src/Tools/Code/code_runtime.ML
author haftmann
Mon Feb 06 20:56:36 2017 +0100 (2017-02-06)
changeset 64992 41e2c3617582
parent 64991 d2c79b16e133
child 64993 4fb84597ec5a
permissions -rw-r--r--
extended syntax allows to include datatype constructors directly in computations
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(*  Title:      Tools/Code/code_runtime.ML
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    Author:     Florian Haftmann, TU Muenchen
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Runtime services building on code generation into implementation language SML.
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*)
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signature CODE_RUNTIME =
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sig
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  val target: string
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  val value: Proof.context ->
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    (Proof.context -> unit -> 'a) * ((unit -> 'a) -> Proof.context -> Proof.context) * string ->
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    string * string -> 'a
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  type 'a cookie = (Proof.context -> unit -> 'a) * ((unit -> 'a) -> Proof.context -> Proof.context) * string
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  val dynamic_value: 'a cookie -> Proof.context -> string option
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    -> ((term -> term) -> 'a -> 'a) -> term -> string list -> 'a option
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  val dynamic_value_strict: 'a cookie -> Proof.context -> string option
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    -> ((term -> term) -> 'a -> 'a) -> term -> string list -> 'a
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  val dynamic_value_exn: 'a cookie -> Proof.context -> string option
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    -> ((term -> term) -> 'a -> 'a) -> term -> string list -> 'a Exn.result
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  val static_value: 'a cookie -> { ctxt: Proof.context, target: string option,
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    lift_postproc: (term -> term) -> 'a -> 'a, consts: string list }
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    -> Proof.context -> term -> 'a option
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  val static_value_strict: 'a cookie -> { ctxt: Proof.context, target: string option,
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    lift_postproc: (term -> term) -> 'a -> 'a, consts: string list }
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    -> Proof.context -> term -> 'a
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  val static_value_exn: 'a cookie -> { ctxt: Proof.context, target: string option,
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    lift_postproc: (term -> term) -> 'a -> 'a, consts: string list }
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    -> Proof.context -> term -> 'a Exn.result
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  val dynamic_holds_conv: Proof.context -> conv
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  val static_holds_conv: { ctxt: Proof.context, consts: string list } -> Proof.context -> conv
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  val code_reflect: (string * string list option) list -> string list -> string
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    -> string option -> theory -> theory
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  datatype truth = Holds
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  val put_truth: (unit -> truth) -> Proof.context -> Proof.context
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  val mount_computation: Proof.context -> (string * typ) list -> typ
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    -> (term -> 'ml) -> ((term -> term) -> 'ml option -> 'a) -> Proof.context -> term -> 'a
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  val mount_computation_conv: Proof.context -> (string * typ) list -> typ
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    -> (term -> 'ml) -> ('ml -> conv) -> Proof.context -> conv
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  val mount_computation_check: Proof.context -> (string * typ) list
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    -> (term -> truth) -> Proof.context -> conv
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  val polyml_as_definition: (binding * typ) list -> Path.T list -> theory -> theory
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  val trace: bool Config.T
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end;
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structure Code_Runtime : CODE_RUNTIME =
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struct
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open Basic_Code_Symbol;
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(** ML compiler as evaluation environment **)
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(* technical prerequisites *)
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val thisN = "Code_Runtime";
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val prefix_this = Long_Name.append thisN;
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val truthN = prefix_this "truth";
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val HoldsN = prefix_this "Holds";
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val target = "Eval";
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datatype truth = Holds;
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val _ = Theory.setup
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  (Code_Target.add_derived_target (target, [(Code_ML.target_SML, I)])
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  #> Code_Target.set_printings (Type_Constructor (@{type_name prop},
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    [(target, SOME (0, (K o K o K) (Code_Printer.str truthN)))]))
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  #> Code_Target.set_printings (Constant (@{const_name Code_Generator.holds},
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    [(target, SOME (Code_Printer.plain_const_syntax HoldsN))]))
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  #> Code_Target.add_reserved target thisN
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  #> fold (Code_Target.add_reserved target) ["oo", "ooo", "oooo", "upto", "downto", "orf", "andf"]);
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       (*avoid further pervasive infix names*)
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val trace = Attrib.setup_config_bool @{binding "code_runtime_trace"} (K false);
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fun compile_ML verbose code context =
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 (if Config.get_generic context trace then tracing code else ();
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  Code_Preproc.timed "compiling ML" Context.proof_of
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    (ML_Context.exec (fn () => ML_Compiler0.ML ML_Env.context
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    {line = 0, file = "generated code", verbose = verbose,
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       debug = false} code)) context);
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fun value ctxt (get, put, put_ml) (prelude, value) =
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  let
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    val code =
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      prelude ^ "\nval _ = Context.put_generic_context (SOME (Context.map_proof (" ^
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      put_ml ^ " (fn () => " ^ value ^ ")) (Context.the_generic_context ())))";
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    val ctxt' = ctxt
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      |> put (fn () => error ("Bad compilation for " ^ quote put_ml))
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      |> Context.proof_map (compile_ML false code);
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    val computator = get ctxt';
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  in Code_Preproc.timed_exec "running ML" computator ctxt' end;
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(* evaluation into ML language values *)
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type 'a cookie = (Proof.context -> unit -> 'a) * ((unit -> 'a) -> Proof.context -> Proof.context) * string;
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fun reject_vars ctxt t =
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  ((Sign.no_frees ctxt o Sign.no_vars ctxt o map_types (K dummyT)) t; t);
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fun build_compilation_text ctxt some_target program consts =
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  Code_Target.compilation_text ctxt (the_default target some_target) program consts false
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  #>> (fn ml_modules => space_implode "\n\n" (map snd ml_modules));
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fun run_compilation_text cookie ctxt comp vs_t args =
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  let
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    val (program_code, value_name) = comp vs_t;
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    val value_code = space_implode " "
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      (value_name :: "()" :: map (enclose "(" ")") args);
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  in Exn.interruptible_capture (value ctxt cookie) (program_code, value_code) end;
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fun partiality_as_none e = SOME (Exn.release e)
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  handle General.Match => NONE
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    | General.Bind => NONE
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    | General.Fail _ => NONE;
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fun dynamic_value_exn cookie ctxt some_target postproc t args =
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  let
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    val _ = reject_vars ctxt t;
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    val _ = if Config.get ctxt trace
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      then tracing ("Evaluation of term " ^ quote (Syntax.string_of_term ctxt t))
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      else ()
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    fun comp program _ vs_ty_t deps =
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      run_compilation_text cookie ctxt (build_compilation_text ctxt some_target program deps) vs_ty_t args;
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  in Code_Thingol.dynamic_value ctxt (Exn.map_res o postproc) comp t end;
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fun dynamic_value_strict cookie ctxt some_target postproc t args =
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  Exn.release (dynamic_value_exn cookie ctxt some_target postproc t args);
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fun dynamic_value cookie ctxt some_target postproc t args =
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  partiality_as_none (dynamic_value_exn cookie ctxt some_target postproc t args);
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fun static_value_exn cookie { ctxt, target, lift_postproc, consts } =
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  let
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    fun compilation' { program, deps } =
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      let
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        val compilation'' = run_compilation_text cookie ctxt
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          (build_compilation_text ctxt target program (map Constant deps));
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      in fn _ => fn _ => fn vs_ty_t => fn _ => compilation'' vs_ty_t [] end;
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    val compilation = Code_Thingol.static_value { ctxt = ctxt,
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      lift_postproc = Exn.map_res o lift_postproc, consts = consts }
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      compilation';
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  in fn ctxt' => compilation ctxt' o reject_vars ctxt' end;
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fun static_value_strict cookie x = Exn.release oo static_value_exn cookie x;
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fun static_value cookie x = partiality_as_none oo static_value_exn cookie x;
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(* evaluation for truth or nothing *)
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structure Truth_Result = Proof_Data
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(
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  type T = unit -> truth;
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  val empty: T = fn () => raise Fail "Truth_Result";
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  fun init _ = empty;
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);
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val put_truth = Truth_Result.put;
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val truth_cookie = (Truth_Result.get, put_truth, prefix_this "put_truth");
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local
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val reject_vars = fn ctxt => tap (reject_vars ctxt o Thm.term_of);
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fun check_holds ctxt evaluator vs_t ct =
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  let
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    val t = Thm.term_of ct;
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    val _ = if fastype_of t <> propT
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      then error ("Not a proposition: " ^ Syntax.string_of_term ctxt t)
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      else ();
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    val iff = Thm.cterm_of ctxt (Term.Const (@{const_name Pure.eq}, propT --> propT --> propT));
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    val result = case partiality_as_none (run_compilation_text truth_cookie ctxt evaluator vs_t [])
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     of SOME Holds => true
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      | _ => false;
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  in
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    Thm.mk_binop iff ct (if result then @{cprop "PROP Code_Generator.holds"} else ct)
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  end;
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val (_, raw_check_holds_oracle) = Context.>>> (Context.map_theory_result
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  (Thm.add_oracle (@{binding holds_by_evaluation},
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  fn (ctxt, evaluator, vs_t, ct) => check_holds ctxt evaluator vs_t ct)));
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fun check_holds_oracle ctxt evaluator vs_ty_t ct =
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  raw_check_holds_oracle (ctxt, evaluator, vs_ty_t, ct);
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in
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fun dynamic_holds_conv ctxt = Code_Thingol.dynamic_conv ctxt
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  (fn program => fn vs_t => fn deps =>
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    check_holds_oracle ctxt (build_compilation_text ctxt NONE program deps) vs_t)
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      o reject_vars ctxt;
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fun static_holds_conv (ctxt_consts as { ctxt, ... }) =
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  Code_Thingol.static_conv_thingol ctxt_consts (fn { program, deps } => fn ctxt' => fn vs_t =>
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    K (check_holds_oracle ctxt' (build_compilation_text ctxt NONE program (map Constant deps)) vs_t o reject_vars ctxt'));
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end; (*local*)
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(** generator for computations -- partial implementations of the universal morphism from Isabelle to ML terms **)
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(* auxiliary *)
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val generated_computationN = "Generated_Computation";
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(* possible type signatures of constants *)
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fun typ_signatures' T =
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  let
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    val (Ts, T') = strip_type T;
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  in map_range (fn n => (drop n Ts ---> T', take n Ts)) (length Ts + 1) end;
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fun typ_signatures cTs =
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  let
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    fun add (c, T) =
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      fold (fn (T, Ts) => Typtab.map_default (T, []) (cons (c, Ts)))
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        (typ_signatures' T);
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  in
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    Typtab.empty
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    |> fold add cTs
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    |> Typtab.lookup_list
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  end;
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(* name mangling *)
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local
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fun tycos_of (Type (tyco, Ts)) = maps tycos_of Ts @ [tyco]
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  | tycos_of _ = [];
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val ml_name_of = Name.desymbolize NONE o Long_Name.base_name;
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in
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val covered_constsN = "covered_consts";
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fun of_term_for_typ Ts =
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  let
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    val names = Ts
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      |> map (suffix "_of_term" o space_implode "_" o map ml_name_of o tycos_of)
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      |> Name.variant_list [];
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  in the o AList.lookup (op =) (Ts ~~ names) end;
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fun eval_for_const ctxt cTs =
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  let
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    fun symbol_list (c, T) = c :: maps tycos_of (Sign.const_typargs (Proof_Context.theory_of ctxt) (c, T))
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    val names = cTs
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      |> map (prefix "eval_" o space_implode "_" o map ml_name_of o symbol_list)
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      |> Name.variant_list [];
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  in the o AList.lookup (op =) (cTs ~~ names) end;
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end;
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(* checks for input terms *)
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fun monomorphic T = fold_atyps ((K o K) false) T true;
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fun check_typ ctxt T t =
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  Syntax.check_term ctxt (Type.constraint T t);
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fun check_computation_input ctxt cTs t =
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  let
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    fun check t = check_comb (strip_comb t)
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    and check_comb (t as Abs _, _) =
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          error ("Bad term, contains abstraction: " ^ Syntax.string_of_term ctxt t)
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      | check_comb (t as Const (cT as (c, T)), ts) =
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          let
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            val _ = if not (member (op =) cTs cT)
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              then error ("Bad term, computation cannot proceed on constant " ^ Syntax.string_of_term ctxt t)
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              else ();
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            val _ = if not (monomorphic T)
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              then error ("Bad term, contains polymorphic constant " ^ Syntax.string_of_term ctxt t)
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              else ();
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            val _ = map check ts;
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          in () end;
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    val _ = check t;
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  in t end;
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(* code generation for of the universal morphism *)
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val print_const = ML_Syntax.print_pair ML_Syntax.print_string ML_Syntax.print_typ;
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fun print_of_term_funs { typ_signatures_for, eval_for_const, of_term_for_typ } Ts =
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  let
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    val var_names = map_range (fn n => "t" ^ string_of_int (n + 1));
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    fun print_lhs c xs = "Const (" ^ quote c ^ ", _)"
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      |> fold (fn x => fn s => s ^ " $ " ^ x) xs
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      |> enclose "(" ")";
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    fun print_rhs c Ts T xs = eval_for_const (c, Ts ---> T)
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      |> fold2 (fn T' => fn x => fn s =>
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         s ^ (" (" ^ of_term_for_typ T' ^ " " ^ x ^ ")")) Ts xs
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    fun print_eq T (c, Ts) =
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      let
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        val xs = var_names (length Ts);
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      in print_lhs c xs ^ " = " ^ print_rhs c Ts T xs end;
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    fun print_eqs T =
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      let
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        val typ_signs = typ_signatures_for T;
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        val name = of_term_for_typ T;
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      in
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        map (print_eq T) typ_signs
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        |> map (prefix (name ^ " "))
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        |> space_implode "\n  | "
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      end;
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  in
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    map print_eqs Ts
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    |> space_implode "\nand "
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    |> prefix "fun "
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  end;
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fun print_computation_code ctxt compiled_value [] requested_Ts =
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      if null requested_Ts then ("", [])
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      else error ("No equation available for requested type "
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        ^ Syntax.string_of_typ ctxt (hd requested_Ts))
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  | print_computation_code ctxt compiled_value cTs requested_Ts =
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      let
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        val proper_cTs = map_filter I cTs;
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        val typ_signatures_for = typ_signatures proper_cTs;
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        fun add_typ T Ts =
haftmann@64959
   324
          if member (op =) Ts T
haftmann@64959
   325
          then Ts
haftmann@64990
   326
          else case typ_signatures_for T of
haftmann@64990
   327
            [] => error ("No equation available for requested type "
haftmann@64990
   328
              ^ Syntax.string_of_typ ctxt T)
haftmann@64990
   329
          | typ_signs =>
haftmann@64990
   330
              Ts
haftmann@64990
   331
              |> cons T
haftmann@64990
   332
              |> fold (fold add_typ o snd) typ_signs;
haftmann@64959
   333
        val required_Ts = fold add_typ requested_Ts [];
haftmann@64959
   334
        val of_term_for_typ' = of_term_for_typ required_Ts;
haftmann@64959
   335
        val eval_for_const' = eval_for_const ctxt proper_cTs;
haftmann@64959
   336
        val eval_for_const'' = the_default "_" o Option.map eval_for_const';
haftmann@64959
   337
        val eval_tuple = enclose "(" ")" (commas (map eval_for_const' proper_cTs));
haftmann@64959
   338
        fun mk_abs s = "fn " ^ s ^ " => ";
haftmann@64959
   339
        val eval_abs = space_implode ""
haftmann@64959
   340
          (map (mk_abs o eval_for_const'') cTs);
haftmann@64959
   341
        val of_term_code = print_of_term_funs {
haftmann@64990
   342
          typ_signatures_for = typ_signatures_for,
haftmann@64959
   343
          eval_for_const = eval_for_const',
haftmann@64959
   344
          of_term_for_typ = of_term_for_typ' } required_Ts;
haftmann@64959
   345
        val of_term_names = map (Long_Name.append generated_computationN
haftmann@64959
   346
          o of_term_for_typ') requested_Ts;
haftmann@64959
   347
      in
haftmann@64959
   348
        cat_lines [
haftmann@64959
   349
          "structure " ^ generated_computationN ^ " =",
haftmann@64959
   350
          "struct",
haftmann@64959
   351
          "",
haftmann@64959
   352
          "val " ^ covered_constsN ^ " = " ^ ML_Syntax.print_list print_const proper_cTs ^ ";",
haftmann@64959
   353
          "",
haftmann@64959
   354
          "val " ^ eval_tuple ^ " = " ^ compiled_value ^ " ()",
haftmann@64959
   355
          "  (" ^ eval_abs,
haftmann@64959
   356
          "    " ^ eval_tuple ^ ");",
haftmann@64959
   357
          "",
haftmann@64959
   358
          of_term_code,
haftmann@64959
   359
          "",
haftmann@64959
   360
          "end"
haftmann@64959
   361
        ] |> rpair of_term_names
haftmann@64959
   362
      end;
haftmann@64940
   363
haftmann@64991
   364
fun prechecked_computation T raw_computation ctxt =
haftmann@64987
   365
  check_typ ctxt T
haftmann@64987
   366
  #> reject_vars ctxt
haftmann@64991
   367
  #> raw_computation ctxt;
haftmann@64991
   368
haftmann@64991
   369
fun prechecked_conv T raw_conv ctxt =
haftmann@64991
   370
  tap (check_typ ctxt T o reject_vars ctxt o Thm.term_of)
haftmann@64991
   371
  #> raw_conv ctxt;
haftmann@64991
   372
haftmann@64991
   373
fun checked_computation cTs raw_computation ctxt =
haftmann@64991
   374
  check_computation_input ctxt cTs
haftmann@64988
   375
  #> Exn.capture raw_computation
haftmann@64988
   376
  #> partiality_as_none;
haftmann@64987
   377
haftmann@64957
   378
fun mount_computation ctxt cTs T raw_computation lift_postproc =
haftmann@64991
   379
  prechecked_computation T (Code_Preproc.static_value
haftmann@64991
   380
    { ctxt = ctxt, lift_postproc = lift_postproc, consts = [] }
haftmann@64991
   381
    (K (checked_computation cTs raw_computation)));
haftmann@64943
   382
haftmann@64989
   383
fun mount_computation_conv ctxt cTs T raw_computation conv =
haftmann@64991
   384
  prechecked_conv T (Code_Preproc.static_conv
haftmann@64991
   385
    { ctxt = ctxt, consts = [] }
haftmann@64989
   386
    (K (fn ctxt' => fn t =>
haftmann@64991
   387
      case checked_computation cTs raw_computation ctxt' t of
haftmann@64989
   388
        SOME x => conv x
haftmann@64991
   389
      | NONE => Conv.all_conv)));
haftmann@64989
   390
haftmann@64989
   391
local
haftmann@64989
   392
haftmann@64989
   393
fun holds ct = Thm.mk_binop @{cterm "Pure.eq :: prop \<Rightarrow> prop \<Rightarrow> prop"}
haftmann@64989
   394
  ct @{cprop "PROP Code_Generator.holds"};
haftmann@64989
   395
haftmann@64989
   396
val (_, holds_oracle) = Context.>>> (Context.map_theory_result
haftmann@64989
   397
  (Thm.add_oracle (@{binding holds}, holds)));
haftmann@64989
   398
haftmann@64989
   399
in
haftmann@64989
   400
haftmann@64989
   401
fun mount_computation_check ctxt cTs raw_computation =
haftmann@64989
   402
  mount_computation_conv ctxt cTs @{typ prop} raw_computation
haftmann@64989
   403
    (K holds_oracle);
haftmann@64989
   404
haftmann@64989
   405
end;
haftmann@64989
   406
haftmann@64959
   407
haftmann@64959
   408
(** variants of universal runtime code generation **)
haftmann@64940
   409
haftmann@64959
   410
(*FIXME consolidate variants*)
haftmann@64940
   411
haftmann@64959
   412
fun runtime_code'' ctxt module_name program tycos consts =
haftmann@33992
   413
  let
haftmann@55757
   414
    val thy = Proof_Context.theory_of ctxt;
haftmann@48568
   415
    val (ml_modules, target_names) =
haftmann@55757
   416
      Code_Target.produce_code_for ctxt
haftmann@55683
   417
        target NONE module_name [] program false (map Constant consts @ map Type_Constructor tycos);
haftmann@48568
   418
    val ml_code = space_implode "\n\n" (map snd ml_modules);
haftmann@55147
   419
    val (consts', tycos') = chop (length consts) target_names;
wenzelm@42359
   420
    val consts_map = map2 (fn const =>
wenzelm@42359
   421
      fn NONE =>
wenzelm@42359
   422
          error ("Constant " ^ (quote o Code.string_of_const thy) const ^
wenzelm@42359
   423
            "\nhas a user-defined serialization")
haftmann@55147
   424
       | SOME const' => (const, const')) consts consts'
wenzelm@42359
   425
    val tycos_map = map2 (fn tyco =>
wenzelm@42359
   426
      fn NONE =>
wenzelm@55304
   427
          error ("Type " ^ quote (Proof_Context.markup_type ctxt tyco) ^
wenzelm@42359
   428
            "\nhas a user-defined serialization")
haftmann@55147
   429
        | SOME tyco' => (tyco, tyco')) tycos tycos';
haftmann@34028
   430
  in (ml_code, (tycos_map, consts_map)) end;
haftmann@28054
   431
haftmann@64959
   432
fun runtime_code' ctxt some_module_name named_tycos named_consts computation_Ts program evals vs_ty_evals deps =
haftmann@64959
   433
  let
haftmann@64959
   434
    val thy = Proof_Context.theory_of ctxt;
haftmann@64959
   435
    fun the_const (Const cT) = cT
haftmann@64959
   436
      | the_const t = error ("No constant after preprocessing: " ^ Syntax.string_of_term ctxt t)
haftmann@64959
   437
    val raw_computation_cTs = case evals of
haftmann@64959
   438
        Abs (_, _, t) => (map the_const o snd o strip_comb) t
haftmann@64959
   439
      | _ => error ("Bad term after preprocessing: " ^ Syntax.string_of_term ctxt evals);
haftmann@64959
   440
    val computation_cTs = fold_rev (fn cT => fn cTs =>
haftmann@64959
   441
      (if member (op =) cTs (SOME cT) then NONE else SOME cT) :: cTs) raw_computation_cTs [];
haftmann@64959
   442
    val consts' = fold (fn NONE => I | SOME (c, _) => insert (op =) c)
haftmann@64959
   443
      computation_cTs named_consts;
haftmann@64959
   444
    val program' = Code_Thingol.consts_program ctxt consts';
haftmann@64959
   445
      (*FIXME insufficient interfaces require double invocation of code generator*)
haftmann@64959
   446
    val ((ml_modules, compiled_value), deresolve) =
haftmann@64959
   447
      Code_Target.compilation_text' ctxt target some_module_name program'
haftmann@64959
   448
        (map Code_Symbol.Type_Constructor named_tycos @ map Code_Symbol.Constant consts' @ deps) true vs_ty_evals;
haftmann@64959
   449
        (*FIXME constrain signature*)
haftmann@64959
   450
    fun deresolve_const c = case (deresolve o Code_Symbol.Constant) c of
haftmann@64959
   451
          NONE => error ("Constant " ^ (quote o Code.string_of_const thy) c ^
haftmann@64959
   452
            "\nhas a user-defined serialization")
haftmann@64959
   453
        | SOME c' => c';
haftmann@64959
   454
    fun deresolve_tyco tyco = case (deresolve o Code_Symbol.Type_Constructor) tyco of
haftmann@64959
   455
          NONE => error ("Type " ^ quote (Proof_Context.markup_type ctxt tyco) ^
haftmann@64959
   456
            "\nhas a user-defined serialization")
haftmann@64959
   457
        | SOME c' => c';
haftmann@64959
   458
    val tyco_names =  map deresolve_const named_tycos;
haftmann@64959
   459
    val const_names = map deresolve_const named_consts;
haftmann@64959
   460
    val generated_code = space_implode "\n\n" (map snd ml_modules);
haftmann@64959
   461
    val (of_term_code, of_term_names) =
haftmann@64959
   462
      print_computation_code ctxt compiled_value computation_cTs computation_Ts;
haftmann@64959
   463
    val compiled_computation = generated_code ^ "\n" ^ of_term_code;
haftmann@64959
   464
  in
haftmann@64959
   465
    compiled_computation
haftmann@64959
   466
    |> rpair { tyco_map = named_tycos ~~ tyco_names,
haftmann@64959
   467
      const_map = named_consts ~~ const_names,
haftmann@64959
   468
      of_term_map = computation_Ts ~~ of_term_names }
haftmann@64959
   469
  end;
haftmann@64959
   470
haftmann@64959
   471
fun funs_of_maps { tyco_map, const_map, of_term_map } =
haftmann@64959
   472
  { name_for_tyco = the o AList.lookup (op =) tyco_map,
haftmann@64959
   473
    name_for_const = the o AList.lookup (op =) const_map,
haftmann@64959
   474
    of_term_for_typ = the o AList.lookup (op =) of_term_map };
haftmann@64959
   475
haftmann@64959
   476
fun runtime_code ctxt some_module_name named_tycos named_consts computation_Ts program evals vs_ty_evals deps =
haftmann@64959
   477
  runtime_code' ctxt some_module_name named_tycos named_consts computation_Ts program evals vs_ty_evals deps
haftmann@64959
   478
  ||> funs_of_maps;
haftmann@64959
   479
haftmann@64959
   480
haftmann@64959
   481
(** code and computation antiquotations **)
haftmann@64959
   482
haftmann@64989
   483
local
haftmann@64959
   484
haftmann@64989
   485
val mount_computationN = prefix_this "mount_computation";
haftmann@64989
   486
val mount_computation_convN = prefix_this "mount_computation_conv";
haftmann@64989
   487
val mount_computation_checkN = prefix_this "mount_computation_check";
haftmann@28054
   488
haftmann@38930
   489
structure Code_Antiq_Data = Proof_Data
haftmann@28054
   490
(
haftmann@64955
   491
  type T = { named_consts: string list,
haftmann@64959
   492
    computation_Ts: typ list, computation_cTs: (string * typ) list,
haftmann@64959
   493
    position_index: int,
haftmann@64959
   494
    generated_code: (string * {
haftmann@64959
   495
      name_for_tyco: string -> string,
haftmann@64959
   496
      name_for_const: string -> string,
haftmann@64959
   497
      of_term_for_typ: typ -> string
haftmann@64959
   498
    }) lazy
haftmann@64955
   499
  };
haftmann@64955
   500
  val empty: T = { named_consts = [],
haftmann@64959
   501
    computation_Ts = [], computation_cTs = [],
haftmann@64959
   502
    position_index = 0,
haftmann@64959
   503
    generated_code = Lazy.lazy (fn () => raise Fail "empty")
haftmann@64955
   504
  };
wenzelm@59150
   505
  fun init _ = empty;
haftmann@28054
   506
);
haftmann@28054
   507
haftmann@64959
   508
val current_position_index = #position_index o Code_Antiq_Data.get;
haftmann@64955
   509
haftmann@64959
   510
fun register { named_consts, computation_Ts, computation_cTs } ctxt =
haftmann@64955
   511
  let
haftmann@64959
   512
    val data = Code_Antiq_Data.get ctxt;
haftmann@64959
   513
    val named_consts' = union (op =) named_consts (#named_consts data);
haftmann@64959
   514
    val computation_Ts' = union (op =) computation_Ts (#computation_Ts data);
haftmann@64959
   515
    val computation_cTs' = union (op =) computation_cTs (#computation_cTs data);
haftmann@64959
   516
    val position_index' = #position_index data + 1;
haftmann@64959
   517
    fun generated_code' () =
haftmann@64959
   518
      let
haftmann@64959
   519
        val evals = Abs ("eval", map snd computation_cTs' --->
haftmann@64959
   520
          TFree (Name.aT, []), list_comb (Bound 0, map Const computation_cTs'));
haftmann@64959
   521
      in Code_Thingol.dynamic_value ctxt
haftmann@64959
   522
        (K I) (runtime_code ctxt NONE [] named_consts' computation_Ts') evals
haftmann@64959
   523
      end;
haftmann@64955
   524
  in
haftmann@64955
   525
    ctxt
haftmann@64955
   526
    |> Code_Antiq_Data.put { 
haftmann@64959
   527
        named_consts = named_consts',
haftmann@64959
   528
        computation_Ts = computation_Ts',
haftmann@64959
   529
        computation_cTs = computation_cTs',
haftmann@64959
   530
        position_index = position_index',
haftmann@64959
   531
        generated_code = Lazy.lazy generated_code'
haftmann@64955
   532
      }
haftmann@64955
   533
  end;
haftmann@30962
   534
haftmann@64959
   535
fun register_const const =
haftmann@64959
   536
  register { named_consts = [const],
haftmann@64959
   537
    computation_Ts = [],
haftmann@64959
   538
    computation_cTs = [] };
haftmann@64959
   539
haftmann@64959
   540
fun register_computation cTs T =
haftmann@64959
   541
  register { named_consts = [],
haftmann@64959
   542
    computation_Ts = [T],
haftmann@64959
   543
    computation_cTs = cTs };
haftmann@64959
   544
haftmann@64959
   545
fun print body_code_for ctxt ctxt' =
haftmann@30962
   546
  let
haftmann@64959
   547
    val position_index = current_position_index ctxt;
haftmann@64959
   548
    val (code, name_ofs) = (Lazy.force o #generated_code o Code_Antiq_Data.get) ctxt';
haftmann@64959
   549
    val context_code = if position_index = 0 then code else "";
haftmann@64989
   550
    val body_code = body_code_for name_ofs (ML_Context.struct_name ctxt');
haftmann@64958
   551
  in (context_code, body_code) end;
haftmann@28054
   552
haftmann@64959
   553
fun print_code ctxt const =
haftmann@64989
   554
  print (fn { name_for_const, ... } => fn prfx =>
haftmann@64959
   555
    Long_Name.append prfx (name_for_const const)) ctxt;
haftmann@64959
   556
haftmann@64989
   557
fun print_computation kind ctxt T =
haftmann@64989
   558
  print (fn { of_term_for_typ, ... } => fn prfx =>
haftmann@64959
   559
    space_implode " " [
haftmann@64989
   560
      kind,
haftmann@64959
   561
      "(Context.proof_of (Context.the_generic_context ()))",
haftmann@64959
   562
      Long_Name.implode [prfx, generated_computationN, covered_constsN],
haftmann@64959
   563
      (ML_Syntax.atomic o ML_Syntax.print_typ) T,
haftmann@64959
   564
      Long_Name.append prfx (of_term_for_typ T)
haftmann@64959
   565
    ]) ctxt;
haftmann@64959
   566
haftmann@64989
   567
fun print_computation_check ctxt =
haftmann@64989
   568
  print (fn { of_term_for_typ, ... } => fn prfx =>
haftmann@64989
   569
    space_implode " " [
haftmann@64989
   570
      mount_computation_checkN,
haftmann@64989
   571
      "(Context.proof_of (Context.the_generic_context ()))",
haftmann@64989
   572
      Long_Name.implode [prfx, generated_computationN, covered_constsN],
haftmann@64989
   573
      Long_Name.append prfx (of_term_for_typ @{typ prop})
haftmann@64989
   574
    ]) ctxt;
haftmann@64989
   575
haftmann@64992
   576
haftmann@64992
   577
fun add_all_constrs ctxt (dT as Type (tyco, Ts)) =
haftmann@64992
   578
  let
haftmann@64992
   579
    val ((vs, constrs), _) = Code.get_type (Proof_Context.theory_of ctxt) tyco;
haftmann@64992
   580
    val subst_TFree = the o AList.lookup (op =) (map fst vs ~~ Ts);
haftmann@64992
   581
    val cs = map (fn (c, (_, Ts')) =>
haftmann@64992
   582
      (c, (map o map_atyps) (fn TFree (v, _) => subst_TFree v) Ts'
haftmann@64992
   583
        ---> dT)) constrs;
haftmann@64992
   584
  in
haftmann@64992
   585
    union (op =) cs
haftmann@64992
   586
    #> fold (add_all_constrs ctxt) Ts
haftmann@64992
   587
  end;
haftmann@64992
   588
haftmann@64992
   589
fun prep_spec ctxt (raw_ts, raw_dTs) =
haftmann@64989
   590
  let
haftmann@64989
   591
    val ts = map (Syntax.check_term ctxt) raw_ts;
haftmann@64992
   592
    val dTs = map (Syntax.check_typ ctxt) raw_dTs;
haftmann@64989
   593
  in
haftmann@64992
   594
    []
haftmann@64992
   595
    |> (fold o fold_aterms)
haftmann@64989
   596
      (fn (t as Const (cT as (_, T))) =>
haftmann@64989
   597
        if not (monomorphic T) then error ("Polymorphic constant: " ^ Syntax.string_of_term ctxt t)
haftmann@64992
   598
        else insert (op =) cT | _ => I) ts
haftmann@64992
   599
    |> fold (fn dT =>
haftmann@64992
   600
        if not (monomorphic dT) then error ("Polymorphic datatype: " ^ Syntax.string_of_typ ctxt dT)
haftmann@64992
   601
        else add_all_constrs ctxt dT) dTs
haftmann@64989
   602
  end;
haftmann@64989
   603
haftmann@28054
   604
in
haftmann@28054
   605
wenzelm@56069
   606
fun ml_code_antiq raw_const ctxt =
haftmann@28054
   607
  let
wenzelm@53169
   608
    val thy = Proof_Context.theory_of ctxt;
wenzelm@53169
   609
    val const = Code.check_const thy raw_const;
haftmann@64959
   610
  in (print_code ctxt const, register_const const ctxt) end;
haftmann@64959
   611
haftmann@64992
   612
fun gen_ml_computation_antiq kind (raw_T, raw_spec) ctxt =
haftmann@64959
   613
  let
haftmann@64992
   614
    val cTs = prep_spec ctxt raw_spec;
haftmann@64959
   615
    val T = Syntax.check_typ ctxt raw_T;
haftmann@64959
   616
    val _ = if not (monomorphic T)
haftmann@64959
   617
      then error ("Polymorphic type: " ^ Syntax.string_of_typ ctxt T)
haftmann@64959
   618
      else ();
haftmann@64989
   619
  in (print_computation kind ctxt T, register_computation cTs T ctxt) end;
haftmann@64989
   620
haftmann@64989
   621
val ml_computation_antiq = gen_ml_computation_antiq mount_computationN;
haftmann@64989
   622
haftmann@64989
   623
val ml_computation_conv_antiq = gen_ml_computation_antiq mount_computation_convN;
haftmann@64989
   624
haftmann@64992
   625
fun ml_computation_check_antiq raw_spec ctxt =
haftmann@64989
   626
  let
haftmann@64992
   627
    val cTs = insert (op =) (dest_Const @{const holds}) (prep_spec ctxt raw_spec);
haftmann@64989
   628
  in (print_computation_check ctxt, register_computation cTs @{typ prop} ctxt) end;
haftmann@30962
   629
haftmann@28054
   630
end; (*local*)
haftmann@28054
   631
haftmann@28054
   632
haftmann@58558
   633
(** reflection support **)
haftmann@36470
   634
haftmann@40421
   635
fun check_datatype thy tyco some_consts =
haftmann@36470
   636
  let
haftmann@63174
   637
    val declared_constrs = (map fst o snd o fst o Code.get_type thy) tyco;
haftmann@63174
   638
    val constrs = case some_consts
haftmann@63174
   639
     of SOME [] => []
haftmann@63174
   640
      | SOME consts =>
haftmann@40421
   641
          let
haftmann@63174
   642
            val missing_constrs = subtract (op =) consts declared_constrs;
haftmann@40421
   643
            val _ = if null missing_constrs then []
wenzelm@45430
   644
              else error ("Missing constructor(s) " ^ commas_quote missing_constrs
haftmann@40421
   645
                ^ " for datatype " ^ quote tyco);
haftmann@63174
   646
            val false_constrs = subtract (op =) declared_constrs consts;
haftmann@40421
   647
            val _ = if null false_constrs then []
wenzelm@45430
   648
              else error ("Non-constructor(s) " ^ commas_quote false_constrs
haftmann@40421
   649
                ^ " for datatype " ^ quote tyco)
haftmann@63174
   650
          in consts end
haftmann@63174
   651
      | NONE => declared_constrs;
haftmann@40421
   652
  in (tyco, constrs) end;
haftmann@36470
   653
haftmann@36470
   654
fun add_eval_tyco (tyco, tyco') thy =
haftmann@36470
   655
  let
haftmann@36470
   656
    val k = Sign.arity_number thy tyco;
haftmann@40421
   657
    fun pr pr' _ [] = tyco'
haftmann@40421
   658
      | pr pr' _ [ty] =
haftmann@36470
   659
          Code_Printer.concat [pr' Code_Printer.BR ty, tyco']
haftmann@40421
   660
      | pr pr' _ tys =
haftmann@36470
   661
          Code_Printer.concat [Code_Printer.enum "," "(" ")" (map (pr' Code_Printer.BR) tys), tyco']
haftmann@36470
   662
  in
haftmann@36470
   663
    thy
haftmann@55150
   664
    |> Code_Target.set_printings (Type_Constructor (tyco, [(target, SOME (k, pr))]))
haftmann@36470
   665
  end;
haftmann@36470
   666
haftmann@36514
   667
fun add_eval_constr (const, const') thy =
haftmann@36514
   668
  let
haftmann@36514
   669
    val k = Code.args_number thy const;
haftmann@36514
   670
    fun pr pr' fxy ts = Code_Printer.brackify fxy
haftmann@38922
   671
      (const' :: the_list (Code_Printer.tuplify pr' Code_Printer.BR (map fst ts)));
haftmann@36514
   672
  in
haftmann@36514
   673
    thy
haftmann@55150
   674
    |> Code_Target.set_printings (Constant (const,
haftmann@52435
   675
      [(target, SOME (Code_Printer.simple_const_syntax (k, pr)))]))
haftmann@36514
   676
  end;
haftmann@36514
   677
haftmann@55150
   678
fun add_eval_const (const, const') = Code_Target.set_printings (Constant
haftmann@52435
   679
  (const, [(target, SOME (Code_Printer.simple_const_syntax (0, (K o K o K) const')))]));
haftmann@36470
   680
haftmann@39912
   681
fun process_reflection (code, (tyco_map, (constr_map, const_map))) module_name NONE thy =
haftmann@38935
   682
      thy
haftmann@38935
   683
      |> Code_Target.add_reserved target module_name
haftmann@63163
   684
      |> Context.theory_map (compile_ML true code)
haftmann@38935
   685
      |> fold (add_eval_tyco o apsnd Code_Printer.str) tyco_map
haftmann@38935
   686
      |> fold (add_eval_constr o apsnd Code_Printer.str) constr_map
haftmann@38935
   687
      |> fold (add_eval_const o apsnd Code_Printer.str) const_map
haftmann@39912
   688
  | process_reflection (code, _) _ (SOME file_name) thy =
haftmann@36470
   689
      let
wenzelm@37950
   690
        val preamble =
wenzelm@46737
   691
          "(* Generated from " ^
wenzelm@56208
   692
            Path.implode (Resources.thy_path (Path.basic (Context.theory_name thy))) ^
wenzelm@46737
   693
          "; DO NOT EDIT! *)";
haftmann@39912
   694
        val _ = File.write (Path.explode file_name) (preamble ^ "\n\n" ^ code);
haftmann@36470
   695
      in
haftmann@36470
   696
        thy
haftmann@36470
   697
      end;
haftmann@36470
   698
haftmann@36470
   699
fun gen_code_reflect prep_type prep_const raw_datatypes raw_functions module_name some_file thy  =
haftmann@36470
   700
  let
haftmann@55757
   701
    val ctxt = Proof_Context.init_global thy;
haftmann@36470
   702
    val datatypes = map (fn (raw_tyco, raw_cos) =>
haftmann@55757
   703
      (prep_type ctxt raw_tyco, (Option.map o map) (prep_const thy) raw_cos)) raw_datatypes;
haftmann@40421
   704
    val (tycos, constrs) = map_split (uncurry (check_datatype thy)) datatypes
haftmann@40421
   705
      |> apsnd flat;
haftmann@36470
   706
    val functions = map (prep_const thy) raw_functions;
haftmann@58557
   707
    val consts = constrs @ functions;
haftmann@63159
   708
    val program = Code_Thingol.consts_program ctxt consts;
haftmann@64959
   709
    val result = runtime_code'' ctxt module_name program tycos consts
haftmann@36514
   710
      |> (apsnd o apsnd) (chop (length constrs));
haftmann@36470
   711
  in
haftmann@36470
   712
    thy
haftmann@39485
   713
    |> process_reflection result module_name some_file
haftmann@36470
   714
  end;
haftmann@36470
   715
haftmann@39422
   716
val code_reflect = gen_code_reflect Code_Target.cert_tyco (K I);
haftmann@36470
   717
val code_reflect_cmd = gen_code_reflect Code_Target.read_tyco Code.read_const;
haftmann@36470
   718
haftmann@36470
   719
haftmann@28054
   720
(** Isar setup **)
haftmann@28054
   721
haftmann@64992
   722
local
haftmann@64992
   723
haftmann@64992
   724
val parse_consts_spec =
haftmann@64992
   725
  Scan.optional (Scan.lift (Args.$$$ "terms" -- Args.colon) |-- Scan.repeat1 Args.term) []
haftmann@64992
   726
  -- Scan.optional (Scan.lift (Args.$$$ "datatypes"  -- Args.colon) |-- Scan.repeat1 Args.typ) [];
haftmann@64992
   727
haftmann@64992
   728
in
haftmann@64992
   729
wenzelm@56069
   730
val _ =
haftmann@64959
   731
  Theory.setup (ML_Antiquotation.declaration @{binding code}
haftmann@64959
   732
    Args.term (fn _ => ml_code_antiq));
haftmann@64959
   733
haftmann@64959
   734
val _ =
haftmann@64959
   735
  Theory.setup (ML_Antiquotation.declaration @{binding computation}
haftmann@64992
   736
    (Args.typ -- parse_consts_spec)
haftmann@64987
   737
       (fn _ => ml_computation_antiq));
haftmann@28054
   738
haftmann@64989
   739
val _ =
haftmann@64989
   740
  Theory.setup (ML_Antiquotation.declaration @{binding computation_conv}
haftmann@64992
   741
    (Args.typ -- parse_consts_spec)
haftmann@64989
   742
       (fn _ => ml_computation_conv_antiq));
haftmann@64989
   743
haftmann@64989
   744
val _ =
haftmann@64989
   745
  Theory.setup (ML_Antiquotation.declaration @{binding computation_check}
haftmann@64992
   746
    parse_consts_spec 
haftmann@64989
   747
       (fn _ => ml_computation_check_antiq));
haftmann@64989
   748
haftmann@64992
   749
end;
haftmann@64992
   750
haftmann@36470
   751
local
haftmann@36470
   752
wenzelm@36960
   753
val parse_datatype =
haftmann@63174
   754
  Parse.name -- Scan.optional (@{keyword "="} |--
haftmann@40711
   755
    (((Parse.sym_ident || Parse.string) >> (fn "_" => NONE | _ => Scan.fail ()))
haftmann@63174
   756
    || ((Parse.term ::: (Scan.repeat (@{keyword "|"} |-- Parse.term))) >> SOME))) (SOME []);
haftmann@36470
   757
haftmann@36470
   758
in
haftmann@36470
   759
haftmann@36470
   760
val _ =
wenzelm@59936
   761
  Outer_Syntax.command @{command_keyword code_reflect}
wenzelm@46961
   762
    "enrich runtime environment with generated code"
haftmann@63174
   763
    (Parse.name -- Scan.optional (@{keyword "datatypes"} |-- Parse.!!! (parse_datatype
wenzelm@46949
   764
      ::: Scan.repeat (@{keyword "and"} |-- parse_datatype))) []
haftmann@52434
   765
    -- Scan.optional (@{keyword "functions"} |-- Parse.!!!  (Scan.repeat1 Parse.name)) []
haftmann@52434
   766
    -- Scan.option (@{keyword "file"} |-- Parse.!!! Parse.name)
wenzelm@46961
   767
    >> (fn (((module_name, raw_datatypes), raw_functions), some_file) => Toplevel.theory
wenzelm@46961
   768
      (code_reflect_cmd raw_datatypes raw_functions module_name some_file)));
haftmann@36470
   769
haftmann@36470
   770
end; (*local*)
haftmann@36470
   771
haftmann@39816
   772
haftmann@39816
   773
(** using external SML files as substitute for proper definitions -- only for polyml!  **)
haftmann@39816
   774
haftmann@39816
   775
local
haftmann@39816
   776
wenzelm@39820
   777
structure Loaded_Values = Theory_Data
wenzelm@39820
   778
(
haftmann@39816
   779
  type T = string list
haftmann@39816
   780
  val empty = []
wenzelm@41472
   781
  val extend = I
wenzelm@39820
   782
  fun merge data : T = Library.merge (op =) data
haftmann@39816
   783
);
haftmann@39816
   784
haftmann@39816
   785
fun notify_val (string, value) = 
haftmann@39816
   786
  let
wenzelm@62495
   787
    val _ = #enterVal ML_Env.name_space (string, value);
wenzelm@53171
   788
    val _ = Theory.setup (Loaded_Values.map (insert (op =) string));
haftmann@39816
   789
  in () end;
haftmann@39816
   790
haftmann@39816
   791
fun abort _ = error "Only value bindings allowed.";
haftmann@39816
   792
wenzelm@62494
   793
val notifying_context : ML_Compiler0.context =
wenzelm@62354
   794
 {name_space =
wenzelm@62495
   795
   {lookupVal    = #lookupVal ML_Env.name_space,
wenzelm@62495
   796
    lookupType   = #lookupType ML_Env.name_space,
wenzelm@62495
   797
    lookupFix    = #lookupFix ML_Env.name_space,
wenzelm@62495
   798
    lookupStruct = #lookupStruct ML_Env.name_space,
wenzelm@62495
   799
    lookupSig    = #lookupSig ML_Env.name_space,
wenzelm@62495
   800
    lookupFunct  = #lookupFunct ML_Env.name_space,
haftmann@39816
   801
    enterVal     = notify_val,
haftmann@39816
   802
    enterType    = abort,
haftmann@39816
   803
    enterFix     = abort,
haftmann@39816
   804
    enterStruct  = abort,
haftmann@39816
   805
    enterSig     = abort,
haftmann@39816
   806
    enterFunct   = abort,
wenzelm@62495
   807
    allVal       = #allVal ML_Env.name_space,
wenzelm@62495
   808
    allType      = #allType ML_Env.name_space,
wenzelm@62495
   809
    allFix       = #allFix ML_Env.name_space,
wenzelm@62495
   810
    allStruct    = #allStruct ML_Env.name_space,
wenzelm@62495
   811
    allSig       = #allSig ML_Env.name_space,
wenzelm@62495
   812
    allFunct     = #allFunct ML_Env.name_space},
wenzelm@62716
   813
  print_depth = NONE,
wenzelm@62495
   814
  here = #here ML_Env.context,
wenzelm@62495
   815
  print = #print ML_Env.context,
wenzelm@62495
   816
  error = #error ML_Env.context};
haftmann@39816
   817
haftmann@39816
   818
in
haftmann@39816
   819
haftmann@39816
   820
fun use_file filepath thy =
haftmann@39816
   821
  let
haftmann@39816
   822
    val thy' = Loaded_Values.put [] thy;
wenzelm@62889
   823
    val _ = Context.put_generic_context ((SOME o Context.Theory) thy');
wenzelm@60956
   824
    val _ =
wenzelm@62902
   825
      ML_Compiler0.ML notifying_context
wenzelm@60956
   826
        {line = 0, file = Path.implode filepath, verbose = false, debug = false}
wenzelm@60956
   827
        (File.read filepath);
wenzelm@62876
   828
    val thy'' = Context.the_global_context ();
haftmann@39912
   829
    val names = Loaded_Values.get thy'';
haftmann@40320
   830
  in (names, thy'') end;
haftmann@39816
   831
haftmann@39816
   832
end;
haftmann@39816
   833
haftmann@39816
   834
fun add_definiendum (ml_name, (b, T)) thy =
haftmann@39816
   835
  thy
haftmann@39816
   836
  |> Code_Target.add_reserved target ml_name
wenzelm@63178
   837
  |> Specification.axiomatization [(b, SOME T, NoSyn)] [] [] []
haftmann@39816
   838
  |-> (fn ([Const (const, _)], _) =>
haftmann@55150
   839
    Code_Target.set_printings (Constant (const,
haftmann@52435
   840
      [(target, SOME (Code_Printer.simple_const_syntax (0, (K o K o K o Code_Printer.str) ml_name)))]))
haftmann@64940
   841
  #> tap (fn thy => Code_Target.produce_code (Proof_Context.init_global thy) false [const] target NONE Code_Target.generatedN []));
haftmann@39816
   842
haftmann@39816
   843
fun process_file filepath (definienda, thy) =
haftmann@39816
   844
  let
haftmann@39816
   845
    val (ml_names, thy') = use_file filepath thy;
haftmann@39816
   846
    val superfluous = subtract (fn ((name1, _), name2) => name1 = name2) definienda ml_names;
haftmann@39816
   847
    val _ = if null superfluous then ()
haftmann@39816
   848
      else error ("Value binding(s) " ^ commas_quote superfluous
wenzelm@41944
   849
        ^ " found in external file " ^ Path.print filepath
haftmann@39816
   850
        ^ " not present among the given contants binding(s).");
haftmann@39816
   851
    val these_definienda = AList.make (the o AList.lookup (op =) definienda) ml_names;
haftmann@39816
   852
    val thy'' = fold add_definiendum these_definienda thy';
haftmann@39816
   853
    val definienda' = fold (AList.delete (op =)) ml_names definienda;
haftmann@39816
   854
  in (definienda', thy'') end;
haftmann@39816
   855
haftmann@39816
   856
fun polyml_as_definition bTs filepaths thy =
haftmann@39816
   857
  let
haftmann@39816
   858
    val definienda = map (fn bT => ((Binding.name_of o fst) bT, bT)) bTs;
haftmann@39816
   859
    val (remaining, thy') = fold process_file filepaths (definienda, thy);
haftmann@39816
   860
    val _ = if null remaining then ()
haftmann@39816
   861
      else error ("Constant binding(s) " ^ commas_quote (map fst remaining)
haftmann@39816
   862
        ^ " not present in external file(s).");
haftmann@39816
   863
  in thy' end;
haftmann@39816
   864
haftmann@28054
   865
end; (*struct*)