(* Title: Tools/nbe.ML
Authors: Klaus Aehlig, LMU Muenchen; Tobias Nipkow, Florian Haftmann, TU Muenchen
Normalization by evaluation, based on generic code generator.
*)
signature NBE =
sig
val dynamic_conv: theory -> conv
val dynamic_value: theory -> term -> term
val static_conv: theory -> string list -> conv
val static_value: theory -> string list -> term -> term
datatype Univ =
Const of int * Univ list (*named (uninterpreted) constants*)
| DFree of string * int (*free (uninterpreted) dictionary parameters*)
| BVar of int * Univ list
| Abs of (int * (Univ list -> Univ)) * Univ list
val apps: Univ -> Univ list -> Univ (*explicit applications*)
val abss: int -> (Univ list -> Univ) -> Univ
(*abstractions as closures*)
val same: Univ * Univ -> bool
val put_result: (unit -> Univ list -> Univ list) -> Proof.context -> Proof.context
val trace: bool Unsynchronized.ref
val setup: theory -> theory
val add_const_alias: thm -> theory -> theory
end;
structure Nbe: NBE =
struct
(* generic non-sense *)
val trace = Unsynchronized.ref false;
fun traced f x = if !trace then (tracing (f x); x) else x;
(** certificates and oracle for "trivial type classes" **)
structure Triv_Class_Data = Theory_Data
(
type T = (class * thm) list;
val empty = [];
val extend = I;
fun merge data : T = AList.merge (op =) (K true) data;
);
fun add_const_alias thm thy =
let
val (ofclass, eqn) = case try Logic.dest_equals (Thm.prop_of thm)
of SOME ofclass_eq => ofclass_eq
| _ => error ("Bad certificate: " ^ Display.string_of_thm_global thy thm);
val (T, class) = case try Logic.dest_of_class ofclass
of SOME T_class => T_class
| _ => error ("Bad certificate: " ^ Display.string_of_thm_global thy thm);
val tvar = case try Term.dest_TVar T
of SOME (tvar as (_, sort)) => if null (filter (can (AxClass.get_info thy)) sort)
then tvar
else error ("Bad sort: " ^ Display.string_of_thm_global thy thm)
| _ => error ("Bad type: " ^ Display.string_of_thm_global thy thm);
val _ = if Term.add_tvars eqn [] = [tvar] then ()
else error ("Inconsistent type: " ^ Display.string_of_thm_global thy thm);
val lhs_rhs = case try Logic.dest_equals eqn
of SOME lhs_rhs => lhs_rhs
| _ => error ("Not an equation: " ^ Syntax.string_of_term_global thy eqn);
val c_c' = case try (pairself (AxClass.unoverload_const thy o dest_Const)) lhs_rhs
of SOME c_c' => c_c'
| _ => error ("Not an equation with two constants: "
^ Syntax.string_of_term_global thy eqn);
val _ = if the_list (AxClass.class_of_param thy (snd c_c')) = [class] then ()
else error ("Inconsistent class: " ^ Display.string_of_thm_global thy thm);
in Triv_Class_Data.map (AList.update (op =) (class, thm)) thy end;
local
val get_triv_classes = map fst o Triv_Class_Data.get;
val (_, triv_of_class) = Context.>>> (Context.map_theory_result
(Thm.add_oracle (@{binding triv_of_class}, fn (thy, T, class) =>
Thm.cterm_of thy (Logic.mk_of_class (T, class)))));
in
fun lift_triv_classes_conv thy conv ct =
let
val algebra = Sign.classes_of thy;
val certT = Thm.ctyp_of thy;
val triv_classes = get_triv_classes thy;
fun additional_classes sort = filter_out (fn class => Sorts.sort_le algebra (sort, [class])) triv_classes;
fun mk_entry (v, sort) =
let
val T = TFree (v, sort);
val cT = certT T;
val triv_sort = additional_classes sort;
in
(v, (Sorts.inter_sort algebra (sort, triv_sort),
(cT, AList.make (fn class => Thm.of_class (cT, class)) sort
@ AList.make (fn class => triv_of_class (thy, T, class)) triv_sort)))
end;
val vs_tab = map mk_entry (Term.add_tfrees (Thm.term_of ct) []);
fun instantiate thm =
let
val cert_tvars = map (certT o TVar) (Term.add_tvars
((fst o Logic.dest_equals o Logic.strip_imp_concl o Thm.prop_of) thm) []);
val instantiation =
map2 (fn cert_tvar => fn (_, (_, (cT, _))) => (cert_tvar, cT)) cert_tvars vs_tab;
in Thm.instantiate (instantiation, []) thm end;
fun of_class (TFree (v, _), class) =
the (AList.lookup (op =) ((snd o snd o the o AList.lookup (op =) vs_tab) v) class)
| of_class (T, _) = error ("Bad type " ^ Syntax.string_of_typ_global thy T);
fun strip_of_class thm =
let
val prems_of_class = Thm.prop_of thm
|> Logic.strip_imp_prems
|> map (Logic.dest_of_class #> of_class);
in fold Thm.elim_implies prems_of_class thm end;
in
ct
|> (Drule.cterm_fun o map_types o map_type_tfree)
(fn (v, _) => TFree (v, (fst o the o AList.lookup (op =) vs_tab) v))
|> conv
|> Thm.strip_shyps
|> Thm.varifyT_global
|> Thm.unconstrainT
|> instantiate
|> strip_of_class
end;
fun lift_triv_classes_rew thy rew t =
let
val algebra = Sign.classes_of thy;
val triv_classes = get_triv_classes thy;
val vs = Term.add_tfrees t [];
in t
|> (map_types o map_type_tfree)
(fn (v, sort) => TFree (v, Sorts.inter_sort algebra (sort, triv_classes)))
|> rew
|> (map_types o map_type_tfree)
(fn (v, _) => TFree (v, the (AList.lookup (op =) vs v)))
end;
end;
(** the semantic universe **)
(*
Functions are given by their semantical function value. To avoid
trouble with the ML-type system, these functions have the most
generic type, that is "Univ list -> Univ". The calling convention is
that the arguments come as a list, the last argument first. In
other words, a function call that usually would look like
f x_1 x_2 ... x_n or f(x_1,x_2, ..., x_n)
would be in our convention called as
f [x_n,..,x_2,x_1]
Moreover, to handle functions that are still waiting for some
arguments we have additionally a list of arguments collected to far
and the number of arguments we're still waiting for.
*)
datatype Univ =
Const of int * Univ list (*named (uninterpreted) constants*)
| DFree of string * int (*free (uninterpreted) dictionary parameters*)
| BVar of int * Univ list (*bound variables, named*)
| Abs of (int * (Univ list -> Univ)) * Univ list
(*abstractions as closures*);
(* constructor functions *)
fun abss n f = Abs ((n, f), []);
fun apps (Abs ((n, f), xs)) ys = let val k = n - length ys in
case int_ord (k, 0)
of EQUAL => f (ys @ xs)
| LESS => let val (zs, ws) = chop (~ k) ys in apps (f (ws @ xs)) zs end
| GREATER => Abs ((k, f), ys @ xs) (*note: reverse convention also for apps!*)
end
| apps (Const (name, xs)) ys = Const (name, ys @ xs)
| apps (BVar (n, xs)) ys = BVar (n, ys @ xs);
fun same (Const (k, xs), Const (l, ys)) = k = l andalso eq_list same (xs, ys)
| same (DFree (s, k), DFree (t, l)) = s = t andalso k = l
| same (BVar (k, xs), BVar (l, ys)) = k = l andalso eq_list same (xs, ys)
| same _ = false;
(** assembling and compiling ML code from terms **)
(* abstract ML syntax *)
infix 9 `$` `$$`;
fun e1 `$` e2 = "(" ^ e1 ^ " " ^ e2 ^ ")";
fun e `$$` [] = e
| e `$$` es = "(" ^ e ^ " " ^ space_implode " " es ^ ")";
fun ml_abs v e = "(fn " ^ v ^ " => " ^ e ^ ")";
fun ml_cases t cs =
"(case " ^ t ^ " of " ^ space_implode " | " (map (fn (p, t) => p ^ " => " ^ t) cs) ^ ")";
fun ml_Let d e = "let\n" ^ d ^ " in " ^ e ^ " end";
fun ml_as v t = "(" ^ v ^ " as " ^ t ^ ")";
fun ml_and [] = "true"
| ml_and [x] = x
| ml_and xs = "(" ^ space_implode " andalso " xs ^ ")";
fun ml_if b x y = "(if " ^ b ^ " then " ^ x ^ " else " ^ y ^ ")";
fun ml_list es = "[" ^ commas es ^ "]";
fun ml_fundefs ([(name, [([], e)])]) =
"val " ^ name ^ " = " ^ e ^ "\n"
| ml_fundefs (eqs :: eqss) =
let
fun fundef (name, eqs) =
let
fun eqn (es, e) = name ^ " " ^ space_implode " " es ^ " = " ^ e
in space_implode "\n | " (map eqn eqs) end;
in
(prefix "fun " o fundef) eqs :: map (prefix "and " o fundef) eqss
|> cat_lines
|> suffix "\n"
end;
(* nbe specific syntax and sandbox communication *)
structure Univs = Proof_Data
(
type T = unit -> Univ list -> Univ list
(* FIXME avoid user error with non-user text *)
fun init _ () = error "Univs"
);
val put_result = Univs.put;
local
val prefix = "Nbe.";
val name_put = prefix ^ "put_result";
val name_const = prefix ^ "Const";
val name_abss = prefix ^ "abss";
val name_apps = prefix ^ "apps";
val name_same = prefix ^ "same";
in
val univs_cookie = (Univs.get, put_result, name_put);
fun nbe_fun 0 "" = "nbe_value"
| nbe_fun i c = "c_" ^ translate_string (fn "." => "_" | c => c) c ^ "_" ^ string_of_int i;
fun nbe_dict v n = "d_" ^ v ^ "_" ^ string_of_int n;
fun nbe_bound v = "v_" ^ v;
fun nbe_bound_optional NONE = "_"
| nbe_bound_optional (SOME v) = nbe_bound v;
fun nbe_default v = "w_" ^ v;
(*note: these three are the "turning spots" where proper argument order is established!*)
fun nbe_apps t [] = t
| nbe_apps t ts = name_apps `$$` [t, ml_list (rev ts)];
fun nbe_apps_local i c ts = nbe_fun i c `$` ml_list (rev ts);
fun nbe_apps_constr idx_of c ts =
let
val c' = if !trace then string_of_int (idx_of c) ^ " (*" ^ c ^ "*)"
else string_of_int (idx_of c);
in name_const `$` ("(" ^ c' ^ ", " ^ ml_list (rev ts) ^ ")") end;
fun nbe_abss 0 f = f `$` ml_list []
| nbe_abss n f = name_abss `$$` [string_of_int n, f];
fun nbe_same (v1, v2) = "(" ^ name_same ^ " (" ^ nbe_bound v1 ^ ", " ^ nbe_bound v2 ^ "))";
end;
open Basic_Code_Thingol;
(* code generation *)
fun assemble_eqnss idx_of deps eqnss =
let
fun prep_eqns (c, (vs, eqns)) =
let
val dicts = maps (fn (v, sort) => map_index (nbe_dict v o fst) sort) vs;
val num_args = length dicts + ((length o fst o hd) eqns);
in (c, (num_args, (dicts, eqns))) end;
val eqnss' = map prep_eqns eqnss;
fun assemble_constapp c dss ts =
let
val ts' = (maps o map) assemble_dict dss @ ts;
in case AList.lookup (op =) eqnss' c
of SOME (num_args, _) => if num_args <= length ts'
then let val (ts1, ts2) = chop num_args ts'
in nbe_apps (nbe_apps_local 0 c ts1) ts2
end else nbe_apps (nbe_abss num_args (nbe_fun 0 c)) ts'
| NONE => if member (op =) deps c
then nbe_apps (nbe_fun 0 c) ts'
else nbe_apps_constr idx_of c ts'
end
and assemble_classrels classrels =
fold_rev (fn classrel => assemble_constapp classrel [] o single) classrels
and assemble_dict (Dict (classrels, x)) =
assemble_classrels classrels (assemble_plain_dict x)
and assemble_plain_dict (Dict_Const (inst, dss)) =
assemble_constapp inst dss []
| assemble_plain_dict (Dict_Var (v, (n, _))) =
nbe_dict v n
fun assemble_iterm constapp =
let
fun of_iterm match_cont t =
let
val (t', ts) = Code_Thingol.unfold_app t
in of_iapp match_cont t' (fold_rev (cons o of_iterm NONE) ts []) end
and of_iapp match_cont (IConst { name = c, dicts = dss, ... }) ts = constapp c dss ts
| of_iapp match_cont (IVar v) ts = nbe_apps (nbe_bound_optional v) ts
| of_iapp match_cont ((v, _) `|=> t) ts =
nbe_apps (nbe_abss 1 (ml_abs (ml_list [nbe_bound_optional v]) (of_iterm NONE t))) ts
| of_iapp match_cont (ICase { term = t, clauses = clauses, primitive = t0, ... }) ts =
nbe_apps (ml_cases (of_iterm NONE t)
(map (fn (p, t) => (of_iterm NONE p, of_iterm match_cont t)) clauses
@ [("_", case match_cont of SOME s => s | NONE => of_iterm NONE t0)])) ts
in of_iterm end;
fun subst_nonlin_vars args =
let
val vs = (fold o Code_Thingol.fold_varnames)
(fn v => AList.map_default (op =) (v, 0) (Integer.add 1)) args [];
val names = Name.make_context (map fst vs);
fun declare v k ctxt =
let val vs = Name.invent ctxt v k
in (vs, fold Name.declare vs ctxt) end;
val (vs_renames, _) = fold_map (fn (v, k) => if k > 1
then declare v (k - 1) #>> (fn vs => (v, vs))
else pair (v, [])) vs names;
val samepairs = maps (fn (v, vs) => map (pair v) vs) vs_renames;
fun subst_vars (t as IConst _) samepairs = (t, samepairs)
| subst_vars (t as IVar NONE) samepairs = (t, samepairs)
| subst_vars (t as IVar (SOME v)) samepairs = (case AList.lookup (op =) samepairs v
of SOME v' => (IVar (SOME v'), AList.delete (op =) v samepairs)
| NONE => (t, samepairs))
| subst_vars (t1 `$ t2) samepairs = samepairs
|> subst_vars t1
||>> subst_vars t2
|>> (op `$)
| subst_vars (ICase { primitive = t, ... }) samepairs = subst_vars t samepairs;
val (args', _) = fold_map subst_vars args samepairs;
in (samepairs, args') end;
fun assemble_eqn c dicts default_args (i, (args, rhs)) =
let
val is_eval = (c = "");
val default_rhs = nbe_apps_local (i+1) c (dicts @ default_args);
val match_cont = if is_eval then NONE else SOME default_rhs;
val assemble_arg = assemble_iterm
(fn c => fn _ => fn ts => nbe_apps_constr idx_of c ts) NONE;
val assemble_rhs = assemble_iterm assemble_constapp match_cont;
val (samepairs, args') = subst_nonlin_vars args;
val s_args = map assemble_arg args';
val s_rhs = if null samepairs then assemble_rhs rhs
else ml_if (ml_and (map nbe_same samepairs))
(assemble_rhs rhs) default_rhs;
val eqns = if is_eval then
[([ml_list (rev (dicts @ s_args))], s_rhs)]
else
[([ml_list (rev (dicts @ map2 ml_as default_args s_args))], s_rhs),
([ml_list (rev (dicts @ default_args))], default_rhs)]
in (nbe_fun i c, eqns) end;
fun assemble_eqns (c, (num_args, (dicts, eqns))) =
let
val default_args = map nbe_default
(Name.invent Name.context "a" (num_args - length dicts));
val eqns' = map_index (assemble_eqn c dicts default_args) eqns
@ (if c = "" then [] else [(nbe_fun (length eqns) c,
[([ml_list (rev (dicts @ default_args))],
nbe_apps_constr idx_of c (dicts @ default_args))])]);
in (eqns', nbe_abss num_args (nbe_fun 0 c)) end;
val (fun_vars, fun_vals) = map_split assemble_eqns eqnss';
val deps_vars = ml_list (map (nbe_fun 0) deps);
in ml_abs deps_vars (ml_Let (ml_fundefs (flat fun_vars)) (ml_list fun_vals)) end;
(* compile equations *)
fun compile_eqnss thy nbe_program raw_deps [] = []
| compile_eqnss thy nbe_program raw_deps eqnss =
let
val ctxt = Proof_Context.init_global thy;
val (deps, deps_vals) = split_list (map_filter
(fn dep => Option.map (fn univ => (dep, univ)) (fst ((Graph.get_node nbe_program dep)))) raw_deps);
val idx_of = raw_deps
|> map (fn dep => (dep, snd (Graph.get_node nbe_program dep)))
|> AList.lookup (op =)
|> (fn f => the o f);
val s = assemble_eqnss idx_of deps eqnss;
val cs = map fst eqnss;
in
s
|> traced (fn s => "\n--- code to be evaluated:\n" ^ s)
|> pair ""
|> Code_Runtime.value ctxt univs_cookie
|> (fn f => f deps_vals)
|> (fn univs => cs ~~ univs)
end;
(* extract equations from statements *)
fun dummy_const c dss =
IConst { name = c, typargs = [], dicts = dss,
dom = [], range = ITyVar "", annotate = false };
fun eqns_of_stmt (_, Code_Thingol.Fun (_, ((_, []), _))) =
[]
| eqns_of_stmt (const, Code_Thingol.Fun (_, (((vs, _), eqns), _))) =
[(const, (vs, map fst eqns))]
| eqns_of_stmt (_, Code_Thingol.Datatypecons _) =
[]
| eqns_of_stmt (_, Code_Thingol.Datatype _) =
[]
| eqns_of_stmt (class, Code_Thingol.Class (_, (v, (super_classes, classparams)))) =
let
val names = map snd super_classes @ map fst classparams;
val params = Name.invent Name.context "d" (length names);
fun mk (k, name) =
(name, ([(v, [])],
[([dummy_const class [] `$$ map (IVar o SOME) params],
IVar (SOME (nth params k)))]));
in map_index mk names end
| eqns_of_stmt (_, Code_Thingol.Classrel _) =
[]
| eqns_of_stmt (_, Code_Thingol.Classparam _) =
[]
| eqns_of_stmt (inst, Code_Thingol.Classinst { class, vs, superinsts, inst_params, ... }) =
[(inst, (vs, [([], dummy_const class [] `$$
map (fn (_, (_, (inst, dss))) => dummy_const inst dss) superinsts
@ map (IConst o snd o fst) inst_params)]))];
(* compile whole programs *)
fun ensure_const_idx name (nbe_program, (maxidx, idx_tab)) =
if can (Graph.get_node nbe_program) name
then (nbe_program, (maxidx, idx_tab))
else (Graph.new_node (name, (NONE, maxidx)) nbe_program,
(maxidx + 1, Inttab.update_new (maxidx, name) idx_tab));
fun compile_stmts thy stmts_deps =
let
val names = map (fst o fst) stmts_deps;
val names_deps = map (fn ((name, _), deps) => (name, deps)) stmts_deps;
val eqnss = maps (eqns_of_stmt o fst) stmts_deps;
val refl_deps = names_deps
|> maps snd
|> distinct (op =)
|> fold (insert (op =)) names;
fun compile nbe_program = eqnss
|> compile_eqnss thy nbe_program refl_deps
|> rpair nbe_program;
in
fold ensure_const_idx refl_deps
#> apfst (fold (fn (name, deps) => fold (curry Graph.add_edge name) deps) names_deps
#> compile
#-> fold (fn (name, univ) => (Graph.map_node name o apfst) (K (SOME univ))))
end;
fun compile_program thy program =
let
fun add_stmts names (nbe_program, (maxidx, idx_tab)) = if exists ((can o Graph.get_node) nbe_program) names
then (nbe_program, (maxidx, idx_tab))
else (nbe_program, (maxidx, idx_tab))
|> compile_stmts thy (map (fn name => ((name, Graph.get_node program name),
Graph.immediate_succs program name)) names);
in
fold_rev add_stmts (Graph.strong_conn program)
end;
(** evaluation **)
(* term evaluation by compilation *)
fun compile_term thy nbe_program deps (vs : (string * sort) list, t) =
let
val dict_frees = maps (fn (v, sort) => map_index (curry DFree v o fst) sort) vs;
in
("", (vs, [([], t)]))
|> singleton (compile_eqnss thy nbe_program deps)
|> snd
|> (fn t => apps t (rev dict_frees))
end;
(* reconstruction *)
fun typ_of_itype program vs (ityco `%% itys) =
let
val Code_Thingol.Datatype (tyco, _) = Graph.get_node program ityco;
in Type (tyco, map (typ_of_itype program vs) itys) end
| typ_of_itype program vs (ITyVar v) =
let
val sort = (the o AList.lookup (op =) vs) v;
in TFree ("'" ^ v, sort) end;
fun term_of_univ thy program idx_tab t =
let
fun take_until f [] = []
| take_until f (x::xs) = if f x then [] else x :: take_until f xs;
fun is_dict (Const (idx, _)) = (case (Graph.get_node program o the o Inttab.lookup idx_tab) idx
of Code_Thingol.Class _ => true
| Code_Thingol.Classrel _ => true
| Code_Thingol.Classinst _ => true
| _ => false)
| is_dict (DFree _) = true
| is_dict _ = false;
fun const_of_idx idx = (case (Graph.get_node program o the o Inttab.lookup idx_tab) idx
of Code_Thingol.Fun (c, _) => c
| Code_Thingol.Datatypecons (c, _) => c
| Code_Thingol.Classparam (c, _) => c);
fun of_apps bounds (t, ts) =
fold_map (of_univ bounds) ts
#>> (fn ts' => list_comb (t, rev ts'))
and of_univ bounds (Const (idx, ts)) typidx =
let
val ts' = take_until is_dict ts;
val c = const_of_idx idx;
val T = map_type_tvar (fn ((v, i), _) =>
Type_Infer.param typidx (v ^ string_of_int i, []))
(Sign.the_const_type thy c);
val typidx' = typidx + 1;
in of_apps bounds (Term.Const (c, T), ts') typidx' end
| of_univ bounds (BVar (n, ts)) typidx =
of_apps bounds (Bound (bounds - n - 1), ts) typidx
| of_univ bounds (t as Abs _) typidx =
typidx
|> of_univ (bounds + 1) (apps t [BVar (bounds, [])])
|-> (fn t' => pair (Term.Abs ("u", dummyT, t')))
in of_univ 0 t 0 |> fst end;
(* evaluation with type reconstruction *)
fun eval_term thy program (nbe_program, idx_tab) ((vs0, (vs, ty)), t) deps =
let
val ctxt = Syntax.init_pretty_global thy;
val string_of_term = Syntax.string_of_term (Config.put show_types true ctxt);
val ty' = typ_of_itype program vs0 ty;
fun type_infer t =
Syntax.check_term (Config.put Type_Infer_Context.const_sorts false ctxt)
(Type.constraint ty' t);
fun check_tvars t =
if null (Term.add_tvars t []) then t
else error ("Illegal schematic type variables in normalized term: " ^ string_of_term t);
in
compile_term thy nbe_program deps (vs, t)
|> term_of_univ thy program idx_tab
|> traced (fn t => "Normalized:\n" ^ string_of_term t)
|> type_infer
|> traced (fn t => "Types inferred:\n" ^ string_of_term t)
|> check_tvars
|> traced (fn _ => "---\n")
end;
(* function store *)
structure Nbe_Functions = Code_Data
(
type T = (Univ option * int) Graph.T * (int * string Inttab.table);
val empty = (Graph.empty, (0, Inttab.empty));
);
fun compile ignore_cache thy program =
let
val (nbe_program, (_, idx_tab)) =
Nbe_Functions.change (if ignore_cache then NONE else SOME thy)
(compile_program thy program);
in (nbe_program, idx_tab) end;
(* evaluation oracle *)
fun mk_equals thy lhs raw_rhs =
let
val ty = Thm.typ_of (Thm.ctyp_of_term lhs);
val eq = Thm.cterm_of thy (Term.Const ("==", ty --> ty --> propT));
val rhs = Thm.cterm_of thy raw_rhs;
in Thm.mk_binop eq lhs rhs end;
val (_, raw_oracle) = Context.>>> (Context.map_theory_result
(Thm.add_oracle (@{binding normalization_by_evaluation},
fn (thy, program, nbe_program_idx_tab, vsp_ty_t, deps, ct) =>
mk_equals thy ct (eval_term thy program nbe_program_idx_tab vsp_ty_t deps))));
fun oracle thy program nbe_program_idx_tab vsp_ty_t deps ct =
raw_oracle (thy, program, nbe_program_idx_tab, vsp_ty_t, deps, ct);
fun dynamic_conv thy = lift_triv_classes_conv thy (Code_Thingol.dynamic_conv thy
(K (fn program => oracle thy program (compile false thy program))));
fun dynamic_value thy = lift_triv_classes_rew thy
(Code_Thingol.dynamic_value thy I
(K (fn program => eval_term thy program (compile false thy program))));
fun static_conv thy consts =
lift_triv_classes_conv thy (Code_Thingol.static_conv thy consts
(K (fn program => fn _ => oracle thy program (compile true thy program))));
fun static_value thy consts = lift_triv_classes_rew thy
(Code_Thingol.static_value thy I consts
(K (fn program => fn _ => eval_term thy program (compile true thy program))));
(** setup **)
val setup = Value.add_evaluator ("nbe", dynamic_value o Proof_Context.theory_of);
end;