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annotate src/Tactics.v @ 85:3746a2ded8da

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Tagless interpreter & cfold
author Adam Chlipala <adamc@hcoop.net>
date Mon, 06 Oct 2008 13:07:24 -0400
parents 522436ed6688
children fd505bcb5632
rev   line source
adamc@2 1 (* Copyright (c) 2008, Adam Chlipala
adamc@2 2 *
adamc@2 3 * This work is licensed under a
adamc@2 4 * Creative Commons Attribution-Noncommercial-No Derivative Works 3.0
adamc@2 5 * Unported License.
adamc@2 6 * The license text is available at:
adamc@2 7 * http://creativecommons.org/licenses/by-nc-nd/3.0/
adamc@2 8 *)
adamc@2 9
adamc@85 10 Require Import Eqdep List.
adamc@2 11
adamc@38 12 Require Omega.
adamc@38 13
adamc@59 14 Set Implicit Arguments.
adamc@59 15
adamc@2 16
adamc@66 17 Ltac inject H := injection H; clear H; intros; try subst.
adamc@51 18
adamc@59 19 Ltac appHyps f :=
adamc@50 20 match goal with
adamc@59 21 | [ H : _ |- _ ] => f H
adamc@59 22 end.
adamc@59 23
adamc@59 24 Ltac inList x ls :=
adamc@59 25 match ls with
adamc@59 26 | x => idtac
adamc@84 27 | (_, x) => idtac
adamc@59 28 | (?LS, _) => inList x LS
adamc@59 29 end.
adamc@59 30
adamc@59 31 Ltac app f ls :=
adamc@59 32 match ls with
adamc@59 33 | (?LS, ?X) => f X || app f LS || fail 1
adamc@59 34 | _ => f ls
adamc@59 35 end.
adamc@59 36
adamc@59 37 Ltac all f ls :=
adamc@59 38 match ls with
adamc@59 39 | (?LS, ?X) => f X; all f LS
adamc@59 40 | (_, _) => fail 1
adamc@59 41 | _ => f ls
adamc@59 42 end.
adamc@59 43
adamc@59 44 Ltac simplHyp invOne :=
adamc@59 45 match goal with
adamc@59 46 | [ H : ex _ |- _ ] => destruct H
adamc@59 47
adamc@51 48 | [ H : ?F _ = ?F _ |- _ ] => injection H;
adamc@51 49 match goal with
adamc@85 50 | [ |- _ = _ -> _ ] => try clear H; intros; try subst
adamc@51 51 end
adamc@51 52 | [ H : ?F _ _ = ?F _ _ |- _ ] => injection H;
adamc@51 53 match goal with
adamc@85 54 | [ |- _ = _ -> _ = _ -> _ ] => try clear H; intros; try subst
adamc@51 55 end
adamc@59 56
adamc@66 57 | [ H : ?F _ |- _ ] => inList F invOne; inversion H; [idtac]; clear H; try subst
adamc@66 58 | [ H : ?F _ _ |- _ ] => inList F invOne; inversion H; [idtac]; clear H; try subst
adamc@84 59 | [ H : ?F _ _ _ |- _ ] => inList F invOne; inversion H; [idtac]; clear H; try subst
adamc@84 60 | [ H : ?F _ _ _ _ |- _ ] => inList F invOne; inversion H; [idtac]; clear H; try subst
adamc@84 61 | [ H : ?F _ _ _ _ _ |- _ ] => inList F invOne; inversion H; [idtac]; clear H; try subst
adamc@50 62 end.
adamc@50 63
adamc@2 64 Ltac rewriteHyp :=
adamc@2 65 match goal with
adamc@2 66 | [ H : _ |- _ ] => rewrite H
adamc@2 67 end.
adamc@2 68
adamc@2 69 Ltac rewriterP := repeat (rewriteHyp; autorewrite with cpdt in *).
adamc@2 70
adamc@2 71 Ltac rewriter := autorewrite with cpdt in *; rewriterP.
adamc@2 72
adamc@2 73 Hint Rewrite app_ass : cpdt.
adamc@2 74
adamc@59 75 Definition done (T : Type) (x : T) := True.
adamc@2 76
adamc@59 77 Ltac inster e trace :=
adamc@59 78 match type of e with
adamc@59 79 | forall x : _, _ =>
adamc@59 80 match goal with
adamc@59 81 | [ H : _ |- _ ] =>
adamc@59 82 inster (e H) (trace, H)
adamc@59 83 | _ => fail 2
adamc@59 84 end
adamc@59 85 | _ =>
adamc@59 86 match trace with
adamc@59 87 | (_, _) =>
adamc@59 88 match goal with
adamc@59 89 | [ H : done (trace, _) |- _ ] => fail 1
adamc@59 90 | _ =>
adamc@59 91 let T := type of e in
adamc@59 92 match type of T with
adamc@59 93 | Prop =>
adamc@59 94 generalize e; intro;
adamc@59 95 assert (done (trace, tt)); [constructor | idtac]
adamc@59 96 | _ =>
adamc@59 97 all ltac:(fun X =>
adamc@59 98 match goal with
adamc@59 99 | [ H : done (_, X) |- _ ] => fail 1
adamc@59 100 | _ => idtac
adamc@59 101 end) trace;
adamc@59 102 let i := fresh "i" in (pose (i := e);
adamc@59 103 assert (done (trace, i)); [constructor | idtac])
adamc@59 104 end
adamc@59 105 end
adamc@59 106 end
adamc@59 107 end.
adamc@59 108
adamc@65 109 Ltac un_done :=
adamc@65 110 repeat match goal with
adamc@65 111 | [ H : done _ |- _ ] => clear H
adamc@65 112 end.
adamc@65 113
adamc@59 114 Ltac crush' lemmas invOne :=
adamc@66 115 let sintuition := simpl in *; intuition; try subst; repeat (simplHyp invOne; intuition; try subst); try congruence
adamc@59 116 in (sintuition; rewriter;
adamc@59 117 repeat ((app ltac:(fun L => inster L L) lemmas || appHyps ltac:(fun L => inster L L));
adamc@59 118 repeat (simplHyp invOne; intuition));
adamc@80 119 un_done; sintuition; try omega; try (elimtype False; omega)).
adamc@59 120
adamc@59 121 Ltac crush := crush' tt fail.
adamc@85 122
adamc@85 123 Theorem dep_destruct : forall (T : Type) (T' : T -> Type) x (v : T' x) (P : T' x -> Prop),
adamc@85 124 (forall x' (v' : T' x') (Heq : x' = x), P (match Heq in (_ = x) return (T' x) with
adamc@85 125 | refl_equal => v'
adamc@85 126 end))
adamc@85 127 -> P v.
adamc@85 128 intros.
adamc@85 129 generalize (H _ v (refl_equal _)); trivial.
adamc@85 130 Qed.
adamc@85 131
adamc@85 132 Ltac dep_destruct E :=
adamc@85 133 let doit A :=
adamc@85 134 let T := type of A in
adamc@85 135 generalize dependent E;
adamc@85 136 let e := fresh "e" in
adamc@85 137 intro e; pattern e;
adamc@85 138 apply (@dep_destruct T);
adamc@85 139 let x := fresh "x" with v := fresh "v" in
adamc@85 140 intros x v; destruct v; crush;
adamc@85 141 let bestEffort Heq E tac :=
adamc@85 142 repeat match goal with
adamc@85 143 | [ H : context[E] |- _ ] =>
adamc@85 144 match H with
adamc@85 145 | Heq => fail 1
adamc@85 146 | _ => generalize dependent H
adamc@85 147 end
adamc@85 148 end;
adamc@85 149 generalize Heq; tac Heq; clear Heq; intro Heq;
adamc@85 150 rewrite (UIP_refl _ _ Heq); intros in
adamc@85 151 repeat match goal with
adamc@85 152 | [ Heq : ?X = ?X |- _ ] =>
adamc@85 153 generalize (UIP_refl _ _ Heq); intro; subst; clear Heq
adamc@85 154 | [ Heq : ?E = _ |- _ ] => bestEffort Heq E ltac:(fun E => rewrite E)
adamc@85 155 | [ Heq : _ = ?E |- _ ] => bestEffort Heq E ltac:(fun E => rewrite <- E)
adamc@85 156 end
adamc@85 157 in match type of E with
adamc@85 158 | _ _ ?A => doit A
adamc@85 159 | _ ?A => doit A
adamc@85 160 end.