author | blanchet |
Fri, 31 Jan 2014 16:10:39 +0100 | |
changeset 55212 | 5832470d956e |
parent 55202 | 824c48a539c9 |
child 55213 | dcb36a2540bc |
permissions | -rw-r--r-- |
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(* Title: HOL/Tools/Sledgehammer/sledgehammer_isar_minimize.ML |
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Author: Steffen Juilf Smolka, TU Muenchen |
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Author: Jasmin Blanchette, TU Muenchen |
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Minimize dependencies (used facts) of Isar proof steps. |
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*) |
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signature SLEDGEHAMMER_ISAR_MINIMIZE = |
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sig |
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type preplay_data = Sledgehammer_Isar_Preplay.preplay_data |
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type isar_step = Sledgehammer_Isar_Proof.isar_step |
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type isar_proof = Sledgehammer_Isar_Proof.isar_proof |
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val minimal_deps_of_step : preplay_data -> isar_step -> isar_step |
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val postprocess_remove_unreferenced_steps : (isar_step -> isar_step) -> isar_proof -> isar_proof |
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end; |
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structure Sledgehammer_Isar_Minimize : SLEDGEHAMMER_ISAR_MINIMIZE = |
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struct |
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open Sledgehammer_Reconstructor |
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open Sledgehammer_Isar_Proof |
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open Sledgehammer_Isar_Preplay |
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val slack = seconds 0.1 |
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fun minimal_deps_of_step (_ : preplay_data) (step as Let _) = step |
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| minimal_deps_of_step {get_preplay_outcome, set_preplay_outcome, preplay_quietly, ...} |
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(step as Prove (qs, xs, l, t, subproofs, ((lfs, gfs), meth))) = |
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(case get_preplay_outcome l of |
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Played time => |
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let |
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fun mk_step_lfs_gfs lfs gfs = Prove (qs, xs, l, t, subproofs, ((lfs, gfs), meth)) |
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val mk_step_gfs_lfs = curry (swap #> uncurry mk_step_lfs_gfs) |
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fun minimize_facts _ time min_facts [] = (time, min_facts) |
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| minimize_facts mk_step time min_facts (f :: facts) = |
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(case preplay_quietly (Time.+ (time, slack)) (mk_step (min_facts @ facts)) of |
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Played time => minimize_facts mk_step time min_facts facts |
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| _ => minimize_facts mk_step time (f :: min_facts) facts) |
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val (time, min_lfs) = minimize_facts (mk_step_gfs_lfs gfs) time [] lfs |
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val (time, min_gfs) = minimize_facts (mk_step_lfs_gfs min_lfs) time [] gfs |
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in |
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set_preplay_outcome l (Played time); mk_step_lfs_gfs min_lfs min_gfs |
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end |
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| _ => step (* don't touch steps that time out or fail *)) |
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fun postprocess_remove_unreferenced_steps postproc_step = |
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let |
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val add_lfs = fold (Ord_List.insert label_ord) |
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fun do_proof (Proof (fix, assms, steps)) = |
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let val (refed, steps) = do_steps steps in |
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(refed, Proof (fix, assms, steps)) |
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end |
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and do_steps [] = ([], []) |
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| do_steps steps = |
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(* the last step is always implicitly referenced *) |
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let val (steps, (refed, concl)) = split_last steps ||> do_refed_step in |
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fold_rev do_step steps (refed, [concl]) |
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end |
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and do_step step (refed, accu) = |
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(case label_of_step step of |
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NONE => (refed, step :: accu) |
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| SOME l => |
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if Ord_List.member label_ord refed l then |
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do_refed_step step |
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|>> Ord_List.union label_ord refed |
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||> (fn x => x :: accu) |
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else |
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(refed, accu)) |
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and do_refed_step step = step |> postproc_step |> do_refed_step' |
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and do_refed_step' (Let _) = raise Fail "Sledgehammer_Isar_Minimize" |
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| do_refed_step' (Prove (qs, xs, l, t, subproofs, ((lfs, gfs), m))) = |
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let |
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val (refed, subproofs) = |
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map do_proof subproofs |
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|> split_list |
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|>> Ord_List.unions label_ord |
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|>> add_lfs lfs |
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val step = Prove (qs, xs, l, t, subproofs, ((lfs, gfs), m)) |
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in |
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(refed, step) |
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end |
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in |
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snd o do_proof |
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end |
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end; |