Struct halo2_frontend::dev::TracingFloorPlanner

pub struct TracingFloorPlanner<P: FloorPlanner> { /* private fields */ }

A helper type that augments a FloorPlanner with [tracing] spans and events.

TracingFloorPlanner can be used to instrument your circuit and determine exactly what is happening during a particular run of keygen or proving. This can be useful for identifying unexpected non-determinism or changes to a circuit.

No stability guarantees

The tracing output is intended for use during circuit development. It should not be considered production-stable, and the precise format or data exposed may change at any time.

Examples

use halo2_middleware::ff::Field;
use halo2_frontend::{
    circuit::{floor_planner, Layouter, Value},
    dev::TracingFloorPlanner,
    plonk::{Circuit, ConstraintSystem, Error},
};

impl<F: Field> Circuit<F> for MyCircuit<F> {
    // Wrap `TracingFloorPlanner` around your existing floor planner of choice.
    //type FloorPlanner = floor_planner::V1;
    type FloorPlanner = TracingFloorPlanner<floor_planner::V1>;

    // The rest of your `Circuit` implementation is unchanged.
    type Config = MyConfig;

    #[cfg(feature = "circuit-params")]
    type Params = ();

    fn without_witnesses(&self) -> Self {
        Self { some_witness: Value::unknown() }
    }

    fn configure(meta: &mut ConstraintSystem<F>) -> Self::Config {
        // ..
    }

    fn synthesize(&self, config: Self::Config, layouter: impl Layouter<F>) -> Result<(), Error> {
        // ..
    }
}

#[test]
fn some_circuit_test() {
    // At the start of your test, enable tracing.
    tracing_subscriber::fmt()
        .with_max_level(tracing::Level::DEBUG)
        .with_ansi(false)
        .without_time()
        .init();

    // Now when the rest of the test runs, you will get `tracing` output for every
    // operation that the circuit performs under the hood!
}

Trait Implementations

impl<P: Debug + FloorPlanner> Debug for TracingFloorPlanner<P>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<P: FloorPlanner> FloorPlanner for TracingFloorPlanner<P>

fn synthesize<F: Field, CS: Assignment<F> + SyncDeps, C: Circuit<F>>( cs: &mut CS, circuit: &C, config: C::Config, constants: Vec<Column<Fixed>> ) -> Result<(), Error>

Given the provided cs, synthesize the given circuit.