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Simplified witness computation #837

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Simplified witness computation #837

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243 changes: 151 additions & 92 deletions src/base/runners.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -6,11 +6,11 @@ module Make
(Checked : Checked_intf.Extended with type field = Backend.Field.t)
(As_prover : As_prover0.Extended with type field := Backend.Field.t)
(Runner : Checked_runner.S
with module Types := Checked.Types
with type field := Backend.Field.t
and type cvar := Backend.Cvar.t
and type constr := Backend.Constraint.t option
and type r1cs := Backend.R1CS_constraint_system.t) =
with module Types := Checked.Types
with type field := Backend.Field.t
and type cvar := Backend.Cvar.t
and type constr := Backend.Constraint.t option
and type r1cs := Backend.R1CS_constraint_system.t) =
struct
open Backend

Expand Down Expand Up @@ -97,6 +97,42 @@ struct
R1CS_constraint_system.finalize system ) ;
(aux, true_output)

let auxiliary_input_simplified
?system
~run
~num_inputs
t0
(input : Field.Vector.t)
~return_typ:(Types.Typ.Typ return_typ)
~output : Field.Vector.t =
let next_auxiliary = ref num_inputs in
let aux = Field.Vector.create () in
let state =
Runner.State.make
?system
~num_inputs
~input:(pack_field_vec input)
~next_auxiliary
~aux:(pack_field_vec aux)
~with_witness:true
~eval_constraints:false
()
in
let state, res = run t0 state in
let res, _ = return_typ.var_to_fields res in
let output, _ = return_typ.var_to_fields output in
let _state =
Array.fold2_exn ~init:state res output ~f:(fun state res output ->
Field.Vector.emplace_back input (Runner.get_value state res) ;
fst @@ Checked.run (Checked.assert_equal res output) state )
in
Option.iter system ~f:(fun system ->
let auxiliary_input_size = !next_auxiliary - num_inputs in
R1CS_constraint_system.set_auxiliary_input_size system
auxiliary_input_size ;
R1CS_constraint_system.finalize system ) ;
aux

let run_and_check_exn' ~run t0 =
let num_inputs = 0 in
let input = field_vec () in
Expand All @@ -118,9 +154,9 @@ struct
let run_and_check' ~run t0 =
match run_and_check_exn' ~run t0 with
| exception e ->
Or_error.of_exn ~backtrace:`Get e
Or_error.of_exn ~backtrace:`Get e
| res ->
Ok res
Ok res

let run_and_check_deferred_exn' ~map ~run t0 =
let num_inputs = 0 in
Expand All @@ -147,9 +183,9 @@ struct
~run t0
with
| exception e ->
return (Or_error.of_exn ~backtrace:`Get e)
return (Or_error.of_exn ~backtrace:`Get e)
| res ->
res
res

let run_unchecked ~run t0 =
let num_inputs = 0 in
Expand Down Expand Up @@ -187,18 +223,18 @@ struct
v

let collect_input_constraints :
type checked input_var input_value.
int ref
-> input_typ:
( input_var
, input_value
, field
, (unit, field) Checked.Types.Checked.t )
type checked input_var input_value.
int ref
-> input_typ:
( input_var
, input_value
, field
, (unit, field) Checked.Types.Checked.t )
Types.Typ.typ
-> return_typ:_ Types.Typ.t
-> (unit -> input_var -> checked)
-> _ * (unit -> checked) Checked.t =
fun next_input ~input_typ:(Typ input_typ) ~return_typ:(Typ return_typ) k ->
-> return_typ:_ Types.Typ.t
-> (unit -> input_var -> checked)
-> _ * (unit -> checked) Checked.t =
fun next_input ~input_typ:(Typ input_typ) ~return_typ:(Typ return_typ) k ->
(* allocate variables for the public input and the public output *)
let open Checked in
let alloc_input
Expand All @@ -223,19 +259,19 @@ struct
(retval, circuit)

let r1cs_h :
type a checked input_var input_value retval.
run:(a, checked) Runner.run
-> int ref
-> input_typ:
( input_var
, input_value
, field
, (unit, field) Checked.Types.Checked.t )
type a checked input_var input_value retval.
run:(a, checked) Runner.run
-> int ref
-> input_typ:
( input_var
, input_value
, field
, (unit, field) Checked.Types.Checked.t )
Types.Typ.typ
-> return_typ:(a, retval, _, _) Types.Typ.t
-> (input_var -> checked)
-> R1CS_constraint_system.t =
fun ~run next_input ~input_typ ~return_typ k ->
-> return_typ:(a, retval, _, _) Types.Typ.t
-> (input_var -> checked)
-> R1CS_constraint_system.t =
fun ~run next_input ~input_typ ~return_typ k ->
(* allocate variables for the public input and the public output *)
let retval, checked =
collect_input_constraints next_input ~input_typ ~return_typ (fun () ->
Expand All @@ -254,19 +290,19 @@ struct
(Checked.map ~f:(fun r -> r ()) checked)

let constraint_system (type a checked input_var) :
run:(a, checked) Runner.run
-> input_typ:(input_var, _, _, _) Types.Typ.typ
-> return_typ:_
-> (input_var -> checked)
-> R1CS_constraint_system.t =
fun ~run ~input_typ ~return_typ k ->
run:(a, checked) Runner.run
-> input_typ:(input_var, _, _, _) Types.Typ.typ
-> return_typ:_
-> (input_var -> checked)
-> R1CS_constraint_system.t =
fun ~run ~input_typ ~return_typ k ->
r1cs_h ~run (ref 0) ~input_typ ~return_typ k

let generate_public_input :
('input_var, 'input_value, _, _) Types.Typ.typ
-> 'input_value
-> Field.Vector.t =
fun (Typ { value_to_fields; _ }) value ->
('input_var, 'input_value, _, _) Types.Typ.typ
-> 'input_value
-> Field.Vector.t =
fun (Typ { value_to_fields; _ }) value ->
let primary_input = Field.Vector.create () in
let next_input = ref 0 in
let store_field_elt = store_field_elt primary_input next_input in
Expand All @@ -275,14 +311,14 @@ struct
primary_input

let conv :
type r_var r_value.
(int -> _ -> r_var -> Field.Vector.t -> r_value)
-> ('input_var, 'input_value, _, _) Types.Typ.t
-> _ Types.Typ.t
-> (unit -> 'input_var -> r_var)
-> 'input_value
-> r_value =
fun cont0 input_typ (Typ return_typ) k0 ->
type r_var r_value.
(int -> _ -> r_var -> Field.Vector.t -> r_value)
-> ('input_var, 'input_value, _, _) Types.Typ.t
-> _ Types.Typ.t
-> (unit -> 'input_var -> r_var)
-> 'input_value
-> r_value =
fun cont0 input_typ (Typ return_typ) k0 ->
let primary_input = Field.Vector.create () in
let next_input = ref 0 in
let store_field_elt x =
Expand All @@ -305,59 +341,79 @@ struct
cont0 !next_input retval (k0 () var) primary_input

let generate_auxiliary_input :
run:('a, 'checked) Runner.run
-> input_typ:_ Types.Typ.t
-> return_typ:(_, _, _, _) Types.Typ.t
-> ?handlers:Handler.t list
-> 'k_var
-> 'k_value =
fun ~run ~input_typ ~return_typ ?handlers k ->
run:('a, 'checked) Runner.run
-> input_typ:_ Types.Typ.t
-> return_typ:(_, _, _, _) Types.Typ.t
-> ?handlers:Handler.t list
-> 'k_var
-> 'k_value =
fun ~run ~input_typ ~return_typ ?handlers k ->
conv
(fun num_inputs output c primary ->
let auxiliary =
auxiliary_input ~run ?handlers ~return_typ ~output ~num_inputs c
primary
in
ignore auxiliary )
let auxiliary =
auxiliary_input ~run ?handlers ~return_typ ~output ~num_inputs c
primary
in
ignore auxiliary )
input_typ return_typ
(fun () -> k)

let generate_witness_conv :
run:('a, 'checked) Runner.run
-> f:(Proof_inputs.t -> _ -> 'out)
-> input_typ:_ Types.Typ.t
-> return_typ:_ Types.Typ.t
-> ?handlers:Handler.t list
-> 'k_var
-> 'k_value =
fun ~run ~f ~input_typ ~return_typ ?handlers k ->
run:('a, 'checked) Runner.run
-> f:(Proof_inputs.t -> _ -> 'out)
-> input_typ:_ Types.Typ.t
-> return_typ:_ Types.Typ.t
-> ?handlers:Handler.t list
-> 'k_var
-> 'k_value =
fun ~run ~f ~input_typ ~return_typ ?handlers k ->
conv
(fun num_inputs output c primary ->
let auxiliary, output =
auxiliary_input ~run ?handlers ~return_typ ~output ~num_inputs c
primary
in
let output =
let (Typ return_typ) = return_typ in
let fields, aux = return_typ.var_to_fields output in
let read_cvar =
let get_one i =
if i < num_inputs then Field.Vector.get primary i
else Field.Vector.get auxiliary (i - num_inputs)
in
Cvar.eval (`Return_values_will_be_mutated get_one)
in
let fields = Array.map ~f:read_cvar fields in
return_typ.value_of_fields (fields, aux)
in
f
{ Proof_inputs.public_inputs = primary
; auxiliary_inputs = auxiliary
}
output )
let auxiliary, output =
auxiliary_input ~run ?handlers ~return_typ ~output ~num_inputs c
primary
in
let output =
let (Typ return_typ) = return_typ in
let fields, aux = return_typ.var_to_fields output in
let read_cvar =
let get_one i =
if i < num_inputs then Field.Vector.get primary i
else Field.Vector.get auxiliary (i - num_inputs)
in
Cvar.eval (`Return_values_will_be_mutated get_one)
in
let fields = Array.map ~f:read_cvar fields in
return_typ.value_of_fields (fields, aux)
in
f
{ Proof_inputs.public_inputs = primary
; auxiliary_inputs = auxiliary
}
output )
input_typ return_typ
(fun () -> k)

let generate_external_values :
run:('a, 'checked) Runner.run
-> input_typ:_ Types.Typ.t
-> return_typ:_ Types.Typ.t
-> 'k_var
-> 'k_value =
fun ~run ~input_typ ~return_typ k ->
conv
(fun num_inputs output c primary ->
let auxiliary =
auxiliary_input_simplified ~run ~return_typ ~output ~num_inputs c
primary in

{ Proof_inputs.public_inputs = primary
; auxiliary_inputs = auxiliary
})
input_typ
return_typ
(fun () -> k)

let generate_witness =
generate_witness_conv ~f:(fun inputs _output -> inputs)
end
Expand All @@ -369,6 +425,9 @@ struct
let generate_witness_conv ~run ~f t ~return_typ k =
Run.generate_witness_conv ~run ~f t ~return_typ k

let generate_external_values ~run t ~return_typ k =
Run.generate_external_values ~run t ~return_typ k

let constraint_system = Run.constraint_system

let run_unchecked = run_unchecked
Expand Down
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