

    if !log::log_enabled!(log::Level::Debug) {
        return;
    }

    let i = CNT.fetch_add(1, SeqCst);
    let name = format!("testcase{i}.wasm");
    std::fs::write(&name, wasm).expect("failed to write wasm file");
    log::debug!("wrote wasm file to `{name}`");
    let wat = format!("testcase{i}.wat");
    match wasmprinter::print_bytes(wasm) {
        Ok(s) => {
            std::fs::write(&wat, s).expect("failed to write wat file");
            log::debug!("wrote wat file to `{wat}`");
        }
        // If wasmprinter failed remove a `*.wat` file, if any, to avoid
        // confusing a preexisting one with this wasm which failed to get
        // printed.
        Err(e) => {
            log::debug!("failed to print to wat: {e}");
            drop(std::fs::remove_file(&wat));
        }
    }
}

/// The `T` in `Store<T>` for fuzzing stores, used to limit resource
/// consumption during fuzzing.