src/HOL/Tools/atp_manager.ML
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(*  Title:      HOL/Tools/atp_manager.ML
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    Author:     Fabian Immler, TU Muenchen
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ATP threads are registered here.
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Threads with the same birth-time are seen as one group.
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All threads of a group are killed when one thread of it has been successful,
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or after a certain time,
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or when the maximum number of threads exceeds; then the oldest thread is killed.
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*)
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signature ATP_MANAGER =
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sig
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  val get_atps: unit -> string
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  val set_atps: string -> unit
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  val get_max_atps: unit -> int
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  val set_max_atps: int -> unit
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  val get_timeout: unit -> int
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  val set_timeout: int -> unit
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  val kill: unit -> unit
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  val info: unit -> unit
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  val messages: int option -> unit
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  type prover = int -> int -> Proof.state -> bool * string
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  val add_prover: string -> prover -> theory -> theory
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  val print_provers: theory -> unit
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  val sledgehammer: string list -> Proof.state -> unit
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end;
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structure AtpManager: ATP_MANAGER =
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struct
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(** preferences **)
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val message_store_limit = 20;
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val message_display_limit = 5;
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local
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val atps = ref "e remote_vampire";
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val max_atps = ref 5;   (* ~1 means infinite number of atps *)
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val timeout = ref 60;
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in
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fun get_atps () = CRITICAL (fn () => ! atps);
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fun set_atps str = CRITICAL (fn () => atps := str);
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fun get_max_atps () = CRITICAL (fn () => ! max_atps);
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fun set_max_atps number = CRITICAL (fn () => max_atps := number);
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fun get_timeout () = CRITICAL (fn () => ! timeout);
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fun set_timeout time = CRITICAL (fn () => timeout := time);
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val _ =
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  ProofGeneralPgip.add_preference "Proof"
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    (Preferences.string_pref atps
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      "ATP: provers" "Default automatic provers (separated by whitespace)");
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val _ = ProofGeneralPgip.add_preference "Proof"
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    (Preferences.int_pref max_atps
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      "ATP: maximum number" "How many provers may run in parallel");
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val _ = ProofGeneralPgip.add_preference "Proof"
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    (Preferences.int_pref timeout
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      "ATP: timeout" "ATPs will be interrupted after this time (in seconds)");
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end;
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(** thread management **)
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(* data structures over threads *)
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structure ThreadHeap = HeapFun
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(
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  type elem = Time.time * Thread.thread;
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  fun ord ((a, _), (b, _)) = Time.compare (a, b);
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);
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val lookup_thread = AList.lookup Thread.equal;
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val delete_thread = AList.delete Thread.equal;
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val update_thread = AList.update Thread.equal;
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(* state of thread manager *)
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datatype T = State of
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 {timeout_heap: ThreadHeap.T,
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  oldest_heap: ThreadHeap.T,
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  active: (Thread.thread * (Time.time * Time.time * string)) list,
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  cancelling: (Thread.thread * (Time.time * Time.time * string)) list,
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  messages: string list,
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  store: string list};
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fun make_state timeout_heap oldest_heap active cancelling messages store =
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  State {timeout_heap = timeout_heap, oldest_heap = oldest_heap,
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    active = active, cancelling = cancelling, messages = messages, store = store};
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val state = Synchronized.var "atp_manager" (make_state ThreadHeap.empty ThreadHeap.empty [] [] [] []);
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(* the managing thread *)
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(*watches over running threads and interrupts them if required*)
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val managing_thread = ref (NONE: Thread.thread option);
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(* unregister thread *)
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fun unregister (success, message) thread = Synchronized.change state
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  (fn state as State {timeout_heap, oldest_heap, active, cancelling, messages, store} =>
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    (case lookup_thread active thread of
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      SOME (birthtime, _, description) =>
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        let
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          val (group, active') =
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            if success then List.partition (fn (_, (tb, _, _)) => tb = birthtime) active
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            else List.partition (fn (th, _) => Thread.equal (th, thread)) active
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          val now = Time.now ()
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          val cancelling' =
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            fold (fn (th, (tb, _, desc)) => update_thread (th, (tb, now, desc))) group cancelling
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          val message' = description ^ "\n" ^ message ^
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            (if length group <= 1 then ""
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             else "\nInterrupted " ^ string_of_int (length group - 1) ^ " other group members")
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          val store' = message' ::
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            (if length store <= message_store_limit then store
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             else #1 (chop message_store_limit store))
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        in make_state timeout_heap oldest_heap active' cancelling' (message' :: messages) store' end
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    | NONE =>state));
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(* kill excessive atp threads *)
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fun excessive_atps active =
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  let val max = get_max_atps ()
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  in length active > max andalso max > ~1 end;
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local
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fun kill_oldest () =
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  let exception Unchanged in
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    Synchronized.change_result state
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      (fn State {timeout_heap, oldest_heap, active, cancelling, messages, store} =>
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        if ThreadHeap.is_empty oldest_heap orelse not (excessive_atps active)
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        then raise Unchanged
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        else
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          let val ((_, oldest_thread), oldest_heap') = ThreadHeap.min_elem oldest_heap
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          in (oldest_thread, make_state timeout_heap oldest_heap' active cancelling messages store) end)
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      |> unregister (false, "Interrupted (maximum number of ATPs exceeded)")
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    handle Unchanged => ()
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  end;
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in
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fun kill_excessive () =
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  let val State {active, ...} = Synchronized.value state
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  in if excessive_atps active then (kill_oldest (); kill_excessive ()) else () end;
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end;
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fun print_new_messages () =
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  let val to_print = Synchronized.change_result state
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    (fn State {timeout_heap, oldest_heap, active, cancelling, messages, store} =>
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    (messages, make_state timeout_heap oldest_heap active cancelling [] store))  
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  in if null to_print then ()
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  else priority ("Sledgehammer: " ^ (space_implode "\n\n" to_print)) end;
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(* start a watching thread which runs forever -- only one may exist *)
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fun check_thread_manager () = CRITICAL (fn () =>
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  if (case ! managing_thread of SOME thread => Thread.isActive thread | NONE => false)
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  then () else managing_thread := SOME (SimpleThread.fork false (fn () =>
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    let
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      val min_wait_time = Time.fromMilliseconds 300
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      val max_wait_time = Time.fromSeconds 10
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      (* wait for next thread to cancel, or maximum*)
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      fun time_limit (State {timeout_heap, ...}) =
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        (case try ThreadHeap.min timeout_heap of
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          NONE => SOME (Time.+ (Time.now (), max_wait_time))
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        | SOME (time, _) => SOME time)
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      (* action: find threads whose timeout is reached, and interrupt cancelling threads *)
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      fun action (State {timeout_heap, oldest_heap, active, cancelling, messages, store}) =
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        let val (timeout_threads, timeout_heap') =
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          ThreadHeap.upto (Time.now (), Thread.self ()) timeout_heap
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        in
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          if null timeout_threads andalso null cancelling andalso not (excessive_atps active)
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          then NONE
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          else
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            let
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              val _ = List.app (SimpleThread.interrupt o #1) cancelling
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              val cancelling' = filter (Thread.isActive o #1) cancelling
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              val state' = make_state timeout_heap' oldest_heap active cancelling' messages store
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            in SOME (map #2 timeout_threads, state') end
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        end
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    in
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      while true do
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       (Synchronized.timed_access state time_limit action
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        |> these
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        |> List.app (unregister (false, "Interrupted (reached timeout)"));
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        kill_excessive ();
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        print_new_messages ();
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        (*give threads time to respond to interrupt*)
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        OS.Process.sleep min_wait_time)
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    end)));
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(* thread is registered here by sledgehammer *)
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fun register birthtime deadtime (thread, desc) =
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 (check_thread_manager ();
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  Synchronized.change state
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    (fn State {timeout_heap, oldest_heap, active, cancelling, messages, store} =>
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      let
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        val timeout_heap' = ThreadHeap.insert (deadtime, thread) timeout_heap
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        val oldest_heap' = ThreadHeap.insert (birthtime, thread) oldest_heap
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        val active' = update_thread (thread, (birthtime, deadtime, desc)) active
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      in make_state timeout_heap' oldest_heap' active' cancelling messages store end));
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(** user commands **)
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(* kill: move all threads to cancelling *)
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fun kill () = Synchronized.change state
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  (fn State {timeout_heap, oldest_heap, active, cancelling, messages, store} =>
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    let val formerly_active = map (fn (th, (tb, _, desc)) => (th, (tb, Time.now (), desc))) active
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    in make_state timeout_heap oldest_heap [] (formerly_active @ cancelling) messages store end);
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(* ATP info *)
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fun info () =
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  let
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    val State {active, cancelling, ...} = Synchronized.value state
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    fun running_info (_, (birth_time, dead_time, desc)) = "Running: "
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        ^ (string_of_int o Time.toSeconds) (Time.- (Time.now (), birth_time))
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        ^ " s  --  "
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        ^ (string_of_int o Time.toSeconds) (Time.- (dead_time, Time.now ()))
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        ^ " s to live:\n" ^ desc
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    fun cancelling_info (_, (_, dead_time, desc)) = "Trying to interrupt thread since "
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        ^ (string_of_int o Time.toSeconds) (Time.- (Time.now (), dead_time))
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        ^ " s:\n" ^ desc
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    val running =
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      if null active then "No ATPs running."
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      else space_implode "\n\n" ("Running ATPs:" :: map running_info active)
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    val interrupting =
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      if null cancelling then ""
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      else space_implode "\n\n"
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        ("Trying to interrupt the following ATPs:" :: map cancelling_info cancelling)
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  in writeln (running ^ "\n" ^ interrupting) end;
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fun messages opt_limit =
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  let
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    val limit = the_default message_display_limit opt_limit;
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    val State {store = msgs, ...} = Synchronized.value state
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    val header = "Recent ATP messages" ^
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      (if length msgs <= limit then ":" else " (" ^ string_of_int limit ^ " displayed):");
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  in writeln (space_implode "\n\n" (header :: #1 (chop limit msgs))) end;
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(** The Sledgehammer **)
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(* named provers *)
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type prover = int -> int -> Proof.state -> bool * string;
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fun err_dup_prover name = error ("Duplicate prover: " ^ quote name);
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structure Provers = TheoryDataFun
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(
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  type T = (prover * stamp) Symtab.table
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  val empty = Symtab.empty
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  val copy = I
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  val extend = I
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  fun merge _ tabs : T = Symtab.merge (eq_snd op =) tabs
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    handle Symtab.DUP dup => err_dup_prover dup
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);
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fun add_prover name prover thy =
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  Provers.map (Symtab.update_new (name, (prover, stamp ()))) thy
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    handle Symtab.DUP dup => err_dup_prover dup;
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fun print_provers thy = Pretty.writeln
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  (Pretty.strs ("external provers:" :: sort_strings (Symtab.keys (Provers.get thy))));
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(* start prover thread *)
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fun start_prover name birthtime deadtime i proof_state =
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  (case Symtab.lookup (Provers.get (Proof.theory_of proof_state)) name of
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    NONE => warning ("Unknown external prover: " ^ quote name)
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  | SOME (prover, _) =>
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      let
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        val (ctxt, (_, goal)) = Proof.get_goal proof_state
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        val desc =
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          "external prover " ^ quote name ^ " for subgoal " ^ string_of_int i ^ ":\n" ^
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            Syntax.string_of_term ctxt (Thm.term_of (Thm.cprem_of goal i))
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        val _ = SimpleThread.fork true (fn () =>
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          let
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            val _ = register birthtime deadtime (Thread.self (), desc)
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            val result = prover (get_timeout ()) i proof_state
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              handle ResHolClause.TOO_TRIVIAL
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                => (true, "Empty clause: Try this command: " ^ Markup.markup Markup.sendback "apply metis")
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              | ERROR msg
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                => (false, "Error: " ^ msg)
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            val _ = unregister result (Thread.self ())
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          in () end handle Interrupt => ())
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      in () end);
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(* sledghammer for first subgoal *)
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fun sledgehammer names proof_state =
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  let
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    val provers =
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      if null names then String.tokens (Symbol.is_ascii_blank o String.str) (get_atps ())
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      else names
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    val birthtime = Time.now ()
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    val deadtime = Time.+ (birthtime, Time.fromSeconds (get_timeout ()))
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  in List.app (fn name => start_prover name birthtime deadtime 1 proof_state) provers end;
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(** Isar command syntax **)
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local structure K = OuterKeyword and P = OuterParse in
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val _ =
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  OuterSyntax.improper_command "atp_kill" "kill all managed provers" K.diag
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    (Scan.succeed (Toplevel.no_timing o Toplevel.imperative kill));
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val _ =
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  OuterSyntax.improper_command "atp_info" "print information about managed provers" K.diag
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    (Scan.succeed (Toplevel.no_timing o Toplevel.imperative info));
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val _ =
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  OuterSyntax.improper_command "atp_messages" "print recent messages issued by managed provers" K.diag
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    (Scan.option (P.$$$ "(" |-- P.nat --| P.$$$ ")") >>
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      (fn limit => Toplevel.no_timing o Toplevel.imperative (fn () => messages limit)));
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val _ =
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  OuterSyntax.improper_command "print_atps" "print external provers" K.diag
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    (Scan.succeed (Toplevel.no_timing o Toplevel.unknown_theory o
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      Toplevel.keep (print_provers o Toplevel.theory_of)));
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val _ =
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  OuterSyntax.command "sledgehammer" "call all automatic theorem provers" K.diag
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    (Scan.repeat P.xname >> (fn names => Toplevel.no_timing o Toplevel.unknown_proof o
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      Toplevel.keep ((sledgehammer names) o Toplevel.proof_of)));
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end;
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end;