src/Pure/Tools/simplifier_trace.ML
author wenzelm
Mon Jul 21 16:49:06 2014 +0200 (2014-07-21)
changeset 57592 b73d74d0e428
parent 57591 8c095aef6769
child 57594 037f3b251df5
permissions -rw-r--r--
misc tuning and simplification;
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(*  Title:      Pure/Tools/simplifier_trace.ML
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    Author:     Lars Hupel
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Interactive Simplifier trace.
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*)
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signature SIMPLIFIER_TRACE =
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sig
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  val add_term_breakpoint: term -> Context.generic -> Context.generic
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  val add_thm_breakpoint: thm -> Context.generic -> Context.generic
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end
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structure Simplifier_Trace: SIMPLIFIER_TRACE =
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struct
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(** context data **)
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datatype mode = Disabled | Normal | Full
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fun merge_modes Disabled m = m
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  | merge_modes Normal Full = Full
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  | merge_modes Normal _ = Normal
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  | merge_modes Full _ = Full
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val empty_breakpoints =
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  (Item_Net.init (op aconv) single,
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   Item_Net.init eq_rrule (single o Thm.full_prop_of o #thm))
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fun merge_breakpoints ((term_bs1, thm_bs1), (term_bs2, thm_bs2)) =
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  (Item_Net.merge (term_bs1, term_bs2),
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   Item_Net.merge (thm_bs1, thm_bs2))
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structure Data = Generic_Data
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(
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  type T =
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    {max_depth: int,
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     mode: mode,
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     interactive: bool,
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     memory: bool,
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     parent: int,
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     breakpoints: term Item_Net.T * rrule Item_Net.T}
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  val empty =
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    {max_depth = 10,
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     mode = Disabled,
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     interactive = false,
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     memory = true,
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     parent = 0,
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     breakpoints = empty_breakpoints}
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  val extend = I
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  fun merge
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    ({max_depth = max_depth1, mode = mode1, interactive = interactive1,
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      memory = memory1, breakpoints = breakpoints1, ...}: T,
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     {max_depth = max_depth2, mode = mode2, interactive = interactive2,
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      memory = memory2, breakpoints = breakpoints2, ...}: T) =
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    {max_depth = Int.max (max_depth1, max_depth2),
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     mode = merge_modes mode1 mode2,
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     interactive = interactive1 orelse interactive2,
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     memory = memory1 andalso memory2,
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     parent = 0,
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     breakpoints = merge_breakpoints (breakpoints1, breakpoints2)}: T
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)
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val get_data = Data.get o Context.Proof
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val put_data = Context.proof_map o Data.put
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val get_breakpoints = #breakpoints o get_data
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fun map_breakpoints f =
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  Data.map
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    (fn {max_depth, mode, interactive, parent, memory, breakpoints} =>
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      {max_depth = max_depth,
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       mode = mode,
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       interactive = interactive,
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       memory = memory,
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       parent = parent,
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       breakpoints = f breakpoints})
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fun add_term_breakpoint term =
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  map_breakpoints (apfst (Item_Net.update term))
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fun add_thm_breakpoint thm context =
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  let
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    val rrules = mk_rrules (Context.proof_of context) [thm]
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  in
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    map_breakpoints (apsnd (fold Item_Net.update rrules)) context
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  end
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fun check_breakpoint (term, rrule) ctxt =
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  let
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    val thy = Proof_Context.theory_of ctxt
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    val (term_bs, thm_bs) = get_breakpoints ctxt
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    val term_matches =
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      filter (fn pat => Pattern.matches thy (pat, term))
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        (Item_Net.retrieve_matching term_bs term)
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    val thm_matches =
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      exists (eq_rrule o pair rrule)
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        (Item_Net.retrieve_matching thm_bs (Thm.full_prop_of (#thm rrule)))
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  in
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    (term_matches, thm_matches)
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  end
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(** config and attributes **)
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fun config raw_mode interactive max_depth memory =
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  let
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    val mode =
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      (case raw_mode of
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        "normal" => Normal
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      | "full" => Full
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      | _ => error ("Simplifier_Trace.config: unknown mode " ^ raw_mode))
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    val update = Data.map (fn {parent, breakpoints, ...} =>
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      {max_depth = max_depth,
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       mode = mode,
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       interactive = interactive,
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       memory = memory,
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       parent = parent,
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       breakpoints = breakpoints})
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  in Thm.declaration_attribute (K update) end
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fun breakpoint terms =
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  Thm.declaration_attribute (fn thm => add_thm_breakpoint thm o fold add_term_breakpoint terms)
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(** tracing state **)
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val futures =
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  Synchronized.var "Simplifier_Trace.futures" (Inttab.empty: string future Inttab.table)
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(** markup **)
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fun output_result (id, data) =
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  Output.result (Markup.serial_properties id) [data]
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val parentN = "parent"
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val textN = "text"
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val memoryN = "memory"
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val successN = "success"
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type payload =
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  {props: Properties.T,
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   pretty: Pretty.T}
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fun empty_payload () : payload =
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  {props = [], pretty = Pretty.str ""}
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fun mk_generic_result markup text triggered (payload : unit -> payload) ctxt =
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  let
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    val {mode, interactive, memory, parent, ...} = get_data ctxt
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    val eligible =
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      (case mode of
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        Disabled => false
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      | Normal => triggered
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      | Full => true)
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    val markup' =
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      if markup = Markup.simp_trace_stepN andalso not interactive
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      then Markup.simp_trace_logN
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      else markup
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  in
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    if not eligible then NONE
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    else
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      let
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        val {props = more_props, pretty} = payload ()
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        val props =
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          [(textN, text),
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           (memoryN, Markup.print_bool memory),
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           (parentN, Markup.print_int parent)]
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        val data =
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          Pretty.string_of (Pretty.markup (markup', props @ more_props) [pretty])
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      in
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        SOME (serial (), data)
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      end
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  end
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(** tracing output **)
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fun send_request (result_id, content) =
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  let
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    fun break () =
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      (Output.protocol_message (Markup.simp_trace_cancel result_id) [];
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       Synchronized.change futures (Inttab.delete_safe result_id))
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    val promise = Future.promise break : string future
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  in
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    Synchronized.change futures (Inttab.update_new (result_id, promise));
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    output_result (result_id, content);
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    promise
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  end
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type data = {term: term, thm: thm, unconditional: bool, ctxt: Proof.context, rrule: rrule}
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fun step ({term, thm, unconditional, ctxt, rrule}: data) =
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  let
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    val (matching_terms, thm_triggered) = check_breakpoint (term, rrule) ctxt
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    val {name, ...} = rrule
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    val term_triggered = not (null matching_terms)
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    val text =
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      if unconditional then "Apply rewrite rule?"
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      else "Apply conditional rewrite rule?"
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    fun payload () =
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      let
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        (* FIXME pretty printing via Proof_Context.pretty_fact *)
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        val pretty_thm = Pretty.block
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          [Pretty.str ("Instance of " ^ name ^ ":"),
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           Pretty.brk 1,
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           Syntax.pretty_term ctxt (Thm.prop_of thm)]
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        val pretty_term = Pretty.block
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          [Pretty.str "Trying to rewrite:",
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           Pretty.brk 1,
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           Syntax.pretty_term ctxt term]
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        val pretty_matchings =
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          let
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            val items = map (Pretty.item o single o Syntax.pretty_term ctxt) matching_terms
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          in
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            if not (null matching_terms) then
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              [Pretty.block (Pretty.fbreaks (Pretty.str "Matching terms:" :: items))]
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            else []
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          end
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        val pretty =
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          Pretty.chunks ([pretty_thm, pretty_term] @ pretty_matchings)
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      in
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        {props = [], pretty = pretty}
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      end
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    val {max_depth, mode, interactive, memory, breakpoints, ...} = get_data ctxt
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    fun mk_promise result =
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      let
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        val result_id = #1 result
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        fun put mode' interactive' = put_data
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          {max_depth = max_depth,
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           mode = mode',
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           interactive = interactive',
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           memory = memory,
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           parent = result_id,
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           breakpoints = breakpoints} ctxt
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        fun to_response "skip" = NONE
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          | to_response "continue" = SOME (put mode true)
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          | to_response "continue_trace" = SOME (put Full true)
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          | to_response "continue_passive" = SOME (put mode false)
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          | to_response "continue_disable" = SOME (put Disabled false)
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          | to_response _ = raise Fail "Simplifier_Trace.step: invalid message"
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      in
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        if not interactive then
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          (output_result result; Future.value (SOME (put mode false)))
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        else Future.map to_response (send_request result)
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      end
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  in
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    (case mk_generic_result Markup.simp_trace_stepN text
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        (thm_triggered orelse term_triggered) payload ctxt of
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      NONE => Future.value (SOME ctxt)
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    | SOME res => mk_promise res)
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  end
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fun recurse text depth term ctxt =
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  let
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    fun payload () =
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      {props = [],
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       pretty = Syntax.pretty_term ctxt term}
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    val {max_depth, mode, interactive, memory, breakpoints, ...} = get_data ctxt
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    fun put result_id = put_data
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      {max_depth = max_depth,
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       mode = if depth >= max_depth then Disabled else mode,
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       interactive = interactive,
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       memory = memory,
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       parent = result_id,
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       breakpoints = breakpoints} ctxt
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  in
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    (case mk_generic_result Markup.simp_trace_recurseN text true payload ctxt of
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      NONE => put 0
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    | SOME res => (output_result res; put (#1 res)))
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  end
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fun indicate_failure ({term, ctxt, thm, rrule, ...}: data) ctxt' =
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  let
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    fun payload () =
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      let
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        val {name, ...} = rrule
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        val pretty_thm =
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          (* FIXME pretty printing via Proof_Context.pretty_fact *)
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          Pretty.block
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            [Pretty.str ("In an instance of " ^ name ^ ":"),
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             Pretty.brk 1,
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             Syntax.pretty_term ctxt (Thm.prop_of thm)]
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        val pretty_term =
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          Pretty.block
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            [Pretty.str "Was trying to rewrite:",
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             Pretty.brk 1,
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             Syntax.pretty_term ctxt term]
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        val pretty =
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          Pretty.chunks [pretty_thm, pretty_term]
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      in
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        {props = [(successN, "false")], pretty = pretty}
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      end
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    val {interactive, ...} = get_data ctxt
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    fun mk_promise result =
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      let
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        fun to_response "exit" = false
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          | to_response "redo" =
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              (Option.app output_result
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                (mk_generic_result Markup.simp_trace_ignoreN "Ignore" true empty_payload ctxt');
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               true)
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          | to_response _ = raise Fail "Simplifier_Trace.indicate_failure: invalid message"
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      in
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        if not interactive then
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          (output_result result; Future.value false)
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        else Future.map to_response (send_request result)
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      end
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  in
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    (case mk_generic_result Markup.simp_trace_hintN "Step failed" true payload ctxt' of
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      NONE => Future.value false
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    | SOME res => mk_promise res)
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  end
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fun indicate_success thm ctxt =
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  let
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    fun payload () =
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      {props = [(successN, "true")],
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       pretty = Syntax.pretty_term ctxt (Thm.prop_of thm)}
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  in
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    Option.app output_result
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      (mk_generic_result Markup.simp_trace_hintN "Successfully rewrote" true payload ctxt)
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  end
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(** setup **)
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fun simp_apply args ctxt cont =
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  let
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    val {unconditional: bool, term: term, thm: thm, rrule: rrule} = args
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    val data =
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      {term = term,
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       unconditional = unconditional,
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       ctxt = ctxt,
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       thm = thm,
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       rrule = rrule}
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  in
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    (case Future.join (step data) of
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      NONE => NONE
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    | SOME ctxt' =>
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        let val res = cont ctxt' in
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          (case res of
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            NONE =>
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              if Future.join (indicate_failure data ctxt') then
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                simp_apply args ctxt cont
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              else NONE
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          | SOME (thm, _) => (indicate_success thm ctxt'; res))
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        end)
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  end
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val _ = Session.protocol_handler "isabelle.Simplifier_Trace$Handler"
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val _ = Theory.setup
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  (Simplifier.set_trace_ops
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    {trace_invoke = fn {depth, term} => recurse "Simplifier invoked" depth term,
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     trace_apply = simp_apply})
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val _ =
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  Isabelle_Process.protocol_command "Simplifier_Trace.reply"
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    (fn [s, r] =>
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      let
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        val serial = Markup.parse_int s
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        fun lookup_delete tab =
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          (Inttab.lookup tab serial, Inttab.delete_safe serial tab)
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        fun apply_result (SOME promise) = Future.fulfill promise r
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          | apply_result NONE = () (* FIXME handle protocol failure, just like in active.ML? *)
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      in
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        (Synchronized.change_result futures lookup_delete |> apply_result)
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          handle exn => if Exn.is_interrupt exn then () (*sic!*) else reraise exn
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      end)
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(** attributes **)
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val mode_parser =
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  Scan.optional
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    (Args.$$$ "mode" |-- Args.$$$ "=" |-- (Args.$$$ "normal" || Args.$$$ "full"))
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    "normal"
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val interactive_parser =
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  Scan.optional (Args.$$$ "interactive" >> K true) false
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val memory_parser =
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  Scan.optional (Args.$$$ "no_memory" >> K false) true
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val depth_parser =
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  Scan.optional (Args.$$$ "depth" |-- Args.$$$ "=" |-- Parse.nat) 10
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val config_parser =
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  (interactive_parser -- mode_parser -- depth_parser -- memory_parser) >>
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    (fn (((interactive, mode), depth), memory) => config mode interactive depth memory)
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val _ = Theory.setup
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  (Attrib.setup @{binding simp_break}
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    (Scan.repeat Args.term_pattern >> breakpoint)
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    "declaration of a simplifier breakpoint" #>
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   Attrib.setup @{binding simp_trace_new} (Scan.lift config_parser)
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    "simplifier trace configuration")
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end