src/Pure/goal.ML
author wenzelm
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tuned signature -- more explicit flags for low-level Thm.bicompose;
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(*  Title:      Pure/goal.ML
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    Author:     Makarius
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Goals in tactical theorem proving, with support for forked proofs.
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*)
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signature BASIC_GOAL =
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sig
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  val skip_proofs: bool Unsynchronized.ref
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  val parallel_proofs: int Unsynchronized.ref
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  val SELECT_GOAL: tactic -> int -> tactic
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  val CONJUNCTS: tactic -> int -> tactic
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  val PRECISE_CONJUNCTS: int -> tactic -> int -> tactic
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  val PARALLEL_CHOICE: tactic list -> tactic
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  val PARALLEL_GOALS: tactic -> tactic
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end;
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signature GOAL =
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sig
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  include BASIC_GOAL
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  val init: cterm -> thm
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  val protect: thm -> thm
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  val conclude: thm -> thm
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  val check_finished: Proof.context -> thm -> thm
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  val finish: Proof.context -> thm -> thm
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  val norm_result: thm -> thm
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  val fork_params: {name: string, pos: Position.T, pri: int} -> (unit -> 'a) -> 'a future
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  val fork: int -> (unit -> 'a) -> 'a future
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  val peek_futures: serial -> unit future list
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  val reset_futures: unit -> Future.group list
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  val shutdown_futures: unit -> unit
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  val future_enabled_level: int -> bool
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  val future_enabled: unit -> bool
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  val future_enabled_nested: int -> bool
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  val future_enabled_timing: Time.time -> bool
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  val future_result: Proof.context -> thm future -> term -> thm
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  val prove_internal: cterm list -> cterm -> (thm list -> tactic) -> thm
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  val is_schematic: term -> bool
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  val prove_multi: Proof.context -> string list -> term list -> term list ->
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    ({prems: thm list, context: Proof.context} -> tactic) -> thm list
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  val prove_future: Proof.context -> string list -> term list -> term ->
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    ({prems: thm list, context: Proof.context} -> tactic) -> thm
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  val prove: Proof.context -> string list -> term list -> term ->
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    ({prems: thm list, context: Proof.context} -> tactic) -> thm
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  val prove_global_future: theory -> string list -> term list -> term ->
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    ({prems: thm list, context: Proof.context} -> tactic) -> thm
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  val prove_global: theory -> string list -> term list -> term ->
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    ({prems: thm list, context: Proof.context} -> tactic) -> thm
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  val prove_sorry: Proof.context -> string list -> term list -> term ->
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    ({prems: thm list, context: Proof.context} -> tactic) -> thm
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  val prove_sorry_global: theory -> string list -> term list -> term ->
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    ({prems: thm list, context: Proof.context} -> tactic) -> thm
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  val extract: int -> int -> thm -> thm Seq.seq
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  val retrofit: int -> int -> thm -> thm -> thm Seq.seq
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  val conjunction_tac: int -> tactic
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  val precise_conjunction_tac: int -> int -> tactic
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  val recover_conjunction_tac: tactic
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  val norm_hhf_tac: int -> tactic
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  val assume_rule_tac: Proof.context -> int -> tactic
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end;
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structure Goal: GOAL =
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struct
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(** goals **)
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(*
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  -------- (init)
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  C ==> #C
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*)
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val init =
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  let val A = #1 (Thm.dest_implies (Thm.cprop_of Drule.protectI))
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  in fn C => Thm.instantiate ([], [(A, C)]) Drule.protectI end;
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(*
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   C
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  --- (protect)
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  #C
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*)
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fun protect th = Drule.comp_no_flatten (th, 0) 1 Drule.protectI;
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(*
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  A ==> ... ==> #C
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  ---------------- (conclude)
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  A ==> ... ==> C
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*)
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fun conclude th = Drule.comp_no_flatten (th, Thm.nprems_of th) 1 Drule.protectD;
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(*
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  #C
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  --- (finish)
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   C
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*)
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fun check_finished ctxt th =
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  if Thm.no_prems th then th
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  else
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    raise THM ("Proof failed.\n" ^ Pretty.string_of (Goal_Display.pretty_goal ctxt th), 0, [th]);
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fun finish ctxt = check_finished ctxt #> conclude;
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(** results **)
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(* normal form *)
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val norm_result =
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  Drule.flexflex_unique
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  #> Raw_Simplifier.norm_hhf_protect
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  #> Thm.strip_shyps
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  #> Drule.zero_var_indexes;
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(* forked proofs *)
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local
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val forked_proofs =
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  Synchronized.var "forked_proofs"
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    (0, []: Future.group list, Inttab.empty: unit future list Inttab.table);
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fun count_forked i =
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  Synchronized.change forked_proofs (fn (m, groups, tab) =>
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    let
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      val n = m + i;
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      val _ = Future.forked_proofs := n;
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    in (n, groups, tab) end);
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fun register_forked id future =
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  Synchronized.change forked_proofs (fn (m, groups, tab) =>
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    let
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      val groups' = Task_Queue.group_of_task (Future.task_of future) :: groups;
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      val tab' = Inttab.cons_list (id, Future.map (K ()) future) tab;
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    in (m, groups', tab') end);
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fun status task markups =
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  let val props = Markup.properties [(Markup.taskN, Task_Queue.str_of_task task)]
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  in Output.status (implode (map (Markup.markup_only o props) markups)) end;
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in
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fun fork_params {name, pos, pri} e =
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  uninterruptible (fn _ => Position.setmp_thread_data pos (fn () =>
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    let
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      val id = the_default 0 (Position.parse_id pos);
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      val _ = count_forked 1;
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      val future =
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        (singleton o Future.forks)
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          {name = name, group = NONE, deps = [], pri = pri, interrupts = false}
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          (fn () =>
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            let
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              val task = the (Future.worker_task ());
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              val _ = status task [Markup.running];
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              val result =
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                Exn.capture (Future.interruptible_task e) ()
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                |> Future.identify_result pos;
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              val _ = status task [Markup.finished, Markup.joined];
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              val _ =
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                (case result of
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                  Exn.Res _ => ()
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                | Exn.Exn exn =>
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                    if id = 0 orelse Exn.is_interrupt exn then ()
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                    else
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                      (status task [Markup.failed];
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                       Output.report (Markup.markup_only Markup.bad);
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                       List.app (Future.error_msg pos) (ML_Compiler.exn_messages_ids exn)));
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              val _ = count_forked ~1;
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            in Exn.release result end);
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      val _ = status (Future.task_of future) [Markup.forked];
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      val _ = register_forked id future;
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    in future end)) ();
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fun fork pri e =
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  fork_params {name = "Goal.fork", pos = Position.thread_data (), pri = pri} e;
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fun forked_count () = #1 (Synchronized.value forked_proofs);
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fun peek_futures id =
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  Inttab.lookup_list (#3 (Synchronized.value forked_proofs)) id;
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fun reset_futures () =
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  Synchronized.change_result forked_proofs (fn (_, groups, _) =>
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    (Future.forked_proofs := 0; (groups, (0, [], Inttab.empty))));
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fun shutdown_futures () =
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  (Future.shutdown ();
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    (case map_filter Task_Queue.group_status (reset_futures ()) of
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      [] => ()
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    | exns => raise Par_Exn.make exns));
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end;
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(* scheduling parameters *)
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val skip_proofs = Unsynchronized.ref false;
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val parallel_proofs = Unsynchronized.ref 1;
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fun future_enabled_level n =
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  Multithreading.enabled () andalso ! parallel_proofs >= n andalso
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  is_some (Future.worker_task ());
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fun future_enabled () = future_enabled_level 1;
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fun future_enabled_nested n =
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  future_enabled_level n andalso
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  forked_count () <
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    Options.default_int "parallel_subproofs_saturation" * Multithreading.max_threads_value ();
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fun future_enabled_timing t =
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  future_enabled () andalso
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    Time.toReal t >= Options.default_real "parallel_subproofs_threshold";
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(* future_result *)
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fun future_result ctxt result prop =
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  let
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    val thy = Proof_Context.theory_of ctxt;
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    val _ = Context.reject_draft thy;
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    val cert = Thm.cterm_of thy;
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    val certT = Thm.ctyp_of thy;
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    val assms = Assumption.all_assms_of ctxt;
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    val As = map Thm.term_of assms;
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    val xs = map Free (fold Term.add_frees (prop :: As) []);
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    val fixes = map cert xs;
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    val tfrees = fold Term.add_tfrees (prop :: As) [];
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    val instT = map (fn (a, S) => (certT (TVar ((a, 0), S)), certT (TFree (a, S)))) tfrees;
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    val global_prop =
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      cert (Logic.varify_types_global (fold_rev Logic.all xs (Logic.list_implies (As, prop))))
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      |> Thm.weaken_sorts (Variable.sorts_of ctxt);
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    val global_result = result |> Future.map
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      (Drule.flexflex_unique #>
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        Thm.adjust_maxidx_thm ~1 #>
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        Drule.implies_intr_list assms #>
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        Drule.forall_intr_list fixes #>
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        Thm.generalize (map #1 tfrees, []) 0 #>
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        Thm.strip_shyps);
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    val local_result =
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      Thm.future global_result global_prop
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      |> Thm.close_derivation
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      |> Thm.instantiate (instT, [])
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      |> Drule.forall_elim_list fixes
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      |> fold (Thm.elim_implies o Thm.assume) assms;
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  in local_result end;
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(** tactical theorem proving **)
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(* prove_internal -- minimal checks, no normalization of result! *)
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fun prove_internal casms cprop tac =
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  (case SINGLE (tac (map Assumption.assume casms)) (init cprop) of
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    SOME th => Drule.implies_intr_list casms
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      (finish (Syntax.init_pretty_global (Thm.theory_of_thm th)) th)
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  | NONE => error "Tactic failed");
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(* prove variations *)
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fun is_schematic t =
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  Term.exists_subterm Term.is_Var t orelse
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  Term.exists_type (Term.exists_subtype Term.is_TVar) t;
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fun prove_common immediate ctxt xs asms props tac =
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  let
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    val thy = Proof_Context.theory_of ctxt;
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    val string_of_term = Syntax.string_of_term ctxt;
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    val schematic = exists is_schematic props;
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    val future = future_enabled ();
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    val skip = not immediate andalso not schematic andalso future andalso ! skip_proofs;
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    val pos = Position.thread_data ();
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    fun err msg = cat_error msg
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      ("The error(s) above occurred for the goal statement:\n" ^
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        string_of_term (Logic.list_implies (asms, Logic.mk_conjunction_list props)) ^
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        (case Position.here pos of "" => "" | s => "\n" ^ s));
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    fun cert_safe t = Thm.cterm_of thy (Envir.beta_norm (Term.no_dummy_patterns t))
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      handle TERM (msg, _) => err msg | TYPE (msg, _, _) => err msg;
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   289
    val casms = map cert_safe asms;
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   290
    val cprops = map cert_safe props;
17980
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   291
20250
c3f209752749 prove: proper assumption context, more tactic arguments;
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   292
    val (prems, ctxt') = ctxt
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   293
      |> Variable.add_fixes_direct xs
27218
4548c83cd508 prove: full Variable.declare_term, including constraints;
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   294
      |> fold Variable.declare_term (asms @ props)
26713
1c6181def1d0 prove_global: Variable.set_body true, pass context;
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   295
      |> Assumption.add_assumes casms
1c6181def1d0 prove_global: Variable.set_body true, pass context;
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   296
      ||> Variable.set_body true;
28619
89f9dd800a22 prove_common: include all sorts from context into statement, check shyps of result;
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   297
    val sorts = Variable.sorts_of ctxt';
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   298
28619
89f9dd800a22 prove_common: include all sorts from context into statement, check shyps of result;
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   299
    val stmt = Thm.weaken_sorts sorts (Conjunction.mk_conjunction_balanced cprops);
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   300
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63327f679cff more ambitious Goal.skip_proofs: covers Goal.prove forms as well, and do not insist in quick_and_dirty (for the sake of Isabelle/jEdit);
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   301
    fun tac' args st =
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   302
      if skip then ALLGOALS Skip_Proof.cheat_tac st before Skip_Proof.report ctxt
63327f679cff more ambitious Goal.skip_proofs: covers Goal.prove forms as well, and do not insist in quick_and_dirty (for the sake of Isabelle/jEdit);
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   303
      else tac args st;
28340
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   304
    fun result () =
51553
63327f679cff more ambitious Goal.skip_proofs: covers Goal.prove forms as well, and do not insist in quick_and_dirty (for the sake of Isabelle/jEdit);
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diff changeset
   305
      (case SINGLE (tac' {prems = prems, context = ctxt'}) (init stmt) of
38875
c7a66b584147 tuned messages: discontinued spurious full-stops (messages are occasionally composed unexpectedly);
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   306
        NONE => err "Tactic failed"
28340
e8597242f649 added promise_result, prove_promise;
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   307
      | SOME st =>
32197
bc341bbe4417 Goal.finish: explicit context for printing;
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parents: 32187
diff changeset
   308
          let val res = finish ctxt' st handle THM (msg, _, _) => err msg in
28619
89f9dd800a22 prove_common: include all sorts from context into statement, check shyps of result;
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diff changeset
   309
            if Unify.matches_list thy [Thm.term_of stmt] [Thm.prop_of res]
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   310
            then Thm.check_shyps sorts res
28340
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   311
            else err ("Proved a different theorem: " ^ string_of_term (Thm.prop_of res))
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   312
          end);
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   313
    val res =
51553
63327f679cff more ambitious Goal.skip_proofs: covers Goal.prove forms as well, and do not insist in quick_and_dirty (for the sake of Isabelle/jEdit);
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   314
      if immediate orelse schematic orelse not future orelse skip
29088
95a239a5e055 future proofs: more robust check via Future.enabled;
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   315
      then result ()
51222
8c3e5fb41139 improved scheduling of forked proofs, based on elapsed time estimate (from last run via session log file);
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parents: 51118
diff changeset
   316
      else future_result ctxt' (fork ~1 result) (Thm.term_of stmt);
17980
788836292b1a Internal goals.
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   317
  in
28340
e8597242f649 added promise_result, prove_promise;
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   318
    Conjunction.elim_balanced (length props) res
20290
3f886c176c9b normalized Proof.context/method type aliases;
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diff changeset
   319
    |> map (Assumption.export false ctxt' ctxt)
20056
0698a403a066 prove/prove_multi: context;
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   320
    |> Variable.export ctxt' ctxt
20250
c3f209752749 prove: proper assumption context, more tactic arguments;
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diff changeset
   321
    |> map Drule.zero_var_indexes
17980
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   322
  end;
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   323
28341
383f512314b9 prove_multi: immediate;
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diff changeset
   324
val prove_multi = prove_common true;
17980
788836292b1a Internal goals.
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parents:
diff changeset
   325
28446
a01de3b3fa2e renamed promise to future, tuned related interfaces;
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parents: 28363
diff changeset
   326
fun prove_future ctxt xs asms prop tac = hd (prove_common false ctxt xs asms [prop] tac);
51118
32a5994dd205 tuned signature -- legacy packages might want to fork proofs as well;
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parents: 51110
diff changeset
   327
28340
e8597242f649 added promise_result, prove_promise;
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parents: 27218
diff changeset
   328
fun prove ctxt xs asms prop tac = hd (prove_common true ctxt xs asms [prop] tac);
20056
0698a403a066 prove/prove_multi: context;
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   329
51118
32a5994dd205 tuned signature -- legacy packages might want to fork proofs as well;
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parents: 51110
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   330
fun prove_global_future thy xs asms prop tac =
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parents: 51110
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   331
  Drule.export_without_context (prove_future (Proof_Context.init_global thy) xs asms prop tac);
32a5994dd205 tuned signature -- legacy packages might want to fork proofs as well;
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parents: 51110
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   332
20056
0698a403a066 prove/prove_multi: context;
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parents: 19862
diff changeset
   333
fun prove_global thy xs asms prop tac =
42360
da8817d01e7c modernized structure Proof_Context;
wenzelm
parents: 41819
diff changeset
   334
  Drule.export_without_context (prove (Proof_Context.init_global thy) xs asms prop tac);
18027
09ab79d4e8e1 renamed Goal constant to prop, more general protect/unprotect interfaces;
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parents: 17986
diff changeset
   335
51551
88d1d19fb74f tuned signature and module arrangement;
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parents: 51423
diff changeset
   336
fun prove_sorry ctxt xs asms prop tac =
52059
2f970c7f722b proper option quick_and_dirty;
wenzelm
parents: 51958
diff changeset
   337
  if Config.get ctxt quick_and_dirty then
51552
c713c9505f68 clarified Skip_Proof.cheat_tac: more standard tactic;
wenzelm
parents: 51551
diff changeset
   338
    prove ctxt xs asms prop (fn _ => ALLGOALS Skip_Proof.cheat_tac)
51551
88d1d19fb74f tuned signature and module arrangement;
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parents: 51423
diff changeset
   339
  else (if future_enabled () then prove_future else prove) ctxt xs asms prop tac;
88d1d19fb74f tuned signature and module arrangement;
wenzelm
parents: 51423
diff changeset
   340
88d1d19fb74f tuned signature and module arrangement;
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parents: 51423
diff changeset
   341
fun prove_sorry_global thy xs asms prop tac =
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parents: 51423
diff changeset
   342
  Drule.export_without_context
88d1d19fb74f tuned signature and module arrangement;
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parents: 51423
diff changeset
   343
    (prove_sorry (Proof_Context.init_global thy) xs asms prop tac);
88d1d19fb74f tuned signature and module arrangement;
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parents: 51423
diff changeset
   344
18027
09ab79d4e8e1 renamed Goal constant to prop, more general protect/unprotect interfaces;
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parents: 17986
diff changeset
   345
17980
788836292b1a Internal goals.
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parents:
diff changeset
   346
21687
f689f729afab reorganized structure Goal vs. Tactic;
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parents: 21604
diff changeset
   347
(** goal structure **)
f689f729afab reorganized structure Goal vs. Tactic;
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diff changeset
   348
f689f729afab reorganized structure Goal vs. Tactic;
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parents: 21604
diff changeset
   349
(* nested goals *)
18207
9edbeda7e39a tuned norm_hhf_protected;
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parents: 18180
diff changeset
   350
19184
3e30297e1300 added extract, retrofit;
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parents: 18678
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   351
fun extract i n st =
3e30297e1300 added extract, retrofit;
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parents: 18678
diff changeset
   352
  (if i < 1 orelse n < 1 orelse i + n - 1 > Thm.nprems_of st then Seq.empty
3e30297e1300 added extract, retrofit;
wenzelm
parents: 18678
diff changeset
   353
   else if n = 1 then Seq.single (Thm.cprem_of st i)
23418
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   354
   else
c195f6f13769 balanced conjunctions;
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parents: 23414
diff changeset
   355
     Seq.single (Conjunction.mk_conjunction_balanced (map (Thm.cprem_of st) (i upto i + n - 1))))
20260
990dbc007ca6 Thm.adjust_maxidx;
wenzelm
parents: 20250
diff changeset
   356
  |> Seq.map (Thm.adjust_maxidx_cterm ~1 #> init);
17980
788836292b1a Internal goals.
wenzelm
parents:
diff changeset
   357
19221
wenzelm
parents: 19191
diff changeset
   358
fun retrofit i n st' st =
wenzelm
parents: 19191
diff changeset
   359
  (if n = 1 then st
23418
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   360
   else st |> Drule.with_subgoal i (Conjunction.uncurry_balanced n))
52223
5bb6ae8acb87 tuned signature -- more explicit flags for low-level Thm.bicompose;
wenzelm
parents: 52104
diff changeset
   361
  |> Thm.bicompose {flatten = false, match = false, incremented = false}
5bb6ae8acb87 tuned signature -- more explicit flags for low-level Thm.bicompose;
wenzelm
parents: 52104
diff changeset
   362
      (false, conclude st', Thm.nprems_of st') i;
18207
9edbeda7e39a tuned norm_hhf_protected;
wenzelm
parents: 18180
diff changeset
   363
17980
788836292b1a Internal goals.
wenzelm
parents:
diff changeset
   364
fun SELECT_GOAL tac i st =
19191
56cda3ec2ef8 SELECT_GOAL: fixed trivial case;
wenzelm
parents: 19184
diff changeset
   365
  if Thm.nprems_of st = 1 andalso i = 1 then tac st
19184
3e30297e1300 added extract, retrofit;
wenzelm
parents: 18678
diff changeset
   366
  else Seq.lifts (retrofit i 1) (Seq.maps tac (extract i 1 st)) st;
17980
788836292b1a Internal goals.
wenzelm
parents:
diff changeset
   367
21687
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   368
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   369
(* multiple goals *)
f689f729afab reorganized structure Goal vs. Tactic;
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parents: 21604
diff changeset
   370
23418
c195f6f13769 balanced conjunctions;
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parents: 23414
diff changeset
   371
fun precise_conjunction_tac 0 i = eq_assume_tac i
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   372
  | precise_conjunction_tac 1 i = SUBGOAL (K all_tac) i
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   373
  | precise_conjunction_tac n i = PRIMITIVE (Drule.with_subgoal i (Conjunction.curry_balanced n));
23414
927203ad4b3a tuned conjunction tactics: slightly smaller proof terms;
wenzelm
parents: 23356
diff changeset
   374
23418
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   375
val adhoc_conjunction_tac = REPEAT_ALL_NEW
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   376
  (SUBGOAL (fn (goal, i) =>
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   377
    if can Logic.dest_conjunction goal then rtac Conjunction.conjunctionI i
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   378
    else no_tac));
21687
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   379
23418
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   380
val conjunction_tac = SUBGOAL (fn (goal, i) =>
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   381
  precise_conjunction_tac (length (Logic.dest_conjunctions goal)) i ORELSE
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   382
  TRY (adhoc_conjunction_tac i));
21687
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   383
23418
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   384
val recover_conjunction_tac = PRIMITIVE (fn th =>
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   385
  Conjunction.uncurry_balanced (Thm.nprems_of th) th);
23414
927203ad4b3a tuned conjunction tactics: slightly smaller proof terms;
wenzelm
parents: 23356
diff changeset
   386
927203ad4b3a tuned conjunction tactics: slightly smaller proof terms;
wenzelm
parents: 23356
diff changeset
   387
fun PRECISE_CONJUNCTS n tac =
927203ad4b3a tuned conjunction tactics: slightly smaller proof terms;
wenzelm
parents: 23356
diff changeset
   388
  SELECT_GOAL (precise_conjunction_tac n 1
927203ad4b3a tuned conjunction tactics: slightly smaller proof terms;
wenzelm
parents: 23356
diff changeset
   389
    THEN tac
23418
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   390
    THEN recover_conjunction_tac);
23414
927203ad4b3a tuned conjunction tactics: slightly smaller proof terms;
wenzelm
parents: 23356
diff changeset
   391
21687
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   392
fun CONJUNCTS tac =
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   393
  SELECT_GOAL (conjunction_tac 1
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   394
    THEN tac
23418
c195f6f13769 balanced conjunctions;
wenzelm
parents: 23414
diff changeset
   395
    THEN recover_conjunction_tac);
21687
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   396
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   397
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   398
(* hhf normal form *)
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   399
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   400
val norm_hhf_tac =
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   401
  rtac Drule.asm_rl  (*cheap approximation -- thanks to builtin Logic.flatten_params*)
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   402
  THEN' SUBGOAL (fn (t, i) =>
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   403
    if Drule.is_norm_hhf t then all_tac
41228
e1fce873b814 renamed structure MetaSimplifier to raw_Simplifer, to emphasize its meaning;
wenzelm
parents: 39125
diff changeset
   404
    else rewrite_goal_tac Drule.norm_hhf_eqs i);
21687
f689f729afab reorganized structure Goal vs. Tactic;
wenzelm
parents: 21604
diff changeset
   405
23237
ac9d126456e1 added assume_rule_tac;
wenzelm
parents: 22902
diff changeset
   406
ac9d126456e1 added assume_rule_tac;
wenzelm
parents: 22902
diff changeset
   407
(* non-atomic goal assumptions *)
ac9d126456e1 added assume_rule_tac;
wenzelm
parents: 22902
diff changeset
   408
23356
dbe3731241c3 renamed prove_raw to prove_internal;
wenzelm
parents: 23237
diff changeset
   409
fun non_atomic (Const ("==>", _) $ _ $ _) = true
dbe3731241c3 renamed prove_raw to prove_internal;
wenzelm
parents: 23237
diff changeset
   410
  | non_atomic (Const ("all", _) $ _) = true
dbe3731241c3 renamed prove_raw to prove_internal;
wenzelm
parents: 23237
diff changeset
   411
  | non_atomic _ = false;
dbe3731241c3 renamed prove_raw to prove_internal;
wenzelm
parents: 23237
diff changeset
   412
23237
ac9d126456e1 added assume_rule_tac;
wenzelm
parents: 22902
diff changeset
   413
fun assume_rule_tac ctxt = norm_hhf_tac THEN' CSUBGOAL (fn (goal, i) =>
ac9d126456e1 added assume_rule_tac;
wenzelm
parents: 22902
diff changeset
   414
  let
42495
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42371
diff changeset
   415
    val ((_, goal'), ctxt') = Variable.focus_cterm goal ctxt;
23237
ac9d126456e1 added assume_rule_tac;
wenzelm
parents: 22902
diff changeset
   416
    val goal'' = Drule.cterm_rule (singleton (Variable.export ctxt' ctxt)) goal';
23356
dbe3731241c3 renamed prove_raw to prove_internal;
wenzelm
parents: 23237
diff changeset
   417
    val Rs = filter (non_atomic o Thm.term_of) (Drule.strip_imp_prems goal'');
23237
ac9d126456e1 added assume_rule_tac;
wenzelm
parents: 22902
diff changeset
   418
    val tacs = Rs |> map (fn R =>
41228
e1fce873b814 renamed structure MetaSimplifier to raw_Simplifer, to emphasize its meaning;
wenzelm
parents: 39125
diff changeset
   419
      Tactic.etac (Raw_Simplifier.norm_hhf (Thm.trivial R)) THEN_ALL_NEW assume_tac);
23237
ac9d126456e1 added assume_rule_tac;
wenzelm
parents: 22902
diff changeset
   420
  in fold_rev (curry op APPEND') tacs (K no_tac) i end);
ac9d126456e1 added assume_rule_tac;
wenzelm
parents: 22902
diff changeset
   421
32365
9b74d0339c44 added PARALLEL_CHOICE, PARALLEL_GOALS;
wenzelm
parents: 32255
diff changeset
   422
9b74d0339c44 added PARALLEL_CHOICE, PARALLEL_GOALS;
wenzelm
parents: 32255
diff changeset
   423
(* parallel tacticals *)
9b74d0339c44 added PARALLEL_CHOICE, PARALLEL_GOALS;
wenzelm
parents: 32255
diff changeset
   424
9b74d0339c44 added PARALLEL_CHOICE, PARALLEL_GOALS;
wenzelm
parents: 32255
diff changeset
   425
(*parallel choice of single results*)
9b74d0339c44 added PARALLEL_CHOICE, PARALLEL_GOALS;
wenzelm
parents: 32255
diff changeset
   426
fun PARALLEL_CHOICE tacs st =
9b74d0339c44 added PARALLEL_CHOICE, PARALLEL_GOALS;
wenzelm
parents: 32255
diff changeset
   427
  (case Par_List.get_some (fn tac => SINGLE tac st) tacs of
9b74d0339c44 added PARALLEL_CHOICE, PARALLEL_GOALS;
wenzelm
parents: 32255
diff changeset
   428
    NONE => Seq.empty
9b74d0339c44 added PARALLEL_CHOICE, PARALLEL_GOALS;
wenzelm
parents: 32255
diff changeset
   429
  | SOME st' => Seq.single st');
9b74d0339c44 added PARALLEL_CHOICE, PARALLEL_GOALS;
wenzelm
parents: 32255
diff changeset
   430
9b74d0339c44 added PARALLEL_CHOICE, PARALLEL_GOALS;
wenzelm
parents: 32255
diff changeset
   431
(*parallel refinement of non-schematic goal by single results*)
32788
a65deb8f9434 PARALLEL_GOALS: proper scope for exception FAILED, with dummy argument to prevent its interpretation as variable;
wenzelm
parents: 32738
diff changeset
   432
exception FAILED of unit;
42370
244911efd275 refined PARALLEL_GOALS;
wenzelm
parents: 42360
diff changeset
   433
fun PARALLEL_GOALS tac =
244911efd275 refined PARALLEL_GOALS;
wenzelm
parents: 42360
diff changeset
   434
  Thm.adjust_maxidx_thm ~1 #>
244911efd275 refined PARALLEL_GOALS;
wenzelm
parents: 42360
diff changeset
   435
  (fn st =>
42371
5900f06b4198 enable PARALLEL_GOALS more liberally, unlike forked proofs (cf. 34b9652b2f45);
wenzelm
parents: 42370
diff changeset
   436
    if not (Multithreading.enabled ()) orelse Thm.maxidx_of st >= 0 orelse Thm.nprems_of st <= 1
42370
244911efd275 refined PARALLEL_GOALS;
wenzelm
parents: 42360
diff changeset
   437
    then DETERM tac st
244911efd275 refined PARALLEL_GOALS;
wenzelm
parents: 42360
diff changeset
   438
    else
244911efd275 refined PARALLEL_GOALS;
wenzelm
parents: 42360
diff changeset
   439
      let
244911efd275 refined PARALLEL_GOALS;
wenzelm
parents: 42360
diff changeset
   440
        fun try_tac g =
244911efd275 refined PARALLEL_GOALS;
wenzelm
parents: 42360
diff changeset
   441
          (case SINGLE tac g of
244911efd275 refined PARALLEL_GOALS;
wenzelm
parents: 42360
diff changeset
   442
            NONE => raise FAILED ()
244911efd275 refined PARALLEL_GOALS;
wenzelm
parents: 42360
diff changeset
   443
          | SOME g' => g');
32365
9b74d0339c44 added PARALLEL_CHOICE, PARALLEL_GOALS;
wenzelm
parents: 32255
diff changeset
   444
42370
244911efd275 refined PARALLEL_GOALS;
wenzelm
parents: 42360
diff changeset
   445
        val goals = Drule.strip_imp_prems (Thm.cprop_of st);
244911efd275 refined PARALLEL_GOALS;
wenzelm
parents: 42360
diff changeset
   446
        val results = Par_List.map (try_tac o init) goals;
244911efd275 refined PARALLEL_GOALS;
wenzelm
parents: 42360
diff changeset
   447
      in ALLGOALS (fn i => retrofit i 1 (nth results (i - 1))) st end
244911efd275 refined PARALLEL_GOALS;
wenzelm
parents: 42360
diff changeset
   448
      handle FAILED () => Seq.empty);
32365
9b74d0339c44 added PARALLEL_CHOICE, PARALLEL_GOALS;
wenzelm
parents: 32255
diff changeset
   449
18207
9edbeda7e39a tuned norm_hhf_protected;
wenzelm
parents: 18180
diff changeset
   450
end;
9edbeda7e39a tuned norm_hhf_protected;
wenzelm
parents: 18180
diff changeset
   451
32365
9b74d0339c44 added PARALLEL_CHOICE, PARALLEL_GOALS;
wenzelm
parents: 32255
diff changeset
   452
structure Basic_Goal: BASIC_GOAL = Goal;
9b74d0339c44 added PARALLEL_CHOICE, PARALLEL_GOALS;
wenzelm
parents: 32255
diff changeset
   453
open Basic_Goal;