author | blanchet |
Thu, 12 May 2011 15:29:19 +0200 | |
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parent 42650 | 552eae49f97d |
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permissions | -rw-r--r-- |
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(* Title: HOL/Tools/Metis/metis_tactics.ML |
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Author: Kong W. Susanto, Cambridge University Computer Laboratory |
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Author: Lawrence C. Paulson, Cambridge University Computer Laboratory |
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Author: Jasmin Blanchette, TU Muenchen |
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The Metis prover (slightly modified version from Larry);
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Copyright Cambridge University 2007 |
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HOL setup for the Metis prover. |
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*) |
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signature METIS_TACTICS = |
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sig |
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val trace : bool Config.T |
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val verbose : bool Config.T |
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val type_lits : bool Config.T |
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val new_skolemizer : bool Config.T |
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val metis_tac : Proof.context -> thm list -> int -> tactic |
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val metisF_tac : Proof.context -> thm list -> int -> tactic |
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val metisFT_tac : Proof.context -> thm list -> int -> tactic |
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val setup : theory -> theory |
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end |
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structure Metis_Tactics : METIS_TACTICS = |
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struct |
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open Metis_Translate |
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open Metis_Reconstruct |
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val type_lits = Attrib.setup_config_bool @{binding metis_type_lits} (K true) |
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val new_skolemizer = Attrib.setup_config_bool @{binding metis_new_skolemizer} (K false) |
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fun is_false t = t aconv (HOLogic.mk_Trueprop HOLogic.false_const); |
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fun have_common_thm ths1 ths2 = |
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exists (member Thm.eq_thm ths1) (map Meson.make_meta_clause ths2) |
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(*Determining which axiom clauses are actually used*) |
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fun used_axioms axioms (th, Metis_Proof.Axiom _) = SOME (lookth axioms th) |
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| used_axioms _ _ = NONE; |
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val clause_params = |
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{ordering = Metis_KnuthBendixOrder.default, |
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orderLiterals = Metis_Clause.UnsignedLiteralOrder, |
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orderTerms = true} |
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val active_params = |
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{clause = clause_params, |
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prefactor = #prefactor Metis_Active.default, |
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postfactor = #postfactor Metis_Active.default} |
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val waiting_params = |
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{symbolsWeight = 1.0, |
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variablesWeight = 0.0, |
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literalsWeight = 0.0, |
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models = []} |
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val resolution_params = {active = active_params, waiting = waiting_params} |
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(* Main function to start Metis proof and reconstruction *) |
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fun FOL_SOLVE mode ctxt cls ths0 = |
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let val thy = Proof_Context.theory_of ctxt |
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val type_lits = Config.get ctxt type_lits |
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val new_skolemizer = |
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Config.get ctxt new_skolemizer orelse null (Meson.choice_theorems thy) |
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val th_cls_pairs = |
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map2 (fn j => fn th => |
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(Thm.get_name_hint th, |
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Meson_Clausify.cnf_axiom ctxt new_skolemizer j th)) |
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(0 upto length ths0 - 1) ths0 |
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val thss = map (snd o snd) th_cls_pairs |
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val dischargers = map (fst o snd) th_cls_pairs |
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val _ = trace_msg ctxt (fn () => "FOL_SOLVE: CONJECTURE CLAUSES") |
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val _ = app (fn th => trace_msg ctxt (fn () => Display.string_of_thm ctxt th)) cls |
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val _ = trace_msg ctxt (fn () => "THEOREM CLAUSES") |
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val _ = app (app (fn th => trace_msg ctxt (fn () => Display.string_of_thm ctxt th))) thss |
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val (mode, {axioms, tfrees, old_skolems}) = |
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prepare_metis_problem mode ctxt type_lits cls thss |
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val _ = if null tfrees then () |
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else (trace_msg ctxt (fn () => "TFREE CLAUSES"); |
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app (fn TyLitFree ((s, _), (s', _)) => |
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trace_msg ctxt (fn () => s ^ "(" ^ s' ^ ")")) tfrees) |
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val _ = trace_msg ctxt (fn () => "CLAUSES GIVEN TO METIS") |
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val thms = map #1 axioms |
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val _ = app (fn th => trace_msg ctxt (fn () => Metis_Thm.toString th)) thms |
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val _ = trace_msg ctxt (fn () => "mode = " ^ string_of_mode mode) |
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val _ = trace_msg ctxt (fn () => "START METIS PROVE PROCESS") |
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in |
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case filter (is_false o prop_of) cls of |
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false_th::_ => [false_th RS @{thm FalseE}] |
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| [] => |
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case Metis_Resolution.new resolution_params {axioms = thms, conjecture = []} |
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|> Metis_Resolution.loop of |
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Metis_Resolution.Contradiction mth => |
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let val _ = trace_msg ctxt (fn () => "METIS RECONSTRUCTION START: " ^ |
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Metis_Thm.toString mth) |
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val ctxt' = fold Variable.declare_constraints (map prop_of cls) ctxt |
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(*add constraints arising from converting goal to clause form*) |
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val proof = Metis_Proof.proof mth |
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val result = fold (replay_one_inference ctxt' mode old_skolems) |
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proof axioms |
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and used = map_filter (used_axioms axioms) proof |
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val _ = trace_msg ctxt (fn () => "METIS COMPLETED...clauses actually used:") |
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val _ = app (fn th => trace_msg ctxt (fn () => Display.string_of_thm ctxt th)) used |
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val unused = th_cls_pairs |> map_filter (fn (name, (_, cls)) => |
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if have_common_thm used cls then NONE else SOME name) |
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in |
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if not (null cls) andalso not (have_common_thm used cls) then |
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verbose_warning ctxt "The assumptions are inconsistent" |
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else |
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(); |
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if not (null unused) then |
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verbose_warning ctxt ("Unused theorems: " ^ commas_quote unused) |
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else |
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(); |
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case result of |
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(_,ith)::_ => |
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(trace_msg ctxt (fn () => "Success: " ^ Display.string_of_thm ctxt ith); |
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[discharge_skolem_premises ctxt dischargers ith]) |
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| _ => (trace_msg ctxt (fn () => "Metis: No result"); []) |
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end |
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| Metis_Resolution.Satisfiable _ => |
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(trace_msg ctxt (fn () => "Metis: No first-order proof with the lemmas supplied"); |
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if mode <> FT then |
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raise METIS ("FOL_SOLVE", |
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"No first-order proof with the lemmas supplied") |
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else |
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(); |
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[]) |
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end |
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handle METIS (loc, msg) => |
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if mode <> FT then |
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(verbose_warning ctxt ("Falling back on \"metisFT\"."); |
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FOL_SOLVE FT ctxt cls ths0) |
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else |
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error ("Failed to replay Metis proof in Isabelle." ^ |
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(if Config.get ctxt verbose then "\n" ^ loc ^ ": " ^ msg |
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else "")) |
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(* Extensionalize "th", because that makes sense and that's what Sledgehammer |
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does, but also keep an unextensionalized version of "th" for backward |
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compatibility. *) |
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fun also_extensionalize_theorem th = |
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let val th' = Meson_Clausify.extensionalize_theorem th in |
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if Thm.eq_thm (th, th') then [th] |
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else th :: Meson.make_clauses_unsorted [th'] |
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end |
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143 |
|
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val neg_clausify = |
145 |
single |
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#> Meson.make_clauses_unsorted |
|
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#> maps also_extensionalize_theorem |
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#> map Meson_Clausify.introduce_combinators_in_theorem |
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#> Meson.finish_cnf |
150 |
||
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fun preskolem_tac ctxt st0 = |
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(if exists (Meson.has_too_many_clauses ctxt) |
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(Logic.prems_of_goal (prop_of st0) 1) then |
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Simplifier.full_simp_tac (Meson_Clausify.ss_only @{thms not_all not_ex}) 1 |
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THEN cnf.cnfx_rewrite_tac ctxt 1 |
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else |
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all_tac) st0 |
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|
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val type_has_top_sort = |
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exists_subtype (fn TFree (_, []) => true | TVar (_, []) => true | _ => false) |
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|
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fun generic_metis_tac mode ctxt ths i st0 = |
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let |
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val _ = trace_msg ctxt (fn () => |
32956 | 165 |
"Metis called with theorems " ^ cat_lines (map (Display.string_of_thm ctxt) ths)) |
166 |
in |
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if exists_type type_has_top_sort (prop_of st0) then |
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(verbose_warning ctxt "Proof state contains the universal sort {}"; |
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Seq.empty) |
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else |
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Meson.MESON (preskolem_tac ctxt) (maps neg_clausify) |
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(fn cls => resolve_tac (FOL_SOLVE mode ctxt cls ths) 1) |
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ctxt i st0 |
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end |
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|
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val metis_tac = generic_metis_tac HO |
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val metisF_tac = generic_metis_tac FO |
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val metisFT_tac = generic_metis_tac FT |
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|
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(* Whenever "X" has schematic type variables, we treat "using X by metis" as |
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181 |
"by (metis X)", to prevent "Subgoal.FOCUS" from freezing the type variables. |
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182 |
We don't do it for nonschematic facts "X" because this breaks a few proofs |
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183 |
(in the rare and subtle case where a proof relied on extensionality not being |
38994 | 184 |
applied) and brings few benefits. *) |
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185 |
val has_tvar = |
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186 |
exists_type (exists_subtype (fn TVar _ => true | _ => false)) o prop_of |
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187 |
fun method name mode = |
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188 |
Method.setup name (Attrib.thms >> (fn ths => fn ctxt => |
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189 |
METHOD (fn facts => |
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190 |
let |
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191 |
val (schem_facts, nonschem_facts) = |
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192 |
List.partition has_tvar facts |
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193 |
in |
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194 |
HEADGOAL (Method.insert_tac nonschem_facts THEN' |
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195 |
CHANGED_PROP |
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196 |
o generic_metis_tac mode ctxt (schem_facts @ ths)) |
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197 |
end))) |
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|
32956 | 199 |
val setup = |
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200 |
method @{binding metis} HO "Metis for FOL/HOL problems" |
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201 |
#> method @{binding metisF} FO "Metis for FOL problems" |
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202 |
#> method @{binding metisFT} FT |
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203 |
"Metis for FOL/HOL problems with fully-typed translation" |
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204 |
|
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|
205 |
end; |