src/Pure/PIDE/command.ML
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clarified memo_exec: plain synchronized access without any special tricks;
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(*  Title:      Pure/PIDE/command.ML
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    Author:     Makarius
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Prover command execution: read -- eval -- print.
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*)
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signature COMMAND =
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sig
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  val read: (unit -> theory) -> Token.T list -> Toplevel.transition
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  type eval
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  val eval_eq: eval * eval -> bool
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  val eval_result_state: eval -> Toplevel.state
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  val eval_stable: eval -> bool
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  val eval: (unit -> theory) -> Token.T list -> eval -> eval
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  type print
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  val print: bool -> string -> eval -> print list -> print list option
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  type print_fn = Toplevel.transition -> Toplevel.state -> unit
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  val print_function: {name: string, pri: int, persistent: bool} ->
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    ({command_name: string} -> print_fn option) -> unit
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  val no_print_function: string -> unit
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  type exec = eval * print list
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  val no_exec: exec
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  val exec_ids: exec option -> Document_ID.exec list
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  val exec: Document_ID.execution -> exec -> unit
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end;
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structure Command: COMMAND =
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struct
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(** memo results -- including physical interrupts! **)
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datatype 'a expr =
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  Expr of Document_ID.exec * (unit -> 'a) |
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  Result of 'a Exn.result;
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abstype 'a memo = Memo of 'a expr Synchronized.var
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with
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fun memo exec_id e = Memo (Synchronized.var "Command.memo" (Expr (exec_id, e)));
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fun memo_value a = Memo (Synchronized.var "Command.memo" (Result (Exn.Res a)));
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fun memo_result (Memo v) =
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  (case Synchronized.value v of
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    Expr (exec_id, _) => error ("Unfinished execution result: " ^ Document_ID.print exec_id)
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  | Result res => Exn.release res);
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fun memo_stable (Memo v) =
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  (case Synchronized.value v of
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   Expr _ => true
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 | Result res => not (Exn.is_interrupt_exn res));
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fun memo_exec execution_id (Memo v) =
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  Synchronized.guarded_access v
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    (fn expr =>
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      (case expr of
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        Result res => SOME (res, expr)
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      | Expr (exec_id, e) =>
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          uninterruptible (fn restore_attributes => fn () =>
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            if Execution.running execution_id exec_id then
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              let
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                val res = Exn.capture (restore_attributes e) ();
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                val _ = Execution.finished exec_id;
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              in SOME (res, Result res) end
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            else SOME (Exn.interrupt_exn, expr)) ()))
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  |> Exn.release |> ignore;
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fun memo_fork params execution_id (Memo v) =
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  (case Synchronized.value v of
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    Result _ => ()
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  | _ => ignore ((singleton o Future.forks) params (fn () => memo_exec execution_id (Memo v))));
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end;
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(** main phases of execution **)
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(* read *)
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fun read init span =
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  let
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    val outer_syntax = #2 (Outer_Syntax.get_syntax ());
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    val command_reports = Outer_Syntax.command_reports outer_syntax;
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    val proper_range =
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      Position.set_range (Token.position_range_of (#1 (take_suffix Token.is_improper span)));
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    val pos =
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      (case find_first Token.is_command span of
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        SOME tok => Token.position_of tok
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      | NONE => proper_range);
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    val (is_malformed, token_reports) = Thy_Syntax.reports_of_tokens span;
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    val _ = Position.reports_text (token_reports @ maps command_reports span);
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  in
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    if is_malformed then Toplevel.malformed pos "Malformed command syntax"
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    else
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      (case Outer_Syntax.read_spans outer_syntax span of
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        [tr] =>
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          if Keyword.is_control (Toplevel.name_of tr) then
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            Toplevel.malformed pos "Illegal control command"
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          else Toplevel.modify_init init tr
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      | [] => Toplevel.ignored (Position.set_range (Token.position_range_of span))
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      | _ => Toplevel.malformed proper_range "Exactly one command expected")
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      handle ERROR msg => Toplevel.malformed proper_range msg
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  end;
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(* eval *)
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type eval_state =
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  {failed: bool, malformed: bool, command: Toplevel.transition, state: Toplevel.state};
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val init_eval_state =
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  {failed = false, malformed = false, command = Toplevel.empty, state = Toplevel.toplevel};
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datatype eval = Eval of {exec_id: Document_ID.exec, eval_process: eval_state memo};
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fun eval_eq (Eval {exec_id, ...}, Eval {exec_id = exec_id', ...}) = exec_id = exec_id';
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fun eval_result (Eval {eval_process, ...}) = memo_result eval_process;
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val eval_result_state = #state o eval_result;
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fun eval_stable (Eval {exec_id, eval_process}) =
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  Goal.stable_futures exec_id andalso memo_stable eval_process;
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local
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fun run int tr st =
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  if Goal.future_enabled () andalso Keyword.is_diag (Toplevel.name_of tr) then
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    (Goal.fork_params {name = "Toplevel.diag", pos = Toplevel.pos_of tr, pri = ~1}
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      (fn () => Toplevel.command_exception int tr st); ([], SOME st))
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  else Toplevel.command_errors int tr st;
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fun check_cmts span tr st' =
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  Toplevel.setmp_thread_position tr
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    (fn () =>
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      Outer_Syntax.side_comments span |> maps (fn cmt =>
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        (Thy_Output.check_text (Token.source_position_of cmt) st'; [])
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          handle exn => ML_Compiler.exn_messages_ids exn)) ();
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fun proof_status tr st =
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  (case try Toplevel.proof_of st of
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    SOME prf => Toplevel.status tr (Proof.status_markup prf)
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  | NONE => ());
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fun eval_state span tr ({malformed, state = st, ...}: eval_state) =
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  if malformed then
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    {failed = true, malformed = malformed, command = tr, state = Toplevel.toplevel}
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  else
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    let
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      val malformed' = Toplevel.is_malformed tr;
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      val is_init = Toplevel.is_init tr;
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      val is_proof = Keyword.is_proof (Toplevel.name_of tr);
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      val _ = Multithreading.interrupted ();
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      val _ = Toplevel.status tr Markup.running;
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      val (errs1, result) = run (is_init orelse is_proof) (Toplevel.set_print false tr) st;
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      val errs2 = (case result of NONE => [] | SOME st' => check_cmts span tr st');
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      val errs = errs1 @ errs2;
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      val _ = Toplevel.status tr Markup.finished;
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      val _ = List.app (Future.error_msg (Toplevel.pos_of tr)) errs;
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    in
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      (case result of
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        NONE =>
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          let
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            val _ = if null errs then Exn.interrupt () else ();
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            val _ = Toplevel.status tr Markup.failed;
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          in {failed = true, malformed = malformed', command = tr, state = st} end
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      | SOME st' =>
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          let
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            val _ = proof_status tr st';
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          in {failed = false, malformed = malformed', command = tr, state = st'} end)
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    end;
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in
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fun eval init span eval0 =
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  let
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    val exec_id = Document_ID.make ();
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    fun process () =
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      let
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        val tr =
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          Position.setmp_thread_data (Position.id_only (Document_ID.print exec_id))
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            (fn () => read init span |> Toplevel.exec_id exec_id) ();
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      in eval_state span tr (eval_result eval0) end;
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  in Eval {exec_id = exec_id, eval_process = memo exec_id process} end;
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end;
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(* print *)
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datatype print = Print of
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 {name: string, pri: int, persistent: bool,
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  exec_id: Document_ID.exec, print_process: unit memo};
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type print_fn = Toplevel.transition -> Toplevel.state -> unit;
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local
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type print_function = string * (int * bool * ({command_name: string} -> print_fn option));
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val print_functions = Synchronized.var "Command.print_functions" ([]: print_function list);
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fun print_error tr e =
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  (Toplevel.setmp_thread_position tr o Runtime.controlled_execution) e () handle exn =>
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    List.app (Future.error_msg (Toplevel.pos_of tr)) (ML_Compiler.exn_messages_ids exn);
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fun print_eq (Print {exec_id, ...}, Print {exec_id = exec_id', ...}) = exec_id = exec_id';
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fun print_stable (Print {exec_id, print_process, ...}) =
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  Goal.stable_futures exec_id andalso memo_stable print_process;
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fun print_persistent (Print {persistent, ...}) = persistent;
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in
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fun print command_visible command_name eval old_prints =
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  let
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    fun new_print (name, (pri, persistent, get_fn)) =
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      let
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        fun make_print strict print_fn =
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          let
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            val exec_id = Document_ID.make ();
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            fun process () =
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              let
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                val {failed, command, state = st', ...} = eval_result eval;
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                val tr = Toplevel.exec_id exec_id command;
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              in
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                if failed andalso not strict then ()
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                else print_error tr (fn () => print_fn tr st')
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              end;
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          in
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           Print {
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             name = name, pri = pri, persistent = persistent,
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             exec_id = exec_id, print_process = memo exec_id process}
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          end;
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      in
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        (case Exn.capture (Runtime.controlled_execution get_fn) {command_name = command_name} of
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          Exn.Res NONE => NONE
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        | Exn.Res (SOME print_fn) => SOME (make_print false print_fn)
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        | Exn.Exn exn => SOME (make_print true (fn _ => fn _ => reraise exn)))
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      end;
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    val new_prints =
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      if command_visible then
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        rev (Synchronized.value print_functions) |> map_filter (fn pr =>
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          (case find_first (fn Print {name, ...} => name = fst pr) old_prints of
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            SOME print => if print_stable print then SOME print else new_print pr
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          | NONE => new_print pr))
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      else filter (fn print => print_persistent print andalso print_stable print) old_prints;
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  in
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    if eq_list print_eq (old_prints, new_prints) then NONE else SOME new_prints
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  end;
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fun print_function {name, pri, persistent} f =
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  Synchronized.change print_functions (fn funs =>
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   (if not (AList.defined (op =) funs name) then ()
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    else warning ("Redefining command print function: " ^ quote name);
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    AList.update (op =) (name, (pri, persistent, f)) funs));
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fun no_print_function name =
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  Synchronized.change print_functions (filter_out (equal name o #1));
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end;
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val _ =
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  print_function {name = "print_state", pri = 0, persistent = true}
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    (fn {command_name} => SOME (fn tr => fn st' =>
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      let
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        val is_init = Keyword.is_theory_begin command_name;
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        val is_proof = Keyword.is_proof command_name;
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        val do_print =
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          not is_init andalso
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            (Toplevel.print_of tr orelse (is_proof andalso Toplevel.is_proof st'));
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      in if do_print then Toplevel.print_state false st' else () end));
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(* combined execution *)
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type exec = eval * print list;
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val no_exec: exec =
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  (Eval {exec_id = Document_ID.none, eval_process = memo_value init_eval_state}, []);
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fun exec_ids NONE = []
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  | exec_ids (SOME (Eval {exec_id, ...}, prints)) =
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      exec_id :: map (fn Print {exec_id, ...} => exec_id) prints;
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local
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fun run_print execution_id (Print {name, pri, print_process, ...}) =
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  (if Multithreading.enabled () then
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    memo_fork {name = name, group = NONE, deps = [], pri = pri, interrupts = true}
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  else memo_exec) execution_id print_process;
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in
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fun exec execution_id (Eval {eval_process, ...}, prints) =
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  (memo_exec execution_id eval_process; List.app (run_print execution_id) prints);
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end;
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end;
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