src/Tools/Code/code_runtime.ML
author haftmann
Mon, 08 Nov 2010 10:43:24 +0100
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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 -> theory -> 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 -> theory -> string option
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    -> ((term -> term) -> 'a -> 'a) -> term -> string list -> 'a
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  val dynamic_value_exn: 'a cookie -> theory -> 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 -> theory -> string option
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    -> ((term -> term) -> 'a -> 'a) -> string list -> term -> 'a option
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  val static_value_strict: 'a cookie -> theory -> string option
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    -> ((term -> term) -> 'a -> 'a) -> string list -> term -> 'a
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  val static_value_exn: 'a cookie -> theory -> string option
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    -> ((term -> term) -> 'a -> 'a) -> string list -> term -> 'a Exn.result
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  val dynamic_holds_conv: conv
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  val static_holds_conv: theory -> string list -> 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 trace: bool Unsynchronized.ref
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  val polyml_as_definition: (binding * typ) list -> Path.T list -> theory -> theory
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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_Thingol;
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(** evaluation **)
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(* technical prerequisites *)
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val this = "Code_Runtime";
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val s_truth = Long_Name.append this "truth";
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val s_Holds = Long_Name.append this "Holds";
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val target = "Eval";
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datatype truth = Holds;
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val _ = Context.>> (Context.map_theory
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  (Code_Target.extend_target (target, (Code_ML.target_SML, K I))
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  #> Code_Target.add_tyco_syntax target @{type_name prop}
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       (SOME (0, (K o K o K) (Code_Printer.str s_truth)))
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  #> Code_Target.add_const_syntax target @{const_name Code_Generator.holds}
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       (SOME (Code_Printer.plain_const_syntax s_Holds))
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  #> Code_Target.add_reserved target this
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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 = Unsynchronized.ref false;
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fun exec verbose code =
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  (if ! trace then tracing code else ();
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  ML_Context.exec (fn () => Secure.use_text ML_Env.local_context (0, "generated code") verbose code));
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fun value ctxt (get, put, put_ml) (prelude, value) =
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  let
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    val code = (prelude
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      ^ "\nval _ = Context.set_thread_data (SOME (Context.map_proof (" ^ put_ml
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      ^ " (fn () => " ^ value ^ ")) (ML_Context.the_generic_context ())))");
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    val ctxt' = ctxt
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      |> put (fn () => error ("Bad evaluation for " ^ quote put_ml))
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      |> Context.proof_map (exec false code);
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  in get ctxt' () end;
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(* evaluation into target 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 thy t =
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  let
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    val ctxt = ProofContext.init_global thy;
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  in ((Sign.no_frees ctxt o Sign.no_vars ctxt o map_types (K dummyT)) t; t) end;
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fun obtain_serializer thy some_target = Code_Target.produce_code_for thy
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  (the_default target some_target) NONE "Code" [];
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fun base_evaluator cookie serializer (naming : Code_Thingol.naming) thy program ((vs, ty), t) deps args =
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  let
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    val ctxt = ProofContext.init_global thy;
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    val _ = if Code_Thingol.contains_dictvar t then
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      error "Term to be evaluated contains free dictionaries" else ();
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    val v' = Name.variant (map fst vs) "a";
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    val vs' = (v', []) :: vs
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    val ty' = Code_Thingol.fun_tyco `%% [ITyVar v', ty];
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    val value_name = "Value.value.value"
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    val program' = program
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      |> Graph.new_node (value_name,
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          Code_Thingol.Fun (Term.dummy_patternN, (((vs', ty'), [(([IVar NONE], t), (NONE, true))]), NONE)))
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      |> fold (curry Graph.add_edge value_name) deps;
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    val (program_code, [SOME value_name']) = serializer naming program' [value_name];
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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 thy some_target postproc t args =
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  let
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    val _ = reject_vars thy t;
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    fun evaluator naming program ((_, vs_ty), t) deps =
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      base_evaluator cookie (obtain_serializer thy some_target) naming thy program (vs_ty, t) deps args;
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  in Code_Thingol.dynamic_eval_value thy (Exn.map_result o postproc) evaluator t end;
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fun dynamic_value_strict cookie thy some_target postproc t args =
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  Exn.release (dynamic_value_exn cookie thy some_target postproc t args);
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fun dynamic_value cookie thy some_target postproc t args =
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  partiality_as_none (dynamic_value_exn cookie thy some_target postproc t args);
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fun static_value_exn cookie thy some_target postproc consts =
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  let
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    val serializer = obtain_serializer thy some_target;
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    fun evaluator naming program thy ((_, vs_ty), t) deps =
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      base_evaluator cookie serializer naming thy program (vs_ty, t) deps [];
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  in Code_Thingol.static_eval_value thy (Exn.map_result o postproc) consts evaluator o reject_vars thy end;
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fun static_value_strict cookie thy some_target postproc consts t =
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  Exn.release (static_value_exn cookie thy some_target postproc consts t);
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fun static_value cookie thy some_target postproc consts t =
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  partiality_as_none (static_value_exn cookie thy some_target postproc consts t);
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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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  fun init _ () = error "Truth_Result"
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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, Long_Name.append this "put_truth");
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val reject_vars = fn thy => tap (reject_vars thy o Thm.term_of);
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fun check_holds serializer naming thy program vs_t deps 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_global thy t)
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      else ();
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    val iff = Thm.cterm_of thy (Term.Const ("==", propT --> propT --> propT));
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    val result = case partiality_as_none (base_evaluator truth_cookie serializer naming thy program vs_t deps [])
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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.name "holds_by_evaluation",
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  fn (serializer, naming, thy, program, vs_t, deps, ct) => check_holds serializer naming thy program vs_t deps ct)));
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fun check_holds_oracle serializer naming thy program ((_, vs_ty), t) deps ct =
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  raw_check_holds_oracle (serializer, naming, thy, program, (vs_ty, t), deps, ct);
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val dynamic_holds_conv = Conv.tap_thy (fn thy => Code_Thingol.dynamic_eval_conv thy
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  (fn naming => check_holds_oracle (obtain_serializer thy NONE) naming thy)
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  o reject_vars thy);
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fun static_holds_conv thy consts =
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  let
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    val serializer = obtain_serializer thy NONE;
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  in
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    Code_Thingol.static_eval_conv thy consts
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      (fn naming => fn program => fn thy => check_holds_oracle serializer naming thy program)
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    o reject_vars thy
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  end;
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(** instrumentalization **)
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fun evaluation_code thy module_name tycos consts =
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  let
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    val (consts', (naming, program)) = Code_Thingol.consts_program thy false consts;
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    val tycos' = map (the o Code_Thingol.lookup_tyco naming) tycos;
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    val (ml_code, target_names) = Code_Target.produce_code_for thy
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      target NONE module_name [] naming program (consts' @ tycos');
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    val (consts'', tycos'') = chop (length consts') target_names;
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    val consts_map = map2 (fn const => fn NONE =>
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        error ("Constant " ^ (quote o Code.string_of_const thy) const
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          ^ "\nhas a user-defined serialization")
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      | SOME const'' => (const, const'')) consts consts''
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    val tycos_map = map2 (fn tyco => fn NONE =>
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        error ("Type " ^ (quote o Sign.extern_type thy) tyco
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          ^ "\nhas a user-defined serialization")
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      | SOME tyco'' => (tyco, tyco'')) tycos tycos'';
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  in (ml_code, (tycos_map, consts_map)) end;
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(* by antiquotation *)
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local
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structure Code_Antiq_Data = Proof_Data
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(
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  type T = (string list * string list) * (bool
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    * (string * (string * string) list) lazy);
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  fun init _ = (([], []), (true, (Lazy.value ("", []))));
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);
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val is_first_occ = fst o snd o Code_Antiq_Data.get;
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fun register_code new_tycos new_consts ctxt =
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  let
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    val ((tycos, consts), _) = Code_Antiq_Data.get ctxt;
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    val tycos' = fold (insert (op =)) new_tycos tycos;
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    val consts' = fold (insert (op =)) new_consts consts;
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    val acc_code = Lazy.lazy (fn () =>
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      evaluation_code (ProofContext.theory_of ctxt) "Code" tycos' consts'
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      |> apsnd fst);
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  in Code_Antiq_Data.put ((tycos', consts'), (false, acc_code)) ctxt end;
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fun register_const const = register_code [] [const];
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fun print_const const all_struct_name consts_map =
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  (Long_Name.append all_struct_name o the o AList.lookup (op =) consts_map) const;
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fun print_code is_first const ctxt =
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  let
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    val (_, (_, acc_code)) = Code_Antiq_Data.get ctxt;
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    val (ml_code, consts_map) = Lazy.force acc_code;
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    val ml_code = if is_first then ml_code
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      else "";
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    val all_struct_name = "Isabelle";
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  in (ml_code, print_const const all_struct_name consts_map) end;
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in
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fun ml_code_antiq raw_const background =
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  let
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    val const = Code.check_const (ProofContext.theory_of background) raw_const;
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    val is_first = is_first_occ background;
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    val background' = register_const const background;
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  in (print_code is_first const, background') end;
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end; (*local*)
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(* reflection support *)
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fun check_datatype thy tyco some_consts =
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  let
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    val constrs = (map (fst o fst) o snd o Code.get_type thy) tyco;
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    val _ = case some_consts
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     of SOME consts =>
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          let
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            val missing_constrs = subtract (op =) consts constrs;
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            val _ = if null missing_constrs then []
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              else error ("Missing constructor(s) " ^ commas (map quote missing_constrs)
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                ^ " for datatype " ^ quote tyco);
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            val false_constrs = subtract (op =) constrs consts;
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            val _ = if null false_constrs then []
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              else error ("Non-constructor(s) " ^ commas (map quote false_constrs)
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                ^ " for datatype " ^ quote tyco)
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          in () end
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      | NONE => ();
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  in (tyco, constrs) end;
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fun add_eval_tyco (tyco, tyco') thy =
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  let
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    val k = Sign.arity_number thy tyco;
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    fun pr pr' _ [] = tyco'
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      | pr pr' _ [ty] =
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          Code_Printer.concat [pr' Code_Printer.BR ty, tyco']
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      | pr pr' _ tys =
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          Code_Printer.concat [Code_Printer.enum "," "(" ")" (map (pr' Code_Printer.BR) tys), tyco']
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  in
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    thy
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    |> Code_Target.add_tyco_syntax target tyco (SOME (k, pr))
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  end;
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fun add_eval_constr (const, const') thy =
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  let
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    val k = Code.args_number thy const;
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    fun pr pr' fxy ts = Code_Printer.brackify fxy
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      (const' :: the_list (Code_Printer.tuplify pr' Code_Printer.BR (map fst ts)));
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  in
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    thy
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    |> Code_Target.add_const_syntax target const (SOME (Code_Printer.simple_const_syntax (k, pr)))
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  end;
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fun add_eval_const (const, const') = Code_Target.add_const_syntax target
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  const (SOME (Code_Printer.simple_const_syntax (0, (K o K o K) const')));
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fun process_reflection (code, (tyco_map, (constr_map, const_map))) module_name NONE thy =
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      thy
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      |> Code_Target.add_reserved target module_name
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      |> Context.theory_map (exec true code)
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      |> fold (add_eval_tyco o apsnd Code_Printer.str) tyco_map
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      |> fold (add_eval_constr o apsnd Code_Printer.str) constr_map
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      |> fold (add_eval_const o apsnd Code_Printer.str) const_map
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  | process_reflection (code, _) _ (SOME file_name) thy =
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      let
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        val preamble =
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          "(* Generated from " ^ Path.implode (Thy_Header.thy_path (Context.theory_name thy))
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          ^ "; DO NOT EDIT! *)";
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        val _ = File.write (Path.explode file_name) (preamble ^ "\n\n" ^ code);
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      in
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        thy
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      end;
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fun gen_code_reflect prep_type prep_const raw_datatypes raw_functions module_name some_file thy  =
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  let
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    val datatypes = map (fn (raw_tyco, raw_cos) =>
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      (prep_type thy raw_tyco, (Option.map o map) (prep_const thy) raw_cos)) raw_datatypes;
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    val (tycos, constrs) = map_split (uncurry (check_datatype thy)) datatypes
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      |> apsnd flat;
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    val functions = map (prep_const thy) raw_functions;
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    val result = evaluation_code thy module_name tycos (constrs @ functions)
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      |> (apsnd o apsnd) (chop (length constrs));
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  in
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    thy
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    |> process_reflection result module_name some_file
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  end;
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val code_reflect = gen_code_reflect Code_Target.cert_tyco (K I);
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val code_reflect_cmd = gen_code_reflect Code_Target.read_tyco Code.read_const;
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(** Isar setup **)
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val _ = ML_Context.add_antiq "code" (fn _ => Args.term >> ml_code_antiq);
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local
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val datatypesK = "datatypes";
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val functionsK = "functions";
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val fileK = "file";
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val andK = "and"
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val _ = List.app Keyword.keyword [datatypesK, functionsK];
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val parse_datatype =
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  Parse.name --| Parse.$$$ "=" -- ((Parse.string >> (fn "*" => NONE | _ => Scan.fail ()))
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    || ((Parse.term ::: (Scan.repeat (Parse.$$$ "|" |-- Parse.term))) >> SOME));
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in
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val _ =
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  Outer_Syntax.command "code_reflect" "enrich runtime environment with generated code"
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    Keyword.thy_decl (Parse.name -- Scan.optional (Parse.$$$ datatypesK |-- (parse_datatype
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      ::: Scan.repeat (Parse.$$$ andK |-- parse_datatype))) []
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    -- Scan.optional (Parse.$$$ functionsK |-- Scan.repeat1 Parse.name) []
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    -- Scan.option (Parse.$$$ fileK |-- Parse.name)
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  >> (fn (((module_name, raw_datatypes), raw_functions), some_file) => Toplevel.theory
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    (code_reflect_cmd raw_datatypes raw_functions module_name some_file)));
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end; (*local*)
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(** using external SML files as substitute for proper definitions -- only for polyml!  **)
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local
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structure Loaded_Values = Theory_Data
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(
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  type T = string list
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  val empty = []
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  fun merge data : T = Library.merge (op =) data
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  val extend = I
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);
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fun notify_val (string, value) = 
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  let
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    val _ = #enterVal ML_Env.name_space (string, value);
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   385
    val _ = Context.>> ((Context.map_theory o Loaded_Values.map) (insert (op =) string));
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  in () end;
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fun abort _ = error "Only value bindings allowed.";
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   390
val notifying_context : use_context =
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   391
 {tune_source = #tune_source ML_Env.local_context,
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   392
  name_space =
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   393
   {lookupVal    = #lookupVal ML_Env.name_space,
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   394
    lookupType   = #lookupType ML_Env.name_space,
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   395
    lookupFix    = #lookupFix ML_Env.name_space,
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   396
    lookupStruct = #lookupStruct ML_Env.name_space,
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   397
    lookupSig    = #lookupSig ML_Env.name_space,
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   398
    lookupFunct  = #lookupFunct ML_Env.name_space,
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   399
    enterVal     = notify_val,
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   400
    enterType    = abort,
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   401
    enterFix     = abort,
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diff changeset
   402
    enterStruct  = abort,
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   403
    enterSig     = abort,
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   404
    enterFunct   = abort,
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diff changeset
   405
    allVal       = #allVal ML_Env.name_space,
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   406
    allType      = #allType ML_Env.name_space,
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   407
    allFix       = #allFix ML_Env.name_space,
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diff changeset
   408
    allStruct    = #allStruct ML_Env.name_space,
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diff changeset
   409
    allSig       = #allSig ML_Env.name_space,
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diff changeset
   410
    allFunct     = #allFunct ML_Env.name_space},
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   411
  str_of_pos = #str_of_pos ML_Env.local_context,
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   412
  print = #print ML_Env.local_context,
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diff changeset
   413
  error = #error ML_Env.local_context};
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   414
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   415
in
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   416
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   417
fun use_file filepath thy =
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   418
  let
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   419
    val thy' = Loaded_Values.put [] thy;
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diff changeset
   420
    val _ = Context.set_thread_data ((SOME o Context.Theory) thy');
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diff changeset
   421
    val _ = Secure.use_text notifying_context
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diff changeset
   422
      (0, Path.implode filepath) false (File.read filepath);
39912
2ffe7060ca75 avoid antiquotation processing for code_reflect; moved ML_Context.value to Code_Runtime
haftmann
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diff changeset
   423
    val thy'' = (Context.the_theory o the) (Context.thread_data ());
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diff changeset
   424
    val names = Loaded_Values.get thy'';
40320
abc52faa7761 polyml_as_definition does not require explicit dependencies on external ML files
haftmann
parents: 40257
diff changeset
   425
  in (names, thy'') end;
39816
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diff changeset
   426
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
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diff changeset
   427
end;
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diff changeset
   428
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
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diff changeset
   429
fun add_definiendum (ml_name, (b, T)) thy =
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
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diff changeset
   430
  thy
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   431
  |> Code_Target.add_reserved target ml_name
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   432
  |> Specification.axiomatization [(b, SOME T, NoSyn)] []
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   433
  |-> (fn ([Const (const, _)], _) =>
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   434
     Code_Target.add_const_syntax target const
39912
2ffe7060ca75 avoid antiquotation processing for code_reflect; moved ML_Context.value to Code_Runtime
haftmann
parents: 39816
diff changeset
   435
       (SOME (Code_Printer.simple_const_syntax (0, (K o K o K o Code_Printer.str) ml_name)))
2ffe7060ca75 avoid antiquotation processing for code_reflect; moved ML_Context.value to Code_Runtime
haftmann
parents: 39816
diff changeset
   436
  #> tap (fn thy => Code_Target.produce_code thy [const] target NONE "Code" []));
39816
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   437
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   438
fun process_file filepath (definienda, thy) =
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   439
  let
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   440
    val (ml_names, thy') = use_file filepath thy;
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   441
    val superfluous = subtract (fn ((name1, _), name2) => name1 = name2) definienda ml_names;
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   442
    val _ = if null superfluous then ()
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   443
      else error ("Value binding(s) " ^ commas_quote superfluous
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   444
        ^ " found in external file " ^ quote (Path.implode filepath)
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   445
        ^ " not present among the given contants binding(s).");
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   446
    val these_definienda = AList.make (the o AList.lookup (op =) definienda) ml_names;
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   447
    val thy'' = fold add_definiendum these_definienda thy';
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   448
    val definienda' = fold (AList.delete (op =)) ml_names definienda;
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   449
  in (definienda', thy'') end;
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   450
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   451
fun polyml_as_definition bTs filepaths thy =
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   452
  let
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   453
    val definienda = map (fn bT => ((Binding.name_of o fst) bT, bT)) bTs;
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   454
    val (remaining, thy') = fold process_file filepaths (definienda, thy);
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   455
    val _ = if null remaining then ()
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   456
      else error ("Constant binding(s) " ^ commas_quote (map fst remaining)
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   457
        ^ " not present in external file(s).");
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   458
  in thy' end;
c7cec137c48a added polyml_as_definition -- using external SML files as substitute for proper definitions -- only for polyml!
haftmann
parents: 39605
diff changeset
   459
28054
2b84d34c5d02 restructured and split code serializer module
haftmann
parents:
diff changeset
   460
end; (*struct*)