src/HOL/Tools/Predicate_Compile/predicate_compile_aux.ML
author haftmann
Thu Jun 10 12:24:03 2010 +0200 (2010-06-10)
changeset 37391 476270a6c2dc
parent 36610 bafd82950e24
child 37678 0040bafffdef
permissions -rw-r--r--
tuned quotes, antiquotations and whitespace
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(*  Title:      HOL/Tools/Predicate_Compile/predicate_compile_aux.ML
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    Author:     Lukas Bulwahn, TU Muenchen
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Auxilary functions for predicate compiler.
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*)
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signature PREDICATE_COMPILE_AUX =
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sig
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  (* general functions *)
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  val apfst3 : ('a -> 'd) -> 'a * 'b * 'c -> 'd * 'b * 'c
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  val apsnd3 : ('b -> 'd) -> 'a * 'b * 'c -> 'a * 'd * 'c
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  val aptrd3 : ('c -> 'd) -> 'a * 'b * 'c -> 'a * 'b * 'd
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  val find_indices : ('a -> bool) -> 'a list -> int list
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  val assert : bool -> unit
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  (* mode *)
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  datatype mode = Bool | Input | Output | Pair of mode * mode | Fun of mode * mode
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  val eq_mode : mode * mode -> bool
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  val list_fun_mode : mode list -> mode
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  val strip_fun_mode : mode -> mode list
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  val dest_fun_mode : mode -> mode list
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  val dest_tuple_mode : mode -> mode list
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  val all_modes_of_typ : typ -> mode list
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  val all_smodes_of_typ : typ -> mode list
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  val fold_map_aterms_prodT : ('a -> 'a -> 'a) -> (typ -> 'b -> 'a * 'b) -> typ -> 'b -> 'a * 'b
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  val map_filter_prod : (term -> term option) -> term -> term option
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  val replace_ho_args : mode -> term list -> term list -> term list
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  val ho_arg_modes_of : mode -> mode list
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  val ho_argsT_of : mode -> typ list -> typ list
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  val ho_args_of : mode -> term list -> term list
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  val split_map_mode : (mode -> term -> term option * term option)
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    -> mode -> term list -> term list * term list
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  val split_map_modeT : (mode -> typ -> typ option * typ option)
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    -> mode -> typ list -> typ list * typ list
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  val split_mode : mode -> term list -> term list * term list
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  val split_modeT' : mode -> typ list -> typ list * typ list
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  val string_of_mode : mode -> string
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  val ascii_string_of_mode : mode -> string
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  (* premises *)
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  datatype indprem = Prem of term | Negprem of term | Sidecond of term
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    | Generator of (string * typ)
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  val dest_indprem : indprem -> term
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  val map_indprem : (term -> term) -> indprem -> indprem
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  (* general syntactic functions *)
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  val conjuncts : term -> term list
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  val is_equationlike : thm -> bool
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  val is_pred_equation : thm -> bool
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  val is_intro : string -> thm -> bool
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  val is_predT : typ -> bool
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  val is_constrt : theory -> term -> bool
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  val is_constr : Proof.context -> string -> bool
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  val focus_ex : term -> Name.context -> ((string * typ) list * term) * Name.context
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  val strip_all : term -> (string * typ) list * term
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  (* introduction rule combinators *)
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  val map_atoms : (term -> term) -> term -> term
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  val fold_atoms : (term -> 'a -> 'a) -> term -> 'a -> 'a
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  val fold_map_atoms : (term -> 'a -> term * 'a) -> term -> 'a -> term * 'a
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  val maps_premises : (term -> term list) -> term -> term
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  val map_concl : (term -> term) -> term -> term
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  val map_term : theory -> (term -> term) -> thm -> thm
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  (* split theorems of case expressions *)
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  val prepare_split_thm : Proof.context -> thm -> thm
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  val find_split_thm : theory -> term -> thm option
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  (* datastructures and setup for generic compilation *)
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  datatype compilation_funs = CompilationFuns of {
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    mk_predT : typ -> typ,
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    dest_predT : typ -> typ,
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    mk_bot : typ -> term,
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    mk_single : term -> term,
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    mk_bind : term * term -> term,
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    mk_sup : term * term -> term,
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    mk_if : term -> term,
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    mk_iterate_upto : typ -> term * term * term -> term,
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    mk_not : term -> term,
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    mk_map : typ -> typ -> term -> term -> term
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  };
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  val mk_predT : compilation_funs -> typ -> typ
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  val dest_predT : compilation_funs -> typ -> typ
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  val mk_bot : compilation_funs -> typ -> term
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  val mk_single : compilation_funs -> term -> term
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  val mk_bind : compilation_funs -> term * term -> term
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  val mk_sup : compilation_funs -> term * term -> term
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  val mk_if : compilation_funs -> term -> term
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  val mk_iterate_upto : compilation_funs -> typ -> term * term * term -> term
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  val mk_not : compilation_funs -> term -> term
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  val mk_map : compilation_funs -> typ -> typ -> term -> term -> term
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  val funT_of : compilation_funs -> mode -> typ -> typ
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  (* Different compilations *)
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  datatype compilation = Pred | Depth_Limited | Random | Depth_Limited_Random | DSeq | Annotated
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    | Pos_Random_DSeq | Neg_Random_DSeq | New_Pos_Random_DSeq | New_Neg_Random_DSeq
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  val negative_compilation_of : compilation -> compilation
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  val compilation_for_polarity : bool -> compilation -> compilation
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  val string_of_compilation : compilation -> string
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  val compilation_names : (string * compilation) list
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  val non_random_compilations : compilation list
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  val random_compilations : compilation list
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  (* Different options for compiler *)
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  datatype options = Options of {  
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    expected_modes : (string * mode list) option,
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    proposed_modes : (string * mode list) option,
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    proposed_names : ((string * mode) * string) list,
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    show_steps : bool,
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    show_proof_trace : bool,
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    show_intermediate_results : bool,
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    show_mode_inference : bool,
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    show_modes : bool,
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    show_compilation : bool,
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    show_caught_failures : bool,
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    skip_proof : bool,
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    no_topmost_reordering : bool,
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    function_flattening : bool,
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    fail_safe_function_flattening : bool,
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    specialise : bool,
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    no_higher_order_predicate : string list,
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    inductify : bool,
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    detect_switches : bool,
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    compilation : compilation
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  };
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  val expected_modes : options -> (string * mode list) option
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  val proposed_modes : options -> (string * mode list) option
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  val proposed_names : options -> string -> mode -> string option
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  val show_steps : options -> bool
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  val show_proof_trace : options -> bool
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  val show_intermediate_results : options -> bool
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  val show_mode_inference : options -> bool
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  val show_modes : options -> bool
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  val show_compilation : options -> bool
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  val show_caught_failures : options -> bool
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  val skip_proof : options -> bool
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  val no_topmost_reordering : options -> bool
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  val function_flattening : options -> bool
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  val fail_safe_function_flattening : options -> bool
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  val specialise : options -> bool
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  val no_higher_order_predicate : options -> string list
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  val is_inductify : options -> bool
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  val detect_switches : options -> bool
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  val compilation : options -> compilation
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  val default_options : options
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  val bool_options : string list
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  val print_step : options -> string -> unit
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  (* simple transformations *)
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  val expand_tuples : theory -> thm -> thm
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  val eta_contract_ho_arguments : theory -> thm -> thm
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  val remove_equalities : theory -> thm -> thm
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  val remove_pointless_clauses : thm -> thm list
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  val peephole_optimisation : theory -> thm -> thm option
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end;
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structure Predicate_Compile_Aux : PREDICATE_COMPILE_AUX =
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struct
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(* general functions *)
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fun apfst3 f (x, y, z) = (f x, y, z)
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fun apsnd3 f (x, y, z) = (x, f y, z)
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fun aptrd3 f (x, y, z) = (x, y, f z)
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fun comb_option f (SOME x1, SOME x2) = SOME (f (x1, x2))
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  | comb_option f (NONE, SOME x2) = SOME x2
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  | comb_option f (SOME x1, NONE) = SOME x1
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  | comb_option f (NONE, NONE) = NONE
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fun map2_optional f (x :: xs) (y :: ys) = f x (SOME y) :: (map2_optional f xs ys)
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  | map2_optional f (x :: xs) [] = (f x NONE) :: (map2_optional f xs [])
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  | map2_optional f [] [] = []
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fun find_indices f xs =
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  map_filter (fn (i, true) => SOME i | (i, false) => NONE) (map_index (apsnd f) xs)
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fun assert check = if check then () else raise Fail "Assertion failed!"
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(* mode *)
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datatype mode = Bool | Input | Output | Pair of mode * mode | Fun of mode * mode
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(* equality of instantiatedness with respect to equivalences:
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  Pair Input Input == Input and Pair Output Output == Output *)
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fun eq_mode (Fun (m1, m2), Fun (m3, m4)) = eq_mode (m1, m3) andalso eq_mode (m2, m4)
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  | eq_mode (Pair (m1, m2), Pair (m3, m4)) = eq_mode (m1, m3) andalso eq_mode (m2, m4)
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  | eq_mode (Pair (m1, m2), Input) = eq_mode (m1, Input) andalso eq_mode (m2, Input)
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  | eq_mode (Pair (m1, m2), Output) = eq_mode (m1, Output) andalso eq_mode (m2, Output)
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  | eq_mode (Input, Pair (m1, m2)) = eq_mode (Input, m1) andalso eq_mode (Input, m2)
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  | eq_mode (Output, Pair (m1, m2)) = eq_mode (Output, m1) andalso eq_mode (Output, m2)
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  | eq_mode (Input, Input) = true
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  | eq_mode (Output, Output) = true
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  | eq_mode (Bool, Bool) = true
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  | eq_mode _ = false
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fun list_fun_mode [] = Bool
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  | list_fun_mode (m :: ms) = Fun (m, list_fun_mode ms)
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(* name: binder_modes? *)
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fun strip_fun_mode (Fun (mode, mode')) = mode :: strip_fun_mode mode'
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  | strip_fun_mode Bool = []
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  | strip_fun_mode _ = raise Fail "Bad mode for strip_fun_mode"
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(* name: strip_fun_mode? *)
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fun dest_fun_mode (Fun (mode, mode')) = mode :: dest_fun_mode mode'
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  | dest_fun_mode mode = [mode]
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fun dest_tuple_mode (Pair (mode, mode')) = mode :: dest_tuple_mode mode'
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  | dest_tuple_mode _ = []
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fun all_modes_of_typ' (T as Type ("fun", _)) = 
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  let
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    val (S, U) = strip_type T
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  in
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    if U = HOLogic.boolT then
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      fold_rev (fn m1 => fn m2 => map_product (curry Fun) m1 m2)
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        (map all_modes_of_typ' S) [Bool]
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    else
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      [Input, Output]
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  end
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  | all_modes_of_typ' (Type (@{type_name "*"}, [T1, T2])) = 
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    map_product (curry Pair) (all_modes_of_typ' T1) (all_modes_of_typ' T2)
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  | all_modes_of_typ' _ = [Input, Output]
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fun all_modes_of_typ (T as Type ("fun", _)) =
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    let
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      val (S, U) = strip_type T
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    in
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      if U = @{typ bool} then
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        fold_rev (fn m1 => fn m2 => map_product (curry Fun) m1 m2)
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          (map all_modes_of_typ' S) [Bool]
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      else
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        [Input, Output]
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    end
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  | all_modes_of_typ @{typ bool} = [Bool]
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  | all_modes_of_typ T = all_modes_of_typ' T
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fun all_smodes_of_typ (T as Type ("fun", _)) =
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  let
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    val (S, U) = strip_type T
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    fun all_smodes (Type (@{type_name "*"}, [T1, T2])) = 
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      map_product (curry Pair) (all_smodes T1) (all_smodes T2)
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      | all_smodes _ = [Input, Output]
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  in
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    if U = HOLogic.boolT then
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      fold_rev (fn m1 => fn m2 => map_product (curry Fun) m1 m2) (map all_smodes S) [Bool]
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    else
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      raise Fail "invalid type for predicate"
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  end
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fun ho_arg_modes_of mode =
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  let
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    fun ho_arg_mode (m as Fun _) =  [m]
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      | ho_arg_mode (Pair (m1, m2)) = ho_arg_mode m1 @ ho_arg_mode m2
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      | ho_arg_mode _ = []
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  in
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    maps ho_arg_mode (strip_fun_mode mode)
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  end
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fun ho_args_of mode ts =
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  let
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    fun ho_arg (Fun _) (SOME t) = [t]
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      | ho_arg (Fun _) NONE = raise Fail "mode and term do not match"
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      | ho_arg (Pair (m1, m2)) (SOME (Const (@{const_name Pair}, _) $ t1 $ t2)) =
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          ho_arg m1 (SOME t1) @ ho_arg m2 (SOME t2)
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      | ho_arg (Pair (m1, m2)) NONE = ho_arg m1 NONE @ ho_arg m2 NONE
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      | ho_arg _ _ = []
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  in
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    flat (map2_optional ho_arg (strip_fun_mode mode) ts)
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  end
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(* temporary function should be replaced by unsplit_input or so? *)
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fun replace_ho_args mode hoargs ts =
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  let
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    fun replace (Fun _, _) (arg' :: hoargs') = (arg', hoargs')
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      | replace (Pair (m1, m2), Const (@{const_name Pair}, T) $ t1 $ t2) hoargs =
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        let
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          val (t1', hoargs') = replace (m1, t1) hoargs
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          val (t2', hoargs'') = replace (m2, t2) hoargs'
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        in
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          (Const (@{const_name Pair}, T) $ t1' $ t2', hoargs'')
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        end
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      | replace (_, t) hoargs = (t, hoargs)
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  in
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    fst (fold_map replace (strip_fun_mode mode ~~ ts) hoargs)
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  end
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fun ho_argsT_of mode Ts =
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  let
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    fun ho_arg (Fun _) T = [T]
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      | ho_arg (Pair (m1, m2)) (Type (@{type_name "*"}, [T1, T2])) = ho_arg m1 T1 @ ho_arg m2 T2
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      | ho_arg _ _ = []
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  in
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    flat (map2 ho_arg (strip_fun_mode mode) Ts)
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  end
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(* splits mode and maps function to higher-order argument types *)
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fun split_map_mode f mode ts =
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  let
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    fun split_arg_mode' (m as Fun _) t = f m t
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      | split_arg_mode' (Pair (m1, m2)) (Const (@{const_name Pair}, _) $ t1 $ t2) =
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        let
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          val (i1, o1) = split_arg_mode' m1 t1
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          val (i2, o2) = split_arg_mode' m2 t2
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        in
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          (comb_option HOLogic.mk_prod (i1, i2), comb_option HOLogic.mk_prod (o1, o2))
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        end
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      | split_arg_mode' m t =
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   301
        if eq_mode (m, Input) then (SOME t, NONE)
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   302
        else if eq_mode (m, Output) then (NONE,  SOME t)
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   303
        else raise Fail "split_map_mode: mode and term do not match"
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   304
  in
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   305
    (pairself (map_filter I) o split_list) (map2 split_arg_mode' (strip_fun_mode mode) ts)
bulwahn@34948
   306
  end
bulwahn@34948
   307
bulwahn@34948
   308
(* splits mode and maps function to higher-order argument types *)
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   309
fun split_map_modeT f mode Ts =
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   310
  let
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   311
    fun split_arg_mode' (m as Fun _) T = f m T
bulwahn@35885
   312
      | split_arg_mode' (Pair (m1, m2)) (Type (@{type_name "*"}, [T1, T2])) =
bulwahn@34948
   313
        let
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   314
          val (i1, o1) = split_arg_mode' m1 T1
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   315
          val (i2, o2) = split_arg_mode' m2 T2
bulwahn@34948
   316
        in
bulwahn@34948
   317
          (comb_option HOLogic.mk_prodT (i1, i2), comb_option HOLogic.mk_prodT (o1, o2))
bulwahn@34948
   318
        end
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   319
      | split_arg_mode' Input T = (SOME T, NONE)
bulwahn@34948
   320
      | split_arg_mode' Output T = (NONE,  SOME T)
bulwahn@35885
   321
      | split_arg_mode' _ _ = raise Fail "split_modeT': mode and type do not match"
bulwahn@34948
   322
  in
bulwahn@34948
   323
    (pairself (map_filter I) o split_list) (map2 split_arg_mode' (strip_fun_mode mode) Ts)
bulwahn@34948
   324
  end
bulwahn@34948
   325
bulwahn@34948
   326
fun split_mode mode ts = split_map_mode (fn _ => fn _ => (NONE, NONE)) mode ts
bulwahn@34948
   327
bulwahn@35885
   328
fun fold_map_aterms_prodT comb f (Type (@{type_name "*"}, [T1, T2])) s =
bulwahn@34948
   329
  let
bulwahn@34948
   330
    val (x1, s') = fold_map_aterms_prodT comb f T1 s
bulwahn@34948
   331
    val (x2, s'') = fold_map_aterms_prodT comb f T2 s'
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   332
  in
bulwahn@34948
   333
    (comb x1 x2, s'')
bulwahn@34948
   334
  end
bulwahn@34948
   335
  | fold_map_aterms_prodT comb f T s = f T s
bulwahn@34948
   336
haftmann@37391
   337
fun map_filter_prod f (Const (@{const_name Pair}, _) $ t1 $ t2) =
bulwahn@34948
   338
  comb_option HOLogic.mk_prod (map_filter_prod f t1, map_filter_prod f t2)
bulwahn@34948
   339
  | map_filter_prod f t = f t
bulwahn@34948
   340
bulwahn@34948
   341
(* obviously, split_mode' and split_modeT' do not match? where does that cause problems? *)
bulwahn@34948
   342
  
bulwahn@34948
   343
fun split_modeT' mode Ts =
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   344
  let
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   345
    fun split_arg_mode' (Fun _) T = ([], [])
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   346
      | split_arg_mode' (Pair (m1, m2)) (Type (@{type_name "*"}, [T1, T2])) =
bulwahn@34948
   347
        let
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   348
          val (i1, o1) = split_arg_mode' m1 T1
bulwahn@34948
   349
          val (i2, o2) = split_arg_mode' m2 T2
bulwahn@34948
   350
        in
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   351
          (i1 @ i2, o1 @ o2)
bulwahn@34948
   352
        end
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   353
      | split_arg_mode' Input T = ([T], [])
bulwahn@34948
   354
      | split_arg_mode' Output T = ([], [T])
bulwahn@35885
   355
      | split_arg_mode' _ _ = raise Fail "split_modeT': mode and type do not match"
bulwahn@34948
   356
  in
bulwahn@34948
   357
    (pairself flat o split_list) (map2 split_arg_mode' (strip_fun_mode mode) Ts)
bulwahn@34948
   358
  end
bulwahn@34948
   359
bulwahn@34948
   360
fun string_of_mode mode =
bulwahn@33619
   361
  let
bulwahn@33619
   362
    fun string_of_mode1 Input = "i"
bulwahn@33619
   363
      | string_of_mode1 Output = "o"
bulwahn@33619
   364
      | string_of_mode1 Bool = "bool"
bulwahn@33619
   365
      | string_of_mode1 mode = "(" ^ (string_of_mode3 mode) ^ ")"
bulwahn@33626
   366
    and string_of_mode2 (Pair (m1, m2)) = string_of_mode3 m1 ^ " * " ^  string_of_mode2 m2
bulwahn@33619
   367
      | string_of_mode2 mode = string_of_mode1 mode
bulwahn@33619
   368
    and string_of_mode3 (Fun (m1, m2)) = string_of_mode2 m1 ^ " => " ^ string_of_mode3 m2
bulwahn@33619
   369
      | string_of_mode3 mode = string_of_mode2 mode
bulwahn@34948
   370
  in string_of_mode3 mode end
bulwahn@33619
   371
bulwahn@34948
   372
fun ascii_string_of_mode mode' =
bulwahn@33626
   373
  let
bulwahn@33626
   374
    fun ascii_string_of_mode' Input = "i"
bulwahn@33626
   375
      | ascii_string_of_mode' Output = "o"
bulwahn@33626
   376
      | ascii_string_of_mode' Bool = "b"
bulwahn@33626
   377
      | ascii_string_of_mode' (Pair (m1, m2)) =
bulwahn@33626
   378
          "P" ^ ascii_string_of_mode' m1 ^ ascii_string_of_mode'_Pair m2
bulwahn@33626
   379
      | ascii_string_of_mode' (Fun (m1, m2)) = 
bulwahn@33626
   380
          "F" ^ ascii_string_of_mode' m1 ^ ascii_string_of_mode'_Fun m2 ^ "B"
bulwahn@33626
   381
    and ascii_string_of_mode'_Fun (Fun (m1, m2)) =
bulwahn@33626
   382
          ascii_string_of_mode' m1 ^ (if m2 = Bool then "" else "_" ^ ascii_string_of_mode'_Fun m2)
bulwahn@33626
   383
      | ascii_string_of_mode'_Fun Bool = "B"
bulwahn@33626
   384
      | ascii_string_of_mode'_Fun m = ascii_string_of_mode' m
bulwahn@33626
   385
    and ascii_string_of_mode'_Pair (Pair (m1, m2)) =
bulwahn@33626
   386
          ascii_string_of_mode' m1 ^ ascii_string_of_mode'_Pair m2
bulwahn@33626
   387
      | ascii_string_of_mode'_Pair m = ascii_string_of_mode' m
bulwahn@33626
   388
  in ascii_string_of_mode'_Fun mode' end
bulwahn@33626
   389
bulwahn@34948
   390
(* premises *)
bulwahn@33619
   391
bulwahn@34948
   392
datatype indprem = Prem of term | Negprem of term | Sidecond of term
bulwahn@34948
   393
  | Generator of (string * typ);
bulwahn@33619
   394
bulwahn@36251
   395
fun dest_indprem (Prem t) = t
bulwahn@36251
   396
  | dest_indprem (Negprem t) = t
bulwahn@36251
   397
  | dest_indprem (Sidecond t) = t
bulwahn@36251
   398
  | dest_indprem (Generator _) = raise Fail "cannot destruct generator"
bulwahn@36251
   399
bulwahn@36254
   400
fun map_indprem f (Prem t) = Prem (f t)
bulwahn@36254
   401
  | map_indprem f (Negprem t) = Negprem (f t)
bulwahn@36254
   402
  | map_indprem f (Sidecond t) = Sidecond (f t)
bulwahn@36254
   403
  | map_indprem f (Generator (v, T)) = Generator (dest_Free (f (Free (v, T))))
bulwahn@36254
   404
bulwahn@33250
   405
(* general syntactic functions *)
bulwahn@33250
   406
bulwahn@33250
   407
(*Like dest_conj, but flattens conjunctions however nested*)
bulwahn@33250
   408
fun conjuncts_aux (Const ("op &", _) $ t $ t') conjs = conjuncts_aux t (conjuncts_aux t' conjs)
bulwahn@33250
   409
  | conjuncts_aux t conjs = t::conjs;
bulwahn@33250
   410
bulwahn@33250
   411
fun conjuncts t = conjuncts_aux t [];
bulwahn@33250
   412
bulwahn@33250
   413
fun is_equationlike_term (Const ("==", _) $ _ $ _) = true
bulwahn@33250
   414
  | is_equationlike_term (Const ("Trueprop", _) $ (Const ("op =", _) $ _ $ _)) = true
bulwahn@33250
   415
  | is_equationlike_term _ = false
bulwahn@33250
   416
  
bulwahn@33250
   417
val is_equationlike = is_equationlike_term o prop_of 
bulwahn@33250
   418
bulwahn@33250
   419
fun is_pred_equation_term (Const ("==", _) $ u $ v) =
bulwahn@33250
   420
  (fastype_of u = @{typ bool}) andalso (fastype_of v = @{typ bool})
bulwahn@33250
   421
  | is_pred_equation_term _ = false
bulwahn@33250
   422
  
bulwahn@33250
   423
val is_pred_equation = is_pred_equation_term o prop_of 
bulwahn@33250
   424
bulwahn@33250
   425
fun is_intro_term constname t =
bulwahn@34948
   426
  the_default false (try (fn t => case fst (strip_comb (HOLogic.dest_Trueprop (Logic.strip_imp_concl t))) of
bulwahn@33250
   427
    Const (c, _) => c = constname
bulwahn@34948
   428
  | _ => false) t)
bulwahn@33250
   429
  
bulwahn@33250
   430
fun is_intro constname t = is_intro_term constname (prop_of t)
bulwahn@33250
   431
bulwahn@33250
   432
fun is_pred thy constname =
bulwahn@33250
   433
  let
bulwahn@33250
   434
    val T = (Sign.the_const_type thy constname)
bulwahn@33250
   435
  in body_type T = @{typ "bool"} end;
bulwahn@33250
   436
bulwahn@35885
   437
fun is_predT (T as Type("fun", [_, _])) = (snd (strip_type T) = @{typ bool})
bulwahn@33250
   438
  | is_predT _ = false
bulwahn@33250
   439
bulwahn@33250
   440
(*** check if a term contains only constructor functions ***)
bulwahn@34948
   441
(* TODO: another copy in the core! *)
bulwahn@33623
   442
(* FIXME: constructor terms are supposed to be seen in the way the code generator
bulwahn@33623
   443
  sees constructors.*)
bulwahn@33250
   444
fun is_constrt thy =
bulwahn@33250
   445
  let
bulwahn@33250
   446
    val cnstrs = flat (maps
bulwahn@33250
   447
      (map (fn (_, (Tname, _, cs)) => map (apsnd (rpair Tname o length)) cs) o #descr o snd)
bulwahn@33250
   448
      (Symtab.dest (Datatype.get_all thy)));
bulwahn@33250
   449
    fun check t = (case strip_comb t of
bulwahn@36032
   450
        (Var _, []) => true
bulwahn@36032
   451
      | (Free _, []) => true
bulwahn@33250
   452
      | (Const (s, T), ts) => (case (AList.lookup (op =) cnstrs s, body_type T) of
bulwahn@33250
   453
            (SOME (i, Tname), Type (Tname', _)) => length ts = i andalso Tname = Tname' andalso forall check ts
bulwahn@33250
   454
          | _ => false)
bulwahn@33250
   455
      | _ => false)
bulwahn@36032
   456
  in check end;
bulwahn@34948
   457
bulwahn@34948
   458
fun is_funtype (Type ("fun", [_, _])) = true
bulwahn@34948
   459
  | is_funtype _ = false;
bulwahn@34948
   460
bulwahn@34948
   461
fun is_Type (Type _) = true
bulwahn@34948
   462
  | is_Type _ = false
bulwahn@34948
   463
bulwahn@34948
   464
(* returns true if t is an application of an datatype constructor *)
bulwahn@34948
   465
(* which then consequently would be splitted *)
bulwahn@34948
   466
(* else false *)
bulwahn@34948
   467
(*
bulwahn@34948
   468
fun is_constructor thy t =
bulwahn@34948
   469
  if (is_Type (fastype_of t)) then
bulwahn@34948
   470
    (case DatatypePackage.get_datatype thy ((fst o dest_Type o fastype_of) t) of
bulwahn@34948
   471
      NONE => false
bulwahn@34948
   472
    | SOME info => (let
bulwahn@34948
   473
      val constr_consts = maps (fn (_, (_, _, constrs)) => map fst constrs) (#descr info)
bulwahn@34948
   474
      val (c, _) = strip_comb t
bulwahn@34948
   475
      in (case c of
bulwahn@34948
   476
        Const (name, _) => name mem_string constr_consts
bulwahn@34948
   477
        | _ => false) end))
bulwahn@34948
   478
  else false
bulwahn@34948
   479
*)
bulwahn@34948
   480
bulwahn@35891
   481
val is_constr = Code.is_constr o ProofContext.theory_of;
bulwahn@34948
   482
bulwahn@36047
   483
fun strip_all t = (Term.strip_all_vars t, Term.strip_all_body t)
bulwahn@36047
   484
bulwahn@33250
   485
fun strip_ex (Const ("Ex", _) $ Abs (x, T, t)) =
bulwahn@33250
   486
  let
bulwahn@33250
   487
    val (xTs, t') = strip_ex t
bulwahn@33250
   488
  in
bulwahn@33250
   489
    ((x, T) :: xTs, t')
bulwahn@33250
   490
  end
bulwahn@33250
   491
  | strip_ex t = ([], t)
bulwahn@33250
   492
bulwahn@33250
   493
fun focus_ex t nctxt =
bulwahn@33250
   494
  let
bulwahn@33250
   495
    val ((xs, Ts), t') = apfst split_list (strip_ex t) 
bulwahn@33250
   496
    val (xs', nctxt') = Name.variants xs nctxt;
bulwahn@33250
   497
    val ps' = xs' ~~ Ts;
bulwahn@33250
   498
    val vs = map Free ps';
bulwahn@33250
   499
    val t'' = Term.subst_bounds (rev vs, t');
bulwahn@33250
   500
  in ((ps', t''), nctxt') end;
bulwahn@33250
   501
bulwahn@33250
   502
(* introduction rule combinators *)
bulwahn@33250
   503
bulwahn@33250
   504
fun map_atoms f intro = 
bulwahn@33250
   505
  let
bulwahn@33250
   506
    val (literals, head) = Logic.strip_horn intro
bulwahn@33250
   507
    fun appl t = (case t of
bulwahn@35885
   508
        (@{term Not} $ t') => HOLogic.mk_not (f t')
bulwahn@33250
   509
      | _ => f t)
bulwahn@33250
   510
  in
bulwahn@33250
   511
    Logic.list_implies
bulwahn@33250
   512
      (map (HOLogic.mk_Trueprop o appl o HOLogic.dest_Trueprop) literals, head)
bulwahn@33250
   513
  end
bulwahn@33250
   514
bulwahn@33250
   515
fun fold_atoms f intro s =
bulwahn@33250
   516
  let
bulwahn@33250
   517
    val (literals, head) = Logic.strip_horn intro
bulwahn@33250
   518
    fun appl t s = (case t of
bulwahn@35885
   519
      (@{term Not} $ t') => f t' s
bulwahn@33250
   520
      | _ => f t s)
bulwahn@33250
   521
  in fold appl (map HOLogic.dest_Trueprop literals) s end
bulwahn@33250
   522
bulwahn@33250
   523
fun fold_map_atoms f intro s =
bulwahn@33250
   524
  let
bulwahn@33250
   525
    val (literals, head) = Logic.strip_horn intro
bulwahn@33250
   526
    fun appl t s = (case t of
bulwahn@35885
   527
      (@{term Not} $ t') => apfst HOLogic.mk_not (f t' s)
bulwahn@33250
   528
      | _ => f t s)
bulwahn@33250
   529
    val (literals', s') = fold_map appl (map HOLogic.dest_Trueprop literals) s
bulwahn@33250
   530
  in
bulwahn@33250
   531
    (Logic.list_implies (map HOLogic.mk_Trueprop literals', head), s')
bulwahn@33250
   532
  end;
bulwahn@33250
   533
bulwahn@36246
   534
fun map_premises f intro =
bulwahn@36246
   535
  let
bulwahn@36246
   536
    val (premises, head) = Logic.strip_horn intro
bulwahn@36246
   537
  in
bulwahn@36246
   538
    Logic.list_implies (map f premises, head)
bulwahn@36246
   539
  end
bulwahn@36246
   540
bulwahn@36246
   541
fun map_filter_premises f intro =
bulwahn@36246
   542
  let
bulwahn@36246
   543
    val (premises, head) = Logic.strip_horn intro
bulwahn@36246
   544
  in
bulwahn@36246
   545
    Logic.list_implies (map_filter f premises, head)
bulwahn@36246
   546
  end
bulwahn@36246
   547
bulwahn@33250
   548
fun maps_premises f intro =
bulwahn@33250
   549
  let
bulwahn@33250
   550
    val (premises, head) = Logic.strip_horn intro
bulwahn@33250
   551
  in
bulwahn@33250
   552
    Logic.list_implies (maps f premises, head)
bulwahn@33250
   553
  end
bulwahn@35324
   554
bulwahn@35875
   555
fun map_concl f intro =
bulwahn@35875
   556
  let
bulwahn@35875
   557
    val (premises, head) = Logic.strip_horn intro
bulwahn@35875
   558
  in
bulwahn@35875
   559
    Logic.list_implies (premises, f head)
bulwahn@35875
   560
  end
bulwahn@35875
   561
bulwahn@35875
   562
(* combinators to apply a function to all basic parts of nested products *)
bulwahn@35875
   563
haftmann@37391
   564
fun map_products f (Const (@{const_name Pair}, T) $ t1 $ t2) =
haftmann@37391
   565
  Const (@{const_name Pair}, T) $ map_products f t1 $ map_products f t2
bulwahn@35875
   566
  | map_products f t = f t
bulwahn@35324
   567
bulwahn@35324
   568
(* split theorems of case expressions *)
bulwahn@35324
   569
bulwahn@35324
   570
fun prepare_split_thm ctxt split_thm =
bulwahn@35324
   571
    (split_thm RS @{thm iffD2})
wenzelm@35624
   572
    |> Local_Defs.unfold ctxt [@{thm atomize_conjL[symmetric]},
bulwahn@35324
   573
      @{thm atomize_all[symmetric]}, @{thm atomize_imp[symmetric]}]
bulwahn@35324
   574
bulwahn@36029
   575
fun find_split_thm thy (Const (name, T)) = Option.map #split (Datatype_Data.info_of_case thy name)
bulwahn@36029
   576
  | find_split_thm thy _ = NONE
bulwahn@35324
   577
bulwahn@33250
   578
(* lifting term operations to theorems *)
bulwahn@33250
   579
bulwahn@33250
   580
fun map_term thy f th =
bulwahn@33250
   581
  Skip_Proof.make_thm thy (f (prop_of th))
bulwahn@33250
   582
bulwahn@33250
   583
(*
bulwahn@33250
   584
fun equals_conv lhs_cv rhs_cv ct =
bulwahn@33250
   585
  case Thm.term_of ct of
bulwahn@33250
   586
    Const ("==", _) $ _ $ _ => Conv.arg_conv cv ct  
bulwahn@33250
   587
  | _ => error "equals_conv"  
bulwahn@33250
   588
*)
bulwahn@33250
   589
bulwahn@36038
   590
(* Different compilations *)
bulwahn@33250
   591
bulwahn@35881
   592
datatype compilation = Pred | Depth_Limited | Random | Depth_Limited_Random | DSeq | Annotated
bulwahn@36018
   593
  | Pos_Random_DSeq | Neg_Random_DSeq | New_Pos_Random_DSeq | New_Neg_Random_DSeq
bulwahn@35324
   594
bulwahn@35324
   595
fun negative_compilation_of Pos_Random_DSeq = Neg_Random_DSeq
bulwahn@35324
   596
  | negative_compilation_of Neg_Random_DSeq = Pos_Random_DSeq
bulwahn@36018
   597
  | negative_compilation_of New_Pos_Random_DSeq = New_Neg_Random_DSeq
bulwahn@36018
   598
  | negative_compilation_of New_Neg_Random_DSeq = New_Pos_Random_DSeq
bulwahn@35324
   599
  | negative_compilation_of c = c
bulwahn@35324
   600
  
bulwahn@35324
   601
fun compilation_for_polarity false Pos_Random_DSeq = Neg_Random_DSeq
bulwahn@36018
   602
  | compilation_for_polarity false New_Pos_Random_DSeq = New_Neg_Random_DSeq
bulwahn@35324
   603
  | compilation_for_polarity _ c = c
bulwahn@34948
   604
bulwahn@35885
   605
fun string_of_compilation c =
bulwahn@35885
   606
  case c of
bulwahn@34948
   607
    Pred => ""
bulwahn@34948
   608
  | Random => "random"
bulwahn@34948
   609
  | Depth_Limited => "depth limited"
bulwahn@35881
   610
  | Depth_Limited_Random => "depth limited random"
bulwahn@34948
   611
  | DSeq => "dseq"
bulwahn@34948
   612
  | Annotated => "annotated"
bulwahn@35324
   613
  | Pos_Random_DSeq => "pos_random dseq"
bulwahn@35324
   614
  | Neg_Random_DSeq => "neg_random_dseq"
bulwahn@36018
   615
  | New_Pos_Random_DSeq => "new_pos_random dseq"
bulwahn@36018
   616
  | New_Neg_Random_DSeq => "new_neg_random_dseq"
bulwahn@36038
   617
bulwahn@36018
   618
val compilation_names = [("pred", Pred),
bulwahn@36018
   619
  ("random", Random),
bulwahn@36018
   620
  ("depth_limited", Depth_Limited),
bulwahn@36018
   621
  ("depth_limited_random", Depth_Limited_Random),
bulwahn@36018
   622
  (*("annotated", Annotated),*)
bulwahn@36018
   623
  ("dseq", DSeq), ("random_dseq", Pos_Random_DSeq),
bulwahn@36018
   624
  ("new_random_dseq", New_Pos_Random_DSeq)]
bulwahn@36038
   625
bulwahn@36038
   626
val non_random_compilations = [Pred, Depth_Limited, DSeq, Annotated]
bulwahn@36038
   627
bulwahn@36038
   628
bulwahn@36038
   629
val random_compilations = [Random, Depth_Limited_Random,
bulwahn@36038
   630
  Pos_Random_DSeq, Neg_Random_DSeq, New_Pos_Random_DSeq, New_Neg_Random_DSeq]
bulwahn@36038
   631
bulwahn@36046
   632
(* datastructures and setup for generic compilation *)
bulwahn@36046
   633
bulwahn@36046
   634
datatype compilation_funs = CompilationFuns of {
bulwahn@36046
   635
  mk_predT : typ -> typ,
bulwahn@36046
   636
  dest_predT : typ -> typ,
bulwahn@36046
   637
  mk_bot : typ -> term,
bulwahn@36046
   638
  mk_single : term -> term,
bulwahn@36046
   639
  mk_bind : term * term -> term,
bulwahn@36046
   640
  mk_sup : term * term -> term,
bulwahn@36046
   641
  mk_if : term -> term,
bulwahn@36049
   642
  mk_iterate_upto : typ -> term * term * term -> term,
bulwahn@36046
   643
  mk_not : term -> term,
bulwahn@36046
   644
  mk_map : typ -> typ -> term -> term -> term
bulwahn@36046
   645
};
bulwahn@36038
   646
bulwahn@36046
   647
fun mk_predT (CompilationFuns funs) = #mk_predT funs
bulwahn@36046
   648
fun dest_predT (CompilationFuns funs) = #dest_predT funs
bulwahn@36046
   649
fun mk_bot (CompilationFuns funs) = #mk_bot funs
bulwahn@36046
   650
fun mk_single (CompilationFuns funs) = #mk_single funs
bulwahn@36046
   651
fun mk_bind (CompilationFuns funs) = #mk_bind funs
bulwahn@36046
   652
fun mk_sup (CompilationFuns funs) = #mk_sup funs
bulwahn@36046
   653
fun mk_if (CompilationFuns funs) = #mk_if funs
bulwahn@36049
   654
fun mk_iterate_upto (CompilationFuns funs) = #mk_iterate_upto funs
bulwahn@36046
   655
fun mk_not (CompilationFuns funs) = #mk_not funs
bulwahn@36046
   656
fun mk_map (CompilationFuns funs) = #mk_map funs
bulwahn@36046
   657
bulwahn@36046
   658
(** function types and names of different compilations **)
bulwahn@36046
   659
bulwahn@36046
   660
fun funT_of compfuns mode T =
bulwahn@36046
   661
  let
bulwahn@36046
   662
    val Ts = binder_types T
bulwahn@36046
   663
    val (inTs, outTs) = split_map_modeT (fn m => fn T => (SOME (funT_of compfuns m T), NONE)) mode Ts
bulwahn@36046
   664
  in
bulwahn@36046
   665
    inTs ---> (mk_predT compfuns (HOLogic.mk_tupleT outTs))
bulwahn@36046
   666
  end;
bulwahn@36046
   667
bulwahn@36046
   668
(* Different options for compiler *)
bulwahn@34948
   669
bulwahn@33250
   670
datatype options = Options of {  
bulwahn@34948
   671
  expected_modes : (string * mode list) option,
bulwahn@34948
   672
  proposed_modes : (string * mode list) option,
bulwahn@34948
   673
  proposed_names : ((string * mode) * string) list,
bulwahn@33250
   674
  show_steps : bool,
bulwahn@33250
   675
  show_proof_trace : bool,
bulwahn@33250
   676
  show_intermediate_results : bool,
bulwahn@33251
   677
  show_mode_inference : bool,
bulwahn@33251
   678
  show_modes : bool,
bulwahn@33250
   679
  show_compilation : bool,
bulwahn@35324
   680
  show_caught_failures : bool,
bulwahn@33250
   681
  skip_proof : bool,
bulwahn@35324
   682
  no_topmost_reordering : bool,
bulwahn@35324
   683
  function_flattening : bool,
bulwahn@36248
   684
  specialise : bool,
bulwahn@35324
   685
  fail_safe_function_flattening : bool,
bulwahn@35324
   686
  no_higher_order_predicate : string list,
bulwahn@33250
   687
  inductify : bool,
bulwahn@36254
   688
  detect_switches : bool,
bulwahn@34948
   689
  compilation : compilation
bulwahn@33250
   690
};
bulwahn@33250
   691
bulwahn@33250
   692
fun expected_modes (Options opt) = #expected_modes opt
bulwahn@33752
   693
fun proposed_modes (Options opt) = #proposed_modes opt
bulwahn@34948
   694
fun proposed_names (Options opt) name mode = AList.lookup (eq_pair (op =) eq_mode)
bulwahn@33623
   695
  (#proposed_names opt) (name, mode)
bulwahn@33620
   696
bulwahn@33250
   697
fun show_steps (Options opt) = #show_steps opt
bulwahn@33250
   698
fun show_intermediate_results (Options opt) = #show_intermediate_results opt
bulwahn@33250
   699
fun show_proof_trace (Options opt) = #show_proof_trace opt
bulwahn@33251
   700
fun show_modes (Options opt) = #show_modes opt
bulwahn@33251
   701
fun show_mode_inference (Options opt) = #show_mode_inference opt
bulwahn@33250
   702
fun show_compilation (Options opt) = #show_compilation opt
bulwahn@35324
   703
fun show_caught_failures (Options opt) = #show_caught_failures opt
bulwahn@35324
   704
bulwahn@33250
   705
fun skip_proof (Options opt) = #skip_proof opt
bulwahn@33250
   706
bulwahn@35324
   707
fun function_flattening (Options opt) = #function_flattening opt
bulwahn@35324
   708
fun fail_safe_function_flattening (Options opt) = #fail_safe_function_flattening opt
bulwahn@36248
   709
fun specialise (Options opt) = #specialise opt
bulwahn@35324
   710
fun no_topmost_reordering (Options opt) = #no_topmost_reordering opt
bulwahn@35324
   711
fun no_higher_order_predicate (Options opt) = #no_higher_order_predicate opt
bulwahn@35324
   712
bulwahn@33250
   713
fun is_inductify (Options opt) = #inductify opt
bulwahn@34948
   714
bulwahn@34948
   715
fun compilation (Options opt) = #compilation opt
bulwahn@33250
   716
bulwahn@36254
   717
fun detect_switches (Options opt) = #detect_switches opt
bulwahn@36254
   718
bulwahn@33250
   719
val default_options = Options {
bulwahn@33250
   720
  expected_modes = NONE,
bulwahn@33752
   721
  proposed_modes = NONE,
bulwahn@33623
   722
  proposed_names = [],
bulwahn@33250
   723
  show_steps = false,
bulwahn@33250
   724
  show_intermediate_results = false,
bulwahn@33250
   725
  show_proof_trace = false,
bulwahn@33251
   726
  show_modes = false,
bulwahn@33250
   727
  show_mode_inference = false,
bulwahn@33250
   728
  show_compilation = false,
bulwahn@35324
   729
  show_caught_failures = false,
bulwahn@34948
   730
  skip_proof = true,
bulwahn@35324
   731
  no_topmost_reordering = false,
bulwahn@35324
   732
  function_flattening = false,
bulwahn@36248
   733
  specialise = false,
bulwahn@35324
   734
  fail_safe_function_flattening = false,
bulwahn@35324
   735
  no_higher_order_predicate = [],
bulwahn@33250
   736
  inductify = false,
bulwahn@36254
   737
  detect_switches = true,
bulwahn@34948
   738
  compilation = Pred
bulwahn@33250
   739
}
bulwahn@33250
   740
bulwahn@34948
   741
val bool_options = ["show_steps", "show_intermediate_results", "show_proof_trace", "show_modes",
bulwahn@35381
   742
  "show_mode_inference", "show_compilation", "skip_proof", "inductify", "no_function_flattening",
bulwahn@36254
   743
  "detect_switches", "specialise", "no_topmost_reordering"]
bulwahn@34948
   744
bulwahn@33250
   745
fun print_step options s =
bulwahn@33250
   746
  if show_steps options then tracing s else ()
bulwahn@33250
   747
bulwahn@36047
   748
(* simple transformations *)
bulwahn@36047
   749
bulwahn@36047
   750
(** tuple processing **)
bulwahn@33250
   751
bulwahn@33250
   752
fun expand_tuples thy intro =
bulwahn@33250
   753
  let
bulwahn@33250
   754
    fun rewrite_args [] (pats, intro_t, ctxt) = (pats, intro_t, ctxt)
bulwahn@33250
   755
      | rewrite_args (arg::args) (pats, intro_t, ctxt) = 
bulwahn@33250
   756
      (case HOLogic.strip_tupleT (fastype_of arg) of
bulwahn@33250
   757
        (Ts as _ :: _ :: _) =>
bulwahn@33250
   758
        let
haftmann@37391
   759
          fun rewrite_arg' (Const (@{const_name Pair}, _) $ _ $ t2, Type (@{type_name "*"}, [_, T2]))
bulwahn@33250
   760
            (args, (pats, intro_t, ctxt)) = rewrite_arg' (t2, T2) (args, (pats, intro_t, ctxt))
bulwahn@35885
   761
            | rewrite_arg' (t, Type (@{type_name "*"}, [T1, T2])) (args, (pats, intro_t, ctxt)) =
bulwahn@33250
   762
              let
bulwahn@33250
   763
                val ([x, y], ctxt') = Variable.variant_fixes ["x", "y"] ctxt
bulwahn@33250
   764
                val pat = (t, HOLogic.mk_prod (Free (x, T1), Free (y, T2)))
bulwahn@33250
   765
                val intro_t' = Pattern.rewrite_term thy [pat] [] intro_t
bulwahn@33250
   766
                val args' = map (Pattern.rewrite_term thy [pat] []) args
bulwahn@33250
   767
              in
bulwahn@33250
   768
                rewrite_arg' (Free (y, T2), T2) (args', (pat::pats, intro_t', ctxt'))
bulwahn@33250
   769
              end
bulwahn@33250
   770
            | rewrite_arg' _ (args, (pats, intro_t, ctxt)) = (args, (pats, intro_t, ctxt))
bulwahn@33250
   771
          val (args', (pats, intro_t', ctxt')) = rewrite_arg' (arg, fastype_of arg)
bulwahn@33250
   772
            (args, (pats, intro_t, ctxt))
bulwahn@33250
   773
        in
bulwahn@33250
   774
          rewrite_args args' (pats, intro_t', ctxt')
bulwahn@33250
   775
        end
bulwahn@33250
   776
      | _ => rewrite_args args (pats, intro_t, ctxt))
bulwahn@33250
   777
    fun rewrite_prem atom =
bulwahn@33250
   778
      let
bulwahn@33250
   779
        val (_, args) = strip_comb atom
bulwahn@33250
   780
      in rewrite_args args end
wenzelm@36610
   781
    val ctxt = ProofContext.init_global thy
bulwahn@33250
   782
    val (((T_insts, t_insts), [intro']), ctxt1) = Variable.import false [intro] ctxt
bulwahn@33250
   783
    val intro_t = prop_of intro'
bulwahn@33250
   784
    val concl = Logic.strip_imp_concl intro_t
bulwahn@33250
   785
    val (p, args) = strip_comb (HOLogic.dest_Trueprop concl)
bulwahn@33250
   786
    val (pats', intro_t', ctxt2) = rewrite_args args ([], intro_t, ctxt1)
bulwahn@33250
   787
    val (pats', intro_t', ctxt3) = 
bulwahn@33250
   788
      fold_atoms rewrite_prem intro_t' (pats', intro_t', ctxt2)
bulwahn@33250
   789
    fun rewrite_pat (ct1, ct2) =
bulwahn@33250
   790
      (ct1, cterm_of thy (Pattern.rewrite_term thy pats' [] (term_of ct2)))
bulwahn@33250
   791
    val t_insts' = map rewrite_pat t_insts
bulwahn@33250
   792
    val intro'' = Thm.instantiate (T_insts, t_insts') intro
bulwahn@33250
   793
    val [intro'''] = Variable.export ctxt3 ctxt [intro'']
bulwahn@33250
   794
    val intro'''' = Simplifier.full_simplify
bulwahn@33250
   795
      (HOL_basic_ss addsimps [@{thm fst_conv}, @{thm snd_conv}, @{thm Pair_eq}])
bulwahn@33250
   796
      intro'''
bulwahn@33250
   797
    (* splitting conjunctions introduced by Pair_eq*)
bulwahn@33250
   798
    fun split_conj prem =
bulwahn@33250
   799
      map HOLogic.mk_Trueprop (conjuncts (HOLogic.dest_Trueprop prem))
bulwahn@33250
   800
    val intro''''' = map_term thy (maps_premises split_conj) intro''''
bulwahn@33250
   801
  in
bulwahn@33250
   802
    intro'''''
bulwahn@33250
   803
  end
bulwahn@33250
   804
bulwahn@36047
   805
(** eta contract higher-order arguments **)
bulwahn@35875
   806
bulwahn@35875
   807
fun eta_contract_ho_arguments thy intro =
bulwahn@35875
   808
  let
bulwahn@35875
   809
    fun f atom = list_comb (apsnd ((map o map_products) Envir.eta_contract) (strip_comb atom))
bulwahn@35875
   810
  in
bulwahn@35875
   811
    map_term thy (map_concl f o map_atoms f) intro
bulwahn@35875
   812
  end
bulwahn@35875
   813
bulwahn@36047
   814
(** remove equalities **)
bulwahn@36022
   815
bulwahn@36022
   816
fun remove_equalities thy intro =
bulwahn@36022
   817
  let
bulwahn@36022
   818
    fun remove_eqs intro_t =
bulwahn@36022
   819
      let
bulwahn@36022
   820
        val (prems, concl) = Logic.strip_horn intro_t
bulwahn@36022
   821
        fun remove_eq (prems, concl) =
bulwahn@36022
   822
          let
bulwahn@36022
   823
            fun removable_eq prem =
bulwahn@36022
   824
              case try (HOLogic.dest_eq o HOLogic.dest_Trueprop) prem of
bulwahn@36022
   825
                SOME (lhs, rhs) => (case lhs of
bulwahn@36022
   826
                  Var _ => true
bulwahn@36022
   827
                  | _ => (case rhs of Var _ => true | _ => false))
bulwahn@36022
   828
              | NONE => false
bulwahn@36022
   829
          in
bulwahn@36022
   830
            case find_first removable_eq prems of
bulwahn@36022
   831
              NONE => (prems, concl)
bulwahn@36022
   832
            | SOME eq =>
bulwahn@36022
   833
              let
bulwahn@36022
   834
                val (lhs, rhs) = HOLogic.dest_eq (HOLogic.dest_Trueprop eq)
bulwahn@36022
   835
                val prems' = remove (op =) eq prems
bulwahn@36022
   836
                val subst = (case lhs of
bulwahn@36022
   837
                  (v as Var _) =>
bulwahn@36022
   838
                    (fn t => if t = v then rhs else t)
bulwahn@36022
   839
                | _ => (case rhs of
bulwahn@36022
   840
                   (v as Var _) => (fn t => if t = v then lhs else t)))
bulwahn@36022
   841
              in
bulwahn@36022
   842
                remove_eq (map (map_aterms subst) prems', map_aterms subst concl)
bulwahn@36022
   843
              end
bulwahn@36022
   844
          end
bulwahn@36022
   845
      in
bulwahn@36022
   846
        Logic.list_implies (remove_eq (prems, concl))
bulwahn@36022
   847
      end
bulwahn@36022
   848
  in
bulwahn@36022
   849
    map_term thy remove_eqs intro
bulwahn@36022
   850
  end
bulwahn@35875
   851
bulwahn@36246
   852
(* Some last processing *)
bulwahn@36246
   853
bulwahn@36246
   854
fun remove_pointless_clauses intro =
bulwahn@36246
   855
  if Logic.strip_imp_prems (prop_of intro) = [@{prop "False"}] then
bulwahn@36246
   856
    []
bulwahn@36246
   857
  else [intro]
bulwahn@36246
   858
bulwahn@36246
   859
(* some peephole optimisations *)
bulwahn@36246
   860
bulwahn@36246
   861
fun peephole_optimisation thy intro =
bulwahn@36246
   862
  let
wenzelm@36610
   863
    val process =
wenzelm@36610
   864
      MetaSimplifier.rewrite_rule (Predicate_Compile_Simps.get (ProofContext.init_global thy))
bulwahn@36246
   865
    fun process_False intro_t =
bulwahn@36246
   866
      if member (op =) (Logic.strip_imp_prems intro_t) @{prop "False"} then NONE else SOME intro_t
bulwahn@36246
   867
    fun process_True intro_t =
bulwahn@36246
   868
      map_filter_premises (fn p => if p = @{prop True} then NONE else SOME p) intro_t
bulwahn@36246
   869
  in
bulwahn@36246
   870
    Option.map (Skip_Proof.make_thm thy)
bulwahn@36246
   871
      (process_False (process_True (prop_of (process intro))))
bulwahn@36246
   872
  end
bulwahn@36246
   873
bulwahn@33250
   874
end;