src/HOL/Decision_Procs/mir_tac.ML
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(*  Title:      HOL/Decision_Procs/mir_tac.ML
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    Author:     Amine Chaieb, TU Muenchen
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*)
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structure Mir_Tac =
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struct
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val trace = ref false;
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fun trace_msg s = if !trace then tracing s else ();
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val mir_ss = 
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let val ths = map thm ["real_of_int_inject", "real_of_int_less_iff", "real_of_int_le_iff"]
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in @{simpset} delsimps ths addsimps (map (fn th => th RS sym) ths)
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end;
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val nT = HOLogic.natT;
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  val nat_arith = map thm ["add_nat_number_of", "diff_nat_number_of", 
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                       "mult_nat_number_of", "eq_nat_number_of", "less_nat_number_of"];
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  val comp_arith = (map thm ["Let_def", "if_False", "if_True", "add_0", 
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                 "add_Suc", "add_number_of_left", "mult_number_of_left", 
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                 "Suc_eq_add_numeral_1"])@
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                 (map (fn s => thm s RS sym) ["numeral_1_eq_1", "numeral_0_eq_0"])
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                 @ @{thms arith_simps} @ nat_arith @ @{thms rel_simps} 
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  val ths = [@{thm "mult_numeral_1"}, @{thm "mult_numeral_1_right"}, 
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             @{thm "real_of_nat_number_of"},
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             @{thm "real_of_nat_Suc"}, @{thm "real_of_nat_one"}, @{thm "real_of_one"},
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             @{thm "real_of_int_zero"}, @{thm "real_of_nat_zero"},
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             @{thm "Ring_and_Field.divide_zero"}, 
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             @{thm "divide_divide_eq_left"}, @{thm "times_divide_eq_right"}, 
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             @{thm "times_divide_eq_left"}, @{thm "divide_divide_eq_right"},
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             @{thm "diff_def"}, @{thm "minus_divide_left"}]
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val comp_ths = ths @ comp_arith @ simp_thms 
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val zdvd_int = @{thm "zdvd_int"};
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val zdiff_int_split = @{thm "zdiff_int_split"};
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val all_nat = @{thm "all_nat"};
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val ex_nat = @{thm "ex_nat"};
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val number_of1 = @{thm "number_of1"};
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val number_of2 = @{thm "number_of2"};
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val split_zdiv = @{thm "split_zdiv"};
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val split_zmod = @{thm "split_zmod"};
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val mod_div_equality' = @{thm "mod_div_equality'"};
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val split_div' = @{thm "split_div'"};
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val Suc_plus1 = @{thm "Suc_plus1"};
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val imp_le_cong = @{thm "imp_le_cong"};
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val conj_le_cong = @{thm "conj_le_cong"};
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val mod_add_eq = @{thm "mod_add_eq"} RS sym;
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val mod_add_left_eq = @{thm "mod_add_left_eq"} RS sym;
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val mod_add_right_eq = @{thm "mod_add_right_eq"} RS sym;
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val nat_div_add_eq = @{thm "div_add1_eq"} RS sym;
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val int_div_add_eq = @{thm "zdiv_zadd1_eq"} RS sym;
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val ZDIVISION_BY_ZERO_MOD = @{thm "DIVISION_BY_ZERO"} RS conjunct2;
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val ZDIVISION_BY_ZERO_DIV = @{thm "DIVISION_BY_ZERO"} RS conjunct1;
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fun prepare_for_mir thy q fm = 
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  let
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    val ps = Logic.strip_params fm
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    val hs = map HOLogic.dest_Trueprop (Logic.strip_assums_hyp fm)
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    val c = HOLogic.dest_Trueprop (Logic.strip_assums_concl fm)
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    fun mk_all ((s, T), (P,n)) =
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      if 0 mem loose_bnos P then
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        (HOLogic.all_const T $ Abs (s, T, P), n)
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      else (incr_boundvars ~1 P, n-1)
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    fun mk_all2 (v, t) = HOLogic.all_const (fastype_of v) $ lambda v t;
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      val rhs = hs
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(*    val (rhs,irhs) = List.partition (relevant (rev ps)) hs *)
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    val np = length ps
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    val (fm',np) =  foldr (fn ((x, T), (fm,n)) => mk_all ((x, T), (fm,n)))
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      (foldr HOLogic.mk_imp c rhs, np) ps
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    val (vs, _) = List.partition (fn t => q orelse (type_of t) = nT)
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      (OldTerm.term_frees fm' @ OldTerm.term_vars fm');
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    val fm2 = foldr mk_all2 fm' vs
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  in (fm2, np + length vs, length rhs) end;
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(*Object quantifier to meta --*)
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fun spec_step n th = if (n=0) then th else (spec_step (n-1) th) RS spec ;
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(* object implication to meta---*)
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fun mp_step n th = if (n=0) then th else (mp_step (n-1) th) RS mp;
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fun mir_tac ctxt q i = 
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    (ObjectLogic.atomize_prems_tac i)
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        THEN (simp_tac (HOL_basic_ss addsimps [@{thm "abs_ge_zero"}] addsimps simp_thms) i)
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        THEN (REPEAT_DETERM (split_tac [@{thm "split_min"}, @{thm "split_max"},@{thm "abs_split"}] i))
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        THEN (fn st =>
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  let
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    val g = List.nth (prems_of st, i - 1)
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    val thy = ProofContext.theory_of ctxt
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    (* Transform the term*)
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    val (t,np,nh) = prepare_for_mir thy q g
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    (* Some simpsets for dealing with mod div abs and nat*)
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    val mod_div_simpset = HOL_basic_ss 
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                        addsimps [refl, mod_add_eq, 
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                                  @{thm "mod_self"}, @{thm "zmod_self"},
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                                  @{thm "zdiv_zero"},@{thm "zmod_zero"},@{thm "div_0"}, @{thm "mod_0"},
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                                  @{thm "div_by_1"}, @{thm "mod_by_1"}, @{thm "div_1"}, @{thm "mod_1"},
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                                  @{thm "Suc_plus1"}]
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                        addsimps @{thms add_ac}
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                        addsimprocs [cancel_div_mod_proc]
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    val simpset0 = HOL_basic_ss
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      addsimps [mod_div_equality', Suc_plus1]
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      addsimps comp_ths
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      addsplits [@{thm "split_zdiv"}, @{thm "split_zmod"}, @{thm "split_div'"}, @{thm "split_min"}, @{thm "split_max"}]
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    (* Simp rules for changing (n::int) to int n *)
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    val simpset1 = HOL_basic_ss
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      addsimps [@{thm "nat_number_of_def"}, @{thm "zdvd_int"}] @ map (fn r => r RS sym)
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        [@{thm "int_int_eq"}, @{thm "zle_int"}, @{thm "zless_int"}, @{thm "zadd_int"}, 
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         @{thm "zmult_int"}]
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      addsplits [@{thm "zdiff_int_split"}]
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    (*simp rules for elimination of int n*)
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    val simpset2 = HOL_basic_ss
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      addsimps [@{thm "nat_0_le"}, @{thm "all_nat"}, @{thm "ex_nat"}, @{thm "number_of1"}, 
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                @{thm "number_of2"}, @{thm "int_0"}, @{thm "int_1"}]
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      addcongs [@{thm "conj_le_cong"}, @{thm "imp_le_cong"}]
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    (* simp rules for elimination of abs *)
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    val ct = cterm_of thy (HOLogic.mk_Trueprop t)
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    (* Theorem for the nat --> int transformation *)
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    val pre_thm = Seq.hd (EVERY
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      [simp_tac mod_div_simpset 1, simp_tac simpset0 1,
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       TRY (simp_tac simpset1 1), TRY (simp_tac simpset2 1), TRY (simp_tac mir_ss 1)]
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      (trivial ct))
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    fun assm_tac i = REPEAT_DETERM_N nh (assume_tac i)
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    (* The result of the quantifier elimination *)
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    val (th, tac) = case (prop_of pre_thm) of
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        Const ("==>", _) $ (Const ("Trueprop", _) $ t1) $ _ =>
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    let val pth =
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          (* If quick_and_dirty then run without proof generation as oracle*)
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             if !quick_and_dirty
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             then mirfr_oracle (false, cterm_of thy (Pattern.eta_long [] t1))
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             else mirfr_oracle (true, cterm_of thy (Pattern.eta_long [] t1))
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    in 
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          (trace_msg ("calling procedure with term:\n" ^
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             Syntax.string_of_term ctxt t1);
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           ((pth RS iffD2) RS pre_thm,
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            assm_tac (i + 1) THEN (if q then I else TRY) (rtac TrueI i)))
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    end
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      | _ => (pre_thm, assm_tac i)
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  in (rtac (((mp_step nh) o (spec_step np)) th) i 
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      THEN tac) st
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  end handle Subscript => no_tac st);
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fun mir_args meth =
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 let val parse_flag = 
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         Args.$$$ "no_quantify" >> (K (K false));
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 in
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   Method.simple_args 
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  (Scan.optional (Args.$$$ "(" |-- Scan.repeat1 parse_flag --| Args.$$$ ")") [] >>
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    curry (Library.foldl op |>) true)
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    (fn q => fn ctxt => meth ctxt q 1)
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  end;
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fun mir_method ctxt q i = Method.METHOD (fn facts =>
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  Method.insert_tac facts 1 THEN mir_tac ctxt q i);
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val setup =
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  Method.add_method ("mir",
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     mir_args mir_method,
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     "decision procedure for MIR arithmetic");
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end