2 Authors: Klaus Aehlig, LMU Muenchen; Tobias Nipkow, Florian Haftmann, TU Muenchen
4 Normalization by evaluation, based on generic code generator.
9 val dynamic_eval_conv: conv
10 val dynamic_eval_value: theory -> term -> term
11 val static_eval_conv: theory -> string list -> conv
14 Const of int * Univ list (*named (uninterpreted) constants*)
15 | DFree of string * int (*free (uninterpreted) dictionary parameters*)
16 | BVar of int * Univ list
17 | Abs of (int * (Univ list -> Univ)) * Univ list
18 val apps: Univ -> Univ list -> Univ (*explicit applications*)
19 val abss: int -> (Univ list -> Univ) -> Univ
20 (*abstractions as closures*)
21 val eq_Univ: Univ * Univ -> bool
23 val put_result: (unit -> Univ list -> Univ list) -> Proof.context -> Proof.context
24 val trace: bool Unsynchronized.ref
26 val setup: theory -> theory
27 val add_const_alias: thm -> theory -> theory
33 (* generic non-sense *)
35 val trace = Unsynchronized.ref false;
36 fun traced f x = if !trace then (tracing (f x); x) else x;
39 (** certificates and oracle for "trivial type classes" **)
41 structure Triv_Class_Data = Theory_Data
43 type T = (class * thm) list;
46 fun merge data : T = AList.merge (op =) (K true) data;
49 fun add_const_alias thm thy =
51 val (ofclass, eqn) = case try Logic.dest_equals (Thm.prop_of thm)
52 of SOME ofclass_eq => ofclass_eq
53 | _ => error ("Bad certificate: " ^ Display.string_of_thm_global thy thm);
54 val (T, class) = case try Logic.dest_of_class ofclass
55 of SOME T_class => T_class
56 | _ => error ("Bad certificate: " ^ Display.string_of_thm_global thy thm);
57 val tvar = case try Term.dest_TVar T
58 of SOME (tvar as (_, sort)) => if null (filter (can (AxClass.get_info thy)) sort)
60 else error ("Bad sort: " ^ Display.string_of_thm_global thy thm)
61 | _ => error ("Bad type: " ^ Display.string_of_thm_global thy thm);
62 val _ = if Term.add_tvars eqn [] = [tvar] then ()
63 else error ("Inconsistent type: " ^ Display.string_of_thm_global thy thm);
64 val lhs_rhs = case try Logic.dest_equals eqn
65 of SOME lhs_rhs => lhs_rhs
66 | _ => error ("Not an equation: " ^ Syntax.string_of_term_global thy eqn);
67 val c_c' = case try (pairself (AxClass.unoverload_const thy o dest_Const)) lhs_rhs
69 | _ => error ("Not an equation with two constants: "
70 ^ Syntax.string_of_term_global thy eqn);
71 val _ = if the_list (AxClass.class_of_param thy (snd c_c')) = [class] then ()
72 else error ("Inconsistent class: " ^ Display.string_of_thm_global thy thm);
73 in Triv_Class_Data.map (AList.update (op =) (class, thm)) thy end;
77 val get_triv_classes = map fst o Triv_Class_Data.get;
79 val (_, triv_of_class) = Context.>>> (Context.map_theory_result
80 (Thm.add_oracle (Binding.name "triv_of_class", fn (thy, T, class) =>
81 Thm.cterm_of thy (Logic.mk_of_class (T, class)))));
85 fun lift_triv_classes_conv thy conv ct =
87 val algebra = Sign.classes_of thy;
88 val certT = Thm.ctyp_of thy;
89 val triv_classes = get_triv_classes thy;
90 fun additional_classes sort = filter_out (fn class => Sorts.sort_le algebra (sort, [class])) triv_classes;
91 fun mk_entry (v, sort) =
93 val T = TFree (v, sort);
95 val triv_sort = additional_classes sort;
97 (v, (Sorts.inter_sort algebra (sort, triv_sort),
98 (cT, AList.make (fn class => Thm.of_class (cT, class)) sort
99 @ AList.make (fn class => triv_of_class (thy, T, class)) triv_sort)))
101 val vs_tab = map mk_entry (Term.add_tfrees (Thm.term_of ct) []);
102 fun instantiate thm =
104 val cert_tvars = map (certT o TVar) (Term.add_tvars
105 ((fst o Logic.dest_equals o Logic.strip_imp_concl o Thm.prop_of) thm) []);
107 map2 (fn cert_tvar => fn (_, (_, (cT, _))) => (cert_tvar, cT)) cert_tvars vs_tab;
108 in Thm.instantiate (instantiation, []) thm end;
109 fun of_class (TFree (v, _), class) =
110 the (AList.lookup (op =) ((snd o snd o the o AList.lookup (op =) vs_tab) v) class)
111 | of_class (T, _) = error ("Bad type " ^ Syntax.string_of_typ_global thy T);
112 fun strip_of_class thm =
114 val prems_of_class = Thm.prop_of thm
115 |> Logic.strip_imp_prems
116 |> map (Logic.dest_of_class #> of_class);
117 in fold Thm.elim_implies prems_of_class thm end;
120 |> (Drule.cterm_fun o map_types o map_type_tfree)
121 (fn (v, sort) => TFree (v, (fst o the o AList.lookup (op =) vs_tab) v))
124 |> Thm.varifyT_global
130 fun lift_triv_classes_rew thy rew t =
132 val algebra = Sign.classes_of thy;
133 val triv_classes = get_triv_classes thy;
134 val vs = Term.add_tfrees t [];
136 |> (map_types o map_type_tfree)
137 (fn (v, sort) => TFree (v, Sorts.inter_sort algebra (sort, triv_classes)))
139 |> (map_types o map_type_tfree)
140 (fn (v, _) => TFree (v, the (AList.lookup (op =) vs v)))
146 (** the semantic universe **)
149 Functions are given by their semantical function value. To avoid
150 trouble with the ML-type system, these functions have the most
151 generic type, that is "Univ list -> Univ". The calling convention is
152 that the arguments come as a list, the last argument first. In
153 other words, a function call that usually would look like
155 f x_1 x_2 ... x_n or f(x_1,x_2, ..., x_n)
157 would be in our convention called as
161 Moreover, to handle functions that are still waiting for some
162 arguments we have additionally a list of arguments collected to far
163 and the number of arguments we're still waiting for.
167 Const of int * Univ list (*named (uninterpreted) constants*)
168 | DFree of string * int (*free (uninterpreted) dictionary parameters*)
169 | BVar of int * Univ list (*bound variables, named*)
170 | Abs of (int * (Univ list -> Univ)) * Univ list
171 (*abstractions as closures*);
174 (* constructor functions *)
176 fun abss n f = Abs ((n, f), []);
177 fun apps (Abs ((n, f), xs)) ys = let val k = n - length ys in
179 of EQUAL => f (ys @ xs)
180 | LESS => let val (zs, ws) = chop (~ k) ys in apps (f (ws @ xs)) zs end
181 | GREATER => Abs ((k, f), ys @ xs) (*note: reverse convention also for apps!*)
183 | apps (Const (name, xs)) ys = Const (name, ys @ xs)
184 | apps (BVar (n, xs)) ys = BVar (n, ys @ xs);
186 fun satisfy_abs (abs as ((n, f), xs)) some_k =
189 of NONE => replicate n (BVar (0, []))
190 | SOME k => map_range (fn l => BVar (k + l, [])) n;
191 in (apps (Abs abs) ys, ys) end;
193 fun maxidx (Const (_, xs)) = fold maxidx xs
194 | maxidx (DFree _) = I
195 | maxidx (BVar (l, xs)) = fold maxidx xs #> Integer.max (l + 1)
196 | maxidx (Abs abs) = maxidx (fst (satisfy_abs abs NONE));
198 fun eq_Univ (Const (k, xs), Const (l, ys)) = k = l andalso eq_list eq_Univ (xs, ys)
199 | eq_Univ (DFree (s, k), DFree (t, l)) = s = t andalso k = l
200 | eq_Univ (BVar (k, xs), BVar (l, ys)) = k = l andalso eq_list eq_Univ (xs, ys)
201 | eq_Univ (x as Abs abs, y) =
203 val (x, ys) = satisfy_abs abs ((SOME o maxidx x o maxidx y) 0)
204 in eq_Univ (x, apps y ys) end
205 | eq_Univ (x, y as Abs _) = eq_Univ (y, x)
209 (** assembling and compiling ML code from terms **)
211 (* abstract ML syntax *)
214 fun e1 `$` e2 = "(" ^ e1 ^ " " ^ e2 ^ ")";
216 | e `$$` es = "(" ^ e ^ " " ^ space_implode " " es ^ ")";
217 fun ml_abs v e = "(fn " ^ v ^ " => " ^ e ^ ")";
220 "(case " ^ t ^ " of " ^ space_implode " | " (map (fn (p, t) => p ^ " => " ^ t) cs) ^ ")";
221 fun ml_Let d e = "let\n" ^ d ^ " in " ^ e ^ " end";
222 fun ml_as v t = "(" ^ v ^ " as " ^ t ^ ")";
224 fun ml_and [] = "true"
226 | ml_and xs = "(" ^ space_implode " andalso " xs ^ ")";
227 fun ml_if b x y = "(if " ^ b ^ " then " ^ x ^ " else " ^ y ^ ")";
229 fun ml_list es = "[" ^ commas es ^ "]";
231 fun ml_fundefs ([(name, [([], e)])]) =
232 "val " ^ name ^ " = " ^ e ^ "\n"
233 | ml_fundefs (eqs :: eqss) =
235 fun fundef (name, eqs) =
237 fun eqn (es, e) = name ^ " " ^ space_implode " " es ^ " = " ^ e
238 in space_implode "\n | " (map eqn eqs) end;
240 (prefix "fun " o fundef) eqs :: map (prefix "and " o fundef) eqss
246 (* nbe specific syntax and sandbox communication *)
248 structure Univs = Proof_Data (
249 type T = unit -> Univ list -> Univ list
250 fun init _ () = error "Univs"
252 val put_result = Univs.put;
256 val name_put = prefix ^ "put_result";
257 val name_ref = prefix ^ "univs_ref";
258 val name_const = prefix ^ "Const";
259 val name_abss = prefix ^ "abss";
260 val name_apps = prefix ^ "apps";
261 val name_eq = prefix ^ "eq_Univ";
264 val univs_cookie = (Univs.get, put_result, name_put);
266 fun nbe_fun 0 "" = "nbe_value"
267 | nbe_fun i c = "c_" ^ translate_string (fn "." => "_" | c => c) c ^ "_" ^ string_of_int i;
268 fun nbe_dict v n = "d_" ^ v ^ "_" ^ string_of_int n;
269 fun nbe_bound v = "v_" ^ v;
270 fun nbe_bound_optional NONE = "_"
271 | nbe_bound_optional (SOME v) = nbe_bound v;
272 fun nbe_default v = "w_" ^ v;
274 (*note: these three are the "turning spots" where proper argument order is established!*)
275 fun nbe_apps t [] = t
276 | nbe_apps t ts = name_apps `$$` [t, ml_list (rev ts)];
277 fun nbe_apps_local i c ts = nbe_fun i c `$` ml_list (rev ts);
278 fun nbe_apps_constr idx_of c ts =
280 val c' = if !trace then string_of_int (idx_of c) ^ " (*" ^ c ^ "*)"
281 else string_of_int (idx_of c);
282 in name_const `$` ("(" ^ c' ^ ", " ^ ml_list (rev ts) ^ ")") end;
284 fun nbe_abss 0 f = f `$` ml_list []
285 | nbe_abss n f = name_abss `$$` [string_of_int n, f];
287 fun nbe_eq (v1, v2) = "(" ^ name_eq ^ " (" ^ nbe_bound v1 ^ ", " ^ nbe_bound v2 ^ "))";
291 open Basic_Code_Thingol;
294 (* code generation *)
296 fun assemble_eqnss idx_of deps eqnss =
298 fun prep_eqns (c, (vs, eqns)) =
300 val dicts = maps (fn (v, sort) => map_index (nbe_dict v o fst) sort) vs;
301 val num_args = length dicts + ((length o fst o hd) eqns);
302 in (c, (num_args, (dicts, eqns))) end;
303 val eqnss' = map prep_eqns eqnss;
305 fun assemble_constapp c dss ts =
307 val ts' = (maps o map) assemble_idict dss @ ts;
308 in case AList.lookup (op =) eqnss' c
309 of SOME (num_args, _) => if num_args <= length ts'
310 then let val (ts1, ts2) = chop num_args ts'
311 in nbe_apps (nbe_apps_local 0 c ts1) ts2
312 end else nbe_apps (nbe_abss num_args (nbe_fun 0 c)) ts'
313 | NONE => if member (op =) deps c
314 then nbe_apps (nbe_fun 0 c) ts'
315 else nbe_apps_constr idx_of c ts'
317 and assemble_idict (DictConst (inst, dss)) =
318 assemble_constapp inst dss []
319 | assemble_idict (DictVar (supers, (v, (n, _)))) =
320 fold_rev (fn super => assemble_constapp super [] o single) supers (nbe_dict v n);
322 fun assemble_iterm constapp =
324 fun of_iterm match_cont t =
326 val (t', ts) = Code_Thingol.unfold_app t
327 in of_iapp match_cont t' (fold_rev (cons o of_iterm NONE) ts []) end
328 and of_iapp match_cont (IConst (c, ((_, dss), _))) ts = constapp c dss ts
329 | of_iapp match_cont (IVar v) ts = nbe_apps (nbe_bound_optional v) ts
330 | of_iapp match_cont ((v, _) `|=> t) ts =
331 nbe_apps (nbe_abss 1 (ml_abs (ml_list [nbe_bound_optional v]) (of_iterm NONE t))) ts
332 | of_iapp match_cont (ICase (((t, _), cs), t0)) ts =
333 nbe_apps (ml_cases (of_iterm NONE t)
334 (map (fn (p, t) => (of_iterm NONE p, of_iterm match_cont t)) cs
335 @ [("_", case match_cont of SOME s => s | NONE => of_iterm NONE t0)])) ts
338 fun subst_nonlin_vars args =
340 val vs = (fold o Code_Thingol.fold_varnames)
341 (fn v => AList.map_default (op =) (v, 0) (Integer.add 1)) args [];
342 val names = Name.make_context (map fst vs);
343 fun declare v k ctxt = let val vs = Name.invents ctxt v k
344 in (vs, fold Name.declare vs ctxt) end;
345 val (vs_renames, _) = fold_map (fn (v, k) => if k > 1
346 then declare v (k - 1) #>> (fn vs => (v, vs))
347 else pair (v, [])) vs names;
348 val samepairs = maps (fn (v, vs) => map (pair v) vs) vs_renames;
349 fun subst_vars (t as IConst _) samepairs = (t, samepairs)
350 | subst_vars (t as IVar NONE) samepairs = (t, samepairs)
351 | subst_vars (t as IVar (SOME v)) samepairs = (case AList.lookup (op =) samepairs v
352 of SOME v' => (IVar (SOME v'), AList.delete (op =) v samepairs)
353 | NONE => (t, samepairs))
354 | subst_vars (t1 `$ t2) samepairs = samepairs
358 | subst_vars (ICase (_, t)) samepairs = subst_vars t samepairs;
359 val (args', _) = fold_map subst_vars args samepairs;
360 in (samepairs, args') end;
362 fun assemble_eqn c dicts default_args (i, (args, rhs)) =
364 val is_eval = (c = "");
365 val default_rhs = nbe_apps_local (i+1) c (dicts @ default_args);
366 val match_cont = if is_eval then NONE else SOME default_rhs;
367 val assemble_arg = assemble_iterm
368 (fn c => fn _ => fn ts => nbe_apps_constr idx_of c ts) NONE;
369 val assemble_rhs = assemble_iterm assemble_constapp match_cont;
370 val (samepairs, args') = subst_nonlin_vars args;
371 val s_args = map assemble_arg args';
372 val s_rhs = if null samepairs then assemble_rhs rhs
373 else ml_if (ml_and (map nbe_eq samepairs))
374 (assemble_rhs rhs) default_rhs;
375 val eqns = if is_eval then
376 [([ml_list (rev (dicts @ s_args))], s_rhs)]
378 [([ml_list (rev (dicts @ map2 ml_as default_args s_args))], s_rhs),
379 ([ml_list (rev (dicts @ default_args))], default_rhs)]
380 in (nbe_fun i c, eqns) end;
382 fun assemble_eqns (c, (num_args, (dicts, eqns))) =
384 val default_args = map nbe_default
385 (Name.invent_list [] "a" (num_args - length dicts));
386 val eqns' = map_index (assemble_eqn c dicts default_args) eqns
387 @ (if c = "" then [] else [(nbe_fun (length eqns) c,
388 [([ml_list (rev (dicts @ default_args))],
389 nbe_apps_constr idx_of c (dicts @ default_args))])]);
390 in (eqns', nbe_abss num_args (nbe_fun 0 c)) end;
392 val (fun_vars, fun_vals) = map_split assemble_eqns eqnss';
393 val deps_vars = ml_list (map (nbe_fun 0) deps);
394 in ml_abs deps_vars (ml_Let (ml_fundefs (flat fun_vars)) (ml_list fun_vals)) end;
397 (* compile equations *)
399 fun compile_eqnss thy nbe_program raw_deps [] = []
400 | compile_eqnss thy nbe_program raw_deps eqnss =
402 val ctxt = ProofContext.init_global thy;
403 val (deps, deps_vals) = split_list (map_filter
404 (fn dep => Option.map (fn univ => (dep, univ)) (fst ((Graph.get_node nbe_program dep)))) raw_deps);
405 val idx_of = raw_deps
406 |> map (fn dep => (dep, snd (Graph.get_node nbe_program dep)))
407 |> AList.lookup (op =)
408 |> (fn f => the o f);
409 val s = assemble_eqnss idx_of deps eqnss;
410 val cs = map fst eqnss;
413 |> traced (fn s => "\n--- code to be evaluated:\n" ^ s)
415 |> Code_Runtime.value ctxt univs_cookie
416 |> (fn f => f deps_vals)
417 |> (fn univs => cs ~~ univs)
421 (* extract equations from statements *)
423 fun eqns_of_stmt (_, Code_Thingol.Fun (_, ((_, []), _))) =
425 | eqns_of_stmt (const, Code_Thingol.Fun (_, (((vs, _), eqns), _))) =
426 [(const, (vs, map fst eqns))]
427 | eqns_of_stmt (_, Code_Thingol.Datatypecons _) =
429 | eqns_of_stmt (_, Code_Thingol.Datatype _) =
431 | eqns_of_stmt (class, Code_Thingol.Class (_, (v, (super_classes, classparams)))) =
433 val names = map snd super_classes @ map fst classparams;
434 val params = Name.invent_list [] "d" (length names);
437 [([IConst (class, (([], []), [])) `$$ map (IVar o SOME) params],
438 IVar (SOME (nth params k)))]));
439 in map_index mk names end
440 | eqns_of_stmt (_, Code_Thingol.Classrel _) =
442 | eqns_of_stmt (_, Code_Thingol.Classparam _) =
444 | eqns_of_stmt (inst, Code_Thingol.Classinst ((class, (_, arity_args)), (super_instances, (classparam_instances, _)))) =
445 [(inst, (arity_args, [([], IConst (class, (([], []), [])) `$$
446 map (fn (_, (_, (inst, dss))) => IConst (inst, (([], dss), []))) super_instances
447 @ map (IConst o snd o fst) classparam_instances)]))];
450 (* compile whole programs *)
452 fun ensure_const_idx name (nbe_program, (maxidx, idx_tab)) =
453 if can (Graph.get_node nbe_program) name
454 then (nbe_program, (maxidx, idx_tab))
455 else (Graph.new_node (name, (NONE, maxidx)) nbe_program,
456 (maxidx + 1, Inttab.update_new (maxidx, name) idx_tab));
458 fun compile_stmts thy stmts_deps =
460 val names = map (fst o fst) stmts_deps;
461 val names_deps = map (fn ((name, _), deps) => (name, deps)) stmts_deps;
462 val eqnss = maps (eqns_of_stmt o fst) stmts_deps;
463 val refl_deps = names_deps
466 |> fold (insert (op =)) names;
467 fun compile nbe_program = eqnss
468 |> compile_eqnss thy nbe_program refl_deps
469 |> rpair nbe_program;
471 fold ensure_const_idx refl_deps
472 #> apfst (fold (fn (name, deps) => fold (curry Graph.add_edge name) deps) names_deps
474 #-> fold (fn (name, univ) => (Graph.map_node name o apfst) (K (SOME univ))))
477 fun compile_program thy program =
479 fun add_stmts names (nbe_program, (maxidx, idx_tab)) = if exists ((can o Graph.get_node) nbe_program) names
480 then (nbe_program, (maxidx, idx_tab))
481 else (nbe_program, (maxidx, idx_tab))
482 |> compile_stmts thy (map (fn name => ((name, Graph.get_node program name),
483 Graph.imm_succs program name)) names);
485 fold_rev add_stmts (Graph.strong_conn program)
491 (* term evaluation by compilation *)
493 fun compile_term thy nbe_program deps (vs : (string * sort) list, t) =
495 val dict_frees = maps (fn (v, sort) => map_index (curry DFree v o fst) sort) vs;
497 ("", (vs, [([], t)]))
498 |> singleton (compile_eqnss thy nbe_program deps)
500 |> (fn t => apps t (rev dict_frees))
506 fun typ_of_itype program vs (ityco `%% itys) =
508 val Code_Thingol.Datatype (tyco, _) = Graph.get_node program ityco;
509 in Type (tyco, map (typ_of_itype program vs) itys) end
510 | typ_of_itype program vs (ITyVar v) =
512 val sort = (the o AList.lookup (op =) vs) v;
513 in TFree ("'" ^ v, sort) end;
515 fun term_of_univ thy program idx_tab t =
517 fun take_until f [] = []
518 | take_until f (x::xs) = if f x then [] else x :: take_until f xs;
519 fun is_dict (Const (idx, _)) = (case (Graph.get_node program o the o Inttab.lookup idx_tab) idx
520 of Code_Thingol.Class _ => true
521 | Code_Thingol.Classrel _ => true
522 | Code_Thingol.Classinst _ => true
524 | is_dict (DFree _) = true
526 fun const_of_idx idx = (case (Graph.get_node program o the o Inttab.lookup idx_tab) idx
527 of Code_Thingol.Fun (c, _) => c
528 | Code_Thingol.Datatypecons (c, _) => c
529 | Code_Thingol.Classparam (c, _) => c);
530 fun of_apps bounds (t, ts) =
531 fold_map (of_univ bounds) ts
532 #>> (fn ts' => list_comb (t, rev ts'))
533 and of_univ bounds (Const (idx, ts)) typidx =
535 val ts' = take_until is_dict ts;
536 val c = const_of_idx idx;
537 val T = map_type_tvar (fn ((v, i), _) =>
538 Type_Infer.param typidx (v ^ string_of_int i, []))
539 (Sign.the_const_type thy c);
540 val typidx' = typidx + 1;
541 in of_apps bounds (Term.Const (c, T), ts') typidx' end
542 | of_univ bounds (BVar (n, ts)) typidx =
543 of_apps bounds (Bound (bounds - n - 1), ts) typidx
544 | of_univ bounds (t as Abs _) typidx =
546 |> of_univ (bounds + 1) (apps t [BVar (bounds, [])])
547 |-> (fn t' => pair (Term.Abs ("u", dummyT, t')))
548 in of_univ 0 t 0 |> fst end;
551 (* evaluation with type reconstruction *)
553 fun eval_term thy program (nbe_program, idx_tab) ((vs0, (vs, ty)), t) deps =
555 val ctxt = Syntax.init_pretty_global thy;
556 val string_of_term = Syntax.string_of_term (Config.put show_types true ctxt);
557 val ty' = typ_of_itype program vs0 ty;
558 fun type_infer t = singleton
559 (Type_Infer.infer_types ctxt (try (Type.strip_sorts o Sign.the_const_type thy)) (K NONE))
560 (Type.constraint ty' t);
562 if null (Term.add_tvars t []) then t
563 else error ("Illegal schematic type variables in normalized term: " ^ string_of_term t);
565 compile_term thy nbe_program deps (vs, t)
566 |> term_of_univ thy program idx_tab
567 |> traced (fn t => "Normalized:\n" ^ string_of_term t)
569 |> traced (fn t => "Types inferred:\n" ^ string_of_term t)
571 |> traced (fn _ => "---\n")
577 structure Nbe_Functions = Code_Data
579 type T = (Univ option * int) Graph.T * (int * string Inttab.table);
580 val empty = (Graph.empty, (0, Inttab.empty));
583 fun compile ignore_cache thy program =
585 val (nbe_program, (_, idx_tab)) =
586 Nbe_Functions.change (if ignore_cache then NONE else SOME thy)
587 (compile_program thy program);
588 in (nbe_program, idx_tab) end;
591 (* dynamic evaluation oracle *)
593 fun mk_equals thy lhs raw_rhs =
595 val ty = Thm.typ_of (Thm.ctyp_of_term lhs);
596 val eq = Thm.cterm_of thy (Term.Const ("==", ty --> ty --> propT));
597 val rhs = Thm.cterm_of thy raw_rhs;
598 in Thm.mk_binop eq lhs rhs end;
600 val (_, raw_oracle) = Context.>>> (Context.map_theory_result
601 (Thm.add_oracle (Binding.name "normalization_by_evaluation",
602 fn (thy, program, nbe_program_idx_tab, vsp_ty_t, deps, ct) =>
603 mk_equals thy ct (eval_term thy program nbe_program_idx_tab vsp_ty_t deps))));
605 fun oracle thy program nbe_program_idx_tab vsp_ty_t deps ct =
606 raw_oracle (thy, program, nbe_program_idx_tab, vsp_ty_t, deps, ct);
608 val dynamic_eval_conv = Conv.tap_thy (fn thy =>
609 lift_triv_classes_conv thy (Code_Thingol.dynamic_eval_conv thy
610 (K (fn program => oracle thy program (compile false thy program)))));
612 fun dynamic_eval_value thy = lift_triv_classes_rew thy
613 (Code_Thingol.dynamic_eval_value thy I
614 (K (fn program => eval_term thy program (compile false thy program))));
616 fun static_eval_conv thy consts =
617 lift_triv_classes_conv thy (Code_Thingol.static_eval_conv thy consts
618 (K (fn program => let val nbe_program = compile true thy program
619 in fn thy => oracle thy program nbe_program end)));
624 val setup = Value.add_evaluator ("nbe", dynamic_eval_value o ProofContext.theory_of);