src/HOL/Tools/ATP_Manager/atp_wrapper.ML
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(*  Title:      HOL/Tools/ATP_Manager/atp_wrapper.ML
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    Author:     Fabian Immler, TU Muenchen
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Wrapper functions for external ATPs.
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*)
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signature ATP_WRAPPER =
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sig
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  type prover = ATP_Manager.prover
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  (* hooks for problem files *)
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  val destdir : string Config.T
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  val problem_prefix : string Config.T
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  val measure_runtime : bool Config.T
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  val refresh_systems_on_tptp : unit -> unit
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  val setup : theory -> theory
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end;
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structure ATP_Wrapper : ATP_WRAPPER =
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struct
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open Sledgehammer_Util
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open Sledgehammer_Fact_Preprocessor
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open Sledgehammer_HOL_Clause
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open Sledgehammer_Fact_Filter
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open Sledgehammer_Proof_Reconstruct
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open ATP_Manager
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(** generic ATP wrapper **)
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(* external problem files *)
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val (destdir, destdir_setup) = Attrib.config_string "atp_destdir" (K "");
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  (*Empty string means create files in Isabelle's temporary files directory.*)
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val (problem_prefix, problem_prefix_setup) =
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  Attrib.config_string "atp_problem_prefix" (K "prob");
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val (measure_runtime, measure_runtime_setup) =
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  Attrib.config_bool "atp_measure_runtime" (K false);
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(* prover configuration *)
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type prover_config =
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 {command: Path.T,
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  arguments: Time.time -> string,
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  failure_strs: string list,
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  max_new_clauses: int,
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  prefers_theory_const: bool,
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  supports_isar_proofs: bool};
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(* basic template *)
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fun with_path cleanup after f path =
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  Exn.capture f path
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  |> tap (fn _ => cleanup path)
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  |> Exn.release
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  |> tap (after path);
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fun find_failure strs proof =
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  case filter (fn s => String.isSubstring s proof) strs of
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    [] => if is_proof_well_formed proof then NONE
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          else SOME "Ill-formed ATP output"
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  | (failure :: _) => SOME failure
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fun generic_prover overlord get_facts prepare write_file cmd args failure_strs
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        produce_answer name ({debug, full_types, ...} : params)
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        ({subgoal, goal, relevance_override, axiom_clauses, filtered_clauses}
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         : problem) =
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  let
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    (* get clauses and prepare them for writing *)
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    val (ctxt, (chain_ths, th)) = goal;
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    val thy = ProofContext.theory_of ctxt;
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    val chain_ths = map (Thm.put_name_hint chained_hint) chain_ths;
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    val goal_cls = #1 (neg_conjecture_clauses ctxt th subgoal);
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    val the_filtered_clauses =
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      (case filtered_clauses of
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        NONE => get_facts relevance_override goal goal_cls
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      | SOME fcls => fcls);
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    val the_axiom_clauses =
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      (case axiom_clauses of
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        NONE => the_filtered_clauses
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      | SOME axcls => axcls);
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    val (internal_thm_names, clauses) =
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      prepare goal_cls chain_ths the_axiom_clauses the_filtered_clauses thy;
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    (* path to unique problem file *)
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    val destdir' = if overlord then getenv "ISABELLE_HOME_USER"
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                   else Config.get ctxt destdir;
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    val problem_prefix' = Config.get ctxt problem_prefix;
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    fun prob_pathname nr =
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      let
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        val probfile =
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          Path.basic (problem_prefix' ^
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                      (if overlord then "_" ^ name else serial_string ())
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                      ^ "_" ^ string_of_int nr)
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      in
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        if destdir' = "" then File.tmp_path probfile
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        else if File.exists (Path.explode destdir')
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        then Path.append  (Path.explode destdir') probfile
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        else error ("No such directory: " ^ destdir' ^ ".")
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      end;
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    (* write out problem file and call prover *)
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    fun cmd_line probfile =
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      if Config.get ctxt measure_runtime
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      then (* Warning: suppresses error messages of ATPs *)
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        "TIMEFORMAT='%3U'; { time " ^ space_implode " " [File.shell_path cmd,
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        args, File.shell_path probfile] ^ " 2> /dev/null" ^ " ; } 2>&1"
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      else
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        space_implode " " ["exec", File.shell_path cmd, args,
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        File.shell_path probfile];
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    fun split_time s =
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      let
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        val split = String.tokens (fn c => str c = "\n");
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        val (proof, t) = s |> split |> split_last |> apfst cat_lines;
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        fun as_num f = f >> (fst o read_int);
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        val num = as_num (Scan.many1 Symbol.is_ascii_digit);
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        val digit = Scan.one Symbol.is_ascii_digit;
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        val num3 = as_num (digit ::: digit ::: (digit >> single));
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        val time = num --| Scan.$$ "." -- num3 >> (fn (a, b) => a * 1000 + b);
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        val as_time = the_default 0 o Scan.read Symbol.stopper time o explode;
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      in (proof, as_time t) end;
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    fun split_time' s =
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      if Config.get ctxt measure_runtime then split_time s else (s, 0)
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    fun run_on probfile =
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      if File.exists cmd then
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        write_file debug full_types probfile clauses
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        |> pair (apfst split_time' (bash_output (cmd_line probfile)))
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      else error ("Bad executable: " ^ Path.implode cmd ^ ".");
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    (* If the problem file has not been exported, remove it; otherwise, export
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       the proof file too. *)
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    fun cleanup probfile = if destdir' = "" then try File.rm probfile else NONE;
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    fun export probfile (((proof, _), _), _) =
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      if destdir' = "" then
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        ()
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      else
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        File.write (Path.explode (Path.implode probfile ^ "_proof"))
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                   ("#" ^ timestamp () ^ "\n" ^ proof)
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    val (((proof, atp_run_time_in_msecs), rc), conj_pos) =
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      with_path cleanup export run_on (prob_pathname subgoal);
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    (* Check for success and print out some information on failure. *)
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    val failure = find_failure failure_strs proof;
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    val success = rc = 0 andalso is_none failure;
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    val (message, relevant_thm_names) =
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      if is_some failure then ("ATP failed to find a proof.", [])
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      else if rc <> 0 then ("ATP error: " ^ proof ^ ".", [])
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      else
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        (produce_answer name (proof, internal_thm_names, conj_pos, ctxt, th,
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                              subgoal));
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  in
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    {success = success, message = message,
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     relevant_thm_names = relevant_thm_names,
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     atp_run_time_in_msecs = atp_run_time_in_msecs, proof = proof,
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     internal_thm_names = internal_thm_names,
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     filtered_clauses = the_filtered_clauses}
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  end;
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(* generic TPTP-based provers *)
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fun generic_tptp_prover
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        (name, {command, arguments, failure_strs, max_new_clauses,
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                prefers_theory_const, supports_isar_proofs})
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        (params as {overlord, respect_no_atp, relevance_threshold, convergence,
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                    theory_const, higher_order, follow_defs, isar_proof,
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                    modulus, sorts, ...})
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        timeout =
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  generic_prover overlord
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      (get_relevant_facts respect_no_atp relevance_threshold convergence
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                          higher_order follow_defs max_new_clauses
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                          (the_default prefers_theory_const theory_const))
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      (prepare_clauses higher_order false) write_tptp_file command
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      (arguments timeout) failure_strs
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      (if supports_isar_proofs andalso isar_proof then
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         structured_isar_proof modulus sorts
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       else
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         metis_lemma_list false) name params;
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fun tptp_prover name p = (name, generic_tptp_prover (name, p));
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(** common provers **)
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fun generous_to_secs time = (Time.toMilliseconds time + 999) div 1000
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(* Vampire *)
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(* NB: Vampire does not work without explicit time limit. *)
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val vampire_config : prover_config =
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  {command = Path.explode "$VAMPIRE_HOME/vampire",
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   arguments = (fn timeout => "--output_syntax tptp --mode casc -t " ^
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                              string_of_int (generous_to_secs timeout)),
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   failure_strs =
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     ["Satisfiability detected", "Refutation not found", "CANNOT PROVE"],
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   max_new_clauses = 60,
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   prefers_theory_const = false,
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   supports_isar_proofs = true}
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val vampire = tptp_prover "vampire" vampire_config
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(* E prover *)
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val e_config : prover_config =
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  {command = Path.explode "$E_HOME/eproof",
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   arguments = (fn timeout => "--tstp-in --tstp-out -l5 -xAutoDev \
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                              \-tAutoDev --silent --cpu-limit=" ^
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                              string_of_int (generous_to_secs timeout)),
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   failure_strs =
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       ["SZS status: Satisfiable", "SZS status Satisfiable",
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        "SZS status: ResourceOut", "SZS status ResourceOut",
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        "# Cannot determine problem status"],
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   max_new_clauses = 100,
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   prefers_theory_const = false,
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   supports_isar_proofs = true}
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val e = tptp_prover "e" e_config
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(* SPASS *)
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fun generic_dfg_prover
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        (name, ({command, arguments, failure_strs, max_new_clauses,
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                 prefers_theory_const, ...} : prover_config))
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        (params as {overlord, respect_no_atp, relevance_threshold, convergence,
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                    theory_const, higher_order, follow_defs, ...})
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        timeout =
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  generic_prover overlord
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      (get_relevant_facts respect_no_atp relevance_threshold convergence
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                          higher_order follow_defs max_new_clauses
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                          (the_default prefers_theory_const theory_const))
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      (prepare_clauses higher_order true) write_dfg_file command
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      (arguments timeout) failure_strs (metis_lemma_list true) name params;
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fun dfg_prover (name, p) = (name, generic_dfg_prover (name, p));
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val spass_config : prover_config =
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 {command = Path.explode "$SPASS_HOME/SPASS",
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  arguments = (fn timeout => "-Auto -SOS=1 -PGiven=0 -PProblem=0 -Splits=0" ^
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    " -FullRed=0 -DocProof -TimeLimit=" ^
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    string_of_int (generous_to_secs timeout)),
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  failure_strs =
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    ["SPASS beiseite: Completion found.", "SPASS beiseite: Ran out of time.",
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     "SPASS beiseite: Maximal number of loops exceeded."],
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  max_new_clauses = 40,
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  prefers_theory_const = true,
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  supports_isar_proofs = false}
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val spass = dfg_prover ("spass", spass_config)
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(* remote prover invocation via SystemOnTPTP *)
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val systems = Synchronized.var "atp_wrapper_systems" ([]: string list);
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fun get_systems () =
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  let
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    val (answer, rc) = bash_output "\"$ISABELLE_ATP_MANAGER/SystemOnTPTP\" -w"
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  in
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    if rc <> 0 then
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      error ("Failed to get available systems at SystemOnTPTP:\n" ^ answer)
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    else
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      split_lines answer
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  end;
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fun refresh_systems_on_tptp () =
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  Synchronized.change systems (fn _ => get_systems ());
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fun get_system prefix = Synchronized.change_result systems (fn systems =>
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  (if null systems then get_systems () else systems)
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  |> `(find_first (String.isPrefix prefix)));
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fun the_system prefix =
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  (case get_system prefix of
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    NONE => error ("System " ^ quote prefix ^ " not available at SystemOnTPTP")
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  | SOME sys => sys);
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val remote_failure_strs = ["Remote-script could not extract proof"];
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fun remote_prover_config prover_prefix args
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        ({failure_strs, max_new_clauses, prefers_theory_const, ...}
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         : prover_config) : prover_config =
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  {command = Path.explode "$ISABELLE_ATP_MANAGER/SystemOnTPTP",
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   arguments = (fn timeout =>
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     args ^ " -t " ^ string_of_int (generous_to_secs timeout) ^ " -s " ^
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     the_system prover_prefix),
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   failure_strs = remote_failure_strs @ failure_strs,
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   max_new_clauses = max_new_clauses,
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   prefers_theory_const = prefers_theory_const,
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   supports_isar_proofs = false}
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val remote_vampire =
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  tptp_prover "remote_vampire"
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              (remote_prover_config "Vampire---9" "" vampire_config)
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val remote_e =
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  tptp_prover "remote_e" (remote_prover_config "EP---" "" e_config)
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val remote_spass =
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  tptp_prover "remote_spass" (remote_prover_config "SPASS---" "-x" spass_config)
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val provers = [spass, vampire, e, remote_vampire, remote_spass, remote_e]
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val prover_setup = fold add_prover provers
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val setup =
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  destdir_setup
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  #> problem_prefix_setup
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  #> measure_runtime_setup
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  #> prover_setup;
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end;