avoid changing the state's context -- this results in transfer problems later with SMT, and hence preplay tactic failures
(* Title: HOL/Tools/Sledgehammer/sledgehammer_prover_atp.ML
Author: Fabian Immler, TU Muenchen
Author: Makarius
Author: Jasmin Blanchette, TU Muenchen
ATPs as Sledgehammer provers.
*)
signature SLEDGEHAMMER_PROVER_ATP =
sig
type mode = Sledgehammer_Prover.mode
type prover = Sledgehammer_Prover.prover
val atp_dest_dir : string Config.T
val atp_problem_prefix : string Config.T
val atp_completish : bool Config.T
val atp_full_names : bool Config.T
val is_ho_atp : Proof.context -> string -> bool
val run_atp : mode -> string -> prover
end;
structure Sledgehammer_Prover_ATP : SLEDGEHAMMER_PROVER_ATP =
struct
open ATP_Util
open ATP_Problem
open ATP_Proof
open ATP_Problem_Generate
open ATP_Proof_Reconstruct
open ATP_Systems
open Sledgehammer_Util
open Sledgehammer_Proof_Methods
open Sledgehammer_Isar
open Sledgehammer_Prover
(* Empty string means create files in Isabelle's temporary files directory. *)
val atp_dest_dir = Attrib.setup_config_string @{binding sledgehammer_atp_dest_dir} (K "")
val atp_problem_prefix =
Attrib.setup_config_string @{binding sledgehammer_atp_problem_prefix} (K "prob")
val atp_completish = Attrib.setup_config_bool @{binding sledgehammer_atp_completish} (K false)
(* In addition to being easier to read, readable names are often much shorter, especially if types
are mangled in names. This makes a difference for some provers (e.g., E). For these reason, short
names are enabled by default. *)
val atp_full_names = Attrib.setup_config_bool @{binding sledgehammer_atp_full_names} (K false)
fun is_atp_of_format is_format ctxt name =
let val thy = Proof_Context.theory_of ctxt in
(case try (get_atp thy) name of
SOME config =>
exists (fn (_, ((_, format, _, _, _), _)) => is_format format) (#best_slices (config ()) ctxt)
| NONE => false)
end
val is_ho_atp = is_atp_of_format is_format_higher_order
fun choose_type_enc strictness best_type_enc format =
the_default best_type_enc
#> type_enc_of_string strictness
#> adjust_type_enc format
fun has_bound_or_var_of_type pred =
exists_subterm (fn Var (_, T as Type _) => pred T
| Abs (_, T as Type _, _) => pred T
| _ => false)
(* Unwanted equalities are those between a (bound or schematic) variable that does not properly
occur in the second operand. *)
val is_exhaustive_finite =
let
fun is_bad_equal (Var z) t =
not (exists_subterm (fn Var z' => z = z' | _ => false) t)
| is_bad_equal (Bound j) t = not (loose_bvar1 (t, j))
| is_bad_equal _ _ = false
fun do_equals t1 t2 = is_bad_equal t1 t2 orelse is_bad_equal t2 t1
fun do_formula pos t =
(case (pos, t) of
(_, @{const Trueprop} $ t1) => do_formula pos t1
| (true, Const (@{const_name all}, _) $ Abs (_, _, t')) => do_formula pos t'
| (true, Const (@{const_name All}, _) $ Abs (_, _, t')) => do_formula pos t'
| (false, Const (@{const_name Ex}, _) $ Abs (_, _, t')) => do_formula pos t'
| (_, @{const "==>"} $ t1 $ t2) =>
do_formula (not pos) t1 andalso (t2 = @{prop False} orelse do_formula pos t2)
| (_, @{const HOL.implies} $ t1 $ t2) =>
do_formula (not pos) t1 andalso (t2 = @{const False} orelse do_formula pos t2)
| (_, @{const Not} $ t1) => do_formula (not pos) t1
| (true, @{const HOL.disj} $ t1 $ t2) => forall (do_formula pos) [t1, t2]
| (false, @{const HOL.conj} $ t1 $ t2) => forall (do_formula pos) [t1, t2]
| (true, Const (@{const_name HOL.eq}, _) $ t1 $ t2) => do_equals t1 t2
| (true, Const (@{const_name "=="}, _) $ t1 $ t2) => do_equals t1 t2
| _ => false)
in do_formula true end
(* Facts containing variables of finite types such as "unit" or "bool" or of the form
"ALL x. x = A | x = B | x = C" are likely to lead to untypable proofs for unsound type
encodings. *)
fun is_dangerous_prop ctxt =
transform_elim_prop
#> (has_bound_or_var_of_type (is_type_surely_finite ctxt) orf is_exhaustive_finite)
fun get_slices slice slices =
(0 upto length slices - 1) ~~ slices |> not slice ? (List.last #> single)
fun get_facts_of_filter _ [(_, facts)] = facts
| get_facts_of_filter fact_filter factss =
(case AList.lookup (op =) factss fact_filter of
SOME facts => facts
| NONE => snd (hd factss))
(* For low values of "max_facts", this fudge value ensures that most slices are invoked with a
nontrivial amount of facts. *)
val max_fact_factor_fudge = 5
val mono_max_privileged_facts = 10
fun suffix_of_mode Auto_Try = "_try"
| suffix_of_mode Try = "_try"
| suffix_of_mode Normal = ""
| suffix_of_mode MaSh = ""
| suffix_of_mode Auto_Minimize = "_min"
| suffix_of_mode Minimize = "_min"
(* Give the ATPs some slack before interrupting them the hard way. "z3_tptp" on Linux appears to be
the only ATP that does not honor its time limit. *)
val atp_timeout_slack = seconds 1.0
(* Important messages are important but not so important that users want to see
them each time. *)
val atp_important_message_keep_quotient = 25
fun run_atp mode name
(params as {debug, verbose, overlord, type_enc, strict, lam_trans, uncurried_aliases,
fact_filter, max_facts, max_mono_iters, max_new_mono_instances, isar_proofs, compress_isar,
try0_isar, smt_proofs, slice, minimize, timeout, preplay_timeout, ...})
minimize_command
({comment, state, goal, subgoal, subgoal_count, factss, ...} : prover_problem) =
let
val thy = Proof.theory_of state
val ctxt = Proof.context_of state
val {exec, arguments, proof_delims, known_failures, prem_role, best_slices, best_max_mono_iters,
best_max_new_mono_instances, ...} = get_atp thy name ()
val atp_mode = if Config.get ctxt atp_completish then Sledgehammer_Completish else Sledgehammer
val (_, hyp_ts, concl_t) = strip_subgoal goal subgoal ctxt
val (dest_dir, problem_prefix) =
if overlord then overlord_file_location_of_prover name
else (Config.get ctxt atp_dest_dir, Config.get ctxt atp_problem_prefix)
val problem_file_name =
Path.basic (problem_prefix ^ (if overlord then "" else serial_string ()) ^
suffix_of_mode mode ^ "_" ^ string_of_int subgoal)
val prob_path =
if dest_dir = "" then
File.tmp_path problem_file_name
else if File.exists (Path.explode dest_dir) then
Path.append (Path.explode dest_dir) problem_file_name
else
error ("No such directory: " ^ quote dest_dir ^ ".")
val exec = exec ()
val command0 =
(case find_first (fn var => getenv var <> "") (fst exec) of
SOME var =>
let
val pref = getenv var ^ "/"
val paths = map (Path.explode o prefix pref) (snd exec)
in
(case find_first File.exists paths of
SOME path => path
| NONE => error ("Bad executable: " ^ Path.print (hd paths) ^ "."))
end
| NONE => error ("The environment variable " ^ quote (List.last (fst exec)) ^ " is not set."))
fun split_time s =
let
val split = String.tokens (fn c => str c = "\n")
val (output, t) = s |> split |> (try split_last #> the_default ([], "0")) |>> cat_lines
val num = Scan.many1 Symbol.is_ascii_digit >> (fst o read_int)
val digit = Scan.one Symbol.is_ascii_digit
val num3 = digit ::: digit ::: (digit >> single) >> (fst o read_int)
val time = num --| Scan.$$ "." -- num3 >> (fn (a, b) => a * 1000 + b)
val as_time = raw_explode #> Scan.read Symbol.stopper time #> the_default 0
in (output, as_time t |> Time.fromMilliseconds) end
fun run () =
let
(* If slicing is disabled, we expand the last slice to fill the entire time available. *)
val all_slices = best_slices ctxt
val actual_slices = get_slices slice all_slices
fun max_facts_of_slices (slices : (real * (slice_spec * string)) list) =
fold (Integer.max o fst o #1 o fst o snd) slices 0
val num_actual_slices = length actual_slices
val max_fact_factor =
Real.fromInt (case max_facts of NONE => max_facts_of_slices all_slices | SOME max => max)
/ Real.fromInt (max_facts_of_slices (map snd actual_slices))
fun monomorphize_facts facts =
let
val ctxt =
ctxt
|> repair_monomorph_context max_mono_iters best_max_mono_iters max_new_mono_instances
best_max_new_mono_instances
(* pseudo-theorem involving the same constants as the subgoal *)
val subgoal_th =
Logic.list_implies (hyp_ts, concl_t) |> Skip_Proof.make_thm thy
val rths =
facts |> chop mono_max_privileged_facts
|>> map (pair 1 o snd)
||> map (pair 2 o snd)
|> op @
|> cons (0, subgoal_th)
in
Monomorph.monomorph atp_schematic_consts_of ctxt rths
|> tl |> curry ListPair.zip (map fst facts)
|> maps (fn (name, rths) => map (pair name o zero_var_indexes o snd) rths)
end
fun run_slice time_left (cache_key, cache_value) (slice, (time_frac,
(key as ((best_max_facts, best_fact_filter), format, best_type_enc, best_lam_trans,
best_uncurried_aliases),
extra))) =
let
val effective_fact_filter = fact_filter |> the_default best_fact_filter
val facts = get_facts_of_filter effective_fact_filter factss
val num_facts =
Real.ceil (max_fact_factor * Real.fromInt best_max_facts) + max_fact_factor_fudge
|> Integer.min (length facts)
val strictness = if strict then Strict else Non_Strict
val type_enc = type_enc |> choose_type_enc strictness best_type_enc format
val sound = is_type_enc_sound type_enc
val real_ms = Real.fromInt o Time.toMilliseconds
val slice_timeout =
(real_ms time_left
|> (if slice < num_actual_slices - 1 then
curry Real.min (time_frac * real_ms timeout)
else
I))
* 0.001
|> seconds
val generous_slice_timeout =
if mode = MaSh then one_day else Time.+ (slice_timeout, atp_timeout_slack)
val _ =
if debug then
quote name ^ " slice #" ^ string_of_int (slice + 1) ^
" with " ^ string_of_int num_facts ^ " fact" ^
plural_s num_facts ^ " for " ^ string_of_time slice_timeout ^ "..."
|> Output.urgent_message
else
()
val readable_names = not (Config.get ctxt atp_full_names)
val lam_trans = lam_trans |> the_default best_lam_trans
val uncurried_aliases = uncurried_aliases |> the_default best_uncurried_aliases
val value as (atp_problem, _, fact_names, _, _) =
if cache_key = SOME key then
cache_value
else
facts
|> not sound ? filter_out (is_dangerous_prop ctxt o prop_of o snd)
|> take num_facts
|> not (is_type_enc_polymorphic type_enc) ? monomorphize_facts
|> map (apsnd prop_of)
|> prepare_atp_problem ctxt format prem_role type_enc atp_mode lam_trans
uncurried_aliases readable_names true hyp_ts concl_t
fun sel_weights () = atp_problem_selection_weights atp_problem
fun ord_info () = atp_problem_term_order_info atp_problem
val ord = effective_term_order ctxt name
val full_proof = isar_proofs |> the_default (mode = Minimize)
val args =
arguments ctxt full_proof extra slice_timeout (File.shell_path prob_path)
(ord, ord_info, sel_weights)
val command =
"(exec 2>&1; " ^ File.shell_path command0 ^ " " ^ args ^ " " ^ ")"
|> enclose "TIMEFORMAT='%3R'; { time " " ; }"
val _ =
atp_problem
|> lines_of_atp_problem format ord ord_info
|> cons ("% " ^ command ^ "\n" ^ (if comment = "" then "" else "% " ^ comment ^ "\n"))
|> File.write_list prob_path
val ((output, run_time), (atp_proof, outcome)) =
TimeLimit.timeLimit generous_slice_timeout Isabelle_System.bash_output command
|>> (if overlord then prefix ("% " ^ command ^ "\n% " ^ timestamp () ^ "\n") else I)
|> fst |> split_time
|> (fn accum as (output, _) =>
(accum,
extract_tstplike_proof_and_outcome verbose proof_delims known_failures output
|>> atp_proof_of_tstplike_proof atp_problem
handle UNRECOGNIZED_ATP_PROOF () => ([], SOME ProofIncomplete)))
handle TimeLimit.TimeOut => (("", slice_timeout), ([], SOME TimedOut))
val outcome =
(case outcome of
NONE =>
(case used_facts_in_unsound_atp_proof ctxt fact_names atp_proof
|> Option.map (sort string_ord) of
SOME facts =>
let val failure = UnsoundProof (is_type_enc_sound type_enc, facts) in
if debug then (warning (string_of_atp_failure failure); NONE) else SOME failure
end
| NONE => NONE)
| _ => outcome)
in
((SOME key, value), (output, run_time, facts, atp_proof, outcome))
end
val timer = Timer.startRealTimer ()
fun maybe_run_slice slice (result as (cache, (_, run_time0, _, _, SOME _))) =
let val time_left = Time.- (timeout, Timer.checkRealTimer timer) in
if Time.<= (time_left, Time.zeroTime) then
result
else
run_slice time_left cache slice
|> (fn (cache, (output, run_time, used_from, atp_proof, outcome)) =>
(cache, (output, Time.+ (run_time0, run_time), used_from, atp_proof, outcome)))
end
| maybe_run_slice _ result = result
in
((NONE, ([], Symtab.empty, Vector.fromList [], [], Symtab.empty)),
("", Time.zeroTime, [], [], SOME InternalError))
|> fold maybe_run_slice actual_slices
end
(* If the problem file has not been exported, remove it; otherwise, export
the proof file too. *)
fun clean_up () = if dest_dir = "" then (try File.rm prob_path; ()) else ()
fun export (_, (output, _, _, _, _)) =
if dest_dir = "" then ()
else File.write (Path.explode (Path.implode prob_path ^ "_proof")) output
val ((_, (_, pool, fact_names, lifted, sym_tab)),
(output, run_time, used_from, atp_proof, outcome)) =
with_cleanup clean_up run () |> tap export
val important_message =
if mode = Normal andalso random_range 0 (atp_important_message_keep_quotient - 1) = 0 then
extract_important_message output
else
""
val (used_facts, preplay, message, message_tail) =
(case outcome of
NONE =>
let
val used_facts = used_facts_in_atp_proof ctxt fact_names atp_proof
val needs_full_types = is_typed_helper_used_in_atp_proof atp_proof
val meths =
bunch_of_proof_methods (smt_proofs <> SOME false) needs_full_types
(if atp_proof_prefers_lifting atp_proof then liftingN else hide_lamsN)
in
(used_facts,
Lazy.lazy (fn () =>
let val used_pairs = used_from |> filter_used_facts false used_facts in
play_one_line_proof mode debug verbose preplay_timeout used_pairs state subgoal
(hd meths) meths
end),
fn preplay =>
let
val _ = if verbose then Output.urgent_message "Generating proof text..." else ()
fun isar_params () =
let
val metis_type_enc =
if is_typed_helper_used_in_atp_proof atp_proof then SOME full_typesN else NONE
val metis_lam_trans =
if atp_proof_prefers_lifting atp_proof then SOME liftingN else NONE
val atp_proof =
atp_proof
|> termify_atp_proof ctxt pool lifted sym_tab
|> introduce_spass_skolem
|> factify_atp_proof fact_names hyp_ts concl_t
in
(verbose, (metis_type_enc, metis_lam_trans), preplay_timeout, compress_isar,
try0_isar, minimize <> SOME false, atp_proof, goal)
end
val one_line_params =
(preplay, proof_banner mode name, used_facts,
choose_minimize_command thy params minimize_command name preplay, subgoal,
subgoal_count)
val num_chained = length (#facts (Proof.goal state))
in
proof_text ctxt debug isar_proofs smt_proofs isar_params num_chained one_line_params
end,
(if verbose then "\nATP real CPU time: " ^ string_of_time run_time ^ "." else "") ^
(if important_message <> "" then
"\n\nImportant message from Dr. Geoff Sutcliffe:\n" ^ important_message
else
""))
end
| SOME failure =>
([], Lazy.value (Metis_Method (NONE, NONE), Play_Failed),
fn _ => string_of_atp_failure failure, ""))
in
{outcome = outcome, used_facts = used_facts, used_from = used_from, run_time = run_time,
preplay = preplay, message = message, message_tail = message_tail}
end
end;