use halo2::{
arithmetic::FieldExt,
circuit::{Cell, Layouter, Region, SimpleFloorPlanner},
dev::CircuitLayout,
pasta::Fp,
plonk::{Advice, Circuit, Column, ConstraintSystem, Error, Fixed, TableColumn},
poly::Rotation,
};
use plotters::prelude::*;
use std::marker::PhantomData;
#[allow(clippy::many_single_char_names)]
fn main() {
#[derive(Copy, Clone, Debug)]
pub struct Variable(Column<Advice>, usize);
#[derive(Clone)]
struct PlonkConfig {
a: Column<Advice>,
b: Column<Advice>,
c: Column<Advice>,
d: Column<Advice>,
e: Column<Advice>,
sa: Column<Fixed>,
sb: Column<Fixed>,
sc: Column<Fixed>,
sm: Column<Fixed>,
sl: TableColumn,
}
trait StandardCs<FF: FieldExt> {
fn raw_multiply<F>(
&self,
region: &mut Region<FF>,
f: F,
) -> Result<(Cell, Cell, Cell), Error>
where
F: FnMut() -> Result<(FF, FF, FF), Error>;
fn raw_add<F>(&self, region: &mut Region<FF>, f: F) -> Result<(Cell, Cell, Cell), Error>
where
F: FnMut() -> Result<(FF, FF, FF), Error>;
fn copy(&self, region: &mut Region<FF>, a: Cell, b: Cell) -> Result<(), Error>;
fn lookup_table(
&self,
layouter: &mut impl Layouter<FF>,
values: &[FF],
) -> Result<(), Error>;
}
struct MyCircuit<F: FieldExt> {
a: Option<F>,
lookup_table: Vec<F>,
}
struct StandardPlonk<F: FieldExt> {
config: PlonkConfig,
_marker: PhantomData<F>,
}
impl<FF: FieldExt> StandardPlonk<FF> {
fn new(config: PlonkConfig) -> Self {
StandardPlonk {
config,
_marker: PhantomData,
}
}
}
impl<FF: FieldExt> StandardCs<FF> for StandardPlonk<FF> {
fn raw_multiply<F>(
&self,
region: &mut Region<FF>,
mut f: F,
) -> Result<(Cell, Cell, Cell), Error>
where
F: FnMut() -> Result<(FF, FF, FF), Error>,
{
let mut value = None;
let lhs = region.assign_advice(
|| "lhs",
self.config.a,
0,
|| {
value = Some(f()?);
Ok(value.ok_or(Error::SynthesisError)?.0)
},
)?;
region.assign_advice(
|| "lhs^4",
self.config.d,
0,
|| Ok(value.ok_or(Error::SynthesisError)?.0.square().square()),
)?;
let rhs = region.assign_advice(
|| "rhs",
self.config.b,
0,
|| Ok(value.ok_or(Error::SynthesisError)?.1),
)?;
region.assign_advice(
|| "rhs^4",
self.config.e,
0,
|| Ok(value.ok_or(Error::SynthesisError)?.1.square().square()),
)?;
let out = region.assign_advice(
|| "out",
self.config.c,
0,
|| Ok(value.ok_or(Error::SynthesisError)?.2),
)?;
region.assign_fixed(|| "a", self.config.sa, 0, || Ok(FF::zero()))?;
region.assign_fixed(|| "b", self.config.sb, 0, || Ok(FF::zero()))?;
region.assign_fixed(|| "c", self.config.sc, 0, || Ok(FF::one()))?;
region.assign_fixed(|| "a * b", self.config.sm, 0, || Ok(FF::one()))?;
Ok((lhs, rhs, out))
}
fn raw_add<F>(&self, region: &mut Region<FF>, mut f: F) -> Result<(Cell, Cell, Cell), Error>
where
F: FnMut() -> Result<(FF, FF, FF), Error>,
{
let mut value = None;
let lhs = region.assign_advice(
|| "lhs",
self.config.a,
0,
|| {
value = Some(f()?);
Ok(value.ok_or(Error::SynthesisError)?.0)
},
)?;
region.assign_advice(
|| "lhs^4",
self.config.d,
0,
|| Ok(value.ok_or(Error::SynthesisError)?.0.square().square()),
)?;
let rhs = region.assign_advice(
|| "rhs",
self.config.b,
0,
|| Ok(value.ok_or(Error::SynthesisError)?.1),
)?;
region.assign_advice(
|| "rhs^4",
self.config.e,
0,
|| Ok(value.ok_or(Error::SynthesisError)?.1.square().square()),
)?;
let out = region.assign_advice(
|| "out",
self.config.c,
0,
|| Ok(value.ok_or(Error::SynthesisError)?.2),
)?;
region.assign_fixed(|| "a", self.config.sa, 0, || Ok(FF::one()))?;
region.assign_fixed(|| "b", self.config.sb, 0, || Ok(FF::one()))?;
region.assign_fixed(|| "c", self.config.sc, 0, || Ok(FF::one()))?;
region.assign_fixed(|| "a * b", self.config.sm, 0, || Ok(FF::zero()))?;
Ok((lhs, rhs, out))
}
fn copy(&self, region: &mut Region<FF>, left: Cell, right: Cell) -> Result<(), Error> {
region.constrain_equal(left, right)
}
fn lookup_table(
&self,
layouter: &mut impl Layouter<FF>,
values: &[FF],
) -> Result<(), Error> {
layouter.assign_table(
|| "",
|mut table| {
for (index, &value) in values.iter().enumerate() {
table.assign_cell(|| "table col", self.config.sl, index, || Ok(value))?;
}
Ok(())
},
)?;
Ok(())
}
}
impl<F: FieldExt> Circuit<F> for MyCircuit<F> {
type Config = PlonkConfig;
type FloorPlanner = SimpleFloorPlanner;
fn without_witnesses(&self) -> Self {
Self {
a: None,
lookup_table: self.lookup_table.clone(),
}
}
fn configure(meta: &mut ConstraintSystem<F>) -> PlonkConfig {
let e = meta.advice_column();
let a = meta.advice_column();
let b = meta.advice_column();
let sf = meta.fixed_column();
let c = meta.advice_column();
let d = meta.advice_column();
meta.enable_equality(a.into());
meta.enable_equality(b.into());
meta.enable_equality(c.into());
let sm = meta.fixed_column();
let sa = meta.fixed_column();
let sb = meta.fixed_column();
let sc = meta.fixed_column();
let sl = meta.lookup_table_column();
meta.lookup(|meta| {
let a_ = meta.query_any(a.into(), Rotation::cur());
vec![(a_, sl)]
});
meta.create_gate("Combined add-mult", |meta| {
let d = meta.query_advice(d, Rotation::next());
let a = meta.query_advice(a, Rotation::cur());
let sf = meta.query_fixed(sf, Rotation::cur());
let e = meta.query_advice(e, Rotation::prev());
let b = meta.query_advice(b, Rotation::cur());
let c = meta.query_advice(c, Rotation::cur());
let sa = meta.query_fixed(sa, Rotation::cur());
let sb = meta.query_fixed(sb, Rotation::cur());
let sc = meta.query_fixed(sc, Rotation::cur());
let sm = meta.query_fixed(sm, Rotation::cur());
vec![a.clone() * sa + b.clone() * sb + a * b * sm - (c * sc) + sf * (d * e)]
});
PlonkConfig {
a,
b,
c,
d,
e,
sa,
sb,
sc,
sm,
sl,
}
}
fn synthesize(
&self,
config: PlonkConfig,
mut layouter: impl Layouter<F>,
) -> Result<(), Error> {
let cs = StandardPlonk::new(config);
for i in 0..10 {
layouter.assign_region(
|| format!("region_{}", i),
|mut region| {
let mut a_squared = None;
let (a0, _, c0) = cs.raw_multiply(&mut region, || {
a_squared = self.a.map(|a| a.square());
Ok((
self.a.ok_or(Error::SynthesisError)?,
self.a.ok_or(Error::SynthesisError)?,
a_squared.ok_or(Error::SynthesisError)?,
))
})?;
let (a1, b1, _) = cs.raw_add(&mut region, || {
let fin = a_squared.and_then(|a2| self.a.map(|a| a + a2));
Ok((
self.a.ok_or(Error::SynthesisError)?,
a_squared.ok_or(Error::SynthesisError)?,
fin.ok_or(Error::SynthesisError)?,
))
})?;
cs.copy(&mut region, a0, a1)?;
cs.copy(&mut region, b1, c0)
},
)?;
}
cs.lookup_table(&mut layouter, &self.lookup_table)?;
Ok(())
}
}
let a = Fp::rand();
let instance = Fp::one() + Fp::one();
let lookup_table = vec![instance, a, a, Fp::zero()];
let circuit: MyCircuit<Fp> = MyCircuit {
a: None,
lookup_table,
};
let root = BitMapBackend::new("example-circuit-layout.png", (1024, 768)).into_drawing_area();
root.fill(&WHITE).unwrap();
let root = root
.titled("Example Circuit Layout", ("sans-serif", 60))
.unwrap();
CircuitLayout::default().render(5, &circuit, &root).unwrap();
}