mirror of
https://github.com/c-cube/sidekick.git
synced 2025-12-06 03:05:31 -05:00
145 lines
3.6 KiB
OCaml
145 lines
3.6 KiB
OCaml
(*
|
|
MSAT is free software, using the Apache license, see file LICENSE
|
|
Copyright 2014 Guillaume Bury
|
|
Copyright 2014 Simon Cruanes
|
|
*)
|
|
|
|
module Fsmt = Expr
|
|
|
|
module Tsmt = struct
|
|
|
|
module M = Map.Make(Fsmt.Term)
|
|
module CC = Cc.Make(String)
|
|
|
|
(* Type definitions *)
|
|
type term = Fsmt.var
|
|
type formula = Fsmt.t
|
|
|
|
type proof = unit
|
|
|
|
type assumption =
|
|
| Lit of formula
|
|
| Assign of term * term
|
|
|
|
type slice = {
|
|
start : int;
|
|
length : int;
|
|
get : int -> assumption * int;
|
|
push : formula list -> proof -> unit;
|
|
}
|
|
|
|
type level = {
|
|
cc : CC.t;
|
|
assign : (term * int) M.t;
|
|
}
|
|
|
|
type res =
|
|
| Sat of level
|
|
| Unsat of formula list * proof
|
|
|
|
type eval_res =
|
|
| Valued of bool * int
|
|
| Unknown
|
|
|
|
(* Functions *)
|
|
let dummy = { cc = CC.empty; assign = M.empty; }
|
|
|
|
let env = ref dummy
|
|
|
|
let current_level () = !env
|
|
|
|
let to_clause (a, b, l) =
|
|
Log.debug 10 "Expl : %s; %s" a b;
|
|
List.iter (fun s -> Log.debug 10 " |- %s" s) l;
|
|
let rec aux acc = function
|
|
| [] | [_] -> acc
|
|
| x :: ((y :: _) as r) ->
|
|
aux (Fsmt.mk_eq x y :: acc) r
|
|
in
|
|
(Fsmt.mk_eq a b) :: (List.rev_map Fsmt.neg (aux [] l))
|
|
|
|
let assume s =
|
|
try
|
|
for i = s.start to s.start + s.length - 1 do
|
|
match s.get i with
|
|
| (Assign (x, v)), lvl ->
|
|
env := { !env with assign = M.add x (v, lvl) !env.assign }
|
|
| Lit f, _ ->
|
|
Log.debug 10 "Propagating in th : %s" (Log.on_fmt Fsmt.print f);
|
|
match f with
|
|
| Fsmt.Prop _ -> ()
|
|
| Fsmt.Equal (i, j) ->
|
|
env := { !env with cc = CC.add_eq !env.cc i j }
|
|
| Fsmt.Distinct (i, j) ->
|
|
env := { !env with cc = CC.add_neq !env.cc i j }
|
|
| _ -> assert false
|
|
done;
|
|
Sat (current_level ())
|
|
with CC.Unsat x ->
|
|
Log.debug 8 "Making explanation clause...";
|
|
Unsat (to_clause x, ())
|
|
|
|
let backtrack l = env := l
|
|
|
|
let assign t = CC.repr !env.cc t
|
|
|
|
let iter_assignable f = function
|
|
| Fsmt.Prop _ -> ()
|
|
| Fsmt.Equal(a, b)
|
|
| Fsmt.Distinct (a, b) -> f a; f b
|
|
|
|
let eval = function
|
|
| Fsmt.Prop _ -> Unknown
|
|
| Fsmt.Equal (a, b) ->
|
|
begin try
|
|
let a', lvl_a = M.find a !env.assign in
|
|
let b', lvl_b = M.find b !env.assign in
|
|
Valued (Fsmt.Term.equal a' b', max lvl_a lvl_b)
|
|
with Not_found -> Unknown end
|
|
| Fsmt.Distinct (a, b) ->
|
|
begin try
|
|
let a', lvl_a = M.find a !env.assign in
|
|
let b', lvl_b = M.find b !env.assign in
|
|
Valued (not (Fsmt.Term.equal a' b'), max lvl_a lvl_b)
|
|
with Not_found -> Unknown end
|
|
|
|
end
|
|
|
|
module Make(Dummy:sig end) = struct
|
|
module SmtSolver = Mcsolver.Make(Fsmt)(Tsmt)
|
|
|
|
type atom = Fsmt.t
|
|
type clause = SmtSolver.St.clause
|
|
type proof = SmtSolver.Proof.proof
|
|
|
|
type res =
|
|
| Sat
|
|
| Unsat
|
|
|
|
let _i = ref 0
|
|
let solve () =
|
|
try
|
|
SmtSolver.solve ();
|
|
Sat
|
|
with SmtSolver.Unsat -> Unsat
|
|
|
|
let assume l =
|
|
incr _i;
|
|
try
|
|
SmtSolver.assume l !_i
|
|
with SmtSolver.Unsat -> ()
|
|
|
|
let get_proof () =
|
|
SmtSolver.Proof.learn (SmtSolver.history ());
|
|
match SmtSolver.unsat_conflict () with
|
|
| None -> assert false
|
|
| Some c -> SmtSolver.Proof.prove_unsat c
|
|
|
|
let eval = SmtSolver.eval
|
|
|
|
let unsat_core = SmtSolver.Proof.unsat_core
|
|
|
|
let print_atom = Fsmt.print
|
|
let print_clause = SmtSolver.St.print_clause
|
|
let print_proof = SmtSolver.Proof.print_dot
|
|
end
|