Python: fixed gen, lookup, and mimc7

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "chiquito"
-version = "0.1.2023070800"
+version = "0.1.2023091000"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 authors = ["Leo Lara <[email protected]>"]

examples/mimc7.py

@@ -0,0 +1,29 @@
+from __future__ import annotations
+
+from chiquito.dsl import Circuit, StepType
+from chiquito.cb import eq, table
+from chiquito.util import F
+
+from chiquito.rust_chiquito import convert_and_print_ast
+
+from mimc7_constants import ROUND_KEYS
+
+ROUNDS = 91
+
+
+class Mimc7Constants(Circuit):
+    def setup(self):
+        self.pragma_num_steps(ROUNDS)
+        self.lookup_row = self.fixed("constant row")
+        self.lookup_c = self.fixed("constant value")
+        self.new_table(table().add(self.lookup_row).add(self.lookup_c))
+
+    def fixed_gen(self):
+        for i, round_key in enumerate(ROUND_KEYS):
+            self.assign(i, self.lookup_row, F(i))
+            self.assign(i, self.lookup_c, F(round_key))
+
+
+mimc7_constants = Mimc7Constants()
+mimc7_constants_json = mimc7_constants.get_ast_json()
+convert_and_print_ast(mimc7_constants_json)

examples/mimc7_constants.py

@@ -0,0 +1,93 @@
+ROUND_KEYS = [
+    0,
+    20888961410941983456478427210666206549300505294776164667214940546594746570981,
+    15265126113435022738560151911929040668591755459209400716467504685752745317193,
+    8334177627492981984476504167502758309043212251641796197711684499645635709656,
+    1374324219480165500871639364801692115397519265181803854177629327624133579404,
+    11442588683664344394633565859260176446561886575962616332903193988751292992472,
+    2558901189096558760448896669327086721003508630712968559048179091037845349145,
+    11189978595292752354820141775598510151189959177917284797737745690127318076389,
+    3262966573163560839685415914157855077211340576201936620532175028036746741754,
+    17029914891543225301403832095880481731551830725367286980611178737703889171730,
+    4614037031668406927330683909387957156531244689520944789503628527855167665518,
+    19647356996769918391113967168615123299113119185942498194367262335168397100658,
+    5040699236106090655289931820723926657076483236860546282406111821875672148900,
+    2632385916954580941368956176626336146806721642583847728103570779270161510514,
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+    10864774797625152707517901967943775867717907803542223029967000416969007792571,
+    10035653564014594269791753415727486340557376923045841607746250017541686319774,
+    3446968588058668564420958894889124905706353937375068998436129414772610003289,
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+    10530777752259630125564678480897857853807637120039176813174150229243735996839,
+    20486583726592018813337145844457018474256372770211860618687961310422228379031,
+    12690713110714036569415168795200156516217175005650145422920562694422306200486,
+    17386427286863519095301372413760745749282643730629659997153085139065756667205,
+    2216432659854733047132347621569505613620980842043977268828076165669557467682,
+    6309765381643925252238633914530877025934201680691496500372265330505506717193,
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+    13602139229813231349386885113156901793661719180900395818909719758150455500533,
+]

src/ast/mod.rs

@@ -1,16 +1,19 @@
 pub mod expr;
 
-use std::{collections::HashMap, fmt::Debug, rc::Rc};
+use std::{collections::HashMap, fmt::Debug, hash::Hash, rc::Rc};
 
 use crate::{
     frontend::dsl::StepTypeHandler,
     util::{uuid, UUID},
-    wit_gen::{FixedGenContext, Trace, TraceContext},
+    wit_gen::{FixedAssignment, FixedGenContext, Trace, TraceContext},
 };
 
 pub use expr::*;
 
-use halo2_proofs::plonk::{Advice, Column as Halo2Column, ColumnType, Fixed};
+use halo2_proofs::{
+    arithmetic::Field,
+    plonk::{Advice, Column as Halo2Column, ColumnType, Fixed},
+};
 
 use self::query::Queriable;
 
@@ -29,7 +32,7 @@ pub struct Circuit<F, TraceArgs> {
     pub annotations: HashMap<UUID, String>,
 
     pub trace: Option<Rc<Trace<F, TraceArgs>>>,
-    pub fixed_gen: Option<Rc<FixedGen<F>>>,
+    pub fixed_assignments: Option<FixedAssignment<F>>,
 
     pub first_step: Option<StepTypeUUID>,
     pub last_step: Option<StepTypeUUID>,
@@ -42,10 +45,19 @@ pub struct Circuit<F, TraceArgs> {
 impl<F: Debug, TraceArgs: Debug> Debug for Circuit<F, TraceArgs> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         f.debug_struct("Circuit")
+            .field("step_types", &self.step_types)
             .field("forward_signals", &self.forward_signals)
+            .field("shared_signals", &self.shared_signals)
+            .field("fixed_signals", &self.fixed_signals)
             .field("halo2_advice", &self.halo2_advice)
-            .field("step_types", &self.step_types)
+            .field("halo2_fixed", &self.halo2_fixed)
+            .field("exposed", &self.exposed)
             .field("annotations", &self.annotations)
+            .field("fixed_assignments", &self.fixed_assignments)
+            .field("first_step", &self.first_step)
+            .field("last_step", &self.last_step)
+            .field("num_steps", &self.num_steps)
+            .field("q_enable", &self.q_enable)
             .finish()
     }
 }
@@ -66,7 +78,7 @@ impl<F, TraceArgs> Default for Circuit<F, TraceArgs> {
             annotations: Default::default(),
 
             trace: None,
-            fixed_gen: None,
+            fixed_assignments: None,
 
             first_step: None,
             last_step: None,
@@ -167,23 +179,24 @@ impl<F, TraceArgs> Circuit<F, TraceArgs> {
         }
     }
 
-    pub fn set_fixed_gen<D>(&mut self, def: D)
-    where
-        D: Fn(&mut FixedGenContext<F>) + 'static,
-    {
-        match self.fixed_gen {
-            None => self.fixed_gen = Some(Rc::new(def)),
-            Some(_) => panic!("circuit cannot have more than one fixed generator"),
-        }
-    }
-
     pub fn get_step_type(&self, uuid: UUID) -> Rc<StepType<F>> {
         let step_rc = self.step_types.get(&uuid).expect("step type not found");
 
         Rc::clone(step_rc)
     }
 }
 
+impl<F: Field + Hash, TraceArgs> Circuit<F, TraceArgs> {
+    pub fn set_fixed_assignments(&mut self, assignments: Option<FixedAssignment<F>>) {
+        match self.fixed_assignments {
+            None => {
+                self.fixed_assignments = assignments;
+            }
+            Some(_) => panic!("circuit cannot have more than one fixed generator"),
+        }
+    }
+}
+
 pub type FixedGen<F> = dyn Fn(&mut FixedGenContext<F>) + 'static;
 
 pub type StepTypeUUID = UUID;
@@ -450,7 +463,7 @@ impl FixedSignal {
     }
 }
 
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, Debug)]
 pub enum ExposeOffset {
     First,
     Last,

src/frontend/dsl/mod.rs

@@ -4,10 +4,13 @@ use crate::{
     wit_gen::{FixedGenContext, StepInstance, TraceContext},
 };
 
-use halo2_proofs::plonk::{Advice, Column as Halo2Column, Fixed};
+use halo2_proofs::{
+    arithmetic::Field,
+    plonk::{Advice, Column as Halo2Column, Fixed},
+};
 
 use core::fmt::Debug;
-use std::marker::PhantomData;
+use std::{hash::Hash, marker::PhantomData};
 
 use self::{
     cb::{Constraint, Typing},
@@ -133,17 +136,6 @@ impl<F, TraceArgs> CircuitContext<F, TraceArgs> {
         self.circuit.set_trace(def);
     }
 
-    /// Sets the fixed generation function for the circuit. The fixed generation function is
-    /// responsible for assigning fixed values to fixed columns. It is entirely left
-    /// for the user to implement and is Turing complete. Users typically generate cell values and
-    /// call the `assign` function to fill the fixed columns.
-    pub fn fixed_gen<D>(&mut self, def: D)
-    where
-        D: Fn(&mut FixedGenContext<F>) + 'static,
-    {
-        self.circuit.set_fixed_gen(def);
-    }
-
     pub fn new_table(&self, table: LookupTableStore<F>) -> LookupTable {
         let uuid = table.uuid();
         self.tables.add(table);
@@ -172,6 +164,27 @@ impl<F, TraceArgs> CircuitContext<F, TraceArgs> {
     }
 }
 
+impl<F: Field + Hash, TraceArgs> CircuitContext<F, TraceArgs> {
+    /// Sets the fixed generation function for the circuit. The fixed generation function is
+    /// responsible for assigning fixed values to fixed columns. It is entirely left
+    /// for the user to implement and is Turing complete. Users typically generate cell values and
+    /// call the `assign` function to fill the fixed columns.
+    pub fn fixed_gen<D>(&mut self, def: D)
+    where
+        D: Fn(&mut FixedGenContext<F>) + 'static,
+    {
+        if self.circuit.num_steps == 0 {
+            panic!("circuit must call pragma_num_steps before calling fixed_gen");
+        }
+        let mut ctx = FixedGenContext::new(self.circuit.num_steps);
+        (def)(&mut ctx);
+
+        let assignments = Some(ctx.get_assignments());
+
+        self.circuit.set_fixed_assignments(assignments);
+    }
+}
+
 pub enum StepTypeDefInput {
     Handler(StepTypeHandler),
     String(&'static str),