src/Pure/Isar/code.ML
author haftmann
Sat Jul 02 10:37:35 2011 +0200 (2011-07-02 ago)
changeset 43639 9cba66fb109a
parent 43638 b2ccc49429b7
child 43684 85388f5570c4
permissions -rw-r--r--
correction: do not assume that case const index covered all cases
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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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  (*infrastructure*)
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  val set_code_target_attr: (string -> thm -> theory -> theory) -> theory -> theory
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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 if Sign.typ_equiv thy
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      (Type.strip_sorts ty_decl, Type.strip_sorts (Logic.varifyT_global ty)) then c'
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    else 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 = Unsynchronized.ref (Datatab.empty: kind Datatab.table);
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fun invoke f k = case Datatab.lookup (! kinds) k
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 of 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 _ = CRITICAL (fn () => Unsynchronized.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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   327
    val (datatab, thy_ref) = case Synchronized.value dataref
haftmann@34251
   328
     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@35845
   408
    val ty_decl = (Logic.unvarifyT_global o 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 ();
haftmann@33531
   415
        val _ = if has_duplicates (eq_fst (op =)) vs
haftmann@35226
   416
          then no_constr thy "duplicate type variables in datatype" c_ty else ();
haftmann@33531
   417
        val _ = if length tfrees <> length vs
haftmann@35226
   418
          then no_constr thy "type variables missing in datatype" c_ty else ();
haftmann@31156
   419
      in (tyco, vs) end;
haftmann@35226
   420
    val (tyco, _) = last_typ (c, ty) ty_decl;
haftmann@35226
   421
    val (_, vs) = last_typ (c, ty) ty;
haftmann@35226
   422
  in ((tyco, map snd vs), (c, (map fst vs, ty))) end;
haftmann@35226
   423
haftmann@35226
   424
fun constrset_of_consts thy cs =
haftmann@35226
   425
  let
haftmann@35226
   426
    val _ = map (fn (c, _) => if (is_some o AxClass.class_of_param thy) c
haftmann@35226
   427
      then error ("Is a class parameter: " ^ string_of_const thy c) else ()) cs;
haftmann@31156
   428
    fun add ((tyco', sorts'), c) ((tyco, sorts), cs) =
haftmann@31156
   429
      let
haftmann@31998
   430
        val _ = if (tyco' : string) <> tyco
haftmann@31156
   431
          then error "Different type constructors in constructor set"
haftmann@31156
   432
          else ();
haftmann@40758
   433
        val sorts'' =
haftmann@40758
   434
          map2 (curry (Sorts.inter_sort (Sign.classes_of thy))) sorts' sorts
haftmann@40758
   435
      in ((tyco, sorts''), c :: cs) end;
haftmann@31156
   436
    fun inst vs' (c, (vs, ty)) =
haftmann@31156
   437
      let
haftmann@31156
   438
        val the_v = the o AList.lookup (op =) (vs ~~ vs');
haftmann@40803
   439
        val ty' = map_type_tfree (fn (v, _) => TFree (the_v v)) ty;
haftmann@40764
   440
        val (vs'', _) = logical_typscheme thy (c, ty');
wenzelm@40844
   441
      in (c, (vs'', binder_types ty')) end;
haftmann@40803
   442
    val c' :: cs' = map (analyze_constructor thy) cs;
haftmann@31156
   443
    val ((tyco, sorts), cs'') = fold add cs' (apsnd single c');
wenzelm@43329
   444
    val vs = Name.invent_names Name.context Name.aT sorts;
haftmann@31156
   445
    val cs''' = map (inst vs) cs'';
haftmann@31156
   446
  in (tyco, (vs, rev cs''')) end;
haftmann@31156
   447
haftmann@35299
   448
fun get_type_entry thy tyco = case these (Symtab.lookup ((the_types o the_exec) thy) tyco)
haftmann@35226
   449
 of (_, entry) :: _ => SOME entry
haftmann@35226
   450
  | _ => NONE;
haftmann@31962
   451
haftmann@40726
   452
fun get_type thy tyco = case get_type_entry thy tyco
haftmann@35226
   453
 of SOME (vs, spec) => apfst (pair vs) (constructors_of spec)
haftmann@35226
   454
  | NONE => arity_number thy tyco
wenzelm@43329
   455
      |> Name.invent Name.context Name.aT
haftmann@35226
   456
      |> map (rpair [])
haftmann@35226
   457
      |> rpair []
haftmann@35226
   458
      |> rpair false;
haftmann@35226
   459
haftmann@35299
   460
fun get_abstype_spec thy tyco = case get_type_entry thy tyco
haftmann@35226
   461
 of SOME (vs, Abstractor spec) => (vs, spec)
haftmann@36122
   462
  | _ => error ("Not an abstract type: " ^ tyco);
haftmann@35226
   463
 
haftmann@35299
   464
fun get_type_of_constr_or_abstr thy c =
wenzelm@40844
   465
  case (body_type o const_typ thy) c
haftmann@40758
   466
   of Type (tyco, _) => let val ((_, cos), abstract) = get_type thy tyco
haftmann@35226
   467
        in if member (op =) (map fst cos) c then SOME (tyco, abstract) else NONE end
haftmann@31962
   468
    | _ => NONE;
haftmann@31962
   469
haftmann@35299
   470
fun is_constr thy c = case get_type_of_constr_or_abstr thy c
haftmann@35226
   471
 of SOME (_, false) => true
haftmann@35226
   472
   | _ => false;
haftmann@35226
   473
haftmann@35299
   474
fun is_abstr thy c = case get_type_of_constr_or_abstr thy c
haftmann@35226
   475
 of SOME (_, true) => true
haftmann@35226
   476
   | _ => false;
haftmann@31962
   477
haftmann@31156
   478
haftmann@34874
   479
(* bare code equations *)
haftmann@31156
   480
haftmann@35226
   481
(* convention for variables:
haftmann@35226
   482
    ?x ?'a   for free-floating theorems (e.g. in the data store)
haftmann@35226
   483
    ?x  'a   for certificates
haftmann@35226
   484
     x  'a   for final representation of equations
haftmann@35226
   485
*)
haftmann@35226
   486
haftmann@31156
   487
exception BAD_THM of string;
haftmann@31156
   488
fun bad_thm msg = raise BAD_THM msg;
haftmann@31156
   489
fun error_thm f thm = f thm handle BAD_THM msg => error msg;
haftmann@31642
   490
fun warning_thm f thm = SOME (f thm) handle BAD_THM msg => (warning msg; NONE)
haftmann@31156
   491
fun try_thm f thm = SOME (f thm) handle BAD_THM _ => NONE;
haftmann@31156
   492
haftmann@31156
   493
fun is_linear thm =
haftmann@31156
   494
  let val (_, args) = (strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of) thm
haftmann@31156
   495
  in not (has_duplicates (op =) ((fold o fold_aterms)
haftmann@31156
   496
    (fn Var (v, _) => cons v | _ => I) args [])) end;
haftmann@31156
   497
haftmann@36209
   498
fun check_decl_ty thy (c, ty) =
haftmann@36209
   499
  let
haftmann@36209
   500
    val ty_decl = Sign.the_const_type thy c;
haftmann@36209
   501
  in if Sign.typ_equiv thy (Type.strip_sorts ty_decl, Type.strip_sorts ty) then ()
haftmann@36209
   502
    else bad_thm ("Type\n" ^ string_of_typ thy ty
haftmann@36209
   503
      ^ "\nof constant " ^ quote c
haftmann@40362
   504
      ^ "\nis too specific compared to declared type\n"
haftmann@36209
   505
      ^ string_of_typ thy ty_decl)
haftmann@36209
   506
  end; 
haftmann@36209
   507
haftmann@35226
   508
fun check_eqn thy { allow_nonlinear, allow_consts, allow_pats } thm (lhs, rhs) =
haftmann@31156
   509
  let
haftmann@34894
   510
    fun bad s = bad_thm (s ^ ":\n" ^ Display.string_of_thm_global thy thm);
haftmann@31156
   511
    fun vars_of t = fold_aterms (fn Var (v, _) => insert (op =) v
haftmann@34894
   512
      | Free _ => bad "Illegal free variable in equation"
haftmann@31156
   513
      | _ => I) t [];
haftmann@31156
   514
    fun tvars_of t = fold_term_types (fn _ =>
haftmann@31156
   515
      fold_atyps (fn TVar (v, _) => insert (op =) v
haftmann@34894
   516
        | TFree _ => bad "Illegal free type variable in equation")) t [];
haftmann@31156
   517
    val lhs_vs = vars_of lhs;
haftmann@31156
   518
    val rhs_vs = vars_of rhs;
haftmann@31156
   519
    val lhs_tvs = tvars_of lhs;
haftmann@31156
   520
    val rhs_tvs = tvars_of rhs;
haftmann@31156
   521
    val _ = if null (subtract (op =) lhs_vs rhs_vs)
haftmann@31156
   522
      then ()
haftmann@34894
   523
      else bad "Free variables on right hand side of equation";
haftmann@31156
   524
    val _ = if null (subtract (op =) lhs_tvs rhs_tvs)
haftmann@31156
   525
      then ()
haftmann@34894
   526
      else bad "Free type variables on right hand side of equation";
haftmann@34894
   527
    val (head, args) = strip_comb lhs;
haftmann@31156
   528
    val (c, ty) = case head
haftmann@31156
   529
     of Const (c_ty as (_, ty)) => (AxClass.unoverload_const thy c_ty, ty)
haftmann@34894
   530
      | _ => bad "Equation not headed by constant";
haftmann@34894
   531
    fun check _ (Abs _) = bad "Abstraction on left hand side of equation"
haftmann@31156
   532
      | check 0 (Var _) = ()
haftmann@34894
   533
      | check _ (Var _) = bad "Variable with application on left hand side of equation"
haftmann@31156
   534
      | check n (t1 $ t2) = (check (n+1) t1; check 0 t2)
haftmann@34894
   535
      | check n (Const (c_ty as (c, ty))) =
haftmann@35226
   536
          if allow_pats then let
haftmann@33940
   537
            val c' = AxClass.unoverload_const thy c_ty
wenzelm@40844
   538
          in if n = (length o binder_types o subst_signature thy c') ty
haftmann@35226
   539
            then if allow_consts orelse is_constr thy c'
haftmann@33940
   540
              then ()
haftmann@34894
   541
              else bad (quote c ^ " is not a constructor, on left hand side of equation")
haftmann@34894
   542
            else bad ("Partially applied constant " ^ quote c ^ " on left hand side of equation")
haftmann@36209
   543
          end else bad ("Pattern not allowed here, but constant " ^ quote c ^ " encountered on left hand side")
haftmann@31156
   544
    val _ = map (check 0) args;
haftmann@35226
   545
    val _ = if allow_nonlinear orelse is_linear thm then ()
haftmann@34894
   546
      else bad "Duplicate variables on left hand side of equation";
haftmann@34894
   547
    val _ = if (is_none o AxClass.class_of_param thy) c then ()
haftmann@34894
   548
      else bad "Overloaded constant as head in equation";
haftmann@34894
   549
    val _ = if not (is_constr thy c) then ()
haftmann@34894
   550
      else bad "Constructor as head in equation";
haftmann@35226
   551
    val _ = if not (is_abstr thy c) then ()
haftmann@35226
   552
      else bad "Abstractor as head in equation";
haftmann@36209
   553
    val _ = check_decl_ty thy (c, ty);
haftmann@35226
   554
  in () end;
haftmann@35226
   555
haftmann@35226
   556
fun gen_assert_eqn thy check_patterns (thm, proper) =
haftmann@35226
   557
  let
haftmann@35226
   558
    fun bad s = bad_thm (s ^ ":\n" ^ Display.string_of_thm_global thy thm);
haftmann@35226
   559
    val (lhs, rhs) = (Logic.dest_equals o Thm.plain_prop_of) thm
haftmann@35226
   560
      handle TERM _ => bad "Not an equation"
haftmann@35226
   561
           | THM _ => bad "Not a proper equation";
haftmann@35226
   562
    val _ = check_eqn thy { allow_nonlinear = not proper,
haftmann@35226
   563
      allow_consts = not (proper andalso check_patterns), allow_pats = true } thm (lhs, rhs);
haftmann@31156
   564
  in (thm, proper) end;
haftmann@31156
   565
haftmann@35226
   566
fun assert_abs_eqn thy some_tyco thm =
haftmann@35226
   567
  let
haftmann@35226
   568
    fun bad s = bad_thm (s ^ ":\n" ^ Display.string_of_thm_global thy thm);
haftmann@35226
   569
    val (full_lhs, rhs) = (Logic.dest_equals o Thm.plain_prop_of) thm
haftmann@35226
   570
      handle TERM _ => bad "Not an equation"
haftmann@35226
   571
           | THM _ => bad "Not a proper equation";
haftmann@35226
   572
    val (rep, lhs) = dest_comb full_lhs
haftmann@35226
   573
      handle TERM _ => bad "Not an abstract equation";
haftmann@36202
   574
    val (rep_const, ty) = dest_Const rep;
haftmann@40187
   575
    val (tyco, Ts) = (dest_Type o domain_type) ty
haftmann@39552
   576
      handle TERM _ => bad "Not an abstract equation"
haftmann@39552
   577
           | TYPE _ => bad "Not an abstract equation";
haftmann@35226
   578
    val _ = case some_tyco of SOME tyco' => if tyco = tyco' then ()
haftmann@35226
   579
          else bad ("Abstract type mismatch:" ^ quote tyco ^ " vs. " ^ quote tyco')
haftmann@35226
   580
      | NONE => ();
haftmann@36202
   581
    val (vs', (_, (rep', _))) = get_abstype_spec thy tyco;
haftmann@35226
   582
    val _ = if rep_const = rep' then ()
haftmann@35226
   583
      else bad ("Projection mismatch: " ^ quote rep_const ^ " vs. " ^ quote rep');
haftmann@35226
   584
    val _ = check_eqn thy { allow_nonlinear = false,
haftmann@35226
   585
      allow_consts = false, allow_pats = false } thm (lhs, rhs);
haftmann@40564
   586
    val _ = if forall2 (fn T => fn (_, sort) => Sign.of_sort thy (T, sort)) Ts vs' then ()
haftmann@40187
   587
      else error ("Type arguments do not satisfy sort constraints of abstype certificate.");
haftmann@35226
   588
  in (thm, tyco) end;
haftmann@35226
   589
haftmann@34894
   590
fun assert_eqn thy = error_thm (gen_assert_eqn thy true);
haftmann@31962
   591
wenzelm@42360
   592
fun meta_rewrite thy = Local_Defs.meta_rewrite_rule (Proof_Context.init_global thy);
haftmann@31156
   593
haftmann@34894
   594
fun mk_eqn thy = error_thm (gen_assert_eqn thy false) o
haftmann@31962
   595
  apfst (meta_rewrite thy);
haftmann@31962
   596
haftmann@31962
   597
fun mk_eqn_warning thy = Option.map (fn (thm, _) => (thm, is_linear thm))
haftmann@34894
   598
  o warning_thm (gen_assert_eqn thy false) o rpair false o meta_rewrite thy;
haftmann@31962
   599
haftmann@31962
   600
fun mk_eqn_liberal thy = Option.map (fn (thm, _) => (thm, is_linear thm))
haftmann@34894
   601
  o try_thm (gen_assert_eqn thy false) o rpair false o meta_rewrite thy;
haftmann@31156
   602
haftmann@35226
   603
fun mk_abs_eqn thy = error_thm (assert_abs_eqn thy NONE) o meta_rewrite thy;
haftmann@35226
   604
haftmann@33940
   605
val head_eqn = dest_Const o fst o strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of;
haftmann@31156
   606
haftmann@31957
   607
fun const_typ_eqn thy thm =
haftmann@31156
   608
  let
haftmann@32640
   609
    val (c, ty) = head_eqn thm;
haftmann@31156
   610
    val c' = AxClass.unoverload_const thy (c, ty);
haftmann@33940
   611
      (*permissive wrt. to overloaded constants!*)
haftmann@31156
   612
  in (c', ty) end;
haftmann@33940
   613
haftmann@31957
   614
fun const_eqn thy = fst o const_typ_eqn thy;
haftmann@31156
   615
haftmann@35226
   616
fun const_abs_eqn thy = AxClass.unoverload_const thy o dest_Const o fst o strip_comb o snd
haftmann@35226
   617
  o dest_comb o fst o Logic.dest_equals o Thm.plain_prop_of;
haftmann@35226
   618
haftmann@35226
   619
fun mk_proj tyco vs ty abs rep =
haftmann@35226
   620
  let
haftmann@35226
   621
    val ty_abs = Type (tyco, map TFree vs);
haftmann@35226
   622
    val xarg = Var (("x", 0), ty);
haftmann@35226
   623
  in Logic.mk_equals (Const (rep, ty_abs --> ty) $ (Const (abs, ty --> ty_abs) $ xarg), xarg) end;
haftmann@35226
   624
haftmann@34895
   625
haftmann@34895
   626
(* technical transformations of code equations *)
haftmann@34895
   627
haftmann@34895
   628
fun expand_eta thy k thm =
haftmann@34895
   629
  let
haftmann@34895
   630
    val (lhs, rhs) = (Logic.dest_equals o Thm.plain_prop_of) thm;
haftmann@34895
   631
    val (_, args) = strip_comb lhs;
haftmann@34895
   632
    val l = if k = ~1
haftmann@34895
   633
      then (length o fst o strip_abs) rhs
haftmann@34895
   634
      else Int.max (0, k - length args);
haftmann@34895
   635
    val (raw_vars, _) = Term.strip_abs_eta l rhs;
haftmann@34895
   636
    val vars = burrow_fst (Name.variant_list (map (fst o fst) (Term.add_vars lhs [])))
haftmann@34895
   637
      raw_vars;
haftmann@34895
   638
    fun expand (v, ty) thm = Drule.fun_cong_rule thm
haftmann@34895
   639
      (Thm.cterm_of thy (Var ((v, 0), ty)));
haftmann@34895
   640
  in
haftmann@34895
   641
    thm
haftmann@34895
   642
    |> fold expand vars
haftmann@34895
   643
    |> Conv.fconv_rule Drule.beta_eta_conversion
haftmann@34895
   644
  end;
haftmann@34895
   645
haftmann@34895
   646
fun same_arity thy thms =
haftmann@31962
   647
  let
haftmann@34895
   648
    val num_args_of = length o snd o strip_comb o fst o Logic.dest_equals;
haftmann@34895
   649
    val k = fold (Integer.max o num_args_of o Thm.prop_of) thms 0;
haftmann@34895
   650
  in map (expand_eta thy k) thms end;
haftmann@34895
   651
haftmann@34895
   652
fun mk_desymbolization pre post mk vs =
haftmann@34895
   653
  let
haftmann@34895
   654
    val names = map (pre o fst o fst) vs
haftmann@34895
   655
      |> map (Name.desymbolize false)
haftmann@34895
   656
      |> Name.variant_list []
haftmann@34895
   657
      |> map post;
haftmann@34895
   658
  in map_filter (fn (((v, i), x), v') =>
haftmann@34895
   659
    if v = v' andalso i = 0 then NONE
haftmann@34895
   660
    else SOME (((v, i), x), mk ((v', 0), x))) (vs ~~ names)
haftmann@34895
   661
  end;
haftmann@34895
   662
haftmann@40758
   663
fun desymbolize_tvars thms =
haftmann@34895
   664
  let
haftmann@34895
   665
    val tvs = fold (Term.add_tvars o Thm.prop_of) thms [];
haftmann@34895
   666
    val tvar_subst = mk_desymbolization (unprefix "'") (prefix "'") TVar tvs;
haftmann@34895
   667
  in map (Thm.certify_instantiate (tvar_subst, [])) thms end;
haftmann@34895
   668
haftmann@40758
   669
fun desymbolize_vars thm =
haftmann@34895
   670
  let
haftmann@34895
   671
    val vs = Term.add_vars (Thm.prop_of thm) [];
haftmann@34895
   672
    val var_subst = mk_desymbolization I I Var vs;
haftmann@34895
   673
  in Thm.certify_instantiate ([], var_subst) thm end;
haftmann@34895
   674
haftmann@40758
   675
fun canonize_thms thy = desymbolize_tvars #> same_arity thy #> map desymbolize_vars;
haftmann@31156
   676
haftmann@34874
   677
haftmann@36112
   678
(* abstype certificates *)
haftmann@36112
   679
haftmann@36112
   680
fun check_abstype_cert thy proto_thm =
haftmann@36112
   681
  let
haftmann@36209
   682
    val thm = (AxClass.unoverload thy o meta_rewrite thy) proto_thm;
haftmann@36112
   683
    fun bad s = bad_thm (s ^ ":\n" ^ Display.string_of_thm_global thy thm);
haftmann@36112
   684
    val (lhs, rhs) = Logic.dest_equals (Thm.plain_prop_of thm)
haftmann@36112
   685
      handle TERM _ => bad "Not an equation"
haftmann@36112
   686
           | THM _ => bad "Not a proper equation";
haftmann@36209
   687
    val ((abs, raw_ty), ((rep, rep_ty), param)) = (apsnd (apfst dest_Const o dest_comb)
haftmann@36112
   688
        o apfst dest_Const o dest_comb) lhs
haftmann@36112
   689
      handle TERM _ => bad "Not an abstype certificate";
haftmann@36209
   690
    val _ = pairself (fn c => if (is_some o AxClass.class_of_param thy) c
haftmann@36209
   691
      then error ("Is a class parameter: " ^ string_of_const thy c) else ()) (abs, rep);
haftmann@36209
   692
    val _ = check_decl_ty thy (abs, raw_ty);
haftmann@36209
   693
    val _ = check_decl_ty thy (rep, rep_ty);
haftmann@40758
   694
    val _ = (fst o dest_Var) param
haftmann@36112
   695
      handle TERM _ => bad "Not an abstype certificate";
haftmann@36112
   696
    val _ = if param = rhs then () else bad "Not an abstype certificate";
haftmann@40803
   697
    val ((tyco, sorts), (abs, (vs, ty'))) = analyze_constructor thy (abs, Logic.unvarifyT_global raw_ty);
haftmann@36112
   698
    val ty = domain_type ty';
haftmann@40764
   699
    val (vs', _) = logical_typscheme thy (abs, ty');
haftmann@40726
   700
  in (tyco, (vs ~~ sorts, ((abs, (vs', ty)), (rep, thm)))) end;
haftmann@36112
   701
haftmann@36112
   702
haftmann@34874
   703
(* code equation certificates *)
haftmann@34874
   704
haftmann@34895
   705
fun build_head thy (c, ty) =
haftmann@34895
   706
  Thm.cterm_of thy (Logic.mk_equals (Free ("HEAD", ty), Const (c, ty)));
haftmann@34874
   707
haftmann@34895
   708
fun get_head thy cert_thm =
haftmann@34895
   709
  let
haftmann@34895
   710
    val [head] = (#hyps o Thm.crep_thm) cert_thm;
haftmann@34895
   711
    val (_, Const (c, ty)) = (Logic.dest_equals o Thm.term_of) head;
haftmann@34895
   712
  in (typscheme thy (c, ty), head) end;
haftmann@34895
   713
haftmann@35226
   714
fun typscheme_projection thy =
haftmann@35226
   715
  typscheme thy o dest_Const o fst o dest_comb o fst o Logic.dest_equals;
haftmann@35226
   716
haftmann@35226
   717
fun typscheme_abs thy =
haftmann@35226
   718
  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
   719
haftmann@35226
   720
fun constrain_thm thy vs sorts thm =
haftmann@35226
   721
  let
haftmann@35226
   722
    val mapping = map2 (fn (v, sort) => fn sort' =>
haftmann@35226
   723
      (v, Sorts.inter_sort (Sign.classes_of thy) (sort, sort'))) vs sorts;
haftmann@35226
   724
    val inst = map2 (fn (v, sort) => fn (_, sort') =>
haftmann@35226
   725
      (((v, 0), sort), TFree (v, sort'))) vs mapping;
haftmann@40803
   726
    val subst = (map_types o map_type_tfree)
haftmann@40803
   727
      (fn (v, _) => TFree (v, the (AList.lookup (op =) mapping v)));
haftmann@35226
   728
  in
haftmann@35226
   729
    thm
wenzelm@35845
   730
    |> Thm.varifyT_global
haftmann@35226
   731
    |> Thm.certify_instantiate (inst, [])
haftmann@35226
   732
    |> pair subst
haftmann@35226
   733
  end;
haftmann@35226
   734
haftmann@35226
   735
fun concretify_abs thy tyco abs_thm =
haftmann@35226
   736
  let
haftmann@40758
   737
    val (_, ((c, _), (_, cert))) = get_abstype_spec thy tyco;
haftmann@35226
   738
    val lhs = (fst o Logic.dest_equals o Thm.prop_of) abs_thm
haftmann@35226
   739
    val ty = fastype_of lhs;
haftmann@35226
   740
    val ty_abs = (fastype_of o snd o dest_comb) lhs;
haftmann@35226
   741
    val abs = Thm.cterm_of thy (Const (c, ty --> ty_abs));
haftmann@35226
   742
    val raw_concrete_thm = Drule.transitive_thm OF [Thm.symmetric cert, Thm.combination (Thm.reflexive abs) abs_thm];
wenzelm@35845
   743
  in (c, (Thm.varifyT_global o zero_var_indexes) raw_concrete_thm) end;
haftmann@35226
   744
haftmann@35226
   745
fun add_rhss_of_eqn thy t =
haftmann@35226
   746
  let
haftmann@35226
   747
    val (args, rhs) = (apfst (snd o strip_comb) o Logic.dest_equals o subst_signatures thy) t;
haftmann@35226
   748
    fun add_const (Const (c, ty)) = insert (op =) (c, Sign.const_typargs thy (c, ty))
haftmann@35226
   749
      | add_const _ = I
haftmann@39568
   750
    val add_consts = fold_aterms add_const
haftmann@39568
   751
  in add_consts rhs o fold add_consts args end;
haftmann@35226
   752
wenzelm@35845
   753
fun dest_eqn thy =
wenzelm@35845
   754
  apfst (snd o strip_comb) o Logic.dest_equals o subst_signatures thy o Logic.unvarify_global;
haftmann@35226
   755
haftmann@35226
   756
abstype cert = Equations of thm * bool list
haftmann@35226
   757
  | Projection of term * string
haftmann@35226
   758
  | Abstract of thm * string
haftmann@35226
   759
with
haftmann@34891
   760
haftmann@34891
   761
fun empty_cert thy c = 
haftmann@34891
   762
  let
haftmann@40761
   763
    val raw_ty = Logic.unvarifyT_global (const_typ thy c);
haftmann@40764
   764
    val (vs, _) = logical_typscheme thy (c, raw_ty);
haftmann@40761
   765
    val sortargs = case AxClass.class_of_param thy c
haftmann@40761
   766
     of SOME class => [[class]]
haftmann@40761
   767
      | NONE => (case get_type_of_constr_or_abstr thy c
haftmann@40761
   768
         of SOME (tyco, _) => (map snd o fst o the)
haftmann@40761
   769
              (AList.lookup (op =) ((snd o fst o get_type thy) tyco) c)
haftmann@40761
   770
          | NONE => replicate (length vs) []);
haftmann@40761
   771
    val the_sort = the o AList.lookup (op =) (map fst vs ~~ sortargs);
haftmann@40761
   772
    val ty = map_type_tfree (fn (v, _) => TFree (v, the_sort v)) raw_ty
haftmann@34895
   773
    val chead = build_head thy (c, ty);
haftmann@35226
   774
  in Equations (Thm.weaken chead Drule.dummy_thm, []) end;
haftmann@34891
   775
haftmann@34891
   776
fun cert_of_eqns thy c [] = empty_cert thy c
haftmann@34895
   777
  | cert_of_eqns thy c raw_eqns = 
haftmann@34874
   778
      let
haftmann@34895
   779
        val eqns = burrow_fst (canonize_thms thy) raw_eqns;
haftmann@34895
   780
        val _ = map (assert_eqn thy) eqns;
haftmann@34891
   781
        val (thms, propers) = split_list eqns;
haftmann@34895
   782
        val _ = map (fn thm => if c = const_eqn thy thm then ()
haftmann@34895
   783
          else error ("Wrong head of code equation,\nexpected constant "
haftmann@34895
   784
            ^ string_of_const thy c ^ "\n" ^ Display.string_of_thm_global thy thm)) thms;
haftmann@34891
   785
        fun tvars_of T = rev (Term.add_tvarsT T []);
haftmann@34891
   786
        val vss = map (tvars_of o snd o head_eqn) thms;
haftmann@34891
   787
        fun inter_sorts vs =
haftmann@34891
   788
          fold (curry (Sorts.inter_sort (Sign.classes_of thy)) o snd) vs [];
haftmann@34891
   789
        val sorts = map_transpose inter_sorts vss;
wenzelm@43329
   790
        val vts = Name.invent_names Name.context Name.aT sorts;
haftmann@40758
   791
        val thms' =
haftmann@34891
   792
          map2 (fn vs => Thm.certify_instantiate (vs ~~ map TFree vts, [])) vss thms;
haftmann@40758
   793
        val head_thm = Thm.symmetric (Thm.assume (build_head thy (head_eqn (hd thms'))));
haftmann@34874
   794
        fun head_conv ct = if can Thm.dest_comb ct
haftmann@34874
   795
          then Conv.fun_conv head_conv ct
haftmann@34874
   796
          else Conv.rewr_conv head_thm ct;
haftmann@34874
   797
        val rewrite_head = Conv.fconv_rule (Conv.arg1_conv head_conv);
haftmann@40758
   798
        val cert_thm = Conjunction.intr_balanced (map rewrite_head thms');
haftmann@35226
   799
      in Equations (cert_thm, propers) end;
haftmann@34891
   800
haftmann@35226
   801
fun cert_of_proj thy c tyco =
haftmann@35226
   802
  let
haftmann@40758
   803
    val (vs, ((abs, (_, ty)), (rep, _))) = get_abstype_spec thy tyco;
haftmann@35226
   804
    val _ = if c = rep then () else
haftmann@35226
   805
      error ("Wrong head of projection,\nexpected constant " ^ string_of_const thy rep);
haftmann@35226
   806
  in Projection (mk_proj tyco vs ty abs rep, tyco) end;
haftmann@35226
   807
haftmann@35226
   808
fun cert_of_abs thy tyco c raw_abs_thm =
haftmann@34874
   809
  let
haftmann@35226
   810
    val abs_thm = singleton (canonize_thms thy) raw_abs_thm;
haftmann@35226
   811
    val _ = assert_abs_eqn thy (SOME tyco) abs_thm;
haftmann@35226
   812
    val _ = if c = const_abs_eqn thy abs_thm then ()
haftmann@35226
   813
      else error ("Wrong head of abstract code equation,\nexpected constant "
haftmann@35226
   814
        ^ string_of_const thy c ^ "\n" ^ Display.string_of_thm_global thy abs_thm);
wenzelm@36615
   815
  in Abstract (Thm.legacy_freezeT abs_thm, tyco) end;
haftmann@34874
   816
haftmann@35226
   817
fun constrain_cert thy sorts (Equations (cert_thm, propers)) =
haftmann@35226
   818
      let
haftmann@35226
   819
        val ((vs, _), head) = get_head thy cert_thm;
haftmann@35226
   820
        val (subst, cert_thm') = cert_thm
haftmann@35226
   821
          |> Thm.implies_intr head
haftmann@35226
   822
          |> constrain_thm thy vs sorts;
haftmann@35226
   823
        val head' = Thm.term_of head
haftmann@35226
   824
          |> subst
haftmann@35226
   825
          |> Thm.cterm_of thy;
haftmann@35226
   826
        val cert_thm'' = cert_thm'
haftmann@35226
   827
          |> Thm.elim_implies (Thm.assume head');
haftmann@35226
   828
      in Equations (cert_thm'', propers) end
haftmann@35226
   829
  | constrain_cert thy _ (cert as Projection _) =
haftmann@35226
   830
      cert
haftmann@35226
   831
  | constrain_cert thy sorts (Abstract (abs_thm, tyco)) =
haftmann@35226
   832
      Abstract (snd (constrain_thm thy (fst (typscheme_abs thy abs_thm)) sorts abs_thm), tyco);
haftmann@35226
   833
haftmann@35226
   834
fun typscheme_of_cert thy (Equations (cert_thm, _)) =
haftmann@35226
   835
      fst (get_head thy cert_thm)
haftmann@35226
   836
  | typscheme_of_cert thy (Projection (proj, _)) =
haftmann@35226
   837
      typscheme_projection thy proj
haftmann@35226
   838
  | typscheme_of_cert thy (Abstract (abs_thm, _)) =
haftmann@35226
   839
      typscheme_abs thy abs_thm;
haftmann@34874
   840
haftmann@35226
   841
fun typargs_deps_of_cert thy (Equations (cert_thm, propers)) =
haftmann@35226
   842
      let
haftmann@35226
   843
        val vs = (fst o fst) (get_head thy cert_thm);
haftmann@35226
   844
        val equations = if null propers then [] else
haftmann@35226
   845
          Thm.prop_of cert_thm
haftmann@35226
   846
          |> Logic.dest_conjunction_balanced (length propers);
haftmann@35226
   847
      in (vs, fold (add_rhss_of_eqn thy) equations []) end
haftmann@40758
   848
  | typargs_deps_of_cert thy (Projection (t, _)) =
haftmann@35226
   849
      (fst (typscheme_projection thy t), add_rhss_of_eqn thy t [])
haftmann@35226
   850
  | typargs_deps_of_cert thy (Abstract (abs_thm, tyco)) =
haftmann@35226
   851
      let
haftmann@35226
   852
        val vs = fst (typscheme_abs thy abs_thm);
haftmann@35226
   853
        val (_, concrete_thm) = concretify_abs thy tyco abs_thm;
haftmann@36202
   854
      in (vs, add_rhss_of_eqn thy (map_types Logic.unvarifyT_global (Thm.prop_of concrete_thm)) []) end;
haftmann@34895
   855
haftmann@35226
   856
fun equations_of_cert thy (cert as Equations (cert_thm, propers)) =
haftmann@35226
   857
      let
haftmann@35226
   858
        val tyscm = typscheme_of_cert thy cert;
haftmann@35226
   859
        val thms = if null propers then [] else
haftmann@35226
   860
          cert_thm
wenzelm@35624
   861
          |> Local_Defs.expand [snd (get_head thy cert_thm)]
wenzelm@35845
   862
          |> Thm.varifyT_global
haftmann@35226
   863
          |> Conjunction.elim_balanced (length propers);
haftmann@36209
   864
        fun abstractions (args, rhs) = (map (rpair NONE) args, (rhs, NONE));
haftmann@36209
   865
      in (tyscm, map (abstractions o dest_eqn thy o Thm.prop_of) thms ~~ (map SOME thms ~~ propers)) end
haftmann@35226
   866
  | equations_of_cert thy (Projection (t, tyco)) =
haftmann@35226
   867
      let
haftmann@35226
   868
        val (_, ((abs, _), _)) = get_abstype_spec thy tyco;
haftmann@35226
   869
        val tyscm = typscheme_projection thy t;
wenzelm@35845
   870
        val t' = map_types Logic.varifyT_global t;
haftmann@36209
   871
        fun abstractions (args, rhs) = (map (rpair (SOME abs)) args, (rhs, NONE));
haftmann@36209
   872
      in (tyscm, [((abstractions o dest_eqn thy) t', (NONE, true))]) end
haftmann@35226
   873
  | equations_of_cert thy (Abstract (abs_thm, tyco)) =
haftmann@35226
   874
      let
haftmann@35226
   875
        val tyscm = typscheme_abs thy abs_thm;
haftmann@35226
   876
        val (abs, concrete_thm) = concretify_abs thy tyco abs_thm;
haftmann@36209
   877
        fun abstractions (args, rhs) = (map (rpair NONE) args, (rhs, (SOME abs)));
wenzelm@35845
   878
      in
haftmann@36209
   879
        (tyscm, [((abstractions o dest_eqn thy o Thm.prop_of) concrete_thm,
haftmann@36209
   880
          (SOME (Thm.varifyT_global abs_thm), true))])
wenzelm@35845
   881
      end;
haftmann@34895
   882
haftmann@35226
   883
fun pretty_cert thy (cert as Equations _) =
haftmann@35226
   884
      (map_filter (Option.map (Display.pretty_thm_global thy o AxClass.overload thy) o fst o snd)
haftmann@35226
   885
         o snd o equations_of_cert thy) cert
haftmann@35226
   886
  | pretty_cert thy (Projection (t, _)) =
wenzelm@35845
   887
      [Syntax.pretty_term_global thy (map_types Logic.varifyT_global t)]
haftmann@40758
   888
  | pretty_cert thy (Abstract (abs_thm, _)) =
wenzelm@35845
   889
      [(Display.pretty_thm_global thy o AxClass.overload thy o Thm.varifyT_global) abs_thm];
haftmann@35226
   890
haftmann@35226
   891
fun bare_thms_of_cert thy (cert as Equations _) =
haftmann@35226
   892
      (map_filter (fn (_, (some_thm, proper)) => if proper then some_thm else NONE)
haftmann@35226
   893
        o snd o equations_of_cert thy) cert
haftmann@35376
   894
  | bare_thms_of_cert thy (Projection _) = []
haftmann@35376
   895
  | bare_thms_of_cert thy (Abstract (abs_thm, tyco)) =
wenzelm@35845
   896
      [Thm.varifyT_global (snd (concretify_abs thy tyco abs_thm))];
haftmann@34895
   897
haftmann@34895
   898
end;
haftmann@34891
   899
haftmann@34874
   900
haftmann@35226
   901
(* code certificate access *)
haftmann@35226
   902
haftmann@35226
   903
fun retrieve_raw thy c =
haftmann@35226
   904
  Symtab.lookup ((the_functions o the_exec) thy) c
haftmann@35226
   905
  |> Option.map (snd o fst)
haftmann@37460
   906
  |> the_default empty_fun_spec
haftmann@34874
   907
haftmann@35226
   908
fun get_cert thy f c = case retrieve_raw thy c
haftmann@37460
   909
 of Default (_, eqns_lazy) => Lazy.force eqns_lazy
haftmann@35226
   910
      |> (map o apfst) (Thm.transfer thy)
haftmann@35226
   911
      |> f
haftmann@35226
   912
      |> (map o apfst) (AxClass.unoverload thy)
haftmann@35226
   913
      |> cert_of_eqns thy c
haftmann@35226
   914
  | Eqns eqns => eqns
haftmann@35226
   915
      |> (map o apfst) (Thm.transfer thy)
haftmann@35226
   916
      |> f
haftmann@35226
   917
      |> (map o apfst) (AxClass.unoverload thy)
haftmann@35226
   918
      |> cert_of_eqns thy c
haftmann@35226
   919
  | Proj (_, tyco) =>
haftmann@35226
   920
      cert_of_proj thy c tyco
haftmann@35226
   921
  | Abstr (abs_thm, tyco) => abs_thm
haftmann@35226
   922
      |> Thm.transfer thy
haftmann@35226
   923
      |> AxClass.unoverload thy
haftmann@35226
   924
      |> cert_of_abs thy tyco c;
haftmann@31962
   925
haftmann@31962
   926
haftmann@31962
   927
(* cases *)
haftmann@31156
   928
haftmann@31156
   929
fun case_certificate thm =
haftmann@31156
   930
  let
haftmann@31156
   931
    val ((head, raw_case_expr), cases) = (apfst Logic.dest_equals
haftmann@32640
   932
      o apsnd Logic.dest_conjunctions o Logic.dest_implies o Thm.plain_prop_of) thm;
haftmann@31156
   933
    val _ = case head of Free _ => true
haftmann@31156
   934
      | Var _ => true
haftmann@31156
   935
      | _ => raise TERM ("case_cert", []);
haftmann@31156
   936
    val ([(case_var, _)], case_expr) = Term.strip_abs_eta 1 raw_case_expr;
haftmann@31156
   937
    val (Const (case_const, _), raw_params) = strip_comb case_expr;
haftmann@31156
   938
    val n = find_index (fn Free (v, _) => v = case_var | _ => false) raw_params;
haftmann@31156
   939
    val _ = if n = ~1 then raise TERM ("case_cert", []) else ();
haftmann@31156
   940
    val params = map (fst o dest_Var) (nth_drop n raw_params);
haftmann@31156
   941
    fun dest_case t =
haftmann@31156
   942
      let
haftmann@31156
   943
        val (head' $ t_co, rhs) = Logic.dest_equals t;
haftmann@31156
   944
        val _ = if head' = head then () else raise TERM ("case_cert", []);
haftmann@31156
   945
        val (Const (co, _), args) = strip_comb t_co;
haftmann@31156
   946
        val (Var (param, _), args') = strip_comb rhs;
haftmann@31156
   947
        val _ = if args' = args then () else raise TERM ("case_cert", []);
haftmann@31156
   948
      in (param, co) end;
haftmann@31156
   949
    fun analyze_cases cases =
haftmann@31156
   950
      let
haftmann@31156
   951
        val co_list = fold (AList.update (op =) o dest_case) cases [];
haftmann@31156
   952
      in map (the o AList.lookup (op =) co_list) params end;
haftmann@31156
   953
    fun analyze_let t =
haftmann@31156
   954
      let
haftmann@31156
   955
        val (head' $ arg, Var (param', _) $ arg') = Logic.dest_equals t;
haftmann@31156
   956
        val _ = if head' = head then () else raise TERM ("case_cert", []);
haftmann@31156
   957
        val _ = if arg' = arg then () else raise TERM ("case_cert", []);
haftmann@31156
   958
        val _ = if [param'] = params then () else raise TERM ("case_cert", []);
haftmann@31156
   959
      in [] end;
haftmann@31156
   960
    fun analyze (cases as [let_case]) =
haftmann@31156
   961
          (analyze_cases cases handle Bind => analyze_let let_case)
haftmann@31156
   962
      | analyze cases = analyze_cases cases;
haftmann@31156
   963
  in (case_const, (n, analyze cases)) end;
haftmann@31156
   964
haftmann@31156
   965
fun case_cert thm = case_certificate thm
haftmann@31156
   966
  handle Bind => error "bad case certificate"
haftmann@31156
   967
       | TERM _ => error "bad case certificate";
haftmann@31156
   968
haftmann@37438
   969
fun get_case_scheme thy = Option.map fst o Symtab.lookup ((fst o the_cases o the_exec) thy);
haftmann@37438
   970
fun get_case_cong thy = Option.map snd o Symtab.lookup ((fst o the_cases o the_exec) thy);
haftmann@24219
   971
haftmann@31962
   972
val undefineds = Symtab.keys o snd o the_cases o the_exec;
haftmann@24219
   973
haftmann@24219
   974
haftmann@31962
   975
(* diagnostic *)
haftmann@24219
   976
haftmann@24219
   977
fun print_codesetup thy =
haftmann@24219
   978
  let
wenzelm@42360
   979
    val ctxt = Proof_Context.init_global thy;
haftmann@24844
   980
    val exec = the_exec thy;
haftmann@35226
   981
    fun pretty_equations const thms =
haftmann@24219
   982
      (Pretty.block o Pretty.fbreaks) (
haftmann@35226
   983
        Pretty.str (string_of_const thy const) :: map (Display.pretty_thm ctxt) thms
haftmann@24219
   984
      );
haftmann@37460
   985
    fun pretty_function (const, Default (_, eqns_lazy)) = pretty_equations const (map fst (Lazy.force eqns_lazy))
haftmann@35226
   986
      | pretty_function (const, Eqns eqns) = pretty_equations const (map fst eqns)
haftmann@35226
   987
      | pretty_function (const, Proj (proj, _)) = Pretty.block
haftmann@35226
   988
          [Pretty.str (string_of_const thy const), Pretty.fbrk, Syntax.pretty_term ctxt proj]
haftmann@35226
   989
      | pretty_function (const, Abstr (thm, _)) = pretty_equations const [thm];
haftmann@35226
   990
    fun pretty_typ (tyco, vs) = Pretty.str
haftmann@35226
   991
      (string_of_typ thy (Type (tyco, map TFree vs)));
haftmann@35226
   992
    fun pretty_typspec (typ, (cos, abstract)) = if null cos
haftmann@35226
   993
      then pretty_typ typ
haftmann@35226
   994
      else (Pretty.block o Pretty.breaks) (
haftmann@35226
   995
        pretty_typ typ
haftmann@35226
   996
        :: Pretty.str "="
haftmann@35226
   997
        :: (if abstract then [Pretty.str "(abstract)"] else [])
haftmann@40726
   998
        @ separate (Pretty.str "|") (map (fn (c, (_, [])) => Pretty.str (string_of_const thy c)
haftmann@40726
   999
             | (c, (_, tys)) =>
haftmann@35226
  1000
                 (Pretty.block o Pretty.breaks)
haftmann@35226
  1001
                    (Pretty.str (string_of_const thy c)
haftmann@35226
  1002
                      :: Pretty.str "of"
haftmann@35226
  1003
                      :: map (Pretty.quote o Syntax.pretty_typ_global thy) tys)) cos)
haftmann@35226
  1004
      );
haftmann@37438
  1005
    fun pretty_case (const, ((_, (_, [])), _)) = Pretty.str (string_of_const thy const)
haftmann@37438
  1006
      | pretty_case (const, ((_, (_, cos)), _)) = (Pretty.block o Pretty.breaks) [
haftmann@34901
  1007
          Pretty.str (string_of_const thy const), Pretty.str "with",
haftmann@34901
  1008
          (Pretty.block o Pretty.commas o map (Pretty.str o string_of_const thy)) cos];
haftmann@35226
  1009
    val functions = the_functions exec
haftmann@24423
  1010
      |> Symtab.dest
haftmann@28695
  1011
      |> (map o apsnd) (snd o fst)
haftmann@24219
  1012
      |> sort (string_ord o pairself fst);
haftmann@35299
  1013
    val datatypes = the_types exec
haftmann@24219
  1014
      |> Symtab.dest
haftmann@35226
  1015
      |> map (fn (tyco, (_, (vs, spec)) :: _) =>
haftmann@35226
  1016
          ((tyco, vs), constructors_of spec))
haftmann@35226
  1017
      |> sort (string_ord o pairself (fst o fst));
haftmann@34901
  1018
    val cases = Symtab.dest ((fst o the_cases o the_exec) thy);
haftmann@34901
  1019
    val undefineds = Symtab.keys ((snd o the_cases o the_exec) thy);
haftmann@24219
  1020
  in
haftmann@24219
  1021
    (Pretty.writeln o Pretty.chunks) [
haftmann@24219
  1022
      Pretty.block (
haftmann@34901
  1023
        Pretty.str "code equations:" :: Pretty.fbrk
haftmann@35226
  1024
        :: (Pretty.fbreaks o map pretty_function) functions
haftmann@24219
  1025
      ),
haftmann@25968
  1026
      Pretty.block (
haftmann@34901
  1027
        Pretty.str "datatypes:" :: Pretty.fbrk
haftmann@35226
  1028
        :: (Pretty.fbreaks o map pretty_typspec) datatypes
haftmann@34901
  1029
      ),
haftmann@34901
  1030
      Pretty.block (
haftmann@34901
  1031
        Pretty.str "cases:" :: Pretty.fbrk
haftmann@34901
  1032
        :: (Pretty.fbreaks o map pretty_case) cases
haftmann@34901
  1033
      ),
haftmann@34901
  1034
      Pretty.block (
haftmann@34901
  1035
        Pretty.str "undefined:" :: Pretty.fbrk
haftmann@34901
  1036
        :: (Pretty.commas o map (Pretty.str o string_of_const thy)) undefineds
haftmann@24219
  1037
      )
haftmann@24219
  1038
    ]
haftmann@24219
  1039
  end;
haftmann@24219
  1040
haftmann@24219
  1041
haftmann@31962
  1042
(** declaring executable ingredients **)
haftmann@31962
  1043
haftmann@33940
  1044
(* constant signatures *)
haftmann@33940
  1045
haftmann@33940
  1046
fun add_type tyco thy =
haftmann@33940
  1047
  case Symtab.lookup ((snd o #types o Type.rep_tsig o Sign.tsig_of) thy) tyco
haftmann@33940
  1048
   of SOME (Type.Abbreviation (vs, _, _)) =>
haftmann@34173
  1049
          (map_exec_purge o map_signatures o apfst)
haftmann@33940
  1050
            (Symtab.update (tyco, length vs)) thy
haftmann@33940
  1051
    | _ => error ("No such type abbreviation: " ^ quote tyco);
haftmann@33940
  1052
haftmann@33940
  1053
fun add_type_cmd s thy = add_type (Sign.intern_type thy s) thy;
haftmann@33940
  1054
haftmann@33940
  1055
fun gen_add_signature prep_const prep_signature (raw_c, raw_ty) thy =
haftmann@33940
  1056
  let
haftmann@33940
  1057
    val c = prep_const thy raw_c;
haftmann@33940
  1058
    val ty = prep_signature thy raw_ty;
haftmann@33940
  1059
    val ty' = expand_signature thy ty;
haftmann@33940
  1060
    val ty'' = Sign.the_const_type thy c;
haftmann@33940
  1061
    val _ = if typ_equiv (ty', ty'') then () else
haftmann@33940
  1062
      error ("Illegal constant signature: " ^ Syntax.string_of_typ_global thy ty);
haftmann@33940
  1063
  in
haftmann@33940
  1064
    thy
haftmann@34173
  1065
    |> (map_exec_purge o map_signatures o apsnd) (Symtab.update (c, ty))
haftmann@33940
  1066
  end;
haftmann@33940
  1067
haftmann@33940
  1068
val add_signature = gen_add_signature (K I) cert_signature;
haftmann@33940
  1069
val add_signature_cmd = gen_add_signature read_const read_signature;
haftmann@33940
  1070
haftmann@33940
  1071
haftmann@31962
  1072
(* code equations *)
haftmann@31962
  1073
haftmann@35226
  1074
fun gen_add_eqn default (raw_thm, proper) thy =
haftmann@33075
  1075
  let
haftmann@35226
  1076
    val thm = Thm.close_derivation raw_thm;
haftmann@35226
  1077
    val c = const_eqn thy thm;
haftmann@37460
  1078
    fun update_subsume thy (thm, proper) eqns = 
haftmann@37460
  1079
      let
haftmann@39811
  1080
        val args_of = snd o chop_while is_Var o rev o snd o strip_comb
haftmann@39791
  1081
          o map_types Type.strip_sorts o fst o Logic.dest_equals o Thm.plain_prop_of;
haftmann@37460
  1082
        val args = args_of thm;
haftmann@37460
  1083
        val incr_idx = Logic.incr_indexes ([], Thm.maxidx_of thm + 1);
haftmann@39794
  1084
        fun matches_args args' =
haftmann@39794
  1085
          let
haftmann@39794
  1086
            val k = length args' - length args
haftmann@39794
  1087
          in if k >= 0
haftmann@39794
  1088
            then Pattern.matchess thy (args, (map incr_idx o drop k) args')
haftmann@39794
  1089
            else false
haftmann@39794
  1090
          end;
haftmann@37460
  1091
        fun drop (thm', proper') = if (proper orelse not proper')
haftmann@37460
  1092
          andalso matches_args (args_of thm') then 
haftmann@37460
  1093
            (warning ("Code generator: dropping subsumed code equation\n" ^
haftmann@37460
  1094
                Display.string_of_thm_global thy thm'); true)
haftmann@37460
  1095
          else false;
haftmann@37460
  1096
      in (thm, proper) :: filter_out drop eqns end;
haftmann@37460
  1097
    fun natural_order thy_ref eqns =
haftmann@37460
  1098
      (eqns, Lazy.lazy (fn () => fold (update_subsume (Theory.deref thy_ref)) eqns []))
haftmann@37460
  1099
    fun add_eqn' true (Default (eqns, _)) =
haftmann@37460
  1100
          Default (natural_order (Theory.check_thy thy) ((thm, proper) :: eqns))
haftmann@37460
  1101
          (*this restores the natural order and drops syntactic redundancies*)
haftmann@39794
  1102
      | add_eqn' true fun_spec = fun_spec
haftmann@39794
  1103
      | add_eqn' false (Eqns eqns) = Eqns (update_subsume thy (thm, proper) eqns)
haftmann@35226
  1104
      | add_eqn' false _ = Eqns [(thm, proper)];
haftmann@35226
  1105
  in change_fun_spec false c (add_eqn' default) thy end;
haftmann@31962
  1106
haftmann@31962
  1107
fun add_eqn thm thy =
haftmann@31962
  1108
  gen_add_eqn false (mk_eqn thy (thm, true)) thy;
haftmann@31962
  1109
haftmann@31962
  1110
fun add_warning_eqn thm thy =
haftmann@31962
  1111
  case mk_eqn_warning thy thm
haftmann@31962
  1112
   of SOME eqn => gen_add_eqn false eqn thy
haftmann@31962
  1113
    | NONE => thy;
haftmann@31962
  1114
haftmann@37425
  1115
fun add_nbe_eqn thm thy =
haftmann@37425
  1116
  gen_add_eqn false (mk_eqn thy (thm, false)) thy;
haftmann@37425
  1117
haftmann@31962
  1118
fun add_default_eqn thm thy =
haftmann@31962
  1119
  case mk_eqn_liberal thy thm
haftmann@31962
  1120
   of SOME eqn => gen_add_eqn true eqn thy
haftmann@31962
  1121
    | NONE => thy;
haftmann@31962
  1122
haftmann@31962
  1123
val add_default_eqn_attribute = Thm.declaration_attribute
haftmann@31962
  1124
  (fn thm => Context.mapping (add_default_eqn thm) I);
haftmann@31962
  1125
val add_default_eqn_attrib = Attrib.internal (K add_default_eqn_attribute);
haftmann@31962
  1126
haftmann@37425
  1127
fun add_nbe_default_eqn thm thy =
haftmann@37425
  1128
  gen_add_eqn true (mk_eqn thy (thm, false)) thy;
haftmann@37425
  1129
haftmann@37425
  1130
val add_nbe_default_eqn_attribute = Thm.declaration_attribute
haftmann@37425
  1131
  (fn thm => Context.mapping (add_nbe_default_eqn thm) I);
haftmann@37425
  1132
val add_nbe_default_eqn_attrib = Attrib.internal (K add_nbe_default_eqn_attribute);
haftmann@37425
  1133
haftmann@35226
  1134
fun add_abs_eqn raw_thm thy =
haftmann@35226
  1135
  let
haftmann@35226
  1136
    val (abs_thm, tyco) = (apfst Thm.close_derivation o mk_abs_eqn thy) raw_thm;
haftmann@35226
  1137
    val c = const_abs_eqn thy abs_thm;
haftmann@35226
  1138
  in change_fun_spec false c (K (Abstr (abs_thm, tyco))) thy end;
haftmann@35226
  1139
haftmann@31962
  1140
fun del_eqn thm thy = case mk_eqn_liberal thy thm
haftmann@35226
  1141
 of SOME (thm, _) => let
haftmann@40758
  1142
        fun del_eqn' (Default _) = empty_fun_spec
haftmann@35226
  1143
          | del_eqn' (Eqns eqns) =
haftmann@35226
  1144
              Eqns (filter_out (fn (thm', _) => Thm.eq_thm_prop (thm, thm')) eqns)
haftmann@35226
  1145
          | del_eqn' spec = spec
haftmann@35226
  1146
      in change_fun_spec true (const_eqn thy thm) del_eqn' thy end
haftmann@31962
  1147
  | NONE => thy;
haftmann@31962
  1148
haftmann@35226
  1149
fun del_eqns c = change_fun_spec true c (K empty_fun_spec);
haftmann@34244
  1150
haftmann@34244
  1151
haftmann@34244
  1152
(* cases *)
haftmann@34244
  1153
haftmann@40758
  1154
fun case_cong thy case_const (num_args, (pos, _)) =
haftmann@37438
  1155
  let
wenzelm@43326
  1156
    val ([x, y], ctxt) = fold_map Name.variant ["A", "A'"] Name.context;
wenzelm@43326
  1157
    val (zs, _) = fold_map Name.variant (replicate (num_args - 1) "") ctxt;
haftmann@37438
  1158
    val (ws, vs) = chop pos zs;
haftmann@37448
  1159
    val T = Logic.unvarifyT_global (Sign.the_const_type thy case_const);
wenzelm@40844
  1160
    val Ts = binder_types T;
haftmann@37438
  1161
    val T_cong = nth Ts pos;
haftmann@37438
  1162
    fun mk_prem z = Free (z, T_cong);
haftmann@37438
  1163
    fun mk_concl z = list_comb (Const (case_const, T), map2 (curry Free) (ws @ z :: vs) Ts);
haftmann@37438
  1164
    val (prem, concl) = pairself Logic.mk_equals (pairself mk_prem (x, y), pairself mk_concl (x, y));
haftmann@37521
  1165
    fun tac { context, prems } = Simplifier.rewrite_goals_tac prems
wenzelm@42360
  1166
      THEN ALLGOALS (Proof_Context.fact_tac [Drule.reflexive_thm]);
haftmann@37438
  1167
  in Skip_Proof.prove_global thy (x :: y :: zs) [prem] concl tac end;
haftmann@37438
  1168
haftmann@34244
  1169
fun add_case thm thy =
haftmann@34244
  1170
  let
haftmann@43634
  1171
    val (case_const, (k, cos)) = case_cert thm;
haftmann@43634
  1172
    val _ = case filter_out (is_constr thy) cos
haftmann@34244
  1173
     of [] => ()
haftmann@34244
  1174
      | cs => error ("Non-constructor(s) in case certificate: " ^ commas (map quote cs));
haftmann@43634
  1175
    val entry = (1 + Int.max (1, length cos), (k, cos));
haftmann@43634
  1176
    fun register_case cong = (map_cases o apfst)
haftmann@43634
  1177
      (Symtab.update (case_const, (entry, cong)));
haftmann@43634
  1178
    fun register_for_constructors (Constructors (cos', cases)) =
haftmann@43634
  1179
         Constructors (cos',
haftmann@43634
  1180
           if exists (fn (co, _) => member (op =) cos co) cos'
haftmann@43634
  1181
           then insert (op =) case_const cases
haftmann@43634
  1182
           else cases)
haftmann@43634
  1183
      | register_for_constructors (x as Abstractor _) = x;
haftmann@43634
  1184
    val register_type = (map_typs o Symtab.map)
haftmann@43634
  1185
      (K ((map o apsnd o apsnd) register_for_constructors));
haftmann@37438
  1186
  in
haftmann@37438
  1187
    thy
haftmann@37438
  1188
    |> Theory.checkpoint
haftmann@37438
  1189
    |> `(fn thy => case_cong thy case_const entry)
haftmann@43634
  1190
    |-> (fn cong => map_exec_purge (register_case cong #> register_type))
haftmann@37438
  1191
  end;
haftmann@34244
  1192
haftmann@34244
  1193
fun add_undefined c thy =
haftmann@34244
  1194
  (map_exec_purge o map_cases o apsnd) (Symtab.update (c, ())) thy;
haftmann@34244
  1195
haftmann@34244
  1196
haftmann@35299
  1197
(* types *)
haftmann@34244
  1198
haftmann@35299
  1199
fun register_type (tyco, vs_spec) thy =
haftmann@34244
  1200
  let
haftmann@35226
  1201
    val (old_constrs, some_old_proj) =
haftmann@35299
  1202
      case these (Symtab.lookup ((the_types o the_exec) thy) tyco)
haftmann@43634
  1203
       of (_, (_, Constructors (cos, _))) :: _ => (map fst cos, NONE)
haftmann@36209
  1204
        | (_, (_, Abstractor ((co, _), (proj, _)))) :: _ => ([co], SOME proj)
haftmann@43636
  1205
        | [] => ([], NONE);
haftmann@43636
  1206
    val outdated_funs1 = (map fst o fst o constructors_of o snd) vs_spec;
haftmann@43636
  1207
    val outdated_funs2 = case some_old_proj
haftmann@43636
  1208
     of NONE => []
haftmann@35226
  1209
      | SOME old_proj => Symtab.fold
haftmann@36209
  1210
          (fn (c, ((_, spec), _)) =>
haftmann@36209
  1211
            if member (op =) (the_list (associated_abstype spec)) tyco
haftmann@35226
  1212
            then insert (op =) c else I)
haftmann@43637
  1213
            ((the_functions o the_exec) thy) [old_proj];
haftmann@34244
  1214
    fun drop_outdated_cases cases = fold Symtab.delete_safe
haftmann@37438
  1215
      (Symtab.fold (fn (c, ((_, (_, cos)), _)) =>
haftmann@35226
  1216
        if exists (member (op =) old_constrs) cos
haftmann@34244
  1217
          then insert (op =) c else I) cases []) cases;
haftmann@34244
  1218
  in
haftmann@34244
  1219
    thy
haftmann@43636
  1220
    |> fold del_eqns (outdated_funs1 @ outdated_funs2)
haftmann@34244
  1221
    |> map_exec_purge
haftmann@35226
  1222
        ((map_typs o Symtab.map_default (tyco, [])) (cons (serial (), vs_spec))
haftmann@34244
  1223
        #> (map_cases o apfst) drop_outdated_cases)
haftmann@34244
  1224
  end;
haftmann@34244
  1225
haftmann@35299
  1226
fun unoverload_const_typ thy (c, ty) = (AxClass.unoverload_const thy (c, ty), ty);
haftmann@34244
  1227
haftmann@35299
  1228
structure Datatype_Interpretation =
haftmann@35299
  1229
  Interpretation(type T = string * serial val eq = eq_snd (op =) : T * T -> bool);
haftmann@35299
  1230
haftmann@35299
  1231
fun datatype_interpretation f = Datatype_Interpretation.interpretation
haftmann@40726
  1232
  (fn (tyco, _) => fn thy => f (tyco, fst (get_type thy tyco)) thy);
haftmann@35226
  1233
haftmann@35226
  1234
fun add_datatype proto_constrs thy =
haftmann@35226
  1235
  let
haftmann@35226
  1236
    val constrs = map (unoverload_const_typ thy) proto_constrs;
haftmann@35226
  1237
    val (tyco, (vs, cos)) = constrset_of_consts thy constrs;
haftmann@35226
  1238
  in
haftmann@35226
  1239
    thy
haftmann@43634
  1240
    |> register_type (tyco, (vs, Constructors (cos, [])))
haftmann@35299
  1241
    |> Datatype_Interpretation.data (tyco, serial ())
haftmann@35226
  1242
  end;
haftmann@35226
  1243
haftmann@35226
  1244
fun add_datatype_cmd raw_constrs thy =
haftmann@35226
  1245
  add_datatype (map (read_bare_const thy) raw_constrs) thy;
haftmann@35226
  1246
haftmann@35299
  1247
structure Abstype_Interpretation =
haftmann@35299
  1248
  Interpretation(type T = string * serial val eq = eq_snd (op =) : T * T -> bool);
haftmann@35299
  1249
haftmann@35299
  1250
fun abstype_interpretation f = Abstype_Interpretation.interpretation
haftmann@35299
  1251
  (fn (tyco, _) => fn thy => f (tyco, get_abstype_spec thy tyco) thy);
haftmann@35299
  1252
haftmann@36112
  1253
fun add_abstype proto_thm thy =
haftmann@34244
  1254
  let
haftmann@40726
  1255
    val (tyco, (vs, (abs_ty as (abs, (_, ty)), (rep, cert)))) =
haftmann@36209
  1256
      error_thm (check_abstype_cert thy) proto_thm;
haftmann@35226
  1257
  in
haftmann@35226
  1258
    thy
haftmann@36112
  1259
    |> register_type (tyco, (vs, Abstractor (abs_ty, (rep, cert))))
haftmann@36112
  1260
    |> change_fun_spec false rep ((K o Proj)
haftmann@36112
  1261
        (map_types Logic.varifyT_global (mk_proj tyco vs ty abs rep), tyco))
haftmann@36112
  1262
    |> Abstype_Interpretation.data (tyco, serial ())
haftmann@35226
  1263
  end;
haftmann@34244
  1264
haftmann@35226
  1265
haftmann@35226
  1266
(** infrastructure **)
haftmann@34244
  1267
wenzelm@41472
  1268
(* cf. src/HOL/Tools/recfun_codegen.ML *)
haftmann@32070
  1269
wenzelm@33522
  1270
structure Code_Target_Attr = Theory_Data
wenzelm@33522
  1271
(
haftmann@31998
  1272
  type T = (string -> thm -> theory -> theory) option;
haftmann@31998
  1273
  val empty = NONE;
haftmann@31998
  1274
  val extend = I;
wenzelm@41493
  1275
  val merge = merge_options;
haftmann@31998
  1276
);
haftmann@31998
  1277
haftmann@32070
  1278
fun set_code_target_attr f = Code_Target_Attr.map (K (SOME f));
haftmann@32070
  1279
haftmann@32070
  1280
fun code_target_attr prefix thm thy =
haftmann@32070
  1281
  let
haftmann@32070
  1282
    val attr = the_default ((K o K) I) (Code_Target_Attr.get thy);
haftmann@32070
  1283
  in thy |> add_warning_eqn thm |> attr prefix thm end;
haftmann@35226
  1284
haftmann@35226
  1285
haftmann@32070
  1286
(* setup *)
haftmann@31998
  1287
haftmann@31962
  1288
val _ = Context.>> (Context.map_theory
haftmann@31962
  1289
  (let
haftmann@31962
  1290
    fun mk_attribute f = Thm.declaration_attribute (fn thm => Context.mapping (f thm) I);
haftmann@31998
  1291
    val code_attribute_parser =
haftmann@31998
  1292
      Args.del |-- Scan.succeed (mk_attribute del_eqn)
haftmann@31998
  1293
      || Args.$$$ "nbe" |-- Scan.succeed (mk_attribute add_nbe_eqn)
haftmann@36112
  1294
      || Args.$$$ "abstype" |-- Scan.succeed (mk_attribute add_abstype)
haftmann@35226
  1295
      || Args.$$$ "abstract" |-- Scan.succeed (mk_attribute add_abs_eqn)
haftmann@31998
  1296
      || (Args.$$$ "target" |-- Args.colon |-- Args.name >>
haftmann@32070
  1297
           (mk_attribute o code_target_attr))
haftmann@31998
  1298
      || Scan.succeed (mk_attribute add_warning_eqn);
haftmann@31962
  1299
  in
haftmann@35299
  1300
    Datatype_Interpretation.init
haftmann@31998
  1301
    #> Attrib.setup (Binding.name "code") (Scan.lift code_attribute_parser)
haftmann@31998
  1302
        "declare theorems for code generation"
haftmann@31962
  1303
  end));
haftmann@31962
  1304
haftmann@24219
  1305
end; (*struct*)
haftmann@24219
  1306
haftmann@24219
  1307
haftmann@35226
  1308
(* type-safe interfaces for data dependent on executable code *)
haftmann@24219
  1309
haftmann@34173
  1310
functor Code_Data(Data: CODE_DATA_ARGS): CODE_DATA =
haftmann@24219
  1311
struct
haftmann@24219
  1312
haftmann@24219
  1313
type T = Data.T;
haftmann@24219
  1314
exception Data of T;
haftmann@24219
  1315
fun dest (Data x) = x
haftmann@24219
  1316
haftmann@34173
  1317
val kind = Code.declare_data (Data Data.empty);
haftmann@24219
  1318
haftmann@24219
  1319
val data_op = (kind, Data, dest);
haftmann@24219
  1320
haftmann@39397
  1321
fun change_yield (SOME thy) f = Code.change_yield_data data_op thy f
haftmann@39397
  1322
  | change_yield NONE f = f Data.empty
haftmann@39397
  1323
haftmann@39397
  1324
fun change some_thy f = snd (change_yield some_thy (pair () o f));
haftmann@24219
  1325
haftmann@24219
  1326
end;
haftmann@24219
  1327
haftmann@28143
  1328
structure Code : CODE = struct open Code; end;