src/Pure/Isar/code.ML
author haftmann
Tue Jan 05 14:19:12 2010 +0100 (2010-01-05 ago)
changeset 34272 95df5e6dd41c
parent 34251 cd642bb91f64
child 34874 89c230bf8feb
permissions -rw-r--r--
avoid exporting Type.build_tsig
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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 * typ list) list)
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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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  val typscheme_eqns: theory -> string -> thm list -> (string * sort) list * typ
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  val standard_typscheme: theory -> thm list -> thm 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 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_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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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 -> (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 -> serial
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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_CRITICAL 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 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_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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(** data store **)
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(* code equations *)
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type eqns = bool * (thm * bool) list;
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  (*default flag, theorems with proper flag *)
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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 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, add_drop_redundant thy thm thms)
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  | add_thm thy true thm (true, thms) = (true, thms @ [thm])
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  | add_thm thy false thm (true, thms) = (false, [thm]);
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fun del_thm thm = apsnd (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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  signatures: int Symtab.table * typ Symtab.table,
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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, ((signatures, eqns), (dtyps, cases))) =
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  Spec { history_concluded = history_concluded,
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    signatures = signatures, eqns = eqns, dtyps = dtyps, cases = cases };
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fun map_spec f (Spec { history_concluded = history_concluded, signatures = signatures,
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  eqns = eqns, dtyps = dtyps, cases = cases }) =
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  make_spec (f (history_concluded, ((signatures, eqns), (dtyps, cases))));
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fun merge_spec (Spec { history_concluded = _, signatures = (tycos1, sigs1), eqns = eqns1,
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    dtyps = dtyps1, cases = (cases1, undefs1) },
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  Spec { history_concluded = _, signatures = (tycos2, sigs2), eqns = eqns2,
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    dtyps = dtyps2, 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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    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, ((signatures, eqns), (dtyps, 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_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;
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val map_signatures = map_spec o apsnd o apfst o apfst;
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val map_eqns = map_spec o apsnd o apfst o apsnd;
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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 = { 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 => sys_error "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
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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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val purge_data = (Code_Data.map o apsnd) (fn _ => empty_dataref ());
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fun change_eqns delete c f = (map_exec_purge o map_eqns
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  o (if delete then Symtab.map_entry c else Symtab.map_default (c, ((false, (true, [])), [])))
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    o apfst) (fn (_, eqns) => (true, f eqns));
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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_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))
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        #> map_history_concluded (K true))
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    |> SOME;
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val _ = Context.>> (Context.map_theory (Theory.at_begin continue_history #> Theory.at_end conclude_history));
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(* access to data dependent on abstract executable code *)
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fun change_yield_data (kind, mk, dest) theory f =
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  let
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    val dataref = (snd o Code_Data.get) theory;
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    val (datatab, thy_ref) = case Synchronized.value dataref
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     of SOME (datatab, thy_ref) => if Theory.eq_thy (theory, Theory.deref thy_ref)
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          then (datatab, thy_ref)
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          else (Datatab.empty, Theory.check_thy theory)
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      | NONE => (Datatab.empty, Theory.check_thy theory)
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    val data = case Datatab.lookup datatab kind
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     of SOME data => data
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      | NONE => invoke_init kind;
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    val result as (x, data') = f (dest data);
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    val _ = Synchronized.change dataref
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      ((K o SOME) (Datatab.update (kind, mk data') datatab, thy_ref));
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  in result end;
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fun change_data ops theory f = change_yield_data ops theory (f #> pair ()) |> snd;
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end; (*local*)
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(** foundation **)
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(* constants *)
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fun arity_number thy tyco = case Symtab.lookup ((fst o the_signatures o the_exec) thy) tyco
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 of SOME n => n
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  | NONE => Sign.arity_number thy tyco;
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fun build_tsig thy =
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  let
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    val (tycos, _) = (the_signatures o the_exec) thy;
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    val decls = (#types o Type.rep_tsig o Sign.tsig_of) thy
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      |> snd 
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      |> Symtab.fold (fn (tyco, n) =>
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          Symtab.update (tyco, Type.LogicalType n)) tycos;
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  in
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    Type.empty_tsig
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    |> Symtab.fold (fn (tyco, Type.LogicalType n) => Type.add_type Name_Space.default_naming
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        (Binding.qualified_name tyco, n) | _ => I) decls
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  end;
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fun cert_signature thy = Logic.varifyT o Type.cert_typ (build_tsig thy) o Type.no_tvars;
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haftmann@33940
   331
fun read_signature thy = cert_signature thy o Type.strip_sorts
haftmann@33940
   332
  o Syntax.parse_typ (ProofContext.init thy);
haftmann@33940
   333
haftmann@33940
   334
fun expand_signature thy = Type.cert_typ_mode Type.mode_syntax (Sign.tsig_of thy);
haftmann@33940
   335
haftmann@33940
   336
fun lookup_typ thy = Symtab.lookup ((snd o the_signatures o the_exec) thy);
haftmann@33940
   337
haftmann@33940
   338
fun const_typ thy c = case lookup_typ thy c
haftmann@33940
   339
 of SOME ty => ty
haftmann@33940
   340
  | NONE => (Type.strip_sorts o Sign.the_const_type thy) c;
haftmann@33940
   341
haftmann@33940
   342
fun subst_signature thy c ty =
haftmann@33940
   343
  let
haftmann@33940
   344
    fun mk_subst (Type (tyco, tys1)) (ty2 as Type (tyco2, tys2)) =
haftmann@33940
   345
          fold2 mk_subst tys1 tys2
haftmann@33940
   346
      | mk_subst ty (TVar (v, sort)) = Vartab.update (v, ([], ty))
haftmann@33940
   347
  in case lookup_typ thy c
haftmann@33940
   348
   of SOME ty' => Envir.subst_type (mk_subst ty (expand_signature thy ty') Vartab.empty) ty'
haftmann@33940
   349
    | NONE => ty
haftmann@33940
   350
  end;
haftmann@33940
   351
haftmann@33940
   352
fun subst_signatures thy = map_aterms (fn Const (c, ty) => Const (c, subst_signature thy c ty) | t => t);
haftmann@33940
   353
haftmann@33940
   354
fun args_number thy = length o fst o strip_type o const_typ thy;
haftmann@31962
   355
haftmann@31962
   356
haftmann@31962
   357
(* datatypes *)
haftmann@31156
   358
haftmann@31156
   359
fun constrset_of_consts thy cs =
haftmann@31156
   360
  let
haftmann@31156
   361
    val _ = map (fn (c, _) => if (is_some o AxClass.class_of_param thy) c
haftmann@31156
   362
      then error ("Is a class parameter: " ^ string_of_const thy c) else ()) cs;
haftmann@33531
   363
    fun no_constr s (c, ty) = error ("Not a datatype constructor:\n" ^ string_of_const thy c
haftmann@33531
   364
      ^ " :: " ^ string_of_typ thy ty ^ "\n" ^ enclose "(" ")" s);
haftmann@31156
   365
    fun last_typ c_ty ty =
haftmann@31156
   366
      let
haftmann@33531
   367
        val tfrees = Term.add_tfreesT ty [];
haftmann@31156
   368
        val (tyco, vs) = ((apsnd o map) (dest_TFree) o dest_Type o snd o strip_type) ty
haftmann@33531
   369
          handle TYPE _ => no_constr "bad type" c_ty
haftmann@33531
   370
        val _ = if has_duplicates (eq_fst (op =)) vs
haftmann@33531
   371
          then no_constr "duplicate type variables in datatype" c_ty else ();
haftmann@33531
   372
        val _ = if length tfrees <> length vs
haftmann@33531
   373
          then no_constr "type variables missing in datatype" c_ty else ();
haftmann@31156
   374
      in (tyco, vs) end;
haftmann@33940
   375
    fun ty_sorts (c, raw_ty) =
haftmann@31156
   376
      let
haftmann@33940
   377
        val ty = subst_signature thy c raw_ty;
haftmann@33940
   378
        val ty_decl = (Logic.unvarifyT o const_typ thy) c;
haftmann@31156
   379
        val (tyco, _) = last_typ (c, ty) ty_decl;
haftmann@31156
   380
        val (_, vs) = last_typ (c, ty) ty;
haftmann@31156
   381
      in ((tyco, map snd vs), (c, (map fst vs, ty))) end;
haftmann@31156
   382
    fun add ((tyco', sorts'), c) ((tyco, sorts), cs) =
haftmann@31156
   383
      let
haftmann@31998
   384
        val _ = if (tyco' : string) <> tyco
haftmann@31156
   385
          then error "Different type constructors in constructor set"
haftmann@31156
   386
          else ();
haftmann@31156
   387
        val sorts'' = map2 (curry (Sorts.inter_sort (Sign.classes_of thy))) sorts' sorts
haftmann@31156
   388
      in ((tyco, sorts), c :: cs) end;
haftmann@31156
   389
    fun inst vs' (c, (vs, ty)) =
haftmann@31156
   390
      let
haftmann@31156
   391
        val the_v = the o AList.lookup (op =) (vs ~~ vs');
haftmann@31156
   392
        val ty' = map_atyps (fn TFree (v, _) => TFree (the_v v)) ty;
haftmann@31156
   393
      in (c, (fst o strip_type) ty') end;
haftmann@31156
   394
    val c' :: cs' = map ty_sorts cs;
haftmann@31156
   395
    val ((tyco, sorts), cs'') = fold add cs' (apsnd single c');
haftmann@31156
   396
    val vs = Name.names Name.context Name.aT sorts;
haftmann@31156
   397
    val cs''' = map (inst vs) cs'';
haftmann@31156
   398
  in (tyco, (vs, rev cs''')) end;
haftmann@31156
   399
haftmann@31962
   400
fun get_datatype thy tyco =
haftmann@31962
   401
  case these (Symtab.lookup ((the_dtyps o the_exec) thy) tyco)
haftmann@31962
   402
   of (_, spec) :: _ => spec
haftmann@33940
   403
    | [] => arity_number thy tyco
haftmann@31962
   404
        |> Name.invents Name.context Name.aT
haftmann@31962
   405
        |> map (rpair [])
haftmann@31962
   406
        |> rpair [];
haftmann@31962
   407
haftmann@31962
   408
fun get_datatype_of_constr thy c =
haftmann@33940
   409
  case (snd o strip_type o const_typ thy) c
haftmann@31962
   410
   of Type (tyco, _) => if member (op =) ((map fst o snd o get_datatype thy) tyco) c
haftmann@31962
   411
       then SOME tyco else NONE
haftmann@31962
   412
    | _ => NONE;
haftmann@31962
   413
haftmann@31962
   414
fun is_constr thy = is_some o get_datatype_of_constr thy;
haftmann@31962
   415
haftmann@31156
   416
haftmann@31156
   417
(* code equations *)
haftmann@31156
   418
haftmann@31156
   419
exception BAD_THM of string;
haftmann@31156
   420
fun bad_thm msg = raise BAD_THM msg;
haftmann@31156
   421
fun error_thm f thm = f thm handle BAD_THM msg => error msg;
haftmann@31642
   422
fun warning_thm f thm = SOME (f thm) handle BAD_THM msg => (warning msg; NONE)
haftmann@31156
   423
fun try_thm f thm = SOME (f thm) handle BAD_THM _ => NONE;
haftmann@31156
   424
haftmann@31156
   425
fun is_linear thm =
haftmann@31156
   426
  let val (_, args) = (strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of) thm
haftmann@31156
   427
  in not (has_duplicates (op =) ((fold o fold_aterms)
haftmann@31156
   428
    (fn Var (v, _) => cons v | _ => I) args [])) end;
haftmann@31156
   429
haftmann@31962
   430
fun gen_assert_eqn thy is_constr_pat (thm, proper) =
haftmann@31156
   431
  let
haftmann@31156
   432
    val (lhs, rhs) = (Logic.dest_equals o Thm.plain_prop_of) thm
wenzelm@32091
   433
      handle TERM _ => bad_thm ("Not an equation: " ^ Display.string_of_thm_global thy thm)
wenzelm@32091
   434
           | THM _ => bad_thm ("Not an equation: " ^ Display.string_of_thm_global thy thm);
haftmann@31156
   435
    fun vars_of t = fold_aterms (fn Var (v, _) => insert (op =) v
haftmann@31156
   436
      | Free _ => bad_thm ("Illegal free variable in equation\n"
wenzelm@32091
   437
          ^ Display.string_of_thm_global thy thm)
haftmann@31156
   438
      | _ => I) t [];
haftmann@31156
   439
    fun tvars_of t = fold_term_types (fn _ =>
haftmann@31156
   440
      fold_atyps (fn TVar (v, _) => insert (op =) v
haftmann@31156
   441
        | TFree _ => bad_thm 
wenzelm@32091
   442
      ("Illegal free type variable in equation\n" ^ Display.string_of_thm_global thy thm))) t [];
haftmann@31156
   443
    val lhs_vs = vars_of lhs;
haftmann@31156
   444
    val rhs_vs = vars_of rhs;
haftmann@31156
   445
    val lhs_tvs = tvars_of lhs;
haftmann@31156
   446
    val rhs_tvs = tvars_of rhs;
haftmann@31156
   447
    val _ = if null (subtract (op =) lhs_vs rhs_vs)
haftmann@31156
   448
      then ()
haftmann@31156
   449
      else bad_thm ("Free variables on right hand side of equation\n"
wenzelm@32091
   450
        ^ Display.string_of_thm_global thy thm);
haftmann@31156
   451
    val _ = if null (subtract (op =) lhs_tvs rhs_tvs)
haftmann@31156
   452
      then ()
haftmann@31156
   453
      else bad_thm ("Free type variables on right hand side of equation\n"
wenzelm@32091
   454
        ^ Display.string_of_thm_global thy thm)
wenzelm@32091
   455
    val (head, args) = (strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of) thm;
haftmann@31156
   456
    val (c, ty) = case head
haftmann@31156
   457
     of Const (c_ty as (_, ty)) => (AxClass.unoverload_const thy c_ty, ty)
wenzelm@32091
   458
      | _ => bad_thm ("Equation not headed by constant\n" ^ Display.string_of_thm_global thy thm);
haftmann@31156
   459
    fun check _ (Abs _) = bad_thm
haftmann@31156
   460
          ("Abstraction on left hand side of equation\n"
wenzelm@32091
   461
            ^ Display.string_of_thm_global thy thm)
haftmann@31156
   462
      | check 0 (Var _) = ()
haftmann@31156
   463
      | check _ (Var _) = bad_thm
haftmann@31156
   464
          ("Variable with application on left hand side of equation\n"
wenzelm@32091
   465
            ^ Display.string_of_thm_global thy thm)
haftmann@31156
   466
      | check n (t1 $ t2) = (check (n+1) t1; check 0 t2)
haftmann@33940
   467
      | check n (Const (c_ty as (_, ty))) =
haftmann@33940
   468
          let
haftmann@33940
   469
            val c' = AxClass.unoverload_const thy c_ty
haftmann@33940
   470
          in if n = (length o fst o strip_type o subst_signature thy c') ty
haftmann@33940
   471
            then if not proper orelse is_constr_pat c'
haftmann@33940
   472
              then ()
haftmann@33940
   473
              else bad_thm (quote c ^ " is not a constructor, on left hand side of equation\n"
haftmann@33940
   474
                ^ Display.string_of_thm_global thy thm)
haftmann@33940
   475
            else bad_thm
haftmann@33940
   476
              ("Partially applied constant " ^ quote c ^ " on left hand side of equation\n"
haftmann@33940
   477
                 ^ Display.string_of_thm_global thy thm)
haftmann@33940
   478
          end;
haftmann@31156
   479
    val _ = map (check 0) args;
haftmann@31156
   480
    val _ = if not proper orelse is_linear thm then ()
haftmann@31156
   481
      else bad_thm ("Duplicate variables on left hand side of equation\n"
wenzelm@32091
   482
        ^ Display.string_of_thm_global thy thm);
haftmann@31156
   483
    val _ = if (is_none o AxClass.class_of_param thy) c
haftmann@31156
   484
      then ()
haftmann@33940
   485
      else bad_thm ("Overloaded constant as head in equation\n"
wenzelm@32091
   486
        ^ Display.string_of_thm_global thy thm)
haftmann@31962
   487
    val _ = if not (is_constr thy c)
haftmann@31156
   488
      then ()
haftmann@31156
   489
      else bad_thm ("Constructor as head in equation\n"
wenzelm@32091
   490
        ^ Display.string_of_thm_global thy thm)
haftmann@31156
   491
    val ty_decl = Sign.the_const_type thy c;
haftmann@31156
   492
    val _ = if Sign.typ_equiv thy (Type.strip_sorts ty_decl, Type.strip_sorts ty)
haftmann@31156
   493
      then () else bad_thm ("Type\n" ^ string_of_typ thy ty
haftmann@31156
   494
           ^ "\nof equation\n"
wenzelm@32091
   495
           ^ Display.string_of_thm_global thy thm
haftmann@31156
   496
           ^ "\nis incompatible with declared function type\n"
haftmann@31156
   497
           ^ string_of_typ thy ty_decl)
haftmann@31156
   498
  in (thm, proper) end;
haftmann@31156
   499
haftmann@31962
   500
fun assert_eqn thy = error_thm (gen_assert_eqn thy (is_constr thy));
haftmann@31962
   501
haftmann@31962
   502
fun meta_rewrite thy = LocalDefs.meta_rewrite_rule (ProofContext.init thy);
haftmann@31156
   503
haftmann@31962
   504
fun mk_eqn thy = error_thm (gen_assert_eqn thy (K true)) o
haftmann@31962
   505
  apfst (meta_rewrite thy);
haftmann@31962
   506
haftmann@31962
   507
fun mk_eqn_warning thy = Option.map (fn (thm, _) => (thm, is_linear thm))
haftmann@31962
   508
  o warning_thm (gen_assert_eqn thy (K true)) o rpair false o meta_rewrite thy;
haftmann@31962
   509
haftmann@31962
   510
fun mk_eqn_liberal thy = Option.map (fn (thm, _) => (thm, is_linear thm))
haftmann@31962
   511
  o try_thm (gen_assert_eqn thy (K true)) o rpair false o meta_rewrite thy;
haftmann@31156
   512
haftmann@33940
   513
val head_eqn = dest_Const o fst o strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of;
haftmann@31156
   514
haftmann@31957
   515
fun const_typ_eqn thy thm =
haftmann@31156
   516
  let
haftmann@32640
   517
    val (c, ty) = head_eqn thm;
haftmann@31156
   518
    val c' = AxClass.unoverload_const thy (c, ty);
haftmann@33940
   519
      (*permissive wrt. to overloaded constants!*)
haftmann@31156
   520
  in (c', ty) end;
haftmann@33940
   521
haftmann@31957
   522
fun const_eqn thy = fst o const_typ_eqn thy;
haftmann@31156
   523
haftmann@33940
   524
fun raw_typscheme thy (c, ty) =
haftmann@32873
   525
  (map dest_TFree (Sign.const_typargs thy (c, ty)), Type.strip_sorts ty);
haftmann@33940
   526
haftmann@33940
   527
fun typscheme thy (c, ty) = raw_typscheme thy (c, subst_signature thy c ty);
haftmann@33940
   528
haftmann@32873
   529
fun typscheme_eqn thy = typscheme thy o apsnd Logic.unvarifyT o const_typ_eqn thy;
haftmann@33940
   530
haftmann@32873
   531
fun typscheme_eqns thy c [] = 
haftmann@32873
   532
      let
haftmann@33940
   533
        val raw_ty = const_typ thy c;
haftmann@32873
   534
        val tvars = Term.add_tvar_namesT raw_ty [];
haftmann@32873
   535
        val tvars' = case AxClass.class_of_param thy c
haftmann@32873
   536
         of SOME class => [TFree (Name.aT, [class])]
haftmann@32873
   537
          | NONE => Name.invent_list [] Name.aT (length tvars)
haftmann@32873
   538
              |> map (fn v => TFree (v, []));
haftmann@32873
   539
        val ty = typ_subst_TVars (tvars ~~ tvars') raw_ty;
haftmann@33940
   540
      in raw_typscheme thy (c, ty) end
haftmann@33969
   541
  | typscheme_eqns thy c (thm :: _) = typscheme_eqn thy thm;
haftmann@32872
   542
haftmann@31962
   543
fun assert_eqns_const thy c eqns =
haftmann@31962
   544
  let
haftmann@31962
   545
    fun cert (eqn as (thm, _)) = if c = const_eqn thy thm
haftmann@31962
   546
      then eqn else error ("Wrong head of code equation,\nexpected constant "
wenzelm@32091
   547
        ^ string_of_const thy c ^ "\n" ^ Display.string_of_thm_global thy thm)
haftmann@31962
   548
  in map (cert o assert_eqn thy) eqns end;
haftmann@31156
   549
haftmann@32929
   550
fun standard_typscheme thy thms =
haftmann@32354
   551
  let
haftmann@32640
   552
    fun tvars_of T = rev (Term.add_tvarsT T []);
haftmann@32640
   553
    val vss = map (tvars_of o snd o head_eqn) thms;
haftmann@32354
   554
    fun inter_sorts vs =
haftmann@32354
   555
      fold (curry (Sorts.inter_sort (Sign.classes_of thy)) o snd) vs [];
haftmann@32354
   556
    val sorts = map_transpose inter_sorts vss;
haftmann@32873
   557
    val vts = Name.names Name.context Name.aT sorts
haftmann@32354
   558
      |> map (fn (v, sort) => TVar ((v, 0), sort));
haftmann@32354
   559
  in map2 (fn vs => Thm.certify_instantiate (vs ~~ vts, [])) vss thms end;
haftmann@31962
   560
haftmann@31962
   561
fun these_eqns thy c =
haftmann@34244
   562
  Symtab.lookup ((the_eqns o the_exec) thy) c
haftmann@34244
   563
  |> Option.map (snd o snd o fst)
haftmann@34244
   564
  |> these
haftmann@31962
   565
  |> (map o apfst) (Thm.transfer thy)
haftmann@32929
   566
  |> burrow_fst (standard_typscheme thy);
haftmann@31962
   567
haftmann@31962
   568
fun all_eqns thy =
haftmann@31962
   569
  Symtab.dest ((the_eqns o the_exec) thy)
haftmann@33006
   570
  |> maps (snd o snd o fst o snd);
haftmann@31962
   571
haftmann@31962
   572
haftmann@31962
   573
(* cases *)
haftmann@31156
   574
haftmann@31156
   575
fun case_certificate thm =
haftmann@31156
   576
  let
haftmann@31156
   577
    val ((head, raw_case_expr), cases) = (apfst Logic.dest_equals
haftmann@32640
   578
      o apsnd Logic.dest_conjunctions o Logic.dest_implies o Thm.plain_prop_of) thm;
haftmann@31156
   579
    val _ = case head of Free _ => true
haftmann@31156
   580
      | Var _ => true
haftmann@31156
   581
      | _ => raise TERM ("case_cert", []);
haftmann@31156
   582
    val ([(case_var, _)], case_expr) = Term.strip_abs_eta 1 raw_case_expr;
haftmann@31156
   583
    val (Const (case_const, _), raw_params) = strip_comb case_expr;
haftmann@31156
   584
    val n = find_index (fn Free (v, _) => v = case_var | _ => false) raw_params;
haftmann@31156
   585
    val _ = if n = ~1 then raise TERM ("case_cert", []) else ();
haftmann@31156
   586
    val params = map (fst o dest_Var) (nth_drop n raw_params);
haftmann@31156
   587
    fun dest_case t =
haftmann@31156
   588
      let
haftmann@31156
   589
        val (head' $ t_co, rhs) = Logic.dest_equals t;
haftmann@31156
   590
        val _ = if head' = head then () else raise TERM ("case_cert", []);
haftmann@31156
   591
        val (Const (co, _), args) = strip_comb t_co;
haftmann@31156
   592
        val (Var (param, _), args') = strip_comb rhs;
haftmann@31156
   593
        val _ = if args' = args then () else raise TERM ("case_cert", []);
haftmann@31156
   594
      in (param, co) end;
haftmann@31156
   595
    fun analyze_cases cases =
haftmann@31156
   596
      let
haftmann@31156
   597
        val co_list = fold (AList.update (op =) o dest_case) cases [];
haftmann@31156
   598
      in map (the o AList.lookup (op =) co_list) params end;
haftmann@31156
   599
    fun analyze_let t =
haftmann@31156
   600
      let
haftmann@31156
   601
        val (head' $ arg, Var (param', _) $ arg') = Logic.dest_equals t;
haftmann@31156
   602
        val _ = if head' = head then () else raise TERM ("case_cert", []);
haftmann@31156
   603
        val _ = if arg' = arg then () else raise TERM ("case_cert", []);
haftmann@31156
   604
        val _ = if [param'] = params then () else raise TERM ("case_cert", []);
haftmann@31156
   605
      in [] end;
haftmann@31156
   606
    fun analyze (cases as [let_case]) =
haftmann@31156
   607
          (analyze_cases cases handle Bind => analyze_let let_case)
haftmann@31156
   608
      | analyze cases = analyze_cases cases;
haftmann@31156
   609
  in (case_const, (n, analyze cases)) end;
haftmann@31156
   610
haftmann@31156
   611
fun case_cert thm = case_certificate thm
haftmann@31156
   612
  handle Bind => error "bad case certificate"
haftmann@31156
   613
       | TERM _ => error "bad case certificate";
haftmann@31156
   614
haftmann@31962
   615
fun get_case_scheme thy = Symtab.lookup ((fst o the_cases o the_exec) thy);
haftmann@24219
   616
haftmann@31962
   617
val undefineds = Symtab.keys o snd o the_cases o the_exec;
haftmann@24219
   618
haftmann@24219
   619
haftmann@31962
   620
(* diagnostic *)
haftmann@24219
   621
haftmann@24219
   622
fun print_codesetup thy =
haftmann@24219
   623
  let
haftmann@24219
   624
    val ctxt = ProofContext.init thy;
haftmann@24844
   625
    val exec = the_exec thy;
haftmann@33006
   626
    fun pretty_eqns (s, (_, eqns)) =
haftmann@24219
   627
      (Pretty.block o Pretty.fbreaks) (
haftmann@33006
   628
        Pretty.str s :: map (Display.pretty_thm ctxt o fst) eqns
haftmann@24219
   629
      );
haftmann@24219
   630
    fun pretty_dtyp (s, []) =
haftmann@24219
   631
          Pretty.str s
haftmann@24219
   632
      | pretty_dtyp (s, cos) =
haftmann@24219
   633
          (Pretty.block o Pretty.breaks) (
haftmann@24219
   634
            Pretty.str s
haftmann@24219
   635
            :: Pretty.str "="
haftmann@31156
   636
            :: separate (Pretty.str "|") (map (fn (c, []) => Pretty.str (string_of_const thy c)
haftmann@24219
   637
                 | (c, tys) =>
haftmann@24219
   638
                     (Pretty.block o Pretty.breaks)
haftmann@31156
   639
                        (Pretty.str (string_of_const thy c)
wenzelm@26947
   640
                          :: Pretty.str "of"
wenzelm@26947
   641
                          :: map (Pretty.quote o Syntax.pretty_typ_global thy) tys)) cos)
haftmann@24219
   642
          );
haftmann@28368
   643
    val eqns = the_eqns exec
haftmann@24423
   644
      |> Symtab.dest
haftmann@31156
   645
      |> (map o apfst) (string_of_const thy)
haftmann@28695
   646
      |> (map o apsnd) (snd o fst)
haftmann@24219
   647
      |> sort (string_ord o pairself fst);
haftmann@24219
   648
    val dtyps = the_dtyps exec
haftmann@24219
   649
      |> Symtab.dest
haftmann@28695
   650
      |> map (fn (dtco, (_, (vs, cos)) :: _) =>
haftmann@31957
   651
          (string_of_typ thy (Type (dtco, map TFree vs)), cos))
haftmann@24219
   652
      |> sort (string_ord o pairself fst)
haftmann@24219
   653
  in
haftmann@24219
   654
    (Pretty.writeln o Pretty.chunks) [
haftmann@24219
   655
      Pretty.block (
haftmann@30023
   656
        Pretty.str "code equations:"
haftmann@24219
   657
        :: Pretty.fbrk
haftmann@33006
   658
        :: (Pretty.fbreaks o map pretty_eqns) eqns
haftmann@24219
   659
      ),
haftmann@25968
   660
      Pretty.block (
haftmann@24219
   661
        Pretty.str "datatypes:"
haftmann@24219
   662
        :: Pretty.fbrk
haftmann@24219
   663
        :: (Pretty.fbreaks o map pretty_dtyp) dtyps
haftmann@24219
   664
      )
haftmann@24219
   665
    ]
haftmann@24219
   666
  end;
haftmann@24219
   667
haftmann@24219
   668
haftmann@31962
   669
(** declaring executable ingredients **)
haftmann@31962
   670
haftmann@33940
   671
(* constant signatures *)
haftmann@33940
   672
haftmann@33940
   673
fun add_type tyco thy =
haftmann@33940
   674
  case Symtab.lookup ((snd o #types o Type.rep_tsig o Sign.tsig_of) thy) tyco
haftmann@33940
   675
   of SOME (Type.Abbreviation (vs, _, _)) =>
haftmann@34173
   676
          (map_exec_purge o map_signatures o apfst)
haftmann@33940
   677
            (Symtab.update (tyco, length vs)) thy
haftmann@33940
   678
    | _ => error ("No such type abbreviation: " ^ quote tyco);
haftmann@33940
   679
haftmann@33940
   680
fun add_type_cmd s thy = add_type (Sign.intern_type thy s) thy;
haftmann@33940
   681
haftmann@33940
   682
fun gen_add_signature prep_const prep_signature (raw_c, raw_ty) thy =
haftmann@33940
   683
  let
haftmann@33940
   684
    val c = prep_const thy raw_c;
haftmann@33940
   685
    val ty = prep_signature thy raw_ty;
haftmann@33940
   686
    val ty' = expand_signature thy ty;
haftmann@33940
   687
    val ty'' = Sign.the_const_type thy c;
haftmann@33940
   688
    val _ = if typ_equiv (ty', ty'') then () else
haftmann@33940
   689
      error ("Illegal constant signature: " ^ Syntax.string_of_typ_global thy ty);
haftmann@33940
   690
  in
haftmann@33940
   691
    thy
haftmann@34173
   692
    |> (map_exec_purge o map_signatures o apsnd) (Symtab.update (c, ty))
haftmann@33940
   693
  end;
haftmann@33940
   694
haftmann@33940
   695
val add_signature = gen_add_signature (K I) cert_signature;
haftmann@33940
   696
val add_signature_cmd = gen_add_signature read_const read_signature;
haftmann@33940
   697
haftmann@33940
   698
haftmann@31962
   699
(* code equations *)
haftmann@31962
   700
haftmann@33075
   701
fun gen_add_eqn default (thm, proper) thy =
haftmann@33075
   702
  let
haftmann@33075
   703
    val thm' = Thm.close_derivation thm;
haftmann@33075
   704
    val c = const_eqn thy thm';
haftmann@33075
   705
  in change_eqns false c (add_thm thy default (thm', proper)) thy end;
haftmann@31962
   706
haftmann@31962
   707
fun add_eqn thm thy =
haftmann@31962
   708
  gen_add_eqn false (mk_eqn thy (thm, true)) thy;
haftmann@31962
   709
haftmann@31962
   710
fun add_warning_eqn thm thy =
haftmann@31962
   711
  case mk_eqn_warning thy thm
haftmann@31962
   712
   of SOME eqn => gen_add_eqn false eqn thy
haftmann@31962
   713
    | NONE => thy;
haftmann@31962
   714
haftmann@31962
   715
fun add_default_eqn thm thy =
haftmann@31962
   716
  case mk_eqn_liberal thy thm
haftmann@31962
   717
   of SOME eqn => gen_add_eqn true eqn thy
haftmann@31962
   718
    | NONE => thy;
haftmann@31962
   719
haftmann@31962
   720
fun add_nbe_eqn thm thy =
haftmann@31962
   721
  gen_add_eqn false (mk_eqn thy (thm, false)) thy;
haftmann@31962
   722
haftmann@31962
   723
val add_default_eqn_attribute = Thm.declaration_attribute
haftmann@31962
   724
  (fn thm => Context.mapping (add_default_eqn thm) I);
haftmann@31962
   725
val add_default_eqn_attrib = Attrib.internal (K add_default_eqn_attribute);
haftmann@31962
   726
haftmann@31962
   727
fun del_eqn thm thy = case mk_eqn_liberal thy thm
haftmann@31962
   728
 of SOME (thm, _) => change_eqns true (const_eqn thy thm) (del_thm thm) thy
haftmann@31962
   729
  | NONE => thy;
haftmann@31962
   730
haftmann@34244
   731
fun del_eqns c = change_eqns true c (K (false, []));
haftmann@34244
   732
haftmann@34244
   733
haftmann@34244
   734
(* cases *)
haftmann@34244
   735
haftmann@34244
   736
fun add_case thm thy =
haftmann@34244
   737
  let
haftmann@34244
   738
    val (c, (k, case_pats)) = case_cert thm;
haftmann@34244
   739
    val _ = case filter_out (is_constr thy) case_pats
haftmann@34244
   740
     of [] => ()
haftmann@34244
   741
      | cs => error ("Non-constructor(s) in case certificate: " ^ commas (map quote cs));
haftmann@34244
   742
    val entry = (1 + Int.max (1, length case_pats), (k, case_pats))
haftmann@34244
   743
  in (map_exec_purge o map_cases o apfst) (Symtab.update (c, entry)) thy end;
haftmann@34244
   744
haftmann@34244
   745
fun add_undefined c thy =
haftmann@34244
   746
  (map_exec_purge o map_cases o apsnd) (Symtab.update (c, ())) thy;
haftmann@34244
   747
haftmann@34244
   748
haftmann@34244
   749
(* datatypes *)
haftmann@34244
   750
haftmann@34244
   751
structure Type_Interpretation =
haftmann@34244
   752
  Interpretation(type T = string * serial val eq = eq_snd (op =) : T * T -> bool);
haftmann@34244
   753
haftmann@34244
   754
fun add_datatype raw_cs thy =
haftmann@34244
   755
  let
haftmann@34244
   756
    val cs = map (fn c_ty as (_, ty) => (AxClass.unoverload_const thy c_ty, ty)) raw_cs;
haftmann@34244
   757
    val (tyco, vs_cos) = constrset_of_consts thy cs;
haftmann@34244
   758
    val old_cs = (map fst o snd o get_datatype thy) tyco;
haftmann@34244
   759
    fun drop_outdated_cases cases = fold Symtab.delete_safe
haftmann@34244
   760
      (Symtab.fold (fn (c, (_, (_, cos))) =>
haftmann@34244
   761
        if exists (member (op =) old_cs) cos
haftmann@34244
   762
          then insert (op =) c else I) cases []) cases;
haftmann@34244
   763
  in
haftmann@34244
   764
    thy
haftmann@34244
   765
    |> fold (del_eqns o fst) cs
haftmann@34244
   766
    |> map_exec_purge
haftmann@34244
   767
        ((map_dtyps o Symtab.map_default (tyco, [])) (cons (serial (), vs_cos))
haftmann@34244
   768
        #> (map_cases o apfst) drop_outdated_cases)
haftmann@34244
   769
    |> Type_Interpretation.data (tyco, serial ())
haftmann@34244
   770
  end;
haftmann@34244
   771
haftmann@34244
   772
fun type_interpretation f =  Type_Interpretation.interpretation
haftmann@34244
   773
  (fn (tyco, _) => fn thy => f (tyco, get_datatype thy tyco) thy);
haftmann@34244
   774
haftmann@34244
   775
fun add_datatype_cmd raw_cs thy =
haftmann@34244
   776
  let
haftmann@34244
   777
    val cs = map (read_bare_const thy) raw_cs;
haftmann@34244
   778
  in add_datatype cs thy end;
haftmann@34244
   779
haftmann@34244
   780
haftmann@32070
   781
(* c.f. src/HOL/Tools/recfun_codegen.ML *)
haftmann@32070
   782
wenzelm@33522
   783
structure Code_Target_Attr = Theory_Data
wenzelm@33522
   784
(
haftmann@31998
   785
  type T = (string -> thm -> theory -> theory) option;
haftmann@31998
   786
  val empty = NONE;
haftmann@31998
   787
  val extend = I;
wenzelm@33522
   788
  fun merge (f1, f2) = if is_some f1 then f1 else f2;
haftmann@31998
   789
);
haftmann@31998
   790
haftmann@32070
   791
fun set_code_target_attr f = Code_Target_Attr.map (K (SOME f));
haftmann@32070
   792
haftmann@32070
   793
fun code_target_attr prefix thm thy =
haftmann@32070
   794
  let
haftmann@32070
   795
    val attr = the_default ((K o K) I) (Code_Target_Attr.get thy);
haftmann@32070
   796
  in thy |> add_warning_eqn thm |> attr prefix thm end;
haftmann@32070
   797
(* setup *)
haftmann@31998
   798
haftmann@31962
   799
val _ = Context.>> (Context.map_theory
haftmann@31962
   800
  (let
haftmann@31962
   801
    fun mk_attribute f = Thm.declaration_attribute (fn thm => Context.mapping (f thm) I);
haftmann@31998
   802
    val code_attribute_parser =
haftmann@31998
   803
      Args.del |-- Scan.succeed (mk_attribute del_eqn)
haftmann@31998
   804
      || Args.$$$ "nbe" |-- Scan.succeed (mk_attribute add_nbe_eqn)
haftmann@31998
   805
      || (Args.$$$ "target" |-- Args.colon |-- Args.name >>
haftmann@32070
   806
           (mk_attribute o code_target_attr))
haftmann@31998
   807
      || Scan.succeed (mk_attribute add_warning_eqn);
haftmann@31962
   808
  in
haftmann@31962
   809
    Type_Interpretation.init
haftmann@31998
   810
    #> Attrib.setup (Binding.name "code") (Scan.lift code_attribute_parser)
haftmann@31998
   811
        "declare theorems for code generation"
haftmann@31962
   812
  end));
haftmann@31962
   813
haftmann@24219
   814
end; (*struct*)
haftmann@24219
   815
haftmann@24219
   816
bulwahn@32661
   817
(** type-safe interfaces for data dependent on executable code **)
haftmann@24219
   818
haftmann@34173
   819
functor Code_Data(Data: CODE_DATA_ARGS): CODE_DATA =
haftmann@24219
   820
struct
haftmann@24219
   821
haftmann@24219
   822
type T = Data.T;
haftmann@24219
   823
exception Data of T;
haftmann@24219
   824
fun dest (Data x) = x
haftmann@24219
   825
haftmann@34173
   826
val kind = Code.declare_data (Data Data.empty);
haftmann@24219
   827
haftmann@24219
   828
val data_op = (kind, Data, dest);
haftmann@24219
   829
haftmann@24219
   830
val change = Code.change_data data_op;
haftmann@24219
   831
fun change_yield thy = Code.change_yield_data data_op thy;
haftmann@24219
   832
haftmann@24219
   833
end;
haftmann@24219
   834
haftmann@28143
   835
structure Code : CODE = struct open Code; end;