src/Pure/Isar/code.ML
author wenzelm
Wed Nov 09 21:36:18 2011 +0100 (2011-11-09 ago)
changeset 45430 b8eb7a791dac
parent 45344 e209da839ff4
child 45987 9ba44b49859b
permissions -rw-r--r--
misc tuning;
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(*  Title:      Pure/Isar/code.ML
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    Author:     Florian Haftmann, TU Muenchen
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Abstract executable ingredients of theory.  Management of data
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dependent on executable ingredients as synchronized cache; purged
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on any change of underlying executable ingredients.
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*)
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signature CODE =
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sig
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  (*constants*)
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  val check_const: theory -> term -> string
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  val read_bare_const: theory -> string -> string * typ
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  val read_const: theory -> string -> string
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  val string_of_const: theory -> string -> string
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  val cert_signature: theory -> typ -> typ
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  val read_signature: theory -> string -> typ
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  val const_typ: theory -> string -> typ
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  val subst_signatures: theory -> term -> term
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  val args_number: theory -> string -> int
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  (*constructor sets*)
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  val constrset_of_consts: theory -> (string * typ) list
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    -> string * ((string * sort) list * (string * ((string * sort) list * typ list)) list)
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  (*code equations and certificates*)
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  val mk_eqn: theory -> thm * bool -> thm * bool
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  val mk_eqn_warning: theory -> thm -> (thm * bool) option
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  val mk_eqn_liberal: theory -> thm -> (thm * bool) option
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  val assert_eqn: theory -> thm * bool -> thm * bool
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  val const_typ_eqn: theory -> thm -> string * typ
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  val expand_eta: theory -> int -> thm -> thm
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  type cert
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  val empty_cert: theory -> string -> cert
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  val cert_of_eqns: theory -> string -> (thm * bool) list -> cert
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  val constrain_cert: theory -> sort list -> cert -> cert
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  val typargs_deps_of_cert: theory -> cert -> (string * sort) list * (string * typ list) list
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  val equations_of_cert: theory -> cert -> ((string * sort) list * typ)
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    * (((term * string option) list * (term * string option)) * (thm option * bool)) list
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  val bare_thms_of_cert: theory -> cert -> thm list
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  val pretty_cert: theory -> cert -> Pretty.T list
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  (*executable code*)
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  val add_type: string -> theory -> theory
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  val add_type_cmd: string -> theory -> theory
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  val add_signature: string * typ -> theory -> theory
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  val add_signature_cmd: string * string -> theory -> theory
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  val add_datatype: (string * typ) list -> theory -> theory
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  val add_datatype_cmd: string list -> theory -> theory
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  val datatype_interpretation:
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    (string * ((string * sort) list * (string * ((string * sort) list * typ list)) list)
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      -> theory -> theory) -> theory -> theory
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  val add_abstype: thm -> theory -> theory
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  val abstype_interpretation:
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    (string * ((string * sort) list * ((string * ((string * sort) list * typ)) * (string * thm)))
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      -> theory -> theory) -> theory -> theory
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  val add_eqn: thm -> theory -> theory
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  val add_nbe_eqn: thm -> theory -> theory
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  val add_default_eqn: thm -> theory -> theory
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  val add_default_eqn_attribute: attribute
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  val add_default_eqn_attrib: Attrib.src
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  val add_nbe_default_eqn: thm -> theory -> theory
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  val add_nbe_default_eqn_attribute: attribute
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  val add_nbe_default_eqn_attrib: Attrib.src
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  val del_eqn: thm -> theory -> theory
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  val del_eqns: string -> theory -> theory
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  val add_case: thm -> theory -> theory
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  val add_undefined: string -> theory -> theory
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  val get_type: theory -> string
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    -> ((string * sort) list * (string * ((string * sort) list * typ list)) list) * bool
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  val get_type_of_constr_or_abstr: theory -> string -> (string * bool) option
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  val is_constr: theory -> string -> bool
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  val is_abstr: theory -> string -> bool
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  val get_cert: theory -> ((thm * bool) list -> (thm * bool) list) -> string -> cert
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  val get_case_scheme: theory -> string -> (int * (int * string list)) option
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  val get_case_cong: theory -> string -> thm option
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  val undefineds: theory -> string list
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  val print_codesetup: theory -> unit
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end;
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signature CODE_DATA_ARGS =
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sig
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  type T
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  val empty: T
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end;
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signature CODE_DATA =
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sig
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  type T
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  val change: theory option -> (T -> T) -> T
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  val change_yield: theory option -> (T -> 'a * T) -> 'a * T
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end;
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signature PRIVATE_CODE =
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sig
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  include CODE
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  val declare_data: Object.T -> serial
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  val change_yield_data: serial * ('a -> Object.T) * (Object.T -> 'a)
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    -> theory -> ('a -> 'b * 'a) -> 'b * 'a
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end;
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structure Code : PRIVATE_CODE =
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struct
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(** auxiliary **)
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(* printing *)
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fun string_of_typ thy =
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  Syntax.string_of_typ (Config.put show_sorts true (Syntax.init_pretty_global thy));
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fun string_of_const thy c =
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  let val ctxt = Proof_Context.init_global thy in
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    case AxClass.inst_of_param thy c of
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      SOME (c, tyco) =>
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        Proof_Context.extern_const ctxt c ^ " " ^ enclose "[" "]"
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          (Proof_Context.extern_type ctxt tyco)
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    | NONE => Proof_Context.extern_const ctxt c
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  end;
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(* constants *)
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fun typ_equiv tys = Type.raw_instance tys andalso Type.raw_instance (swap tys);
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fun check_bare_const thy t = case try dest_Const t
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 of SOME c_ty => c_ty
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  | NONE => error ("Not a constant: " ^ Syntax.string_of_term_global thy t);
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fun check_unoverload thy (c, ty) =
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  let
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    val c' = AxClass.unoverload_const thy (c, ty);
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    val ty_decl = Sign.the_const_type thy c';
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  in
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    if Sign.typ_equiv thy (Type.strip_sorts ty_decl, Type.strip_sorts (Logic.varifyT_global ty))
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    then c'
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    else
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      error ("Type\n" ^ string_of_typ thy ty ^
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        "\nof constant " ^ quote c ^
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        "\nis too specific compared to declared type\n" ^
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        string_of_typ thy ty_decl)
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  end; 
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fun check_const thy = check_unoverload thy o check_bare_const thy;
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fun read_bare_const thy = check_bare_const thy o Syntax.read_term_global thy;
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fun read_const thy = check_unoverload thy o read_bare_const thy;
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(** data store **)
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(* datatypes *)
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datatype typ_spec = Constructors of (string * ((string * sort) list * typ list)) list *
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      string list (*references to associated case constructors*)
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  | Abstractor of (string * ((string * sort) list * typ)) * (string * thm);
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fun constructors_of (Constructors (cos, _)) = (cos, false)
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  | constructors_of (Abstractor ((co, (vs, ty)), _)) = ([(co, (vs, [ty]))], true);
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fun case_consts_of (Constructors (_, case_consts)) = case_consts
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  | case_consts_of (Abstractor _) = [];
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(* functions *)
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datatype fun_spec = Default of (thm * bool) list * (thm * bool) list lazy
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      (* (cache for default equations, lazy computation of default equations)
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         -- helps to restore natural order of default equations *)
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  | Eqns of (thm * bool) list
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  | Proj of term * string
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  | Abstr of thm * string;
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val empty_fun_spec = Default ([], Lazy.value []);
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fun is_default (Default _) = true
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  | is_default _ = false;
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fun associated_abstype (Abstr (_, tyco)) = SOME tyco
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  | associated_abstype _ = NONE;
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(* executable code data *)
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datatype spec = Spec of {
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  history_concluded: bool,
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  signatures: int Symtab.table * typ Symtab.table,
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  functions: ((bool * fun_spec) * (serial * fun_spec) list) Symtab.table
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    (*with explicit history*),
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  types: ((serial * ((string * sort) list * typ_spec)) list) Symtab.table
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    (*with explicit history*),
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  cases: ((int * (int * string list)) * thm) Symtab.table * unit Symtab.table
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};
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fun make_spec (history_concluded, ((signatures, functions), (types, cases))) =
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  Spec { history_concluded = history_concluded,
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    signatures = signatures, functions = functions, types = types, cases = cases };
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fun map_spec f (Spec { history_concluded = history_concluded, signatures = signatures,
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  functions = functions, types = types, cases = cases }) =
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  make_spec (f (history_concluded, ((signatures, functions), (types, cases))));
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fun merge_spec (Spec { history_concluded = _, signatures = (tycos1, sigs1), functions = functions1,
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    types = types1, cases = (cases1, undefs1) },
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  Spec { history_concluded = _, signatures = (tycos2, sigs2), functions = functions2,
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    types = types2, cases = (cases2, undefs2) }) =
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  let
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    val signatures = (Symtab.merge (op =) (tycos1, tycos2),
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      Symtab.merge typ_equiv (sigs1, sigs2));
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    val types = Symtab.join (K (AList.merge (op =) (K true))) (types1, types2);
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    val case_consts_of' = (maps case_consts_of o map (snd o snd o hd o snd) o Symtab.dest);
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    fun merge_functions ((_, history1), (_, history2)) =
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      let
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        val raw_history = AList.merge (op = : serial * serial -> bool)
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          (K true) (history1, history2);
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        val filtered_history = filter_out (is_default o snd) raw_history;
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        val history = if null filtered_history
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          then raw_history else filtered_history;
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      in ((false, (snd o hd) history), history) end;
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    val all_datatype_specs = map (snd o snd o hd o snd) (Symtab.dest types);
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    val all_constructors = maps (map fst o fst o constructors_of) all_datatype_specs;
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    val invalidated_case_consts = union (op =) (case_consts_of' types1) (case_consts_of' types2)
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      |> subtract (op =) (maps case_consts_of all_datatype_specs)
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    val functions = Symtab.join (K merge_functions) (functions1, functions2)
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      |> fold (fn c => Symtab.map_entry c (apfst (K (true, empty_fun_spec)))) all_constructors;
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    val cases = (Symtab.merge (K true) (cases1, cases2)
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      |> fold Symtab.delete invalidated_case_consts, Symtab.merge (K true) (undefs1, undefs2));
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  in make_spec (false, ((signatures, functions), (types, cases))) end;
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fun history_concluded (Spec { history_concluded, ... }) = history_concluded;
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fun the_signatures (Spec { signatures, ... }) = signatures;
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fun the_functions (Spec { functions, ... }) = functions;
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fun the_types (Spec { types, ... }) = types;
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fun the_cases (Spec { cases, ... }) = cases;
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val map_history_concluded = map_spec o apfst;
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val map_signatures = map_spec o apsnd o apfst o apfst;
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val map_functions = map_spec o apsnd o apfst o apsnd;
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val map_typs = map_spec o apsnd o apsnd o apfst;
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val map_cases = map_spec o apsnd o apsnd o apsnd;
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(* data slots dependent on executable code *)
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(*private copy avoids potential conflict of table exceptions*)
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structure Datatab = Table(type key = int val ord = int_ord);
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local
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type kind = { empty: Object.T };
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val kinds = Synchronized.var "Code_Data" (Datatab.empty: kind Datatab.table);
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fun invoke f k =
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  (case Datatab.lookup (Synchronized.value kinds) k of
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    SOME kind => f kind
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  | NONE => raise Fail "Invalid code data identifier");
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in
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fun declare_data empty =
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  let
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    val k = serial ();
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    val kind = { empty = empty };
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    val _ = Synchronized.change kinds (Datatab.update (k, kind));
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  in k end;
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fun invoke_init k = invoke (fn kind => #empty kind) k;
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end; (*local*)
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(* theory store *)
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local
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type data = Object.T Datatab.table;
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fun empty_dataref () = Synchronized.var "code data" (NONE : (data * theory_ref) option);
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structure Code_Data = Theory_Data
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(
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  type T = spec * (data * theory_ref) option Synchronized.var;
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  val empty = (make_spec (false, (((Symtab.empty, Symtab.empty), Symtab.empty),
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    (Symtab.empty, (Symtab.empty, Symtab.empty)))), empty_dataref ());
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  val extend = I  (* FIXME empty_dataref!?! *)
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  fun merge ((spec1, _), (spec2, _)) =
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    (merge_spec (spec1, spec2), empty_dataref ());
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);
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in
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(* access to executable code *)
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val the_exec = fst o Code_Data.get;
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fun map_exec_purge f = Code_Data.map (fn (exec, _) => (f exec, empty_dataref ()));
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fun change_fun_spec delete c f = (map_exec_purge o map_functions
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  o (if delete then Symtab.map_entry c else Symtab.map_default (c, ((false, empty_fun_spec), [])))
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    o apfst) (fn (_, spec) => (true, f spec));
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(* tackling equation history *)
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fun continue_history thy = if (history_concluded o the_exec) thy
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  then thy
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    |> (Code_Data.map o apfst o map_history_concluded) (K false)
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    |> SOME
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  else NONE;
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fun conclude_history thy = if (history_concluded o the_exec) thy
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  then NONE
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  else thy
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    |> (Code_Data.map o apfst)
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        ((map_functions o Symtab.map) (fn _ => fn ((changed, current), history) =>
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          ((false, current),
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            if changed then (serial (), current) :: history else history))
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        #> map_history_concluded (K true))
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    |> SOME;
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val _ = Context.>> (Context.map_theory (Theory.at_begin continue_history #> Theory.at_end conclude_history));
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(* access to data dependent on abstract executable code *)
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fun change_yield_data (kind, mk, dest) theory f =
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  let
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    val dataref = (snd o Code_Data.get) theory;
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    val (datatab, thy_ref) = case Synchronized.value dataref
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     of SOME (datatab, thy_ref) => if Theory.eq_thy (theory, Theory.deref thy_ref)
haftmann@34251
   329
          then (datatab, thy_ref)
haftmann@34251
   330
          else (Datatab.empty, Theory.check_thy theory)
haftmann@34251
   331
      | NONE => (Datatab.empty, Theory.check_thy theory)
haftmann@34244
   332
    val data = case Datatab.lookup datatab kind
haftmann@34244
   333
     of SOME data => data
haftmann@34244
   334
      | NONE => invoke_init kind;
haftmann@40758
   335
    val result as (_, data') = f (dest data);
haftmann@34244
   336
    val _ = Synchronized.change dataref
haftmann@34244
   337
      ((K o SOME) (Datatab.update (kind, mk data') datatab, thy_ref));
haftmann@34244
   338
  in result end;
haftmann@31962
   339
haftmann@31962
   340
end; (*local*)
haftmann@31962
   341
haftmann@31962
   342
haftmann@31962
   343
(** foundation **)
haftmann@31962
   344
haftmann@31962
   345
(* constants *)
haftmann@31962
   346
haftmann@33940
   347
fun arity_number thy tyco = case Symtab.lookup ((fst o the_signatures o the_exec) thy) tyco
haftmann@33940
   348
 of SOME n => n
haftmann@33940
   349
  | NONE => Sign.arity_number thy tyco;
haftmann@33940
   350
haftmann@33940
   351
fun build_tsig thy =
haftmann@33940
   352
  let
wenzelm@42375
   353
    val ctxt = Syntax.init_pretty_global thy;
wenzelm@42375
   354
    val (tycos, _) = the_signatures (the_exec thy);
wenzelm@42375
   355
    val decls = #types (Type.rep_tsig (Sign.tsig_of thy))
haftmann@34272
   356
      |> snd 
haftmann@34272
   357
      |> Symtab.fold (fn (tyco, n) =>
haftmann@34272
   358
          Symtab.update (tyco, Type.LogicalType n)) tycos;
haftmann@34272
   359
  in
haftmann@34272
   360
    Type.empty_tsig
wenzelm@42375
   361
    |> Symtab.fold (fn (tyco, Type.LogicalType n) => Type.add_type ctxt Name_Space.default_naming
haftmann@34272
   362
        (Binding.qualified_name tyco, n) | _ => I) decls
haftmann@34272
   363
  end;
haftmann@33940
   364
wenzelm@42375
   365
fun cert_signature thy =
wenzelm@42375
   366
  Logic.varifyT_global o Type.cert_typ (build_tsig thy) o Type.no_tvars;
haftmann@33940
   367
wenzelm@42375
   368
fun read_signature thy =
wenzelm@42375
   369
  cert_signature thy o Type.strip_sorts o Syntax.parse_typ (Proof_Context.init_global thy);
haftmann@33940
   370
haftmann@33940
   371
fun expand_signature thy = Type.cert_typ_mode Type.mode_syntax (Sign.tsig_of thy);
haftmann@33940
   372
haftmann@33940
   373
fun lookup_typ thy = Symtab.lookup ((snd o the_signatures o the_exec) thy);
haftmann@33940
   374
haftmann@33940
   375
fun const_typ thy c = case lookup_typ thy c
haftmann@33940
   376
 of SOME ty => ty
haftmann@33940
   377
  | NONE => (Type.strip_sorts o Sign.the_const_type thy) c;
haftmann@33940
   378
wenzelm@40844
   379
fun args_number thy = length o binder_types o const_typ thy;
haftmann@40764
   380
haftmann@33940
   381
fun subst_signature thy c ty =
haftmann@33940
   382
  let
haftmann@40758
   383
    fun mk_subst (Type (_, tys1)) (Type (_, tys2)) =
haftmann@33940
   384
          fold2 mk_subst tys1 tys2
haftmann@40758
   385
      | mk_subst ty (TVar (v, _)) = Vartab.update (v, ([], ty))
haftmann@33940
   386
  in case lookup_typ thy c
haftmann@33940
   387
   of SOME ty' => Envir.subst_type (mk_subst ty (expand_signature thy ty') Vartab.empty) ty'
haftmann@33940
   388
    | NONE => ty
haftmann@33940
   389
  end;
haftmann@33940
   390
haftmann@33940
   391
fun subst_signatures thy = map_aterms (fn Const (c, ty) => Const (c, subst_signature thy c ty) | t => t);
haftmann@33940
   392
haftmann@40764
   393
fun logical_typscheme thy (c, ty) =
haftmann@40764
   394
  (map dest_TFree (Sign.const_typargs thy (c, ty)), Type.strip_sorts ty);
haftmann@40764
   395
haftmann@40764
   396
fun typscheme thy (c, ty) = logical_typscheme thy (c, subst_signature thy c ty);
haftmann@31962
   397
haftmann@31962
   398
haftmann@31962
   399
(* datatypes *)
haftmann@31156
   400
haftmann@35226
   401
fun no_constr thy s (c, ty) = error ("Not a datatype constructor:\n" ^ string_of_const thy c
haftmann@35226
   402
  ^ " :: " ^ string_of_typ thy ty ^ "\n" ^ enclose "(" ")" s);
haftmann@35226
   403
haftmann@40803
   404
fun analyze_constructor thy (c, raw_ty) =
haftmann@31156
   405
  let
haftmann@35226
   406
    val _ = Thm.cterm_of thy (Const (c, raw_ty));
haftmann@35226
   407
    val ty = subst_signature thy c raw_ty;
wenzelm@45344
   408
    val ty_decl = Logic.unvarifyT_global (const_typ thy c);
haftmann@31156
   409
    fun last_typ c_ty ty =
haftmann@31156
   410
      let
haftmann@33531
   411
        val tfrees = Term.add_tfreesT ty [];
wenzelm@40844
   412
        val (tyco, vs) = (apsnd o map) dest_TFree (dest_Type (body_type ty))
haftmann@35226
   413
          handle TYPE _ => no_constr thy "bad type" c_ty
haftmann@36112
   414
        val _ = if tyco = "fun" then no_constr thy "bad type" c_ty else ();
wenzelm@45344
   415
        val _ =
wenzelm@45344
   416
          if has_duplicates (eq_fst (op =)) vs
haftmann@35226
   417
          then no_constr thy "duplicate type variables in datatype" c_ty else ();
wenzelm@45344
   418
        val _ =
wenzelm@45344
   419
          if length tfrees <> length vs
haftmann@35226
   420
          then no_constr thy "type variables missing in datatype" c_ty else ();
haftmann@31156
   421
      in (tyco, vs) end;
haftmann@35226
   422
    val (tyco, _) = last_typ (c, ty) ty_decl;
haftmann@35226
   423
    val (_, vs) = last_typ (c, ty) ty;
haftmann@35226
   424
  in ((tyco, map snd vs), (c, (map fst vs, ty))) end;
haftmann@35226
   425
haftmann@35226
   426
fun constrset_of_consts thy cs =
haftmann@35226
   427
  let
haftmann@35226
   428
    val _ = map (fn (c, _) => if (is_some o AxClass.class_of_param thy) c
haftmann@35226
   429
      then error ("Is a class parameter: " ^ string_of_const thy c) else ()) cs;
haftmann@31156
   430
    fun add ((tyco', sorts'), c) ((tyco, sorts), cs) =
haftmann@31156
   431
      let
haftmann@31998
   432
        val _ = if (tyco' : string) <> tyco
haftmann@31156
   433
          then error "Different type constructors in constructor set"
haftmann@31156
   434
          else ();
haftmann@40758
   435
        val sorts'' =
haftmann@40758
   436
          map2 (curry (Sorts.inter_sort (Sign.classes_of thy))) sorts' sorts
haftmann@40758
   437
      in ((tyco, sorts''), c :: cs) end;
haftmann@31156
   438
    fun inst vs' (c, (vs, ty)) =
haftmann@31156
   439
      let
haftmann@31156
   440
        val the_v = the o AList.lookup (op =) (vs ~~ vs');
haftmann@40803
   441
        val ty' = map_type_tfree (fn (v, _) => TFree (the_v v)) ty;
haftmann@40764
   442
        val (vs'', _) = logical_typscheme thy (c, ty');
wenzelm@40844
   443
      in (c, (vs'', binder_types ty')) end;
haftmann@40803
   444
    val c' :: cs' = map (analyze_constructor thy) cs;
haftmann@31156
   445
    val ((tyco, sorts), cs'') = fold add cs' (apsnd single c');
wenzelm@43329
   446
    val vs = Name.invent_names Name.context Name.aT sorts;
haftmann@31156
   447
    val cs''' = map (inst vs) cs'';
haftmann@31156
   448
  in (tyco, (vs, rev cs''')) end;
haftmann@31156
   449
haftmann@35299
   450
fun get_type_entry thy tyco = case these (Symtab.lookup ((the_types o the_exec) thy) tyco)
haftmann@35226
   451
 of (_, entry) :: _ => SOME entry
haftmann@35226
   452
  | _ => NONE;
haftmann@31962
   453
haftmann@40726
   454
fun get_type thy tyco = case get_type_entry thy tyco
haftmann@35226
   455
 of SOME (vs, spec) => apfst (pair vs) (constructors_of spec)
haftmann@35226
   456
  | NONE => arity_number thy tyco
wenzelm@43329
   457
      |> Name.invent Name.context Name.aT
haftmann@35226
   458
      |> map (rpair [])
haftmann@35226
   459
      |> rpair []
haftmann@35226
   460
      |> rpair false;
haftmann@35226
   461
haftmann@35299
   462
fun get_abstype_spec thy tyco = case get_type_entry thy tyco
haftmann@35226
   463
 of SOME (vs, Abstractor spec) => (vs, spec)
haftmann@36122
   464
  | _ => error ("Not an abstract type: " ^ tyco);
haftmann@35226
   465
 
haftmann@35299
   466
fun get_type_of_constr_or_abstr thy c =
wenzelm@40844
   467
  case (body_type o const_typ thy) c
haftmann@40758
   468
   of Type (tyco, _) => let val ((_, cos), abstract) = get_type thy tyco
haftmann@35226
   469
        in if member (op =) (map fst cos) c then SOME (tyco, abstract) else NONE end
haftmann@31962
   470
    | _ => NONE;
haftmann@31962
   471
haftmann@35299
   472
fun is_constr thy c = case get_type_of_constr_or_abstr thy c
haftmann@35226
   473
 of SOME (_, false) => true
haftmann@35226
   474
   | _ => false;
haftmann@35226
   475
haftmann@35299
   476
fun is_abstr thy c = case get_type_of_constr_or_abstr thy c
haftmann@35226
   477
 of SOME (_, true) => true
haftmann@35226
   478
   | _ => false;
haftmann@31962
   479
haftmann@31156
   480
haftmann@34874
   481
(* bare code equations *)
haftmann@31156
   482
haftmann@35226
   483
(* convention for variables:
haftmann@35226
   484
    ?x ?'a   for free-floating theorems (e.g. in the data store)
haftmann@35226
   485
    ?x  'a   for certificates
haftmann@35226
   486
     x  'a   for final representation of equations
haftmann@35226
   487
*)
haftmann@35226
   488
haftmann@31156
   489
exception BAD_THM of string;
haftmann@31156
   490
fun bad_thm msg = raise BAD_THM msg;
haftmann@31156
   491
fun error_thm f thm = f thm handle BAD_THM msg => error msg;
haftmann@31642
   492
fun warning_thm f thm = SOME (f thm) handle BAD_THM msg => (warning msg; NONE)
haftmann@31156
   493
fun try_thm f thm = SOME (f thm) handle BAD_THM _ => NONE;
haftmann@31156
   494
haftmann@31156
   495
fun is_linear thm =
haftmann@31156
   496
  let val (_, args) = (strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of) thm
haftmann@31156
   497
  in not (has_duplicates (op =) ((fold o fold_aterms)
haftmann@31156
   498
    (fn Var (v, _) => cons v | _ => I) args [])) end;
haftmann@31156
   499
haftmann@36209
   500
fun check_decl_ty thy (c, ty) =
haftmann@36209
   501
  let
haftmann@36209
   502
    val ty_decl = Sign.the_const_type thy c;
haftmann@36209
   503
  in if Sign.typ_equiv thy (Type.strip_sorts ty_decl, Type.strip_sorts ty) then ()
haftmann@36209
   504
    else bad_thm ("Type\n" ^ string_of_typ thy ty
haftmann@36209
   505
      ^ "\nof constant " ^ quote c
haftmann@40362
   506
      ^ "\nis too specific compared to declared type\n"
haftmann@36209
   507
      ^ string_of_typ thy ty_decl)
haftmann@36209
   508
  end; 
haftmann@36209
   509
haftmann@35226
   510
fun check_eqn thy { allow_nonlinear, allow_consts, allow_pats } thm (lhs, rhs) =
haftmann@31156
   511
  let
haftmann@34894
   512
    fun bad s = bad_thm (s ^ ":\n" ^ Display.string_of_thm_global thy thm);
haftmann@31156
   513
    fun vars_of t = fold_aterms (fn Var (v, _) => insert (op =) v
haftmann@34894
   514
      | Free _ => bad "Illegal free variable in equation"
haftmann@31156
   515
      | _ => I) t [];
haftmann@31156
   516
    fun tvars_of t = fold_term_types (fn _ =>
haftmann@31156
   517
      fold_atyps (fn TVar (v, _) => insert (op =) v
haftmann@34894
   518
        | TFree _ => bad "Illegal free type variable in equation")) t [];
haftmann@31156
   519
    val lhs_vs = vars_of lhs;
haftmann@31156
   520
    val rhs_vs = vars_of rhs;
haftmann@31156
   521
    val lhs_tvs = tvars_of lhs;
haftmann@31156
   522
    val rhs_tvs = tvars_of rhs;
haftmann@31156
   523
    val _ = if null (subtract (op =) lhs_vs rhs_vs)
haftmann@31156
   524
      then ()
haftmann@34894
   525
      else bad "Free variables on right hand side of equation";
haftmann@31156
   526
    val _ = if null (subtract (op =) lhs_tvs rhs_tvs)
haftmann@31156
   527
      then ()
haftmann@34894
   528
      else bad "Free type variables on right hand side of equation";
haftmann@34894
   529
    val (head, args) = strip_comb lhs;
haftmann@31156
   530
    val (c, ty) = case head
haftmann@31156
   531
     of Const (c_ty as (_, ty)) => (AxClass.unoverload_const thy c_ty, ty)
haftmann@34894
   532
      | _ => bad "Equation not headed by constant";
haftmann@34894
   533
    fun check _ (Abs _) = bad "Abstraction on left hand side of equation"
haftmann@31156
   534
      | check 0 (Var _) = ()
haftmann@34894
   535
      | check _ (Var _) = bad "Variable with application on left hand side of equation"
haftmann@31156
   536
      | check n (t1 $ t2) = (check (n+1) t1; check 0 t2)
haftmann@34894
   537
      | check n (Const (c_ty as (c, ty))) =
haftmann@35226
   538
          if allow_pats then let
haftmann@33940
   539
            val c' = AxClass.unoverload_const thy c_ty
wenzelm@40844
   540
          in if n = (length o binder_types o subst_signature thy c') ty
haftmann@35226
   541
            then if allow_consts orelse is_constr thy c'
haftmann@33940
   542
              then ()
haftmann@34894
   543
              else bad (quote c ^ " is not a constructor, on left hand side of equation")
haftmann@34894
   544
            else bad ("Partially applied constant " ^ quote c ^ " on left hand side of equation")
haftmann@36209
   545
          end else bad ("Pattern not allowed here, but constant " ^ quote c ^ " encountered on left hand side")
haftmann@31156
   546
    val _ = map (check 0) args;
haftmann@35226
   547
    val _ = if allow_nonlinear orelse is_linear thm then ()
haftmann@34894
   548
      else bad "Duplicate variables on left hand side of equation";
haftmann@34894
   549
    val _ = if (is_none o AxClass.class_of_param thy) c then ()
haftmann@34894
   550
      else bad "Overloaded constant as head in equation";
haftmann@34894
   551
    val _ = if not (is_constr thy c) then ()
haftmann@34894
   552
      else bad "Constructor as head in equation";
haftmann@35226
   553
    val _ = if not (is_abstr thy c) then ()
haftmann@35226
   554
      else bad "Abstractor as head in equation";
haftmann@36209
   555
    val _ = check_decl_ty thy (c, ty);
haftmann@35226
   556
  in () end;
haftmann@35226
   557
haftmann@35226
   558
fun gen_assert_eqn thy check_patterns (thm, proper) =
haftmann@35226
   559
  let
haftmann@35226
   560
    fun bad s = bad_thm (s ^ ":\n" ^ Display.string_of_thm_global thy thm);
haftmann@35226
   561
    val (lhs, rhs) = (Logic.dest_equals o Thm.plain_prop_of) thm
haftmann@35226
   562
      handle TERM _ => bad "Not an equation"
haftmann@35226
   563
           | THM _ => bad "Not a proper equation";
haftmann@35226
   564
    val _ = check_eqn thy { allow_nonlinear = not proper,
haftmann@35226
   565
      allow_consts = not (proper andalso check_patterns), allow_pats = true } thm (lhs, rhs);
haftmann@31156
   566
  in (thm, proper) end;
haftmann@31156
   567
haftmann@35226
   568
fun assert_abs_eqn thy some_tyco thm =
haftmann@35226
   569
  let
haftmann@35226
   570
    fun bad s = bad_thm (s ^ ":\n" ^ Display.string_of_thm_global thy thm);
haftmann@35226
   571
    val (full_lhs, rhs) = (Logic.dest_equals o Thm.plain_prop_of) thm
haftmann@35226
   572
      handle TERM _ => bad "Not an equation"
haftmann@35226
   573
           | THM _ => bad "Not a proper equation";
haftmann@35226
   574
    val (rep, lhs) = dest_comb full_lhs
haftmann@35226
   575
      handle TERM _ => bad "Not an abstract equation";
haftmann@36202
   576
    val (rep_const, ty) = dest_Const rep;
haftmann@40187
   577
    val (tyco, Ts) = (dest_Type o domain_type) ty
haftmann@39552
   578
      handle TERM _ => bad "Not an abstract equation"
haftmann@39552
   579
           | TYPE _ => bad "Not an abstract equation";
haftmann@35226
   580
    val _ = case some_tyco of SOME tyco' => if tyco = tyco' then ()
haftmann@35226
   581
          else bad ("Abstract type mismatch:" ^ quote tyco ^ " vs. " ^ quote tyco')
haftmann@35226
   582
      | NONE => ();
haftmann@36202
   583
    val (vs', (_, (rep', _))) = get_abstype_spec thy tyco;
haftmann@35226
   584
    val _ = if rep_const = rep' then ()
haftmann@35226
   585
      else bad ("Projection mismatch: " ^ quote rep_const ^ " vs. " ^ quote rep');
haftmann@35226
   586
    val _ = check_eqn thy { allow_nonlinear = false,
haftmann@35226
   587
      allow_consts = false, allow_pats = false } thm (lhs, rhs);
haftmann@40564
   588
    val _ = if forall2 (fn T => fn (_, sort) => Sign.of_sort thy (T, sort)) Ts vs' then ()
haftmann@40187
   589
      else error ("Type arguments do not satisfy sort constraints of abstype certificate.");
haftmann@35226
   590
  in (thm, tyco) end;
haftmann@35226
   591
haftmann@34894
   592
fun assert_eqn thy = error_thm (gen_assert_eqn thy true);
haftmann@31962
   593
wenzelm@42360
   594
fun meta_rewrite thy = Local_Defs.meta_rewrite_rule (Proof_Context.init_global thy);
haftmann@31156
   595
haftmann@34894
   596
fun mk_eqn thy = error_thm (gen_assert_eqn thy false) o
haftmann@31962
   597
  apfst (meta_rewrite thy);
haftmann@31962
   598
haftmann@31962
   599
fun mk_eqn_warning thy = Option.map (fn (thm, _) => (thm, is_linear thm))
haftmann@34894
   600
  o warning_thm (gen_assert_eqn thy false) o rpair false o meta_rewrite thy;
haftmann@31962
   601
haftmann@31962
   602
fun mk_eqn_liberal thy = Option.map (fn (thm, _) => (thm, is_linear thm))
haftmann@34894
   603
  o try_thm (gen_assert_eqn thy false) o rpair false o meta_rewrite thy;
haftmann@31156
   604
haftmann@35226
   605
fun mk_abs_eqn thy = error_thm (assert_abs_eqn thy NONE) o meta_rewrite thy;
haftmann@35226
   606
haftmann@33940
   607
val head_eqn = dest_Const o fst o strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of;
haftmann@31156
   608
haftmann@31957
   609
fun const_typ_eqn thy thm =
haftmann@31156
   610
  let
haftmann@32640
   611
    val (c, ty) = head_eqn thm;
haftmann@31156
   612
    val c' = AxClass.unoverload_const thy (c, ty);
haftmann@33940
   613
      (*permissive wrt. to overloaded constants!*)
haftmann@31156
   614
  in (c', ty) end;
haftmann@33940
   615
haftmann@31957
   616
fun const_eqn thy = fst o const_typ_eqn thy;
haftmann@31156
   617
haftmann@35226
   618
fun const_abs_eqn thy = AxClass.unoverload_const thy o dest_Const o fst o strip_comb o snd
haftmann@35226
   619
  o dest_comb o fst o Logic.dest_equals o Thm.plain_prop_of;
haftmann@35226
   620
haftmann@35226
   621
fun mk_proj tyco vs ty abs rep =
haftmann@35226
   622
  let
haftmann@35226
   623
    val ty_abs = Type (tyco, map TFree vs);
haftmann@35226
   624
    val xarg = Var (("x", 0), ty);
haftmann@35226
   625
  in Logic.mk_equals (Const (rep, ty_abs --> ty) $ (Const (abs, ty --> ty_abs) $ xarg), xarg) end;
haftmann@35226
   626
haftmann@34895
   627
haftmann@34895
   628
(* technical transformations of code equations *)
haftmann@34895
   629
haftmann@34895
   630
fun expand_eta thy k thm =
haftmann@34895
   631
  let
haftmann@34895
   632
    val (lhs, rhs) = (Logic.dest_equals o Thm.plain_prop_of) thm;
haftmann@34895
   633
    val (_, args) = strip_comb lhs;
haftmann@34895
   634
    val l = if k = ~1
haftmann@34895
   635
      then (length o fst o strip_abs) rhs
haftmann@34895
   636
      else Int.max (0, k - length args);
haftmann@34895
   637
    val (raw_vars, _) = Term.strip_abs_eta l rhs;
haftmann@34895
   638
    val vars = burrow_fst (Name.variant_list (map (fst o fst) (Term.add_vars lhs [])))
haftmann@34895
   639
      raw_vars;
haftmann@34895
   640
    fun expand (v, ty) thm = Drule.fun_cong_rule thm
haftmann@34895
   641
      (Thm.cterm_of thy (Var ((v, 0), ty)));
haftmann@34895
   642
  in
haftmann@34895
   643
    thm
haftmann@34895
   644
    |> fold expand vars
haftmann@34895
   645
    |> Conv.fconv_rule Drule.beta_eta_conversion
haftmann@34895
   646
  end;
haftmann@34895
   647
haftmann@34895
   648
fun same_arity thy thms =
haftmann@31962
   649
  let
haftmann@34895
   650
    val num_args_of = length o snd o strip_comb o fst o Logic.dest_equals;
haftmann@34895
   651
    val k = fold (Integer.max o num_args_of o Thm.prop_of) thms 0;
haftmann@34895
   652
  in map (expand_eta thy k) thms end;
haftmann@34895
   653
haftmann@34895
   654
fun mk_desymbolization pre post mk vs =
haftmann@34895
   655
  let
haftmann@34895
   656
    val names = map (pre o fst o fst) vs
haftmann@34895
   657
      |> map (Name.desymbolize false)
haftmann@34895
   658
      |> Name.variant_list []
haftmann@34895
   659
      |> map post;
haftmann@34895
   660
  in map_filter (fn (((v, i), x), v') =>
haftmann@34895
   661
    if v = v' andalso i = 0 then NONE
haftmann@34895
   662
    else SOME (((v, i), x), mk ((v', 0), x))) (vs ~~ names)
haftmann@34895
   663
  end;
haftmann@34895
   664
haftmann@40758
   665
fun desymbolize_tvars thms =
haftmann@34895
   666
  let
haftmann@34895
   667
    val tvs = fold (Term.add_tvars o Thm.prop_of) thms [];
haftmann@34895
   668
    val tvar_subst = mk_desymbolization (unprefix "'") (prefix "'") TVar tvs;
haftmann@34895
   669
  in map (Thm.certify_instantiate (tvar_subst, [])) thms end;
haftmann@34895
   670
haftmann@40758
   671
fun desymbolize_vars thm =
haftmann@34895
   672
  let
haftmann@34895
   673
    val vs = Term.add_vars (Thm.prop_of thm) [];
haftmann@34895
   674
    val var_subst = mk_desymbolization I I Var vs;
haftmann@34895
   675
  in Thm.certify_instantiate ([], var_subst) thm end;
haftmann@34895
   676
haftmann@40758
   677
fun canonize_thms thy = desymbolize_tvars #> same_arity thy #> map desymbolize_vars;
haftmann@31156
   678
haftmann@34874
   679
haftmann@36112
   680
(* abstype certificates *)
haftmann@36112
   681
haftmann@36112
   682
fun check_abstype_cert thy proto_thm =
haftmann@36112
   683
  let
haftmann@36209
   684
    val thm = (AxClass.unoverload thy o meta_rewrite thy) proto_thm;
haftmann@36112
   685
    fun bad s = bad_thm (s ^ ":\n" ^ Display.string_of_thm_global thy thm);
haftmann@36112
   686
    val (lhs, rhs) = Logic.dest_equals (Thm.plain_prop_of thm)
haftmann@36112
   687
      handle TERM _ => bad "Not an equation"
haftmann@36112
   688
           | THM _ => bad "Not a proper equation";
haftmann@36209
   689
    val ((abs, raw_ty), ((rep, rep_ty), param)) = (apsnd (apfst dest_Const o dest_comb)
haftmann@36112
   690
        o apfst dest_Const o dest_comb) lhs
haftmann@36112
   691
      handle TERM _ => bad "Not an abstype certificate";
haftmann@36209
   692
    val _ = pairself (fn c => if (is_some o AxClass.class_of_param thy) c
haftmann@36209
   693
      then error ("Is a class parameter: " ^ string_of_const thy c) else ()) (abs, rep);
haftmann@36209
   694
    val _ = check_decl_ty thy (abs, raw_ty);
haftmann@36209
   695
    val _ = check_decl_ty thy (rep, rep_ty);
haftmann@40758
   696
    val _ = (fst o dest_Var) param
haftmann@36112
   697
      handle TERM _ => bad "Not an abstype certificate";
haftmann@36112
   698
    val _ = if param = rhs then () else bad "Not an abstype certificate";
wenzelm@45344
   699
    val ((tyco, sorts), (abs, (vs, ty'))) =
wenzelm@45344
   700
      analyze_constructor thy (abs, Logic.unvarifyT_global raw_ty);
haftmann@36112
   701
    val ty = domain_type ty';
haftmann@40764
   702
    val (vs', _) = logical_typscheme thy (abs, ty');
haftmann@40726
   703
  in (tyco, (vs ~~ sorts, ((abs, (vs', ty)), (rep, thm)))) end;
haftmann@36112
   704
haftmann@36112
   705
haftmann@34874
   706
(* code equation certificates *)
haftmann@34874
   707
haftmann@34895
   708
fun build_head thy (c, ty) =
haftmann@34895
   709
  Thm.cterm_of thy (Logic.mk_equals (Free ("HEAD", ty), Const (c, ty)));
haftmann@34874
   710
haftmann@34895
   711
fun get_head thy cert_thm =
haftmann@34895
   712
  let
haftmann@34895
   713
    val [head] = (#hyps o Thm.crep_thm) cert_thm;
haftmann@34895
   714
    val (_, Const (c, ty)) = (Logic.dest_equals o Thm.term_of) head;
haftmann@34895
   715
  in (typscheme thy (c, ty), head) end;
haftmann@34895
   716
haftmann@35226
   717
fun typscheme_projection thy =
haftmann@35226
   718
  typscheme thy o dest_Const o fst o dest_comb o fst o Logic.dest_equals;
haftmann@35226
   719
haftmann@35226
   720
fun typscheme_abs thy =
haftmann@35226
   721
  typscheme thy o dest_Const o fst o strip_comb o snd o dest_comb o fst o Logic.dest_equals o Thm.prop_of;
haftmann@35226
   722
haftmann@35226
   723
fun constrain_thm thy vs sorts thm =
haftmann@35226
   724
  let
haftmann@35226
   725
    val mapping = map2 (fn (v, sort) => fn sort' =>
haftmann@35226
   726
      (v, Sorts.inter_sort (Sign.classes_of thy) (sort, sort'))) vs sorts;
haftmann@35226
   727
    val inst = map2 (fn (v, sort) => fn (_, sort') =>
haftmann@35226
   728
      (((v, 0), sort), TFree (v, sort'))) vs mapping;
haftmann@40803
   729
    val subst = (map_types o map_type_tfree)
haftmann@40803
   730
      (fn (v, _) => TFree (v, the (AList.lookup (op =) mapping v)));
haftmann@35226
   731
  in
haftmann@35226
   732
    thm
wenzelm@35845
   733
    |> Thm.varifyT_global
haftmann@35226
   734
    |> Thm.certify_instantiate (inst, [])
haftmann@35226
   735
    |> pair subst
haftmann@35226
   736
  end;
haftmann@35226
   737
haftmann@35226
   738
fun concretify_abs thy tyco abs_thm =
haftmann@35226
   739
  let
haftmann@40758
   740
    val (_, ((c, _), (_, cert))) = get_abstype_spec thy tyco;
haftmann@35226
   741
    val lhs = (fst o Logic.dest_equals o Thm.prop_of) abs_thm
haftmann@35226
   742
    val ty = fastype_of lhs;
haftmann@35226
   743
    val ty_abs = (fastype_of o snd o dest_comb) lhs;
haftmann@35226
   744
    val abs = Thm.cterm_of thy (Const (c, ty --> ty_abs));
haftmann@35226
   745
    val raw_concrete_thm = Drule.transitive_thm OF [Thm.symmetric cert, Thm.combination (Thm.reflexive abs) abs_thm];
wenzelm@35845
   746
  in (c, (Thm.varifyT_global o zero_var_indexes) raw_concrete_thm) end;
haftmann@35226
   747
haftmann@35226
   748
fun add_rhss_of_eqn thy t =
haftmann@35226
   749
  let
haftmann@35226
   750
    val (args, rhs) = (apfst (snd o strip_comb) o Logic.dest_equals o subst_signatures thy) t;
haftmann@35226
   751
    fun add_const (Const (c, ty)) = insert (op =) (c, Sign.const_typargs thy (c, ty))
haftmann@35226
   752
      | add_const _ = I
haftmann@39568
   753
    val add_consts = fold_aterms add_const
haftmann@39568
   754
  in add_consts rhs o fold add_consts args end;
haftmann@35226
   755
wenzelm@35845
   756
fun dest_eqn thy =
wenzelm@35845
   757
  apfst (snd o strip_comb) o Logic.dest_equals o subst_signatures thy o Logic.unvarify_global;
haftmann@35226
   758
haftmann@35226
   759
abstype cert = Equations of thm * bool list
haftmann@35226
   760
  | Projection of term * string
haftmann@35226
   761
  | Abstract of thm * string
haftmann@35226
   762
with
haftmann@34891
   763
haftmann@34891
   764
fun empty_cert thy c = 
haftmann@34891
   765
  let
haftmann@40761
   766
    val raw_ty = Logic.unvarifyT_global (const_typ thy c);
haftmann@40764
   767
    val (vs, _) = logical_typscheme thy (c, raw_ty);
haftmann@40761
   768
    val sortargs = case AxClass.class_of_param thy c
haftmann@40761
   769
     of SOME class => [[class]]
haftmann@40761
   770
      | NONE => (case get_type_of_constr_or_abstr thy c
haftmann@40761
   771
         of SOME (tyco, _) => (map snd o fst o the)
haftmann@40761
   772
              (AList.lookup (op =) ((snd o fst o get_type thy) tyco) c)
haftmann@40761
   773
          | NONE => replicate (length vs) []);
haftmann@40761
   774
    val the_sort = the o AList.lookup (op =) (map fst vs ~~ sortargs);
haftmann@40761
   775
    val ty = map_type_tfree (fn (v, _) => TFree (v, the_sort v)) raw_ty
haftmann@34895
   776
    val chead = build_head thy (c, ty);
haftmann@35226
   777
  in Equations (Thm.weaken chead Drule.dummy_thm, []) end;
haftmann@34891
   778
haftmann@34891
   779
fun cert_of_eqns thy c [] = empty_cert thy c
haftmann@34895
   780
  | cert_of_eqns thy c raw_eqns = 
haftmann@34874
   781
      let
haftmann@34895
   782
        val eqns = burrow_fst (canonize_thms thy) raw_eqns;
haftmann@34895
   783
        val _ = map (assert_eqn thy) eqns;
haftmann@34891
   784
        val (thms, propers) = split_list eqns;
haftmann@34895
   785
        val _ = map (fn thm => if c = const_eqn thy thm then ()
haftmann@34895
   786
          else error ("Wrong head of code equation,\nexpected constant "
haftmann@34895
   787
            ^ string_of_const thy c ^ "\n" ^ Display.string_of_thm_global thy thm)) thms;
haftmann@34891
   788
        fun tvars_of T = rev (Term.add_tvarsT T []);
haftmann@34891
   789
        val vss = map (tvars_of o snd o head_eqn) thms;
haftmann@34891
   790
        fun inter_sorts vs =
haftmann@34891
   791
          fold (curry (Sorts.inter_sort (Sign.classes_of thy)) o snd) vs [];
haftmann@34891
   792
        val sorts = map_transpose inter_sorts vss;
wenzelm@43329
   793
        val vts = Name.invent_names Name.context Name.aT sorts;
haftmann@40758
   794
        val thms' =
haftmann@34891
   795
          map2 (fn vs => Thm.certify_instantiate (vs ~~ map TFree vts, [])) vss thms;
haftmann@40758
   796
        val head_thm = Thm.symmetric (Thm.assume (build_head thy (head_eqn (hd thms'))));
haftmann@34874
   797
        fun head_conv ct = if can Thm.dest_comb ct
haftmann@34874
   798
          then Conv.fun_conv head_conv ct
haftmann@34874
   799
          else Conv.rewr_conv head_thm ct;
haftmann@34874
   800
        val rewrite_head = Conv.fconv_rule (Conv.arg1_conv head_conv);
haftmann@40758
   801
        val cert_thm = Conjunction.intr_balanced (map rewrite_head thms');
haftmann@35226
   802
      in Equations (cert_thm, propers) end;
haftmann@34891
   803
haftmann@35226
   804
fun cert_of_proj thy c tyco =
haftmann@35226
   805
  let
haftmann@40758
   806
    val (vs, ((abs, (_, ty)), (rep, _))) = get_abstype_spec thy tyco;
haftmann@35226
   807
    val _ = if c = rep then () else
haftmann@35226
   808
      error ("Wrong head of projection,\nexpected constant " ^ string_of_const thy rep);
haftmann@35226
   809
  in Projection (mk_proj tyco vs ty abs rep, tyco) end;
haftmann@35226
   810
haftmann@35226
   811
fun cert_of_abs thy tyco c raw_abs_thm =
haftmann@34874
   812
  let
haftmann@35226
   813
    val abs_thm = singleton (canonize_thms thy) raw_abs_thm;
haftmann@35226
   814
    val _ = assert_abs_eqn thy (SOME tyco) abs_thm;
haftmann@35226
   815
    val _ = if c = const_abs_eqn thy abs_thm then ()
haftmann@35226
   816
      else error ("Wrong head of abstract code equation,\nexpected constant "
haftmann@35226
   817
        ^ string_of_const thy c ^ "\n" ^ Display.string_of_thm_global thy abs_thm);
wenzelm@36615
   818
  in Abstract (Thm.legacy_freezeT abs_thm, tyco) end;
haftmann@34874
   819
haftmann@35226
   820
fun constrain_cert thy sorts (Equations (cert_thm, propers)) =
haftmann@35226
   821
      let
haftmann@35226
   822
        val ((vs, _), head) = get_head thy cert_thm;
haftmann@35226
   823
        val (subst, cert_thm') = cert_thm
haftmann@35226
   824
          |> Thm.implies_intr head
haftmann@35226
   825
          |> constrain_thm thy vs sorts;
haftmann@35226
   826
        val head' = Thm.term_of head
haftmann@35226
   827
          |> subst
haftmann@35226
   828
          |> Thm.cterm_of thy;
haftmann@35226
   829
        val cert_thm'' = cert_thm'
haftmann@35226
   830
          |> Thm.elim_implies (Thm.assume head');
haftmann@35226
   831
      in Equations (cert_thm'', propers) end
haftmann@35226
   832
  | constrain_cert thy _ (cert as Projection _) =
haftmann@35226
   833
      cert
haftmann@35226
   834
  | constrain_cert thy sorts (Abstract (abs_thm, tyco)) =
haftmann@35226
   835
      Abstract (snd (constrain_thm thy (fst (typscheme_abs thy abs_thm)) sorts abs_thm), tyco);
haftmann@35226
   836
haftmann@35226
   837
fun typscheme_of_cert thy (Equations (cert_thm, _)) =
haftmann@35226
   838
      fst (get_head thy cert_thm)
haftmann@35226
   839
  | typscheme_of_cert thy (Projection (proj, _)) =
haftmann@35226
   840
      typscheme_projection thy proj
haftmann@35226
   841
  | typscheme_of_cert thy (Abstract (abs_thm, _)) =
haftmann@35226
   842
      typscheme_abs thy abs_thm;
haftmann@34874
   843
haftmann@35226
   844
fun typargs_deps_of_cert thy (Equations (cert_thm, propers)) =
haftmann@35226
   845
      let
haftmann@35226
   846
        val vs = (fst o fst) (get_head thy cert_thm);
haftmann@35226
   847
        val equations = if null propers then [] else
haftmann@35226
   848
          Thm.prop_of cert_thm
haftmann@35226
   849
          |> Logic.dest_conjunction_balanced (length propers);
haftmann@35226
   850
      in (vs, fold (add_rhss_of_eqn thy) equations []) end
haftmann@40758
   851
  | typargs_deps_of_cert thy (Projection (t, _)) =
haftmann@35226
   852
      (fst (typscheme_projection thy t), add_rhss_of_eqn thy t [])
haftmann@35226
   853
  | typargs_deps_of_cert thy (Abstract (abs_thm, tyco)) =
haftmann@35226
   854
      let
haftmann@35226
   855
        val vs = fst (typscheme_abs thy abs_thm);
haftmann@35226
   856
        val (_, concrete_thm) = concretify_abs thy tyco abs_thm;
wenzelm@45344
   857
      in (vs, add_rhss_of_eqn thy (Logic.unvarify_types_global (Thm.prop_of concrete_thm)) []) end;
haftmann@34895
   858
haftmann@35226
   859
fun equations_of_cert thy (cert as Equations (cert_thm, propers)) =
haftmann@35226
   860
      let
haftmann@35226
   861
        val tyscm = typscheme_of_cert thy cert;
haftmann@35226
   862
        val thms = if null propers then [] else
haftmann@35226
   863
          cert_thm
wenzelm@35624
   864
          |> Local_Defs.expand [snd (get_head thy cert_thm)]
wenzelm@35845
   865
          |> Thm.varifyT_global
haftmann@35226
   866
          |> Conjunction.elim_balanced (length propers);
haftmann@36209
   867
        fun abstractions (args, rhs) = (map (rpair NONE) args, (rhs, NONE));
haftmann@36209
   868
      in (tyscm, map (abstractions o dest_eqn thy o Thm.prop_of) thms ~~ (map SOME thms ~~ propers)) end
haftmann@35226
   869
  | equations_of_cert thy (Projection (t, tyco)) =
haftmann@35226
   870
      let
haftmann@35226
   871
        val (_, ((abs, _), _)) = get_abstype_spec thy tyco;
haftmann@35226
   872
        val tyscm = typscheme_projection thy t;
wenzelm@45344
   873
        val t' = Logic.varify_types_global t;
haftmann@36209
   874
        fun abstractions (args, rhs) = (map (rpair (SOME abs)) args, (rhs, NONE));
haftmann@36209
   875
      in (tyscm, [((abstractions o dest_eqn thy) t', (NONE, true))]) end
haftmann@35226
   876
  | equations_of_cert thy (Abstract (abs_thm, tyco)) =
haftmann@35226
   877
      let
haftmann@35226
   878
        val tyscm = typscheme_abs thy abs_thm;
haftmann@35226
   879
        val (abs, concrete_thm) = concretify_abs thy tyco abs_thm;
haftmann@36209
   880
        fun abstractions (args, rhs) = (map (rpair NONE) args, (rhs, (SOME abs)));
wenzelm@35845
   881
      in
haftmann@36209
   882
        (tyscm, [((abstractions o dest_eqn thy o Thm.prop_of) concrete_thm,
haftmann@36209
   883
          (SOME (Thm.varifyT_global abs_thm), true))])
wenzelm@35845
   884
      end;
haftmann@34895
   885
haftmann@35226
   886
fun pretty_cert thy (cert as Equations _) =
haftmann@35226
   887
      (map_filter (Option.map (Display.pretty_thm_global thy o AxClass.overload thy) o fst o snd)
haftmann@35226
   888
         o snd o equations_of_cert thy) cert
haftmann@35226
   889
  | pretty_cert thy (Projection (t, _)) =
wenzelm@45344
   890
      [Syntax.pretty_term_global thy (Logic.varify_types_global t)]
haftmann@40758
   891
  | pretty_cert thy (Abstract (abs_thm, _)) =
wenzelm@35845
   892
      [(Display.pretty_thm_global thy o AxClass.overload thy o Thm.varifyT_global) abs_thm];
haftmann@35226
   893
haftmann@35226
   894
fun bare_thms_of_cert thy (cert as Equations _) =
haftmann@35226
   895
      (map_filter (fn (_, (some_thm, proper)) => if proper then some_thm else NONE)
haftmann@35226
   896
        o snd o equations_of_cert thy) cert
haftmann@35376
   897
  | bare_thms_of_cert thy (Projection _) = []
haftmann@35376
   898
  | bare_thms_of_cert thy (Abstract (abs_thm, tyco)) =
wenzelm@35845
   899
      [Thm.varifyT_global (snd (concretify_abs thy tyco abs_thm))];
haftmann@34895
   900
haftmann@34895
   901
end;
haftmann@34891
   902
haftmann@34874
   903
haftmann@35226
   904
(* code certificate access *)
haftmann@35226
   905
haftmann@35226
   906
fun retrieve_raw thy c =
haftmann@35226
   907
  Symtab.lookup ((the_functions o the_exec) thy) c
haftmann@35226
   908
  |> Option.map (snd o fst)
haftmann@37460
   909
  |> the_default empty_fun_spec
haftmann@34874
   910
haftmann@35226
   911
fun get_cert thy f c = case retrieve_raw thy c
haftmann@37460
   912
 of Default (_, eqns_lazy) => Lazy.force eqns_lazy
haftmann@35226
   913
      |> (map o apfst) (Thm.transfer thy)
haftmann@35226
   914
      |> f
haftmann@35226
   915
      |> (map o apfst) (AxClass.unoverload thy)
haftmann@35226
   916
      |> cert_of_eqns thy c
haftmann@35226
   917
  | Eqns eqns => eqns
haftmann@35226
   918
      |> (map o apfst) (Thm.transfer thy)
haftmann@35226
   919
      |> f
haftmann@35226
   920
      |> (map o apfst) (AxClass.unoverload thy)
haftmann@35226
   921
      |> cert_of_eqns thy c
haftmann@35226
   922
  | Proj (_, tyco) =>
haftmann@35226
   923
      cert_of_proj thy c tyco
haftmann@35226
   924
  | Abstr (abs_thm, tyco) => abs_thm
haftmann@35226
   925
      |> Thm.transfer thy
haftmann@35226
   926
      |> AxClass.unoverload thy
haftmann@35226
   927
      |> cert_of_abs thy tyco c;
haftmann@31962
   928
haftmann@31962
   929
haftmann@31962
   930
(* cases *)
haftmann@31156
   931
haftmann@31156
   932
fun case_certificate thm =
haftmann@31156
   933
  let
haftmann@31156
   934
    val ((head, raw_case_expr), cases) = (apfst Logic.dest_equals
haftmann@32640
   935
      o apsnd Logic.dest_conjunctions o Logic.dest_implies o Thm.plain_prop_of) thm;
haftmann@31156
   936
    val _ = case head of Free _ => true
haftmann@31156
   937
      | Var _ => true
haftmann@31156
   938
      | _ => raise TERM ("case_cert", []);
haftmann@31156
   939
    val ([(case_var, _)], case_expr) = Term.strip_abs_eta 1 raw_case_expr;
haftmann@31156
   940
    val (Const (case_const, _), raw_params) = strip_comb case_expr;
haftmann@31156
   941
    val n = find_index (fn Free (v, _) => v = case_var | _ => false) raw_params;
haftmann@31156
   942
    val _ = if n = ~1 then raise TERM ("case_cert", []) else ();
haftmann@31156
   943
    val params = map (fst o dest_Var) (nth_drop n raw_params);
haftmann@31156
   944
    fun dest_case t =
haftmann@31156
   945
      let
haftmann@31156
   946
        val (head' $ t_co, rhs) = Logic.dest_equals t;
haftmann@31156
   947
        val _ = if head' = head then () else raise TERM ("case_cert", []);
haftmann@31156
   948
        val (Const (co, _), args) = strip_comb t_co;
haftmann@31156
   949
        val (Var (param, _), args') = strip_comb rhs;
haftmann@31156
   950
        val _ = if args' = args then () else raise TERM ("case_cert", []);
haftmann@31156
   951
      in (param, co) end;
haftmann@31156
   952
    fun analyze_cases cases =
haftmann@31156
   953
      let
haftmann@31156
   954
        val co_list = fold (AList.update (op =) o dest_case) cases [];
haftmann@31156
   955
      in map (the o AList.lookup (op =) co_list) params end;
haftmann@31156
   956
    fun analyze_let t =
haftmann@31156
   957
      let
haftmann@31156
   958
        val (head' $ arg, Var (param', _) $ arg') = Logic.dest_equals t;
haftmann@31156
   959
        val _ = if head' = head then () else raise TERM ("case_cert", []);
haftmann@31156
   960
        val _ = if arg' = arg then () else raise TERM ("case_cert", []);
haftmann@31156
   961
        val _ = if [param'] = params then () else raise TERM ("case_cert", []);
haftmann@31156
   962
      in [] end;
haftmann@31156
   963
    fun analyze (cases as [let_case]) =
haftmann@31156
   964
          (analyze_cases cases handle Bind => analyze_let let_case)
haftmann@31156
   965
      | analyze cases = analyze_cases cases;
haftmann@31156
   966
  in (case_const, (n, analyze cases)) end;
haftmann@31156
   967
haftmann@31156
   968
fun case_cert thm = case_certificate thm
haftmann@31156
   969
  handle Bind => error "bad case certificate"
haftmann@31156
   970
       | TERM _ => error "bad case certificate";
haftmann@31156
   971
haftmann@37438
   972
fun get_case_scheme thy = Option.map fst o Symtab.lookup ((fst o the_cases o the_exec) thy);
haftmann@37438
   973
fun get_case_cong thy = Option.map snd o Symtab.lookup ((fst o the_cases o the_exec) thy);
haftmann@24219
   974
haftmann@31962
   975
val undefineds = Symtab.keys o snd o the_cases o the_exec;
haftmann@24219
   976
haftmann@24219
   977
haftmann@31962
   978
(* diagnostic *)
haftmann@24219
   979
haftmann@24219
   980
fun print_codesetup thy =
haftmann@24219
   981
  let
wenzelm@42360
   982
    val ctxt = Proof_Context.init_global thy;
haftmann@24844
   983
    val exec = the_exec thy;
haftmann@35226
   984
    fun pretty_equations const thms =
haftmann@24219
   985
      (Pretty.block o Pretty.fbreaks) (
haftmann@35226
   986
        Pretty.str (string_of_const thy const) :: map (Display.pretty_thm ctxt) thms
haftmann@24219
   987
      );
haftmann@37460
   988
    fun pretty_function (const, Default (_, eqns_lazy)) = pretty_equations const (map fst (Lazy.force eqns_lazy))
haftmann@35226
   989
      | pretty_function (const, Eqns eqns) = pretty_equations const (map fst eqns)
haftmann@35226
   990
      | pretty_function (const, Proj (proj, _)) = Pretty.block
haftmann@35226
   991
          [Pretty.str (string_of_const thy const), Pretty.fbrk, Syntax.pretty_term ctxt proj]
haftmann@35226
   992
      | pretty_function (const, Abstr (thm, _)) = pretty_equations const [thm];
haftmann@35226
   993
    fun pretty_typ (tyco, vs) = Pretty.str
haftmann@35226
   994
      (string_of_typ thy (Type (tyco, map TFree vs)));
haftmann@35226
   995
    fun pretty_typspec (typ, (cos, abstract)) = if null cos
haftmann@35226
   996
      then pretty_typ typ
haftmann@35226
   997
      else (Pretty.block o Pretty.breaks) (
haftmann@35226
   998
        pretty_typ typ
haftmann@35226
   999
        :: Pretty.str "="
haftmann@35226
  1000
        :: (if abstract then [Pretty.str "(abstract)"] else [])
haftmann@40726
  1001
        @ separate (Pretty.str "|") (map (fn (c, (_, [])) => Pretty.str (string_of_const thy c)
haftmann@40726
  1002
             | (c, (_, tys)) =>
haftmann@35226
  1003
                 (Pretty.block o Pretty.breaks)
haftmann@35226
  1004
                    (Pretty.str (string_of_const thy c)
haftmann@35226
  1005
                      :: Pretty.str "of"
haftmann@35226
  1006
                      :: map (Pretty.quote o Syntax.pretty_typ_global thy) tys)) cos)
haftmann@35226
  1007
      );
haftmann@37438
  1008
    fun pretty_case (const, ((_, (_, [])), _)) = Pretty.str (string_of_const thy const)
haftmann@37438
  1009
      | pretty_case (const, ((_, (_, cos)), _)) = (Pretty.block o Pretty.breaks) [
haftmann@34901
  1010
          Pretty.str (string_of_const thy const), Pretty.str "with",
haftmann@34901
  1011
          (Pretty.block o Pretty.commas o map (Pretty.str o string_of_const thy)) cos];
haftmann@35226
  1012
    val functions = the_functions exec
haftmann@24423
  1013
      |> Symtab.dest
haftmann@28695
  1014
      |> (map o apsnd) (snd o fst)
haftmann@24219
  1015
      |> sort (string_ord o pairself fst);
haftmann@35299
  1016
    val datatypes = the_types exec
haftmann@24219
  1017
      |> Symtab.dest
haftmann@35226
  1018
      |> map (fn (tyco, (_, (vs, spec)) :: _) =>
haftmann@35226
  1019
          ((tyco, vs), constructors_of spec))
haftmann@35226
  1020
      |> sort (string_ord o pairself (fst o fst));
haftmann@34901
  1021
    val cases = Symtab.dest ((fst o the_cases o the_exec) thy);
haftmann@34901
  1022
    val undefineds = Symtab.keys ((snd o the_cases o the_exec) thy);
haftmann@24219
  1023
  in
haftmann@24219
  1024
    (Pretty.writeln o Pretty.chunks) [
haftmann@24219
  1025
      Pretty.block (
haftmann@34901
  1026
        Pretty.str "code equations:" :: Pretty.fbrk
haftmann@35226
  1027
        :: (Pretty.fbreaks o map pretty_function) functions
haftmann@24219
  1028
      ),
haftmann@25968
  1029
      Pretty.block (
haftmann@34901
  1030
        Pretty.str "datatypes:" :: Pretty.fbrk
haftmann@35226
  1031
        :: (Pretty.fbreaks o map pretty_typspec) datatypes
haftmann@34901
  1032
      ),
haftmann@34901
  1033
      Pretty.block (
haftmann@34901
  1034
        Pretty.str "cases:" :: Pretty.fbrk
haftmann@34901
  1035
        :: (Pretty.fbreaks o map pretty_case) cases
haftmann@34901
  1036
      ),
haftmann@34901
  1037
      Pretty.block (
haftmann@34901
  1038
        Pretty.str "undefined:" :: Pretty.fbrk
haftmann@34901
  1039
        :: (Pretty.commas o map (Pretty.str o string_of_const thy)) undefineds
haftmann@24219
  1040
      )
haftmann@24219
  1041
    ]
haftmann@24219
  1042
  end;
haftmann@24219
  1043
haftmann@24219
  1044
haftmann@31962
  1045
(** declaring executable ingredients **)
haftmann@31962
  1046
haftmann@33940
  1047
(* constant signatures *)
haftmann@33940
  1048
haftmann@33940
  1049
fun add_type tyco thy =
haftmann@33940
  1050
  case Symtab.lookup ((snd o #types o Type.rep_tsig o Sign.tsig_of) thy) tyco
haftmann@33940
  1051
   of SOME (Type.Abbreviation (vs, _, _)) =>
haftmann@34173
  1052
          (map_exec_purge o map_signatures o apfst)
haftmann@33940
  1053
            (Symtab.update (tyco, length vs)) thy
haftmann@33940
  1054
    | _ => error ("No such type abbreviation: " ^ quote tyco);
haftmann@33940
  1055
haftmann@33940
  1056
fun add_type_cmd s thy = add_type (Sign.intern_type thy s) thy;
haftmann@33940
  1057
haftmann@33940
  1058
fun gen_add_signature prep_const prep_signature (raw_c, raw_ty) thy =
haftmann@33940
  1059
  let
haftmann@33940
  1060
    val c = prep_const thy raw_c;
haftmann@33940
  1061
    val ty = prep_signature thy raw_ty;
haftmann@33940
  1062
    val ty' = expand_signature thy ty;
haftmann@33940
  1063
    val ty'' = Sign.the_const_type thy c;
haftmann@33940
  1064
    val _ = if typ_equiv (ty', ty'') then () else
haftmann@33940
  1065
      error ("Illegal constant signature: " ^ Syntax.string_of_typ_global thy ty);
haftmann@33940
  1066
  in
haftmann@33940
  1067
    thy
haftmann@34173
  1068
    |> (map_exec_purge o map_signatures o apsnd) (Symtab.update (c, ty))
haftmann@33940
  1069
  end;
haftmann@33940
  1070
haftmann@33940
  1071
val add_signature = gen_add_signature (K I) cert_signature;
haftmann@33940
  1072
val add_signature_cmd = gen_add_signature read_const read_signature;
haftmann@33940
  1073
haftmann@33940
  1074
haftmann@31962
  1075
(* code equations *)
haftmann@31962
  1076
haftmann@35226
  1077
fun gen_add_eqn default (raw_thm, proper) thy =
haftmann@33075
  1078
  let
haftmann@35226
  1079
    val thm = Thm.close_derivation raw_thm;
haftmann@35226
  1080
    val c = const_eqn thy thm;
haftmann@37460
  1081
    fun update_subsume thy (thm, proper) eqns = 
haftmann@37460
  1082
      let
haftmann@39811
  1083
        val args_of = snd o chop_while is_Var o rev o snd o strip_comb
haftmann@39791
  1084
          o map_types Type.strip_sorts o fst o Logic.dest_equals o Thm.plain_prop_of;
haftmann@37460
  1085
        val args = args_of thm;
haftmann@37460
  1086
        val incr_idx = Logic.incr_indexes ([], Thm.maxidx_of thm + 1);
haftmann@39794
  1087
        fun matches_args args' =
haftmann@39794
  1088
          let
haftmann@39794
  1089
            val k = length args' - length args
haftmann@39794
  1090
          in if k >= 0
haftmann@39794
  1091
            then Pattern.matchess thy (args, (map incr_idx o drop k) args')
haftmann@39794
  1092
            else false
haftmann@39794
  1093
          end;
haftmann@37460
  1094
        fun drop (thm', proper') = if (proper orelse not proper')
haftmann@37460
  1095
          andalso matches_args (args_of thm') then 
haftmann@37460
  1096
            (warning ("Code generator: dropping subsumed code equation\n" ^
haftmann@37460
  1097
                Display.string_of_thm_global thy thm'); true)
haftmann@37460
  1098
          else false;
haftmann@37460
  1099
      in (thm, proper) :: filter_out drop eqns end;
haftmann@37460
  1100
    fun natural_order thy_ref eqns =
haftmann@37460
  1101
      (eqns, Lazy.lazy (fn () => fold (update_subsume (Theory.deref thy_ref)) eqns []))
haftmann@37460
  1102
    fun add_eqn' true (Default (eqns, _)) =
haftmann@37460
  1103
          Default (natural_order (Theory.check_thy thy) ((thm, proper) :: eqns))
haftmann@37460
  1104
          (*this restores the natural order and drops syntactic redundancies*)
haftmann@39794
  1105
      | add_eqn' true fun_spec = fun_spec
haftmann@39794
  1106
      | add_eqn' false (Eqns eqns) = Eqns (update_subsume thy (thm, proper) eqns)
haftmann@35226
  1107
      | add_eqn' false _ = Eqns [(thm, proper)];
haftmann@35226
  1108
  in change_fun_spec false c (add_eqn' default) thy end;
haftmann@31962
  1109
haftmann@31962
  1110
fun add_eqn thm thy =
haftmann@31962
  1111
  gen_add_eqn false (mk_eqn thy (thm, true)) thy;
haftmann@31962
  1112
haftmann@31962
  1113
fun add_warning_eqn thm thy =
haftmann@31962
  1114
  case mk_eqn_warning thy thm
haftmann@31962
  1115
   of SOME eqn => gen_add_eqn false eqn thy
haftmann@31962
  1116
    | NONE => thy;
haftmann@31962
  1117
haftmann@37425
  1118
fun add_nbe_eqn thm thy =
haftmann@37425
  1119
  gen_add_eqn false (mk_eqn thy (thm, false)) thy;
haftmann@37425
  1120
haftmann@31962
  1121
fun add_default_eqn thm thy =
haftmann@31962
  1122
  case mk_eqn_liberal thy thm
haftmann@31962
  1123
   of SOME eqn => gen_add_eqn true eqn thy
haftmann@31962
  1124
    | NONE => thy;
haftmann@31962
  1125
haftmann@31962
  1126
val add_default_eqn_attribute = Thm.declaration_attribute
haftmann@31962
  1127
  (fn thm => Context.mapping (add_default_eqn thm) I);
haftmann@31962
  1128
val add_default_eqn_attrib = Attrib.internal (K add_default_eqn_attribute);
haftmann@31962
  1129
haftmann@37425
  1130
fun add_nbe_default_eqn thm thy =
haftmann@37425
  1131
  gen_add_eqn true (mk_eqn thy (thm, false)) thy;
haftmann@37425
  1132
haftmann@37425
  1133
val add_nbe_default_eqn_attribute = Thm.declaration_attribute
haftmann@37425
  1134
  (fn thm => Context.mapping (add_nbe_default_eqn thm) I);
haftmann@37425
  1135
val add_nbe_default_eqn_attrib = Attrib.internal (K add_nbe_default_eqn_attribute);
haftmann@37425
  1136
haftmann@35226
  1137
fun add_abs_eqn raw_thm thy =
haftmann@35226
  1138
  let
haftmann@35226
  1139
    val (abs_thm, tyco) = (apfst Thm.close_derivation o mk_abs_eqn thy) raw_thm;
haftmann@35226
  1140
    val c = const_abs_eqn thy abs_thm;
haftmann@35226
  1141
  in change_fun_spec false c (K (Abstr (abs_thm, tyco))) thy end;
haftmann@35226
  1142
haftmann@31962
  1143
fun del_eqn thm thy = case mk_eqn_liberal thy thm
haftmann@35226
  1144
 of SOME (thm, _) => let
haftmann@40758
  1145
        fun del_eqn' (Default _) = empty_fun_spec
haftmann@35226
  1146
          | del_eqn' (Eqns eqns) =
haftmann@35226
  1147
              Eqns (filter_out (fn (thm', _) => Thm.eq_thm_prop (thm, thm')) eqns)
haftmann@35226
  1148
          | del_eqn' spec = spec
haftmann@35226
  1149
      in change_fun_spec true (const_eqn thy thm) del_eqn' thy end
haftmann@31962
  1150
  | NONE => thy;
haftmann@31962
  1151
haftmann@35226
  1152
fun del_eqns c = change_fun_spec true c (K empty_fun_spec);
haftmann@34244
  1153
haftmann@34244
  1154
haftmann@34244
  1155
(* cases *)
haftmann@34244
  1156
haftmann@40758
  1157
fun case_cong thy case_const (num_args, (pos, _)) =
haftmann@37438
  1158
  let
wenzelm@43326
  1159
    val ([x, y], ctxt) = fold_map Name.variant ["A", "A'"] Name.context;
wenzelm@43326
  1160
    val (zs, _) = fold_map Name.variant (replicate (num_args - 1) "") ctxt;
haftmann@37438
  1161
    val (ws, vs) = chop pos zs;
haftmann@37448
  1162
    val T = Logic.unvarifyT_global (Sign.the_const_type thy case_const);
wenzelm@40844
  1163
    val Ts = binder_types T;
haftmann@37438
  1164
    val T_cong = nth Ts pos;
haftmann@37438
  1165
    fun mk_prem z = Free (z, T_cong);
haftmann@37438
  1166
    fun mk_concl z = list_comb (Const (case_const, T), map2 (curry Free) (ws @ z :: vs) Ts);
haftmann@37438
  1167
    val (prem, concl) = pairself Logic.mk_equals (pairself mk_prem (x, y), pairself mk_concl (x, y));
haftmann@37521
  1168
    fun tac { context, prems } = Simplifier.rewrite_goals_tac prems
wenzelm@42360
  1169
      THEN ALLGOALS (Proof_Context.fact_tac [Drule.reflexive_thm]);
haftmann@37438
  1170
  in Skip_Proof.prove_global thy (x :: y :: zs) [prem] concl tac end;
haftmann@37438
  1171
haftmann@34244
  1172
fun add_case thm thy =
haftmann@34244
  1173
  let
haftmann@43634
  1174
    val (case_const, (k, cos)) = case_cert thm;
haftmann@43634
  1175
    val _ = case filter_out (is_constr thy) cos
haftmann@34244
  1176
     of [] => ()
wenzelm@45430
  1177
      | cs => error ("Non-constructor(s) in case certificate: " ^ commas_quote cs);
haftmann@43634
  1178
    val entry = (1 + Int.max (1, length cos), (k, cos));
haftmann@43634
  1179
    fun register_case cong = (map_cases o apfst)
haftmann@43634
  1180
      (Symtab.update (case_const, (entry, cong)));
haftmann@43634
  1181
    fun register_for_constructors (Constructors (cos', cases)) =
haftmann@43634
  1182
         Constructors (cos',
haftmann@43634
  1183
           if exists (fn (co, _) => member (op =) cos co) cos'
haftmann@43634
  1184
           then insert (op =) case_const cases
haftmann@43634
  1185
           else cases)
haftmann@43634
  1186
      | register_for_constructors (x as Abstractor _) = x;
haftmann@43634
  1187
    val register_type = (map_typs o Symtab.map)
haftmann@43634
  1188
      (K ((map o apsnd o apsnd) register_for_constructors));
haftmann@37438
  1189
  in
haftmann@37438
  1190
    thy
haftmann@37438
  1191
    |> Theory.checkpoint
haftmann@37438
  1192
    |> `(fn thy => case_cong thy case_const entry)
haftmann@43634
  1193
    |-> (fn cong => map_exec_purge (register_case cong #> register_type))
haftmann@37438
  1194
  end;
haftmann@34244
  1195
haftmann@34244
  1196
fun add_undefined c thy =
haftmann@34244
  1197
  (map_exec_purge o map_cases o apsnd) (Symtab.update (c, ())) thy;
haftmann@34244
  1198
haftmann@34244
  1199
haftmann@35299
  1200
(* types *)
haftmann@34244
  1201
haftmann@35299
  1202
fun register_type (tyco, vs_spec) thy =
haftmann@34244
  1203
  let
haftmann@35226
  1204
    val (old_constrs, some_old_proj) =
haftmann@35299
  1205
      case these (Symtab.lookup ((the_types o the_exec) thy) tyco)
haftmann@43634
  1206
       of (_, (_, Constructors (cos, _))) :: _ => (map fst cos, NONE)
haftmann@36209
  1207
        | (_, (_, Abstractor ((co, _), (proj, _)))) :: _ => ([co], SOME proj)
haftmann@43636
  1208
        | [] => ([], NONE);
haftmann@43636
  1209
    val outdated_funs1 = (map fst o fst o constructors_of o snd) vs_spec;
haftmann@43636
  1210
    val outdated_funs2 = case some_old_proj
haftmann@43636
  1211
     of NONE => []
haftmann@35226
  1212
      | SOME old_proj => Symtab.fold
haftmann@36209
  1213
          (fn (c, ((_, spec), _)) =>
haftmann@36209
  1214
            if member (op =) (the_list (associated_abstype spec)) tyco
haftmann@35226
  1215
            then insert (op =) c else I)
haftmann@43637
  1216
            ((the_functions o the_exec) thy) [old_proj];
haftmann@34244
  1217
    fun drop_outdated_cases cases = fold Symtab.delete_safe
haftmann@37438
  1218
      (Symtab.fold (fn (c, ((_, (_, cos)), _)) =>
haftmann@35226
  1219
        if exists (member (op =) old_constrs) cos
haftmann@34244
  1220
          then insert (op =) c else I) cases []) cases;
haftmann@34244
  1221
  in
haftmann@34244
  1222
    thy
haftmann@43636
  1223
    |> fold del_eqns (outdated_funs1 @ outdated_funs2)
haftmann@34244
  1224
    |> map_exec_purge
haftmann@35226
  1225
        ((map_typs o Symtab.map_default (tyco, [])) (cons (serial (), vs_spec))
haftmann@34244
  1226
        #> (map_cases o apfst) drop_outdated_cases)
haftmann@34244
  1227
  end;
haftmann@34244
  1228
haftmann@35299
  1229
fun unoverload_const_typ thy (c, ty) = (AxClass.unoverload_const thy (c, ty), ty);
haftmann@34244
  1230
haftmann@35299
  1231
structure Datatype_Interpretation =
haftmann@35299
  1232
  Interpretation(type T = string * serial val eq = eq_snd (op =) : T * T -> bool);
haftmann@35299
  1233
haftmann@35299
  1234
fun datatype_interpretation f = Datatype_Interpretation.interpretation
haftmann@40726
  1235
  (fn (tyco, _) => fn thy => f (tyco, fst (get_type thy tyco)) thy);
haftmann@35226
  1236
haftmann@35226
  1237
fun add_datatype proto_constrs thy =
haftmann@35226
  1238
  let
haftmann@35226
  1239
    val constrs = map (unoverload_const_typ thy) proto_constrs;
haftmann@35226
  1240
    val (tyco, (vs, cos)) = constrset_of_consts thy constrs;
haftmann@35226
  1241
  in
haftmann@35226
  1242
    thy
haftmann@43634
  1243
    |> register_type (tyco, (vs, Constructors (cos, [])))
haftmann@35299
  1244
    |> Datatype_Interpretation.data (tyco, serial ())
haftmann@35226
  1245
  end;
haftmann@35226
  1246
haftmann@35226
  1247
fun add_datatype_cmd raw_constrs thy =
haftmann@35226
  1248
  add_datatype (map (read_bare_const thy) raw_constrs) thy;
haftmann@35226
  1249
haftmann@35299
  1250
structure Abstype_Interpretation =
haftmann@35299
  1251
  Interpretation(type T = string * serial val eq = eq_snd (op =) : T * T -> bool);
haftmann@35299
  1252
haftmann@35299
  1253
fun abstype_interpretation f = Abstype_Interpretation.interpretation
haftmann@35299
  1254
  (fn (tyco, _) => fn thy => f (tyco, get_abstype_spec thy tyco) thy);
haftmann@35299
  1255
haftmann@36112
  1256
fun add_abstype proto_thm thy =
haftmann@34244
  1257
  let
haftmann@40726
  1258
    val (tyco, (vs, (abs_ty as (abs, (_, ty)), (rep, cert)))) =
haftmann@36209
  1259
      error_thm (check_abstype_cert thy) proto_thm;
haftmann@35226
  1260
  in
haftmann@35226
  1261
    thy
haftmann@36112
  1262
    |> register_type (tyco, (vs, Abstractor (abs_ty, (rep, cert))))
wenzelm@45344
  1263
    |> change_fun_spec false rep
wenzelm@45344
  1264
      (K (Proj (Logic.varify_types_global (mk_proj tyco vs ty abs rep), tyco)))
haftmann@36112
  1265
    |> Abstype_Interpretation.data (tyco, serial ())
haftmann@35226
  1266
  end;
haftmann@34244
  1267
haftmann@35226
  1268
haftmann@32070
  1269
(* setup *)
haftmann@31998
  1270
haftmann@31962
  1271
val _ = Context.>> (Context.map_theory
haftmann@31962
  1272
  (let
haftmann@31962
  1273
    fun mk_attribute f = Thm.declaration_attribute (fn thm => Context.mapping (f thm) I);
haftmann@31998
  1274
    val code_attribute_parser =
haftmann@31998
  1275
      Args.del |-- Scan.succeed (mk_attribute del_eqn)
haftmann@31998
  1276
      || Args.$$$ "nbe" |-- Scan.succeed (mk_attribute add_nbe_eqn)
haftmann@36112
  1277
      || Args.$$$ "abstype" |-- Scan.succeed (mk_attribute add_abstype)
haftmann@35226
  1278
      || Args.$$$ "abstract" |-- Scan.succeed (mk_attribute add_abs_eqn)
haftmann@31998
  1279
      || Scan.succeed (mk_attribute add_warning_eqn);
haftmann@31962
  1280
  in
haftmann@35299
  1281
    Datatype_Interpretation.init
haftmann@31998
  1282
    #> Attrib.setup (Binding.name "code") (Scan.lift code_attribute_parser)
haftmann@31998
  1283
        "declare theorems for code generation"
haftmann@31962
  1284
  end));
haftmann@31962
  1285
haftmann@24219
  1286
end; (*struct*)
haftmann@24219
  1287
haftmann@24219
  1288
haftmann@35226
  1289
(* type-safe interfaces for data dependent on executable code *)
haftmann@24219
  1290
haftmann@34173
  1291
functor Code_Data(Data: CODE_DATA_ARGS): CODE_DATA =
haftmann@24219
  1292
struct
haftmann@24219
  1293
haftmann@24219
  1294
type T = Data.T;
haftmann@24219
  1295
exception Data of T;
haftmann@24219
  1296
fun dest (Data x) = x
haftmann@24219
  1297
haftmann@34173
  1298
val kind = Code.declare_data (Data Data.empty);
haftmann@24219
  1299
haftmann@24219
  1300
val data_op = (kind, Data, dest);
haftmann@24219
  1301
haftmann@39397
  1302
fun change_yield (SOME thy) f = Code.change_yield_data data_op thy f
haftmann@39397
  1303
  | change_yield NONE f = f Data.empty
haftmann@39397
  1304
haftmann@39397
  1305
fun change some_thy f = snd (change_yield some_thy (pair () o f));
haftmann@24219
  1306
haftmann@24219
  1307
end;
haftmann@24219
  1308
haftmann@28143
  1309
structure Code : CODE = struct open Code; end;