author | wenzelm |
Mon, 27 Jun 2011 22:20:49 +0200 | |
changeset 43564 | 9864182c6bad |
parent 42364 | 8c674b3b8e44 |
child 44060 | 656ff92bad48 |
permissions | -rw-r--r-- |
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(* Title: HOL/Tools/Datatype/datatype_realizer.ML |
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Author: Stefan Berghofer, TU Muenchen |
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|
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Program extraction from proofs involving datatypes: |
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realizers for induction and case analysis. |
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Module for defining realizers for induction and case analysis theorems
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*) |
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signature DATATYPE_REALIZER = |
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sig |
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val add_dt_realizers: Datatype.config -> string list -> theory -> theory |
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val setup: theory -> theory |
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end; |
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|
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structure Datatype_Realizer : DATATYPE_REALIZER = |
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struct |
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|
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fun subsets i j = |
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if i <= j then |
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let val is = subsets (i+1) j |
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in map (fn ks => i::ks) is @ is end |
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else [[]]; |
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fun prf_of thm = |
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Reconstruct.reconstruct_proof (Thm.theory_of_thm thm) (Thm.prop_of thm) (Thm.proof_of thm); |
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|
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fun is_unit t = body_type (fastype_of t) = HOLogic.unitT; |
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fun tname_of (Type (s, _)) = s |
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| tname_of _ = ""; |
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fun make_ind sorts ({descr, rec_names, rec_rewrites, induct, ...} : Datatype_Aux.info) is thy = |
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let |
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val recTs = Datatype_Aux.get_rec_types descr sorts; |
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val pnames = if length descr = 1 then ["P"] |
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else map (fn i => "P" ^ string_of_int i) (1 upto length descr); |
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val rec_result_Ts = map (fn ((i, _), P) => |
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if member (op =) is i then TFree ("'" ^ P, HOLogic.typeS) else HOLogic.unitT) |
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(descr ~~ pnames); |
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fun make_pred i T U r x = |
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if member (op =) is i then |
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Free (nth pnames i, T --> U --> HOLogic.boolT) $ r $ x |
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else Free (nth pnames i, U --> HOLogic.boolT) $ x; |
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fun mk_all i s T t = |
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if member (op =) is i then list_all_free ([(s, T)], t) else t; |
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|
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val (prems, rec_fns) = split_list (flat (fst (fold_map |
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(fn ((i, (_, _, constrs)), T) => fold_map (fn (cname, cargs) => fn j => |
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let |
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val Ts = map (Datatype_Aux.typ_of_dtyp descr sorts) cargs; |
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val tnames = Name.variant_list pnames (Datatype_Prop.make_tnames Ts); |
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val recs = filter (Datatype_Aux.is_rec_type o fst o fst) (cargs ~~ tnames ~~ Ts); |
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val frees = tnames ~~ Ts; |
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|
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fun mk_prems vs [] = |
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let |
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val rT = nth (rec_result_Ts) i; |
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val vs' = filter_out is_unit vs; |
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val f = Datatype_Aux.mk_Free "f" (map fastype_of vs' ---> rT) j; |
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val f' = Envir.eta_contract (list_abs_free |
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(map dest_Free vs, if member (op =) is i then list_comb (f, vs') |
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else HOLogic.unit)); |
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in (HOLogic.mk_Trueprop (make_pred i rT T (list_comb (f, vs')) |
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(list_comb (Const (cname, Ts ---> T), map Free frees))), f') |
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end |
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| mk_prems vs (((dt, s), T) :: ds) = |
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let |
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val k = Datatype_Aux.body_index dt; |
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val (Us, U) = strip_type T; |
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val i = length Us; |
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val rT = nth (rec_result_Ts) k; |
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val r = Free ("r" ^ s, Us ---> rT); |
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val (p, f) = mk_prems (vs @ [r]) ds |
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in (mk_all k ("r" ^ s) (Us ---> rT) (Logic.mk_implies |
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(list_all (map (pair "x") Us, HOLogic.mk_Trueprop |
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(make_pred k rT U (Datatype_Aux.app_bnds r i) |
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(Datatype_Aux.app_bnds (Free (s, T)) i))), p)), f) |
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end |
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in (apfst (curry list_all_free frees) (mk_prems (map Free frees) recs), j + 1) end) |
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constrs) (descr ~~ recTs) 1))); |
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fun mk_proj j [] t = t |
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| mk_proj j (i :: is) t = if null is then t else |
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if (j: int) = i then HOLogic.mk_fst t |
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else mk_proj j is (HOLogic.mk_snd t); |
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|
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val tnames = Datatype_Prop.make_tnames recTs; |
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val fTs = map fastype_of rec_fns; |
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val ps = map (fn ((((i, _), T), U), s) => Abs ("x", T, make_pred i U T |
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(list_comb (Const (s, fTs ---> T --> U), rec_fns) $ Bound 0) (Bound 0))) |
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(descr ~~ recTs ~~ rec_result_Ts ~~ rec_names); |
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val r = if null is then Extraction.nullt else |
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foldr1 HOLogic.mk_prod (map_filter (fn (((((i, _), T), U), s), tname) => |
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if member (op =) is i then SOME |
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(list_comb (Const (s, fTs ---> T --> U), rec_fns) $ Free (tname, T)) |
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else NONE) (descr ~~ recTs ~~ rec_result_Ts ~~ rec_names ~~ tnames)); |
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val concl = HOLogic.mk_Trueprop (foldr1 (HOLogic.mk_binop @{const_name HOL.conj}) |
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(map (fn ((((i, _), T), U), tname) => |
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make_pred i U T (mk_proj i is r) (Free (tname, T))) |
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(descr ~~ recTs ~~ rec_result_Ts ~~ tnames))); |
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val cert = cterm_of thy; |
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val inst = map (pairself cert) (map head_of (HOLogic.dest_conj |
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(HOLogic.dest_Trueprop (concl_of induct))) ~~ ps); |
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107 |
|
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val thm = Goal.prove_internal (map cert prems) (cert concl) |
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(fn prems => |
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EVERY [ |
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rewrite_goals_tac (map mk_meta_eq [@{thm fst_conv}, @{thm snd_conv}]), |
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rtac (cterm_instantiate inst induct) 1, |
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ALLGOALS Object_Logic.atomize_prems_tac, |
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rewrite_goals_tac (@{thm o_def} :: map mk_meta_eq rec_rewrites), |
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REPEAT ((resolve_tac prems THEN_ALL_NEW (fn i => |
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REPEAT (etac allE i) THEN atac i)) 1)]) |
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|> Drule.export_without_context; |
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|
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val ind_name = Thm.derivation_name induct; |
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val vs = map (nth pnames) is; |
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val (thm', thy') = thy |
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|> Sign.root_path |
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|> Global_Theory.store_thm |
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(Binding.qualified_name (space_implode "_" (ind_name :: vs @ ["correctness"])), thm) |
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||> Sign.restore_naming thy; |
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|
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127 |
val ivs = rev (Term.add_vars (Logic.varify_global (Datatype_Prop.make_ind [descr] sorts)) []); |
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val rvs = rev (Thm.fold_terms Term.add_vars thm' []); |
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val ivs1 = map Var (filter_out (fn (_, T) => |
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@{type_name bool} = tname_of (body_type T)) ivs); |
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val ivs2 = map (fn (ixn, _) => Var (ixn, the (AList.lookup (op =) rvs ixn))) ivs; |
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|
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val prf = |
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Extraction.abs_corr_shyps thy' induct vs ivs2 |
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(fold_rev (fn (f, p) => fn prf => |
136 |
(case head_of (strip_abs_body f) of |
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137 |
Free (s, T) => |
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138 |
let val T' = Logic.varifyT_global T |
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in Abst (s, SOME T', Proofterm.prf_abstract_over |
140 |
(Var ((s, 0), T')) (AbsP ("H", SOME p, prf))) |
|
141 |
end |
|
142 |
| _ => AbsP ("H", SOME p, prf))) |
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143 |
(rec_fns ~~ prems_of thm) |
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(Proofterm.proof_combP (prf_of thm', map PBound (length prems - 1 downto 0)))); |
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145 |
|
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val r' = |
147 |
if null is then r |
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else Logic.varify_global (fold_rev lambda |
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(map Logic.unvarify_global ivs1 @ filter_out is_unit |
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(map (head_of o strip_abs_body) rec_fns)) r); |
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151 |
|
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in Extraction.add_realizers_i [(ind_name, (vs, r', prf))] thy' end; |
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|
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|
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fun make_casedists sorts |
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({index, descr, case_name, case_rewrites, exhaust, ...} : Datatype_Aux.info) thy = |
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let |
19806 | 158 |
val cert = cterm_of thy; |
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val rT = TFree ("'P", HOLogic.typeS); |
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val rT' = TVar (("'P", 0), HOLogic.typeS); |
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161 |
|
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fun make_casedist_prem T (cname, cargs) = |
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let |
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val Ts = map (Datatype_Aux.typ_of_dtyp descr sorts) cargs; |
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val frees = Name.variant_list ["P", "y"] (Datatype_Prop.make_tnames Ts) ~~ Ts; |
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val free_ts = map Free frees; |
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val r = Free ("r" ^ Long_Name.base_name cname, Ts ---> rT) |
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in (r, list_all_free (frees, Logic.mk_implies (HOLogic.mk_Trueprop |
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(HOLogic.mk_eq (Free ("y", T), list_comb (Const (cname, Ts ---> T), free_ts))), |
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HOLogic.mk_Trueprop (Free ("P", rT --> HOLogic.boolT) $ |
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list_comb (r, free_ts))))) |
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172 |
end; |
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173 |
|
17521 | 174 |
val SOME (_, _, constrs) = AList.lookup (op =) descr index; |
42364 | 175 |
val T = nth (Datatype_Aux.get_rec_types descr sorts) index; |
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val (rs, prems) = split_list (map (make_casedist_prem T) constrs); |
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val r = Const (case_name, map fastype_of rs ---> T --> rT); |
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178 |
|
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val y = Var (("y", 0), Logic.varifyT_global T); |
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val y' = Free ("y", T); |
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181 |
|
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val thm = Goal.prove_internal (map cert prems) |
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(cert (HOLogic.mk_Trueprop (Free ("P", rT --> HOLogic.boolT) $ list_comb (r, rs @ [y'])))) |
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184 |
(fn prems => |
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185 |
EVERY [ |
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rtac (cterm_instantiate [(cert y, cert y')] exhaust) 1, |
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ALLGOALS (EVERY' |
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[asm_simp_tac (HOL_basic_ss addsimps case_rewrites), |
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resolve_tac prems, asm_simp_tac HOL_basic_ss])]) |
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190 |
|> Drule.export_without_context; |
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191 |
|
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val exh_name = Thm.derivation_name exhaust; |
18358 | 193 |
val (thm', thy') = thy |
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194 |
|> Sign.root_path |
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|> Global_Theory.store_thm (Binding.qualified_name (exh_name ^ "_P_correctness"), thm) |
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||> Sign.restore_naming thy; |
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197 |
|
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val P = Var (("P", 0), rT' --> HOLogic.boolT); |
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199 |
val prf = Extraction.abs_corr_shyps thy' exhaust ["P"] [y, P] |
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200 |
(fold_rev (fn (p, r) => fn prf => |
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201 |
Proofterm.forall_intr_proof' (Logic.varify_global r) |
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(AbsP ("H", SOME (Logic.varify_global p), prf))) |
33338 | 203 |
(prems ~~ rs) |
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(Proofterm.proof_combP (prf_of thm', map PBound (length prems - 1 downto 0)))); |
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val prf' = Extraction.abs_corr_shyps thy' exhaust [] |
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206 |
(map Var (Term.add_vars (prop_of exhaust) [])) (prf_of exhaust); |
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207 |
val r' = Logic.varify_global (Abs ("y", T, |
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208 |
list_abs (map dest_Free rs, list_comb (r, |
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209 |
map Bound ((length rs - 1 downto 0) @ [length rs]))))); |
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210 |
|
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211 |
in Extraction.add_realizers_i |
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212 |
[(exh_name, (["P"], r', prf)), |
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213 |
(exh_name, ([], Extraction.nullt, prf'))] thy' |
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214 |
end; |
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215 |
|
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datatype packages: record datatype_config for configuration flags; less verbose signatures
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216 |
fun add_dt_realizers config names thy = |
41698 | 217 |
if not (Proofterm.proofs_enabled ()) then thy |
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218 |
else |
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|
219 |
let |
41423 | 220 |
val _ = Datatype_Aux.message config "Adding realizers for induction and case analysis ..."; |
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221 |
val infos = map (Datatype.the_info thy) names; |
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222 |
val info :: _ = infos; |
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|
223 |
in |
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|
224 |
thy |
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|
225 |
|> fold_rev (make_ind (#sorts info) info) (subsets 0 (length (#descr info) - 1)) |
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226 |
|> fold_rev (make_casedists (#sorts info)) infos |
e71e2c56479c
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227 |
end; |
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228 |
|
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discontinued ancient tradition to suffix certain ML module names with "_package"
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229 |
val setup = Datatype.interpretation add_dt_realizers; |
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Module for defining realizers for induction and case analysis theorems
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230 |
|
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Module for defining realizers for induction and case analysis theorems
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|
231 |
end; |