Function current_state_is_favored

hail-fuzz/src/queue.rs:506–534

Determine whether the current input is smaller than an existing entry in the queue that is favored for a particular bit.

(
    state: &mut State,
    store: &mut CorpusStore<MultiStream>,
)

/// Determine whether the current input is smaller than an existing entry in the queue that is
/// favored for a particular bit.
pub(crate) fn current_state_is_favored(
    state: &mut State,
    store: &mut CorpusStore<MultiStream>,
) -> bool {
    let len = state.input.total_bytes();
    let mut improvement = false;
    for idx in &state.hit_coverage {
        let best = store.coverage_hits[idx]
            .iter()
            .map(|id| (id, &store.test_cases[*id].metadata))
            .min_by_key(|(_, metadata)| metadata.len);

        let Some((id, metadata)) = best
        else {
            tracing::warn!("No existing input for {idx:#x} but input was not considered new");
            return true;
        };

        if len as f32 * 1.1f32 < metadata.len as f32 {
            tracing::debug!(
                "new input length {len} is better than existing best input id={id}, len={}, for bit={idx:#x}",
                metadata.len
            );
            state.new_bits.push(*idx);
            improvement = true;
        }
    }
    improvement
}

static GLOBAL_ID: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(0);