src/Pure/codegen.ML
author wenzelm
Sat Sep 01 00:20:44 2001 +0200 (2001-09-01)
changeset 11546 2b3f02227c35
parent 11539 0f17da240450
child 12123 739eba13e2cd
permissions -rw-r--r--
tuned;
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(*  Title:      Pure/codegen.ML
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    ID:         $Id$
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    Author:     Stefan Berghofer, TU Muenchen
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    License:    GPL (GNU GENERAL PUBLIC LICENSE)
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Generic code generator.
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*)
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signature CODEGEN =
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sig
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  val quiet_mode : bool ref
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  val message : string -> unit
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  datatype mixfix =
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      Arg
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    | Ignore
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    | Pretty of Pretty.T
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    | Term of term;
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  val add_codegen: string ->
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    (theory -> (exn option * string) Graph.T -> string -> bool -> term ->
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    ((exn option * string) Graph.T * Pretty.T) option) -> theory -> theory
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  val print_codegens: theory -> unit
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  val generate_code: theory -> (string * string) list -> string
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  val generate_code_i: theory -> (string * term) list -> string
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  val assoc_consts: (xstring * string option * mixfix list) list -> theory -> theory
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  val assoc_consts_i: (xstring * typ option * mixfix list) list -> theory -> theory
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  val assoc_types: (xstring * string) list -> theory -> theory
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  val get_assoc_code: theory -> string -> typ -> mixfix list option
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  val get_assoc_types: theory -> (string * string) list
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  val invoke_codegen: theory -> (exn option * string) Graph.T ->
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    string -> bool -> term -> (exn option * string) Graph.T * Pretty.T
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  val mk_const_id: Sign.sg -> string -> string
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  val mk_type_id: Sign.sg -> string -> string
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  val rename_term: term -> term
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  val get_defn: theory -> string -> typ -> ((term list * term) * int option) option
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  val is_instance: theory -> typ -> typ -> bool
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  val parens: Pretty.T -> Pretty.T
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  val mk_app: bool -> Pretty.T -> Pretty.T list -> Pretty.T
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  val eta_expand: term -> term list -> int -> term
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  val parsers: OuterSyntax.parser list
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  val setup: (theory -> theory) list
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end;
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structure Codegen : CODEGEN =
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struct
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val quiet_mode = ref true;
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fun message s = if !quiet_mode then () else writeln s;
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(**** Mixfix syntax ****)
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datatype mixfix =
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    Arg
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  | Ignore
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  | Pretty of Pretty.T
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  | Term of term;
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fun is_arg Arg = true
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  | is_arg Ignore = true
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  | is_arg _ = false;
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fun terms_of [] = []
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  | terms_of (Term t :: ms) = t :: terms_of ms
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  | terms_of (_ :: ms) = terms_of ms;
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val num_args = length o filter is_arg;
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(**** theory data ****)
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(* data kind 'Pure/codegen' *)
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structure CodegenArgs =
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struct
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  val name = "Pure/codegen";
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  type T =
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    {codegens : (string * (theory -> (exn option * string) Graph.T -> string ->
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       bool -> term -> ((exn option * string) Graph.T * Pretty.T) option)) list,
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     consts : ((string * typ) * mixfix list) list,
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     types : (string * string) list};
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  val empty = {codegens = [], consts = [], types = []};
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  val copy = I;
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  val prep_ext = I;
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  fun merge ({codegens = codegens1, consts = consts1, types = types1},
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             {codegens = codegens2, consts = consts2, types = types2}) =
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    {codegens = rev (merge_alists (rev codegens1) (rev codegens2)),
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     consts   = merge_alists consts1 consts2,
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     types    = merge_alists types1 types2};
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  fun print sg (cs:T) = Pretty.writeln
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    (Pretty.strs ("code generators:" :: map fst (#codegens cs)));
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end;
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structure CodegenData = TheoryDataFun(CodegenArgs);
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val print_codegens = CodegenData.print;
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(**** add new code generator to theory ****)
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fun add_codegen name f thy =
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  let val {codegens, consts, types} = CodegenData.get thy
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  in (case assoc (codegens, name) of
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      None => CodegenData.put {codegens = (name, f)::codegens,
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        consts = consts, types = types} thy
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    | Some _ => error ("Code generator " ^ name ^ " already declared"))
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  end;
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(**** associate constants with target language code ****)
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fun gen_assoc_consts prep_type xs thy = foldl (fn (thy, (s, tyopt, syn)) =>
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  let
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    val sg = sign_of thy;
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    val {codegens, consts, types} = CodegenData.get thy;
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    val cname = Sign.intern_const sg s;
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  in
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    (case Sign.const_type sg cname of
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       Some T =>
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         let val T' = (case tyopt of
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                None => T
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              | Some ty =>
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                  let val U = prep_type sg ty
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                  in if Type.typ_instance (Sign.tsig_of sg, U, T) then U
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                    else error ("Illegal type constraint for constant " ^ cname)
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                  end)
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         in (case assoc (consts, (cname, T')) of
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             None => CodegenData.put {codegens = codegens,
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               consts = ((cname, T'), syn) :: consts, types = types} thy
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           | Some _ => error ("Constant " ^ cname ^ " already associated with code"))
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         end
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     | _ => error ("Not a constant: " ^ s))
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  end) (thy, xs);
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val assoc_consts_i = gen_assoc_consts (K I);
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val assoc_consts = gen_assoc_consts (fn sg => typ_of o read_ctyp sg);
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(**** associate types with target language types ****)
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fun assoc_types xs thy = foldl (fn (thy, (s, syn)) =>
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  let
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    val {codegens, consts, types} = CodegenData.get thy;
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    val tc = Sign.intern_tycon (sign_of thy) s
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  in
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    (case assoc (types, tc) of
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       None => CodegenData.put {codegens = codegens, consts = consts,
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         types = (tc, syn) :: types} thy
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     | Some _ => error ("Type " ^ tc ^ " already associated with code"))
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  end) (thy, xs);
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fun get_assoc_types thy = #types (CodegenData.get thy);
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(**** retrieve definition of constant ****)
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fun is_instance thy T1 T2 =
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  Type.typ_instance (Sign.tsig_of (sign_of thy), T1, Type.varifyT T2);
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fun get_assoc_code thy s T = apsome snd (find_first (fn ((s', T'), _) =>
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  s = s' andalso is_instance thy T T') (#consts (CodegenData.get thy)));
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fun get_defn thy s T =
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  let
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    val axms = flat (map (Symtab.dest o #axioms o Theory.rep_theory)
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      (thy :: Theory.ancestors_of thy));
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    val defs = mapfilter (fn (_, t) =>
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      (let
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         val (lhs, rhs) = Logic.dest_equals t;
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         val (c, args) = strip_comb lhs;
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         val (s', T') = dest_Const c
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       in if s=s' then Some (T', (args, rhs)) else None end) handle TERM _ =>
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         None) axms;
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    val i = find_index (is_instance thy T o fst) defs
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  in
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    if i>=0 then Some (snd (nth_elem (i, defs)),
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      if length defs = 1 then None else Some i)
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    else None
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  end;
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(**** make valid ML identifiers ****)
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fun gen_mk_id kind rename sg s =
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  let
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    val (xs as x::_) = explode (rename (space_implode "_"
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      (NameSpace.unpack (Sign.cond_extern sg kind s))));
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    fun check_str [] = ""
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      | check_str (x::xs) =
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          (if Symbol.is_letter x orelse Symbol.is_digit x orelse x="_" then x
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           else "_" ^ string_of_int (ord x)) ^ check_str xs
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  in
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    (if not (Symbol.is_letter x) then "id" else "") ^ check_str xs
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  end;
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val mk_const_id = gen_mk_id Sign.constK I;
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val mk_type_id = gen_mk_id Sign.typeK
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  (fn s => if s mem ThmDatabase.ml_reserved then s ^ "_type" else s);
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fun rename_term t =
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  let
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    val names = add_term_names (t, map (fst o fst o dest_Var) (term_vars t));
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    val clash = names inter ThmDatabase.ml_reserved;
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    val ps = clash ~~ variantlist (clash, names);
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    fun rename (Var ((a, i), T)) = Var ((if_none (assoc (ps, a)) a, i), T)
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      | rename (Free (a, T)) = Free (if_none (assoc (ps, a)) a, T)
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      | rename (Abs (s, T, t)) = Abs (s, T, rename t)
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      | rename (t $ u) = rename t $ rename u
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      | rename t = t;
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  in
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    rename t
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  end;
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(**** invoke suitable code generator for term t ****)
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fun invoke_codegen thy gr dep brack t = (case get_first
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   (fn (_, f) => f thy gr dep brack t) (#codegens (CodegenData.get thy)) of
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      None => error ("Unable to generate code for term:\n" ^
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        Sign.string_of_term (sign_of thy) t ^ "\nrequired by:\n" ^
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        commas (Graph.all_succs gr [dep]))
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    | Some x => x)
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(**** code generator for mixfix expressions ****)
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fun parens p = Pretty.block [Pretty.str "(", p, Pretty.str ")"];
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fun pretty_fn [] p = [p]
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  | pretty_fn (x::xs) p = Pretty.str ("fn " ^ x ^ " =>") ::
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      Pretty.brk 1 :: pretty_fn xs p;
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fun pretty_mixfix [] [] _ = []
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  | pretty_mixfix (Arg :: ms) (p :: ps) qs = p :: pretty_mixfix ms ps qs
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  | pretty_mixfix (Ignore :: ms) (p :: ps) qs = pretty_mixfix ms ps qs
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  | pretty_mixfix (Pretty p :: ms) ps qs = p :: pretty_mixfix ms ps qs
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  | pretty_mixfix (Term _ :: ms) ps (q :: qs) = q :: pretty_mixfix ms ps qs;
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(**** default code generator ****)
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fun eta_expand t ts i =
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  let
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    val (Ts, _) = strip_type (fastype_of t);
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    val j = i - length ts
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  in
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    foldr (fn (T, t) => Abs ("x", T, t))
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      (take (j, Ts), list_comb (t, ts @ map Bound (j-1 downto 0)))
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  end;
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fun mk_app _ p [] = p
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  | mk_app brack p ps = if brack then
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       Pretty.block (Pretty.str "(" ::
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         separate (Pretty.brk 1) (p :: ps) @ [Pretty.str ")"])
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     else Pretty.block (separate (Pretty.brk 1) (p :: ps));
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fun new_names t xs = variantlist (xs,
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  map (fst o fst o dest_Var) (term_vars t) union
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  add_term_names (t, ThmDatabase.ml_reserved));
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fun new_name t x = hd (new_names t [x]);
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fun default_codegen thy gr dep brack t =
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  let
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    val (u, ts) = strip_comb t;
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    fun mapcode brack' gr ts = foldl_map
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      (fn (gr, t) => invoke_codegen thy gr dep brack' t) (gr, ts)
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  in (case u of
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      Var ((s, i), _) =>
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        let val (gr', ps) = mapcode true gr ts
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        in Some (gr', mk_app brack (Pretty.str (s ^
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           (if i=0 then "" else string_of_int i))) ps)
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        end
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    | Free (s, _) =>
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        let val (gr', ps) = mapcode true gr ts
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        in Some (gr', mk_app brack (Pretty.str s) ps) end
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    | Const (s, T) =>
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      (case get_assoc_code thy s T of
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         Some ms =>
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           let val i = num_args ms
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           in if length ts < i then
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               default_codegen thy gr dep brack (eta_expand u ts i)
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             else
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               let
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                 val ts1 = take (i, ts);
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                 val ts2 = drop (i, ts);
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                 val (gr1, ps1) = mapcode false gr ts1;
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                 val (gr2, ps2) = mapcode true gr1 ts2;
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                 val (gr3, ps3) = mapcode false gr2 (terms_of ms);
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               in
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                 Some (gr3, mk_app brack (Pretty.block (pretty_mixfix ms ps1 ps3)) ps2)
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               end
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           end
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       | None => (case get_defn thy s T of
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           None => None
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         | Some ((args, rhs), k) =>
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             let
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               val id = mk_const_id (sign_of thy) s ^ (case k of
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                 None => "" | Some i => "_def" ^ string_of_int i);
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               val (gr', ps) = mapcode true gr ts;
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             in
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               Some (Graph.add_edge (id, dep) gr' handle Graph.UNDEF _ =>
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                 let
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                   val _ = message ("expanding definition of " ^ s);
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                   val (Ts, _) = strip_type T;
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                   val (args', rhs') =
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                     if not (null args) orelse null Ts then (args, rhs) else
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                       let val v = Free (new_name rhs "x", hd Ts)
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                       in ([v], betapply (rhs, v)) end;
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                   val (gr1, p) = invoke_codegen thy (Graph.add_edge (id, dep)
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                     (Graph.new_node (id, (None, "")) gr')) id false rhs';
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                   val (gr2, xs) = mapcode false gr1 args';
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                 in Graph.map_node id (K (None, Pretty.string_of (Pretty.block
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                   (Pretty.str (if null args' then "val " else "fun ") ::
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                    separate (Pretty.brk 1) (Pretty.str id :: xs) @
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                    [Pretty.str " =", Pretty.brk 1, p, Pretty.str ";"])) ^ "\n\n")) gr2
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                 end, mk_app brack (Pretty.str id) ps)
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             end))
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    | Abs _ =>
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      let
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        val (bs, Ts) = ListPair.unzip (strip_abs_vars u);
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        val t = strip_abs_body u
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        val bs' = new_names t bs;
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        val (gr1, ps) = mapcode true gr ts;
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        val (gr2, p) = invoke_codegen thy gr1 dep false
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          (subst_bounds (map Free (rev (bs' ~~ Ts)), t));
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      in
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        Some (gr2, mk_app brack (Pretty.block (Pretty.str "(" :: pretty_fn bs' p @
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          [Pretty.str ")"])) ps)
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      end
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    | _ => None)
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  end;
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fun output_code gr xs = implode (map (snd o Graph.get_node gr)
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  (rev (Graph.all_preds gr xs)));
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fun gen_generate_code prep_term thy = Pretty.setmp_margin 80 (fn xs =>
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  let
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    val sg = sign_of thy;
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    val gr = Graph.new_node ("<Top>", (None, "")) Graph.empty;
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    val (gr', ps) = foldl_map (fn (gr, (s, t)) => apsnd (pair s)
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      (invoke_codegen thy gr "<Top>" false t)) (gr, map (apsnd (prep_term sg)) xs)
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  in
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    "structure Generated =\nstruct\n\n" ^
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    output_code gr' ["<Top>"] ^
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    space_implode "\n\n" (map (fn (s', p) => Pretty.string_of (Pretty.block
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      [Pretty.str ("val " ^ s' ^ " ="), Pretty.brk 1, p, Pretty.str ";"])) ps) ^
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    "\n\nend;\n\nopen Generated;\n"
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  end);
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val generate_code_i = gen_generate_code (K I);
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val generate_code = gen_generate_code
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  (fn sg => term_of o read_cterm sg o rpair TypeInfer.logicT);
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fun parse_mixfix rd s =
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  (case Scan.finite Symbol.stopper (Scan.repeat
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     (   $$ "_" >> K Arg
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      || $$ "?" >> K Ignore
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      || $$ "/" |-- Scan.repeat ($$ " ") >> (Pretty o Pretty.brk o length)
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      || $$ "{" |-- $$ "*" |-- Scan.repeat1
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           (   $$ "'" |-- Scan.one Symbol.not_eof
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            || Scan.unless ($$ "*" -- $$ "}") (Scan.one Symbol.not_eof)) --|
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         $$ "*" --| $$ "}" >> (Term o rd o implode)
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      || Scan.repeat1
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           (   $$ "'" |-- Scan.one Symbol.not_eof
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            || Scan.unless ($$ "_" || $$ "?" || $$ "/" || $$ "{" |-- $$ "*")
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                 (Scan.one Symbol.not_eof)) >> (Pretty o Pretty.str o implode)))
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       (Symbol.explode s) of
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     (p, []) => p
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   | _ => error ("Malformed annotation: " ^ quote s));
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structure P = OuterParse and K = OuterSyntax.Keyword;
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val assoc_typeP =
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  OuterSyntax.command "types_code"
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  "associate types with target language types" K.thy_decl
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    (Scan.repeat1 (P.xname --| P.$$$ "(" -- P.string --| P.$$$ ")") >>
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     (Toplevel.theory o assoc_types));
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val assoc_constP =
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  OuterSyntax.command "consts_code"
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  "associate constants with target language code" K.thy_decl
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    (Scan.repeat1
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       (P.xname -- (Scan.option (P.$$$ "::" |-- P.string)) --|
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        P.$$$ "(" -- P.string --| P.$$$ ")") >>
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     (fn xs => Toplevel.theory (fn thy => assoc_consts
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       (map (fn ((name, optype), mfx) => (name, optype, parse_mixfix
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         (term_of o read_cterm (sign_of thy) o rpair TypeInfer.logicT) mfx))
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           xs) thy)));
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val generate_codeP =
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  OuterSyntax.command "generate_code" "generates code for terms" K.thy_decl
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    (Scan.option (P.$$$ "(" |-- P.string --| P.$$$ ")") --
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     Scan.repeat1 (P.name --| P.$$$ "=" -- P.string) >>
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     (fn (opt_fname, xs) => Toplevel.theory (fn thy =>
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        ((case opt_fname of
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            None => use_text Context.ml_output false
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          | Some fname => File.write (Path.unpack fname))
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              (generate_code thy xs); thy))));
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val parsers = [assoc_typeP, assoc_constP, generate_codeP];
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val setup = [CodegenData.init, add_codegen "default" default_codegen];
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end;
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OuterSyntax.add_parsers Codegen.parsers;