src/Tools/Code/code_eval.ML
author haftmann
Mon Dec 07 16:27:48 2009 +0100 (2009-12-07)
changeset 34028 1e6206763036
parent 33992 src/Tools/Code/code_ml.ML@bf22ff4f3d19
child 34032 f13b5c023e65
permissions -rw-r--r--
split off evaluation mechanisms in separte module Code_Eval
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(*  Title:      Tools/code/code_eval.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_EVAL =
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sig
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  val target: string
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  val eval: string option -> string * (unit -> 'a) option Unsynchronized.ref
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    -> ((term -> term) -> 'a -> 'a) -> theory -> term -> string list -> 'a
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  val evaluation_code: theory -> string list -> string list
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    -> string * ((string * string) list * (string * string) list)
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  val setup: theory -> theory
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end;
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structure Code_Eval : CODE_EVAL =
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struct
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(** generic **)
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val target = "Eval";
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val eval_struct_name = "Code"
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fun evaluation_code thy tycos consts =
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  let
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    val (consts', (naming, program)) = Code_Thingol.consts_program thy 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_ML.evaluation_code_of thy target
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      (SOME eval_struct_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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(** evaluation **)
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fun eval some_target reff postproc thy t args =
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  let
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    val ctxt = ProofContext.init thy;
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    fun evaluator naming program ((_, (_, ty)), t) deps =
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      let
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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 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, (([], ty), [(([], t), (Drule.dummy_thm, true))])))
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          |> fold (curry Graph.add_edge value_name) deps;
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        val (value_code, [SOME value_name']) = Code_ML.evaluation_code_of thy
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          (the_default target some_target) NONE naming program' [value_name];
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        val sml_code = "let\n" ^ value_code ^ "\nin " ^ value_name'
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          ^ space_implode " " (map (enclose "(" ")") args) ^ " end";
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      in ML_Context.evaluate ctxt false reff sml_code end;
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  in Code_Thingol.eval thy postproc evaluator t end;
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(** instrumentalization by antiquotation **)
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local
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structure CodeAntiqData = Proof_Data
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(
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  type T = (string list * string list) * (bool * (string
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    * (string * ((string * string) list * (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 CodeAntiqData.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), (_, (struct_name, _))) = CodeAntiqData.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 (struct_name', ctxt') = if struct_name = ""
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      then ML_Antiquote.variant eval_struct_name ctxt
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      else (struct_name, ctxt);
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    val acc_code = Lazy.lazy (fn () => evaluation_code (ProofContext.theory_of ctxt) tycos' consts');
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  in CodeAntiqData.put ((tycos', consts'), (false, (struct_name', acc_code))) ctxt' end;
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fun register_const const = register_code [] [const];
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fun register_datatype tyco constrs = register_code [tyco] constrs;
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fun print_const const all_struct_name tycos_map 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_datatype tyco constrs all_struct_name tycos_map consts_map =
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  let
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    val upperize = implode o nth_map 0 Symbol.to_ascii_upper o explode;
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    fun check_base name name'' =
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      if upperize (Long_Name.base_name name) = upperize name''
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      then () else error ("Name as printed " ^ quote name''
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        ^ "\ndiffers from logical base name " ^ quote (Long_Name.base_name name) ^ "; sorry.");
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    val tyco'' = (the o AList.lookup (op =) tycos_map) tyco;
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    val constrs'' = map (the o AList.lookup (op =) consts_map) constrs;
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    val _ = check_base tyco tyco'';
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    val _ = map2 check_base constrs constrs'';
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  in "datatype " ^ tyco'' ^ " = datatype " ^ Long_Name.append all_struct_name tyco'' end;
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fun print_code struct_name is_first print_it ctxt =
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  let
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    val (_, (_, (struct_code_name, acc_code))) = CodeAntiqData.get ctxt;
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    val (ml_code, (tycos_map, 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 = Long_Name.append struct_name struct_code_name;
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  in (ml_code, print_it all_struct_name tycos_map consts_map) end;
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in
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fun ml_code_antiq raw_const {struct_name, 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 struct_name is_first (print_const const), background') end;
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fun ml_code_datatype_antiq (raw_tyco, raw_constrs) {struct_name, background} =
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  let
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    val thy = ProofContext.theory_of background;
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    val tyco = Sign.intern_type thy raw_tyco;
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    val constrs = map (Code.check_const thy) raw_constrs;
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    val constrs' = (map fst o snd o Code.get_datatype thy) tyco;
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    val _ = if eq_set (op =) (constrs, constrs') then ()
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      else error ("Type " ^ quote tyco ^ ": given constructors diverge from real constructors")
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    val is_first = is_first_occ background;
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    val background' = register_datatype tyco constrs background;
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  in (print_code struct_name is_first (print_datatype tyco constrs), background') end;
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end; (*local*)
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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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val _ = ML_Context.add_antiq "code_datatype" (fn _ =>
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  (Args.tyname --| Scan.lift (Args.$$$ "=")
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    -- (Args.term ::: Scan.repeat (Scan.lift (Args.$$$ "|") |-- Args.term)))
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      >> ml_code_datatype_antiq);
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val setup = Code_Target.extend_target (target, (Code_ML.target_SML, K I));
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end; (*struct*)