src/Pure/Isar/code.ML
author haftmann
Tue Nov 24 17:28:25 2009 +0100 (2009-11-24)
changeset 33955 fff6f11b1f09
parent 33756 47b7c9e0bf6e
child 33957 e9afca2118d4
permissions -rw-r--r--
curried take/drop
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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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  (*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_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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  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_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 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 curry (uncurry 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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  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, (eqns, (dtyps, cases))) =
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  Spec { history_concluded = history_concluded, eqns = eqns, dtyps = dtyps, cases = cases };
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fun map_spec f (Spec { history_concluded = history_concluded, eqns = eqns,
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  dtyps = dtyps, cases = cases }) =
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  make_spec (f (history_concluded, (eqns, (dtyps, cases))));
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fun merge_spec (Spec { history_concluded = _, eqns = eqns1,
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    dtyps = dtyps1, cases = (cases1, undefs1) },
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  Spec { history_concluded = _, eqns = eqns2,
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    dtyps = dtyps2, cases = (cases2, undefs2) }) =
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  let
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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, (eqns, (dtyps, cases))) end;
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fun history_concluded (Spec { history_concluded, ... }) = history_concluded;
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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_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 = Unsynchronized.ref (Datatab.empty: kind Datatab.table);
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val kind_keys = Unsynchronized.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 _ = Unsynchronized.change kinds (Datatab.update (k, kind));
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    val _ = Unsynchronized.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 Unsynchronized.ref;
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  val empty = (make_spec (false,
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    (Symtab.empty, (Symtab.empty, (Symtab.empty, Symtab.empty)))), Unsynchronized.ref empty_data);
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  fun copy (spec, data) = (spec, Unsynchronized.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), Unsynchronized.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 (Unsynchronized.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, Unsynchronized.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) (fn _ => Unsynchronized.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, [])), [])))
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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, []));
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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 (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))
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        #> map_history_concluded (K true))
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    |> SOME;
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val _ = Context.>> (Context.map_theory (Code_Data.init
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  #> Theory.at_begin continue_history
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  #> Theory.at_end conclude_history));
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(* access to data dependent on abstract executable code *)
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fun get_data (kind, _, dest) = thy_data (get_ensure_init kind #> dest);
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fun change_data (kind, mk, dest) =
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  let
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    fun chnge data_ref f =
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      let
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        val data = get_ensure_init kind data_ref;
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        val data' = f (dest data);
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      in (Unsynchronized.change data_ref (Datatab.update (kind, mk data')); data') end;
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  in thy_data chnge end;
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fun change_yield_data (kind, mk, dest) =
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  let
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    fun chnge data_ref f =
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      let
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        val data = get_ensure_init kind data_ref;
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        val (x, data') = f (dest data);
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      in (x, (Unsynchronized.change data_ref (Datatab.update (kind, mk data')); data')) end;
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  in thy_data chnge end;
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end; (*local*)
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(** foundation **)
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(* constants *)
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fun args_number thy = length o fst o strip_type o Sign.the_const_type thy;
haftmann@31962
   338
haftmann@31962
   339
haftmann@31962
   340
(* datatypes *)
haftmann@31156
   341
haftmann@31156
   342
fun constrset_of_consts thy cs =
haftmann@31156
   343
  let
haftmann@31156
   344
    val _ = map (fn (c, _) => if (is_some o AxClass.class_of_param thy) c
haftmann@31156
   345
      then error ("Is a class parameter: " ^ string_of_const thy c) else ()) cs;
haftmann@33531
   346
    fun no_constr s (c, ty) = error ("Not a datatype constructor:\n" ^ string_of_const thy c
haftmann@33531
   347
      ^ " :: " ^ string_of_typ thy ty ^ "\n" ^ enclose "(" ")" s);
haftmann@31156
   348
    fun last_typ c_ty ty =
haftmann@31156
   349
      let
haftmann@33531
   350
        val tfrees = Term.add_tfreesT ty [];
haftmann@31156
   351
        val (tyco, vs) = ((apsnd o map) (dest_TFree) o dest_Type o snd o strip_type) ty
haftmann@33531
   352
          handle TYPE _ => no_constr "bad type" c_ty
haftmann@33531
   353
        val _ = if has_duplicates (eq_fst (op =)) vs
haftmann@33531
   354
          then no_constr "duplicate type variables in datatype" c_ty else ();
haftmann@33531
   355
        val _ = if length tfrees <> length vs
haftmann@33531
   356
          then no_constr "type variables missing in datatype" c_ty else ();
haftmann@31156
   357
      in (tyco, vs) end;
haftmann@31156
   358
    fun ty_sorts (c, ty) =
haftmann@31156
   359
      let
haftmann@31156
   360
        val ty_decl = (Logic.unvarifyT o Sign.the_const_type thy) c;
haftmann@31156
   361
        val (tyco, _) = last_typ (c, ty) ty_decl;
haftmann@31156
   362
        val (_, vs) = last_typ (c, ty) ty;
haftmann@31156
   363
      in ((tyco, map snd vs), (c, (map fst vs, ty))) end;
haftmann@31156
   364
    fun add ((tyco', sorts'), c) ((tyco, sorts), cs) =
haftmann@31156
   365
      let
haftmann@31998
   366
        val _ = if (tyco' : string) <> tyco
haftmann@31156
   367
          then error "Different type constructors in constructor set"
haftmann@31156
   368
          else ();
haftmann@31156
   369
        val sorts'' = map2 (curry (Sorts.inter_sort (Sign.classes_of thy))) sorts' sorts
haftmann@31156
   370
      in ((tyco, sorts), c :: cs) end;
haftmann@31156
   371
    fun inst vs' (c, (vs, ty)) =
haftmann@31156
   372
      let
haftmann@31156
   373
        val the_v = the o AList.lookup (op =) (vs ~~ vs');
haftmann@31156
   374
        val ty' = map_atyps (fn TFree (v, _) => TFree (the_v v)) ty;
haftmann@31156
   375
      in (c, (fst o strip_type) ty') end;
haftmann@31156
   376
    val c' :: cs' = map ty_sorts cs;
haftmann@31156
   377
    val ((tyco, sorts), cs'') = fold add cs' (apsnd single c');
haftmann@31156
   378
    val vs = Name.names Name.context Name.aT sorts;
haftmann@31156
   379
    val cs''' = map (inst vs) cs'';
haftmann@31156
   380
  in (tyco, (vs, rev cs''')) end;
haftmann@31156
   381
haftmann@31962
   382
fun get_datatype thy tyco =
haftmann@31962
   383
  case these (Symtab.lookup ((the_dtyps o the_exec) thy) tyco)
haftmann@31962
   384
   of (_, spec) :: _ => spec
haftmann@31962
   385
    | [] => Sign.arity_number thy tyco
haftmann@31962
   386
        |> Name.invents Name.context Name.aT
haftmann@31962
   387
        |> map (rpair [])
haftmann@31962
   388
        |> rpair [];
haftmann@31962
   389
haftmann@31962
   390
fun get_datatype_of_constr thy c =
haftmann@31962
   391
  case (snd o strip_type o Sign.the_const_type thy) c
haftmann@31962
   392
   of Type (tyco, _) => if member (op =) ((map fst o snd o get_datatype thy) tyco) c
haftmann@31962
   393
       then SOME tyco else NONE
haftmann@31962
   394
    | _ => NONE;
haftmann@31962
   395
haftmann@31962
   396
fun is_constr thy = is_some o get_datatype_of_constr thy;
haftmann@31962
   397
haftmann@31156
   398
haftmann@31156
   399
(* code equations *)
haftmann@31156
   400
haftmann@31156
   401
exception BAD_THM of string;
haftmann@31156
   402
fun bad_thm msg = raise BAD_THM msg;
haftmann@31156
   403
fun error_thm f thm = f thm handle BAD_THM msg => error msg;
haftmann@31642
   404
fun warning_thm f thm = SOME (f thm) handle BAD_THM msg => (warning msg; NONE)
haftmann@31156
   405
fun try_thm f thm = SOME (f thm) handle BAD_THM _ => NONE;
haftmann@31156
   406
haftmann@31156
   407
fun is_linear thm =
haftmann@31156
   408
  let val (_, args) = (strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of) thm
haftmann@31156
   409
  in not (has_duplicates (op =) ((fold o fold_aterms)
haftmann@31156
   410
    (fn Var (v, _) => cons v | _ => I) args [])) end;
haftmann@31156
   411
haftmann@31962
   412
fun gen_assert_eqn thy is_constr_pat (thm, proper) =
haftmann@31156
   413
  let
haftmann@31156
   414
    val (lhs, rhs) = (Logic.dest_equals o Thm.plain_prop_of) thm
wenzelm@32091
   415
      handle TERM _ => bad_thm ("Not an equation: " ^ Display.string_of_thm_global thy thm)
wenzelm@32091
   416
           | THM _ => bad_thm ("Not an equation: " ^ Display.string_of_thm_global thy thm);
haftmann@31156
   417
    fun vars_of t = fold_aterms (fn Var (v, _) => insert (op =) v
haftmann@31156
   418
      | Free _ => bad_thm ("Illegal free variable in equation\n"
wenzelm@32091
   419
          ^ Display.string_of_thm_global thy thm)
haftmann@31156
   420
      | _ => I) t [];
haftmann@31156
   421
    fun tvars_of t = fold_term_types (fn _ =>
haftmann@31156
   422
      fold_atyps (fn TVar (v, _) => insert (op =) v
haftmann@31156
   423
        | TFree _ => bad_thm 
wenzelm@32091
   424
      ("Illegal free type variable in equation\n" ^ Display.string_of_thm_global thy thm))) t [];
haftmann@31156
   425
    val lhs_vs = vars_of lhs;
haftmann@31156
   426
    val rhs_vs = vars_of rhs;
haftmann@31156
   427
    val lhs_tvs = tvars_of lhs;
haftmann@31156
   428
    val rhs_tvs = tvars_of rhs;
haftmann@31156
   429
    val _ = if null (subtract (op =) lhs_vs rhs_vs)
haftmann@31156
   430
      then ()
haftmann@31156
   431
      else bad_thm ("Free variables on right hand side of equation\n"
wenzelm@32091
   432
        ^ Display.string_of_thm_global thy thm);
haftmann@31156
   433
    val _ = if null (subtract (op =) lhs_tvs rhs_tvs)
haftmann@31156
   434
      then ()
haftmann@31156
   435
      else bad_thm ("Free type variables on right hand side of equation\n"
wenzelm@32091
   436
        ^ Display.string_of_thm_global thy thm)
wenzelm@32091
   437
    val (head, args) = (strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of) thm;
haftmann@31156
   438
    val (c, ty) = case head
haftmann@31156
   439
     of Const (c_ty as (_, ty)) => (AxClass.unoverload_const thy c_ty, ty)
wenzelm@32091
   440
      | _ => bad_thm ("Equation not headed by constant\n" ^ Display.string_of_thm_global thy thm);
haftmann@31156
   441
    fun check _ (Abs _) = bad_thm
haftmann@31156
   442
          ("Abstraction on left hand side of equation\n"
wenzelm@32091
   443
            ^ Display.string_of_thm_global thy thm)
haftmann@31156
   444
      | check 0 (Var _) = ()
haftmann@31156
   445
      | check _ (Var _) = bad_thm
haftmann@31156
   446
          ("Variable with application on left hand side of equation\n"
wenzelm@32091
   447
            ^ Display.string_of_thm_global thy thm)
haftmann@31156
   448
      | check n (t1 $ t2) = (check (n+1) t1; check 0 t2)
haftmann@31156
   449
      | check n (Const (c_ty as (c, ty))) = if n = (length o fst o strip_type) ty
haftmann@31156
   450
          then if not proper orelse is_constr_pat (AxClass.unoverload_const thy c_ty)
haftmann@31156
   451
            then ()
haftmann@31156
   452
            else bad_thm (quote c ^ " is not a constructor, on left hand side of equation\n"
wenzelm@32091
   453
              ^ Display.string_of_thm_global thy thm)
haftmann@31156
   454
          else bad_thm
haftmann@31156
   455
            ("Partially applied constant " ^ quote c ^ " on left hand side of equation\n"
wenzelm@32091
   456
               ^ Display.string_of_thm_global thy thm);
haftmann@31156
   457
    val _ = map (check 0) args;
haftmann@31156
   458
    val _ = if not proper orelse is_linear thm then ()
haftmann@31156
   459
      else bad_thm ("Duplicate variables on left hand side of equation\n"
wenzelm@32091
   460
        ^ Display.string_of_thm_global thy thm);
haftmann@31156
   461
    val _ = if (is_none o AxClass.class_of_param thy) c
haftmann@31156
   462
      then ()
haftmann@31156
   463
      else bad_thm ("Polymorphic constant as head in equation\n"
wenzelm@32091
   464
        ^ Display.string_of_thm_global thy thm)
haftmann@31962
   465
    val _ = if not (is_constr thy c)
haftmann@31156
   466
      then ()
haftmann@31156
   467
      else bad_thm ("Constructor as head in equation\n"
wenzelm@32091
   468
        ^ Display.string_of_thm_global thy thm)
haftmann@31156
   469
    val ty_decl = Sign.the_const_type thy c;
haftmann@31156
   470
    val _ = if Sign.typ_equiv thy (Type.strip_sorts ty_decl, Type.strip_sorts ty)
haftmann@31156
   471
      then () else bad_thm ("Type\n" ^ string_of_typ thy ty
haftmann@31156
   472
           ^ "\nof equation\n"
wenzelm@32091
   473
           ^ Display.string_of_thm_global thy thm
haftmann@31156
   474
           ^ "\nis incompatible with declared function type\n"
haftmann@31156
   475
           ^ string_of_typ thy ty_decl)
haftmann@31156
   476
  in (thm, proper) end;
haftmann@31156
   477
haftmann@31962
   478
fun assert_eqn thy = error_thm (gen_assert_eqn thy (is_constr thy));
haftmann@31962
   479
haftmann@31962
   480
fun meta_rewrite thy = LocalDefs.meta_rewrite_rule (ProofContext.init thy);
haftmann@31156
   481
haftmann@31962
   482
fun mk_eqn thy = error_thm (gen_assert_eqn thy (K true)) o
haftmann@31962
   483
  apfst (meta_rewrite thy);
haftmann@31962
   484
haftmann@31962
   485
fun mk_eqn_warning thy = Option.map (fn (thm, _) => (thm, is_linear thm))
haftmann@31962
   486
  o warning_thm (gen_assert_eqn thy (K true)) o rpair false o meta_rewrite thy;
haftmann@31962
   487
haftmann@31962
   488
fun mk_eqn_liberal thy = Option.map (fn (thm, _) => (thm, is_linear thm))
haftmann@31962
   489
  o try_thm (gen_assert_eqn thy (K true)) o rpair false o meta_rewrite thy;
haftmann@31156
   490
haftmann@31156
   491
(*those following are permissive wrt. to overloaded constants!*)
haftmann@31156
   492
haftmann@32640
   493
val head_eqn = dest_Const o fst o strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of;
haftmann@31957
   494
fun const_typ_eqn thy thm =
haftmann@31156
   495
  let
haftmann@32640
   496
    val (c, ty) = head_eqn thm;
haftmann@31156
   497
    val c' = AxClass.unoverload_const thy (c, ty);
haftmann@31156
   498
  in (c', ty) end;
haftmann@31957
   499
fun const_eqn thy = fst o const_typ_eqn thy;
haftmann@31156
   500
haftmann@32873
   501
fun typscheme thy (c, ty) =
haftmann@32873
   502
  (map dest_TFree (Sign.const_typargs thy (c, ty)), Type.strip_sorts ty);
haftmann@32873
   503
fun typscheme_eqn thy = typscheme thy o apsnd Logic.unvarifyT o const_typ_eqn thy;
haftmann@32873
   504
fun typscheme_eqns thy c [] = 
haftmann@32873
   505
      let
haftmann@32873
   506
        val raw_ty = Sign.the_const_type thy c;
haftmann@32873
   507
        val tvars = Term.add_tvar_namesT raw_ty [];
haftmann@32873
   508
        val tvars' = case AxClass.class_of_param thy c
haftmann@32873
   509
         of SOME class => [TFree (Name.aT, [class])]
haftmann@32873
   510
          | NONE => Name.invent_list [] Name.aT (length tvars)
haftmann@32873
   511
              |> map (fn v => TFree (v, []));
haftmann@32873
   512
        val ty = typ_subst_TVars (tvars ~~ tvars') raw_ty;
haftmann@32873
   513
      in typscheme thy (c, ty) end
haftmann@32873
   514
  | typscheme_eqns thy c (thms as thm :: _) = typscheme_eqn thy thm;
haftmann@32872
   515
haftmann@31962
   516
fun assert_eqns_const thy c eqns =
haftmann@31962
   517
  let
haftmann@31962
   518
    fun cert (eqn as (thm, _)) = if c = const_eqn thy thm
haftmann@31962
   519
      then eqn else error ("Wrong head of code equation,\nexpected constant "
wenzelm@32091
   520
        ^ string_of_const thy c ^ "\n" ^ Display.string_of_thm_global thy thm)
haftmann@31962
   521
  in map (cert o assert_eqn thy) eqns end;
haftmann@31156
   522
haftmann@32929
   523
fun standard_typscheme thy thms =
haftmann@32354
   524
  let
haftmann@32640
   525
    fun tvars_of T = rev (Term.add_tvarsT T []);
haftmann@32640
   526
    val vss = map (tvars_of o snd o head_eqn) thms;
haftmann@32354
   527
    fun inter_sorts vs =
haftmann@32354
   528
      fold (curry (Sorts.inter_sort (Sign.classes_of thy)) o snd) vs [];
haftmann@32354
   529
    val sorts = map_transpose inter_sorts vss;
haftmann@32873
   530
    val vts = Name.names Name.context Name.aT sorts
haftmann@32354
   531
      |> map (fn (v, sort) => TVar ((v, 0), sort));
haftmann@32354
   532
  in map2 (fn vs => Thm.certify_instantiate (vs ~~ vts, [])) vss thms end;
haftmann@31962
   533
haftmann@31962
   534
fun these_eqns thy c =
haftmann@31962
   535
  get_eqns thy c
haftmann@31962
   536
  |> (map o apfst) (Thm.transfer thy)
haftmann@32929
   537
  |> burrow_fst (standard_typscheme thy);
haftmann@31962
   538
haftmann@31962
   539
fun all_eqns thy =
haftmann@31962
   540
  Symtab.dest ((the_eqns o the_exec) thy)
haftmann@33006
   541
  |> maps (snd o snd o fst o snd);
haftmann@31962
   542
haftmann@31962
   543
haftmann@31962
   544
(* cases *)
haftmann@31156
   545
haftmann@31156
   546
fun case_certificate thm =
haftmann@31156
   547
  let
haftmann@31156
   548
    val ((head, raw_case_expr), cases) = (apfst Logic.dest_equals
haftmann@32640
   549
      o apsnd Logic.dest_conjunctions o Logic.dest_implies o Thm.plain_prop_of) thm;
haftmann@31156
   550
    val _ = case head of Free _ => true
haftmann@31156
   551
      | Var _ => true
haftmann@31156
   552
      | _ => raise TERM ("case_cert", []);
haftmann@31156
   553
    val ([(case_var, _)], case_expr) = Term.strip_abs_eta 1 raw_case_expr;
haftmann@31156
   554
    val (Const (case_const, _), raw_params) = strip_comb case_expr;
haftmann@31156
   555
    val n = find_index (fn Free (v, _) => v = case_var | _ => false) raw_params;
haftmann@31156
   556
    val _ = if n = ~1 then raise TERM ("case_cert", []) else ();
haftmann@31156
   557
    val params = map (fst o dest_Var) (nth_drop n raw_params);
haftmann@31156
   558
    fun dest_case t =
haftmann@31156
   559
      let
haftmann@31156
   560
        val (head' $ t_co, rhs) = Logic.dest_equals t;
haftmann@31156
   561
        val _ = if head' = head then () else raise TERM ("case_cert", []);
haftmann@31156
   562
        val (Const (co, _), args) = strip_comb t_co;
haftmann@31156
   563
        val (Var (param, _), args') = strip_comb rhs;
haftmann@31156
   564
        val _ = if args' = args then () else raise TERM ("case_cert", []);
haftmann@31156
   565
      in (param, co) end;
haftmann@31156
   566
    fun analyze_cases cases =
haftmann@31156
   567
      let
haftmann@31156
   568
        val co_list = fold (AList.update (op =) o dest_case) cases [];
haftmann@31156
   569
      in map (the o AList.lookup (op =) co_list) params end;
haftmann@31156
   570
    fun analyze_let t =
haftmann@31156
   571
      let
haftmann@31156
   572
        val (head' $ arg, Var (param', _) $ arg') = Logic.dest_equals t;
haftmann@31156
   573
        val _ = if head' = head then () else raise TERM ("case_cert", []);
haftmann@31156
   574
        val _ = if arg' = arg then () else raise TERM ("case_cert", []);
haftmann@31156
   575
        val _ = if [param'] = params then () else raise TERM ("case_cert", []);
haftmann@31156
   576
      in [] end;
haftmann@31156
   577
    fun analyze (cases as [let_case]) =
haftmann@31156
   578
          (analyze_cases cases handle Bind => analyze_let let_case)
haftmann@31156
   579
      | analyze cases = analyze_cases cases;
haftmann@31156
   580
  in (case_const, (n, analyze cases)) end;
haftmann@31156
   581
haftmann@31156
   582
fun case_cert thm = case_certificate thm
haftmann@31156
   583
  handle Bind => error "bad case certificate"
haftmann@31156
   584
       | TERM _ => error "bad case certificate";
haftmann@31156
   585
haftmann@31962
   586
fun get_case_scheme thy = Symtab.lookup ((fst o the_cases o the_exec) thy);
haftmann@24219
   587
haftmann@31962
   588
val undefineds = Symtab.keys o snd o the_cases o the_exec;
haftmann@24219
   589
haftmann@24219
   590
haftmann@31962
   591
(* diagnostic *)
haftmann@24219
   592
haftmann@24219
   593
fun print_codesetup thy =
haftmann@24219
   594
  let
haftmann@24219
   595
    val ctxt = ProofContext.init thy;
haftmann@24844
   596
    val exec = the_exec thy;
haftmann@33006
   597
    fun pretty_eqns (s, (_, eqns)) =
haftmann@24219
   598
      (Pretty.block o Pretty.fbreaks) (
haftmann@33006
   599
        Pretty.str s :: map (Display.pretty_thm ctxt o fst) eqns
haftmann@24219
   600
      );
haftmann@24219
   601
    fun pretty_dtyp (s, []) =
haftmann@24219
   602
          Pretty.str s
haftmann@24219
   603
      | pretty_dtyp (s, cos) =
haftmann@24219
   604
          (Pretty.block o Pretty.breaks) (
haftmann@24219
   605
            Pretty.str s
haftmann@24219
   606
            :: Pretty.str "="
haftmann@31156
   607
            :: separate (Pretty.str "|") (map (fn (c, []) => Pretty.str (string_of_const thy c)
haftmann@24219
   608
                 | (c, tys) =>
haftmann@24219
   609
                     (Pretty.block o Pretty.breaks)
haftmann@31156
   610
                        (Pretty.str (string_of_const thy c)
wenzelm@26947
   611
                          :: Pretty.str "of"
wenzelm@26947
   612
                          :: map (Pretty.quote o Syntax.pretty_typ_global thy) tys)) cos)
haftmann@24219
   613
          );
haftmann@28368
   614
    val eqns = the_eqns exec
haftmann@24423
   615
      |> Symtab.dest
haftmann@31156
   616
      |> (map o apfst) (string_of_const thy)
haftmann@28695
   617
      |> (map o apsnd) (snd o fst)
haftmann@24219
   618
      |> sort (string_ord o pairself fst);
haftmann@24219
   619
    val dtyps = the_dtyps exec
haftmann@24219
   620
      |> Symtab.dest
haftmann@28695
   621
      |> map (fn (dtco, (_, (vs, cos)) :: _) =>
haftmann@31957
   622
          (string_of_typ thy (Type (dtco, map TFree vs)), cos))
haftmann@24219
   623
      |> sort (string_ord o pairself fst)
haftmann@24219
   624
  in
haftmann@24219
   625
    (Pretty.writeln o Pretty.chunks) [
haftmann@24219
   626
      Pretty.block (
haftmann@30023
   627
        Pretty.str "code equations:"
haftmann@24219
   628
        :: Pretty.fbrk
haftmann@33006
   629
        :: (Pretty.fbreaks o map pretty_eqns) eqns
haftmann@24219
   630
      ),
haftmann@25968
   631
      Pretty.block (
haftmann@24219
   632
        Pretty.str "datatypes:"
haftmann@24219
   633
        :: Pretty.fbrk
haftmann@24219
   634
        :: (Pretty.fbreaks o map pretty_dtyp) dtyps
haftmann@24219
   635
      )
haftmann@24219
   636
    ]
haftmann@24219
   637
  end;
haftmann@24219
   638
haftmann@24219
   639
haftmann@31962
   640
(** declaring executable ingredients **)
haftmann@31962
   641
haftmann@31962
   642
(* datatypes *)
haftmann@31090
   643
wenzelm@33314
   644
structure Type_Interpretation =
wenzelm@33314
   645
  Interpretation(type T = string * serial val eq = eq_snd (op =) : T * T -> bool);
haftmann@25462
   646
haftmann@24423
   647
fun add_datatype raw_cs thy =
haftmann@24219
   648
  let
haftmann@25597
   649
    val cs = map (fn c_ty as (_, ty) => (AxClass.unoverload_const thy c_ty, ty)) raw_cs;
haftmann@31156
   650
    val (tyco, vs_cos) = constrset_of_consts thy cs;
haftmann@30076
   651
    val old_cs = (map fst o snd o get_datatype thy) tyco;
haftmann@30076
   652
    fun drop_outdated_cases cases = fold Symtab.delete_safe
haftmann@30076
   653
      (Symtab.fold (fn (c, (_, (_, cos))) =>
haftmann@30076
   654
        if exists (member (op =) old_cs) cos
haftmann@30076
   655
          then insert (op =) c else I) cases []) cases;
haftmann@24219
   656
  in
haftmann@24219
   657
    thy
haftmann@31091
   658
    |> fold (del_eqns o fst) cs
haftmann@28703
   659
    |> map_exec_purge NONE
haftmann@28695
   660
        ((map_dtyps o Symtab.map_default (tyco, [])) (cons (serial (), vs_cos))
haftmann@30076
   661
        #> (map_cases o apfst) drop_outdated_cases)
haftmann@31962
   662
    |> Type_Interpretation.data (tyco, serial ())
haftmann@24219
   663
  end;
haftmann@24219
   664
haftmann@31962
   665
fun type_interpretation f =  Type_Interpretation.interpretation
haftmann@25485
   666
  (fn (tyco, _) => fn thy => f (tyco, get_datatype thy tyco) thy);
haftmann@25485
   667
haftmann@24423
   668
fun add_datatype_cmd raw_cs thy =
haftmann@24423
   669
  let
haftmann@31156
   670
    val cs = map (read_bare_const thy) raw_cs;
haftmann@24423
   671
  in add_datatype cs thy end;
haftmann@24219
   672
haftmann@31962
   673
haftmann@31962
   674
(* code equations *)
haftmann@31962
   675
haftmann@33075
   676
fun gen_add_eqn default (thm, proper) thy =
haftmann@33075
   677
  let
haftmann@33075
   678
    val thm' = Thm.close_derivation thm;
haftmann@33075
   679
    val c = const_eqn thy thm';
haftmann@33075
   680
  in change_eqns false c (add_thm thy default (thm', proper)) thy end;
haftmann@31962
   681
haftmann@31962
   682
fun add_eqn thm thy =
haftmann@31962
   683
  gen_add_eqn false (mk_eqn thy (thm, true)) thy;
haftmann@31962
   684
haftmann@31962
   685
fun add_warning_eqn thm thy =
haftmann@31962
   686
  case mk_eqn_warning thy thm
haftmann@31962
   687
   of SOME eqn => gen_add_eqn false eqn thy
haftmann@31962
   688
    | NONE => thy;
haftmann@31962
   689
haftmann@31962
   690
fun add_default_eqn thm thy =
haftmann@31962
   691
  case mk_eqn_liberal thy thm
haftmann@31962
   692
   of SOME eqn => gen_add_eqn true eqn thy
haftmann@31962
   693
    | NONE => thy;
haftmann@31962
   694
haftmann@31962
   695
fun add_nbe_eqn thm thy =
haftmann@31962
   696
  gen_add_eqn false (mk_eqn thy (thm, false)) thy;
haftmann@31962
   697
haftmann@31962
   698
val add_default_eqn_attribute = Thm.declaration_attribute
haftmann@31962
   699
  (fn thm => Context.mapping (add_default_eqn thm) I);
haftmann@31962
   700
val add_default_eqn_attrib = Attrib.internal (K add_default_eqn_attribute);
haftmann@31962
   701
haftmann@31962
   702
fun del_eqn thm thy = case mk_eqn_liberal thy thm
haftmann@31962
   703
 of SOME (thm, _) => change_eqns true (const_eqn thy thm) (del_thm thm) thy
haftmann@31962
   704
  | NONE => thy;
haftmann@31962
   705
haftmann@32070
   706
(* c.f. src/HOL/Tools/recfun_codegen.ML *)
haftmann@32070
   707
wenzelm@33522
   708
structure Code_Target_Attr = Theory_Data
wenzelm@33522
   709
(
haftmann@31998
   710
  type T = (string -> thm -> theory -> theory) option;
haftmann@31998
   711
  val empty = NONE;
haftmann@31998
   712
  val extend = I;
wenzelm@33522
   713
  fun merge (f1, f2) = if is_some f1 then f1 else f2;
haftmann@31998
   714
);
haftmann@31998
   715
haftmann@32070
   716
fun set_code_target_attr f = Code_Target_Attr.map (K (SOME f));
haftmann@32070
   717
haftmann@32070
   718
fun code_target_attr prefix thm thy =
haftmann@32070
   719
  let
haftmann@32070
   720
    val attr = the_default ((K o K) I) (Code_Target_Attr.get thy);
haftmann@32070
   721
  in thy |> add_warning_eqn thm |> attr prefix thm end;
haftmann@32070
   722
haftmann@32070
   723
(* setup *)
haftmann@31998
   724
haftmann@31962
   725
val _ = Context.>> (Context.map_theory
haftmann@31962
   726
  (let
haftmann@31962
   727
    fun mk_attribute f = Thm.declaration_attribute (fn thm => Context.mapping (f thm) I);
haftmann@31998
   728
    val code_attribute_parser =
haftmann@31998
   729
      Args.del |-- Scan.succeed (mk_attribute del_eqn)
haftmann@31998
   730
      || Args.$$$ "nbe" |-- Scan.succeed (mk_attribute add_nbe_eqn)
haftmann@31998
   731
      || (Args.$$$ "target" |-- Args.colon |-- Args.name >>
haftmann@32070
   732
           (mk_attribute o code_target_attr))
haftmann@31998
   733
      || Scan.succeed (mk_attribute add_warning_eqn);
haftmann@31962
   734
  in
haftmann@31962
   735
    Type_Interpretation.init
haftmann@31998
   736
    #> Attrib.setup (Binding.name "code") (Scan.lift code_attribute_parser)
haftmann@31998
   737
        "declare theorems for code generation"
haftmann@31962
   738
  end));
haftmann@31962
   739
haftmann@31962
   740
haftmann@31962
   741
(* cases *)
haftmann@31962
   742
haftmann@24844
   743
fun add_case thm thy =
haftmann@24844
   744
  let
haftmann@31156
   745
    val (c, (k, case_pats)) = case_cert thm;
haftmann@31088
   746
    val _ = case filter_out (is_constr thy) case_pats
haftmann@30076
   747
     of [] => ()
haftmann@30076
   748
      | cs => error ("Non-constructor(s) in case certificate: " ^ commas (map quote cs));
haftmann@30076
   749
    val entry = (1 + Int.max (1, length case_pats), (k, case_pats))
haftmann@30076
   750
  in (map_exec_purge (SOME [c]) o map_cases o apfst) (Symtab.update (c, entry)) thy end;
haftmann@24844
   751
haftmann@24844
   752
fun add_undefined c thy =
haftmann@24844
   753
  (map_exec_purge (SOME [c]) o map_cases o apsnd) (Symtab.update (c, ())) thy;
haftmann@24844
   754
haftmann@24219
   755
end; (*struct*)
haftmann@24219
   756
haftmann@24219
   757
bulwahn@32661
   758
(** type-safe interfaces for data dependent on executable code **)
haftmann@24219
   759
haftmann@31962
   760
functor Code_Data_Fun(Data: CODE_DATA_ARGS): CODE_DATA =
haftmann@24219
   761
struct
haftmann@24219
   762
haftmann@24219
   763
type T = Data.T;
haftmann@24219
   764
exception Data of T;
haftmann@24219
   765
fun dest (Data x) = x
haftmann@24219
   766
haftmann@24219
   767
val kind = Code.declare_data (Data Data.empty)
haftmann@27609
   768
  (fn thy => fn cs => fn Data x => Data (Data.purge thy cs x));
haftmann@24219
   769
haftmann@24219
   770
val data_op = (kind, Data, dest);
haftmann@24219
   771
haftmann@24219
   772
val get = Code.get_data data_op;
haftmann@24219
   773
val change = Code.change_data data_op;
haftmann@24219
   774
fun change_yield thy = Code.change_yield_data data_op thy;
haftmann@24219
   775
haftmann@24219
   776
end;
haftmann@24219
   777
haftmann@28143
   778
structure Code : CODE = struct open Code; end;