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some additional comments and cleanup

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This commit is contained in:
Simon Cruanes 2016-07-22 16:40:22 +02:00
parent 891f764ee8
commit 895cb9cbfb
1 changed files with 14 additions and 10 deletions
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24
src/core/internal.ml
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@ -1159,18 +1159,19 @@ module Make
let unsat_conflict () = env.unsat_conflict
let model () =
let model () : (term * term) list =
let opt = function Some a -> a | None -> assert false in
Vec.fold (fun acc e -> match e with
Vec.fold
(fun acc e -> match e with
| Lit v -> (v.term, opt v.assigned) :: acc
| Atom _ -> acc
) [] env.elt_queue
| Atom _ -> acc)
[] env.elt_queue
(* Backtrack to decision_level 0, with trail_lim && theory env specified *)
let reset_until push_lvl elt_lvl th_lvl th_env =
let reset_until push_lvl (ul: user_level) =
Log.debug 1 "Resetting to decision level 0 (pop/forced)";
env.th_head <- th_lvl;
env.elt_head <- elt_lvl;
env.th_head <- ul.ul_th_lvl ;
env.elt_head <- ul.ul_elt_lvl;
for c = env.elt_head to Vec.size env.elt_queue - 1 do
match Vec.get env.elt_queue c with
| Lit l ->
@ -1187,6 +1188,8 @@ module Make
insert_var_order (elt_of_var a.var)
| _ ->
if a.var.v_level = 0 then begin
(* [a] is still true, so we move it to the current top position
of the trail, as if it was propagated again *)
Vec.set env.elt_queue env.elt_head (of_atom a);
env.elt_head <- env.elt_head + 1
end else begin
@ -1198,7 +1201,7 @@ module Make
end
end
done;
Plugin.backtrack th_env; (* recover the right theory env *)
Plugin.backtrack ul.ul_th_env; (* recover the right theory env *)
Vec.shrink env.elt_queue ((Vec.size env.elt_queue) - env.elt_head);
Vec.clear env.elt_levels;
Vec.clear env.th_levels;
@ -1206,7 +1209,7 @@ module Make
assert (env.elt_head = Vec.size env.elt_queue);
()
let pop l =
let pop l: unit =
(* Check sanity of pop *)
if l > current_level () then invalid_arg "cannot pop to level, it is too high"
else if l < current_level () then begin
@ -1218,7 +1221,7 @@ module Make
env.unsat_conflict <- None;
(* Backtrack to the level 0 with appropriate settings *)
reset_until l ul.ul_elt_lvl ul.ul_th_lvl ul.ul_th_env;
reset_until l ul;
(* Log current assumptions for debugging purposes *)
Log.debugf 99 "@[<v2>Current trail:@ %a@]"
@ -1240,6 +1243,7 @@ module Make
(* Clear hypothesis not valid anymore *)
for i = ul.ul_clauses to Vec.size env.clauses_hyps - 1 do
let c = Vec.get env.clauses_hyps i in
assert c.attached;
assert (c.c_level > l);
detach_clause c
done;