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fix(propagate): insert propagated literal itself

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Simon Cruanes 2019-02-09 17:10:39 -06:00 • committed by Guillaume Bury
parent 1ccc292d79
commit 7583e78bd2
1 changed files with 25 additions and 22 deletions
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47
src/core/Internal.ml
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@ -874,7 +874,7 @@ module Make(Plugin : PLUGIN)
When we add a variable (which wraps a formula), we also need to add all
its subterms.
*)
let rec insert_var_order st (elt:elt) : unit =
let rec insert_elt_order st (elt:elt) : unit =
H.insert st.order elt;
if Plugin.mcsat then (
match elt with
@ -882,8 +882,11 @@ module Make(Plugin : PLUGIN)
| E_var v -> insert_subterms_order st v
)
and insert_var_order st (v:var) : unit =
insert_elt_order st (E_var v)
and insert_subterms_order st (v:var) : unit =
iter_sub (fun t -> insert_var_order st (Elt.of_lit t)) v
iter_sub (fun t -> insert_elt_order st (Elt.of_lit t)) v
(* Add new litterals/atoms on which to decide on, even if there is no
clause that constrains it.
@ -892,13 +895,13 @@ module Make(Plugin : PLUGIN)
let make_term st t =
let l = Lit.make st.st t in
if l.l_level < 0 then (
insert_var_order st (E_lit l)
insert_elt_order st (E_lit l)
)
let make_atom st (p:formula) : atom =
let a = mk_atom st p in
if a.var.v_level < 0 then (
insert_var_order st (E_var a.var);
insert_elt_order st (E_var a.var);
) else (
assert (a.is_true || a.neg.is_true);
);
@ -1100,7 +1103,7 @@ module Make(Plugin : PLUGIN)
) else (
l.assigned <- None;
l.l_level <- -1;
insert_var_order st (Elt.of_lit l)
insert_elt_order st (Elt.of_lit l)
)
(* A variable is not true/false anymore, one of two things can happen: *)
| Atom a ->
@ -1118,7 +1121,7 @@ module Make(Plugin : PLUGIN)
a.neg.is_true <- false;
a.var.v_level <- -1;
a.var.reason <- None;
insert_var_order st (Elt.of_var a.var)
insert_elt_order st (Elt.of_var a.var)
)
done;
(* Recover the right theory state. *)
@ -1469,7 +1472,7 @@ module Make(Plugin : PLUGIN)
Log.debugf debug (fun k -> k "(@[sat.add-clause@ @[<hov>%a@]@])" Clause.debug init);
(* Insertion of new lits is done before simplification. Indeed, else a lit in a
trivial clause could end up being not decided on, which is a bug. *)
Array.iter (fun x -> insert_var_order st (Elt.of_var x.var)) init.atoms;
Array.iter (fun x -> insert_elt_order st (Elt.of_var x.var)) init.atoms;
try
let c = eliminate_duplicates init in
assert (c.flags = init.flags);
@ -1648,20 +1651,20 @@ module Make(Plugin : PLUGIN)
let a = mk_atom st f in
enqueue_semantic st a l
| Solver_intf.Consequence (causes, proof) ->
let l = List.rev_map (mk_atom st) causes in
if List.for_all (fun a -> a.is_true) l then (
let p = mk_atom st f in
let c = Clause.make_removable (p :: List.map Atom.neg l) (Lemma proof) in
if p.is_true then ()
else if p.neg.is_true then (
Vec.push st.clauses_to_add c
) else (
insert_subterms_order st p.var;
let level = List.fold_left (fun acc a -> max acc a.var.v_level) 0 l in
enqueue_bool st p ~level (Bcp c)
)
) else (
let l = List.rev_map (fun f -> Atom.neg @@ mk_atom st f) causes in
if List.exists Atom.is_true l then (
invalid_argf "slice.acts_propagate: Consequence should contain only true literals"
);
let p = mk_atom st f in
if Atom.is_true p then ()
else if Atom.is_false p then (
let c = Clause.make_removable (p :: l) (Lemma proof) in
raise_notrace (Th_conflict c)
) else (
insert_var_order st p.var;
let level = List.fold_left (fun acc a -> max acc a.var.v_level) 0 l in
let c = Clause.make_removable (p :: l) (Lemma proof) in
enqueue_bool st p ~level (Bcp c)
)
let[@specialise] acts_iter st ~full head f : unit =
@ -1736,7 +1739,7 @@ module Make(Plugin : PLUGIN)
propagate st
| exception Th_conflict c ->
check_is_conflict_ c;
Array.iter (fun a -> insert_var_order st (Elt.of_var a.var)) c.atoms;
Array.iter (fun a -> insert_elt_order st (Elt.of_var a.var)) c.atoms;
Some c
)
@ -1964,7 +1967,7 @@ module Make(Plugin : PLUGIN)
flush_clauses st;
| exception Th_conflict c ->
check_is_conflict_ c;
Array.iter (fun a -> insert_var_order st (Elt.of_var a.var)) c.atoms;
Array.iter (fun a -> insert_elt_order st (Elt.of_var a.var)) c.atoms;
Log.debugf info (fun k -> k "(@[sat.theory-conflict-clause@ %a@])" Clause.debug c);
Vec.push st.clauses_to_add c;
flush_clauses st;