src/Pure/Isar/code.ML
author haftmann
Mon Aug 10 12:25:30 2009 +0200 (2009-08-10 ago)
changeset 32354 bb40e900e1f3
parent 32347 36017d1ea1b3
child 32544 e129333b9df0
permissions -rw-r--r--
same_typscheme replaces ugly common_typ_eqns
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(*  Title:      Pure/Isar/code.ML
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    Author:     Florian Haftmann, TU Muenchen
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Abstract executable code of theory.  Management of data dependent on
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executable code.  Cache assumes non-concurrent processing of a single theory.
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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 args_number: theory -> string -> int
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  val typscheme: theory -> string * typ -> (string * sort) list * typ
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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 * typ list) list)
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  (*constant aliasses*)
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  val add_const_alias: thm -> theory -> theory
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  val triv_classes: theory -> class list
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  val resubst_alias: theory -> string -> string
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  (*code equations*)
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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 assert_eqns_const: theory -> string
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    -> (thm * bool) list -> (thm * bool) list
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  val const_typ_eqn: theory -> thm -> string * typ
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  val typscheme_eqn: theory -> thm -> (string * sort) list * typ
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  (*executable code*)
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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 type_interpretation:
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    (string * ((string * sort) list * (string * typ list) list)
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      -> theory -> theory) -> theory -> theory
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  val add_eqn: thm -> theory -> theory
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  val add_eqnl: string * (thm * bool) list lazy -> 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 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_datatype: theory -> string -> ((string * sort) list * (string * typ list) list)
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  val get_datatype_of_constr: theory -> string -> string option
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  val these_eqns: theory -> string -> (thm * bool) list
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  val all_eqns: theory -> (thm * bool) list
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  val get_case_scheme: theory -> string -> (int * (int * string list)) 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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  val purge_data: 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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  val purge: theory -> string list -> T -> 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 get: theory -> T
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  val change: theory -> (T -> T) -> T
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  val change_yield: theory -> (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 -> (theory -> string list -> Object.T -> Object.T)
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    -> serial
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  val get_data: serial * ('a -> Object.T) * (Object.T -> 'a)
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    -> theory -> 'a
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  val change_data: serial * ('a -> Object.T) * (Object.T -> 'a)
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    -> theory -> ('a -> 'a) -> 'a
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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 = setmp show_sorts true (Syntax.string_of_typ_global thy);
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fun string_of_const thy c = case AxClass.inst_of_param thy c
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 of SOME (c, tyco) => Sign.extern_const thy c ^ " " ^ enclose "[" "]" (Sign.extern_type thy tyco)
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  | NONE => Sign.extern_const thy c;
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(* constants *)
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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_const thy = AxClass.unoverload_const 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 = AxClass.unoverload_const thy o read_bare_const thy;
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fun typscheme thy (c, ty) =
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  let
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    val ty' = Logic.unvarifyT ty;
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  in (map dest_TFree (Sign.const_typargs thy (c, ty')), Type.strip_sorts ty') end;
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(** data store **)
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(* code equations *)
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type eqns = bool * (thm * bool) list lazy;
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  (*default flag, theorems with proper flag (perhaps lazy)*)
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fun pretty_lthms ctxt r = case Lazy.peek r
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 of SOME thms => map (Display.pretty_thm ctxt o fst) (Exn.release thms)
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  | NONE => [Pretty.str "[...]"];
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fun certificate thy f r =
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  case Lazy.peek r
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   of SOME thms => (Lazy.value o f thy) (Exn.release thms)
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    | NONE => let
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        val thy_ref = Theory.check_thy thy;
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      in Lazy.lazy (fn () => (f (Theory.deref thy_ref) o Lazy.force) r) end;
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fun add_drop_redundant thy (thm, proper) thms =
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  let
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    val args_of = snd o strip_comb o map_types Type.strip_sorts
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      o fst o Logic.dest_equals o Thm.plain_prop_of;
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    val args = args_of thm;
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    val incr_idx = Logic.incr_indexes ([], Thm.maxidx_of thm + 1);
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    fun matches_args args' = length args <= length args' andalso
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      Pattern.matchess thy (args, (map incr_idx o curry Library.take (length args)) args');
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    fun drop (thm', proper') = if (proper orelse not proper')
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      andalso matches_args (args_of thm') then 
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        (warning ("Code generator: dropping redundant code equation\n" ^
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            Display.string_of_thm_global thy thm'); true)
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      else false;
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  in (thm, proper) :: filter_out drop thms end;
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fun add_thm thy _ thm (false, thms) = (false, Lazy.map_force (add_drop_redundant thy thm) thms)
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  | add_thm thy true thm (true, thms) = (true, Lazy.map_force (fn thms => thms @ [thm]) thms)
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  | add_thm thy false thm (true, thms) = (false, Lazy.value [thm]);
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fun add_lthms lthms _ = (false, lthms);
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fun del_thm thm = (apsnd o Lazy.map_force) (remove (eq_fst Thm.eq_thm_prop) (thm, true));
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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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  aliasses: ((string * string) * thm) list * class list,
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  eqns: ((bool * eqns) * (serial * eqns) list) Symtab.table
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    (*with explicit history*),
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  dtyps: ((serial * ((string * sort) list * (string * typ list) list)) list) Symtab.table
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    (*with explicit history*),
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  cases: (int * (int * string list)) Symtab.table * unit Symtab.table
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};
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fun make_spec ((history_concluded, aliasses), (eqns, (dtyps, cases))) =
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  Spec { history_concluded = history_concluded, aliasses = aliasses,
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    eqns = eqns, dtyps = dtyps, cases = cases };
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fun map_spec f (Spec { history_concluded = history_concluded, aliasses = aliasses, eqns = eqns,
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  dtyps = dtyps, cases = cases }) =
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  make_spec (f ((history_concluded, aliasses), (eqns, (dtyps, cases))));
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fun merge_spec (Spec { history_concluded = _, aliasses = aliasses1, eqns = eqns1,
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    dtyps = dtyps1, cases = (cases1, undefs1) },
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  Spec { history_concluded = _, aliasses = aliasses2, eqns = eqns2,
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    dtyps = dtyps2, cases = (cases2, undefs2) }) =
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  let
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    val aliasses = (Library.merge (eq_snd Thm.eq_thm_prop) (pairself fst (aliasses1, aliasses2)),
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      Library.merge (op =) (pairself snd (aliasses1, aliasses2)));
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    fun merge_eqns ((_, 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 (fst 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 eqns = Symtab.join (K merge_eqns) (eqns1, eqns2);
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    val dtyps = Symtab.join (K (AList.merge (op =) (K true))) (dtyps1, dtyps2);
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    val cases = (Symtab.merge (K true) (cases1, cases2),
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      Symtab.merge (K true) (undefs1, undefs2));
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  in make_spec ((false, aliasses), (eqns, (dtyps, cases))) end;
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fun history_concluded (Spec { history_concluded, ... }) = history_concluded;
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fun the_aliasses (Spec { aliasses, ... }) = aliasses;
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fun the_eqns (Spec { eqns, ... }) = eqns;
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fun the_dtyps (Spec { dtyps, ... }) = dtyps;
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fun the_cases (Spec { cases, ... }) = cases;
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val map_history_concluded = map_spec o apfst o apfst;
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val map_aliasses = map_spec o apfst o apsnd;
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val map_eqns = map_spec o apsnd o apfst;
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val map_dtyps = 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 = {
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  empty: Object.T,
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  purge: theory -> string list -> Object.T -> Object.T
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};
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val kinds = ref (Datatab.empty: kind Datatab.table);
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val kind_keys = ref ([]: serial list);
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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 => sys_error "Invalid code data identifier";
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in
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fun declare_data empty purge =
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  let
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    val k = serial ();
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    val kind = {empty = empty, purge = purge};
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    val _ = change kinds (Datatab.update (k, kind));
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    val _ = change kind_keys (cons k);
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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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fun invoke_purge_all thy cs =
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  fold (fn k => Datatab.map_entry k
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    (invoke (fn kind => #purge kind thy cs) k)) (! kind_keys);
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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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val empty_data = Datatab.empty : data;
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structure Code_Data = TheoryDataFun
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(
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  type T = spec * data ref;
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  val empty = (make_spec ((false, ([], [])),
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    (Symtab.empty, (Symtab.empty, (Symtab.empty, Symtab.empty)))), ref empty_data);
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  fun copy (spec, data) = (spec, ref (! data));
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  val extend = copy;
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  fun merge pp ((spec1, data1), (spec2, data2)) =
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    (merge_spec (spec1, spec2), ref empty_data);
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);
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fun thy_data f thy = f ((snd o Code_Data.get) thy);
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fun get_ensure_init kind data_ref =
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  case Datatab.lookup (! data_ref) kind
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   of SOME x => x
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    | NONE => let val y = invoke_init kind
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        in (change data_ref (Datatab.update (kind, y)); y) end;
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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 complete_class_params thy cs =
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  fold (fn c => case AxClass.inst_of_param thy c
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   of NONE => insert (op =) c
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    | SOME (c', _) => insert (op =) c' #> insert (op =) c) cs [];
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fun map_exec_purge touched f thy =
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  Code_Data.map (fn (exec, data) => (f exec, ref (case touched
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   of SOME cs => invoke_purge_all thy (complete_class_params thy cs) (! data)
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    | NONE => empty_data))) thy;
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val purge_data = (Code_Data.map o apsnd) (K (ref empty_data));
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fun change_eqns delete c f = (map_exec_purge (SOME [c]) o map_eqns
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  o (if delete then Symtab.map_entry c else Symtab.map_default (c, ((false, (true, Lazy.value [])), [])))
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    o apfst) (fn (_, eqns) => (true, f eqns));
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fun del_eqns c = change_eqns true c (K (false, Lazy.value []));
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(* tackling equation history *)
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fun get_eqns thy c =
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  Symtab.lookup ((the_eqns o the_exec) thy) c
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  |> Option.map (Lazy.force o snd o snd o fst)
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  |> these;
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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_eqns o Symtab.map) (fn ((changed, current), history) =>
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          ((false, current),
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            if changed then (serial (), current) :: history else history))
haftmann@31962
   328
        #> map_history_concluded (K true))
haftmann@31962
   329
    |> SOME;
haftmann@31962
   330
haftmann@31962
   331
val _ = Context.>> (Context.map_theory (Code_Data.init
haftmann@31962
   332
  #> Theory.at_begin continue_history
haftmann@31962
   333
  #> Theory.at_end conclude_history));
haftmann@31962
   334
haftmann@31962
   335
haftmann@31962
   336
(* access to data dependent on abstract executable code *)
haftmann@31962
   337
haftmann@31962
   338
fun get_data (kind, _, dest) = thy_data (get_ensure_init kind #> dest);
haftmann@31962
   339
haftmann@31962
   340
fun change_data (kind, mk, dest) =
haftmann@31962
   341
  let
haftmann@31962
   342
    fun chnge data_ref f =
haftmann@31962
   343
      let
haftmann@31962
   344
        val data = get_ensure_init kind data_ref;
haftmann@31962
   345
        val data' = f (dest data);
haftmann@31962
   346
      in (change data_ref (Datatab.update (kind, mk data')); data') end;
haftmann@31962
   347
  in thy_data chnge end;
haftmann@31962
   348
haftmann@31962
   349
fun change_yield_data (kind, mk, dest) =
haftmann@31962
   350
  let
haftmann@31962
   351
    fun chnge data_ref f =
haftmann@31962
   352
      let
haftmann@31962
   353
        val data = get_ensure_init kind data_ref;
haftmann@31962
   354
        val (x, data') = f (dest data);
haftmann@31962
   355
      in (x, (change data_ref (Datatab.update (kind, mk data')); data')) end;
haftmann@31962
   356
  in thy_data chnge end;
haftmann@31962
   357
haftmann@31962
   358
end; (*local*)
haftmann@31962
   359
haftmann@31962
   360
haftmann@31962
   361
(** retrieval interfaces **)
haftmann@31962
   362
haftmann@31962
   363
(* constant aliasses *)
haftmann@31156
   364
haftmann@31156
   365
fun resubst_alias thy =
haftmann@31156
   366
  let
haftmann@31962
   367
    val alias = (fst o the_aliasses o the_exec) thy;
haftmann@31156
   368
    val subst_inst_param = Option.map fst o AxClass.inst_of_param thy;
haftmann@31156
   369
    fun subst_alias c =
haftmann@31156
   370
      get_first (fn ((c', c''), _) => if c = c'' then SOME c' else NONE) alias;
haftmann@31156
   371
  in
haftmann@31156
   372
    perhaps subst_inst_param
haftmann@31156
   373
    #> perhaps subst_alias
haftmann@31156
   374
  end;
haftmann@31156
   375
haftmann@31962
   376
val triv_classes = snd o the_aliasses o the_exec;
haftmann@31156
   377
haftmann@31156
   378
haftmann@31962
   379
(** foundation **)
haftmann@31962
   380
haftmann@31962
   381
(* constants *)
haftmann@31962
   382
haftmann@31962
   383
fun args_number thy = length o fst o strip_type o Sign.the_const_type thy;
haftmann@31962
   384
haftmann@31962
   385
haftmann@31962
   386
(* datatypes *)
haftmann@31156
   387
haftmann@31156
   388
fun constrset_of_consts thy cs =
haftmann@31156
   389
  let
haftmann@31156
   390
    val _ = map (fn (c, _) => if (is_some o AxClass.class_of_param thy) c
haftmann@31156
   391
      then error ("Is a class parameter: " ^ string_of_const thy c) else ()) cs;
haftmann@31156
   392
    fun no_constr (c, ty) = error ("Not a datatype constructor: " ^ string_of_const thy c
haftmann@31156
   393
      ^ " :: " ^ string_of_typ thy ty);
haftmann@31156
   394
    fun last_typ c_ty ty =
haftmann@31156
   395
      let
haftmann@31156
   396
        val frees = OldTerm.typ_tfrees ty;
haftmann@31156
   397
        val (tyco, vs) = ((apsnd o map) (dest_TFree) o dest_Type o snd o strip_type) ty
haftmann@31156
   398
          handle TYPE _ => no_constr c_ty
haftmann@31156
   399
        val _ = if has_duplicates (eq_fst (op =)) vs then no_constr c_ty else ();
haftmann@31156
   400
        val _ = if length frees <> length vs then no_constr c_ty else ();
haftmann@31156
   401
      in (tyco, vs) end;
haftmann@31156
   402
    fun ty_sorts (c, ty) =
haftmann@31156
   403
      let
haftmann@31156
   404
        val ty_decl = (Logic.unvarifyT o Sign.the_const_type thy) c;
haftmann@31156
   405
        val (tyco, _) = last_typ (c, ty) ty_decl;
haftmann@31156
   406
        val (_, vs) = last_typ (c, ty) ty;
haftmann@31156
   407
      in ((tyco, map snd vs), (c, (map fst vs, ty))) end;
haftmann@31156
   408
    fun add ((tyco', sorts'), c) ((tyco, sorts), cs) =
haftmann@31156
   409
      let
haftmann@31998
   410
        val _ = if (tyco' : string) <> tyco
haftmann@31156
   411
          then error "Different type constructors in constructor set"
haftmann@31156
   412
          else ();
haftmann@31156
   413
        val sorts'' = map2 (curry (Sorts.inter_sort (Sign.classes_of thy))) sorts' sorts
haftmann@31156
   414
      in ((tyco, sorts), c :: cs) end;
haftmann@31156
   415
    fun inst vs' (c, (vs, ty)) =
haftmann@31156
   416
      let
haftmann@31156
   417
        val the_v = the o AList.lookup (op =) (vs ~~ vs');
haftmann@31156
   418
        val ty' = map_atyps (fn TFree (v, _) => TFree (the_v v)) ty;
haftmann@31156
   419
      in (c, (fst o strip_type) ty') end;
haftmann@31156
   420
    val c' :: cs' = map ty_sorts cs;
haftmann@31156
   421
    val ((tyco, sorts), cs'') = fold add cs' (apsnd single c');
haftmann@31156
   422
    val vs = Name.names Name.context Name.aT sorts;
haftmann@31156
   423
    val cs''' = map (inst vs) cs'';
haftmann@31156
   424
  in (tyco, (vs, rev cs''')) end;
haftmann@31156
   425
haftmann@31962
   426
fun get_datatype thy tyco =
haftmann@31962
   427
  case these (Symtab.lookup ((the_dtyps o the_exec) thy) tyco)
haftmann@31962
   428
   of (_, spec) :: _ => spec
haftmann@31962
   429
    | [] => Sign.arity_number thy tyco
haftmann@31962
   430
        |> Name.invents Name.context Name.aT
haftmann@31962
   431
        |> map (rpair [])
haftmann@31962
   432
        |> rpair [];
haftmann@31962
   433
haftmann@31962
   434
fun get_datatype_of_constr thy c =
haftmann@31962
   435
  case (snd o strip_type o Sign.the_const_type thy) c
haftmann@31962
   436
   of Type (tyco, _) => if member (op =) ((map fst o snd o get_datatype thy) tyco) c
haftmann@31962
   437
       then SOME tyco else NONE
haftmann@31962
   438
    | _ => NONE;
haftmann@31962
   439
haftmann@31962
   440
fun is_constr thy = is_some o get_datatype_of_constr thy;
haftmann@31962
   441
haftmann@31156
   442
haftmann@31156
   443
(* code equations *)
haftmann@31156
   444
haftmann@31156
   445
exception BAD_THM of string;
haftmann@31156
   446
fun bad_thm msg = raise BAD_THM msg;
haftmann@31156
   447
fun error_thm f thm = f thm handle BAD_THM msg => error msg;
haftmann@31642
   448
fun warning_thm f thm = SOME (f thm) handle BAD_THM msg => (warning msg; NONE)
haftmann@31156
   449
fun try_thm f thm = SOME (f thm) handle BAD_THM _ => NONE;
haftmann@31156
   450
haftmann@31156
   451
fun is_linear thm =
haftmann@31156
   452
  let val (_, args) = (strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of) thm
haftmann@31156
   453
  in not (has_duplicates (op =) ((fold o fold_aterms)
haftmann@31156
   454
    (fn Var (v, _) => cons v | _ => I) args [])) end;
haftmann@31156
   455
haftmann@31962
   456
fun gen_assert_eqn thy is_constr_pat (thm, proper) =
haftmann@31156
   457
  let
haftmann@31156
   458
    val (lhs, rhs) = (Logic.dest_equals o Thm.plain_prop_of) thm
wenzelm@32091
   459
      handle TERM _ => bad_thm ("Not an equation: " ^ Display.string_of_thm_global thy thm)
wenzelm@32091
   460
           | THM _ => bad_thm ("Not an equation: " ^ Display.string_of_thm_global thy thm);
haftmann@31156
   461
    fun vars_of t = fold_aterms (fn Var (v, _) => insert (op =) v
haftmann@31156
   462
      | Free _ => bad_thm ("Illegal free variable in equation\n"
wenzelm@32091
   463
          ^ Display.string_of_thm_global thy thm)
haftmann@31156
   464
      | _ => I) t [];
haftmann@31156
   465
    fun tvars_of t = fold_term_types (fn _ =>
haftmann@31156
   466
      fold_atyps (fn TVar (v, _) => insert (op =) v
haftmann@31156
   467
        | TFree _ => bad_thm 
wenzelm@32091
   468
      ("Illegal free type variable in equation\n" ^ Display.string_of_thm_global thy thm))) t [];
haftmann@31156
   469
    val lhs_vs = vars_of lhs;
haftmann@31156
   470
    val rhs_vs = vars_of rhs;
haftmann@31156
   471
    val lhs_tvs = tvars_of lhs;
haftmann@31156
   472
    val rhs_tvs = tvars_of rhs;
haftmann@31156
   473
    val _ = if null (subtract (op =) lhs_vs rhs_vs)
haftmann@31156
   474
      then ()
haftmann@31156
   475
      else bad_thm ("Free variables on right hand side of equation\n"
wenzelm@32091
   476
        ^ Display.string_of_thm_global thy thm);
haftmann@31156
   477
    val _ = if null (subtract (op =) lhs_tvs rhs_tvs)
haftmann@31156
   478
      then ()
haftmann@31156
   479
      else bad_thm ("Free type variables on right hand side of equation\n"
wenzelm@32091
   480
        ^ Display.string_of_thm_global thy thm)
wenzelm@32091
   481
    val (head, args) = (strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of) thm;
haftmann@31156
   482
    val (c, ty) = case head
haftmann@31156
   483
     of Const (c_ty as (_, ty)) => (AxClass.unoverload_const thy c_ty, ty)
wenzelm@32091
   484
      | _ => bad_thm ("Equation not headed by constant\n" ^ Display.string_of_thm_global thy thm);
haftmann@31156
   485
    fun check _ (Abs _) = bad_thm
haftmann@31156
   486
          ("Abstraction on left hand side of equation\n"
wenzelm@32091
   487
            ^ Display.string_of_thm_global thy thm)
haftmann@31156
   488
      | check 0 (Var _) = ()
haftmann@31156
   489
      | check _ (Var _) = bad_thm
haftmann@31156
   490
          ("Variable with application on left hand side of equation\n"
wenzelm@32091
   491
            ^ Display.string_of_thm_global thy thm)
haftmann@31156
   492
      | check n (t1 $ t2) = (check (n+1) t1; check 0 t2)
haftmann@31156
   493
      | check n (Const (c_ty as (c, ty))) = if n = (length o fst o strip_type) ty
haftmann@31156
   494
          then if not proper orelse is_constr_pat (AxClass.unoverload_const thy c_ty)
haftmann@31156
   495
            then ()
haftmann@31156
   496
            else bad_thm (quote c ^ " is not a constructor, on left hand side of equation\n"
wenzelm@32091
   497
              ^ Display.string_of_thm_global thy thm)
haftmann@31156
   498
          else bad_thm
haftmann@31156
   499
            ("Partially applied constant " ^ quote c ^ " on left hand side of equation\n"
wenzelm@32091
   500
               ^ Display.string_of_thm_global thy thm);
haftmann@31156
   501
    val _ = map (check 0) args;
haftmann@31156
   502
    val _ = if not proper orelse is_linear thm then ()
haftmann@31156
   503
      else bad_thm ("Duplicate variables on left hand side of equation\n"
wenzelm@32091
   504
        ^ Display.string_of_thm_global thy thm);
haftmann@31156
   505
    val _ = if (is_none o AxClass.class_of_param thy) c
haftmann@31156
   506
      then ()
haftmann@31156
   507
      else bad_thm ("Polymorphic constant as head in equation\n"
wenzelm@32091
   508
        ^ Display.string_of_thm_global thy thm)
haftmann@31962
   509
    val _ = if not (is_constr thy c)
haftmann@31156
   510
      then ()
haftmann@31156
   511
      else bad_thm ("Constructor as head in equation\n"
wenzelm@32091
   512
        ^ Display.string_of_thm_global thy thm)
haftmann@31156
   513
    val ty_decl = Sign.the_const_type thy c;
haftmann@31156
   514
    val _ = if Sign.typ_equiv thy (Type.strip_sorts ty_decl, Type.strip_sorts ty)
haftmann@31156
   515
      then () else bad_thm ("Type\n" ^ string_of_typ thy ty
haftmann@31156
   516
           ^ "\nof equation\n"
wenzelm@32091
   517
           ^ Display.string_of_thm_global thy thm
haftmann@31156
   518
           ^ "\nis incompatible with declared function type\n"
haftmann@31156
   519
           ^ string_of_typ thy ty_decl)
haftmann@31156
   520
  in (thm, proper) end;
haftmann@31156
   521
haftmann@31962
   522
fun assert_eqn thy = error_thm (gen_assert_eqn thy (is_constr thy));
haftmann@31962
   523
haftmann@31962
   524
fun meta_rewrite thy = LocalDefs.meta_rewrite_rule (ProofContext.init thy);
haftmann@31156
   525
haftmann@31962
   526
fun mk_eqn thy = error_thm (gen_assert_eqn thy (K true)) o
haftmann@31962
   527
  apfst (meta_rewrite thy);
haftmann@31962
   528
haftmann@31962
   529
fun mk_eqn_warning thy = Option.map (fn (thm, _) => (thm, is_linear thm))
haftmann@31962
   530
  o warning_thm (gen_assert_eqn thy (K true)) o rpair false o meta_rewrite thy;
haftmann@31962
   531
haftmann@31962
   532
fun mk_eqn_liberal thy = Option.map (fn (thm, _) => (thm, is_linear thm))
haftmann@31962
   533
  o try_thm (gen_assert_eqn thy (K true)) o rpair false o meta_rewrite thy;
haftmann@31156
   534
haftmann@31156
   535
(*those following are permissive wrt. to overloaded constants!*)
haftmann@31156
   536
haftmann@31957
   537
fun const_typ_eqn thy thm =
haftmann@31156
   538
  let
haftmann@31957
   539
    val (c, ty) = (dest_Const o fst o strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of) thm;
haftmann@31156
   540
    val c' = AxClass.unoverload_const thy (c, ty);
haftmann@31156
   541
  in (c', ty) end;
haftmann@31156
   542
haftmann@31957
   543
fun typscheme_eqn thy = typscheme thy o const_typ_eqn thy;
haftmann@31957
   544
fun const_eqn thy = fst o const_typ_eqn thy;
haftmann@31156
   545
haftmann@31962
   546
fun assert_eqns_const thy c eqns =
haftmann@31962
   547
  let
haftmann@31962
   548
    fun cert (eqn as (thm, _)) = if c = const_eqn thy thm
haftmann@31962
   549
      then eqn else error ("Wrong head of code equation,\nexpected constant "
wenzelm@32091
   550
        ^ string_of_const thy c ^ "\n" ^ Display.string_of_thm_global thy thm)
haftmann@31962
   551
  in map (cert o assert_eqn thy) eqns end;
haftmann@31156
   552
haftmann@32354
   553
fun same_typscheme thy thms =
haftmann@32354
   554
  let
haftmann@32354
   555
    fun tvars_of t = rev (Term.add_tvars t []);
haftmann@32354
   556
    val vss = map (tvars_of o Thm.prop_of) thms;
haftmann@32354
   557
    fun inter_sorts vs =
haftmann@32354
   558
      fold (curry (Sorts.inter_sort (Sign.classes_of thy)) o snd) vs [];
haftmann@32354
   559
    val sorts = map_transpose inter_sorts vss;
haftmann@32354
   560
    val vts = Name.names Name.context Name.aT sorts
haftmann@32354
   561
      |> map (fn (v, sort) => TVar ((v, 0), sort));
haftmann@32354
   562
  in map2 (fn vs => Thm.certify_instantiate (vs ~~ vts, [])) vss thms end;
haftmann@31962
   563
haftmann@31962
   564
fun these_eqns thy c =
haftmann@31962
   565
  get_eqns thy c
haftmann@31962
   566
  |> (map o apfst) (Thm.transfer thy)
haftmann@32354
   567
  |> burrow_fst (same_typscheme thy);
haftmann@31962
   568
haftmann@31962
   569
fun all_eqns thy =
haftmann@31962
   570
  Symtab.dest ((the_eqns o the_exec) thy)
haftmann@31962
   571
  |> maps (Lazy.force o snd o snd o fst o snd);
haftmann@31962
   572
haftmann@31962
   573
haftmann@31962
   574
(* cases *)
haftmann@31156
   575
haftmann@31156
   576
fun case_certificate thm =
haftmann@31156
   577
  let
haftmann@31156
   578
    val ((head, raw_case_expr), cases) = (apfst Logic.dest_equals
haftmann@31156
   579
      o apsnd Logic.dest_conjunctions o Logic.dest_implies o Thm.prop_of) thm;
haftmann@31156
   580
    val _ = case head of Free _ => true
haftmann@31156
   581
      | Var _ => true
haftmann@31156
   582
      | _ => raise TERM ("case_cert", []);
haftmann@31156
   583
    val ([(case_var, _)], case_expr) = Term.strip_abs_eta 1 raw_case_expr;
haftmann@31156
   584
    val (Const (case_const, _), raw_params) = strip_comb case_expr;
haftmann@31156
   585
    val n = find_index (fn Free (v, _) => v = case_var | _ => false) raw_params;
haftmann@31156
   586
    val _ = if n = ~1 then raise TERM ("case_cert", []) else ();
haftmann@31156
   587
    val params = map (fst o dest_Var) (nth_drop n raw_params);
haftmann@31156
   588
    fun dest_case t =
haftmann@31156
   589
      let
haftmann@31156
   590
        val (head' $ t_co, rhs) = Logic.dest_equals t;
haftmann@31156
   591
        val _ = if head' = head then () else raise TERM ("case_cert", []);
haftmann@31156
   592
        val (Const (co, _), args) = strip_comb t_co;
haftmann@31156
   593
        val (Var (param, _), args') = strip_comb rhs;
haftmann@31156
   594
        val _ = if args' = args then () else raise TERM ("case_cert", []);
haftmann@31156
   595
      in (param, co) end;
haftmann@31156
   596
    fun analyze_cases cases =
haftmann@31156
   597
      let
haftmann@31156
   598
        val co_list = fold (AList.update (op =) o dest_case) cases [];
haftmann@31156
   599
      in map (the o AList.lookup (op =) co_list) params end;
haftmann@31156
   600
    fun analyze_let t =
haftmann@31156
   601
      let
haftmann@31156
   602
        val (head' $ arg, Var (param', _) $ arg') = Logic.dest_equals t;
haftmann@31156
   603
        val _ = if head' = head then () else raise TERM ("case_cert", []);
haftmann@31156
   604
        val _ = if arg' = arg then () else raise TERM ("case_cert", []);
haftmann@31156
   605
        val _ = if [param'] = params then () else raise TERM ("case_cert", []);
haftmann@31156
   606
      in [] end;
haftmann@31156
   607
    fun analyze (cases as [let_case]) =
haftmann@31156
   608
          (analyze_cases cases handle Bind => analyze_let let_case)
haftmann@31156
   609
      | analyze cases = analyze_cases cases;
haftmann@31156
   610
  in (case_const, (n, analyze cases)) end;
haftmann@31156
   611
haftmann@31156
   612
fun case_cert thm = case_certificate thm
haftmann@31156
   613
  handle Bind => error "bad case certificate"
haftmann@31156
   614
       | TERM _ => error "bad case certificate";
haftmann@31156
   615
haftmann@31962
   616
fun get_case_scheme thy = Symtab.lookup ((fst o the_cases o the_exec) thy);
haftmann@24219
   617
haftmann@31962
   618
val undefineds = Symtab.keys o snd o the_cases o the_exec;
haftmann@24219
   619
haftmann@24219
   620
haftmann@31962
   621
(* diagnostic *)
haftmann@24219
   622
haftmann@24219
   623
fun print_codesetup thy =
haftmann@24219
   624
  let
haftmann@24219
   625
    val ctxt = ProofContext.init thy;
haftmann@24844
   626
    val exec = the_exec thy;
haftmann@28368
   627
    fun pretty_eqn (s, (_, lthms)) =
haftmann@24219
   628
      (Pretty.block o Pretty.fbreaks) (
haftmann@28143
   629
        Pretty.str s :: pretty_lthms ctxt lthms
haftmann@24219
   630
      );
haftmann@24219
   631
    fun pretty_dtyp (s, []) =
haftmann@24219
   632
          Pretty.str s
haftmann@24219
   633
      | pretty_dtyp (s, cos) =
haftmann@24219
   634
          (Pretty.block o Pretty.breaks) (
haftmann@24219
   635
            Pretty.str s
haftmann@24219
   636
            :: Pretty.str "="
haftmann@31156
   637
            :: separate (Pretty.str "|") (map (fn (c, []) => Pretty.str (string_of_const thy c)
haftmann@24219
   638
                 | (c, tys) =>
haftmann@24219
   639
                     (Pretty.block o Pretty.breaks)
haftmann@31156
   640
                        (Pretty.str (string_of_const thy c)
wenzelm@26947
   641
                          :: Pretty.str "of"
wenzelm@26947
   642
                          :: map (Pretty.quote o Syntax.pretty_typ_global thy) tys)) cos)
haftmann@24219
   643
          );
haftmann@28368
   644
    val eqns = the_eqns exec
haftmann@24423
   645
      |> Symtab.dest
haftmann@31156
   646
      |> (map o apfst) (string_of_const thy)
haftmann@28695
   647
      |> (map o apsnd) (snd o fst)
haftmann@24219
   648
      |> sort (string_ord o pairself fst);
haftmann@24219
   649
    val dtyps = the_dtyps exec
haftmann@24219
   650
      |> Symtab.dest
haftmann@28695
   651
      |> map (fn (dtco, (_, (vs, cos)) :: _) =>
haftmann@31957
   652
          (string_of_typ thy (Type (dtco, map TFree vs)), cos))
haftmann@24219
   653
      |> sort (string_ord o pairself fst)
haftmann@24219
   654
  in
haftmann@24219
   655
    (Pretty.writeln o Pretty.chunks) [
haftmann@24219
   656
      Pretty.block (
haftmann@30023
   657
        Pretty.str "code equations:"
haftmann@24219
   658
        :: Pretty.fbrk
haftmann@28368
   659
        :: (Pretty.fbreaks o map pretty_eqn) eqns
haftmann@24219
   660
      ),
haftmann@25968
   661
      Pretty.block (
haftmann@24219
   662
        Pretty.str "datatypes:"
haftmann@24219
   663
        :: Pretty.fbrk
haftmann@24219
   664
        :: (Pretty.fbreaks o map pretty_dtyp) dtyps
haftmann@24219
   665
      )
haftmann@24219
   666
    ]
haftmann@24219
   667
  end;
haftmann@24219
   668
haftmann@24219
   669
haftmann@31962
   670
(** declaring executable ingredients **)
haftmann@31962
   671
haftmann@31962
   672
(* constant aliasses *)
haftmann@24219
   673
haftmann@31962
   674
fun add_const_alias thm thy =
haftmann@31962
   675
  let
haftmann@31962
   676
    val (ofclass, eqn) = case try Logic.dest_equals (Thm.prop_of thm)
haftmann@31962
   677
     of SOME ofclass_eq => ofclass_eq
wenzelm@32091
   678
      | _ => error ("Bad certificate: " ^ Display.string_of_thm_global thy thm);
haftmann@31962
   679
    val (T, class) = case try Logic.dest_of_class ofclass
haftmann@31962
   680
     of SOME T_class => T_class
wenzelm@32091
   681
      | _ => error ("Bad certificate: " ^ Display.string_of_thm_global thy thm);
haftmann@31962
   682
    val tvar = case try Term.dest_TVar T
haftmann@32122
   683
     of SOME (tvar as (_, sort)) => if null (filter (can (AxClass.get_info thy)) sort)
haftmann@32122
   684
          then tvar
wenzelm@32131
   685
          else error ("Bad sort: " ^ Display.string_of_thm_global thy thm)
wenzelm@32091
   686
      | _ => error ("Bad type: " ^ Display.string_of_thm_global thy thm);
haftmann@31962
   687
    val _ = if Term.add_tvars eqn [] = [tvar] then ()
wenzelm@32091
   688
      else error ("Inconsistent type: " ^ Display.string_of_thm_global thy thm);
haftmann@31962
   689
    val lhs_rhs = case try Logic.dest_equals eqn
haftmann@31962
   690
     of SOME lhs_rhs => lhs_rhs
haftmann@31962
   691
      | _ => error ("Not an equation: " ^ Syntax.string_of_term_global thy eqn);
haftmann@31962
   692
    val c_c' = case try (pairself (check_const thy)) lhs_rhs
haftmann@31962
   693
     of SOME c_c' => c_c'
haftmann@31962
   694
      | _ => error ("Not an equation with two constants: "
haftmann@31962
   695
          ^ Syntax.string_of_term_global thy eqn);
haftmann@31962
   696
    val _ = if the_list (AxClass.class_of_param thy (snd c_c')) = [class] then ()
wenzelm@32091
   697
      else error ("Inconsistent class: " ^ Display.string_of_thm_global thy thm);
haftmann@31962
   698
  in thy |>
haftmann@31962
   699
    (map_exec_purge NONE o map_aliasses) (fn (alias, classes) =>
haftmann@31962
   700
      ((c_c', thm) :: alias, insert (op =) class classes))
haftmann@31962
   701
  end;
haftmann@24219
   702
haftmann@24219
   703
haftmann@31962
   704
(* datatypes *)
haftmann@31090
   705
haftmann@31962
   706
structure Type_Interpretation = InterpretationFun(type T = string * serial val eq = eq_snd (op =) : T * T -> bool);
haftmann@25462
   707
haftmann@24423
   708
fun add_datatype raw_cs thy =
haftmann@24219
   709
  let
haftmann@25597
   710
    val cs = map (fn c_ty as (_, ty) => (AxClass.unoverload_const thy c_ty, ty)) raw_cs;
haftmann@31156
   711
    val (tyco, vs_cos) = constrset_of_consts thy cs;
haftmann@30076
   712
    val old_cs = (map fst o snd o get_datatype thy) tyco;
haftmann@30076
   713
    fun drop_outdated_cases cases = fold Symtab.delete_safe
haftmann@30076
   714
      (Symtab.fold (fn (c, (_, (_, cos))) =>
haftmann@30076
   715
        if exists (member (op =) old_cs) cos
haftmann@30076
   716
          then insert (op =) c else I) cases []) cases;
haftmann@24219
   717
  in
haftmann@24219
   718
    thy
haftmann@31091
   719
    |> fold (del_eqns o fst) cs
haftmann@28703
   720
    |> map_exec_purge NONE
haftmann@28695
   721
        ((map_dtyps o Symtab.map_default (tyco, [])) (cons (serial (), vs_cos))
haftmann@30076
   722
        #> (map_cases o apfst) drop_outdated_cases)
haftmann@31962
   723
    |> Type_Interpretation.data (tyco, serial ())
haftmann@24219
   724
  end;
haftmann@24219
   725
haftmann@31962
   726
fun type_interpretation f =  Type_Interpretation.interpretation
haftmann@25485
   727
  (fn (tyco, _) => fn thy => f (tyco, get_datatype thy tyco) thy);
haftmann@25485
   728
haftmann@24423
   729
fun add_datatype_cmd raw_cs thy =
haftmann@24423
   730
  let
haftmann@31156
   731
    val cs = map (read_bare_const thy) raw_cs;
haftmann@24423
   732
  in add_datatype cs thy end;
haftmann@24219
   733
haftmann@31962
   734
haftmann@31962
   735
(* code equations *)
haftmann@31962
   736
haftmann@31962
   737
fun gen_add_eqn default (eqn as (thm, _)) thy =
haftmann@31962
   738
  let val c = const_eqn thy thm
haftmann@31962
   739
  in change_eqns false c (add_thm thy default eqn) thy end;
haftmann@31962
   740
haftmann@31962
   741
fun add_eqn thm thy =
haftmann@31962
   742
  gen_add_eqn false (mk_eqn thy (thm, true)) thy;
haftmann@31962
   743
haftmann@31962
   744
fun add_warning_eqn thm thy =
haftmann@31962
   745
  case mk_eqn_warning thy thm
haftmann@31962
   746
   of SOME eqn => gen_add_eqn false eqn thy
haftmann@31962
   747
    | NONE => thy;
haftmann@31962
   748
haftmann@31962
   749
fun add_default_eqn thm thy =
haftmann@31962
   750
  case mk_eqn_liberal thy thm
haftmann@31962
   751
   of SOME eqn => gen_add_eqn true eqn thy
haftmann@31962
   752
    | NONE => thy;
haftmann@31962
   753
haftmann@31962
   754
fun add_nbe_eqn thm thy =
haftmann@31962
   755
  gen_add_eqn false (mk_eqn thy (thm, false)) thy;
haftmann@31962
   756
haftmann@31962
   757
fun add_eqnl (c, lthms) thy =
haftmann@31962
   758
  let
haftmann@31962
   759
    val lthms' = certificate thy (fn thy => assert_eqns_const thy c) lthms;
haftmann@31962
   760
  in change_eqns false c (add_lthms lthms') thy end;
haftmann@31962
   761
haftmann@31962
   762
val add_default_eqn_attribute = Thm.declaration_attribute
haftmann@31962
   763
  (fn thm => Context.mapping (add_default_eqn thm) I);
haftmann@31962
   764
val add_default_eqn_attrib = Attrib.internal (K add_default_eqn_attribute);
haftmann@31962
   765
haftmann@31962
   766
fun del_eqn thm thy = case mk_eqn_liberal thy thm
haftmann@31962
   767
 of SOME (thm, _) => change_eqns true (const_eqn thy thm) (del_thm thm) thy
haftmann@31962
   768
  | NONE => thy;
haftmann@31962
   769
haftmann@32070
   770
(* c.f. src/HOL/Tools/recfun_codegen.ML *)
haftmann@32070
   771
haftmann@32070
   772
structure Code_Target_Attr = TheoryDataFun (
haftmann@31998
   773
  type T = (string -> thm -> theory -> theory) option;
haftmann@31998
   774
  val empty = NONE;
haftmann@31998
   775
  val copy = I;
haftmann@31998
   776
  val extend = I;
haftmann@31998
   777
  fun merge _ (NONE, f2) = f2
haftmann@31998
   778
    | merge _ (f1, _) = f1;
haftmann@31998
   779
);
haftmann@31998
   780
haftmann@32070
   781
fun set_code_target_attr f = Code_Target_Attr.map (K (SOME f));
haftmann@32070
   782
haftmann@32070
   783
fun code_target_attr prefix thm thy =
haftmann@32070
   784
  let
haftmann@32070
   785
    val attr = the_default ((K o K) I) (Code_Target_Attr.get thy);
haftmann@32070
   786
  in thy |> add_warning_eqn thm |> attr prefix thm end;
haftmann@32070
   787
haftmann@32070
   788
(* setup *)
haftmann@31998
   789
haftmann@31962
   790
val _ = Context.>> (Context.map_theory
haftmann@31962
   791
  (let
haftmann@31962
   792
    fun mk_attribute f = Thm.declaration_attribute (fn thm => Context.mapping (f thm) I);
haftmann@31998
   793
    val code_attribute_parser =
haftmann@31998
   794
      Args.del |-- Scan.succeed (mk_attribute del_eqn)
haftmann@31998
   795
      || Args.$$$ "nbe" |-- Scan.succeed (mk_attribute add_nbe_eqn)
haftmann@31998
   796
      || (Args.$$$ "target" |-- Args.colon |-- Args.name >>
haftmann@32070
   797
           (mk_attribute o code_target_attr))
haftmann@31998
   798
      || Scan.succeed (mk_attribute add_warning_eqn);
haftmann@31962
   799
  in
haftmann@31962
   800
    Type_Interpretation.init
haftmann@31998
   801
    #> Attrib.setup (Binding.name "code") (Scan.lift code_attribute_parser)
haftmann@31998
   802
        "declare theorems for code generation"
haftmann@31962
   803
  end));
haftmann@31962
   804
haftmann@31962
   805
haftmann@31962
   806
(* cases *)
haftmann@31962
   807
haftmann@24844
   808
fun add_case thm thy =
haftmann@24844
   809
  let
haftmann@31156
   810
    val (c, (k, case_pats)) = case_cert thm;
haftmann@31088
   811
    val _ = case filter_out (is_constr thy) case_pats
haftmann@30076
   812
     of [] => ()
haftmann@30076
   813
      | cs => error ("Non-constructor(s) in case certificate: " ^ commas (map quote cs));
haftmann@30076
   814
    val entry = (1 + Int.max (1, length case_pats), (k, case_pats))
haftmann@30076
   815
  in (map_exec_purge (SOME [c]) o map_cases o apfst) (Symtab.update (c, entry)) thy end;
haftmann@24844
   816
haftmann@24844
   817
fun add_undefined c thy =
haftmann@24844
   818
  (map_exec_purge (SOME [c]) o map_cases o apsnd) (Symtab.update (c, ())) thy;
haftmann@24844
   819
haftmann@24219
   820
end; (*struct*)
haftmann@24219
   821
haftmann@24219
   822
haftmann@31962
   823
(** type-safe interfaces for data depedent on executable code **)
haftmann@24219
   824
haftmann@31962
   825
functor Code_Data_Fun(Data: CODE_DATA_ARGS): CODE_DATA =
haftmann@24219
   826
struct
haftmann@24219
   827
haftmann@24219
   828
type T = Data.T;
haftmann@24219
   829
exception Data of T;
haftmann@24219
   830
fun dest (Data x) = x
haftmann@24219
   831
haftmann@24219
   832
val kind = Code.declare_data (Data Data.empty)
haftmann@27609
   833
  (fn thy => fn cs => fn Data x => Data (Data.purge thy cs x));
haftmann@24219
   834
haftmann@24219
   835
val data_op = (kind, Data, dest);
haftmann@24219
   836
haftmann@24219
   837
val get = Code.get_data data_op;
haftmann@24219
   838
val change = Code.change_data data_op;
haftmann@24219
   839
fun change_yield thy = Code.change_yield_data data_op thy;
haftmann@24219
   840
haftmann@24219
   841
end;
haftmann@24219
   842
haftmann@28143
   843
structure Code : CODE = struct open Code; end;